A kind of method utilizing sulfuric acid tail gas to dry ammonium phosphate

A technology of sulfuric acid tail gas and ammonium phosphate, applied in the direction of drying gas arrangement, drying, dryer, etc., can solve the problem of not being utilized

Inactive Publication Date: 2011-11-30
刘宏
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  • Claims
  • Application Information

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Problems solved by technology

The tail gas temperature of the sulfuric acid plant is about 80°C, the moisture content is less than 0.1g / m3, and the relative humidity is 0.03%. It can be regarded as a dry gas without moisture and is an ideal drying medium. Currently, it is directly discharged into the atmosphere. , not utilized

Method used

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  • A kind of method utilizing sulfuric acid tail gas to dry ammonium phosphate

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Embodiment Construction

[0009] exist figure 1 In the process, the gas at the outlet of the sulfuric acid secondary absorption tower 1 is heated to 140-160°C by the gas-steam heat exchanger 3 under the action of the blower 2, and then sent to the bottom of the spray drying tower 4. 4. The ammonium phosphate slurry sprayed from the upper part is mixed and contacted, and the heat and moisture are transferred between the gas and liquid phases. The moisture content of the dried product is ≤ 3%, and it is discharged from the lower part of the spray drying tower 4, and the gas at the outlet of the spray drying tower 4 enters the washing process. The tower is emptied after dust removal and desulfurization. In order to prevent the tail gas sucked by the blower 2 from affecting the operation of the sulfuric acid plant, the blower 2 uses a frequency converter to control the motor speed, and installs a pressure gauge on the outlet pipe of the second suction tower to detect the pressure on the outlet pipe of the ...

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Abstract

A method for drying ammonium phosphate by using sulfuric acid tail gas. The tail gas temperature of the sulfuric acid plant is about 80°C, and the moisture content is less than 0.1g/m3. It can be regarded as a dry gas without moisture. After the sulfuric acid tail gas is heated to 140-160°C by steam, it is sent to the spray drying tower as dry phosphorus ammonium medium. The implementation of this method will not affect the existing production systems of sulfuric acid and ammonium phosphate, and its advantage is that it can not only recycle the sensible heat of sulfuric acid tail gas, but also increase the drying rate of ammonium phosphate.

Description

technical field [0001] The patent of the present invention relates to the process technology of using sulfuric acid tail gas to dry ammonium phosphate in a factory with sulfuric acid and ammonium phosphate production equipment. The application of this technology can save energy and reduce consumption, and improve the drying rate of ammonium phosphate. Background technique [0002] In the production equipment that uses the spray drying process to dry ammonium phosphate, indirect heating air is generally used as the drying medium, the heat source is steam or hot flue gas, and the relative humidity of the air is 40% to 80%. For the drying process, we It is hoped that the relative humidity of the drying medium should be as low as possible. The tail gas temperature of the sulfuric acid plant is about 80°C, the moisture content is less than 0.1g / m3, and the relative humidity is 0.03%. It can be regarded as a dry gas without moisture and is an ideal drying medium. Currently, it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B21/14F26B17/10
Inventor 刘宏
Owner 刘宏
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