Peak-shaving and frequency-regulating system and method for coupled plasma pyrolysis device in thermal power plant

Abstract

The present invention discloses a peak-shaving and frequency-modulating system and method for a thermal power plant coupled plasma pyrolysis device, the system comprising a thermal power plant system and a plasma pyrolysis system; the plasma pyrolysis system comprising a plasma pyrolysis device, a pyrolysis gas purification and separation device, an acetylene storage tank and other pyrolysis gas storage tanks; the pyrolysis gas outlet of the plasma pyrolysis device is connected to the inlet of the pyrolysis gas purification and separation device, the acetylene outlet of the pyrolysis gas purification and separation device is connected to the acetylene storage tank; other pyrolysis gas outlets of the pyrolysis gas purification and separation device are connected to other pyrolysis gas storage tanks; the other pyrolysis gas storage tanks are connected to the gas inlet of the thermal power plant system; the power output port of the thermal power plant system is connected to the power supply port of the plasma pyrolysis device. The present invention combines the plasma pyrolysis device with the generator of the thermal power plant, so as to not only realize timely peak-shaving and frequency-modulating, but also improve the economy of the plasma pyrolysis acetylene production technology.

Description

Technical Field

[0001] The invention relates to the field of thermal power generation, and in particular to a peak-shaving and frequency-modulating system and method for a coupled plasma pyrolysis device in a thermal power plant. Background Art

[0002] Global climate issues are increasingly attracting people's attention, and the "low-carbon economy" characterized by low energy consumption, low emissions and low pollution has become a hot spot in global political and economic games. my country's power supply is mainly based on thermal power. Under variable load operation conditions, the system of thermal power plants will be limited by the safe and stable operation capabilities of various devices and equipment, resulting in the inability of thermal power generating units to respond to the requirements of the power grid's peak-shaving and frequency-shaving auxiliary services. The depth and response rate of peak-shaving cannot meet the requirements of the power grid, and the response rate and depth of frequency regulation are very limited. Therefore, it is urgent to find a technology that can increase the variable load adaptability of thermal power plants and units.

[0003] The technology of producing acetylene by plasma pyrolysis uses electric energy to excite working gases such as hydrogen and argon into a plasma state, providing the high temperature and high enthalpy environment required for cracking of the raw materials. During the residence time of milliseconds, the raw materials undergo a cracking process to produce acetylene, while light gases such as hydrogen, methane, ethylene, propane, and propylene are produced as by-products. This process has the characteristics of short process, low resource consumption, and low carbon. It provides a clean and efficient way for acetylene production with competitive potential in principle, and also provides new ideas for the utilization of biomass, solid waste, hazardous waste and other materials that are difficult to handle using conventional methods. However, the economic feasibility of this technology is severely limited by electricity prices, and it is necessary to select appropriate application scenarios to improve its economic feasibility. Summary of the invention

[0004] The purpose of the present invention is to provide a peak-shaving and frequency-regulating system and method for a coupled plasma pyrolysis device in a thermal power plant. By combining the plasma pyrolysis device with the generator of the thermal power plant, not only can timely peak-shaving and frequency regulation be achieved, but also the economy of the plasma pyrolysis acetylene production technology can be improved.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A peak-shaving and frequency-regulating system for a coupled plasma pyrolysis device in a thermal power plant, including a thermal power plant system and a plasma pyrolysis system;

[0007] The plasma pyrolysis system comprises a plasma pyrolysis device, a pyrolysis gas purification and separation device, an acetylene storage tank and other pyrolysis gas storage tanks; the pyrolysis gas outlet of the plasma pyrolysis device is connected to the inlet of the pyrolysis gas purification and separation device, the acetylene outlet of the pyrolysis gas purification and separation device is connected to the acetylene storage tank; other pyrolysis gas outlets of the pyrolysis gas purification and separation device are connected to other pyrolysis gas storage tanks;

[0008] The other pyrolysis gas storage tanks are connected to the gas inlet of the thermal power plant system;

[0009] The power output port of the thermal power plant system is connected to the power supply port of the plasma pyrolysis device.

[0010] A further improvement of the present invention is that the thermal power plant system comprises a coal pretreatment device, a gasifier, a waste heat boiler, a dust removal and desulfurization purification device, a gas turbine and a waste heat boiler connected in sequence;

[0011] The gas turbine and the waste heat boiler are connected to the gas generator and the steam generator respectively;

[0012] The outlet of the coal pretreatment equipment is connected to the first inlet of the waste heat boiler through the gasifier; the gas outlet of the waste heat boiler is connected to the dust removal and desulfurization purification equipment, the gas turbine and the waste heat boiler in sequence; the steam outlet of the waste heat boiler is connected to the steam inlet of the waste heat boiler.

[0013] A further improvement of the present invention is that the waste heat boiler also includes a heat exchange circuit for performing heat exchange with the pyrolysis gas of the plasma pyrolysis device.

[0014] A further improvement of the present invention is that: a flow regulating valve is provided in the pipeline connecting the other pyrolysis gas storage tank to the gas inlet of the thermal power plant system;

[0015] A power regulating switch is arranged on the power supply line connecting the power output port of the thermal power plant system to the power supply port of the plasma pyrolysis device.

[0016] A further improvement of the present invention is that the thermal power plant system is a coal-fired power plant, a gas turbine power plant, an IGCC power plant, a biomass power plant or a waste incineration power plant.

[0017] A further improvement of the present invention is that: the thermal power plant system includes a gas turbine, a waste heat boiler, a gas generator and a steam generator;

[0018] The gas turbine and the waste heat boiler are connected to the gas generator and the steam generator respectively; the power output ports of the gas generator and the steam generator are connected to the power supply port of the plasma pyrolysis device;

[0019] The gas inlet of the gas turbine is connected to other pyrolysis gas storage tanks and a gas pipeline; the gas pipeline is a methane pipeline, a hydrogen pipeline or a methane-hydrogen mixed pipeline.

[0020] A further improvement of the present invention is that: the thermal power plant system includes a combustion device, a gas engine / steam turbine and a generator;

[0021] The input port of the combustion device is connected to the fuel pipeline and other pyrolysis gas storage tanks; the output port of the combustion device is connected to the gas engine / steam turbine, and the gas engine / steam turbine is connected to the generator; the power output port of the generator is connected to the power supply port of the plasma pyrolysis device.

[0022] A further improvement of the present invention is that the pyrolysis gas of the plasma pyrolysis device contains acetylene and also contains one or more of ethylene, methane, hydrogen, ethane, propane and propylene.

[0023] A further improvement of the present invention is that the raw material used in the plasma pyrolysis device is any one or more of waste tires, solid wastes, hazardous wastes and biomass containing carbon and hydrogen elements.

[0024] A peak-shaving and frequency-regulating method for a peak-shaving and frequency-regulating system of a coupled plasma pyrolysis device in a thermal power plant comprises:

[0025] When the power grid requires thermal power plants to reduce load, peak and adjust frequency: the amount of electricity on the grid P 上 Reduce △P 上 When the power of the plasma pyrolysis device is increased, it increases △P 等 At the same time, the flow rate of other pyrolysis gases sent to the thermal power plant is reduced, so that the total output power of the thermal power plant is reduced by ΔP 火 , and finally the changes in the above electrical quantities satisfy the following equation:

[0026] △P 上 =△P 等 +ΔP 火

[0027] In the formula, the values ​​of each change in electric quantity are all absolute values; in this case, the flow rate of other pyrolysis gas entering other pyrolysis gas storage tanks increases, and the flow rate of other pyrolysis gas flowing from other pyrolysis gas storage tanks to the thermal power plant decreases, the input is greater than the output, and the reserves of other pyrolysis gas in other pyrolysis gas storage tanks increase, which is used as a reserve for load peak regulation and frequency regulation;

[0028] When the power grid requires thermal power plants to increase load, peak and frequency regulation: the amount of electricity on the grid P 上 Need to increase △P 上 When the power of the plasma pyrolysis device is reduced, ΔP 等 At the same time, the flow rate of other pyrolysis gas sent to the thermal power plant is increased to increase the output of the thermal power plant, so that the total output power of the thermal power plant increases by ΔP 火 , and finally the changes in the above electrical quantities satisfy the following equation:

[0029] △P 上 =△P 等 +ΔP 火

[0030] In this case, the flow rate of other pyrolysis gas entering other pyrolysis gas storage tanks decreases, the flow rate of other pyrolysis gas flowing from other pyrolysis gas storage tanks to the thermal power plant increases, the input is less than the output, and the other pyrolysis gas reserves in other pyrolysis gas storage tanks decrease.

[0031] Compared with the prior art, the beneficial effects brought by the present invention include:

[0032] 1) By using the plasma pyrolysis device and pyrolysis gas storage tank, the characteristics of power supply and load can be quickly changed at any time to meet the peak load and frequency regulation requirements of the power grid for thermal power plants;

[0033] 2) Plasma pyrolysis devices can treat solid waste, hazardous waste and other materials that are difficult to treat by conventional means, and obtain environmental benefits;

[0034] 3) The product gas of the plasma pyrolysis device mainly includes light gases such as acetylene, which can be sold to increase the power station's revenue;

[0035] 4) Respond to the peak-shaving and frequency-regulating load of the power grid through the plasma pyrolysis device, collect subsidies or service fees for the peak-shaving and frequency-regulating auxiliary services of the power grid, and increase the operating efficiency of the thermal power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0037] Figure 1 It is a structural schematic diagram of a peak-shaving and frequency-modulating system of a coupled plasma pyrolysis device in a thermal power plant according to the present invention;

[0038] Figure 2 This is a schematic structural diagram of a peak-shaving and frequency-modulating system for a coupled plasma pyrolysis device in a thermal power plant according to Example 1 of the present invention;

[0039] Figure 3 This is a structural schematic diagram of a peak-shaving and frequency-modulating system of a coupled plasma pyrolysis device in a thermal power plant according to embodiment 2 of the present invention.

[0040] 1. Coal pretreatment; 2. Gasification furnace; 3. Waste heat boiler; 4. Dust removal, desulfurization and purification; 5. Gas turbine; 6. Waste heat boiler; 7. Gas generator; 8. Steam generator; 9. Plasma pyrolysis device; 10. Pyrolysis gas purification and separation; 11. Acetylene storage tank; 12. Other pyrolysis gas storage tanks; 13. Combustion device; 14. Gas engine / steam turbine; 15. Generator. DETAILED DESCRIPTION

[0041] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0042] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0043] See also Figure 1 As shown, the present invention provides a peak-shaving and frequency-modulating system for a thermal power plant coupled plasma pyrolysis device, comprising a thermal power plant system and a plasma pyrolysis system;

[0044] The thermal power plant system only includes a combustion device 13, a gas engine / steam turbine 14 and a generator 15; the plasma pyrolysis system includes a plasma pyrolysis device 9, a pyrolysis gas purification and separation device 10, an acetylene storage tank 11 and other pyrolysis gas storage tanks 12; the output end of the generator 15 is connected to the plasma pyrolysis device 9, and can provide electrical energy to the plasma pyrolysis device 9.

[0045] The inlet of the plasma pyrolysis device 9 is connected to the hydrocarbon raw material; the outlet of the plasma pyrolysis device 9 is connected to the inlet of the pyrolysis gas purification and separation device 10, and the acetylene outlet of the pyrolysis gas purification and separation device 10 is connected to the acetylene storage tank 11; the other pyrolysis gas outlets of the pyrolysis gas purification and separation device 10 are connected to other pyrolysis gas storage tanks 12. The outlets of other pyrolysis gas storage tanks 12 are connected to the fuel gas inlet of the combustion device 13.

[0046] The fuel and other pyrolysis gases in the pyrolysis gas storage tank 12 are sent to the combustion device 13 for combustion, and the high-temperature flue gas is generated to drive the gas engine / steam turbine 14 to rotate, and then drive the generator 15 to generate electricity to provide electric energy to the plasma pyrolysis device 9. The plasma pyrolysis device 9 uses the high temperature and high enthalpy environment provided by the plasma to pyrolyze the hydrocarbon raw materials therein to generate pyrolysis gas; the pyrolysis gas enters the pyrolysis gas purification and separation device 10 for purification and separation, and the separated acetylene enters the acetylene storage tank 11 for storage; the remaining pyrolysis gas enters other pyrolysis gas storage tanks 12.

[0047] The thermal power plant system includes coal-fired power plants, gas turbine power plants, IGCC power plants, biomass power plants, waste incineration power plants and other power plants.

[0048] The plasma pyrolysis device is used to process any one or a combination of materials containing carbon and hydrogen elements, such as waste tires, solid waste, hazardous waste, and biomass.

[0049] The product gas of the plasma pyrolysis device contains acetylene and one or more of ethylene, methane, hydrogen, ethane, propane and propylene. Acetylene is sold to increase the revenue of the power plant; the pyrolysis gas other than acetylene can be sent to the combustion device of the power plant as fuel by the peak-shaving and frequency-regulating control module to control the flow rate, thereby increasing the power generation output.

[0050] Among them, the plasma pyrolysis device increases the power when electricity consumption is low or in excess, and reduces the power when electricity consumption is peak; the pyrolysis gases other than acetylene sent from the pyrolysis gas storage tank to the power plant combustion device have their flow rate reduced when electricity consumption is low or in excess, and their flow rate increased when electricity consumption is peak.

[0051] Among them, the combustion devices of power plants include combustion furnaces in coal-fired power plants, gas turbines in gas-fired power plants, gas turbines in IGCC power plants, incinerators in waste incineration power plants, combustion furnaces in biomass power plants, etc.

[0052] In this embodiment, a peak-shaving and frequency-regulating method of a peak-shaving and frequency-regulating system of a coupled plasma pyrolysis device in a thermal power plant includes:

[0053] When the power grid requires the thermal power plant to reduce load, peak and regulate frequency, the power of the plasma pyrolysis device 9 is increased through the peak and frequency regulation control module to make it take away more electricity, and at the same time, the flow of other pyrolysis gases sent to the combustion device 13 is reduced to reduce the output power of the gas generator and steam generator, thereby reducing the total output power of the thermal power plant. At this time, the flow of other pyrolysis gases entering other pyrolysis gas storage tanks 12 increases, and the flow of other pyrolysis gases flowing from other pyrolysis gas storage tanks 12 to the combustion device 13 decreases, the input is greater than the output, and the other pyrolysis gas reserves in other pyrolysis gas storage tanks 12 increase, so as to make reserves for load increase, peak and frequency regulation;

[0054] When the power grid requires the thermal power plant to increase the load for peak load regulation and frequency modulation, the power of the plasma pyrolysis device 9 is reduced through the peak load regulation and frequency modulation control module to reduce the power it divides, and at the same time, the flow of other pyrolysis gases sent to the combustion device 13 is increased to increase the output power of the gas generator and steam generator, thereby increasing the total output power of the thermal power plant. At this time, the flow of other pyrolysis gases entering other pyrolysis gas storage tanks 12 is reduced, and the flow of other pyrolysis gases flowing from other pyrolysis gas storage tanks 12 to the combustion device 13 is increased, the input is less than the output, and the other pyrolysis gas reserves in other pyrolysis gas storage tanks 12 are reduced.

[0055] Example 1

[0056] See also Figure 2 As shown, the present invention provides a peak-shaving and frequency-modulating system for a thermal power plant coupled plasma pyrolysis device, comprising a thermal power plant system and a plasma pyrolysis system;

[0057] The thermal power plant system includes a coal pretreatment device 1, a gasifier 2, a waste heat boiler 3, a dust removal and desulfurization purification device 4, a gas turbine 5 and a waste heat boiler 6 which are connected in sequence; the gas turbine 5 and the waste heat boiler 6 are respectively connected to a gas generator 7 and a steam generator 8; the plasma pyrolysis system includes a plasma pyrolysis device 9, a pyrolysis gas purification and separation device 10, an acetylene storage tank 11 and other pyrolysis gas storage tanks 12.

[0058] The outlet of the coal pretreatment equipment 1 is connected to the first inlet of the waste heat boiler 3 through the gasifier 2, and the second inlet of the waste heat boiler 3 is connected to the second outlet of the plasma pyrolysis device 9; the first outlet of the waste heat boiler 3 is connected to the dust removal and desulfurization purification equipment 4, the gas turbine 5 and the waste heat boiler 6 in sequence; the second outlet of the waste heat boiler 3 is a steam outlet, connected to the steam inlet of the waste heat boiler 6. The inlet of the plasma pyrolysis device 9 is connected to the hydrocarbon raw material; the first outlet of the plasma pyrolysis device 9 is connected to the inlet of the pyrolysis gas purification and separation device 10, and the acetylene outlet of the pyrolysis gas purification and separation device 10 is connected to the acetylene storage tank 11; the other pyrolysis gas outlets of the pyrolysis gas purification and separation device 10 are connected to other pyrolysis gas storage tanks 12. The outlets of other pyrolysis gas storage tanks 12 are connected to the gas inlet of the gas turbine 5.

[0059] After being pretreated by the coal pretreatment equipment 1, the coal enters the gasifier 2 to react and generate coal gas; the plasma pyrolysis device 9 uses the high temperature and high enthalpy environment provided by the plasma to pyrolyze the hydrocarbon raw materials therein to generate pyrolysis gas; the temperature range of the plasma is 1000K~4000K, and the gas excited to form the plasma is any one of argon, hydrogen, carbon dioxide, water vapor and the like and their combination; the waste heat boiler 3 absorbs the waste heat of the coal gas in the gasifier 2 and the pyrolysis gas of the plasma pyrolysis device 9 and produces water vapor to be transported to the waste heat boiler 6; the pyrolysis gas after absorbing the waste heat enters the pyrolysis gas purification and separation device 10 for purification and separation, and the separation The separated acetylene enters the acetylene storage tank 11 for storage; the remaining pyrolysis gas enters other pyrolysis gas storage tanks 12; the coal gas after absorbing waste heat is desulfurized and dust-removed by the dust removal and desulfurization purification equipment 4 and then enters the gas turbine 5 for combustion and work, and the pyrolysis gas in other pyrolysis gas storage tanks 12 also enters the gas turbine 5 for combustion and work; the high-temperature flue gas obtained by the combustion of the gas in the gas turbine 5 drives the gas generator 7 to rotate and generate electricity, and the high-temperature exhaust gas discharged after the gas turbine 5 burns and generates electricity enters the waste heat boiler 6 to heat the medium water in the waste heat boiler into superheated steam, and the superheated steam drives the steam generator 8 to rotate and generate electricity; the outlet lines of the gas generator 7 and the steam generator 8 are connected to the power grid to supply power to the power grid.

[0060] Among them, other pyrolysis gas is sent to the gas turbine 5 through the pyrolysis gas storage tank 12, and the output of the system is adjusted by adjusting the flow rate of this part of the pyrolysis gas.

[0061] Among them, the system also includes a peak-shaving and frequency-regulating control module, which controls the increase or decrease of the electric load power delivered by the power plant to the plasma pyrolysis device and the flow rate delivered by the product gas storage tank to the thermal power plant system, thereby responding to the power grid's peak-shaving and frequency-regulating load requirements for the thermal power plant.

[0062] In this embodiment, a peak-shaving and frequency-regulating method of a peak-shaving and frequency-regulating system of a coupled plasma pyrolysis device in a thermal power plant includes:

[0063] When the power grid requires the thermal power plant to reduce load, peak and regulate frequency, the power of the plasma pyrolysis device 9 is increased through the peak and frequency regulation control module to make it take away more electricity, and at the same time, the flow of other pyrolysis gases sent to the gas turbine 5 is reduced to reduce the output power of the gas generator and steam power generation, thereby reducing the total output power of the thermal power plant. At this time, the flow of other pyrolysis gases entering other pyrolysis gas storage tanks 12 increases, and the flow of other pyrolysis gases flowing from other pyrolysis gas storage tanks 12 to the gas turbine 5 decreases. The input is greater than the output, and the reserves of other pyrolysis gases in other pyrolysis gas storage tanks 12 increase to make reserves for load increase, peak and frequency regulation;

[0064] When the power grid requires the thermal power plant to increase the load for peak load regulation and frequency modulation, the power of the plasma pyrolysis device 9 is reduced through the peak load regulation and frequency modulation control module to reduce the power it divides, and at the same time, the flow of other pyrolysis gases sent to the gas turbine 5 is increased to increase the output power of the gas generator and steam generator, thereby increasing the total output power of the thermal power plant. At this time, the flow of other pyrolysis gases entering other pyrolysis gas storage tanks 12 is reduced, and the flow of other pyrolysis gases flowing from other pyrolysis gas storage tanks 12 to the gas turbine 5 is increased, the input is less than the output, and the other pyrolysis gas reserves in other pyrolysis gas storage tanks 12 are reduced;

[0065] Specifically, the peak-shaving and frequency-modulating method is performed according to the following steps:

[0066] When the power grid requires thermal power plants to reduce load, peak and frequency, that is, the amount of electricity on the grid P 上 Need to reduce ΔP 上 When the peak-shaving and frequency-regulating control module is used to increase the power of the plasma pyrolysis device to increase ΔP 等 At the same time, the flow rate of other pyrolysis gases sent to the combustion device of the power plant is reduced to reduce the output of the combustion device, thereby reducing the total output power of the thermal power plant by ΔP 火 Finally, the changes in the above electrical quantities satisfy the following equation:

[0067] ΔP 上 =ΔP 等 +ΔP 火

[0068] The values ​​of each change in electrical quantity in the formula are all absolute values, that is, positive numbers.

[0069] In this case, the flow rate of pyrolysis gas entering the pyrolysis gas storage tank increases, and the flow rate of other pyrolysis gases except acetylene flowing from the pyrolysis gas storage tank to the combustion device of the power plant decreases. The former is greater than the latter, and the reserves of other pyrolysis gases in the pyrolysis gas storage tank increase.

[0070] When the power grid requires thermal power plants to increase load, peak and frequency regulation, that is, the amount of electricity on the grid P 上 Need to increase ΔP 上 When the peak frequency modulation control module is used to increase the power of the plasma pyrolysis furnace to reduce ΔP 等 At the same time, the flow rate of other pyrolysis gases sent to the combustion device of the power plant is increased to increase the output of the combustion device, so that the total output power of the thermal power plant increases by ΔP 火 Finally, the changes in the above electrical quantities satisfy the following equation:

[0071] ΔP 上 =ΔP 等 +ΔP 火

[0072] The values ​​of each change in electrical quantity in the formula are all absolute values, that is, positive numbers.

[0073] In this case, the pyrolysis gas flow entering the pyrolysis gas storage tank decreases, and the flow of other pyrolysis gases except acetylene flowing from the pyrolysis gas storage tank to the combustion device of the power plant increases. The former is smaller than the latter, and the reserves of other pyrolysis gases in the pyrolysis gas storage tank decreases.

[0074] Example 2

[0075] See also Figure 3 As shown, the present invention provides a peak-shaving and frequency-regulating system of a thermal power plant coupled plasma pyrolysis device, including a thermal power plant system and a plasma pyrolysis system; the difference from Example 1 is that the thermal power plant system only includes a gas turbine 5, a waste heat boiler 6, a gas generator 7 and a steam generator 8; wherein the gas turbine 5 and the waste heat boiler 6 are connected to the gas generator 7 and the steam generator 8 respectively. The gas inlet of the gas turbine 5 inputs other pyrolysis gas and methane / hydrogen stored in other pyrolysis gas storage tanks 12.

[0076] Methane / hydrogen is transported into the gas turbine 5, and waste heat generated during the operation of the gas turbine 5 enters the waste heat boiler 6. The gas turbine 5 is connected to the gas generator 7, and the waste heat boiler 6 is connected to the steam generator 8. The two generators are connected to the bus, and the bus is connected to the power grid and the plasma pyrolysis device 9. The hydrocarbon raw material is placed in the plasma pyrolysis device 9 and decomposed into pyrolysis gas. After the pyrolysis gas is purified and separated by the pyrolysis gas purification and separation device 10, acetylene enters the acetylene storage tank 11 for sale, and other pyrolysis gas is sent to the gas turbine 5 as supplementary fuel through other pyrolysis gas storage tanks 12, which plays a role in regulating the output of the gas turbine.

[0077] In this embodiment, a peak-shaving and frequency-regulating method of a peak-shaving and frequency-regulating system of a coupled plasma pyrolysis device in a thermal power plant includes:

[0078] When the power grid requires the thermal power plant to reduce load, peak and regulate frequency, the power of the plasma pyrolysis device 9 is increased through the peak and frequency regulation control module to make it take away more electricity, and at the same time, the flow of other pyrolysis gases sent to the gas turbine 5 is reduced to reduce the output power of the gas generator and steam power generation, thereby reducing the total output power of the thermal power plant. At this time, the flow of other pyrolysis gases entering other pyrolysis gas storage tanks 12 increases, and the flow of other pyrolysis gases flowing from other pyrolysis gas storage tanks 12 to the gas turbine 5 decreases. The input is greater than the output, and the reserves of other pyrolysis gases in other pyrolysis gas storage tanks 12 increase to make reserves for load increase, peak and frequency regulation;

[0079] When the power grid requires the thermal power plant to increase the load for peak load regulation and frequency modulation, the power of the plasma pyrolysis device 9 is reduced through the peak load regulation and frequency modulation control module to reduce the power it divides, and at the same time, the flow of other pyrolysis gases sent to the gas turbine 5 is increased to increase the output power of the gas generator and steam power generation, thereby increasing the total output power of the thermal power plant. At this time, the flow of other pyrolysis gases entering other pyrolysis gas storage tanks 12 is reduced, and the flow of other pyrolysis gases flowing from other pyrolysis gas storage tanks 12 to the gas turbine 5 is increased, the input is less than the output, and the other pyrolysis gas reserves in other pyrolysis gas storage tanks 12 are reduced.

[0080] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0081] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A peak-shaving and frequency-modulating system for a coupled plasma pyrolysis device in a thermal power plant, characterized in that: Including thermal power plant systems and plasma pyrolysis systems; The plasma pyrolysis system comprises a plasma pyrolysis device (9), a pyrolysis gas purification and separation device (10), an acetylene storage tank (11) and other pyrolysis gas storage tanks (12); the pyrolysis gas outlet of the plasma pyrolysis device (9) is connected to the inlet of the pyrolysis gas purification and separation device (10), the acetylene outlet of the pyrolysis gas purification and separation device (10) is connected to the acetylene storage tank (11); and other pyrolysis gas outlets of the pyrolysis gas purification and separation device (10) are connected to other pyrolysis gas storage tanks (12); The other pyrolysis gas storage tank (12) is connected to the gas inlet of the thermal power plant system; The power output port of the thermal power plant system is connected to the power supply port of the plasma pyrolysis device (9); The thermal power plant system includes a coal pre-treatment device (1), a gasifier (2), a waste heat boiler (3), a dust removal and desulfurization purification device (4), a gas turbine (5) and a waste heat boiler (6) which are connected in sequence; The gas turbine (5) and the waste heat boiler (6) are connected to a gas generator (7) and a steam generator (8) respectively; The outlet of the coal pretreatment equipment (1) is connected to the first inlet of the waste heat boiler (3) through the gasifier (2); the coal gas outlet of the waste heat boiler (3) is connected to the dust removal and desulfurization purification equipment (4), the gas turbine (5) and the waste heat boiler (6) in sequence; the steam outlet of the waste heat boiler (3) is connected to the steam inlet of the waste heat boiler (6); The waste heat boiler (3) also includes a heat exchange circuit for performing heat exchange with the pyrolysis gas of the plasma pyrolysis device (9); A flow regulating valve is provided in the pipeline connecting the other pyrolysis gas storage tank (12) to the gas inlet of the thermal power plant system; A power regulating switch is provided on the power supply line connecting the power output port of the thermal power plant system to the power supply port of the plasma pyrolysis device (9); The thermal power plant system includes a combustion device (13), a gas engine / steam turbine (14) and a generator (15); The input port of the combustion device (13) is connected to a fuel pipeline and other pyrolysis gas storage tanks (12); the output port of the combustion device (13) is connected to a gas engine / steam turbine (14), and the gas engine / steam turbine (14) is connected to a generator (15); and the power output port of the generator (15) is connected to a power supply port of the plasma pyrolysis device (9).

2. The peak-shaving and frequency-modulating system of the coupled plasma pyrolysis device of a thermal power plant according to claim 1, characterized in that: The thermal power plant system is a coal-fired power plant, a gas turbine power plant, an IGCC power plant, a biomass power plant or a waste incineration power plant.

3. The peak-shaving and frequency-modulating system of the coupled plasma pyrolysis device of a thermal power plant according to claim 1, characterized in that: The pyrolysis gas from the plasma pyrolysis device (9) contains acetylene and one or more of ethylene, methane, hydrogen, ethane, propane and propylene.

4. The peak-shaving and frequency-modulating system of the coupled plasma pyrolysis device of a thermal power plant according to claim 1, characterized in that: The raw materials used by the plasma pyrolysis device (9) are any one or more of waste tires, solid wastes, hazardous wastes and biomass containing carbon and hydrogen elements.

5. The peak-shaving and frequency-modulating method of the peak-shaving and frequency-modulating system of the coupled plasma pyrolysis device of a thermal power plant according to any one of claims 1 to 4, characterized in that: include: When the power grid requires thermal power plants to reduce load, peak and adjust frequency: the amount of electricity on the grid P 上 Reduce △P 上 When the power of the plasma pyrolysis device (9) is increased to increase ΔP 等 At the same time, the flow rate of other pyrolysis gases sent to the thermal power plant is reduced, so that the total output power of the thermal power plant is reduced by ΔP 火 , and finally the changes in the above electrical quantities satisfy the following equation: △P 上 =△P 等 +ΔP 火 In the formula, the values ​​of each change in electric quantity are all absolute values; in this case, the flow rate of other pyrolysis gas entering other pyrolysis gas storage tanks (12) increases, and the flow rate of other pyrolysis gas flowing from other pyrolysis gas storage tanks (12) to the thermal power plant decreases, the input is greater than the output, and the other pyrolysis gas reserves in other pyrolysis gas storage tanks (12) increase, which is used as a reserve for load peak regulation and frequency regulation; When the power grid requires thermal power plants to increase load, peak and frequency regulation: the amount of electricity on the grid P 上 Need to increase △P 上 When the power of the plasma pyrolysis device (9) is reduced to reduce ΔP 等 At the same time, the flow rate of other pyrolysis gas sent to the thermal power plant is increased to increase the output of the thermal power plant, so that the total output power of the thermal power plant increases by ΔP 火 , and finally the changes in the above electrical quantities satisfy the following equation: △P 上 =△P 等 +ΔP 火 In this case, the flow rate of other pyrolysis gas entering other pyrolysis gas storage tanks (12) decreases, and the flow rate of other pyrolysis gas flowing from other pyrolysis gas storage tanks (12) to the thermal power plant increases. The input is less than the output, and the reserves of other pyrolysis gas in other pyrolysis gas storage tanks (12) decrease.

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