A combined heating system of gas-steam combined cycle and decarbonization system

Abstract

The invention belongs to the technical field of heat supply and electric power generation, and particularly relates to a gas-steam combined cycle and carbon removal system combined heat supply system.The gas-steam combined cycle and carbon removal system combined heat supply system comprises a gas-steam combined cycle unit, a carbon dioxide capture unit and a user heat supply network unit which are connected mutually, wherein a waste heat boiler in the gas-steam combined cycle unit is connected to a gas compressor and an air blower by a lower temperature flue gas heat exchanger; the carbon dioxide capture unit comprises the air blower, an absorption tower, a barren-rich liquor heat exchanger, a resolving tower, a reboiler, a carbon dioxide separator and a carbon dioxide compression unit;the carbon dioxide compression unit releases carbon dioxide through a first heat exchanger; the reboiler is connected to a press cylinder in a steam turbine by a second heat exchanger and is connectedto the waste heat boiler by a third heat exchanger; the user heat supply network unit is used for connecting a heat supply network loop and a heat supply network user through a fourth heat exchanger;and the heat supply network loop is formed by connecting the fourth heat exchanger, the low-temperature flue gas heat exchanger, the third heat exchanger, the first heat exchanger and the second heatexchanger in sequence from head to tail.

Description

technical field [0001] The invention belongs to the technical field of heat supply and power generation, and in particular relates to a heat supply system combined with a gas-steam combined cycle and a decarbonization system. Background technique [0002] In recent years, the greenhouse effect has become one of the serious global environmental problems, posing a serious threat to the global ecological environment and human life. Carbon dioxide plays an important role among greenhouse gases. The use of gas-steam combined cycle heat and power cogeneration has the advantages of high overall power plant efficiency, low environmental pollution, and good peak-shaving capability. The development of gas-steam combined cycle heat and power cogeneration systems has been paid more and more attention. [0003] Carbon capture technology is one of the important ways to reduce carbon dioxide emissions in coal-fired power plants. Among them, the method of using diethanolamine solution (MEA...

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Problems solved by technology

[0005] In order to solve the problem that the large amount of steam extracted during the decarbonization process of the gas-steam combined cycle heating unit affects the operation of the steam turbine and wastes a lot of heat, the present invention proposes a combined heating system of the gas-steam combined cycle and decarbonization system, including interconnected : gas-steam combined cycle unit, carbon dioxide capture unit and user heating network unit; the compressor, combustion chamber, turbine and waste heat boiler contained in the gas-steam combined cycle unit are connected in sequence through pipelines, and the compressor, turbine 1. The steam turbine and the generator are coaxially arranged in series. The steam turbine includes a high-pressure cylinder, a medium-pressure cylinder, and a low-pressure cylinder respectively connected to the waste heat boiler, and the waste heat boiler is connected to the compressor and the blower respectively through a low-temperature flue gas heat exchanger; the carbon dioxide capture unit It includes a blower, an absorption tower, a lean-rich liquid heat exchanger, a desorption tower, and a reboiler connected in sequence, and the top of the desorption tower is connected with a carbon dioxide separator and a carbon dioxide compression unit in sequence; the carbon dioxide compression unit releases carbon dioxide through the first heat exchanger , the reboiler is connected to the medium-pressure cylinder of the steam turbine through the second heat exchanger, and the reboiler is connected to the waste heat boiler through the third heat exchanger; , low-temperature flue gas heat exchanger, the third heat exchanger, the first heat exchanger, and the second heat exchanger are connected end to end in sequence to form a heat network loop and connect to heat network users

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