Efficient energy-saving system of waste incineration power plant

Abstract

The invention relates to an efficient energy-saving system of a waste incineration power plant, which comprises a boiler, a steam turbine, a power generator, a return pipeline, a deaerator, a first steam extraction assembly, a second steam extraction assembly and a system heat exchanger, the steam inlet end of the first steam extraction assembly is communicated with the steam extraction opening of the steam turbine, and the steam outlet end of the first steam extraction assembly is communicated with the steam inlet end of the deaerator; the second steam extraction assembly comprises a steam supply pipe and a lithium bromide heat pump, the steam supply pipe is communicated with a steam extraction opening of the steam turbine and the lithium bromide heat pump, the lithium bromide heat pump is provided with a heating end and a refrigerating end, and the heating end of the lithium bromide heat pump is connected with the backflow pipeline; steam in a steam turbine is pumped into a deaerator through an arranged first steam extraction assembly, heat energy needed by deaeration work of the deaerator is provided, the steam in the steam turbine is pumped into a lithium bromide heat pump through a steam conveying pipe so as to drive the lithium bromide heat pump to work, the heating end of the lithium bromide heat pump is used for heating steam and liquid in a backflow pipeline, and the heating end of the lithium bromide heat pump is used for heating the steam and the liquid in the backflow pipeline. The refrigerating end is connected with the system heat exchanger and provides refrigerants for operation of the whole plant area.

Description

Technical Field

[0001] The invention relates to the technical field of waste incineration power generation, and in particular to a high-efficiency energy-saving system for a waste incineration power plant. Background Art

[0002] Waste incineration power generation mainly uses the heat energy generated by the incineration of urban domestic waste to heat the boiler. The water in the boiler forms superheated steam at a certain temperature and pressure and is sent to the steam turbine generator set, which then performs work to generate electricity.

[0003] For example, the patent with application number CN202220733485.5 proposes a power generation system based on a heat recovery coke oven, which includes a desalted water tank, a deaerator, a coke oven waste heat boiler, a bypass condenser, a condensing steam turbine, a generator and a condenser; the desalted water tank is connected to the deaerator pipeline, the deaerator is connected to the coke oven waste heat boiler pipeline, the coke oven waste heat boiler is connected to the condensing steam turbine pipeline, and the condensing steam turbine is connected to the generator; the generator is connected to the condenser pipeline, the condenser is connected to the desalted water tank pipeline; the condensing steam turbine is connected to the deaerator pipeline; the pipeline connecting the coke oven waste heat boiler and the condensing steam turbine is provided with a bypass connected to the bypass condenser, and the bypass condenser is connected to the deaerator pipeline.

[0004] However, existing waste incineration systems require high electricity consumption to operate, resulting in low net power generation efficiency. Summary of the invention

[0005] In view of this, it is necessary to provide a high-efficiency energy-saving system for a waste incineration power plant to solve the problem that the existing waste incineration system requires high power consumption and thus has low net power generation efficiency.

[0006] The present invention provides a high-efficiency energy-saving system for a garbage incineration power plant, comprising a boiler, a steam turbine, a generator, a return pipeline, a deaerator, a first steam extraction component, a second steam extraction component and a system heat exchanger, wherein the steam turbine is connected to the steam outlet end of the boiler, the generator is connected to the output shaft of the steam turbine, the steam inlet end of the return pipeline is connected to the steam outlet end of the steam turbine, the steam inlet end of the deaerator is connected to the steam outlet end of the return pipeline, and the steam outlet end of the deaerator is connected to the boiler, the steam inlet end of the first steam extraction component is connected to the steam outlet end of the steam turbine, and the steam outlet end of the deaerator is connected to the boiler. The steam extraction port is connected, and the steam outlet end of the first steam extraction component is connected with the steam inlet end of the deaerator, so as to transport steam to the deaerator to provide heat energy for the deoxygenation work of the deaerator. The second steam extraction component includes a steam supply pipe and a lithium bromide heat pump. The steam supply pipe connects the steam extraction port of the steam turbine and the lithium bromide heat pump, so as to transport steam to the lithium bromide heat pump to drive the lithium bromide heat pump to operate. The lithium bromide heat pump has a heating end and a cooling end. The heating end of the lithium bromide heat pump is connected to the reflux pipeline to heat the steam and liquid therein.

[0007] Furthermore, the reflux pipeline includes an exhaust pipe, a condenser and a steam seal heater. The exhaust pipe connects the steam inlet end of the condenser and the steam outlet end of the steam turbine to condense the steam exhausted by the steam turbine into condensed water. The liquid outlet end of the condenser is connected to the steam seal heater. The water outlet end of the steam seal heater passes through the lithium bromide heat pump and is connected to the deaerator. The steam seal heater and the lithium bromide heat pump heat the condensed water in turn.

[0008] Furthermore, the return pipeline also includes a return pipe, and the return pipe is connected to the exhaust end of the steam seal heater and the steam inlet end of the condenser.

[0009] Furthermore, it also includes a condensate pump installed between the condenser and the steam seal heater.

[0010] Furthermore, the first steam extraction assembly includes a connecting pipe, and the connecting pipe connects the steam extraction port of the steam turbine and the deaerator.

[0011] Furthermore, it also includes the third steam extraction component, which has a heat exchange chamber connected to the air inlet end of the boiler, and heat is exchanged between the heat exchange chamber and the steam outlet end of the boiler and the steam extraction port of the turbine.

[0012] Furthermore, the third steam extraction assembly includes a steam air preheater, a first steam extraction pipe and a second steam extraction pipe, the first steam extraction pipe is connected to the steam outlet end of the boiler and the deaerator, the second steam extraction pipe is connected to the steam extraction port of the steam turbine and the deaerator, the first steam extraction pipe and the second steam extraction pipe both pass through the heat exchange chamber of the steam air preheater, and the heat exchange chamber of the steam air preheater is connected to the air inlet end of the boiler.

[0013] Furthermore, the steam turbine is provided with a first steam extraction port and a second steam extraction port in sequence along the flow direction of steam therein, the second steam extraction pipe is connected to the first steam extraction port of the steam turbine, and the first steam extraction assembly and the steam supply pipe are both connected to the second steam extraction port of the steam turbine.

[0014] Furthermore, the system heat exchanger includes a distribution room heat exchanger.

[0015] Furthermore, it also includes a feed water pump installed between the deaerator and the boiler.

[0016] Compared with the prior art, the hot steam generated in the boiler enters the steam turbine to perform work, so as to drive the engine to generate electricity. At the same time, the return pipeline recovers the steam that has done work in the steam turbine and returns it to the boiler through the deaerator. In the above process, the steam in the steam turbine can be pumped into the deaerator through the first steam extraction component, so as to provide the required heat energy for the deoxygenation work of the deaerator and avoid the need for additional power to heat the water vapor inside the deaerator. At the same time, the steam in the steam turbine can be pumped into the lithium bromide heat pump through the steam delivery pipe through the second air extraction component to drive the lithium bromide heat pump to work. The lithium bromide heat pump has a heating end and a cooling end. The heating end is connected to the return pipeline to heat the steam and liquid in the return pipeline, and the cooling end is connected to the system heat exchanger to provide refrigerant for the operation of the entire plant, effectively reducing the power consumption required for the operation of the power plant and improving the net power generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the overall structure of the high-efficiency energy-saving system for a waste incineration power plant provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0019] It should be noted that the net power generation efficiency of the power plant is the net power generated by deducting the power required for the operation of the power plant from the actual power generation of the generator 300. Since various equipment in the power plant requires electricity during operation, the net power generation efficiency of the power plant is low. Based on this, the present invention provides a high-efficiency energy-saving system for a waste incineration power plant to solve the above problem.

[0020] like Figure 1As shown, a high-efficiency energy-saving system for a waste incineration power plant includes a boiler 100, a steam turbine 200, a generator 300, a return line 440, a deaerator 500, a first steam extraction component 600, a second steam extraction component 700 and a system heat exchanger 800, wherein the steam turbine 200 is connected to the steam outlet of the boiler 100, the generator 300 is connected to the output shaft of the steam turbine 200, the steam inlet end of the return line 440 is connected to the steam outlet of the steam turbine 200, the steam inlet end of the deaerator 500 is connected to the steam outlet end of the return line 440, and the steam outlet end of the deaerator 500 is connected to the boiler 100, and the steam inlet end of the first steam extraction component 600 is connected to the steam outlet end of the steam turbine 200. The end is connected to the steam extraction port of the steam turbine 200, and the steam outlet end of the first steam extraction component 600 is connected to the steam inlet end of the deaerator 500, so as to transport steam to the deaerator 500 to provide heat energy for the deoxygenation work of the deaerator 500. The second steam extraction component 700 includes a steam supply pipe 710 and a lithium bromide heat pump 720. The steam supply pipe 710 connects the steam extraction port of the steam turbine 200 and the lithium bromide heat pump 720, so as to transport steam to the lithium bromide heat pump 720 to drive the lithium bromide heat pump 720 to operate. The lithium bromide heat pump 720 has a heating end and a cooling end. The heating end of the lithium bromide heat pump 720 is connected to the reflux pipeline 440 to heat the steam and liquid therein.

[0021] During implementation, the hot steam generated in the boiler 100 enters the steam turbine 200 to perform work, so as to drive the engine to generate electricity. At the same time, the return line 440 recovers the steam that has completed work in the steam turbine 200 and returns it to the boiler 100 through the deaerator 500. In the above process, the steam in the steam turbine 200 can be extracted into the deaerator 500 through the first steam extraction component 600, so as to provide the required heat energy for the deoxidation work of the deaerator 500, thereby avoiding the need to heat the water vapor inside the deaerator 500 with additional power. At the same time, through the second exhaust assembly, the steam in the turbine 200 is extracted to the lithium bromide heat pump 720 through the steam delivery pipe 710 to drive the lithium bromide heat pump 720 to work, wherein the lithium bromide heat pump 720 has a heating end and a cooling end, the heating end is connected to the return pipeline 440, for heating the steam and liquid in the return pipeline 440, and the cooling end is connected to the system heat exchanger 800, providing refrigerant for the operation of the entire plant, effectively reducing the power consumption required for the operation of the power plant and improving the net power generation efficiency.

[0022] The boiler 100 in this embodiment is a structure for boiling water to generate hot steam.

[0023] The steam turbine 200 and the generator 300 in this embodiment cooperate to realize power generation under the action of steam. Specifically, steam with a certain pressure and temperature enters the steam turbine 200, flows through the nozzle and expands in the nozzle to obtain high-speed flow. This high-speed flow of steam then impacts the blades of the steam turbine 200, causing the blades to drive the rotor to rotate, thereby outputting mechanical energy. Since the generator 300 is connected to the output shaft of the steam turbine 200, power generation is realized.

[0024] The return line 440 in this embodiment is used to receive the steam exhausted by the steam turbine 200 and return it to the boiler 100 .

[0025] In one embodiment, the reflux pipeline 440 includes an exhaust pipe 410, a condenser 420 and a steam seal heater 430. The exhaust pipe 410 connects the steam inlet end of the condenser 420 and the steam outlet end of the steam turbine 200 to condense the steam exhausted from the steam turbine 200 into condensed water. The liquid outlet end of the condenser 420 is connected to the steam seal heater 430. The water outlet end of the steam seal heater 430 passes through the lithium bromide heat pump 720 and is connected to the deaerator 500. The steam seal heater 430 and the lithium bromide heat pump 720 heat the condensed water in turn.

[0026] The return line 440 further includes a return pipe, which connects the exhaust end of the steam seal heater 430 and the steam inlet end of the condenser 420 .

[0027] It also includes a condensate pump installed between the condenser 420 and the steam seal heater 430.

[0028] The steam outlet end of the deaerator 500 in this embodiment is connected to the boiler 100, and it promotes the release of oxygen in the water body by heating the water body, thereby preventing the water body returning to the boiler 100 from containing too much water vapor.

[0029] It also includes a feed water pump installed between the deaerator 500 and the boiler 100.

[0030] The heat generation method of the deaerator 500 of a traditional power plant is electric heat. The present application introduces steam in the steam turbine 200 to heat the deaerator 500. The present application is implemented through the first steam extraction component 600. Specifically, the steam inlet end of the first steam extraction component 600 is connected to the steam extraction port of the steam turbine 200, and the steam outlet end of the first steam extraction component 600 is connected to the steam inlet end of the deaerator 500, so as to transport steam to the deaerator 500 to provide heat energy for the deoxidation work of the deaerator 500.

[0031] In one embodiment, the first steam extraction assembly 600 includes a connecting pipe connecting the steam extraction port of the steam turbine 200 and the deaerator 500 .

[0032] Since the power plant has a demand for cooling in the distribution room, during operation and other locations during operation, the present application solves the above-mentioned problem by setting up a second steam extraction component 700. Specifically, the second steam extraction component 700 includes a steam supply pipe 710 and a lithium bromide heat pump 720. The steam supply pipe 710 connects the steam extraction port of the steam turbine 200 and the lithium bromide heat pump 720 to transport steam to the lithium bromide heat pump 720 to drive the lithium bromide heat pump 720 to operate. The lithium bromide heat pump 720 has a heating end and a cooling end. The heating end of the lithium bromide heat pump 720 is connected to the return line 440 to heat the steam and liquid therein.

[0033] The third steam extraction component 900 in this embodiment has a heat exchange chamber connected to the air inlet end of the boiler 100 , and heat is exchanged between the heat exchange chamber and the steam outlet end of the boiler 100 and the steam extraction port of the steam turbine 200 .

[0034] In one embodiment, the third steam extraction component 900 includes a steam air preheater 910, a first steam extraction pipe 920 and a second steam extraction pipe 930. The first steam extraction pipe 920 connects the steam outlet end of the boiler 100 and the deaerator 500, and the second steam extraction pipe 930 connects the steam extraction port of the turbine 200 and the deaerator 500. The first steam extraction pipe 920 and the second steam extraction pipe 930 both pass through the heat exchange chamber of the steam air preheater 910, and the heat exchange chamber of the steam air preheater 910 is connected to the air inlet end of the boiler 100.

[0035] The steam turbine 200 in this embodiment is provided with a first steam extraction port and a second steam extraction port in sequence along the flow direction of steam therein, the second steam extraction pipe 930 is connected to the first steam extraction port of the steam turbine 200, and the first steam extraction assembly 600 and the steam supply pipe 710 are both connected to the second steam extraction port of the steam turbine 200.

[0036] In one embodiment, the system heat exchanger 800 comprises a switch room heat exchanger.

[0037] Workflow:.

[0038] Compared with the prior art: the hot steam generated in the boiler 100 enters the steam turbine 200 to do work, so as to drive the engine to generate electricity. At the same time, the return line 440 recovers the steam that has done work in the steam turbine 200 and returns it to the boiler 100 through the deaerator 500. In the above process, the steam in the steam turbine 200 can be extracted into the deaerator 500 through the first steam extraction component 600, so as to provide the required heat energy for the deoxidation work of the deaerator 500, thereby avoiding the need for additional power supply to heat the deaerator 500. At the same time, through the second exhaust assembly, the steam in the turbine 200 is extracted to the lithium bromide heat pump 720 through the steam delivery pipe 710 to drive the lithium bromide heat pump 720 to work, wherein the lithium bromide heat pump 720 has a heating end and a cooling end, the heating end is connected to the return line 440, for heating the steam and liquid in the return line 440, and the cooling end is connected to the system heat exchanger 800, which provides refrigerant for the operation of the entire plant, effectively reducing the power consumption required for the operation of the power plant and improving the net power generation efficiency.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A high-efficiency energy-saving system for a waste incineration power plant, characterized in that: include: boiler; a steam turbine connected to the steam outlet of the boiler; a generator connected to an output shaft of the steam turbine; a return pipeline, the steam inlet end of which is connected to the steam outlet end of the steam turbine; a deaerator, the steam inlet end of which is connected to the steam outlet end of the reflux pipeline, and the steam outlet end of the deaerator is connected to the boiler; A first steam extraction component, whose steam inlet end is connected to the steam extraction port of the steam turbine, and whose steam outlet end is connected to the steam inlet end of the deaerator, for conveying steam to the deaerator to provide heat energy for the deoxidation work of the deaerator; A second steam extraction component, comprising a steam delivery pipe and a lithium bromide heat pump, wherein the steam delivery pipe is connected to the steam extraction port of the steam turbine and the lithium bromide heat pump, and is used to deliver steam to the lithium bromide heat pump to drive the lithium bromide heat pump to work, wherein the lithium bromide heat pump has a heating end and a cooling end, and the heating end of the lithium bromide heat pump is connected to the reflux pipeline, and is used to heat the steam and liquid therein; A system heat exchanger is connected to the refrigeration end of the lithium bromide heat pump.

2. The high-efficiency energy-saving system for waste incineration power plants according to claim 1 is characterized in that: The reflux pipeline includes an exhaust pipe, a condenser and a steam seal heater. The exhaust pipe connects the steam inlet end of the condenser and the steam outlet end of the steam turbine to condense the steam exhausted by the steam turbine into condensed water. The liquid outlet end of the condenser is connected to the steam seal heater. The water outlet end of the steam seal heater passes through the lithium bromide heat pump and is connected to the deaerator. The steam seal heater and the lithium bromide heat pump heat the condensed water in turn.

3. The high-efficiency energy-saving system for waste incineration power plants according to claim 2 is characterized in that: The return pipeline also includes a return pipe, which is connected to the exhaust end of the steam seal heater and the steam inlet end of the condenser.

4. The high-efficiency energy-saving system for waste incineration power plants according to claim 2 is characterized in that: It also includes a condensate pump installed between the condenser and the steam seal heater.

5. The high-efficiency energy-saving system for waste incineration power plants according to claim 1 is characterized in that: The first steam extraction component includes a connecting pipe, and the connecting pipe is connected with the steam extraction port of the steam turbine and the deaerator.

6. The high-efficiency energy-saving system for waste incineration power plants according to claim 1, characterized in that: It also includes the third steam extraction component, which has a heat exchange chamber connected to the air inlet end of the boiler, and heat is exchanged between the heat exchange chamber and the steam outlet end of the boiler and the steam extraction port of the steam turbine.

7. The high-efficiency energy-saving system for waste incineration power plants according to claim 6, characterized in that: The third steam extraction assembly includes a steam air preheater, a first steam extraction pipe and a second steam extraction pipe. The first steam extraction pipe is connected to the steam outlet of the boiler and the deaerator, and the second steam extraction pipe is connected to the steam extraction port of the steam turbine and the deaerator. The first steam extraction pipe and the second steam extraction pipe both pass through the heat exchange cavity of the steam air preheater, and the heat exchange cavity of the steam air preheater is connected to the air inlet end of the boiler.

8. The high-efficiency energy-saving system for waste incineration power plants according to claim 7 is characterized in that: The steam turbine is provided with a first steam extraction port and a second steam extraction port in sequence along the flow direction of steam therein, the second steam extraction pipe is connected to the first steam extraction port of the steam turbine, and the first steam extraction assembly and the steam supply pipe are both connected to the second steam extraction port of the steam turbine.

9. The high-efficiency energy-saving system for waste incineration power plants according to claim 1, characterized in that: The system heat exchanger includes a distribution room heat exchanger.

10. The high-efficiency energy-saving system for waste incineration power plants according to claim 1, characterized in that: Also included is a feed water pump installed between the deaerator and the boiler.

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