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Desulfurization gypsum dry method granulation technique in power plant

A desulfurized gypsum and process technology, applied in the direction of mold extrusion granulation, etc., can solve the problems of long production cycle and high production cost, and achieve the effect of short production cycle, easy operation, and uniform particles

Inactive Publication Date: 2008-05-28
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to overcome the prior art, the raw materials for granulation of desulfurized gypsum (water content 0% to 15%) in power plants need to be dried first, and granulation cementing agent is added, the production cycle is longer, and the production cost Due to the lack of advanced technology, a dry granulation process is proposed to directly granulate desulfurized gypsum in power plants

Method used

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  • Desulfurization gypsum dry method granulation technique in power plant
  • Desulfurization gypsum dry method granulation technique in power plant
  • Desulfurization gypsum dry method granulation technique in power plant

Examples

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Effect test

Embodiment 1

[0026] Example 1: dry granulation of desulfurized gypsum with a water content of 0% under strong pressure.

[0027]The desulfurized gypsum raw material is evenly sent to the screw mechanism of the degassing and densifying machine with a pitch of 50 mm by a belt conveyor. After the gypsum has a bulk density, it is directly sent to the smooth-surfaced pressure roller of the degassing densifier for second-stage degassing and densification. The speed of the pressure roller is 22 rpm, the diameter is 320 mm, and the width is 110 mm. The output is 2.5 tons / hour. Desulfurized gypsum after densification (its material properties are that the angle of repose is 22°, and the density is 1.1 g / cm 3 , the particle size distribution is: ≤200 mesh accounts for 4%~6%, 0.5~1.0 mm accounts for 9%~11%, 1.1~3.0 mm accounts for 64%~66%, 3.1~10.0 mm accounts for 14%~16%, ≥10.1 mm accounted for 4% to 6%) are evenly sent to the dry forced pressure granulator of B structure by the belt conveyor for g...

Embodiment 2

[0028] Example 2: dry granulation of desulfurized gypsum with a water content of 4% under strong pressure.

[0029] The desulfurized gypsum raw material is evenly sent to the screw mechanism of the degassing and densifying machine with a pitch of 80 mm by a belt conveyor, its rotating speed is 48 rpm, and the conveying output is 2.65 tons / hour. After removing air and initially increasing desulfurization After the gypsum has a bulk density, it is directly sent to the smooth-surfaced pressure roller of the degassing densifier for second-stage degassing and densification. The speed of the pressure roller is 28 rpm, the diameter is 280 mm, and the width is 118 mm. The output is 2.65 tons / hour. Desulfurized gypsum after densification (its material performance is that angle of repose is 24 °, density is 1.25 g / cm 3 , the particle size distribution is: ≤200 mesh accounts for 4%~6%, 0.5~1.0 mm accounts for 9%~11%, 1.1~3.0 mm accounts for 64%~66%, 3.1~10.0 mm accounts for 14%~16%, ≥10...

Embodiment 3

[0030] Example 3: dry granulation of desulfurized gypsum with a water content of 8% under strong pressure.

[0031] The desulfurized gypsum raw material is evenly sent to the screw mechanism of the degassing and densifying machine with a pitch of 145 mm by a belt conveyor. After the gypsum has a bulk density, it is directly sent to the smooth-surfaced pressure roller of the degassing densifier for second-stage degassing and densification. The speed of the pressure roller is 30 rpm, the diameter is 264 mm, and the width is 125 mm. The output is 2.75 tons / hour. Desulfurized gypsum after densification (its material performance is that the angle of repose is 26°, and the density is 1.37 grams / cm 3 , the particle size distribution is: ≤200 mesh accounts for 4%~6%, 0.5~1.0 mm accounts for 9%~11%, 1.1~3.0 mm accounts for 64%~66%, 3.1~10.0 mm accounts for 14%~16%, ≥10.1 mm accounted for 4% to 6%), it is evenly sent to the dry pressure granulator of structure A by the belt conveyor f...

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Abstract

The invention relates to a power plant desulfurized gypsum granulation process, particularly relating to a power plant desulfurized gypsum dry granulation process. The specific steps are: coal-fired power plant flue gas is desulfurized to obtain desulfurized gypsum with a water content between 0% and 15%, and the desulfurized gypsum is then sent to degassing densification machine to eliminate air and increase the processing of desulfurized gypsum bulk intensity. The processed desulfurized gypsum is then sent to a dry high pressure granulating machine for granulation. The invention has short production cycle, simple and quick process, convenient operation, great pressive strength of the granulation product, uniform and even particles, large output and low energy consumption, without secondary environment pollution.

Description

technical field [0001] The invention relates to a granulation process for desulfurized gypsum in a power plant, in particular to a dry granulation process for desulfurized gypsum in a power plant. Background technique [0002] In recent years, with the sustained and rapid development of the national economy, my country's power generation has increased year by year. In 2003, the national power generation reached 1,908 billion Kw h; in 2004, the national power generation exceeded 2,187 billion Kw h, an increase of 14.6%; in 2005, the national power generation surged to 2,472 billion Kw h, a year-on-year increase of 13.1%. According to forecasts, in the next 15 years, my country will still need to add more than 500 million Kw of installed power generation capacity. Since about 80% of my country's power generation is generated by coal combustion, the coal used for power generation accounts for about 1 / 3 of the country's total coal output every year. However, the sulfur content...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J2/22
Inventor 奚天鹏刘传义
Owner NANJING UNIV OF TECH
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