What are the main factors affecting the effect of gas desulfurization?

⑴, raw material quantity and raw material composition: The amount of raw materials and the composition of the raw materials have a great impact on production. When the amount of raw materials increases or the hydrogen sulfide content increases, the hydrogen sulfide removal must be achieved by increasing the amine liquid circulation volume. However, due to the influence of the amine liquid regeneration capacity, gas carrying amine, amine liquid foaming and other factors, the increase in the amine liquid circulation volume is strictly limited, and other adjustment methods must be used to achieve the purpose of hydrogen sulfide removal. Therefore, the amount of amine circulation must be adjusted in time according to changes in the amount and properties of raw materials. , acid gas load: The ratio of the number of molecules of acid gas (H2S+CO2) in the rich liquid at the bottom of the absorption tower to the number of molecules of ethanolamine in the solution is called the acid gas load, which is an important factor in determining the technical and economic indicators of the gas desulfurization device. The choice of solution load is mainly based on the impact on device corrosion. When using carbon steel to manufacture equipment, the solution load should be limited to less than 0.35 moles of acid gas/mole of ethanolamine. , solvent concentration: The higher the solvent concentration, the better the removal effect, but the easier it is to foam and the loss will increase. The normal range is 20 to 40%, which has a lot to do with the type of amine liquid selected. , operating pressure: Ethanolamine absorption is chemical absorption, so the pressure of the absorption tower mainly depends on the pressure of raw gas and purified gas delivery. The top pressure of the desorption tower depends on the equilibrium steam pressure at the lean liquid desorption temperature according to the product requirements, which is generally 0.035~0.115MPa. It is usually required to ensure that there is enough pressure to allow the acid gas to enter the sulfur recovery device, so that the desorbed ethanolamine solution can enter the pump through the heat exchanger. , operating temperature: The temperature at which the lean liquid enters the absorption tower is in the range of 25 to 40°C. Within this temperature range, the ethanolamine solution absorbs hydrogen sulfide at a very fast rate. The regeneration temperature mainly depends on the specifications of the purification product and the relative contents of hydrogen sulfide and carbon dioxide in the raw gas. The complex of monoethanolamine and hydrogen sulfide is easier to decompose. When the ratio of H2S/CO2 in the raw gas is high, the solution regeneration temperature is 110~116°C, and most of the H2S has been desorbed. Excessively high regeneration temperature cannot continue to reduce the remaining hydrogen sulfide content, but increases the corrosion of the equipment and the decomposition of the ethanolamine solution.

1. Changes in hydrogen sulfide content in raw materials； 2. Are the pressure and temperature operations of the regeneration tower normal? ； 3. Type and concentration of amine liquid ； 4. Amine liquid circulation volume. It has an impact on the removal of hydrogen sulfide. In general operation, only 4 is enough. ； 2 Just be stable ； Adjust 3 only under special circumstances.

Temperature, pressure, concentration, and circulation volume all have an impact, and can be compared from the following aspects: 1. When the circulation volume reaches a certain value, it will have little effect. You need to find the appropriate circulation volume. 2. Concentration: Try to increase the concentration as much as possible without foaming. 3. Temperature and pressure can be plotted at a certain concentration to see which one has the larger slope.