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Method for preparing hollow ball shaped fire-extinguishing powder of ammonium phosphate salt by utilizing spray-drying process

An ammonium phosphate, drying process technology, used in drying solid materials, heating to dry solid materials, drying and other directions, can solve the problems of poor floating performance, poor fluidity, high density, etc., and achieve good fire extinguishing effect and good fluidity. , good floating effect

Inactive Publication Date: 2006-09-27
BEIHANG UNIV
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Problems solved by technology

At present, the method of preparing ammonium phosphate dry powder fire extinguishing agent is mainly the crushing method, which is based on ammonium dihydrogen phosphate, and talc powder, mica powder, activated clay, silicone oil, white carbon black, sodium silicate, additives, and silicone oil are auxiliary materials. , prepared by crushing process after mixing, because the shape of the fire extinguishing powder produced by this crushing process is irregular, the fluidity is poor, and it is easy to agglomerate, which is not conducive to the spraying of ammonium phosphate dry powder from the nozzle of the fire extinguisher
In addition, the fire extinguishing powder prepared by the pulverization process is generally solid particles with high density and poor floating performance

Method used

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  • Method for preparing hollow ball shaped fire-extinguishing powder of ammonium phosphate salt by utilizing spray-drying process

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Embodiment Construction

[0020] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0021] The present invention is a method for preparing hollow spherical ammonium phosphate fire extinguishing powder by spray drying process, the preparation process comprises the following steps:

[0022] (A) The air produced by the blower heated by the heating furnace 6 is transported to the drying chamber 16 through the A channel 1, and the flow rate of the hot air in the A channel 1 is 300-2000m 3 / h, the temperature of the hot air flow at the output end of channel A 1 is 150°C to 500°C;

[0023] (B) Send the compressed air generated by the air compressor in channel C 3 to the atomizer 14, the compressed air pressure is 0.3-0.8MPa, and the airflow velocity is 20-120m 3 / h;

[0024] (C) Dissolve ammonium dihydrogen phosphate, thickener, surfactant and foaming agent in water at 10°C to 99°C, and stir evenly to obtain a precursor solution; put the ...

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Abstract

The invention relates to a method for preparing hollow ball ammonium phosphate salt fireproof powder with spray drying method. First, dissolving the mammonium dihydrogen phosphate and auxiliary agent into water to prepare the lead solution; then, atomizing said solution via nozzle to attain the atom drop in micron level; contacting the atom drop with hot airflow to be dried to attain the hollow ball powder; adding modifying agent on the powder to process surface modifying treatment; at last, using collector to collect the powder. The invention has simple process and stable operation, while the powder has high ball degree, less density, long floating time and better fireproof effect.

Description

technical field [0001] The present invention relates to a method for preparing ammonium phosphate fire extinguishing powder, more particularly, refers to a method for preparing ammonium phosphate fire extinguishing powder with an ultrafine hollow spherical structure of 0.1 to 20 microns by spray drying process and the prepared product thereof Ammonium phosphate fire extinguishing powder. Background technique [0002] As we all know, fire brings great harm to people's lives and property safety, so it is particularly important to improve fire extinguishing technology. An important item in fire extinguishing technology is the performance of fire extinguishing materials. At present, there are many fire extinguishing agents used in daily life and production process, with different properties. According to different fire extinguishing mechanisms, fire extinguishing agents can be roughly divided into two categories: physical fire extinguishing agents and chemical fire extinguishi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B3/12F26B17/10A62D1/06
Inventor 沈志刚傅宪辉蔡楚江麻树林邢玉山
Owner BEIHANG UNIV
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