1. The indoor temperature expected by the user; 2. The length, width and height of the heating building, with or without room separation and other structural features; 3. What kind of structural material is the heating target (whether it is energy-saving, and what is the thermal insulation performance); 4. The characteristics of the area where the heating target is located, etc. Yuanda boiler is a designated manufacturer of boilers and pressure vessels approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China. , And fully passed the ISO9001: 2000 international quality system certification. With the accumulation of more than 60 years of manufacturing boilers, Yuanda boiler have formed gas-fired boilers, biomass boilers, coal-fired boilers, heat-conducting oil boilers and other varieties and specifications, and are widely used in chemical industry, food, winemaking, heating, papermaking, Printing and dyeing, rubber and other industries. At the same time, Yuanda Boiler has also established a four-full service system, including the whole-process installation guidance, 72-hour accompanying operation, customized boiler room and other services to effectively solve problems for users.

When the boiler is in normal operation, the automatic control system should meet the following conditions: The adjustment mechanism of the automatic control system is complete and easy to use; The boiler runs stably and the parameters are normal. When the automatic control system is put into operation, it is still necessary to monitor the changes of the boiler operating parameters, pay attention to the action of the automatic control system, and avoid adverse consequences caused by failure.

A boiler is a device that uses the heat energy (or other heat energy) released by the combustion of fuel to heat the working medium to certain parameters (temperature and pressure). If the boiler is to carry out complete combustion, then the conditions that it should meet are: there is a sufficient amount of air, and the mixture of fuel and air should be sufficient and thorough. In addition, in terms of oxidation time, it should be sufficient and sufficient, and in terms of furnace temperature, it should be in a suitable range. With the accumulation of more than 60 years of manufacturing boilers, Yuanda boilers have formed gas-fired boilers, biomass boilers, coal-fired boilers, heat-conducting oil boilers and other varieties and specifications, and are widely used in chemical industry, food, winemaking, heating, papermaking, Printing and dyeing, rubber and other industries. At the same time, Yuanda Boiler has also established a four-full service system, including the whole-process installation guidance, 72-hour accompanying operation, tailor-made boiler room and other services to effectively solve problems for users.

There is a corresponding calculation formula for the fuel consumption per hour of the oil-fired steam boiler, which is as follows: Fuel consumption per hour of oil-fired steam boiler = 3600*heat power/diesel calorific value/boiler efficiency Yuanda boiler is a designated manufacturer of boilers and pressure vessels approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China. , And fully passed the ISO9001: 2000 international quality system certification. With the accumulation of more than 60 years of manufacturing boilers, Yuanda boiler have formed gas-fired boilers, biomass boilers, coal-fired boilers, heat-conducting oil boilers and other varieties and specifications, and are widely used in chemical industry, food, winemaking, heating, papermaking, Printing and dyeing, rubber and other industries. At the same time, Yuanda Boiler has also established a four-full service system, including the whole-process installation guidance, 72-hour accompanying operation, customized boiler room and other services to effectively solve problems for users.

From a professional point of view, the inspection work before the steam boiler is used is an important work, which cannot be treated and carried out carelessly, and it is necessary to know the specific work content. In terms of work content, it is to check whether the components inside the boiler, such as pipes, pressure gauges and water level gauges, are intact and can be used normally. Also check that the water used in the boiler is softened and clean, free from impurities, dust and grease.

1. In order to increase the furnace temperature and facilitate the rapid overflow of volatiles of biomass fuel, special air supply facilities are installed on the installed biomass fuel boiler. Under the requirement of fully ensuring the oxygen supply of burning biomass "particles", Boiler inlet air volume can be adjusted. 2. When adding biomass fuel into the boiler furnace, in order to facilitate feeding into the hopper, a different method of coal feeding is adopted in the previous coal-fired boiler. The coal loading method of the coal-fired boiler is to directly pour the coal into the coal hopper by the coal loading machine or the coal conveying device, and enter the furnace through the coal gate and the chain grate for combustion. When biomass fuel passes through the coal hopper and the coal gate, because the biomass fuel particles are larger than coal, when passing through the coal gate, the collision resistance between the particles is larger, and the fuel particles are larger than the coal because of their volume, and enter the coal. The gate is easy to be blocked, so the thickness of the fuel layer passing through the coal gate in the fuel hopper is uneven, which is not conducive to combustion. Therefore, in order to solve this problem, the original open hopper used for the fuel hopper is made into a closed hopper, and a gate that can manually adjust the thickness of the fuel layer is directly installed in the hopper. The fuel passes through the underground storage hopper - the screw feeder - the conveying pipe - the closed hopper - the coal gate - the chain grate - the boiler. When passing through the gate that adjusts the thickness of the fuel layer, the fuel also encounters resistance to collision with each other, and the particle fuel volume is easily blocked by the coal gate. However, since the fuel is transported in the feeding pipe, it enters the hopper under the rotation of the external force of the screw s

1. Improve equipment management level, strive to reduce internal and external leakage of thermal equipment and systems, and reduce working fluid and heat loss. 2. Improve the economy of auxiliary machine operation, reduce various losses of auxiliary machine, and make it operate in the high-efficiency area as much as possible. Through tests, the reasonable operation modes of auxiliary machines and their related systems under different operating conditions are determined, and efforts are made to reduce the power consumption rate of the plant. 3. Strict chemical supervision of boiler operation, strict control of condensate water hardness, dissolved oxygen content of feed water, PH value of feed water, and quality of boiler water and steam to prevent corrosion, scaling and salt accumulation, which may lead to deterioration of boiler equipment operating conditions. 4. Improve the efficiency of the steam boiler, reduce the exhaust gas temperature of the steam boiler, the air leakage rate of the boiler, and the combustible content of fly ash, do a good job in the boiler combustion adjustment test of the pulverizing system, and formulate the operation cards of various working conditions as the operation of the operator. in accordance with. 5. Strengthen the measurement work of operation, so that the operation indicators of the boiler can be quantitatively analyzed, and provide a reliable basis for the economic operation of the steam boiler.

A boiler is a device that uses the heat energy (or other heat energy) released by the combustion of fuel to heat the working medium to certain parameters (temperature and pressure). The basic characteristics of the boiler, which are specifically: If it is a steam boiler, the capacity is expressed by evaporation, and the unit is t/h; if it is a hot water boiler, the capacity is expressed by the rated thermal power of the boiler, and the unit is MV. Temperature: On the steam boiler, it is only necessary to indicate the steam pressure; if it is a boiler producing superheated steam, the steam temperature at the outlet of the steam superheater must be indicated, that is, the superheated steam temperature. On the hot water boiler, there are rated outlet hot water temperature and rated inlet return water temperature. Thermal efficiency: It is an important indicator of boiler economic performance.

How to repair and maintain the oil-fired steam boiler, the specific work involved in this problem mainly includes: regularly cleaning the filter in front of the boiler burner, generally, it can be done once a week. And, do a good job in the water quality treatment of the boiler, as well as its sewage work, so as to prolong the service life of the boiler. With the accumulation of more than 60 years of manufacturing boilers, Yuanda boilers have formed various specifications such as oil-fired gas boilers, biomass boilers, coal-fired boilers, heat transfer oil boilers, etc., and are widely used in chemical industry, food, winemaking, heating, papermaking. , printing and dyeing, rubber and other industries. At the same time, Yuanda Boiler has also established a four-full service system, including the whole-process installation guidance, 72-hour accompanying operation, tailor-made boiler room and other services to effectively solve problems for users.

The valve is a common part in boiler equipment, and the boiler is inseparable from it, but it is also the most easily overlooked by people. But for special equipment such as steam boilers, a small problem may cause explosions or other dangers. Today we will talk about these valves in steam boilers. When our boiler manufacturers choose valves for boilers, they are determined by the medium, temperature, pressure, and working conditions used to avoid accidents due to improper use of boilers. For boilers with different working pressures, there should be separate steam pipes and water supply pipes. If a steam main pipe is used together, an automatic pressure relief device and a safety device to prevent overpressure on the low pressure side must be installed on the higher pressure steam pipe. When the water supply pressure difference does not exceed 20% of the maximum pressure, the boiler can be supplied with water from the main water supply system. Valves should be installed in convenient locations. On the steam-water shut-off valve and regulating valve of the steam pipeline and water supply pipeline, there should be obvious marks to indicate the direction of gas and water flow and the opening and closing direction of the valve. The arrow indicating the flow direction of the medium on the valve body is consistent with the flow direction, which not only prevents misoperation, but also facilitates use and maintenance. The feed water shut-off valve should be installed between the boiler (or economizer inlet header) and the feed water check valve, and connected to the feed water check valve. The main steam valve should be installed near the outlet of the drum or superheater header. Two gate valves shall be installed on each steam pipe connecting the boiler and the steam main pipe, and traps and valves leading to the atmosphere shall be installed between the gate valves, with an inner diameter of >1

1.25MPa, 12.5kg, which can represent the steam pressure of the boiler. What does this parameter mean in industrial boilers, let's take a look today, and learn the conversion method of steam boiler pressure by the way. 1. Definition of rated steam pressure of boiler The rated steam pressure refers to the steam boiler pressure at the outlet of the main gas valve of the boiler superheater that must be guaranteed for long-term continuous operation of the steam boiler under the specified boiler thermal efficiency, steam temperature, feed water temperature and rated steam temperature. pressure. Note: ①. The working pressure of the drum is greater than the rated pressure of the boiler. ②. In fact, the rated pressure refers to the working pressure, which is marked on the nameplate of the boiler. The actual working pressure is generally not allowed to exceed the rated pressure. 2. Conversion of rated steam pressure units As we often say "kg" of pressure, in fact, strictly speaking, it should be "kg force/square centimeter". If the acceleration of gravity is about 10, then 1kg force/square centimeter = 10 N/square centimeter = 10×10000 N/square meters = 100,000 Pascals Then 1MPa=1000000Pa=10 kilogram force/square centimeter, which is simply 10 kilograms, that is, 1Kg/cm2=0.1Mpa

In order to improve the service life of the heat transfer oil in the thermal oil boiler, we should do, specifically: (1) The heat transfer oil used should be matched with the thermal oil boiler. The transformed steam boiler or the thermal oil boiler with unqualified quality cannot be used, because this is very dangerous. (2) In the heating circulation system, a high-level tank and a low-level tank should be installed. Moreover, the heat transfer oil should be in a sealed state, especially at high temperatures, so as not to oxidize and deteriorate due to contact with the air. (3) If the heat transfer oil is used for the first time, the moisture and impurities in it must be removed, and it cannot be used directly without treatment. When it is injected into the thermal oil boiler, the circulating pump should be started first, and then the ignition operation should be carried out after it runs normally, so that it is not easy to cause problems.

It should be a hot water boiler. The specific reasons are as follows: If a steam boiler is used, then the hot steam must be replaced with hot water so that heating can be performed. Moreover, the use of steam boilers for heating has the following disadvantages, which are: Disadvantage 1: If the temperature of the heat exchanger used is too fast, it is easy to cause problems with the heat exchanger. In addition, if the pressure is too high, it is easy to cause problems such as bursting. Disadvantage 2: The surface temperature of the heat exchanger is very high and it is easy to be scalded. Disadvantage 3: If the heating effect of the boiler is not good, there will be problems such as water hammer or water hammer, as well as noise and damage. Disadvantage 4: In the thermal efficiency of the boiler, there will be heat loss, so the thermal efficiency will not be very high. Therefore, to sum up, it is better to use a hot water boiler. Therefore, except for some special circumstances, it is better to use a hot water boiler as much as possible.

Regardless of the tonnage of the steam boiler, the working principle of the boiler is basically the same. The working principle of the steam boiler is similar to that of the ground pot for boiling water. A device that incinerates and heats a steam boiler in a furnace to absorb the heat generated by fuel to convert water into steam with pressure and temperature. The boiler is divided into two parts: the boiler and the furnace. The boiler is a metal container used to hold water, and the furnace is the part where the fuel is burned. The water in the boiler absorbs the heat of the fuel burning in the furnace and turns into steam. The boiler body is the primary part of the steam boiler, which is composed of two parts: "pot" and "furnace". The "pot" is a metal container used to hold water. Its function is to absorb the heat energy released by the fuel after incineration, so that the water in the boiler is heated, and when it is heated to a certain parameter range, steam is formed. It is composed of flue gas preheater, steam drum, descending pipe, header pipe, water wall pipe, boiler drum and steam-water separator, as well as connecting steam pipes and valve surfaces, induced draft fan blower, etc. The "furnace" is the part where the fuel is incinerated for heat conversion. The demineralized water in the pot fully absorbs the heat generated by the fuel in the furnace to form steam.

The fully automatic oil-fired boiler is a quick-installed horizontal internal combustion three-return fire tube structure when in use. The whole equipment adopts its offset furnace liner wet-back arrangement. It is directly discharged into the atmosphere from the rear smoke chamber through the chimney. The fully automatic oil-fired boiler will be effectively equipped with its world-famous burner, and adopts advanced technologies such as automatic combustion proportional adjustment, automatic adjustment of feed water, program start, automatic operation, etc. Automatic protection functions such as pressure and flameout. The fully automatic oil-fired boiler has the characteristics of compact structure, safety and reliability, easy operation to a certain extent, less pollution, low noise and high efficiency. It is widely used in enterprises, hotels, hospitals, office buildings, civil buildings and other facilities. Industrial steam and living and heating . The combustion chamber of the fully automatic oil-fired boiler is composed of a large-diameter full-corrugated furnace. When in use, the combustion space is large and the fuel is completely burned. When in use, it effectively absorbs thermal expansion and has a large radiation heating surface. The total heating area of the boiler is sufficient, which can fully absorb the effective heat, the exhaust gas temperature is low, the heat loss is small, and the output is sufficient and the efficiency is high. The shell diameter of the fully automatic oil-fired boiler is large and the water capacity is large. It has strong adaptability to load changes and stable output during use. The return water system of the hot water boiler is scientifically arranged to increase the disturbance on the water side of the heating surface in the high temperature area. , to avoid the phenomenon of supercooled boiling in local areas, and completely solve the problem of cracks in the tub

The use of steam boiler heating is prone to the following problems: 1. The temperature rises too fast, the radiator suddenly cools and heats suddenly, and it is easy to leak water. Second, the pressure rise is too fast, the radiator is easy to cause metal fatigue, the life is reduced, and it is easy to cause the radiator to burst. 3. The surface temperature of the radiator is too high, which is easy to burn people. At the same time, it also causes bad indoor weather conditions. The indoor dust is decomposed above the radiator, causing the wall above the radiator to turn black. 4. If the heating effect of the heating pipe is not good before the steam supply, it will cause water hammer when the steam is sent. The water in the radiator will form a water hammer under the impact of the steam, impact the radiator and the pipeline, and make a loud noise. At night, it will affect the rest. , also damage the radiator and pipes. 5. The water in the boiler is heated to absorb the heat released by the fuel, and the water molecules become steam and absorb a part of the heat, resulting in energy waste. To sum up, steam heating is not economical, and there are many hidden dangers, so in recent years, the use of steam boilers as heat sources has become less and less.

The double horizontal drum water tube boiler is mainly composed of upper and lower horizontal drums, convection tube bundles, water wall tubes, downcomers and headers and other pressure components. The front part of the boiler is the furnace, and the water walls are arranged around the furnace; the upper and lower horizontal drums are located at the rear of the furnace, and the two drums are connected by curved water pipes. Combustion equipment mostly adopts chain grate, and some are pulverized coal furnace or boiling furnace, equipped with superheater, economizer and air preheater. The high-temperature flue gas flows from the upper part of the furnace through the heater and enters the convection flue, first downward and then upward in an S-shape, scouring the convection tube bundle horizontally, and then folded down into the tail flue after reaching the upper part. The heater is exhausted into the atmosphere by the induced draft fan and the chimney. The boiler evaporation is generally less than 20 tons/hour (t/h), and the working pressure is less than 2.5 megapascals (MPa). The water cycle of the double horizontal drum water tube boiler is divided into two parts: one part is the water circulation carried out by the convection tube bundle between the upper and lower horizontal drums; the other part is the water circulation carried out by the water wall tubes around the furnace. The soda-water mixture directly enters the upper drum, while the soda-water mixture in the water-cooled wall tubes on both sides needs to enter the upper drum through the upper header and the steam guide pipe. The water in each water-cooled wall pipe is supplied by the descending pipe drawn from the lower drum. The advantages of the double horizontal drum water tube boiler: reasonable and reliable structure, good load adaptability, high thermal efficiency, convenient operation and maintenance, and low labor intensity. Disadvantages: high volume, high consumption

Wet back boiler, if explained specifically, refer to the boiler's smoke transfer, which is inside the drum. In addition, the tube sheet, back plate and cylinder body of the smoke transfer chamber are all surrounded by boiler water, that is, they are immersed in the boiler water, so this type of boiler is called a wet back type. , or water back. Yuanda WNS series horizontal internal combustion full wet back oil and gas boilers, the flue gas flow is divided into two forms: two-pass and three-pass. The torch formed after the fuel is burned by the burner is filled in the full-wave furnace, and the radiant heat is transmitted through the furnace wall. This is the first return trip. The high-temperature flue gas generated by the combustion gathers in the return combustion chamber and turns to enter the second return pass, that is, the threaded flue tube bundle area. After convection heat exchange, the flue gas temperature gradually decreases and then reaches the front smoke box. The second return boiler flue gas flows from the front smoke box. Out of the boiler body, it enters the economizer and condenser set on the top of the furnace. The three-pass boiler flue gas turns from the front smoke box to enter the third return pass, that is, the light tube bundle area, and then enters the economizer and condenser through the rear smoke box, and finally flows into the chimney , into the atmosphere. With excellent performance advantages, Yuanda WNS series gas boilers are widely used in chemical, food, winemaking, heating, papermaking, printing and dyeing, rubber and other industries.

The chain grate boiler is a layer-fired boiler with a high degree of mechanization. Its grate is similar to the crawler of the chain, so this kind of boiler is called a chain grate boiler. Moreover, it is a front-mounted boiler, and the combustion process of coal is completed on the move. The advantages of this type of boiler are stable combustion conditions, high thermal efficiency and simple and convenient operation, and in addition, its smoke and dust emission concentration is low. However, it should be noted that coal with high moisture content, high ash content and strong coking property is not suitable for combustion in this type of boiler. The coal-fired chain grate boilers produced by Yuanda Boiler can be divided into two series: SZL series double drum chain grate boilers and DZL series single drum chain grate boilers. Yuanda coal-fired boilers have a wide range of fuel applicability, and can be applied to various coal types such as bituminous coal, anthracite, lean coal, lignite, etc. At the same time, special grate pieces are selected to ensure smooth operation of the grate; the combustion-supporting air system (base) adopts independent sub-silo and Scientific sealing structure; reasonable air regulating device to achieve precise air distribution and improve combustion efficiency.

With the accumulation of more than 60 years of manufacturing boilers, Yuanda boiler have formed more than 400 varieties and specifications, such as gas boilers, biomass boilers, coal-fired boilers, thermal oil boilers, etc., and are widely used in chemical industry, food, winemaking, heating, papermaking. , printing and dyeing, rubber and other industries. At the same time, Yuanda Boiler has also established a four-full service system, striving to improve user experience in three aspects: pre-sale selection, in-sale consultation, and after-sale service. In view of the points that need to be paid attention to in the process of boiler selection, Yuanda Boiler has made the following arrangements: 1. How much heat of steam and hot water is required by the enterprise itself in the production process or in heating and heating. 2. Boiler steam parameters or hot water parameters. 3. Selection of industrial boiler furnace type. 4. Fuel used in industrial boilers. 5. Others such as external dimensions, load changes, etc. If you encounter any problems, please consult Yuanda Boiler online, we will serve you wholeheartedly.

1. Fuel combustion and heat release process The coal is fed into the boiler, mixed with the hot fluidized material in the furnace, absorbs heat, and mixes with the air to burn and release heat. The wall and other heating surfaces arranged in the furnace dissipate heat. After the coarse particles are brought into the suspension area by the rising flue gas, they are continuously decelerated and deviated from the main air flow under the action of gravity and other external forces, and finally form a particle flow that descends from the wall. The gas-solid mixture brought out of the furnace enters the separator at the rear of the furnace, and most of the solid particles are separated and sent back to the furnace through the return material for cyclic combustion. The ultrafine particles that have not been separated enter the flue with the flue gas, and further exothermic and cool the superheater, economizer, and air preheater. atmosphere. The air required for fuel combustion, fluidization and return is supplied by the primary fan, the secondary fan and the return fan, and the flue gas generated by the combustion is drawn out of the boiler by the induced draft fan. 2. The process of water circulation, heat absorption and generation of qualified steam The feed water is boosted by the feed pump and then sent to the economizer. After being heated by the flue gas in the economizer, it is sent to the steam drum, mixed with the boiler water in the steam drum, and then enters the water wall along the down pipe through the lower header. The heat of the high temperature flame and flue gas in the furnace is absorbed in the water cooling wall, and part of the water evaporates to form a soda-water mixture that flows into the steam drum. The steam-water mixture is separated from the steam-water in the steam-water separation device in the steam drum, and the separated saturated steam enters the superheater, which is further he

No matter what kind of equipment, accessories are essential. As a leading enterprise of industrial boilers, Yuanda boiler is not only responsible for providing users with high-quality boilers, but also boiler accessories are one of the main marketing services provided by Yuanda boilers, because even boilers with minimal wear and tear need to be replaced within a certain period of time. Individual accessories to ensure the safe and stable operation of the boiler. Boiler accessories mainly include: 1. Soda system: Flanges, pipe fittings, bolts, gaskets, valves, meters, water treatment accessories, water pump accessories, welding electrodes, oxygen acetylene, resins, salts, descaling agents. 2. Smoke and air system: Chimney, flue, dust collector accessories, drum, induced draft fan accessories, electrical materials, economizer accessories. 3. Combustion system: Coal loader, slag remover accessories, grate accessories, speed control box accessories. 4. Control system: Electrical materials, switches, meters Yuanda Boiler will solve your problems with the whole-process, whole-hearted, all-weather and all-round service standards. At the same time, whether it is telephone or online consultation, Yuananda Boiler will give professional guidance to answer questions in a timely manner, so that you can be safe and worry-free.

"Hard water" refers to water that contains more, soluble, calcium and magnesium compounds. Whether buying a hot water boiler or a steam boiler, the water entering the boiler must be water-treated soft water. Why is the boiler's water requirement so high? Ordinary water is put into the boiler, and it is very easy to scale. Because the steam is continuously evaporated, the concentration of calcium, magnesium and impurities in the boiler water will be very high, which is 30-50 times that of natural water. There can be 1-2mm scaling. The scale damage greatly threatens the safety of the boiler, and in severe cases, it can cause the boiler to burst! After the scale appears, the thermal conductivity is only less than 0.5% of that of the metal. After the boiler scale appears, if you want to achieve the thermal efficiency without scale, you can only increase the temperature of the heating surface inside the boiler. For example: when the furnace wall temperature is 250 ℃, When 1mm of fouling occurs, to achieve the same thermal efficiency, the wall temperature must be increased to 650°C. At this time, the heat absorption rate is extremely low, the energy consumption is increased, and the fuel cost is doubled. It can be seen that, no matter from the point of view of safety or economy, boiler water must be used in accordance with the usage specifications and can only be used after water treatment. Yuanda Boiler is a designated manufacturer of boilers and pressure vessels approved by the General Administration of Quality Supervision, Inspection and Quarantine of China. With the accumulation of more than 60 years of manufacturing boilers, Yuanda boilers have formed more than 400 varieties and specifications such as gas boilers, biomass boilers, coal-fired boilers, heat transfer oil boilers, etc., and are widely used in chemical industry, food, winemaking, heating, papermaking. , printing and dyeing, rubb

Water tube boiler refers to an industrial boiler in which a combustion chamber and a heating surface are set outside the drum, causing water and steam to flow in the tube. The structure is more complicated, the soda system mainly includes drum (drum), header, water wall, convection pipe, economizer and superheater, etc.; the combustion system mainly includes burner, furnace and flue, air preheater, etc. . At present, the water-tube boilers produced by Yuanda are the most popular SZS gas-fired boilers and SZL series biomass boilers. Compared with fire-tube boilers, they do not have large-diameter drums in structure, and the elastic curved water pipes replace the straight smoke pipes. Not only saves metal, but also creates conditions for improving boiler capacity and steam parameters. The specific advantages of water tube boilers are: 1. The furnace of the water-tube boiler is placed outside the cylinder, and the volume of the furnace can be large or small, which can meet the requirements of combustion and increased evaporation. 2. The drum of the water-tube boiler is generally not directly heated, and the tube containing the water vapor is placed in the furnace and the flue as the heating surface, and the heat transfer performance and safety performance are significantly improved. 3. The water preheating, soda water and steam superheating of the water tube boiler are completed in the heating surface economizer, water wall and convection tube bundle, and superheater. 4. The water vapor system, combustion system and auxiliary system of the water-tube boiler are relatively complex, but the structure of a single pressure-bearing component of the water-tube boiler is relatively simple. 5. Because the preheating of water, the superheating of soda water and steam are all completed in the tube, the scaling of the tube is difficult to remove, so the water tube boiler has higher requireme