Discuss how to control the acidic gas concentration in the NHD desulfurization regeneration tower
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Currently, there is a problem of fluctuations in the concentration of acidic gas in the NHD desulfurization regeneration tower during production, with these concentrations varying between 10% and 18%. Please discuss how to control this concentration more effectively. The factors affecting it include the exit temperature and pressure of the acidic gas, the amount of steam used, the reflux ratio, and the system load, assuming that the volume and composition of the feed gas remain stable.
Oh, the concentration of acidic gas in the regeneration tower is regulated mainly through two methods: 1. Increasing the nitrogen used for gas stripping can raise the concentration of acidic gas; 2. Reducing the control pressure in the flashing section can also increase the concentration of acidic gas. Additionally, if a higher concentration of acidic gas is desired, the circulation volume should be reduced as much as possible, which will lead to a rapid increase in the acidic gas concentration. In fact, the main components of acidic gas are H2S and CO2, and to increase the concentration of H2S, it is necessary to reduce the amount of CO2. Any operational method that allows for a reduction in CO2 levels can be used for this purpose