Method for stripping gas washing water

A technology of coal gas washing and water vapor, which is applied in the field of coal gasification technology, can solve the problems of sulfide stress corrosion cracking and chloride stress corrosion cracking, etc., and achieve the effects of alleviating stress corrosion, reducing material costs and prolonging service life

Active Publication Date: 2013-05-15
WUHUAN ENG
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  • Abstract
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Problems solved by technology

[0004] 1) Sulfide stress corrosion cracking;

Method used

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  • Method for stripping gas washing water

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Embodiment

[0019] Embodiment: Taking coal gasification washing discharge water stripping as an example, refer to figure 1 , the gas washing water is neutralized with 20wt% dilute nitric acid to 6.5-7.0, then enters the stripping tower 1, contacts with the low-pressure steam countercurrently, and dissolves the H dissolved in the washing discharge water 2 S, CO 2 and NH 3 After the gas is stripped to the gas phase, the gas from the top of the stripping tower 1 is cooled to 80-100°C through the stripping gas cooler 2, and then the gas-liquid separation is carried out through the acid gas separation tank 4, and the separated liquid is passed through the stripping tower The reflux pump 3 returns to the stripper 1, and the separated acid gas is sent to the torch; the sewage discharged from the bottom and top of the stripper 1 is cooled to 40-50°C by the sewage cooler 5, and then pressurized by the sewage pump 6 Sent to sewage treatment plant. Wherein, the plate material of the stripping tow...

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Abstract

The invention discloses a method for stripping gas washing water, which solves the problems caused by the existing method for stripping the gas washing water, such that equipment and pipes are easy to corrode, and the production and investment of the equipment are high. The technical scheme comprises the following steps of: neutralizing the gas washing water, and then putting in a stripping tower to contact the low-pressure steal counter flow; stripping the gases, such as H2S, CO2 and NH3, dissolved in the washing and discharging water to gas-phases; cooling the gases coming from the top of the stripping tower to 80-100 DEG C via a stripping gas cooler; separating the gas from liquid via an acidic gas separating tank; returning the separated liquid to the stripping tower via a return pump of the stripping tower; conveying the acidic gas to a torch; cooling the wastewater produced by stripping to 40-50 DEG C via a wastewater cooler; and conveying the wastewater to a wastewater processing device after a drainage pump is pressurized. The method for stripping the gas washing water disclosed by the invention has simple processes, can effectively resolve the corrosion of the stripping tower, relative equipment and pipes, can prolong the service life of the equipment, and can reduce the investment cost of the equipment.

Description

technical field [0001] The invention relates to a coal gasification process, in particular to a coal gas washing water stripping method. Background technique [0002] The coal gas produced by the coal gasification process contains a small amount of HCl and other halogen compound gases. In order to prevent the corrosion of equipment and pipelines when HCl is condensed, an alkali cleaning process is installed in the coal gasification device to remove HCl and other acidic gases. A common practice is to add a small amount of NaOH solution to the washing water to control the pH of the washing water between 7.5 and 8.0. [0003] Therefore, the pH value of the washing water discharged from the washing process is 7.5-8.0, and some CO is dissolved 2 、H 2 S, NH 3 Such as gas, the washing water should be stripped to add acidic components before discharge. In order to ensure the stripping effect, it is usually necessary to add dilute hydrochloric acid (15wt%) to neutralize the washi...

Claims

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Application Information

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IPC IPC(8): C02F1/04
Inventor 游伟徐建民周超刘丙富赵涛夏吴
Owner WUHUAN ENG
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