合成氨尿素企业低品位热能回收再利用改造探讨

Discussion on the Revamping of Low-Grade Heat Energy Recovery and Reuse in Ammonia and Urea Enterprises

分析了合成氨尿素生产过程能耗高的原因,结果表明,大量低压蒸汽被放空,温度约90℃左右的合成氨工艺冷凝液和尿素蒸汽冷凝热量没有被回收利用,同时采用新增取暖供热燃气锅炉,大量消耗高品位能源天然气,造成利用不充分、不合理。通过技术改造,充分回收以上低品位热能用于生产生活供热取暖,在实际运行中,取得了良好的经济效益,同时达到了节能降耗的目的。

This paper analyzes the reason of high energy consumption in ammonia and urea production process. The results show that the heat in the large amount of vented low pressure steam, ammonia process condensate and urea steam condensation at about 90 ℃ is not recovered for utilization. At the same time the newly-added heating-purpose gas-fired boiler consumes a large quantity of high-grade natural gas and results in inadequate and unreasonable utilization. Through technical upgrading, the above low-grade heat energy is fully recovered for production and living heating. As a result, good economic return and energy saving and consumption reduction are achieved.