Low-temperature methanol washing process

To keep the hydrogen sulfide content in the purified gas at <0.1 ppm while maintaining the carbon dioxide content at around 2.5%, the following steps must be taken: 1. In the low-temperature methanol washing process, increase the amount of methanol used, optimize the flow rate and temperature of the methanol wash solution, thereby improving the absorption efficiency of hydrogen sulfide. 2. Control the temperature of the syngas to reduce the levels of hydrogen sulfide and carbon dioxide in it, thereby decreasing the burden on the regenerated methanol wash solution. 3. Use effective catalysts and reactor systems to reduce the generation of hydrogen sulfide and carbon dioxide, thereby improving gas purity. 4. Strengthen the maintenance and cleaning of equipment, regularly replace adsorbents and solvents, and promptly remove impurities and contaminants from the washing solution. In short, only by strictly controlling the process parameters of the methanol wash and adopting scientific and effective process measures can it be possible to absorb hydrogen sulfide while ensuring an appropriate level of carbon dioxide; as a result, the hydrogen sulfide content in the gas sent for synthesis purification should be less than 0.1 ppm, with the carbon dioxide content being around 2.5% or higher. .

The temperature in the synthesis reactor is too high. In order to increase the carbon content, we tried adjusting it using a semi-poor liquid, but the effect was not significant; reducing the system temperature by 2°C also didn’t work

The temperature in the synthesis reactor is too high; using a semi-poor liquid to adjust carbon enhancement does not yield significant results, and the situation remains poor even after the system temperature is reduced by 2°C. It may be caused by the following reasons: 1. The concentration of the semi-poor solution is insufficient. If the concentration of the semi-poor liquid is too low, its ability to adjust carbon will be limited. One can try increasing the amount of semi-poor solution added or raising its concentration. 2. The temperature of the reaction furnace is too high. If the reactor temperature is too high, adjusting the semi-poor liquid alone cannot solve the problem; it is necessary to consider reducing the reactor temperature. 3. There are voids inside the reaction furnace. If there are voids inside the reactor, causing the gas to stay there for a longer time, the carbon content will naturally increase. Under such circumstances, the effect of semi-poor liquid adjustment is also limited. It is necessary to consider cleaning or repairing the reaction reactor. 4. There are problems with the exhaust gas treatment equipment. If there are problems with the exhaust gas treatment equipment, such as a failed catalyst, it can lead to an excessively high carbon content in the exhaust gases. Under such circumstances, the effectiveness of semi-poor liquid adjustment is also limited, and it is necessary to inspect and maintain the exhaust gas treatment equipment. In summary, to address the issues of excessively high temperatures in the synthesis reactor and poor effectiveness of adjusting the semi-poor liquid, a comprehensive analysis and assessment are required, along with appropriate measures to resolve these problems. .

Flash regeneration is thorough, improving the degree of methanol regeneration； Increase the solution circulation rate ； Reduce system temperature and minimize heat loss ； Adjust the upstream unit to prevent significant fluctuations in components!