A kind of regeneration method of TSA tower in coke oven gas making lng device

Abstract

The invention discloses a method for regenerating a TSA tower in a coke oven gas-to-LNG device, which comprises the following steps: transporting the coke oven gas to a gas cabinet for homogenization; compressing the homogenized coke oven gas for the first time, and entering into the The pre-purification device performs pretreatment; the pretreated coke oven gas is compressed for the second time and enters the fine desulfurization device for fine desulfurization; the coke oven gas after fine desulfurization is sent to the methanation device; the synthetic methane mixed gas enters the drying After the mercury removal device removes water and mercury, it is transported to the liquefaction device to separate the LNG product and nitrogen and hydrogen tail gas. Part of the nitrogen and hydrogen tail gas is decompressed and returned to the gas cabinet, and part of the nitrogen and hydrogen tail gas enters the first TSA naphthalene removal tower; The gas in a TSA denaphthalene removal tower is heated to 200°C through a heater, and the heated gas enters the second TSA denaphthalene removal tower for thermal blowing regeneration of the second TSA denaphthalene removal tower; it will enter the first TSA denaphthalene removal tower and The nitrogen and hydrogen tail gas after the second TSA denaphthalene removal tower is transported to the pipeline of the primary cooler of the coke oven gas purification system for recovery and repurification.

Description

technical field [0001] The invention belongs to the technical field of deep processing and utilization of coke oven gas, and in particular relates to a regeneration method of a TSA tower in a coke oven gas LNG device. Background technique [0002] There are generally three TSA naphthalene removal towers in each set of coke oven gas to LNG plant, one for adsorption, one for regeneration, and one for standby after cold blowing. The regeneration process of the adsorption tower includes hot blowing regeneration and cold blowing. Blowing and cooling, the coke oven gas after adsorption and removal of naphthalene is now used as the hot blowing regeneration gas of the adsorption tower and the cold blowing gas for the adsorption and adsorption packing in the tower after regeneration, and the coke oven gas after adsorption and removal of naphthalene is used as the hot blowing regeneration gas and There are several problems in cold blowing: 1) The coke oven gas after adsorption and rem...

AI Technical Summary

Problems solved by technology

[0002] There are generally three TSA naphthalene removal towers in each set of coke oven gas to LNG plant, one for adsorption, one for regeneration, and one for standby after cold blowing. The regeneration process of the adsorption tower includes hot blowing regeneration and cold blowing. Blowing and cooling, the coke oven gas after adsorption and removal of naphthalene is now used as the hot blowing regeneration gas of the adsorption tower and the cold blowing gas for the adsorption and adsorption packing in the tower after regeneration, and the coke oven gas after adsorption and removal of naphthalene is used as the hot blowing regeneration gas and There are several problems in cold blowing: 1) The coke oven gas after adsorption and removal of naphthalene also contains impurities such as hydrogen sulfide and organic sulfur. During regeneration, elemental sulfur will be generated on the adsorption packing, which will block the micropores of the adsorption packing and make the adsorption packing The performance is irreversibly deteriorated, which shortens the life of the adsorption packing; 2) The temperature of coke oven gas after adsorption and removal of naphthalene is 35-40°C. Due to the high temperature, the cooling efficiency of cold blowing is poor, and a large amount of cold blowing gas is required, and the power cost is high; 3 ) When the adsorption performance of the adsorption filler deteriorates to a certain extent, it will cause naphthalene through the tower, resulting in an increase in the naphthalene content of the outlet gas. At this time, the gas is used for regeneration and cold blowing, and the adsorption performance of the adsorption filler will show a trend of accelerated deterioration. Tower switching operations will also be more frequent

Images