Are there any good methods for desulfurization and decarbonization in coal chemical processing?

Each method has its own advantages and disadvantages, depending on the benefits you are seeking. Currently, MDEA, NHD, and low-temperature methanol washing are the most commonly used methods

Our company uses the tannin method for desulfurizing semi-water gas, the DDS method for desulfurizing shifted gas, and the MDEA method for decarburization – all of which yield excellent results. The CO2 content in the purified gas is less than 0.1%

Currently, in the coal chemical industry, MDEA is generally used by small and medium-sized enterprises for desulfurization; NHD is used by medium-sized enterprises, while low-temperature methanol washing is employed by large enterprises. Additionally, depending on the gasification method used in coal chemical processing, different conversion processes are adopted, resulting in desulfurization methods either before or after conversion. Modern large-scale coal chemical plants mostly use fluidized-bed gasification; the gasification temperature is high, resulting in very little organic sulfur. Sulfur-tolerant shift reactors are employed for the shift process, with desulfurization carried out before the shift step, and low-temperature methanol washing is generally used after the shift process

Agree with the opinion on Floor 4: 1. The integrated low-temperature methanol washing technology for desulfurization and decarbonization is the most mature, advanced, and reliable, but it requires substantial investment and is generally used in large-scale coal chemical plants. 2. NHD is a physical absorption-based desulfurization and decarbonization process suitable for China’s national conditions. Although its technical performance is not as good as that of low-temperature methanol washing, it requires less investment, and its overall energy consumption is lower than that of the traditional thermal potassium-alkali method for decarbonization. It is the preferred choice for small and medium-sized enterprises to carry out technological upgrades, and it can also be considered for new medium-scale coal chemical plants. 3. MDEA requires the lowest one-time investment, but has high energy consumption; it is not recommended for new projects. 4. The above three processes all refer to gasification under pressure or desulfurization and decarburization at medium pressure; for traditional batch gasification at atmospheric pressure in a fixed-bed system, desulfurization using tannin at atmospheric pressure + desulfurization of the reformate gas + PSA for decarburization is a better option. This post was last edited by zjyang168168 on 2007-11-29 17:09.]

Personally, I think NHD is better for desulfurization and decarbonization!