Method and device for removing hydrogen sulfide from gas by using suspension of ferric oxide powder

Abstract

The invention relates to a method for removing hydrogen sulfide from gas by using suspension of ferric oxide powder. In the method, the hydrogen sulfide is removed from the gas by using the suspension of ferric oxide powder, and the method comprises the following steps of: mixing the ferric oxide powder with particle diameter of between 0.01 and 300 microns and water to form the suspension of ferric oxide powder for desulfurization; controlling the weight percentage of the ferric oxide in the suspension within the range from 0.5 to 60 percent; conveying the suspension of ferric oxide powder into a desulfurizing tower for circular sprinkling; fully mixing sulfur-containing gas and the suspension of ferric oxide powder in the desulfurizing tower and discharging the gas after desulfurization from the top of the desulfurizing tower; and allowing the suspension of ferric oxide powder which absorbs the sulfur to flow out of the desulfurizing tower and recycling the suspension after regenerating. The method has the advantages of good desulfurization effect, low pollution and small investment.

Description

technical field [0001] The invention belongs to the technical field of desulfurization, and in particular relates to a wet desulfurization method for removing sulfides such as hydrogen sulfide in gas by using iron oxide powder suspension. Background technique [0002] The method of wet desulfurization of gas containing sulfide such as hydrogen sulfide is currently widely used and the process with better desulfurization effect is the liquid-phase catalytic oxidation method. [0003] The liquid-phase catalytic oxidation method usually uses a weakly alkaline solution (such as sodium carbonate, ammonia water, etc.) Sodium hydride (ammonium hydrogen sulfide) or sodium polysulfide (ammonium polysulfide), and then use oxygen in the air as an oxidant to oxidize to sulfur, so that the solution (mother liquor) can be regenerated. [0004] There are many kinds of process devices utilizing this method, but all have the following disadvantages: [0005] 1) The temperature requirements ...

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Problems solved by technology

[0005] 1) The temperature requirements are high during use, and the temperature is required to be controlled within the range of 10°C to 50°C during desulfurization, so the use occasions are limited;

[0006] 2) Due to the formation of double salts during the desulfurization process, part of the desulfurization liquid must be discharged regularly to cause environmental pollution;

[0007] 3) The product sulfur (or sulfur paste) contains sodium ions and oxygen carrier catalyst components, which is unfavorable for product sales and poor economic benefits;

[0008] 4) Oxygen carrier catalyst and alkali need to be added regularly, so the cost of desulfurization is high;

[0009] 5) Oxygen carrier catalyst and alkali are highly corrosive to carbon steel, so the desulfurization unit needs to consider anti-corrosion issues, resulting in high one-time investment for the desulfurization unit;

[0010] 6) Although the liquid-phase catalytic oxidation method has a higher degree of purification than other wet desulfurization methods, it can only remove hydrogen sulfide in the gas to 50mg / m 3 Left and right, the gas that requires higher sulfur content needs to be treated by dry desulfurization;

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