Dry desulfurization equipment for blast furnace gas fine desulfurization

-Process route for fine desulfurization of blast furnace gas-

After the blast furnace gas comes out of the furnace top, it first passes through gravity dust removal and bag dust removal devices to reduce the dust content to below 10 mg/Nm ³, and then enters the turbine power generation device (TRT) to generate electricity using gas pressure and temperature. Then, through the hydrolysis conversion device, carbonyl sulfide and carbon disulfide are converted into hydrogen sulfide, and then enters the desulfurization device to remove hydrogen sulfide from the gas using dry desulfurizer. Finally, it enters various gas consumption points for utilization. After desulfurization, the sulfur dioxide concentration in the flue gas emitted from each gas consumption point meets the ultra-low emission requirements.

-Advantages of precision desulfurization technology for blast furnace gas-

1. It does not affect TRT power generation, and all hydrolysis and desulfurization processes are placed after TRT;

2. No waste liquid is generated, and the dry process route does not produce waste liquid;

3.desulfurizationHigh precision, total sulfur content less than 500mg/Nm ³, more suitable for dry process;

4. Not afraid of sulfur fluctuations, no additional operation is required when the sulfur content in the gas fluctuates;

5. Unmanned operation, fixed bed technology, only inspection required;

6. Long operating time, with a service life of more than 1 year for hydrolysis and desulfurization agents;

7. Environmental protection loop, the hydrolyzed and desulfurized agents replaced can be reused in the factory;

8. The industrial application has achieved significant results, and the front-end dry desulfurization process has successfully operated for 8 consecutive years.

-Industrial application cases-

In 2012, Hunan Hualing Henggang Group adopted the steel plant gas resource utilization technology of Beijing Beida Pioneer Technology Co., Ltd. and built a set of blast furnace gas heating device. The blast furnace gas processing capacity was 67000 cubic meters per hour, and the heating value was increased from 700 kcal/cubic meter to 2100 kcal/cubic meter, which was used as fuel gas for steel rolling heating furnaces. In the process of increasing calorific value, the pressure swing adsorption (PSA) process is used to purify the concentration of carbon monoxide in blast furnace gas from 21% to 70%. The PSA purification equipment for carbon monoxide has strict requirements for the sulfur content in blast furnace gas, and the total sulfur content must be below 0.1ppm. Therefore, Peking University Xianfeng built its first set of equipment at that timeFront end dry desulfurization device for blast furnace gasTo meet the strict requirements for total sulfur content in subsequent PSA processes.

In this project, blast furnace gas is purified by dust removal and then passed through a hydrolysis tower to convert organic sulfur in the gas into inorganic sulfurGas cooling is achieved through a desulfurization tower, which oxidizes inorganic sulfur into elemental sulfur to achieve desulfurization. After desulfurization, the blast furnace gas directly enters the PSA purification process for carbon monoxide. The data shows that the entire PSA carbon monoxide separation equipment, including front-end dry desulfurization, has been running continuously and stably since its commissioning in 2013.