Coupling power generation device

Abstract

The utility model relates to the technical field of thermal power generation, and provides a coupling power generation device. Comprising a coal-fired boiler, a generator set and a coal gasifier, the coal-fired boiler comprises a superheater and a reheater which are arranged in the boiler, an outlet of the superheater is connected with a first inlet of the generator set, an outlet of the reheater is connected with a second inlet of the generator set, and an inlet of the reheater is connected with a first outlet of the generator set and a steam outlet of the coal gasifier. And a second outlet of the generator set is connected with water inlet ends of the coal-fired boiler and the coal gasifier. High-temperature steam generated by the coal-fired boiler is directly supplied to the generator set to do work, effective utilization of heat energy of the coal-fired boiler is achieved, low-pressure steam of the first outlet of the generator set and the high-temperature steam generated by the coal gasifier are mixed and then enter the reheater to be reheated, and reutilization of waste heat steam of the coal gasifier is achieved. The existing equipment and resources are fully utilized, the system structure is simplified, the occupied area and the cost are reduced, and the complexity of maintenance and operation is reduced.

Description

Technical Field

[0001] This utility model relates to the field of thermal power generation technology, specifically to a coupling power generation device. Background Technology

[0002] Fluidized bed gasification technology, with its wide fuel adaptability and high heat and mass transfer efficiency, has become an ideal choice for processing complex fuels such as high-ash and high-ash-fusion-point coal, and has been widely used in industrial production. However, if the large amount of heat generated during the gasification process is not effectively managed and utilized, it will constitute a significant energy waste.

[0003] To avoid wasting heat generated during coal gasification, existing technologies commonly employ the method of adding waste heat recovery devices, such as waste heat boilers and heat exchangers. However, while these solutions improve energy efficiency to some extent, the newly added waste heat recovery devices occupy a large area and increase costs. Utility Model Content

[0004] In view of this, the present application provides a coupled power generation device that does not require additional waste heat recovery devices, has a small footprint, and is inexpensive.

[0005] This application provides a coupled power generation device, including a coal-fired boiler, a generator set, and a coal gasifier. The coal-fired boiler includes a superheater and a reheater disposed inside the furnace. The outlet of the superheater is connected to the first inlet of the generator set, the outlet of the reheater is connected to the second inlet of the generator set, the inlet of the reheater is connected to the first outlet of the generator set and the steam outlet of the coal gasifier, and the second outlet of the generator set is connected to the water inlet of the coal-fired boiler and the coal gasifier.

[0006] This application directly supplies high-temperature steam generated by a coal-fired boiler to a generator set to perform work, achieving efficient utilization of the boiler's thermal energy. The steam from the generator set's first outlet mixes with high-temperature steam generated by the gasifier and then enters a reheater for reheating, realizing the reuse of waste heat steam from the gasifier. This structure significantly improves energy efficiency without requiring a separate waste heat recovery device, thus avoiding additional land requirements and reducing equipment investment costs. This design not only fully utilizes existing equipment and resources but also simplifies the system structure, reduces maintenance and operational complexity, and further enhances the system's economy and practicality.

[0007] Preferably, the generator set includes a first cylinder, the inlet of the first cylinder being the first inlet of the generator set, and the outlet of the first cylinder being the first outlet of the generator set.

[0008] Preferably, the generator set includes a second cylinder, the inlet of the second cylinder being the second inlet of the generator set, and the outlet of the second cylinder being the second outlet of the generator set.

[0009] This application employs a generator set with a dual-cylinder structure, which can better match steam of different temperatures and pressure levels, thereby improving energy conversion efficiency. The first cylinder handles high-pressure, high-temperature steam, while the second cylinder handles medium-pressure steam after reheating. This staged utilization method not only improves power generation efficiency but also effectively extends equipment lifespan and reduces maintenance costs.

[0010] Preferably, the steam pressure at the inlet of the first cylinder is greater than the steam pressure at the inlet of the second cylinder.

[0011] This application ensures that high-pressure steam is preferentially utilized by setting the steam pressure at the inlet of the first cylinder to be higher than that of the second cylinder, thereby maximizing its energy contribution. This design helps improve the energy conversion rate of the entire power generation process, while reducing energy losses caused by steam pressure mismatch and enhancing the overall performance of the system.

[0012] More preferably, it also includes a coal bunker, with the ash outlet of the coal gasification furnace connected to the inlet of the coal bunker, and the outlet of the coal bunker connected to the feed inlet of the coal-fired boiler.

[0013] This application allows the ash and slag produced by the coal gasification furnace to be fed back into the coal-fired boiler for combustion, thereby realizing the reuse of ash and slag, reducing waste emissions, and lowering environmental pollution.

[0014] More preferably, it also includes a gasification ash conveying device, the inlet of which is connected to the ash outlet of the coal gasification furnace, and the outlet of which is connected to the inlet of the coal bunker.

[0015] This application ensures the continuity and reliability of ash conveying by setting up a gasification ash conveying device, thereby improving the operational stability of the system.

[0016] More preferably, the system also includes a deaerator, a first feedwater pump, and a second feedwater pump. The second outlet of the generator set is connected to the inlet of the deaerator, the outlet of the deaerator is connected to the inlets of the first and second feedwater pumps, the outlet of the first feedwater pump is connected to the water inlet of the coal-fired boiler, and the outlet of the second feedwater pump is connected to the water inlet of the coal gasifier.

[0017] The deaerator in this application effectively removes dissolved oxygen from the feedwater, preventing internal corrosion and extending equipment life. By installing two independent feedwater pumps to supply water to the coal-fired boiler and gasifier respectively, a stable water supply is ensured for both, avoiding operational instability caused by water pressure fluctuations and improving system reliability and safety. Furthermore, connecting the generator set's second outlet to the deaerator, the first feedwater pump, and the second feedwater pump eliminates the need for an external water source to supply water to the coal-fired boiler and gasifier, further reducing the number of devices and improving water resource utilization.

[0018] More preferably, it also includes a waste steam treatment device, wherein the second outlet of the generator set is connected to the inlet of the waste steam treatment device, and the outlet of the waste steam treatment device is connected to the inlet of the deaerator.

[0019] This application employs a waste steam treatment unit, which effectively recovers the low-grade steam generated during power generation. The waste steam is condensed into water by a condenser and then pumped back to the deaerator, achieving water resource recycling. This design not only saves water resources but also reduces system heat loss and improves energy efficiency.

[0020] Preferably, the waste steam treatment device includes a condenser and a condensate pump, the outlet of the second feedwater pump is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the condensate pump, and the outlet of the condensate pump is connected to the inlet of the deaerator.

[0021] More preferably, it also includes a reheater steam inlet pipe, a coal gasifier steam pipe, and a generator set first outlet pipe. The inlet of the reheater is connected to one end of the reheater steam inlet pipe, and the other end of the reheater steam inlet pipe is connected to one end of the coal gasifier steam pipe and one end of the generator set first outlet pipe. The other end of the coal gasifier steam pipe is connected to the steam outlet of the coal gasifier. The coal gasifier steam pipe is equipped with a pressure regulating valve and an electric isolation valve.

[0022] This application achieves mixed reheating of steam generated by the coal gasifier and steam from the first outlet of the generator set by setting up a reheater inlet pipe and a coal gasifier steam pipe, thereby improving the quality of the steam entering the second cylinder. The configuration of the pressure regulating valve and the electric isolation valve ensures the stability and safety of steam delivery, avoids system failures caused by pressure fluctuations, and improves the system's operating efficiency and reliability.

[0023] The coupled power generation device provided in this application embodiment comprises a coal-fired boiler, a generator set, and a coal gasification furnace. The coal-fired boiler includes a superheater and a reheater installed within the furnace. The outlet of the superheater is connected to the first inlet of the generator set, and the outlet of the reheater is connected to the second inlet of the generator set. The inlet of the reheater is connected to the first outlet of the generator set and the steam outlet of the coal gasification furnace. The second outlet of the generator set is connected to the water inlet of both the coal-fired boiler and the coal gasification furnace. The high-temperature steam generated by the coal-fired boiler is directly supplied to the generator set to perform work, achieving efficient utilization of the boiler's thermal energy. Meanwhile, the low-pressure steam from the first outlet of the generator set mixes with the high-temperature steam generated by the coal gasification furnace and enters the reheater for reheating, realizing the reuse of waste heat steam from the coal gasification furnace. This structure significantly improves energy utilization without requiring a separate waste heat recovery device, thus avoiding additional land requirements and reducing equipment investment costs. This design not only fully utilizes existing equipment and resources but also simplifies the system structure, reduces maintenance and operational complexity, and further enhances the system's economy and practicality. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a coupling power generation device provided in one embodiment of this application.

[0026] In the diagram: 1-Coal-fired boiler, 101-Superheater, 102-Reheater, 3-Generator set, 301-First cylinder, 302-Second cylinder, 4-Coal gasifier, 5-Coal bunker, 6-Waste steam treatment device, 7-Deaerator, 8-First feedwater pump, 9-Second feedwater pump, 10-Gasification ash conveying device, 12-Reheater steam inlet pipe, 13-Coal gasifier steam pipe, 14-Generator set first outlet pipe, 15-Electric isolation valve. Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0028] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0029] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0031] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized. "A plurality" means "two or more."

[0032] Figure 1 A preferred embodiment of this application is shown. Figure 1 A schematic diagram of a coupled power generation device according to the first embodiment of this application is shown. For ease of explanation, only the parts related to this embodiment are shown, and the details are as follows:

[0033] It includes a coal-fired boiler 1, a generator set 3, and a coal gasifier 4. The coal-fired boiler 1 includes a superheater 101 and a reheater 102 installed inside the furnace. The outlet of the superheater 101 is connected to the first inlet of the generator set 3, the outlet of the reheater 102 is connected to the second inlet of the generator set 3, the inlet of the reheater 102 is connected to the first outlet of the generator set 3 and the steam outlet of the coal gasifier 4, and the second outlet of the generator set 3 is connected to the water inlet of the coal-fired boiler 1 and the coal gasifier 4.

[0034] In applications, superheater 101 can be installed at the top of the boiler, above the combustion chamber or near the flue gas outlet. Superheater 101 is used to further heat the saturated steam generated from the steam drum, raising its temperature above the saturation temperature to become superheated steam. Reheater 102 can be installed downstream of superheater 101, in the low-temperature flue gas region of the boiler. In large coal-fired boilers, reheater 102 is arranged in the tail flue. Reheater 102 is used to mix and reheat the low-pressure steam discharged from the first outlet of generator set 3 with the high-temperature steam generated by gasifier 4, increasing the steam temperature and pressure, ensuring higher quality steam entering the second cylinder 302, thereby improving power generation efficiency.

[0035] In the application, the high-temperature, high-pressure steam generated by the superheater 101 of the coal-fired boiler 1 is transported to the first inlet of the generator set 3 through the main steam pipeline 2. The inlet of the reheater 102 is connected to the first outlet of the generator set 3 and the steam outlet of the coal gasifier 4, mixing the low-pressure steam with the high-temperature steam (medium-pressure saturated steam) generated by the coal gasifier 4 and then reheating it before transporting it to the second inlet of the generator set 3 through the reheater outlet pipeline. The second outlet of the generator set 3 is connected to the water inlet of the coal-fired boiler 1 and the coal gasifier 4 through the return water pipeline, forming a closed water circulation system.

[0036] In the application, the combustion of coal in the coal-fired boiler 1 produces high-temperature flue gas, which heats the steam to a high-temperature and high-pressure state through the superheater 101. The resulting superheated steam is then transported to the first cylinder 301 of the generator set 3 through the main steam pipeline 2, driving the turbine to perform work. The low-pressure steam discharged from the first cylinder 301 mixes with the high-temperature steam generated by the gasifier 4 in the reheater 102 and is reheated to form steam with even higher temperature and pressure, which then enters the second cylinder 302 of the generator set 3 to continue performing work. The low-temperature and low-pressure steam after completing its work returns to the inlet of the coal-fired boiler 1 and the gasifier 4 through the return water pipeline, forming a cycle.

[0037] This embodiment of the application directly supplies high-temperature steam generated by a coal-fired boiler to a generator set to perform work, achieving efficient utilization of the boiler's thermal energy. The low-pressure steam from the generator set's first outlet mixes with high-temperature steam generated by the gasifier and enters a reheater for reheating, realizing the reuse of waste heat steam from the gasifier. This structure significantly improves energy efficiency without requiring a separate waste heat recovery device, thus avoiding additional land occupation and reducing equipment investment costs. This design not only fully utilizes existing equipment and resources but also simplifies the system structure, reduces maintenance and operational complexity, and further enhances the system's economy and practicality.

[0038] In one embodiment, the generator set 3 includes a first cylinder 301, the inlet of the first cylinder 301 being the first inlet of the generator set 3, and the outlet of the first cylinder 301 being the first outlet of the generator set 3.

[0039] In one embodiment, the generator set 3 includes a second cylinder 302, the inlet of the second cylinder 302 being the second inlet of the generator set 3, and the outlet of the second cylinder 302 being the second outlet of the generator set 3.

[0040] In one embodiment, the steam pressure at the inlet of the first cylinder 301 is greater than the steam pressure at the inlet of the second cylinder 302.

[0041] In the application, generator set 3 includes a first cylinder 301 and a second cylinder 302. The inlet of the first cylinder 301 is the first inlet of generator set 3, and the outlet of the first cylinder 301 is the first outlet of generator set 3. The inlet of the second cylinder 302 is the second inlet of generator set 3, and the outlet of the second cylinder 302 is the second outlet of generator set 3. The first inlet of generator set 3 is connected to the outlet of superheater 101 of coal-fired boiler 1 through the main steam pipeline 2. The outlet of the first cylinder 301 is connected to the inlet of reheater 102 through reheater inlet pipe 12. The second inlet of generator set 3 is connected to the outlet of reheater 102 through reheater outlet pipe. The outlet of the second cylinder 302 is connected to the water inlet of coal-fired boiler 1 and coal gasifier 4 through return water pipeline. Generator set 3 can be a high-efficiency steam turbine generator set. The first cylinder 301 can be a high-pressure cylinder, such as a high-pressure impulse cylinder. The second cylinder 302 can be a medium- or low-pressure cylinder, such as a medium- or low-pressure reaction cylinder.

[0042] In the application, the high-temperature, high-pressure steam generated by the superheater 101 enters the first cylinder 301 through the main steam pipe 2, driving the turbine to perform work. The low-pressure steam discharged from the first cylinder 301 enters the reheater 102 through the reheater inlet pipe 12, mixes with the high-temperature steam generated by the coal gasifier 4, and is reheated to form steam with even higher temperature and pressure. The high-temperature, high-pressure steam generated by the reheater 102 enters the second cylinder 302 through the reheater outlet pipe, continuing to drive the turbine to perform work. The low-temperature, low-pressure steam after completing its work returns to the inlet of the coal-fired boiler 1 and the coal gasifier 4 through the return water pipe, forming a cycle.

[0043] This application's embodiment employs a generator set with a dual-cylinder structure, which can better match steam of different temperatures and pressure levels, improving energy conversion efficiency. The first cylinder handles high-pressure, high-temperature steam, while the second cylinder handles medium-pressure steam after reheating. This staged utilization not only improves power generation efficiency but also effectively extends equipment lifespan and reduces maintenance costs. By designing the first cylinder as a high-pressure cylinder and the second cylinder as a low-pressure cylinder, the generator set can efficiently utilize steam of different pressure levels, achieving multi-level energy utilization. This design not only improves the overall thermal efficiency of the system but also reduces energy waste, enhancing power generation efficiency and economy. Simultaneously, the rational configuration of connections between components ensures stable system operation and efficient operation.

[0044] In one embodiment, the system also includes a coal bunker 5, with the ash outlet of the coal gasification furnace 4 connected to the inlet of the coal bunker 5, and the outlet of the coal bunker 5 connected to the feed inlet of the coal-fired boiler 1.

[0045] In application, the ash outlet of the coal gasifier 4 is connected to the inlet of the coal bunker 5 through the gasification ash conveying device 10, and the outlet of the coal bunker 5 is connected to the feed inlet of the coal-fired boiler 1 through a conveyor belt or screw conveyor.

[0046] In application, coal bunker 5 can be a high-efficiency coal storage bunker, such as the MCW series coal bunker; gasification ash conveying device 10 can be a screw conveyor or belt conveyor, such as the DX type screw conveyor.

[0047] The ash produced by the coal gasifier 4 in this embodiment is fed into the coal bunker 5 through the gasification ash conveying device 10. After being mixed with raw coal, it is fed into the feed inlet of the coal-fired boiler 1 through a conveyor belt or screw conveyor, so as to realize the reuse of ash and improve energy utilization efficiency.

[0048] In one embodiment, the device further includes a gasification ash conveying device 10, the inlet of which is connected to the ash outlet of the coal gasifier 4, and the outlet of which is connected to the inlet of the coal bunker 5.

[0049] In application, the inlet of the gasification ash conveying device 10 is connected to the ash outlet of the coal gasifier 4 via a pipeline, and the outlet of the gasification ash conveying device 10 is connected to the inlet of the coal bunker 5 via a pipeline or conveyor belt. The ash produced by the coal gasifier 4 is fed into the coal bunker 5 through the gasification ash conveying device 10, mixed with raw coal, and then fed into the feed inlet of the coal-fired boiler 1, realizing the reuse of ash and reducing waste emissions.

[0050] The embodiments of this application ensure the continuity and reliability of ash conveying by setting up a gasification ash conveying device, thereby improving the operational stability of the system.

[0051] In one embodiment, the system further includes a deaerator 7, a first feedwater pump 8, and a second feedwater pump 9. The second outlet of the generator set 3 is connected to the inlet of the deaerator 7, the outlet of the deaerator 7 is connected to the inlets of the first feedwater pump 8 and the second feedwater pump 9, the outlet of the first feedwater pump 8 is connected to the water inlet of the coal-fired boiler 1, and the outlet of the second feedwater pump 9 is connected to the water inlet of the coal gasifier 4.

[0052] In the application, the second outlet of generator set 3 is connected to the inlet of deaerator 7 via a return water pipeline. The outlet of deaerator 7 is connected to the inlets of the first feedwater pump 8 and the second feedwater pump 9 via pipelines. The outlet of the first feedwater pump 8 is connected to the inlet of the coal-fired boiler 1 via a pipeline, and the outlet of the second feedwater pump 9 is connected to the inlet of the coal gasifier 4 via a pipeline. The low-temperature, low-pressure steam discharged from the second outlet of generator set 3 enters deaerator 7 through the return water pipeline to remove dissolved oxygen and other gases from the water and prevent corrosion. The deaerated water is pressurized by the first feedwater pump 8 and the second feedwater pump 9 and sent to the inlets of the coal-fired boiler 1 and the coal gasifier 4 respectively, forming a closed water circulation system.

[0053] In application, deaerator 7 can be a high-efficiency deaerator, such as the HWT series deaerator; the first feed water pump 8 and the second feed water pump 9 can be high-efficiency centrifugal pumps, such as the KSB series centrifugal pumps.

[0054] The deaerator in this embodiment effectively removes dissolved oxygen from the feedwater, preventing internal corrosion and extending equipment life. By using two independent feedwater pumps to supply water to the coal-fired boiler and gasifier respectively, a stable water supply is ensured for both, avoiding operational instability caused by water pressure fluctuations and improving system reliability and safety. Furthermore, connecting the generator set's second outlet to the deaerator, the first feedwater pump, and the second feedwater pump eliminates the need for an external water source to supply water to the coal-fired boiler and gasifier, further reducing the number of devices and improving water resource utilization.

[0055] In one embodiment, the system further includes a waste steam treatment device 6, with the second outlet of the generator set 3 connected to the inlet of the waste steam treatment device 6, and the outlet of the waste steam treatment device 6 connected to the inlet of the deaerator 7.

[0056] In the application, the second outlet of generator set 3 is connected to the inlet of the condenser via a pipeline, the outlet of the condenser is connected to the inlet of the condensate pump via a pipeline, and the outlet of the condensate pump is connected to the inlet of the deaerator 7 via a pipeline. The low-temperature, low-pressure steam (exhaust steam) discharged from the second outlet of generator set 3 enters the exhaust steam treatment unit 6 via a pipeline. The main function of the exhaust steam treatment unit 6 is to condense this exhaust steam into water for recycling.

[0057] In one embodiment, the waste steam treatment unit 6 includes a condenser and a condensate pump, the outlet of the second feedwater pump 9 is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the condensate pump, and the outlet of the condensate pump is connected to the inlet of the deaerator 7.

[0058] In this application, after the exhaust steam enters the exhaust steam treatment unit 6, it exchanges heat with the cooling water through a condenser, condensing the exhaust steam into condensate. The condenser is typically a high-efficiency heat exchanger that can quickly transfer the heat of the exhaust steam to the cooling water. The condensed condensate is pressurized by a condensate pump and sent back to the deaerator 7 through pipelines. The deaerator 7 is responsible for removing dissolved oxygen and other gases from the water, preventing these gases from reacting with metal surfaces at high temperatures and causing corrosion. The deaerated water is pressurized by the first feedwater pump 8 and the second feedwater pump 9, and sent to the inlet of the coal-fired boiler 1 and the coal gasifier 4, respectively, forming a closed water circulation system. A high-efficiency condenser, such as the NQD series condenser, can be selected, characterized by high heat exchange efficiency, compact structure, and convenient maintenance. A high-efficiency centrifugal pump, such as the KSB series centrifugal pump, can be selected, characterized by large flow rate, high head, and stable operation.

[0059] In this embodiment, by setting up a waste steam treatment device 6, the low-temperature, low-pressure steam (waste steam) discharged from the second outlet of the generator set 3 is effectively recovered and utilized, which not only reduces the waste of water resources but also improves the overall thermal efficiency of the system. The efficient condensation and condensate recovery and utilization of the waste steam treatment device 6 ensure the stability and economy of the system operation, while also reducing the impact on the environment.

[0060] In one embodiment, the system further includes a reheater steam inlet pipe 12, a gasifier steam pipe 13, and a generator set first outlet pipe 14. The inlet of the reheater 102 is connected to one end of the reheater steam inlet pipe 12, and the other end of the reheater steam inlet pipe 12 is connected to one end of the gasifier steam pipe 13 and the generator set first outlet pipe 14. The other end of the gasifier steam pipe 13 is connected to the steam outlet of the gasifier 4. The gasifier steam pipe 13 is equipped with a pressure regulating valve and an electric isolation valve 15.

[0061] In the application, the inlet of reheater 102 is connected to one end of gasifier steam pipe 13 and generator set first outlet pipe 14 via reheater steam inlet pipe 12. The other end of gasifier steam pipe 13 is connected to the steam outlet of gasifier 4. Gasifier steam pipe 13 is equipped with a pressure regulating valve and an electric isolation valve 15. Low-pressure steam discharged from the first outlet of generator set 3 and high-temperature steam generated by gasifier 4 merge through gasifier steam pipe 13 and generator set first outlet pipe 14, then enter reheater steam inlet pipe 12, and then enter reheater 102 for reheating.

[0062] In application, to ensure that the steam pressure entering the reheater 102 is consistent with the exhaust pressure of the high-pressure cylinder of the steam turbine, a pressure regulating valve is installed on the steam pipe 13 of the gasifier to regulate the saturated steam pressure. When the boiler starts up, closing the shut-off valve on the steam pipe 13 of the gasifier ensures normal boiler operation. Specifically: during normal system operation, the pressure regulating valve adjusts the saturated steam pressure generated by the gasifier 4 to maintain consistency with the exhaust pressure of the high-pressure cylinder of the steam turbine. The electrically operated isolation valve 15 is in the open state to ensure that saturated steam and low-pressure steam can smoothly enter the reheater 102. During the initial system startup, the electrically operated isolation valve 15 can be closed first, and then opened again after all parts of the system have preheated to ensure a smooth system startup. When the system shuts down, the electrically operated isolation valve 15 can be closed in advance to prevent steam backflow and protect system equipment. In case of system failure or emergency, the electrically operated isolation valve 15 can be quickly closed to cut off the steam supply, prevent the accident from escalating, and ensure system safety.

[0063] This application achieves mixed reheating of steam generated by the coal gasifier and the first outlet steam of the generator set by setting up a reheater inlet pipe and a coal gasifier steam pipe, thereby improving the quality of the steam entering the second cylinder. The configuration of pressure regulating valves and electrically operated isolation valves ensures the stability and safety of steam delivery, avoids system failures caused by pressure fluctuations, and improves the system's operating efficiency and reliability. By installing pressure regulating valves and electrically operated isolation valves on the coal gasification saturated steam pipeline, the steam pressure can be effectively regulated and controlled, ensuring stable steam pressure entering the reheater. This not only helps improve the system's operating efficiency and safety but also ensures stable operation during startup, shutdown, and emergency situations. The reheater inlet pipe is made of high-temperature and high-pressure resistant stainless steel, further guaranteeing the system's reliability and long-term operational stability.

[0064] In one embodiment, an electrically operated isolation valve is provided on the outlet pipe of the reheater 102.

[0065] In application, during normal system operation, the electrically operated isolation valve is in the open position, ensuring that the high-temperature, high-pressure steam generated by the reheater 102 can smoothly enter the second cylinder 302 of the generator set 3 to continue performing work. During system startup or shutdown, the steam flow can be controlled by opening and closing the electrically operated isolation valve. For example, during initial system startup, the electrically operated isolation valve can be closed first, and then opened after all parts of the system have preheated to ensure a smooth startup. During system shutdown, the electrically operated isolation valve can be closed in advance to prevent steam backflow and protect system equipment. In case of system failure or emergency, the electrically operated isolation valve can be quickly closed to cut off the steam supply, prevent the accident from escalating, and ensure system safety. High-efficiency and reliable electrically operated isolation valves, such as the Z41H-16C type, can be selected. These valves are characterized by flexible operation, fast response, good sealing performance, and suitability for high-temperature and high-pressure environments.

[0066] In one embodiment, the carbon content of the ash residue produced by the coal gasification furnace 4 is greater than 15%.

[0067] In application, the coal gasifier 4 gasifies coal during operation, producing syngas and ash. Since the gasification efficiency of the coal gasifier 4 is not 100%, some unburned carbon remains in the ash. The ash produced by the coal gasifier 4 has a carbon content greater than 15%, meaning it still contains a significant amount of unburned carbon and has a high calorific value. The ash produced by the coal gasifier 4 is fed into the coal bunker 5 via the gasification ash conveying device 10, mixed with raw coal, and then fed into the feed inlet of the coal-fired boiler 1, achieving ash reuse. Burning the high-carbon ash in the coal-fired boiler 1 further recovers heat and improves energy efficiency. Simultaneously, this reduces ash emissions and mitigates environmental pollution.

[0068] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A coupling power generation device, characterized in that: The system includes a coal-fired boiler (1), a generator set (3), and a coal gasifier (4). The coal-fired boiler (1) includes a superheater (101) and a reheater (102) installed inside the furnace. The outlet of the superheater (101) is connected to the first inlet of the generator set (3), the outlet of the reheater (102) is connected to the second inlet of the generator set (3), the inlet of the reheater (102) is connected to the first outlet of the generator set (3) and the steam outlet of the coal gasifier (4), and the second outlet of the generator set (3) is connected to the water inlet of the coal-fired boiler (1) and the coal gasifier (4).

2. The coupling power generation device according to claim 1, characterized in that: The generator set (3) includes a first cylinder (301), the inlet of the first cylinder (301) is the first inlet of the generator set (3), and the outlet of the first cylinder (301) is the first outlet of the generator set (3).

3. The coupling power generation device according to claim 2, characterized in that: The generator set (3) includes a second cylinder (302), the inlet of the second cylinder (302) is the second inlet of the generator set (3), and the outlet of the second cylinder (302) is the second outlet of the generator set (3).

4. The coupling power generation device according to claim 3, characterized in that: The steam pressure at the inlet of the first cylinder (301) is greater than the steam pressure at the inlet of the second cylinder (302).

5. The coupling power generation device according to claim 1, characterized in that: It also includes a coal bunker (5), the ash outlet of the coal gasification furnace (4) is connected to the inlet of the coal bunker (5), and the outlet of the coal bunker (5) is connected to the feed inlet of the coal-fired boiler (1).

6. The coupling power generation device according to claim 5, characterized in that: It also includes a gasification ash conveying device (10), the inlet of which is connected to the ash outlet of the coal gasification furnace (4), and the outlet of which is connected to the inlet of the coal bunker (5).

7. The coupling power generation device according to claim 1, characterized in that: It also includes a deaerator (7), a first feed water pump (8) and a second feed water pump (9). The second outlet of the generator set (3) is connected to the inlet of the deaerator (7). The outlet of the deaerator (7) is connected to the inlet of the first feed water pump (8) and the second feed water pump (9). The outlet of the first feed water pump (8) is connected to the water inlet of the coal-fired boiler (1). The outlet of the second feed water pump (9) is connected to the water inlet of the coal gasifier (4).

8. The coupling power generation device according to claim 7, characterized in that: It also includes a waste steam treatment device (6), the second outlet of the generator set (3) is connected to the inlet of the waste steam treatment device (6), and the outlet of the waste steam treatment device (6) is connected to the inlet of the deaerator (7).

9. The coupling power generation device according to claim 8, characterized in that: The waste steam treatment device (6) includes a condenser and a condensate pump. The second outlet of the generator set (3) is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the condensate pump, and the outlet of the condensate pump is connected to the inlet of the deaerator (7).

10. The coupling power generation device according to claim 1, characterized in that: It also includes a reheater steam inlet pipe (12), a coal gasifier steam pipe (13), and a generator set first outlet pipe (14). The inlet of the reheater (102) is connected to one end of the reheater steam inlet pipe (12), and the other end of the reheater steam inlet pipe (12) is connected to one end of the coal gasifier steam pipe (13) and the generator set first outlet pipe (14). The other end of the coal gasifier steam pipe (13) is connected to the steam outlet of the coal gasifier (4). The coal gasifier steam pipe (13) is equipped with a pressure regulating valve and an electric isolation valve (15).

Images