CN100563783C - A kind of bitumen flue gas purifying method - Google Patents

A kind of bitumen flue gas purifying method Download PDF

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Publication number
CN100563783C
CN100563783C CNB200610046475XA CN200610046475A CN100563783C CN 100563783 C CN100563783 C CN 100563783C CN B200610046475X A CNB200610046475X A CN B200610046475XA CN 200610046475 A CN200610046475 A CN 200610046475A CN 100563783 C CN100563783 C CN 100563783C
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flue gas
gas
solid
bitumen
bitumen flue
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CNB200610046475XA
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CN101062458A (en
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马绍先
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Northeast University Design and Research Institute Co Ltd
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Northeast University Design and Research Institute Co Ltd
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Abstract

A kind of bitumen flue gas purifying method is transported to the cleaning system inlet with bitumen flue gas through pipeline, purifies by gas-solid reaction, burning, each operation of dedusting, it is characterized in that: (1) employing alumina powder is made solid absorbent bitumen flue gas is fully adsorbed; (2) carry out gas solid separation, bitumeniferous adsorbent is separated with flue gas after being purified; (3) adsorbent after will separating burns; (4) with the flue gas after the gas solid separation with burn after flue gas spray and cool and dedusting; (5) by the flue gas after the by-pass valve control detection cooling dedusting, up to standard then by smoke stack emission; The below standard system entry circularly purifying of then sending into.The present invention also provides a kind of apparatus system of implementing said method, it is characterized in that gas solid reactor is made of the Venturi tube or the adsorbent bed of filling alumina powder.Purification efficiency of the present invention is than existing technology height, and its solid absorbent can be recycled and the raw material of finally making electrolytic aluminium is handled non-secondary pollution.Except waste gas discharge up to standard was arranged, no waste residue, waste water were discharged, and can obtain good benefit.

Description

A kind of bitumen flue gas purifying method
Technical field
The invention belongs to the method that reclaims, purifies cigarette and waste gas with fixing adsorbent, promptly relate to a kind of improvement method of making aluminium-electrolyzing pre-roaster with the bitumen flue gas that distributes in the carbon product process.
Background technology
Bitumen flue gas is the environomental pollution source of modern aluminum with a maximum in the carbon element factory.In the anode production process of aluminium-electrolyzing pre-roaster, particularly in the preparatory process of anode paste, many equipment all can send a large amount of bitumen flue gas.Containing the fragrant hydrocarbon (PAH) of tar and many cyclophanes in the bitumen flue gas, is very harmful material, and it can seriously jeopardize the quality of operation area (workshop), plant area and plant area's surrounding enviroment.Flue gas just allows to be discharged in the atmosphere after need reaching waste gas emission standard through purification.At present, domestic general large-scale carbon element factory introduces dry method and wet cleaning technology and equipment more, and the processing of its sewage of wet method pitch purification techniques is comparatively complicated; Dry cleaning technology multipurpose carbon powder adsorptive pitch flue gas, its shortcoming is: (1) tar and dust form vicious circle in the goods process; (2), can have influence on the quality of product again owing to the utilization again of carbon dust.
Chinese patent 02155281.9 discloses " a kind of method and apparatus of filtering bitumen flue gas ", and it adopts bulky grain to forge Jiaozhuo, back adsorbent, and bitumen flue gas is carried out filtering by the fixed adsorption bed of being made up of Jiao after oarse-grained the forging.Chinese patent 03153135.0 discloses " a kind of renovation process of filtering bitumen flue gas medium ", its processing procedure is to be that 300-600 ℃, pressure are the thermal current of 0.5-3MPa and the glance coal air-flow is reverse is blown in the absorption filtration device that carries out glance coal with temperature, thermal current passes bulky grain and forges the burnt filtering medium layer in back, the flowability of the condensate of the bitumen flue gas volatilization that is adsorbed on filtering medium layer is improved, and under gas shock, separate with adsorbing medium, and make adsorbing medium regeneration.
Summary of the invention
The present invention is different from above-mentioned existing asphalt smoke gas purifying technology, proposed a kind of adopt solid absorbent by gas-solid reaction absorption, carry out gas solid separation again, solid burns the dry cleaning method of handling bitumen flue gas, the bitumen flue gas that discharged of spontaneous anode plant and asphalt melting workshop section merges in the cleaning system and carries out integrated treatment in the future.
Bitumen flue gas purifying method of the present invention is transported to the cleaning system inlet with bitumen flue gas through pipeline, purifies by gas-solid reaction, burning, each operation of dedusting, it is characterized in that:
(1) advanced promoting the circulation of qi is reacted admittedly, with solid absorbent bitumen flue gas is fully adsorbed;
(2) carry out gas solid separation again, make gas-solid reaction after bitumeniferous adsorbent separate with flue gas after being purified;
(3) flue gas after the gas solid separation is carried out the sedimentation dust removal process;
(4) bitumeniferous adsorbent after the gas-solid reaction is fully burned with air blast and fuel under Controlled by Programmable Controller;
(5) flue gas after will burning spray cooling with lower the temperature, dedusting;
(6) detect flue gas after cooling, the dedusting by by-pass valve control, up to standardly then directly discharge by chimney; Below standardly then send into gas-solid reaction operation circulation again and repeatedly purify.
The solid absorbent that is adopted in the bitumen flue gas purifying method of the present invention is an alumina powder.In the adding gas solid reactor mainly is the fresh aluminum oxide powder, also can add the cyclic oxidation aluminium powder that a part of adsorptive pitch flue gas cooled off with whirlwind after burning.
The invention allows for a kind of asphalt smoke purifying system of implementing above-mentioned bitumen flue gas purifying method, comprise gas solid reactor, gas-solid separator, incinerator, it is characterized in that:
(1) gas solid reactor adopts venturi (Venturi) reactor or adsorbent bed to constitute;
(2) gas-solid separator is the sack cleaner of sandwich construction;
(3) incinerator adopts natural gas or heavy oil to make fuel, controls combustion process with air blast;
(4) be provided with cooling cyclone and spray cooler in addition.
Asphalt smoke purifying system of the present invention adopts Programmable Logic Controller (PLC) control automatically, and what adopt PLC control mainly is following two systems:
(1) autocombustion system of incinerator.It mainly regulates the straying quatity of natural gas and heavy oil automatically according to the change at random of bitumen flue gas temperature;
(2) the vavle shelf system of spray cooler.It is mainly according to temperature and the hydraulic pressure that flow tracking is regulated water system automatically and the atmospheric pressure that atomized water is used of the flue gas after handling.
The implementation process of bitumen flue gas purifying method of the present invention is as follows: earlier in the future the bitumen flue gas that produced of spontaneous anode plant and asphalt melting workshop section is transported to the inlet of cleaning system through piping, and its temperature is 90 ± 5 ℃ usually.At first enter gas solid reactor, add the alumina powder that the fresh aluminum oxide powder is arranged and be circulated throughout in the reactor, fully contact, react with alumina powder at reactor medium pitch flue gas, the oxidized aluminium powder of pitch droplet is fully adsorbed, will import further that hot flue gas and its is the entrained alumina powder of gas-solid separator by the flue gas of alumina powder then and separate; Alumina powder after the separation is admitted to incinerator together with the alumina powder in the reactor of adsorptive pitch and burns, and the flue gas after the clean separation will be delivered directly to by-pass valve control, and the micronic dust after the sedimentation also is admitted to incinerator through the sedimentation dust arrester.Flue gas after the burning enters spray cooler, and cooling and further dedusting are admitted in the gas solid reactor again then.Flue gas can reach national environmental standard usually fully, passes through smoke stack emission in atmosphere by by-pass valve control; If do not reach national environmental standard yet then by-pass valve control makes it enter gas solid reactor automatically, carry out purified treatment with the bitumen flue gas of not handled that newly enters gas solid reactor.
Alumina powder after the burning is then sent into cyclic oxidation aluminium basin through after the cooling cyclone cooling, and wherein a part will add in proportion with the fresh aluminum oxide powder and make adsorbent in the gas solid reactor and use, and major part is delivered to aluminium electrolysis shop and made the raw material of electrolytic aluminium and use.
Gas solid reactor of the present invention can be a Venturi tube, also can be adsorbent bed.Filling is alumina powder in Venturi tube; Adsorbent bed then should adopt activated alumina.Gas-solid separator can be adopted the sack cleaner of sandwich construction.
Spray cooler that the present invention adopts is a vertical structure, and its nozzle has good sprayability, and the pressure when adopting compressed air and regulating atomizing with PLC, so cooling water is evaporated fully, the system of assurance does not have the sewage venting.
Core technology feature of the present invention is to adopt alumina powder to make adsorbent, utilizes the ingenious combination of various parts, thereby forms a new bitumen flue gas purifying method and a cleaning system with remarkable technological progress.
Next bitumen flue gas purifying method proposed by the invention and its purification efficiency of cleaning system are all high than other process for purifying and system, and after pitch was burned, solid absorbent can be recycled, and finally can be used as the raw material processing of electrolytic aluminium, so non-secondary pollution.Native system finally reaches the waste gas of national environmental standard except that discharging through purified treatment, and no waste residue and waste water are discharged.So after applying, be expected to obtain remarkable social benefit and economic benefit.
Description of drawings
Fig. 1 is the principle of bitumen flue gas purifying method of the present invention, the established technology FB(flow block).
Fig. 2 is for implementing the device schematic diagram of the designed asphalt smoke purifying system of bitumen flue gas purifying method of the present invention; Wherein: 1 is gas solid reactor, and 2 is gas-solid separator, and 3 is incinerator, 4 is cooling cyclone, and 5 is spray cooler, and 6 is deduster, 7 is centrifugal blower, and 8 is cooler, and 9 is roots blower, 10 is large centrifugal fan, and 11 is valve, and 12 is the PLC control system, 13 is the fresh adsorbent basin, 14 are circulation adsorbent basin, and 15 is auxillary flue, and 16 is chimney.
The specific embodiment
Below in conjunction with Figure of description by specific embodiment to bitumen flue gas purifying method of the present invention and cleaning system in addition further instruction with replenish.
The technological process of bitumen flue gas purifying method of the present invention as shown in Figure 1.Technology specific implementation process of the present invention is a spontaneous anode flue gas and send in the gas solid reactor from the asphalt melting flue gas in the future, by solid absorbent bitumen flue gas is fully adsorbed.Gas solid reactor can be the venturi reactor, also can be adsorbent bed, and solid absorbent is an alumina powder.Bitumen flue gas just enters gas-solid separator and carries out gas solid separation through after the gas-solid reaction, and the purification flue gas after the separation is again through the sedimentation dedusting, and just not bituminous and adsorbent micro mist can be arranged to by-pass valve control.On the other hand, solid absorbent after the separation and the micro mist that settles down are admitted to incinerator together and burn, and the flue gas after the burning is drawn towards the gas solid reactor circularly purifying after entering the spray cooling.And the solid absorbent after burning, because having purified, it can be admitted to circulation adsorbent basin by the whirlwind cooling, and will be in proportion add together with fresh adsorbent and be utilized once more in the gas solid reactor, the raw material that unnecessary circulation adsorbent can be used as aluminium cell uses.After the flue gas after being purified process sedimentation dedusting, when leading to by-pass valve control, valve can detect automatically to the composition of flue gas, meeting state environmental emissioning standard is then directly discharged by chimney, fail to reach national environmental standard, then will send into gas solid reactor again and carry out purified treatment together again with bitumen flue gas.
Embodiment 1
Layout according to Fig. 2 is joined by valve Venturi tube 1 with green anode workshop smoke evacuation house steward with from the smoke evacuation house steward of two sections of asphalt meltings.The end of Venturi tube is connected to gas-solid separator 2 inlets, and gas-solid separator top is connected to deduster 6, and gas-solid separator is the sack cleaner of sandwich construction, and its lower end is connected to incinerator 3, and incinerator is controlled its combustion process by centrifugal blower 7 air blast.Through cooling cyclone 5 coolings, its dust mainly is a solid absorbent, will be admitted in the circulation adsorbent basin 14 by pipeline and roots blower 9 earlier for the flue gas of incinerator and dust.Cool off once more and flue gas enters spray cooler 5 from cooler top, and send into the Venturi tube front end again.The solid absorbent of being filled in the Venturi tube is by fresh solid absorbent basin 13 and the supply of solid circle adsorbent basin, baiting valve is all arranged below these two basins, and is connected with Venturi tube with pipeline.This system is provided with PLC control system 12, the keying of the combustion system of its major control incinerator, the hydraulic pressure system of spray cooler and big centrifugal blower 10 and by-pass valve control 17.
The deduster port of export is connected to large centrifugal fan 10, valve and chimney 16 with pipeline, and native system also is provided with auxillary flue 15.In case catastrophe failure appears in whole system when needing emergency service, flue gas also can be discharged from chimney by valve via auxillary flue.
Adopt alumina powder to make adsorbent, the specific area 〉=35m of alumina powder in the present embodiment 2/ kg.In the alumina powder that Venturi tube is filled, the proportioning of cyclic oxidation aluminium powder and fresh aluminum oxide is 1: 1.The bitumen flue gas typical temperature is 90 ± 5 ℃, when purifying flue gas, at first allow it enter the Venturi tube of filling alumina powder, fully contact, react with the alumina powder surface, make the fully absorption of the oxidized aluminium powder of pitch droplet surface at Venturi tube medium pitch flue gas by valve; Then the flue gas by alumina powder is imported gas-solid separator, remove alumina powder through deduster again, purified in the flue gas this moment and can reach state environmental emissioning standard.And being admitted to incinerator, the alumina powder of saturated pitch droplet and micro mist fully burn, oxide aluminum powder after the burning is promptly sent into cyclic oxidation aluminium powder basin after the cooling cyclone cooling, and the flue gas after burning purifies the bitumen flue gas that imports Venturi tube again and do not purify again again through the spray cooler cooling.Flue gas after being purified back up to standard is discharged by chimney by valve and large blower.Use the native system asphalt flue gas purifying, its purification efficiency can reach more than 98%.
Spray cooler of the present invention is a vertical structure, and its nozzle has good sprayability, because employing PLC regulates the pressure when atomizing, cooling water is evaporated fully; And the alumina powder after the pitch droplet burning is except that part recycles, and most of raw material as electrolytic aluminium is so native system finally reaches the waste gas of national environmental standard no waste residue and waste water discharge except that discharging through after the purified treatment.
Embodiment 2
The method and apparatus of present embodiment is identical with embodiment 1.
The adsorbent of using at the venturi reactor also is an alumina powder, its specific surface 〉=35m 2/ kg, wherein the ratio of cyclic oxidation aluminium powder and fresh aluminum oxide powder is 2: 1.Adopt this technology and its purification efficiency of device asphalt flue gas purifying to reach more than 98%.
Embodiment 3
The method of present embodiment is identical with embodiment 1,2.But gas solid reactor then adopts adsorbent bed.Adsorbent bed can be the vertical cylindrical container that has four openings, also can be the horizontal cylindrical container that has four openings.An opening is the bitumen flue gas inlet, and one is the outlet that purifies flue gas, and one is the alumina particle import, and another is the outlet of the alumina particle of adsorptive pitch flue gas.Purify exhanst gas outlet and be connected to gas-solid separator, and the alumina particle outlet is connected to incinerator.The alumina particle import is connected to fresh aluminum oxide particle basin and cyclic oxidation alumina particles basin.Again through the sedimentation dedusting, bituminous droplet and micronic dust can not arranged to by-pass valve control after the purification flue gas process gas solid separation.Alumina particle is an activated alumina, and it has loose structure, and its absorption property is better than common alumina powder.As long as activated alumina reaches 0.2-0.5m in adsorbent bed thick, the ratio of wherein circulate activated alumina and fresh activated alumina can be 2: 1, and the purification efficiency of this device reaches more than 98%.
Core technology feature of the present invention is to adopt alumina powder or activated alumina to make adsorbent.With method and apparatus asphalt flue gas purifying of the present invention except with the alumina adsorption flue gas, by gas solid separation with after burning, and, gas cleaning efficient is improved greatly by circulation repeatedly, gross efficiency can reach more than 98%, and its social benefit and economic benefit are all very considerable.

Claims (8)

1. a bitumen flue gas purifying method is transported to the cleaning system inlet with bitumen flue gas through pipeline, purifies by gas-solid reaction, burning, each operation of dedusting, it is characterized in that:
(1) advanced promoting the circulation of qi is reacted admittedly, with solid absorbent bitumen flue gas is fully adsorbed;
(2) carry out gas solid separation again, make gas-solid reaction after bitumeniferous adsorbent separate with flue gas after being purified;
(3) flue gas after the gas solid separation is carried out the sedimentation dust removal process;
(4) the bitumeniferous solid absorbent after the gas-solid reaction is fully burned with air blast and fuel under Controlled by Programmable Controller;
(5) flue gas after will burning spray cooling with lower the temperature, dedusting;
(6) detect flue gas after cooling, the dedusting by by-pass valve control, up to standardly then directly discharge by chimney; Below standardly then send into gas-solid reaction operation circulation again and repeatedly purify.
2. by the described bitumen flue gas purifying method of claim 1, it is characterized in that said solid absorbent is an alumina powder.
3. by the described bitumen flue gas purifying method of claim 2, it is characterized in that said alumina powder is the cyclic oxidation aluminium powder that fresh aluminum oxide powder and a part of adsorptive pitch flue gas cooled off with whirlwind after burning.
4. an apparatus system of implementing the described bitumen flue gas purifying method of claim 1 comprises gas solid reactor, gas-solid separator, incinerator, it is characterized in that:
(1) gas solid reactor adopts venturi reactor or adsorbent bed to constitute;
(2) gas-solid separator is the sack cleaner of sandwich construction;
(3) incinerator adopts natural gas or heavy oil to make fuel, controls combustion process with air blast;
(4) be provided with cooling cyclone and spray cooler in addition.
5. by the described apparatus system of claim 4, what it is characterized in that the filling of said venturi reactor is alumina powder.
6. by the described apparatus system of claim 4, what it is characterized in that said adsorbent bed employing is the reactivity aluminium oxide.
7. by the described apparatus system of claim 4, it is characterized in that the vavle shelf system of said incinerator and spray cooler adopts Programmable Logic Controller to control automatically.
8. by the described apparatus system of claim 4, it is characterized in that said incinerator bottom is mounted with cooling cyclone in addition.
CNB200610046475XA 2006-04-29 2006-04-29 A kind of bitumen flue gas purifying method Expired - Fee Related CN100563783C (en)

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Publication number Priority date Publication date Assignee Title
CN102000483A (en) * 2010-09-29 2011-04-06 云南源鑫炭素有限公司 Method for treating asphalt gas efficiently and harmlessly
CN102463022B (en) * 2010-11-04 2014-04-30 上海宝钢化工有限公司 Method and apparatus for absorbing asphalt smoke
CN103127809B (en) * 2011-11-25 2015-06-10 辽宁北环净化技术有限公司 Dry type dust removing method for asphalt flue gas
CN103007683B (en) * 2012-12-25 2015-03-25 辽宁环宇环保技术有限公司 System and method for purifying flue gas in cathode electrode roasting kiln and recycling and reusing solid waste
CN103537187B (en) * 2013-10-24 2015-11-25 北京诺曼斯佰环保科技有限公司 A kind of method of rich sulfur dioxide gas cleaning system and gas purification sulphur
CN103691247B (en) * 2014-01-03 2015-07-29 沈阳博达机械有限公司 A kind of purifying and dedusting device for bitumen flue gas
CN104785065A (en) * 2015-05-13 2015-07-22 常州禹豪防水科技有限公司 Asphalt waste gas treatment device and treatment process thereof
CN105536516A (en) * 2015-12-11 2016-05-04 凯天环保科技股份有限公司 Device for microwave catalytic treatment of organic waste gas and treatment method thereof
CN107270725B (en) * 2017-06-13 2019-01-29 东北大学 Aluminium electrolytic equipment, aluminium electroloysis system and method for recovering flue gas waste heat of aluminum electrolysis cell

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