Recently, with the opening of the urea No.1 hydrocyclone pump, the vacuum device was successfully integrated into the evaporation system. This marked the successful start of a urea-based vacuum system reform project of Zhejiang Jinju Chemical Co., Ltd., another energy-saving technological transformation project. After the retrofit unit is put into operation, the water injection instead of the original steam injection not only saves about 40 kg of steam for tons of urea, but also recycles the residual ammonia and urea to achieve a win-win goal of energy saving and environmental protection. Zhejiang Jin Ju Chemical Co., Ltd. urea production evaporation system requires vacuum operation, steam jet pump has been used before the device out of the condensable gas, and then to the exhaust tube directly to vent. This not only consumes a lot of steam, but also the direct discharge of non-condensable gas contains a certain concentration of ammonia and urea, causing air pollution. In response to this situation, the company decided to implement a urea vacuum system. They learn from the mature technology of hydro-injection instead of steam injection, to ensure the first and second stage of vacuum evaporation in urea production. Uncondensable gas and circulating liquid into the circulation tank, which ammonia is absorbed, the inert gas to the atmosphere. Through the transformation, the company can save tons of urea steam 40 kilograms a year for the enterprise energy-saving and efficiency of more than 300,000 yuan.
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