"Coke Chemical Industry Pollutant Discharge Standard" is about to be implemented
“In order to meet the requirements of the new “Standardsâ€, we are building a 600,000-ton/year-old blue-carbon and 500,000-ton/year coal tar hydrogenation project that adopts advanced waste water and waste gas treatment technologies and air-cooling technologies at home and abroad. It can minimize the use of water and pollutants for the project and ensure that all emission targets meet or even exceed the requirements of the new “Standard.†On September 22, Yan Yufei, project manager of Yanan Anyuan Chemical Co., Ltd., appeared to be very satisfied when interviewed by reporters. confidence. The new "Standard" referred to by Yu Yufei refers to the "Emission Standard for Pollutants in Coking Chemical Industry" to be implemented on October 1. The standard was compiled on the basis of the original “Emission Standard of Coke Oven Air Pollutantsâ€, and the pollutant emissions of the coking enterprises were clearly stipulated, and the coal preparation, coking, gas purification, and coking of the existing and newly-built coke oven production processes were made. Wastewater pollutants and atmospheric pollutants emissions from chemical product recycling and thermal energy utilization have put forward strict requirements. Compared with the original "Standards," the new "Standard" has increased the emission control targets for 10 pollutants including polycyclic aromatic hydrocarbons and COD, and has significantly increased the emission requirements for harmful substances such as benzene and cyanide. The new “Standard†requires that the PAHs discharged by the company should be ≤ 0.05 (mg/L, the same below), COD ≤ 80, ammonia nitrogen ≤ 10, benzene ≤ 0.1, sulphide ≤ 0.5, cyanide ≤ 0.2, and total phosphorus. ≤ 1.0, volatile phenol ≤ 0.3, total nitrogen ≤ 20. The new "Standard" also stipulates that the existing coking enterprises must meet the above emission requirements by December 31, 2014 at the latest, and the new coking enterprise will implement the new "Standard" on October 1 this year. "The requirements of the new "Standard" are quite high and it is difficult to implement it. Only by controlling from the source can we ensure the discharge of standards." said Yu Fei. For this reason, Anyuan Company increased the investment in environmental protection facilities during the project design. Of the total investment of RMB2.339 billion in the first phase, the environmental protection investment exceeded RMB 150 million, accounting for 6.4% of the total project investment. They will use Tsinghua University's benzene-containing wastewater treatment technology to pretreat benzene-containing pollution, and then send it to a 65-ton/hr sewage treatment plant for centralized treatment to ensure that organic pollutants such as polycyclic aromatic hydrocarbons and benzene are fully met. At the same time, the introduction of advanced desulfurization and deamination technologies at home and abroad, supporting the construction of 1,000 tons / year sulfur recovery unit and ammonium sulfate production facilities, to achieve the utilization of sulfur and ammonia nitrogen resources. “We will help enterprises pass the environmental protection examination by optimizing the process and building a recycling economy industrial chain.†Zhang Ligang, general manager of Shaanxi Jiaojiao Chemical Group, said to reporters. He explained that because of the complex composition of coking sewage and the difficulty and cost of handling it, considering the economic aspect alone, the economic cost of reaching the standard emission is relatively large, so it is necessary to recycle waste water as much as possible. To this end, in 2011, Shaanxi Jiao Company built a 200,000-ton/year methanol plant for coke oven gas, and is currently constructing a 70,000-ton/year methanol purge and ammonia plant ammonia synthesis project. After the first quarter of next year, the company will form coal-to-coke. - Methanol-synthetic ammonia integrated industrial chain, to achieve the dry pressing of coke oven gas exhaust gas and zero emissions. At the same time, the company also carried out a comprehensive technological transformation of the wastewater treatment and recirculating water system to recycle the circulating cooling water, steam condensate, and process condensate of the coking plant, methanol, and ammonia plant, and cascaded the process condensate. The concentrated wastewater was integrated into the wastewater treatment plant. The ion-exchange membrane + deep biochemical treatment, and then return to the system as a cooling water process, to achieve zero discharge of wastewater. As the largest semi-coke production enterprise in the country, Shaanxi Coal Chemical Group Shenmu Energy Development Co., Ltd. has a production capacity of 2.6 million tons/year of semi-coke, and the annual by-production of raw gas exceeds 1 billion cubic meters. Li Taifeng, executive deputy general manager of the company, admits that since the energy company is a demonstration enterprise of circular economy in Shaanxi Province, the provincial Environmental Protection Agency has higher requirements and hopes that the company's emission targets will meet the requirements of the new “Standard†in March next year. This was more than one year ahead of schedule, with tight schedules and pressure. In order to achieve the “special requirements†of the Provincial Environmental Protection Agency, the company is working on energy saving and emission reduction in the following two aspects: The first is the utilization of exhaust gas resources. Following the successful commissioning of a 2×50 MW raw gas generator unit in the first phase, the company has invested heavily in the construction of a second phase 2×50 MW gas generator unit. At present, the equipment installation of the project is nearing completion, and equipment commissioning and stand-alone testing are started. It is expected to start production in late October. Once in normal operation, a total of 200 megawatt generator sets can not only “eat†more than 1 billion cubic meters/year of raw gas produced by the company and achieve zero emission of exhaust gas, but also can absorb the waste gas of neighboring companies and provide energy savings for the park. Rows work to play a role. In order to control the sulfides and dust generated from the burning of raw gas, the company also spent 62 million yuan and 40 million yuan respectively to build advanced desulfurization equipment and boiler electrostatic dust removal facilities. The second is to increase the intensity of wastewater treatment and reuse. The company invested 3.9 million yuan, built a 200 cubic meter/hour wastewater treatment plant, and reused all wastewater from the power plant and reused it. The company also plans to spend 20 million yuan to introduce the mine waste water from the Shenmu Carnefta coal mine of the Shaan Coal Group, 30 kilometers away, into the power plant. After sedimentation, together with the quench coke water from the semi-coke plant, it will also be sent to the wastewater treatment plant for further treatment. For boilers and power plants and semi-coke devices for recycling. According to the reporter’s understanding, Shenmu Tianyuan Chemical Co., Ltd. has adopted advanced gas-water incineration technology and raw gas hydrogen production technology, and has already reached the new “Standard†emission requirements in advance; Shaanxi Black Cat Coking Co., Ltd. has launched desulfurization, denitrification, sulfur recovery, coke Furnace gas to methanol cogeneration ammonia plant to achieve the utilization of waste gas resources; Fugu Dongxin Xin and Yulin Qianyuan chemical cogeneration coal tar hydrogenation plant under construction are adjusting the wastewater according to the new “Standard†requirements. The exhaust gas treatment design plan adopts more advanced technology to ensure that the project will reach or exceed the emission requirements of the new "Standard" once it is put into operation. Flat Roller Bearings,Cylindrical Roller Bearing,Alloy Wheel Bearing Xiangyang Bearing Co., Ltd. , http://www.china-bearings.com