Hot-process phosphoric acid production device with low-temperature heat energy recovery

A technology of heat energy recovery and thermal phosphoric acid, which is applied in the field of chemical engineering, can solve problems such as heat pollution, heat waste, and water consumption, and achieve the effects of reducing environmental pollution, reducing product losses, and achieving good economic benefits

Active Publication Date: 2016-07-06
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Under this process condition, on the one hand, the circulating water removes the heat, resulting in a huge waste of heat; on the other hand, the circulating wa

Method used

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  • Hot-process phosphoric acid production device with low-temperature heat energy recovery
  • Hot-process phosphoric acid production device with low-temperature heat energy recovery

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: as figure 1 , 2 As shown, the thermal phosphoric acid production device with low-temperature heat energy recovery includes a combustion tower 1, a primary absorption tower 2, a shell and tube boiler 3, a secondary absorption tower 5, a venturi 7, a wire mesh eliminator 9, and an induced draft fan 10 The combustion tower 1 communicates with the secondary absorption tower 5 through the first-level absorption tower 2, and the secondary absorption tower 5 communicates with the wire mesh demister 9 through the Venturi 7, and the wire mesh demister 9 is connected with the induced draft fan 10, and the shell Type boiler 3 is connected with primary absorption tower 2 through primary phosphoric acid pump 4 and forms a closed loop; shell-and-tube boiler 3 includes polyphosphoric acid inlet 11, furnace body 12, heat exchange tube 14, liquid-gas separator 15, main Steam valve 16, auxiliary steam valve 17, water level gauge 20, polyphosphoric acid outlet 21, water inl...

Embodiment 2

[0022] Embodiment 2: The structure of this thermal phosphoric acid production device with low-temperature heat energy recovery is the same as that of Embodiment 1, except that the primary absorption tower 2 is an empty tower with nozzles, and the nozzles in the tower have 4 layers; the heat exchange tubes 14 are thin-walled tubes with uniform Arranged, the pipe diameter is 20mm, the wall thickness is 2.5mm, the uppermost layer of the heat exchange tube is required to be 120mm below the horizontal centerline of the furnace body, and the water level in the boiler is 30mm below the horizontal centerline of the furnace body.

[0023]During use, yellow phosphorus and natural air are burned in thermal phosphoric acid combustion tower 1, and the phosphorus pentoxide gas that combustion forms enters primary absorption tower 2, and mass percent concentration 115% (as H 3 PO 4 The polyphosphoric acid is atomized through the nozzle, and the polyphosphoric acid is sprayed from top to bott...

Embodiment 3

[0024] Embodiment 3: The structure of this thermal phosphoric acid production device with low-temperature heat energy recovery is the same as that of Embodiment 1, except that the first-stage absorption tower 2 is a dynamic wave absorption tower with nozzles, and the nozzles in the tower are arranged in two layers, one for each layer; The heat pipes 14 are uniformly arranged thin-walled tubes with a diameter of 50mm and a wall thickness of 4.5mm. The uppermost layer of heat exchange tubes is required to be 150mm below the horizontal centerline of the furnace body, and the water level in the boiler is 10mm below the horizontal centerline of the furnace body.

[0025] During use, yellow phosphorus and natural air are burned in the thermal phosphoric acid combustion tower 1, and the phosphorus pentoxide formed by combustion enters the primary absorption tower 2, and the mass percentage concentration is 118% (in the form of H 3 PO 4 The polyphosphoric acid is atomized through the ...

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Abstract

The invention discloses a hot-process phosphoric acid production device with low-temperature heat energy recovery. The device comprises a combustion tower, a first-level absorption tower, a tube-shell boiler, a second-level absorption tower, a Venturi, a mesh mist eliminator and an induced draft fan, wherein the temperature of polyphosphoric acid in the first-level absorption tower is 150-200 DEG C. According to the hot-process phosphoric acid production device, the heat energy of polyphosphoric acid is converted into low-pressure steam for recovery by the tube-shell boiler; and the manufacturing cost of the low-temperature heat energy recovery device is low, 10-30% of the heat energy of the combustion heat of yellow phosphorus can be recycled, the water resource consumption and environmental pollution are reduced, and the device conforms to the production technology requirements of high efficiency, energy conservation, environmental protection and cleanness.

Description

technical field [0001] The invention relates to a thermal phosphoric acid production device with low-temperature heat energy recovery, which belongs to the field of chemical engineering. Background technique [0002] Phosphoric acid is the basic raw material for the preparation of fine phosphate and other phosphorus chemical products, and is widely used in petroleum, metallurgy, chemical industry, electronics, medicine and other industries. Phosphoric acid can form an insoluble phosphate film on the metal surface to protect the metal from corrosion; phosphoric acid and nitric acid are mixed as a chemical polishing agent to improve the smoothness of the metal surface; phosphoric acid is also often used in the production of detergents, pesticides and containing Raw material of phosphorus flame retardant; Phosphoric acid is one of food additives, used as sour agent and yeast nutrient in food. [0003] In the existing two-step thermal phosphoric acid production process with hea...

Claims

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Application Information

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IPC IPC(8): C01B25/18C01B25/24
CPCC01B25/18C01B25/24Y02P20/10Y02P20/129
Inventor 梅毅任新林龙萍
Owner KUNMING UNIV OF SCI & TECH
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