制氢尾气发电机组的燃料中湿法脱硫工艺有正压脱硫和负压脱硫两种。下面我们探讨一下正压脱硫和负压脱硫有哪些区别。

　　There are two wet desulfurization processes for the fuel of hydrogen production tail gas generators: positive pressure desulfurization and negative pressure desulfurization. Let's explore the differences between positive pressure desulfurization and negative pressure desulfurization.

　　一、正压脱硫

　　1、 Positive pressure desulfurization

　　正压脱硫设置在鼓风机后，吸收传质推动力较负压高，煤气净化设备规格小，建造及运行费用省。脱硫前一般设有预冷塔，预冷塔可对煤气中的焦油、萘、煤粉、焦粉等进一步洗涤，使得由煤气带入脱硫系统的杂质减少，对催化剂活性的影响小，脱硫脱氰效率高，硫磺产品杂质含量低。

　　Positive pressure desulfurization is set after the blower, which absorbs mass transfer driving force higher than negative pressure. The gas purification equipment has a small specification and saves construction and operation costs. Before desulfurization, a pre cooling tower is generally installed, which can further wash tar, naphthalene, coal powder, coke powder, and other impurities in the gas, reducing the impurities brought into the desulfurization system by the gas, with little impact on catalyst activity, high desulfurization and decyanation efficiency, and low impurity content in sulfur products.

　　煤气经鼓风机加压升温，在脱硫前需设置预冷塔对煤气进行冷却，需要消耗部分冷却水，且预冷塔效果直接影响煤气温度，一旦控制不佳将直接影响脱硫效果，有可能还会导致脱硫系统涨液，特别是在夏季高温天气下，温度控制较为困难，正压脱硫效率会降低。另外，因脱硫设置在鼓风机后，不会对鼓风机系统造成影响，对鼓风机的材质要求低，建设及维护费用低。

　　The gas is pressurized and heated by a blower. Before desulfurization, a pre cooling tower needs to be set up to cool the gas, which consumes some cooling water. The effect of the pre cooling tower directly affects the gas temperature. Once the control is not good, it will directly affect the desulfurization effect and may even cause the desulfurization system to swell, especially in hot summer weather where temperature control is difficult and the efficiency of positive pressure desulfurization will decrease. In addition, since desulfurization is installed after the blower, it will not affect the blower system, with low material requirements for the blower and low construction and maintenance costs.

　　二、负压脱硫

　　2、 Negative pressure desulfurization

　　负压脱硫设置在鼓风机前，从电捕焦油器出来的煤气直接进入脱硫塔，中间未经鼓风机加压升温，省去预冷塔及部分冷却水，煤气净化流程相对缩短，占地面积小。但由于负压脱硫一般不设置预冷塔，煤气没有预洗涤的效果，因此进入由煤气带入脱硫系统的杂质较多，导致催化剂活性降低，脱硫、脱氰效率相比正压脱硫低，且硫磺产品杂质含量相对高。

　　Negative pressure desulfurization is set in front of the blower, and the gas from the electric tar catcher directly enters the desulfurization tower without being pressurized and heated by the blower, eliminating the need for a pre cooling tower and some cooling water. The gas purification process is relatively shortened and occupies a small area. However, due to the fact that negative pressure desulfurization generally does not have a pre cooling tower and the gas does not have a pre washing effect, there are more impurities introduced into the desulfurization system by the gas, resulting in a decrease in catalyst activity, lower desulfurization and decyanation efficiency compared to positive pressure desulfurization, and relatively high impurity content in sulfur products.

　　另外，鼓风机在脱硫后，煤气出脱硫塔经过气液分离后仍然会带少量水（脱硫液），导致鼓风机入口煤气中水汽含量高，鼓风机运行负荷加大，同时脱硫液进入鼓风机，导致腐蚀性增强，鼓风机叶轮及系统、设备管道均需采用不锈钢材质制作，使建设及维护费用增加。

　　In addition, after desulfurization, the blower still carries a small amount of water (desulfurization solution) after the gas exits the desulfurization tower and undergoes gas-liquid separation, resulting in high water vapor content in the inlet gas of the blower and increased operating load of the blower. At the same time, the desulfurization solution enters the blower, leading to increased corrosiveness. The blower impeller, system, and equipment pipelines all need to be made of stainless steel material, which increases construction and maintenance costs.

　　正压脱硫和负压脱硫各有优缺点，目前负压脱硫只有少数厂采用，两者工艺相比较,虽操作运行费用相当，但建设费用正压脱硫具有优势，因此正压脱硫被广泛应用。

　　Positive pressure desulfurization and negative pressure desulfurization each have their own advantages and disadvantages. Currently, only a few factories adopt negative pressure desulfurization. Compared with the two processes, although the operating costs are comparable, positive pressure desulfurization has advantages in construction costs. Therefore, positive pressure desulfurization is widely used.

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