CN106311468B - One kind cooling coagulation and device and method - Google Patents
One kind cooling coagulation and device and method Download PDFInfo
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- CN106311468B CN106311468B CN201510369213.6A CN201510369213A CN106311468B CN 106311468 B CN106311468 B CN 106311468B CN 201510369213 A CN201510369213 A CN 201510369213A CN 106311468 B CN106311468 B CN 106311468B
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Abstract
The invention provides one kind cooling coagulation and device, it includes：Shell, its head end and end offer entrance and exit respectively, need the gas of dedusting to flow into from the entrance and flowed out from the outlet to enable；Component is ionized, it is arranged on the inside of the shell, for causing the particle in the gas in the shell powered；Heat-exchanging component, it is arranged on the inside of the shell, for causing the gas in the shell to cool.The present invention enables to flue gas cool-down and dust coalescence while realizes and can promote coalescence effect, reduces dust specific resistance, the field gas velocity of the follow-up electric cleaner of reduction, raising system dust removing efficiency, significantly improves the combination property of coalescence device.
Description
Technical field
The invention belongs to industrial flue gas cleaning field, more particularly to a kind of cooling coagulation and device and method.
Background technology
Currently, China has turned into one of area that fine particle pollution is the most serious in the world, serious haze weather frequency
Numerous appearance, PM2.5 have turned into the focus noun of society, and the management of fine particle pollution is unprecedented,《Surrounding air matter
Amount standard》GB3095-2012 is additionally arranged the Air Pollutant Emission that PM2.5 limit entry, thermoelectricity, metallurgy etc. mainly pollutes field
Standard is revised comprehensively, and key area and city are also corresponding to have put into effect more strict provincial standard, and particulate matter is administered and enters essence
Elaboration phase.
Industrial circle high-effective dust-removing equipment is mainly electric cleaner and the class of sack cleaner two.Electric cleaner is stable,
Resistance damage is small, can handle high temperature, high-humidity gas fume, but is influenceed by dust specific resistance big, not high to fine dust capture rate.Bag-type dust
Device is stable efficiently, normal work can guarantee that dust emission concentration control in 30mg/Nm3Hereinafter, but it is difficult to reach clean row
Put, ultra-fine discharge, and filtrate is difficult to the normal work in the case of high temperature or high humidity, running resistance is big.For these reasons, currently
Two kinds of main cleaners are difficult to the atmosphere pollutants emission standardses that satisfaction increasingly improves to the capture rate of fine dust
It is required that.
Theoretical according to basic dedusting, deduster dust-collecting efficiency is directly related with powder dust particle particle diameter, i.e., dust size is thick,
Purification efficiency is just high in deduster, and actual industrial cleaner running also demonstrates this theoretical, electric cleaner and cloth bag
For deduster to the capture rate compared with crude particle dust almost 100%, most of dust of equipment end escape is fine dust.If
Before flue dust enters deduster, the mutual Collision coagulation of powder dust particle is made together by external force, by minuteness particle and other particles
Coalescence forms new relatively corase particles together, so that the notable thickening of the particle diameter distribution of flue dust, then can be in deduster
More efficiently trapped.External force form coalescence by electric field force is most strong solidifying of currently generally acknowledged most effective, operability
And mode, referred to as coagulation are simultaneously.
Patent publication No. is the patent application text of CN1390157A entitled " method and apparatus of aggregated particle "
Entitled " bipolar corona discharge soot coalescence electro dust removing method and its equipment " of part, Publication No. CN1603004A
Patent application document, Publication No. CN102836779A entitled " a kind of dipolar charge electrostatic coagulation dust removing apparatus ",
And the patent application document of Publication No. CN201329312Y utility model entitled " coagulation type high-voltage electrostatic precipitator ",
Respective particle coagulation and method or equipment are individually disclosed, is sent out by directional migration after particle in the electric field the lotus charges of different polarity
Raw intersection-type collision, forms new relatively coarse granule, so that flue dust particle diameter is significantly roughened, lifts its catching in follow-up cleaner
Collection rate.
But foregoing coagulation and apparatus and method be merely by electric field force coalescence area change dust direct of travel come
Primary collision is formed, coalescence performance has much room for improvement, and coalescer only plays simple particle thickening, to flue gas and follow-up dedusting
Device no change and remaining auxiliary dust collection effect.And industrial flue gas cleaning system completes separate unit operation rank still in self-contained unit
The essentially tandem compound such as section, deduster, desulfurizing tower, Benitration reactor, long flow path, takes up an area greatly, with Air Pollutant Emission
Standard is more and more tighter, and first choice will be turned into by taking up an area small, complex function type, the purification method for focusing on systemic effect and equipment, for electricity
The equipment of this kind of auxiliary synergy of coalescer is especially true.
The content of the invention
In order to solve above mentioned problem of the prior art, the invention provides one kind cooling coagulation and device, it includes：Outside
Shell, its head end and end offer entrance and exit respectively, to enable the gas for needing dedusting to be flowed into simultaneously from the entrance
From the outlet outflow；Component is ionized, it is arranged on the inside of the shell, for causing the grain in the gas in the shell
Subband electricity；Heat-exchanging component, it is arranged on the inside of the shell, for causing the gas in the shell to cool.
Further, the ionization component is arranged including multiple discharge electrodes, and each discharge electrode row includes matrix arrangement
Multiple discharge lines, parallel to each other between the multiple discharge electrode row and be separated with preset distance with each other, each discharge lines
High voltage power supply is all connected to, to cause the positive-negative polarity of multiple discharge lines in each discharge electrode row identical, and phase
The positive-negative polarity of two adjacent discharge electrode rows is opposite.
Preferably, the bearing of trend of each discharge lines is vertical with the flow direction of the gas in the housing.
Further, the heat-exchanging component is the heat exchanger tube for flowing cooling water, and the heat exchanger tube is from the housing
End enters the inside of the housing, and stretches out the housing from the head end of the housing.
Preferably, the heat exchanger tube enters the inside of the housing from the top of the end of the housing, and from the shell
The housing is stretched out in the bottom of the head end of body.
Further, the heat exchanger tube is formed as multiple sections interconnected, each institute in the part of the inside of the housing
State section to be arranged between the discharge electrode row of adjacent two, the stream of each described section of bearing of trend and the gas in the housing
Dynamic direction is parallel.
Preferably, each described section is all formed as coiled pipe.
Present invention also offers one kind cooling coagulation and method, it comprises the following steps：The gas for needing dedusting is passed through
The entrance of the shell；Open the high voltage power supply so that the particle in gas around each discharge electrode row is powered, and
And the electric charge of particle institute band polarity it is adjacent the discharge electrode row polarity it is identical；Continue to be passed through into the heat exchanger tube
Cooling water so that the gas cooling in the housing.
The cooling coagulation and device and method of the present invention so that flue gas cool-down is realized and can promoted with dust coalescence simultaneously
Coalescence effect, the field gas velocity for reducing dust specific resistance, reducing follow-up electric cleaner, system dust removing efficiency is improved, significantly improved
The combination property of coalescence device.
Brief description of the drawings
Fig. 1 is the structural representation of boiler flue gas purification system；
Fig. 2 is the cooling coagulation of the present invention and the dimensional structure diagram of device；
Fig. 3 is that the structural representation after shell is removed in Fig. 2；
Fig. 4 is the structural representation of the amplification of the discharge electrode row in Fig. 3；
Fig. 5 is the structural representation of the cooling coagulation of the invention and device shown in cutaway fashion.
Description of reference numerals：
1- boilers, 2- Benitration reactors, 3- air preheaters, simultaneously device, 5- electric cleaners, 6- blower fans, 7- take off 4- coolings coagulation
Sulphur tower, 8- chimneys,
410- shells, 411- entrances, 412- outlets,
421- discharge electrodes are arranged, 4211- frameworks, 4212- discharge lines,
431- water intake ends, 432- water sides, 433- sections.
Embodiment
The cooling coagulation to the present invention and device and method are made further detailed with reference to the accompanying drawings and detailed description
Thin description, but it is not as a limitation of the invention.
The boiler flue gas purification system that Fig. 1 show the cooling coagulation of the present invention and device is applicable, cleaning system is by successively
The boiler 1 of connection, Benitration reactor 2, air preheater 3, cooling coagulation and device 4, electric cleaner 5, blower fan 6, desulfurizing tower 7 and
Chimney 8 forms.Simultaneously device 4 causes the powder dust particle in flue gas (gas for needing dedusting) mutually to collide coalescence to cooling coagulation,
So that the dust granules in flue gas substantially become big, it is more beneficial for follow-up electric cleaner 5 and carries out dedusting.
Referring to the cooling coagulation and device of Fig. 2 to Fig. 5 description present invention.The device includes shell 410 and set
Ionization component and heat-exchanging component inside shell 410.Wherein, the head end of shell 410 and end offer the He of entrance 411 respectively
Outlet 412, to enable the gas for needing dedusting to be flowed into from entrance 411, from the outflow (direction shown in dotted line in figure of outlet 412
For the flow direction of gas).Ionization component is used to make to need opposite polarity electric charge on the particle band in the gas of dedusting, heat exchange
Component is used to make to need the gas of dedusting to cool, so as to be more beneficial for the collision of particle cohesion.
Specifically, for reference picture 3 to Fig. 5, ionization component includes discharge electrode row multiple parallel to each other and apart from one another by setting
421, each discharge electrode row is respectively to the gas discharge around it so that charging particle therein.In order that it is charged after particle
It can be collided with each other in the presence of electric field, adjacent two discharge electrode rows 421 must have opposite positive-negative polarity.
Preferably, each discharge electrode row 421 includes multiple discharge lines 4212 of matrix arrangement, and multiple discharge lines 4212 are logical
Framework 4211 is crossed to fix to be formed as plane discharge electrode row 421.Each discharge lines 4212 are all connected to high voltage power supply, and
The positive-negative polarity all same of all discharge lines 4212 in same discharge electrode row 421, but arranged with adjacent discharge electrode in 421
The positive-negative polarity of discharge lines 4212 is opposite.
In order that discharge electrode row 421 can discharge the air above and below it, discharge lines 4212 are respectively to putting
The extension of both direction up and down of electrode row 421.
Discharge lines 4212 can be double angle prickle wire or V15 lines etc., and two adjacent discharge electrodes arrange the centre-to-centre spacing between 421
Preferably 250~350mm, the centre-to-centre spacing between adjacent discharge lines 4212 is 100~200mm, is specifically needed according to discharge lines
4212 model determines.
In order that it is best to obtain coalescence effect, it is preferable that the in-plane of each discharge electrode row 421 and the flow direction of gas
It is parallel.
Reference picture 2, Fig. 3 and Fig. 5, it is preferable that heat-exchanging component is the heat exchanger tube for flowing cooling water.In order that obtain housing
The direction that the temperature of gas in 410 flows along gas reduces successively, it is preferable that heat exchanger tube enters from the end of housing 410
The inside of housing 410, and stretch out housing 410 from the head end of housing 410.That is, the part that heat exchanger tube stretches out the end of housing 410 is
The water intake end 431 of heat exchanger tube, it stretches out the water side 432 that the part of the head end of housing 410 is heat exchanger tube.
For the ease of the flowing of cooling water, it is preferable that heat exchanger tube enters housing 410 from the top of the end of housing 410, and
Housing 410 is stretched out from the bottom of the head end of housing 410.
In order that obtaining, heat exchanger tube is more preferable to the cooling-down effect of gas, and the heat exchanger tube is formed as mutual the inside of housing 410
Multiple sections 433 to be connected, each section 433 be both designed as coiled pipe or finned tube type into it is plane, with cause heat exchange more
Add it is uniform effectively, be separately positioned between adjacent two discharge electrodes row 421 for each section 433 and discharge electrode row 421 and housing
Interval between 410, and it is parallel with discharge electrode row 421.Each section 433 of the bearing of trend (flow of cooling water i.e. in heat exchanger tube
Trend direction, not every a bit of cooling water in coiled pipe flow direction) with housing 410 in gas flowing side
To parallel.
Preferably, a diameter of 25~75mm of heat exchanger tube, wall thickness are 2~5mm, and side wall spacing is 10~25mm, water intake end
431st, water side 432 and each section 433 of caliber are identical.Centre-to-centre spacing between two adjacent sections 433 is preferably 250~
350mm。
As described above, formd in cooling coagulation of the invention and device 4 from top to bottom it is alternatively distributed it is multiple just,
Negative discharge channel, each positive discharge channel by two parallel arrangements heat exchanger tube snakelike section 433 and be placed in one and (be preferably
Middle) connect positive high voltage power supply discharge electrode row 421 composition；Each negative discharge channel is by two heat exchanger tubes being arranged in parallel
Snakelike section 433 and the composition of the discharge electrode for connecing negative high voltage power supply row 421 of (be preferably middle) of being placed in one.
Present invention also offers one kind cooling coagulation and method, and it is based on above-mentioned cooling coagulation simultaneously device 4, and including such as
Lower step：
S1., the gas for needing dedusting is passed through to the entrance 411 of shell 410.Boiler 1 discharge flue gas through Benitration reactor 2,
After air preheater 3, into cooling coagulation and device 4, now temperature is higher, and flue dust is higher without any processing, dust specific resistance.
S2. the high voltage power supply that discharge lines 4212 connect is opened so that each positive and negative electric discharge of cooling coagulation and device 4 is logical
Road produces corona ionization flue gas, substantial amounts of electronics and free ion is produced inside electric field, after flue gas enters electric field, flue dust exists
The difference positive and negative electricity of lotus in positive and negative discharge channel.Flue dust after charged is by discharge lines pair in two neighboring heteropolarity discharge channel
Same polarity discharge lines are to its repulsive force in its attraction and this passage, and under the collective effect of two kinds of power, it changes row
Enter direction, i.e., deviate from the direction shown in dotted line, moved to adjacency channel, and with being moved through what is come to this passage in adjacency channel
Intersection-type collision occurs for flue dust, assembles so as to which coalescence occur, forms new relatively coarse granule flue dust.
S3. while step S2 is carried out, continue to be passed through cooling water into heat exchanger tube so that the gas drop in housing 410
Temperature.Cold water is continuously passed through by water intake end 431, is advanced forward in each section 433 into the cold water after heat exchanger tube, passes through tube wall
Exchanged heat with flue gas so that flue gas cool-down, heat up after cold water heat exchange and discharged from water side 432.During heat exchange, flue gas
Temperature gradually reduce, the volume of flue gas synchronously reduces, and the flow velocity of flue gas and flue dust also decreases, and closer to outlet
The temperature of flue gas at 412 is lower, and the movement velocity of its flue dust is also slower.After the smoke particle entered at different moments is due to cooling
Caused speed difference can pursue and attack collision so that coagulation and while also exist cooling coalescence, so as to enhance coalescence effect
Should.
Especially, operating personnel can control the flow velocity and flow of cooling water, to cause at the outlet 412 of shell 410
Dew-point temperature of the temperature of gas close to and above the gas, i.e. when flue gas reaches the outlet 412 of cooling coagulation and device 4,
Flue-gas temperature is reduced to the dew-point temperature of a little higher than flue gas, such as higher than 3~10 DEG C of flue gas dew point temperature, to reach optimal
Cool coalescence effect, is advantageous to follow-up dust removal step again.The dew-point temperature of flue gas is related to the composition of flue gas, can pass through meter
Calculate or actual measurement obtains.
Meanwhile in order to ensure more preferable coagulation and effect, the voltage of high voltage power supply can be adjusted as needed, to change
Degree of ionization in electric field.For example, it can be adjusted according to the dust removing effects of the electric cleaner 5 after cooling coagulation and device 4
The voltage of high voltage power supply, when dust removing effects are less than predetermined standard time, the voltage of high voltage power supply is raised, when dust removing effects are higher than predetermined
During standard, the voltage of high voltage power supply is reduced.
For example, when the mean wind speed of electric field region is 8~12m/s, the flue gas that boiler 1 is discharged is pre- through Benitration reactor 2, sky
After device 3, into cooling coagulation and device 4, its temperature is 135 DEG C, dust specific resistance 1.26 × 1012Ω cm, the dew of the flue gas
Point temperature is 90 DEG C.After cooling coagulation and device 4, the PM2.5 in flue gas reduces 35%, exports the dust ratio at 412
Resistance is down to 6.54 × 1010Ω cm, the operating voltage of electric cleaner 5 are lifted from the 56kV before cool coagulation and the unlatching of device 4
To 62kV, dust emission concentration after electric cleaner 5 is from 58mg/m3It is down to 43mg/m3。
It can be seen that cooling coagulation of the invention and device and method, while coagulation ice and cooling coalescence have been used, in a dress
The multiple intersection-type collision of flue dust, efficient coalescence thickening are realized in putting；The temperature of flue gas significantly reduces simultaneously, and flue gas volume is also same
Step reduces so that the field gas velocity of follow-up electric cleaner decreases, and the residence time increases, and is favorably improved dust-collecting efficiency；
In addition, flue dust temperature reduces, dust specific resistance also reduces therewith, and the adverse effect such as inverse corona is eliminated；Simultaneously in flue gas
Grain and heat motion of gas molecules reduced capability, gas breakdown voltage improve, and dust migration velocity improves, and further moving system removes
The lifting of dirt efficiency, so as to be integrally improved the coalescence performance of cooling coagulation and device, the gathering dust property of auxiliary of its synthesis is expanded
Energy.
Above embodiment is only the illustrative embodiments of the present invention, it is impossible to be used in limits the present invention, the present invention
Protection domain be defined by the claims.Those skilled in the art can be in the essence and protection domain of the present invention, to this
Various modifications or equivalent substitution are made in invention, and these modifications or equivalent substitution also should be regarded as being within the scope of the present invention.
Claims (8)
1. one kind cooling coagulation and device, it is characterised in that including：
Shell, its head end and end offer entrance and exit respectively, need the gas of dedusting from the entrance to enable
Flow into and flowed out from the outlet；
Component is ionized, it is arranged on the inside of the shell, and the ionization component includes multiple parallel to each other and spaced set
The discharge electrode row put, the ionization component are used to make it that the particle in the gas in the shell is powered；
Heat-exchanging component, it is arranged on the inside of the shell, and the heat-exchanging component is the heat exchanger tube for flowing cooling water, described
Heat exchanger tube is formed as multiple sections interconnected in the part of the inside of the shell, and each described section is arranged on two adjacent institutes
Between stating discharge electrode row, each described section of bearing of trend is parallel with the flow direction of the gas in the shell, the heat exchange group
The gas cooling that part is used to cause in the shell.
2. cooling coagulation according to claim 1 and device, it is characterised in that each discharge electrode row includes matrix form
Multiple discharge lines extended respectively to the both direction up and down that the discharge electrode is arranged of arrangement, the multiple discharge electrode are mutual between arranging
It is alternate to be separated with preset distance,
Each discharge lines are all connected to high voltage power supply, to cause multiple discharge lines in each discharge electrode row
Positive-negative polarity is identical, and the positive-negative polarity of adjacent two discharge electrode rows is opposite.
3. cooling coagulation and device according to claim 2, it is characterised in that the in-plane of each discharge electrode row with
The flow direction of gas in the shell is parallel.
4. cooling coagulation and device according to claim 2, it is characterised in that the heat exchanger tube is from the end of the shell
The shell is stretched out into the inside of the shell, and from the head end of the shell.
5. cooling coagulation and device according to claim 4, it is characterised in that the heat exchanger tube is from the end of the shell
Top enter the inside of the shell, and stretch out the shell from the bottom of the head end of the shell.
6. cooling coagulation according to claim 1 and device, it is characterised in that each described section is all formed as coiled pipe.
7. the cooling coagulation and method of a kind of cooling coagulation based on described in claim 4 and device, it is characterised in that including such as
Lower step：
The gas for needing dedusting is passed through to the entrance of the shell；
Open the high voltage power supply so that the particle in gas around each discharge electrode row is powered, and particle institute band
Electric charge polarity it is adjacent the discharge electrode row polarity it is identical；
Continue to be passed through cooling water into the heat exchanger tube so that the gas cooling in the shell.
8. cooling coagulation according to claim 7 and method, it is characterised in that also include：Control the stream of the cooling water
Speed and flow so that dew-point temperature of the temperature of the gas in the exit of the shell close to and above the gas.
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| CN107138016A (en) * | 2017-05-08 | 2017-09-08 | 浙江大学 | Based on many particulate matter coalescence reunion intensifying devices promoted and method |
| CN107457078A (en) * | 2017-09-19 | 2017-12-12 | 东北师范大学 | The adjustable irregular arista electrode plate of Temperature Distribution based on Internet of Things |
| CN107694758B (en) * | 2017-11-10 | 2020-10-02 | 中国石油大学(华东) | Low low temperature is condenser tube that discharges for electrostatic precipitator |
| CN114192280B (en) * | 2021-11-11 | 2023-08-18 | 江苏吉能达环境能源科技有限公司 | Water vapor and dust dry-wet separation type dust remover |
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