Method for removing hydrogen sulfide from gas

A technology for removing gas and hydrogen sulfide, applied in combustible gas purification, chemical instruments and methods, combustible gas purification/transformation, etc., can solve problems such as sulfur plugging, large floor area, and large equipment investment, and achieve sulfur plugging towers The effect of reduced pressure, reduced absorption pressure, and large operating flexibility

Inactive Publication Date: 2012-07-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] With the mining of sulfur-containing oilfield gas and high-sulfur coal mines, the requirements for desulfurization are getting higher and higher; the use of amine method can basically meet the requirements of desulfurization of natural gas and refinery gas, and the Claus de

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: The hydrogen sulfide in the gas is removed by using the complex iron solvent of the present invention, the gas enters the washing pipe from top to bottom, the desulfurization liquid passes through the nozzle, and is sprayed in reverse direction from bottom to top to the gas, gas-liquid two-phase The medium collides at high speed in the washing pipe, and when the momentum of the gas-liquid two-phase medium reaches equilibrium, a highly turbulent foam zone is formed, in which the gas-liquid two-phase not only has a large contact area, but also the contact surface is quickly renewed, thus Enhanced heat transfer and mass transfer efficiency to achieve efficient washing effect. The use of large-diameter nozzles is not prone to sulfur clogging. This process uses the washing technology in the foam area, and does not need to atomize the washing liquid. The nozzle is mainly to ensure that the washing liquid has sufficient flow on the washing pipe plane and is evenly d...

Embodiment 2

[0035] Embodiment 2: test method is the same as embodiment 1

[0036] (1) Test conditions

[0037] Prepare the concentration of hydrogen sulfide with water gas to 15.7 g / ·Nm 3 the test gas.

[0038] Test gas flow rate: 1 Nm 3 / Hour

[0039] Gas pressure: 10kpa

[0040] Nozzle flow: 12 liters / hour

[0041] Packed tower flow: 7 liters / hour

[0042] Absorption and regeneration temperature: ~40 o C

[0043] Solution pH 8.2

[0044] (2) Desulfurization effect

[0045] Under the above test conditions, continuous ventilation for 24 hours, the average content of hydrogen sulfide in the outlet gas of the dynamic wave absorber measured during the absorption process is 1500mg· / Nm 3 . The average content of hydrogen sulfide in the outlet gas of the packed tower is 14mg / Nm 3

Embodiment 3

[0046] Embodiment 3: test method is the same as embodiment 1

[0047] (1) Test conditions

[0048] Prepare the concentration of hydrogen sulfide with carbon dioxide-containing gas to 25.8 g / ·Nm 3 the test gas.

[0049] Test gas flow rate: 1 Nm 3 / Hour

[0050] Gas pressure: 10kpa

[0051] Nozzle flow: 18 liters / hour

[0052] Packed tower flow: 12 liters / hour

[0053] Absorption and regeneration temperature: ~40 o C

[0054] Solution pH 8.2

[0055] (2) Desulfurization effect

[0056] Under the above test conditions, continuous ventilation for 24 hours, the average content of hydrogen sulfide in the outlet gas of the dynamic wave absorber during the absorption process is 2200mg· / Nm 3 . The average content of hydrogen sulfide in the outlet gas of the packed tower is 19mg / Nm 3

[0057] The invention provides a relatively suitable method and device for sulfur recovery of low-pressure coal gas, associated gas and acid gas.

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Abstract

The invention relates to a method for removing hydrogen sulfide from gas, and belongs to the technical field of gas purification. The method mainly comprises the steps: firstly introducing the gas containing hydrogen sulfide to a kinetic wave absorber for removing a large amount of hydrogen sulfide, and then entering the gas containing a small amount of hydrogen sulfide to a filled tower for fine desulfurization; converting hydrogen sulfide in the gas into sulfhydryl radical ion in the absorption process by using a complex iron absorbing liquid; oxidizing rich solution absorbing hydrogen sulfide with air for regeneration so as to convert the sulfhydryl radical ion into simple substance sulfur harmless to environment, wherein the treated gas achieves the discharge requirement; and entering the gas containing sulfur into the kinetic wave absorber, and carrying out countercurrent contact with a complex iron desulfurizing liquid sprayed from bottom to top so as to form a stable form layer, so that the absorbing liquid carries out quick rotary cutting, and the gas and liquid are sufficiently contacted, thus the mass transfer efficiency is obviously improved, and the purification requirements that the hydrogen sulfide gas is quickly absorbed, most of hydrogen sulfide is removed by the kinetic wave, and a small amount of hydrogen sulfide in the gas is removed by the filled tower are achieved.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and relates to a method for removing hydrogen sulfide from gas. Specifically, the invention is an oxidation-reduction desulfurization method combining dynamic waves and packed towers. Background technique [0002] As we all know, industrial feed gas containing hydrogen sulfide will cause corrosion of pipelines and equipment, catalyst poisoning, and affect product quality; exhaust gas containing hydrogen sulfide will cause serious environmental problems. [0003] The methods for removing hydrogen sulfide mainly include: (1) dry desulfurization, such as iron oxide method, zinc oxide method and activated carbon method. (2) Alcohol amine method. (3) Wet oxidation methods, such as ADA method, tannin extract method, MSQ method, PDS method and complex iron method, etc. (4) Physical solvent methods such as low-temperature methanol method, NHD method, etc. [0004] The wet oxidation method has...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/52C10K1/10C01B17/05
Inventor 杨建平俞健健冯亚平龚建琴
Owner CHINA PETROLEUM & CHEM CORP
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