CN102179151A - Alkali liquor wet purification technology for aluminum melting furnace smoke - Google Patents
Alkali liquor wet purification technology for aluminum melting furnace smoke Download PDFInfo
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- CN102179151A CN102179151A CN2011100802884A CN201110080288A CN102179151A CN 102179151 A CN102179151 A CN 102179151A CN 2011100802884 A CN2011100802884 A CN 2011100802884A CN 201110080288 A CN201110080288 A CN 201110080288A CN 102179151 A CN102179151 A CN 102179151A
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Abstract
The invention discloses an alkali liquor wet purification technology for aluminum melting furnace smoke. An aluminum melting furnace smoke pipe, a cooler, a spray tower, a fan and a chimney are connected through a pipeline; smoke conveyed by the aluminum melting furnace smoke pipe enters the spray tower through the cooler; the spray tower is communicated with the chimney through the negative pressure fan; a water tower and a water treatment system are arranged; the water treatment system consists of an acid pump, a dosing machine, a clear water reservoir, a neutralization tank and a drying bed; clear water pumps are arranged on the neutralization tank and between the clear water reservoir and the spray tower; a sewage pump is arranged between the neutralization tank and the drying bed; the clear water reservoir is communicated with the spray tower through the clear water pump; and the water tower is communicated with the cooler and the clear water reservoir. Compared with the conventional smoke purification technology, the alkali liquor wet technology purifies the smoke generated by the aluminum melting furnace, and can well absorb, neutralize and calcify hydrogen chloride Hel, sulfur dioxide SO2 and nitric oxides in the smoke.
Description
Technical field
The present invention relates to a kind of flue gases purification, relate in particular to a kind of aluminium melting furnace flue gas alkali lye wet cleaning technology.
Background technology
At present, the design of aluminium melting furnace flue gas purification system mainly adopt gas tank formula pulsed jet cloth filter process for purifying, yet sack cleaner according to smoke property, is selected the filter pocket material that is suitable for application conditions to the requirement height of filter bag both at home and abroad.Usually, be lower than 120 ℃, require filter pocket material to have under the situation of acid resistance and durability, often select polyester flannel and terylene Nomex for use in flue-gas temperature; When handling high-temperature flue gas＜250 ℃, mainly select the graphitization glass wool cloth for use; At some in particular cases, select carbon fiber bar filter pocket material etc. for use.And the flue-gas temperature that aluminium melting furnace produces outlet reaches about 400 ℃, and generation contains (SO
2), nitrogen oxide, HCL and a spot of CL
2Deng sour gas, because the temperature height runs into the easy dewfall of airborne steam in cooling procedure, particularly in high-temperature flue gas, contain SO usually
2, acid dew point is higher during HCL, mostly, 170 ℃-180 ℃, if be lower than this temperature, acid solution coagulates, dust coheres, and stops up filtrate.
Though there is indivedual environmental protection producer to solve the partial properties such as antistatic property, erosion performance, chemistry-resistant characteristic, mechanical property, firing resistance of filter bag abroad, but up to the present, also do not have a kind of desirable filtrate can satisfy all above-mentioned all properties requirements, so the flue gas that aluminium melting furnace produces is difficult during present gas cleaning an is handled engineering.Particularly work as flue-gas temperature and be reduced to below the flue gas dew point temperature, when pipeline or equipment inwall dewfall, corrosivity is stronger.Inwall, cooling device rust corrosion to pipeline, valve, deduster are serious, and inner surface forms the iron oxide of squamous, wears and come off gradually and become rusty.Because of dust contains aluminium compound (AL
2O
3) wait dust to stop up filter bag easily, will influence stable, system's dewfall of furnace pressure and cause stick with paste bag, temperature is too high and cause the flow that burns bag and reduce flue gas.Contain a large amount of CL in the flue gas
2, HCL, pernicious gases such as HF work the mischief to employee's health, and produce a large amount of sour gas corrosion factory building and equipment, cause a large amount of plant equipment corrosions, and a large amount of electrical equipments is malfunctioning, damage, and the factory building of steel construction has been caused potential safety hazard.Though sack cleaner is up to standard fully to the dusty gas green technology, to sour corrosion gas can't purified treatment to the index of environment protection standard.
Summary of the invention
Purpose of the present invention just is that providing a kind of addresses the above problem, dust removal performance is good, can be to the Hel hydrogen chloride in the flue gas, SO2 sulfur dioxide, the good absorption of nitrogen oxide, neutralization, calcification, internals is less scaling, the aluminium melting furnace flue gas alkali lye wet cleaning technology of obstruction.
To achieve these goals, the technical solution used in the present invention is: a kind of aluminium melting furnace flue gas alkali lye wet cleaning technology, comprise the aluminium furnace fume pipe, cooler, spray column, blower fan and the chimney that connect by pipeline, the flue gas that described aluminium furnace fume pipe is carried enters spray column by cooler, and described spray column is communicated with chimney by negative pressure operation blower fan;
Also comprise water tower and water treatment system, described water treatment system is made up of acid pump, chemicals feeder, clear water reserviors, neutralization pond and mummifying pool, described spray column is communicated with neutralization pond by acid pump, described chemicals feeder is communicated with neutralization pond, all be provided with clarified water pump on the described neutralization pond and between clear water reserviors and the spray column, be provided with sewage pump between described neutralization pond and the mummifying pool, described clear water reserviors are communicated with spray column by clarified water pump, and described water tower is communicated with cooler and clear water reserviors.
As preferably: described spray column is the pellet type spray column, adopt reinforcing bar to mix clay structure, inner surface adopts resistant to elevated temperatures glass resin flake, the interior alloy nozzle of installing, spray cover ratio 1.2, described spray column overhead guard and internals adopt stainless steel material to make, and airduct, soft connection place scribble high-temperature anticorrosion paint, and described spray column inside is provided with demister.
As preferably: described cooler adopts double-skin duct, and inwall is brushed with antirust paint.
As preferably: described blower fan adopts VFC, and fan blade adopts the material of acid resistance material to make.
As preferably: described clarified water pump and sewage pump adopt the corrosion-resistant water pump of stainless steel.
Compared with prior art, the invention has the advantages that: the invention solves this stubborn problem of environmental protection aspect, the flue gas that adopts alkali lye Wet technique purified treatment aluminium melting furnace to produce, flue gas, flue dust enter spray column, after the spray area of coverage was through washing, flue gas, flue dust obtained strong purification, and the Hel hydrogen chloride in the flue gas, SO2 sulfur dioxide, nitrogen oxide all have very high solubility in water, therefore, but through spray column flue gas after being purified qualified discharge.The spray column internals does not exist fouling, blockage problem, and because of absorption liquid is a water, but this recirculated water is along with the continuity of time, acid can the increasing, and handle in when " PH " subordinate to 5.5～4.5 absorption liquid being got to and calcification pond, can not pollute to external world.
Description of drawings
Fig. 1 is a structural representation of the present invention.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing.
Embodiment: referring to Fig. 1, a kind of aluminium melting furnace flue gas alkali lye wet cleaning technology, comprise the aluminium furnace fume pipe that connects by pipeline, cooler, spray column, blower fan and chimney, described cooler adopts double-skin duct, inwall is brushed with antirust paint, described blower fan adopts VFC, fan blade adopts the material of acid resistance material to make, the flue gas that described aluminium furnace fume pipe is carried enters spray column by cooler, described spray column is communicated with chimney by negative pressure operation blower fan, and described spray column is the pellet type spray column, adopts reinforcing bar to mix clay structure, inner surface adopts resistant to elevated temperatures glass resin flake, the interior alloy nozzle of installing, spray cover ratio 1.2, described spray column overhead guard and internals adopt stainless steel material to make, airduct, soft connection place scribbles high-temperature anticorrosion paint, and described spray column inside is provided with demister;
Also comprise water tower and water treatment system, described water treatment system is made up of acid pump, chemicals feeder, clear water reserviors, neutralization pond and mummifying pool, described spray column is communicated with neutralization pond by acid pump, described chemicals feeder is communicated with neutralization pond, all be provided with clarified water pump on the described neutralization pond and between clear water reserviors and the spray column, be provided with sewage pump between described neutralization pond and the mummifying pool, described clear water reserviors are communicated with spray column by clarified water pump, described water tower is communicated with cooler and clear water reserviors, and described clarified water pump and sewage pump adopt the corrosion-resistant water pump of stainless steel.
Workflow is as follows: flue gas enters spray column through cooler, and the spray column top installs high-pressure nozzle additional, the alkali lye (NaHCO that the inside ejection prepares
3Or CaHCO
3), under compressed-air actuated effect, atomize, the ratio resistance of flue gas, the purpose of removing sour gas had both been reduced, reached the purpose of flue gas cool-down again, flue gas enters spray column inside from the pallet of spray column bottom, pallet makes flue gas stream uniform, flue gas, flue dust produce fierce contact at the reverse spray liquid of the Kong Zhongyu of pallet, make the acid gas in the flue gas be dissolved absorption for the first time, flue dust also obtains effectively first washing, make flue-gas temperature can drop to 160～180 ℃, flue gas, flue dust enter the spray uptake zone then, the HCL in flue dust, the flue gas, HF, SO
2Very high solubility is all arranged in water, neutralize with the weak base of ejection, flue dust is also effectively washed in powerful water smoke, after height spray footprint is through washing, through not only moisture saturated a large amount of water smokes and the acid mist of also carrying of gas that purifies, this gas go out before the tower also must through twice strictness take off the mist program, with the moisture 100mg/m that drops to of gas
3About, gas temperature drops to 47～55 ℃, therefore but process spray column flue gas after being purified is with regard to qualified discharge, flue gas in spray column after cooling, humidification and purification, if directly enter atmosphere, not only Yin Wendu is lower than dew point and flue gas sinks to having burn into and heating power lifting to weaken to the surrounding buildings thing to cause ground pollution, and generation " white cigarette ", set up reheater (being steam-heated pipe line), temperature is elevated to 77～82 ℃, like this running of blower fan also is of great benefit to, the purification flue gas after the heating is sent into chimney by air-introduced machine and is discharged.
Because of absorption liquid is a water, but this recirculated water is along with the continuity of time in the water treatment system, and acid can the increasing needs that absorption liquid is got to neutralization pond by acid pump and handle when ' PH ' subordinate to 5.5～4.5, and neutralization pond is provided with need interpolation NaHCO
3Or CaHCO
3The charger of alkalescence neutralization materials, neutralizing for a long time in the neutralization pond produces precipitation, flows to mummifying pool by the sewage pump that disposes and carries out the blowdown precipitation, and clear water reserviors also are moisturizing pond or water cooling pond, be used for the molten bath that moisturizing is used, described water tower provides big water gaging for cooler and clear water reserviors.
Described spray column is the pellet type spray column, adopt reinforcing bar to mix clay structure, inner surface adopts resistant to elevated temperatures glass resin flake, described spray column overhead guard and internals adopt stainless steel material to make, airduct, soft connection place scribble high-temperature anticorrosion paint, described spray column inside is provided with demister, described cooler adopts double-skin duct, inwall is brushed with antirust paint, the fan blade of described blower fan adopts the material of acid resistance material to make, described clarified water pump and sewage pump adopt the corrosion-resistant water pump of stainless steel, and making the internal system member is not have fouling, blockage problem.
Claims (5)
1. aluminium melting furnace flue gas alkali lye wet cleaning technology, it is characterized in that: comprise the aluminium furnace fume pipe, cooler, spray column, blower fan and the chimney that connect by pipeline, the flue gas that described aluminium furnace fume pipe is carried enters spray column by cooler, and described spray column is communicated with chimney by negative pressure operation blower fan;
Also comprise water tower and water treatment system, described water treatment system is made up of acid pump, chemicals feeder, clear water reserviors, neutralization pond and mummifying pool, described spray column is communicated with neutralization pond by acid pump, described chemicals feeder is communicated with neutralization pond, all be provided with clarified water pump on the described neutralization pond and between clear water reserviors and the spray column, be provided with sewage pump between described neutralization pond and the mummifying pool, described clear water reserviors are communicated with spray column by clarified water pump, and described water tower is communicated with cooler and clear water reserviors.
2. according to the described a kind of aluminium melting furnace flue gas alkali lye wet cleaning technology of claim 1, it is characterized in that: described spray column is the pellet type spray column, adopt reinforcing bar to mix clay structure, inner surface adopts resistant to elevated temperatures glass resin flake, the interior alloy nozzle of installing, spray cover ratio 1.2, described spray column overhead guard and internals adopt stainless steel material to make, airduct, soft connection place scribble high-temperature anticorrosion paint, and described spray column inside is provided with demister.
3. according to the described a kind of aluminium melting furnace flue gas alkali lye wet cleaning technology of claim 1, it is characterized in that: described cooler adopts double-skin duct, and inwall is brushed with antirust paint.
4. according to the described a kind of aluminium melting furnace flue gas alkali lye wet cleaning technology of claim 1, it is characterized in that: described blower fan adopts VFC, and fan blade adopts the material of acid resistance material to make.
5. according to the described a kind of aluminium melting furnace flue gas alkali lye wet cleaning technology of claim 1, it is characterized in that: described clarified water pump and sewage pump adopt the corrosion-resistant water pump of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100802884A CN102179151A (en) | 2011-03-31 | 2011-03-31 | Alkali liquor wet purification technology for aluminum melting furnace smoke |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100802884A CN102179151A (en) | 2011-03-31 | 2011-03-31 | Alkali liquor wet purification technology for aluminum melting furnace smoke |
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|---|---|
| CN102179151A true CN102179151A (en) | 2011-09-14 |
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| CN2011100802884A Pending CN102179151A (en) | 2011-03-31 | 2011-03-31 | Alkali liquor wet purification technology for aluminum melting furnace smoke |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197727A (en) * | 2014-08-13 | 2014-12-10 | 湖州宏鑫铝业有限公司 | System and method for treating tail gas of aluminum smelting furnace |
| CN104364002A (en) * | 2011-11-21 | 2015-02-18 | 氟石科技公司 | Prevention of nitro-amine formation in carbon dioxide absorption processes |
| CN109999642A (en) * | 2019-04-28 | 2019-07-12 | 李金奇 | A kind of efficiency of waste gas processing equipment |
| CN115140860A (en) * | 2021-03-31 | 2022-10-04 | 国家电投集团黄河上游水电开发有限责任公司 | Acid water treatment device of green anode roasting flue gas purification spray tower and use method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056161A (en) * | 1991-05-15 | 1991-11-13 | 长沙汽车电器厂 | Smoke elimination and dust removing method of aluminium smelting furnace and equipment thereof |
| WO2008087769A1 (en) * | 2007-01-17 | 2008-07-24 | Babcock-Hitachi Kabushiki Kaisha | Wet flue-gas desulfurization equipment |
| CN201192614Y (en) * | 2008-05-20 | 2009-02-11 | 天津大学 | Wet cleaning apparatus of flue gas |
| CN101486517A (en) * | 2009-02-17 | 2009-07-22 | 南通京源水工自动化设备有限公司 | Treatment process for desulfurized wastewater |
| CN201419077Y (en) * | 2008-10-09 | 2010-03-10 | 山西晋丰环保工程设计有限公司 | Separation-type sodium-calcium double alkali method smoke gas desulfurizing device |
-
2011
- 2011-03-31 CN CN2011100802884A patent/CN102179151A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056161A (en) * | 1991-05-15 | 1991-11-13 | 长沙汽车电器厂 | Smoke elimination and dust removing method of aluminium smelting furnace and equipment thereof |
| WO2008087769A1 (en) * | 2007-01-17 | 2008-07-24 | Babcock-Hitachi Kabushiki Kaisha | Wet flue-gas desulfurization equipment |
| CN201192614Y (en) * | 2008-05-20 | 2009-02-11 | 天津大学 | Wet cleaning apparatus of flue gas |
| CN201419077Y (en) * | 2008-10-09 | 2010-03-10 | 山西晋丰环保工程设计有限公司 | Separation-type sodium-calcium double alkali method smoke gas desulfurizing device |
| CN101486517A (en) * | 2009-02-17 | 2009-07-22 | 南通京源水工自动化设备有限公司 | Treatment process for desulfurized wastewater |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104364002A (en) * | 2011-11-21 | 2015-02-18 | 氟石科技公司 | Prevention of nitro-amine formation in carbon dioxide absorption processes |
| CN104197727A (en) * | 2014-08-13 | 2014-12-10 | 湖州宏鑫铝业有限公司 | System and method for treating tail gas of aluminum smelting furnace |
| CN109999642A (en) * | 2019-04-28 | 2019-07-12 | 李金奇 | A kind of efficiency of waste gas processing equipment |
| CN115140860A (en) * | 2021-03-31 | 2022-10-04 | 国家电投集团黄河上游水电开发有限责任公司 | Acid water treatment device of green anode roasting flue gas purification spray tower and use method |
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Application publication date: 20110914 |