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Calcination process and device of building gypsum powder

A technology of building gypsum powder and calcination process, which is applied in the field of gypsum powder production, can solve the problems of unbalanced heat distribution, unstable calcination temperature, and large flue gas emission in a calciner, so as to improve heat utilization efficiency, reduce temperature and exhaust gas. The effect of low emissions

Active Publication Date: 2021-12-14
绵竹市邦宏奇海建筑材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing gypsum calcination process, a gas-fired hot blast stove or a coal-fired hot blast stove is usually used to provide high-temperature flue gas for the fluidized calciner. The temperature is lowered by indirect heat exchange, and the low-temperature flue gas after cooling is discharged through the pipeline or preheated for use. However, this calcination process has unbalanced heat distribution in the calcination furnace, unstable calcination temperature, large flue gas emissions, high energy consumption, and heat dissipation. Disadvantages of low utilization

Method used

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  • Calcination process and device of building gypsum powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] High temperature flue gas S 0 temperature T 0 =900℃; high temperature flue gas S 1 temperature T 1 =750℃; high temperature flue gas S 2 temperature T 2 =650℃; low temperature flue gas S 1 'Temperature T 1 '=170℃; low temperature flue gas S 2 'Temperature T 2 '=180°C; normal temperature air S 3 temperature T 3 =20℃; hot air S 3 'Temperature T 3 '=60℃; mixed gas S 4 temperature T 4 =100℃; mixed gas S 5 temperature T 5 =550°C; the calcining temperature in the first fluidized calciner 2 is 135°C, the calcined temperature in the second fluidized calciner 2 is 145°C, and the calcined temperature in the third fluidized calciner 2 is 150°C. The cooling temperature in the four fluidized calciners 2 was 110°C.

[0065] By adopting the calcination process of the present invention, under the above process conditions, not only qualified building gypsum powder can be produced, but also compared with the existing process, the calcination process of the present inventio...

Embodiment 2

[0067] High temperature flue gas S 0 temperature T 0 =950℃; high temperature flue gas S 1 temperature T 1 =780℃; high temperature flue gas S 2 temperature T 2 =690℃; low temperature flue gas S 1 'Temperature T 1 '=175℃; low temperature flue gas S 2 'Temperature T 2 '=185°C; normal temperature air S 3 temperature T 3 =25℃; hot air S 3 'Temperature T 3 '=65℃; mixed gas S 4 temperature T 4 =105℃; mixed gas S 5 temperature T 5 =580°C; the calcining temperature in the first fluidized calciner 2 is 130°C, the calcined temperature in the second fluidized calciner 2 is 140°C, and the calcined temperature in the third fluidized calciner 2 is 155°C. The cooling temperature in the four fluidized calciners 2 was 112°C.

[0068] By adopting the calcination process of the present invention, under the above process conditions, not only qualified building gypsum powder can be produced, but also compared with the existing process, the calcination process of the present inventio...

Embodiment 3

[0070] High temperature flue gas S 0 temperature T 0 =850℃; high temperature flue gas S 1 temperature T 1 =730℃; high temperature flue gas S 2 temperature T 2 =620℃; low temperature flue gas S 1 'Temperature T 1 '=165℃; low temperature flue gas S 2 'Temperature T 2 '=175°C; normal temperature air S 3 temperature T 3 =15°C; hot air S 3 'Temperature T 3 '=55℃; mixed gas S 4 temperature T 4 =92℃; mixed gas S 5 temperature T 5 =520 DEG C; the calcining temperature in the first fluidized calciner 2 is 135 DEG C, the calcined temperature in the second fluidized calciner 2 is 145 DEG C, and the calcined temperature in the third fluidized calciner 2 is 150 DEG C. The cooling temperature in the four fluidized calciners 2 was 108°C.

[0071] By adopting the calcination process of the present invention, under the above process conditions, not only qualified building gypsum powder can be produced, but also compared with the existing process, the calcination process of the ...

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Abstract

The present invention relates to the technical field of gypsum powder production, and provides a construction gypsum powder calcination process and device, using the low-temperature flue gas I discharged from the third fluidized calciner and the high-temperature flue gas S in the hot blast furnace 0 Mixing and deployment of high-temperature flue gas S that provides heat sources for the first three fluidized calciners 1 and high temperature flue gas S 2 , realize the recycling of flue gas waste heat; use the hot air S discharged from the fourth fluidized calciner 3 ′ It is mixed with the low-temperature flue gas II discharged from the third fluidized calciner to prepare the mixed gas S sent to the blast inlet of the hot blast stove 4 , the temperature of the combustion-supporting air of the hot-blast stove is improved, and then the oxygen content of the combustion-supporting air and the temperature of the combustion chamber in the hot-blast stove are reduced, and the heat utilization efficiency is improved; compared with the prior art, the present invention can increase the heat consumption by at least 10%. The utilization rate and production efficiency are increased by more than 15%.

Description

technical field [0001] The invention relates to the technical field of gypsum powder production, in particular to a construction gypsum powder calcining process and device. Background technique [0002] The main component of chemical gypsum such as phosphogypsum and natural gypsum is calcium sulfate dihydrate. To make it a practical building material, part of the crystallization water must be removed to make hemihydrate gypsum. This process is called calcination of gypsum. [0003] At present, the calcination process of gypsum is mainly as follows: firstly, phosphogypsum with a free water content of about 15% is mixed, dispersed, dried, and dehydrated to make gypsum powder with a free water content of ≤2%; Transport it to multiple fluidized calciners for further calcination, and then make qualified building gypsum powder. In the existing gypsum calcination process, a gas-fired hot blast stove or a coal-fired hot blast stove is usually used to provide high-temperature flue g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/036
CPCC04B11/036
Inventor 谭远林
Owner 绵竹市邦宏奇海建筑材料有限公司
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