High-temperature coke oven raw coke oven gas pipeline cleaning device adopting compressed nitrogen injection

Abstract

The invention relates to a high-temperature coke oven raw coke oven gas pipeline cleaning device adopting compressed nitrogen injection, which comprises a pulse valve, a gas bag, a pulse injection connecting pipeline, a pipeline nozzle and a pulse injection PLC control system, wherein one end of the pulse valve is connected with the pulse injection PLC control system; the other end of the pulse valve is connected with the gas bag; and the gas bag is connected with the pipeline nozzle through the pulse injection connecting pipeline. The device has the benefits that injection medium adopts compressed nitrogen, the compressed nitrogen in the gas bag is instantaneously injected into a cleaned high-temperature raw coke oven gas pipeline, injection gas stream filling a whole pipeline section is formed in the high-temperature raw coke oven gas pipeline, the pulse injection PLC control system can set the injection sequence and the injection time according to production practice, the cleaning of the pipeline is effectively maintained, and the pipeline is prevented from being blocked.

Description

technical field [0001] The invention relates to the field of cleaning technology, in particular to a pulse injection pipeline cleaning device which uses compressed nitrogen to clean high-temperature coke oven raw gas pipelines. Background technique [0002] At present, the high-temperature raw gas produced during coking in domestic coking plants is sprayed with ammonia water to cool down when entering the gas collection pipe through the coke oven rising pipe, and then enters the chemical production workshop. , solid three-phase flow state, it is not easy to have the problem of pipeline blockage, but the method of this process to deal with high-temperature raw gas is to cool the high-temperature raw gas above 700 ℃, and a large amount of heat energy is lost in vain, which is contrary to the national energy-saving policy. In practice It was found that high-temperature coke oven raw gas pipelines are often blocked, especially when the pipeline insulation is not good, the tar is...

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Problems solved by technology

[0002] At present, the high-temperature raw gas produced during coking in domestic coking plants is sprayed with ammonia water to cool down when entering the gas collection pipe through the coke oven rising pipe, and then enters the chemical production workshop. , solid three-phase flow state, it is not easy to have the problem of pipeline blockage, but the method of this process to deal with high-temperature raw gas is to cool the high-temperature raw gas above 700 ℃, and a large amount of heat energy is lost in vain, which is contrary to the national energy-saving policy. In practice It was found that high-temperature coke oven raw gas pipelines are often blocked, especially when the pipeline insulation is not good, the tar is easy to condense on the pipe wall, and the solid particles in the flue gas settle on the surface to form a hardened layer, which eventually leads to the reduction of the flow section of the pipeline , thereby changing the hydraulic characteristics of the entire pipeline system. From the knowledge of fluid mechanics, when the pipeline cross-section decreases, the resistance of the pipeline increases, and the hydraulic characteristic curve will become steeper, while the fan performance curve of the induced draft fan is fixed, so The working point will move to the left, and the final result is that the pressure head of the fan becomes larger, but the flow at the working point decreases. If the influence of the reduction of the pipe section is smaller than that of the flow reduction, it will further lead to a decrease in the flow velocity in the pipe, resulting in a large The settling of solid particles, which further aggravates clogging, has been proven to happen

[0003] At the same time, the high-temperature raw gas pipeline has the following characteristics: (1) The high-temperature raw gas flows in the pipe, and the tar content is as high as 80-120 grams per liter. Since the tar begins to precipitate at about 450 ° C, it is easy to stick to the pipe wall Although the temperature of high-temperature raw gas is above 700°C, the temperature of the pipe wall will be lower than 450°C when the pipeline insulation is not good; (2) The cross-sectional flow velocity of the high-temperature raw gas pipeline is uneven, At the same time, a large amount of flue gas is produced, and the dust content is also high. Even solid particles with larger particle sizes enter the pipeline, and the temperature of the flue gas also fluctuates. Therefore, this inhomogeneity is likely to cause dust particles to settle, tar to precipitate out, and eventually cause pipeline blockage

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