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Method and device for selectively removing hydrogen sulfide from gas by utilizing amine droplets

A hydrogen sulfide and selective technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of not forming large-scale industrial applications, the threat of long-term operation of compressors, and the difficulty of operation.

Active Publication Date: 2012-12-26
SHANGHAI HUACHANG ENVIRONMENT PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantage is that the selection of biological enzymes needs further screening, and the cultivation takes a long time, the process is not easy to control, and the operation is difficult, so it is still in an experimental research stage and has not yet formed a large-scale industrial application.
[0008] In addition, the existing amine liquid desulfurization devices all have different degrees of amine liquid loss.
On the one hand, it directly causes the loss of expensive amine agent (the market price of amine agent is about 25,000 yuan / ton), which increases the operating cost. Gas and LPG are torched and cause downstream devices to be generated or shut down, resulting in huge losses; on the other hand, it seriously affects the quality of gas products, such as LPG with too much amine, which leads to unqualified copper sheet corrosion indicators; and the amine liquid in the gas eventually passes through the pipeline Low point condensate drainage or liquid separation tank in front of the heating furnace is discharged into the dirty oil system or sewage system to form secondary pollution, which directly increases the burden on the sewage treatment plant. If it enters the chemical plant, the harm will be even greater
In addition, fuel gas, circulating hydrogen and other mixed gases with liquid and dust pose a serious threat to the long-term operation of the compressor

Method used

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  • Method and device for selectively removing hydrogen sulfide from gas by utilizing amine droplets

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Experimental program
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Effect test

Embodiment 1

[0072] In a 20000m 3 In the natural gas production and treatment process of / h, according to the method of the present invention, the micro-swirl flow is used to strengthen the selective hydrogen sulfide removal device, in order to contain H 2 S and CO 2 Such natural gas mixed gas is subjected to micro-swirl flow enhanced separation to achieve high efficiency and low loss of natural gas and H in a variety of acid gas mixed gases 2 The effective separation of S, its specific operation process and effect are described as follows:

[0073] 1. Mixed gas properties and operating conditions

[0074] The mixed gas is natural gas, the main components are 96% alkanes, 1% H 2 S and about 3% CO 2 . Natural gas processing capacity is 20000m 3 / h, gas phase density, the operating temperature is 50°C, and the operating pressure is 2.7MPa. The concentration of N-methylethylene glycol amine solution is 20-40%, and it is atomized through the atomizing nozzle, and the average atomized pa...

Embodiment approach

[0076] The mixed gas containing hydrogen sulfide entrains the amine liquid droplets and quickly enters the microcyclone through the spray tube. In the microcyclone, the MDEA droplets and the hydrogen sulfide in the mixed gas fully contact and react and absorb in the supergravity environment. At the same time, the liquid droplets and the mixed gas are separated by ultra-low pressure drop gas-liquid micro-swirl flow, and the amine liquid is separated from the purified mixed gas, and the pressure drop is less than 30mmH 2 O (300Pa). H in purified gas 2 The content of S is less than 10ppm; the amine solution is enriched, recovered, regenerated, and recycled.

[0077] 3. Experimental results

[0078] After the selective separation of hydrogen sulfide is enhanced by using the micro-swirl method, the H at the gas phase outlet of the separator 2 The S content is not more than 10ppm, and the content of entrained liquid phase is less than 50mg / m 3 .

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Abstract

The invention relates to a method and a device for selectively removing hydrogen sulfide from gas by utilizing amine droplets, and provides the method for selectively removing hydrogen sulfide from gas by utilizing amine droplets. The method comprises the steps of (1) atomizing N-methyldiethanolamine solution into droplets with particle size of not larger than 50 micrometer; (2) uniformly mixing the droplets with hydrogen sulfide-containing mixed gas, and introducing into a micro-swirler; (3) allowing thorough contact and reaction between N-methyldiethanolamine droplets and hydrogen sulfide in the micro-swirler to transfer hydrogen sulfide into the droplets, and meanwhile separating the hydrogen sulfide-absorbed droplets from gas; and (4) enriching the hydrogen sulfide-absorbed droplets, recycling, regenerating, and circulating to the step (2). The invention also provides the device for selectively removing hydrogen sulfide from gas by utilizing amine droplets.

Description

technical field [0001] The invention belongs to the field of chemical energy and environmental protection, and relates to a method of using N-methyldiethanolamine solution (MDEA) to atomize micro-droplets, and using a micro-cyclone to selectively remove hydrogen sulfide components in mixed gases. Specifically, the present invention relates to a method for removing hydrogen sulfide components by micro-swirls from mixed gases such as refinery gas and natural gas and separating MDEA droplets by micro-swirls. The invention also relates to a device for atomizing MDEA into droplets and removing hydrogen sulfide and MDEA droplets from the mixed gas. Background technique [0002] At present, the production of clean fuel, an environment-friendly product in our country, is imminent. And our country H 2 The reserves of gas reservoirs with an average S content greater than 1% account for about 1 / 4 of the national gas reservoir gas reserves, so the removal of H in refinery gas and natu...

Claims

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Application Information

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IPC IPC(8): B01D53/79B01D53/52
Inventor 钱鹏汪华林许德建崔馨黄聪闫超
Owner SHANGHAI HUACHANG ENVIRONMENT PROTECTION
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