Gasification-combustion integrated combustor for wide load peak shaving

Abstract

The utility model belongs to the wide load peak shaving technical field of power plant coal powder boiler, concretely relates to a gasification - combustion integrated combustor for wide load peak shaving, including gasification device and burner, the gasification device includes nozzle and furnace body, the tail end of nozzle is connected with the front end of furnace body through flange, the tail end of furnace body is connected with burner through flange, the inner middle part of burner is provided with cyclone device, the utility model adopts coal heat conversion upgrading technology to its front end gasification device, enhances fuel activity, improves the burnout rate of coal powder in the subsequent combustion process, also reduces the emission of nitrogen oxides in the combustion process, the rear burner adopts cyclone mixing technology, improves the mixing degree of coal powder and air, and the front and rear device materials realize efficient mixed combustion at the tail of ignition tube, further improve the combustion efficiency of boiler.

Description

Technical Field

[0001] This utility model belongs to the field of wide-load peak shaving technology for pulverized coal boilers in power plants, specifically relating to an integrated gasification-combustion burner for wide-load peak shaving. Background Technology

[0002] Currently, thermal power accounts for 44% of my country's installed capacity and 67% of its power generation, making it the largest source of electricity supply. As the core component of pulverized coal boilers in power plants, the burner's performance directly affects the safe and stable operation of the unit. Traditional burners generally suffer from uneven mixing of pulverized coal and air, low combustion efficiency, unstable combustion, and high pollutant emissions (NOx > 500 mg / Nm³). 3 Problems such as significant load fluctuations and drastic changes in combustion conditions under low-load conditions exacerbate these issues, seriously affecting the safe and stable operation of the unit. Currently, most existing burners employ staged combustion and premixing technologies, which typically struggle to simultaneously meet the demands of stable combustion at low loads and efficient combustion at high loads. Utility Model Content

[0003] This invention addresses the problem that the aforementioned burners cannot simultaneously meet the requirements of stable combustion under low boiler load and efficient combustion under high load, by providing an integrated gasification-combustion burner for wide-load peak shaving.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An integrated gasification-combustion burner for wide-load peak shaving includes a gasification device and a burner. The gasification device includes a nozzle and a furnace body. A No. 1 oil gun and a No. 1 ignition gun are fixedly installed at the inlet of the nozzle. A pulverized coal pipe and a hot secondary air pipe are arranged sequentially from left to right on the nozzle. A hand hole, a thermocouple, and a pressure measuring element are fixedly installed sequentially from left to right on the furnace body. The thermocouple and pressure measuring element are used to detect the temperature and pressure inside the furnace body in real time. The end of the nozzle is connected to the front end of the furnace body through a flange. The end of the furnace body is connected to the burner through a flange. A swirl device is arranged in the middle of the burner.

[0006] Furthermore, the burner includes an ignition tube and a shell. The end of the furnace body is fixedly connected to the ignition tube via a flange. The ignition tube passes through a sleeve and enters the bend of the main pulverized coal pipe. The ignition tube can be axially extended and retracted within the sleeve to adapt to the flame length requirements under different combustion conditions and extends to the tail of the main pulverized coal pipe. The sleeve is welded to the bend of the main pulverized coal pipe. The ignition tube passes through a swirl device, which is fixedly installed between the main pulverized coal pipe and the ignition tube at the center of the burner. A second oil gun and a second ignition gun are fixedly installed on the shell. A viewing hole is fixedly installed at the lower part of the shell. An inner secondary air duct is provided on the outer wall of the main pulverized coal pipe, and an outer secondary air duct is provided on the outer side of the inner secondary air duct. The end of the burner is configured as a bell mouth.

[0007] Furthermore, the swirling device includes an outer ring support, which has a tapered multi-ring design and is fixedly installed inside the burner. An inner ring sleeve is fixedly installed inside the outer ring support, and three blades are fixedly installed between the inner ring sleeve and the outer ring support. The three blades are evenly distributed in a ring array with the inner ring sleeve as the center. The inner ring sleeve is slidably connected to the ignition tube.

[0008] Furthermore, the ratio of the outer diameter of the ignition tube to the outer diameter of the outer ring support is set to 0.30-0.55, and the ratio of the inner diameter to the outer diameter of the ignition tube is set to 0.50-0.83.

[0009] Furthermore, a pulverized coal regulating valve is installed on the pulverized coal pipe.

[0010] Furthermore, a regulating valve for the secondary hot air duct is fixedly installed on the secondary hot air duct.

[0011] Furthermore, the housing is provided with an air distribution baffle, which is used to control the air volume and adjust the mixing ratio of pulverized coal and air in the burner. A flame detector is fixedly installed inside the housing to monitor the combustion status of the flame in the burner.

[0012] Furthermore, both the thermocouple and the pressure measuring element are connected to an external controller. The temperature detection of the thermocouple is fed back to the external controller, which controls the temperature inside the furnace. The pressure detection of the pressure measuring element is fed back to the external controller, which regulates the pressure inside the furnace.

[0013] Furthermore, the main pulverized coal pipe is L-shaped, with the vertical section of the main pulverized coal pipe fixedly installed outside the shell, and the horizontal section of the main pulverized coal pipe entering the shell and extending to the end of the shell. A 90° elbow is provided between the vertical and horizontal sections, and the 90° elbow is fixedly connected to the vertical and horizontal sections by a flange.

[0014] A method for using an integrated gasification-combustion burner for wide-load peak shaving, characterized by dividing the operation into the following three conditions based on dispatching instructions:

[0015] When the dispatching command is greater than or equal to the unit's minimum output, the unit's minimum output refers to the minimum load of the boiler before the modification when it is not injected with oil. The gasification unit does not participate in the operation, and only the burner participates in the operation.

[0016] When the minimum load of the modified boiler without oil injection is less than the dispatch command and less than the unit's minimum output, the gasification unit and burner need to operate together. First, the gasification unit of the burner needs to be preheated. After preheating, the pulverized coal regulating valve is opened to allow pulverized coal to enter the gasification unit from the pulverized coal pipe. During this process, the pulverized coal regulating valve adjusts the pulverized coal feed rate, the thermocouple is used for temperature detection, and the pressure measuring element is used for pressure testing. The hot secondary air regulating valve is then opened to allow hot secondary air to enter the gasification unit for regulation, adjusting the combustion conditions of the gasification unit. After the temperature of the gasification unit stabilizes, the No. 1 oil gun is closed and withdrawn. Subsequently, the boiler load is increased / decreased, and the gasification is regulated during the process. The ratio of pulverized coal to air in the device is set to 0.5-4 to control the degree of pulverized coal gasification. Part of the pulverized coal enters the cyclone device from the main pulverized coal pipe. At the same time, the air distribution baffle controls the mixing ratio of pulverized coal and air in the main pulverized coal pipe. The cyclone device enables pulverized coal and air to be efficiently mixed around the ignition tube. Another part of the pulverized coal generates hot coal gas and hot pulverized coal in the gasification device and is transported to the tail of the ignition tube. Finally, the product of the gasification device and the material of the burner are mixed and burned at the tail of the ignition tube and injected into the furnace of the boiler. By adjusting the baffles of the external and internal secondary air pipes, sufficient oxygen is provided to the tail of the burner to achieve efficient and stable combustion of fuel at the tail of the ignition tube.

[0017] When the minimum load of the modified boiler in the non-oil-injection state exceeds the dispatch command, the boiler will be shut down as a whole, and the burners will take shutdown protection measures. During shutdown protection, the gasification device will be shut down first, and the hot secondary air will purge the residual coal powder in the gasification device. Then, the coal powder feed rate of the burner will be gradually reduced hourly until the feed is stopped and the boiler stops operating.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. The gasification device at the front end of this utility model adopts coal thermal conversion and upgrading technology, which enhances fuel activity, improves the burnout rate of pulverized coal in the subsequent combustion process, and also reduces nitrogen oxide emissions during combustion. The burner at the rear end adopts swirl mixing technology, which improves the mixing degree of pulverized coal and air. The materials at both ends of the burner achieve efficient mixing and combustion at the tail of the ignition tube, further improving the combustion efficiency of the boiler.

[0020] 2. This utility model improves fuel activity through coal gasification upgrading technology, promotes the mixing of pulverized coal and air through swirl mixing technology, and achieves flexible adjustment of the boiler within the range of 20% to 100% rated load through gasification and combustion synergistic coupling technology.

[0021] 3. This utility model features an integrated design with a simple structure, small footprint, and low equipment failure rate. The gasification device can be flexibly equipped with mechanical / electronic components such as temperature and pressure measuring devices according to actual needs. The gasification device and the ignition pipe are connected by a flange, and the ignition pipe and the burner are connected through a flange sleeve around the ignition pipe. Therefore, the distance between the ignition pipe and the burner outlet can be flexibly adjusted from 200 to 300 mm according to actual needs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the burner of this utility model;

[0024] Figure 3 This is a schematic diagram of the cyclone device of this utility model;

[0025] Figure 4 This is a schematic diagram of the external structure of the burner of this utility model;

[0026] In the diagram, 1 is the nozzle, 2 is the furnace body, 3 is the No. 1 oil gun, 4 is the No. 1 ignition gun, 5 is the pulverized coal pipe, 6 is the hot secondary air pipe, 7 is the hand hole, 8 is the thermocouple, 9 is the pressure measuring element, 10 is the swirl device, 11 is the ignition tube, 12 is the shell, 13 is the sleeve, 14 is the main pulverized coal pipe, 15 is the observation hole, 16 is the inner secondary air pipe, 17 is the outer secondary air pipe, 18 is the bell mouth, 19 is the outer ring support, 20 is the inner ring sleeve, 21 is the blade, 22 is the pulverized coal regulating valve, 23 is the hot secondary air pipe regulating valve, 24 is the air distribution baffle, 25 is the flame detector, 26 is the No. 2 oil gun, and 27 is the No. 2 ignition gun. Detailed Implementation

[0027] To further illustrate the technical solution of this utility model, the following embodiments will be used to further explain this utility model.

[0028] Taking a 500MW subcritical unit with opposed combustion on the front and rear walls as an example, the gasification-combustion integrated burner for wide load peak shaving includes 6 coal mills and 24 burners in 3 layers. Each mill provides pulverized coal fuel to 4 burners on the same layer of the front and rear walls. Before the modification, the minimum load of the unit was 50% of the rated load. The modification method is to replace the bottom layer burners of the boiler with 8 gasification-combustion integrated burners, which are symmetrically arranged on the front and rear walls, with 4 burners on the front wall and 4 burners symmetrically arranged on the rear wall on the same layer. Example

[0029] like Figure 1 As shown, an integrated gasification-combustion burner for wide-load peak shaving includes a gasification unit and a burner. The pulverized coal feed rates of the gasification unit and the burner are independently adjustable: the gasification unit feed rate is 0-1 t / h, and the burner feed rate is 6-8 t / h under low-load conditions and 10-15 t / h under high-load conditions. The gasification unit includes a nozzle 1 and a furnace body 2. From left to right, a No. 1 oil gun 3, a No. 1 ignition gun 4, a pulverized coal pipe 5, and a hot secondary air pipe 6 are fixedly installed on the nozzle 1. A pulverized coal regulating valve 22 is provided at the connection between the pulverized coal pipe 5 and the nozzle 1. A regulating valve 23 for the secondary air duct 6 is fixedly installed at the connection between the secondary air duct 6 and the nozzle 1. From left to right, a handhole 7, a thermocouple 8, and a pressure measuring element 9 are fixedly installed on the furnace body 2. The thermocouple 8 and the pressure measuring element 9 are used to monitor the temperature and pressure inside the furnace body 2 in real time. Both the thermocouple 8 and the pressure measuring element 9 are connected to an external controller. The temperature detected by the thermocouple 8 is fed back to the external controller, which controls the temperature inside the furnace. The pressure detected by the pressure measuring element 9 is also fed back to the external controller, which regulates the pressure inside the furnace. The end of the nozzle 1 is connected to the front end of the furnace body 2 via a flange. A burner is connected to the end of the furnace body 2 via a flange, and a swirling device 10 is installed in the middle of the burner.

[0030] like Figure 1 and Figure 2 As shown, the burner includes an ignition pipe 11 and a housing 12. The end of the furnace body 2 is fixedly connected to the ignition pipe 11 via a flange. The ignition pipe 11 passes through a sleeve 13 and enters the bend of the main pulverized coal pipe 14. The ignition pipe 11 can be axially extended and retracted within the sleeve 13 to adapt to the flame length requirements under different combustion conditions, and extends to the tail of the main pulverized coal pipe 14. The sleeve 13 is welded to the bend of the main pulverized coal pipe 14. The main pulverized coal pipe 14 is L-shaped. The vertical pipe of the main pulverized coal pipe 14 is fixedly installed outside the housing 12, and the horizontal pipe of the main pulverized coal pipe 14 enters the interior of the housing 12 and extends to the end of the housing 12. A 9-gauge joint is provided between the vertical pipe and the horizontal pipe. The 90° elbow is fixedly connected to the vertical and horizontal pipes via a flange. The ignition pipe 11 passes through the swirl device 10, which is fixedly installed between the main pulverized coal pipe 14 and the ignition pipe 11, and at the center of the burner. A second oil gun 26 and a second ignition gun 27 are fixedly installed on the housing 12. A viewing hole 15 is fixedly installed at the lower part of the housing 12. An inner secondary air duct 16 is provided on the outer wall of the main pulverized coal pipe 14. An outer secondary air duct 17 is provided on the outer side of the inner secondary air duct 16. The outer secondary air duct 17 and the inner secondary air duct 16 are connected to an external controller, which can adjust the air level in multiple stages. The end of the burner is set as a bell mouth 18.

[0031] like Figure 3 As shown, the swirling device 10 includes an outer ring support 19, which has a tapered multi-ring design and is fixedly installed inside the burner. An inner ring sleeve 20 is fixedly installed inside the outer ring support 19. Three blades 21 are fixedly installed between the inner ring sleeve 20 and the outer ring support 19. The three blades 21 are evenly distributed in a ring array with the inner ring sleeve 20 as the center. The inner ring sleeve 20 is slidably connected to the ignition tube 11. The ratio of the outer diameter of the ignition tube 11 to the outer ring of the outer ring support 19 is set to 0.30-0.55, and the ratio of the inner diameter to the outer diameter of the ignition tube 11 is set to 0.50-0.83.

[0032] like Figure 4 As shown, an air distribution baffle 24 is provided on the housing 12. The air distribution baffle 24 is used to control the air volume and adjust the mixing ratio of pulverized coal and air in the burner. A flame detector 25 is fixedly installed inside the housing 12 to monitor the combustion state of the flame in the burner.

[0033] The unit operates stably at 35% of its rated load under low-load conditions, with a 15% increase in deep peak-shaving capacity. When the rated load of the unit decreases from 50% to 35%, the specific operating conditions of a single integrated gasification-combustion burner, based on dispatch instructions, are as follows:

[0034] When the dispatching command is greater than or equal to 50% of the unit's rated load, the gasification unit does not participate in operation, and only the burner participates in operation;

[0035] When the dispatch command is less than 50% of the unit's rated load, the gasification unit and the burner must operate together. First, the gasification unit needs to be preheated at a temperature of 700℃-900℃ for 1-2 hours. The opening of the pulverized coal regulating valve 22 is set to 30%-100%, and the pulverized coal feed rate is adjusted to 0-1 hour, allowing pulverized coal to enter the gasification unit from the pulverized coal pipe 5. During this period, the pulverized coal regulating valve 22 adjusts the pulverized coal feed rate. The thermocouple 8 detects the temperature and feeds it back to the external controller. The internal controller adjusts the furnace temperature to 750℃-1000℃. Pressure measuring element 9 measures the pressure and sends feedback to the external controller, which adjusts the furnace pressure to -0.2KPa to +0.5KPa. The hot secondary air regulating valve 23 is opened at an opening degree of 0-10%, allowing hot secondary air to enter the gasification device for regulation. This regulates the combustion conditions of the gasification device. After the temperature of the gasification device stabilizes, the No. 1 oil gun 3 is closed and withdrawn. Subsequently, the boiler load is reduced. During the load reduction operation, the front / rear walls are closed first. The coal mills corresponding to the four ordinary burners in the middle layer of the wall ensure that the boiler maintains the operation of three coal mills and twelve burners. This means the furnace feed rate gradually decreases from 180-190 t / h to 105-120 t / h. During this process, the ratio of pulverized coal to air in the gasification device is adjusted to 0.5-4 to control the degree of pulverized coal gasification. A portion of the pulverized coal enters the cyclone device 10 from the main pulverized coal pipe 14. Simultaneously, the air distribution baffle 24 controls the mixing ratio of pulverized coal and air in the main pulverized coal pipe 14. The flow device 10 enables efficient mixing of pulverized coal and air around the ignition tube 11. Another portion of the pulverized coal generates hot coal gas and hot pulverized coal in the gasification device and is transported to the tail of the ignition tube 11. Finally, the gasification device product and the burner material are mixed at the tail of the ignition tube 11 and injected into the boiler furnace. By adjusting the positions of the external secondary air duct 17 and the internal secondary air duct 16, sufficient oxygen is provided to the burner, and the unit load is gradually reduced from 50% to 35% of the rated load, achieving efficient and stable combustion of fuel at the tail of the ignition tube 11.

[0036] When the unit load is less than 35% of the rated load, the boiler is shut down entirely, and the gasification-combustion integrated burner takes shutdown protection measures. During shutdown protection, the gasification device is shut down first, and the hot secondary air is used to purge the residual coal powder in the gasification device. Then, the coal powder feed rate of the burner is gradually reduced hourly, and the coal powder pipeline line 5 is purged. During the shutdown process, attention should be paid to controlling the overall process to avoid mechanical damage caused by thermal expansion due to a large loss of heat in the boiler furnace. Example

[0037] When the unit starts up in a cold state with low oil consumption, and the unit load increases from 0% to 50%, the specific operating conditions of a single gasification-combustion integrated burner based on 50% rated load are as follows:

[0038] When the unit's 50% rated load exceeds the unit's load, the gasification unit and burner must operate as a whole. Before cold start, the gasification unit needs to be preheated at 700℃-900℃ for 1-2 hours. The opening of the pulverized coal regulating valve 22 is set to 30%-100%, and the pulverized coal feed rate is adjusted to 0-1 hour, allowing pulverized coal to enter the gasification unit from the pulverized coal pipe 5. During this period, the pulverized coal regulating valve 22 regulates the pulverized coal feed rate. The thermocouple 8 detects the temperature and feeds it back to the external controller, which then adjusts the... The furnace temperature is between 750℃ and 1000℃. Pressure measuring element 9 measures the pressure and sends feedback to the external controller. The external controller adjusts the furnace pressure to -0.2KPa to +0.5KPa, opens the hot secondary air regulating valve 23 to 0-10%, allowing hot secondary air to enter the gasification device for regulation. This regulates the combustion conditions of the gasification device. After the temperature of the gasification device stabilizes, the No. 1 oil gun 3 is closed and withdrawn, setting the boiler furnace feed rate to 105t / h-120t / h, enabling the unit to operate stably under low load (35% of rated load). After a period of time, the boiler was then subjected to load increase operation. During the load increase operation, the oil guns of the four ordinary burners in the middle layer of the front / rear wall were opened, and the diesel fuel consumption was controlled at 300 kg / h / burner. The corresponding coal mills were started, and the boiler's three coal mills and twelve burners were put into operation. That is, the boiler's furnace feed rate was gradually increased from 105 t / h-120 t / h to 180 t / h-190 t / h. During the process, the ratio of pulverized coal to air in the gasification device was adjusted to 0.5-4 to control the degree of pulverized coal gasification. A portion of the pulverized coal entered from the main pulverized coal pipe 14. The coal powder is fed into the cyclone device 10, while the air damper 24 controls the mixing ratio of coal powder and air in the main coal powder pipe 14. The cyclone device 10 enables the coal powder and air to be efficiently mixed around the ignition pipe 11. Another part of the coal powder generates hot coal gas and hot coal powder in the gasification device and is transported to the tail of the ignition pipe 11. Finally, the gasification device product and the burner material are mixed at the tail of the ignition pipe 11 and injected into the furnace of the boiler. By adjusting the positions of the external secondary air pipe 17 and the internal secondary air pipe 16, sufficient oxygen is provided to the burner, so that the unit can operate stably at 50% rated load. Example

[0039] The unit operates stably at 35% of its rated load under low-load conditions, with a 15% increase in deep peak-shaving capacity. When the rated load of the unit decreases from 50% to 35%, the specific operating conditions of a single integrated gasification-combustion burner, based on dispatch instructions, are as follows:

[0040] When the dispatching command is greater than or equal to 50% of the unit's rated load, the gasification unit does not participate in operation, and only the burner participates in operation;

[0041] When the dispatch command is less than 50% of the unit's rated load, the gasification unit and the burner must operate together. First, the gasification unit needs to be preheated at a temperature of 700℃-900℃ for 1-2 hours. The opening of the pulverized coal regulating valve 22 is set to 30%-100%, and the pulverized coal feed rate is adjusted to 0-1 hour, allowing pulverized coal to enter the gasification unit from the pulverized coal pipe 5. During this period, the pulverized coal regulating valve 22 adjusts the pulverized coal feed rate, and the thermocouple 8 detects the temperature and feeds it back to the external controller. The external controller adjusts the furnace temperature to 750℃-1000℃. Pressure measuring element 9 measures the pressure and sends feedback to the external controller, which adjusts the furnace pressure to -0.2KPa to +0.5KPa. The hot secondary air regulating valve 23 is opened at an opening degree of 0-10%, allowing hot secondary air to enter the gasification device for regulation, thus adjusting the combustion conditions of the gasification device. After the temperature of the gasification device stabilizes, the No. 1 oil gun 3 is closed and withdrawn. During the load reduction process, the four ordinary burners on the lower layer of the front / rear wall are first shut down. The corresponding coal mills ensure the boiler operates with 3 coal mills and 12 burners. Subsequently, the boiler undergoes a load reduction operation, gradually decreasing the furnace feed rate from 170-186 t / h to 100-116 t / h. During this process, the coal-to-air ratio in the gasification unit is adjusted to 0.5-4 to control the degree of coal gasification. A portion of the coal enters the cyclone device 10 from the main coal pulverizer pipe 14, while the air distribution baffle 24 controls the flow of coal within the main coal pulverizer pipe 14. The mixing ratio of pulverized coal and air is controlled by the cyclone device 10, which enables efficient mixing of pulverized coal and air around the ignition tube 11. Another portion of the pulverized coal generates hot coal gas and hot pulverized coal in the gasification device and is transported to the tail of the ignition tube 11. Finally, the gasification device product and the burner material are mixed at the tail of the ignition tube 11 and injected into the furnace of the boiler. By adjusting the positions of the external secondary air duct 17 and the internal secondary air duct 16, sufficient oxygen is provided to the burner, and the unit load is gradually reduced from 50% to 35% of the rated load, achieving stable operation.

[0042] When the unit load is less than 35% of the rated load, the boiler is shut down as a whole. The gasification-combustion integrated burner takes shutdown protection measures. During shutdown protection, the gasification device is shut down first, and the hot secondary air is used to purge the residual coal powder in the hot gasification device. Then, the coal powder feed rate of the burner is gradually reduced hourly, and the coal powder pipeline is purged. During the shutdown process, attention should be paid to controlling the overall process to avoid mechanical damage caused by thermal expansion due to a large loss of heat in the boiler furnace. Example

[0043] When the unit starts up in a cold state with low oil consumption, and the unit load increases from 0% to 50%, the specific operating conditions of a single gasification-combustion integrated burner based on 50% rated load are as follows:

[0044] When the unit's 50% rated load exceeds the unit's load, the gasification unit and burner must operate as a whole. Before cold start, the gasification unit needs to be preheated at 750℃-950℃ for 1-2 hours. The opening of the pulverized coal regulating valve 22 is set to 30%-100%, and the pulverized coal feed rate is adjusted to 0-1 t / h, allowing pulverized coal to enter the gasification unit from the pulverized coal pipe 5. During this period, the pulverized coal regulating valve 22 adjusts the pulverized coal feed rate. The thermocouple 8 detects the temperature and feeds it back to the external controller, which then adjusts the... When the furnace temperature is between 750℃ and 1000℃, pressure measuring element 9 measures the pressure and sends feedback to the external controller. The external controller adjusts the furnace pressure to -0.2KPa to +0.5KPa, opens the hot secondary air regulating valve 23 to 0-10%, allowing hot secondary air to enter the gasification device for regulation. After the temperature of the gasification device stabilizes, the combustion conditions of the gasification device are adjusted, and the No. 1 oil gun 3 is closed and withdrawn. That is, the furnace feed rate of the boiler is set to 98t / h-114t / h, so that the unit can operate stably under low load (35% of rated load) for a period of time. Time was then allocated for boiler load increase. During the load increase, the oil guns of the four ordinary burners on the lower layer of the front / rear wall were opened, and the diesel fuel consumption was controlled at 300 kg / h per burner. The corresponding coal mills were started, and the boiler's three coal mills and twelve burners were in operation. That is, the boiler's furnace feed rate gradually increased from 98 t / h-114 t / h to 170 t / h-186 t / h. During the process, the ratio of pulverized coal to hot secondary air in the gasification unit was adjusted to 0.5-4 to control the degree of pulverized coal gasification. A portion of the pulverized coal entered the main pulverized coal pipe 14. Inside the cyclone device 10, the air damper 24 simultaneously controls the mixing ratio of pulverized coal and air in the main pulverized coal pipe 14. The cyclone device 10 enables efficient mixing of pulverized coal and air around the ignition pipe 11. Another part of the pulverized coal generates hot coal gas and hot pulverized coal in the gasification device and is transported to the tail of the ignition pipe 11. Finally, the gasification device product and the burner material are mixed and burned at the tail of the ignition pipe 11 and injected into the furnace of the boiler. By adjusting the positions of the external secondary air pipe 17 and the internal secondary air pipe 16, sufficient oxygen is provided to the burner, enabling the unit to operate stably at 50% rated load.

[0045] The foregoing has shown and described the main features and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A gasification-combustion integrated burner for wide-load peak shaving, characterized in that: The device includes a gasification device and a burner. The gasification device includes a nozzle (1) and a furnace body (2). A first oil gun (3) and a first ignition gun (4) are fixedly installed at the inlet of the nozzle (1). A pulverized coal pipe (5) and a hot secondary air pipe (6) are arranged sequentially from left to right on the nozzle (1). A hand hole (7), a thermocouple (8) and a pressure measuring element (9) are fixedly installed sequentially from left to right on the furnace body (2). The thermocouple (8) and the pressure measuring element (9) are used to detect the temperature and pressure inside the furnace body (2) in real time. The end of the nozzle (1) is connected to the front end of the furnace body (2) through a flange. The end of the furnace body (2) is connected to the burner through a flange. A swirl device (10) is arranged in the middle of the burner.

2. The gasification-combustion integrated burner for wide-load peak shaving according to claim 1, characterized in that: The burner includes an ignition tube (11) and a housing (12). The end of the furnace body (2) is fixedly connected to the ignition tube (11) via a flange. The ignition tube (11) passes through a sleeve (13) and enters the bend of the main pulverized coal pipe (14). The ignition tube (11) can be axially extended and retracted within the sleeve (13) to adapt to the flame length requirements under different combustion conditions and extends to the tail of the main pulverized coal pipe (14). The sleeve (13) is welded to the bend of the main pulverized coal pipe (14). The ignition tube (11) passes through a swirl device. The swirling device (10) is fixedly installed between the main pulverized coal pipe (14) and the ignition pipe (11), and at the center of the burner. The second oil gun (26) and the second ignition gun (27) are fixedly installed on the housing (12). The lower part of the housing (12) is fixedly installed with a fire observation hole (15). An inner secondary air pipe (16) is provided on the outer wall of the main pulverized coal pipe (14). An outer secondary air pipe (17) is provided on the outer side of the inner secondary air pipe (16). The end of the burner is set as a bell mouth (18).

3. The gasification-combustion integrated burner for wide-load peak shaving according to claim 2, characterized in that: The swirling device (10) includes an outer ring support (19), which is a tapered multi-ring design and is fixedly installed inside the burner. An inner ring sleeve (20) is fixedly installed inside the outer ring support (19). Three blades (21) are fixedly installed between the inner ring sleeve (20) and the outer ring support (19). The three blades (21) are evenly distributed in a ring array with the inner ring sleeve (20) as the center. The inner ring sleeve (20) is slidably connected to the ignition tube (11).

4. The gasification-combustion integrated burner for wide-load peak shaving according to claim 3, characterized in that: The ratio of the outer diameter of the ignition tube (11) to the outer diameter of the outer ring support (19) is set to 0.30-0.55, and the ratio of the inner diameter to the outer diameter of the ignition tube (11) is set to 0.50-0.

83.

5. The gasification-combustion integrated burner for wide-load peak shaving according to claim 1, characterized in that: A pulverized coal regulating valve (22) is installed on the pulverized coal pipe (5).

6. The gasification-combustion integrated burner for wide-load peak shaving according to claim 1, characterized in that: A regulating valve (23) for the secondary hot air duct (6) is fixedly installed on the secondary hot air duct (6).

7. A gasification-combustion integrated burner for wide-load peak shaving according to claim 2, characterized in that: The housing (12) is provided with an air distribution baffle (24), which is used to control the air volume and adjust the mixing ratio of coal powder and air in the burner. A flame detector (25) is fixedly installed inside the housing (12) to monitor the combustion state of the flame in the burner.

8. The gasification-combustion integrated burner for wide-load peak shaving according to claim 1, characterized in that: Both the thermocouple (8) and the pressure measuring element (9) are connected to an external controller. The temperature of the thermocouple (8) is fed back to the external controller, which controls the temperature inside the furnace. The pressure of the pressure measuring element (9) is fed back to the external controller, which regulates the pressure inside the furnace.

9. A gasification-combustion integrated burner for wide-load peak shaving according to claim 2, characterized in that: The main pulverized coal pipe (14) is L-shaped. The vertical pipe of the main pulverized coal pipe (14) is fixedly installed outside the shell (12). The horizontal pipe of the main pulverized coal pipe (14) enters the interior of the shell (12) and extends to the end of the shell (12). A 90° elbow is provided between the vertical pipe and the horizontal pipe. The 90° elbow is fixedly connected to the vertical pipe and the horizontal pipe through a flange.

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