Combustion system for washing powder preparation process and control method thereof

Abstract

The present application relates to a combustion system for a washing powder preparation process and a control method thereof, and relates to the technical field of burners, which includes a fuel combustion structure, a feeding structure and a slag discharge structure, wherein the feeding structure and the slag discharge structure are respectively arranged at the two ends of the fuel combustion structure, and the combustion system also includes a gas combustion structure, a water cooling structure, a steam generating structure, a gas mixing structure, a monitoring mechanism and a regulating mechanism, wherein the fuel combustion structure is connected to the gas combustion structure, and the gas combustion structure is respectively connected to the steam generating structure and the gas mixing structure, the monitoring mechanism is used to monitor the temperature and pressure of the combustion system, the regulating mechanism is used to adjust the air intake, the hot air flux size, and the air outlet, the water cooling structure is arranged inside the fuel combustion structure, and the water cooling structure is externally connected to a water storage tank. The present application has the effect of more complete combustion of biomass powder and environmentally friendly emissions under negative pressure environment, and can provide large quantities of hot air, hot water, and steam to washing powder manufacturers at low cost.

Description

Technical Field

[0001] The present application relates to the technical field of biomass powder burners, and in particular to a combustion system for a washing powder preparation process and a control method thereof. Background Art

[0002] In the preparation process of washing powder, there are different requirements such as hot air, steam, and hot water. Hot air can be used to dehydrate washing powder into powder, and hot water can be used to heat in a water bath to accelerate the dissolution of some washing powder ingredients. In the prior art, hot air, steam, and hot water are usually obtained by heating in different ways. According to the different demand and required temperature, the heating method, heating time, heating scale, etc. are all different.

[0003] In the dehydration of washing powder, the hot air required by current technology is usually achieved by burning natural gas or electric heating. Electric heating may seem to be the most environmentally friendly in washing powder production plants, but the electricity itself will cause pollution, and its electricity consumption is a kind of energy consumption. Moreover, the power of electric heating equipment is relatively small. A single washing powder drying tower needs to be equipped with an electric heating device. The washing powder drying tower is divided into different specifications according to the production volume, such as 8M drying tower, 4M drying tower, etc. The higher the drying tower, the greater the power of the electric heating equipment required, so the production cost invested is also higher. Production enterprises are also involved in the high electricity price and gradient electricity price of industrial electricity. Therefore, electric heating is not so suitable for washing powder production enterprises. Burning natural gas is relatively environmentally friendly compared to the most traditional burning of coal, but natural gas combustion equipment, like electric heating equipment, has a series of problems extended by relatively small power. Washing powder drying towers are usually distributed in the factory area. For example, the installation of natural gas combustion equipment requires the laying of natural gas pipelines. Natural gas itself is flammable and explosive, and the washing powder drying tower contains washing powder powder. Natural gas and washing powder powder have explosion hazards. Furthermore, if the natural gas open flame is set at a position close to the washing powder drying tower, it has explosion hazards. If the natural gas open flame is set at a position far away from the washing powder drying tower, it will relatively bring more natural gas costs due to heat loss, and the hot air supply will also be relatively reduced, which is more in line with the small-scale hot air demand. At present, there are also some new fuels with very low prices on the market, such as biomass powder. For enterprises, the low fuel cost is very suitable for large-scale continuous combustion, thereby generating more and continuous hot air, but the disadvantage of biomass powder combustion is that it is easy to produce smoke and release some harmful gases. This is superimposed on the environmental risks of the washing powder production line itself, which can easily cause such enterprises to fall into the crisis of substandard environmental emissions.

[0004] Steam and hot water heating methods also have the above-mentioned problems like hot air.

[0005] In view of the above-mentioned related technologies, there is an urgent need for a combustion system that can generate hot air, steam and hot water, and achieve harmless combustion and zero emissions, and also achieve that the generated hot air, hot water and steam can simultaneously meet the large-scale, continuous and low-cost requirements of large-scale production. Summary of the invention

[0006] In order to solve the above technical problems, the present application provides a combustion system for a washing powder preparation process and a control method thereof.

[0007] The present application provides a combustion system for a washing powder preparation process and a control method thereof, which adopts the following technical solutions:

[0008] A combustion system for a washing powder preparation process comprises a fuel combustion structure, a feeding structure and a slag discharge structure, wherein the feeding structure and the slag discharge structure are respectively arranged at two ends of the fuel combustion structure, and the fuel combustion structure is used for the combustion of biomass powder. The combustion system also comprises a gas combustion structure, a water cooling structure, a steam generating structure, a gas mixing structure, a monitoring mechanism and a regulating mechanism, wherein the gas combustion structure is used for the combustion of combustible gas, one side of the fuel combustion structure is connected with one end of the gas combustion structure, and the other end of the gas combustion structure is respectively connected with the steam generating structure and the gas mixing structure, the monitoring mechanism is used for monitoring the temperature and pressure in the fuel combustion structure, the gas combustion structure, the gas mixing structure and the steam generating structure, the regulating mechanism is used for adjusting the air intake in the fuel combustion structure, the hot air flux of the gas combustion structure and the gas mixing structure, the air intake in the gas mixing structure and the air outlet in the gas mixing structure, the water cooling structure is arranged inside the fuel combustion structure, and the water cooling structure is externally connected to a water storage tank, the steam generating structure provides the steam required for the washing powder preparation process, and the monitoring mechanism is used for monitoring the pressure and temperature in the fuel combustion structure, the gas combustion structure, the steam generating structure and the gas mixing structure.

[0009] By adopting the above technical solution, harmless and zero-emission combustion of biomass powder can be achieved, and the generated combustible gas is fully burned in the gas combustion structure, providing the required large-scale, continuous, and low-cost hot air supply for washing powder manufacturers. The steam generation structure matched with the combustion system also provides large-scale, continuous, and low-cost steam supply for washing powder manufacturers. The water cooling structure can not only meet the cooling protection function inside the fuel combustion structure, but also provide large-scale, continuous, and low-cost hot water supply for washing powder manufacturers. That is, the combustion system can simultaneously provide large-scale, continuous, and low-cost hot air, steam, and hot water for washing powder manufacturers, and the harmless and zero-emission environmental protection effects are superimposed on the above comprehensive effects, further reducing the environmental protection risks of washing powder manufacturers. The gas mixing structure is used to control the temperature and air volume of the hot air finally produced by the combustion system. The steam generating structure can also control the temperature and amount of the produced steam. The monitoring mechanism and the control mechanism are the technical guarantee for the combustion system to achieve harmless and zero-emission combustion. The fuel combustion structure and the gas combustion structure are controlled to be in a slightly negative pressure state to avoid combustion overflow, ensure that the fuel burns stably in the combustion area, the flame is uniform and white, the combustion is sufficient, the amount of ash raised is reduced, and coking is reduced.

[0010] Optionally, the fuel combustion structure includes a burner chamber, a conveyor belt, a residue trough, a combustible gas outlet, a conveying power device, a combustible gas exhaust structure, a feed gate and a ash cleaning bin. The surrounding wall structure of the burner chamber is made of refractory bricks, and the outside of the refractory bricks is evenly wrapped with insulation material. A metal shell is arranged on the outside of the insulation material. Two air inlets are respectively opened on one side of the fuel combustion structure opposite to the gas combustion structure, one of which is close to the feed structure, and the other is close to the slag discharge structure. Both air inlets are located above the level of the conveyor belt. The conveyor belt is horizontally arranged in the burner chamber, one end of the conveyor belt corresponds to the feed of the feed structure, and the other end of the conveyor belt corresponds to the slag discharge structure. A residue trough is arranged at one end of the burner chamber close to the slag discharge structure, and the length direction of the residue trough is parallel to the width direction of the conveyor belt. The residue trough is arranged at one end of the conveyor belt, and the vertical bottom of the residue trough is aligned with the slag discharge structure. The structure is connected, the combustible gas port is opened on the side of the burner chamber close to the gas combustion structure, the burner chamber transports the combustible gas to the gas combustion structure through the combustible gas port, the combustible gas exhaust-aiding structure is arranged on the top of the burner chamber, the combustible gas port and the combustible gas exhaust-aiding structure are arranged in sequence in the conveying direction of the conveyor belt, the fuel combustion structure is also provided with a feed gate at the inlet end, and the feed gate is cooled by a water cooling structure inside, the feed gate controls the discharge amount and speed of the feed structure to the conveyor belt, and adjusts the thickness of the fuel spread on the conveyor belt, the fuel combustion structure is also provided with a pressure sensor and a temperature sensor for detection, a cleaning bin is arranged on one end of the fuel combustion structure close to the feed structure, the cleaning bin is communicated with the burner chamber, the conveyor belt extends into the cleaning bin, and is connected to the conveying power equipment through a reducer and a drive shaft in the cleaning bin, and the conveying power equipment is arranged on the side of the fuel combustion structure away from the gas combustion structure.

[0011] By adopting the above technical solution, the surrounding wall structure of the burner chamber can provide sufficient insulation for the combustion of biomass powder (hereinafter referred to as fuel) in the fuel combustion structure, stabilize the internal combustion temperature, and optimize the combustion effect. Another function is to provide sufficient temperature for the combustible gas after combustion to ensure the full combustion of the combustible gas in the gas combustion structure. Another function is to provide sufficient temperature for the hot air discharged from the gas combustion structure. The horizontally arranged conveyor belt is transported from the inlet end to the outlet end, that is, the incoming biomass powder is burned flat on the conveyor belt. The uniform speed of the conveyor belt slowly displaces the burning fuel from the inlet end, and the combustible gas generated by the combustion smoothly enters the gas combustion structure through the combustible gas port under the action of negative pressure. The overall structure and setting position of the combustible gas exhaust structure are to form a solid obstacle avoidance after the combustible gas port, so that the combustible gas can be discharged through the combustible gas port. The fuel combustion structure also adds a feed gate at the inlet end. The opening and closing degree of the feed gate can well adjust the laying thickness of the biomass powder on the conveyor belt, ensuring the sufficiency of combustion while maintaining a good temperature and the position where the combustion is completed. Two air inlets are respectively set at both ends of the conveyor belt. The air intake of the air inlets is to adjust the temperature inside the fuel combustion structure, to adjust the air pressure at the front and rear ends of the fuel combustion structure, and to supply the air required for combustion in the fuel combustion structure to ensure the full combustion of the biomass powder in the fuel combustion structure. Avoid uneven air pressure at the front and rear ends of the gas combustion structure, which may cause smoke at one end. The addition of a cleaning bin can facilitate the cleaning of the conveyor belt and the observation of one end of the conveyor belt. The conveyor belt extends into the cleaning bin and is connected to the conveying power equipment through a reducer and a drive shaft in the cleaning bin. It can provide a sufficient non-combustion area for the conveyor belt, facilitate the cooling of the conveyor belt, and protect the connection between the conveyor belt and the reducer and the drive shaft.

[0012] Optionally, the water cooling structure includes a water inlet pipe, a water outlet pipe, a water valve, a cooling plate, a water inlet branch pipe and a water outlet branch pipe. The water outlet end of the water inlet pipe is respectively connected to one end of the cooling plate and one end of the feed gate in parallel through two water inlet branches, and the input end of the water outlet pipe is respectively connected to the other end of the cooling plate and the other end of the feed gate through the water outlet branch pipe in parallel. A water valve is arranged on the water inlet pipe. The length direction of the cooling plate is consistent with the conveying direction of the conveyor belt, and a cooling plate is respectively arranged on both sides of the width of the conveyor belt.

[0013] By adopting the above technical solution, the cold water inside the feed gate can effectively cool down the side of the feed gate facing the burner chamber, thereby extending the service life of the feed gate. The cooling plate can isolate the flame on the conveyor belt from the transmission chains on both sides of the conveyor belt to a certain extent. Passing cooling water into the cooling plate can better protect the transmission chains on both sides of the conveyor belt. The hot water at the outlet of the water cooling structure can be directly transported to the downstream production link, or collected and stored in a water storage tank.

[0014] Optionally, the control mechanism includes a fan, an air inlet valve, a cold air fan, a vent valve and a cold air regulating valve, the fan is arranged on the outside of the fuel combustion structure, the outlet of the fan is connected to two air outlet pipes in parallel, a single air outlet pipe is connected to a single air inlet through an air inlet valve, the cold air fan is arranged on the outside of the air mixing structure, the cold air fan inputs cold air to the air mixing structure, the cold air regulating valve adjusts the air volume of the cold air fan input to the air mixing structure, and the vent valve is arranged on the top of the air mixing structure, for controlling the opening and closing of the hot air released into the atmosphere.

[0015] By adopting the above technical solution, the cooperation between the fan and the air inlet valve is to ensure that there is sufficient oxygen for fuel combustion and the sufficiency of fuel combustion. The role of the air inlet valve is to adjust the air intake volume, thereby controlling the combustion temperature in the burner chamber. The position design of the two air inlet valves is to adjust the position where the fuel combustion is completed on the conveyor belt, that is, to ensure that the fuel combustion process on the conveyor belt is completed before the combustible gas exhaust structure, so that the combustible gas can enter the gas combustion structure well. The cold air fan and the cold air regulating valve are used to adjust and control the hot air temperature in the gas mixing structure, and the vent valve is used to adjust the negative pressure environment of the entire combustion system.

[0016] Optionally, the combustible gas exhaust-aiding structure includes a front arch, a middle arch and a rear arch, and the front arch, the middle arch and the rear arch are arranged in sequence in the conveying direction of the conveyor belt. The front arch, the middle arch and the rear arch all start to rise from the same side wall of the combustible gas outlet in the burner chamber along the top of the burner chamber. The arch height of the middle arch is higher than that of the front arch, and the arch height of the rear arch is higher than that of the middle arch. A combustion arch is also added to the top of the inner wall of the fuel combustion structure. The combustion arch is arranged at one end close to the feeding structure, and the combustible gas exhaust-aiding structure is arranged at one end close to the slag discharge structure. The combustion arch and the combustible gas exhaust-aiding structure are used in combination inside the fuel combustion structure, and the combustible gas outlet is located between the combustion arch and the combustible gas exhaust-aiding structure.

[0017] By adopting the above technical solution, the arch heights of the front arch, the middle arch and the rear arch are set to form a barrier that is lower as it gets closer to the slag discharge structure, effectively blocking the combustible gas from reaching the slag discharge structure, allowing the combustible gas to smoothly enter the gas combustion structure from the combustible gas port. The combustible gas port is located between the combustion arch and the combustible gas exhaust structure, and the combustible gas is blocked between the combustion arch and the combustible gas exhaust structure, further ensuring that the combustible gas enters the gas combustion structure from the combustible gas port.

[0018] Optionally, the gas combustion structure includes a plurality of gas combustion chambers connected in series, and two adjacent gas combustion chambers are connected by gas through holes, and two adjacent gas through holes are staggered. A cleaning door is provided on a single gas combustion chamber, and the inner wall, bottom and top of the single gas combustion chamber are all made of refractory fire bricks, and the outside of the fire bricks is evenly wrapped with thermal insulation material, and a metal shell is provided on the outside of the thermal insulation material. The gas combustion structure is connected to the steam generating structure through a first high-temperature gate valve, and the gas combustion structure is connected to the gas mixing structure through a second high-temperature gate valve, and the combustible gas outlet is located in the center of the width direction of the side wall of the gas combustion chamber.

[0019] By adopting the above technical scheme, multiple gas combustion chambers connected in series ensure that the entering combustible gas can achieve multi-stage re-combustion, thereby ensuring the completeness of its combustion. The staggered arrangement between two adjacent gas through holes can increase the residence time of the combustible gas in multiple gas combustion chambers connected in series, further ensuring the combustion duration and making the combustion more complete. The layer structure of the gas combustion chamber has the same function as the layer structure of the burner chamber. The first high-temperature gate valve and the second high-temperature gate valve control the flow between the steam generating structure and the gas combustion chamber, and between the gas mixing structure and the gas combustion chamber by controlling the opening, thereby adjusting the micro-negative pressure environment in the gas combustion chamber and the burner chamber. The combustible gas outlet is located in the center position in the width direction of the gas combustion chamber side wall, so that the combustible gas can be more fully dispersed into the adjacent gas combustion chambers, thereby increasing the combustion area and combustion completeness of the combustible gas in the adjacent gas combustion chambers.

[0020] Optionally, the air mixing structure includes an air mixing chamber, an air mixing cold air duct, an air mixing hot air main pipe, an exhaust chimney and a hot air duct. The air mixing cold air duct is connected to one of the sides of the air mixing chamber, and the air mixing hot air main pipe is connected to the top of the air mixing chamber. The air outlet end of the air mixing hot air main pipe is connected in parallel with the exhaust chimney and the hot air duct, and the hot air duct transports the hot air to the next washing powder production process.

[0021] By adopting the above technical solution, the main function of the gas mixing chamber is to adjust the hot air coming out of the gas combustion chamber to meet the input temperature requirements of the hot air pipe, and the cold air pipe of the gas mixing chamber is a means of regulating the temperature of the cold air input. The exhaust chimney is to release excess hot air and play a certain role in regulating the micro-negative pressure in the gas combustion chamber and the burner chamber.

[0022] Optionally, the monitoring mechanism includes a pressure sensor and a temperature sensor, and the pressure sensor and the temperature sensor are respectively provided on the fuel combustion structure, the gas mixing structure, the gas combustion structure and the steam generating structure.

[0023] By adopting the above technical scheme, pressure sensors and temperature sensors are respectively provided on the fuel combustion structure, the gas mixing structure, the gas combustion structure and the steam generating structure, which can effectively and real-time detect their temperature and pressure, facilitate the start-up and shutdown of other control mechanisms, and ultimately work together to adjust the micro-negative pressure in the gas combustion chamber and the burner chamber, thereby ensuring the temperature of the hot air, the adequacy of combustion, etc.

[0024] Optionally, one end of the slag discharger of the slag discharge structure is connected to the fuel combustion structure water seal, and the fuel height in the feeding structure is maintained at not less than 50 cm.

[0025] By adopting the above technical scheme, the water seal connection is used to ensure the sealed connection between the slag discharge structure and the burner chamber, so as to realize a micro-negative pressure environment in the burner chamber near one end of the slag discharge structure. The fuel height in the feed structure is kept not less than 50 cm to ensure that the feed structure and the burner chamber are sealed and connected, so as to realize a micro-negative pressure environment in the burner chamber near one end of the feed structure.

[0026] A method for controlling a combustion system for a washing powder preparation process comprises the following steps:

[0027] 1) Make preparations before combustion: open the water valve to fill the water cooling structure with cold water; run the unloaded conveyor belt to ensure that the conveyor belt is straight and does not deviate; open the vent valve, the first high-temperature gate valve, and the second high-temperature gate valve; fill the biomass powder in the feeding structure and ensure that the water content of the biomass powder is 8-12%, and select medium-weak cohesive biomass powder;

[0028] 2) Ignition and baking of the burner chamber: When the temperature of the burner chamber is below 300°C, it is baked with firewood, and when it is above 300°C, it is baked with biomass powder. The temperature is detected by the temperature sensor in the burner chamber. The pressure is observed by the pressure sensor in the burner chamber, and the opening of the first high-temperature gate valve and the second high-temperature gate valve is adjusted to maintain a slight negative pressure in the burner chamber.

[0029] 2a: First baking of the burner chamber: 0-150℃ baking for 36 hours, 150℃ insulation for 60 hours, 150-400℃ rising by 3℃ per hour, 400℃ insulation for 24 hours, 400-600℃ rising by 4℃ per hour, 600℃ insulation for 48 hours, 600-800℃ rising by 6℃ per hour, 800-1000℃ rising by 8℃ per hour;

[0030] 2b: Late-stage baking of the burner chamber: 0-150℃ baking for 8 hours, 150℃ insulation for 8 hours, 150-600℃ rising by 15℃ per hour, 600℃ insulation for 8 hours, 600-800℃ rising by 20℃ per hour, and above 800℃ rising by 30℃ per hour;

[0031] 3) When the temperature of the burner chamber reaches 300°C, start the slag discharger, adjust the conveyor belt and fan speed according to the burner chamber temperature and time requirements; adjust the thickness of the conveyor belt upper layer to 120-220cm through the feed gate; open the cold air regulating valve of the mixing chamber, introduce cold air, and adjust the temperature of the exhaust chimney to the normal emission range;

[0032] 4) When the temperature in the gas combustion chamber near the mixing chamber rises to 800°C, close the vent valve of the exhaust chimney, and adjust the opening degree of the cold air regulating valve on the mixing chamber so that the temperature in the hot air pipe reaches the temperature required for washing powder production, and adjust the opening degree of the first high-temperature gate valve and the second high-temperature gate valve so that a slight negative pressure is maintained in the burner chamber; and continuously control the temperature in the gas combustion chamber near the mixing chamber to be stable at 900°C; the combustion area of ​​the biomass powder on the conveyor belt is controlled to burn out after the combustion arch and 30cm before the rear arch;

[0033] 4a: If the temperature in the hot air pipe exceeds the temperature required for production, the rotation speed of the conveyor belt and the air intake of the fan to the burner chamber can be reduced; or the cold air regulating valve on the mixing chamber can be opened;

[0034] 4b: If the temperature in the hot air pipe is lower than the temperature required for production, the rotation speed of the conveyor belt and the air intake of the fan to the burner chamber can be increased; or the cold air regulating valve on the mixing chamber can be closed;

[0035] 4c: If the combustion is intense at the front end near the combustion arch, but is completely burned out before reaching the rear arch combustion area, adjust the opening of the two air inlet valves, close the air inlet valve near the feeding structure, and open the air inlet valve near the slag discharge structure, so that the combustion of biomass powder at the front end of the conveyor belt in the conveying direction is weakened, and the biomass powder is fully burned in the combustion area.

[0036] In summary, the present application includes at least one of the following beneficial technical effects:

[0037] 1. By adopting the above technical solution, harmless and zero-emission combustion of biomass powder is achieved, and the generated combustible gas is fully burned in the gas combustion structure, providing the required large-scale, continuous, and low-cost hot air supply for washing powder manufacturers. The steam generation structure matched with the combustion system also provides large-scale, continuous, and low-cost steam supply for washing powder manufacturers. The water cooling structure can not only meet the cooling protection function inside the fuel combustion structure, but also provide large-scale, continuous, and low-cost hot water supply for washing powder manufacturers. That is, the combustion system can simultaneously provide large-scale, continuous, and low-cost hot air, steam, and hot water for washing powder manufacturers, and the harmless and zero-emission environmental protection effects are superimposed on the above comprehensive effects, further reducing the environmental protection risks of washing powder manufacturers.

[0038] 2. The gas mixing structure is used to control the temperature and air volume of the hot air finally produced by the combustion system. The steam generating structure can also control the temperature and amount of the produced steam. The monitoring mechanism and the control mechanism are the technical guarantee for the combustion system to achieve harmless and zero-emission combustion. The fuel combustion structure and the gas combustion structure are controlled to be in a slightly negative pressure state to avoid combustion overflow, ensure that the fuel burns stably in the combustion area, the flame is uniform and white, the combustion is sufficient, the amount of ash raised is reduced, and coking is reduced.

[0039] 3. The surrounding wall structure of the burner chamber can provide sufficient insulation for the combustion of biomass powder in the fuel combustion structure, stabilize the internal combustion temperature, and optimize the combustion effect. Another function is to provide sufficient temperature for the combustible gas after combustion to ensure the full combustion of the combustible gas in the gas combustion structure. Another function is to provide sufficient temperature for the hot air discharged from the gas combustion structure.

[0040] 4. The horizontally arranged conveyor belt transports from the inlet end to the outlet end, that is, the incoming biomass powder is burned flat on the conveyor belt. The uniform speed of the conveyor belt slowly displaces the burning fuel from the inlet end, and the combustible gas produced by the combustion smoothly enters the gas combustion structure through the combustible gas port under the action of negative pressure.

[0041] 5. The overall structure and setting position of the combustible gas exhaust auxiliary structure are to form a solid obstacle behind the combustible gas outlet so that the combustible gas can be discharged through the combustible gas outlet.

[0042] 6. A feed gate is also added to the inlet end of the fuel combustion structure. The opening and closing degree of the feed gate can well adjust the thickness of the biomass powder on the conveyor belt, ensuring the completeness of combustion while maintaining a good temperature and the position where the combustion is completed.

[0043] 7. Two air inlets are respectively set at both ends of the conveyor belt. The air intake of the air inlets is to adjust the temperature inside the fuel combustion structure, to adjust the air pressure at the front and rear ends of the fuel combustion structure, and to supply the air required for combustion in the fuel combustion structure to ensure the full combustion of the biomass powder in the fuel combustion structure. Avoid uneven air pressure at the front and rear ends of the gas combustion structure, which may cause smoke at one end. The addition of a cleaning bin can facilitate the cleaning of the conveyor belt and the observation of one end of the conveyor belt. The conveyor belt extends into the cleaning bin and is connected to the conveying power equipment through a reducer and a drive shaft in the cleaning bin. It can provide a sufficient non-combustion area for the conveyor belt, facilitate the cooling of the conveyor belt, and protect the connection between the conveyor belt and the reducer and the drive shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 The present invention is a schematic diagram of the overall structure of a combustion system used in a washing powder preparation process.

[0045] Figure 2It is a cross-sectional view of a side of the burner chamber.

[0046] Figure 3 It is a cross-sectional view of the other side of the burner chamber.

[0047] Figure 4 The present invention is a cross-sectional view of a combustion system used in a washing powder preparation process in the length direction.

[0048] Explanation of the accompanying drawings: 1. Burner chamber; 2. Gas combustion chamber; 3. Fan; 4. Conveyor belt; 5. Combustible gas outlet; 6. Feed gate; 7. Ash cleaning bin; 8. Air inlet; 9. Residue trough; 10. Conveying power equipment; 11. Front arch; 12. Middle arch; 13. Rear arch; 14. Silo; 15. Loading platform; 16. Closed door; 17. Slag hopper; 18. Gas through hole; 19. Mixing chamber; 20. Mixing hot air main pipe; 21. Exhaust chimney; 22. Hot air duct; 23. Cold air fan; 24. Mixing cold air duct; 25. Cooling plate; 26. Ash cleaning port; 27. First observation port; 28. Second observation port; 29. ​​Combustion arch; 30. Water inlet branch pipe; 31. Water outlet branch pipe. DETAILED DESCRIPTION

[0049] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0050] The embodiment of the present application discloses a combustion system for a washing powder preparation process and a control method thereof.

[0051] Reference Figure 1 and Figure 4As shown, a combustion system for a washing powder preparation process includes a fuel combustion structure, a feeding structure and a slag discharge structure, wherein the two ends of the fuel combustion structure are respectively provided with the feeding structure and the slag discharge structure, the fuel combustion structure is used for the combustion of biomass powder, the combustion system also includes a gas combustion structure, a water cooling structure, a steam generating structure, a gas mixing structure, a monitoring mechanism and a regulating mechanism, the gas combustion structure is used for the combustion of combustible gas, one side of the fuel combustion structure is connected with one end of the gas combustion structure, and the other end of the gas combustion structure is respectively connected with the steam generating structure and the gas mixing structure, the monitoring mechanism is used to monitor the temperature and pressure in the fuel combustion structure, the gas combustion structure, the gas mixing structure and the steam generating structure, the regulating mechanism is used to adjust the air intake in the fuel combustion structure, the hot air flux of the gas combustion structure and the gas mixing structure, the air intake in the gas mixing structure and the air outlet in the gas mixing structure, the water cooling structure is arranged inside the fuel combustion structure, the water cooling structure is externally connected with a water storage tank, the steam generating structure provides the steam required for the washing powder preparation process, and the monitoring mechanism is used to monitor the pressure and temperature in the fuel combustion structure, the gas combustion structure, the steam generating structure and the gas mixing structure. The combustion system outputs hot air, hot water and steam in an integrated manner. The fuel combustion structure realizes preliminary combustion, the gas combustion structure realizes subsequent full combustion, the water cooling structure provides cooling services, and the hot water after heat exchange can provide the downstream needs of the washing powder enterprise. The steam generation structure will generate a large amount of steam through heat exchange of the generated hot gas, and the gas mixing structure will regulate the generated hot air to an appropriate temperature and provide the downstream hot air to the washing powder enterprise. In addition to being suitable for the combustion of small-particle biomass powder, the fuel combustion structure of the present application can also be adapted to other forms of biomass powder, such as long strips, cylindrical and other large particles. The steam generation structure is a steam generator of the prior art, which is not shown in the figure. The feeding structure includes a silo 14, an elevator, a loading platform 15, etc. A feeding port is provided on the silo 14. The loading platform 15 is located vertically above the fuel combustion structure. The silo 14 is used in conjunction with the loading platform 15. Through the loading platform 15, the remaining fuel in the silo 14 and whether there is smoke can be observed. The elevator is arranged on one side of the fuel combustion structure, and a feeding port is connected vertically below the silo 14. The total opening length of the feeding port matches the width of the conveyor belt 4, so that the fuel released through the feeding port can cover the width direction of the conveyor belt 4. The fuel is stacked near the elevator, and the elevator transports the stacked fuel into the silo 14. The elevator adopts the design of an electric hoist plus a hook. The upper end of the electric hoist realizes the horizontal displacement of the fuel through a horizontal guide rail, and then moves it from the stacking area to the silo 14.The slag discharge structure includes a slag bucket 17, a slag discharger and a slag pit. Water is added to the slag discharger, and the amount of water added does not exceed the inspection hole of the slag discharger. The slag discharger is linked with the conveyor belt 4. The means of "linking the slag discharger with the conveyor belt 4" can be to control the respective power to provide the motor to rotate at the same speed, etc., to ensure the smoothness of slag discharge and slag discharge, and to avoid too much residue in the slag bucket 17 affecting the water seal effect, thereby affecting the negative pressure environment, temperature, combustion sufficiency, etc. in the burner chamber 1. The slag discharger adopts a small model in the prior art to meet the slag discharge requirements of combustion. The bottom of the slag bucket 17 is sealed and connected to the slag discharger, and a slag pit is set vertically below the end of the slag discharger away from the slag bucket 17. The slag pit is used to receive the water brought out by the slag discharger during the conveying process. After the conveyor belt 4 stops, the slag discharger needs to be opened for another 10 minutes to discharge the slag. The slag discharger cannot be stopped when the conveyor belt 4 is running to avoid the slag discharger jamming. The slag hopper 17 and the slag discharger are well sealed, and water is only added to the slag discharger, while the slag discharger pit does not need water, so as to facilitate the cleaning of the coke nodules; if the seal between the slag hopper 17 and the slag discharger is not good, water is allowed to be added to the slag pit, but the water level in the slag discharger cannot exceed the inspection hole of the slag discharger to prevent the slag or ash in the slag discharger from entering the slag pit, which is inconvenient to clean. The slag discharger includes a driving wheel assembly, a supporting wheel assembly, a driven wheel assembly, a chain plate assembly, a power output assembly, etc.

[0052] Reference Figure 2 and Figure 3As shown, the fuel combustion structure includes a burner chamber 1, a conveyor belt 4, a residue trough 9, a combustible gas outlet 5, a conveying power device 10, a combustible gas exhaust auxiliary structure, a feed gate 6 and a cleaning bin 7. The surrounding wall structure of the burner chamber 1 is made of refractory bricks, and the outside of the refractory bricks is evenly wrapped with insulation material. A metal shell is arranged on the outside of the insulation material, and the bottom of the burner chamber 1 is also made of refractory bricks. Two air inlets 8 are respectively provided on one side of the fuel combustion structure opposite to the gas combustion structure, wherein one of the air inlets 8 is close to the feeding structure, and the other air inlet 8 is close to the slag discharge structure. Both air inlets 8 are located above the level of the conveyor belt 4. The conveyor belt 4 is horizontally arranged in the burner chamber 1, one end of the conveyor belt 4 corresponds to the feeding of the feeding structure, and the other end of the conveyor belt 4 corresponds to the slag discharge structure. A residue trough 9 is provided at one end of the burner chamber 1 close to the slag discharge structure, and the length direction of the residue trough 9 is parallel to the width direction of the conveyor belt 4. The residue trough 9 is provided at one end of the conveyor belt 4, and the vertical bottom of the residue trough 9 is connected to the slag discharge structure. A combustible gas passage 5 is provided on a side of the burner chamber 1 close to the gas combustion structure, and the burner chamber 1 conveys the combustible gas to the gas combustion structure through the combustible gas passage 5. In the embodiment, the combustible gas exhaust assisting structure is arranged at the top of the burner chamber 1, the combustible gas passage 5 and the combustible gas exhaust assisting structure are arranged in sequence in the conveying direction of the conveyor belt 4, and a feed gate 6 is additionally arranged at the inlet end of the fuel combustion structure, which is cooled by a water cooling structure inside the feed gate 6. The feed gate 6 controls the discharge amount and speed of the feed structure to the conveyor belt 4, and adjusts the thickness of the fuel laid flat on the conveyor belt 4. The fuel combustion structure is also provided with a pressure sensor and a temperature sensor for detection, and a ash cleaning bin 7 is arranged at one end of the fuel combustion structure close to the feed structure, and the ash cleaning bin 7 is connected with the burner chamber 1, and the conveyor belt 4 extends into the ash cleaning bin 7, and is connected to the conveying power device 10 in the ash cleaning bin 7 through a reducer and a transmission shaft, and the conveying power device 10 is arranged on the side of the fuel combustion structure away from the gas combustion structure. One end of the slag discharger of the slag discharge structure is connected to the water seal of the fuel combustion structure, and the fuel height in the feed structure is maintained at not less than 50 cm. The bottom of the residue trough 9 is connected to the top of the slag bucket 17, so that the residue discharged from the conveying end of the conveyor belt 4 can be smoothly received by the residue trough 9 and then enter the slag bucket 17. The feed gate 6 is connected to the feed port of the feed structure, and is used to control the speed of releasing fuel from the feed port, and cooperate with the operation of the conveyor belt 4 to ultimately adjust the laying thickness of the fuel on the conveyor belt 4. The feed gate 6 can use existing technical structures such as adjusting bolts to adjust the degree of opening and closing. Fuel blank areas are reserved at both ends of the conveyor belt 4 in the width direction, which are used to transition the heat radiation of high-temperature fuel gas to the inner wall of the burner chamber 1, thereby reducing the heat damage to the inner wall of the burner chamber 1.The cleaning bin 7 is provided with a plurality of cleaning ports 26, a plurality of first observation ports 27, and a plurality of second observation ports 28. The plurality of cleaning ports 26 are arranged in parallel at the vertical bottom of one side of the cleaning bin 7. The fuel particles, slag ash, etc. dropped on the conveyor belt 4 are cleaned through the cleaning ports 26. The plurality of cleaning ports 26 are evenly distributed side by side in the width direction of the conveyor belt 4. The plurality of first observation ports 27 and the cleaning ports 26 are arranged on the same side of the cleaning bin 7. The plurality of first observation ports 27 are arranged side by side to observe whether the conveyor belt 4 is offset, etc. The plurality of second observation ports 28 are evenly distributed side by side on the top of the cleaning bin 7 to observe the situation above the conveyor belt 4. The tail of the burner chamber 1 is locally pressure-regulated through the closed door 16. The feed end of the burner chamber 1 can also be locally pressure-regulated through the cleaning ports 26, the plurality of first observation ports 27, and the plurality of second observation ports 28. All the above adjustments will affect the wind temperature, air volume and air pressure of the entire burner. During the adjustment, the operator should observe repeatedly until the entire burner is balanced. That is, the combustion in a negative pressure environment of this application is achieved by the comprehensive synergy of all relevant pressure regulation components.

[0053] Reference Figure 2 The water cooling structure includes a water inlet pipe, a water outlet pipe, a water valve, a cooling plate 25, a water inlet branch pipe 30 and a water outlet branch pipe 31. The water outlet end of the water inlet pipe is connected in parallel to one end of the cooling plate 25 and one end of the feed gate 6 through two water inlet branches 30, and the input end of the water outlet pipe is connected in parallel to the other end of the cooling plate 25 and the other end of the feed gate 6 through the water outlet branch pipe 31. A water valve is arranged on the water inlet pipe. The length direction of the cooling plate 25 is consistent with the conveying direction of the conveyor belt 4. A cooling plate 25 is arranged on both sides of the width of the conveyor belt 4.

[0054] Reference Figure 2 and Figure 3 , there are gaps between the two ends of the width of the conveyor belt 4 and the inner wall of the burner chamber 1, and the gap width is 6-15mm. The cooling plate 25 is arranged in the gap, and the transmission structure of the conveyor belt 4, such as the transmission chain, is also arranged in the gap. The cooling plate 25 is further arranged between the transmission chain and the conveyor belt 4. The cooling plate 25 can protect the transmission chain very well. The fuel combustion structure is provided with a through hole on the side wall at the outlet end, and there are two through holes. The two through holes are arranged on the same horizontal plane. The two through holes are arranged at both ends of the width direction of the conveyor belt 4. The horizontal plane where the two through holes are located is higher than the horizontal plane where the conveyor belt 4 is located and lower than the lowest point of the combustible gas exhaust structure. A hinged closed door 16 is arranged on the through hole. When observation and negative pressure adjustment are not required, the through hole is closed by the closed door 16. After heat exchange between the feed gate 6 and the cooling plate 25, the hot water in the outlet pipe is connected to the downstream production station to provide sufficient hot water for the downstream. The hot water transported to the downstream by the water outlet branch pipe 31 can also be connected back to the water inlet pipe or the water storage tank through a water pipe to achieve water recycling.

[0055] Reference Figure 1 The control mechanism includes a fan 3, an air inlet valve, a cold air fan 23, a vent valve and a cold air regulating valve. The fan 3 is arranged on the outside of the fuel combustion structure. The outlet of the fan 3 is connected to two air outlet pipes in parallel. A single air outlet pipe is connected to a single air inlet 8 through an air inlet valve. The cold air fan 23 is arranged on the outside of the gas mixing structure. The cold air fan 23 inputs cold air to the gas mixing structure. The cold air regulating valve adjusts the air volume of the cold air input by the cold air fan 23 to the gas mixing structure. The vent valve is arranged on the top of the gas mixing structure to control the opening and closing of the hot air released into the atmosphere.

[0056] Reference Figure 2 , the two air inlets 8 are arranged on the same horizontal plane, the horizontal plane where the two air inlets 8 are located is higher than the horizontal plane where the upper surface of the conveyor belt 4 is located, and the position of the air inlet 8 close to the slag discharge end of the conveyor belt 4 is lower than the lowest point of the combustible gas exhaust structure. In this way, it is ensured that the air intake of the air inlet 8 is smooth, unobstructed and effective, and the air intake is above the upper surface of the conveyor belt 4. The air inlet 8 close to the feed end of the conveyor belt 4 can well adjust the negative pressure at the feed end of the conveyor belt 4 and the fuel level at the feed end of the conveyor belt 4. Similarly, the air inlet 8 at the slag discharge end of the conveyor belt 4 can well adjust the negative pressure at the slag discharge end of the conveyor belt 4 and the combustion level at the slag discharge end of the conveyor belt 4, and finally realize the fuel combustion control within the combustion area of ​​the conveyor belt 4, that is, the combustion between the combustion arch 29 and the front arch 11 of the conveyor belt 4.

[0057] Reference Figure 2 and Figure 3As shown, the combustible gas exhaust-aiding structure includes a front arch 11, a middle arch 12 and a rear arch 13, which are arranged in sequence in the conveying direction of the conveyor belt 4. The front arch 11, the middle arch 12 and the rear arch 13 all start to arch from the same side wall of the combustible gas passage 5 in the burner chamber 1 along the top of the burner chamber 1. The arch height of the middle arch 12 is higher than that of the front arch 11, and the arch height of the rear arch 13 is higher than that of the middle arch 12. A combustion arch 29 is also added to the top of the inner wall of the fuel combustion structure. The combustion arch 29 is arranged at one end close to the feeding structure, and the combustible gas exhaust-aiding structure is arranged at one end close to the slag discharge structure. The combustion arch 29 and the combustible gas exhaust-aiding structure are used together inside the fuel combustion structure, and the combustible gas passage 5 is located between the combustion arch 29 and the combustible gas exhaust-aiding structure. There is no gap between the front arch 11 and the middle arch 12, and between the middle arch 12 and the rear arch 13. The front arch 11, the middle arch 12, the rear arch 13 and the combustion arch 29 are all made of refractory bricks. The combustion arch 29 builds a combustible gas barrier between the combustion zone and the feed port, and the front arch 11, the middle arch 12 and the rear arch 13 build another combustible gas barrier between the combustion zone and the outlet end, locking the high-temperature combustible gas in the combustion zone, and finally discharging it into the gas combustion structure through the combustible gas port 5. The front arch 11, the middle arch 12 and the rear arch 13 are getting lower and lower from the conveyor belt 4, and the combustible gas barrier is better formed.

[0058] Reference Figure 4 The gas combustion structure includes a plurality of gas combustion chambers 2 connected in series, two adjacent gas combustion chambers 2 are connected by gas through holes 18, and the two adjacent gas through holes 18 are staggered. A cleaning door is provided on a single gas combustion chamber 2. The inner wall, bottom and top of a single gas combustion chamber 2 are all made of refractory fire bricks, and the outside of the fire bricks is evenly wrapped with insulation materials. A metal shell is provided on the outside of the insulation materials. The gas combustion structure is connected to the steam generating structure through a first high-temperature gate valve, and the gas combustion structure is connected to the gas mixing structure through a second high-temperature gate valve. The combustible gas port 5 is located in the center of the width direction of the side wall of the gas combustion chamber 2. "Multiple gas combustion chambers 2 connected in series" The attached drawings of this application show five gas combustion chambers 2, namely the first gas combustion chamber, the second gas combustion chamber, the third gas combustion chamber, the fourth gas combustion chamber, and the fifth gas combustion chamber. The cleaning door on each gas combustion chamber 2 is used to clean dust, smoke, coke blocks, etc. in the inner cavity of the gas combustion chamber 2. “Staggered arrangement” means that the gas through holes 18 of the first gas combustion chamber and the second gas combustion chamber are opened on the left, the gas through holes 18 of the second gas combustion chamber and the third gas combustion chamber are opened on the right, the gas through holes 18 of the third gas combustion chamber and the fourth gas combustion chamber are opened on the left, and the gas through holes 18 of the fourth gas combustion chamber and the fifth gas combustion chamber are opened on the right. The height position of the gas through holes 18 is opened near the top of the gas combustion chamber 2, and the gas through holes 18 are adapted to the vertical height of the combustible gas port 5.

[0059] Reference Figure 1 The gas mixing structure includes a gas mixing chamber 19, a gas mixing cold air pipe 24, a gas mixing hot air pipe 20, an exhaust chimney 21 and a hot air pipe 22. A gas mixing cold air pipe 24 is connected to one of the sides of the gas mixing chamber 19, and a gas mixing hot air pipe 20 is connected to the top of the gas mixing chamber 19. The outlet end of the gas mixing hot air pipe 20 is connected in parallel with the exhaust chimney 21 and the hot air pipe 22. The hot air pipe 22 transports the hot air to the next washing powder production process. The gas mixing cold air pipe 24, the gas mixing hot air pipe 20 and the second high-temperature gate valve are respectively connected to different sides of the gas mixing chamber 19. The outlet end of the exhaust chimney 21 is connected to the vent valve. The hot air pipe 22 transports the hot air regulated by the gas mixing structure to the next process flow of the washing powder preparation process.

[0060] The monitoring mechanism includes a pressure sensor and a temperature sensor, and the pressure sensor and the temperature sensor are respectively arranged on the fuel combustion structure, the gas mixing structure, the gas combustion structure and the steam generation structure. The pressure sensor and the temperature sensor in the fuel combustion structure are used to monitor the combustion temperature and real-time pressure in the burner chamber 1, and assist in regulating the temperature required for the full combustion of the fuel, and the negative pressure environment in the burner chamber 1. The pressure sensor and the temperature sensor in the gas mixing structure are used to monitor the temperature and pressure of the hot air in the gas mixing chamber 19, and assist in regulating the overall temperature and pressure in the fuel combustion structure and the gas combustion structure. The pressure sensor and the temperature sensor in the gas combustion structure are used to monitor the temperature and pressure in the gas combustion chamber 2, and assist in regulating the temperature required for the full combustion of the fuel and the combustible gas, and the negative pressure environment in the burner chamber 1 and the gas combustion chamber 2. The pressure sensor and the temperature sensor in the steam generation structure are used to monitor the pressure and temperature of the steam, so as to regulate the amount and temperature of the hot air delivered from the gas combustion chamber 2 to the steam generation structure, and this further regulation is realized by the opening of the first high-temperature gate valve.

[0061] A method for controlling a combustion system for a washing powder preparation process comprises the following steps:

[0062] 1) Make preparations before combustion: open the water valve to fill the water cooling structure with cold water; run the unloaded conveyor belt 4 to ensure that the conveyor belt 4 is straight and has no deviation; open the vent valve, the first high-temperature gate valve, and the second high-temperature gate valve; fill the biomass powder in the feed structure and ensure that the water content of the biomass powder is 8-12%, and select medium-weak adhesive biomass powder; the selection of the water content and type of the biomass powder is to ensure that in the combustion system of the present application, the biomass powder can match the functional structure and functional control of its combustion system, so as to better achieve full combustion, harmless combustion, and zero-emission combustion.

[0063] 2) Ignition and baking of burner chamber 1: When the temperature of burner chamber 1 is below 300°C, firewood is used for baking, and when the temperature is above 300°C, biomass powder is used for baking. The temperature is determined by the temperature sensor in burner chamber 1. The pressure is observed by the pressure sensor in burner chamber 1, and the opening of the first high-temperature gate valve and the second high-temperature gate valve is adjusted to maintain a slight negative pressure in burner chamber 1.

[0064] 2a: First baking of burner chamber 1: 0-150℃ baking for 36 hours, 150℃ insulation for 60 hours, 150-400℃ rising by 3℃ per hour, 400℃ insulation for 24 hours, 400-600℃ rising by 4℃ per hour, 600℃ insulation for 48 hours, 600-800℃ rising by 6℃ per hour, 800-1000℃ rising by 8℃ per hour;

[0065] 2b: Late baking of burner chamber 1: baking at 0-150℃ for 8 hours, keeping at 150℃ for 8 hours, increasing temperature by 15℃ per hour at 150-600℃, keeping temperature at 600℃ for 8 hours, increasing temperature by 20℃ per hour at 600-800℃, and increasing temperature by 30℃ per hour above 800℃; The overall steps of igniting and baking burner chamber 1 are to ensure that under the subsequent continuous high-temperature combustion of 900℃, the front end, middle end and end of the combustion channel can have a long service life, thereby providing guarantee for the continuous operation required for the normal combustion of the combustion system of this application, that is, providing guarantee for the continuous output of hot air, hot water and steam.

[0066] 3) When the temperature of the burner chamber 1 reaches 300°C, start the slag discharger, and adjust the speed of the conveyor belt 4 and the fan 3 according to the temperature and time requirements of the burner chamber 1; adjust the thickness of the upper material layer of the conveyor belt 4 to 120-220cm through the feed gate 6; open the cold air regulating valve of the mixing chamber 19, introduce cold air, and adjust the temperature of the exhaust chimney 21 to a normal emission range; the thickness of the upper material layer of the conveyor belt 4 cooperates with the controlled combustion of the combustion area to ensure full combustion.

[0067] 4) When the temperature in the gas combustion chamber 2 near the mixing chamber 19 rises to 800°C, close the vent valve of the exhaust chimney 21, and adjust the opening degree of the cold air regulating valve on the mixing chamber 19 so that the temperature in the hot air pipe 22 reaches the required temperature for washing powder production, and adjust the opening degree of the first high-temperature gate valve and the second high-temperature gate valve so that the burner chamber 1 maintains a slight negative pressure; and continuously control the temperature in the gas combustion chamber 2 near the mixing chamber 19 to be stable at 900°C; the combustion area of ​​the biomass powder on the conveyor belt 4 is controlled to burn out after the combustion arch 29 and 30cm before the rear arch 13; the combustion area control is closely related to the thickness of its fuel layer, the water content of the fuel, the negative pressure environment of the combustion channel, the temperature of the combustion channel, the combustion arch 29, the combustible gas exhaust structure, etc. Burning out after the combustion arch 29 and 30cm before the rear arch 13 can better control the combustible gas from entering the gas combustion chamber 2.

[0068] 4a: If the temperature in the hot air pipe 22 exceeds the temperature required for production, the rotation speed of the conveyor belt 4 and the air intake of the fan 3 to the burner chamber 1 can be reduced; or the cold air regulating valve on the mixing chamber 19 can be opened;

[0069] 4b: If the temperature in the hot air pipe 22 is lower than the temperature required for production, the rotation speed of the conveyor belt 4 and the air intake of the fan 3 to the burner chamber 1 can be increased; or the cold air regulating valve on the mixing chamber 19 can be closed;

[0070] 4c: If the combustion is intense at the front end near the combustion arch 29, but is completely burned out before reaching the combustion area of ​​the rear arch 13, adjust the opening of the two air inlet valves, close the air inlet valve near the feeding structure, and open the air inlet valve near the slag discharge structure, so that the combustion of the biomass powder at the front end in the conveying direction of the conveyor belt 4 is weakened, and the biomass powder is fully burned in the combustion area.

[0071] The implementation principle of one embodiment of the present application is as follows: using the combustion system of the present application, the biomass powder is burned in the burner chamber 1 to generate combustible gas, the combustible gas is fully burned through the gas combustion chamber 2 to produce hot air, the steam required for the downstream is generated through heat exchange in the steam generating structure, the required hot air is transported to the downstream through temperature adjustment in the gas mixing chamber 19, and the water cooling structure in the burner chamber 1 realizes the output of hot water to transport the required hot water to the downstream. In the combustion channel formed by the burner chamber 1 and the gas combustion chamber 2, a negative pressure environment is always maintained, and the temperature in the fifth gas combustion chamber is controlled at 900°C. The combustible gas is secondary burned and polymerized and purified in multiple gas combustion chambers 2, and finally harmless and zero-emission combustion is achieved.

[0072] The hot air temperature of the hot air inlet main pipe 20 (i.e., the drying tower) is adjusted by adjusting the cold air regulating valve; the total combustible gas supply is adjusted by adjusting the fuel intake and the combustion-supporting air volume (specifically adjusting the fan 3 and the air inlet valve), and finally the total heating air volume is adjusted; the burner chamber 1 and the multiple gas combustion chambers 2 are kept at negative pressure by adjusting the cold air fan 23, the cold air regulating valve, the first high-temperature gate valve, and the second high-temperature gate valve. The tail of the burner chamber 1 is locally regulated by the closed door 16, and the feed end of the burner chamber 1 can also be locally regulated by the ash cleaning port 26, the multiple first observation ports 27, and the multiple second observation ports 28. All of the above adjustments will affect the air temperature, air volume, and air pressure of the entire combustion system. During the adjustment, the operator should observe repeatedly until the entire combustion system is balanced, that is, the full combustion in the negative pressure environment of this application is achieved by the comprehensive synergy of all the relevant pressure regulation components.

[0073] Before the burner chamber 1 starts, it is necessary to fill the water cooling structure with cold water, open the vent valve, the second high-temperature gate valve and the first high-temperature gate valve, ignite and dry the burner chamber 1, detect the temperature in the burner chamber 1 through the temperature sensor, detect the pressure in the burner chamber 1 through the pressure sensor, and adjust the second high-temperature gate valve and the first high-temperature gate valve to keep a slight negative pressure in the burner chamber 1. When the temperature in the burner chamber 1 reaches the next stage, start the slag discharger, adjust the speed of the reducer and the combustion-supporting fan 3 of the conveyor belt 4 according to the temperature and time requirements of the burner chamber 1; adjust the thickness of the fuel layer on the conveyor belt 4 through the feed gate 6. In order to prevent the temperature of the exhaust chimney 21 from being too high, open the cold air regulating valve of the mixing chamber 19 to let in an appropriate amount of cold air. When the temperature of the gas combustion chamber 2 reaches the qualified temperature, hot air can be delivered to the drying tower for washing powder production. First, the induced draft fan is turned on in the washing powder drying workshop, and the hot air enters the drying tower. Then the vent valve of the exhaust chimney 21 is closed, and the opening degree of the cold air regulating valve is adjusted to adjust the hot air temperature in the mixing chamber 19 to the temperature required for the production of the drying tower. The whole process should be carried out step by step. If the input hot air temperature rises, the frequency of the reducer of the conveyor belt 4 and the frequency of the combustion-supporting fan 3 should be slowly reduced to reduce the amount of fuel, or the cold air regulating valve should be opened to increase the amount of cold air, and the input hot air temperature should be maintained. The burner chamber 1 should always maintain a slightly negative pressure state, and the vent valve of the exhaust chimney 21 should be in a closed state.

[0074] According to the production requirements, adjust the feeding speed of the conveyor belt 4 and observe the combustion situation in the burner chamber 1; adjust the speed of the combustion-supporting fan 3 and the opening of the two air inlet valves to make the flame uniform and white, and the fuel layer stable. Try to let the fuel burn out 30 cm in front of the rear arch 13 to reduce the amount of ash raised, avoid strong combustion of the fuel in the front of the burner chamber 1 and keep the temperature of the gas combustion chamber 2 (the measuring point is located in the gas combustion chamber 2 in front of the mixing chamber 19) at about 900°C. Observe the combustion of the fuel on the conveyor belt 4. It should be basically a horizontal straight line (parallel to the width direction of the conveyor belt 4) at the burnout point. The fuel layer should be burned out about 30 cm in front of the rear arch 13. If the fuel layer burns strongly in the front half of the conveyor belt 4 and is burned out at a long distance from the rear arch 13, the air inlet valve should be adjusted, the air inlet valve at the inlet end of the burner chamber 1 should be closed, and the air inlet valve at the outlet end of the burner chamber 1 should be opened to reduce the combustion speed of the fuel layer in the front part, reasonably utilize the effective area of ​​the conveyor belt 4, and allow the fuel layer to burn evenly in the combustion area on the entire conveyor belt 4 to reduce the amount of ash raised, prevent local overheating and large amounts of ash raised and coking.

[0075] During the combustion process, there should be enough fuel in the feeding structure to maintain the continuity of combustion and to seal the feeding position. The hot air temperature should be maintained during normal production (the hot air temperature of the gas combustion chamber 2 directly affects the subsequent output hot air temperature and the hot air temperature entering the steam generating structure), so that it is suitable for the washing powder production process, and the opening degree of the cold air regulating valve should be adjusted to keep the output hot air temperature stable.

[0076] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A combustion system for a washing powder preparation process, comprising a fuel combustion structure, a feeding structure and a slag discharge structure, wherein the feeding structure and the slag discharge structure are respectively arranged at both ends of the fuel combustion structure, and the fuel combustion structure is used for the combustion of biomass powder, and is characterized in that: The combustion system also includes a gas combustion structure, a water cooling structure, a steam generating structure, a gas mixing structure, a monitoring mechanism and a regulating mechanism. The gas combustion structure is used for the combustion of combustible gas. One side of the fuel combustion structure is connected to one end of the gas combustion structure, and the other end of the gas combustion structure is respectively connected to the steam generating structure and the gas mixing structure. The monitoring mechanism is used to monitor the temperature and pressure in the fuel combustion structure, the gas combustion structure, the gas mixing structure and the steam generating structure. The regulating mechanism is used to adjust the air intake in the fuel combustion structure, the hot air flux of the gas combustion structure and the gas mixing structure, the air intake in the gas mixing structure and the air outlet in the gas mixing structure. The water cooling structure is arranged inside the fuel combustion structure, and the water cooling structure is externally connected to a water storage tank. The steam generating structure provides the steam required for the washing powder preparation process. The fuel combustion structure comprises a burner chamber (1), a conveyor belt (4), a residue trough (9), a combustible gas outlet (5), a conveying power device (10), a combustible gas exhaust assisting structure, a feed gate (6) and a ash cleaning bin (7). The surrounding wall structure of the burner chamber (1) is made of refractory bricks, and a heat-insulating material is evenly wrapped on the outside of the refractory bricks. A metal shell is arranged on the outside of the heat-insulating material. Two air inlets (8) are respectively arranged on one side of the fuel combustion structure opposite to the gas combustion structure, and one of the air inlets (8) is close to the feed structure. The burner chamber (1) has a slag discharge structure, and the other air inlet (8) is close to the slag discharge structure. The two air inlets (8) are located above the conveyor belt (4). The conveyor belt (4) is horizontally arranged in the burner chamber (1). One end of the conveyor belt (4) corresponds to the feed of the feed structure, and the other end of the conveyor belt (4) corresponds to the slag discharge structure. A slag trough (9) is arranged at one end of the burner chamber (1) close to the slag discharge structure. The length direction of the slag trough (9) is parallel to the width direction of the conveyor belt (4). The slag trough (9) is arranged at one end of the conveyor belt (4). The vertical bottom of the slag trough (9) is The combustion chamber (1) is connected to the slag discharge structure, a combustible gas port (5) is provided on a side of the burner chamber (1) close to the gas combustion structure, the burner chamber (1) conveys the combustible gas to the gas combustion structure through the combustible gas port (5), the combustible gas exhaust assisting structure is arranged at the top of the burner chamber (1), the combustible gas port (5) and the combustible gas exhaust assisting structure are arranged in sequence in the conveying direction of the conveyor belt (4), and a feed gate (6) is additionally provided at the inlet end of the fuel combustion structure, the inside of the feed gate (6) is cooled by a water cooling structure, and the feed gate (6) controls the feed structure to The discharge amount and speed of the conveyor belt (4) are adjusted to adjust the thickness of the fuel spread on the conveyor belt (4); the fuel combustion structure is also provided with a pressure sensor and a temperature sensor for detection; a ash cleaning bin (7) is arranged at one end of the fuel combustion structure close to the feeding structure; the ash cleaning bin (7) is communicated with the burner chamber (1); the conveyor belt (4) extends into the ash cleaning bin (7) and is connected to the conveying power device (10) in the ash cleaning bin (7) through a reducer and a transmission shaft; the conveying power device (10) is arranged on the side of the fuel combustion structure away from the gas combustion structure; The combustible gas exhaust-aiding structure comprises a front arch (11), a middle arch (12) and a rear arch (13), wherein the front arch (11), the middle arch (12) and the rear arch (13) are arranged in sequence in the conveying direction of the conveyor belt (4), and the front arch (11), the middle arch (12) and the rear arch (13) all start to rise from the same side wall of the combustible gas passage (5) in the burner chamber (1) along the top of the burner chamber (1), the arch height of the middle arch (12) is higher than that of the front arch (11), and the arch height of the rear arch (13) is higher than that of the middle arch (12). A combustion arch (29) is further provided on the top of the inner wall of the fuel combustion structure, wherein the combustion arch (29) is arranged at one end close to the feeding structure, and the combustible gas exhaust-aiding structure is arranged at one end close to the slag discharge structure. The combustion arch (29) and the combustible gas exhaust-aiding structure are used in combination inside the fuel combustion structure, and the combustible gas passage (5) is located between the combustion arch (29) and the combustible gas exhaust-aiding structure.

2. A combustion system for a washing powder preparation process according to claim 1, characterized in that: The water cooling structure comprises a water inlet pipe, a water outlet pipe, a water valve, a cooling plate (25), a water inlet branch pipe (30) and a water outlet branch pipe (31); the water outlet end of the water inlet pipe is connected in parallel to one end of the cooling plate (25) and one end of the feed gate (6) through two water inlet branches (30); the input end of the water outlet pipe is connected in parallel to the other end of the cooling plate (25) and the other end of the feed gate (6) through the water outlet branch pipe (31); a water valve is arranged on the water inlet pipe; the length direction of the cooling plate (25) is consistent with the conveying direction of the conveyor belt (4); and a cooling plate (25) is arranged on both sides of the width of the conveyor belt (4).

3. A combustion system for a washing powder preparation process according to claim 1, characterized in that: The control mechanism comprises a fan (3), an air inlet valve, a cold air fan (23), a vent valve and a cold air regulating valve. The fan (3) is arranged outside the fuel combustion structure. The outlet of the fan (3) is connected to two air outlet pipes in parallel. A single air outlet pipe is connected to a single air inlet (8) via an air inlet valve. The cold air fan (23) is arranged outside the gas mixing structure. The cold air fan (23) inputs cold air to the gas mixing structure. The cold air regulating valve adjusts the air volume of the cold air input by the cold air fan (23) to the gas mixing structure. The vent valve is arranged at the top of the gas mixing structure and is used to control the opening and closing of hot air released into the atmosphere.

4. A combustion system for a washing powder preparation process according to claim 1, characterized in that: The gas combustion structure comprises a plurality of gas combustion chambers (2) connected in series, two adjacent gas combustion chambers (2) are connected via a gas through hole (18), the two adjacent gas through holes (18) are staggered, a cleaning door is provided on each gas combustion chamber (2), the inner wall, bottom and top of each gas combustion chamber (2) are all made of refractory fire bricks, the outside of the fire bricks are evenly wrapped with a heat-insulating material, a metal shell is provided on the outside of the heat-insulating material, the gas combustion structure is connected to the steam generating structure via a first high-temperature gate valve, the gas combustion structure is connected to the gas mixing structure via a second high-temperature gate valve, and the combustible gas through hole (18) is located at the center of the width direction of the side wall of the gas combustion chamber (2).

5. The combustion system for washing powder preparation process according to claim 1, characterized in that: The air mixing structure comprises an air mixing chamber (19), an air mixing cold air pipe (24), an air mixing hot air pipe (20), an exhaust chimney (21) and a hot air pipe (22); the air mixing cold air pipe (24) is connected to one side of the air mixing chamber (19); the air mixing hot air pipe (20) is connected to the top of the air mixing chamber (19); the air outlet end of the air mixing hot air pipe (20) is connected in parallel to the exhaust chimney (21) and the hot air pipe (22); the hot air pipe (22) transports the hot air to the next washing powder production process.

6. A combustion system for a washing powder preparation process according to claim 1, characterized in that: The monitoring mechanism comprises a pressure sensor and a temperature sensor, and the pressure sensor and the temperature sensor are respectively arranged on the fuel combustion structure, the gas mixing structure, the gas combustion structure and the steam generation structure.

7. A combustion system for a washing powder preparation process according to claim 1, characterized in that: One end of the slag discharger of the slag discharge structure is connected to the fuel combustion structure water seal, and the fuel height in the feeding structure is maintained at not less than 50 cm.

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