Public Notice on the Environmental Impact Assessment Completion for the 200,000 tons/year coal-to-methanol project of Northwest Energy and Chemicals

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Public Notice on the Environmental Impact Assessment for the Completion of the 200,000 tons/year coal-to-methanol project at Northwest Energy and Chemicals. Author/Source: Yaha Consulting. Date: 2017-09-26. Clicks: 16. Public notice issued by the Ordos Environmental Protection Bureau regarding the proposed environmental impact assessment decision for the completion of this construction project on September 20, 2017. Project Name: Ordos Northwest Energy and Chemical Co., Ltd.
Construction Location: Within the Coal Chemical Industry Base on Ordos Avenue
Constructor: Ordos Northwest Energy and Chemical Co., Ltd.
Inspection and Monitoring (Survey) Unit: Inner Mongolia Haoyu Environmental Protection Co., Ltd.
Project Overview: It is a new construction project. The main construction components include a 200,000-ton/year coal-to-methanol production plant along with associated auxiliary facilities. The total actual investment in the project is 1.9 billion yuan, of which 135 million yuan is allocated to environmental protection measures, accounting for 7.1% of the total investment. In September 2008, the Environmental Protection Department of Inner Mongolia Autonomous Region approved the project’s environmental impact report (No. Neihuan Shen 117). Construction of the project began in October 2012, and it was put into operation in September 2016. During the acceptance monitoring period, the production load reached over 75% of the designed load, and the environmental protection facilities installed as part of the facility have been put into use simultaneously. Implementation of environmental protection measures: (1) There are raw coal silos (4×6000t); 8 bag filters are installed in the raw coal crushing workshop, transfer points, and raw coal silos, along with fully enclosed coal transfer trestles. Two bag filters are installed for the 2 boilers; ammonia-based desulfurization and selective non-catalytic reduction (SNCR) technologies are used for denitrification. The chimney is 120 meters high, and it is equipped with online flue gas monitoring systems that are connected to the environmental protection authorities (not yet approved). The balanced off-gas from the methanol distillation section, the vapor from the crude methanol flash tank in the methanol synthesis section, and the recovered exhaust gas from the hydrogen recovery section are burned in a boiler. The gas lift off-gases from the H2S concentration tower in the desulfurization and decarbonization unit, the sulfur recovery off-gases, and the exhaust gases from the shift condensate gas lift tower are absorbed through ammonia-based desulfurization in a boiler, and then discharged through a 120-m-high boiler chimney. The sulfur recovery exhaust gas is treated using the direct catalytic oxidation and exhaust gas recycling process: the exhaust gas is burned in a boiler, then absorbed by a desulfurization unit, and finally discharged up to standard specifications through a 120-m-high chimney. The CO2 vent pipeline has been constructed, with the discharge outlet installed on the flare frame at a height of 52 m above the ground. (II) Process wastewater (91.3 t/h) and domestic sewage (22.4 m3/h) are sent to an SBR biological wastewater treatment plant with a processing capacity of 80 m3/h. The treated reclaimed water, along with the wastewater from the recirculation water station (80 t/h) and the wastewater from the desalination station (40 t/h), is fed into an ultrafiltration + reverse osmosis advanced treatment system with a processing capacity of 200 m3/h. The resulting reclaimed water is reused, while the concentrated brine (74.1 m3/h) is discharged through a concentrated brine pipeline to the concentrated brine treatment facilities in the Daliu Industrial Park; online monitoring equipment is installed at the concentrated brine discharge outlet. An accident tank with a capacity of 5,000 m3 has been built. (III) A hazardous waste temporary storage facility with a floor area of 200 m2 has been built; waste lubricants and waste catalysts have not yet been transported away. A slag storage facility (with a capacity of 200 m3) and an ash storage facility (with a capacity of 200 m3) have been built. Boiler slag (14,400 t/year), boiler ash (18,000 t/year), gasifier ash and slag (61,200 t/year), and sludge after softening treatment (600 t/year) are all sent to the site’s landfill for disposal. The biochemical treatment sludge (165 t/a) is sent to the boiler for incineration ； Domestic waste (42 t/a) is collected by the park’s sanitation department. (IV) Equipment that generates significant noise, such as air compressors and exhaust fans, are placed in enclosed buildings, and measures such as vibration reduction and sound insulation have been taken. (5) The total green area of the factory complex is 48,000 square meters. (VI) Dikes and sewage diversion valves have been installed in the intermediate storage tank area and the product tank area, along with gas alarms. An emergency response plan for sudden environmental risk incidents was formulated and filed with the Environmental Protection Bureau of the Ordos Dali Coal Chemical Industry Base.