CN214196426U - Integrated system for air separation energy storage coupling oxygen-enriched combustion carbon capture of thermal power plant - Google Patents
Integrated system for air separation energy storage coupling oxygen-enriched combustion carbon capture of thermal power plant Download PDFInfo
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- CN214196426U CN214196426U CN202120128807.9U CN202120128807U CN214196426U CN 214196426 U CN214196426 U CN 214196426U CN 202120128807 U CN202120128807 U CN 202120128807U CN 214196426 U CN214196426 U CN 214196426U
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Abstract
The utility model discloses an integrated system for air separation energy storage coupling oxygen-enriched combustion carbon capture in a thermal power plant, wherein a boiler is connected with a turbine which is connected with a generator; the output end of the generator is divided into two paths, one path can be connected with a power grid, and the other path is connected with an air separation device; the air separation device is connected with the oxygen storage tank and the explosion-proof booster fan, a first explosion-proof regulating valve and a second explosion-proof regulating valve are respectively arranged on a connecting pipeline of the air separation device and the oxygen storage tank and a pipeline of the air separation device connected with the explosion-proof booster fan, an outlet of the oxygen storage tank is connected with the explosion-proof booster fan, and a third explosion-proof regulating valve is arranged on the connecting pipeline; the oxygen inlet of the blower boiler is connected, and the outlet of the explosion-proof booster fan is communicated with the outlet of the blower; the flue gas treatment system is connected with a flue gas outlet of the boiler, and the tail gas separation and recovery system is connected with an outlet of the flue gas treatment system. The utility model discloses simple structure has solved the degree of depth peak shaver promptly, has realized again that carbon emission reduction and effect are good, and whole economic benefits is better.
Description
Technical Field
The utility model belongs to the degree of depth peak shaving field of thermal power plant relates to the empty energy storage coupling oxygen boosting burning carbon entrapment integration system that divides of thermal power plant.
Background
Aiming at the key policy requirements of carbon emission reduction proposed at present, the thermal power generating unit is the most important object for controlling carbon emission, and carbon emission reduction cannot be realized by using the traditional technology. With the change of national power policy in recent years, the main functions of the thermal power plant are changed at the same time, and the main power of power supply is changed into the main power of power supply to participate in the deep peak regulation in cooperation with a power grid. Meanwhile, the policy of subsidizing the electricity price of the advanced peak regulation of the national platform greatly stimulates the enthusiasm of the thermal power plant for carrying out the advanced peak regulation reconstruction of the unit. At present, thermal power faces the risk of excess of productivity and structurality, and new energy faces great consumption pressure. The thermal power is bound to give way for new energy development. Thermal power generating units are subject to deep peaking. For the 'three north' area, the wind-fire contradiction of the heating period is particularly prominent, the period with the best wind power resource is the winter heating period, in addition, the proportion of the provincial thermoelectric units is too high, peak-shaving power sources of other categories are relatively deficient, the continuously increased heating demand and the continuously increased clean energy installation are caused, and the peak-shaving space is very limited. Particularly, in northeast regions, most thermal power is combined heat and power generation units, the peak regulation capacity is only 10%, new energy storage consumption and new energy increment development are influenced, and a hard gap of the peak regulation capacity causes severe electricity limitation of new energy in partial regions, so that the thermoelectric units can realize deep peak regulation only through transformation.
At present, a unit participating in deep peak shaving runs for a long time deviating from a design value, so that the safety and the economy of the unit are reduced. However, the existing technical route which gives consideration to deep peak regulation and carbon emission reduction of the thermal power generating unit is still in an exploration stage, and an economical and feasible technical route is not provided.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide the empty energy storage coupling oxygen boosting burning carbon entrapment integration system that divides of thermal power plant, this system can satisfy the nimble requirement of degree of depth peak shaving of thermal power plant unit, has realized again that carbon reduces discharging and effect is good, and has the higher characteristics of security, economic nature.
The utility model adopts the technical scheme as follows:
the integrated system comprises a boiler, a turbine, a generator, an air separation device, an oxygen storage tank, an explosion-proof booster fan, a blower, a flue gas treatment system and a tail gas separation and recovery system, wherein the boiler is connected with the turbine which is connected with the generator; the output end of the generator is divided into two paths, one path can be connected with a power grid, and the other path is connected with an air separation device; the air separation device is connected with the oxygen storage tank and the explosion-proof booster fan, a first explosion-proof regulating valve and a second explosion-proof regulating valve are respectively arranged on a connecting pipeline of the air separation device and the oxygen storage tank and a pipeline of the air separation device connected with the explosion-proof booster fan, an outlet of the oxygen storage tank is connected with the explosion-proof booster fan, and a third explosion-proof regulating valve is arranged on the connecting pipeline; the oxygen inlet of the blower boiler is connected, and the outlet of the explosion-proof booster fan is communicated with the outlet of the blower; the flue gas treatment system is connected with a flue gas outlet of the boiler, the tail gas separation and recovery system is connected with an outlet of the flue gas treatment system, and the tail gas separation and recovery system is further connected with the generator.
Preferably, a first inverter and a first power switch are arranged on one path of line of the output end of the generator, which can be connected with a power grid.
Preferably, a second inverter and a second power switch are arranged on a line connecting the generator and the air separation unit.
Preferably, the outlet of the oxygen storage tank is also provided with a pipeline connected with an oxygen user, and the pipeline is provided with a fourth explosion-proof regulating valve.
Preferably, the air separation plant is further connected with a nitrogen storage tank, and a fifth explosion-proof regulating valve is arranged on a pipeline connecting the air separation plant and the nitrogen storage tank.
Preferably, the outlet of the nitrogen storage tank is provided with a pipeline connected with a nitrogen user, and the pipeline is provided with a sixth explosion-proof regulating valve.
Preferably, the flue gas treatment system comprises a condenser, a dust removal device and an integrated pollutant removal device, wherein an inlet of the condenser is connected with a flue gas outlet of the boiler, an inlet of the dust removal device is connected with a gas outlet of the condenser, and a gas outlet of the dust removal device is connected with a gas inlet of the integrated pollutant removal device.
Preferably, the air separation device comprises an air compressor, a heat exchanger, an expander and a first cryogenic distillation tower, the air compressor is connected with the heat exchanger, the heat exchanger is connected with the expander, the expander is connected with the first cryogenic distillation tower, the air compressor is further connected with a generator, and a nitrogen outlet of the first cryogenic distillation tower is connected with a nitrogen storage tank.
Preferably, the tail gas separation and recovery system comprises CO2A compressor and a second cryogenic distillation tower, the inlet of the second cryogenic distillation tower is connected with the gas outlet of the integrated pollutant removal device, the second cryogenic distillation tower is provided with a nitrogen outlet and CO2The outlet of the second cryogenic distillation tower is connected with the nitrogen storage tank and the CO of the second cryogenic distillation tower2Outlet and CO2Compressor inlet connection, CO2The compressor is also connected with the generator and the expander respectively.
The utility model discloses following beneficial effect has:
the utility model discloses empty energy storage coupling oxygen boosting burning carbon entrapment integration integrated system that divides of thermal power plant is through setting up air separation plant, when the unit needs carry out degree of depth peak regulation, passes through air separation plant with part generated energy and dissolves, utilizes empty the dividingThe device can separate the air, obtains producing the high oxygen of practical value, can store the partly oxygen that obtains through setting up the oxygen holding vessel, through setting up explosion-proof booster fan and forced draught blower, can send into the boiler with the partly sample gas that air separation plant separation obtained and carry out the oxygen boosting burning, improves boiler efficiency, reduces the pollutant emission, reduces carbon and discharges, and whole economic benefits is than. When the unit needs the generated energy, steerable air separation plant stop work, can send the oxygen of storing in the oxygen storage tank into the boiler through explosion-proof booster fan and forced draught blower and carry out the oxygen boosting burning this moment, improve boiler efficiency, reduce the pollutant and discharge, reduce carbon and discharge, whole economic benefits is than. To sum up, the utility model discloses an empty energy storage coupling oxygen enrichment of thermal power plant burns carbon entrapment integration integrated system no matter is when degree of depth peak shaving or needs the generated energy, and the boiler homoenergetic can carry out the oxygen boosting burning, has improved the utilization ratio of fuel and the efficiency of boiler. In addition, the flue gas treatment system and the tail gas separation and recovery system can purify the boiler flue gas and nitrogen and CO in the boiler flue gas2Is recovered so that CO produced by combustion2The method can be used for trapping and sealing, reduces carbon emission, simultaneously recovers nitrogen brought by air during combustion, can be used for other purposes, improves the utilization rate of energy and reduces the waste of resources. To sum up, the utility model discloses the empty energy storage coupling oxygen boosting burning carbon entrapment integration integrated system that divides of thermal power plant can improve boiler efficiency, and the pollutant that reduces discharges, reduces carbon and discharges, and has that the system is simple, energy utilization is efficient, the big, the carbon of degree of depth peak regulation potentiality reduces discharging and the effectual characteristics of entrapment, and security and economic nature are higher simultaneously.
Drawings
FIG. 1 is the utility model discloses the structure schematic diagram of the empty energy storage coupling oxygen boosting burning carbon entrapment integration integrated system that divides of thermal power plant.
Fig. 2 is the structure schematic diagram of the air separation plant of the utility model.
Wherein, 1 is a boiler, 2 is a turbine, 3 is a generator, 4 is a first inverter, 5 is a first power switch, 6 is a power grid, 7 is a second inverter, 8 is a second power switch, 9 is an air separation device, and 10 is nitrogen storageA tank, 11 is an oxygen storage tank, 12 is an explosion-proof booster fan, 13 is a blower, 14 is a condenser, 15 is a dust removal device, 16 is an integrated pollutant removal device, and 17 is CO2The system comprises a compressor, a fifth explosion-proof regulating valve 18, a sixth explosion-proof regulating valve 19, a first explosion-proof regulating valve 20, a fourth explosion-proof regulating valve 21, a third explosion-proof regulating valve 22, a second explosion-proof regulating valve 23, an air low-pressure compressor 24, a low-temperature heat exchanger 25, an air high-pressure compressor 26, a high-temperature heat exchanger 27, an expander 28, a first low-temperature distillation tower 29 and a second low-temperature distillation tower 30.
Detailed Description
The invention is further described with reference to the following figures and examples.
Referring to fig. 1, the utility model discloses an integrated system of thermal power plant's air separation energy storage coupling oxygen boosting burning carbon entrapment, including boiler 1, turbine 2, generator 3, air separation plant 9, oxygen holding vessel 11, explosion-proof booster fan 12, forced draught blower 13, flue gas processing system and tail gas separation recovery system, boiler 1 connects turbine 2, and turbine 2 connects generator 3; the output end of the generator 3 is divided into two paths, one path can be connected with the power grid 6, and the other path is connected with the air separation device 9; the air separation device 9 is connected with the oxygen storage tank 11 and the explosion-proof booster fan 12, a first explosion-proof regulating valve 20 and a second explosion-proof regulating valve 23 are respectively arranged on a connecting pipeline of the air separation device 9 and the oxygen storage tank 11 and a pipeline of the air separation device 9 connected with the explosion-proof booster fan 12, an outlet of the oxygen storage tank 11 is connected with the explosion-proof booster fan 12, and a third explosion-proof regulating valve 22 is arranged on the connecting pipeline; the oxygen inlet of the boiler 1 is connected with a blower 13, and the outlet of the explosion-proof booster fan 12 is communicated with the outlet of the blower 13; the flue gas treatment system is connected with a flue gas outlet of the boiler 1, the tail gas separation and recovery system is connected with an outlet of the flue gas treatment system, and the tail gas separation and recovery system is also connected with the generator 3.
As the utility model discloses preferred embodiment, be equipped with first dc-to-ac converter 4 and first switch 5 on the circuit of the same kind that the generator 3 output can be connected with electric wire netting 6, can control the logical/open circuit between generator 3 and the electric wire netting 6 through first switch 5.
As the utility model discloses preferred embodiment, be equipped with second dc-to-ac converter 7 and second switch 8 on the circuit that generator 3 and air separation plant 9 are connected, can realize through second dc-to-ac converter 7 and second switch 8 that generator 3 supplies power to air separation plant 9 for air separation plant 9 works, need not additionally provide the power to air separation plant 9, can control the logical/open circuit between generator 3 and the air separation plant 9 through second switch 8, let its work when needing air separation plant 9 during operation, do not need the during operation stop work.
As the utility model discloses preferred embodiment, the export of oxygen storage tank 11 still is equipped with the pipeline of being connected with the oxygen user, is equipped with fourth explosion-proof regulating valve 21 on this pipeline, can carry out rational utilization with the unnecessary oxygen of storing in the oxygen storage tank 11 through this pipeline and fourth explosion-proof regulating valve 21, practices thrift the cost and can create certain economic benefits.
As the utility model discloses preferred embodiment, air separation plant 9 still is connected with nitrogen gas holding vessel 10, is equipped with the explosion-proof governing valve 18 of fifth on the pipeline that air separation plant 9 and nitrogen gas holding vessel 10 are connected, utilizes nitrogen gas holding vessel 10 can also store the nitrogen gas that air separation plant 9 separated out, then utilizes or sells, also can practice thrift the cost and can create some economic benefits.
As the utility model discloses preferred embodiment, the export of nitrogen gas holding vessel 10 is equipped with the pipeline of being connected with the nitrogen gas user, is equipped with sixth explosion-proof governing valve 19 on this pipeline, consequently can directly provide the nitrogen gas user with the nitrogen gas in the nitrogen gas holding vessel 10, creates certain economic benefits.
As the preferred embodiment of the utility model, the flue gas treatment system comprises a condenser 14, a dust removal device 15 and an integrated pollutant removal device 16, the inlet of the condenser 14 is connected with the flue gas outlet of the boiler 1, the inlet of the dust removal device 15 is connected with the gas outlet of the condenser 14, and the gas outlet of the dust removal device 15 is connected with the gas inlet of the integrated pollutant removal device 16; can be with the aqueous vapor separation in the boiler flue gas and cool down the flue gas through condenser 14, can get rid of the particulate matter in the flue gas after the cooling through dust collector 15, integrated pollutant removing device can be with removing dustRemoving water, dust and pollutants in the flue gas to obtain pure CO2And the tail gas separation and recovery system can separate pure CO obtained by treatment2Is recycled for other use, realizes CO2Emission reduction of (2) and simultaneous recovery of pure CO2And certain economic benefit can be further generated, and the harm is changed into treasure.
As the preferred embodiment of the present invention, the air separation plant 9 comprises an air compressor, a heat exchanger, an expander 28 and a first cryogenic distillation tower 29, the air compressor is connected to the heat exchanger, the heat exchanger is connected to the expander 28, the expander 28 is connected to the first cryogenic distillation tower 29, the air compressor is further connected to the generator 3, and the nitrogen outlet of the first cryogenic distillation tower 29 is connected to the nitrogen storage tank 10.
As the preferred embodiment of the present invention, the air separation plant 9 can be provided with a multi-stage air compressor and a heat exchanger, and the two-stage air compressor and the heat exchanger are taken as an example for illustration, wherein the two-stage air compressor and the heat exchanger include an air low-pressure compressor 24, a low-temperature heat exchanger 25, an air high-pressure compressor 26 and a high-temperature heat exchanger 27, the air low-pressure compressor 24, the low-temperature heat exchanger 25, the air high-pressure compressor 26 and the high-temperature heat exchanger 27 are sequentially connected, the high-temperature heat exchanger 27 is connected with an expander 28, a gas outlet is provided on the low-temperature distillation tower 29, and the air low-pressure compressor 24 and the air high-pressure compressor 26 are both connected with the generator 3. The low-temperature heat exchanger 25 and the warm heat exchanger 27 can be arranged to cool the compressed air, so that the temperature of the compressed air meets the working requirement of the expansion machine, and meanwhile, the heat energy in the compressed air can be recycled through the refrigerants in the low-temperature heat exchanger 25 and the warm heat exchanger 27, so that energy conservation, emission reduction and effective utilization of energy are realized.
As the preferred embodiment of the utility model, the tail gas separation and recovery system comprises CO2A compressor 17 and a second cryogenic distillation tower 30, wherein the inlet of the second cryogenic distillation tower 30 is connected with the gas outlet of the integrated pollutant removing device 16, and the second cryogenic distillation tower 30 is provided with a nitrogen outlet and a CO outlet2An outlet, a nitrogen outlet of the second cryogenic distillation tower 30 and the nitrogen storage tank 10 are connected with the CO of the second cryogenic distillation tower 302Outlet and CO2Compressor 17 inlet connection, CO2The compressor 17 is also connected to the generator 3 and the expander 28, respectively.
The utility model discloses thermal power plant's empty working method that divides coupling oxygen boosting burning carbon entrapment integration system of energy storage, including following process:
connecting the output end of the generator 3 with a power grid;
when the thermal power generating unit needs deep peak shaving, the air separation unit 9 is enabled to work, the first explosion-proof regulating valve 20 and the second explosion-proof regulating valve 23 are opened, one part of oxygen obtained by the air separation unit 9 is stored in the oxygen storage tank 11, and the other part of oxygen is sent to the inlet of the explosion-proof booster fan 12; after being pressurized by an explosion-proof booster fan 12, oxygen is mixed at the outlet of a blower 13 and is sent to the boiler 1 together for eutrophication combustion;
when the power generation and supply requirements of the thermal power generating unit are increased, the air separation unit 9 stops working, the first explosion-proof regulating valve 20 and the second explosion-proof regulating valve 23 are closed, the third explosion-proof regulating valve 22 is opened, and oxygen in the oxygen storage tank 11 is sent to the inlet of the explosion-proof booster fan 12; after being pressurized by an explosion-proof booster fan 12, oxygen is mixed at the outlet of a blower 13 and is sent to the boiler 1 together for eutrophication combustion;
in the working process of the boiler 1, the tail gas of the boiler 1 is purified and decontaminated by a flue gas treatment system to obtain pure CO2Mixed gas with nitrogen, pure CO2And separating and recovering the mixed gas with the nitrogen by a tail gas separation and recovery system.
As a preferred embodiment of the present invention, when the air separation device 9 and the tail gas separation and recovery system are adopted in the present invention, that is, the air separation device 9 includes an air compressor, a heat exchanger, an expander 28 and a first cryogenic distillation tower 29, the air compressor is connected to the heat exchanger, the heat exchanger is connected to the expander 28, the expander 28 is connected to the first cryogenic distillation tower 29, and the nitrogen outlet of the first cryogenic distillation tower 29 is connected to the nitrogen storage tank 10; the tail gas separation and recovery system comprises CO2A compressor 17 and a second cryogenic distillation tower 30, wherein the inlet of the second cryogenic distillation tower 30 is connected with the gas outlet of the integrated pollutant removing device 16, and the second cryogenic distillation tower 30 is provided with a nitrogen outlet and a CO outlet2An outlet, a nitrogen outlet of the second cryogenic distillation tower 30 and the nitrogen storage tank 10 are connected with the CO of the second cryogenic distillation tower 302Outlet and CO2Compressor 17 inlet connection, CO2The compressor 17 is also connected to the generator 3 and the expander 28, respectively;
when the thermal power generating unit needs deep peak shaving, the air compressor compresses air and exchanges heat by using the heat exchanger, so that the temperature of the compressed air reaches the working temperature of the expansion machine 28, the expansion machine 28 sends the compressed air into the first low-temperature distillation tower 29, the first low-temperature distillation tower 29 separates oxygen and nitrogen from the air, and the nitrogen enters the nitrogen storage tank 10; expander 28 driven CO2The compressor 17 is operated; the second cryogenic distillation tower 30 feeds the separated nitrogen gas into the nitrogen storage tank 10 and the separated CO2Feeding CO2The compressor 17 compresses and recovers the refrigerant. In this embodiment, the expander can use the heat in the compressed air to perform external work to drive the CO2The compressor 17 works, so that redundant energy in the air separation process can be fully utilized, and energy conservation and consumption reduction can be further realized.
When the power generation and supply demand of the thermal power generating unit increases, the expander 28 stops driving the CO2The compressor 17 is operated and the generator 3 drives the CO2The compressor 17 is operated; the second cryogenic distillation tower 30 feeds the separated nitrogen gas into the nitrogen storage tank 10 and the separated CO2Feeding CO2The compressor 17 compresses and recovers the refrigerant.
In the above embodiment, the CO in the treated pure off-gas can be removed by providing the second cryogenic distillation tower 302Separating with nitrogen to obtain CO2Can be treated with CO2The compressor 17 is compressed and then is supplemented with the nitrogen gas, the obtained nitrogen gas can be stored and utilized by the nitrogen gas storage tank 10, therefore, the utility model discloses can also be with higher purity CO in the tail gas2And nitrogen is used for complement and resource utilization, so that the waste of resources is further reduced.
Examples
The integrated system for the thermal power plant air separation energy storage coupling oxygen-enriched combustion carbon capture comprises a boiler 1, a turbine 2, a generator 3 and a second power generation unitAn inverter 4, a first power switch 5, a second inverter 7, a second power switch 8, an air separation device 9, a nitrogen storage tank 10, an oxygen storage tank 11, an explosion-proof booster fan 12, a blower 13, a condenser 14, a dust removal device 15, an integrated pollutant removal device 16, CO2A compressor 17, a second cryogenic distillation column 30 and a plurality of explosion-proof regulating valves; the boiler 1 is connected with a turbine 2, and the turbine 2 is connected with a generator 3. The generator 3 is divided into two paths, one path is connected with the rest power grid 6, and a first inverter 4 and a first power switch 5 are arranged on a connecting line between the generator 3 and the power grid 6; the other path of the generator 3 is connected with an air separation unit 9, and a second inverter 7 and a second power switch 8 are arranged on a line connected between the generator 3 and the air separation unit 9. The flue gas outlet of the boiler 1 is sequentially provided with condensed gas 14, a condenser 14, a dust removal device 15, an integrated pollutant removal device 16, a second low-temperature distillation tower 30 and CO along the flue gas flow direction2A compressor 17, a nitrogen outlet of the second cryogenic distillation tower 30 and the nitrogen storage tank 10 are connected with the CO of the second cryogenic distillation tower 302Outlet and CO2The compressor 17 is connected at the inlet. The outlet of the air separation device 9 is divided into three paths, and one path is connected with a fifth explosion-proof regulating valve 18, a nitrogen storage tank 10 and a sixth explosion-proof regulating valve 19 in sequence to a user; the second path is connected with a first explosion-proof regulating valve 20, an oxygen storage tank 11 and a fourth explosion-proof regulating valve 21 to a user in sequence; and the last path is connected with a second explosion-proof regulating valve 23 and is connected to the explosion-proof booster fan 12. The oxygen storage tank 11 is divided into two paths, one path is directly connected with the explosion-proof regulating valve 21 to a user, and the other path is connected with the explosion-proof regulating valve 22 to the inlet of the booster fan. The blower 13 is connected with the boiler 1 with the explosion-proof booster fan 12 to supply the oxidant for the boiler combustion. In this embodiment, the air separation unit 9 adopts the structural form of the two-stage air compressor and the heat exchanger.
The working method of the air separation energy storage coupling oxygen-enriched combustion carbon capture integrated system of the thermal power plant comprises the following steps:
when the thermal power generating unit needs deep peak regulation, the second power switch 8 is closed to electrify the air separation device 9 to work, the fifth explosion-proof regulating valve 18 is opened, nitrogen is stored in the nitrogen storage tank 10, and the sixth explosion-proof regulating valve 19 is opened if the user needs the nitrogen constantly for the user to make the user useThe application is as follows. The first explosion-proof regulating valve 20 and the second explosion-proof regulating valve 23 are opened, one part of oxygen is stored in the oxygen storage tank 11, and the other part of oxygen is directly fed into the inlet of the explosion-proof booster fan 12. After being pressurized by an explosion-proof booster fan 12, the mixture is mixed at the outlet of a blower 13 and is sent to the boiler 1 together for rich combustion. If the user needs oxygen at all times, the fourth explosion-proof regulating valve 21 is opened for the user to use, and the redundant oxygen is stored in the oxygen storage tank 11. When the air separation device 9 operates, the air low-pressure compressor 24 compresses air at normal temperature and normal pressure to 2-2.5Mpa, the temperature of the compressed air at the outlet of the air low-pressure compressor 24 is 510-560 ℃, the compressed air output by the air low-pressure compressor 24 exchanges heat through the low-temperature heat exchanger 25, and the temperature is controlled to be 200-250 ℃; the compressed air output by the low temperature heat exchanger 25 then enters the air high pressure compressor 26, the air high pressure compressor 26 compresses the air to 4-4.5Mpa, the temperature of the compressed air at the outlet of the air high pressure compressor 26 is 670-; after doing work, the pressure of the outlet exhaust of the expansion machine is 0.1-0.2Mpa, the temperature is 50-100 ℃, the expansion machine 28 sends the compressed air into a first cryogenic distillation tower 29 to separate oxygen and nitrogen, the nitrogen enters a nitrogen storage tank 10, a second cryogenic distillation tower 30 sends the separated nitrogen into the nitrogen storage tank 10, and the separated CO is sent to the nitrogen storage tank 102Feeding CO2The compressor 17 compresses and recovers the refrigerant.
When the power generation and supply requirements of the thermal power generating unit increase, the second power switch 8 is switched off, the air low-pressure compressor 24, the air high-pressure compressor 26 and the expander 28 do not work any more, the boiler 1 operates alone to generate power, and simultaneously CO generates power2The power source of the compressor 17 is switched to the power supply of the generator 3. The fifth explosion-proof regulating valve 18, the first explosion-proof regulating valve 20 and the second explosion-proof regulating valve 23 are closed, the sixth explosion-proof regulating valve 19 and the third explosion-proof regulating valve 22 are opened, and the nitrogen stored in the nitrogen storage tank 10 is used by a user. Oxygen stored in an oxygen storage tank 11 is mixed with air and sent into the furnace 1 through an explosion-proof booster fan 12Rich nutrition and combustion. At the moment, the boiler can still be ensured to be in an oxygen-enriched combustion stage, the boiler efficiency is improved, the pollutant emission is reduced, and the carbon emission is reduced.
The utility model discloses no matter when thermal power generating unit power generation demand is big or needs degree of depth peak regulation, boiler combustion system is in the oxygen boosting burning stage all the time, and the combustion products contains CO more than 80%2The flue gas passes through a condenser 14 to condense all water in the flue gas, and then passes through a dust removal device 15 and an integrated pollutant removal device 16 to condense NO in the flue gasx、SO2Removing to obtain pure CO2Mixed gas with nitrogen, pure CO2The mixed gas with nitrogen is separated and separately recovered through the second cryogenic distillation tower 30, in which CO is passed2The compressor 17 is trapped and sealed to reduce carbon emission, and the nitrogen is sent to the nitrogen storage tank 10 for resource utilization.
In conclusion, the utility model discloses the empty energy storage coupling oxygen boosting burning carbon entrapment integration integrated system that divides of thermal power plant simple structure has solved the degree of depth peak regulation promptly, has realized again that carbon emission reduction and effect are good, and whole economic benefits is better.
Claims (8)
1. An integrated system for air separation energy storage coupling oxygen-enriched combustion carbon capture in a thermal power plant is characterized by comprising a boiler (1), a turbine (2), a generator (3), an air separation device (9), an oxygen storage tank (11), an explosion-proof booster fan (12), a blower (13), a flue gas treatment system and a tail gas separation and recovery system, wherein the boiler (1) is connected with the turbine (2), and the turbine (2) is connected with the generator (3); the output end of the generator (3) is divided into two paths, one path can be connected with a power grid (6), and the other path is connected with an air separation device (9); the air separation device (9) is connected with the oxygen storage tank (11) and the explosion-proof booster fan (12), a first explosion-proof regulating valve (20) and a second explosion-proof regulating valve (23) are respectively arranged on a connecting pipeline of the air separation device (9) and the oxygen storage tank (11) and a pipeline of the air separation device (9) connected with the explosion-proof booster fan (12), an outlet of the oxygen storage tank (11) is connected with the explosion-proof booster fan (12), and a third explosion-proof regulating valve (22) is arranged on the connecting pipeline; the blower (13) is connected with an oxygen inlet of the boiler (1), and an outlet of the explosion-proof booster fan (12) is communicated with an outlet of the blower (13); the flue gas treatment system is connected with a flue gas outlet of the boiler (1), the tail gas separation and recovery system is connected with an outlet of the flue gas treatment system, and the tail gas separation and recovery system is also connected with the generator (3).
2. The integrated system for air separation energy storage coupling oxygen-enriched combustion carbon capture of the thermal power plant according to claim 1, characterized in that a first inverter (4) and a first power switch (5) are arranged on one circuit of which the output end of the generator (3) can be connected with a power grid (6); and a second inverter (7) and a second power switch (8) are arranged on a line connecting the generator (3) and the air separation device (9).
3. The integrated system for air separation energy storage coupling oxygen-enriched combustion carbon capture of the thermal power plant as claimed in claim 1, wherein the outlet of the oxygen storage tank (11) is further provided with a pipeline connected with an oxygen user, and the pipeline is provided with a fourth explosion-proof regulating valve (21).
4. The integrated system for the air separation energy storage coupling oxygen-enriched combustion carbon capture of the thermal power plant as claimed in claim 1, wherein the air separation plant (9) is further connected with a nitrogen storage tank (10), and a fifth explosion-proof regulating valve (18) is arranged on a pipeline connecting the air separation plant (9) and the nitrogen storage tank (10).
5. The thermal power plant air separation energy storage coupling oxygen-enriched combustion carbon capture integrated system as claimed in claim 4, wherein the outlet of the nitrogen storage tank (10) is provided with a pipeline connected with a nitrogen user, and the pipeline is provided with a sixth explosion-proof regulating valve (19).
6. The thermal power plant air separation energy storage coupling oxygen-enriched combustion carbon capture integrated system as claimed in claim 5, wherein the flue gas treatment system comprises a condenser (14), a dust removal device (15) and an integrated pollutant removal device (16), an inlet of the condenser (14) is connected with a flue gas outlet of the boiler (1), an inlet of the dust removal device (15) is connected with a gas outlet of the condenser (14), and a gas outlet of the dust removal device (15) is connected with a gas inlet of the integrated pollutant removal device (16).
7. The thermal power plant air separation energy storage coupling oxygen-enriched combustion carbon capture integrated system is characterized in that the air separation device (9) comprises an air compressor, a heat exchanger, an expansion machine (28) and a first cryogenic distillation tower (29), the air compressor is connected with the heat exchanger, the heat exchanger is connected with the expansion machine (28), the expansion machine (28) is connected with the first cryogenic distillation tower (29), the air compressor is further connected with a generator (3), and a nitrogen outlet of the first cryogenic distillation tower (29) is connected with a nitrogen storage tank (10).
8. The thermal power plant air separation energy storage coupling oxygen-enriched combustion carbon capture integrated system as claimed in claim 7, wherein the tail gas separation and recovery system comprises CO2A compressor (17) and a second cryogenic distillation tower (30), wherein the inlet of the second cryogenic distillation tower (30) is connected with the gas outlet of the integrated pollutant removing device (16), and the second cryogenic distillation tower (30) is provided with a nitrogen outlet and CO2The nitrogen outlet of the second cryogenic distillation tower (30) is connected with the nitrogen storage tank (10) to CO of the second cryogenic distillation tower (30)2Outlet and CO2Inlet connection of compressor (17), CO2The compressor (17) is also connected with the generator (3) and the expander (28) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202120128807.9U CN214196426U (en) | 2021-01-18 | 2021-01-18 | Integrated system for air separation energy storage coupling oxygen-enriched combustion carbon capture of thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120128807.9U CN214196426U (en) | 2021-01-18 | 2021-01-18 | Integrated system for air separation energy storage coupling oxygen-enriched combustion carbon capture of thermal power plant |
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| CN214196426U true CN214196426U (en) | 2021-09-14 |
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