New method for performing preliminary condensation refrigeration on coking raw gas

Abstract

The invention aims at providing a new method for performing preliminary condensation refrigeration on coking raw gas. The method mainly consists of: raw gas direct cooling and waste heat utilization, gas indirect cooling and extraction dephenolization, and residual ammonia water recovery. The waste heat of the coking raw gas is utilized to refrigerate circulating water, and an enclosed air-cooling technology is employed for reducing cooling load at the upper segment of a primary cooler of a gas primary horizontal pipe by about 55-80%, wherein refrigeration of the circulating water does not need live steam and combustion gas; the recovered residual ammonia water has a relatively low oil content, and phenol in the residual ammonia water can be extracted and recovered; and by increasing the injection suction of the high-pressure ammonia water in a coke-oven bridge pipe, the smokeless coaling effect of a coke oven is improved, and also the horizontal pipe primary cooler is not blocked by coal dust, so that the horizontal pipe primary cooler is prolonged in clean period, and environmental pollution is reduced. In short, the new method is beneficial to energy saving and emission reduction of coking industry and improvement of production environment, and helps to substantially reduce coking production cost and improve economical benefit.

Description

technical field [0001] The present invention relates to a new method involving waste heat utilization of coking raw gas, recovery of surplus ammonia water and preliminary condensation cooling, belongs to the field of energy saving, water saving and environmental protection, and is mainly suitable for preliminary condensation cooling of coking raw gas in the coking industry. Background technique [0002] Since the early 1990s, my country's coking enterprises have mostly adopted the method of horizontal tube intercooling, and divided the horizontal tube primary cooler into upper and lower sections to initially condense and cool the raw coking gas. In the primary cooler, the two-stage cooling water and gas adopt a cross-flow method, and the heat exchange and cooling efficiency is high. At the same time, in order to avoid blockage of the primary cooler tubes by coal powder and naphthalene crystals entrained by raw gas, the gas condensate in the upper and lower segments is used t...

AI Technical Summary

Problems solved by technology

Nevertheless, there are still many deficiencies in this traditional method: First, the latent heat of a large amount of water vapor in the raw gas is not utilized, but is taken out by a large amount of circulating cooling water in the upper section of the gas primary cooler, and then discharged through the cooling tower into the atmosphere, resulting in a large consumption of water for the initial cooling of the gas; second, in the lower section of the primary cooler, in order to cool the gas below 21°C, a large amount of steam or gas refrigeration is required, resulting in high energy consumption for the initial cooling of the gas; Yes, raw gas entrains more coal powder, and the primary cooler is frequently blocked, which not only affects the gas primary cooling effect, but also causes serious environmental pollution due to frequent cleaning, especially to improve the effect of smokeless coal charging, the suction of high-pressure ammonia injection is relatively large This problem is more prominent; Fourth, the remaining ammonia water produced by the initial cooling of the gas contains more tar, which causes serious blockage of related equipment in the subsequent treatment system.

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