Re-upgrade of thermal phosphoric acid total heat recovery technology

　　Sinochem New Net News Recently, led by Professor Mei Yi from Kunming University of Science and Technology, a scientific research team was formed in conjunction with Yunnan Chemical Industry Research Institute, Tsinghua University, Zhejiang University, Changzhou University, Zhejiang Chengtai Chemical Machinery Co.
, Ltd.
, and successfully developed the third Total heat energy recovery technology for the production process of thermal phosphoric acid
.
According to the calculation of various indicators, the heat recovery and utilization efficiency of this technology will reach about 87%
.

The picture shows the technical application case
.

　　Mei Yi introduced that the technology took more than 20 years from the first generation to the third generation
.
Through theoretical analysis, numerical simulation calculation and industrialization experiments, the scientific research team systematically carried out research on the production principle, anti-corrosion mechanism, process control technology, and key equipment structure of the yellow phosphorus combustion process, and developed a thermal phosphoric acid total heat recovery technology for by-product industrial steam.
, forming a series of industrialized special phosphorus-burning tower design standards and thermal phosphoric acid total heat recovery process
.

　　The design of a 90,000-ton/year complete plant using the third-generation thermal phosphoric acid total thermal energy recovery technology has been completed.
It is expected that after the completion of the plant in January 2023, it will be put into operation in a large thermal phosphoric acid production base in Guizhou
.

　　According to He Jinlin, general manager of Zhejiang Chengtai Chemical Machinery Co.
, Ltd.
, the manufacturer of the key equipment of this technology, compared with the first generation, the third-generation thermal phosphoric acid plant has been designed with standardized and finalized engineering, and the maximum production capacity of a single set of phosphoric acid is 7.
5 10,000 tons/year to 100,000 tons/year
.
In addition, the special phosphorus combustion tower of the device adopts a conical heat exchanger, and an upper convection heat exchanger is added to recover the hydration heat energy, so that the heat energy recovered from the upper, middle and lower parts of the special phosphorus combustion tower and the low-level heat energy generated by hydration are recovered.
The industrial steam of the same pressure is recovered in the same drum, the heat recovery efficiency is increased from 55% to 87% of the heat energy of yellow phosphorus combustion, and the pressure of the by-product steam is increased from less than 1.
0 MPa to 3.
5 MPa
.

　　Compared with the second-generation device, the third-generation thermal phosphoric acid heat energy recovery device has added a gas conduit and a hydration tower heat energy recovery device to the special phosphorus-burning tower
.
The 15,000-ton/year thermal phosphoric acid production plant using the second-generation technology was put into operation in a thermal phosphoric acid production base in Kunming, Yunnan in September 2016.
The thermal energy recovery and utilization efficiency has increased from 50% to 55% of the first generation to around 75%
.
In 2020, the 80,000-ton/year special phosphorus burning tower was put into operation in a phosphorus chemical company in Taixing, and has been running stably for more than a year
.

　　Up to now, this series of technologies has been transferred to 69 units of 46 companies at home and abroad.
At the same time, the equipment phosphorus burning tower has been popularized and applied in electronic-grade phosphoric acid and phosphorus pentoxide units, and exported to South Korea, Malaysia, Vietnam and other places
.
The technology has obtained 12 invention patents and 6 utility model patents
.