Combined treatment process and system for acid gas

A treatment system and treatment process technology, applied in the direction of gas treatment, dispersed particle separation, membrane technology, etc., can solve the problems of high energy consumption of amine liquid regeneration, complex production equipment, high energy consumption of rich absorption liquid regeneration, and reduce energy consumption , The effect of environmental protection in the treatment process

Active Publication Date: 2018-11-02
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two-stage Claus + tail gas hydrogenation reduction + solvent absorption technology is mature, and the quality of the product sulfur is stable. However, due to the long process, large investment, high energy consumption, high requirements for device safety control, and the Claus process can only handle high-concentration acid gases, so , this technology has no advantages for sour gas treatment in small refineries
Refinery acid gas contains H 2 In addition to S gas, it also contains a certain amount of CO 2 gas, during the production of soda sulfide, CO 2 The gas will produce Na with raw lye 2 CO 3 / NaHCO 3 Impurities cause blockage of process pipelines in the production process, resulting in the failure of long-term continuous operation of production equipment, and there are problems such as high alkali consumption and poor product purity.
[0007] Patents CN102765700A and CN102807193A disclose NaHS production process and NaHS continuous absorption reaction production device with two-stage absorption, one-stage alkali protection and one-stage adsorption process, acid gas and alkali agent adopt countercurrent absorption method, and finally the solution is evaporated, concentrated and dehydrated, cooled Molding, packaging process, to complete the generation process of NaHS, this technology is only applicable to the pure hydrogen sulfide absorption process, and does not consider CO 2 Effect of gas
CN103551018A discloses a method for purifying and recycling sulfur-containing tail gas, using barium sulfide to treat CO in the gas 2 Removed to obtain H 2 S gas can produce high-quality NaHS products, but it produces barium sulfite and barium carbonate precipitates, which are difficult to handle
Patent CN103754833A discloses a device and method for producing NaHS using refinery dry gas, using supergravity technology to perform selective desulfurization on dry gas to obtain 99% H 2 The purity of NaHS produced by S gas can reach more than 42%, but the raw material gas pretreatment process of this technology is long, the production equipment is complex, and the energy consumption of regeneration of rich absorption liquid is high
The NaHS production technology described in CN103446849A, CN103466559A and CN103638802A also faces the problems of complicated process, high energy consumption of amine liquid regeneration in acid gas pretreatment, etc.

Method used

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  • Combined treatment process and system for acid gas
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] A refinery sour gas volume Q=800Nm 3 / h, pressure 0.8Mpa, where H 2 S volume fraction is 78%, CO 2 The volume fraction is 20%, and the remainder is hydrocarbons and other substances. usefigure 1 The treatment method and device shown are for treatment of acid gas. Wherein, the hydrate decomposer adopts a conventional tank structure with heat exchange equipment inside, and a stripping gas inlet pipeline is arranged on the shell of the hydrate decomposer.

[0090] The operating conditions and treatment effects in the treatment process are as follows: the hydrate working fluid consists of water, SDS with a mass fraction of 0.04% in the aqueous solution, polyethylene glycol with a mass fraction of 18% in the aqueous solution, diesel oil with a volume ratio of 2 / 3 to water, It is composed of Span (sorbitan fatty acid ester) emulsifier with a molar ratio of 1% to water. The acid gas is pressurized to 1.3Mpa by the compressor and then introduced into the hydration reactor,...

Embodiment 2

[0092] Same as Example 1, the difference is that the figure 2 In the structure of the decomposer, the volume ratio of the hydrate heating section to the hydrate decomposing gasification section is 1 / 1, the liquid holding capacity in the hydrate heating section is 1 / 2 of the volume of the section, and the hydrate heating section is 1 / 2. The liquid holdup in the decomposing and gasifying section is 1 / 2 of the total volume of the section, and the ruptured baffle assembly in the hydrate decomposer adopts a screen mesh structure with an average hole diameter of 5 mm.

[0093] Due to the use of the preferred hydrate decomposer provided by the present invention, two-stage high-efficiency cascade heat exchange is carried out, and the heat of the whole process is reasonably utilized, and the working liquid can be decomposed (regenerated) ) is more complete, and when the same effect as Example 1 is achieved, the amount of hydrate working fluid can be reduced to 13m 3 / h, reducing the ...

Embodiment 3

[0095] The same as Example 2, the difference is that the hydrate working fluid used is composed of water, SDS with a mass fraction of 0.04% of the aqueous solution, diesel with a volume ratio of 2 / 3 to water, and Span with a molar ratio of 1% to water. (Sorbitan fatty acid ester) emulsifier composition.

[0096] Under the same operating conditions of the hydrate reactor as in Example 2, CO in the tail gas treated by the hydration reactor 2 The concentration is reduced to less than 70%; after the hydrate-rich working fluid is treated by the hydrate decomposer, the CO in the gas 2 The concentration rises to about 5%, increasing the CO 2 form Na 2 CO 3 / NaHCO 3 The influence of other substances on the continuous and stable operation of the NaHS production unit increases the difficulty of the long-term operation of the device.

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Abstract

The invention discloses a combined treatment process and a system for acid gas. According to the combined treatment process and the system, NaHS products meeting national quality standards can be produced while up-to-standard discharge of the acid gas is realized; environmental improvement is organically combined with the production process of a chemical product. Compared with the prior art, the process and the system disclosed by the invention have the advantages that the acid gases containing CO2 and hydrogen sulfide can be economically and efficiently pretreated, energy in the technologicalprocess is reasonably utilized and energy consumption is greatly reduced; the whole treatment process is environmentally friendly and reliable and no three wastes are produced.

Description

technical field [0001] The invention relates to an acid gas treatment process and system, in particular to the purification of acid gas containing carbon dioxide and hydrogen sulfide and the recovery and utilization of pollutant resources. Background technique [0002] Refinery acid gas is a kind of processing tail gas produced in the process of petroleum processing, and its main component is H 2 S and CO 2 . Refinery acid gas mainly comes from sour water stripping, circulating hydrogen desulfurization, dry gas and liquefied gas desulfurization and other devices. Large-scale refineries have a large amount of acid gas (annual sulfur output > 5000t / a), and generally build acid gas treatment devices for sulfur production (such as Claus process and LO-CAT process). 2 S for recycling. For small and medium-sized refineries (annual sulfur output <5000t / a), due to the small amount of acid gas, the cost of setting up sulfur facilities is relatively high. waste, and the com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/74B01D53/75B01D53/78B01D53/52B01D53/62
CPCB01D53/526B01D53/74B01D53/75B01D53/78B01D2259/124
Inventor 孟凡飞彭德强王海波王璐瑶陈新
Owner CHINA PETROLEUM & CHEM CORP
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