Coking gas desulfuration-regeneration integrated column having multilayer spray structure

Abstract

A coking gas desulfuration-regeneration integrated column having multilayer spray structure. In the invention, a conventional desulfuration technology device in the prior art is changed into an integrated column-type structure design in which a regenerated tail gas washing unit, a regenerating unit, a desulfuration unit and a desulfurated rich solution storage and reaction unit are optimized. In addition, in the four layers of filling material supports in the desulfuration unit are provided with corresponding coil-type re-cooling apparatuses and a two-layered spray structure is arranged at the upper part and the middle part of the desulfuration unit, so that the content of hydrogen sulfide in desulfurated coking gas is low. The regenerated tail gas washing unit installed on the top of the regenerating unit, wherein a tail gas washing process includes two parts: (1) feeding fresh water or a desulfuration solution, which satisfies circulation water equilibrium, to the upper part of interior of the tail gas washing unit; and (2) performing tail gas desulfuration to sprayed fresh water or desulfuration solution to form a washing solution, feeding the washing solution to the upper part of interior of the tail gas washing unit again through a circulation pump, jetting the fresh water or the desulfuration solution or jetting the washing solution by a high-pressure atomization spray gun to perform double tail gas desulfuration washing. By such a process, the operation of integrated column-type desulfuration and regeneration of coking gas is achieved.

Description

technical field [0001] The invention belongs to the technical field of coking desulfurization in coal chemical industry, and in particular relates to a coking gas desulfurization and regeneration integrated tower with a multi-layer spray structure. Background technique [0002] At present, the existing iron and steel enterprises will implement more stringent emission limits of air pollutants, and the coking production enterprises in the iron and steel enterprises urgently need to find suitable, efficient and economical emission reduction treatment technologies. Because coking gas contains hydrogen sulfide and hydrogen cyanide, it not only seriously pollutes the atmospheric environment, but also when coking gas is used as metallurgical fuel in iron and steel enterprises, harmful substances such as hydrogen sulfide seriously affect the quality of steel. [0003] The traditional desulfurization process equipment for coking gas is relatively complicated, such as figure 2 As...

AI Technical Summary

Problems solved by technology

Because coking gas contains hydrogen sulfide and hydrogen cyanide, it not only seriously pollutes the atmospheric environment, but also when coking gas is used as metallurgical fuel in iron and steel enterprises, harmful substances such as hydrogen sulfide seriously affect the quality of steel

[0003] The traditional desulfurization process equipment for coking gas is relatively complicated, such as figure 2 As shown, it is mainly composed of desulfurization tower, regeneration tower, reaction tank, etc. The process flow is that the coarse coking gas from the previous process enters the lower part of the desulfurization tower through the gas inlet, and the desulfurization lean liquid sprayed from the top of the tower is countercurrently contacted, washed and coked The hydrogen sulfide in the gas and the net coking gas from which the hydrogen sulfide has been removed are sent to the next process from the gas outlet on the top side of the tower; In the reaction tank, the catalyst solvent is replenished dropwise and then pumped into the regeneration tower by the rich liquid circulation pump for regeneration; the compressed air from the injector of the air compressor station passes through the compressed air inlet and the desulfurization rich liquid is combined with the desulfurization rich liquid inlet of the regeneration tower at the lower part of the regeneration tower. The desulfurization rich liquid flows into the regeneration tower to oxidize and regenerate the desulfurization rich liquid; the regenerated desulfurization lean liquid flows from the outlet of the desulfurization lean liquid at the upper part of the regeneration tower through the liquid level regulator and the external connecting pipeline to the spray structure at the middle and upper part of the desulfurization tower Spray desulfurization; the sulfur foam flotation at the top of the regeneration tower flows out from the sulfur foam outlet and sent to the next process

[0004] Although the traditional desulfurization process of coking gas can reduce environmental pollution, it also has the following shortcomings: First, the structure is complex, and the entire desulfurization system has a large number of large-scale equipment, such as desulfurization towers, regeneration towers, reaction tanks, etc., occupying an area of Large, wide and long-distance pipelines increase equipment investment costs; second, the process is complex, the regeneration tower uses compressed air to oxidize and regenerate desulfurized rich liquid, so a high-pressure air station must be established, which also increases equipment investment costs The third is that due to the large size of equipment, many types of models, and long installation distances of pipelines, various losses in the desulfurization operation process increase, such as heat loss, catalyst loss, etc., which will inevitably lead to a decrease in desulfurization efficiency, incomplete desulfurization effect, and increased desulfurization. Reduce production and operation costs and reduce energy efficiency

In particular, the regenerated tail gas is directly discharged into the atmosphere from the regenerated tail gas discharge port at the top of the regeneration tower without any treatment, causing serious secondary pollution and causing adverse effects on the environment

In addition, the coal quality of the raw coal used in the current coking gas has a tendency to contain high sulfur content, which will inevitably lead to an increase in the sulfur content in the coking gas. Therefore, it is urgent to use efficient desulfurization regeneration equipment in the desulfurization process of coking gas

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