CN110451822B - Recycling process for circularly calcining limestone and carbon dioxide by product gas - Google Patents
Recycling process for circularly calcining limestone and carbon dioxide by product gas Download PDFInfo
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- CN110451822B CN110451822B CN201910753081.5A CN201910753081A CN110451822B CN 110451822 B CN110451822 B CN 110451822B CN 201910753081 A CN201910753081 A CN 201910753081A CN 110451822 B CN110451822 B CN 110451822B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
Abstract
The invention provides a recycling process for circularly calcining limestone and carbon dioxide by product gas, belonging to the technical field of industrial energy conservation and emission reduction.CO discharged by lime calcining shaft kiln in the process2After purification, firstly introducing the purified waste heat into a cooling section at the lower part of the shaft kiln, primarily heating the waste heat by utilizing the waste heat of a high-temperature lime product, and then heating the waste heat to 1200 ℃ by using a regenerative heating furnace; heated high temperature CO2Introducing the heat carrier into the middle calcining section of the shaft kiln to supply heat for the limestone calcining process; CO as a heat carrier after calcination2And CO produced by the new decomposition2Entering the preheating section at the upper part of the shaft kiln together to preheat unreacted limestone; then discharged from the top side of the preheating section for the next cycle. The process is ingenious, has strong operability, is suitable for various limestone calcining processes, and solves the problem of CO in the lime production process2Serious discharge, poor calcination quality and the like, and realizes the CO decomposition process of limestone2The total resources of (1) are recovered.
Description
Technical Field
The invention relates to the technical field of industrial energy conservation and emission reduction, in particular to a recycling process for circularly calcining limestone and carbon dioxide by using product gas.
Background
Lime is an important chemical raw material and is also widely applied to industrial processes such as iron making (sintering process), wet desulphurization, building material production and the like. At present, the annual lime production in China exceeds 2 hundred million tons, and accounts for about 70 percent of the total global lime production. Due to the lack of effective carbon dioxide emission reduction technology, the emission of carbon dioxide in the lime industry in China is about 2.4 hundred million tons, which becomes a carbon dioxide emission source in the second industrial process second to the cement industry, and causes serious environmental problems. The carbon emission in the lime production process mainly comprises carbon dioxide generated by decomposing limestone in the process, carbon dioxide generated by burning fuel, indirect carbon dioxide emission caused by electric equipment and the like. Among them, the carbon emission in the limestone decomposition process (the decomposition reaction equation is shown in formula 1) is the main factor, and is about 69% of the total carbon dioxide emission in lime production.
CaCO3(s)＝CaO(s)+CO2(g)(1)
In addition, the traditional lime kiln usually uses industrial fuels such as coal gas and the like as energy sources, and calcinations is carried out in a mode that fuel combustion flame is directly contacted with materials, and the flame combustion has certain uncontrollable property, so that the materials are easy to have the conditions of local over-burning, under-burning and the like; meanwhile, because a large amount of impurities exist in the flue gas generated by fuel combustion, the impurities react with the materials at high temperature, so that the product has high impurity content and low quality.
Therefore, in order to reduce the emission of carbon dioxide in the lime production process and improve the lime calcination quality, a new calcination process with high efficiency and low emission needs to be developed to realize carbon dioxide emission reduction and resource recovery.
Disclosure of Invention
The invention provides a recycling process for circularly calcining limestone and carbon dioxide by product gas, aiming at the problems of high carbon emission, poor limestone calcining quality and the like in the lime production process. The process utilizes CO generated in the decomposition process of limestone (calcium carbonate)2As a heat carrier, a high-efficiency calcining system based on product gas heat-carrying circulation is constructed to realize the CO decomposition process of limestone2The product gas is recycled in a full resource mode, so that the carbon emission in the lime production process is greatly reduced.
The specific process cycle of the process is as follows:
CO discharged from lime calcining shaft kiln2After purification, the purified lime is firstly introduced into a cooling section at the lower part of the lime calcining shaft kiln, the waste heat of high-temperature lime products is utilized for primary heating, and then CO is further treated by a regenerative heating furnace2Heating to over 1200 deg.C; heated high temperature CO2Introducing the heat carrier into the middle calcining section of the lime calcining shaft kiln, heating limestone ore materials through gas-solid countercurrent heat exchange, and supplying heat for the limestone calcining process; CO as a heat carrier after calcination2And CO produced by the new decomposition2Entering the upper preheating section of the lime calcining shaft kiln together to preheat unreacted limestone; then CO2And discharging from the top side of the preheating section for the next circulation.
The device related to the process comprises a lime calcining shaft kiln, a purifying device, a flow dividing device, a fan and a heat accumulating type heating furnace, wherein the lime calcining shaft kiln is divided into a preheating section, a calcining section and a cooling section from top to bottom, the calcining section and the cooling section are connected with the heat accumulating type heating furnace through pipelines, a limestone inlet is arranged above the preheating section, the side surface of the top of the preheating section is connected with the purifying device through a pipeline, the purifying device is connected with the flow dividing device behind the purifying device, and the fan is arranged on a pipeline of the flow dividing device.
The heat accumulating type heating furnace is arranged outside the lime calcining shaft kiln, so that direct contact between combustion flame and limestone mineral aggregate and lime products is avoided, the problems of local over-burning and under-burning of the mineral aggregate and the like are solved, and pollution of combustion smoke to the lime products is eliminated.
In the circulation process, the product gas CO2The concentration and the total amount are gradually increased after continuous enrichment. CO when satisfying the cyclic calcination process2After the demand, the flow dividing device will remove the surplus CO2And introducing the gas storage tank for resource recovery.
In the product gas heat-carrying circulating calcining system, limestone (calcium carbonate) is decomposed and reacted in high-concentration CO2Performed in an atmosphere to overcome high CO2The concentration has the inhibiting effect on the decomposition reaction, and the temperature of the heat carrier entering the lime kiln is over 1200 ℃ so as to meet the production requirement of lime.
The technical scheme of the invention has the following beneficial effects:
in the scheme, the process is ingenious in principle and easy to operate, and on one hand, CO generated in the calcining decomposition process is utilized2Constructing a circulating calcining system to enable CO2The enrichment is continuously carried out in the circulating process, the resource recovery is finally realized, and the carbon emission in the lime production process can be obviously reduced by more than 66 percent; on the other hand, the direct contact between the fuel combustion flame and the limestone ore aggregate is avoided through the mode that the fuel is combusted outside the furnace to generate heat, the problems of local over-combustion, under-combustion and the like of the ore aggregate are solved, and the adverse effect of impurity components in the combustion flue gas on a lime product is eliminated.
Drawings
FIG. 1 is a flow chart of the recycling process of limestone and carbon dioxide by circulating calcination of product gas.
Wherein: 1-lime calcining shaft kiln; 2-a purification device; 3-a flow splitting device; 4-a fan; 5-regenerative heating furnace.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention aims at CO in the lime production process2The problems of serious emission, poor limestone calcining quality and the like, and provides a recycling process for circularly calcining limestone and carbon dioxide by using product gas.
As shown in fig. 1, the device related to the process comprises a lime calcining shaft kiln 1, a purification device 2, a flow dividing device 3, a fan 4 and a heat accumulating type heating furnace 5, wherein the lime calcining shaft kiln 1 is divided into a preheating section, a calcining section and a cooling section from top to bottom, the calcining section and the cooling section are connected with the heat accumulating type heating furnace 5 through pipelines, a limestone inlet is arranged above the preheating section, the side surface of the top of the preheating section is connected with the purification device 2 through a pipeline, the rear part of the purification device 2 is connected with the flow dividing device 3, and the fan 4 is arranged on the pipeline of the flow dividing.
In operation, the lime calcines the CO emitted by the shaft kiln2After purification, the purified lime is firstly introduced into a cooling section at the lower part of the lime calcining shaft kiln, the waste heat of high-temperature lime products is utilized for primary heating, and then CO is further treated by a regenerative heating furnace2Heating to over 1200 deg.C; heated high temperature CO2Introducing the heat carrier into the middle calcining section of the lime calcining shaft kiln to supply heat for the limestone calcining process; CO as a heat carrier after calcination2And CO produced by the new decomposition2Entering the upper preheating section of the lime calcining shaft kiln together to preheat unreacted limestone; then CO2And discharging from the top side of the preheating section for the next circulation.
In practical application, limestone enters from the top of the lime calcining shaft kiln and moves slowly from top to bottom, and lime products generated by calcining are output from the bottom of the kiln. High temperature CO2Enters from the middle calcining section of the lime calcining shaft kiln, flows from bottom to top, and performs countercurrent heat exchange with limestone.
According to the process characteristics, the lime calcining shaft kiln is divided into a preheating section (upper part), a calcining section (middle part) and a cooling section (lower part). In the calcination stage, limestone is subjected to high temperature CO2Heating to reaction temperature to generate decomposition reaction; CO as a heat carrier after the reaction is completed2Temperature reduction, and CO produced by the new decomposition2Enters the preheating section together to preheat unreacted limestone and then is discharged from the top of the preheating section.
CO discharged from lime kiln2Enters the gas shunting device after being dedusted and purified by the purifying device. Most of CO is required according to the actual process2Carrying out circulating heat carrying under the action of a fan, and adding extra CO2Then resource recovery is performed.
CO as a heat carrier2Firstly, the waste heat of the high-temperature lime product is utilized to carry out CO treatment2Carrying out primary heating; subsequently the part of CO is2And introducing into a regenerative heating furnace for further heating to over 1200 ℃.
High temperature CO2The lime is supplied from the middle calcining section of the lime calcining shaft kiln to provide heat for calcining the limestone, and then is discharged from the side surface of the top of the kiln through the preheating section for the next circulation. CO in the circulation process2The concentration and the total amount are gradually increased by continuous enrichment. After stable operation, all CO generated by limestone decomposition can be realized2And recycling the resource.
The fuel is burnt in the heat accumulating type heating furnace outside the lime calcining shaft kiln, so that the direct contact between the burning flame of the fuel and the limestone mineral aggregate is avoided, the problems of local over burning, under burning and the like of the mineral aggregate are solved, the pollution of burning smoke to a lime product is eliminated, and the calcining effect and the product quality are favorably improved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (2)
1. A recycling process for circularly calcining limestone and carbon dioxide by product gas is characterized in that: the process cycle is as follows:
c discharged from lime calcining shaft kilnO2After purification, the purified lime is firstly introduced into a cooling section at the lower part of the lime calcining shaft kiln, the waste heat of high-temperature lime products is utilized for primary heating, and then CO is further treated by a regenerative heating furnace2Heating to over 1200 deg.C; heated high temperature CO2Introducing the heat carrier into the middle calcining section of the lime calcining shaft kiln to supply heat for the limestone calcining process; CO as a heat carrier after calcination2And CO produced by the new decomposition2Entering the upper preheating section of the lime calcining shaft kiln together to preheat unreacted limestone; then CO2Discharging from the top side of the preheating section for the next circulation;
the device related to the process comprises a lime calcining shaft kiln (1), a purifying device (2), a flow dividing device (3), a fan (4) and a heat accumulating type heating furnace (5), wherein the lime calcining shaft kiln (1) is divided into a preheating section, a calcining section and a cooling section from top to bottom, the calcining section and the cooling section are connected with the heat accumulating type heating furnace (5) through pipelines, a limestone inlet is formed above the preheating section, the side surface of the top of the preheating section is connected with the purifying device (2) through a pipeline, the flow dividing device (3) is connected behind the purifying device (2), and the fan (4) is arranged on the pipeline, connected with the cooling section, of the;
the flow dividing device (3) is used for dividing surplus CO2And introducing the gas storage tank for resource recovery.
2. The process for recycling and recovering the recycled calcined limestone and the carbon dioxide from the product gas as claimed in claim 1, is characterized in that: the heat accumulating type heating furnace (5) is arranged outside the lime calcining shaft kiln (1).
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| CN110451822B true CN110451822B (en) | 2020-12-08 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110836605A (en) * | 2019-11-21 | 2020-02-25 | 江苏新达石英有限公司 | Calcining device for quartz sand purification and using method thereof |
| CN111170660A (en) * | 2020-01-10 | 2020-05-19 | 北京科技大学 | Lime production system and method |
| CN111960696B (en) * | 2020-06-29 | 2022-04-05 | 中琉科技有限公司 | Lime kiln for directly burning high-temperature coal gas hot delivery of gasification furnace |
| CN111763019B (en) * | 2020-07-27 | 2023-06-20 | 北京科技大学 | Carbon capture lime calcination system and application method |
| CN112479606A (en) * | 2020-12-10 | 2021-03-12 | 石家庄新华能源环保科技股份有限公司 | Suspension kiln for producing lime |
| CN112916213B (en) * | 2021-02-09 | 2021-12-21 | 矿冶科技集团有限公司 | Carbon-neutralized mineral processing method |
| CN113072310B (en) * | 2021-03-30 | 2022-06-17 | 北京卡卢金热风炉技术有限公司 | Lime kiln and lime preparation method |
| CN115893875B (en) * | 2023-01-29 | 2024-01-12 | 新疆八一钢铁股份有限公司 | Shaft furnace lime kiln CO reduction 2 Method of venting |
| CN116496007A (en) * | 2023-05-16 | 2023-07-28 | 中冶长天国际工程有限责任公司 | Process method for decomposing lime by microwaves |
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| CN101182142A (en) * | 2007-12-03 | 2008-05-21 | 天津水泥工业设计研究院有限公司 | Method for calcining cement by carbide slag replacing whole limestone |
| CN101539037A (en) * | 2009-04-03 | 2009-09-23 | 东南大学 | Method for catching carbon dioxide by pressurized fluidized bed combustion combined recycle generating system |
| CN103979806A (en) * | 2014-05-13 | 2014-08-13 | 石家庄共创环保科技有限公司 | Carbon dioxide recovery chamber type lime shaft furnace |
| CN104016596A (en) * | 2014-05-27 | 2014-09-03 | 石家庄新华能源环保科技股份有限公司 | Rotary kiln with power generation device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130213280A9 (en) * | 2005-04-18 | 2013-08-22 | Klaus S. Lackner | Methods and systems for reducing carbon dioxide emissions |
| CN108314336A (en) * | 2018-05-09 | 2018-07-24 | 王长春 | A kind of lime kiln device using circulating air |
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| CN101182142A (en) * | 2007-12-03 | 2008-05-21 | 天津水泥工业设计研究院有限公司 | Method for calcining cement by carbide slag replacing whole limestone |
| CN101539037A (en) * | 2009-04-03 | 2009-09-23 | 东南大学 | Method for catching carbon dioxide by pressurized fluidized bed combustion combined recycle generating system |
| CN103979806A (en) * | 2014-05-13 | 2014-08-13 | 石家庄共创环保科技有限公司 | Carbon dioxide recovery chamber type lime shaft furnace |
| CN104016596A (en) * | 2014-05-27 | 2014-09-03 | 石家庄新华能源环保科技股份有限公司 | Rotary kiln with power generation device |
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