Flue gas desulfurization and denitrification technology is currently recognized as an effective technology for controlling sulfur dioxide pollution. Foreign flue gas desulfurization technology started in the 19th century. After more than one hundred years of development, hundreds of flue gas desulfurization technologies have been developed. Among the more representative technologies are calcium method, sodium method, magnesium method, and the like. These flue gas desulfurization technologies have played a major role in the control of sulfur dioxide pollution in developed countries, but they are still traditional pollution control models characterized by high mining, high pollution, high consumption and low efficiency.
1 Mass transfer resistance in flue gas desulfurization wet desulfurization. The idea that wet desulfurization is controlled by mass transfer has been confirmed. Although the PDS desulfurization method has emerged, it shows the great effect of the new liquid phase catalyst, that is, adding a small amount of H can achieve better desulfurization effect, but this does not deny the past. The idea of strengthening mass transfer in wet desulfurization is wrong. In fact, technologies such as structured packing and vertical sieve trays developed in recent years have strengthened the mass transfer process and have new developments in desulfurization applications.
2 Wet desulfurization sulfur recovery. The desulfurization equipment of China's fertilizer plant not only undertakes the task of purifying gas, but also converts hydrogen sulfide into monomer sulfur. However, the recovery rate of this sulfur resource is not high, many of it is discharged, and sulfur block is easily formed in the tower. Seriously affect production. The fine sulfur particles are not easy to be filtered and recovered, and the adhesion to the filler and the wall is also strong. Therefore, it is tried to make the sulfur particles as thick as possible, and the suspended sulfur in the desulfurization solution is minimized, which will help solve the problem.
3 The change rule of sulfide in the synthetic ammonia production chain. H2S and organic sulfur in ammonia plant gas are in a changing environment. At present, we know more about the change of hydrogen sulfide, but little is known about the change law of carbonyl sulfide and carbon disulfide. Through the analysis of the change of sulfur in the nitrogen fertilizer plant conversion, carbonization, copper washing, ammonia and other processes, it is found that the organic sulfur is greatly reduced in addition to the hydrolysis conversion in the conversion, in the process of contacting the ammonia solution or liquid ammonia with the gas. It is removed to varying degrees, especially for carbonyl sulfide. In the carbonization stage, there is a “displacement” effect of carbon dioxide, and the concentration of organic sulfur at the outlet of the main tower is greatly increased. Due to the low temperature and good gas-liquid contact, the ammonia has an excellent removal function for carbonyl sulfide.
Ammonia catalyst sulfur poisoning may be caused more by carbon disulfide. In addition, in the converted hot water saturation system, a small amount of hydrogen sulfide will be further deeply oxidized to form sulfate, which affects the production of food grade ammonium bicarbonate. Therefore, revealing the change law of sulfide in this production chain should be one of the research directions.