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Production process and device for synthesizing calcium carbonate by carbonization and drying of high-temperature hot flue gas

A production process, calcium carbonate technology, applied in the direction of calcium carbonate/strontium/barium, energy input, etc., can solve the problems of clogging and wear of atomizing nozzles, bulky, complex slurry preparation system, etc., and achieves low operating costs and thermal expansion. , the effect of reducing environmental pollution

Active Publication Date: 2018-07-13
SINOMA INT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent requires a slurrying device, including a slurrying tank, a circulating pump group, and a spray gun. The slurry preparation system of this patent is complex and huge; factors such as uneven concentration and particle size of the lime slurry will cause blockage and wear of the atomizing nozzle

Method used

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  • Production process and device for synthesizing calcium carbonate by carbonization and drying of high-temperature hot flue gas
  • Production process and device for synthesizing calcium carbonate by carbonization and drying of high-temperature hot flue gas
  • Production process and device for synthesizing calcium carbonate by carbonization and drying of high-temperature hot flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Keep the outlet temperature at 250°C and the dust concentration at 60g / Nm 3 , the flow rate is 11000m 3 The high-temperature hot flue gas at the kiln tail of the cement plant enters the flue gas purification dust collector through the induced draft fan, and after the dust is removed by the flue gas purification dust collector, the dust concentration of the hot flue gas at the outlet is ≤5mg / Nm 3 , CO 2 The content is 20% (volume fraction), and the hot flue gas after purification enters the reaction tower. The mass ratio of quicklime to water is 1:5, and the quicklime is added to 80°C water for digestion to obtain a calcium hydroxide solution; the calcium hydroxide solution is aged after removing impurities, and the aging time is 10h; calcium hydroxide removes part of the water Finally, the calcium hydroxide wet material is obtained, and the solid content is 50%. Calcium hydroxide wet material 510kg / h is added into the reaction tower by a screw feeder, the reaction te...

Embodiment 2

[0051] Set the outlet temperature at 450°C and the dust concentration at 100g / Nm 3 , the flow rate is 30000m 3 / h The hot flue gas of the high temperature fan at the kiln tail enters the flue gas purification dust collector through the induced draft fan. After the hot flue gas of the high temperature fan at the kiln tail is dusted by the flue gas purification dust collector, the dust concentration of the hot flue gas at the outlet is ≤10mg / Nm 3 , CO 2 Content 20% (volume fraction). The purified hot flue gas enters the reaction tower. The mass ratio of quicklime to water is 1:10, and the quicklime is added to water at 60°C for digestion to obtain a calcium hydroxide solution; the calcium hydroxide solution is aged after removing impurities, and the aging time is 5h; calcium hydroxide removes part of the water Finally, the calcium hydroxide wet material is obtained, and the solid content is 30%. Calcium hydroxide wet material 1500kg / h is fed into the reaction tower by a sc...

Embodiment 3

[0054] Keep the outlet temperature at 300°C and the dust concentration at 100g / Nm 3 , the flow rate is 20000m 3 / h The hot flue gas of the high temperature fan at the kiln tail enters the flue gas purification dust collector through the induced draft fan. After the hot flue gas of the high temperature fan at the kiln tail is dusted by the flue gas purification dust collector, the dust concentration of the hot flue gas at the outlet is ≤10mg / Nm 3 , CO 2 Content 20% (volume fraction). The purified hot flue gas enters the reaction tower. Industrial calcium carbide slag wet material 1100kg / h is fed into the reaction tower by a screw feeder, the reaction temperature is 200°C, the calcium carbide slag wet material with a solid content of 60% and CO 2 The gas undergoes carbonization and drying reactions, and dry calcium carbonate powder products can be obtained in the reaction tower. The dried calcium carbonate powder product enters the product collection dust collector with th...

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Abstract

The invention discloses a production process and device for synthesizing calcium carbonate by carbonization and drying of high-temperature hot flue gas. The process includes: after the high-temperature hot flue gas from the kiln tail of a cement plant is dedusted by a flue gas purification and dust collector, the clean hot flue gas enters a reaction tower . The calcium hydroxide wet material is fed into the reaction tower from the feeder. The calcium hydroxide wet material and the hot flue gas in the reaction tower conduct mass transfer and heat transfer, complete the carbonization reaction and drying process, and finally obtain the calcium carbonate powder product. The dried calcium carbonate powder product enters the product collection dust collector along with the hot flue gas, and the gas-solid separation is realized in the product collection dust collector. The gas is discharged by the induced draft fan, and the sinking calcium carbonate powder product is collected by the product dust collector. The discharge valve at the lower end discharges. The invention utilizes the waste high-temperature hot flue gas at the kiln tail of the cement plant, which not only reduces the emission of greenhouse gases (CO2), but also makes full use of waste heat, and synthesizes high value-added chemical products through reaction and drying integration. The process flow is simple and there is no ash water. secondary pollution.

Description

technical field [0001] The invention relates to a production process and device for synthesizing calcium carbonate, in particular to a production process and device for synthesizing calcium carbonate integrated by carbonization and drying of high-temperature hot flue gas at the kiln tail of a cement plant, and belongs to the technical field of industrial waste gas and waste heat reuse . Background technique [0002] CO 2 The large amount of emission not only causes a serious waste of resources, but also, as the main greenhouse effect gas, leads to the increase of the earth's surface temperature, the increase of diseases and insect pests, the drought and desertification of the land and the abnormal climate, and the environmental pollution caused by it is obvious. [0003] At present, in the domestic cement industry, the loss and waste of carbon dioxide is still quite serious. Hundreds of millions of tons of carbon dioxide are emitted every year, and a large amount of this c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
CPCY02P20/129
Inventor 蔡玉良冯冬梅肖国先汤升亮卢仁红刘渊徐磊成力
Owner SINOMA INT ENG
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