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Natural gas oxygen-enriched combustion and transcritical CO2 circulation coupling power generation system

An oxygen-enriched combustion and power generation system technology, which is applied in the direction of machines/engines, gas turbine devices, steam engine devices, etc., can solve the problems of waste of cold energy and low power generation efficiency, and achieve simple system devices, improve power generation efficiency, and reduce system power consumption Effect

Active Publication Date: 2018-10-09
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The system combines gas turbine power generation, steam Rankine cycle and transcritical CO 2 The cycle is organically combined to make full use of the heat energy in the flue gas and convert it into electrical energy to improve the power generation efficiency of the power plant; oxygen-enriched combustion uses H 2 O, as a combustion temperature neutralizing medium, cancels the flue gas circulation system, and the pressurization process is liquid phase pressurization, which saves compression power consumption, thereby solving the power generation efficiency of the existing technology based on natural gas oxygen-enriched combustion power generation system Technical problems such as low height and waste of cold energy

Method used

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  • Natural gas oxygen-enriched combustion and transcritical CO2 circulation coupling power generation system
  • Natural gas oxygen-enriched combustion and transcritical CO2 circulation coupling power generation system
  • Natural gas oxygen-enriched combustion and transcritical CO2 circulation coupling power generation system

Examples

Experimental program
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Effect test

Embodiment 1

[0052] A combined cycle based on oxyfuel combustion of natural gas and transcritical CO 2 Cyclic coupling power system, its process flow is as follows figure 1 As shown, the specific process is as follows:

[0053] (1) High pressure O 2 / H 2 O combustion gas turbine cycle

[0054] High pressure O with a molar concentration higher than 95% 2 It is mixed with the circulating water separated from the combustion flue gas and the high-pressure natural gas used for combustion, and then enters the combustion chamber 1 for combustion. The combustion pressure is 3.0-9.0 MPa, and the high-temperature and high-pressure flue gas with a temperature of 1250-1400 ° C is generated. The flue gas enters the gas turbine 2 to expand and perform work, the pressure drops to slightly higher than the ambient pressure, and the temperature drops to 600-700°C accordingly. The high-temperature exhaust gas from the gas turbine enters the waste heat boiler 3 to provide heat for the steam Rankine cycle...

Embodiment 2

[0064] A combined cycle based on oxyfuel combustion of natural gas and transcritical CO 2 Cyclic coupling power system, its process flow is as follows figure 2 shown. This embodiment is different from Embodiment 1 in that, on the basis of the dual-pressure no-reheat steam Rankine cycle of the first embodiment 1, steam reheating is added. Compared with the system in Embodiment 1, this system has a reheater A7 and a reheater turbine 23 as additional equipment. The high-pressure superheated steam generated in the high-pressure superheater A6 expands and does work in the high-pressure steam turbine 19. The exhaust steam is first reheated to 550°C by the reheater A7, and then enters the reheater turbine 23 to expand and perform work. The exhaust steam and the low-pressure superheated steam It is mixed in the confluencer 20, and is input into the low-pressure steam turbine 21 to do work, and the exhaust gas of the low-pressure steam turbine 21 enters the condenser 22 to be conden...

Embodiment 3

[0067] A combined cycle based on oxyfuel combustion of natural gas and transcritical CO 2 Cyclic coupling power system, its process flow is as follows image 3 shown. This embodiment differs from Embodiment 1 in that, on the basis of the dual-pressure non-reheating steam Rankine cycle, the intermediate pressure stage is added. Compared with the system in Example 1, the added equipment of this system is a medium pressure pump 24, a medium pressure steam turbine 25, and a confluencer 26. In addition, the high pressure economizer is divided into two, namely, the first stage of high pressure economizer Device A3-1 and high pressure low secondary economizer A3-2. The specific process is as follows: the circulating water first enters the low-pressure pump 16 and is pressurized to a low-pressure pressure of 0.3-0.5MPa, then is preheated by the low-pressure economizer A1, and enters the water separator 17 to be divided into three strands, and one strand enters the low-pressure evapo...

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Abstract

The invention discloses a natural gas oxygen-enriched combustion based combined circulation and transcritical CO2 circulation coupling power generation system. H2O is used for neutralizing the combustion temperature; a smoke gas circulation system is omitted; in addition, circulation water uses liquid phase pressurization; the energy consumption is reduced. The water content in the smoke gas generated through O2 / H2O combustion is high; by using a conventional combined circulation mode, vaporization potential heat of water vapor in the smoke gas is difficult to use. By using the fuel gas-steamcombined circulation and transcritical CO2 circulation coupling mode provided by the invention, the heat energy of the smoke gas can be sufficiently utilized, so that the power generation efficiency of the system is obviously improved. In addition, LNG cold energy can be sequentially used for CO2 capture in smoke gas and work medium condensing in the transcritical CO2 circulation so as to reduce the power consumption of the carbon capture and to ensure the stable operation of the transcritical circulation; the efficient utilization of the cold energy and the obvious improvement of the system power generation efficiency are realized.

Description

technical field [0001] The invention belongs to the field of natural gas power generation, and more specifically relates to a natural gas oxygen-enriched combustion and transcritical CO 2 Cycle-coupled power generation system. Background technique [0002] The efficiency of coal-fired power generation is very low, and the environmental problems caused by it are very serious. It is very important for our country to improve energy utilization efficiency and adjust energy structure. Natural gas power generation emits very little pollutants. At present, the most widely used and most mature power generation method in natural gas power plants is the combined cycle, and its power generation efficiency is above 50%. [0003] In addition, as the greenhouse effect continues to intensify, carbon capture and storage technology (Carbon Capture and Storage, CCS) has received more and more attention. Among them, oxy-fuel combustion is one of the easiest technologies to achieve large-sca...

Claims

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Application Information

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IPC IPC(8): F02C6/18F01K23/10F01K25/10F01K13/00
CPCF01K13/00F01K23/10F01K25/103F02C6/18
Inventor 蔡磊向艳蕾管延文刘文斌韩逸骁梁莹
Owner HUAZHONG UNIV OF SCI & TECH
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