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Recently, as a new technology to remove hydrogen sulfide components in the exhaust of refinery units, the high-gravity desulfurization technology was successfully tested on the first side-line of the Shanghai Petrochemical No. 4 refinery unit.
It is understood that desulfurizers will also absorb some of the carbon dioxide while removing hydrogen sulfide, which is not conducive to the improvement of desulfurization efficiency. High-gravity desulfurization technology jointly developed by Shanghai Petrochemical, East China University of Science and Technology and Beijing Chemical Industry Research Institute mainly focuses on the desulphurization and decarbonization selectivity of high-efficiency compound desulfurizers for sulfur tail gas under high-gravity conditions. The influence of equipment and operating parameters such as gas-liquid ratio, lean liquid concentration, etc. on the desulfurization and decarbonization effect and selectivity are optimized for the selective gravity desulfurization equipment parameters and process conditions to achieve the purpose of enhanced desulfurization, regulation of decarbonization, and improvement. H2S removal efficiency.
In the 24-day experiment, Shanghai Petrochemical used three different concentrations and types of desulfurizers. It was found that the speed, gas-liquid ratio, and concentration of lean liquid in the super-gravity machine were the key factors affecting the selectivity of desulfurization and decarbonization. The high-gravity desulfurization technology can be operated normally in the existing industrial plant regeneration tower. When the sulfur content of the regenerated poor liquid is not higher than 0.5 g/L, the hydrogen sulfide content in the purified tail gas is not higher than 80 mg/standard cubic meter, and the carbon dioxide is co-absorbed. The rate is not higher than 20% of the target.
Efficient removal of hydrogen sulfide components from the tail gas can not only increase the sulfur recovery rate of the sulfur recovery unit, but also have an important significance in reducing sulfur emissions, continuously improving the environmental performance level of the refinery unit, and adapting to increasingly stringent exhaust emission standards.
The data of this successful experiment provides valuable technical references for improving the efficiency of exhaust gas desulfurization, reducing the co-absorption rate of carbon dioxide, reducing sulfur emissions, and improving the environmental protection operation level of sulfur recovery plants in the refining industry.
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