The full utilization of tail gas is the direction that coking, calcium carbide, and methanol are currently working on. The innovative and practical tail gas stepping recycling model of chemical companies in Shaanxi Province can not only recycle exhaust gas and reuse resources, but also achieve resource clean-up, solve environmental problems, reduce costs, and increase profits. These practices have been fully affirmed by relevant experts.
At the Shaanxi Provincial Meeting on Deep Processing of Energy Heavy Chemical Products held at the weekend, the vivid examples of Shaanxi Black Cat Coking Co., Ltd. and Xianyang Petrochemical Co., Ltd. were well received. Black cat coking uses coke oven gas as raw material to produce methanol and synthetic ammonia. After the technical transformation, it forms a new model for the production of methanol from methanol tail gas to produce synthetic ammonia and synthetic ammonia tail gas. Xianyang Petrochemical will use the refinery's analytical gas to produce methanol. Gas recovery and supply to refineries, production costs fell sharply. Due to the multiple recycling of industrial exhaust gas, the methanol cost of these two companies has been reduced to the lowest, becoming the only methanol profitable enterprise in Shaanxi Province.
Yan Yonghong, assistant general manager of black cat coking, told reporters that the coke oven gas methanol production project had been transformed since it was put into operation in February 2007, and the discharged methanol tail gas was sent back to the coke oven for heating, which increased the daily methanol production from 280 tons to 320 tons. However, taking into account the high content of hydrogen in the methanol off-gas, the coke oven combustion is not only a low calorific value waste of resources, but also caused the increase of coke oven exhaust emissions, environmental pressure. In December 2009, the black cat coking plant of 100,000 tons/year of synthetic ammonia was built and operated. The raw materials mainly come from the hydrogen produced in the methanol tail gas and the nitrogen produced by the methanol air separation unit, and the methanol and ammonia production systems share an air separation unit.
This year, the black cat coking and boldly implemented a technical transformation, the partial analytical gas of the ammonia production system was allocated to the methanol feed gas, the content of methane and carbon monoxide in the gas was increased, the methanol reaction conditions were optimized, and the methanol gas unit consumption was reduced. The saved coke oven gas is recycled to the ammonia production system. As a result, the daily production of methanol increased from 320 tons to 360 tons, which also solved the problem of analytical gas emissions. The annual economic benefits can be more than 10 million yuan.
In this way, the tail gas has been used multiple times and has been recycled in order to maximize the benefits of all available resources in the exhaust gas. At present, their methanol and ammonia production costs per ton are only 1350 yuan and 1,500 yuan respectively.
The 100,000-ton/year methanol project completed by Xianyang Petrochemical in July 2008 was originally designed with natural gas as raw material, and was later designed as a dual raw material system for natural gas and analytical gas. According to Gao Chaowen, deputy general manager of Xianyang Petrochemical, since the official supply of analytical gas in May last year, the company can use 255,000 to 297,000 cubic meters of analytical gas per day, reducing natural gas consumption by 65,000 to 75,000 cubic meters, and lowering the cost of methanol tons. About 150 yuan. At present, the analytic gas consumption of Xianyang Petrochemical accounts for about 1/2 of the methanol feedstock.
"When analyzing gas as a raw material for methanol production, it not only uses the hydrogen element therein, but also achieves chemical balance with natural gas." Gao Chaowen said that the production of methanol from natural gas has the problem of less hydrogen and more carbon, and excess hydrogen is generally emitted or used as fuel. . The analytical gas carbon dioxide content as high as 50%, matching the synthesis of methanol with hydrogen, reached the chemical balance.
The hydrogen content in the purge gas generated during methanol production is above 80% and it is not worthwhile as a fuel. Considering that Changqing Petrochemical's refining needs a large amount of hydrogen for cracking reactions to improve product quality and lighter quality of gasoline and diesel, Xianyang Petrochemical will supply gas directly to Changqing Petrochemical in May this year after its transformation. The methanol tonnage costs from 1700. Yuan Zhi fell to 1,200 yuan.
Yan Yonghong believes that despite this, the production system still has insufficient resources. Black cat coking will further tap the potential in the next step: 2.5 MPa intermediate pressure steam will be converted into superheated steam through the methanol production system to generate electricity. The consumption of tons of methanol is expected to reduce 300 kWh; CO2 in the gas after pressure swing adsorption After the products are extracted and produced, all the coke oven gas produces methanol. The actual production capacity of methanol can be expanded to more than 120,000 tons, and the cost will be further reduced.
Hu Haifeng, deputy inspector of the Shaanxi Provincial Department of Industry and Information Technology, gave a high evaluation of the practice of black cat coking and Xianyang Petrochemical. In recent years, the emission of air pollutants has been significantly reduced in Shaanxi Province, and the air quality has improved significantly. It is ultimately due to the fact that chemical companies are actively exploring the development mode of circular economy. "To achieve sustainable and healthy development of the modern coal chemical industry, we must establish a new concept and use the new model of industrial chain, comprehensive utilization of the "three wastes", and cross-industry coupling to make the best use of resources," Hu Haifeng told reporters.
At the Shaanxi Provincial Meeting on Deep Processing of Energy Heavy Chemical Products held at the weekend, the vivid examples of Shaanxi Black Cat Coking Co., Ltd. and Xianyang Petrochemical Co., Ltd. were well received. Black cat coking uses coke oven gas as raw material to produce methanol and synthetic ammonia. After the technical transformation, it forms a new model for the production of methanol from methanol tail gas to produce synthetic ammonia and synthetic ammonia tail gas. Xianyang Petrochemical will use the refinery's analytical gas to produce methanol. Gas recovery and supply to refineries, production costs fell sharply. Due to the multiple recycling of industrial exhaust gas, the methanol cost of these two companies has been reduced to the lowest, becoming the only methanol profitable enterprise in Shaanxi Province.
Yan Yonghong, assistant general manager of black cat coking, told reporters that the coke oven gas methanol production project had been transformed since it was put into operation in February 2007, and the discharged methanol tail gas was sent back to the coke oven for heating, which increased the daily methanol production from 280 tons to 320 tons. However, taking into account the high content of hydrogen in the methanol off-gas, the coke oven combustion is not only a low calorific value waste of resources, but also caused the increase of coke oven exhaust emissions, environmental pressure. In December 2009, the black cat coking plant of 100,000 tons/year of synthetic ammonia was built and operated. The raw materials mainly come from the hydrogen produced in the methanol tail gas and the nitrogen produced by the methanol air separation unit, and the methanol and ammonia production systems share an air separation unit.
This year, the black cat coking and boldly implemented a technical transformation, the partial analytical gas of the ammonia production system was allocated to the methanol feed gas, the content of methane and carbon monoxide in the gas was increased, the methanol reaction conditions were optimized, and the methanol gas unit consumption was reduced. The saved coke oven gas is recycled to the ammonia production system. As a result, the daily production of methanol increased from 320 tons to 360 tons, which also solved the problem of analytical gas emissions. The annual economic benefits can be more than 10 million yuan.
In this way, the tail gas has been used multiple times and has been recycled in order to maximize the benefits of all available resources in the exhaust gas. At present, their methanol and ammonia production costs per ton are only 1350 yuan and 1,500 yuan respectively.
The 100,000-ton/year methanol project completed by Xianyang Petrochemical in July 2008 was originally designed with natural gas as raw material, and was later designed as a dual raw material system for natural gas and analytical gas. According to Gao Chaowen, deputy general manager of Xianyang Petrochemical, since the official supply of analytical gas in May last year, the company can use 255,000 to 297,000 cubic meters of analytical gas per day, reducing natural gas consumption by 65,000 to 75,000 cubic meters, and lowering the cost of methanol tons. About 150 yuan. At present, the analytic gas consumption of Xianyang Petrochemical accounts for about 1/2 of the methanol feedstock.
"When analyzing gas as a raw material for methanol production, it not only uses the hydrogen element therein, but also achieves chemical balance with natural gas." Gao Chaowen said that the production of methanol from natural gas has the problem of less hydrogen and more carbon, and excess hydrogen is generally emitted or used as fuel. . The analytical gas carbon dioxide content as high as 50%, matching the synthesis of methanol with hydrogen, reached the chemical balance.
The hydrogen content in the purge gas generated during methanol production is above 80% and it is not worthwhile as a fuel. Considering that Changqing Petrochemical's refining needs a large amount of hydrogen for cracking reactions to improve product quality and lighter quality of gasoline and diesel, Xianyang Petrochemical will supply gas directly to Changqing Petrochemical in May this year after its transformation. The methanol tonnage costs from 1700. Yuan Zhi fell to 1,200 yuan.
Yan Yonghong believes that despite this, the production system still has insufficient resources. Black cat coking will further tap the potential in the next step: 2.5 MPa intermediate pressure steam will be converted into superheated steam through the methanol production system to generate electricity. The consumption of tons of methanol is expected to reduce 300 kWh; CO2 in the gas after pressure swing adsorption After the products are extracted and produced, all the coke oven gas produces methanol. The actual production capacity of methanol can be expanded to more than 120,000 tons, and the cost will be further reduced.
Hu Haifeng, deputy inspector of the Shaanxi Provincial Department of Industry and Information Technology, gave a high evaluation of the practice of black cat coking and Xianyang Petrochemical. In recent years, the emission of air pollutants has been significantly reduced in Shaanxi Province, and the air quality has improved significantly. It is ultimately due to the fact that chemical companies are actively exploring the development mode of circular economy. "To achieve sustainable and healthy development of the modern coal chemical industry, we must establish a new concept and use the new model of industrial chain, comprehensive utilization of the "three wastes", and cross-industry coupling to make the best use of resources," Hu Haifeng told reporters.
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