At present, my country's oil and gas resources are still insufficient. There are more than 20,000 gas generators of various types in my country. There are atmospheric fixed-bed furnaces, accounting for about 98%; there are also pressurized fixed-bed furnaces, fluidized furnaces and entrained-bed furnaces, accounting for about 2%. two-stagegas generatorThe process of cold purified gas stations was used in the production of foreign countries in the 1950s. In the early 1960s, experimental research work was carried out on two-stage gasifiers in China. In the 1980s, they were all absorbed and domesticated. The two-stage gasifiers used now are completely domestically produced coal gasification processes after introduction and absorption. This process is the most widely used gasification technology in industrial production today. The technology includes gasification, waste heat recovery, indirect air cooling, indirect water cooling, and gas purification systems. This process is currently very mature and has been used as gas for more than 20 years in the domestic ceramics, glass, refractory materials, alumina, nonferrous metals, and steel industries. At the same time, it is equipped with corresponding environmental protection equipment to remove hydrogen sulfide contained in coal gas, and meeting environmental protection requirements after combustion is the main development trend in the future.

 

Basic situation of generator gas desulfurization application:

 

In the gas generator industry, commonly used desulfurization systems are divided into three categories: dry desulfurization, gas wet oxidation desulfurization, and flue gas desulfurization. Judging from the practical applications in recent years, dry desulfurization and flue gas desulfurization are the most popular processes among users. These two desulfurization processes have lower initial investment costs, but they have shortcomings such as frequent maintenance and replacement of desulfurizers, high operating costs, short service life, low purification, and secondary pollution. The coal gas wet desulfurization process has been continuously improved and integrated, and has gradually been accepted by users. It can reduce labor intensity, improve efficiency while meeting environmental protection requirements, and can ensure long-term continuous and stable operation. Among the coal gas wet desulfurization processes, the 888 desulfurization method is generally recognized by the majority of users for its stability, high efficiency, no tower blockage, and simple and convenient use. We chose Dongshi Company’s 888 wet desulfurization agent and wet desulfurization technology as the desulfurization supporting equipment for producer gas.

The process is as follows:

 

The gas from the gas generator area after dust removal (coke) and cooling contains hydrogen sulfide about 550 to 3000mg/Nm3, temperature: 35-50℃, pressure: 8-15Kpa. It enters the gas scrubber tower to pre-wash the gas. After washing The temperature of the gas after scrubbing is about 40 degrees. It enters the desulfurization tower and is counter-currently contacted with the desulfurization solution sprayed from the top of the tower to absorb H2S. For high hydrogen sulfide content configuration, two-stage desulfurization is selected to reduce the H2S in the tower gas to below 50-80 mg/Nm3.

After absorbing H2S, the desulfurization rich liquid is discharged from the bottom of the desulfurization tower and enters the rich liquid tank. The pressure is boosted by the rich liquid pump and sprayed into the regeneration tank through the ejector. Regeneration is carried out in the tank. The air used for regeneration is introduced by the ejector. The regenerated lean liquid is sent to the desulfurization tower for reuse through the lean liquid tank and lean liquid pump, and the regeneration air is vented from the top of the regeneration tank.

The sulfur foam flotated from the spray regeneration tank flows to the sulfur foam tank to separate the sulfur from the solution. The sulfur liquid is pumped to the filter for filtration. The solution flows into the rich liquid tank and returns to the system circulation. The sulfur paste is filtered out from the filter press. The filtered elemental sulfur is stored in a cool and ventilated place. When the stock reaches a certain amount, it is sent out for centralized harmless treatment.