CN102851488B - High temperature flue gas anti-glass arsenic waste heat recovery system of roasting dearsenification and method thereof - Google Patents
High temperature flue gas anti-glass arsenic waste heat recovery system of roasting dearsenification and method thereof Download PDFInfo
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- CN102851488B CN102851488B CN2012101252848A CN201210125284A CN102851488B CN 102851488 B CN102851488 B CN 102851488B CN 2012101252848 A CN2012101252848 A CN 2012101252848A CN 201210125284 A CN201210125284 A CN 201210125284A CN 102851488 B CN102851488 B CN 102851488B
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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
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Abstract
The invention discloses a high temperature flue gas anti-glass arsenic waste heat recovery system of roasting dearsenification and a method thereof. The system comprises an indirect heat exchanger, a coal economizer, and a driving fan, wherein one pipe of the upper end air outlet of the indirect heat exchanger is connected with the coal economizer, the other pipe is connected with the driving fan, the air outlet pipe of the coal economizer is connected with the indirect driving fan, and the air outlet pipe of the driving fan is connected with the lower end air inlet of the indirect heat exchanger. According to the invention, by controlling the high temperature flue gas and hot air temperature, the temperature of the pipe wall of the indirect heat exchanger is controlled, thus the coagulation of the glass arsenic is effectively prevented, and an efficient cooling circulatory system is formed.
Description
Technical field
The present invention relates to residual heat and energy recovery technology field, particularly the anti-glass arsenic residual neat recovering system of a kind of high-temperature flue gas of roasting for arsenic removal and method thereof.
Background technology
Since the last century the eighties, along with the high speed development of China's gold industry, easily processed gold ore resource and reduced gradually, easily soak gold resource and almost be utilized, and difficult soaking with utmost point refractory mineral accounts for 60% of gold total reserves, the difficult-treating gold mine resource is demanded exploitation urgently.Difficulty is soaked with utmost point refractory mineral and is characterized in that harmful element As content is higher, adopts the conventional cyanidation gold extraction technology, and gold leaching rate is extremely low, and consumes a large amount of sodium cyanides.At present, the Technique of Refractory Gold Ores pretreatment technology of having grasped both at home and abroad has: heat pressuring oxidation method, microbial oxidation, roasting oxidation method etc.The heat pressuring oxidation method is because conditions such as high temperature, high pressure, pure oxygen, equipment and materials, sealing, self-service instrument and Controlling System required very high, and domestic do not have a suitability for industrialized production.Microbial oxidation is obtained very ten-strike in China, the selection of bacterial classification, the range of application of temperature, the optimization of equipment etc. has marked improvement, but this method is unfavorable for the comprehensive recovery of other valuable element, so the application of microbial oxidation also has certain limitation.Roasting is the To Several Traditional Preconditioning Methods of refractory gold ore, and along with the progress of technology and the demand in market, two sections fluidized bed roasting preconditioning techniques in recent years developing have brought new machine for the industrial application of this traditional technology.Use dearsenification desulfurization two-stage calcination technology, China recent years is built up the gold smelting projects such as Zhaoyuan, Mouping, Central-South, Tongguan in succession, also founds the factory in succession in Hunan, Fujian, Xinjiang.
In the roasting for arsenic removal desulfurization solution of gold smelting plant production process, adopt steel surface cooler or air cooler when ubiquity contains the arsenic high-temperature flue gas and tentatively cools off (being down to 400 ℃ for 600 ℃-700 ℃), speed of cooling is slow, and high-temperature flue gas heat energy is distributed in the surrounding environment and wastes; What is more important, the glassy arsenic oxide arsenoxide crystal of the very fast attached knot of surface cooler internal surface, more knot is thicker, causes to produce to pause, even adopt the way of manually beaing or vibrating also to be difficult to remove, finally causes surface cooler to lose efficacy, and has to remove refill the new system surface cooler; Because the surface cooler replacing time is long, have a strong impact on the driving operating rate of roasting system, the useless surface cooler difficult treatment of the included glass arsenic of dismounting, contaminate environment, it is healthy to diminish operator.
In the roasting for arsenic removal desulfurization solution of gold smelting plant production process, existence contains the arsenic high-temperature flue gas and tentatively cools off, external certain technology company adopts the water spraying atomization method to cool off fast (being down to 400 ℃ for 650 ℃), for example Chinese patent ZL200720057284.3 discloses a kind of flue gas waste heat recovery energy-saving, adopt pre-spray equipment, so that high-temperature flue gas is by gas approach the time, directly contact mixed heat transfer with spraying cooling water smoke, although can solve glass arsenic attachment issue in the process of cooling, but a large amount of water enters high-temperature flue gas and vaporization, in the flue gas therefore the too high subsequent technique equipment that causes of moisture very easily corrode, flue gas just is converted and is not utilized.
Summary of the invention
The present invention provides a kind for the treatment of capacity large for solving the problems of the technologies described above, high-temperature flue gas residual neat recovering system and the method thereof of the anti-glass arsenic of the obvious roasting for arsenic removal of energy-saving effect.
The present invention is directed to above-mentioned technical problem, provide following technical scheme: the high-temperature flue gas residual neat recovering system of the anti-glass arsenic of a kind of roasting for arsenic removal, comprise indirect heat exchanger, economizer, driving blower fan, the pipeline of upper end air outlet that it is characterized in that indirect heat exchanger connects economizer, another pipeline connects the driving blower fan, the air outlet pipeline of economizer connects the driving blower fan, and the air outlet pipeline that drives blower fan connects the lower end blast inlet of indirect heat exchanger.
Further improvement as the high-temperature flue gas residual neat recovering system of the anti-glass arsenic of roasting for arsenic removal of the present invention is respectively arranged with chimney valve on the blast inlet pipeline of economizer and on the air outlet pipeline.
As the further improvement of the high-temperature flue gas residual neat recovering system of the anti-glass arsenic of roasting for arsenic removal of the present invention, be provided with by-pass valve on indirect heat exchanger and the connecting tube that drives blower fan.
The high-temperature flue gas exhaust heat recovering method of the anti-glass arsenic of a kind of roasting for arsenic removal is characterized in that:
550 ℃-850 ℃ the high-temperature flue gas that produces when (1) roasting for arsenic removal desulfurization solution of gold smelting plant is produced enters first the shell side of indirect heat exchanger by the upper end inlet mouth of indirect heat exchanger, this moment, chimney valve was closed, by-pass valve is opened, progressively regulate driving the blower fan load, make the normal temperature air in the indirect heat exchanger tube side be heated to 230 ℃-260 ℃ by high-temperature flue gas;
(2) progressively close by-pass valve, open chimney valve, ducted 230 ℃-260 ℃ driven blower fan of warm air is squeezed into the lower end blast inlet of indirect heat exchanger, warm air and high-temperature flue gas carry out heat exchange again, high-temperature flue gas is cooled to 360 ℃-400 ℃, warm air beating to 400 ℃-480 ℃, thus the heat exchange tube wall temperature in the indirect heat exchanger is controlled at 270 ℃-300 ℃;
(3) cooled high-temperature flue gas enters the electric precipitator dedusting, warm air after being heated enters economizer production steam or hot water by the upper end air outlet of indirect heat exchanger, the warm air that economizer is discharged enters the driving blower fan by pipeline, forms cooling recirculation system.
Beneficial effect of the present invention: 1, dearsenification desulphurizing roasting process high-temperature obvious heat of smoke takes full advantage of, and by indirect heat exchange, waste heat is used for producing steam or heating water, and energy recovery is worth large, meets the energy-saving and emission-reduction requirement; 2, processing method equipment used investment of the present invention is less, and it is wide to use roasting for arsenic removal smelting industrial scale scope, is applied in especially and day processes scale roasting for arsenic removal desulfurization smelting system more than 200 tons, and energy-saving effect is more obvious.
Description of drawings
Fig. 1 is structural representation of the present invention.
Embodiment
The high-temperature flue gas residual neat recovering system of the anti-glass arsenic of a kind of roasting for arsenic removal, comprise indirect heat exchanger 1, economizer 2, drive blower fan 3, pipeline of the upper end air outlet of indirect heat exchanger 1 connects economizer 2, another pipeline connects driving blower fan 3, the air outlet pipeline of economizer 2 connects driving blower fan 3, the air outlet pipeline that drives blower fan 3 connects the lower end blast inlet of indirect heat exchanger 1, be respectively arranged with chimney valve 4 on the blast inlet pipeline of economizer 2 and on the air outlet pipeline, be provided with by-pass valve 5 on the connecting tube of indirect heat exchanger 1 and driving blower fan 3.
The high-temperature flue gas exhaust heat recovering method of the anti-glass arsenic of a kind of roasting for arsenic removal is characterized in that:
550 ℃-850 ℃ the high-temperature flue gas that produces when (1) roasting for arsenic removal desulfurization solution of gold smelting plant is produced enters first the shell side of indirect heat exchanger by the upper end inlet mouth of indirect heat exchanger, this moment, chimney valve was closed, by-pass valve is opened, progressively regulate driving the blower fan load, make the normal temperature air in the indirect heat exchanger tube side be heated to 230 ℃-260 ℃ by high-temperature flue gas;
(2) progressively close by-pass valve, open chimney valve, ducted 230 ℃-260 ℃ driven blower fan of warm air is squeezed into the lower end blast inlet of indirect heat exchanger, warm air and high-temperature flue gas carry out heat exchange again, high-temperature flue gas is cooled to 360 ℃-400 ℃, warm air beating to 400 ℃-480 ℃, thus the heat exchange tube wall temperature in the indirect heat exchanger is controlled at 270 ℃-300 ℃;
(3) cooled high-temperature flue gas enters the electric precipitator dedusting, warm air after being heated enters economizer production steam or hot water by the upper end air outlet of indirect heat exchanger, the warm air that economizer is discharged enters the driving blower fan by pipeline, forms cooling recirculation system.
The high-temperature flue gas of roasting for arsenic removal fills into warm air and carries out the secondary oxidation burning after one-level or secondary cyclone dust removal, makes As
4, As
6, As
4S
6, S
4, S
2Further burn into As Deng steam
2O
3, SO
2, arsenic is existed with the sulfurous gas form with arsenious oxide, sulphur, the subsequent technique that is conducive to arsenic and sulphur reclaims; A large amount of heat is emitted in the combustiblematerials secondary combustion in the high-temperature flue gas, 30-50 ℃ of high-temperature flue-gas rising, thereby high-temperature flue-gas reaches 550 ℃-850 ℃, flue gas enters in as shown in Figure 1 the indirect heat exchanger 1 and flows from top to bottom, carry out heat exchange with from bottom to top 230 ℃-260 ℃ warm air in the indirect heat exchanger 1, flue gas is cooled to 360-400 ℃, warm air is heated to 400-480 ℃, by with the gas fume control of indirect heat exchanger upper end blast inlet at 550 ℃-850 ℃, and the warm air of lower end blast inlet is controlled at 230 ℃-260 ℃, thereby guarantee to be controlled at 270-300 ℃ in the heat transfer tube wall temperature of heat transfer process indirect interchanger 1, and then guarantee that glass arsenic can not be attached on the inner tubal wall of indirect heat exchanger 1 by curding out; Heated air causes 2 pairs of economizers of economizer 2 and discharges heat energy, and steam or hot water are produced in the feedwater of heating economizer 2, realizes that the heat energy cleaning reclaims, and warm air goes out economizer 2 temperature about 270 ℃; Going out economizer 2 air provides kinetic energy by driving blower fan 3, keeps air cycle, and recirculated air pressure is higher than the high-temperature flue gas pressure of roasting for arsenic removal in indirect heat exchanger 1 shell.
Claims (1)
1. a high-temperature flue gas residual neat recovering system that utilizes the anti-glass arsenic of roasting for arsenic removal reclaims the method for high-temperature flue gas waste heat, described system comprises indirect heat exchanger, economizer, drive blower fan, pipeline of the upper end air outlet of indirect heat exchanger connects economizer, another pipeline connects the driving blower fan, the air outlet pipeline of economizer connects the driving blower fan, the air outlet pipeline that drives blower fan connects the lower end blast inlet of indirect heat exchanger, be respectively arranged with chimney valve on the blast inlet pipeline of economizer and on the air outlet pipeline, be provided with by-pass valve on the connecting tube of indirect heat exchanger and driving blower fan, it is characterized in that:
550 ℃-850 ℃ the high-temperature flue gas that produces when (1) roasting for arsenic removal desulfurization solution of gold smelting plant is produced enters first the shell side of indirect heat exchanger by the upper end inlet mouth of indirect heat exchanger, this moment, chimney valve was closed, by-pass valve is opened, progressively regulate driving the blower fan load, make the normal temperature air in the indirect heat exchanger tube side be heated to 230 ℃-260 ℃ by high-temperature flue gas;
(2) progressively close by-pass valve, open chimney valve, ducted 230 ℃-260 ℃ driven blower fan of warm air is squeezed into the lower end blast inlet of indirect heat exchanger, warm air and high-temperature flue gas carry out heat exchange again, high-temperature flue gas is cooled to 360 ℃-400 ℃, warm air beating to 400 ℃-480 ℃, thus the heat exchange tube wall temperature in the indirect heat exchanger is controlled at 270 ℃-300 ℃;
(3) cooled high-temperature flue gas enters the electric precipitator dedusting, warm air after being heated enters economizer production steam or hot water by the upper end air outlet of indirect heat exchanger, the warm air that economizer is discharged enters the driving blower fan by pipeline, forms cooling recirculation system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101252848A CN102851488B (en) | 2012-04-26 | 2012-04-26 | High temperature flue gas anti-glass arsenic waste heat recovery system of roasting dearsenification and method thereof |
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| CN2012101252848A CN102851488B (en) | 2012-04-26 | 2012-04-26 | High temperature flue gas anti-glass arsenic waste heat recovery system of roasting dearsenification and method thereof |
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| CN102851488B true CN102851488B (en) | 2013-10-23 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101476015A (en) * | 2008-01-02 | 2009-07-08 | 中冶京诚工程技术有限公司 | AOD converter flue gas waste heat recovery apparatus |
| CN101598511A (en) * | 2008-06-04 | 2009-12-09 | 中冶赛迪工程技术股份有限公司 | A kind of gas cooling system |
| CN201852475U (en) * | 2010-10-29 | 2011-06-01 | 谢平伟 | Flue gas waste heat recycling device |
| CN202576517U (en) * | 2012-04-26 | 2012-12-05 | 宜兴市化工成套设备有限公司 | Glass arsenic-preventing waste heat recovering system for high-temperature flue gas generated by removing arsenic by roasting |
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- 2012-04-26 CN CN2012101252848A patent/CN102851488B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101476015A (en) * | 2008-01-02 | 2009-07-08 | 中冶京诚工程技术有限公司 | AOD converter flue gas waste heat recovery apparatus |
| CN101598511A (en) * | 2008-06-04 | 2009-12-09 | 中冶赛迪工程技术股份有限公司 | A kind of gas cooling system |
| CN201852475U (en) * | 2010-10-29 | 2011-06-01 | 谢平伟 | Flue gas waste heat recycling device |
| CN202576517U (en) * | 2012-04-26 | 2012-12-05 | 宜兴市化工成套设备有限公司 | Glass arsenic-preventing waste heat recovering system for high-temperature flue gas generated by removing arsenic by roasting |
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Owner name: SHUANGDUN ENVIRONMENTAL TECHNOLOGY CO., LTD. Free format text: FORMER NAME: YIXING CHEMICAL INDUSTRY COMPLETE-SET EQUIPMENT CO., LTD. |
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Address after: Huankeyuan garden 214205 Yixing Road, Jiangsu city of Wuxi province No. 105 Patentee after: SHUANGDUN ENVIRONMENT TECHNOLOGY CO., LTD. Address before: Huankeyuan garden 214205 Yixing Road, Jiangsu city of Wuxi province No. 105 Patentee before: Yixing City Chemical Industry Complete Equipment Co., Ltd. |