For the production of dihydrate wet phosphoric acid at home and abroad, the relevant process of original condensed water circulation is: after the gas evaporated from the extraction flash cooler and the concentration flash chamber is washed in the two-stage fluorine absorption tower, the remaining The water vapor is condensed through the condenser, enters the hot water tank, flows into the ditch and underground tank, and is then pumped to the cold water tower by the hot water pump. After being cooled by the blast, the cold water pump is sent back to the condenser for recycling. The production process is long and requires a lot of equipment. The process flow is shown in Figure 1. Figure 1 Before improvement, cooling water circulation flow chart for the production of dihydrate wet phosphoric acid. The main problems of the condensate water circulation process commonly used at home and abroad are: hot water pumps have many operating failures, high operation and maintenance costs, and large power consumption. Analysis suggests that the process of directly returning hot water to the cooling tower through pipelines can be used. That is, if the height of the hot water tank is appropriately raised, the water outlet from the hot water tank can be automatically siphoned into the cooling tower for cooling based on the position difference. The cold water pump uses a chemical corrosion-resistant pump with large flow rate and high lift, which further saves operation and maintenance costs and enables the cold water pump to be arranged in the +0.00m plane. In this way, the layout of the entire circulating water device is compact and reasonable, occupying a small area and saving investment.
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