CN102445088A - Method and device for inhibiting slagging of copper flash smelting waste heat boiler - Google Patents
Method and device for inhibiting slagging of copper flash smelting waste heat boiler Download PDFInfo
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- CN102445088A CN102445088A CN2011104029170A CN201110402917A CN102445088A CN 102445088 A CN102445088 A CN 102445088A CN 2011104029170 A CN2011104029170 A CN 2011104029170A CN 201110402917 A CN201110402917 A CN 201110402917A CN 102445088 A CN102445088 A CN 102445088A
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- flue gas
- waste heat
- heat boiler
- backflow
- slagging scorification
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses a method and a device for inhibiting the slagging of a copper flash smelting waste heat boiler. An exhaust flow inlet is arranged at the upper par of a flue gas inlet of a tunnel type waste heat boiler and is close to the top of a radiation section, air flow with certain mass and speed is sprayed into the exhaust flow inlet, and thereby an air curtain is formed at the top of the radiation section of the waste heat boiler to prevent the high-temperature flue gas from directly flushing the top of the waste heat boiler so as to prevent slagging. Part of flue gas of the tail of the waste heat boiler is cyclically utilized, and smoke dust salinized wind and reflux flue gas are reasonably organized to form a layer of air curtain at the top of the waste heat boiler, so that the phenomenon that the air flow directly impacts the top of the radiation section is eliminated, thereby the slagging of the top of the waste heat boil is inhibited, the heat transfer efficiency is improved, and the safe operation of equipment is ensured.
Description
Technical field
The present invention relates to a kind of flash copper metallurgy waste heat boiler, particularly a kind ofly suppress the method and apparatus that flash copper metallurgy waste heat boiler coheres.
Background technology
Production scale is big, working condition good and the automatization level advantages of higher because of having in flash copper metallurgy, the extremely concern of China's copper industry and favor, and its production capacity constantly enlarges.Waste heat boiler is one of key equipment in the flash smelting technology; It not only reclaims the secondary energy sources of the high-temperature flue gas of discharging the smelting zone, reduces flue-gas temperature, and captures the part flue dust in the high-temperature flue gas; Reclaim precious metal; Reduce the dustiness of flue gas, guaranteeing the normal operation of process system, for afterbody gathers dust and acid-making process creates conditions
[1]
Flash copper metallurgy waste heat boiler is generally the tunnel type boiler, is made up of radiant section and two parts of convection section.Radiant section is designed to a big cooling space usually, not only makes flue gas be cooled to the adiabatic condensation temperature following (about 800 ℃) of melt granules, reclaims the high-temperature flue gas waste heat, and and most of particle can be settled down.At convection section, then utilize higher flue gas flow rate, carry out heat convection with convection bank, to reclaim the waste heat of lower temperature flue gas.
But waste heat boiler is in running, and there is tangible high temp jet in the radiant section top area, contains a large amount of metal oxides (like Cu
2O, PbO or ZnO) or the high temperature gas flow of sulfide flue dust directly impact the top water-cooling wall, temperature sharply reduces, and causes the flue dust of fusion in the flue gas or semi-molten state to cohere on tube wall, forms a large amount of glues (being slagging scorification) at the radiant section top.These glues will make the thermal resistance between water-cooling wall and the air-flow enlarge markedly on the one hand, reduce heat exchange efficiency, cause the exhanst gas outlet temperature to raise, the waste heat boiler undercapacity, and what influence was produced normally carries out; On the other hand, glue forms bulk, falls, and smashes equipment, causes personnel, device security accident when serious.
Preventing waste heat boiler water-cooling wall slagging scorification phenomenon at present, mainly is to rely on various ash removal equipment for flapping, but the working life that too fierce beaing will make waste heat boiler shortens.In order to make full use of the radiant section cooling space, there is the people to increase crust block pipe and radiation tube panel simultaneously at radiant section
[2], but because high temperature gas flow directly impacts crust block pipe and radiation tube panel, the slagging scorification phenomenon is even more serious; Also there is the people in height to be provided with convection section lower, prevents that air-flow from directly flowing along the furnace roof direction of radiant section than radiant section
[3], but, the flue dust settling amount of radiant section is significantly reduced owing to shortened the time of staying of air-flow at radiant section, to the heat transfer efficiency generation considerable influence of radiant section.Along with continually strengthening of flash smelting, flue gas and dustiness thereof significantly increase, and cause the interior slagging scorification phenomenon of waste heat boiler more and more serious, can not ensure normally carrying out of production.
[1] Tan Hejun. the flash stove waste heat boiler cold end corrosion analysis of causes and prevent measure [J]. nonferrous metallurgy design and research, 2009,30 (2): 10～12.
[2] Wang Gang, Lao Xuejing, moral is strong. and smeltery, Guixi flash stove waste heat boiler is transformed [J]. non-ferrous metal (smelting part), 2005, (1): 11～14.
[3]Bezuidenhout?J?J，Yang?Y，Eksteen?J?J.Computational?fluid?dynamic?modeling?of?a?waste-heat?boiler?associated?with?flash?smelting?of?base?metal?sulphides[J].The?Journal?of?The?Southern?African?Institute?of?Mining?and?Metallurgy，2008，108(3)，179-188.
Summary of the invention
First technical problem to be solved by this invention provides a kind of slagging scorification that suppresses the waste heat boiler top, improves heat transfer efficiency, the method for the inhibition flash copper metallurgy waste heat boiler slagging scorification of the safe operation of support equipment.
Second technical problem to be solved by this invention provides a kind of device of realizing suppressing flash copper metallurgy waste heat boiler slagging scorification method.
In order to solve above-mentioned first technical problem; The method of inhibition flash copper metallurgy waste heat boiler provided by the invention slagging scorification; On the top of tunnel type exhaust-heat boiler flue gas inlet and near the radiant section top one exhaust inflow entrance is set; Spray into the air-flow with certain mass and speed thus and form air curtain at the top of waste heat boiler radiant section, the top that stops high-temperature flue gas directly to wash away waste heat boiler produces slagging scorification.
The backflow flue gas of the air-flow of described air curtain before or after salt wind transmission and waste heat boiler economizer formed.
The volume of backflow flue gas that described air curtain is required and salt wind transmission total flow be exhaust gas volumn volume 10～20%, speed is 30～45m/s.
The salt wind transmission of described air curtain is injected waste heat boiler by different air flow inlets respectively with the backflow flue gas.
The extraction location of described backflow flue gas is looked the temperature of flue gas and is decided, and guarantees that when draw at described economizer rear portion the temperature maintenance of described backflow flue gas airduct is at SO
2More than the dew-point temperature of flue gas, otherwise described backflow flue gas needs to draw from described economizer front portion.
In order to solve above-mentioned second technical problem; Realization provided by the invention suppresses the device of the method for flash copper metallurgy waste heat boiler slagging scorification; Comprise uptake flue, radiant section and economizer; On the top of described uptake flue and near the tip position of described radiant section the air flow inlet of one group of salt wind transmission and backflow flue gas is set, described air flow inlet is made up of a plurality of salinization wind snouts and a plurality of backflow flue gas spout, and described salinization wind snout is connected with salt wind transmission input unit; Before or after described economizer, be connected with the backflow airduct, described backflow airduct is connected with described backflow flue gas spout through blower fan, valve.
Described salinization wind snout and described backflow flue gas spout are spaced.
Adopt the method and apparatus of the inhibition flash copper metallurgy waste heat boiler slagging scorification of technique scheme; On the top of tunnel type exhaust-heat boiler flue gas inlet and near the radiant section top one exhaust inflow entrance is set; Air curtain is formed on the top at the waste heat boiler radiant section; Stop high-temperature flue gas directly to wash away the top of waste heat boiler, produce slagging scorification.The partial fume that the air-flow of air curtain refluxes before or after salt wind transmission and waste heat boiler economizer is formed, and forms the jet-stream wind with certain mass and speed, thereby constitutes air curtain.In fact, metal oxide is converted into loosely organized sulfate in the flue dust in order to make, and be blown into little air (being the salt wind transmission) in the flue gas of being everlasting, but the salinization wind flow is too little, can not form air curtain, can't stop high-temperature flue gas washing away the waste heat boiler top; And increase the salinization wind flow, and will significantly increase exhaust gas volumn, therefore adopt the part circulating flue gas.The flue gas of required backflow and salt wind transmission total flow are 10～20% of exhaust gas volumn, and speed is 30～45m/s.For preventing the cold end corrosion of airflow pipeline, the salt wind transmission is injected waste heat boiler by different inlets respectively with the backflow flue gas, and injects after can not mixing again; The extraction location of backflow flue gas is looked the temperature of flue gas and is decided, and must guarantee that when draw at the economizer rear portion temperature maintenance of flue gas airduct is at SO
2More than the dew-point temperature of flue gas, otherwise the backflow flue gas needs to draw from the economizer front portion.
1), the present invention is suitable for the tunnel type waste heat boiler of existing flash copper metallurgy and other flash smeltings advantage of the present invention and good effect:; Only need the newly-increased cigarette system that returns; Change the entry position of salt wind transmission, all the other structures are constant, and system reform amount and investment cost are less.2), the method for the inhibition flash copper metallurgy waste heat boiler slagging scorification that proposes, form air curtain at the radiant section top with certain momentum, prevent that high-temperature flue gas from directly washing away the radiant section top and forming slagging scorification, the safe operation of support equipment.3), backflow flue gas and salt wind transmission introduce radiant section respectively, can effectively prevent the cold end corrosion on air delivery tube road.
In sum; The present invention is through recycle waste heat boiler partial fume, and rationalization's flue dust salt wind transmission and backflow flue gas form one deck air curtain at the waste heat boiler top; Eliminate the phenomenon at the direct impinging radiation section of air-flow top; Thereby suppress the slagging scorification at waste heat boiler top, improve heat transfer efficiency, the safe operation of support equipment.
Description of drawings
Fig. 1 is a system layout sketch map of the present invention.
Fig. 2 is that salt wind transmission and backflow smoke inlet are arranged sketch map.
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is described further.
The method of inhibition flash copper metallurgy waste heat boiler provided by the invention slagging scorification; On the top of tunnel type exhaust-heat boiler flue gas inlet and near the radiant section top one exhaust inflow entrance is set; Spray into air-flow thus and form air curtain at the top of waste heat boiler radiant section with certain mass and speed; The top that stops high-temperature flue gas directly to wash away waste heat boiler produces slagging scorification; The backflow flue gas of the air-flow of air curtain before or after salt wind transmission and waste heat boiler economizer formed, the volume of backflow flue gas that air curtain is required and salt wind transmission total flow be exhaust gas volumn volume 10～20%, speed is 30～45m/s.The salt wind transmission of air curtain is injected waste heat boiler by different air flow inlets respectively with the backflow flue gas.
The extraction location of backflow flue gas is looked the temperature of flue gas and is decided, and guarantees that when draw at described economizer rear portion the temperature maintenance of described backflow flue gas airduct is at SO
2More than the dew-point temperature of flue gas, otherwise described backflow flue gas needs to draw from described economizer front portion.
Referring to Fig. 1 and Fig. 2; Flash copper metallurgy waste heat boiler is the tunnel type boiler; Comprise radiant section 2, crust block pipe 3, convection bank 4 and economizer 5; The air flow inlet 9 (size of the number visual device of air flow inlet is suitably adjusted) of one group of salt wind transmission and backflow flue gas is set on the top of uptake flue 1 and near the tip position of radiant section 2; Air flow inlet is made up of the first salinization wind snout 91, the second salinization wind snout 93, the 3rd salinization wind snout 94 and the first backflow flue gas spout 92, the second backflow flue gas spout 94, the 3rd backflow flue gas spout 96; Be spaced by the first salinization wind snout 91, the first backflow flue gas spout 92, the second salinization wind snout 93, the second backflow flue gas spout 94, the 3rd salinization wind snout 94 and the 3rd backflow flue gas spout 96; The first salinization wind snout 91, the second salinization wind snout 93 are connected with salt wind transmission input unit with the 3rd salinization wind snout 94; Behind economizer 5, be connected with backflow airduct 6; Backflow airduct 6 is connected with the 3rd backflow flue gas spout 96 compositions with the first backflow flue gas spout 92, the second backflow flue gas spout 94 through blower fans 8, valve 7, and the extraction location of backflow flue gas is looked the temperature of flue gas and decided, and the temperature maintenance of flue gas backflow airduct 6 of when draw at the economizer rear portion, guaranteeing to reflux is at SO
2More than the dew-point temperature of flue gas, otherwise the backflow flue gas of backflow airduct 6 needs to draw from economizer 5 front portions.
Existing is 50000Nm with the exhaust gas volumn
3The flash copper metallurgy waste heat boiler of/h is that example is explained.50000Nm
3The flue gas of/h gets into radiant section 2 by uptake flue 1, passes through crust block pipe 3, convection bank 4 and economizer 5 again, delivers to the purification acid making system.
When adopting patent art that existing flash copper metallurgy afterheat boiler system is implemented to transform; Factory building layout, furnace binding and smoke evacuation system etc. all can remain unchanged; The air flow inlet 9 of one group of salt wind transmission and backflow flue gas is set on the top of flue 1 and near the tip position of radiant section 2; By 6 spouts promptly the first salinization wind snout 91, the second salinization wind snout 93, the 3rd salinization wind snout 94 and the first backflow flue gas spout 92, the second backflow flue gas spout 94, the 3rd backflow flue gas spout 96 form, be spaced by the first salinization wind snout 91, the first backflow flue gas spout 92, the second salinization wind snout 93, the second backflow flue gas spout 94, the 3rd salinization wind snout 94 and the 3rd backflow flue gas spout 96; Simultaneously; At economizer 5 back backflow partial fumes (temperature is about 260 ℃); Be delivered to the first backflow flue gas spout 92, the second backflow flue gas spout 94 and the 3rd backflow flue gas spout 96 through backflow airduct 6 through blower fans 8, the big I of backflow flue gas is regulated by valve 7; Salt wind transmission and backflow flue gas are injected with the speed of 30～45m/s, guaranteeing the forming air curtain with certain momentum at radiant section 2 tops, thereby stop high temperature gas flow to directly the washing away of waste heat boiler top, and suppress the generation of slagging scorification phenomenon.
Transform back main technologic parameters scope: salinization air quantity, backflow exhaust gas volumn are 10% of exhaust gas volumn, and jet velocity is 30～45m/s.
Claims (7)
1. method that suppresses the slagging scorification of flash copper metallurgy waste heat boiler; It is characterized in that: one exhaust inflow entrance is set on the top of tunnel type exhaust-heat boiler flue gas inlet and near the radiant section top; Spray into air-flow thus with certain mass and speed; Thereby air curtain is formed on the top at the waste heat boiler radiant section, and the top that stops high-temperature flue gas directly to wash away waste heat boiler produces slagging scorification.
2. the method for inhibition flash copper metallurgy waste heat boiler according to claim 1 slagging scorification is characterized in that: the backflow flue gas of the air-flow of described air curtain before or after salt wind transmission and waste heat boiler economizer formed.
3. the method for inhibition flash copper metallurgy waste heat boiler according to claim 2 slagging scorification is characterized in that: the volume of backflow flue gas that described air curtain is required and salt wind transmission total flow be exhaust gas volumn volume 10～20%, speed is 30～45m/s.
4. according to the method for claim 2 or 3 described inhibition flash copper metallurgy waste heat boiler slagging scorification, it is characterized in that: the salt wind transmission of described air curtain is injected waste heat boiler by different air flow inlets respectively with the backflow flue gas.
5. according to the method for claim 2 or 3 described inhibition flash copper metallurgy waste heat boiler slagging scorification; It is characterized in that: the extraction location of described backflow flue gas is looked the temperature of flue gas and is decided; When draw at described economizer rear portion, guarantee the temperature maintenance of described backflow flue gas airduct more than the dew-point temperature of SO2 flue gas, otherwise described backflow flue gas needs to draw from described economizer front portion.
6. realize the device of the method for the described inhibition flash of claim 1 copper metallurgy waste heat boiler slagging scorification; Comprise uptake flue (1), radiant section (2) and economizer (5); It is characterized in that: the air flow inlet (9) that one group of salt wind transmission and backflow flue gas are set on the top of described uptake flue (1) and near the tip position of described radiant section (2); Described air flow inlet is made up of a plurality of salinization wind snouts and a plurality of backflow flue gas spout; Described salinization wind snout is connected with salt wind transmission input unit, before or after described economizer (5), is connected with backflow airduct (6), and described backflow airduct (6) is connected with described backflow flue gas spout through blower fan (8), valve (7).
7. realization according to claim 6 suppresses the device of the method for flash copper metallurgy waste heat boiler slagging scorification, and it is characterized in that: described salinization wind snout and described backflow flue gas spout are spaced.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011104029170A CN102445088A (en) | 2011-12-07 | 2011-12-07 | Method and device for inhibiting slagging of copper flash smelting waste heat boiler |
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| CN2011104029170A CN102445088A (en) | 2011-12-07 | 2011-12-07 | Method and device for inhibiting slagging of copper flash smelting waste heat boiler |
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| CN2011104029170A Pending CN102445088A (en) | 2011-12-07 | 2011-12-07 | Method and device for inhibiting slagging of copper flash smelting waste heat boiler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197353A (en) * | 2014-09-18 | 2014-12-10 | 成都市蜀科科技有限责任公司 | Method for preventing flue from being scalded when water mist is sprayed on flue |
| CN108562462A (en) * | 2018-03-26 | 2018-09-21 | 中南大学 | A kind of sampler for extracting flue dust in high-temperature flue gas |
| CN111363930A (en) * | 2020-04-15 | 2020-07-03 | 云南锡业股份有限公司铜业分公司 | Method for quickly melting furnace accretion of top-blown furnace |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197353A (en) * | 2014-09-18 | 2014-12-10 | 成都市蜀科科技有限责任公司 | Method for preventing flue from being scalded when water mist is sprayed on flue |
| CN108562462A (en) * | 2018-03-26 | 2018-09-21 | 中南大学 | A kind of sampler for extracting flue dust in high-temperature flue gas |
| CN108562462B (en) * | 2018-03-26 | 2024-03-29 | 中南大学 | Sampling device for extracting smoke dust from high-temperature smoke |
| CN111363930A (en) * | 2020-04-15 | 2020-07-03 | 云南锡业股份有限公司铜业分公司 | Method for quickly melting furnace accretion of top-blown furnace |
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