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Acidic water treatment method

A treatment method, acidic water technology, applied in water/sewage treatment, multi-stage water/sewage treatment, degassed water/sewage treatment, etc., can solve problems affecting the long-term operation of the conversion device, clogged pipes, and tower top heat exchangers Corrosion and other problems, to achieve the effect of circular economy, reduce equipment selection, and reduce investment

Active Publication Date: 2011-10-26
CHINA PETROLEUM & CHEM CORP +2
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Problems solved by technology

[0003] The existing sour water stripping treatment method contains a large amount of NH in the gas stripped from the top of the stripper 3 、H 2 S, CO 2 , in the subsequent condensation process, it is easy to crystallize ammonium bicarbonate and ammonium sulfate, and the resulting crystals will block the pipeline and condenser, seriously affecting the long-term operation of the conversion device, while the NH at the top of the tower 3 、H 2 S, CO 2 The enrichment of the medium also increases the corrosion of the top heat exchanger, reflux tank and reflux pump

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0018] Such as figure 1 Shown, this sour water treatment method comprises the steps:

[0019] The process condensate from the gas-liquid separator in the transformation process is 295 tons of acidic water, about 310m 3 , its pressure is 55 barg, temperature 95~100 ℃, first enters flash tower 1 to flash, and the pressure of control flash tower is 8 barg. Part H 2 S and CO 2 . The gas phase obtained at the top of the flash tower is sent to the sulfur recovery unit, and the liquid in the bottom of the tower is sent to the nitrogen stripping tower described below.

[0020] The tower bottom liquid after flashing enters from the top of nitrogen stripping tower 2, and nitrogen enters from the bottom of nitrogen stripping tower 2, and the pressure of controlling nitrogen stripping tower is 5barg, and the flow rate of nitrogen is 1800Nm 3 ; Nitro...

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Abstract

The present invention relates to an acidic water treatment method, which is characterized by firstly separating H2S and CO2 with a nitrogen stripping tower, and then sending the tower kettle liquid to a steam stripping tower for extracting NH3. Preferably, in order to save the amount of nitrogen, H2S and CO2 can also be separated by first flash evaporation and then nitrogen stripping. Compared with the prior art, the step-by-step stripping method provided by the present invention removes H2S, CO2 and ammonia from the acidic water, avoids the simultaneous existence of H2S, CO2 and NH3 in the stripping tower top system, effectively solves the problems of pipeline blockage and equipment corrosion caused by ammonium salt crystallization, prolongs the stable operation period of a conversion device, simultaneously reduces the treatment difficulty of a sulfur recovery unit and facilitates the long-term stable operation of the sulfur recovery unit.

Description

technical field [0001] The invention relates to a method for treating acidic water produced in a hydrogen production device in the field of coal chemical industry. Background technique [0002] In the process of producing hydrogen and methanol by using coal water slurry, dry coal powder, and crushed coal gasification technology, the process condensate of the carbon monoxide conversion device contains a large amount of NH 3 、H 2 S and CO 2 , also known as acidic water. At present, in the field of coal chemical industry, the acid water treatment method mainly adopts the steam stripping method, that is, the NH dissolved in water is dissolved in the stripping tower. 3 、H 2 S, CO 2 resolved by steam stripping. NH-enriched extract from stripper overhead gas 3 、H 2 S, CO 2 The acid gas is usually condensed and then sent to the flare or sent to the sulfur recovery unit. Since these acid gases will produce crystals of thiamine and ammonium bicarbonate when the temperature i...

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Application Information

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IPC IPC(8): C02F9/10C02F1/20C02F1/10C02F1/06
Inventor 郑明峰王显炎邢涛张骏驰赵国忠李忠燕魏蒙
Owner CHINA PETROLEUM & CHEM CORP
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