Full-temperature-process pressure swing adsorption purification method for benzene removal and naphthalene removal of coke oven gas

A technology of pressure swing adsorption and coke oven gas, which is applied in combustible gas purification, combustible gas purification/transformation, removal of gas pollutants, etc., can solve the problem of large consumption of regeneration gas and heat, difficulty in matching adsorption time, and reduction of fuel heat Value and other issues, to avoid the negative impact of desulfurization and deammonization load and efficiency, reduce energy consumption and other impurity interference, and reduce the treatment capacity

Active Publication Date: 2016-08-03
SICHUAN TECHAIRS
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the huge amount of gas treatment, generally tens of thousands of cubic meters per hour, the regeneration temperature must be increased, and an inert heat carrier that does not react with BTEX, naphthalene, tar, and other impurities in the gas, such as ammonia and sulfide, must be selected. A large amount of regeneration gas and heat, especially when elemental sulfur is precipitated on the surface of the adsorbent in the presence of hydrogen sulfide (H2S), requires a high temperature of over 400 ° C, and when the general heat carrier nitrogen (N2) is selected, the regeneration gas heat Nitrogen needs to be cooled to purify and recover benzene-naphthalene, or mix with coke oven gas entering the fuel pipeline network after cooling down, which greatly reduces the calorific value of fuel and cannot recover benzene-naphthalene
At the same time, since the regeneration heating requires sufficient time, it is difficult to match the short adsorption time, making it difficult to effectively realize the cyclic process of TSA adsorption and regeneration.

Method used

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  • Full-temperature-process pressure swing adsorption purification method for benzene removal and naphthalene removal of coke oven gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] like figure 1 As shown, a full-temperature PSA purification method for removing benzene and naphthalene from coke oven gas, the following operations are performed in sequence:

[0043] (1) Ammonia washing process:

[0044] Use the circulating ammonia water pump to send the circulating ammonia water with a temperature of about 70°C and a pressure of 2.3-2.6MPa to the gas collecting pipe for spraying, and reduce the temperature of the high-temperature raw material coke oven gas (hereinafter referred to as "coal gas") from 650-800°C to 80 ~100°C; with the cooling of the gas, 65-70% of coal tar and part of benzene in the gas are condensed, and the tar is about 80-120g / m 3 Reduced to about 30~35g / m 3 , benzene from 30 to 45g / m 3 Reduced to 3.5 ~ 4g / m 3 Below, naphthalene ranges from 8 to 12g / m 3 down to 1g / m 3 the following.

[0045] (2) Medium temperature pressure swing adsorption concentration process:

[0046] Alternate cycle operation is carried out in the medium-t...

Embodiment 2

[0066] According to the basic process of Example 1, the temperature of the high-temperature gas after ammonia washing is 60-80°C, the pressure is 2.6-2.8MPa, 70-75% of coal tar and part of benzene in the gas are condensed, and the tar is from about 80-120g / m 3 Reduced to about 35~40g / m 3 , benzene from 30 to 45g / m 3 Reduced to 3~3.5g / m 3 Below, naphthalene ranges from 8 to 12g / m 3 down to 0.8g / m 3 the following. The coal gas enters the medium temperature pressure swing adsorption concentration process under the corresponding operating conditions for adsorption concentration, debenzene and naphthalene removal, etc. At this time, the intermediate gas flows out from the top of the adsorption tower, and the tar contained therein drops to 20-30 mg / m 3 , benzene dropped to 20~30mg / m 3 , naphthalene reduced to 0.1g / m 3 Next, the intermediate gas is purified in the next step; the concentrated gas with a benzene and naphthalene concentration of about 55-60% is obtained by deso...

Embodiment 3

[0068]On the basis of Example 2, the desorbed gas (concentrated gas) obtained from the medium temperature pressure swing adsorption concentration process directly enters the debenzene section, and a tower process is adopted to remove benzene by distillation, washing oil (rich oil) and concentrated gas respectively. It enters the middle part of the debenzene tower at 170-190 ° C, and the enriched light benzene and rich oil flow out from the top of the tower. Extract the refined heavy benzene at 120-130°C from the middle layer of the feed inlet (16 layers), and extract the enriched naphthalene oil at 150-160°C between the lower layer of the refined heavy benzene layer and the upper part of the oil-rich feed layer, and enter the final cooling and washing process. Oil and naphthalene separation tank, the product naphthalene and lean oil, the lean oil and the lean oil flowing out from the bottom of the debenzene tower enter the lean oil tank, after heat exchange and oil washing rege...

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Abstract

The invention discloses a full-temperature-process pressure swing adsorption purification method for benzene removal and naphthalene removal of coke oven gas and relates to the technical field of hydrogen manufacturing and pressure swing adsorption gas separation.The method includes the procedures of ammonia washing, desulfuration, deamination, fine benzene removal and fine naphthalene removal.A medium-temperature pressure swing adsorption concentration procedure needs to be conducted after ammonia washing and before desulfuration, the multi-tower series or parallel process is adopted for the medium-temperature pressure swing adsorption concentration procedure, alternate cyclic operation is conducted, the operation temperature ranges from 60 DEG C to 120 DEG C, vacuumizing desorption is conducted, generated desorbed gas sequentially gets into a naphthalene washing procedure and a benzene washing procedure and then flows back to the medium-temperature pressure swing adsorption concentration procedure, generated medium gas sequentially gets into the procedures of desulfuration, deamination, fine benzene removal and fine naphthalene removal, and then product gas is obtained.Efficiency is high, an adsorbent of a medium-temperature pressure swing adsorption tower is long in service life, the operating energy consumption and cost of a device are low, the phenomenon that the adsorption tower is easily blocked by benzene and naphthalene is avoided, the naphthalene and benzene removal precision is high, the yield of the product and byproducts is high, and poisoning of a desulfuration and deamination catalyst is avoided.

Description

technical field [0001] The invention belongs to the field of coke oven gas purification, and more specifically relates to a full temperature range pressure swing adsorption purification method for removing benzene and naphthalene from coke oven gas. Background technique [0002] Coke oven gas (hereinafter referred to as "coal gas") is the gaseous escape after coal coking, and is an important gas fuel with medium and high calorific value. Its components are mainly H 2 (30-50%), CH 4 (30-40%), CO (6-15%) and a certain amount of tar vapor, benzene vapor, naphthalene vapor, etc., can be used not only for steel production, but also for urban residents, and can also be used as raw materials for the production of synthetic ammonia, Methanol, hydrogen production, natural gas production, etc. Before the comprehensive utilization of coal gas, a large number of impurities need to be removed, mainly including tar, naphthalene, hydrogen sulfide (H 2 S), benzene, hydrocyanic acid (HCN)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/00C10K1/12C10K1/32C10K1/34
CPCC10K1/002C10K1/003C10K1/004C10K1/121C10K1/32C10K1/34
Inventor 刘开莉蔡跃明陈运钟雨明
Owner SICHUAN TECHAIRS
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