CN203777817U - Hot-air dust removing device for denitration - Google Patents
Hot-air dust removing device for denitration Download PDFInfo
- Publication number
- CN203777817U CN203777817U CN201320792168.1U CN201320792168U CN203777817U CN 203777817 U CN203777817 U CN 203777817U CN 201320792168 U CN201320792168 U CN 201320792168U CN 203777817 U CN203777817 U CN 203777817U
- Authority
- CN
- China
- Prior art keywords
- dust removing
- dust
- dedusting
- removing body
- whirlwind cyclone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 239000000428 dust Substances 0.000 title claims abstract description 98
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910001018 Cast iron Inorganic materials 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 4
- 239000003546 flue gas Substances 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 239000000446 fuel Substances 0.000 abstract description 2
- 238000000197 pyrolysis Methods 0.000 description 16
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 13
- 239000004202 carbamide Substances 0.000 description 13
- 239000002956 ash Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 230000009467 reduction Effects 0.000 description 5
- 238000006722 reduction reaction Methods 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010882 bottom ash Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 229910052902 vermiculite Inorganic materials 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
- 239000010455 vermiculite Substances 0.000 description 1
Abstract
The utility model relates to flue-gas denitration engineering and particularly relates to a hot-air dust removing device for denitration. The hot-air dust removing device comprises a dust removing body, a plurality of dust-removing cyclones, a flow guiding plate and a dust hopper, wherein the plurality of dust-removing cyclones are arranged in the dust removing body; the flow guiding plate is arranged in the dust removing body and at the upper part of the dust-removing cyclones; the flow guiding plate is of a stepped type distribution structure that the height is gradually reduced in the direction far away from a gas inlet of the dust removing body; the dust hopper is used for collecting dust. The hot-air dust removing device has the advantages that the operating requirement of a pyrolyzing furnace is met, the dust removing efficiency is high, dust in hot air can be effectively removed, and the consumption of fuel in the pyrolyzing furnace can be reduced, so that the pyrolyzing furnace can operate stably for long period and the purposes of saving energy and reducing consumption are achieved. The hot-air dust removing device has the advantages that the heat resistance, the wear resistance and the dust removing performance are good, and the defects that existing dust removing cyclones easily deform and facture when the pressure of a fan is changed suddenly are overcome.
Description
Technical field
The utility model relates to Flue Gas Denitrification Engineering, relates in particular to a kind of denitration hot air dust removing device.
Background technology
The method that existing steam power plant Flue Gas Denitrification Engineering takes the interior low-NOx combustor of stove and selective catalytic reduction denitration technology (Selective Catalytic Reduction, SCR) to combine.Reduction preparation system is mainly comprised of urea supply system, urea dissolution system, urea liquid cyclic delivery system, pyrolysis oven system.Urea is transported to dissolving tank by screw(-type) feeder, the deionized water that adds in proportion suitable temperature, utilize mixer stir and by control system, concentration regulated, dry urea is made to the urea liquid of 50% mass concentration, then by urea liquid feed pump, be transported to urea liquid storage tank; Circulation-supplied control system (HFD) is transported to metering and distributor by frequency variable circulating pump urea liquid in storage tank, and wherein unused portion turns back to urea liquid storage tank by back pressure control valve; Atomizing lance is controlled and distributed to metering according to the requirement of boiler different load, with distributor automatically, then sprays into Adiabatic Decomposition chamber; Meanwhile, diluent air (150 ℃) after steam heater (steam air heater) heating forms hot blast, enters decomposer.The thermal source of steam air heater is the steam of auxiliary vapour header, and steam consumption is: 100kg/h.By combustion control system, control pyrolysis chamber and reach the desired temperature of reduction.Urea droplets after atomization, in the indoor decomposition of Adiabatic Decomposition, generates NH
3, H
2o and CO
2, the ammonia after decomposition is diluted to and lower than the mist of 5% ammonia concentration, is delivered to ammonia spraying system (AIG) and enter denitrating system again by diluent air.
For reducing fuel oil, steam consumption, adopt hot blast to carry out pyrolysis, but hot blast is higher containing ash, can not steady in a long-term move, pyrolysis oven is after operation a period of time, and inner dust stratification is serious, needs stoppage in transit denitrating system to clear up.Pyrolysis dust deposit in furnace is serious, urea crystals; Fuel oil and heating steam consume larger, and operating cost is high.
In order to overcome the above problems, the utility model has been done useful improvement.
Utility model content
(1) technical problem that will solve
The purpose of this utility model is to provide a kind of denitration hot air dust removing device, solve denitration pyrolysis dust deposit in furnace and urea crystals problem, reduce hot blast dustiness, guarantee that denitration pyrolysis oven is being used under the method for operation of hot blast, reach operation object steady in a long-term, reach the object of effective reduction operating cost.
(2) technical scheme
The utility model is achieved through the following technical solutions: a kind of denitration hot air dust removing device, comprises
Dust removing body, described dust removing body is provided with dust removing body air inlet and dust removing body gas outlet;
A plurality of dedusting Whirlwind cyclones, are arranged in described dust removing body;
Deflector, described deflector is arranged in described dust removing body, and is placed in described dedusting Whirlwind cyclone top; Described deflector adopts step distributed architecture, and this deflector has towards reducing gradually attach structure away from described dust removing body air inlet direction;
Ash bucket, is arranged on the downside of described dust removing body, for collecting dust.
Wherein, the bottom of described a plurality of dedusting Whirlwind cyclones adopts inverted cone-shaped structure, and the outlet at bottom of this each dedusting Whirlwind cyclone is isolated mutually.
Further, the air inlet of described dedusting Whirlwind cyclone is provided with screw type flow deflector.
Particularly, the quantity of described screw type flow deflector is four, and the angle of the axial formation of described each screw type flow deflector and described dedusting Whirlwind cyclone is 25～30 degree.
Further, described dedusting Whirlwind cyclone inside is provided with taper screen ring in stream swirl district.
Wherein, described dedusting Whirlwind cyclone adopts cast iron or pottery to make.
(3) beneficial effect
Compare with product with prior art, the utility model has the following advantages:
1, the utility model can meet pyrolysis oven service requirement, has higher efficiency of dust collection, can effectively remove dust in hot blast, reduces pyrolysis oven fuel consume, makes the pyrolysis oven can long-period stable operation, reaches energy-saving and cost-reducing object.
2, denitration hot air dust removing device of the present utility model has good heat-resisting, anti-wear performance and dust removal performance; In addition, dedusting Whirlwind cyclone wall thickness, more than 6mm, has overcome the defect that existing dedusting Whirlwind cyclone is yielding when blower pressure is suddenlyd change, break.
Accompanying drawing explanation
Fig. 1 is denitration hot air dust removing device structure chart of the present utility model;
Fig. 2 is dust removing body structure chart of the present utility model;
Fig. 3 is the step block diagram of the method for the denitration hot blast dedusting in the present embodiment two.
In accompanying drawing, the component list of each label representative is as follows:
1, dust removing body; 2, dust removing body gas outlet; 3, ash bucket; 4, fixed support; 5, bulk cement storage tank; 6, dust removing body air inlet; 7, dedusting Whirlwind cyclone; 71, inverted cone-shaped structure; 72, Whirlwind cyclone outlet at bottom; 8, deflector; 9, Whirlwind cyclone gas outlet; 10, core pipe; 11, Whirlwind cyclone air inlet; 12, screw type flow deflector; 13, taper screen ring; 14, filler.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is made a detailed explanation.
Embodiment mono-
As shown in Figure 1, the present embodiment provides a kind of denitration hot air dust removing device, to entering the hot blast of pyrolysis chamber, carries out dust removal process.This denitration hot air dust removing device comprises dust removing body 1, a plurality of dedusting Whirlwind cyclone 7, deflector 8, ash bucket 3 and is arranged on the bulk cement storage tank 5 of ash bucket 3 downsides.Described dust removing body 1 is provided with dust removing body air inlet 6 and dust removing body gas outlet 2; Wherein, the position of dust removing body air inlet 6 is lower than 2 positions, described dust removing body gas outlet.
As shown in Figure 2, in described dust removing body 1, be provided with a plurality of dedusting Whirlwind cyclones 7; Described dedusting Whirlwind cyclone 7 can be arranged side by side, and each dedusting Whirlwind cyclone 7 is provided with core pipe 10, for discharging hot blast.Core pipe generally adopts stainless steel to make.The upper outlet of core pipe is Whirlwind cyclone gas outlet 9, and position will, higher than the height of described dust removing body air inlet 6, can effectively be avoided disturbing between air-flow.
Described deflector 8 is arranged in described dust removing body 1, and is placed in described dedusting Whirlwind cyclone 7 tops; Dedusting Whirlwind cyclone gas outlet 9 is arranged on this deflector 8 upsides.Described deflector 8 adopts step distributed architecture, and this deflector has towards reduce gradually the ledge structure of height away from described dust removing body air inlet 6 directions; Due to the existence of pressure reduction difference and flow resistance, hot blast, in pipeline enters dust removing body, must guarantee that each Whirlwind cyclone air inlet is balanced through shunting, just can guarantee that each dedusting Whirlwind cyclone of equal column distribution reaches reasonable, balanced dust removing effects.Dust arrester adopts the design of interior step formula deflector, makes to obtain larger admission space near the Whirlwind cyclone of air inlet, with the less fluid ability of this place's hot blast of this balance.
Ash bucket 3 is arranged on the downside of described dust removing body 1, is connected with described Whirlwind cyclone outlet at bottom 72, for collecting dust, and dust is imported to bulk cement storage tank 5.
In the present embodiment, dust removing body 1 is arranged on fixed support 4, adopts control system on the spot, can meet on-the-spot installation requirement, easy access and operation.
Wherein, the bottom of described a plurality of dedusting Whirlwind cyclones adopts inverted cone-shaped structure 71, more conveniently be connected with bottom ash bucket 3, and this each Whirlwind cyclone outlet at bottom 72 is isolated mutually, and, can between a plurality of dedusting Whirlwind cyclones, be filled with filler 14, as vermiculite power, thereby guarantee each dedusting Whirlwind cyclone independence dedusting, air-flow is not harassed mutually, and then efficiency of dust collection is improved.
Further, described dedusting Whirlwind cyclone 7 is provided with screw type flow deflector 12 in Whirlwind cyclone air inlet 11 positions.The present embodiment, the quantity of the screw type flow deflector 12 preferably adopting is four, and the angle of the axial formation of described each screw type flow deflector and described dedusting Whirlwind cyclone is 25～30 degree.The flue gas that enters Whirlwind cyclone will be in mode under screw along inwall High Rotation Speed, and cross section flow control is between 3.5～4.75m/s, and the centrifugal force acting on smoke particle is the decades of times of gravity, even more.
Consider that in dedusting Whirlwind cyclone, high velocity air also will carry the trickle particle of part, especially, in dedusting Whirlwind cyclone, stream swirl district is provided with three floor taper screen rings 13, this inertia taper screen ring 13 is fixedly connected on to the air inlet position, bottom of dedusting Whirlwind cyclone inner core tube 10.Utilize inertia taper screen ring to carry out secondary dedusting to fine particle, when fine dusts flows near core pipe, because inertia force effect collision is on taper screen ring, transient energy reduces, with air-flow, rebound around Whirlwind cyclone cone barrel, with down current, fall into ash bucket, efficiency of dust collection is further improved.
Described dedusting Whirlwind cyclone adopts cast iron or pottery to make, more than thickness can be arranged on 6mm, thereby guarantee that dedusting Whirlwind cyclone has good wearability and dust removal performance, and wall thickness is more than 6mm, in the time of also avoiding hot-blast pressure sudden change there is distortion, the phenomenon of breaking in dedusting Whirlwind cyclone.
Dilution wind steam air heater uses the auxiliary header steam of boiler as thermal source, pyrolysis oven is diluted to wind and by environment temperature, be increased to 145 ℃, and dilution wind steam air heater design steam consumption is 0.1t/h.After the hot primary system of denitration pyrolysis oven dilution risk investment fortune stove, pyrolysis oven will no longer consume steam, calculate according to this, monthly can consume 72 tons by steam saving, can approximately 0.64 ten thousand yuan of steam saving cost (by 90 yuan/ton of steam).Because my company's denitration steam air heater is hydrophobic, be not directly recovered to therrmodynamic system recycling, after stoppage in transit denitration steam air heater, can receive the energy-saving effect that reduces unit make-up water percentage and department of chemistry's controlling water consumption.
Embodiment bis-
As shown in Figure 3, the method that the present embodiment provides the dust arrester described in a kind of embodiment of utilization mono-to carry out the dedusting of denitration hot blast, the method for this hot blast dedusting specifically comprises the following steps:
S1 enters hot blast in dust removing body by dust removing body air inlet, and the deflector that the step in this dust removing body distributes carries out gas distribution, thereby make hot blast shunting and corresponding inflow is arranged on each the dedusting Whirlwind cyclone in described deduster, make dedusting Whirlwind cyclone near described dust removing body air inlet than the larger admission space of other dedusting Whirlwind cyclone acquisition;
Due to the existence of hot blast pressure reduction difference and flow resistance, hot blast, in pipeline enters dust removing body, must guarantee that each Whirlwind cyclone air inlet is balanced through shunting, just can guarantee that each dedusting Whirlwind cyclone of equal column distribution reaches reasonable, balanced dust removing effects.Dust removing body adopts the design of interior step formula distribution guide plate, make to obtain larger admission space near the Whirlwind cyclone of dust removing body air inlet, with this balance this near the less fluid ability in dust removing body air inlet place.
Described in S2, dedusting Whirlwind cyclone carries out dust removal process to hot blast, and adopts ash bucket to collect dust, then by Whirlwind cyclone gas outlet, hot blast is discharged;
Described step S2 carries out dust removal process to hot blast, specifically comprises the following steps:
S21 carries out water conservancy diversion by being arranged on a plurality of screw type flow deflectors of Whirlwind cyclone air inlet to hot blast, for example, adopt four screw type flow deflectors to make hot blast along the inwall of dedusting Whirlwind cyclone, be rotated down and move in a spiral manner.The cross section flow control of hot blast is between 3.5～4.75m/s, and the centrifugal force acting on smoke particle is the decades of times of gravity, even more.The centrifugal force that hot blast produces in strong rotary course can the soot dust granule much larger than gas get rid of density to Whirlwind cyclone inwall, once grit and inwall contact-impact, just lose inertia force and fall to entering ash bucket by the momentum of entrance velocity and the gravity of self along Whirlwind cyclone internal face;
Described in S22, rotate descending hot blast through under the bottom inverted cone-shaped structure effect of described dedusting Whirlwind cyclone, along axial line, upwards turn back, form the interior rotational gas flow rising, via Whirlwind cyclone gas outlet, discharge.
Before described in S23, hot blast is discharged by Whirlwind cyclone gas outlet, separated to the fine particle in hot blast through inertia taper screen ring in stream swirl district, carry out secondary dust removal process.Hot blast is after above-mentioned separated dedusting, the high velocity air of considering hot blast also will carry the trickle particle of part, in stream swirl district, be provided with especially inertia taper screen ring, for example three layers of inertia taper screen ring, carry out secondary trapping to fine particle, when fine dusts flows near core pipe, because inertia force effect collision is on taper screen ring, transient energy reduces, and with air-flow, rebounds around Whirlwind cyclone cone barrel, with down current, fall into ash bucket, efficiency of dust collection is further improved.
S3 hot blast enters pyrolysis chamber after discharging by described dust removing body gas outlet.
The efficiency of dust collection of the denitration hot blast dust collection method that the present embodiment provides is more than 85%, and dust arrester body resistance is lower than 900Pa, and air quantity meets pyrolysis oven burning condition and good flow distribution evenness.
Above embodiment is only for illustrating the utility model; and be not limitation of the utility model; the those of ordinary skill in relevant technologies field; in the situation that not departing from spirit and scope of the present utility model; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present utility model, and scope of patent protection of the present utility model should be defined by the claims.
Claims (5)
1. a denitration hot air dust removing device, is characterized in that, comprises
Dust removing body, described dust removing body is provided with dust removing body air inlet and dust removing body gas outlet;
A plurality of dedusting Whirlwind cyclones, are arranged in described dust removing body;
Deflector, described deflector is arranged in described dust removing body, and is placed in described dedusting Whirlwind cyclone top; Described deflector adopts step distributed architecture, and this deflector has towards reducing gradually attach structure away from described dust removing body air inlet direction, between a plurality of dedusting Whirlwind cyclones, is filled with filler;
Ash bucket, is arranged on the downside of described dust removing body, for collecting dust;
Described dedusting Whirlwind cyclone inside is provided with taper screen ring in stream swirl district.
2. denitration hot air dust removing device according to claim 1, is characterized in that, the bottom of described a plurality of dedusting Whirlwind cyclones adopts inverted cone-shaped structure, and the outlet at bottom of this each dedusting Whirlwind cyclone is isolated mutually.
3. denitration hot air dust removing device according to claim 2, is characterized in that, the air inlet of described dedusting Whirlwind cyclone is provided with screw type flow deflector.
4. denitration hot air dust removing device according to claim 3, is characterized in that, the quantity of described screw type flow deflector is four, and the angle of the axial formation of described each screw type flow deflector and described dedusting Whirlwind cyclone is 25～30 degree.
5. denitration hot air dust removing device according to claim 1, is characterized in that, described dedusting Whirlwind cyclone adopts cast iron or pottery to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320792168.1U CN203777817U (en) | 2013-12-04 | 2013-12-04 | Hot-air dust removing device for denitration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320792168.1U CN203777817U (en) | 2013-12-04 | 2013-12-04 | Hot-air dust removing device for denitration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203777817U true CN203777817U (en) | 2014-08-20 |
Family
ID=51314048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320792168.1U Expired - Lifetime CN203777817U (en) | 2013-12-04 | 2013-12-04 | Hot-air dust removing device for denitration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203777817U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105817102A (en) * | 2016-04-15 | 2016-08-03 | 天津大学 | Purification device suitable for removing fine particulate matters |
| CN113617783A (en) * | 2021-08-23 | 2021-11-09 | 北京京能电力股份有限公司 | Dust suppression device and dust suppression method for power plant construction |
-
2013
- 2013-12-04 CN CN201320792168.1U patent/CN203777817U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105817102A (en) * | 2016-04-15 | 2016-08-03 | 天津大学 | Purification device suitable for removing fine particulate matters |
| CN113617783A (en) * | 2021-08-23 | 2021-11-09 | 北京京能电力股份有限公司 | Dust suppression device and dust suppression method for power plant construction |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181221 Address after: 072750 No. 45 Jingnan Street, Changdian Village, Dongxianpo Town, Zhuozhou City, Baoding City, Hebei Province Patentee after: HEBEI ZHUOZHOU JINGYUAN THERMAL ELECTRICITY Co.,Ltd. Address before: 100041 No. 10 Guangning Road, Shijingshan District, Beijing Patentee before: SHIJINGSHAN THERMAL POWER PLANT OF BEIJING JINGNENG POWER CO.,LTD. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140820 |