Method for preparing calcium oxide and sulfur by double-atmosphere fluidized roasting of desulfurated gypsum

A desulfurization gypsum, boiling roasting technology, applied in the preparation/purification of sulfur, calcium/strontium/barium oxide/hydroxide, chemical industry, etc., can solve the problem of low comprehensive utilization rate of desulfurization gypsum, and achieve rich coal raw materials , easy to operate, low energy consumption

Inactive Publication Date: 2012-01-04
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the comprehensive utilization rate of the existing desulfurized gypsum is not high, and to provide a method for preparing calcium oxide and sulfur by using desulfurized gypsum double-atmosphere boiling roasting

Method used

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  • Method for preparing calcium oxide and sulfur by double-atmosphere fluidized roasting of desulfurated gypsum
  • Method for preparing calcium oxide and sulfur by double-atmosphere fluidized roasting of desulfurated gypsum

Examples

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Embodiment 1

[0036] Example 1. Taking a production line with a processing capacity of 100,000 tons / year of desulfurized gypsum (dry basis) as an example, the following figure 1 process flow. 12.5t / h of desulfurized gypsum (dry basis) into the circulating fluidized bed decomposition furnace, the temperature is 600°C, and the air volume into the furnace is 9500m 3 / h, temperature 250°C, primary air volume 7600m 3 / h, secondary air volume 1900m 3 / h (secondary air accounts for 20% of the total air volume). The temperature of the gas exiting the calciner is 1200°C, the decomposition rate of gypsum is 99.3%, and the composition of the furnace gas is SO 2 Volume fraction 12.4%, O 2 Volume fraction 1.0%, CO 2 Volume fraction 10.3%, N 2 The volume fraction is 76.3%. The amount of slag discharged from the calciner is 5.7t / h, of which the mass fraction of CaO is 90.5%, which meets the quality index of calcium oxide for flue gas desulfurization. The reduction combustion furnace uses water ga...

Embodiment 2

[0037] Example 2. Also take a production line with a desulfurization gypsum (dry basis) processing capacity of 100,000 tons per year as an example. figure 1 process flow. 12.5t / h of desulfurized gypsum (dry basis) into the circulating fluidized bed decomposition furnace, the temperature is 700°C, and the air volume into the furnace is 8500m 3 / h, temperature 300°C, primary air volume 7000m 3 / h, secondary air volume 1500m 3 / h (secondary air accounts for 17.6% of the total air volume). The temperature of the gas exiting the calciner is 1000°C, the decomposition rate of gypsum is 99.1%, and the composition of the furnace gas is SO 2 Volume fraction 14.0%, O 2 Volume fraction 1.0%, CO 2 Volume fraction 10.1%, N 2 The volume fraction is 74.9%. The amount of slag discharged from the calciner is 5.65t / h, of which the mass fraction of CaO is 89.5%, which meets the quality index of calcium oxide for flue gas desulfurization. The reduction combustion furnace uses water gas as...

Embodiment 3

[0038] Example 3. Also take a production line with a desulfurization gypsum (dry basis) processing capacity of 100,000 tons per year as an example. figure 1 process flow. 12.5t / h of desulfurized gypsum (dry basis) into the circulating fluidized bed decomposition furnace, the temperature is 700°C, and the air volume into the furnace is 8000m 3 / h, temperature 300°C, primary air volume 6500m 3 / h, secondary air volume 1500m 3 / h (secondary air accounts for 18.75% of the total air volume). The temperature of the gas exiting the calciner is 950°C, the decomposition rate of gypsum is 99%, and the composition of the furnace gas is SO 2 Volume fraction 15.0%, O 2 Volume fraction 1.0%, CO 2 Volume fraction 9.0%, N 2 The volume fraction is 76.0%. The slag discharge of the calciner is 5.6t / h, of which the mass fraction of CaO is 90.0%, which meets the quality index of calcium oxide for flue gas desulfurization. The reduction combustion furnace uses water gas as fuel, the combus...

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Abstract

The invention provides a method for preparing calcium oxide and sulfur by double-atmosphere fluidized roasting of desulfurated gypsum, belonging to the technical fields of solid pollutant treatment and in environmental protection chemical production. The method comprises the following steps: drying and dehydrating aged desulfurated gypsum, and then entering a multi-stage suspension heat exchangerfor pre-heating; entering hot-state gypsum into a circulating fluidized bed decomposition furnace, and introducing primary and secondary air for decomposition; cooling discharged hot-state calcium oxide, wherein cooled hot-state calcium oxide is used as a desulfurizer for later use; entering discharged smoke containing sulfur dioxide into the multi-stage suspension heat exchanger; removing calcium oxide dust in cooled hot smoke through multi-stage dust removing equipment; and feeding the smoke without the dust into a high-temperature-resistant high-efficiency filter for further removing the dust, and feeding clean smoke into a sulfur recovery system; and preparing the sulfur product by the processes of hot reduction, catalytic reduction, Clause reaction and the like, and feeding Clause tail gas into a coal burning boiler in a power plant for combustion. The method has the advantages of good environmental protection benefits and strong economic benefits.

Description

technical field [0001] The invention belongs to the technical field of solid pollutant control and chemical production in environmental protection, and specifically relates to a method for preparing calcium oxide and sulfur dioxide by thermally decomposing desulfurized gypsum in a double atmosphere, and then reducing the sulfur dioxide to produce sulfur. Background technique [0002] Lime / limestone-gypsum flue gas desulfurization technology is widely used in my country. At present, about 75% of the total capacity of thermal power plant generating units in the country and most coal-fired boilers and sintering machines in steel plants use lime / limestone-gypsum to remove flue gas. of sulfur dioxide. The main component of the desulfurization gypsum by-product in the desulfurization process is calcium sulfate dihydrate, and it also contains impurities such as calcium sulfite, calcium oxide, calcium hydroxide, calcium carbonate and coal ash. According to the "Guiding Opinions of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/04C01B17/04
CPCY02P20/10Y02P20/129
Inventor 纪罗军黄新明素荣邵丹雄金苏闽
Owner CHINA PETROCHEMICAL CORP
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