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A method and device for treating acid gas

A treatment device and treatment method technology, applied in the direction of separation methods, chemical instruments and methods, sulfur compounds, etc., can solve the problems of no consideration of influence, high energy consumption of amine liquid regeneration, complicated process, etc., and achieve the goal of promoting the formation of gas hydrates Effects of formation, increase of solubility and diffusion coefficient, reduction of gas-liquid interfacial tension

Active Publication Date: 2021-05-04
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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  • A method and device for treating acid gas
  • A method and device for treating acid gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Acid gas volume Q=400Nm in a refinery 3 / h, pressure 0.7Mpa, where H 2 S volume fraction is 84%, CO 2 The volume fraction is 15%, and the remainder is hydrocarbons and other substances. use figure 1 The shown processing method and device process acid gas. Wherein, the hydrate decomposer adopts a conventional tank structure with heat exchange equipment inside, and the shell of the hydrate decomposer is provided with a stripping gas inlet pipeline.

[0087] The operating conditions and treatment effects during the treatment process are as follows: the hydrate working fluid consists of water, SDS accounting for 0.03% of the aqueous solution, polyethylene glycol accounting for 12% of the aqueous solution, diesel oil with a volume ratio of 1 / 2 to water, Composed of Span (sorbitan fatty acid ester) emulsifier with a molar ratio of 0.8% to water. The acid gas is pressurized by the compressor to 1.2Mpa and then introduced into the hydration reactor, where it reacts with t...

Embodiment 2

[0089] Same as Example 1, the difference is that using figure 2 In the structure of the decomposer, the volume ratio of the hydrate heating section of the hydrate decomposer to the hydrate decomposition and gasification section is 1 / 1, the liquid holdup in the hydrate heating section is 1 / 2 of the volume of this section, and the hydrate The liquid holding capacity of the decomposing gasification section is 1 / 2 of the total volume of this section, and the rupture partition assembly in the hydrate decomposer adopts a screen structure with an average hole diameter of 5mm.

[0090] Due to the use of the preferred hydrate decomposing device provided by the present invention, two stages of high-efficiency cascade heat exchange are performed, and the heat of the entire process is rationally utilized, and the working fluid can be decomposed (regenerated) under the same hydrate decomposing operating conditions as in Example 1 ) is more complete, to achieve the same effect as in Exampl...

Embodiment 3

[0092] Same as Example 2, except that the hydrate working fluid used is emulsified by water, SDS accounting for 0.03% of the mass fraction of the aqueous solution, diesel oil with a water volume ratio of 1 / 2, and Span with a water molar ratio of 0.8%. agent composition.

[0093] Under the same hydrate reactor operating conditions as in Example 2, the CO in the tail gas treated by the hydration reactor 2 The concentration is about 75%; after the hydrate-rich working fluid is treated by the hydrate decomposer, the CO in the gas 2 The concentration is about 5%, increasing the CO 2 form Na 2 CO 3 / NaHCO 3 The impact of substances such as NaHS on the continuous and stable operation of the NaHS production unit has increased the operational difficulty of the long-term operation of the device.

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Abstract

The invention discloses a treatment method and device for acid gas. The device comprises a hydration reactor, a hydrate decomposing device, a primary absorption reactor, a secondary absorption reactor and a product tank. Also provided is a method for treating acid gas using the above device. It can produce NaHS products that meet the national quality standards while achieving acid gas discharge standards, and organically combine environmental governance with the production process of chemical products into an integrated process. Compared with the prior art, the method of the present invention can cost-effectively treat CO-containing 2 The acid gas of the gas is pretreated, and the energy in the process is rationally utilized, which greatly reduces energy consumption; the entire treatment process is environmentally friendly, reliable, and produces no "three wastes".

Description

technical field [0001] The invention relates to a treatment method and device for acid gas, 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 c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/52B01D53/96C01B17/32
CPCB01D53/52B01D53/78B01D53/96C01B17/32
Inventor 孟凡飞彭德强王海波王璐瑶陈新
Owner CHINA PETROLEUM & CHEM CORP
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