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The entire plant consists of the Claus sulfur recovery unit of Dutch Hofung Company and the Ltscot low-temperature hydrogenation sulfur recovery unit of JACOBS in the Netherlands. According to Jia Baoxiang, the company's Director of Technology Development Department, through the effective docking of traditional technologies with new sulfur recovery technologies, not only sulfur recovery rates have been improved, but also the emission of harmful substances has been reduced, and the operational flexibility and safety level of the devices have also been greatly improved, achieving energy savings and cost savings. And increase efficiency.
The results of the trial run of the oximation device show that with the special catalyst of JACOBS company, the organic sulfur can be hydroconverted at a lower temperature and a gentler pressure, and the device can run smoothly in the load range of 20% to 110%. The amount of exhaust gas treated by the Ltscot plant is only 70 ppm, which is less than 1/5 of the latest national emission standards, and the total sulfur recovery rate is over 99.9%. Compared with the simple Claus sulphur recovery unit, there are more than 930 tons of sulphur dioxide annually.
According to Wang Zhenyue, technical service manager of JACOBS, the currently widely used sulfur recovery technologies include Claus sulfur recovery technology and Scot hydrogenation technology. The former requires that the content of hydrogen sulfide in the reaction medium must reach 25% to 32%, and about 5% of the sulfur in the exhaust gas cannot be recovered. Although the latter can handle low-concentration sulfur-containing medium, the catalyst has a short service life, high hydrogenation reaction temperature and pressure, and high energy consumption. In order to solve the above problems, in 2004, JACOBS began Ltscot technology laboratory development, in 2009 the industrialization of the test certificate, and then promoted in Europe, America and the Asia-Pacific region.
Ltscot technology can be well coupled with Claus technology, which better solves the problems of sulfur-containing media treatment and energy saving and emission reduction in energy and chemical companies. It is favored by users when it is launched. At present, there are nearly 20 such devices in China, but only one Suihua Group has been built for trial operation.
Shaanxi Suihua Group newly built sulfur recovery unit has recently started trial operation. The total investment of this device is over 50 million yuan, and the sulfur recovery capacity is designed to be 34 tons per day. After production, all sulphur-containing exhaust gases produced by the Suihua Group's 300,000 tons/year coal-synthetic ammonia plant and 600,000 tons/year methanol plant can be recovered. More than 10,000 tons of sulfur.