Second public announcement on the environmental impact assessment for the aerospace-scale super-large powder coal gasification project demonstration project of Shandong Runyin Biochemical Co., Ltd

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Second Public Announcement on the Environmental Impact Assessment of the Aerospace Super-large Pulverized Coal Gasification Project Demonstration Project by Shandong Runyin Biochemical Co., Ltd. Author/Source: Ruixing Group Co., Ltd. Date: 2020-02-01 Clicks: 417 I. Overview of the Enterprise and Project Shandong Runyin Biochemical Co., Ltd. plans to invest 1,980,290,000 yuan to build an aerospace super-large pulverized coal gasification project demonstration project within its existing factory complex. This project involves upgrading the two existing ammonia synthesis units with a capacity of 500,000 tons per year; purchasing HT-L pulverized coal pressurized gasification furnaces and related equipment; installing a 480 t/h pulverized coal boiler; constructing new air separation units, sulfur-resistant shift units, low-temperature methanol washing units, liquid nitrogen washing units, sulfur recovery units, low-temperature methanol washing refrigeration units, and carbon dioxide compression units. Utilizing the existing ammonia synthesis units, the project will produce the intermediate product ammonia at a rate of 960,000 tons per year, while also generating 98% concentrated sulfuric acid as a by-product. Upon completion of the project, the plant’s synthetic ammonia production capacity will be 1.96 million tons per year. According to the reply issued by the Tai’an Bureau of Industry and Information Technology, titled \"Reply on the Situation Regarding the Ammonia Synthesis Capacity of Shandong Runyin Biochemical Co., Ltd.\" (Document No. Tai Gong Xin Cai 84), Shandong Runyin Biochemical Co., Ltd. currently has 45 fixed-bed batch gasifiers, giving it an overall ammonia synthesis capacity of 1 million tons per year. It has been agreed that this capacity can be used as a substitute for that of the \"Aerospace Super-Large Scale Pulverized Coal Gasification Project Demonstration Project.\" Once this demonstration project is completed and put into operation, the existing 45 fixed-bed batch gasifiers along with their associated equipment will be removed, so that the company’s total ammonia synthesis capacity will not increase. Upon comparison with the \"Guidelines for Industrial Structure Adjustment (2019 Edition)\\", this project does not fall under the categories of projects that are encouraged, restricted, or to be phased out; it belongs to the category of projects that are permitted. The equipment used in the project does not include any **equipment designated for phase-out, and its installation complies with** relevant industrial policies. The project has been registered with the Tai’an Economic and Information Technology Commission, under registration number: Tai Jing Xin Gai Bei 01. II. Generation of “three wastes” in the project and control measures: During the production process of this project, various pollutants are emitted, causing certain impacts on the environment. The main impacts on the surrounding environment include: (1) Exhaust gases. The exhaust gases generated after the engineering modifications mainly come from the coal crushing bin emissions, the coal conveying system, the filters in the pulverized coal storage tanks, the non-condensable gases resulting from the flash evaporation of ash water in coal gasification, the exhaust gases from the shift reaction, the vent gases from low-temperature methanol washing, the sulfur-containing exhaust gases from sulfur recovery, boiler exhaust gases, as well as uncontrolled dust, methanol, ammonia, sulfur dioxide, and sulfuric acid mist. Organized waste gases: The gases emitted from the coal crushing bin are treated using high-efficiency bag filters and then discharged through an exhaust stack that is 62 meters high and 0.2 meters in diameter. The waste gases from the coal conveying system are also treated with high-efficiency bag filters before being discharged through an exhaust stack that is 120 meters high and 1.2 meters in diameter. The gases emitted from the pulverized coal storage tank filters are treated using high-efficiency bag filters and then discharged through an exhaust stack that is 110 meters high and 1 meter in diameter. The non-condensable gases generated during the flash evaporation of gasification ash water and the waste gases from the shift reaction are sent to a 260 t/h boiler for desulfurization; after that, they are discharged through an exhaust stack that is 90 meters high and 5 meters in diameter. The exhaust gases from the low-temperature methanol washing process are washed in an exhaust gas scrubber tower before being directly discharged into the atmosphere through an exhaust stack that is 105 meters high and 1.6 meters in diameter ； The sulfur-recovered sulfur-containing exhaust gas is captured of its sulfuric acid mist by an acid mist collector, and then discharged through an exhaust stack that is 35 m high and 1.15 m in diameter ； The boiler exhaust gas is treated for denitration using electrobag dust removal, ammonia-based desulfurization, and selective catalytic reduction (SCR), with simultaneous removal of mercury and its compounds, before being discharged through an exhaust stack that is 120 meters high and 5 meters in diameter. All the above exhaust gas emission concentrations meet the requirements of the corresponding emission standards. Unorganized waste gases: These mainly originate from dust, ammonia, methanol, sulfur dioxide, and sulfuric acid mist released during production and storage processes. Their emission amounts and concentrations are low, resulting in minimal environmental impact. (2) Wastewater: For the wastewater generated in this project, a comprehensive treatment approach that separates clean water from polluted water, as well as separates different types of polluted water, is adopted. The condensate from the transformation process is sent to the degassing unit after heat exchange ； The ash water from gasification, the wastewater from low-temperature methanol washing, and the wastewater from circulating water are sent to the terminal treatment plant for production wastewater; domestic sewage is treated in the artificial wetlands within the factory site. After meeting the requirements specified in the \"Comprehensive Discharge Standards for Water Pollutants in River Basins – Part 1: The Nansi Lake and Dongping Lake Basins\" (DB37/3416.1-2018) for general protection areas, this water is discharged into the Wen River main canal, where it eventually flows into the Weizi River ； The wastewater from the shallow desalination station and the wastewater from the desalinated water production process are saline wastewater, which is sent to the plant’s concentrated water reuse system for treatment. Once it meets the standards specified in \"Quality Standards for Industrial Water Derived from Urban Sewage Reuse\" (GB/T19923-2005), it is reused as make-up water for the desalination station. The resulting concentrated water is used for spraying at coal piles and coal storage areas, as well as as make-up water for desulfurization and dust removal processes ； The boiler drainage is used as make-up water for ammonia-based desulfurization in a 480t/h boiler. The wastewater from this project has a minimal environmental impact after treatment. (3) Noise: The main sources of noise in this project are compressors, various pumps, fans, coal mills, etc., with noise levels generally ranging from 80 to 95 dB(A). After implementing noise reduction measures such as sound insulation and vibration damping, the impact of noise at the factory boundaries remains largely unchanged compared to before the engineering modifications. It is expected that the noise levels at these boundaries during both day and night will meet the requirements of Class 3 standards specified in the \"Emission Standards for Environmental Noise at the Boundaries of Industrial Enterprises\" (GB312348-2008). (4) Solid waste: The solid waste generated by this project mainly includes coal slag discharged by the scraper slag remover and the filter cake from the filters, waste molecular sieves from air separation units, waste alumina from air separation units, waste catalysts from shift reaction processes, waste detoxifiers from shift reaction processes, waste molecular sieves from liquid nitrogen washing, waste catalysts from sulfur recovery processes, boiler slag, ash discharged from dust collectors, waste denitration catalysts, and household waste. Sulfur recovery waste catalysts and waste denitration catalysts are classified as hazardous waste, and should be disposed of by qualified entities ； Spent molecular sieves from air separation, spent alumina from air separation, spent catalysts from shift reaction, spent detoxifiers from shift reaction, and spent molecular sieves after liquid nitrogen washing are recovered by the manufacturers ； The coal slag discharged by the scraper slag extractor and the filter cake from the filter are used for road construction or as building materials ； Boiler slag and dust collector ash are used as materials in cement production, while domestic waste is processed centrally by the sanitation department. In summary, all solid wastes can be comprehensively utilized. (5) Environmental risks: By implementing risk prevention measures and emergency response plans in areas such as the general layout design, storage and transportation design, process technology design, automatic control design, electrical and telecommunications design, fire protection and fire alarm system design, and emergency rescue design, the environmental risk level of this project remains acceptable, and the engineering risks can be effectively controlled.