Fume-fume hot pipe heater exchanger for fume desulphurization in heat-engine plant

Abstract

The invention relates to a flue gas-flue gas heat pipe heat exchanger for flue gas desulfurization in a thermal power plant, which is composed of a heat pipe, a tube plate, a lower shell and an upper shell. The two sides of the lower shell are respectively equipped with hot flue gas inlet and hot flue gas outlet, and the two sides of the upper shell are respectively equipped with cold flue gas inlet and cold flue gas outlet. The feature is that the heat pipe arranged in the lower casing is made of ordinary carbon steel or Corten steel with low low-temperature corrosion resistance requirements and low price, and the heat pipe arranged in the upper casing is made of relatively low-temperature corrosion-resistant steel. It is made of high-end and high-priced ND steel or corrosion-resistant stainless steel. The two heat pipes are welded, and the welding point is located at the connection between the lower shell and the upper shell. The invention has the advantages of high utilization rate of heat energy, basically no leakage, low operating energy consumption, small size, low price, and simple and convenient maintenance.

Description

technical field [0001] The invention relates to a flue gas-flue gas heat pipe heat exchanger for flue gas desulfurization in thermal power plants, and belongs to the technical field of flue gas desulfurization, environmental protection and energy saving in thermal power plants. Background technique [0002] At present, flue gas desulfurization of thermal power units in thermal power plants is an inevitable requirement. The temperature of the flue gas discharged from the boiler is generally around 130°C. In the wet desulfurization process, the temperature must be lowered from 130°C to about 90°C before desulfurization can be performed efficiently. The temperature of the flue gas flowing out of the desulfurization tower is about 40~ 50°C, considering the needs of environmental protection and anti-corrosion of tail equipment, it is necessary to heat the outlet smoke temperature from 40-50°C to 60-80°C. [0003] To cool down from 130°C to about 90°C, two methods are currently u...

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Problems solved by technology

[0003] From 130°C to about 90°C, two methods are currently used to cool the temperature, the rotary flue gas-flue gas heat exchanger and water spraying, and the temperature is raised from 40-50°C to about 60-80°C. At present, the rotary flue gas-flue gas heat exchanger is mostly used There are two types of gas heat exchanger and steam-flue gas heat exchanger. Among them, the heat exchange surface of the rotary flue gas-flue gas heat exchanger is made of corrosion-resistant materials, which covers a large area, high equipment price and heavy maintenance workload

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