On January 4, Fujian Zhisheng Chemical Co., Ltd. received good news. The company's synthetic ammonia/urea production water reuse technology research project has just passed the scientific and technological achievements appraisal organized by the Science and Technology Department of Fujian Province. Experts believe that this technology, which is at the leading level in the domestic industry, will play an exemplary role in the research and application of systematic cleaner production technologies for domestic small and medium-sized nitrogen fertilizer companies, with significant energy saving and emission reduction effects.
It is included in the national pollution control and environmental protection special project for this comprehensive treatment of waste water from nitrogen fertilizer production and environmental protection projects, with a total investment of 11.73 million yuan. Through more than two years of implementation, the technology has been used in the treatment of gasification wastewater, ammonia-containing wastewater concentration, deep hydrolysis of urea process condensate, raw water purification treatment, reformation of circulating cooling water system, construction of wastewater on-line monitoring system, dust recovery treatment of granulation towers Such areas have achieved good results, saving nearly one million yuan in water consumption per year, saving 900,000 kilowatt-hours, 1.879 million tons of wastewater, 118 tons of ammonia nitrogen, 23,600 tons of COD, and 404 tons of urea dust. Each year, it can generate 5.64 million yuan of economic benefits. Through comprehensive management, enterprises can use the exhaust gas and waste residues in the production process to get rid of the net, which can reduce production costs by more than 16 million yuan.
The technology has completed the research and equipment construction for the recovery and recovery of refined regeneration gas, and has many advantages: recycling of ammonia, CO and other active components in the regeneration gas, solving the problem of nozzle opening in synthetic ammonia refining process, and improving the regeneration of copper liquor. Efficiency; The amount of ammonia in the system is reduced, saving ammonia about 0.26kg/tNH3; The introduction and innovative application of urea raffinate low pressure carbon dioxide stripping hydrolysis technology is completed; 1.1MPa low pressure steam hydrolysis, carbon dioxide stripping, trinity hydrolysis - Innovative technologies such as desorption tower structure and high-efficiency mass transfer column internals enable urea ≤3.0×10-6 and ammonia ≤5.0×10-6 in the residual concentration, which can be used as a substitute for low pressure deep hydrolysis technology abroad. .
In addition, Zhisheng Chemical also completed the research and equipment construction of dust recovery technology for urea prilling towers, solved key technical problems such as high-efficiency atomization and dust removal facility descaling. The annual recoverable urea is about 360 tons; the use of coagulation, settlement and The filtration and integration of high-efficiency sewage purification technology have realized the closed-circuit circulation of the dust-removing and cooling water in the gas generation and desulphurization process; the self-developed automatic control device has been adopted to solve the problem of gasless water use in the original gas scrubber, reducing water consumption by approximately 20%. , Cooling water recycling rate of more than 99%.
It is included in the national pollution control and environmental protection special project for this comprehensive treatment of waste water from nitrogen fertilizer production and environmental protection projects, with a total investment of 11.73 million yuan. Through more than two years of implementation, the technology has been used in the treatment of gasification wastewater, ammonia-containing wastewater concentration, deep hydrolysis of urea process condensate, raw water purification treatment, reformation of circulating cooling water system, construction of wastewater on-line monitoring system, dust recovery treatment of granulation towers Such areas have achieved good results, saving nearly one million yuan in water consumption per year, saving 900,000 kilowatt-hours, 1.879 million tons of wastewater, 118 tons of ammonia nitrogen, 23,600 tons of COD, and 404 tons of urea dust. Each year, it can generate 5.64 million yuan of economic benefits. Through comprehensive management, enterprises can use the exhaust gas and waste residues in the production process to get rid of the net, which can reduce production costs by more than 16 million yuan.
The technology has completed the research and equipment construction for the recovery and recovery of refined regeneration gas, and has many advantages: recycling of ammonia, CO and other active components in the regeneration gas, solving the problem of nozzle opening in synthetic ammonia refining process, and improving the regeneration of copper liquor. Efficiency; The amount of ammonia in the system is reduced, saving ammonia about 0.26kg/tNH3; The introduction and innovative application of urea raffinate low pressure carbon dioxide stripping hydrolysis technology is completed; 1.1MPa low pressure steam hydrolysis, carbon dioxide stripping, trinity hydrolysis - Innovative technologies such as desorption tower structure and high-efficiency mass transfer column internals enable urea ≤3.0×10-6 and ammonia ≤5.0×10-6 in the residual concentration, which can be used as a substitute for low pressure deep hydrolysis technology abroad. .
In addition, Zhisheng Chemical also completed the research and equipment construction of dust recovery technology for urea prilling towers, solved key technical problems such as high-efficiency atomization and dust removal facility descaling. The annual recoverable urea is about 360 tons; the use of coagulation, settlement and The filtration and integration of high-efficiency sewage purification technology have realized the closed-circuit circulation of the dust-removing and cooling water in the gas generation and desulphurization process; the self-developed automatic control device has been adopted to solve the problem of gasless water use in the original gas scrubber, reducing water consumption by approximately 20%. , Cooling water recycling rate of more than 99%.