Coal-fired unit low-carbon optimization system integrating wind, light and electric heating carbon reduction

Abstract

The invention discloses a coal-fired unit low-carbon optimization system integrating wind-light-electric-heat carbon reduction, which comprises a coal-fired power generation subsystem, a wind power generation subsystem, a photovoltaic power generation subsystem and a wind-light-electric-heat carbon reduction subsystem, the output end of the wind power generation subsystem and the output end of the photovoltaic power generation subsystem are connected with a power interface of the wind-light-electricity-heat carbon reduction subsystem, an outlet of the wind-light-electricity-heat carbon reduction subsystem is connected with the coal-fired power generation subsystem, and the system can achieve deep clean carbon reduction.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power generation and relates to a coal-fired unit low-carbon optimization system integrated with wind, light, electricity, heat and carbon reduction. BACKGROUND

[0003] Current mainstream low-carbon modification technologies cannot meet the requirements of the new generation of index system. The biomass blending combustion scheme is limited by fuel supply stability and ash corrosion problems, and the actual blending ratio is usually less than 10%, the carbon emission reduction contribution is less than 8%, and the reduction range of power supply coal consumption is less than 2%; although the theoretical emission reduction rate of the molten salt heat storage coupling technology is 15%-20%, the system investment cost exceeds 2000 yuan / kW, and it cannot reduce the total amount of fossil energy consumption from the source; although pure green electricity grid connection can achieve 100% emission reduction, it is difficult to support the power supply function due to the wind and light abandonment rate of more than 30% and the risk of power grid impact. In summary, there are structural problems in the current coal-fired power low-carbon transformation, and it is urgent to couple new technologies to achieve the deep cleaning and carbon reduction goal. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a coal-fired unit low-carbon optimization system integrated with wind, light, electricity, heat and carbon reduction, which can achieve deep cleaning and carbon reduction.

[0005] To achieve the above purpose, the present application discloses a coal-fired unit low-carbon optimization system integrated with wind, light, electricity, heat and carbon reduction, which comprises a coal-fired power generation system, a wind power generation system, a photovoltaic power generation system and a wind-light-electricity-heat-carbon reduction subsystem, wherein the output end of the wind power generation system and the output end of the photovoltaic power generation system are connected with the power supply interface of the wind-light-electricity-heat-carbon reduction subsystem, and the outlet of the wind-light-electricity-heat-carbon reduction subsystem is connected with the coal-fired power generation system.

[0006] Further, the coal-fired power generation system comprises a boiler, a generator, a steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder, a steam turbine low-pressure cylinder, a condenser, a condensate pump, a low-pressure heater, a deaerator, a feed water pump and a high-pressure heater; the outlet of the boiler is connected with the inlet of the steam turbine low-pressure cylinder through the steam turbine high-pressure cylinder and the steam turbine medium-pressure cylinder, the outlet of the steam turbine low-pressure cylinder is connected with the inlet of the deaerator through the condenser, the condensate pump and the tube side of the low-pressure heater, the outlet of the deaerator is connected with the tube side inlet of the high-pressure heater through the feed water pump, and the tube side outlet of the high-pressure heater is connected with the inlet of the boiler through the first valve.

[0007] Further, the steam extraction port of the steam turbine high-pressure cylinder is connected with the shell side inlet of the high-pressure heater, and the shell side outlet of the steam turbine high-pressure cylinder is connected with the inlet of the deaerator.

[0008] Further, the steam extraction port of the steam turbine medium-pressure cylinder is connected with the steam inlet of the deaerator. Further, the steam extraction port of the steam turbine medium-pressure cylinder is connected with the steam inlet of the deaerator.

[0009] Further, the steam turbine low-pressure cylinder steam extraction port is communicated with the low-pressure heater shell side inlet, and the low-pressure heater shell side outlet is communicated with the condenser inlet.

[0010] Further, the generator, the steam turbine high-pressure cylinder, the steam turbine intermediate-pressure cylinder and the steam turbine low-pressure cylinder are coaxially arranged.

[0011] Further, the system further comprises a transformer, the output end of the generator is connected with the input end of the transformer, the output end of the wind power generation system and the output end of the photovoltaic power generation system are connected with one end of the first switch, and the other end of the first switch is connected with the input end of the transformer.

[0012] Further, the system further comprises a second switch and an electric boiler, the output end of the wind power generation system and the output end of the photovoltaic power generation system are connected with one end of the second switch, and the other end of the second switch is connected with the power supply interface of the electric boiler.

[0013] Further, the high-pressure heater tube side outlet is communicated with the electric boiler inlet through the first valve, and the electric boiler outlet is communicated with the boiler inlet.

[0014] Further, the high-pressure heater tube side outlet is communicated with the boiler inlet through a bypass system, and the bypass system is provided with a second valve.

[0015] The present application has the following beneficial effects: The integrated wind-solar-electric-heat carbon reduction coal-fired unit low-carbon optimization system in the embodiment of the present application precisely couples the wind power generation system and the photovoltaic power generation system through the high-pressure heater outlet, realizes green electricity direct heat energy replacement, significantly improves the utilization efficiency of clean energy, and effectively breaks through the high-carbon emission predicament of the traditional coal-fired unit. Relying on the low-cost electric energy characteristics of photovoltaic and wind power to drive high-temperature feedwater heating, the coal consumption and economic cost are greatly compressed, and deep carbon reduction and economic benefit are simultaneously realized. Finally, the coal and electricity low-carbon transformation paradigm of "green electricity on-site consumption-heat energy precise replacement-multi-source dynamic cooperation" is constructed, which provides a scalable engineering path for achieving the core goals of "clean carbon reduction" and "high-efficiency regulation" of the new generation of coal and electricity technology system.

[0016] Further, by configuring a bypass switch, the utilization efficiency of clean energy is significantly improved, and the high-carbon emission predicament of the traditional coal-fired unit is effectively broken through. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the exemplary embodiments of the present application and their description, serve to explain the present application, and do not constitute an improper limitation of the present application. In the drawings: Figure 1 It is a structural diagram of the present application.

[0018] 1 is a wind power generation system; 2 is a photovoltaic power generation system; 3 is a transformer; 4 is an electric boiler; 5 is a boiler; 6 is a generator; 7 is a high-pressure cylinder of a steam turbine; 8 is a medium-pressure cylinder of a steam turbine; 9 is a low-pressure cylinder of a steam turbine; 10 is a condenser; 11 is a condensate pump; 12 is a low-pressure heater; 13 is a deaerator; 14 is a feed water pump; and 15 is a high-pressure heater. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0020] In the description of the present application, it should be understood that the terms "comprise" and "include" indicate the presence of described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or sets thereof.

[0021] It should also be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and the appended claims of the present application, unless otherwise clearly indicated by the context, the singular forms "a", "an" and "the" are intended to include the plural forms as well.

[0022] It should be further understood that the term "and / or" used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations thereof, and includes these combinations, for example, A and / or B can mean A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0023] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present application to describe the preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, the first preset range can also be referred to as the second preset range, and similarly, the second preset range can also be referred to as the first preset range without departing from the scope of the embodiments of the present application.

[0024] Depending on the context, the word "if" as used herein can be interpreted to mean "when" or "while" or "in response to determining" or "in response to detecting." Similarly, the phrase "if it is determined" or "if [a stated condition or event] is detected" can be interpreted to mean "when it is determined" or "in response to determining" or "when [the stated condition or event] is detected" or "in response to detecting [the stated condition or event]."

[0025] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art without creative work based on the embodiments in the present application belong to the scope of protection of the present application.

[0026] Various structural schematic diagrams according to the disclosed embodiments of the present application are shown in the drawings. These diagrams are not drawn to scale, in which some details are exaggerated for the purpose of clarity and some details can be omitted. The shapes of various regions, layers and the relative size and positional relationship therebetween shown in the drawings are only exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0027] Embodiment one The integrated wind-solar-thermal carbon-reducing coal-fired unit low-carbon optimization system described in the present application comprises a coal-fired power generation system, a wind power generation system 1, a solar power generation system 2 and a wind-solar-thermal carbon-reducing subsystem, wherein the output end of the wind power generation system 1 and the output end of the solar power generation system 2 are connected with the power supply interface of the wind-solar-thermal carbon-reducing subsystem, and the outlet of the wind-solar-thermal carbon-reducing subsystem is connected with the coal-fired power generation system.

[0028] Embodiment two Reference Figure 1 The integrated wind-solar-thermal carbon-reducing coal-fired unit low-carbon optimization system described in the present application comprises a wind power generation system 1, a solar power generation system 2, a transformer 3, an electric boiler 4, a boiler 5, a generator 6, a steam turbine high-pressure cylinder 7, a steam turbine medium-pressure cylinder 8, a steam turbine low-pressure cylinder 9, a condenser 10, a condensate pump 11, a low-pressure heater 12, a deaerator 13, a feedwater pump 14 and a high-pressure heater 15. The outlet of the boiler 5 is connected to the inlet of the turbine high pressure cylinder 7, the turbine intermediate pressure cylinder 8 and the turbine low pressure cylinder 9, the outlet of the turbine low pressure cylinder 9 is connected to the inlet of the condenser 10, the condensate pump 11 and the tube side of the low pressure heater 12, the outlet of the deaerator 13 is connected to the tube side inlet of the feed water pump 14 and the high pressure heater 15, the tube side outlet of the high pressure heater 15 is connected to the inlet of the electric boiler 4 through the first valve, the outlet of the electric boiler 4 is connected to the inlet of the boiler 5, the tube side outlet of the high pressure heater 15 is connected to the inlet of the boiler 5 through the bypass system, and the second valve is arranged in the bypass system.

[0029] The extraction port of the turbine high pressure cylinder 7 is connected to the shell side inlet of the high pressure heater 15, the shell side outlet of the turbine high pressure cylinder 7 is connected to the inlet of the deaerator 13, the extraction port of the turbine intermediate pressure cylinder 8 is connected to the steam inlet of the deaerator 13, and the extraction port of the turbine low pressure cylinder 9 is connected to the shell side inlet of the low pressure heater 12, and the shell side outlet of the low pressure heater 12 is connected to the inlet of the condenser 10.

[0030] The generator 6, the turbine high pressure cylinder 7, the turbine intermediate pressure cylinder 8 and the turbine low pressure cylinder 9 are coaxially arranged.

[0031] The output end of the generator 6 is connected to the input end of the transformer 3, the output end of the wind power electronic system 1 and the output end of the photovoltaic electronic system 2 are connected to one end of the first switch, the other end of the first switch is connected to the input end of the transformer 3, the output end of the wind power electronic system 1 and the output end of the photovoltaic electronic system 2 are connected to one end of the second switch, and the other end of the second switch is connected to the power interface of the electric boiler 4.

[0032] The coal-fired power generation system includes a boiler 5, a generator 6, a steam turbine high-pressure cylinder 7, a steam turbine medium-pressure cylinder 8, a steam turbine low-pressure cylinder 9, a condenser 10, a condensate pump 11, a low-pressure heater 12, a deaerator 13, a feedwater pump 14, and a high-pressure heater 15. In operation, coal is fed into the boiler 5 to be combusted to release a large amount of heat energy, which heats the feedwater into high-temperature and high-pressure superheated steam. The high-temperature and high-pressure steam then enters the steam turbine to be expanded step by step to do work, driving the steam turbine rotor to rotate at a high speed, and the internal energy of the steam is converted into mechanical energy of the rotor. The steam turbine rotor drives the rotor of the generator 6 coaxial therewith to rotate, generating electric energy according to the principle of electromagnetic induction. The exhaust steam discharged from the steam turbine low-pressure cylinder 9 enters the condenser 10. In the condenser 10, the exhaust steam is condensed into condensate water by a large amount of circulating water. The condensate water is pumped out by the condensate pump 11 and is pressurized to flow through a plurality of low-pressure heaters 12. In the low-pressure heaters 12, the condensate water is heated by extraction steam extracted from a lower pressure stage (e.g., a low-pressure cylinder extraction port) of the steam turbine, and the temperature is gradually increased. The condensate water heated by the low-pressure heaters 12 enters the deaerator 13. The feedwater in the deaerator 13 is pressurized by the feedwater pump 14 and flows through a plurality of high-pressure heaters 15. In the high-pressure heaters 15, the feedwater is further heated by extraction steam extracted from a higher pressure stage (e.g., a high-pressure cylinder extraction port) of the steam turbine and then enters the boiler 5.

[0033] The wind power generation system 1 includes a wind turbine and a transformer 3. The wind turbine generates electricity using wind power, and the electric energy is stepped up by the transformer 3 and enters the power grid.

[0034] The photovoltaic power generation system 2 includes a photovoltaic. The photovoltaic generates electricity using solar energy, and the electric energy is stepped up by the transformer 3 and enters the power grid.

[0035] The wind-solar-electric-thermal carbon reduction subsystem includes an electric boiler 4, the inlet end of the electric boiler 4 is connected to the outlet pipeline of the high-pressure heater 15, and the outlet end of the electric boiler 4 is connected to the feedwater inlet of the boiler 5. The electric boiler 4 consumes the electricity generated by the wind turbine and the photovoltaic to convert the electric energy into heat energy, which is used to heat the feedwater at the outlet of the high-pressure heater 15 to further increase the temperature of the feedwater.

[0036] In this embodiment, part of the electric energy generated by the wind power generation system 1 and the photovoltaic power generation system 2 can be supplied to the electric boiler 4, and the other part enters the power grid.

[0037] In this embodiment, a bypass system of the electric boiler 4 is provided. When all the electric energy generated by the wind power generation system 1 and the photovoltaic power generation system 2 is fed into the power grid, and the electric boiler 4 is not in use, the feedwater system switches to the bypass system of the electric boiler 4, and the feedwater at the outlet of the high-pressure heater 15 can directly enter the boiler 5 to absorb heat.

[0038] It should be noted that the present application couples the electric boiler 4 at the outlet of the high-pressure heater 15 to heat the feed water using wind and light green electricity, further improves the feed water temperature to realize heat energy replacement, and innovatively configures a bypass switching, significantly improves the utilization efficiency of clean energy, and effectively breaks through the high carbon emission dilemma of traditional coal-fired units. Relying on the characteristics of low-cost electric energy of photovoltaic and wind power to drive high-temperature feed water heating, the coal consumption and economic cost are greatly compressed, and deep carbon reduction and economic benefit are simultaneously realized, finally building a coal-electricity low-carbon transformation paradigm of "green electricity on-site consumption-heat energy precise replacement-multi-source dynamic cooperation", providing a scalable engineering path for achieving the core goals of "clean carbon reduction" and "high-efficiency regulation" of the new generation of coal-electricity technology system.

[0039] It should be noted that the present application has the following characteristics: The present application couples the electric boiler 4 at the outlet of the high-pressure heater 15 to realize heat energy replacement, which fundamentally breaks through the high carbon emission dilemma of traditional coal-fired units. The electric boiler 4 directly uses wind power and photovoltaic clean electricity to heat high-temperature feed water above 200 DEG C, significantly reduces the high-grade steam extraction consumption of the steam turbine, and reduces the input of fossil fuels in the boiler 5 under the same power generation load, greatly reducing the overall carbon emission intensity of the system. At the same time, the low-cost electric energy characteristics of photovoltaic and wind power make the coal production cost significantly reduced, directly compressing the fuel cost, and creating sustainable economic benefits for coal power enterprises. This technical path realizes efficient replacement of green electricity for fossil energy from the source of energy grade, providing breakthrough support for coal power clean transformation.

[0040] The bypass system and multi-energy collaborative mechanism of the electric boiler 4 designed by the present application effectively guarantee the safety and flexibility of the system operation. When the wind and light resources are sufficient, the electric boiler 4 is fully powered to heat the high-temperature feed water, and the coal heat is maximally replaced; when the green electricity output is insufficient or needs to be fully put on the grid, the bypass system automatically switches to ensure that the feed water passage is not blocked. This intelligent switching capability enables the unit to deeply participate in the grid peak regulation and stably maintain the thermal cycle parameters, completely solving the safety hazard of "green electricity fluctuation impacting the thermal system" in the traditional transformation scheme.

[0041] The present application adopts the technical route of directly supplying wind, light and green electricity to the high-temperature area, which greatly improves the utilization efficiency of clean energy. Compared with low-temperature heating, the electric energy-thermal energy conversion in the high-temperature area above 200 DEG C can reduce the loss of energy grade, so that more significant coal consumption reduction benefit is generated per unit of green electricity input. At the same time, this scheme reuses the existing thermal cycle facilities of the coal-fired unit, avoids large-scale investment in new equipment, greatly reduces the complexity and cost of transformation, and provides an economically feasible low-carbon transformation path for coal power enterprises.

[0042] The application creatively establishes a "coal-fired power-wind power-photovoltaic-electric heating" multi-energy flow coordination framework, which significantly enhances the carrying capacity of the power system for fluctuating renewable energy through local consumption of green electricity and precise replacement of heat energy. During the period of rapid increase in grid peak shaving demand, the electric boiler 4 is preferentially started to bear the load fluctuation, maintaining the coal-fired unit in high efficiency operation, which breaks the industry's stubborn problem of "coal consumption soaring in low load condition". Not only does it avoid the penalty of coal efficiency in low load condition, but also offsets the high-priced coal consumption with low-cost green electricity, thus breaking the economic bottleneck of coal power in two ways and providing key support for building a new power system.

[0043] In summary, the application promotes fossil energy reduction by deeply integrating clean power and traditional coal power infrastructure while ensuring energy security, and builds an "environmental protection-economic" double benefit mechanism. The emission reduction benefit not only comes from directly reducing coal consumption, but also from the synergistic carbon reduction effect produced by improving the overall operation efficiency of the unit.

[0044] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0045] It should be understood that the application is not limited to the precise construction that has been described above and illustrated in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the appended claims.

[0046] The above is only the preferred embodiment of the application, not any limitation on the application, and any simple modification, change and equivalent structural change made according to the technical essence of the application to the above embodiment are still within the protection scope of the technical solution of the application.

Claims

1. An integrated wind-solar-electric-thermal carbon reduction system for low-carbon optimization of a coal-fired unit, characterized in that, The system comprises a coal-fired power generation system, a wind power generation system (1), a photovoltaic power generation system (2) and a wind-solar-thermal carbon reduction system, wherein the output ends of the wind power generation system (1) and the photovoltaic power generation system (2) are connected with the power interface of the wind-solar-thermal carbon reduction system, and the outlet of the wind-solar-thermal carbon reduction system is connected with the coal-fired power generation system.

2. The integrated wind-solar-thermal carbon-reducing system for coal-fired units with low carbon optimization according to claim 1, characterized in that, The coal-fired power generation system comprises a boiler (5), a generator (6), a high-pressure cylinder (7) of a steam turbine, a medium-pressure cylinder (8) of the steam turbine, a low-pressure cylinder (9) of the steam turbine, a condenser (10), a condensate pump (11), a low-pressure heater (12), a deaerator (13), a feed water pump (14) and a high-pressure heater (15); the outlet of the boiler (5) is connected in communication with the inlet of the low-pressure cylinder (9) of the steam turbine through the high-pressure cylinder (7) and the medium-pressure cylinder (8) of the steam turbine, the outlet of the low-pressure cylinder (9) of the steam turbine is connected in communication with the inlet of the deaerator (13) through the condenser (10), the condensate pump (11) and the tube side of the low-pressure heater (12), the outlet of the deaerator (13) is connected in communication with the tube side inlet of the high-pressure heater (15) through the feed water pump (14), and the tube side outlet of the high-pressure heater (15) is connected in communication with the inlet of the boiler (5) through a first valve.

3. The integrated wind-solar-thermal carbon-reducing system for coal-fired units with low carbon optimization according to claim 2, characterized in that, The steam extraction port of the high-pressure cylinder (7) of the steam turbine is connected in communication with the shell side inlet of the high-pressure heater (15), and the shell side outlet of the high-pressure cylinder (7) of the steam turbine is connected in communication with the inlet of the deaerator (13).

4. The integrated wind-solar-thermal carbon-reducing system for coal-fired units with low carbon optimization system according to claim 2, characterized in that, The steam extraction port of the medium-pressure cylinder (8) of the steam turbine is connected in communication with the steam inlet of the deaerator (13).

5. The integrated wind-solar-thermal carbon-reducing system for coal-fired units with low carbon optimization according to claim 2, characterized in that, The steam extraction port of the low-pressure cylinder (9) of the steam turbine is connected in communication with the shell side inlet of the low-pressure heater (12), and the shell side outlet of the low-pressure heater (12) is connected in communication with the inlet of the condenser (10).

6. The integrated wind-solar-electric-thermal carbon-reducing system for coal-fired units with low carbon optimization system according to claim 2, characterized in that, The system further comprises the generator (6), and the generator (6), the high-pressure cylinder (7) of the steam turbine, the medium-pressure cylinder (8) of the steam turbine and the low-pressure cylinder (9) of the steam turbine are coaxially arranged.

7. The integrated wind-solar-thermal carbon-reducing system of a coal-fired unit with low carbon optimization according to claim 6, characterized in that, The system further comprises a transformer (3), the output end of the generator (6) is connected with the input end of the transformer (3), the output ends of the wind power generation system (1) and the photovoltaic power generation system (2) are connected with one end of a first switch, and the other end of the first switch is connected with the input end of the transformer (3).

8. The integrated wind-solar-thermal carbon-reducing system of a coal-fired unit with low carbon optimization according to claim 7, characterized in that, The system further comprises a second switch and an electric boiler (4), the output ends of the wind power generation system (1) and the photovoltaic power generation system (2) are connected with one end of the second switch, and the other end of the second switch is connected with the power interface of the electric boiler (4).

9. The integrated wind-solar-thermal carbon-reducing system of a coal-fired unit with low carbon optimization according to claim 7, characterized in that, The tube side outlet of the high-pressure heater (15) is connected in communication with the inlet of the electric boiler (4) through the first valve, and the outlet of the electric boiler (4) is connected in communication with the inlet of the boiler (5).

10. The integrated wind-solar-thermal carbon-reducing system for coal-fired units with low carbon optimization according to claim 7, characterized in that, The tube side outlet of the high-pressure heater (15) is connected in communication with the inlet of the boiler (5) through a bypass system, and a second valve is arranged in the bypass system.

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