Long-service-life waste heat recovery apparatus for coke oven waste flue gas

Abstract

The invention provides a long-service-life waste heat recovery apparatus for coke oven waste flue gas. The apparatus includes a flue gas duct (1) and a heat exchange coil (2); the flue gas duct (1) includes a plurality of corrugated disks (15) and a spiral heating pipe (16), and an inner cylinder wall (11), a phase-change material layer (12), a heat-insulating layer (13) and an outer cylinder wall (14), which are successively arranged from interior to exterior; the inner cylinder wall (11) is a corrugated pipe. The tops and the bottoms of the inner cylinder wall (11) and the outer cylinder wall (14) are welded to each other through the corrugated disks (15); the spiral heating pipe (16) is arranged between the inner cylinder wall (11) and the phase-change material layer (12); the heat exchange coil (2) is arranged in the phase-change material layer (12); a medium inlet (21) is arranged on the bottom and a medium outlet (22) is arranged on the top of the heat exchange coil (2). Through the corrugated disks and the corrugated pipe as the top wall and the inner wall in the waste heat recovery apparatus, and meanwhile the heating pipe is employed for removing coke, the waste heat recovery apparatus is greatly prolonged in service life; in addition, the apparatus has high heat exchange efficiency and good effects.

Description

technical field [0001] The invention belongs to the field of coke oven equipment, in particular to a coke oven flue exhaust gas waste heat recovery device with long service life. Background technique [0002] The coke oven can perform high-temperature dry distillation on coal and efficiently convert it into coke, coke oven gas, coal tar, crude benzene and other products. It is an efficient energy conversion kiln. In coke oven expenditure heat, 650°C-700°C raw coal gas takes up about 36% of the heat, which has a very high recycling value. At present, the industrial application of raw gas is usually realized by cooling treatment process. The traditional process is: spray a large amount of circulating ammonia water at 70°C-75°C on the high-temperature raw gas to cool it down, and realize waste heat recovery. However, this will lead to high-temperature raw gas. Heat is wasted by extensive evaporation of the circulating ammonia. [0003] In the 1980s, most coking plants in Japa...

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Problems solved by technology

[0005] However, there are more or less problems in the existing coke oven ascending tube raw gas waste heat recovery heat extraction device: the structural design of the heat transfer process is unreasonable, the circulation is not smooth enough, the heat exchange efficiency is low, and the tar sticks on the side wall of the raw gas. Lead to blockage of raw gas channels, coking of heat transfer oil to block heat transfer oil channels, easy to be corroded by media, etc., or unable to effectively solve the problem of thermal expansion and contraction during start-up, shutdown and operation, which makes the above methods difficult to implement successfully, or difficult to achieve satisfactory results Effect

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