Coal-fired generator set
By combining solar thermal collection, biogas, waste incineration, compressed heat storage and waste heat utilization, the structure of coal-fired power generation units is optimized, the carbon emission and energy utilization problems of coal-fired power generation units are solved, and low-carbon, flexible and efficient power generation effects are achieved.
Patent Information
- Application Number
- CN202422879397.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-11-25
AI Technical Summary
Existing coal-fired power generation units have problems with carbon emissions. The co-firing of biomass is limited by resources, the co-firing of green ammonia results in large energy losses, the energy consumption of carbon capture is high, and existing technologies make it difficult to effectively reduce coal consumption and carbon dioxide emissions.
By combining solar thermal collection devices, biogas devices, waste incineration devices, compressed heat storage devices, waste heat utilization devices and flue gas pulverizing devices, the structure of coal-fired power generation units is optimized to achieve reduced coal consumption and carbon dioxide emissions.
By coupling multiple devices, coal consumption is effectively reduced, carbon dioxide emissions are reduced, flexible operation and efficient power generation are achieved, the problem of energy quality depreciation of electric boilers is solved, and the operating efficiency of the unit is improved.
Smart Images
Figure CN223374477U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of coal-fired power generation, in particular to a coal-fired power generation unit. Background Art
[0002] Currently, the issue of carbon emissions from coal-fired power generation units is receiving increasing attention. To reduce carbon emissions from coal-fired units, biomass co-firing, green ammonia co-firing, and carbon capture and utilization can be used. However, biomass co-firing is limited by the availability of resources around the power plant, and accurate biomass metering is a technical challenge when co-firing directly. Co-firing green ammonia requires multiple steps, including hydrogen production from water electrolysis, nitrogen production from air separation, ammonia synthesis, and ammonia liquefaction, transportation, and storage. Each step involves energy loss, so overall, this method suffers from significant energy losses. Carbon capture and utilization is significantly limited by the potential for CO2 applications, and the capture process consumes a lot of energy. Utility Model Content
[0003] The purpose of the utility model is to provide a coal-fired power generation unit to solve the problems existing in the above-mentioned prior art, which can effectively reduce coal consumption and reduce carbon dioxide emissions.
[0004] To achieve the above purpose, the present invention provides the following solutions:
[0005] The utility model provides a coal-fired generator set, comprising: a coal-fired generator device, a solar heat collecting device, a biogas device, a garbage incineration device, a compression heat storage device, a waste heat utilization device and a flue gas pulverizing device, wherein the coal-fired generator device is respectively used to cooperate with the solar heat collecting device, the biogas device, the garbage incineration device, the compression heat storage device, the waste heat utilization device and the flue gas pulverizing device; the coal-fired generator device is used for generating electricity, the solar heat collecting device is used for collecting heat, the biogas device is used for generating biogas, the garbage incineration device is used for incinerating garbage, the compression heat storage device is used for compression heat storage, the waste heat utilization device is used for waste heat utilization, and the flue gas pulverizing device is used for pulverizing coal.
[0006] Preferably, the coal-fired generator device includes a boiler, a steam turbine, a first generator and a cooling tower. The boiler is connected to the steam turbine through a superheater, and the steam turbine is connected to the first generator. A dust collector and a desulfurization system are arranged between the boiler and the cooling tower. The superheater of the boiler is connected to the steam turbine, and air enters the air preheater through a blower. The air preheater is also connected to the furnace of the boiler. The condenser, the air-cooled heat exchanger or wet-cooled heat exchanger at the bottom of the cooling tower, the low-pressure heater, the deaerator, and the high-pressure heater are connected in sequence, and the steam turbine is respectively connected to the low-pressure heater, the deaerator and the high-pressure heater.
[0007] Preferably, the steam turbine includes a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder connected in sequence, the superheater is connected to the high-pressure cylinder, the reheater of the boiler is connected to the intermediate-pressure cylinder, the high-pressure cylinder and the intermediate-pressure cylinder are respectively connected to the high-pressure heater, the intermediate-pressure cylinder is connected to the deaerator, and the low-pressure cylinder is respectively connected to the low-pressure heater and the condenser.
[0008] Preferably, the solar thermal collection device includes a solar thermal collection system, a circulation pump and a heat storage heat exchanger. The solar thermal collection system and the heat storage heat exchanger are connected through the circulation pump. The solar thermal collection system is used to collect solar energy. The circulation pump drives the circulating working medium to store the solar energy collected by the solar thermal collection system in the heat storage heat exchanger. The high-pressure heater is connected to the heat storage heat exchanger, the heat storage heat exchanger is connected to the superheater, the high-pressure cylinder is connected to the heat storage heat exchanger, and the heat storage heat exchanger is also connected to the reheater.
[0009] Preferably, the biogas device includes a biogas tank, a biogas purifier, a biogas compressor and a biogas storage tank connected in sequence, the biogas tank is connected to the steam turbine, and the heat of the steam extraction or exhaust of the steam turbine is used to heat the biogas tank, the biogas storage tank is respectively connected to the furnace of the boiler and the biogas generator set, and the biogas generator set is connected to the furnace of the boiler.
[0010] Preferably, the waste incineration device includes a waste incinerator and a waste incinerator dust collector. The waste incinerator, the waste incinerator dust collector and the furnace of the boiler are connected in sequence. The waste incinerator is used to incinerate waste. The waste incinerator dust collector is used to remove dust from the flue gas generated by the waste incinerator and send the dust-removed flue gas into the furnace of the boiler.
[0011] Preferably, the compression heat storage device includes a steam compressor and a first heat storage device, the inlet of the steam compressor is used to be connected to the steam turbine, the outlet of the steam compressor is used to be connected to the inlet of the first heat storage device, and the outlet of the first heat storage device is used to be connected to the low-pressure heater.
[0012] Preferably, the compressed heat storage device includes an air compressor and a second heat storage device, the outlet of the air compressor is used to be connected to the inlet of the second heat storage device, the outlet of the second heat storage device is connected to the gas storage tank, the gas storage tank is connected to the expander or turbine through a first heat exchanger, the expander or turbine is connected to the second generator, and the first heat exchanger is also connected to the second heat exchanger between the cooling tower and the desulfurization system.
[0013] Preferably, the waste heat utilization device comprises a wind turbine generator set, and the wind turbine generator set is located in the cooling tower.
[0014] Preferably, the flue gas pulverizing device includes a coal bunker, a coal mill, a flue gas pulverizer, a fan, a return air fan and a separator. The coal bunker is connected to the coal mill, the coal mill is connected to the flue gas pulverizer, the flue gas pulverizer is also connected to the coal mill through a high-pressure fan, the flue gas pulverizer is connected to the dust collector through the return air fan, the flue gas pulverizer is also connected to the furnace of the boiler, and the separator is respectively connected to the inlet of the air preheater and the flue gas pulverizer heat exchanger. After the flue gas at the inlet of the air preheater passes through the separator for dust removal, it enters the flue gas pulverizer heat exchanger to heat the flue gas mixture. The cooled flue gas enters the coal mill through the high-pressure fan for pulverizing, and the flue gas in the flue gas pulverizer heat exchanger enters the dust collector through the return air fan.
[0015] Compared with the prior art, the utility model has achieved the following technical effects:
[0016] The utility model couples a solar thermal collector, a biogas device and a waste incineration device, which can effectively reduce coal consumption and carbon dioxide emissions; at the same time, it couples a compression heat storage device, and uses the compression heat storage device to replace the electric boiler to consume surplus power, thereby realizing the flexible operation of the coal-fired unit, and can participate in the deep peak regulation of the power grid, solving the problem of energy quality depreciation of the electric boiler; the waste heat utilization device and the flue gas pulverizing device are used to control the exhaust temperature of the boiler, and at the same time, the exhaust waste heat of the turbine is deeply utilized, further improving the operating efficiency of the unit, and achieving the goals of low carbon, flexibility and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0018] Figure 1 This is a schematic diagram of a coal-fired power generation unit of the present invention;
[0019] Figure 2 This is a schematic diagram of the flue gas pulverizing device of the present utility model;
[0020] In the figure: 1-superheater; 2-reheater; 3-biogas purifier; 4-high-pressure cylinder; 5-medium-pressure cylinder; 6-low-pressure cylinder; 7-first generator; 8-condenser; 9-condensate pump; 10-low-pressure heater; 11-deaerator; 12-air preheater; 13-feedwater pump; 14-high-pressure heater; 15-circulating water pump; 16-cooling tower; 17-second heat exchanger; 18-furnace; 19-storage heat exchanger; 20-coal bunker; 21-pulverizer; 22-smoke and powder heat exchanger; 23-high-pressure fan; 24-return air fan; 25-supply air fan; 26-separator; 27-dust collector; 28-induced draft fan ; 29-desulfurization system; 30-air-cooled heat exchanger or wet-cooled heat exchanger; 31-wind turbine generator set; 32-first circulation pump; 33-solar thermal collection system; 34-biogas tank; 35-biogas compressor; 36-biogas storage tank; 37-biogas generator set; 38-waste incinerator; 39-waste incinerator dust collector; 40-first motor; 41-steam compressor; 42-first heat storage device; 43-second motor; 44-air compressor; 45-second heat storage device; 46-gas storage tank; 47-first heat exchanger; 48-expander; 49-second generator; 50-second circulation pump. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0022] The purpose of the utility model is to provide a coal-fired power generation unit to solve the problems existing in the above-mentioned prior art, which can effectively reduce coal consumption and reduce carbon dioxide emissions.
[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.
[0024] like Figures 1 to 2As shown, this embodiment provides a coal-fired power generation unit, including: a coal-fired generator device, a solar thermal collection device, a biogas device, a garbage incineration device, a compression heat storage device, a waste heat utilization device and a flue gas pulverizing device. The coal-fired generator device is used to communicate with the solar thermal collection device, the biogas device, the garbage incineration device, the compression heat storage device, the waste heat utilization device and the flue gas pulverizing device respectively. The coal-fired generator device is used to generate electricity, the solar thermal collection device is used to collect heat, the biogas device is used to generate biogas, the garbage incineration device is used to incinerate garbage, the compression heat storage device is used to compress and store heat, the waste heat utilization device is used to utilize waste heat, and the flue gas pulverizing device is used to make coal powder.
[0025] Specifically, in this embodiment, the coal-fired generator device includes a boiler, a steam turbine, a first generator 7 and a cooling tower 16 or a chimney. The steam turbine includes a high-pressure cylinder 4, an intermediate-pressure cylinder 5 and a low-pressure cylinder 6 connected in sequence. The steam inlet pressure of the high-pressure cylinder 4 is generally 13 to 35 MPa, the steam inlet pressure of the intermediate-pressure cylinder 5 is generally 3 to 7 MPa, and the steam inlet pressure of the low-pressure cylinder 6 is generally 0.3 to 0.6 MPa. The superheater 1 of the boiler is connected to the high-pressure cylinder 4 of the steam turbine through a pipeline, and the low-pressure cylinder 6 of the steam turbine is connected to the first generator 7. A dust collector 27, an induced draft fan 28 and a desulfurization system 29 are arranged between the air preheater 12 and the cooling tower 16 or the chimney. The boiler's reheater 2 is connected to the medium-pressure cylinder 5 through a pipeline. Air enters the air preheater 12 through the blower 25. The air preheater 12 is also connected to the boiler's furnace 18 through a pipeline. The air-cooled heat exchanger or wet-cooled heat exchanger 30 at the bottom of the cooling tower 16 or the chimney is connected to the condenser 8 through a pipeline. A circulating water pump 15 is installed on the connecting pipeline between the air-cooled heat exchanger or wet-cooled heat exchanger 30 and the condenser 8. The condenser 8 is connected to the low-pressure heater 10, the deaerator 11, the feed water pump 13 and the high-pressure heater 14 in sequence through pipelines. The feed water pressure in the high-pressure heater 14 is slightly higher than the turbine inlet steam pressure, generally between 14 and 37 MPa. The feed water pressure in the low-pressure heater 10 is generally between 2 and 4 MPa. The high-pressure cylinder 4 and the intermediate-pressure cylinder 5 are respectively connected to the high-pressure heater 14 through extraction pipes, the intermediate-pressure cylinder 5 is connected to the deaerator 11 through an extraction pipe, the low-pressure cylinder 6 is connected to the low-pressure heater 10 through an extraction pipe, and the exhaust port of the low-pressure cylinder 6 is connected to the condenser 8.
[0026] In this embodiment, the solar thermal collection device includes a solar thermal collection system 33, a first circulation pump 32 and a heat storage heat exchanger 19. The solar thermal collection system 33 is a trough type, a Fresnel type or a tower type, etc. The heat storage heat exchanger 19 has both a heat storage function and can heat feed water or steam. The solar thermal collection system 33 and the heat storage heat exchanger 19 are connected through the first circulation pump 32. The solar thermal collection system 33 is used to collect solar energy. The first circulation pump 32 drives the circulating working fluid (such as heat transfer oil, molten salt, etc.) to store the solar energy collected by the solar thermal collection system 33 in the heat storage heat exchanger 19. The outlet of the high-pressure heater 14 is connected to the heat storage heat exchanger 19, the outlet of the heat storage heat exchanger 19 is connected to the superheater 1, the exhaust port of the high-pressure cylinder 4 is connected to the heat storage heat exchanger 19, and the heat storage heat exchanger 19 is also connected to the reheater 2. Boiler feed water, that is, the boiler feed water coming out of the high-pressure heater 14 absorbs heat and is heated into steam when flowing through the heat storage heat exchanger 19, and then enters the boiler's superheater 1 for further temperature increase. The heated main steam enters the high-pressure cylinder 4 of the steam turbine to expand and perform work. The exhaust temperature of the high-pressure cylinder 4 is relatively low, and it enters the heat storage heat exchanger 19 to absorb heat and increase its temperature, and then enters the boiler's reheater 2 for further temperature increase, and then enters the intermediate-pressure cylinder 5 of the steam turbine to expand and perform work, driving the steam turbine to generate electricity. The exhaust steam of the intermediate-pressure cylinder 5 of the steam turbine enters the low-pressure cylinder 6 to continue expanding and performing work. The exhaust steam after work enters the condenser 8 to condense into water, and is then pumped into the low-pressure heater 10 by the condensate pump 9, and then enters the deaerator 11. It is further pressurized by the feedwater pump 13 and enters the high-pressure heater 14, and then enters the heat storage heat exchanger 19 to complete the steam power cycle. In this cycle, the feed water or steam absorbs solar energy and is heated by coal combustion, which saves some coal compared to a simple coal-fired unit. At the same time, it is more efficient and has a lower investment cost than a simple solar thermal power station.
[0027] In this embodiment, the biogas plant includes a biogas tank 34, a biogas purifier 3, a biogas compressor 35, and a biogas storage tank 36, which are connected in sequence. The biogas tank 34 is connected to the low-pressure cylinder 6 of the steam turbine and is heated by the heat of the steam extraction or exhaust steam from the steam turbine. The biogas storage tank 36 is respectively connected to the furnace 18 of the boiler and a biogas generator set 37. The exhaust port of the biogas generator set 37 is connected to the furnace 18 of the boiler. Municipal sewage, biodegradable waste (such as urban greening prunings, crop straw, food processing plant waste, etc.), kitchen waste, etc. are fed into the biogas tank 34. At the same time, the biogas tank 34 is heated by the exhaust steam or extraction heat from the steam turbine, maintaining a high fermentation temperature in the biogas tank 34 to increase fermentation speed and efficiency and produce more biogas. After being purified by the biogas purifier 3, the biogas enters the biogas compressor 35, is compressed, and is stored in the biogas storage tank 36. The stored biogas can replace fuel oil for ignition when the boiler is ignited or assist combustion when the boiler is under low load, providing alternative fuel for achieving greater economic benefits; when the biogas production is high, a biogas generator set 37 (gas turbine) can also be built, and the biogas first enters the biogas generator set 37 to generate electricity. The high-temperature gas discharged by the biogas generator set 37 enters the furnace 18 of the boiler and then heats the steam, thereby realizing a combined power cycle and further improving the utilization efficiency of biogas energy.
[0028] In this embodiment, the waste incineration apparatus includes a waste incinerator 38 and a waste incinerator dust collector 39. The waste incinerator 38, the waste incinerator dust collector 39, and the boiler furnace 18 are sequentially connected. The waste incinerator 38 is used to incinerate waste, and the waste incinerator dust collector 39 is used to remove dust from the flue gas generated by the waste incinerator 38 and then feed the high-temperature flue gas into the boiler furnace 18. Non-degradable combustible waste, such as plastic, rubber, and wood, is incinerated by coupling the waste incinerator 38. After the high-temperature flue gas passes through the waste incinerator dust collector 39 for dust removal, it is fed into the boiler furnace 18. The heat from the high-temperature flue gas is used to generate steam for electricity generation, and the high temperature within the furnace 18 is used to remove dioxins produced during the waste incineration process.
[0029] In this embodiment, when the coal-fired unit needs to frequently adjust its peak load, a compression heat storage device can be installed, which can be coupled to either the steam compressor 41 or the air compressor 44. If coupled to the steam compressor 41, the compression heat storage device includes a first motor 40, a steam compressor 41, and a first heat storage device 42. The inlet of the steam compressor 41 is connected to the exhaust port of the steam turbine or a certain stage of steam extraction (high-pressure cylinder 4, medium-pressure cylinder 5, or low-pressure cylinder 6), the outlet of the steam compressor 41 is connected to the inlet of the first heat storage device 42, and the outlet of the first heat storage device 42 is connected to the low-pressure heater 10. When the coal-fired unit is on-grid with a low load, or when the grid does not require much electric power, part of the exhaust steam from the steam turbine or part of the steam from a certain stage of the steam turbine is extracted and entered into the steam compressor 41 for compression. The steam compressor 41 consumes part of the electric power, thereby achieving the purpose of low-load on-grid access. When the temperature of the compressed steam rises, it enters the first heat storage device 42 to release heat, condenses into water and then returns to the heat recovery system of the steam turbine, such as returning to the low-pressure heater 10; when the coal-fired unit is online at high load, the heat stored in the first heat storage device 42 can be used to heat the feed water or replace the steam extraction heat supply of the steam turbine, thereby achieving the purpose of quickly increasing the load of the steam turbine.
[0030] In this embodiment, if coupled to an air compressor 44, the compressed heat storage device includes a second motor 43, an air compressor 44, and a second heat storage device 45. The outlet of the air compressor 44 is connected to the inlet of the second heat storage device 45, and the outlet of the second heat storage device 45 is connected to an air storage tank 46. The air storage tank 46 is connected to an expander 48 or a turbine via a first heat exchanger 47. The expander 48 or the turbine is connected to a second generator 49. The first heat exchanger 47 is also connected to the second heat exchanger 17 between the cooling tower 16 or the chimney and the desulfurization system 29. The compressed air heats up after the air compressor 44 consumes some of the electrical power, releasing heat in the second heat storage device 45 before entering the air storage tank 46 for storage. When the coal-fired unit is at low load, the air compressor 44 is used to consume part of the electric power and at the same time store the heat generated by the compression process; when the coal-fired unit is at high load, on the one hand, the heat stored in the second heat storage device 45 is used to heat the feed water or low-temperature reheat steam, and on the other hand, the high-pressure air stored in the air storage tank 46 is used to drive the expander 48 or the turbine to generate electricity. In order to increase the output of the expander 48 or the turbine, the air flowing out of the air storage tank 46 can be first heated by the first heat exchanger 47. The heat source of the first heat exchanger 47 comes from the waste heat of the flue gas, that is, the second heat exchanger 17 installed behind the dust collector 27 absorbs the waste heat of the boiler exhaust gas to heat hot water, and the second circulation pump 50 is used to transport the hot water to the first heat exchanger 47 to heat the high-pressure air, further improving the coal-fired unit's ability to quickly increase load, which is conducive to earning peak-shaving benefits from the power grid.
[0031] In this embodiment, the waste heat utilization device includes a wind turbine generator set 31, which is located in a cooling tower 16 or chimney. The turbine exhaust condenses in a condenser 8, simultaneously heating circulating water. The circulating water is then pumped by a circulating water pump 15 to the bottom of the cooling tower 16 (or intercooler) or chimney. The circulating water is then cooled by air in an air-to-cooling heat exchanger or wet-cooling heat exchanger 30 at the bottom, before entering the condenser 8 to condense the turbine exhaust. The heated air, due to its increased temperature and decreased density, rises within the cooling tower 16 or chimney until it is discharged into the atmosphere through an outlet at the top of the cooling tower 16 or chimney. In order to utilize the energy of the upward flow of air, the height of the cooling tower 16 or the chimney is further increased. For example, it can be increased from the current height of tens of meters to hundreds of meters, or even higher, so that the upward suction force in the cooling tower 16 or the chimney is greatly increased, and the speed of the upward flow of air is greatly increased. Therefore, by installing a wind turbine generator set 31 at the bottom of the cooling tower 16 or the chimney, the deep utilization of the waste heat of the steam turbine is achieved; at the same time, after the flue gas discharged from the boiler passes through the dust collector 27 and the desulfurization system 29, the clean flue gas is also discharged into the cooling tower 16 or the chimney. Since the exhaust temperature of the boiler is relatively high, the temperature of the air in the cooling tower 16 or the chimney is increased, and the suction force in the cooling tower 16 or the chimney is further increased, thereby increasing the output of the wind turbine generator set and achieving deep utilization of the waste heat of the boiler exhaust.
[0032] In this embodiment, the flue gas pulverizing device includes a coal bunker 20, a coal mill 21, a flue gas heat exchanger 22, a high-pressure fan 23, a return air fan 24 and a separator 26. The coal bunker 20 is connected to the coal mill 21, the coal mill 21 is connected to the flue gas heat exchanger 22, the flue gas heat exchanger 22 is also connected to the coal mill 21 through the high-pressure fan 23, the flue gas heat exchanger 22 is connected to the return air fan 24, the return air fan 24 outlet is connected to the dust collector 27 inlet, the flue gas heat exchanger 22 is also connected to the furnace 1 of the boiler. 8, the separator 26 is connected to the flue gas inlet of the air preheater 12 and the smoke-powder heat exchanger 22 respectively. The high-temperature smoke before the inlet of the air preheater 12 passes through the separator 26 for dust removal, and then enters the smoke-powder heat exchanger 22 to heat the smoke-powder mixture. After cooling, part of the smoke is pressurized by the high-pressure fan 23 and then enters the pulverizer 21 for pulverizing. The other part of the smoke is further cooled in the smoke-powder heat exchanger 22 to the boiler exhaust temperature and then sent to the dust collector 27 through the return fan 24.
[0033] Since the boiler feed water is heated by the heat storage heat exchanger 19, the flue gas temperature entering the air preheater 12 is relatively high, which can easily cause the exhaust gas temperature to rise. Therefore, part of the flue gas can be extracted for pulverizing, that is, the high-pressure fan 23 and the return air fan 24 are used to jointly extract part of the high-temperature flue gas before the air preheater 12. This part of the hot flue gas first enters the separator 26 for dust removal, and then enters the smoke-powder heat exchanger 22 to heat the smoke-powder mixture. After cooling, part of the flue gas is pressurized by the high-pressure fan 23 and enters the pulverizer 21 for pulverizing, and the other part continues to heat the smoke-powder mixture in the smoke-powder heat exchanger 22 until the temperature drops to the normal boiler exhaust temperature and is sent back to the boiler tail flue in front of the dust collector 27 by the return air fan 24. The temperature of the mixture of flue gas and coal powder at the outlet of the pulverizer 21 is relatively low, so it enters the smoke-powder heat exchanger 22, is heated to a certain temperature, and is then sent to the boiler furnace 18 for combustion. In this way, on the one hand, the heat of the flue gas is absorbed by the coal, thereby reducing the exhaust temperature of the boiler. On the other hand, the smoke powder is heated, and the temperature of the smoke powder mixture is increased, which is conducive to the complete combustion of the smoke powder in the furnace 18. In addition, since the oxygen content in the flue gas is relatively low, there will be no risk of coal powder explosion even if the smoke powder temperature is increased.
[0034] Since the present invention is coupled with a solar thermal collector, a biogas device and a waste incineration device, the use of coal can be greatly saved during the power generation process, thereby achieving the goal of low carbon. Since the compression heat storage device is coupled, when the on-grid power load demand is small, the steam compressor 41 and / or the air compressor 44 can be used to consume part of the electricity, thereby achieving low-load on-grid access. When the grid load is high, the heat stored in the steam compressor 41 and / or the air compressor 44 can be used to replace the steam turbine extraction to increase the output of the steam turbine, or to replace coal-fired heating of boiler feed water to reduce coal consumption, or to use high-pressure air to drive the expander 48 or turbine to generate electricity, thereby further improving the power generation capacity of the coal-fired generator set. The present invention uses a flue gas pulverizing device to reduce the boiler exhaust temperature, and at the same time uses the wind turbine generator set 31 to deeply utilize the exhaust heat of the turbine, thereby achieving high efficiency of the coal-fired generator set.
[0035] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.
Claims
1. A coal-fired power generation unit, characterized by: include: A coal-fired generator device, a solar thermal collection device, a biogas device, a garbage incineration device, a compression heat storage device, a waste heat utilization device and a flue gas pulverizing device. The coal-fired generator device is used to be respectively used with the solar thermal collection device, the biogas device, the garbage incineration device, the compression heat storage device, the waste heat utilization device and the flue gas pulverizing device. The coal-fired generator device is used to generate electricity, the solar thermal collection device is used to collect heat, the biogas device is used to generate biogas, the garbage incineration device is used to incinerate garbage, the compression heat storage device is used to compress and store heat, the waste heat utilization device is used to utilize waste heat, and the flue gas pulverizing device is used to make coal powder.
2. The coal-fired power generation unit according to claim 1, characterized in that: The coal-fired generator device includes a boiler, a steam turbine, a first generator and a cooling tower. The boiler is connected to the steam turbine through a superheater, and the steam turbine is connected to the first generator. A dust collector and a desulfurization system are arranged between the boiler and the cooling tower. The superheater of the boiler is connected to the steam turbine. Air enters the air preheater of the boiler through a blower. The air preheater is also connected to the furnace of the boiler. The condenser, the air-cooled heat exchanger or wet-cooled heat exchanger at the bottom of the cooling tower, the low-pressure heater, the deaerator, and the high-pressure heater are connected in sequence. The steam turbine is respectively connected to the low-pressure heater, the deaerator and the high-pressure heater.
3. The coal-fired power generation unit according to claim 2, characterized in that: The steam turbine includes a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder connected in sequence, the superheater is connected to the high-pressure cylinder, the reheater of the boiler is connected to the intermediate-pressure cylinder, the high-pressure cylinder and the intermediate-pressure cylinder are respectively connected to the high-pressure heater, the intermediate-pressure cylinder is connected to the deaerator, and the low-pressure cylinder is respectively connected to the low-pressure heater and the condenser.
4. The coal-fired power generation unit according to claim 3, characterized in that: The solar thermal collection device includes a solar thermal collection system, a circulation pump and a thermal storage heat exchanger. The solar thermal collection system and the thermal storage heat exchanger are connected through the circulation pump. The solar thermal collection system is used to collect solar energy. The circulation pump drives the circulating working medium to store the solar energy collected by the solar thermal collection system in the thermal storage heat exchanger. The high-pressure heater is connected to the thermal storage heat exchanger, the thermal storage heat exchanger is connected to the superheater, the high-pressure cylinder is connected to the thermal storage heat exchanger, and the thermal storage heat exchanger is also connected to the reheater.
5. The coal-fired power generation unit according to claim 2, characterized in that: The biogas device includes a biogas tank, a biogas purifier, a biogas compressor and a biogas storage tank connected in sequence. The biogas tank is connected to the steam turbine and is heated by utilizing the heat of steam extraction or exhaust from the steam turbine. The biogas storage tank is respectively connected to the furnace of the boiler and the biogas generator set, and the biogas generator set is connected to the furnace of the boiler.
6. The coal-fired power generation unit according to claim 2, characterized in that: The waste incineration device includes a waste incinerator and a waste incinerator dust collector. The waste incinerator, the waste incinerator dust collector and the furnace of the boiler are connected in sequence. The waste incinerator is used to incinerate waste. The waste incinerator dust collector is used to remove dust from the flue gas generated by the waste incinerator and send the dust-removed flue gas into the furnace of the boiler.
7. The coal-fired power generation unit according to claim 2, characterized in that: The compression heat storage device includes a steam compressor and a first heat storage device, the inlet of the steam compressor is used to be connected to the steam turbine, the outlet of the steam compressor is used to be connected to the inlet of the first heat storage device, and the outlet of the first heat storage device is used to be connected to the low-pressure heater.
8. The coal-fired power generation unit according to claim 2, characterized in that: The compressed heat storage device includes an air compressor and a second heat storage device, the outlet of the air compressor is used to be connected to the inlet of the second heat storage device, the outlet of the second heat storage device is connected to the gas storage tank, the gas storage tank is connected to the expander or turbine through a first heat exchanger, the expander or turbine is connected to the second generator, and the first heat exchanger is also connected to the second heat exchanger between the cooling tower and the desulfurization system.
9. The coal-fired power generation unit according to claim 2, characterized in that: The waste heat utilization device includes a wind turbine generator set, and the wind turbine generator set is located in the cooling tower.
10. The coal-fired power generation unit according to claim 2, characterized in that: The flue gas pulverizing device includes a coal bunker, a coal mill, a flue gas pulverizing heat exchanger, a fan, a return air fan and a separator. The coal bunker is connected to the coal mill, the coal mill is connected to the flue gas pulverizing heat exchanger, the flue gas pulverizing heat exchanger is also connected to the coal mill through a high-pressure fan, the flue gas pulverizing heat exchanger is connected to the dust collector through the return air fan, the flue gas pulverizing heat exchanger is also connected to the furnace of the boiler, and the separator is respectively connected to the inlet of the air preheater and the flue gas pulverizing heat exchanger. After the flue gas at the inlet of the air preheater passes through the separator for dust removal, it enters the flue gas pulverizing heat exchanger to heat the flue gas mixture. The cooled flue gas enters the coal mill through the high-pressure fan for pulverizing, and the flue gas in the flue gas pulverizing heat exchanger enters the dust collector through the return air fan.