Dry desulfurization is that the feed gas passes through the solid bed with solid Desulfurizer at a certain space speed, and then adsorbs the H2S in the gas phase to the desulfurizer through gas-solid contact exchange, so as to achieve the purification purpose of natural gas desulfurization equipment.
1. Iron method
Iron process is an old desulfurization method. In the desulfurization process, H2S reacts with iron hydroxide. When the desulfurizer is alkaline, the desulfurization reaction is carried out according to the first reaction formula above. When the desulfurizer is neutral or acidic, the desulfurization reaction is carried out according to the second reaction formula. The regeneration reaction speed of desulfurizer is slower than that of desulfurization, which is the control step of the whole process.
2. Iron oxide process
Iron oxide, known as sponge iron, is an old and famous gas desulfurization method, which is still widely used in many specific fields. Only α - Fe203 · H2O and γ - Fe203 · H20 are used for gas desulfurization of natural gas desulfurization equipment, which are easy to react with H2S. It is important that the resulting iron sulfide is easily re oxidized to the activated form of iron oxide.
3. NCA solid absorption method
This method is proposed by Dow Chemical Company to remove H2S. NCA solid contains 80% NaOH and 20% Ca (OH) 2 (both refer to mass percentage). This method can also remove high content and low molecular weight mercaptans in the gas while removing H2S. The NCA solid process is non regenerative, so its chemical consumption is quite high compared with the H2S removed. The solid after reaction is washed out periodically with water from the bottom of the tower.
4. Zinc oxide process
Zinc oxide method is one of the methods used for refined desulfurization of gas. Since zinc oxide desulfurizer is generally no longer used or abandoned after being used in natural gas desulfurization equipment, this method is only suitable for removing a small amount of sulfur, and the amount of desulfurizer should be guaranteed to be used for more than one year. When the sulfur content of feed gas is high, it should be used together with wet desulfurization or other dry desulfurization.
The above is about the natural gas desulfurization equipment process dry desulfurization related content introduction, I believe you all understand, if you want to know more content, welcome to click biological desulfurization http://www.hneee.net Official website.