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Successful Commissioning of Acid Production Facility Using Desulfurization Waste Liquor from Hong’an Coking Company Author/Source: Coal Tar Deep Processing and Hydrogenation Technology Collaboration Group Date: 2020-09-16 Clicks: 1 On September 11, the acid production facility that utilizes desulfurization waste liquor and sulfur paste, built by Zhongke Yuandong for Shanxi Hong’an Coking Technology Co., Ltd., was officially put into operation; the quality rate of the products produced was 100%. Shanxi Hong’an Coking Technology Co., Ltd. selected the invention patent technology from Zhongke Yuandong (ZL201811316789.6) and signed a contract for the EPC turnkey project for producing acid from desulfurization waste liquid and sulfur paste. The installation of the mechanical equipment was completed on May 16, 2020, followed by individual unit tests and joint commissioning starting in August 2020. 1600150084968041553.jpg In recent years, as environmental regulations on coking enterprises have become increasingly strict, desulfurization waste liquid has been classified as solid waste by the environmental protection authorities. As a result, coal and coking enterprises are under great pressure to handle this waste liquid. If such waste liquid and sulfur paste solid waste cannot be properly treated, it will become a bottleneck for the development of these enterprises. Without any existing references in China for the pretreatment of desulfurization wastewater, Zhongke Yuandong developed an original dilute acid sealing and purification technology that completely solves the problem of preventing the release of dilute acid. This process unit not only requires low investment, features a high level of technological sophistication, but is also safe and reliable, as well as environmentally friendly. At the same time, a series of challenges related to the development of acid production technologies and the commissioning of related equipment were also resolved. Zhongke Yuandong’s wet pre-treatment + dry acid production process completely solves the problems of recycling the sulfur paste generated by wet oxidation desulfurization as well as the subsequent treatment of salt-containing desulfurization liquid, thereby enabling effective utilization of sulfur resources. The sulfuric acid produced can be directly used in the ammonium sulfate production process to manufacture ammonium sulfate or sold externally, thereby truly achieving the comprehensive and resource-based utilization of waste by-products from coking production. 1600150093231099375.jpg According to the technical staff from Hong’an Coking Acid Production, the plant in this project utilizes processes such as atomized combustion, closed purification with dilute acid, China’s first SCR denitration system, multi-stage conversion and absorption, as well as advanced treatment of exhaust gases; these processes are mature and reliable. During the pretreatment stage, some valuable materials are separated and recovered; the incinerator is equipped with a lattice wall to trap dust and particulates, thereby improving gas purification efficiency and increasing the incineration temperature. A heat recovery system is added to the exhaust outlet of the furnace, which reduces the consumption of coke oven gas and air as well as the investment costs in subsequent processing units by increasing the temperature of the combustion air. The dilute acid generated in the purification unit can be fully recycled, thus eliminating the need for its discharge outside the facility. The exhaust gases meet regulatory standards: the sulfur dioxide (SO₂) concentration is less than 30 mg/Nm3, and the nitrogen oxides (NOx) concentration is less than 50 mg/Nm3. At present, the device is operating smoothly; the product performance and exhaust emission parameters meet or exceed the design specifications, surpassing expectations, and it offers good environmental and economic benefits.