Shandong Zibo Qilu First Fertilizer Co., Ltd. has invested over 7 million yuan to upgrade its facilities, incorporating advanced energy conversion technologies to develop ammonia recovery systems for synthetic ammonia tail gas and gas recovery equipment. As China's first medium-sized nitrogen fertilizer plant to produce synthetic ammonia from oil refining byproducts, the company annually produces 120,000 tons of synthetic ammonia, 200,000 tons of urea, and 20,000 tons of methanol.
For many years, the challenge of handling tail gas—especially the release of purge gas—has been a major concern for the industry. This gas, which contains ammonia, methane, nitrogen, and hydrogen, is released when liquid ammonia is decompressed during the production process. Traditionally, nitrogen fertilizer companies have used water absorption methods to recover ammonia, but this approach lowers the value of the recovered product and consumes large amounts of steam.
In recent years, Qilu Chemical Fertilizer Co., Ltd. conducted extensive research and trials, investing heavily in modernizing its equipment. The new system breaks away from conventional methods by using high-tech energy converters and cryogenic technology to recover liquid ammonia without requiring external energy input. This innovative approach allows the company to extract ammonia from the purge gas and use it directly in the production of finished ammonia for urea, significantly improving efficiency.
This upgrade not only enhances the value of ammonia in the waste gas but also reduces water and electricity consumption while addressing environmental pollution. According to reports, before the installation of the new system, the ammonia content in the original gas was around 25%. After the system was put into operation, the ammonia content in the tail gas dropped to about 4%. The device can recover 3 to 4 tons of liquid ammonia daily, resulting in an annual efficiency increase of nearly 2 million yuan. This technological advancement marks a significant step forward in sustainable and efficient chemical production.
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