Smoke low-temperature residual heat utilization system with natural gas cooling-heating combined power device and operating method thereof

Abstract

The invention relates to a smoke low-temperature heat utilization system of natural gas cold-heat electric supply and relative operation method. Said system comprises a fuel gas generator, a waste heat boiler, an adsorption refrigerator, and a heating water supply device. Wherein, the heating water supply device comprises a direct gas-water heat exchanger which contains a gondola water faucet whose water channel forms the smoke channel; the smoke outlet of waste heat boiler is connected to the chimney via the direct gas-water heat exchanger; the water inlet and outlet pipes of direct gas-water heat exchanger are serially connected to the pipe of life hot water or water supply; the gas transmission pipe of waste heat boiler has a branch of the reflux gas pipe connecting the burning of fuel gas generator; and the reflux gas pipe is serially connected with a depressurizing device. The invention has simple heat transmission device, lower cost, improved heat efficiency and improved economic benefits.

Description

【Technical field】 [0001] The invention relates to power generation and thermal equipment, and more specifically, the invention relates to a direct heat exchange system for efficiently utilizing low-temperature waste heat from exhaust gas of a natural gas cogeneration device and domestic hot water. 【Background technique】 [0002] With the implementation of the energy strategy of vigorously developing and introducing natural gas resources and optimizing the energy structure in my country, the combined cooling, heating and power system of gas turbines using natural gas as the primary energy is developing rapidly in China. Ordinary gas turbine combined heat, power and cooling system includes gas turbine generator set, waste heat boiler, steam turbine or absorption refrigeration device; the final flue gas discharge temperature of the system is usually around 130°C, and this part of the flue gas still accounts for about 10% of the total heat energy of the fuel. Thermal utilization...

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Problems solved by technology

Although the patent application document mentions that the exhaust gas temperature from the system through the condensing heat exchanger is about 30°C, the document does not fully disclose the technical measures taken to achieve such a low exhaust gas temperature, because if the traditional To achieve the above-mentioned low-temperature smoke exhaust by partition wall heat exchange, a huge amount of steel is required, which has no engineering practical value at all.

[0013] It can also be seen from the above examples that the current combined cooling, heating and power supply equipment system either does not consider the joint supply of domestic hot water supply, or uses the traditional partition wall waste heat boiler to provide hot water, which is bound to be left out due to poor technical and economic performance. abandon

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