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Energy saving type phosphorus reaction tower for producing high pure phosphoric acid

A high-purity phosphoric acid and energy-saving technology, applied in the field of reaction towers, can solve problems such as the inability to fundamentally inhibit corrosion, and achieve the effects of improving the effective heat utilization rate of the system, facilitating processing and manufacturing, and taking into account equipment economy.

Inactive Publication Date: 2006-11-08
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

The equipment has strict requirements on the moisture content of the air entering the tower, only when H 2 O and P 2 o 5 When the molar ratio of phosphate is maintained between 0.6 and 0.9, a super-phosphoric acid protective film will be formed on the metal wall, but this super-phosphoric acid protective film itself is also corrosive, so it cannot fundamentally inhibit corrosion

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  • Energy saving type phosphorus reaction tower for producing high pure phosphoric acid

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Embodiment Construction

[0015] As shown in the accompanying drawings, the present invention includes a closed vertical tower body 1 , a steam-water separator 2 , a steam collecting pipe 3 , a downcomer 4 and a skirt base 5 . The surrounding wall of the airtight vertical tower body 1 is an annular membrane water cooling wall 1.3 formed by welding multiple stainless steel tubes and fins at intervals. There is a flue gas outlet pipe 1.1 at the end of the conical head 1.2, and the lower end of the annular membrane water wall 1.3 is connected with the lower header 1.7 and the lower conical head 1.4 in sequence; The interface pipe 1.6 of the phosphorus spray gun, the bottom of the closed vertical tower body 1 is a skirt base 5 connected with the lower header 1.7, the two ends of the steam collecting pipe 3 are respectively connected with the steam-water separation device 2 and the upper header 1.5, and the downcomer 4 is two The ends are respectively connected with the steam-water separation device 2 and t...

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Abstract

The present invention discloses a kind of energy saving phosphorus reaction tower for producing high purity phosphoric acid. The vertical sealed tower has ring film type water cooling wall formed with stainless steel pipes and finned sheets through welding, upper header tank and upper conic end with fume outlet connected to the upper end of the ring film type water cooling wall, lower header tank and lower conic end connected to the lower end of the ring film type water cooling wall, inclined phosphorus spraying gun mouth piece in the lower part, apron type pedestal connected to the lower header tank, steam collector connected between the steam-water separator and the upper header tank, down take connected between the steam-water separator and the lower header tank, and the steam-water separator with steam outlet pipe and cold water inlet pipe. The present invention realizes the afterheat recovery of phosphoric acid producing process, and has high heat efficiency and phosphoric acid as high as 99 %.

Description

technical field [0001] The invention relates to a reaction tower, in particular to an energy-saving phosphorus reaction tower for producing high-purity phosphoric acid. Background technique [0002] In recent years, with the development of industry and the improvement of people's living standards, the demand for high-purity phosphoric acid is increasing. However, the current high-purity phosphoric acid production, in order to slow down the P 2 o 5 The high-temperature flue gas corrodes the equipment. The surrounding walls of the phosphorus combustion towers used are equipped with upper and lower water-cooled jackets to reduce the wall temperature. Usually the inlet circulating water temperature of the jacket is about 35°C, and the outlet water temperature is about 50-55°C. This kind of low-temperature waste heat cannot be used in industry. Instead, a huge plate heat exchanger and an additional steam boiler must be configured to cool the circulating water and melt solid ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/16
Inventor 蒋家羚刘宝庆陈凌
Owner ZHEJIANG UNIV
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