Ammonia / urea production water cleansing and recycling technology will be used to dry waste netting on January 4 from Fujian Zhisheng Chemical Co., Ltd. heard good news, the company's ammonia / urea production water clean reuse technology research project has just passed the science and technology of Fujian Province Office of scientific and technological achievements appraisal. 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 clean production technologies for domestic small and medium-sized nitrogenous fertilizer companies, with significant energy saving and emission reduction effects.
It is included in the national pollution control and environmental protection special project for the comprehensive treatment of this nitrogen fertilizer production wastewater treatment environmental protection project, 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 once a year, saving 900,000 kilowatt hours of electricity, 1.879 million tons of wastewater, 118 tons of ammonia nitrogen, 23,600 tons of COD, and 404 tons of urea dust. Can generate 5.64 million yuan of economic benefits. Through comprehensive management, enterprises can use the exhaust gas and waste residue in the production process to get rid of the net, and the annual production cost can be reduced by more than 16 million yuan.
This technology has completed the research and equipment construction for the recovery of refined 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 gas stripping, trinity hydrolysis-desorption are adopted. Innovative technologies such as tower structure and high-efficiency mass transfer column internals enable urea ≤3.0×10-6 and ammonia ≤5.0×10-6 in the residual liquid discharge 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 the dust recovery technology of the urea prilling tower, and solved key technical problems such as efficient atomization and descaling of dust removal facilities. The annual recovery of urea is approximately 360 tons; the use of coagulation, settlement and The high-efficiency sewage purification technology integrated with filtration has realized the closed circuit circulation of 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 the comprehensive treatment of this nitrogen fertilizer production wastewater treatment environmental protection project, 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 once a year, saving 900,000 kilowatt hours of electricity, 1.879 million tons of wastewater, 118 tons of ammonia nitrogen, 23,600 tons of COD, and 404 tons of urea dust. Can generate 5.64 million yuan of economic benefits. Through comprehensive management, enterprises can use the exhaust gas and waste residue in the production process to get rid of the net, and the annual production cost can be reduced by more than 16 million yuan.
This technology has completed the research and equipment construction for the recovery of refined 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 gas stripping, trinity hydrolysis-desorption are adopted. Innovative technologies such as tower structure and high-efficiency mass transfer column internals enable urea ≤3.0×10-6 and ammonia ≤5.0×10-6 in the residual liquid discharge 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 the dust recovery technology of the urea prilling tower, and solved key technical problems such as efficient atomization and descaling of dust removal facilities. The annual recovery of urea is approximately 360 tons; the use of coagulation, settlement and The high-efficiency sewage purification technology integrated with filtration has realized the closed circuit circulation of 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%.
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