Coke oven raw gas and waste gas waste heat recycling system

Abstract

The invention discloses a coke oven raw gas and waste gas waste heat recycling system. The coke oven raw gas and waste gas waste heat recycling system comprises a coke oven, a high-temperature waste heat boiler, a waste gas purifying device, a steam turbine, an oil-gas separator, a low-temperature waste heat boiler, a coal gas cooler, an oil-water separator and a low-temperature waste heat recycling device. According to the scheme adopted by the invention, the high-temperature waste heat boiler, the low-temperature waste heat boiler and the low-temperature waste heat recycling device are simultaneously arranged, so that raw gas high-temperature sensible heat, heavy tar low-temperature waste heat and 60-100-DEG C raw gas low-temperature waste heat are effectively recycled and reutilized, and a great deal of heavy tar and light tar in raw gas further can be recycled, and therefore, profits are created and the yield is increased for enterprises, and economic and social benefits are very good; raw gas is further conveyed into a first smoke gas pipeline to perform heat exchange with coke oven waste gas in a second smoke gas pipeline, so that high-temperature sensible heat in the raw gasis partially recycled and reutilized; and in a coke oven waste gas denitration process, a heater does not need to additionally arrange, so that coke oven waste gas investment and treatment cost is greatly reduced, and energy conservation and consumption reduction of coking enterprises are facilitated.

Description

technical field [0001] The invention relates to the technical field of coke oven waste heat recovery, in particular to a coke oven raw gas and waste gas waste heat recovery and reuse system. Background technique [0002] A coke oven contains dozens of carbonization chambers (such as 56). These carbonization chambers produce a large amount of raw coal gas at 600-800°C during operation, which has high heat energy. The raw coal gas generated during the carbonization process in the carbonization chamber is collected into the top space of the carbonization chamber, and enters the gas collecting pipe through the riser pipe and the bridge pipe. The raw coal gas is directly sprayed with ammonia water in the bridge pipe and cooled to about 85°C. The cooled raw coal gas contains a large amount of tar And other components, the temperature is still high, and it needs to go through a variety of treatments to become coke oven gas, which makes the cost of coke oven gas to natural gas (SNG,...

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Problems solved by technology

[0002] A coke oven contains dozens of carbonization chambers (such as 56). These carbonization chambers produce a large amount of raw coal gas at 600-800°C during operation, which has high heat energy. The raw coal gas generated during the carbonization process in the carbonization chamber is collected into the top space of the carbonization chamber, and enters the gas collecting pipe through the riser pipe and the bridge pipe. The raw coal gas is directly sprayed with ammonia water in the bridge pipe and cooled to about 85°C. The cooled raw coal gas contains a large amount of tar and other components, the temperature is still high, and it needs to undergo various treatments to become coke oven gas, resulting in high cost of coke oven gas to natural gas (SNG, CNG, LNG), and natural gas products lack obvious competitiveness

This process not only wastes a large amount of thermal energy sensible heat in raw gas, but also wastes light tar, heavy tar and other components in raw gas with high economic value.

[0003] While the coke oven produces a large amount of raw coal gas, it also produces a large amount of coke oven exhaust gas. After the exhaust gas passes through the exhaust gas switch, its temperature is about 220-280 ° C, and the most mature catalytic reduction (SCR) catalyst The applicable temperature is 300-400°C. If the coke oven exhaust gas is directly passed into the denitrification tower, the low temperature will lead to low denitrification efficiency of the catalytic reduction method and cannot meet the requirements of flue gas emission. Therefore, coking enterprises usually install additional heaters for coke oven exhaust gas After heating, it is sent to the SCR denitrification tower after being heated to above 300°C. During the denitrification process, not only the heat energy in the coke oven exhaust gas cannot be recovered, but additional heat energy must be added to the coke oven exhaust gas to meet the denitrification requirements, which increases the coking enterprise. Coke oven waste gas investment and treatment costs

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