CN100475348C - Technique for dust removal with electricity combined with fabric, and equipment thereof - Google Patents

Abstract

An electricity and cloth combined dusting technology includes such steps as removing dust from the fume in horizontal electric duster, removing dust from the fume in horizontal cloth-bag duster, and exhausting clean fume. Its apparatus is composed of a horizontal casing with dust contained fume inlet and clean fume outlet, an electric duster, a cloth-bag dust, and a fume flow distribution regulator.

Description

Technique for dust removal combined electricity with fabric and equipment thereof

Technical field:

The present invention relates to dust collecting process and equipment thereof, particularly electrostatic precipitator and sack cleaner field technique for dust removal combined electricity with fabric and equipment thereof.

Background technology:

Dedusting technology is the technology that captures, separates the solid particulate matters such as dust in the dust-contained airflow, and what run in the industrial dedusting technology often is that the air-flow that carries solid particle is carried out gas solid separation; At present, industrial can reach the national environmental protection emission request, what enter large-scale practical application is electrostatic precipitator and sack cleaner.Electrostatic precipitator contains shell, has connected air inlet and air outlet on the shell, and air outlet links to each other with blower fan, the HVDC electrode has been installed in the chamber in the enclosure, utilize the potential difference on the HVDC electrode to form electric field, in dusty gas, inject charged electron stream, make dust charged.Charged dust is assembled to dust collecting pole plate under the electric field force effect, has realized the purpose that dust is separated from dusty gas.It is very big that its efficiency of dust collection is influenced by dust performance and flue gas condition, and be the exponential curve variation with dedusting pole plate area.The electrostatic precipitator that three electric fields are arranged, the efficiency of dust collection of its first electric field are usually about 80～90%, and second, third electric field is only collected in the dusty gas about 10～20% dust.Sometimes in order to reach 20～30mg/Nm ³Concentration of emission, need set up the 4th, the 5th electric field, need to increase very big equipment investment in order to collect dust seldom.Sack cleaner contains shell, has connected air inlet and air outlet on the shell, and the bag chamber has been installed in the chamber in the enclosure, bag has been laid cloth bag in the chamber, the deashing blower fan has been installed on the outer side edges of shell, and the air outlet on the shell interlinks with the air outlet of bag chamber, and the air outlet on the shell links to each other with blower fan.The characteristics of sack cleaner are: the efficiency of dust collection height, particularly fine dust there is higher efficient, and generally can reach more than 99.5%; Adaptability is strong, can capture dust of different nature; Handling air quantity can be by per hour hundreds of cubic metre to per hour hundreds thousand of cubic metres; Working stability is convenient to reclaim siccative, safeguards simple.But sack cleaner is subjected to the heatproof of filtrate, the limitation of performance such as corrosion-resistant, and particularly aspect high temperature, filtrate (as the terylene Nomex) commonly used at present is applicable to 120～130 ℃, and glass fiber filter material can be anti-about 250 ℃; When flue-gas temperature is higher, need to adopt the higher special filtrate of cost, perhaps will take cooling measure, this will cause the complicated of system architecture, and system cost also can increase thereupon; Be not suitable for caking property and can not be lower than dew-point temperature with bibulous dust, particularly flue-gas temperature by force, otherwise can produce dewfall, cause filter bag to stop up the dust pelletizing system cisco unity malfunction.In addition, when handling the air quantity increase, its floor space also increases thereupon.

China's utility model patent " electric filter-bag deduster ", the patent No. is 02224478.6, electrostatic precipitator and sack cleaner are installed in the same upright shell, the lower end of upright shell is an air inlet, the latter half of upright shell is the electric precipitation chamber, the electric precipitation chamber contains the tubular positive plate, grand cross negative electrode degree line between the tubular positive plate, the first half of upright shell is the bag-type dust chamber, be that some tying cloth bags are arranged in the bag-type dust chamber, electric precipitation chamber and bag-type dust chamber interpenetrate.But because upright shell is vertical placement, the electric precipitation chamber is in the Lower Half of upright shell, the bag-type dust chamber is at the first half of upright shell, this structure Design has been doomed the height of complete machine and has been subjected to certain restriction, this is very important miniaturization characteristics of this patent, so, the number of electric field and cloth bag can not be many, the length of cloth bag can not be oversize, and, because the cross section of upright shell can not be done too greatly, thereby the flue gas stream flow velocity in upright shell is higher, no matter be electric precipitation partly or the bag-type dust part, having little time under the situation that flue gas is filtered, flue gas just is discharged from, and these two technical indicators have very big influence to the dust removing effects of complete machine.

China's utility model patent " a kind of electric bag compound type dust remover ", the patent No. is 200420040846.X, comprise that horizontal type shell, horizontal type shell inner chamber have electric dust collector and bag-type dust collector, horizontal type shell has import smoke box and outlet smoke box, wherein ash-laden gas enters the electric dust collector dedusting of housing inner chamber from the import smoke box, level enters bag-type dust collector again, purifies the back and discharges from the outlet smoke box, and the flue gas flow equalizing device is arranged between electric dust collector and bag-type dust collector.Because the flue gas flow equalizing device is that fix, uncontrollable, so, increase along with dust stratification on the cloth bag of deduster rear portion bag-type dust collector, when the distribution of flue gas flow rate in the cross section of deduster changes, the efficiency of dust collection of anterior electric dust collector will reduce greatly, and total efficiency of dust collection also can descend thereupon.

Summary of the invention:

The object of the present invention is to provide a kind of efficiency of dust collection height, technique for dust removal combined electricity with fabric and equipment thereof that use cost is low.

Technique for dust removal combined electricity with fabric solution of the present invention is: the electric precipitation that the ash-laden gas air inlet of ash-laden gas from horizontal shell enters the horizontal shell inner cavity partly carries out dust removal process, the bag-type dust that enters in the horizontal shell inner cavity of level partly carries out dust removal process again, to purify flue gas at last discharges from the purification flue gas gas outlet on the horizontal shell, delta data according to detected flue gas stream flow velocity, compare by computer and predefined theoretical value, comprehensive analysis processing, again according to the result of calculation output order, it is characterized in that before ash-laden gas carries out the bag-type dust processing, the flue gas stream velocity flow profile of deduster cross section is regulated by computer.

Before ash-laden gas carries out the bag-type dust processing, detect the delta data that flue gas flows flow velocity by a plurality of highly sensitive anemobiagraph that is located on the deduster cross section.

Dust removal combined electricity with fabric equipment solution of the present invention is: contain shell, outer casing underpart is an ash bucket, shell is horizontal shell, the inner chamber of horizontal shell connects, the ash-laden gas air inlet is arranged on the horizontal shell and purify the flue gas gas outlet, part by the ash-laden gas air inlet in the horizontal shell inner cavity is the electric precipitation part, part by purification flue gas gas outlet in the horizontal shell inner cavity is the bag-type dust part, between electric precipitation part and bag-type dust part, flue gas stream profile adjustment device has been installed, on the deduster cross section before the bag-type dust part a plurality of highly sensitive anemobiagraphs has been arranged.

The present invention organically combines electric cleaner and sack cleaner technology, and electric precipitation part and bag-type dust part are all horizontally disposed, after ash-laden gas enters this equipment, the electric cleaner of one to three electric field has been adopted in the front portion, can collect in the flue gas 80%～99% particle than meal dirt, the bag-type dust part that the tiny dust granules level of particle diameter that residue flows with flue gas stream enters the rear portion, because residue ash amount seldom, the cloth bag load is low, cleaning cycle extends greatly, and cloth bag is doubled and redoubled service life.Bag-type dust partly contains many group cloth bags, and because ash-laden gas is to enter the bag-type dust chamber from the side, thereby, flue gas resistance is little, and filter efficiency is higher, can be collected the dust granules more than 99.5%, total efficiency of dust collection reaches more than 99.9%, can make the dust contained flue gas concentration of emission reach 30mg/Nm ³Below.

Description of drawings:

Accompanying drawing is the fundamental diagram of the embodiment of the invention.

Among the figure: 1--ash-laden gas air inlet; 2--inlet air flow even distribution device; The 3--negative electrode; The 4--anode; 5--suspends beam in midair; The 6--boom hoisting; 7--flue gas stream profile adjustment device; The 8--deflector; The 9--guide vane; The 10--cloth bag; 11--hangs orifice plate; The 12--hole; 13--anti-blow cleaning dust device; 14--purifies smoke chamber; 15--purifies the flue gas gas outlet; The horizontal shell of 16--; The 17--ash bucket.

The specific embodiment:

Below in conjunction with accompanying drawing embodiments of the invention are described in detail:

Technique for dust removal combined electricity with fabric: ash-laden gas enters horizontal shell 16 inner chambers from the ash-laden gas air inlet 1 on the horizontal shell 16, make the flue gas stream velocity flow profile that enters the electric precipitation part even by being located at the preceding inlet air flow even distribution device of electric precipitation part, enter electric precipitation then and partly carry out the electric precipitation processing; Detect the delta data that the flue gas of handling through electric precipitation flows flow velocity by a plurality of highly sensitive anemobiagraph that is located on the preceding deduster cross section of bag-type dust part, data offer machine and calculate machine, by computer and predefined theoretical value compare, comprehensive analysis processing, again according to the result of calculation output order, adjusting enters the flue gas stream velocity flow profile of bag-type dust part, enters bag-type dust then and partly carries out the bag-type dust processing; To purify flue gas at last discharges from the purification flue gas gas outlet 15 on the horizontal shell 16.

Dust removal combined electricity with fabric equipment: contain shell, shell is horizontal shell 16, and horizontal shell 16 bottoms are ash buckets 17.The inner chamber of horizontal shell 16 connects, ash-laden gas air inlet 1 is arranged on the horizontal shell 16 and purify flue gas gas outlet 15, part by ash-laden gas air inlet 1 in horizontal shell 16 inner chambers is the electric precipitation part, between ash-laden gas air inlet 1 and electric precipitation part, inlet air flow even distribution device 2 has been installed, because diffusion reduces the dust-contained airflow speed that enters at a high speed, and make the cross-sectional flow of inner chamber of horizontal shell 16 even by inlet air flow even distribution device 2.Electric precipitation partly contains two electric fields, arrange negative electrode 3 and anode 4 in the electric field at interval, form charging area,, make its polar motion that becomes through charged to dust, charged dust is attached on the anode 4, through mechanical vibrator, dust becomes bulk to fall into ash bucket 17, so repeatedly after 2 times, dust content is less in the flue gas that flows out from electric field, and level enters bag-type dust and partly carries out gathering dust the second time then.Bag-type dust partly contains two groups of cloth bags 10, cloth bag 10 interlaced arrangement, the hang of cloth bag 10 adopts fastening-type, the airtight cloth bag 10 of some end openings vertically is suspended on and hangs on the orifice plate 11, suitable for reading and the hole 12 that hangs on the orifice plate 11 of cloth bag 10 connects, the hole 12 that hangs on the orifice plate 11 communicates with purifying smoke chamber 14, purifies on the smoke chamber 14 to have connected purification flue gas gas outlet 15.The air-flow of cleaning enters cloth bag 10, flows out from the hole 12 that hangs on the orifice plate 11, imports to purify smoke chamber 14 and enter atmosphere.The suspention beam 5 of electric precipitation part top is connected by deflector 8 with the suspension orifice plate 11 of bag-type dust part top.What bag-type dust partly adopted is the outside filtering type sack cleaner, because deflector 8 is obliquely installed in the zone between electric precipitation part and bag-type dust part, and the bottom connects guide vane 9, guide vane 9 is installed on the regulating shaft, regulating shaft is driven by YE, computer compares analyzing and processing according to the actual measured value and the theoretical value of flue gas stream flow velocity, and assign instruction to YE, the driving regulating shaft rotates, driving guide vane 9 again rotates, to keep flue gas stream flow velocity even, make the electric field of anterior electric precipitation part can not cause large tracts of land flue gas stream dead band, improve efficiency of dust collection.Installed in the purification smoke chamber 14 in horizontal shell 16 inner chambers and be used to remove the anti-blow cleaning dust device 13 that is filtered and be collected at the dust on the cloth bag outer wall.Cloth bag 10 adopts the complex fire resistant material, regularly carries out the deashing operation, makes the dust that is collected in the cloth bag outer wall fall into ash bucket 17.Overhaul of the equipments boom hoisting 6 has been installed on the top of horizontal shell 16.

Claims (2)

1, technique for dust removal combined electricity with fabric, the electric precipitation that the ash-laden gas air inlet of ash-laden gas from horizontal shell enters the horizontal shell inner cavity partly carries out dust removal process, the bag-type dust that enters in the horizontal shell inner cavity of level partly carries out dust removal process again, to purify flue gas at last discharges from the purification flue gas gas outlet on the horizontal shell, it is characterized in that before ash-laden gas carries out the bag-type dust processing, detect the delta data that flue gas flows flow velocity by a plurality of highly sensitive anemobiagraph that is located on the deduster cross section, delta data according to detected flue gas stream flow velocity, compare by computer and predefined theoretical value, comprehensive analysis processing, according to the result of calculation output order, the flue gas stream velocity flow profile of deduster cross section is regulated again.

2, dust removal combined electricity with fabric equipment, contain shell, outer casing underpart is an ash bucket, shell is horizontal shell, the inner chamber of horizontal shell connects, the ash-laden gas air inlet is arranged on the horizontal shell and purify the flue gas gas outlet, part by the ash-laden gas air inlet in the horizontal shell inner cavity is the electric precipitation part, part by purification flue gas gas outlet in the horizontal shell inner cavity is the bag-type dust part, between electric precipitation part and bag-type dust part, flue gas stream profile adjustment device has been installed, has been it is characterized in that on the deduster cross section before the bag-type dust part a plurality of highly sensitive anemobiagraphs being arranged.