CN214307058U - High-efficient supercritical carbon dioxide boiler with two working mediums - Google Patents

High-efficient supercritical carbon dioxide boiler with two working mediums Download PDF

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Publication number
CN214307058U
CN214307058U CN202120170410.6U CN202120170410U CN214307058U CN 214307058 U CN214307058 U CN 214307058U CN 202120170410 U CN202120170410 U CN 202120170410U CN 214307058 U CN214307058 U CN 214307058U
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temperature
superheater
carbon dioxide
external
supercritical carbon
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CN202120170410.6U
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王林
刘岗
张亚夫
王红雨
孟颖琪
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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Abstract

The utility model discloses a high-efficiency supercritical carbon dioxide boiler with double working media, which comprises a hearth, a horizontal flue and a tail vertical flue; furnace with a heat exchangerThe flue gas outlet of the hearth is communicated with the horizontal flue and the tail vertical flue, the hearth is internally provided with a gas cooling wall, and screen type CO is sequentially arranged in the horizontal flue along the flow direction of the flue gas2Superheater, high temperature CO2Superheater and high temperature CO2A reheater, wherein low-temperature CO is sequentially arranged in a vertical flue at the tail part from top to bottom2Reheater, low temperature CO2Superheater, water wall and economizer, wherein, air wall, low temperature CO2Superheater, platen CO2Superheater, high temperature CO2Superheater, low temperature CO2Reheater and high temperature CO2The working medium circulating in the reheater is carbon dioxide, the working medium circulating in the economizer and the water-cooled wall is water, the working medium circulating in the superheater is steam, and the boiler can overcome the defect of supercritical CO2The working medium temperature is high, and the tail low-temperature smoke heat is difficult to absorb.

Description

High-efficient supercritical carbon dioxide boiler with two working mediums
Technical Field
The utility model belongs to the technical field of the boiler of thermal power plant, a high-efficient supercritical carbon dioxide boiler with two working mediums is related to.
Background
The power generation process of modern coal-fired power plants is based on a steam rankine cycle. The Rankine cycle is the simplest steam power cycle and consists of four main devices, namely a water pump, a boiler, a steam turbine and a condenser. The water is compressed and pressurized in the water pump; then the steam enters a boiler to be heated and vaporized until the steam becomes superheated steam, the superheated steam enters a steam turbine to expand and work (drive a generator to generate electricity), and low-pressure steam after working enters a condenser to be cooled and condensed into water. And then returns to the water pump to complete a work cycle.
Supercritical carbon dioxide (S-CO)2) The power generation system is CO in a supercritical state2The Brayton cycle system is a working medium, and the cycle process comprises the following steps: first, S-CO2Boosting the pressure by a compressor; then, the S-CO is heated by an external heater2Working medium isobaric heating; secondly, the working medium enters a turbine to push the turbine to do work, and the turbine drives a motor to generate power; finally, S-CO2The working medium enters the cooler and is restored to the initial state. Then enters the compressor to form a closed cycle.
Carbon dioxide has a very unique physical property: when the temperature reaches 30.98 ℃ and the pressure reaches 7.38MPa (namely CO)2Am (c) amBoundary point) having a physical state between liquid and gas, a density close to liquid, a viscosity close to gas, and a diffusion coefficient of about 100 times that of liquid. This state is referred to as the "supercritical" state. The carbon dioxide in a supercritical state has the characteristics of high density compared with gas, low viscosity compared with liquid, strong liquidity, high heat transfer efficiency, low compressibility and the like. Compared with the critical value of 373.95 ℃/22.04MPa of water, the lower energy consumption can ensure that CO is generated2The supercritical carbon dioxide cycle power generation system can effectively improve the power generation efficiency of the unit by using the supercritical carbon dioxide cycle power generation system as a cycle working medium when reaching a critical state, so that the supercritical carbon dioxide cycle power generation technology has bright development prospect.
Then, in the design and simulation calculation, the supercritical carbon dioxide boiler is found to have the following problems:
due to the existing supercritical CO2The high/low temperature heat regenerator and CO are designed in the circulating power generation system2Are preheated by them before entering the boiler, and the temperature is up to 500 ℃. Compared with the average water supply temperature of 300 ℃ of the steam boiler, the temperature of the working medium at the inlet of the carbon dioxide boiler is higher by nearly 200 ℃. Higher temperature CO2After entering the boiler, the flue gas can only absorb the heat of the flue gas with the temperature higher than that of the flue gas, and the flue gas with the temperature lower than 500 ℃ can only absorb the heat of the flue gas with the temperature higher than that of the flue gas with the temperature lower than 500 ℃ and can only absorb the heat of the flue gas with the temperature higher than that of the flue gas with the temperature lower than that of the flue gas with the temperature higher than that of the flue gas2The heating effect will be lost. The low-temperature flue gas in the tail flue can not be absorbed, and the contained heat can only be discharged to the atmosphere. This entails a great loss of exhaust fumes, seriously reducing the thermal efficiency of the boiler.
How to overcome the supercritical CO2The difficulty of high working medium temperature and tail low-temperature flue gas heat absorption is a problem which has to be considered in designing a supercritical carbon dioxide boiler with practical prospect.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a high-efficient supercritical carbon dioxide boiler with two working mediums, supercritical CO can be overcome to this boiler2The working medium temperature is high, and the tail low-temperature smoke heat is difficult to absorb.
In order to achieve the purpose, the high-efficiency supercritical carbon dioxide boiler with double working media comprises a hearth, a horizontal flue and a tail vertical flue;
the flue gas outlet of the hearth is communicated with the horizontal flue and the vertical flue at the tail part, the inside of the hearth is provided with a gas cooling wall, and screen type CO is sequentially arranged in the horizontal flue along the flow direction of the flue gas2Superheater, high temperature CO2Superheater and high temperature CO2A reheater, wherein low-temperature CO is sequentially arranged in a vertical flue at the tail part from top to bottom2Reheater, low temperature CO2Superheater, water wall and economizer, wherein, air wall, low temperature CO2Superheater, platen CO2Superheater, high temperature CO2Superheater, low temperature CO2Reheater and high temperature CO2The working medium circulating in the reheater is carbon dioxide, the working medium circulating in the economizer and the water-cooled wall is water, and the working medium circulating in the superheater is steam.
The outlet of the external compressor sequentially passes through the air-cooled wall and the low-temperature CO2Superheater, platen CO2Superheater, high temperature CO2Superheater, external high pressure turbine, low temperature CO2Reheater, high temperature CO2The reheater and the external low pressure turbine are connected to the external compressor inlet.
The outlet of the external feed water pump is communicated with the inlet of an external steam drum through an economizer and a water-cooled wall, and the steam outlet of the external steam drum is communicated with the inlet of an external back pressure machine through a heater.
The air-cooled wall structure further comprises an air-cooled wall inlet header tank, wherein an external compressor outlet is communicated with the air-cooled wall through the air-cooled wall inlet header tank.
Also comprises an outlet header of the gas-cooled wall, the gas-cooled wall passes through the outlet header of the gas-cooled wall and the low-temperature CO2The superheater is communicated with the water heater.
The system also comprises an economizer inlet header, wherein the outlet of an external feed water pump is communicated with the economizer through the economizer inlet header.
The water outlet of the external steam pocket is connected with a boiler drain pipeline.
The outlet of the tail vertical flue is connected with a chimney.
The steam outlet of the external back press is communicated with an industrial steam supply pipeline.
The water-cooled wall adopts a spiral structure.
The utility model discloses following beneficial effect has:
high-efficient supercritical carbon dioxide boiler with two working mediums adopt these two kinds of working mediums of vapor and carbon dioxide when concrete operation, gas wall, low temperature CO promptly2Superheater, platen CO2Superheater, high temperature CO2Superheater, low temperature CO2Reheater and high temperature CO2The working medium circulating in the reheater is carbon dioxide; the working medium circulating in the economizer and the water-cooled wall is water, the working medium circulating in the superheater is steam, namely CO is utilized2The heat of high and medium temperature flue gas is absorbed, the steam is used for absorbing the heat of low temperature flue gas in the tail flue, the problems of high temperature of working medium at the inlet of the supercritical carbon dioxide boiler and difficult absorption of the heat of the low temperature flue gas in the tail are thoroughly solved, and the S-CO is remarkably improved2The efficiency of the boiler is improved, and the generating efficiency of the unit is improved effectively.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Wherein 1 is the inlet header of the gas-cooled wall, 2 is the gas-cooled wall, 3 is the outlet header of the gas-cooled wall, and 4 is low-temperature CO2Superheater, 5 screen type CO2Superheater, 6 is high temperature CO2Superheater, high pressure turbine 7, and low temperature CO 82Reheater, 9 is high temperature CO2The system comprises a reheater, a low-pressure turbine 10, an economizer inlet header 11, an economizer 12, a water wall 13, a steam drum 14, a superheater 15 and a back press 16.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the high efficiency supercritical carbon dioxide boiler with dual working media of the present invention comprises a furnace, a horizontal flue and a tail vertical flue; the flue gas outlet of the hearth is communicated with the horizontal flue and the vertical flue at the tail part, the air cooling wall 2 is arranged in the hearth, and the screen type CO is sequentially arranged in the horizontal flue along the flow direction of the flue gas2Superheater 5, high temperature CO2Superheater 6 and high temperature CO2Reheater 9, vertical tail smokeThe interior of the pipeline is sequentially provided with low-temperature CO from top to bottom2Reheater 8, low temperature CO2A superheater 4, a superheater 15, a water wall 13 and an economizer 12, wherein the air wall 2 and the low-temperature CO are arranged2Superheater 4, platen CO2Superheater 5, high temperature CO2Superheater 6, low temperature CO2Reheater 8 and high temperature CO2The working medium circulating in the reheater 9 is carbon dioxide, the working medium circulating in the economizer 12 and the water wall 13 is water, and the working medium circulating in the superheater 15 is steam.
The outlet of the external compressor sequentially passes through the air-cooled wall 2 and the low-temperature CO2Superheater 4, platen CO2Superheater 5, high temperature CO2Superheater 6, external high-pressure turbine 7, low-temperature CO2Reheater 8, high temperature CO2Reheater 9 and external low pressure turbine 10 communicate with the external compressor inlet.
The outlet of the external feed water pump is communicated with the inlet of an external steam drum 14 through an economizer 12 and a water-cooled wall 13, and the steam outlet of the external steam drum 14 is communicated with the inlet of an external back pressure machine 16 through a heater 15.
The utility model discloses still include air-cooled wall entry header 1, wherein, the compressor export of external is linked together through air-cooled wall entry header 1 and air-cooled wall 2.
The utility model discloses still include the gas wall export collection case 3, gas wall 2 exports collection case 3 and low temperature CO through the gas wall2The superheater 4 is communicated.
The utility model discloses still include economizer entry collection case 11, wherein, the export of external feed water pump is linked together through economizer entry collection case 11 and economizer 12.
The water outlet of the external steam pocket 14 is connected with a boiler drain pipe; the outlet of the tail vertical flue is connected with a chimney; the steam outlet of the external back press 16 is communicated with an industrial steam supply pipeline; the water wall 13 adopts a spiral structure.
The utility model discloses a concrete working process does:
the utility model discloses a 2 set receive 1 furnace and flues of hot side sharing, and fuel is exothermic in the burning of furnace, and the CO of compressor output2Gas enters the gas-cooled wall 2 through the gas-cooled wall inlet header 1 and is absorbed in a radiation modeThe high temperature (more than 1000 ℃) flue gas heat of the flame central area of the hearth is sequentially processed by low temperature CO2Superheater 4, platen CO2Superheater 5 and high temperature CO2The superheater 6 continuously absorbs heat to finally reach rated parameters, then the heat is sent into the high-pressure turbine 7 to do work through expansion so as to drive the impeller to rotate and drive the generator to generate electricity, and exhaust gas discharged by the high-pressure turbine 7 sequentially passes through the low-temperature CO2Reheater 8 and high temperature CO2The reheater 9 absorbs heat, and then sends the heat to the low pressure turbine 10 to expand and do work to drive the impeller to rotate, and then drives the generator to generate electricity, and the exhaust gas discharged by the low pressure turbine 10 enters the compressor to prepare for the next cycle.
The flue gas discharged from the hearth passes through the screen type CO in sequence2Superheater 5, high temperature CO2Superheater 6, high temperature CO2Reheater 9, low temperature CO2Reheater 8 and low temperature CO2The superheater 4 enters the tail vertical flue after the heat exchange temperature is reduced to below 600 ℃, and then is discharged after the heat exchange temperature reduction is carried out through the superheater 15, the water wall 13 and the economizer 12 in the tail vertical flue.
Boiler feed water output by a feed pump enters an economizer 12 through an economizer inlet header 11 for heat exchange and preheating, and then enters a water-cooled wall 13 for heat absorption, wherein the water-cooled wall 13 adopts a spiral structure in consideration of the stability of hydrodynamic working conditions, hot water output by the water-cooled wall 13 enters a steam drum 14 for steam-water separation, separated wet steam enters a superheater 15 for continuous heating to form superheated steam and then is sent to a backpressure machine 16 for acting, tail steam discharged by the backpressure machine 16 is input into an industrial steam supply system for providing high-temperature steam for production for a heat user, and water separated by the steam drum 14 is output as boiler drain water.

Claims (10)

1. A high-efficiency supercritical carbon dioxide boiler with double working media is characterized by comprising a hearth, a horizontal flue and a tail vertical flue;
the flue gas outlet of the hearth is communicated with the horizontal flue and the vertical flue at the tail part, the inside of the hearth is provided with a gas cooling wall (2), and the inside of the horizontal flue is sequentially provided with a flue gas flowing directionScreen type CO2Superheater (5), high temperature CO2Superheater (6) and high temperature CO2A reheater (9) and a low-temperature CO are sequentially arranged in the vertical flue at the tail part from top to bottom2Reheater (8), low temperature CO2A superheater (4), a superheater (15), a water wall (13) and an economizer (12), wherein the air cooling wall (2) and the low-temperature CO2Superheater (4), screen type CO2Superheater (5), high temperature CO2Superheater (6), low temperature CO2Reheater (8) and high temperature CO2The working medium circulating in the reheater (9) is carbon dioxide, the working medium circulating in the economizer (12) and the water wall (13) is water, and the working medium circulating in the superheater (15) is steam.
2. The high-efficiency supercritical carbon dioxide boiler with two working fluids according to claim 1, characterized in that the external compressor outlet passes through the air-cooled wall (2) and the low-temperature CO in sequence2Superheater (4), screen type CO2Superheater (5), high temperature CO2Superheater (6), external high pressure turbine (7), low temperature CO2Reheater (8), high temperature CO2The reheater (9) and the external low-pressure turbine (10) are connected to the external compressor inlet.
3. The high-efficiency supercritical carbon dioxide boiler with two working fluids according to claim 1, characterized in that the outlet of the external feed water pump is communicated with the inlet of the external steam drum (14) through the economizer (12) and the water wall (13), and the steam outlet of the external steam drum (14) is communicated with the inlet of the external back pressure machine (16) through the heater (15).
4. The high-efficiency supercritical carbon dioxide boiler with two working fluids according to claim 2, characterized by further comprising a gas-cooled wall inlet header tank (1), wherein the external compressor outlet is communicated with the gas-cooled wall (2) through the gas-cooled wall inlet header tank (1).
5. The high-efficiency supercritical carbon dioxide boiler with two working fluids according to claim 2, characterized by further comprising a gas-cooled wall outlet header tank (3), wherein the gas-cooled wall (2) is collected through the gas-cooled wall outletTank (3) and low temperature CO2The superheater (4) is communicated.
6. The high-efficiency supercritical carbon dioxide boiler with two working fluids according to claim 3, characterized by further comprising an economizer inlet header (11), wherein the outlet of the external feed water pump is communicated with the economizer (12) through the economizer inlet header (11).
7. The high-efficiency supercritical carbon dioxide boiler with two working fluids according to claim 1, characterized in that the water outlet of the external steam drum (14) is connected with a boiler drain pipe.
8. The high-efficiency supercritical carbon dioxide boiler with two working fluids according to claim 1, characterized in that the outlet of the tail vertical flue is connected with a chimney.
9. The high-efficiency supercritical carbon dioxide boiler with two working fluids according to claim 1, characterized in that the steam outlet of the external back pressure machine (16) is communicated with an industrial steam supply pipeline.
10. The high-efficiency supercritical carbon dioxide boiler with two working fluids according to claim 1, characterized in that the water wall (13) adopts a spiral structure.
CN202120170410.6U 2021-01-21 2021-01-21 High-efficient supercritical carbon dioxide boiler with two working mediums Active CN214307058U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202120170410.6U CN214307058U (en) 2021-01-21 2021-01-21 High-efficient supercritical carbon dioxide boiler with two working mediums

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202120170410.6U CN214307058U (en) 2021-01-21 2021-01-21 High-efficient supercritical carbon dioxide boiler with two working mediums

Publications (1)

Publication Number Publication Date
CN214307058U true CN214307058U (en) 2021-09-28

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