CN202962254U - Device for purifying harmful substances in smoke generated during boiler combustion - Google Patents
Device for purifying harmful substances in smoke generated during boiler combustion Download PDFInfo
- Publication number
- CN202962254U CN202962254U CN201220631293XU CN201220631293U CN202962254U CN 202962254 U CN202962254 U CN 202962254U CN 201220631293X U CN201220631293X U CN 201220631293XU CN 201220631293 U CN201220631293 U CN 201220631293U CN 202962254 U CN202962254 U CN 202962254U
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- packed tower
- flue gas
- smoke
- harmful substance
- cleaning solution
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Treating Waste Gases (AREA)
Abstract
The utility model relates to a boiler purification technique and particularly relates to a device for purifying harmful substances in smoke generated during boiler combustion. The device comprises a packed tower and a smoke pretreatment device; the smoke pretreatment device is arranged at the lower side at the outer part of the packed tower and communicated with the packed tower; the packed tower is sequentially provided with a packing layer and a dewatering layer from bottom to top; a liquid spraying device is arranged above the packing layer; the upper end of the packed tower is provided with a smoke outlet, and the lower end of the packed tower is provided with a water outlet; after passing through the smoke pretreatment device, smoke generated during boiler combustion enters the lower part of the packed tower and is in contact with a cleaning solution which is sprayed out by the liquid spraying device and permeates the packing layer so that large-particle substances in the smoke enter the cleaning solution after being settled; the harmful substances in the smoke are in contact with the cleaning solution so as to be subjected to catalytic oxidation and absorbed; and the purified smoke is dewatered after passing through the dewatering layer and is discharged from the smoke outlet at the upper end of the packed tower. Sulfur dioxide is removed without adding medicines, and effective components in the smoke can be directly used for neutralizing and treating harmful gases in the smoke, so that a great number of operation costs and expenses can be reduced.
Description
Technical field
The utility model relates to the boiler purification techniques, and a kind of purification boiler burning specifically produces the device of harmful substances from flue gases.
Background technology
In the face of natural calamity takes place frequently, climate warming etc., environment way and effect control measures are all improved trying every possible means to seek in the whole world, reduce CO as far as possible
2, SO
2, NO
XDeng noxious gas emission.Sulfur dioxide (the SO that is administering boiler and discharge in China and even the whole world
2), nitrogen oxide (NO
x) the longest method of seeing dust treatment mode commonly used is divided into two kinds, namely most of flying dust grit is processed separately by multi-tube dust cleaner, electric cleaner, sack cleaner etc.SO
2, NO
xTo utilize the liquid scrubbing mode to absorb.
Administer SO
2: adopt in alkali and theory, the desulfurizing agent of use mainly contains NaOH (NaHO) calcium oxide (GaO) or magnesia (MgO).The manufacturing enterprise of well-known NaHO, GaO, MgO is all the big power consumer, also all is put into all the time environmental pollution emphasis source.The dust pollution that brings in its production process is very serious.
For example: desulfurizing agent GaO is by GaCO
3Heating (fire coal) calcining, GaCO
3Calcination process can discharge a large amount of CO2.According to investigations, be energy-saving furnace even produce the stove of GaO, one ton of GaO of every production still needs to consume minimum 100 kilograms of mark coal, one ton of GaO of average every production, I haven't seen you for ages produces 1.5 tons of CO
2Greenhouse gases.
Chemical equation: GaCO
3-→ GaO+CO
2
Theoretical calculating: one ton of SO of every processing
2, needs use the GaO of 1.5 ton of 80% purity; That is to say and process one ton of SO
2Will discharge 2.25 tons of CO
2In addition, calculate according to theory, limestone-gypsum method is removing SO in sweetening process
2Gas also will give off CO simultaneously
2Gas often removes 1 ton of SO in theory
2Give off 0.72 ton of CO
2In fact be exactly with many discharging CO
2Exchange for and reduce discharging SO
2
Adopting during GaO or MgO do the desulfurizing agent process, the consumption of MgO is to have lacked some in theory, even but abounding with MgO Liaoning or Shandong District, actual purchase cost price does not reduce.The CO that the calcination process of same MgO discharges
2More.
Although lime stone---gypsum is to alleviating SO
2Certain effect has been played in pollution, but the byproduct that produces---desulfurated plaster contains a large amount of impurity, compression strength, tensile strength etc. all can't be compared with the plaster of paris, desulfurated plaster does not possess the advantage of competition for the plaster of paris, and desulfurated plaster is mainly used in the cement buffer, but only can mix approximately 5% in manufacture of cement, and still contain 10% adhesive water in desulfurated plaster, the value of recycling is little.
To control SO although burn low-sulfur coal
2The effective way of discharging, colliery also drop into great amount of cost for reducing raw coal sulfur-bearing composition on coal cleaning process, the actual effect that brings the user is that the procurement price of fuel increases.
Up to the present, the NO that all discharges in inquiring into how with scientific and effective method improvement boiler combustion process of global scientist
x, and therefore produced Technology of Circulating Fluidized Bed Boiler etc.But only rely on low-temperature burning can not suppress NO
xDischarging.
Administer NO
XThe time to use at present maximum be to adopt ammoniacal liquor (NH
3) denitrogenation, that is:
NO+NH
3-→N
2↑+H
2O
NH
3Preparation method: ammonia synthesizing industry is the big power consumer in the Chinese national economy pillar industry, in the energy strategy of national Eleventh Five-Year Plan, is also bearing huge energy-saving and emission-reduction pressure, is faced with arduous consumption reduction reduction of income task.The minimum enterprise of industry energy consumption---Jincheng Coal Industry Group condition of production statistics, wherein the anthracite 1180kg/t (NH that consumes in kind
3)), comprehensive power consumption 1280 degree/t (NH
3).
According to calculating, one ton of ammoniacal liquor of every production needs discharging about 8---11 tons of CO
2
Also do not discharge CO to using people more
2Exchange few row SO for
2, NO
xPros and cons make abundant analysis before, if for reduce the discharging SO
2, NO
xWill be with many discharging CO
2Exchange for, whether credible.
And with flying dust---metal oxide is as the source of " alkali ", reduce the quantity of desulphurization system required " alkali " in service, can greatly reduce use in service " alkalescence---medicament " expense cost, can obviously reduce simultaneously because adopting other to add alkalescence---the waste discharge amount that the medicament desulfurization increases.
The utility model content
For the problems referred to above, the purpose of this utility model is to provide a kind of purification boiler burning to produce the device of the harmful substance in flue gas.This device removes sulfur dioxide and need not dosing, can directly utilize the active ingredient in flue dust, and pernicious gas in the neutralisation treatment flue dust can be saved a large amount of operating cost and expense.
For achieving the above object, the technical solution used in the present invention is:
a kind of purification boiler burning produces the device of the harmful substance in flue gas, comprise packed tower and Flue Gas Pretreatment Device, Flue Gas Pretreatment Device is arranged at the outside of packed tower, and be communicated with the bottom of packed tower, be provided with successively from bottom to up packing layer in described packed tower, liquid-jet device and dehydration layer, the upper end of described packed tower is provided with exhanst gas outlet, the lower end is provided with discharge outlet, the flue gas that boiler combustion produces is through entering the bottom of packed tower after Flue Gas Pretreatment Device, and contact with the cleaning solution that sees through packing layer that is sprayed by liquid-jet device, make that in flue dust, the large particulate matter sedimentation enters in cleaning solution, harmful substance in flue dust and the complexing of cleaning solution catalytic oxidation are absorbed, after flue gas after purification passes dehydration pull-up water, exhanst gas outlet discharge from the packed tower upper end.
Described packing layer adopts the contact area that reduces pernicious gas in cleaning solution and flue dust and Raschig ring, polyhedron empty ball or the Pall ring of liquid/gas ratio.
Described dehydration layer is the venetian blind type dividing plate.Described venetian blind type dividing plate adopts corrosion resistant plate to make.The top of described dehydration layer is provided with the water injector for the cleaning and dewatering layer.Described water injector comprises a plurality of shower nozzles, and water injector is connected with the technique water tank that is arranged at the packed tower outside by flush water pump.The packed tower wall of described dehydration layer top is provided with the pressure difference transmitter of controlling pressure reduction in packed tower.
Described liquid-jet device comprises a plurality of shower nozzles, and liquid-jet device is connected with the depositing reservoir that is arranged at the packed tower outside by water circulating pump.
The discharge outlet of described packed tower lower end is connected with the sedimentation basin that is arranged at the packed tower outside by pipeline, and the upper end of described sedimentation basin is communicated with the upper end of depositing reservoir, makes cleaning solution recycling.
Be provided with the pH on-line monitoring instrument by just starting drive control of system in described depositing reservoir.
Advantage of the present utility model and beneficial effect are:
1. the utility model sulfur method need not dosing, directly utilizes the active ingredient of flue dust neutral and alkali metal oxide, neutralisation treatment harmful dust and gas---sulfur dioxide and nitrogen oxide.Can save a large amount of operating cost and expense.
The utility model be controlled at specific pH value＜6 scopes in operation, liquid-gas neutralization reaction speed is fast, liquid/gas is than obviously being less than other wet desulphurization mode 1/3, circulatory system operation power consumption is few.
3. the utility model circulation fluid circular flow, the waste residue sinking speed of discharging is fast, Ash Water Separator is easy, and is namely precipitable in the common 30-40 of lime-ash minute.
4. the utility model circulating fluid exists without supersaturation, removed because of produce the precipitation such as calcium sulfate to boiler result in blockage, the situation such as crystallization, improve and guaranteed security.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Wherein: 1 is Flue Gas Pretreatment Device, and 2 is packing layer, and 3 are the dehydration layer, and 4 is exhanst gas outlet, 5 is water circulating pump, and 6 is sedimentation basin, and 7 is the PH on-line monitoring, and 8 is just starting drive of system, 9 is flush water pump, and 10 is the technique water tank, and 11 is pressure difference transmitter, and 12 is depositing reservoir.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
as shown in Figure 1, the utility model comprises packed tower and Flue Gas Pretreatment Device 1, Flue Gas Pretreatment Device 1 is arranged at the outer lower side of packed tower, and be communicated with packed tower, be provided with successively from bottom to up packing layer 2 and dehydration layer 3 in described packed tower, the top of described packing layer 2 and dehydration layer 3 is respectively equipped with liquid-jet device and water injector, the upper end of described packed tower is provided with exhanst gas outlet 4, the lower end is provided with discharge outlet, the flue gas that boiler combustion produces is through entering the bottom of packed tower after Flue Gas Pretreatment Device 1, and contact with the cleaning solution that sees through packing layer 2 that is sprayed by liquid-jet device, make that in flue dust, the large particulate matter sedimentation enters in cleaning solution, harmful substance in flue dust and the complexing of cleaning solution catalytic oxidation are absorbed, flue gas after purification passes 3 dehydration of dehydration layer, exhanst gas outlet 4 discharges from the packed tower upper end.Flue Gas Pretreatment Device 1 is prior art, flue gas cool-down after the flue gas pretreatment, and flue dust is invaded profit, guarantees that purifying column purifies the reflection effect, and flue-gas temperature is lower usually, and clean-up effect is better; Can effectively reduce the purifying column height.The material selection stainless steel of Flue Gas Pretreatment Device 1 or carbon steel liner glass cermaic plate.
Packing layer 2 adopts Raschig ring, polyhedron empty ball or Pall ring, reduces the contact area of pernicious gas in cleaning solution and flue dust, reduces the liquid/gas ratio.
Described liquid-jet device is connected with the depositing reservoir 12 that is arranged at the packed tower outside by water circulating pump 5.The discharge outlet of described packed tower lower end is connected with the sedimentation basin 6 that is arranged at the packed tower outside by pipeline, and the upper end of sedimentation basin 6 is communicated with the upper end of depositing reservoir 12, makes cleaning solution recycling.Be provided with the pH on-line monitoring instrument 7 by just starting drive 8 controls of system in depositing reservoir 12, system just starting drive 8 is prior art.When system temporarily can not satisfy the environmental emission standard requirement, must pass through control device, and by adding chemical composition, neutralization reaction effect and fume emission be met the demands.Along with systemic circulation increases running time, active ingredient after system stable operation, is cancelled outer adding medicine also in continuous increase, still can guarantee system's service requirement.
The venetian blind type dividing plate of dehydration layer 3 for adopting corrosion resistant plate to make, utilize the moisture grit gas of moving linearly when running into the venetian blind type dividing plate, touch the building, change sharply occurs in the direction of motion of air-flow, water in grit just breaks away from air-flow and is separated, and the gas that is purified is discharged after reef it in.
Described water injector is connected with the technique water tank 10 that is arranged at the packed tower outside by flush water pump 9, is used for the cleaning to dehydration layer 3.The packed tower wall of dehydration layer 3 top is provided with the pressure difference transmitter 11 of controlling pressure reduction in packed tower, and pressure difference transmitter 11 can change according to system pressure difference and start the cleaning shower nozzle, under the prerequisite that guarantees dehydrating effect, makes security of system, reliability service.
Described liquid-jet device and water injector form by a plurality of shower nozzles.
Embodiment 1
The process of the utility model smoke treatment is: enter in Flue Gas Pretreatment Device 1, carry out pretreatment (speed-raising, cooling) through the flue gas that carries out producing after the boiler combustion of primary dust removing, the bottom that then enters packed tower is washed by circulation fluid and is purified, carry out the flue gas dehumidification by dehydration layer 3, enter at last atmosphere.
Concrete purification process:
Be arranged on 15 tons of CFBBs in Guizhou Province, sulfur content in fuel 5.75%.
The flue gas that boiler combustion produces is through Flue Gas Pretreatment Device 1, enter again after making flue gas prewet, lower the temperature in packed tower and contact with the circulating cleaning solution that enters in packed tower through packing layer 2, make large particulate matter in flue dust, comprise the metal oxides such as " iron " that is rich in flue dust after high sulfur coal combustion together sedimentation enter in the cleaning solution that circulation pumps into.In flue dust, harmful substance has the cleaning solution that in flue dust, the circulation of large particulate matter pumps into to contact the large particulate matter oxidation complexation absorption that makes harmful substance sulphur, nitrogen and sedimentation with sedimentation, make gas cleaning, after purifying, flue gas is through dehydration layer 3 dehumidification of packed tower, and then gas is from exhanst gas outlet 4 discharges on packed tower top.
The cleaning solution that circulation pumps into is that the clear water in depositing reservoir 12 pumps in packed tower by water circulating pump 5, the interior pH of depositing reservoir 12 is regulated and controled by the pH on-line monitoring 7 of just starting drive 8 controls of system, the cleaning solution waste liquid that pumps into of circulation flows in sedimentation basin 6 by the discharge outlet of tower in addition, and the cleaning of dehydration layer 3 is the fresh water (FW) in external technique water tank 10 is pumped into by flush water pump 9 and rinse by pressure reduction in pressure difference transmitter 11 control towers simultaneously.
In the cleaning solution that the packing layer 2 reduction circulations that arrange in described packed tower pump into and flue dust, the contact area of harmful substance, reduce the liquid/gas ratio.
After processing through flue gas of the present invention, the sulfur dioxide measured concentration in flue gas is by 3260mg/m
3, be reduced to 858mg/m
3, dust concentration is by 2163mg/m
3Be reduced to 190mg/m
3, satisfied the requirement of environmental protection relevant criterion, the environmental protection relevant criterion namely, dust concentration 200mg/m
3, sulfur dioxide concentration 900mg/m
3Relevant
Embodiment 2
Take Shenyang Thermal Power Plant's lime-ash as example, grey slag ingredient is referring to table 1
The flue gas that boiler combustion produces is through Flue Gas Pretreatment Device 1, enter again after making flue gas prewet, lower the temperature in packed tower and contact with the circulating cleaning solution that enters in packed tower through packing layer 2, make large particulate matter in flue dust, comprise the metal oxides such as " iron " that is rich in flue dust after high sulfur coal combustion together sedimentation enter in the cleaning solution that circulation pumps into.In flue dust, harmful substance has the cleaning solution that in flue dust, the circulation of large particulate matter pumps into to contact the large particulate matter oxidation complexation absorption that makes harmful substance sulphur, nitrogen and sedimentation with sedimentation, make gas cleaning, after purifying, flue gas is through dehydration layer 3 dehumidification of packed tower, and then gas is from exhanst gas outlet 4 discharges on packed tower top.
The cleaning solution that pumps into due to circulation is that acidic circulation liquid can make the metal oxide in flue dust soluble in water.As: the Fe in ash content
2O
3When meeting with the acidic circulation cleaning solution in packed tower, chemical reaction occurs in both, can generate ferrous sulfate and ferrous sulfite.These ferrous ions can in the NO combination that is insoluble in water, become nitroso ferrous sulfite (Fe (NO) SO after running into nitrogen oxide in flue gas
3), under the effect of iron ion, shift rapidly the O atom in NO, locate to make the N atom free, return to meteorology and become nitrogen; Oxygen atom is transferred to rapidly inferior sulfate radical, makes it to become stable sulfate radical.Reach the purpose that purifies sulfur dioxide and nitrogen oxide, the lime-ash of steam power plant has satisfied dust concentration 200mg/m after processing through the utility model flue gas
3, sulfur dioxide concentration 900mg/m
3Relevant environmental protection standard requirement.
Table 1
| Composition | Content (%) | Composition | Content (%) | Composition | Content (%) |
| SiO 2 | 49.75 | Al 2O 3 | 20.98 | CaO | 4.23 |
| Fe 2O 3 | 6.46 | MgO | 1.34 | K 2O | 1.82 |
| Na 2O | 0.49 | TiO 2 | 0.92 | P 2O 5 | 0.64 |
| SO 3 | 3.08 |
Claims (10)
1. a purification boiler burns and produces the device of the harmful substance in flue gas, it is characterized in that: comprise packed tower and Flue Gas Pretreatment Device (1), Flue Gas Pretreatment Device (1) is arranged at the outside of packed tower, and be communicated with the bottom of packed tower, be provided with successively from bottom to up packing layer (2) in described packed tower, liquid-jet device and dehydration layer (3), the upper end of described packed tower is provided with exhanst gas outlet (4), the lower end is provided with discharge outlet, enter the bottom of packed tower after the flue gas process Flue Gas Pretreatment Device (1) that boiler combustion produces, and contact with the cleaning solution that sees through packing layer (2) that is sprayed by liquid-jet device, make that in flue dust, the large particulate matter sedimentation enters in cleaning solution, harmful substance in flue dust and the complexing of cleaning solution catalytic oxidation are absorbed, after flue gas after purification passes dehydration layer (3) dehydration, discharge from the exhanst gas outlet (4) of packed tower upper end.
2. produce the device of the harmful substance in flue gas by purification boiler claimed in claim 1 burning, it is characterized in that: described packing layer (2) adopts the contact area that reduces pernicious gas in cleaning solution and flue dust and Raschig ring, polyhedron empty ball or the Pall ring of liquid/gas ratio.
3. produce the device of the harmful substance in flue gas by purification boiler burning claimed in claim 1, it is characterized in that: described dehydration layer (3) is the venetian blind type dividing plate.
4. produce the device of the harmful substance in flue gas by purification boiler burning claimed in claim 3, it is characterized in that: described venetian blind type dividing plate adopts corrosion resistant plate to make.
5. produce the device of the harmful substance in flue gas by the described purification boiler burning of claim 1 or 3, it is characterized in that: the top of described dehydration layer (3) is provided with the water injector for the cleaning and dewatering layer.
6. produce the device of the harmful substance in flue gas by purification boiler burning claimed in claim 5, it is characterized in that: described water injector comprises a plurality of shower nozzles, and water injector is connected with the technique water tank (10) that is arranged at the packed tower outside by flush water pump (9).
7. produce the device of the harmful substance in flue gas by purification boiler burning claimed in claim 5, it is characterized in that: the described layer packed tower wall of (3) top that dewater is provided with the pressure difference transmitter (11) of controlling pressure reduction in packed tower.
8. produce the device of the harmful substance in flue gas by purification boiler burning claimed in claim 1, it is characterized in that: described liquid-jet device comprises a plurality of shower nozzles, and liquid-jet device is connected with the depositing reservoir that is arranged at the packed tower outside (12) by water circulating pump (5).
9. produce the device of the harmful substance in flue gas by purification boiler burning claimed in claim 8, it is characterized in that: the discharge outlet of described packed tower lower end is connected with the sedimentation basin that is arranged at the packed tower outside (6) by pipeline, the upper end of described sedimentation basin (6) is communicated with the upper end of depositing reservoir (12), makes cleaning solution recycling.
10. produce the device of the harmful substance in flue gas by the described purification boiler burning of claim 8 or 9, it is characterized in that: be provided with the pH on-line monitoring instrument (7) by just starting drive (8) control of system in described depositing reservoir (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220631293XU CN202962254U (en) | 2012-11-26 | 2012-11-26 | Device for purifying harmful substances in smoke generated during boiler combustion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220631293XU CN202962254U (en) | 2012-11-26 | 2012-11-26 | Device for purifying harmful substances in smoke generated during boiler combustion |
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| Publication Number | Publication Date |
|---|---|
| CN202962254U true CN202962254U (en) | 2013-06-05 |
Family
ID=48503385
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|---|---|---|---|
| CN201220631293XU Expired - Fee Related CN202962254U (en) | 2012-11-26 | 2012-11-26 | Device for purifying harmful substances in smoke generated during boiler combustion |
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|---|---|
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106807156A (en) * | 2017-03-20 | 2017-06-09 | 李宏江 | Thermal power generation smoke evacuation purifying energy-saving device |
| CN107261679A (en) * | 2017-07-31 | 2017-10-20 | 苏州他山石环保科技有限公司 | A kind of intelligent waste gas treatment equipment and its method of work |
| CN107297105A (en) * | 2017-07-31 | 2017-10-27 | 苏州他山石环保科技有限公司 | A kind of intelligent waste gas treatment equipment of efficient facilitation and its method of work |
| CN108993123A (en) * | 2018-09-07 | 2018-12-14 | 佛山市禅城区诺高环保科技有限公司 | A kind of chemical industry tail gas purification absorption plant and its application method |
| CN111228933A (en) * | 2020-02-26 | 2020-06-05 | 深圳市和科达超声设备有限公司 | Laser cutting dust collector |
-
2012
- 2012-11-26 CN CN201220631293XU patent/CN202962254U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106807156A (en) * | 2017-03-20 | 2017-06-09 | 李宏江 | Thermal power generation smoke evacuation purifying energy-saving device |
| CN107261679A (en) * | 2017-07-31 | 2017-10-20 | 苏州他山石环保科技有限公司 | A kind of intelligent waste gas treatment equipment and its method of work |
| CN107297105A (en) * | 2017-07-31 | 2017-10-27 | 苏州他山石环保科技有限公司 | A kind of intelligent waste gas treatment equipment of efficient facilitation and its method of work |
| CN108993123A (en) * | 2018-09-07 | 2018-12-14 | 佛山市禅城区诺高环保科技有限公司 | A kind of chemical industry tail gas purification absorption plant and its application method |
| CN111228933A (en) * | 2020-02-26 | 2020-06-05 | 深圳市和科达超声设备有限公司 | Laser cutting dust collector |
| CN111228933B (en) * | 2020-02-26 | 2021-02-23 | 深圳市和科达超声设备有限公司 | Laser cutting dust collector |
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Granted publication date: 20130605 Termination date: 20151126 |