In recent years, with the gradual improvement of environmental protection requirements, sewage treatment and hazardous waste disposal in chemical parks have not only become a compulsory course for the park, but also a threshold for restricting the development of the park. The high cost of organic waste treatment and the lack of corresponding organic wastewater treatment technology have forced the chemical park to limit production or stop production, which has also had a negative impact on the healthy development of the chemical industry.
At the beginning of April, at the on-site meeting of the “Nuclear Coal Slurry Gasification Co-processing Waste Technology†held by the China Nitrogen Fertilizer Industry Association in Lanxi, Zhejiang, Gu Zongqin, chairman of the China Nitrogen Fertilizer Industry Association, pointed out that “coal slurry gasification co-processing waste technology†is not only It can dispose of chemical production wastewater, realize resource utilization of hazardous waste, produce ammonia water used in environmental protection, and hydrogen, liquid ammonia, carbon dioxide and other raw materials required by the chemical industry to realize recycling in chemical parks, which can effectively solve the problem of chemical industry parks. Difficulties in sewage treatment and hazardous waste disposal.
Cao Zhangao, chief engineer of China Nitrogen Fertilizer Industry Association, said that the “coal slurry gasification co-processing waste technology†will utilize high-concentration wastewater resources, so that the coal-water slurry gasification plant not only undertakes the task of environmental management of the park, but also recycles high-concentration wastewater. use efficiently. At the same time, the chemical products produced by the device can be sold back to the waste-producing enterprises in the upper reaches of the park as raw materials. For example, the combined ammonia and liquid ammonia are used as raw materials for ammonia desulfurization and denitrification of the boiler in the park, which reduces the emission of atmospheric pollution; the air separation unit and the gasification unit can supply raw materials such as pure oxygen, liquid nitrogen, high purity hydrogen and carbon dioxide to the park. . This not only provides an effective way for the treatment of high-concentration organic wastewater in chemical parks, but also provides new development options for qualified nitrogen fertilizer enterprises. According to the experience of Fengdeng Environmental Protection, the treatment of high-concentration organic wastewater by coal-water slurry gasifier basically does not increase the production cost of the enterprise, and can also save the industrial water consumption.
According to Shen Xihui, Secretary of the Board of Zhejiang Fengdeng Environmental Protection Co., Ltd., the technology utilizes the technical characteristics of reducing atmosphere, high temperature melting and rapid chilling of coal-water slurry gasifier, and finally transforms the organic matter in the waste into CO and H2. Synthetic feedstock gas for the production of high-purity hydrogen, pure ammonia, methanol and its derivatives, natural gas, clean fuel oil and other bulk chemicals or used directly as a clean fuel gas. While meeting the normal safety production of the enterprise, ensuring product quality and environmental protection, it realizes the harmless disposal and resource utilization of waste.
After more than ten years of technology research and development, project construction and project operation, Fengdeng Environmental has accumulated strong technical strength and operational experience in technical equipment and product standards, and has achieved many innovative breakthroughs. First, over the past five years, the annual processing capacity of hazardous waste in coal-water slurry gasifiers has been increasing. The annual disposal capacity of Zhejiang Fengdeng environmentally-friendly coal-water slurry gasifier unit can reach 86,400 tons/year, with an annual coal saving of about 9,600 tons, saving about 35,000 tons of pulping water and saving about 18,000 tons of process water. At the same time, it generates hydrogen of 11.3 million m3/year and liquid carbon dioxide of 20,000 tons/year.
The second is to continuously improve the safety production and environmental protection capabilities in the face of increasingly complex waste components. The influence of changes in wastewater composition on the production process and safe operation of coal water slurry, such as salt in wastewater containing CL-1, Na+1, F-1, will cause corrosion to equipment, which will cause hidden dangers to production and safety. According to a large number of actual operational data, Fengdeng Environmental Protection has established a control standard for inorganic salt content in wastewater. Especially in the treatment of F-, there is a new practice to convert F- into CaF2 (fluorite) and vitrification, which greatly reduces the damage of F- to the environment, especially the ozone layer.
The third is to continuously increase the types of solid waste that can be treated through process improvement. According to practice, this technology can handle hazardous wastes, including medical waste, pesticide waste, refined (steamed) residue, organic resin waste and waste alkali. Up to now, Fengdeng Environmental Protection has obtained 6 national invention patents and 30 utility model patents, forming an environmental protection industrial chain that utilizes “gasification furnace comprehensive utilization waste technology†to treat various types of waste, providing green development for the national chemical industry. The technology is paving the way.
According to reports, the localization rate of the core gasification equipment of the technology is 100%, the synthesis gas CO+H2 produced by gasification is over 90%, the vitrified molten slag by-product contains more than 95% of vitrification, dioxin content and heavy metal leaching. Toxicity is far below national standards. At present, the three sets of equipment that the company has completed have obtained hazardous waste business licenses. The operation scope of Zhejiang equipment covers 12 major categories, and the annual disposal scale is 86,400 tons. The Shaoxing installation obtained the “Hazardous Waste Management License†in 2017. The scope covers 9 categories, with an annual disposal scale of 50,000 tons; Ningbo Siming's business scope covers 8 categories, with an annual disposal scale of 40,000 tons. The total annual hazardous waste capacity of Zhejiang and Shaoxing plants can reach 180,000 tons, with an annual output of 50 million square meters (99.999%) of high-purity hydrogen, 10,000 tons of methanol and 80,000 tons of liquid ammonia. The combined income in 2018 is 550 million yuan. The net profit was 100 million yuan and the tax paid was 34 million yuan, which produced huge economic benefits.
Gu Zongqin said that there are currently 448 coal-water slurry gasifiers in China, of which 292 have been put into operation and 156 are under construction. The production capacity of synthetic ammonia has been 12.78 million tons/year, 88 gasifiers; the synthetic ammonia production capacity is 6.295 million tons/year, 37 gasification furnaces are underway; the methanol production capacity has reached 31.79 million tons/year, and 162 gasifiers are under construction; The methanol production capacity is 8.59 million tons/year and the gasification furnace is 29 units. And most of them are built in chemical parks. If Fengdeng Environmental Protection produces 50,000 tons of high-concentration wastewater per year, the existing high-concentration wastewater can be processed up to 22 million tons per year; if it is capable of blending 2 tons per ton of ammonia capacity The waste calculation can burn more than 80 million tons of waste each year. If we add a new coal-water slurry gasifier in the new coal chemical industry in recent years, the maximum processing capacity will at least double, and the environmental protection potential is enormous. For a large number of chemical parks, it is more important to plan to incinerators if combined with nitrogen fertilizer and methanol production.
Gu Zongqin also pointed out that there are still some problems in the technology, such as the problem of heavy metal pollution after treatment of organic wastewater by using coal water slurry technology, whether it can be mixed with organic waste gas and VOC by gasifier, and pretreatment of hazardous waste water. And how to standardize and standardize the secondary treatment and how to take advantage of the enthusiasm of the large-scale coal-water slurry plant to treat high-concentration organic wastewater to undertake environmental protection and social responsibility.
In this regard, Zhejiang Fengdeng Environmental Protection Co., Ltd. said that it will carry out in-depth cooperation with professional research institutes such as China Academy of Environmental Sciences, Northwest Research Institute of Chemical Industry and Zhejiang University to achieve technological innovation and breakthrough.
At the beginning of April, at the on-site meeting of the “Nuclear Coal Slurry Gasification Co-processing Waste Technology†held by the China Nitrogen Fertilizer Industry Association in Lanxi, Zhejiang, Gu Zongqin, chairman of the China Nitrogen Fertilizer Industry Association, pointed out that “coal slurry gasification co-processing waste technology†is not only It can dispose of chemical production wastewater, realize resource utilization of hazardous waste, produce ammonia water used in environmental protection, and hydrogen, liquid ammonia, carbon dioxide and other raw materials required by the chemical industry to realize recycling in chemical parks, which can effectively solve the problem of chemical industry parks. Difficulties in sewage treatment and hazardous waste disposal.
Cao Zhangao, chief engineer of China Nitrogen Fertilizer Industry Association, said that the “coal slurry gasification co-processing waste technology†will utilize high-concentration wastewater resources, so that the coal-water slurry gasification plant not only undertakes the task of environmental management of the park, but also recycles high-concentration wastewater. use efficiently. At the same time, the chemical products produced by the device can be sold back to the waste-producing enterprises in the upper reaches of the park as raw materials. For example, the combined ammonia and liquid ammonia are used as raw materials for ammonia desulfurization and denitrification of the boiler in the park, which reduces the emission of atmospheric pollution; the air separation unit and the gasification unit can supply raw materials such as pure oxygen, liquid nitrogen, high purity hydrogen and carbon dioxide to the park. . This not only provides an effective way for the treatment of high-concentration organic wastewater in chemical parks, but also provides new development options for qualified nitrogen fertilizer enterprises. According to the experience of Fengdeng Environmental Protection, the treatment of high-concentration organic wastewater by coal-water slurry gasifier basically does not increase the production cost of the enterprise, and can also save the industrial water consumption.
According to Shen Xihui, Secretary of the Board of Zhejiang Fengdeng Environmental Protection Co., Ltd., the technology utilizes the technical characteristics of reducing atmosphere, high temperature melting and rapid chilling of coal-water slurry gasifier, and finally transforms the organic matter in the waste into CO and H2. Synthetic feedstock gas for the production of high-purity hydrogen, pure ammonia, methanol and its derivatives, natural gas, clean fuel oil and other bulk chemicals or used directly as a clean fuel gas. While meeting the normal safety production of the enterprise, ensuring product quality and environmental protection, it realizes the harmless disposal and resource utilization of waste.
After more than ten years of technology research and development, project construction and project operation, Fengdeng Environmental has accumulated strong technical strength and operational experience in technical equipment and product standards, and has achieved many innovative breakthroughs. First, over the past five years, the annual processing capacity of hazardous waste in coal-water slurry gasifiers has been increasing. The annual disposal capacity of Zhejiang Fengdeng environmentally-friendly coal-water slurry gasifier unit can reach 86,400 tons/year, with an annual coal saving of about 9,600 tons, saving about 35,000 tons of pulping water and saving about 18,000 tons of process water. At the same time, it generates hydrogen of 11.3 million m3/year and liquid carbon dioxide of 20,000 tons/year.
The second is to continuously improve the safety production and environmental protection capabilities in the face of increasingly complex waste components. The influence of changes in wastewater composition on the production process and safe operation of coal water slurry, such as salt in wastewater containing CL-1, Na+1, F-1, will cause corrosion to equipment, which will cause hidden dangers to production and safety. According to a large number of actual operational data, Fengdeng Environmental Protection has established a control standard for inorganic salt content in wastewater. Especially in the treatment of F-, there is a new practice to convert F- into CaF2 (fluorite) and vitrification, which greatly reduces the damage of F- to the environment, especially the ozone layer.
The third is to continuously increase the types of solid waste that can be treated through process improvement. According to practice, this technology can handle hazardous wastes, including medical waste, pesticide waste, refined (steamed) residue, organic resin waste and waste alkali. Up to now, Fengdeng Environmental Protection has obtained 6 national invention patents and 30 utility model patents, forming an environmental protection industrial chain that utilizes “gasification furnace comprehensive utilization waste technology†to treat various types of waste, providing green development for the national chemical industry. The technology is paving the way.
According to reports, the localization rate of the core gasification equipment of the technology is 100%, the synthesis gas CO+H2 produced by gasification is over 90%, the vitrified molten slag by-product contains more than 95% of vitrification, dioxin content and heavy metal leaching. Toxicity is far below national standards. At present, the three sets of equipment that the company has completed have obtained hazardous waste business licenses. The operation scope of Zhejiang equipment covers 12 major categories, and the annual disposal scale is 86,400 tons. The Shaoxing installation obtained the “Hazardous Waste Management License†in 2017. The scope covers 9 categories, with an annual disposal scale of 50,000 tons; Ningbo Siming's business scope covers 8 categories, with an annual disposal scale of 40,000 tons. The total annual hazardous waste capacity of Zhejiang and Shaoxing plants can reach 180,000 tons, with an annual output of 50 million square meters (99.999%) of high-purity hydrogen, 10,000 tons of methanol and 80,000 tons of liquid ammonia. The combined income in 2018 is 550 million yuan. The net profit was 100 million yuan and the tax paid was 34 million yuan, which produced huge economic benefits.
Gu Zongqin said that there are currently 448 coal-water slurry gasifiers in China, of which 292 have been put into operation and 156 are under construction. The production capacity of synthetic ammonia has been 12.78 million tons/year, 88 gasifiers; the synthetic ammonia production capacity is 6.295 million tons/year, 37 gasification furnaces are underway; the methanol production capacity has reached 31.79 million tons/year, and 162 gasifiers are under construction; The methanol production capacity is 8.59 million tons/year and the gasification furnace is 29 units. And most of them are built in chemical parks. If Fengdeng Environmental Protection produces 50,000 tons of high-concentration wastewater per year, the existing high-concentration wastewater can be processed up to 22 million tons per year; if it is capable of blending 2 tons per ton of ammonia capacity The waste calculation can burn more than 80 million tons of waste each year. If we add a new coal-water slurry gasifier in the new coal chemical industry in recent years, the maximum processing capacity will at least double, and the environmental protection potential is enormous. For a large number of chemical parks, it is more important to plan to incinerators if combined with nitrogen fertilizer and methanol production.
Gu Zongqin also pointed out that there are still some problems in the technology, such as the problem of heavy metal pollution after treatment of organic wastewater by using coal water slurry technology, whether it can be mixed with organic waste gas and VOC by gasifier, and pretreatment of hazardous waste water. And how to standardize and standardize the secondary treatment and how to take advantage of the enthusiasm of the large-scale coal-water slurry plant to treat high-concentration organic wastewater to undertake environmental protection and social responsibility.
In this regard, Zhejiang Fengdeng Environmental Protection Co., Ltd. said that it will carry out in-depth cooperation with professional research institutes such as China Academy of Environmental Sciences, Northwest Research Institute of Chemical Industry and Zhejiang University to achieve technological innovation and breakthrough.
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