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Process and device adopting cooperation between gypsum calcination and CO-coupled carbon thermal reduction

A gypsum and calcination technology, which is applied in the field of gypsum calcination and CO coupled carbon thermal reduction technology and equipment, can solve the problems of ecological environment and human health impact, sulfur resource waste, etc., to improve the decomposition rate of gypsum and quicklime production rate, reduce Decomposition temperature, effect of reducing dependence

Active Publication Date: 2020-08-07
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] SO in current flue gas 2 Emissions (acid rain, PM2.5) have a serious impact on the ecological environment and human health, and at the same time cause a serious waste of sulfur resources

Method used

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  • Process and device adopting cooperation between gypsum calcination and CO-coupled carbon thermal reduction

Examples

Experimental program
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Effect test

Embodiment 1

[0056] A process and device for gypsum calcination coordinated with CO coupled carbon thermal reduction, mainly including:

[0057] The gypsum is stored in the gypsum bin, and the feeding amount is precisely controlled by the feeder to be transported to the gypsum preheater for preheating and drying. The high-temperature heat source comes from the calcination flue gas discharged from the gypsum calcination section; the temperature of the gypsum after preheating and drying is 600- 1050°C, first enter the upper part of the gypsum calcining section, which is divided into upper and lower layers. During the last gypsum calcining process, it entered the lower part of the gypsum calcining section through the overflow pipe for secondary calcination to ensure sufficient solid residence time to obtain higher quicklime Yield, the temperature of the gypsum calcination section is 700-1200°C; the quicklime product produced by calcination is cooled to 20-50°C and stored in the quicklime stora...

Embodiment 2

[0059] A system for gypsum calcination coordinated with CO coupled carbon thermal reduction, including: calcination furnace, gypsum bin 1, gypsum preheater 2, carbon material bin 8, reheater 10, high-temperature filter 11, sulfur recovery device 12, quicklime storage Bin 14; the calciner is divided into SO from top to bottom 2 Reduction section 3, gypsum calcining section 4, external heat source 5, coke gasification section 6 and gas mixing section 7; the feed port of the gypsum calcining section 4 is connected to the gypsum preheater 2 and the gypsum bin 1 in sequence, and the gypsum The discharge port of the calcining section 4 is connected with the quicklime storage bin 14; the SO 2 The reduction section 3 is connected with the carbon material warehouse 8, and the SO 2 The reduction section 3 is also connected to the high-temperature separator 1, reheater 10, high-temperature filter 11, and sulfur recovery device 12 in sequence; the reheater 10 is also connected to the air...

Embodiment 3

[0061]A system for gypsum calcination coordinated with CO coupled carbon thermal reduction, including: calcination furnace, gypsum bin 1, gypsum preheater 2, carbon material bin 8, reheater 10, high-temperature filter 11, sulfur recovery device 12, quicklime storage Bin 14; the calciner is divided into SO from top to bottom 2 Reduction section 3, gypsum calcining section 4, external heat source 5, coke gasification section 6 and gas mixing section 7; the feed port of the gypsum calcining section 4 is connected to the gypsum preheater 2 and the gypsum bin 1 in sequence, and the gypsum The discharge port of the calcining section 4 is connected with the quicklime storage bin 14; the SO 2 The reduction section 3 is connected with the carbon material warehouse 8, and the SO 2 Reduction section 3 is also connected with high temperature separator 1, reheater 10, high temperature filter 11 and sulfur recovery device 12 in sequence; said reheater 10 is also connected with the air inle...

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Abstract

The invention relates to a process and a device adopting cooperation between gypsum calcination and CO-coupled carbon thermal reduction. According to the invention, circulating exhaust gas contains high-concentration CO2 which reacts with coke to generate CO, one part of the CO is used for reducing gypsum and SO2, and the other part of CO is used for supplementing heat in the reduction and calcining process of gypsum; flue gas obtained after calcination contains high-concentration SO2 and is subjected to a reaction in a temperature range of 600-1000 DEG C under the catalytic action of an activated carbon material so as to generate elemental sulfur steam; and the elemental sulfur steam is subjected to cooling and dedusting so as to recover sulfur, one part of the reduced exhaust gas in which sulfur is recovered is introduced into a flue gas purification system for purification, the purified exhaust gas is totally discharged, and the other part of the reduced exhaust gas is returned as circulating exhaust gas to the system to provide high-concentration CO2 for the system. The circulating exhaust gas in the system is preheated via a reducing gas cooling process, rich oxygen supplemented in the reduction and calcining process of gypsum is preheated through heat released during cooling of a calcination product, namely quick lime, and gypsum is dried and preheated through calcinationflue gas, so gradient utilization of energy is achieved through the system. In order to realize heat balance of the system, an external heat source is needed to supplement heat to the system.

Description

technical field [0001] The invention belongs to the field of resource utilization of solid waste, and in particular relates to a process and a device for gypsum calcining in cooperation with CO coupled carbon thermal reduction. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] At present, the production of industrial by-product gypsum in my country is about 118 million tons, and the comprehensive utilization rate is only 38%. Among them, desulfurization gypsum is about 43 million tons, with a comprehensive utilization rate of about 56%; phosphogypsum is about 50 million tons, with a comprehensive utilization rate of about 20%; other by-product gypsum is about 25 million ton...

Claims

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Application Information

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IPC IPC(8): C01B17/02C04B2/10
CPCC01B17/0264C04B2/10C04B2/106Y02P20/129
Inventor 马春元夏霄张立强崔琳赵希强李军
Owner SHANDONG UNIV
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