CN105485670A - Optimized combustion method for gaseous suspension calciner of alumina plant and dedicated device - Google Patents
Optimized combustion method for gaseous suspension calciner of alumina plant and dedicated device Download PDFInfo
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- CN105485670A CN105485670A CN201410479733.8A CN201410479733A CN105485670A CN 105485670 A CN105485670 A CN 105485670A CN 201410479733 A CN201410479733 A CN 201410479733A CN 105485670 A CN105485670 A CN 105485670A
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention relates to the field of gaseous suspension calciners of alumina plants, particularly to an optimized combustion method for a gaseous suspension calciner in a calcination process of an alumina plant and a dedicated device. Two stages of combustion processes are adopted on a pipeline between an outlet in the top of a cyclone cooler CO1 and the bottom of a main calciner PO4; 5%-10% of the fuel volume required by gaseous suspension calcination is led in the first stage of the combustion process, and combustion-supporting air is heated up by combustion heat release; and in the second stage of the combustion process, combined combustion of the rest of the fuel gas and the combustion-supporting airis achieved. Preheating burners with the function of four-stage preheating are installed on a preheating combustion pipe at a bend of thepipeline from the cyclone cooler CO1 to the main calciner PO4 and used for preheating the combustion-supporting air by stages step bystep. Main burners are installed at a position where the combustion-supporting air enters at the bottom of the main calciner PO4, and 90%-95% of the fuel volume required by gaseous suspension calcination is led into the main burners. According to the optimized combustion method, the technology is simple, fewerworking procedures are achieved, the device investment is low, the result takes effect rapidly, the product quality is high and the environmental protection effect is remarkable.
Description
Technical field
The present invention relates to alumina producer gaseous pollutant control field, be specially Optimizing Combustion method and the special equipment of gaseous pollutant control in a kind of alumina producer calcining process.
Background technology
At present, gaseous pollutant control is low owing to having energy resource consumption, and the daily output is large, and widely, its fuel is mainly with natural gas, and coke-stove gas and producer gas etc. are as origin of heat in alumina producer application at home and abroad.But; along with the fast development of Chinese society's economy; to the requirement of product quality and environmental protection more and more stricter, gaseous pollutant control is pyrometallurgy, and the exhaust gas volumn of generation is huge; and harmful substances from flue gases is more; add follow-up environmental protection treatment expense, by the optimization of gaseous pollutant control and improvement, improve the quality of products on the one hand; reduce the content of harmful substances from flue gases on the one hand, thus the corresponding production cost reducing alumina producer.
Summary of the invention
In order to solve the problems of the technologies described above, the object of the present invention is to provide a kind of Optimizing Combustion method and special equipment of alumina producer gaseous pollutant control, alumina producer finished product rate can be improved, improve roasted product quality, and make flue gas meet the requirement of environmental protection, the discharge of poisonous waste such as the oxynitrides in reduction flue gas and carbon monoxide, reach environment-friendly high-efficiency requirement.
For reaching above-mentioned purpose, technical scheme of the present invention is:
A kind of Optimizing Combustion method of alumina producer gaseous pollutant control, on pipeline between bottom cooling cyclone CO1 top exit to main roaster PO4, adopt two stage combustion operation, pass into 5% ~ 10% of gas suspension calcination gas quantity volume used in first paragraph burning operation, combustion heat release heats up to combustion air; Remaining combustion gas and combustion air mixed combustion in second segment burning operation.
The Optimizing Combustion method of described alumina producer gaseous pollutant control, in first paragraph burning operation, 5% ~ 10% fuel gas buring releases heat, combustion air is heated up significantly, thus make combustion air reach a higher temperature, combustion air temperature from cooling cyclone CO1 is brought up to 900 DEG C ~ 1000 DEG C from 700 DEG C ~ 800 DEG C, and the oxysome volume concentrations in combustion air is diluted to 2% ~ 10% by the exhaust gas volumn produced.
The Optimizing Combustion method of described alumina producer gaseous pollutant control, combustion air is after intensification and flue gas dilution, and the combustion air becoming high-temperature low-oxygen concentration, in second segment burning operation and remaining combustion gas mixing, burns.
The Optimizing Combustion method of described alumina producer gaseous pollutant control, the pipeline bending place preheated burning pipe of cooling cyclone CO1 to main roaster PO4 is installed the preheat burner of level Four preheating, carries out step by step preheating stage by stage to combustion air.
The Optimizing Combustion method of described alumina producer gaseous pollutant control, enters combustion air place and installs main burner, pass into 90% ~ 95% of gas suspension calcination gas quantity volume used bottom main roaster PO4.
The special equipment of the Optimizing Combustion method of described alumina producer gaseous pollutant control, this equipment comprises main roaster PO4, aluminium hydroxide import, main combustion tube, preheated burning pipe, combustion-aid air pipe, main burner, preheat burner and cooling cyclone CO1, and concrete structure is as follows:
Between cooling cyclone CO1 top exit, S shape pipeline connection is passed through bottom main roaster PO4, this S shape pipeline sets gradually main combustion tube, preheated burning pipe, combustion-aid air pipe, main combustion tube arranges main burner, preheated burning pipe arranges preheat burner; One end of combustion-aid air pipe communicates with cooling cyclone CO1 top exit, and the other end of combustion-aid air pipe communicates with the entrance point of preheated burning pipe; The port of export of preheated burning pipe is communicated with the entrance point of main combustion tube, and the port of export of main combustion tube is communicated with the entrance point of main roaster PO4, and main roaster PO4 arranges aluminium hydroxide import.
Described special equipment, combustion-aid air pipe is flat inverted-loop tube, preheated burning pipe is the V-arrangement pipe of bending structure, the both sides of V-arrangement pipe are symmetrical arranged two-stage preheat burner, form level Four preheat burner, adopt V-arrangement pipe and level Four preheat burner, combustion gas is fully mixed with combustion air, by step by step stage by stage heating ensure that combustion air to reach 900 DEG C ~ 1000 DEG C of setting from 700 DEG C ~ 800 DEG C, and exhaust gas volumn is increased, fully to dilute the oxysome volume concentrations 2% ~ 10% in combustion air.
Design philosophy of the present invention is:
Optimizing Combustion technology of the present invention adopts two stage combustion operation.First first paragraph burning operation passes into a small amount of combustion gas and burns, and fuel gas buring releases the temperature that heat improves combustion air further, and the flue gas product after burning is mixed in combustion air, thus dilutes the concentration of oxygen in combustion air; High-temperature low-oxygen combustion air enters second segment burning operation, due to the significantly raising of combustion air temperature, significantly can expand the roasting quality of combustion zone and raising product aluminium oxide; Low oxygen combustion makes roaster combustion region expand and be evenly distributed, and fuel gas buring is complete, eliminates concentrated combustion region, reduces the content of oxynitrides and carbon monoxide in flue gas.
Advantage of the present invention and beneficial effect as follows:
1, the present invention is by carrying out preheated burning to combustion air, the temperature of further raising combustion air, the temperature of combustion air is higher, the main roaster PO4 fuel gas buring of its gaseous pollutant control is more abundant, avoiding combustion gas because of imperfect combustion causes the waste of combustion gas, the flue gas produced after fuel gas buring in preheat burner dilutes combustion air, thus reduces the oxygen concentration of combustion air, and combustion air is reached a high temperature hypoxia; In stove, combustion air is when being in very high temperature, combustion reaction can occur, and combustion zone is evenly distributed, avoids concentrated combustion, present overall distribution when oxygen content is 2%, and alumina product yield rate is high, and quality is good.
2, the present invention adopts Optimizing Combustion technology to make main roaster PO4 combustion area distribution evenly extensive, centralized combustion zone traditional before changing, thus central temperature is reduced, reduce the thermodynamics oxynitrides because localized regions of elevated temperature produces, reduce the content of oxynitrides in flue gas, make flue gas reach the requirement of environmental protection; The combustion air of low oxygen concentration makes main roaster PO4 combustion area distribution even, eliminates localized hyperthermia's phenomenon, avoids causing very serious impact to equipment and refractory material.
3, calcining process energy consumption accounts for about 25% ~ 30% of whole alumina producer energy ezpenditure, adopts roasting technology of the present invention, improves the quality of alumina product on the one hand, reduces the harmful components in flue gas on the one hand, thus improves the competitiveness of alumina producer.
4, present invention process is simple, and operation is few, and equipment investment is few, achievement instant effect, and product quality is high and environment protecting is remarkable.
Accompanying drawing explanation
Fig. 1 is the flow chart of the Optimizing Combustion method of alumina producer gaseous pollutant control of the present invention.In figure, 1 aluminium hydroxide import; 2 main combustion tubes; 3 preheated burning pipes; 4 combustion-aid air pipes; 5 main burners; 6 preheat burners.
Detailed description of the invention
Below embodiments of the invention are described in detail by reference to the accompanying drawings, but protection scope of the present invention not limit by embodiment.
As shown in Figure 1, the Optimizing Combustion equipment of alumina producer gaseous pollutant control of the present invention comprises main roaster PO4, aluminium hydroxide import 1, main combustion tube 2, preheated burning pipe 3, combustion-aid air pipe 4, main burner 5, preheat burner 6 and cooling cyclone CO1 etc., and concrete structure is as follows:
Between cooling cyclone CO1 top exit, S shape pipeline connection is passed through bottom main roaster PO4, this S shape pipeline sets gradually main combustion tube 2, preheated burning pipe 3, combustion-aid air pipe 4, main combustion tube 2 arranges main burner 5, preheated burning pipe 3 is arranged preheat burner 6; One end of combustion-aid air pipe 4 communicates with cooling cyclone CO1 top exit, and the other end of combustion-aid air pipe 4 communicates with the entrance point of preheated burning pipe 3; The port of export of preheated burning pipe 3 is communicated with the entrance point of main combustion tube 2, and the port of export of main combustion tube 2 is communicated with the entrance point of main roaster PO4, and main roaster PO4 arranges aluminium hydroxide import 1.
Combustion-aid air pipe 4 is flat inverted-loop tube, combustion air by rising, the flow direction of level and decline, combustion air can be made steadily to enter preheated burning pipe 3.Preheated burning pipe 3 is the V-arrangement pipe of bending structure, and the both sides of V-arrangement pipe are symmetrical arranged two-stage preheat burner 6, forms level Four preheat burner.Adopt specific V-arrangement pipe and level Four preheat burner, the flow velocity of combustion air, combustion gas and flue gas can be cushioned, combustion gas fully mixes with combustion air, by step by step stage by stage heating ensure that combustion air to reach 900 DEG C ~ 1000 DEG C of setting from 700 DEG C ~ 800 DEG C, and exhaust gas volumn is increased, fully to dilute the oxysome volume concentrations 2% ~ 10% in combustion air.
The Optimizing Combustion method of alumina producer gaseous pollutant control of the present invention, main roaster PO4 adopts two stage combustion operation, and pass into the combustion gas of 5% ~ 10% in first paragraph burning operation, combustion heat release heats up to combustion air; Combustion gas and combustion air mixed combustion in second segment burning operation.When combustion air enters main roaster PO4, be first pass into a small amount of combustion gas in preheat burner to burn, improve the temperature of combustion air on the one hand, on the one hand oxygen content in dilution combustion air.Then, the combustion air after heating up and diluting and main burner place carry out combustion reaction.
Embodiment
Alumina producer gaseous pollutant control Optimizing Combustion technology of the present invention, adopts two stage combustion operation.5% ~ 10% of gas suspension calcination combustion gas volume used is passed in first paragraph burning operation, by fuel gas buring heat release, the combustion air from cooling cyclone CO1 is heated to 900 DEG C ~ about 1000 DEG C from 700 DEG C ~ 800 DEG C, and the oxysome volume concentrations in combustion air is diluted to about 2% ~ 10% by the exhaust gas volumn produced, the high-temperature low-oxygen combustion air after first paragraph burning operation burns after second segment burning operation and remaining a large amount of combustion gas mixing.Because the temperature of combustion air significantly improves, thus second segment is burnt combustion gas Thorough combustion in operation, reaches 100% state, avoid because of non-complete combustion of fuel cause the waste of the energy.Low oxygen combustion makes main roaster PO4 combustion region area expand, in-furnace temperature is evenly distributed, make the conversion ratio of aluminium hydroxide dehydration reaction generation aluminium oxide high, finished product rate is high, good product quality, avoid the concentrated combustion of stove internal cause and reduce product and burn till rate, reducing the discharge capacity of oxynitrides and carbon monoxide.
Result shows, the present invention can significantly improve the combustion efficiency of combustion gas in alumina producer calcining process, and reduce the discharge capacity of oxynitrides and carbon monoxide harmful substance in flue gas, after roasting, product quality is high, increases enterprise vitality and competitiveness.It is low that the present invention has equipment cost, and energy consumption is little, simple to operate, and usability is strong, has good industrial prospect.
Claims (7)
1. the Optimizing Combustion method of an alumina producer gaseous pollutant control, it is characterized in that, on pipeline between bottom cooling cyclone CO1 top exit to main roaster PO4, adopt two stage combustion operation, pass into 5% ~ 10% of gas suspension calcination gas quantity volume used in first paragraph burning operation, combustion heat release heats up to combustion air; Remaining combustion gas and combustion air mixed combustion in second segment burning operation.
2. the Optimizing Combustion method of alumina producer gaseous pollutant control according to claim 1, it is characterized in that, in first paragraph burning operation, 5% ~ 10% fuel gas buring releases heat, combustion air is heated up significantly, thus make combustion air reach a higher temperature, combustion air temperature from cooling cyclone CO1 is brought up to 900 DEG C ~ 1000 DEG C from 700 DEG C ~ 800 DEG C, and the oxysome volume concentrations in combustion air is diluted to 2% ~ 10% by the exhaust gas volumn produced.
3. the Optimizing Combustion method of alumina producer gaseous pollutant control according to claim 2, it is characterized in that, combustion air is after intensification and flue gas dilution, and the combustion air becoming high-temperature low-oxygen concentration, in second segment burning operation and remaining combustion gas mixing, burns.
4. the Optimizing Combustion method of alumina producer gaseous pollutant control according to claim 1, it is characterized in that, the pipeline bending place preheated burning pipe of cooling cyclone CO1 to main roaster PO4 is installed the preheat burner of level Four preheating, preheating is stage by stage carried out step by step to combustion air.
5. the Optimizing Combustion method of alumina producer gaseous pollutant control according to claim 1, is characterized in that, enters combustion air place and installs main burner, pass into 90% ~ 95% of gas suspension calcination gas quantity volume used bottom main roaster PO4.
6. the special equipment of the Optimizing Combustion method of the alumina producer gaseous pollutant control that one of claim 1 to 5 is described, it is characterized in that, this equipment comprises main roaster PO4, aluminium hydroxide import, main combustion tube, preheated burning pipe, combustion-aid air pipe, main burner, preheat burner and cooling cyclone CO1, and concrete structure is as follows:
Between cooling cyclone CO1 top exit, S shape pipeline connection is passed through bottom main roaster PO4, this S shape pipeline sets gradually main combustion tube, preheated burning pipe, combustion-aid air pipe, main combustion tube arranges main burner, preheated burning pipe arranges preheat burner; One end of combustion-aid air pipe communicates with cooling cyclone CO1 top exit, and the other end of combustion-aid air pipe communicates with the entrance point of preheated burning pipe; The port of export of preheated burning pipe is communicated with the entrance point of main combustion tube, and the port of export of main combustion tube is communicated with the entrance point of main roaster PO4, and main roaster PO4 arranges aluminium hydroxide import.
7. special equipment according to claim 6, it is characterized in that, combustion-aid air pipe is flat inverted-loop tube, preheated burning pipe is the V-arrangement pipe of bending structure, the both sides of V-arrangement pipe are symmetrical arranged two-stage preheat burner, form level Four preheat burner, adopt V-arrangement pipe and level Four preheat burner, combustion gas is fully mixed with combustion air, by step by step stage by stage heating ensure that combustion air to reach 900 DEG C ~ 1000 DEG C of setting from 700 DEG C ~ 800 DEG C, and exhaust gas volumn is increased, fully to dilute the oxysome volume concentrations 2% ~ 10% in combustion air.
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| CN201410479733.8A CN105485670B (en) | 2014-09-18 | 2014-09-18 | The optimization combustion method and special equipment of a kind of alumina producer gaseous pollutant control |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107559826A (en) * | 2017-10-10 | 2018-01-09 | 安徽科达洁能股份有限公司 | A kind of suspension roaster staged combustion systems and its application |
| CN107606949A (en) * | 2017-09-27 | 2018-01-19 | 河南科达东大国际工程有限公司 | A kind of gas suspension calcination of aluminium hydroxide stove low-temperature bake device |
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| US20100095649A1 (en) * | 2008-10-20 | 2010-04-22 | General Electric Company | Staged combustion systems and methods |
| CN101870492A (en) * | 2010-07-14 | 2010-10-27 | 河南东大泰隆冶金科技有限公司 | New technology for gas suspension calcination of aluminium hydroxide |
| CN103708515A (en) * | 2014-01-10 | 2014-04-09 | 洛阳水泥工程设计研究院有限公司 | Method for producing alpha-Al2O3 by employing predecomposition technology and taking aluminium hydrogen as raw material |
| CN103771476A (en) * | 2014-01-26 | 2014-05-07 | 郑州金阳光陶瓷有限公司 | Method for producing alpha-aluminum oxide by utilizing gas-suspension roasting furnace |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0666421A (en) * | 1992-02-07 | 1994-03-08 | Furness Techno:Kk | Combustion device |
| US20100095649A1 (en) * | 2008-10-20 | 2010-04-22 | General Electric Company | Staged combustion systems and methods |
| CN101870492A (en) * | 2010-07-14 | 2010-10-27 | 河南东大泰隆冶金科技有限公司 | New technology for gas suspension calcination of aluminium hydroxide |
| CN103708515A (en) * | 2014-01-10 | 2014-04-09 | 洛阳水泥工程设计研究院有限公司 | Method for producing alpha-Al2O3 by employing predecomposition technology and taking aluminium hydrogen as raw material |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107606949A (en) * | 2017-09-27 | 2018-01-19 | 河南科达东大国际工程有限公司 | A kind of gas suspension calcination of aluminium hydroxide stove low-temperature bake device |
| CN107559826A (en) * | 2017-10-10 | 2018-01-09 | 安徽科达洁能股份有限公司 | A kind of suspension roaster staged combustion systems and its application |
| CN107559826B (en) * | 2017-10-10 | 2024-05-10 | 安徽科达洁能股份有限公司 | Graded combustion system of suspension roasting furnace and application thereof |
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| CN105485670B (en) | 2018-03-20 |
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