New thermal phosphoric acid production technology saves energy and reduces emissions
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The Institute of Chemical Industry of Yunnan Province focused on the current status of the thermal phosphoric acid production technology. In the past 12 years, it has invented a set of pyro-phosphoric acid production technology that uses natural air to burn yellow phosphorus to recover the by-product industrial steam. And developed the key equipment of the technology: a special fuel tower. This technology has six major advantages: First, the realization of heat energy recovery and utilization, thermal energy recovery rate of 65.2%%; Second, reduce circulating cooling water 60%; Third, reduce the cycle acid amount 50%; Fourth, water The absorption rate of P2O5 in the chemical tower is increased by 30%. Fifth, a new-scale production device of the same scale is used to reduce the investment by 20%. Sixth, the original traditional production device is transformed and the production capacity is increased by 30%. The invention is still the only domestic and international industrial technology that uses ordinary natural air to burn yellow phosphorus and generate steam. The actual heat energy recovery rate is as high as 65.2%, which not only breaks through the limit of 63% of the average natural air theory recovery reported in foreign literature, but also exceeds the actual utilization of dry heat energy in foreign countries.
The thermal energy produced by the yellow phosphorus combustion in the traditional thermal process phosphoric acid production process is difficult to be further utilized. However, in the production system, the phosphorus phosphating and phosphorus supply equipment and their associated pipelines need to be additionally provided with coal-fired boilers for heat insulation, and the production system needs to be formed. The thermal energy generated by the external supply of heat and generated by itself cannot be used as an irrational cause of waste. Therefore, the heat released from the recovery of yellow phosphorus combustion is a major technological innovation issue in the thermal process phosphoric acid industry.
“Yellow Phosphorus Combustion Heat Energy Recovery and Utilization Device and Thermal Phosphoric Acid Production System†was authorized by the national invention patent. The use of natural air in the production of thermal phosphoric acid at the same time as the by-product pressure of more than 0.8MPa industrial steam. The large-scale promotion and application of the industry has been achieved, the clean production level of the industry has been improved, and it has become the leading production technology of the industry. The transformation of traditional industries with high-tech has been an international advance to promote energy conservation, resource conservation, environmental protection, and sustainable development. technology.
The project implements technology transfer for 18 companies and 33 sets. In the past three years, the newly added output value of the project using this invention technology has reached 1.238 billion yuan, profits and taxes have increased by 245 million yuan, and total savings have reached 125 million yuan.