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Thermal process phosphoric acid full heat energy recovery system

A technology of heat energy recovery and thermal phosphoric acid, which is applied in the field of phosphorus chemical industry, can solve the problems of low effective energy and inability to transport, and achieve the effects of improving effective energy, solving the low pressure of by-product steam, and solving the effects of high temperature and strong corrosion

Active Publication Date: 2021-05-28
KUNMING UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above patents, because the heat energy recovery system of the phosphorus combustion tower and the heat energy recovery system of the hydration tower are independent of each other, the phosphorus combustion tower can generate medium and high pressure steam, and the heat generated by the hydration tower is limited by the temperature of polyphosphoric acid, so it can only produce 0.4-0.8MPa low-pressure steam cannot be transported to the external system for use, and the effective energy is low

Method used

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  • Thermal process phosphoric acid full heat energy recovery system
  • Thermal process phosphoric acid full heat energy recovery system
  • Thermal process phosphoric acid full heat energy recovery system

Examples

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Embodiment 1

[0023] Overall, such as figure 1 As shown, the embodiment of the present invention discloses a total heat energy recovery system for thermal phosphoric acid, including a phosphorus combustion tower 1, the lower part of the phosphorus combustion tower 1 is provided with an air inlet, and yellow phosphorus and air enter through the air inlet. Described phosphorus burning tower 1, soft water enters described phosphorus burning tower 1 from the upper head of described phosphorus burning tower 1 top, and one end of air guide pipe 1-1 is connected with described phosphorus burning tower 1, and the end of air guide pipe 1-1 The other end is connected with the top of the hydration tower 2, and the softened water heated on the air guide pipe 1-1 is sent to the deaerator 7 through the pipeline and mixed with part of the steam, and the water outlet of the deaerator 7 is connected to the deaerator 7 through the feed water pump 13. The soft water inlet of the economizer 8 is connected, the...

Embodiment 2

[0028] The system uses 2000kg / h yellow phosphorus to produce thermal phosphoric acid. The soft water first enters the upper head of the phosphorus combustion tower 1 and the air guide pipe 1-1 to be heated, then enters the deaerator 7, and is pumped into the economizer 8 through the feed water pump 13 After recovering the sensible heat of the gas brought into the hydration tower by the phosphorus combustion tower and the hydration heat of phosphorus pentoxide, it enters the steam drum of the phosphorus combustion tower as boiler feed water, and recovers the yellow phosphorus reaction heat and hydration heat of thermal phosphoric acid to generate 16.2t / h 1.5MPa medium pressure steam. Wherein the hydration tower 2 is a spray absorption tower.

[0029] During use, yellow phosphorus and natural air are burned in thermal phosphoric acid phosphorus burning tower 1, and the phosphorus pentoxide that combustion forms enters hydration tower 2, and mass percent concentration 105% (with ...

Embodiment 3

[0031] The system uses 2400kg / h yellow phosphorus to produce thermal phosphoric acid. The soft water first enters the upper head of the phosphorus combustion tower 1 and the air guide pipe 1-1 to be heated, then enters the deaerator 7, and is pumped into the economizer 8 through the feed water pump 13 After recovering the sensible heat of the gas brought into the hydration tower by the phosphorus combustion tower and the hydration heat of phosphorus pentoxide, it enters the steam drum of the phosphorus combustion tower as boiler feed water, and generates 21.6t / h by recovering the yellow phosphorus reaction heat and hydration heat of thermal phosphoric acid 2.5MPa medium pressure steam. The hydration tower 2 is a spray absorption tower with a process-intensified spiral guide pipe.

[0032] During use, yellow phosphorus and natural air are burned in the thermal phosphoric acid phosphorus burning tower 1, and the phosphorus pentoxide formed by combustion enters the hydration towe...

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Abstract

The invention discloses a thermal process phosphoric acid full heat energy recovery system, and relates to the technical field of phosphorus chemical industry. The system comprises a phosphorus burning tower, a hydration tower, an absorption tower, a venturi, a demister, an induced draft fan, a deaerator, an economizer, a dilute acid circulating tank, a phosphoric acid pump and a water feeding pump. In consideration of the whole process system, fresh soft water is deoxygenated after being heated through an upper head of the phosphorus burning tower and a gas guide pipe, and the deoxygenated water is pumped into the economizer by a high-pressure pump to recover heat of the hydration tower and then enters a phosphorus burning tower steam pocket to generate medium-high pressure steam; and unified recovery of heat of a thermal process phosphoric acid device is achieved, middle-high pressure steam is generated, effective energy is improved, a circulating cooling tower of the thermal process phosphoric acid device is omitted, and the thermal process phosphoric acid production system is efficient, energy-saving, environment-friendly and green.

Description

technical field [0001] The invention relates to the technical field of phosphorus chemical industry, in particular to a thermal phosphoric acid total heat energy recovery system with the effect of energy saving and emission reduction. Background technique [0002] Phosphoric acid is the basic raw material for the preparation of fine phosphate and other phosphorus chemical products, and it is used in petroleum, metallurgy, chemical industry, electronics, medicine and other industries. Thermal phosphoric acid has high purity and is widely used in food, electronic chemicals and medicine. The main patents of the existing two-step thermal phosphoric acid production process with heat recovery are: yellow phosphorus combustion heat energy recovery and utilization device and its thermal phosphoric acid production system (application number 01143443.0), which first disclosed the yellow phosphorus recovery reaction using natural air The thermal technical method recovers the radiant h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B1/00F22D1/00F22D1/50C01B25/20
CPCF22B1/00F22D1/00F22D1/50C01B25/20C01B25/12F27D2017/007F27D17/004
Inventor 梅毅杜加磊杨亚斌梁慧力王政伟何锦林蒋波翟持朱远蹠聂云祥
Owner KUNMING UNIV OF SCI & TECH
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