CN210422706U - Double-working-medium coal-fired power generation system - Google Patents
Double-working-medium coal-fired power generation system Download PDFInfo
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- CN210422706U CN210422706U CN201921277280.5U CN201921277280U CN210422706U CN 210422706 U CN210422706 U CN 210422706U CN 201921277280 U CN201921277280 U CN 201921277280U CN 210422706 U CN210422706 U CN 210422706U
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Abstract
The utility model discloses a two working medium coal-fired power generation systems, including the boiler, supercritical carbon dioxide circulation, ultra supercritical steam circulation, furnace has, horizontal flue and afterbody flue, furnace's lower part is equipped with the water-cooling wall, the air-cooling wall, furnace's upper portion is equipped with steam superheater, the carbon dioxide over heater, supercritical carbon dioxide circulation includes the main compressor, the low temperature regenerator, the high temperature regenerator, high pressure carbon dioxide turbine, the medium pressure carbon dioxide turbine, low pressure carbon dioxide turbine import, recompressor and first generator, ultra supercritical steam circulation includes waste heat exchanger, the precooler, the condensate pump, low pressure heater, the oxygen-eliminating device, the water-feeding pump, high pressure heater, the economizer, steam superheater, high pressure steam turbine, medium pressure steam turbine, low pressure steam turbine, condenser and second generator. The utility model discloses a power generation system has combined the advantage of super supercritical steam circulation with super supercritical carbon dioxide circulation, increases substantially the generating efficiency of unit.
Description
Technical Field
The utility model relates to the technical field of power generation, especially, relate to a coal-fired power generation system of two working mediums.
Background
Coal-fired power generation is one of the main power supply modes in China, and still occupies the largest power generation share at present and in a quite long period of time in the future, but the coal-fired power generation is facing the severe situation of quality improvement, efficiency improvement and transformation development. In the long run, in order to meet the requirement of reducing carbon dioxide emission, on one hand, the development of a unit with higher parameters, namely the next generation of 700 ℃ grade ultra-supercritical unit, needs to be accelerated, however, the technical route needs to adopt a large amount of expensive nickel-based high-temperature alloy, and the unit cost is very high; on the other hand, a new coal-fired power generation technology needs to be innovatively developed on the basis of the existing 600 ℃ grade material and equipment manufacturing technology.
In recent years, the supercritical carbon dioxide circulation technology is developed rapidly, and the key technology is continuously broken through. The supercritical carbon dioxide circulating system is simple, compact in structure, high in efficiency and capable of being air-cooled, and can form a power generation system together with various heat sources. Therefore, the supercritical carbon dioxide cycle has good application prospects in the fields of thermal power generation, nuclear power generation, solar thermal power generation, waste heat power generation, geothermal power generation, biomass power generation and the like. The supercritical carbon dioxide circulation can also be integrated with a boiler to replace a steam turbine to form a novel coal-fired power generation system, and the power generation efficiency of the supercritical carbon dioxide circulation unit at the 600 ℃ level is expected to reach the level of the supercritical unit at the 700 ℃ level.
However, the supercritical carbon dioxide cycle has a deep heat recovery characteristic, and when the supercritical carbon dioxide cycle is directly combined with a boiler, the temperature of a working medium entering the boiler is very high, so that two problems are caused. On one hand, the exhaust gas temperature of the boiler is too high, and the thermal efficiency of the boiler is damaged; on the other hand, the wall surface of the hearth cannot be effectively cooled, and the temperature is too high, so that the wall surface heat preservation and the structural strength of the furnace wall are influenced. Therefore, the supercritical carbon dioxide circulation is reasonably combined with a boiler aiming at the characteristics of the supercritical carbon dioxide circulation so as to improve the generating efficiency of the unit.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings of the prior art, the to-be-solved technical problem of the present invention is to provide a coal-fired power generation system based on supercritical carbon dioxide circulation to overcome the problem that supercritical carbon dioxide circulation and boiler are difficult to combine.
In order to solve the technical problem, the utility model provides a double-working-medium coal-fired power generation system, which comprises a boiler, a supercritical carbon dioxide cycle and an ultra-supercritical steam cycle;
the boiler is provided with a hearth, a horizontal flue and a tail flue, a water-cooled wall and a gas-cooled wall are arranged at the lower part of the hearth, a steam superheater and a carbon dioxide superheater are arranged at the upper part of the hearth, a high-temperature steam reheater and a carbon dioxide secondary reheater are arranged above the horizontal flue, and a carbon dioxide primary reheater, a low-temperature steam reheater and an economizer are arranged in the tail flue;
the supercritical carbon dioxide cycle comprises a main compressor, a low-temperature regenerator, a high-pressure carbon dioxide turbine, a medium-pressure carbon dioxide turbine, a low-pressure carbon dioxide turbine inlet, a recompressor and a first generator, wherein the outlet of the main compressor is connected with the high-pressure side inlet of the low-temperature regenerator, the high-pressure side inlet of the low-temperature regenerator is connected with the high-pressure side inlet of the high-temperature regenerator, the high-pressure side outlet of the high-temperature regenerator is connected with the inlet of the air-cooled wall, the outlet of the air-cooled wall is connected with the inlet of the carbon dioxide superheater, the outlet of the carbon dioxide superheater is connected with the inlet of the high-pressure carbon dioxide turbine, the outlet of the high-pressure carbon dioxide turbine is connected with the inlet of the carbon dioxide primary reheater, an outlet of the medium-pressure carbon dioxide turbine is connected with an inlet of the carbon dioxide secondary reheater, an outlet of the carbon dioxide secondary reheater is connected with an inlet of the low-pressure carbon dioxide turbine, an outlet of the low-pressure carbon dioxide turbine is connected with a low-pressure side inlet of the high-temperature reheater, a low-pressure side outlet of the high-temperature reheater is connected with a low-pressure side inlet of the low-temperature reheater, a low-pressure side outlet of the low-temperature reheater is connected with an inlet of the recompressor, an outlet of the recompressor is connected with a high-pressure side inlet of the high-temperature reheater, and the first generator is connected with the recompressor;
the ultra-supercritical steam cycle comprises a waste heat exchanger, a precooler, a condensate pump, a low-pressure heater, a deaerator, a water feeding pump, a high-pressure heater, an economizer, a steam superheater, a high-pressure steam turbine, a medium-pressure steam turbine, a low-pressure steam turbine, a condenser and a second generator, wherein a carbon dioxide working medium inlet of the waste heat exchanger is connected with a low-pressure side outlet of the low-temperature reheater, a carbon dioxide working medium outlet of the waste heat exchanger is connected with a working medium inlet of the precooler, a working medium outlet of the precooler is connected with an inlet of the main compressor, an outlet of the condensate pump is connected with a water working medium inlet of the waste heat exchanger, a water working medium outlet of the waste heat exchanger is connected with an inlet of the low-pressure heater, an outlet of the low-pressure heater is connected with an inlet of the, the outlet of the feed water pump is connected with the inlet of the high-pressure heater, the outlet of the high-pressure heater is connected with the inlet of the economizer, the outlet of the economizer is connected with the inlet of the water-cooled wall, the outlet of the water-cooled wall is connected with the inlet of the steam superheater, the outlet of the steam superheater is connected with the inlet of the high-pressure steam turbine, the outlet of the high-pressure steam turbine is connected with the inlet of the low-temperature steam reheater, the outlet of the low-temperature steam reheater is connected with the inlet of the high-temperature steam reheater, the outlet of the high-temperature steam reheater is connected with the inlet of the medium-pressure steam turbine, the outlet of the medium-pressure steam turbine is connected with the inlet of the low-pressure steam turbine, the outlet of the low-pressure steam turbine is connected with the working medium inlet of the condenser, and a working medium outlet of the condenser is connected with an inlet of the condensed water pump, and the second generator is connected with the low-pressure steam turbine.
Optionally, the dual-working-medium coal-fired power generation system comprises at least two boilers, and the boilers are connected in parallel.
Optionally, the main compressor, the recompressor, the high-pressure carbon dioxide turbine, the medium-pressure carbon dioxide turbine, the low-pressure carbon dioxide turbine, and the first generator are coaxially arranged.
Optionally, the supercritical carbon dioxide cycle is arranged at a high position. The utility model discloses technical scheme high-order arrange mean, arrange in and be higher than the third position department of boiler.
Optionally, the high pressure steam turbine, the intermediate pressure steam turbine, the low pressure steam turbine and the second generator are arranged coaxially.
Optionally, the ratio of the heat provided by the boiler to the supercritical carbon dioxide cycle to the heat provided by the boiler to the supercritical steam cycle is 2-4.
Compared with the prior art, the utility model discloses technical scheme's two coal-fired power generation systems of working medium have following beneficial effect:
1. the material of the existing ultra-supercritical steam turbine set with the temperature of 600 ℃ can be adopted, the equipment cost is ensured to be equivalent to that of the existing ultra-supercritical steam turbine set, meanwhile, the high efficiency advantage of the supercritical carbon dioxide circulation is well exerted, the power generation efficiency of the set is improved, and the power generation cost of the set is superior to that of the existing ultra-supercritical steam turbine set;
2. supercritical carbon dioxide circulation replaces a part of supercritical steam circulation, and supercritical steam circulation can fully absorb the heat of discharging fume of the boiler, ensures the thermal efficiency of the boiler, has the high efficiency characteristics of supercritical carbon dioxide circulation simultaneously, combines the advantages of the supercritical carbon dioxide circulation and the supercritical carbon dioxide circulation, greatly improves the generating efficiency of the unit, and the utility model discloses a 620 ℃ -630 ℃ grade of unit can reach 700 ℃ grade of generating efficiency of supercritical steam turbine unit.
3. The utility model discloses a boiler adopts the combination of water-cooling wall and air-cooling wall, and the boiler remains more water-cooling wall quantity, has ensured the cooling that the oven can be better to make full use of boiler burning radiation heat transfer's high heat transfer intensity reduces receives hot side quantity, makes the security and the reliability of boiler show the promotion.
Drawings
Fig. 1 is a schematic structural diagram of a dual-working medium coal-fired power generation system according to an embodiment of the present invention;
wherein: 1-boiler, 2-water wall, 3-air wall, 4-steam superheater, 5-carbon dioxide superheater, 6-high temperature steam reheater, 7-carbon dioxide secondary reheater, 8-carbon dioxide primary reheater, 9-low temperature steam reheater, 10-economizer, 21-main compressor, 22-low temperature reheater, 23-high temperature reheater, 24-high pressure carbon dioxide turbine, 25-medium pressure carbon dioxide turbine, 26-low pressure carbon dioxide turbine, 27-recompressor, 28-precooler, 29-first generator, 30-waste heat exchanger, 31-condensate pump, 32-low pressure heater, 33-deaerator, 34-water feed pump, 35-high pressure heater, 36-high pressure steam turbine, 37-medium pressure steam turbine, 38-low pressure steam turbine, 39-condenser, 40-second generator.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the following examples.
As shown in fig. 1, the biomass direct-fired power generation system of the embodiment of the present invention mainly includes a boiler 1, a supercritical carbon dioxide cycle, and an supercritical steam cycle.
The boiler 1 is provided with a hearth, a horizontal flue and a tail flue, a water cooling wall 2 and a gas cooling wall 3 are arranged at the lower part of the hearth, a steam superheater 4 and a carbon dioxide superheater 5 are arranged at the upper part of the hearth, a high-temperature steam reheater 6 and a carbon dioxide secondary reheater 7 are arranged above the horizontal flue, and a carbon dioxide primary reheater 8, a low-temperature steam reheater 9 and an economizer 10 are arranged in the tail flue.
Fig. 1 shows the case that two boilers 1 are connected in parallel, in other embodiments, more than two boilers 1 may be included, and the boilers 1 are arranged according to actual needs, and the boilers 1 are connected in parallel to form a large-capacity boiler 1.
The supercritical carbon dioxide is circularly arranged at a high position, so that the length and pressure loss of a carbon dioxide working medium pipeline are reduced. The system mainly comprises a main compressor 21, a low-temperature heat regenerator 22, a high-temperature heat regenerator 23, a high-pressure carbon dioxide turbine 24, a medium-pressure carbon dioxide turbine 25, a low-pressure carbon dioxide turbine 26 inlet, a recompressor 27 and a first generator 29.
The outlet of the main compressor 21 is connected with the high-pressure side inlet of the low-temperature regenerator 22, the high-pressure side inlet of the low-temperature regenerator 22 is connected with the high-pressure side inlet of the high-temperature regenerator 23, the high-pressure side outlet of the high-temperature regenerator 23 is connected with the inlet of the air-cooled wall 3, the outlet of the air-cooled wall 3 is connected with the inlet of the carbon dioxide superheater 5, the outlet of the carbon dioxide superheater 5 is connected with the inlet of the high-pressure carbon dioxide turbine 24, the outlet of the high-pressure carbon dioxide turbine 24 is connected with the inlet of the primary carbon dioxide reheater 8, the outlet of the primary carbon dioxide reheater 8 is connected with the inlet of the medium-pressure carbon dioxide turbine 25, the outlet of the medium-pressure carbon dioxide turbine 25 is connected with the inlet of the secondary carbon dioxide reheater 7, the outlet, the low-pressure side outlet of the high-temperature regenerator 23 is connected with the low-pressure side inlet of the low-temperature regenerator 22, the low-pressure side outlet of the low-temperature regenerator 22 is connected with the inlet of the recompressor 27, the outlet of the recompressor 27 is connected with the high-pressure side inlet of the high-temperature regenerator 23, and the first generator 29 is connected with the recompressor 27 and the low-pressure carbon dioxide turbine 26.
The ultra-supercritical steam cycle includes a waste heat exchanger 30, a precooler 28, a condensate pump 31, a low-pressure heater 32, a deaerator 33, a feed water pump 34, a high-pressure heater 35, an economizer 10, a steam superheater 4, a high-pressure steam turbine 36, an intermediate-pressure steam turbine 37, a low-pressure steam turbine 38, a condenser, and a second generator 40. The high-pressure steam turbine 36, the intermediate-pressure steam turbine 37, the low-pressure steam turbine 38 and the second generator 40 are arranged coaxially.
A carbon dioxide working medium inlet of the waste heat exchanger 30 is connected with a low-pressure side outlet of the low-temperature heat regenerator 22, a carbon dioxide working medium outlet of the waste heat exchanger 30 is connected with a working medium inlet of the precooler 28, a working medium outlet of the precooler 28 is connected with an inlet of the main compressor 21, an outlet of the condensate pump 31 is connected with a water working medium inlet of the waste heat exchanger 30, a water working medium outlet of the waste heat exchanger 30 is connected with an inlet of the low-pressure heater 32, an outlet of the low-pressure heater 32 is connected with an inlet of the deaerator 33, an outlet of the deaerator 33 is connected with an inlet of the water feed pump 34, an outlet of the water feed pump 34 is connected with an inlet of the high-pressure heater 35, an outlet of the high-pressure heater 35 is connected with an inlet of the economizer 10, an outlet of the economizer 10 is connected with an inlet of the water-cooled wall 2, an outlet of the water-cooled wall 2 is, an outlet of the low-temperature steam reheater 9 is connected with an inlet of the high-temperature steam reheater 6, an outlet of the high-temperature steam reheater 6 is connected with an inlet of the medium-pressure steam turbine 37, an outlet of the medium-pressure steam turbine 37 is connected with an inlet of the low-pressure steam turbine 38, an outlet of the low-pressure steam turbine 38 is connected with a working medium inlet of the condenser 39, a working medium outlet of the condenser 39 is connected with an inlet of the condensate pump 31, and the second generator 40 is connected with the low-pressure steam turbine 38.
In the power generation system of the embodiment of the utility model, the temperature of the supercritical carbon dioxide circulation is not higher than 650 ℃, and the pressure is not higher than 35 MPa. The temperature of the ultra-supercritical steam cycle is not higher than 650 ℃, and the pressure is not higher than 35 MPa.
The ratio of the heat provided by the boiler 1 to the supercritical carbon dioxide cycle to the heat provided by the boiler 1 to the supercritical steam cycle is 2-4.
The power generation capacity of the whole power generation system is more than 1000MW, wherein the power generation capacity of the ultra-supercritical steam cycle is more than 300 MW.
The utility model discloses technical scheme's biomass direct combustion power generation system's operating method as follows:
in the supercritical carbon dioxide cycle, a split-flow recompression secondary reheating cycle mode is adopted, carbon dioxide working medium enters a main compressor 21 for pressurization, is discharged from an outlet of the main compressor 21 and enters a low-temperature heat regenerator 22, the low-temperature heat regenerator 22 absorbs the low-temperature section heat of the working medium discharged by a low-pressure carbon dioxide turbine 26, then is converged with the working medium at an outlet of a recompressor 27, enters a high-temperature heat regenerator 23 and absorbs the high-temperature section heat of the working medium discharged by a low-pressure carbon dioxide turbine 26, the working medium discharged from the high-temperature heat regenerator 23 absorbs the heat to be 620 ℃ through a gas cooling wall 3 and a carbon dioxide superheater 5, the pressure is 30MPa, then enters a high-pressure carbon dioxide turbine 24 for acting, the working medium discharged from the high-pressure carbon dioxide turbine 24 is heated to 620 ℃ through a carbon dioxide primary reheater 8 and then enters a medium-pressure, then the exhaust gas enters a low-pressure carbon dioxide turbine 26 to do work, and the exhaust gas of the low-pressure carbon dioxide turbine 26 releases heat through a high-temperature heat regenerator 23 and a low-temperature heat regenerator 22 and is divided into two paths: one path enters a re-compressor 27, the other path enters a waste heat exchanger 30 to release waste heat to condensed water, and the condensed water enters a precooler 28 to be cooled and then returns to the main compressor 21.
In the ultra-supercritical steam cycle, a conventional once reheating cycle is adopted, a condensate pump 31 sends water into a waste heat exchanger 30 to absorb waste heat of a carbon dioxide working medium, the waste heat is heated by a low-pressure heater 32 and then enters a deaerator 33, the waste heat is sent into a high-pressure heater 35 by a water feed pump 34 to be heated, the waste heat enters an economizer 10 to be heated, then enters a water-cooled wall 2 to be heated, then enters a steam superheater 4 to be heated to 620 ℃ and the pressure is 31MPa, then enters a high-pressure steam turbine 36 to do work, steam discharged by the high-pressure steam turbine 36 enters a low-temperature steam reheater 9 to be heated, then enters a high-temperature steam reheater 6 to be heated to 620 ℃, enters a medium-pressure steam turbine 37 to do work, steam discharged by the medium-pressure steam turbine 37 enters.
The high-pressure steam turbine 36 and the intermediate-pressure steam turbine 37 are provided with steam extraction systems for supplying steam to the high-pressure heater 35, the intermediate-pressure steam turbine 37 is provided with a steam extraction system for supplying steam to the deaerator 33 and the low-pressure heater 32, and the low-pressure steam turbine 38 is provided with a steam extraction system for supplying steam to the low-pressure heater 32.
It should be noted that, the utility model discloses the equipment that technical scheme related all belongs to existing equipment, in this embodiment, specifically adopts following equipment: the system comprises a boiler, a water-cooled wall, a gas-cooled wall, a steam superheater, a carbon dioxide superheater, a high-temperature steam reheater, a carbon dioxide secondary reheater, a carbon dioxide primary reheater, a low-temperature steam reheater, an economizer, a main compressor, a low-temperature reheater, a high-pressure carbon dioxide turbine, a medium-pressure carbon dioxide turbine, a low-pressure carbon dioxide turbine, a recompressor, a precooler, a first generator, a waste heat exchanger, a condensate pump, a low-pressure heater, a deaerator, a water-feeding pump, a high-pressure heater, a high-pressure steam turbine, a medium-pressure steam turbine, a low.
The power generation system of the present embodiment employs two boilers 1 connected in parallel, and the ratio of the amount of heat supplied to the supercritical carbon dioxide cycle and the supercritical steam cycle is about 2.
The power generation capacity of the power generation system is 1980MW, wherein the power generation capacity of the supercritical carbon dioxide cycle is 1320MW, and the power generation capacity of the supercritical steam cycle is 660 MW.
When the equipment that adopts high performance (carbon dioxide turbine efficiency is more than 92%, and carbon dioxide compressor efficiency is more than 85%), the utility model discloses coal-fired power generation system's clean efficiency of electricity generation can reach more than 49% (LHV), is higher than current supercritical turbo generator unit of 620 ℃ temperature parameter about 3 percentage points, reaches 700 ℃ super supercritical turbo generator unit's of grade efficiency level. The power generation system in the embodiment can adopt the existing material of the supercritical steam turbine generator unit with the temperature parameter of 620 ℃, does not need to use a higher-grade material, has the advantages of system simplification and compact structure of supercritical carbon dioxide circulation, and has good economic advantage in the aspect of equipment manufacturing cost.
While specific embodiments of the present invention have been described in detail, it will be appreciated that modifications and variations can be made by persons skilled in the art in light of the above teachings without inventive faculty. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (6)
1. A double-working-medium coal-fired power generation system is characterized by comprising a boiler, a supercritical carbon dioxide cycle and a supercritical steam cycle;
the boiler is provided with a hearth, a horizontal flue and a tail flue, a water-cooled wall and a gas-cooled wall are arranged at the lower part of the hearth, a steam superheater and a carbon dioxide superheater are arranged at the upper part of the hearth, a high-temperature steam reheater and a carbon dioxide secondary reheater are arranged above the horizontal flue, and a carbon dioxide primary reheater, a low-temperature steam reheater and an economizer are arranged in the tail flue;
the supercritical carbon dioxide cycle comprises a main compressor, a low-temperature regenerator, a high-pressure carbon dioxide turbine, a medium-pressure carbon dioxide turbine, a low-pressure carbon dioxide turbine inlet, a recompressor and a first generator, wherein the outlet of the main compressor is connected with the high-pressure side inlet of the low-temperature regenerator, the high-pressure side inlet of the low-temperature regenerator is connected with the high-pressure side inlet of the high-temperature regenerator, the high-pressure side outlet of the high-temperature regenerator is connected with the inlet of the air-cooled wall, the outlet of the air-cooled wall is connected with the inlet of the carbon dioxide superheater, the outlet of the carbon dioxide superheater is connected with the inlet of the high-pressure carbon dioxide turbine, the outlet of the high-pressure carbon dioxide turbine is connected with the inlet of the carbon dioxide primary reheater, an outlet of the medium-pressure carbon dioxide turbine is connected with an inlet of the carbon dioxide secondary reheater, an outlet of the carbon dioxide secondary reheater is connected with an inlet of the low-pressure carbon dioxide turbine, an outlet of the low-pressure carbon dioxide turbine is connected with a low-pressure side inlet of the high-temperature reheater, a low-pressure side outlet of the high-temperature reheater is connected with a low-pressure side inlet of the low-temperature reheater, a low-pressure side outlet of the low-temperature reheater is connected with an inlet of the recompressor, an outlet of the recompressor is connected with a high-pressure side inlet of the high-temperature reheater, and the first generator is connected with the recompressor;
the ultra-supercritical steam cycle comprises a waste heat exchanger, a precooler, a condensate pump, a low-pressure heater, a deaerator, a water feeding pump, a high-pressure heater, an economizer, a steam superheater, a high-pressure steam turbine, a medium-pressure steam turbine, a low-pressure steam turbine, a condenser and a second generator, wherein a carbon dioxide working medium inlet of the waste heat exchanger is connected with a low-pressure side outlet of the low-temperature reheater, a carbon dioxide working medium outlet of the waste heat exchanger is connected with a working medium inlet of the precooler, a working medium outlet of the precooler is connected with an inlet of the main compressor, an outlet of the condensate pump is connected with a water working medium inlet of the waste heat exchanger, a water working medium outlet of the waste heat exchanger is connected with an inlet of the low-pressure heater, an outlet of the low-pressure heater is connected with an inlet of the, the outlet of the feed water pump is connected with the inlet of the high-pressure heater, the outlet of the high-pressure heater is connected with the inlet of the economizer, the outlet of the economizer is connected with the inlet of the water-cooled wall, the outlet of the water-cooled wall is connected with the inlet of the steam superheater, the outlet of the steam superheater is connected with the inlet of the high-pressure steam turbine, the outlet of the high-pressure steam turbine is connected with the inlet of the low-temperature steam reheater, the outlet of the low-temperature steam reheater is connected with the inlet of the high-temperature steam reheater, the outlet of the high-temperature steam reheater is connected with the inlet of the medium-pressure steam turbine, the outlet of the medium-pressure steam turbine is connected with the inlet of the low-pressure steam turbine, the outlet of the low-pressure steam turbine is connected with the working medium inlet of the condenser, the working medium outlet of the condenser is connected with the inlet of the condensed water pump, and the second generator is connected with the low-pressure steam turbine.
2. The dual-quality coal-fired power generation system of claim 1, comprising at least two boilers, wherein each of said boilers are connected in parallel.
3. The dual-working-medium coal-fired power generation system of claim 1, wherein the main compressor, the recompressor, the high pressure carbon dioxide turbine, the medium pressure carbon dioxide turbine, the low pressure carbon dioxide turbine, and the first generator are coaxially arranged.
4. The dual-quality coal-fired power generation system of claim 1, wherein the supercritical carbon dioxide cycle is in an elevated arrangement.
5. The dual-working-medium coal-fired power generation system of claim 1, wherein the high pressure steam turbine, the intermediate pressure steam turbine, the low pressure steam turbine, and the second generator are coaxially arranged.
6. The dual-working-medium coal-fired power generation system of claim 1, wherein the ratio of the amount of heat provided by the boiler to the supercritical carbon dioxide cycle to the amount of heat provided by the boiler to the supercritical steam cycle is 2 to 4.
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