Riser raw gas disturbance method and device based on coke dry quenching circulating gas

Abstract

The invention discloses a riser raw gas disturbance method and device based on coke dry quenching circulating gas, and belongs to the technical field of coke oven raw gas waste heat recovery. According to the riser raw gas disturbance method based on the coke dry quenching circulating gas, a rotary air inlet hole inclining towards one side is formed in a riser base of a riser heat exchanger, gas is taken from a circulating fan rear main pipe of a coke dry quenching circulating system, the gas is connected into the rotary air inlet hole of the riser base through a connecting pipeline, and cokedry quenching circulating gas is utilized to form rotary disturbance gas flow in the riser base, so that raw gas in the riser heat exchanger forms rotary ascending motion. According to the invention,under the condition that the service life and the heat exchange channel of a riser heat exchanger are not affected, raw gas in the riser heat exchanger is made to rotate and ascend, so that disturbance of the raw gas is enhanced, convective heat exchange between the raw gas and the riser heat exchanger is enhanced, the surface temperature of the inner barrel of the riser heat exchanger can be increased, and tar in the raw gas is prevented from condensing.

Description

technical field [0001] The invention relates to the field of waste heat recovery of coke oven raw gas, and more specifically relates to a method and device for disturbing raw gas in a rising pipe based on CDQ circulating gas. Background technique [0002] The raw gas coming out of the coke oven coking chamber and entering the riser heat exchanger is about 800°C. Coking enterprises generally adopt the traditional ammonia water spraying method for cooling, resulting in a large amount of waste heat resources that cannot be utilized. [0003] With the development of waste heat recovery technology, many enterprises currently use riser heat exchange devices to recover heat, produce low-pressure and medium-pressure saturated steam, and recover the sensible heat of raw gas. In practical application, we found that the heat of the water-jacketed riser heat exchanger mainly comes from the thermal radiation of high-temperature gas, and there is a problem of uneven heat distribution. Th...

AI Technical Summary

Problems solved by technology

At present, there are mainly two ways to generate raw gas disturbance: one is to add fins on the inner wall of the rising tube. This technology is to weld some metal fins on the inner wall of the rising tube. However, there are some problems in this technology: since the fins are welded on the inner cylinder, after the fins are added, the existing spraying technology can no longer spray the inner wall of the riser pipe, only after spraying. Welding the fins on the inner wall not only destroys the integrity of the original spray coating, but also makes it extremely difficult to weld the fins on the coating. After the coating is damaged, the temperature resistance of the weld material will be greatly reduced, increasing The possibility of burning out and deforming the inner tube will seriously affect the safety of the riser tube and the life of the riser tube heat exchanger

The other is to install a rotating blade in the riser, and drive the rotating blade through the flow of raw gas to increase the disturbance of the raw gas, such as "a coke oven riser" disclosed in Chinese Patent No. ZL201520481367.X and Chinese Patent No. ZL201610814369 .5 "A System and Method for Cleaning Graphite in the Coke Oven Riser and Recovering the Waste Heat of Raw Gas", etc., etc., but with this structure, the inner channel of the riser is occupied by the rotating blades, which will seriously affect the channel of the raw gas, resulting in waste gas. The gas channel is blocked, and the rotating blades have been operating in high-temperature raw gas for a long time, and the service life is not long

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