CN116222151A - Cryogenic carbon capture system with large-scale long-period energy storage function and near 0 carbon emission for coal-fired unit - Google Patents
Cryogenic carbon capture system with large-scale long-period energy storage function and near 0 carbon emission for coal-fired unit Download PDFInfo
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- CN116222151A CN116222151A CN202211701848.8A CN202211701848A CN116222151A CN 116222151 A CN116222151 A CN 116222151A CN 202211701848 A CN202211701848 A CN 202211701848A CN 116222151 A CN116222151 A CN 116222151A
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- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
- F02C6/04—Gas-turbine plants providing heated or pressurised working fluid for other apparatus, e.g. without mechanical power output
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
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- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
- F25J3/04157—Afterstage cooling and so-called "pre-cooling" of the feed air upstream the air purification unit and main heat exchange line
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F25J3/04636—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a hybrid air separation unit, e.g. combined process by cryogenic separation and non-cryogenic separation techniques
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
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- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract
The invention discloses a near-0 carbon emission cryogenic carbon trapping system of a coal-fired unit with a large-scale long-period energy storage function, and relates to a low-energy-consumption, low-cost and ultra-large power station boiler smoke-discharging full-scale continuous decarburization coupled with a thermodynamic system of a large-scale and medium-scale coal-fired power generation unit, wherein the coal-fired unit realizes the near-0 carbon emission cryogenic carbon trapping system and has the large-scale long-period energy storage function in a mode of ultra-large scale storage, liquid nitrogen output and liquid oxygen output; the invention belongs to carbon capture after combustion, is easy to realize large-scale and modularized, is suitable for both new high-efficiency coal-fired units and all active coal-fired units with near-zero emission reconstruction of atmospheric pollutants; because nitrogen and oxygen introduce huge cold end 'waste heat' and condensation heat of medium pressure cylinder exhaust steam before entering the energy storage multistage turbine type gas expander, the electric energy fed back by the energy storage synchronous generator to the power grid and the host shaft power increase value caused by the temperature reduction of the circulating water of the indirect air cooling water cooling tower are more likely to exceed the electric energy consumed by producing the liquid nitrogen and the liquid oxygen, namely the apparent energy storage efficiency is more than 100%.
Description
(one) technical field:
the invention discloses a near-0 carbon emission cryogenic carbon trapping system of a coal-fired unit with a large-scale long-period energy storage function, and relates to a low-energy-consumption, low-cost and ultra-large power station boiler smoke-discharging full-scale continuous decarburization coupled with a thermodynamic system of a large-scale and medium-scale coal-fired power generation unit, wherein the coal-fired unit realizes the near-0 carbon emission cryogenic carbon trapping system and has the large-scale long-period energy storage function in a mode of ultra-large scale storage, liquid nitrogen output and liquid oxygen output; and a carbon neutralization technical path which is different from Europe, america and takes abandoned coal as a core is formed, namely, a novel energy supply and absorption system which takes a considerable proportion of high-efficiency near-0 carbon emission coal-fired heat and power cogeneration unit and a pure condensing unit as supports, takes a large-scale wind-light electricity base as a basis and takes a stable, safe and reliable extra-high voltage power transmission and transformation circuit as a carrier is developed and reserved.
(II) background art:
the 2021 China coal-fired generator set provides more than 60 percent of electric quantity and more than 70 percent of peak load with the installed capacity ratio of less than 50 percent; the coal-fired generator set is a main carbon emission source in China, and accounts for 43% of the total amount of carbon emission in China; CO in the exhaust gas of coal-fired power station boiler 2 The emission concentration is about 14% compared with CO in the atmosphere 2 The concentration of 421PPM is much higher.
Atmospheric pollutant near zero emission standard, SO of China coal-fired power station boiler 2 35mg/m 3 、NO x 50mg/m 3 10mg/m of smoke 3 Is the most stringent emission standard worldwide, and by 2021, 12 months, the coal electric motor group with 11 million kW installed capacity in China already meets or is superior to the standard.
The CCUS (Carbon Capture Utilization and Storage carbon capture, utilization and sequestration) is an effective carbon reduction technology, and the global carbon emission reduction cost is multiplied if the CCUS technology is not adopted by the evaluation of the specialized committee for climate change (IPCC) between united states government.
CCUS is currently the only technical choice for achieving low carbonization utilization of fossil energy. The Chinese energy system has huge scale and various requirements, and from the perspective of considering the carbon neutralization target and ensuring the energy safety, a multi-element complementary clean low-carbon, safe and efficient modern energy system taking high-proportion renewable energy as a dominant source, nuclear energy, fossil energy and the like should be actively constructed in the future. In 2019, coal accounts for up to 58% of the consumption of Chinese energy, and fossil energy still plays an important role by 2050 according to the prediction of the existing research, and accounts for 10% -15% of the consumption of Chinese energy. CCUS would be the only technical choice to achieve near zero emissions of this portion of fossil energy. CCUS is a major technical means to maintain power system flexibility under carbon neutralization objectives. The carbon neutralization target requires the power system to realize near zero emission in advance, the proportion of non-fossil power is greatly improved, the uncertainty of the power system at the supply end and the consumption end is obviously increased, and the safety and stability of the power system are affected. The thermal power system is fully considered to realize rapid emission reduction, ensure multiple requirements of flexibility, reliability and the like, the thermal power adding CCUS is an important technical means with competitiveness, near zero carbon emission can be realized, stable clean power is provided, the fluctuation of renewable energy power generation is balanced, and important roles of inertial support, frequency control and the like are played in the aspect of avoiding seasonal or long-term power shortage. CCUS is a viable technical choice for low-carbon transformation in iron and steel cement and other industries which are difficult to reduce emissions. The negative carbon emission technology BECCS of coupling CCUS and new energy is an important technical guarantee for achieving the aim of carbon neutralization.
Among the CCUS technologies, the most critical one is CO 2 Trapping technology.
The main stream of the carbon trapping technology of the coal-fired generator set in the prior art is an alcohol amine absorption method.
Aiming at the problems of higher absorption and regeneration energy consumption, lower oxidation resistance, easy evaporation of absorption materials, stronger corrosion to equipment and the like of the traditional alcohol amine absorption method, the Chinese petrochemical system mainly adopts an MEA (monoethanolamine) method, adds auxiliary components such as active amine, corrosion inhibitor, antioxidant and the like to compound MSA solvent, improves the absorption capacity by 30 percent, reduces the regeneration energy consumption by 20 percent and reduces the oxidative degradation rate from 3.08 percent to 0.52 percent; the japanese CCUS development team found that isophorone diamine solution converts 99% of the carbon dioxide in the air to solid carbamate precipitates, and that the solids scattered in the solution only heated to 60 degrees celsius completely released the captured carbon dioxide, allowing the original liquid to be recovered.
The whole technology of CCUS is still in a condition of high energy consumption and high cost at present, the development is slow for decades, the use ratio of the built demonstration project is low, and the commercialization prospect is not clear; CO is established by China engineering institute 2 Capturing a technical development map, which reveals, presumably from the present The cost of the RMB is 350-400 RMB per ton, the cost can be reduced to about 250 RMB per ton by 2030, and the cost can be reduced to about 100 RMB per ton by 2050 or 2045. In the whole trapping, conveying and injecting process of oil displacement and storage, the trapping cost is about 70%, and if the trapping cost can be greatly reduced, the whole cost of the CCUS is also reduced.
The average price of carbon emission quota (CEA) of nationally unified carbon trade market established in 2021 is less than 60 yuan/ton, obviously the alcohol amine absorption method captures CO 2 The cost of 350-400 yuan/ton cannot be continuously developed. The CCUS technology was first applied to the petroleum industry in the 70 s of the last century to enhance oil field recovery by injecting carbon dioxide into the field. However, the technology, like forest carbon sinks, does not play a critical and substantial role in achieving carbon neutralization. On one hand, the CCUS technology has high cost and does not have economy; on the other hand, carbon sequestration can be achieved on a very limited scale, subject to geological conditions. From the economical aspect, the cost of the CCUS is high, and only the capturing link is added, so that the cost of the coal and electricity project is doubled, and the cost of links such as storage, transportation, sealing and monitoring is not included. I have performed economic slowing evaluation support work on climate change by advanced economics of the inter-government climate change specialized committee (IPCC) slowing working group in 1997, and CCUS is called "earth engineering" in that time, but the cost of the technology has not been reduced significantly in the past decades, and is difficult to have economy in the future. And must not be expected as a primary way of reducing emissions. I consider replacing fossil energy with new energy + stored energy as the main, sole solution towards carbon neutralization.
So far, in 2022 and 11 months, the full continuous decarbonization of the boiler exhaust smoke of large and medium coal-fired units does not exist worldwide, and the project record of nearly 0 carbon emission is realized.
CO when the temperature is higher than 31.1 ℃ and the pressure is higher than 7.38MPa 2 Then enter a supercritical state, and the supercritical state CO is in physical characteristics 2 Has the dual characteristics of gas and liquid; CO 2 Is much lower than the critical temperature and critical pressure of waterThe boundary temperature and the critical pressure are easy to reach and maintain the supercritical state, which is beneficial to engineering application; supercritical CO 2 The liquid has the characteristics of high density, high heat transfer efficiency and strong acting capability; supercritical CO 2 The gas characteristic is achieved, the viscosity is low, the fluidity is high, and the system circulation loss is low; in CO 2 In geological storage, most reservoirs reach CO at temperature and pressure 2 Above the critical point, CO 2 Often stored in the body in a supercritical state.
The biggest feature of new power systems we are struggling to build on the power generation side is the high proportion of clean energy. On one hand, as the economic society advances to a high-quality development stage, the electricity utilization ratio of the third industry and residents is continuously increased, and the load ' peaking ' and seasonal ' characteristics are obvious; the large amount of distributed new energy on the load side is connected to cause the blurring of the source and the load limit, so that the challenges are increased for power supply; on the other hand, the inherent intermittence, volatility and randomness of wind power and photoelectricity lead to the reduction of the stability and controllability of a supply end, the water power output in the period of overlapping withered water is blocked, and the structural electricity shortage of a high-proportion renewable energy power system is easily caused. The flexibility requirement also exhibits time characteristics of different scales, short, medium, long, etc., due to the different time scales and adjustment durations spanned by the power system supply and demand start states.
The investment required by the installed capacity of wind power and photoelectricity per MW is obviously reduced in the last 10 years, and the installed capacity of wind power and photoelectricity and the installed capacity are maintained for years continuously in China for the first time in the world; the wind power and photoelectric plates of the same power generation company are greatly profitable, and the coal and electric plates are greatly deficient and almost become the routine under high coal price; however, wind power, low energy density of photoelectricity, low annual usage hours, and inherent intermittence, volatility, and randomness are not improved; the high-proportion wind power and photoelectricity are required to be provided with high-proportion energy storage and a certain amount of thermal power (comprising coal power, gas power, oil power and combined cycle power generation) with high flexibility as a pressure cabin stone, otherwise, the novel power system cannot safely operate.
The VPP (Virtual Power Plant virtual power plant) is an important means for realizing the aggregation and coordination optimization of resources such as mass distributed new energy, an energy storage system, controllable loads, electric vehicles and the like through advanced information communication and monitoring control technology, and is used as a power coordination management system for a special power plant to participate in the operation of a power system and the trade of an electric power market, and externally presents as a positive and negative controllable power supply, so that the novel power system is an important means for meeting the flexibility requirements of time characteristics of different scales such as short, medium and long.
Based on the energy endowment of multiple coals, oil deficiency and less gas in China, a large-scale carbon trapping technical path with energy conservation and high economy is searched, a carbon trapping system with near 0 carbon emission for a coal-fired unit with technical economy and feasibility is created, and the method has key and substantial significance for ensuring energy safety and constructing a novel power system with high-proportion clean energy in China, realizing carbon peak and carbon neutralization targets early, or redefining green coal electricity, redefining CCUS and redefining flexibility of coal electricity, and has wide market worldwide.
(III) summary of the invention:
the technical problems to be solved are as follows:
the method is characterized by searching a low-energy-consumption, low-cost and ultra-large power station boiler smoke-discharging full-amount continuous decarburization coupled with a thermodynamic system of a large-size and medium-size coal-fired generator set, wherein the coal-fired generator set realizes a deep-cooling carbon trapping system with nearly 0 carbon emission, and has large-scale and long-period energy storage functions in a mode of outputting liquid nitrogen and liquid oxygen in an ultra-large scale.
The technical scheme adopted for solving the technical problems is as follows:
the invention discloses a cryogenic carbon trapping system with near 0 carbon emission of a coal-fired unit with a large-scale long-period energy storage function, which abandons an alcohol amine absorption method and a physical adsorption method and adopts a completely different technical route from the prior art; at normal temperature (20-50 ℃ desulfurizing tower outlet or wet electric dust removing outlet), the clean flue gas of the coal-fired power station boiler meeting the near zero emission standard of atmospheric pollutants is compressed in a heat-insulating way by using a carbon capturing multistage turbine compressor, and is pumped into supercritical CO after absorbing heat and reducing temperature by a group A, a group B and a group C condensing water heater 2 Separator, in supercritical CO 2 In the separator, after a pressure of more than 7.38MPa (due to the heat effect temperature of the gas compression process)The temperature must exceed 31.1 ℃), and the CO in the discharged fume 2 The gas is converted into supercritical fluid, the gravity of the supercritical fluid is two orders of magnitude greater than that of the gas, and the supercritical CO 2 Separated from nitrogen and oxygen in the exhausted smoke and accumulated in supercritical CO 2 A lower portion of the separator; in the exhaust gas of the utility boiler, the main components are nitrogen (about 79 percent) and CO 2 About 14% oxygen (about 6%) and the mass of nitrogen plus oxygen in the flue gas is about CO 2 6 times of the mass, and CO in the whole smoke discharged from the power station boiler is captured by using a smoke discharge compression supercritical phase change method 2 About 30% of the generator output power is consumed, becoming an unacceptably high energy process; in order to effectively reduce the energy consumption of a carbon capture system of a smoke discharge compression supercritical phase transformation method, the invention discovers that useless high-enthalpy nitrogen plus oxygen is expanded to 1ata through a multistage turbine type gas expander in an adiabatic manner to become low-temperature nitrogen plus oxygen, and the low-temperature nitrogen plus oxygen is enough to precool the clean flue gas of a coal-fired power plant boiler which is inhaled from a flue and accords with the near-zero emission standard of atmospheric pollutants through a rotary clean flue gas precooler, and meanwhile, a small amount of water vapor and SO carried in the clean flue gas 2 、SO 3 、NO x And other trace easy-to-condense gas condenses in the cold transfer element of the rotary smoke-purifying precooler, and is discharged from the liquid collecting tank at the bottom of the rotary smoke-purifying precooler, and trace dust in the smoke-purifying is carried and discharged; the volume flow of the purified flue gas after precooling is obviously reduced, the weight is increased, and the shaft power required by the carbon capturing multistage turbine type gas compressor is obviously reduced; the efficiency of the modern high-speed adjustable multi-stage turbine type compressor in a wide working condition range can be 85%, the efficiency of the modern constant-speed multi-stage turbine type gas expander can be 90%, and the electric energy returned by the constant-speed multi-stage turbine type gas expander is reduced by the special rotary type smoke precooler cooling technology, and the electric quantity generated by a main engine is increased by the effective utilization of compression heat by a condensation water heater, so that the actual power consumption of the high-speed adjustable multi-stage turbine type compressor is reduced to 10% or lower of the output power of a generator; 1000MW of one-time reheating ultra-supercritical indirect air-cooled generator set is used for annual utilization hours of 7000 hours, and annual energy generation of 70 hundred million kWh is calculated, and is used for7 hundred million kWh of net electricity consumption of carbon capture, 350 ten thousand tons of CO of carbon capture in year 2 200kWh/t CO 2 For example, the electricity price is calculated as 0.5 yuan/kWh, and is 100 yuan/t CO 2 I.e. the CO has reached the establishment of the Chinese engineering institute 2 Capturing expected values of 2045 years of a technical development map; if the cost of the power generation of the power plant is 0.3 yuan/kWh, the cost is 60 yuan/t CO 2 About 60 yuan per t CO with average price of 2021 Carbon Emission Allowance (CEA) 2 The method is even, and the high-efficiency coal power and the CCUS have basic conditions of market competition with new energy and energy storage in the same field; the full carbon capture electricity consumption of 10% is compared with the pumping energy storage efficiency of 75%, the novel compressed air energy storage efficiency of 70% and the electrochemical energy storage efficiency of 70, and the economy is not necessarily under the wind; or becomes a technical solution for breaking the reality of the safety, environmental protection and economy impossible triangle of the new energy system; in supercritical CO 2 The separator separates all supercritical CO 2 Under the quasi-steady state condition that nitrogen and oxygen with high enthalpy are returned to the imported clean flue gas by the carbon capturing multi-stage turbine type gas expander and the rotary clean flue gas precooler, the inlet shutoff valve of the cryogenic multi-stage turbine type gas compressor is gradually opened, the nitrogen and the oxygen with high enthalpy can be shunted into the cryogenic multi-stage turbine type gas compressor, the rotating speed of the cryogenic multi-stage turbine type gas compressor is controlled by the cryogenic intermediate frequency variable frequency power supply and the cryogenic high-speed synchronous motor, the pressure 1ata in the liquid nitrogen liquid oxygen separator can be maintained, the temperature is minus 196 ℃, and all inert gases such as oxygen, nitrogen and argon are liquefied and stored in the liquid nitrogen liquid oxygen storage tank; the liquid nitrogen liquid oxygen storage tank can be made into hundreds of thousands of meters 3 Even millions of m 3 The liquid nitrogen and liquid oxygen storage tank cluster realizes a large-scale long-period energy storage function; liquid nitrogen-liquid oxygen mixture at normal pressure per m 3 About 201kWh and one million m of cold energy 3 Stored energy up to 201X 10 6 kWh, namely the generated energy generated by millions of units running for 201 hours at full load, the pumped storage power station with the maximum installed capacity does not necessarily have a large-scale long-period energy storage function; the liquid nitrogen and liquid oxygen can be boosted in situ by a liquid nitrogen and liquid oxygen booster pump, gasified by a liquid nitrogen and liquid oxygen gasification heater, overheated by a nitrogen and oxygen superheater, and synchronously generated by an energy storage multistage turbine type gas expander and energy storageThe electric energy stored by the motor is output, the electric energy is essentially that a Rankine cycle taking nitrogen and oxygen elements as working media is sleeved on the original Rankine cycle taking water as working media, and the thermal efficiency of the composite cycle is obviously higher than that of the original single Rankine cycle taking water as working media; the liquid nitrogen liquid oxygen gasification heater also substantially reduces the back pressure of the Rankine cycle which takes water as a working medium, and obviously improves the thermal efficiency of the Rankine cycle which takes water as the working medium; the liquid nitrogen and the liquid oxygen can be output to a remote place through a liquid nitrogen and liquid oxygen remote output pump and a heat insulation pipeline, so that the liquid nitrogen and the liquid oxygen can be used for a remote large-scale concentrated cold source for cooling, the thermal efficiency and the operation flexibility of a remote generator set are improved, and the peak of electricity consumption in summer can be obviously solved;
The invention discloses a near-0 carbon emission cryogenic carbon capture system of a coal-fired unit with a large-scale long-period energy storage function, which is technically characterized by comprising a carbon capture intermediate frequency variable frequency power supply (1), a carbon capture high-speed synchronous motor (2), a carbon capture multistage turbine type gas compressor (3), a cryogenic intermediate frequency variable frequency power supply (4), a cryogenic high-speed synchronous motor (5), a cryogenic multistage turbine type gas compressor (6), a cryogenic multistage turbine type gas expander (7), a cryogenic synchronous generator (8), a liquid nitrogen liquid oxygen separator (9), a condensate water heater (10), a cryogenic multistage turbine type gas compressor inlet shutoff valve (11), an energy storage multistage turbine type gas expander (12), an energy storage synchronous generator (13), a liquid nitrogen liquid oxygen delivery pump (14), a carbon capture synchronous generator (15), a carbon capture multistage turbine type gas expander (16) and supercritical CO 2 Output pump (17), supercritical CO 2 Temporary storage spherical tank (18) and supercritical CO 2 Delivery pump (19), supercritical CO 2 The device comprises a separator (20), a nitrogen-oxygen superheater (21), a rotary flue gas purifying precooler (22), a liquid nitrogen-liquid oxygen gasification heater (23), a liquid nitrogen-liquid oxygen booster pump (24), a liquid nitrogen-liquid oxygen remote output pump (25), a liquid nitrogen-liquid oxygen storage tank (26), a liquid nitrogen-liquid oxygen separator outlet block valve (27), a liquid nitrogen-liquid oxygen separator inlet block valve (28) and a measurement control subsystem; the carbon capturing multistage turbine type gas compressor (3) consists of a coaxial A, B, C compression section and 3 compression sections; the compression section A is of a double-flow channel structure, the 1 st stage and the 2 nd stage long blades are made of aviation forged aluminum, and the compression section B and the compression section C are uniflow, and are martensitic stainless steel blades; the carbon capturing medium frequency variable frequency power supply (1) is connected with the power supply through The carbon capturing high-speed synchronous motor (2) is directly connected with a carbon capturing multistage turbine type gas compressor (3); the carbon capturing multistage turbine type gas compressor (3) and the measurement control subsystem cooperate to ensure the safety and high efficiency of the carbon capturing multistage turbine type gas compressor set under the supercritical pressure working conditions including but not limited to a starting working condition, a supercritical pressure boosting working condition of 0.1MPa to 8.5MPa and the supercritical pressure working condition of 8.5MPa under different smoke load; the whole process is regulated by changing the rotating speed and the compression ratio so as to adapt to different smoke load and supercritical CO 2 The instant pressure of the separator and the reasonable boosting speed; the outlets of the A, B, C compression sections and the 3 compression sections are respectively connected with a condensation water heater (5), which not only can obviously reduce the driving shaft power required by the carbon capture multistage turbine compressor (3), but also can control the supercritical CO 2 Separator (4), supercritical CO 2 The working temperature of the temporary storage spherical tank (10) is not more than a design value of 350 ℃, the working pressure is not more than a design value of 12MPa, the manufacturing cost is reduced, and the fatigue resistance life of the pressure-bearing container is prolonged; the condensing water heater (5) is a large shell-and-tube surface heat exchanger, so that the compression heat generated by the compressor is effectively utilized in a mode of increasing the temperature of condensing water of the main machine, and meanwhile, the shaft power required by driving the compressor is reduced; supercritical CO 2 The separator (20) is a tangential air inlet centrifugal separator, is made of martensitic stainless steel or carbon steel stainless steel composite steel plate, has 12MPa of design bearing capacity and has 350 ℃; the liquid nitrogen liquid oxygen separator (9) is a tangential air inlet centrifugal separator, is made of martensitic stainless steel, has a design bearing capacity of 1.5MPa and a design temperature of-200 ℃; the liquid nitrogen liquid oxygen storage tank (26) is made of low-carbon martensitic stainless steel, the design bearing capacity is 1.5MPa, the design temperature is-200 ℃, the bearing layer is provided with a vacuum heat insulation outer shell layer, a polyurethane foam heat insulation layer and an aluminum outer guard plate outwards, and the top of the liquid nitrogen liquid oxygen storage tank is provided with an exhaust safety valve; the liquid nitrogen liquid oxygen storage tank (26) can be made into hundreds of thousands of meters 3 Even millions of m 3 The liquid nitrogen and liquid oxygen storage tank cluster realizes a large-scale long-period energy storage function; the liquid nitrogen liquid oxygen storage tank (26) can be made into a cylindrical tank body, and can also be made into a square underground or semi-underground tank body with a cover; the effective liquid storage depth is not more than 10m; the liquid nitrogen liquid oxygen booster pump (24) is an ultralow temperature high speed centrifugal pump, and can be used for pumping liquid nitrogen with the pressure of 1ataOxygen is boosted to 10MPa or more; the liquid nitrogen and liquid oxygen remote output pump (25) is an ultralow temperature high speed centrifugal pump, can boost the liquid nitrogen and liquid oxygen with the pressure of 1ata to 4MPa or higher, and supplies the liquid nitrogen and liquid oxygen to a remote user through an adiabatic liquid nitrogen and liquid oxygen remote output pipeline; the liquid nitrogen liquid oxygen gasification heater (23) is a giant thin-tube diameter shell-and-tube surface heat exchanger, liquid nitrogen liquid oxygen absorbs heat of circulating water from an indirect air cooling water tower, the temperature is increased from-196 ℃ to +50 ℃, the temperature of the circulating water from the indirect air cooling water tower is reduced by 5.1K, and the back pressure of a low-pressure cylinder of a host machine can be reduced by 7kPa; the nitrogen-oxygen superheater (21) is a giant medium-pipe diameter shell-and-tube surface heat exchanger, the nitrogen-oxygen mixture further absorbs condensation heat emitted by steam discharged by a medium-pressure cylinder, the temperature is further increased to 250 ℃ from +50 ℃, then the nitrogen-oxygen superheater enters the energy storage multistage turbine type gas expander (12) to do work, and the energy storage synchronous generator (13) converts the heat into electric energy, and the electric energy is sent into a power grid; the rotary smoke-purifying precooler (22) is a smoke-purifying precooler with a cold-transferring element, a 2-bin structure, a top and bottom flue, a rotor-bin partition plate and all the cold-transferring elements are made of stainless steel materials, and are sealed in a full-end-face contact mode, SO that a small amount of water vapor and SO carried in the smoke-purifying element 2 、SO 3 、NO x And other trace easy-to-condense gas condenses in the cold transfer element of the rotary smoke-purifying precooler, and is discharged from the liquid collecting tank at the bottom of the rotary smoke-purifying precooler, and trace dust in the smoke-purifying is carried and discharged; the carbon capturing multistage turbine type gas expander (16) consists of 1 expansion section, is directly connected with the carbon capturing synchronous generator (15), and outputs normal-pressure low-temperature nitrogen and oxygen while the output of the carbon capturing synchronous generator (15) is parallel to a power grid, is same in frequency and phase, and can convert the internal energy of high-pressure nitrogen plus oxygen into the electric energy required by the power grid efficiently; the normal pressure low temperature nitrogen and oxygen precool the clean flue gas of the coal-fired power plant boiler meeting the near zero emission standard of atmospheric pollutants through a rotary clean flue gas precooler (22); supercritical CO 2 The pressure bearing layer of the temporary storage spherical tank (18) is formed by welding pearlitic low alloy steel forgings with good weldability, and the inner layer is overlaid with martensitic stainless steel to prevent supercritical CO 2 The bearing layer is outwards provided with a vacuum heat insulation outer shell layer, an aluminum silicate cotton felt high temperature resistant heat preservation layer, a polyurethane foam heat preservation layer and an aluminum outer guard plate, and the working pressure is designedThe force is 12MPa, and the design working temperature is 350 ℃; supercritical CO 2 The inlet of the delivery pump (19) is connected with supercritical CO 2 Supercritical CO at the bottom of the separator (20) 2 Outlet, supercritical CO 2 The outlet of the delivery pump (19) is connected with supercritical CO 2 Supercritical CO of temporary storage spherical tank (18) 2 Inlet pipeline for always maintaining CO in the whole conveying process 2 Is in a supercritical state; supercritical CO 2 Supercritical CO of temporary storage spherical tank (18) 2 Outlet pipe and supercritical CO 2 The inlet of the output pump (17) is connected with supercritical CO 2 The outlet pressure of the output pump (17) is 12MPa and the supercritical CO 2 The output pipeline system is connected, the maximum conveying distance is 250km, a middle booster pump is not needed, and CO is always maintained in the whole output process 2 Is in a supercritical state; the carbon capturing medium frequency variable frequency power supply (1) is a giant power module serial high voltage variable frequency power supply, is input with 3-phase 6kV/10kV power frequency, outputs 3-phase 1Hz to 120Hz, and has 0.06kV/0.1kV-6kV/10kV and overload coefficient of 1.5; the energy-saving control device has two operation modes, namely a starting mode and an energy-saving mode; a start mode including a 0-speed start and a spin start having vector control characteristics; a power saving mode having a VVF characteristic; water cooling an IGBT power electronic device; the carbon capturing medium-frequency variable-frequency power supply (1) comprises a static excitation device required by a carbon capturing high-speed synchronous motor (2) and a static excitation device required by a carbon capturing synchronous generator (15); the main control board of the carbon capturing medium frequency conversion power supply (1) and the main control board of the static excitation device are communicated with each other, so that the carbon capturing high-speed synchronous motor (2) is ensured not to be out of step, and meanwhile, high efficiency and high power factors are maintained; ensuring that the outlet voltage and the power factor of the carbon capturing synchronous generator (15) are at target values; the carbon capturing medium frequency conversion power supply (1) is controlled by the measurement control subsystem when the carbon capturing working condition of the carbon capturing multistage turbine compressor (3) is driven, and the carbon capturing medium frequency conversion power supply (1) is used in the whole process; the whole process provides exciting current required by the carbon capturing synchronous generator (15), and the outlet voltage and the power factor of the carbon capturing synchronous generator (15) are stabilized at target values; forced ventilation, water air cooling and protection grade IP54 of the carbon capturing high-speed synchronous motor (2); the carbon capturing synchronous generator (15) is cooled in a hydro-hydro mode; a multistage turbine gas expander (16) is provided with a speed valve, an automatic main valve and a bypass throttle valve, an automatic quasi-synchronization device, and a high-usage device The capability of nitrogen and oxygen mixture pressing, flushing, speed increasing, warming up and synchronous grid connection; the deep-cooling medium-frequency variable-frequency power supply (4) is a giant power module serial high-voltage variable-frequency power supply, is input with 3-phase 6kV/10kV power frequency, outputs 3-phase 1Hz to 120Hz, and has 0.06kV/0.1kV-6kV/10kV and overload coefficient of 1.5; the energy-saving control device has two operation modes, namely a starting mode and an energy-saving mode; a start mode including a 0-speed start and a spin start having vector control characteristics; a power saving mode having a VVF characteristic; water cooling an IGBT power electronic device; the cryogenic intermediate frequency variable frequency power supply (4) comprises a static excitation device required by a cryogenic high-speed synchronous motor (5) and a static excitation device required by a cryogenic synchronous generator (8); the main control board of the cryogenic intermediate frequency variable frequency power supply (4) is communicated with the main control board of the static excitation device, so that the cryogenic high-speed synchronous motor (5) is ensured not to be out of step, and meanwhile, high efficiency and high power factors are maintained; ensuring that the outlet voltage and the power factor of the cryogenic synchronous generator (8) are at target values; when the cryogenic intermediate frequency variable frequency power supply (4) drives a cryogenic multistage turbine compressor (6) under the cryogenic working condition, the cryogenic intermediate frequency variable frequency power supply (4) is used in the whole process under the control of a measurement control subsystem; the cryogenic multistage turbine type gas expander (7) is provided with a speed regulating valve, an automatic main valve and a bypass throttle valve, and an automatic quasi-synchronization device has the capabilities of using a high-pressure nitrogen and oxygen mixture, flushing, accelerating, warming up and synchronization grid connection; forced ventilation, water cooling and protection grade IP54 of the cryogenic high-speed synchronous motor (5); the cryogenic synchronous generator (8) is cooled by a water hydrogen mode.
The invention has the beneficial effects that:
● The China has the strictest emission standard of the atmospheric pollutants of the coal-fired power plant worldwide, the coal-fired power generator set with the installed capacity of more than 11 hundred million kW is used for finishing near zero emission transformation of the atmospheric pollutants, and the finished transformation is pretreatment which is very required for smoke removal and smoke energy storage, so that the energy consumption of a smoke carbon capture and energy storage system is reduced, and the capital investment of smoke carbon capture and energy storage is also reduced;
● The invention relates to a deep-cooling carbon trapping system with near-0 carbon emission of a coal-fired unit with a large-scale long-period energy storage function, which belongs to carbon trapping after combustion, is easy to realize large-scale and modularized, is suitable for a newly built high-efficiency coal-fired unit and is also suitable for all active coal-fired units which have completed near-zero emission reconstruction of atmospheric pollutants, and one deep-cooling carbon trapping system with near-0 carbon emission of the coal-fired unit with the large-scale long-period energy storage function can be used for time-sharing service of a plurality of coal-fired units through connection and switching of a flue under the aspect of promoting the flexibility of the coal-fired unit in a quick, energy-saving and water-saving start-stop mode;
● Compared with a coal-fired unit, the tail gas of the single-cycle gas turbine and the exhaust gas of the exhaust-heat boiler of the composite cycle gas turbine have the common characteristics that the partial pressure of water vapor is high, the temperature is also higher, a condensation heating surface (for example, tap water is heated and domestic hot water is supplied to communities) is arranged at the tail part of the single-cycle gas turbine and the exhaust gas part of the exhaust-heat boiler of the composite cycle gas turbine, the condensation heat of water in the flue gas is recovered, and after the temperature of the flue gas is reduced, the near-0 carbon emission modification can be introduced;
● The coal-fired generator set successfully completes the near zero emission reconstruction prompt of atmospheric pollutants, and the CO-containing gas in the cement industry, the chemical industry and the steel industry 2 The higher tail gas can also be used as the pretreatment of the CCUS through the near zero emission reformation of waste heat utilization and atmospheric pollutants; the near-0 carbon emission cryogenic carbon trapping system of the coal-fired unit with the large-scale long-period energy storage function can be transplanted to cement, chemical industry and steel industry, so that 0 carbonization is produced in cement production, ash hydrogen is converted into green hydrogen, and hydrogen+CO is further developed 2 A process for large-scale production of methanol;
● The carbon capturing multistage turbine type gas compressor consists of A, B, C and 3 compression sections which are coaxial; the A compression section is of a double-flow channel structure, the 1 st stage and the 2 nd stage blades are made of aviation forged aluminum, the B compression section and the C compression section are uniflow, and the martensitic stainless steel blades are made of martensitic stainless steel; the carbon capturing medium-frequency variable-frequency power supply is directly connected with the carbon capturing high-speed synchronous motor to drive the carbon capturing multistage turbine type gas compressor, the starting process from 0 rotating speed is soft and stable, and the maximum starting current does not exceed the rated current; the whole process is regulated by changing the rotation speed and the compression ratio, and supercritical CO can be carried out under the condition of different smoke loads 2 The pressure in the separator is stable and the separator runs economically under 8.5 MPa; becomes a controllable load with huge volume and becomes a new VPP improvement Important means for the type power system to meet the flexibility requirements of time characteristics of different scales such as short, medium and long; the maximum shaft power of the carbon capturing multistage turbine type gas compressor with the same geometric through-flow is 8 times that of the carbon capturing multistage turbine type gas compressor driven by a high-speed synchronous motor, and the maximum shaft power is still further improved along with the further improvement of the high-frequency performance of a power electronic device IGBT;
● The popularization and application of the deep-cooling carbon trapping system with the large-scale long-period energy storage function and near 0 carbon emission of the coal-fired unit can obviously improve the ecology of the coal-fired unit, obviously improve the annual utilization hours of the coal-fired unit, reduce the annual average power generation coal consumption, recover the profitability of the coal-fired unit, better exert the pressure-bin stone bottom-keeping function of high-efficiency coal and electricity, and have the basic economical condition of market competition with new energy and energy storage;
● The refrigerating energy efficiency of the multistage turbine type gas expander is obviously higher than that of the throttling expansion regulating valve, and the multistage turbine type gas expander can also output considerable shaft power and can be reversely transmitted back to a power grid through the synchronous generator;
● The condensing water heater group formed by connecting A, B, C and 3 groups of surface heat exchangers in series is respectively connected with A, B, C of the carbon capturing multistage turbine type gas compressor and outlets of 3 compression sections, and the purified flue gas after being cooled by condensing water enters an inlet of the next compression section or supercritical CO 2 The inlet of the separator is particularly suitable for the absorption of the compression heat of full continuous carbon capture required by the coal-fired unit for realizing nearly 0 carbon emission, is not limited by the limited heat capacity of a heat storage and reheating subsystem, and is an important technical measure for realizing the absorption of the compression heat of full continuous carbon capture;
● The condensing water heater group consisting of D, E and 2 groups of surface heat exchangers in series is respectively connected with D, E of the cryogenic multistage turbine type gas compressor and outlets of 2 compression sections, and the high-pressure nitrogen-oxygen mixture after being cooled by condensing water enters the cryogenic multistage turbine type gas expander to expand and do work, and is fed back to a power grid through the cryogenic synchronous generator;
● Rotary clean flue gas precooler in the invention, nitrogen with low boiling pointThe air and the oxygen become carriers of cold energy in the refrigeration technology, the low-temperature refrigeration result of each kJ is difficult, the refrigeration technology is the recycling of the low-temperature refrigeration result, and the CO is made 2 The energy consumption in the trapping process is reduced by 6 times;
● The back cooling efficiency (considering the volume leakage, the dynamic sealing surface leakage and the cold leakage caused by the non-ideal heat insulation) of the rotary type clean flue gas precooler can reach 99 percent, and the rotary type clean flue gas precooler has the advantages of low metal consumption, small volume and small maintenance, and the rotary type clean flue gas precooler is used for recycling cold energy, but the mass flow of the carbon capturing multistage turbine type gas compressor is not increased;
● The deep-cooling carbon trapping system with the large-scale long-period energy storage function and near 0 carbon emission of the coal-fired unit achieves the conversion from full high-carbon electricity (including about 10% of carbon trapping electricity) to 0 carbon electricity by about 10% of carbon trapping electricity, and has strong economical efficiency compared with 'new energy and energy storage completely replacing fossil energy'; the high-efficiency coal power, low-energy consumption CCUS and new energy and energy storage coexist mutually, and the two legs walk to be more in line with the energy endowment of more coal, oil deficiency and less gas in China in the competition of full marketization; the method has the key and substantial significance for realizing carbon reaching peaks and carbon neutralization targets in early days in China by taking a carbon neutralization technical path which is different from European, american and abandoned coal as a core;
● The cryogenic carbon trapping system with the large-scale long-period energy storage function and near 0 carbon emission of the coal-fired unit uses another cryogenic electricity utilization rate of about 10%, realizes the large-scale long-period energy storage function by taking normal-pressure liquid nitrogen and liquid oxygen as energy storage working media, can remarkably improve the ecology of the coal-fired unit, remarkably improve the annual utilization hours of the coal-fired unit, reduce annual average power generation coal consumption, recover the profitability of the coal-fired unit, better exert the pressure bin stone bottom protection function of high-efficiency coal electricity, be a new mode for improving the coal electricity flexibility, and can realize the remote utilization of energy storage; because the huge amount of cold end waste heat and condensation heat of medium pressure cylinder exhaust steam are introduced before the energy storage multistage turbine type gas expander is introduced, the electric energy fed back by the energy storage synchronous generator to the power grid and the main machine shaft power increase value caused by the reduction of the circulating water temperature of the indirect air cooling water tower are more likely to exceed the electric energy consumed by producing the liquid nitrogen and the liquid oxygen, namely the apparent energy storage efficiency is more than 100 percent;
●CO 2 It is impossible to store and transport in liquid form at normal pressure (1 ata) low temperature; at normal pressure (1 ata) and low temperature (-78.5 ℃), the liquid state is not passed, and the gas state is directly converted into the solid state, and vice versa; supercritical CO 2 At a temperature higher than 31.1 ℃ and a pressure lower than 7.38MPa, the supercritical state is directly changed into the gaseous state without passing through the liquid state, and vice versa; long distance, high mass flow CO 2 Pipeline transportation, and the most convenient form is supercritical CO 2 The method comprises the steps of carrying out a first treatment on the surface of the Supercritical CO of the invention 2 The outlet pressure of the output pump reaches 12MPa or higher, and the output pump passes through supercritical CO 2 The pipeline conveying system does not need a midway booster pump, the maximum conveying distance reaches 2501m, and the pipeline conveying system can directly perfuse matched geologic bodies, so that the supercritical CO is obviously reduced 2 The cost of transportation, utilization and sealing;
● BECCS (biomass energy capturing and sealing) combined with biomass energy (such as large-scale cultivation and mixed burning of Arundo donax) is a genuine carbon negative technology, and can largely reduce CO remained in the atmosphere due to historical reasons 2 Is a new energy source and can not store energy.
(IV) description of the drawings:
FIG. 1 is a system diagram of a near-0 carbon emission cryogenic carbon capture system of a coal-fired unit with large-scale long-period energy storage function
In fig. 1:
1 carbon capturing medium frequency conversion power supply, 2 carbon capturing high speed synchronous motor,
3 carbon capture multistage turbine type gas compressor, 4 deep cooling medium frequency variable frequency power supply,
5 cryogenic high-speed synchronous motor, 6 cryogenic multi-stage turbine type gas compressor,
7 deep cooling multistage turbine type gas expander, 8 deep cooling synchronous generator,
9 liquid nitrogen liquid oxygen separator, 10 condensed water heater,
11 deep cooling multistage turbine type gas compressor inlet shutoff valve, 12 energy storage multistage turbine type gas expander,
13 energy storage synchronous generator, 14 liquid nitrogen liquid oxygen delivery pump,
15 carbon capturing synchronous generator, 16 carbon capturing multistage turbine type gas expander,
17 supercritical CO 2 Output pump, 18 supercritical CO 2 A temporary storage ball tank,
19 supercritical CO 2 Delivery pump, 20 supercritical CO 2 A separator,
21 nitrogen-oxygen superheater, 22 rotary smoke-purifying precooler,
23 liquid nitrogen liquid oxygen gasification heater, 24 liquid nitrogen liquid oxygen booster pump,
25 liquid nitrogen liquid oxygen long-distance output pump, 26 liquid nitrogen liquid oxygen storage tank,
27 liquid nitrogen liquid oxygen separator outlet block valve, 28 liquid nitrogen liquid oxygen separator inlet block valve.
(V) the specific embodiment:
example 1:
referring now to fig. 1, a 1000MW ultra supercritical once reheating indirect air-cooled coal-fired unit is taken as an example to realize a near-0 carbon emission cryogenic carbon capture system with a large-scale long-period energy storage function, and a preferred mode for realizing the invention is described.
The invention discloses a cryogenic carbon trapping system with near 0 carbon emission of a coal-fired unit with a large-scale long-period energy storage function, which abandons an alcohol amine absorption method and a physical adsorption method and adopts a completely different technical route from the prior art; at normal temperature (20-50 ℃ desulfurizing tower outlet or wet electric dust removing outlet), the clean flue gas of the coal-fired power station boiler meeting the near zero emission standard of atmospheric pollutants is compressed in a heat-insulating way by using a carbon capturing multistage turbine compressor, and is pumped into supercritical CO after absorbing heat and reducing temperature by a group A, a group B and a group C condensing water heater 2 Separator, in supercritical CO 2 After a pressure of over 7.38MPa in the separator (due to gas pressureThe thermal effect temperature in the condensation process must exceed 31.1 ℃ and the CO in the smoke exhaust is discharged 2 The gas is converted into supercritical fluid, the gravity of the supercritical fluid is two orders of magnitude greater than that of the gas, and the supercritical CO 2 Separated from nitrogen and oxygen in the exhausted smoke and accumulated in supercritical CO 2 A lower portion of the separator; in the exhaust gas of the utility boiler, the main components are nitrogen (about 79 percent) and CO 2 About 14% oxygen (about 6%) and the mass of nitrogen plus oxygen in the flue gas is about CO 2 6 times of the mass, and CO in the whole smoke discharged from the power station boiler is captured by using a smoke discharge compression supercritical phase change method 2 About 30% of the generator output power is consumed, becoming an unacceptably high energy process; in order to effectively reduce the energy consumption of a carbon capture system of a smoke discharge compression supercritical phase transformation method, the invention discovers that useless high-enthalpy nitrogen plus oxygen is expanded to 1ata through a multistage turbine type gas expander in an adiabatic manner to become low-temperature nitrogen plus oxygen, and the low-temperature nitrogen plus oxygen is enough to precool the clean flue gas of a coal-fired power plant boiler which is inhaled from a flue and accords with the near-zero emission standard of atmospheric pollutants through a rotary clean flue gas precooler, and meanwhile, a small amount of water vapor and SO carried in the clean flue gas 2 、SO 3 、NO x And other trace easy-to-condense gas condenses in the cold transfer element of the rotary smoke-purifying precooler, and is discharged from the liquid collecting tank at the bottom of the rotary smoke-purifying precooler, and trace dust in the smoke-purifying is carried and discharged; the volume flow of the purified flue gas after precooling is obviously reduced, the weight is increased, and the shaft power required by the carbon capturing multistage turbine type gas compressor is obviously reduced; the efficiency of the modern high-speed adjustable multi-stage turbine type compressor in a wide working condition range can be 85%, the efficiency of the modern constant-speed multi-stage turbine type gas expander can be 90%, and the electric energy returned by the constant-speed multi-stage turbine type gas expander is reduced by the special rotary type smoke precooler cooling technology, and the electric quantity generated by a main engine is increased by the effective utilization of compression heat by a condensation water heater, so that the actual power consumption of the high-speed adjustable multi-stage turbine type compressor is reduced to 10% or lower of the output power of a generator; 1000MW single-reheat ultra-supercritical indirect air-cooled generator set, annual utilization hour 7000 hours frame calculation and annual generation 70 hundred million kWh of electric quantity is used for capturing 7 hundred million kWh of net electricity consumption of carbon and 350 ten thousand tons of CO per year 2 200kWh/t CO 2 For example, the electricity price is calculated as 0.5 yuan/kWh, and is 100 yuan/t CO 2 I.e. the CO has reached the establishment of the Chinese engineering institute 2 Capturing expected values of 2045 years of a technical development map; if the cost of the power generation of the power plant is 0.3 yuan/kWh, the cost is 60 yuan/t CO 2 About 60 yuan per t CO with average price of 2021 Carbon Emission Allowance (CEA) 2 The method is even, and the high-efficiency coal power and the CCUS have basic conditions of market competition with new energy and energy storage in the same field; the full carbon capture electricity consumption of 10% is compared with the pumping energy storage efficiency of 75%, the novel compressed air energy storage efficiency of 70% and the electrochemical energy storage efficiency of 70, and the economy is not necessarily under the wind; or becomes a technical solution for breaking the reality of the safety, environmental protection and economy impossible triangle of the new energy system; in supercritical CO 2 The separator separates all supercritical CO 2 Under the quasi-steady state condition that nitrogen and oxygen with high enthalpy are returned to the imported clean flue gas by the carbon capturing multi-stage turbine type gas expander and the rotary clean flue gas precooler, the inlet shutoff valve of the cryogenic multi-stage turbine type gas compressor is gradually opened, the nitrogen and the oxygen with high enthalpy can be shunted into the cryogenic multi-stage turbine type gas compressor, the rotating speed of the cryogenic multi-stage turbine type gas compressor is controlled by the cryogenic intermediate frequency variable frequency power supply and the cryogenic high-speed synchronous motor, the pressure 1ata in the liquid nitrogen liquid oxygen separator can be maintained, the temperature is minus 196 ℃, and all inert gases such as oxygen, nitrogen and argon are liquefied and stored in the liquid nitrogen liquid oxygen storage tank; the liquid nitrogen liquid oxygen storage tank can be made into hundreds of thousands of meters 3 Even millions of m 3 The liquid nitrogen and liquid oxygen storage tank cluster realizes a large-scale long-period energy storage function; liquid nitrogen-liquid oxygen mixture at normal pressure per m 3 About 201kWh and one million m of cold energy 3 Stored energy up to 201X 10 6 kWh, namely the generated energy generated by millions of units running for 201 hours at full load, the pumped storage power station with the maximum installed capacity does not necessarily have a large-scale long-period energy storage function; the liquid nitrogen and liquid oxygen can be boosted in situ by a liquid nitrogen and liquid oxygen booster pump, gasified by a liquid nitrogen and liquid oxygen gasification heater, overheated by a nitrogen and oxygen superheater and expanded by an energy storage multistage turbine type gasThe expander and the energy storage synchronous generator output the stored electric energy, which is characterized in that a Rankine cycle taking nitrogen and oxygen elements as working media is sleeved on the original Rankine cycle taking water as working media, and the thermal efficiency of the composite cycle is obviously higher than that of the original Rankine cycle taking water as working media; the liquid nitrogen liquid oxygen gasification heater also substantially reduces the back pressure of the Rankine cycle which takes water as a working medium, and obviously improves the thermal efficiency of the Rankine cycle which takes water as the working medium; the liquid nitrogen and the liquid oxygen can be output to a remote place through a liquid nitrogen and liquid oxygen remote output pump and a heat insulation pipeline, so that the liquid nitrogen and the liquid oxygen can be used for a remote large-scale concentrated cold source for cooling, the thermal efficiency and the operation flexibility of a remote generator set are improved, and the peak of electricity consumption in summer can be obviously solved; if the investment is willing to increase, the diversity and separate storage of liquid oxygen, liquid argon and liquid nitrogen are realized, the technology is completely free from problems, a 1000MW ultra-supercritical once-through reheat coal-fired unit with nearly 0 carbon emission is realized, the annual utilization is calculated according to 7000 hours, 50% of nitrogen elements in smoke is liquefied, and the yield of liquid nitrogen is 980 multiplied by 10 4 t,2 ultra-supercritical once-through coal-fired units with the emission of nearly 0 carbon of 1000MW are enough to support the construction of a liquid nitrogen conveying pipeline leading to Europe; the ultra-high voltage superconducting cable leading to Europe can be built by depending on the liquid nitrogen conveying pipeline, and the line loss is only 1/10 of that of the ultra-high voltage overhead line; the superconducting maglev train leading to Europe can be constructed by depending on the liquid nitrogen conveying pipeline; the superconducting energy storage device can be built by depending on the liquid nitrogen conveying pipeline, energy is converted into electromagnetic energy by utilizing a superconducting coil for storage, and energy exchange is controlled by a power converter, so that the device is suitable for high-power and high-dynamic response energy storage occasions; the refined liquid oxygen can be used for medical use, can also be used as a propellant of a giant rocket, and unrefined liquid oxygen can be used for oxygen-enriched combustion; the refined argon can be used as a protective agent for the high-end welding process in the production of semiconductor chips;
the invention relates to a near-0 carbon emission cryogenic carbon capture system of a coal-fired unit with a large-scale long-period energy storage function, which is technically characterized by comprising a carbon capture intermediate frequency variable frequency power supply (1), a carbon capture high-speed synchronous motor (2), a carbon capture multi-stage turbine type gas compressor (3), a cryogenic intermediate frequency variable frequency power supply (4), a cryogenic high-speed synchronous motor (5) and a cryogenic multi-stage turbine type gas compression system The device comprises a machine (6), a cryogenic multistage turbine type gas expander (7), a cryogenic synchronous generator (8), a liquid nitrogen liquid oxygen separator (9), a condensation water heater (10), a cryogenic multistage turbine type gas compressor inlet shutoff valve (11), an energy storage multistage turbine type gas expander (12), an energy storage synchronous generator (13), a liquid nitrogen liquid oxygen delivery pump (14), a carbon capturing synchronous generator (15), a carbon capturing multistage turbine type gas expander (16) and supercritical CO (carbon monoxide) 2 Output pump (17), supercritical CO 2 Temporary storage spherical tank (18) and supercritical CO 2 Delivery pump (19), supercritical CO 2 The device comprises a separator (20), a nitrogen-oxygen superheater (21), a rotary flue gas purifying precooler (22), a liquid nitrogen-liquid oxygen gasification heater (23), a liquid nitrogen-liquid oxygen booster pump (24), a liquid nitrogen-liquid oxygen remote output pump (25), a liquid nitrogen-liquid oxygen storage tank (26), a liquid nitrogen-liquid oxygen separator outlet block valve (27), a liquid nitrogen-liquid oxygen separator inlet block valve (28) and a measurement control subsystem;
the carbon capturing multistage turbine type gas compressor (3) consists of a coaxial A, B, C compression section and 3 compression sections; the compression section A is of a double-flow channel structure, the 1 st stage and the 2 nd stage long blades are made of aviation forged aluminum, and the compression section B and the compression section C are single-flow martensitic stainless steel blades; the carbon capturing intermediate frequency variable frequency power supply (1) is directly connected with the carbon capturing multistage turbine type gas compressor (3) through the carbon capturing high-speed synchronous motor (2); the carbon capturing multistage turbine type gas compressor (3) and the measurement control subsystem cooperate to ensure the safety and high efficiency of the carbon capturing multistage turbine type gas compressor set under the supercritical pressure working conditions including but not limited to a starting working condition, a supercritical pressure boosting working condition of 0.1MPa to 8.5MPa and the supercritical pressure working condition of 8.5MPa under different smoke load; the whole process is regulated by changing the rotating speed and the compression ratio so as to adapt to different smoke load and supercritical CO 2 The instant pressure of the separator and the reasonable boosting speed; the outlets of the A, B, C compression sections and the 3 compression sections are respectively connected with a condensation water heater (5), which not only can obviously reduce the driving shaft power required by the carbon capture multistage turbine compressor (3), but also can control the supercritical CO 2 Separator (4), supercritical CO 2 The working temperature of the temporary storage spherical tank (10) is not more than a design value of 350 ℃, the working pressure is not more than a design value of 12MPa, the manufacturing cost is reduced, and the fatigue resistance life of the pressure-bearing container is prolonged;
the condensing water heater (5) is a large shell-and-tube surface heat exchanger, so that the compression heat generated by the compressor is effectively utilized in a mode of increasing the temperature of condensing water of the main machine, and meanwhile, the shaft power required by driving the compressor is reduced;
supercritical CO 2 The separator (20) is a tangential air inlet centrifugal separator, is made of martensitic stainless steel or carbon steel stainless steel composite steel plate, has 12MPa of design bearing capacity and has 350 ℃;
the liquid nitrogen liquid oxygen separator (9) is a tangential air inlet centrifugal separator, is made of martensitic stainless steel, has a design bearing capacity of 1.5MPa and a design temperature of-200 ℃;
the liquid nitrogen liquid oxygen storage tank (26) is made of low-carbon martensitic stainless steel, the design bearing capacity is 1.5MPa, the design temperature is-200 ℃, the bearing layer is provided with a vacuum heat insulation outer shell layer, a polyurethane foam heat insulation layer and an aluminum outer guard plate outwards, and the top of the liquid nitrogen liquid oxygen storage tank is provided with an exhaust safety valve; the liquid nitrogen liquid oxygen storage tank (26) can be made into hundreds of thousands of meters 3 Even millions of m 3 The liquid nitrogen and liquid oxygen storage tank cluster realizes a large-scale long-period energy storage function; the liquid nitrogen liquid oxygen storage tank (26) can be made into a cylindrical tank body, and can also be made into a square underground or semi-underground tank body with a cover; the effective liquid storage depth is not more than 10m;
the liquid nitrogen liquid oxygen booster pump (24) is an ultralow temperature high speed centrifugal pump, and can boost the liquid nitrogen liquid oxygen with the pressure of 1ata to 10MPa or higher;
the liquid nitrogen and liquid oxygen remote output pump (25) is an ultralow temperature high speed centrifugal pump, can boost the liquid nitrogen and liquid oxygen with the pressure of 1ata to 4MPa or higher, and supplies the liquid nitrogen and liquid oxygen to a remote user through an adiabatic liquid nitrogen and liquid oxygen remote output pipeline;
the liquid nitrogen liquid oxygen gasification heater (23) is a giant thin-tube diameter shell-and-tube surface heat exchanger, liquid nitrogen liquid oxygen absorbs heat of circulating water from an indirect air cooling water tower, the temperature is increased from-196 ℃ to +50 ℃, the temperature of the circulating water from the indirect air cooling water tower is reduced by 5.1K, and the back pressure of a low-pressure cylinder of a host machine can be reduced by 7kPa;
the nitrogen-oxygen superheater (21) is a giant medium-pipe diameter shell-and-tube surface heat exchanger, the nitrogen-oxygen mixture further absorbs condensation heat emitted by steam discharged by a medium-pressure cylinder, the temperature is further increased to 250 ℃ from +50 ℃, then the nitrogen-oxygen superheater enters the energy storage multistage turbine type gas expander (12) to do work, and the energy storage synchronous generator (13) converts the heat into electric energy, and the electric energy is sent into a power grid;
The rotary smoke-purifying precooler (22) is a smoke-purifying precooler with a cold-transferring element, a 2-bin structure, a top and bottom flue, a rotor-bin partition plate and all the cold-transferring elements are made of stainless steel materials, and are sealed in a full-end-face contact mode, SO that a small amount of water vapor and SO carried in the smoke-purifying element 2 、SO 3 、NO x And other trace easy-to-condense gas condenses in the cold transfer element of the rotary smoke-purifying precooler, and is discharged from the liquid collecting tank at the bottom of the rotary smoke-purifying precooler, and trace dust in the smoke-purifying is carried and discharged;
the carbon capturing multistage turbine type gas expander (16) consists of 1 expansion section, is directly connected with a carbon capturing synchronous generator (15), and outputs the synchronous generator (15) in parallel with a power grid, the same frequency and the same phase, so that the internal energy of high-pressure nitrogen plus oxygen is efficiently converted back to the electric energy required by the power grid, and simultaneously, the normal-pressure low-temperature nitrogen and oxygen are output; the normal pressure low temperature nitrogen and oxygen precool the clean flue gas of the coal-fired power plant boiler meeting the near zero emission standard of atmospheric pollutants through a rotary clean flue gas precooler (22);
supercritical CO 2 The pressure bearing layer of the temporary storage spherical tank (18) is formed by welding pearlitic low alloy steel forgings with good weldability, and the inner layer is overlaid with martensitic stainless steel to prevent supercritical CO 2 The pressure bearing layer is outwards provided with a vacuum heat insulation outer shell layer, an aluminum silicate cotton felt high temperature resistant heat preservation layer, a polyurethane foam heat preservation layer and an aluminum outer guard plate, the design working pressure is 12MPa, and the design working temperature is 350 ℃;
Supercritical CO 2 The inlet of the delivery pump (19) is connected with supercritical CO 2 Supercritical CO at the bottom of the separator (20) 2 Outlet, supercritical CO 2 The outlet of the delivery pump (19) is connected with supercritical CO 2 Supercritical CO of temporary storage spherical tank (18) 2 Inlet pipeline for always maintaining CO in the whole conveying process 2 Is in a supercritical state; supercritical CO 2 Supercritical CO of temporary storage spherical tank (18) 2 Outlet pipe and supercritical CO 2 The inlet of the output pump (17) is connected with supercritical CO 2 The outlet pressure of the output pump (17) is 12MPa and the supercritical CO 2 The output pipeline system is connected, the maximum conveying distance is 250km, a middle booster pump is not needed, and CO is always maintained in the whole output process 2 Is in a supercritical state;
the carbon capturing medium frequency variable frequency power supply (1) is a giant power module serial high voltage variable frequency power supply, is input with 3-phase 6kV/10kV power frequency, outputs 3-phase 1Hz to 120Hz, and has 0.06kV/0.1kV-6kV/10kV and overload coefficient of 1.5; the energy-saving control device has two operation modes, namely a starting mode and an energy-saving mode; a start mode including a 0-speed start and a spin start having vector control characteristics; a power saving mode having a VVF characteristic; water cooling an IGBT power electronic device; the carbon capturing medium-frequency variable-frequency power supply (1) comprises a static excitation device required by a carbon capturing high-speed synchronous motor (2) and a static excitation device required by a carbon capturing synchronous generator (15); the main control board of the carbon capturing medium frequency conversion power supply (1) and the main control board of the static excitation device are communicated with each other, so that the carbon capturing high-speed synchronous motor (2) is ensured not to be out of step, and meanwhile, high efficiency and high power factors are maintained; ensuring that the outlet voltage and the power factor of the carbon capturing synchronous generator (15) are at target values; the carbon capturing medium frequency conversion power supply (1) is controlled by the measurement control subsystem when the carbon capturing working condition of the carbon capturing multistage turbine compressor (3) is driven, and the carbon capturing medium frequency conversion power supply (1) is used in the whole process; the whole process provides exciting current required by the carbon capturing synchronous generator (15), and the outlet voltage and the power factor of the carbon capturing synchronous generator (15) are stabilized at target values; forced ventilation, water air cooling and protection grade IP54 of the carbon capturing high-speed synchronous motor (2); the carbon capturing synchronous generator (15) is cooled in a hydro-hydro mode; the multistage turbine type gas expander (16) is provided with a speed regulating valve, an automatic main valve and a bypass throttle valve, and an automatic quasi-synchronization device has the capabilities of using a high-pressure nitrogen and oxygen mixture, flushing, accelerating, warming up and synchronization grid connection;
The deep-cooling medium-frequency variable-frequency power supply (4) is a giant power module serial high-voltage variable-frequency power supply, is input with 3-phase 6kV/10kV power frequency, outputs 3-phase 1Hz to 120Hz, and has 0.06kV/0.1kV-6kV/10kV and overload coefficient of 1.5; the energy-saving control device has two operation modes, namely a starting mode and an energy-saving mode; a start mode including a 0-speed start and a spin start having vector control characteristics; a power saving mode having a VVF characteristic; water cooling an IGBT power electronic device; the cryogenic intermediate frequency variable frequency power supply (4) comprises a static excitation device required by a cryogenic high-speed synchronous motor (5) and a static excitation device required by a cryogenic synchronous generator (8); the main control board of the cryogenic intermediate frequency variable frequency power supply (4) is communicated with the main control board of the static excitation device, so that the cryogenic high-speed synchronous motor (5) is ensured not to be out of step, and meanwhile, high efficiency and high power factors are maintained; ensuring that the outlet voltage and the power factor of the cryogenic synchronous generator (8) are at target values; when the cryogenic intermediate frequency variable frequency power supply (4) drives a cryogenic multistage turbine compressor (6) under the cryogenic working condition, the cryogenic intermediate frequency variable frequency power supply (4) is used in the whole process under the control of a measurement control subsystem; the cryogenic multistage turbine type gas expander (7) is provided with a speed regulating valve, an automatic main valve and a bypass throttle valve, and an automatic quasi-synchronization device has the capabilities of using a high-pressure nitrogen and oxygen mixture, flushing, accelerating, warming up and synchronization grid connection; forced ventilation, water cooling and protection grade IP54 of the cryogenic high-speed synchronous motor (5); the cryogenic synchronous generator (8) is cooled by a water hydrogen mode.
Claims (1)
1. A cryogenic carbon capture system with large-scale long-period energy storage function and near 0 carbon emission for coal-fired units is characterized in that: the device comprises a carbon capturing intermediate frequency variable frequency power supply (1), a carbon capturing high-speed synchronous motor (2), a carbon capturing multistage turbine type gas compressor (3), a cryogenic intermediate frequency variable frequency power supply (4), a cryogenic high-speed synchronous motor (5), a cryogenic multistage turbine type gas compressor (6), a cryogenic multistage turbine type gas expander (7), a cryogenic synchronous generator (8), a liquid nitrogen liquid oxygen separator (9), a condensation water heater (10), a cryogenic multistage turbine type gas compressor inlet shutoff valve (11), an energy storage multistage turbine type gas expander (12), an energy storage synchronous generator (13), a liquid nitrogen liquid oxygen delivery pump (14), a carbon capturing synchronous generator (15), a carbon capturing multistage turbine type gas expander (16) and supercritical CO 2 Output pump (17), supercritical CO 2 Temporary storage spherical tank (18) and supercritical CO 2 Delivery pump (19), supercritical CO 2 The device comprises a separator (20), a nitrogen-oxygen superheater (21), a rotary smoke purifying precooler (22), a liquid nitrogen liquid oxygen gasification heater (23), a liquid nitrogen liquid oxygen booster pump (24), a liquid nitrogen liquid oxygen remote output pump (25), a liquid nitrogen liquid oxygen storage tank (26) and a liquid nitrogen liquid oxygen componentA separator outlet block valve (27), a liquid nitrogen liquid oxygen separator inlet block valve (28) and a measurement control subsystem; the carbon capturing multistage turbine type gas compressor (3) consists of a coaxial A, B, C compression section and 3 compression sections; the compression section A is of a double-flow channel structure, the 1 st stage and the 2 nd stage long blades are made of aviation forged aluminum, and the compression section B and the compression section C are uniflow, and are martensitic stainless steel blades; the carbon capturing intermediate frequency variable frequency power supply (1) is directly connected with the carbon capturing multistage turbine type gas compressor (3) through the carbon capturing high-speed synchronous motor (2); the carbon capturing multistage turbine type gas compressor (3) and the measurement control subsystem cooperate to ensure the safety and high efficiency of the carbon capturing multistage turbine type gas compressor set under the supercritical pressure working conditions including but not limited to a starting working condition, a supercritical pressure boosting working condition of 0.1MPa to 8.5MPa and the supercritical pressure working condition of 8.5MPa under different smoke load; the whole process is regulated by changing the rotating speed and the compression ratio so as to adapt to different smoke load and supercritical CO 2 The instant pressure of the separator and the reasonable boosting speed; the outlets of the A, B, C compression sections and the 3 compression sections are respectively connected with a condensation water heater (5), which not only can obviously reduce the driving shaft power required by the carbon capture multistage turbine compressor (3), but also can control the supercritical CO 2 Separator (4), supercritical CO 2 The working temperature of the temporary storage spherical tank (10) is not more than a design value of 350 ℃, the working pressure is not more than a design value of 12MPa, the manufacturing cost is reduced, and the fatigue resistance life of the pressure-bearing container is prolonged; the condensing water heater (5) is a large shell-and-tube surface heat exchanger, so that the compression heat generated by the compressor is effectively utilized in a mode of increasing the temperature of condensing water of the main machine, and meanwhile, the shaft power required by driving the compressor is reduced; supercritical CO 2 The separator (20) is a tangential air inlet centrifugal separator, is made of martensitic stainless steel or carbon steel stainless steel composite steel plate, has 12MPa of design bearing capacity and has 350 ℃; the liquid nitrogen liquid oxygen separator (9) is a tangential air inlet centrifugal separator, is made of martensitic stainless steel, has a design bearing capacity of 1.5MPa and a design temperature of-200 ℃; the liquid nitrogen liquid oxygen storage tank (26) is made of low-carbon martensitic stainless steel, the design bearing capacity is 1.5MPa, the design temperature is-200 ℃, the bearing layer is provided with a vacuum heat insulation outer shell layer, a polyurethane foam heat insulation layer and an aluminum outer guard plate outwards, and the top of the liquid nitrogen liquid oxygen storage tank is provided with an exhaust safety valve; the liquid nitrogen liquid oxygen storage tank (26) can be made In hundreds of thousands m 3 Even millions of m 3 The liquid nitrogen and liquid oxygen storage tank cluster realizes a large-scale long-period energy storage function; the liquid nitrogen liquid oxygen storage tank (26) can be made into a cylindrical tank body, and can also be made into a square underground or semi-underground tank body with a cover; the effective liquid storage depth is not more than 10m; the liquid nitrogen liquid oxygen booster pump (24) is an ultralow temperature high speed centrifugal pump, and can boost the liquid nitrogen liquid oxygen with the pressure of 1ata to 10MPa or higher; the liquid nitrogen and liquid oxygen remote output pump (25) is an ultralow temperature high speed centrifugal pump, can boost the liquid nitrogen and liquid oxygen with the pressure of 1ata to 4MPa or higher, and supplies the liquid nitrogen and liquid oxygen to a remote user through an adiabatic liquid nitrogen and liquid oxygen remote output pipeline; the liquid nitrogen liquid oxygen gasification heater (23) is a giant thin-tube diameter shell-and-tube surface heat exchanger, liquid nitrogen liquid oxygen absorbs heat of circulating water from an indirect air cooling water tower, the temperature is increased from-196 ℃ to +50 ℃, the temperature of the circulating water from the indirect air cooling water tower is reduced by 5.1K, and the back pressure of a low-pressure cylinder of a host machine can be reduced by 7kPa; the nitrogen-oxygen superheater (21) is a giant medium-pipe diameter shell-and-tube surface heat exchanger, the nitrogen-oxygen mixture further absorbs condensation heat emitted by steam discharged by a medium-pressure cylinder, the temperature is further increased to 250 ℃ from +50 ℃, then the nitrogen-oxygen superheater enters the energy storage multistage turbine type gas expander (12) to do work, and the energy storage synchronous generator (13) converts the heat into electric energy, and the electric energy is sent into a power grid; the rotary smoke-purifying precooler (22) is a smoke-purifying precooler with a cold-transferring element, a 2-bin structure, a top and bottom flue, a rotor-bin partition plate and all the cold-transferring elements are made of stainless steel materials, and are sealed in a full-end-face contact mode, SO that a small amount of water vapor and SO carried in the smoke-purifying element 2 、SO 3 、NO x And other trace easy-to-condense gas condenses in the cold transfer element of the rotary smoke-purifying precooler, and is discharged from the liquid collecting tank at the bottom of the rotary smoke-purifying precooler, and trace dust in the smoke-purifying is carried and discharged; the carbon capturing multistage turbine type gas expander (16) consists of 1 expansion section, is directly connected with the carbon capturing synchronous generator (15), and outputs normal-pressure low-temperature nitrogen and oxygen while the output of the carbon capturing synchronous generator (15) is parallel to a power grid, is same in frequency and phase, and can convert the internal energy of high-pressure nitrogen plus oxygen into the electric energy required by the power grid efficiently; the atmospheric low-temperature nitrogen and oxygen are precooled by a rotary smoke purifying precooler (22) to meet the near zero emission standard of atmospheric pollutantsClean flue gas of a coal power station boiler; supercritical CO 2 The pressure bearing layer of the temporary storage spherical tank (18) is formed by welding pearlitic low alloy steel forgings with good weldability, and the inner layer is overlaid with martensitic stainless steel to prevent supercritical CO 2 The pressure bearing layer is outwards provided with a vacuum heat insulation outer shell layer, an aluminum silicate cotton felt high temperature resistant heat preservation layer, a polyurethane foam heat preservation layer and an aluminum outer guard plate, the design working pressure is 12MPa, and the design working temperature is 350 ℃; supercritical CO 2 The inlet of the delivery pump (19) is connected with supercritical CO 2 Supercritical CO at the bottom of the separator (20) 2 Outlet, supercritical CO 2 The outlet of the delivery pump (19) is connected with supercritical CO 2 Supercritical CO of temporary storage spherical tank (18) 2 Inlet pipeline for always maintaining CO in the whole conveying process 2 Is in a supercritical state; supercritical CO 2 Supercritical CO of temporary storage spherical tank (18) 2 Outlet pipe and supercritical CO 2 The inlet of the output pump (17) is connected with supercritical CO 2 The outlet pressure of the output pump (17) is 12MPa and the supercritical CO 2 The output pipeline system is connected, the maximum conveying distance is 250km, a middle booster pump is not needed, and CO is always maintained in the whole output process 2 Is in a supercritical state; the carbon capturing medium frequency variable frequency power supply (1) is a giant power module serial high voltage variable frequency power supply, is input with 3-phase 6kV/10kV power frequency, outputs 3-phase 1Hz to 120Hz, and has 0.06kV/0.1kV-6kV/10kV and overload coefficient of 1.5; the energy-saving control device has two operation modes, namely a starting mode and an energy-saving mode; a start mode including a 0-speed start and a spin start having vector control characteristics; a power saving mode having a VVF characteristic; water cooling an IGBT power electronic device; the carbon capturing medium-frequency variable-frequency power supply (1) comprises a static excitation device required by a carbon capturing high-speed synchronous motor (2) and a static excitation device required by a carbon capturing synchronous generator (15); the main control board of the carbon capturing medium frequency conversion power supply (1) and the main control board of the static excitation device are communicated with each other, so that the carbon capturing high-speed synchronous motor (2) is ensured not to be out of step, and meanwhile, high efficiency and high power factors are maintained; ensuring that the outlet voltage and the power factor of the carbon capturing synchronous generator (15) are at target values; the carbon capturing medium frequency conversion power supply (1) is controlled by the measurement control subsystem when the carbon capturing working condition of the carbon capturing multistage turbine compressor (3) is driven, and the carbon capturing medium frequency conversion power supply (1) is used in the whole process; the whole process provides a carbon capturing synchronous generator 15 The required exciting current stabilizes the outlet voltage and the power factor of the carbon capturing synchronous generator (15) at target values; forced ventilation, water air cooling and protection grade IP54 of the carbon capturing high-speed synchronous motor (2); the carbon capturing synchronous generator (15) is cooled in a hydro-hydro mode; the multistage turbine type gas expander (16) is provided with a speed regulating valve, an automatic main valve and a bypass throttle valve, and an automatic quasi-synchronization device has the capabilities of using a high-pressure nitrogen and oxygen mixture, flushing, accelerating, warming up and synchronization grid connection; the deep-cooling medium-frequency variable-frequency power supply (4) is a giant power module serial high-voltage variable-frequency power supply, is input with 3-phase 6kV/10kV power frequency, outputs 3-phase 1Hz to 120Hz, and has 0.06kV/0.1kV-6kV/10kV and overload coefficient of 1.5; the energy-saving control device has two operation modes, namely a starting mode and an energy-saving mode; a start mode including a 0-speed start and a spin start having vector control characteristics; a power saving mode having a VVF characteristic; water cooling an IGBT power electronic device; the cryogenic intermediate frequency variable frequency power supply (4) comprises a static excitation device required by a cryogenic high-speed synchronous motor (5) and a static excitation device required by a cryogenic synchronous generator (8); the main control board of the cryogenic intermediate frequency variable frequency power supply (4) is communicated with the main control board of the static excitation device, so that the cryogenic high-speed synchronous motor (5) is ensured not to be out of step, and meanwhile, high efficiency and high power factors are maintained; ensuring that the outlet voltage and the power factor of the cryogenic synchronous generator (8) are at target values; when the cryogenic intermediate frequency variable frequency power supply (4) drives a cryogenic multistage turbine compressor (6) under the cryogenic working condition, the cryogenic intermediate frequency variable frequency power supply (4) is used in the whole process under the control of a measurement control subsystem; the cryogenic multistage turbine type gas expander (7) is provided with a speed regulating valve, an automatic main valve and a bypass throttle valve, and an automatic quasi-synchronization device has the capabilities of using a high-pressure nitrogen and oxygen mixture, flushing, accelerating, warming up and synchronization grid connection; forced ventilation, water cooling and protection grade IP54 of the cryogenic high-speed synchronous motor (5); the cryogenic synchronous generator (8) is cooled by a water hydrogen mode.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117570628A (en) * | 2023-12-27 | 2024-02-20 | 济南金孚瑞热能设备制造有限公司 | Efficient refrigerating device for peak shaving and energy storage of virtual power plant |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117570628A (en) * | 2023-12-27 | 2024-02-20 | 济南金孚瑞热能设备制造有限公司 | Efficient refrigerating device for peak shaving and energy storage of virtual power plant |
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