A control system for steam load of garbage pyrolysis power generation system

Abstract

The present invention belongs to the technical field of waste pyrolysis, and specifically relates to a control system for steam load of a waste pyrolysis power generation system. The controller is connected to the motor inverter of the waste feeding unit, the motor inverter of the return unit, the bottom combustion control regulating valve, the side combustion control regulating valve, the steam flow regulating valve, and the desalted water pump motor inverter; the waste feeding unit is connected to the pyrolysis unit; the return unit is connected to the pyrolysis unit and the solid heat carrier furnace; the wind chamber is connected to the solid heat carrier furnace; the flue gas dust removal is connected to the pyrolysis unit, the solid heat carrier furnace, and the steam superheater; the water-cooled wall is connected to the desalted water pump and the solid heat carrier furnace; the bottom pyrolysis gas combustion control regulating valve is connected to the bottom burner, the pyrolysis gas buffer and the pyrolysis unit; the side pyrolysis gas combustion control regulating valve is connected to the side burner, the pyrolysis gas buffer and the pyrolysis unit. It not only meets the high-temperature and high-pressure steam requirements of the steam power generation system, but also is suitable for the system characteristics of the waste pyrolysis process.

Description

Technical Field

[0001] The invention belongs to the technical field of garbage pyrolysis, and in particular relates to a control system for steam load of a garbage pyrolysis power generation system. Background Art

[0002] The current principle of thermal power generation system is to convert chemical energy into high-temperature and high-pressure steam, which is then used to drive the generator set to generate electricity through a steam turbine. The power generation load of the generator set is adjusted by adjusting the operation of the steam engine and the generator set. At the same time, the power generation load is adjusted to be consistent with the electricity load.

[0003] The regulation of steam load in the waste pyrolysis power generation process requires not only stable regulation of steam load, but also continuous stability of the waste pyrolysis process. The waste pyrolysis power generation process system heats the solid heat carrier to 600-850°C through a solid heat carrier furnace, and then fully mixes with organic waste in the pyrolysis unit in anoxic conditions to produce a pyrolysis reaction, producing combustible pyrolysis gas and residual carbon. The pyrolysis gas is purified by the purification system and then burned in the solid heat carrier furnace. The high-temperature flue gas (850-1100°C) generated is heated by the waste heat recovery boiler to produce saturated steam to realize the steam power generation process. Compared with the incineration power generation process, the waste pyrolysis power generation process system is more complex, has higher power generation efficiency, better emission indicators, and does not produce dioxins during the entire process.

[0004] The current mainstream of the waste-to-energy market is through waste incineration, that is, after simple treatment of the waste, it is transported to a waste incinerator or incineration device, and the steam generated is raised to high-temperature and high-pressure superheated steam through heat exchange between the high-temperature flue gas and the waste heat boiler to generate electricity. The pressure and temperature regulation of the steam volume in the waste incineration power generation process is achieved by adjusting the delivery volume according to the calorific value of the waste, proportionally adjusting the air volume, and correcting the air volume twice through the oxygen volume, thereby achieving the regulation of the high-temperature flue gas temperature and flow rate, thereby achieving the regulation of the steam pressure and temperature. The steam regulation of the waste incineration power generation process cannot achieve good regulation and correction of the waste pyrolysis process and the solid heat carrier circulation system.

[0005] In order to ensure the stable operation of the garbage pyrolysis power generation system, it is necessary to develop a reliable and stable steam load regulation system to meet the needs of the garbage pyrolysis process steam power generation system, and to ensure the stable operation of the garbage pyrolysis system. The steam load regulation of the garbage pyrolysis process is achieved by adjusting the garbage feeding unit, return unit, solid heat carrier furnace pyrolysis gas combustion load, desalted water pump, etc. Summary of the invention

[0006] The object of the present invention is to provide a control system for the steam load of a garbage pyrolysis power generation system, which not only meets the high-temperature and high-pressure steam requirements of the steam power generation system, but is also suitable for the system characteristics of the garbage pyrolysis process.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A control system for steam load of a garbage pyrolysis power generation system, comprising a controller, a garbage feeding unit, a motor inverter, a bottom combustion control regulating valve, a side combustion control regulating valve, a steam flow regulating valve, a desalted water pump motor inverter, a return unit motor inverter, a pyrolysis unit, a solid heat carrier furnace unit, a wind chamber, a water-cooled wall, a flue gas dust removal, a steam superheater, a pyrolysis gas buffer, a bottom burner, and a side burner; the controller and the garbage feeding unit motor inverter, the return unit motor inverter, the bottom combustion control regulating valve, and the side burner The control regulating valve, steam flow regulating valve, and desalted water pump motor inverter are connected; the garbage feeding unit is connected to the pyrolysis unit; the return unit is connected to the pyrolysis unit and the solid heat carrier furnace; the wind chamber is connected to the solid heat carrier furnace; the flue gas dust removal is connected to the pyrolysis unit, the solid heat carrier furnace, and the steam superheater; the water-cooled wall is connected to the desalted water pump and the solid heat carrier furnace; the bottom pyrolysis gas combustion control regulating valve is connected to the bottom burner, the pyrolysis gas buffer and the pyrolysis unit; the side pyrolysis gas combustion control regulating valve is connected to the side burner, the pyrolysis gas buffer and the pyrolysis unit.

[0009] The garbage feeder unit transports the garbage to the pyrolysis unit, and at the same time, the flue gas dust removal transports the high-temperature solid heat carrier to the pyrolysis unit. The garbage and the high-temperature solid heat carrier undergo pyrolysis reaction to produce pyrolysis gas and residual carbon; the pyrolysis gas enters the pyrolysis gas buffer and is finally burned in the bottom burner and side burner of the solid heat carrier furnace unit, and the residual carbon and solid heat carrier are transported to the solid heat carrier furnace unit through the return unit for combustion and heating cycle; the outer wall of the solid heat carrier furnace unit is a water-cooled wall, which produces saturated steam; the high-temperature flue gas generated by the solid heat carrier furnace unit enters the steam superheater after the flue gas dust removal to secondary heat the saturated steam to produce high-temperature and high-pressure superheated steam; the high-temperature and high-pressure superheated steam enters the power generation unit after meeting the conditions.

[0010] The steam pipeline of the steam superheater is provided with a steam pressure measuring point PT1 and a steam flow measuring point FT1, a solid heat carrier furnace furnace temperature measuring point TT1, and a water-cooled wall water level measuring point LT1, and the signals are connected to the controller.

[0011] The controller controls the motor inverter of the garbage feeding unit, the motor inverter of the return unit, the gas regulating valve FV1 for bottom combustion control, the gas regulating valve FV2 for side combustion control, the motor inverter of the desalted water pump, and the steam flow regulating valve FV3 at the steam superheater outlet.

[0012] The control loop includes feed amount loop control, return amount loop control, bottom combustion load control, side combustion load control, water level loop control, furnace temperature loop control, steam pressure loop control, and steam flow loop control.

[0013] The control method is as follows:

[0014] 1) Adjust the garbage feeding amount by adjusting the frequency of the motor inverter of the garbage feeding unit;

[0015] 2) The return amount is adjusted by adjusting the frequency of the return motor inverter of the return unit. When the return amount increases, the flow rate of the solid heat carrier and the residual carbon transported to the solid heat carrier will increase. At this time, the bottom and side pyrolysis gas combustion loads are increased by opening the fuel regulating valves FV1 and FV2 of the combustion control, thereby increasing the circulation amount of the solid heat carrier and increasing the furnace temperature; when the return amount decreases, the bottom pyrolysis gas combustion load and the side pyrolysis gas load are reduced by closing the fuel regulating valves FV1 and FV2 of the combustion control, thereby reducing the circulation amount of the solid heat carrier and reducing the furnace temperature;

[0016] 3) The water-cooled wall liquid level is adjusted by adjusting the frequency of the desalted water pump motor inverter. Increasing the motor frequency will increase the water-cooled wall liquid level and increase the saturated steam generation. Reducing the motor frequency will reduce the water-cooled wall liquid level, reduce the heat exchange area, and reduce the saturated steam generation. The higher the furnace temperature TT1, the higher the saturated steam generation. The lower the furnace temperature TT1, the lower the saturated steam generation.

[0017] 4) The high-temperature flue gas generated by the combustion of the solid heat carrier furnace is used to secondary heat the saturated steam through the steam superheater. The steam pressure is regulated as the main circuit and the steam flow is regulated as the secondary circuit. When the steam pressure is low, the steam flow regulating valve FV3 is set to the lowest power generation unit load opening, and the garbage feed amount is increased through step 1), and the return amount, pyrolysis gas combustion load, and water-cooled wall liquid level are increased through steps 2) and 3). When the steam pressure reaches the rated value and continues to rise, the steam flow is increased to stabilize the steam pressure, so as to increase the loop load of the steam pressure and flow. When the steam pressure is high and the steam flow reaches or exceeds the rated value and the steam loop load needs to be reduced, the garbage feed amount is reduced through step 1), and the return amount, pyrolysis gas combustion load, and water-cooled wall liquid level are reduced through steps 2) and 3). When the steam pressure drops below the rated value, the steam pressure is stabilized by closing the steam flow regulating valve FV3. When the steam pressure and steam flow are within the rated range, no adjustment is performed or fine-tuning is performed.

[0018] The beneficial effects achieved by the present invention are:

[0019] The control system of the present invention comprises a controller, a motor frequency converter of a garbage feeding unit, a bottom combustion control regulating valve, a bottom combustion control regulating valve, a side combustion control regulating valve, a steam flow regulating valve, a desalted water pump motor frequency converter, a return unit motor frequency converter, a pyrolysis unit, a solid heat carrier unit, a wind chamber, a water-cooled wall, a flue gas dust removal, a steam superheater, a pyrolysis gas buffer, a bottom burner and a side burner. The system regulation process is carried out in a passive manner by regulating the steam pressure as a main loop and the steam flow as a secondary loop. By regulating the frequency of the motor frequency converter of the garbage feeding unit and the frequency of the motor frequency converter of the return unit, and in coordination with regulating and controlling the solid heat carrier furnace pyrolysis gas combustion load fuel regulating valve and the frequency of the desalted water pump motor frequency converter, the load regulation of the steam pressure and flow of the garbage pyrolysis power generation system can be well achieved. At the same time, while adjusting the frequency of the motor frequency converter of the garbage feeding unit and the frequency of the motor frequency converter of the return unit, the circulation amount of the heat carrier is adjusted, and the complete pyrolysis of the domestic garbage can be stably achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a system structure diagram of the present invention. DETAILED DESCRIPTION

[0021] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1 As shown, the control system of the steam load of the garbage pyrolysis power generation system of the present invention includes a controller, a garbage feeding unit motor inverter, a bottom combustion control regulating valve, a side combustion control regulating valve, a steam flow regulating valve, a desalted water pump motor inverter, a return unit motor inverter, a pyrolysis unit, a solid heat carrier furnace unit, a wind chamber, a water-cooled wall, a flue gas dust removal, a steam superheater, a pyrolysis gas buffer, a bottom burner, and a side burner; the controller and the garbage feeding unit motor inverter, the return unit motor inverter, the bottom combustion control regulating valve, and the side The combustion control regulating valve, steam flow regulating valve, and desalted water pump motor inverter are connected; the garbage feeding unit is connected to the pyrolysis unit; the return unit is connected to the pyrolysis unit and the solid heat carrier furnace; the wind chamber is connected to the solid heat carrier furnace; the flue gas dust removal is connected to the pyrolysis unit, the solid heat carrier furnace, and the steam superheater; the water-cooled wall is connected to the desalted water pump and the solid heat carrier furnace; the bottom pyrolysis gas combustion control regulating valve is connected to the bottom burner, the pyrolysis gas buffer and the pyrolysis unit; the side pyrolysis gas combustion control regulating valve is connected to the side burner, the pyrolysis gas buffer and the pyrolysis unit.

[0023] The garbage feeder unit transports the garbage to the pyrolysis unit, and at the same time, the flue gas dust removal transports the high-temperature solid heat carrier to the pyrolysis unit. The garbage and the high-temperature solid heat carrier undergo pyrolysis reaction to produce pyrolysis gas and residual carbon; the pyrolysis gas enters the pyrolysis gas buffer and is finally burned in the bottom burner and side burner of the solid heat carrier furnace unit, and the residual carbon and solid heat carrier are transported to the solid heat carrier furnace unit through the return unit for combustion and heating cycle; the outer wall of the solid heat carrier furnace unit is a water-cooled wall, which produces saturated steam; the high-temperature flue gas generated by the solid heat carrier furnace unit enters the steam superheater after the flue gas dust removal, and the saturated steam is secondary heated and pressurized to produce high-temperature and high-pressure superheated steam; the high-temperature and high-pressure superheated steam enters the power generation unit after meeting the conditions.

[0024] The steam pipeline of the steam superheater is equipped with steam pressure measuring point PT1 and steam flow measuring point FT1, the solid heat carrier furnace furnace temperature measuring point TT1, and the water-cooled wall water level measuring point LT1 signals are connected to the controller.

[0025] The controller controls the motor inverter of the garbage feeding unit, the motor inverter of the return unit, the gas regulating valve FV1 for bottom combustion control, the gas regulating valve FV2 for side combustion control, the motor inverter of the desalted water pump, and the steam flow regulating valve FV3 at the steam superheater outlet.

[0026] The control loop of the garbage pyrolysis steam power generation system includes feed amount loop control, return amount loop control, bottom combustion load control, side combustion load control, water level loop control, furnace temperature loop control, steam pressure loop control, and steam flow loop control.

[0027] The control method is as follows:

[0028] 1) Adjust the garbage feeding amount by adjusting the frequency of the motor inverter of the garbage feeding unit;

[0029] 2) The return amount is adjusted by adjusting the frequency of the return motor inverter of the return unit. When the return amount increases, the flow rate of the solid heat carrier and the residual carbon transported to the solid heat carrier will increase. At this time, the bottom and side pyrolysis gas combustion loads are increased by opening the fuel regulating valves FV1 and FV2 of the combustion control, thereby increasing the circulation amount of the solid heat carrier and increasing the furnace temperature; when the return amount decreases, the bottom pyrolysis gas combustion load and the side pyrolysis gas load are reduced by closing the fuel regulating valves FV1 and FV2 of the combustion control, thereby reducing the circulation amount of the solid heat carrier and reducing the furnace temperature;

[0030] 3) The water-cooled wall liquid level is adjusted by adjusting the frequency of the desalted water pump motor inverter. Increasing the motor frequency will increase the water-cooled wall liquid level and increase the saturated steam generation. Reducing the motor frequency will reduce the water-cooled wall liquid level, reduce the heat exchange area, and reduce the saturated steam generation. The higher the furnace temperature TT1, the higher the saturated steam generation, and the lower the furnace temperature TT1, the lower the saturated steam generation.

[0031] 4) The high-temperature flue gas generated by the combustion of the solid heat carrier furnace is used to reheat the saturated steam through the steam superheater. The steam pressure is regulated as the main circuit and the steam flow rate is regulated as the secondary circuit. When the steam pressure is low, the steam flow regulating valve FV3 is set to the lowest power generation unit load opening, and the garbage feed amount is increased through step 1), and the return amount, pyrolysis gas combustion load, and water-cooled wall liquid level are increased through steps 2) and 3). When the steam pressure reaches the rated value and continues to rise, the steam flow rate is increased to stabilize the steam pressure and realize the increase of the circuit load of the steam pressure and flow rate; when the steam pressure is high and the steam flow rate reaches or exceeds the rated value and the steam circuit load needs to be reduced, the garbage feed amount is reduced through step 1), and the return amount, pyrolysis gas combustion load, and water-cooled wall liquid level are reduced through steps 2) and 3). When the steam pressure drops below the rated value, the steam pressure is stabilized by closing the steam flow regulating valve FV3; when the steam pressure and steam flow are within the rated range, no adjustment is made or fine-tuning is made.

[0032] The water-cooled wall of the solid heat carrier furnace produces saturated steam, which is exchanged with the high-temperature flue gas generated by the solid heat carrier furnace unit through the steam superheater to produce high-temperature and high-pressure superheated steam to meet the needs of the steam power generation unit. The steam pressure and flow cannot be adjusted quickly and independently, so the regulation method is that the steam pressure is the main regulation loop and the steam flow is the secondary regulation loop. The steam flow is passively regulated according to the result of steam pressure regulation. The steam load regulation of the garbage pyrolysis steam power generation system is system regulation, which is complex, linked and lagging. The specific control method is as follows:

[0033] 1) The waste pyrolysis process requires that the feed amount of the waste feeding unit should match the circulation amount of the high-temperature solid heat carrier to produce stable pyrolysis gas and residual carbon. The waste pyrolysis load adjustment is to increase the waste feed amount, which will increase the return amount and the pyrolysis gas combustion load of the solid heat carrier furnace accordingly; to reduce the waste pyrolysis load, the waste feed amount, the return amount and the pyrolysis gas combustion load of the solid heat carrier furnace will be reduced at the same time;

[0034] 2) The furnace temperature TT1 of the solid heat carrier furnace is related to the pyrolysis gas load and the return material amount (the return material contains residual carbon) of the solid heat carrier furnace. The greater the pyrolysis gas load and the greater the return material amount, the higher the furnace temperature TT1; otherwise, the lower it is.

[0035] 3) The amount of saturated steam generated is related to the water-cooled wall liquid level LT1 and the furnace temperature TT1 of the solid heat carrier furnace. The higher the water-cooled wall liquid level LT1 and the furnace temperature TT1, the higher the primary steam generation; otherwise, the lower;

[0036] 4) The pressure PT1 and flow rate FT1 of high-temperature and high-pressure superheated steam are related to the saturated steam generation and the solid heat carrier furnace load. The higher the saturated steam generation, the higher the solid heat carrier furnace pyrolysis gas combustion load and the return material volume, the higher the pressure PT1 and flow rate FT1 of high-temperature and high-pressure steam; otherwise, the lower;

[0037] 5) According to 1), 2), 3) and 4), the adjustment sequence for increasing the steam load of the garbage pyrolysis steam power generation system is: increase the motor inverter frequency of the garbage feeding unit → increase the motor inverter frequency of the return unit → open the pyrolysis gas combustion regulating valves FV1 and FV2 at the bottom and side of the solid heat carrier furnace unit → increase the desalted water pump motor inverter frequency → increase the steam flow regulating valve FV3 after the steam pressure rises; the adjustment sequence for reducing the steam load of the garbage pyrolysis steam power generation system is: reduce the motor inverter frequency of the garbage feeding unit → reduce the motor inverter frequency of the return unit → close the pyrolysis gas combustion load regulating valves FV1 and FV2 of the solid heat carrier furnace unit → reduce the desalted water pump motor inverter frequency → close the steam flow regulating valve FV3 after the steam pressure drops.

[0038] A control system for steam load of a garbage pyrolysis power generation system, comprising a controller, a garbage feeding unit, a motor inverter, a bottom combustion control regulating valve, a side combustion control regulating valve, a steam flow regulating valve, a desalted water pump motor inverter, a return unit motor inverter, a pyrolysis unit, a solid heat carrier furnace unit, a wind chamber, a water-cooled wall, a flue gas dust removal, a steam superheater, a pyrolysis gas buffer, a bottom burner, and a side burner; the controller and the garbage feeding unit motor inverter, the return unit motor inverter, the bottom combustion control regulating valve, and the side burner The control regulating valve, steam flow regulating valve, and desalted water pump motor inverter are connected; the garbage feeding unit is connected to the pyrolysis unit; the return unit is connected to the pyrolysis unit and the solid heat carrier furnace; the wind chamber is connected to the solid heat carrier furnace; the flue gas dust removal is connected to the pyrolysis unit, the solid heat carrier furnace, and the steam superheater; the water-cooled wall is connected to the desalted water pump and the solid heat carrier furnace; the bottom pyrolysis gas combustion control regulating valve is connected to the bottom burner, the pyrolysis gas buffer and the pyrolysis unit; the side pyrolysis gas combustion control regulating valve is connected to the side burner, the pyrolysis gas buffer and the pyrolysis unit.

[0039] The garbage feeder unit transports the garbage to the pyrolysis unit, and at the same time, the flue gas dust removal transports the high-temperature solid heat carrier to the pyrolysis unit. The garbage and the high-temperature solid heat carrier undergo pyrolysis reaction to produce pyrolysis gas and residual carbon; the pyrolysis gas enters the pyrolysis gas buffer and is finally burned in the bottom burner and side burner of the solid heat carrier furnace unit, and the residual carbon and solid heat carrier are transported to the solid heat carrier furnace unit through the return unit for combustion and heating cycle; the outer wall of the solid heat carrier furnace unit is a water-cooled wall, which produces saturated steam; the high-temperature flue gas generated by the solid heat carrier furnace unit enters the steam superheater after the flue gas dust removal to secondary heat the saturated steam to produce high-temperature and high-pressure superheated steam; the high-temperature and high-pressure superheated steam enters the power generation unit after meeting the conditions.

[0040] The steam pipeline of the steam superheater is provided with a steam pressure measuring point PT1 and a steam flow measuring point FT1, a solid heat carrier furnace furnace temperature measuring point TT1, and a water-cooled wall water level measuring point LT1, and the signals are connected to the controller.

[0041] The controller controls the motor inverter of the garbage feeding unit, the motor inverter of the return unit, the gas regulating valve FV1 for bottom combustion control, the gas regulating valve FV2 for side combustion control, the motor inverter of the desalted water pump, and the steam flow regulating valve FV3 at the steam superheater outlet.

[0042] The control loop includes feed amount loop control, return amount loop control, bottom combustion load control, side combustion load control, water level loop control, furnace temperature loop control, steam pressure loop control, and steam flow loop control.

[0043] The control method is as follows:

[0044] 1) Adjust the garbage feeding amount by adjusting the frequency of the motor inverter of the garbage feeding unit;

[0045] 2) The return amount is adjusted by adjusting the frequency of the return motor inverter of the return unit. When the return amount increases, the flow rate of the solid heat carrier and the residual carbon transported to the solid heat carrier will increase. At this time, the bottom and side pyrolysis gas combustion loads are increased by opening the fuel regulating valves FV1 and FV2 of the combustion control, thereby increasing the circulation amount of the solid heat carrier and increasing the furnace temperature; when the return amount decreases, the bottom pyrolysis gas combustion load and the side pyrolysis gas load are reduced by closing the fuel regulating valves FV1 and FV2 of the combustion control, thereby reducing the circulation amount of the solid heat carrier and reducing the furnace temperature;

[0046] 3) The water-cooled wall liquid level is adjusted by adjusting the frequency of the desalted water pump motor inverter. Increasing the motor frequency will increase the water-cooled wall liquid level and increase the saturated steam generation. Reducing the motor frequency will reduce the water-cooled wall liquid level, reduce the heat exchange area, and reduce the saturated steam generation. The higher the furnace temperature TT1, the higher the saturated steam generation. The lower the furnace temperature TT1, the lower the saturated steam generation.

[0047] 4) The high-temperature flue gas generated by the combustion of the solid heat carrier furnace is used to secondary heat the saturated steam through the steam superheater. The steam pressure is regulated as the main circuit and the steam flow is regulated as the secondary circuit. When the steam pressure is low, the steam flow regulating valve FV3 is set to the lowest power generation unit load opening, and the garbage feed amount is increased through step 1), and the return amount, pyrolysis gas combustion load, and water-cooled wall liquid level are increased through steps 2) and 3). When the steam pressure reaches the rated value and continues to rise, the steam flow is increased to stabilize the steam pressure, so as to increase the loop load of the steam pressure and flow. When the steam pressure is high and the steam flow reaches or exceeds the rated value and the steam loop load needs to be reduced, the garbage feed amount is reduced through step 1), and the return amount, pyrolysis gas combustion load, and water-cooled wall liquid level are reduced through steps 2) and 3). When the steam pressure drops below the rated value, the steam pressure is stabilized by closing the steam flow regulating valve FV3. When the steam pressure and steam flow are within the rated range, no adjustment is performed or fine-tuning is performed.

Claims

1. A control system for steam load of a garbage pyrolysis power generation system, characterized by: Including controller, garbage feeding unit motor inverter, bottom combustion control regulating valve, side combustion control regulating valve, steam flow regulating valve, desalted water pump motor inverter, return unit motor inverter, pyrolysis unit, solid heat carrier furnace unit, wind chamber, water-cooled wall, flue gas dust removal, steam superheater, pyrolysis gas buffer, bottom burner, side burner; controller and garbage feeding unit motor inverter, return unit motor inverter, bottom combustion control regulating valve, side combustion control regulating valve, steam The flow regulating valve is connected to the inverter of the desalted water pump motor; the garbage feeding unit is connected to the pyrolysis unit; the return unit is connected to the pyrolysis unit and the solid heat carrier furnace; the wind chamber is connected to the solid heat carrier furnace; the flue gas dust removal is connected to the pyrolysis unit, the solid heat carrier furnace, and the steam superheater; the water-cooled wall is connected to the desalted water pump and the solid heat carrier furnace; the bottom pyrolysis gas combustion control regulating valve is connected to the bottom burner, the pyrolysis gas buffer and the pyrolysis unit; the side pyrolysis gas combustion control regulating valve is connected to the side burner, the pyrolysis gas buffer and the pyrolysis The units are connected; the garbage feeding unit transports the garbage to the pyrolysis unit, and the flue gas dust removal transports the high-temperature solid heat carrier to the pyrolysis unit, and the garbage and the high-temperature solid heat carrier undergo pyrolysis reaction to produce pyrolysis gas and residual carbon; the pyrolysis gas enters the pyrolysis gas buffer and is finally burned in the bottom burner and the side burner of the solid heat carrier furnace unit, and the residual carbon and solid heat carrier are transported to the solid heat carrier furnace unit through the return unit for combustion and heating cycle; the outer wall of the solid heat carrier furnace unit is a water-cooled wall, and the water-cooled wall produces saturated steam; the high-temperature flue gas generated by the solid heat carrier furnace unit enters the steam superheater after the flue gas dust removal to perform secondary heating on the saturated steam to produce high-temperature and high-pressure superheated steam; the high-temperature and high-pressure superheated steam enters the power generation unit after meeting the conditions; the controller controls the motor inverter of the garbage feeding unit, the motor inverter of the return unit, the gas regulating valve FV1 controlled by the bottom combustion, the gas regulating valve FV2 controlled by the side combustion, the motor inverter of the desalted water pump, and the steam flow regulating valve FV3 at the steam superheater outlet.

2. The steam load control system of the garbage pyrolysis power generation system according to claim 1 is characterized by: The steam pipeline of the steam superheater is equipped with steam pressure measuring point PT1 and steam flow measuring point FT1, the solid heat carrier furnace furnace temperature measuring point TT1, and the water-cooled wall water level measuring point LT1 signals are connected to the controller.

3. The steam load control system of the garbage pyrolysis power generation system according to claim 1 is characterized by: The control method is as follows: 1) Adjust the garbage feeding amount by adjusting the frequency of the motor inverter of the garbage feeding unit; 2) The return amount is adjusted by adjusting the frequency of the return motor inverter of the return unit. When the return amount increases, the flow rate of the solid heat carrier and the residual carbon transported to the solid heat carrier will increase. At this time, the bottom and side pyrolysis gas combustion loads are increased by opening the fuel regulating valves FV1 and FV2 of the combustion control, thereby increasing the circulation amount of the solid heat carrier and increasing the furnace temperature; when the return amount decreases, the bottom pyrolysis gas combustion load and the side pyrolysis gas load are reduced by closing the fuel regulating valves FV1 and FV2 of the combustion control, thereby reducing the circulation amount of the solid heat carrier and reducing the furnace temperature; 3) The water-cooled wall liquid level is adjusted by adjusting the frequency of the desalted water pump motor inverter. Increasing the motor frequency will increase the water-cooled wall liquid level and increase the saturated steam generation. Reducing the motor frequency will reduce the water-cooled wall liquid level, reduce the heat exchange area, and reduce the saturated steam generation. The higher the furnace temperature TT1, the higher the saturated steam generation. The lower the furnace temperature TT1, the lower the saturated steam generation. 4) The high-temperature flue gas generated by the combustion of the solid heat carrier furnace is used to secondary heat the saturated steam through the steam superheater. The steam pressure is regulated as the main circuit and the steam flow is regulated as the secondary circuit. When the steam pressure is low, the steam flow regulating valve FV3 is set to the lowest power generation unit load opening, and the garbage feed amount is increased through step 1), and the return amount, pyrolysis gas combustion load, and water-cooled wall liquid level are increased through steps 2) and 3). When the steam pressure reaches the rated value and continues to rise, the steam flow is increased to stabilize the steam pressure, so as to increase the loop load of the steam pressure and flow. When the steam pressure is high and the steam flow reaches or exceeds the rated value and the steam loop load needs to be reduced, the garbage feed amount is reduced through step 1), and the return amount, pyrolysis gas combustion load, and water-cooled wall liquid level are reduced through steps 2) and 3). When the steam pressure drops below the rated value, the steam pressure is stabilized by closing the steam flow regulating valve FV3. When the steam pressure and steam flow are within the rated range, no adjustment is performed or fine-tuning is performed.

Images