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Method and device for preparing thermal-process phosphoric acid and recovering thermal energy

A technology for recovering heat energy and thermal phosphoric acid, which is applied in the steam generation method using heat carrier, phosphoric acid, phosphorus oxyacid, etc. Considering the recovery of high-temperature exhaust heat energy and hydration reaction heat, etc., to achieve the effect of ensuring emission standards and saving economic costs

Active Publication Date: 2017-09-08
贵州东晟捷能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Invention patent CN201531862U yellow phosphorus combustion heat energy recovery device proposes a more secure yellow phosphorus combustion heat energy recovery device, which uses a certain gas as an intermediate heat exchange medium, which can effectively avoid phosphorus pentoxide caused by the rupture of boiler heat exchange exhaust pipes It reacts with soft water to generate phosphoric acid and corrodes equipment. The patent does not mention the recovery of heat of hydration and heat integration
[0006] Invention patent CN102910602A double-zone high-efficiency recovery of yellow phosphorus combustion heat energy device proposes a heat energy recovery device similar to a phosphorus-burning boiler, without considering the recovery of high-temperature tail gas heat energy and hydration reaction heat
[0007] Invention patent CN102556990A The device for absorbing the heat energy of yellow phosphorus combustion by heat-conducting oil proposes a device that uses heat-conducting oil for heat exchange and then releases heat. This invention needs to use heat-conducting oil as an intermediate heat-exchange medium, and does not mention the high-temperature tail gas heat energy of the device and recovery of heat of hydration reaction
The reaction is reflected in the reaction between phosphorus pentoxide and water, and the absorption of phosphorus pentoxide in the gas phase is released. The inlet of the gas phase material is a mixed gas of nitrogen, oxygen and gaseous phosphorus pentoxide, and the outlet is mainly nitrogen and oxygen. , the absorbent is mainly an aqueous solution containing phosphoric acid or polyphosphoric acid, and its outlet concentration is higher than that of the imported one. At present, there is no microreactor for this system. For this reason, the present invention introduces a microreactor into the process and proposes a suitable microreactor. Reactor characteristic size

Method used

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  • Method and device for preparing thermal-process phosphoric acid and recovering thermal energy
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  • Method and device for preparing thermal-process phosphoric acid and recovering thermal energy

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Every use 1 ton of yellow phosphorus, the quality of oxygen is 1.2 tons of the used yellow phosphorus quality, and described hydration agent is water or different P O The solution of mass fraction, the quality of water in the hydration agent is 0.29 tons of yellow phosphorus quality, The water quality used to prepare the saturated soft water is 1 ton of the yellow phosphorus quality, and the consumption of washing water is 0.29 tons of the yellow phosphorus quality.

[0040] For the microabsorber 2 used, the hydraulic radius of the parallel channel is 0.05mm, the radius of the dispersion hole is 0.01mm, the angle between the axis of the dispersion hole and the axis of the parallel channel is 20°, and the residence time of the material is 1s.

Embodiment 2

[0042] Every use 1 ton of yellow phosphorus, the quality of oxygen is 2.4 tons of the used yellow phosphorus quality, and described hydration agent is water or different P O The solution of mass fraction, the quality of water in the hydration agent is 3 tons of yellow phosphorus quality, The water quality used to prepare the saturated soft water is 10 tons of the yellow phosphorus quality, and the consumption of washing water is 3 tons of the yellow phosphorus quality.

[0043] For the micro-absorber 2 used, the hydraulic radius of the parallel channel is 5mm, the radius of the dispersion hole is 1mm, the angle between the axis of the dispersion hole and the axis of the parallel channel is 55°, and the residence time of the material is 30s

Embodiment 3

[0045] Every use 1 ton of yellow phosphorus, the quality of oxygen is 2.6 tons of the used yellow phosphorus quality, and described hydration agent is water or different P O The solution of mass fraction, the quality of water in the hydration agent is 6 tons of yellow phosphorus quality, The water quality used to prepare the saturated soft water is 20 tons of the yellow phosphorus quality, and the consumption of washing water is 6 tons of the yellow phosphorus quality.

[0046] For the micro-absorber 2 used, the hydraulic radius of the parallel channel is 10 mm, the radius of the dispersing hole is 2 mm, the angle between the axis of the dispersing hole and the axis of the parallel channel is 90°, and the residence time of the material is 60 s.

[0047] Through the tests of Examples 1, 2, and 3, the above-mentioned test data can have a relatively good test structure, which meets the production requirements of thermal phosphoric acid and is conducive to the generation of heat of...

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Abstract

The invention discloses a method and device for preparing thermal-process phosphoric acid and recovering thermal energy. The method is characterized in that a micro absorber absorbs reaction heat of hydration reaction; after passing through the micro absorber, the reaction heat is brought into a separation tank by a gas-liquid mixture; firstly, heat of a gas phase and heat of a liquid phase are respectively absorbed by tail gas heat recovering equipment and a strong phosphoric acid cooler; then, the heat of the gas phase and the heat of the liquid change is neutralized; finally, the heat is conveyed to an evaporation device of a yellow phosphorus boiler in a saturated soft water form to be steamed; the preparation of the phosphoric acid is realized; meanwhile, the heat can be recovered; the mass of oxygen gas in an oxidizing agent is 1.2 to 2.6 times of the mass of yellow phosphorus; a hydrated agent is water or solutions with different P2O5 mass percents; the mass of water in the hydrated agent is 0.29 to 6 times of the mass of yellow phosphorus; the mass of water of the prepared saturated soft water is 1 to 20 times of the mass of the yellow phosphorus. The method and the device have the advantages that the recovery rate of the combustion heat of the yellow phosphorus and the reaction head of phosphorus pentoxide can be improved; the energy sources are favorably saved; the production cost is effectively reduced.

Description

technical field [0001] The invention relates to a method for preparing thermal phosphoric acid and recovering heat energy and a device thereof, belonging to the technical field of phosphoric acid preparation and recovery and utilization of low-level heat energy. Background technique [0002] Phosphoric acid is an important chemical intermediate product and a common raw material for the synthesis of most phosphates and some phosphoric esters and other phosphorus-containing compounds. It is widely used in food, medicine, electronics, petroleum, metallurgy, chemical industry and other industries. According to the production process, the sources of phosphoric acid include wet process phosphoric acid and thermal process phosphoric acid. Wet-process phosphoric acid uses strong acid—usually sulfuric acid, but also nitric acid, hydrochloric acid, fluosilicic acid and phosphate rock to undergo metathesis reaction to obtain crude phosphoric acid with more impurities, which is generall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/20F22B1/18
CPCF22B1/18C01B25/20Y02P20/10
Inventor 杜强王邵东权晓威
Owner 贵州东晟捷能科技有限公司
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