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Nitrogen fertilizer companies meet the standard emission problems have solved the low pressure gas
Nitrogen fertilizer companies, which are concentrated around several major water systems in the country, are now facing production suspensions and rectification efforts due to excessive liquid discharge. According to a report from yesterday, Ningbo Far East Chemical Technology Co., Ltd. has successfully developed an independent ammonia and urea waste liquid processing system that effectively addresses the long-standing issue of difficult waste liquid disposal and environmental pollution common among nitrogen fertilizer enterprises. Once this technology is widely adopted, it could significantly impact smaller and medium-sized nitrogen fertilizer plants.
The technology employs deep hydrolysis of condensate from the urea production process, reducing the ammonia (NH3) and urea (Ur) content in the discharge solution to below 5×10-6. This system is currently being applied at several major chemical companies, including Shandong Yankuang Chemical Co., Ltd., Gansu Liuhua (Group) Co., Ltd., and Shandong Ruixing Chemical Group Co., Ltd. The operational results have fully met the design standards, achieving both significant economic returns and environmental benefits.
It is known that many urea plants built in the 1990s with annual capacities ranging from 40,000 to 150,000 tons were originally designed to treat process condensate using desorption towers. However, after production capacity exceeded the original design limits, the condensate treatment facilities remained largely unchanged. As a result, the ammonia and urea content in the residual solution discharged from these towers often far exceeded the original design values, posing serious environmental risks and increasing production costs, thus affecting corporate competitiveness.
Ningbo Yuandong Chemical Technology Co., Ltd. has developed independent technologies for the hydrolysis of urea process condensate, addressing key challenges faced by nitrogen fertilizer companies. These technologies, which have been granted national invention patents, include medium-pressure and low-pressure hydrolysis methods.
The low-pressure gas extraction and hydrolysis technology is especially suitable for urea plants that cannot use high-pressure steam. It integrates the hydrolysis tower and desorption tower into one unit, simplifying the process and operations without disrupting the original system. The investment required is relatively low, and the recovered ammonia, CO2, and H2O are returned to the urea medium pressure system as liquid, significantly reducing energy consumption and cold load. Combined with wastewater treatment from urea and ammonia plants, the technology offers broader applications.
For example, a 240,000-ton-per-year urea plant that implemented this technology generated an additional 2.5 million yuan in annual profit, with full investment recovery within about two years. Currently, five units of the deep hydrolysis system developed by Ningbo Far East Company are already in operation in China, with 12 more under construction.