Method and device for firing lime and producing CO2 as byproduct by using totally-enclosed multiple kilns in series with oxygen

A fully enclosed CO2 technology, applied in chemical instruments and methods, inorganic chemistry, energy input, etc., can solve the problems of lack of effective methods for recycling, difficulty in separating and purifying carbon dioxide, and high production cost of carbon dioxide, so as to achieve easy purification and recycling, Elimination of diffusion resistance and reduction of purification costs

Pending Publication Date: 2021-04-09
崇左南方水泥有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combustion-supporting gas used for conventional lime burning is air, which contains 78% nitrogen and 21% oxygen, so the flue gas obtained from burning lime contains a large amount of nitrogen, and it is difficult to separate and purify carbon dioxide. The production cost of carbon dioxide is high, so the flue gas of conventional lime burning is directly treated as waste gas, and there is no effective method for recycling

Method used

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  • Method and device for firing lime and producing CO2 as byproduct by using totally-enclosed multiple kilns in series with oxygen
  • Method and device for firing lime and producing CO2 as byproduct by using totally-enclosed multiple kilns in series with oxygen
  • Method and device for firing lime and producing CO2 as byproduct by using totally-enclosed multiple kilns in series with oxygen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as Figure 1~3 As shown, the fully enclosed multi-kilns are connected in series to burn lime with oxygen and by-produce CO 2 The device comprises two lime kilns 1, flue gas waste heat boiler 11, negative pressure air extractor 12, first flue gas pipeline 9, second flue gas pipeline 10, auxiliary gas pipeline 7, fuel gas pipeline 8; each Lime kiln 1 is provided with a tangential spiral gas distribution cap 5, the tangential spiral gas distribution cap 5 is a tower type tangential spiral gas distribution cap, which is divided into 3 layers, each layer has a vertical angle α of 2° and a horizontal angle of β is 5°; the top of the lime kiln 1 is provided with a material inlet 2 and a flue gas outlet 4 respectively, and the bottom of the lime kiln 1 is provided with a material outlet 3; one end of the first flue gas pipe 9 is connected to the flue gas The hot phase inlet of the gas waste heat boiler 11 is connected; the hot phase outlet of the flue gas waste heat boile...

Embodiment 2

[0046] Fully enclosed multi-kiln connected in series to burn lime with oxygen and produce CO by-product 2 device, which includes three lime kilns 1, flue gas waste heat boiler 11, negative pressure air extractor 12, first flue gas pipeline 9, second flue gas pipeline 10, auxiliary gas pipeline 7, fuel gas pipeline 8; each Lime kiln 1 is provided with a tangential spiral gas distribution hood 5, the tangential spiral gas distribution hood 5 is a tower type tangential spiral gas distribution hood, which is divided into 5 layers, the vertical angle α of each layer is 30°, and the horizontal angle β is 45°; the top of the lime kiln 1 is provided with a material inlet 2 and a flue gas outlet 4 respectively, and the bottom of the lime kiln 1 is provided with a material outlet 3; one end of the first flue gas pipe 9 is connected to the flue gas The hot phase inlet of the gas waste heat boiler 11 is connected; the hot phase outlet of the flue gas waste heat boiler 11 is connected with...

Embodiment 3

[0051] Fully enclosed multi-kiln connected in series to burn lime with oxygen and produce CO by-product 2 The device is different from the device described in Embodiment 2 in that: the tangent spiral gas distribution cap 5 is a tower-type tangent spiral gas distribution cap, which is divided into 4 layers, and the vertical angle α of each layer is 4°, and the lateral angle β is 8°; the lime kiln 1 is a rotary kiln; the material inlet 2 and the material outlet 3 of the lime kiln 1 are connected with a gas replacement device 6; the flue gas waste heat boiler 11 is a tubular heat exchanger; The negative pressure air extractor 12 is a negative pressure twin-screw type air extraction compressor.

[0052] Fully enclosed multi-kiln connected in series to burn lime with oxygen and produce CO by-product 2 method, using the fully enclosed multi-kiln series oxygen burning lime described in this example and by-product CO 2 device, specifically as Image 6 As shown, three lime kilns 1 a...

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Abstract

The invention discloses a method and a device for firing lime and producing CO2 as byproduct by using totally-enclosed multiple kilns in series with oxygen. The unit includes more than two lime kilns, a flue gas waste heat boiler, a negative pressure air extractor, a first flue gas pipeline, a second flue gas pipeline, a combustion-supporting gas pipeline and a fuel gas pipeline; wherein a tangential spiral gas distribution hood is arranged in each lime kiln; one end of the first flue gas pipeline is connected with a hot phase inlet of the flue gas waste heat boiler; a hot phase outlet of the flue gas waste heat boiler is connected with an inlet of the negative pressure air extractor, and a flue gas outlet of the lime kiln is connected with a first flue gas pipeline and a second flue gas pipeline; and an inlet of the tangential spiral gas distribution hood in each lime kiln is connected with the second flue gas pipeline, the combustion-supporting gas pipeline and the fuel gas pipeline through pipelines respectively. All stages of lime kilns are sequentially arranged and subjected to kiln unloading, kiln loading, preheating, thermal decomposition reaction and other procedures alternately and continuously to produce calcium oxide. The method has the advantages of being short in temperature rising time, free of dust and CO2 emission and high in energy utilization rate.

Description

technical field [0001] The invention belongs to the technical field of quicklime production equipment, and in particular relates to fully enclosed multi-kilns connected in series to burn lime with oxygen and produce CO as a by-product. 2 method and device. Background technique [0002] Quicklime (CaO) is made from limestone (CaCO 3 ) is prepared by thermal decomposition reaction, the general thermal decomposition temperature is 900 ° C ~ 1200 ° C, the thermal decomposition reaction formula is [0003] [0004] The thermal decomposition reaction formula (1) is a strong endothermic reaction, which needs to be burned with coal gas or natural gas or coal or coke to provide heat. The combustion reaction formula with coke as fuel and air as combustion-supporting gas is [0005] C+O 2 (air containing O 2 21%, N 2 79%) → CO 2 +N 2 ΔH r2 =-393.5 kJ / mol (2) [0006] It can be seen from equations (1) and (2) that CaCO 3 Thermal decomposition and coke combustion release a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10C01B32/50
CPCC04B2/10C01B32/50Y02P20/129
Inventor 陈小鹏童张法季军荣王琳琳周丹梁杰珍韦小杰廖丹葵孙建华周洲杨金彪王权广覃玲意
Owner 崇左南方水泥有限公司
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