Discussion on desulfurization problems and solutions (Part 1)

Thread Content

The Dongshi Desulfurization Technology Collaboration Network made a decision at last year's "Suzhou Conference" to organize an investigation team composed of relevant experts and engineering technicians to conduct a comprehensive investigation on the desulfurization situation of fertilizer companies in the relevant provinces in the first half of 2006. This measure is also implemented * * The National Development and Reform Commission and other seven ministries and commissions on the spirit of launching the 2006 National Energy Conservation Publicity Week. The investigation team members visited more than 20 fertilizer and chemical companies in Shandong, Henan, Anhui, Shanxi, Hunan, Hubei, Yunnan, Guizhou and other provinces in the two months of May and June through centralized investigation and separate visits. The intensive visits included Shandong Laixi Fertilizer Factory, Shouguang Fertilizer Factory, Kenli Chemical Factory and Qilu No. 1 Fertilizer Factory. ； Henan Xinxiang Xinlianxin Fertilizer Factory, Linying Fertilizer Factory, Zhumadian Junma Company Headquarters Fertilizer Factory, Xixian Fertilizer Factory ； Three fertilizer branches affiliated to Shanxi Linyi Fengxi Group ； Feixi Fertilizer Factory in Hefei, Anhui. Here we only give a summary report on the investigation of ten fertilizer and chemical companies that were visited intensively, for reference only. 1 Overview of these 10 companies, except for the Kenli Chemical Plant in Shandong, which combines coal and oil field gas as raw materials, and whose products are mainly methanol, the terminal products of the other 9 plants are basically urea and methanol (all have co-production methanol units, Shouguang and Linyi also have 10×104t/a monool units). Except for the slightly smaller production scales of Kenli and Feixi plants (about 7×10 4t/a), the other eight plants have larger production scales, with total annual ammonia capacity of more than 10×10 4t/a. Among them, Shouguang and Fengxi are the largest, with annual total ammonia capacity of 40×10 4t (10×10 4t/a monool is not included). Most of the absorbents are soda lye. Only the old system of Shouguang Plant uses a little ammonia recovered from copper washing for semi-desorption, and the Xixian Plant uses ammonia for degeneration. There are 7 sets of devices using "888" for desulfurization catalysts, involving 7 companies. “There are 8 sets of devices for mixing 888” with tannin extract. “There is one set of 888" and MSQ-3 mixed. Desulfurization towers all use packing (bulk packing or grid packing), and the types of packing are similar. Only a few units use a section of grid packing at the bottom of the desulfurization tower, such as several units affiliated to Shanxi Fengxi Group. The regeneration uses self-priming air to regenerate the oxidation tank, which has a set of liquid level self-adjusting instruments. In order to ensure safe production, each enterprise controls the degree of purification more strictly. As long as the conversion is not a fully low-conversion process, most of the hydrogen sulfide indicators after semi-desorption are