CN104874269B - System and method for synchronous implementation of online monitoring of mercury content in flue gas and mercury removal - Google Patents
System and method for synchronous implementation of online monitoring of mercury content in flue gas and mercury removal Download PDFInfo
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- CN104874269B CN104874269B CN201510285900.XA CN201510285900A CN104874269B CN 104874269 B CN104874269 B CN 104874269B CN 201510285900 A CN201510285900 A CN 201510285900A CN 104874269 B CN104874269 B CN 104874269B
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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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- 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
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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Abstract
The present invention relates to the corollary system of boiler of power plant, specially a kind of synchronous system for realizing on-line monitoring flue gas mercury content and demercuration, on-line monitoring and flue gas mercury removal two parts including mercury in flue gas content. The on-line monitoring system of mercury includes sampling unit, delivery unit, reduction unit, five part of analytical unit and data processing unit. The demercuration part includes demercuration component after stokehold demercuration component and furnace. Hg0 more in flue gas are oxidized to Hg2+ as far as possible, Hg2+ is immersed in flying dust aperture by spraying device and is converted to particle mercury
, to be trapped by bag filter. The present invention has rational design, which effectively removes the harmful element mercury carried in flue gas in boiler of power plant, mitigates atmosphere pollution, achieves good social benefit.
Description
Technical field
The present invention relates to the corollary system of CFBB, specially one kind are applied to CFBB flue gas
The synchronous system and method realizing on-line monitoring flue gas mercury content and demercuration in process.
Background technology
During the use of CFBB, fuel coal dust and for desulfurization agstone mixing after enter coal
Storehouse, enters burner hearth by Scraper, and the flue gas after burning enters flue after cyclone separator, is then passed through air pre-
Hot device utilizes a part of waste heat of waste gas, enters back-end ductwork, finally enters chimney and enter in air in the presence of air-introduced machine.
Although the element sulphur in flue gas is substantially completely removed substantially, mercury in flue gas element but enters in air with waste gas, causes ring
Border is polluted, thus, it is necessary to remove the hydrargyrum in waste gas further, and then works out a set of demercuration system being exclusively used in boiler of power plant
System.
Content of the invention
The present invention is in order to solve the problems, such as current CFBB mercury in flue gas content overproof, there is provided a kind of synchronous
The method realizing on-line monitoring flue gas mercury content and demercuration.
The present invention adopts the following technical scheme that realization:
A kind of method that on-line monitoring flue gas mercury content and demercuration are realized in synchronization, comprises the steps:
(1), set up demercuration system
Demercuration system includes stokehold demercuration assembly and furnace rear demercuration assembly；
Described stokehold demercuration assembly includes calcium bromide powder cabin, and described calcium bromide powder cabin is passed through the first pipeline and connected surge bunker,
Manual inserting plate door, the electric flashboard door being controlled by dcs system are sequentially connected on described first pipeline and connect compressed air blowback
Sweep the first three-way valve of pipeline；Described surge bunker passes through the second pipeline and connects batcher, and described second pipeline is sequentially installed with
Hand-operated valve and the second three-way valve connecting the anti-scavenging pipeline of compressed air；Described batcher by elevator by material be delivered to
It is mixed into coal bunker with coal dust on coal belt.
Described furnace rear demercuration assembly includes spray-type humidifier and sack cleaner, and described spray-type humidifier includes high pressure
Water pump, the band in the back-end ductwork that described high-pressure hydraulic pump is connected with after being arranged on air preheater by pipeline and electric control valve
There is the spray gun of atomizer；The import of described sack cleaner connects back-end ductwork, its outlet is connected by air-introduced machine and pipeline
Chimney.
The cooperation-removal process of hydrargyrum in demercuration system:
The removing principle of hydrargyrum: as far as possible by hg more in flue gas0It is oxidized to hg2+, by being humidified, sprayer unit makes hg2+Leaching
Enter and change into particle mercury in flying dust aperture, thus being trapped by sack cleaner.
Collaborative hydrargyrum-removing technology includes two parts: stokehold hydrargyrum-removing technology and furnace rear hydrargyrum-removing technology.
Stokehold hydrargyrum-removing technology is as follows:
a、Oxidation hg0Mechanism as follows:
... ... ... ... ... ... ... (1),
... ... ... ... .... ... .(2),
... ... ... ... ... .... ... (3),
... ... ... ... ... ... ... ... .(4),
... ... ... ... ... ... ... (5).
B, the device of stokehold hydrargyrum-removing technology and flow process
Stokehold hydrargyrum-removing technology device is primarily referred to as calcium bromide powder cabin, surge bunker, batcher and elevator.Bromination calcium powder conveys
System presses the two sets of outfits of every boiler, standby each other.Often the design defeated powder ability of set induction system is not less than 2t/h.Agstone
Induction system is fallen on coal conveyer belt using elevator uniformly continuous, and coal dust is mixed into coal bunker.Calcium bromide powder cabin bottom
Pulverized coal feed pipe is introduced into a surge bunker, and the pulverized coal feed pipe connection of surge bunker bottom is batcher.Normally ran in boiler
Material in powder cabin is passed through pipelined to on coal belt by Cheng Zhong, batcher and elevator, is then mixed into coal dust
Coal bunker, then by Scraper, mixed fuel is sent into the returning charge lower limb of burner hearth, carry out secondary mixing in returning charge lower limb, with height
Warm returning charge enters burner hearth together, improvesUtilization rate, reduces cost.
Furnace rear hydrargyrum-removing technology is as follows:
A, furnace rear hydrargyrum-removing technology include spray-type humidifier and demercuration worked in coordination with by sack cleaner.
Spray humidification principle: after air preheater, sprayer unit sprays at a certain angle flue gas by after desalination water atomization
Enter in flue gas, due to capillarity, when contacting with liquid, liquid can immerse inside flying dust flue gas.The water spraying into is by graininess
StateOrSo as to together be immersed in the flourishing hole of flying dust, there is absorption or absorb, also imply that in dissolving
MoreOrIt is converted into particle mercury it is easy to be trapped by sack cleaner.
Demercuration principle worked in coordination with by sack cleaner: sack cleaner (ff) traps the flying dust in flue gas, thus will adsorb flying
Particle mercury capture on ash.The reason select sack cleaner is that sack cleaner itself more can take off than electric cleaner (esp)
Except tiny particulate matter (more than 0.1um particles trapping effect reaches 99%), secondly, flue gas is remote by the time of ff
Higher than by time of esp, flue gas typically can be up to a few minutes with the time of contact of ff, during the flying dust contact longer with flue gas
Between, promote the absorption to mercury in flue gas for the flying dust；Additionally, gaseous mercury is more or less permeated by filtering medium, a part can be caught
Gaseous mercury.
B, the device of furnace rear hydrargyrum-removing technology and flow process
The device of furnace rear hydrargyrum-removing technology mainly includes spray-type humidifier and sack cleaner.Spray-type humidifier selects peace
It is contained in the back-end ductwork after air preheater, including high-pressure hydraulic pump, the spray gun with atomizer.
Furnace rear hydrargyrum-removing technology flow process: demineralized water squeezes into pipeline by high-pressure hydraulic pump, is divided into four big groups to pipeline, and often big group is divided again
Go out 8 spray guns, 32 spray guns are spaced layered arrangement altogether；Flue gas after air preheater enters in horizontal flue, spray gun
Water droplet after desalination water atomization is uniformly sprayed in whole horizontal flue, the water spraying into is by graininessOrMolten
So as to together be immersed in the flourishing hole of flying dust, there is absorption or absorb in solution,OrIt is converted into particle mercury, cigarette
Gas, after spray-type humidifier, is divided into 4 strands of flue gases and respectively enters 4 dirt pockets, and each clean room layout has 27 cloth bags to remove
Dirt device, for catching particulate form on flying dust for the absorption.
(2), set up the on-line monitoring system of two sets of hydrargyrum
After the on-line monitoring system of a set of hydrargyrum is arranged on air preheater, before spray gun, take off for monitoring furnace rear in advance
Mercury content before hydrargyrum；The on-line monitoring system of another set of hydrargyrum is arranged on chimney afterbody, for monitoring flue gas through controlling removing
Enter the mercury content in air afterwards.
The on-line monitoring system of described hydrargyrum includes sampling unit, delivery unit, reduction unit, the process of analytic unit data
Unit five part.
Described employing unit is connected using the thermodilution probe equipped with fly ash particulate defecator, described thermodilution probe
The anti-scavenging pipeline of compressed air, the compressed air in this anti-scavenging pipeline is controlled by dcs timing.
Described delivery unit is provided with the transport line of heat tracing line using outside, and heat tracing line is always ensured that in transport line
Flue-gas temperature is more than 180 DEG C, prevents the hydrargyrum in flue gas from condensing on pipeline.
Described reduction unit adopts thermocatalytic reduction apparatus, and flue gas is heated to more than 760 DEG C, thus by flue gas
It is completely converted into.
Described analytic unit adopts mercury analyzer.
Described data processing unit adopts dcs system；The control signal of dcs has five tunnels, comprising: control electric flashboard
Door, control the first three-way valve, control the second three-way valve, control batcher, control electric control valve；The feedback signal of dcs has
Five tunnels, comprising: calcium bromide powder storehouse material level feedback, surge bunker material position feedback, gas mercury after batcher speed feedback, air preheater
Content feedback, chimney tail flue gas mercury content feedback.
The on-line monitoring principle of hydrargyrum is sampler sampling flue gas, by heating reduction apparatus by flue gasReduction
Become, and data is passed in real time by data processing unit by mercury analyzer.
The on-line monitoring system of hydrargyrum is typically mounted at chimney afterbody, and analysis and Control equipment can be with other pollutant monitoring controls
Control equipment is placed on a control room, and monitoring flue gas mercury content out isWithSum, does not include particle mercury.
Because flue gas is after sack cleaner, most fly ash granule is trapped by cleaner unit, therefore, finally enters in airSeldom, it is negligible.
The present invention is reasonable in design, and the method effectively removes the harmful element hydrargyrum carrying in flue gas in boiler of power plant, mitigates big
Gas pollutes, and achieves good social benefit.
Brief description
Fig. 1 represents the attachment structure schematic diagram of system of the present invention.
In figure, 101- calcium bromide powder cabin, 102- first pipeline, 103- manual inserting plate door, 104- electric flashboard door, 105-
One three-way valve, 106- surge bunker, 107- second pipeline, 108- second three-way valve, 109- hand-operated valve, 110- batcher, 111- carries
The machine of liter, 112- high-pressure pump, 113- spray gun, 114- electric control valve, 115- sack cleaner, 201- thermodilution probe, 202- transports
Defeated pipeline, 203- heat tracing line, 204- thermal redox device, 205- mercury analyzer, 206-dcs system, 301- coal bunker, 302- stove
Thorax, 303- limestone powder bin, 304- cyclone separator, 305- back-end ductwork, 306- air preheater, 307- chimney, 308- draws
Blower fan.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described in detail.
The system of on-line monitoring flue gas mercury content and demercuration is realized in a kind of synchronization, the on-line monitoring part including hydrargyrum and demercuration
Part.
Described demercuration part includes stokehold demercuration assembly and furnace rear demercuration assembly.
As shown in figure 1, described stokehold demercuration assembly includes calcium bromide powder cabin 101, every boiler is furnished with a dischargeable capacity
For 40m3The calcium bromide powder cabin of steel construction, calcium bromide powder cabin profile top is rounded, bottom is in cone, calcium bromide powder cabin top
Circular internal diameter is 2.5m.The available capacity of calcium bromide powder cabin can store 300mw boiler mcr(maximum successive) 30 under operating mode
The consumption of the bromination calcium powder of hour.Described calcium bromide powder cabin 101 connects surge bunker 106, described first pipe by the first pipeline 102
Manual inserting plate door 103, electric flashboard door 104 and the first threeway connecting the anti-scavenging pipeline of compressed air are sequentially connected on road 102
Valve 105, dcs timing control compressed air carries out blowback through the first three-way valve 105 entrance the first pipeline 105 and sweeps operation, prevents
Only pipeline blockage is it is ensured that blanking is unimpeded.
Bromination calcium powder induction system presses the two sets of outfits of every boiler, standby each other.Often cover the design defeated powder energy of induction system
Power is not less than 2t/h.Agstone induction system is fallen on coal conveyer belt using bucket elevator uniformly continuous, and coal dust is mixed into
Coal bunker.
As shown in figure 1, the pulverized coal feed pipe of calcium bromide powder cabin bottom is introduced into a surge bunker, described surge bunker 106 passes through
Second pipeline 107 connects batcher 110, described second pipeline 107 is provided with hand-operated valve 109 and connection compressed air blowback is swept
Second three-way valve 108 of pipeline, dcs timing controls compressed air to enter the second pipeline 107 through the second three-way valve 108 and carries out
Operation is swept in blowback, prevents pipeline blockage it is ensured that blanking is unimpeded.Calcium bromide powder cabin and surge bunker are respectively provided with a continuous material level
Meter, for real-time detection powder storehouse material level, continuous material level meter is transmitted a signal to dcs system in real time, is easy to control.
As shown in figure 1, the pulverized coal feed pipe connection of surge bunker bottom is batcher.Batcher 110 passes through a standard
Induction conductivity drive change speed gear box and drive, by dcs system control converter be its power, control batcher rotary speed
Controllable feeding coal.Wherein, the accumulation of calcium bromide volume (regulation the) × bromination calcium powder of feeding coal=rotating speed × each rotation is close
Degree × rotating ratio.
As shown in figure 1, material is delivered to by described batcher 110 by elevator 111 mixing with coal dust on coal belt
Enter coal bunker 301.In boiler normal course of operation, material in calcium bromide powder cabin passes through pipelined to on coal belt,
Then it is mixed into coal bunker with coal dust, then by Scraper by the returning charge lower limb of mixed fuel feeding burner hearth, in returning charge lower limb
Carry out secondary mixing, enter burner hearth together with high temperature returning charge, improveUtilization rate.Calcium bromide is as far as possible by flue gas
In more hg0It is oxidized to hg2+, hg is made by sprayer unit2+It is immersed in flying dust aperture and change into particle mercury, from
And trapped by sack cleaner.
As shown in figure 1, described furnace rear demercuration assembly includes spray-type humidifier and sack cleaner 115, described spraying increases
Wet device includes high-pressure hydraulic pump 112, and described high-pressure hydraulic pump 112 passes through pipeline and electric control valve 114 is connected with atomization spray
The spray gun 113 of mouth, spray gun 113 be arranged on air preheater 306 after back-end ductwork 305 in；Electric control valve 114 is by dcs system
System controls, and is mainly used to control to adjust confluent.The import of described sack cleaner 115 connects back-end ductwork 305, its outlet is led to
Cross air-introduced machine 308 and pipeline connects chimney 307.
Demineralized water squeezes into main pipe by high-pressure hydraulic pump, main pipe is carried out with one-to-two, after two point four, and often big group separates 8 sprays again
Rifle, is provided with the preferable atomizing lance of atomizing effect, and every unit amounts to 32 spray guns, and 16 is long, 16 short, interval layered arrangement；
Flue gas after air preheater enters in horizontal flue, and the water droplet after desalination water atomization is uniformly sprayed on whole horizontal flue by spray gun
Interior, the water droplet after atomization sprays in flue gas at a certain angle, and due to capillarity, when contacting with liquid, liquid can soak flue gas
Enter flying dust inside so as to uniformly mix with flue gas flying dust, improve desulfuration demercuration efficiency.The water spraying into is by graininess
OrSo as to together be immersed in the flourishing hole of flying dust, there is absorption or absorb in dissolving, also imply that moreOrIt is converted into particle mercury it is easy to be trapped by sack cleaner.Flue gas, after spray-type humidifier, is divided into 4
Stock flue gas respectively enters 4 dirt pockets, and each clean room layout has 27 sack cleaners, for catching absorption on flying dust
Particulate form.Sack cleaner (ff) traps the flying dust in flue gas, thus the particle mercury capture on flying dust by absorption.Choosing
The reason select sack cleaner is that sack cleaner itself more can remove tiny particulate matter (0.1um than electric cleaner (esp)
Above particles trapping effect reaches 99%), secondly, flue gas will be far above the time by esp, cigarette by the time of ff
Typically can be up to a few minutes the time of contact of gas and ff, flying dust and flue gas longer time of contact, promote flying dust in flue gas
The absorption of hydrargyrum；The gaseous mercury of a part additionally, gaseous mercury is more or less permeated, can be caught by filtering medium.
It is also equipped with metering system, metering system and spray humidification spraying system are private system in spray-type humidifier,
It is all disposed within the horizontal flue of air preheater outlet, metering system mainly adopts the packet on the rear four denominator pipes in two point four of end
Come to measure, every group is individually measured effusion meter, does not interfere with each other, and total emitted dose is four effusion meter emitted dose sums.Every stove increases
Wet activation device per hour water consumption be 7.8t/h, year water consumption be 42900t/y.
The on-line monitoring assembly of hydrargyrum comprises the on-line monitoring equipment of two sets of hydrargyrum, as shown in figure 1, a set of be arranged on air preheat
After device, before spray-type humidifier, for monitoring the mercury content before furnace rear demercuration in advance, such as find that mercury content is too high, then carry
Front spray-type humidifier and calcium bromide batcher are controlled by dcs system.Second set is arranged on chimney afterbody, for monitoring flue gas
The mercury content in air is entered after controlling removing.
As shown in figure 1, often set hydrargyrum on-line monitoring assembly () equal sampling unit, delivery unit, reduction is single
Unit, analytic unit data processing unit five part.
Sampling unit is using the thermodilution probe equipped with fly ash particulate defecator, continuously takes out from flue gas
Take flue gas.Using thermodilution probe be consider flue gas in other gases such as, the impact to hydrargyrum concentration such as water vapour；Flying dust
Particulate matter filter device (as sintered titanium) is to ensure that the flue gas entering in delivery unit is dustless flue gas, in case fly ash particulate blocks up
Plug sampler；Sampler is typically chosen the less sample tap of size, perpendicular to the sampling of flue gas direction of flow, so can subtract
Little fly ash granule enters sampler, improves sampling precision.Described thermodilution probe 201 also connects the anti-scavenging conduit of compressed air
Road, dcs timing control compressed air carries out blowback to probe and sweeps operation, prevents probe blocking it is ensured that sampling is smooth.
Delivery unit adopts attemperating unit, the specifically outside transport line being provided with heat tracing line, is always ensured that in transport
On pipeline, flue-gas temperature is 180 DEG C, and this is to prevent the hydrargyrum in flue gas from condensing on pipeline.
Reduction unit typically adopts thermocatalytic reduction technique, i.e. thermocatalytic reduction apparatus, and in reduction unit, flue gas is added
Heat to 760 DEG C, thus by flue gasIt is completely converted into, because analytic unit can only be analyzed.
Analytic unit adopts mercury analyzer, and mercury analyzer will be corrected before use, and bearing calibration is usually using product
The mercury element gas of raw normal concentration, is passed in mercury analyzer and is corrected.
Data processing unit dcs system, the data that mercury analyzer is provided carries out Treatment Analysis, transfers data in real time
Central station of floating dock and relevant department.
Flue gas enters thermal redox device 204 by transport line 202 after entering thermodilution probe 201 sampling, will adopt
In sample flue gasIt is completely converted intoAfterwards, enter mercury analyzer 205, after obtaining data, input dcs system 206 is processed.
First set on-line monitoring assembly is used for the mercury content before monitoring furnace rear demercuration in advance, such as finds that mercury content is too high, then pass through in advance
Dcs system controls spray-type humidifier and calcium bromide batcher, forms closed loop feedback system.Second set of online monitoring assembly is used for
Monitoring flue gas enters the mercury content in air after controlling removing, such as finds that mercury content is too high, then pass through dcs system in advance
Control spray-type humidifier and calcium bromide batcher, form closed loop feedback system.
The control signal of dcs has five tunnels.Control signal includes: controls electric flashboard door, controls the first three-way valve, control
Second three-way valve, control batcher, control electric control valve.
The feedback signal of dcs has five tunnels.Feedback signal includes: calcium bromide powder storehouse material level feeds back, surge bunker material position is fed back,
Gas mercury content feedback, chimney tail flue gas mercury content feedback after batcher speed feedback, air preheater.
The scope of protection of present invention is not limited to above specific embodiment, to those skilled in the art, this
Invention can have various deformation and a change, all designs in the present invention and any modification made within principle, improvement and be equal to
Replace and all should be included within protection scope of the present invention.
Claims (7)
1. the system of on-line monitoring flue gas mercury content and demercuration is realized in a kind of synchronization, including on-line monitoring part and demercuration part,
It is characterized in that:
Described demercuration part includes stokehold demercuration assembly and furnace rear demercuration assembly；
Described stokehold demercuration assembly includes calcium bromide powder cabin (101), and described calcium bromide powder cabin (101) passes through the first pipeline (102)
Connect surge bunker (106), described surge bunker (106) connects batcher (110), described batcher by the second pipeline (107)
(110) by elevator (111), material is delivered to being mixed into coal bunker (301) on coal belt with coal dust；
Described furnace rear demercuration assembly includes spray-type humidifier and sack cleaner (115), and described spray-type humidifier includes height
Water pump (112), described high-pressure hydraulic pump (112) passes through pipeline and electric control valve (114) is connected with the spray with atomizer
Rifle (113), spray gun (113) be arranged on air preheater (306) after back-end ductwork (305) in, air preheater (306) install
After cyclone separator (304), flue gas is through cyclone separator (304) air inlet preheater (306)；Described sack cleaner
(115) import connects back-end ductwork (305), and its outlet connects chimney (307) by air-introduced machine (308) and pipeline；
Described on-line monitoring part includes the on-line monitoring assembly of first set hydrargyrum, and the on-line monitoring assembly of described first set hydrargyrum includes
Sampling unit, delivery unit, reduction unit, analytic unit data processing unit five part；Wherein sampling unit is installed on cigarette
On chimney (307)；
Described on-line monitoring part also includes the on-line monitoring assembly of second set of hydrargyrum, the on-line monitoring assembly bag of described second set of hydrargyrum
Include sampling unit, delivery unit, reduction unit, analytic unit data processing unit five part；Wherein, sampling unit is installed on
After air preheater (306), before spray gun (113)；
Described sampling unit is using the thermodilution probe (201) equipped with fly ash particulate defecator；Described delivery unit adopts
Outside is provided with the transport line (202) of heat tracing line (203)；Described reduction unit adopts thermocatalytic reduction apparatus (204)；Described
Analytic unit adopts mercury analyzer (205)；Described data processing unit adopts dcs system (206).
2. synchronization according to claim 1 realize on-line monitoring flue gas mercury content and demercuration system it is characterised in that: institute
State thermodilution probe (201) and connect the anti-scavenging pipeline of compressed air.
3. synchronization according to claim 1 realize on-line monitoring flue gas mercury content and demercuration system it is characterised in that: institute
State and manual inserting plate door (103) and electric flashboard door (104) are sequentially connected on the first pipeline (102), described electric flashboard door (104)
Controlled by dcs system (206)；
It is also equipped with described first pipeline (102) connecting first three-way valve (105) of the anti-scavenging pipeline of compressed air；Described
The second three-way valve (108) connecting the anti-scavenging pipeline of compressed air is provided with two pipelines (107).
4. synchronization according to claim 3 realize on-line monitoring flue gas mercury content and demercuration system it is characterised in that: institute
State batcher (110) to be driven by the change speed gear box that induction conductivity drives, described induction conductivity is controlled by dcs system (206) and becomes
Frequency device is powered for it.
5. synchronization according to claim 4 realize on-line monitoring flue gas mercury content and demercuration system it is characterised in that: institute
State calcium bromide powder cabin (101) and surge bunker (106) is respectively provided with continuous material level meter, described continuous material level meter outputs signals to dcs
System (206).
6. synchronization according to claim 5 realize on-line monitoring flue gas mercury content and demercuration system it is characterised in that: cigarette
Gas, after spray-type humidifier, is divided into 4 strands of flue gases and respectively enters 4 dirt pockets, and each clean room layout has 27 cloth bags to remove
Dirt device (115).
7. a kind of synchronization realize on-line monitoring flue gas mercury content and demercuration method it is characterised in that: comprise the steps:
(1), set up demercuration system, described demercuration system includes stokehold demercuration assembly and furnace rear demercuration assembly；
Stokehold demercuration assembly is as follows:
Described stokehold demercuration assembly includes calcium bromide powder cabin (101), and described calcium bromide powder cabin (101) passes through the first pipeline (102)
Connect surge bunker (106), described first pipeline (102) is sequentially connected manual inserting plate door (103), is controlled by dcs system (206)
Electric flashboard door (104) and connect the anti-scavenging pipeline of compressed air the first three-way valve (105)；Described surge bunker (106) is led to
Cross the second pipeline (107) and connect batcher (110), described second pipeline (107) is sequentially installed with hand-operated valve (109) and connects
Second three-way valve (108) of the anti-scavenging pipeline of compressed air；Described batcher (110) is driven by the change speed gear box that induction conductivity drives
Dynamic, described induction conductivity controls converter to power for it by dcs system (206)；Described calcium bromide powder cabin (101) and surge bunker
(106) it is respectively provided with continuous material level meter, described continuous material level meter outputs signals to dcs system (206)；
Material is delivered to on coal belt by elevator (111) by described batcher (110), meanwhile, agstone delivery system
Agstone uniformly continuous are fallen on coal conveyer belt using elevator by system, enter coal after material, agstone and coal dust mixing
Storehouse, then by Scraper, mixed fuel is sent into the returning charge lower limb of burner hearth, carry out secondary mixing in returning charge lower limb, with high temperature
Returning charge enters burner hearth together, by the hg in flue gas after burning0It is oxidized to hg2+；
Furnace rear demercuration assembly is as follows:
Described furnace rear demercuration assembly includes spray-type humidifier and sack cleaner (115), and described spray-type humidifier includes height
Water pump (112), described high-pressure hydraulic pump (112) passes through pipeline and electric control valve (114) is connected with the spray with atomizer
Rifle (113), spray gun (113) be arranged on air preheater (306) after back-end ductwork (305) in, air preheater (306) install
After cyclone separator (304), flue gas is through cyclone separator (304) air inlet preheater (306)；Described sack cleaner
(115) import connects back-end ductwork (305), and its outlet connects chimney (307) by air-introduced machine (308) and pipeline；
Demineralized water squeezes into pipeline by high-pressure hydraulic pump (112), and pipeline is divided into four big groups, and often big group separates 8 spray guns (113) again,
Amount to 32 spray guns (113) and be spaced layered arrangement；Flue gas after air preheater (306) enters in horizontal flue, spray gun
(113) water droplet after desalination water atomization is uniformly sprayed in whole horizontal flue, the water spraying into is by graininesscabr 2 Orhgbr 2 So as to together be immersed in the flourishing hole of flying dust, there is absorption or absorb in dissolving,cabr 2 Orhgbr 2 It is converted into granule
State hydrargyrum, flue gas, after spray-type humidifier, is divided into 4 strands of flue gases and respectively enters 4 dirt pockets, each clean room layout has 27
Sack cleaner (115), for catching particulate form hg (p) on flying dust for the absorption；
(2), set up the on-line monitoring system of two sets of hydrargyrum
After the on-line monitoring system of a set of hydrargyrum is arranged on air preheater (306), before spray gun (113), for monitoring in advance
Mercury content before furnace rear demercuration；The on-line monitoring system of another set of hydrargyrum is arranged on chimney (307) afterbody, passes through for monitoring flue gas
The mercury content in air is entered after controlling removing；
The on-line monitoring system of described hydrargyrum includes sampling unit, delivery unit, reduction unit, analytic unit data processing unit
Five parts；
Described sampling unit is using the thermodilution probe (201) equipped with fly ash particulate defecator, described thermodilution probe
(201) connect the anti-scavenging pipeline of compressed air, the compressed air in this anti-scavenging pipeline is controlled by dcs timing；
Described delivery unit is provided with the transport line of heat tracing line (203) (202) using outside, and heat tracing line (203) is always ensured that
It is more than 180 DEG C in the upper flue-gas temperature of transport line (202), prevent the hydrargyrum in flue gas from condensing on pipeline；
Described reduction unit adopts thermocatalytic reduction apparatus (204), and flue gas is heated to more than 760 DEG C, thus by hg in flue gas2+
It is completely converted into hg0；
Described analytic unit adopts mercury analyzer (205)；
Described data processing unit adopts dcs system (206)；The control signal of dcs has five tunnels, comprising: control electric flashboard
Door, control the first three-way valve, control the second three-way valve, control batcher, control electric control valve；The feedback signal of dcs has
Five tunnels, comprising: calcium bromide powder storehouse material level feedback, surge bunker material position feedback, gas mercury after batcher speed feedback, air preheater
Content feedback, chimney tail flue gas mercury content feedback.
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| CN106823773A (en) * | 2017-01-21 | 2017-06-13 | 北京清新环境技术股份有限公司 | A kind of coal-fired flue gas mercury removal method of use additive and adsorbent |
| CN106855472A (en) * | 2017-03-08 | 2017-06-16 | 中国华能集团清洁能源技术研究院有限公司 | A kind of stationary source particulate Hg and gaseous mercury isokinetic sampling device and the method for sampling |
| CN107238527A (en) * | 2017-04-28 | 2017-10-10 | 东南大学 | A kind of Pintsch process formula gas phase mercury shape reforming unit and method |
| CN111141560A (en) * | 2020-02-20 | 2020-05-12 | 南京科远智慧科技集团股份有限公司 | Dual-channel NOx concentration real-time monitoring device based on grid method mixed sampling |
| CN112649461A (en) * | 2020-09-16 | 2021-04-13 | 山西晋神沙坪煤业有限公司 | Device and method for measuring volatilization amount of hydrogen sulfide in pulverized coal |
| CN117205716B (en) * | 2023-11-07 | 2024-04-16 | 福建省铁拓机械股份有限公司 | Purification control method for plant-mixed thermal regeneration tail gas |
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