CN105314894A - Rotary kiln device and method for indirectly producing lime and recycling carbon dioxide - Google Patents
Rotary kiln device and method for indirectly producing lime and recycling carbon dioxide Download PDFInfo
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- CN105314894A CN105314894A CN201510064805.7A CN201510064805A CN105314894A CN 105314894 A CN105314894 A CN 105314894A CN 201510064805 A CN201510064805 A CN 201510064805A CN 105314894 A CN105314894 A CN 105314894A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The invention provides a rotary kiln device and method for indirectly producing lime and recycling carbon dioxide. The rotary kiln device and method are used for combusting limestone with the small granularity of 20 mm-40 mm produced in a mine through fuel in an inner barrel combustion chamber in a rotary kiln, heat is radiated and transmitted to the limestone in the rotary kiln for indirect calcination, and the combustion chamber and a calcination chamber are completely isolated. The calcined limestone is decomposed into calcium oxide and carbon dioxide gas, calcium oxide is cooled and then discharged through an ash discharge device and enters an ash bin, carbon dioxide is used for preheating the limestone through a preheater, collected through a gas collecting tube and then subjected to dust removal, drying, pressurizing, treatment of a liquefying device and treatment of a dry ice device, and then dry ice is produced; after gas or pulverized coal is combusted in the combustion chamber, generated waste gas is used for preheating the limestone through the preheater, purified and then subjected to waste heat recovery; a cooler cools waste heat generated by calcium oxide, and the waste heat serves as secondary combustion-supporting air. High-quality and few-impurity active lime can be produced, resources are saved, and carbon emissions and the greenhouse effect can be reduced.
Description
Technical field
The present invention relates to metallurgy, chemical technology field, especially metallurgy industry utilizes calcined by rotary kiln Wingdale production high-performance quickened lime, utilizes and produces the apparatus and method that carbon dioxide produces dry ice.
Background technology
Copenhagen climate change investigation in 2009, makes low-carbon economy become global focus.The Economic Development Mode of low-carbon economy based on less energy-consumption, low stain, low emission, it is the fundamental change of the mode of production to a large amount of fossil energy of existing consumption, a large amount of discharge carbonic acid gas, the Chinese government promises to undertake the year two thousand twenty, the CO2 emissions of per GDP than decline 40-45% in 2005, and is included into national economy and social development medium-term and long-term plans as the binding indicator.
Carbonic acid gas is as a kind of important resource, of many uses, and simultaneously the discharge of carbonic acid gas is also the one of the main reasons causing Global warming, and reclaiming carbonic acid gas so effective both can saving resource, also can reduce topsoil and Greenhouse effect.
For metallurgy industry, lime is the slag making materials of alkalescence steel-making.Main component is CaO.Quickened lime is compared with common lime, and slagging speed is fast, shorten the heat, and improves furnace life, reduces splash, have good desulfurization, dephosphorization effect, can significantly improve Steel Capacity and steel quality, and reduce smelting cost.For making lime rapid melting, rapid slagging, lime should have higher response capacity, containing lower impurity.The domestic and international main kiln type for calcination particulate lime is rotary kiln at present, this type of kiln is used for calcination 20-40mm small grain size Wingdale, the many bird's eye gravel lime stones abandoned of current China limestone mine can be made full use of, coal gas calcination together with Wingdale is adopted to produce quickened lime, for the comprehensive utilization of resources of China's limestone mine opens new way.For rotary system investment high, equipment is complicated, troublesome maintenance, more importantly construction cost is high, finished product ton ash cost is higher, ben is because lime burns together with fuel mix, decompose the carbonic acid gas produced and contain residual coal gas, be difficult to the carbonic acid gas reclaiming discharge, the high-temperature flue gas that burning produces is due to containing a large amount of dust, and recovery difficult is larger, pollute environment and energy dissipation, do not want to adapt to the recycling economy of national requirements, low-carbon emission.Lime burns together with fuel mix in addition, and particularly calcination process increases Coal powder spray again, and lime quality is obviously reduced, and impurity improves, and sulphur content increases, and increases next procedure steel desulfurization cost and slag making difficulty.
The gas that the manufacture of current domestic dry ice is mainly produced by petrochemical industry passes through to purify and obtain carbonic acid gas after catalyzed oxidation, then through removing objectionable impurities, cooling, pressurization are produced into liquid carbon dioxide, manufacture dry ice by dry ice device.The method is from raw materials cost or production run cost is all higher.
Summary of the invention
Produce the problems referred to above of lime existence for existing rotary kiln, the main purpose of technical scheme provided by the invention is:
A kind of indirect production lime is provided, reclaims the rotary kiln apparatus and method of carbonic acid gas.
To achieve these goals, present invention employs following technical scheme:
Rotary kiln apparatus and method for indirect production lime, recovery carbonic acid gas, wherein, comprising:
Inner/outer tube rotary kiln
Inner core combustion chamber is set in rotary kiln, produces thermal source in order to burning;
Rotary kiln urceolus, is treated calcined limestone in order to place, and is separated by inner/outer tube heat transfer wall and combustion chamber;
Effuser, connects preheating material road, in order to gather the gas that rotary kiln urceolus lime calcining produces;
Waste pipe, connects preheating gas room, in order to gather the gas that combustion chambers burn produces;
Dry ice device, is connected with described effuser, is processed into dry ice in order to the described gas gathered by described effuser.
Another aspect of the present invention, also comprises the indirect preheating room be arranged at above kiln tail, in order to the Wingdale that preheating is to be calcined; Described preheating gas room is by pipeline and described rotary kiln combustion chamber UNICOM, and the waste gas that burning produces enters gas sampling pipe after the indirect preheating Wingdale of preheating gas room; Described preheating lime stone room and described rotary kiln urceolus calcined limestone room UNICOM, the gas of generation enters effuser through intermediate bin, preheater preheats Wingdale behind room;
Another aspect of the present invention, described gas sampling pipeline is connected with residual heat using device through dedusting, variable frequency adjustment blower fan.
Another aspect of the present invention, described effuser is connected with dry ice device through dedusting, waste-heat recovery device, variable frequency adjustment blower fan, and the waste heat of collection is connected with device for utilizing residual heat of waste gas.
Another aspect of the present invention, the belt transporting Wingdale is provided with above described preheating lime stone room, described belt is provided with a dumping device, in order to the discharge opening unloading Wingdale to top, described preheating lime stone room, described discharge opening is provided with closed cover plate.
Another aspect of the present invention, rotary kiln head is provided with water cooler, and cool fast in order to lime calcining produced, cooled lime is sent through transfer roller and entered finished bin.Freezing air takes away heat when cool lime, as secondary combustion-supporting wind.
Another aspect of the present invention, the fuel of described combustion chamber is coal dust and/or coal gas.
Another aspect of the present invention, described heat transfer wall is that fire-resistant heat-transfer matcrial or heat-resisting alloy steel are made.
Another aspect of the present invention, is also sequentially set with the refining plant in order to Purge gas between described effuser and described dry ice device, in order to the drying installation of dry gas, and in order to the pressurizing device by liquefaction of gases.
By the enforcement to technical solution of the present invention, following technique effect can be obtained:
1, quickened lime quality product is high, and product purity improves, and sulphur content reduces, and is particularly suitable for the interpolation slag making of smelting stainless steel and high strength, high-quality iron and steel kind;
2, calcination of lime is even, is easy to control, and activity degree is good.Under the prerequisite supplying qualified Wingdale and fuel, the activity degree of quickened lime reaches more than 360ml, and normal production does not produce or lower Extend position;
3, thermo-efficiency is high, decomposition temperature is easy to control, avoid energy dissipation, the per-cent accounting for total heat consumption for decomposition of limestone thermal losses is the highest in all kinds of kiln shape, unit product thermal losses is low, and can make full use of coal dust firing, or blast furnace, converter, coke oven and mixed gas carry out calcination as fuel;
The flue gas temperature of 4, discharging is high, and recoverable, is converted to steam and generates electricity;
The carbonic acid gas of 5, discharging is easy to purification, obtains pure carbonic acid gas, obtains food grade dry ice through processing treatment, industrial wastes is utilized effectively, and is conducive to solving the problem of environmental pollutions such as carbon emission;
7, can calcination 20-40mm small grain size Wingdale, the existing discarded limestone resource of China can be made full use of.
8, contrast common rotary kiln type, indirect calcination rotary kiln utilizes radiant heat calcination quickened lime, and whole system equipment is simple, easy temperature control; processing ease, easy to maintenance, cost is lower; meeting recycling economy, is the developing direction realizing lime manufacturing process energy-saving and emission-reduction and environment protection.
Accompanying drawing explanation
Fig. 1 is indirect production lime of the present invention, the structural representation reclaiming the rotary kiln apparatus and method of carbonic acid gas.
Fig. 2 is indirect production lime of the present invention, the schematic cross-section reclaiming the rotary kiln apparatus and method of carbonic acid gas.
Fig. 3 is indirect production lime of the present invention, the FB(flow block) reclaiming the rotary kiln device of carbonic acid gas.
Embodiment
Be described technical scheme of the present invention below by way of specific embodiment, with under the conflict free prerequisite of object of the present invention, the technical characteristic in the embodiment hereinafter mentioned and embodiment can combine mutually.
As shown in Figure 1, the technical solution adopted in the present invention is: utilize coal dust or coal gas to produce heat by heat transfer wall 19 in rotary kiln combustion chamber 10 combustion, make Wingdale be heated to 1050-1100 degree decomposition temperature and carry out indirect calcination, produce qualified high-performance quickened lime and pure carbonic acid gas, waste gas residual heat produces steam and is recycled utilization.
A kind of embodiment of the rotary kiln apparatus and method of indirect production lime of the present invention, recovery carbonic acid gas comprises: rotary kiln combustion chamber 10, in order to coal gas or coal dust firing, calcining compartment 11 treats calcined limestone in order to place, and is separated by heat transfer wall 19 and combustion chamber 10; Effuser 61, connects a plurality of preheating lime stone room 4, gathers the gas after preheating lime stone; In order to processing and fabricating dry ice; Waste pipe 81, connects a plurality of preheating gas room, gathers the waste gas after preheating lime stone, in order to heat recovery;
Embodiment of the present invention relates to indirect calcination and produces quickened lime, reclaims the rotary kiln device and method of carbonic acid gas, as shown in Figure 1, mainly comprising Wingdale is transported to above preheater by belt 21, Wingdale adds in preheating lime stone room 4 by discharge opening 2 by dumping device 1, discharge opening 2 there is cover plate, opened by dump car when discharging, close after discharging.Exhaust pipeline 81 is connected with a plurality of preheating gas room 5 by pipeline, heat is delivered in preheating lime stone room 4 by heat transfer wall 22 by the heat of preheating gas room 5, preheating is carried out to Wingdale, Wingdale after preheating is by after feeding machine 6 timing to intermediate bin 7 further preheating, by hydraulic push rod 8, Wingdale is delivered in rotary kiln 12 through feeding mouth 9, fast decoupled is carried out when arriving calcination band, enter the vertical cooling room 18 of kiln hood after decomposition to cool, the hot gas that cooling produces is circulated by pipeline and blower fan 16 as secondary combustion-supporting wind, the finished product ash cooled enters ash silo 17 and is delivered continuously to lime finished bin by belt.
The gas that in rotary kiln urceolus 11, calcined limestone produces, preheating lime stone is carried out through intermediate bin 7, preheating is carried out again through 4 pairs, a plurality of preheating lime stone room Wingdale, after collect through effuser 61, gas after collection is through fly-ash separator 62, variable frequency adjustment blower fan 63 enters carbonic acid gas waste heat recovery 64, the waste heat reclaimed enters boiler afterheat recovering device 84, carbonic acid gas after cooling enters drying installation 65 and carries out drying treatment, by pressurizing device 66, carbon dioxide condensing is become liquid after drying treatment, dry ice device 67 under low pressure evaporates rapidly, condense into the ice and snow shape solid matter formation dry ice that one piece of block compresses.
Rotary kiln burner 23 delivered to by gas line or Coal powder spray pipeline 14, secondary combustion-supporting wind delivers to combustion chamber 10 by blower fan 16 pipeline 15, the waste gas that rotary kiln combustion chamber 10 produces is connected with preheating gas room 5 by exhaust pipeline 20, preheating is carried out to material road sodalime stone, waste gas after preheating is collected by gas sampling pipe 81 and is sent dust-removal system 82, variable frequency adjustment blower fan 83 regulates the flow of waste gas automatically, enter waste heat boiler 84 afterwards, steam pockets 85 carries out waste heat recovery, and steam Song Quan factory steam pipe system residual heat using device 86 produced is for full factory or carry out cogeneration.
Shaft cooler 18 cools the lime after calcined by rotary kiln, cooled hot blast passes through burner blower 16, pipeline 15 as rotary kiln secondary combustion-supporting wind, burner fuel adopts coal gas or coal dust to be sent into by pipeline 14, burn in combustion chamber, and transfer heat in calcined by rotary kiln room 11 by heat transfer wall 19, calcined limestone.
Embodiment of the present invention relates to indirect calcination and produces lime, reclaims the rotary kiln device sectional view of carbonic acid gas, as shown in Figure 2.Rotary kiln 12 rotates by counterclockwise 26, and burner 23 is arranged on rotary kiln central position, and rotary kiln inner core 10 is as combustion chamber and by heat transfer wall 19, heat is passed to calcining compartment sodalime stone 24, and Wingdale 24 rolling thermally equivalent in rotary kiln 12 is calcined.Rotary kiln 12 outer wall adopts abrasion-proof and refractory thermal insulation layer 25, reduces calorific loss.
It should be noted that in embodiment, burner combustion system can adopt oxygen-enriched combusting further, energy-saving and cost-reducing, reduces costs.
It should be noted that in above-mentioned embodiment, the quantity of preheating lime stone room 4 and preheating gas room 5, carry out composite design according to lime actual production output.
In a kind of embodiment of the present invention, heat transfer wall 19 can adopt fire-resistant heat-transfer matcrial or steel alloy to make.
Be not difficult to find, the present invention is by utilizing radiant heat calcination quickened lime, separate completely isolated between combustion chamber and calcination, not only can obtain the quickened lime of higher quality, and pure carbonic acid gas can be recovered to, processing and manufacturing is food grade dry ice, and the high-temp waste gas that burning produces also can direct remanufacture steam, carries out secondary use.Avoid Wingdale to contact with coal dust, the direct of coal gas compared with other rotary kiln lime kilning cubic meter of stone methods, make quickened lime, carbonic acid gas cleaner, lower containing impurity such as S, P, for the production of domestic quickened lime, dry ice and the integrated application of resource open the new a kind of approach more having market outlook, really respond national policy, achieve recycling economy and low-carbon energy-saving reduces discharging.
The above embodiments are only that part of the present invention embodies; can not contain all of the present invention; on the basis of above-described embodiment and accompanying drawing; those skilled in the art can obtain more embodiment according to the present invention under the prerequisite not paying creative work; and similar transformation is carried out to other similar kiln types, therefore these embodiments obtained under not paying the prerequisite of creative work all should be included in protection scope of the present invention.
Claims (10)
1. indirectly produce lime, reclaim rotary kiln apparatus and method for carbonic acid gas, it is characterized in that, comprising:
Inner/outer tube rotary kiln
Inner core combustion chamber is set in rotary kiln, produces thermal source in order to burning;
Rotary kiln urceolus, is treated calcined limestone in order to place, and is separated by inner/outer tube insulated wall and combustion chamber;
Effuser, connects preheating material road, in order to gather the gas that rotary kiln urceolus lime calcining produces;
Waste pipe, connects preheating gas room, in order to gather the gas that combustion chambers burn produces;
Dry ice device, is connected with described effuser, is processed into dry ice in order to the described gas gathered by described effuser;
Waste-heat recovery device, is connected with described waste gas of combustion chamber pipe, and produces steam in order to the waste gas heat utilization gathered by described waste pipe.
2. as claimed in claim 1, indirectly produce lime, reclaim the rotary kiln apparatus and method of carbonic acid gas, characterized by further comprising the indirect preheating room be arranged at above kiln tail, in order to the Wingdale that preheating is to be calcined; Described preheating gas room is by pipeline and described rotary kiln combustion chamber UNICOM, and the waste gas that burning produces enters gas sampling pipe after the indirect preheating Wingdale of preheating gas room; Described preheating lime stone room and described rotary kiln urceolus calcined limestone room UNICOM, the gas of generation enters effuser through intermediate bin, preheating lime stone behind room.
3. as claimed in claim 1, indirectly produce lime, reclaim the rotary kiln apparatus and method of carbonic acid gas, it is characterized in that described gas sampling pipeline is connected with residual heat using device through dedusting, variable frequency adjustment blower fan.
4. as claimed in claim 1, the rotary kiln apparatus and method of indirect production lime, recovery carbonic acid gas, it is characterized in that described effuser is connected with dry ice device through dedusting, waste-heat recovery device, variable frequency adjustment blower fan, the waste heat of collection is connected with device for utilizing residual heat of waste gas.
5. as claimed in claim 1, the rotary kiln apparatus and method of indirect production lime, recovery carbonic acid gas, it is characterized in that above described preheating lime stone room, being provided with the belt transporting Wingdale, described belt is provided with a dumping device, in order to the discharge opening unloading Wingdale to top, described preheating lime stone room, described discharge opening is provided with closed cover plate.
6. as claimed in claim 1, indirectly produce lime, reclaim the rotary kiln apparatus and method of carbonic acid gas, it is characterized in that below preheater, intermediate bin correspondence arranges hydraulic push rod feeding machine, in order to be delivered in limestone kiln by the Wingdale after preheating.
7. as claimed in claim 1, the rotary kiln apparatus and method of indirect production lime, recovery carbonic acid gas, is characterized in that rotary kiln head is provided with water cooler, cool fast in order to quickened lime calcining produced, freezing air takes away heat when cool lime, as secondary combustion-supporting wind.
8. as claimed in claim 1, indirectly produce lime, reclaim the rotary kiln apparatus and method of carbonic acid gas, it is characterized in that the fuel of described combustion chamber is coal dust and/or coal gas, and combustion oxygen.
9. as claimed in claim 1, indirectly produce lime, reclaim the rotary kiln apparatus and method of carbonic acid gas, it is characterized in that described heat transfer wall is that fire-resistant heat-transfer matcrial or heat-resisting alloy steel are made.
10. as claimed in claim 1, the rotary kiln apparatus and method of indirect production lime, recovery carbonic acid gas, it is characterized in that the refining plant be also sequentially set with between described effuser and described dry ice device in order to Purge gas, in order to the drying installation of dry gas, and in order to the pressurizing device by liquefaction of gases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510064805.7A CN105314894A (en) | 2015-02-03 | 2015-02-03 | Rotary kiln device and method for indirectly producing lime and recycling carbon dioxide |
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| CN201510064805.7A CN105314894A (en) | 2015-02-03 | 2015-02-03 | Rotary kiln device and method for indirectly producing lime and recycling carbon dioxide |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106705656A (en) * | 2017-01-20 | 2017-05-24 | 重庆鹏越科技发展有限公司 | Calcining kiln for titanium dioxide |
| CN108863114A (en) * | 2018-07-06 | 2018-11-23 | 沈阳化工大学 | A kind of method that the light-burned process waste heat of magnesite recycles |
| CN110470131A (en) * | 2019-06-26 | 2019-11-19 | 贾中瑞 | A kind of sleeve is every scorching calcining kiln |
| CN111076536A (en) * | 2019-12-27 | 2020-04-28 | 天津健威泽节能环保科技股份有限公司 | External heating type rotary kiln for calcining carbonate minerals, waste heat recovery system and implementation method |
| CN112923735A (en) * | 2021-01-29 | 2021-06-08 | 中信重工机械股份有限公司 | Flue gas waste heat utilization type preheater of lime rotary kiln |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106705656A (en) * | 2017-01-20 | 2017-05-24 | 重庆鹏越科技发展有限公司 | Calcining kiln for titanium dioxide |
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| CN110470131A (en) * | 2019-06-26 | 2019-11-19 | 贾中瑞 | A kind of sleeve is every scorching calcining kiln |
| CN111076536A (en) * | 2019-12-27 | 2020-04-28 | 天津健威泽节能环保科技股份有限公司 | External heating type rotary kiln for calcining carbonate minerals, waste heat recovery system and implementation method |
| CN112923735A (en) * | 2021-01-29 | 2021-06-08 | 中信重工机械股份有限公司 | Flue gas waste heat utilization type preheater of lime rotary kiln |
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