CN103423757B - A kind of device and method utilizing polrvinyl chloride and boiler fly ash to carry out flue gas demercuration - Google Patents

A kind of device and method utilizing polrvinyl chloride and boiler fly ash to carry out flue gas demercuration Download PDF

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Publication number
CN103423757B
CN103423757B CN201310328146.4A CN201310328146A CN103423757B CN 103423757 B CN103423757 B CN 103423757B CN 201310328146 A CN201310328146 A CN 201310328146A CN 103423757 B CN103423757 B CN 103423757B
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China
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flue
batcher
adsorbent
polyvinyl chloride
mercury
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CN201310328146.4A
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CN103423757A (en
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高正阳
郑双清
周黎明
吴培昕
范元周
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North China Electric Power University
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North China Electric Power University
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Abstract

A kind of device and method utilizing polrvinyl chloride and boiler fly ash to carry out flue gas demercuration, it includes boiler furnace, flue and the chimney being sequentially connected with, economizer, air preheater, electrostatic precipitator and wet desulfuration tower is set gradually on flue, the most also include gas mercury on-line monitoring device, cycle flue, reducing mechanism, gasification installation, air heating apparatus, feeding device and intelligent controlling device, described cycle flue is arranged on the flue between economizer and air preheater, and the discharging opening of feeding device is connected on cycle flue;Described feeding device includes polyvinyl chloride scrap material batcher and adsorbent batcher.Nonvalent mercury is oxidized to gaseous state bivalent mercury by the hydrogen chloride that the present invention utilizes polyvinyl chloride scrap material to produce, and gas mercury is adsorbed by recycling boiler fly ash.On the premise of existing pollution control facility not being carried out large-scale redevelopment, removal effect and the demercuration efficiency of hydrargyrum can be greatly improved, saved demercuration cost, it is achieved that the environmental protection of polyvinyl chloride scrap material utilizes.

Description

A kind of device and method utilizing polrvinyl chloride and boiler fly ash to carry out flue gas demercuration
Technical field
The present invention relates to a kind of flue gas demercuration technology, a kind of utilize polrvinyl chloride and boiler fly ash in flue gas The device and method that hydrargyrum comprehensively removes.
Background technology
Hydrargyrum Hg is a kind of poisonous heavy metal element, and the Hg in environment has two kinds of sources: naturally discharge and anthropogenic discharge.Coal Charcoal burning is maximum artificial mercury emissions source, and environment can be caused severe contamination by the hydrargyrum being discharged in environment.Coal-burning power plant discharges Hg can account for the 70% of anthropogenic discharge, wherein nonvalent mercury (Hg0) it is main form of export, because its stable in properties is removed more tired Difficulty, therefore, effectively control, removal to nonvalent mercury are the key links in coal-fired flue gas mercury removal technology.
At present, expert both domestic and external has carried out numerous studies to coal-fired demercuration, finds that halogen and compound thereof are at cigarette QI prostration hydrargyrum aspect has the biggest advantage.Polrvinyl chloride is to apply a kind of plastics widely, and it is extensively made various product: Wire outer skin, optical cable coating, footwear, handbag, bag, jewelry, signboard and billboard, building decoration articles for use, furniture, ornament, roller, larynx Pipe, toy, door curtain, rolling door, medical assistance articles for use, glove, the tin foil of some food, some fashionable dress etc..Because polrvinyl chloride Purposes widely, so a large amount of polyvinyl chloride product garbage can inevitably be produced, environment is made by these garbages Become serious pollution.If the hydrargyrum in flue gas can be aoxidized by polyvinyl chloride scrap material for coal-fired power station boiler, then Polyvinyl chloride scrap material after process recycles, and waste material secondary the most both can have been avoided to utilize the hydrogen chloride caused to pollute, Again coal fired power plant demercuration is served facilitation, it is achieved that the environmental protection to polyvinyl chloride scrap material utilizes.
Common coal powder boiler flying ash has certain absorbability to the hydrargyrum in flue gas, and in flue gas, spray adds halogen elementary gas Can improve the flying dust absorbability to hydrargyrum, but if to reach more preferable adsorption effect to need the higher absorption of absorbability Agent.In prior art, removing the most effective and most widely used adsorbent of Elemental Mercury is activated carbon, although this technique effect shows Write the Elemental Mercury of removable 99%, but the operating cost of this technology (the mainly cost of activated carbon) is higher, be unfavorable for big Scope is promoted the use of, and the later-stage utilization of burned-coal fly ash can be had a negative impact by spraying into of activated carbon.M.Antonia Lopez-Anton etc. are at " Avoiding Mercury Emissions by Combustion in a Spanish Circulating Fluidized-Bed Combustion (CFBC) Plant " literary composition is mentioned: CFBB flying dust Can adsorb the gas mercury of 85%-97%, CFBB flying dust has the strongest suction because of its higher phosphorus content to gas mercury Attached ability, again because the addition of CFBB flying dust will not produce impact, institute to the later use of coal powder boiler flying ash To be a kind of more satisfactory adsorbent.
Summary of the invention
The technical problem to be solved is to provide one and utilizes polrvinyl chloride and boiler fly ash to carry out flue gas demercuration Method, the method demercuration is effective and low cost, and the dosage of demercuration additive is accurate, utilization rate is high.
Of the present invention technical problem is that with following technical proposals realize:
A kind of device utilizing polrvinyl chloride and boiler fly ash to carry out flue gas demercuration, it includes the Boiler Furnace being sequentially connected with Thorax, flue and chimney, flue sets gradually economizer, air preheater, electrostatic precipitator and wet desulfuration tower, the most also wraps Include gas mercury on-line monitoring device, cycle flue, feeding device, reducing mechanism, gasification installation, air heating apparatus and Based Intelligent Control Device, described cycle flue is arranged on the flue between economizer and air preheater, and the discharging opening of feeding device is connected to On cycle flue;Described feeding device includes polyvinyl chloride scrap material batcher and adsorbent batcher;Described air heating apparatus Including electric heater and heated air storage case;Described reducing mechanism is positioned at polyvinyl chloride scrap material batcher top.
The above-mentioned device utilizing polrvinyl chloride and boiler fly ash to carry out flue gas demercuration, described intelligent controlling device includes driving The motor of feeding device and controller, its middle controller includes multiplier, functional generator and PID controller, and gas mercury exists The input electrical connection of the signal output part of line monitor 3 and multiplier, the outfan of multiplier by functional generator with The input port electrical connection of PID controller, the outfan of PID controller is electrically connected with the working end of motor.
The above-mentioned device utilizing polrvinyl chloride and boiler fly ash to carry out flue gas demercuration, described installation wind in cycle flue Machine, the smoke inlet of cycle flue is in the position near air preheater entrance, and exhaust opening is in the position near economizer exit.
The above-mentioned device utilizing polrvinyl chloride and boiler fly ash to carry out flue gas demercuration, described polyvinyl chloride scrap material batcher and Adsorbent batcher is spiral batcher, and the discharging opening of polyvinyl chloride scrap material batcher is positioned at the discharging opening of adsorbent batcher Before.
A kind of method utilizing described device to carry out flue gas demercuration, described intelligent controlling device is dense according to Elemental Mercury in flue gas Degree and total mercury concentration control polyvinyl chloride scrap material batcher and the motor of adsorbent batcher respectively, by polyvinyl chloride scrap material and Adsorbent is respectively added in gasification installation and cycle flue, and polyvinyl chloride scrap material discharges hydrogen chloride gas after hot-air gasifies Body, hydrogen chloride gas is injected in flue after mixing with adsorbent;Elemental Mercury in flue gas is converted into bivalent mercury by hydrogen chloride, and By adsorbent;At electrostatic precipitator and wet desulfuration tower by flue gas mercury removal.
The above-mentioned method carrying out flue gas demercuration, described adsorbent is CFBB flying dust.
The present invention utilizes gaseous state bivalent mercury to be prone to, by flying dust absorption and feature soluble in water, add in the smokejack of boiler Oxidizer hydrogen chloride, is oxidized to gaseous state bivalent mercury by the nonvalent mercury in flue gas, and recycling CFBB flying dust is to oxygen Gas mercury after change adsorbs.Utilize described method in the premise that existing pollution control facility does not carries out large-scale redevelopment Under, removal effect and the demercuration efficiency of hydrargyrum can be greatly improved.Owing to the operating cost of activated carbon demercuration technology is at a relatively high, to Reaching the demercuration efficiency of 90%, often processing one pound of hydrargyrum needs 25000~70000 dollars.Therefore, the height of activated carbon demercuration adsorbent Cost constrains the popularization and application of this technology.This patent use cheap CFBB flying dust as adsorbent, therefore Save demercuration cost.
Elemental mercury concentration signal that intelligent controlling device is obtained by monitoring and flue gas flow signal, according to set in advance Polyvinyl chloride adds function ratio, controls the rotating speed of motor in spiral batcher, and then controls adding of polyvinyl chloride scrap material Dosage.In like manner controlled the addition of CFBB flying dust by flue gas total mercury concentration signal and flue gas flow signal, make Addition is more accurate, and the utilization ratio of additive is high.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention;
Fig. 2 is the schematic block circuit diagram that in the present invention, polyvinyl chloride scrap material adds intelligent controlling device;
Fig. 3 is the schematic block circuit diagram that in the present invention, adsorbent adds intelligent controlling device.
In figure, each list of reference numerals is: 1, boiler furnace, 2, flue, 3, gas mercury on-line monitoring device, 4, adsorbent batcher, 5, reducing mechanism, 6, polyvinyl chloride scrap material batcher, 7, gasification installation, 8, hot-air blower, 9, heated air storage case, 10, electricity Heater, 11, cycle flue blower fan, 12, air preheater, 13, wet desulfuration tower, 14, electrostatic precipitator, 15, chimney, 16, Economizer.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further detail.
As it is shown in figure 1, a kind of device utilizing polrvinyl chloride and boiler fly ash to carry out flue gas demercuration include boiler furnace 1, Flue 2, reducing mechanism 5, gasification installation 7, air heating apparatus, chimney 15, gas mercury on-line monitoring device 3 and Based Intelligent Control dress Putting, wherein flue 2 is connected to the afterbody of boiler furnace 1, and chimney 15 is connected to the afterbody of flue 2.Province's coal is set gradually on flue 2 Device 16, air preheater 12, electrostatic precipitator 14 and wet desulfuration tower 13.Cigarette between economizer 16 and air preheater 12 Arranging cycle flue on road 2, the smoke inlet of cycle flue is in the position near air preheater 12 entrance, and exhaust opening is near saving The position of coal device 16 outlet.On cycle flue, the direction along flow of flue gas installs cycle flue blower fan 11, gasification installation successively 7, polyvinyl chloride scrap material batcher 6, reducing mechanism 5 and adsorbent batcher 4, wherein cycle flue blower fan 11 is arranged on circulation cigarette In road, the discharging opening of gasification installation 7 is connected with cycle flue with the discharging opening of adsorbent batcher 4, and gasification installation 7 exports position Before adsorbent discharging opening.Gasification installation 7 top is provided with polyvinyl chloride scrap material batcher 6, polyvinyl chloride scrap material batcher 6 Top is provided with reducing mechanism 5.The hot-air of gasification installation derives from heated air storage case 9, heated air storage case 9 and gasification dress Put and the hot-air blower 8 controlling hot air flowrate is installed between 7, electric heater 10 is installed in heated air storage case 9.Polychlorostyrene Ethylene manure feedstock machine 6 and adsorbent batcher 4 are all spiral batcher, and this kind of feed-type adds accurately, and is prone to control System.
Gas mercury on-line monitoring device 3 can be able to use existing universal with the concentration of real-time continuous on-line monitoring gas mercury Number.Its monitoring probe is arranged in flue the position being positioned at air preheater 12 entrance, can detect and obtain flue gas total mercury Real-time concentration (μ g/m3) and Elemental Mercury real-time concentration (μ g/m3)。
Intelligent controlling device includes that polyvinyl chloride scrap material adds intelligent controlling device and adsorbent adds intelligent controlling device. Flue gas flow meter is arranged in flue 2, the flue gas real-time traffic of detection, and flow signal accesses intelligent controlling device, same flue gas The signal of total mercury real-time concentration and Elemental Mercury real-time concentration accesses intelligent controlling device.
Include for driving polyvinyl chloride scrap material batcher 6 as in figure 2 it is shown, polyvinyl chloride scrap material adds intelligent controlling device The motor M rotated and the controller being used for controlling polyvinyl chloride scrap material batcher 6 rotating speed;Controller includes multiplier X, function Generator F (x) and PID controller.Two inputs of multiplier X respectively with flue gas flow signal output part and gas mercury concentration Signal output part is electrically connected, and the outfan of multiplier X is connected by the sp port electrical of functional generator F (x) with PID controller Connect;The pv port of PID controller is electrically connected with the tach signal outfan of motor M;The outfan of PID controller is with electronic The job control end electrical connection of machine M.Multiplier X receives flue gas real-time traffic signal (m3/ s) and Elemental Mercury real-time concentration signal (μg/m3), calculating the real-time content (μ g/s) of Elemental Mercury in flue gas, functional generator F (x) is according to previously given polychlorostyrene second Alkene waste material adding proportion generate corresponding function, calculate the tach signal set-point of motor M, this tach signal set-point with The deviation of motor M actual speed show that after PID controller computing motor speed instruction controls the rotating speed of motor M, Motor M drives polyvinyl chloride scrap material batcher 6 to rotate, and makes polyvinyl chloride scrap material add by the Elemental Mercury cont signal of flue gas Add.
As it is shown on figure 3, adsorbent adds intelligent controlling device principle adds intelligent controlling device with polyvinyl chloride scrap material.Take advantage of Musical instruments used in a Buddhist or Taoist mass X1 receives flue gas real-time traffic signal (m3/ s) and flue gas total mercury real-time concentration signal (μ g/m3), calculate total mercury in flue gas Real-time content (μ g/s), functional generator E (x) generates corresponding function, meter according to previously given additive adding proportion Calculating the tach signal set-point of motor N, the deviation of this tach signal set-point and motor N actual speed is through PID1 control Showing after device computing that motor speed instruction controls the rotating speed of motor N, motor N drives additive feeder 4 to rotate, and makes Additive is added by the cont signal of flue gas total mercury.
The present invention utilizes polyvinyl chloride scrap material and recirculating fluidized bed flying dust to carry out the method for flue gas demercuration and work process such as Under:
In coal fired power plant boiler furnace 1 produce flue gas via flue 2, pass sequentially through economizer 16, air preheater 12, Discharge from chimney 15 after electrostatic precipitator 14 and wet desulfuration tower 13, cycle flue blower fan 11 by flue 2 afterbody (i.e. near air Preheater 12 entry position) partial fume be pumped in cycle flue, and upstream (i.e. near economizer 16 exit position) Discharging, the amount of circulating gas in cycle flue is controlled by cycle flue blower fan 11, after polyvinyl chloride scrap material size-reduced device 5 is pulverized Falling in polyvinyl chloride scrap material batcher 6, vinyl chloride manure feedstock machine 6 adds polyvinyl chloride scrap material powder to gasification installation 7 In, the hydrogen chloride gas produced after gasification is carried along in cycle flue with hot-air;Gasification hot-air used is by hot-air After electric heater 10 heating in storage bin 9 in hot-air blower 8 sends into gasification installation 7.Hot air temperature controls at 240- Between 340 DEG C, hot-air flow speed control is at 0.1-0.5m/s.The heat that polyvinyl chloride scrap material powder is pumped into through hot-air blower 8 After air gasification separates out hydrogen chloride gas, fly with the CFBB added in cycle flue by adsorbent batcher 4 Ash mixing, is injected to flue 2.Polyvinyl chloride scrap material after gasification process recycles.Polyvinyl chloride scrap material adds intelligence control Device processed controls the motor M's of polyvinyl chloride scrap material batcher 6 according to flue gas real-time traffic and Elemental Mercury real-time concentration Rotating speed, thus realize the control of the delivery rate to polyvinyl chloride scrap material batcher 6.Adsorbent adds intelligent controlling device foundation Flue gas real-time traffic and flue gas total mercury real-time concentration control the rotating speed of the motor N of adsorbent batcher 4, thus realize right The control of the delivery rate of adsorbent batcher 4.The polyvinyl chloride scrap material that polyvinyl chloride scrap material batcher 5 adds produces through gasification Mix with CFBB flying dust after hydrogen chloride gas, render in flue 2 with the flue gas in cycle flue, enter flue The hydrogen chloride gas of 2 reacts with the Elemental Mercury in flue gas, is allowed to be converted into gaseous state bivalent mercury, and a part of gaseous state bivalent mercury is by fine coal Converter fly ash and the absorption of CFBB flying dust, and then remove in electrostatic precipitator 14, some gaseous state bivalent mercury exists Thereafter wet desulfuration tower 13 removes, and the flue gas smoke-input tube 15 after wet desulfuration tower 13 drains into air.Hydrargyrum in flue gas More than 90% is all absorbed, and therefore greatly reduces the discharge of gas mercury, reduces environmental pollution, and avoids polrvinyl chloride and give up The hydrogen chloride that material secondary causes during utilizing pollutes, it is achieved that the environmental protection to polyvinyl chloride scrap material utilizes.

Claims (5)

1. utilizing polrvinyl chloride and boiler fly ash to carry out a device for flue gas demercuration, it includes the boiler furnace being sequentially connected with (1), flue (2) and chimney (15), flue (2) sets gradually economizer (16), air preheater (12), electrostatic precipitator (14) and wet desulfuration tower (13), it is characterised in that it also includes gas mercury on-line monitoring device (3), cycle flue, reducing mechanism (5), gasification installation (7), air heating apparatus, feeding device and intelligent controlling device, described cycle flue is arranged on economizer (16), on the flue (2) and between air preheater (12), the discharging opening of feeding device is connected on cycle flue;Described charging Device includes polyvinyl chloride scrap material batcher (6) and adsorbent batcher (4);
On cycle flue, the direction along flow of flue gas installs cycle flue blower fan (11), gasification installation (7) and adsorbent successively Batcher (4), wherein, cycle flue blower fan (11) is arranged in cycle flue, and the discharging opening of gasification installation (7) is given with adsorbent The discharging opening of material machine (4) is all connected with cycle flue, before gasification installation (7) outlet is positioned at adsorbent discharging opening;Polychlorostyrene second The size-reduced device of alkene waste material (5) falls into after pulverizing in polyvinyl chloride scrap material batcher (6), and polyvinyl chloride scrap material batcher (6) will Polyvinyl chloride scrap material powder adds in gasification installation (7), and the hydrogen chloride gas produced after gasification is carried along into by hot-air In cycle flue;Through hot-air blower after used by gasification, hot-air is heated by the electric heater (10) in heated air storage case (9) (8) send in gasification installation (7);The hot-air gasification that polyvinyl chloride scrap material powder is pumped into through hot-air blower (8) separates out chlorine After changing hydrogen, mix with the CFBB flying dust added in cycle flue by adsorbent batcher (4), be injected to Flue (2);The hydrogen chloride gas entering flue (2) reacts with the Elemental Mercury in flue gas, is allowed to be converted into gaseous state bivalent mercury, gaseous state Bivalent mercury is adsorbed by powder coal stove flying dust and CFBB flying dust, and then removes in electrostatic precipitator (14);
Installing cycle flue blower fan (11) in cycle flue, the smoke inlet of cycle flue is near air preheater (12) entrance Position, exhaust opening is in the position exported near economizer (16).
The device utilizing polrvinyl chloride and boiler fly ash to carry out flue gas demercuration the most according to claim 1, it is characterised in that Described intelligent controlling device includes motor and the controller driving feeding device, and its middle controller includes that multiplier, function are sent out Raw device and PID controller, the signal output part of gas mercury on-line monitoring device (3) is electrically connected with the input of multiplier, multiplication The outfan of device is electrically connected by the input port of functional generator with PID controller, and the outfan of PID controller is with electronic The working end electrical connection of machine.
The device utilizing polrvinyl chloride and boiler fly ash to carry out flue gas demercuration the most according to claim 2, it is characterised in that Described polyvinyl chloride scrap material batcher (6) and adsorbent batcher (4) are spiral batcher, polyvinyl chloride scrap material batcher (6) before discharging opening is positioned at the discharging opening of adsorbent batcher (4).
4. one kind utilizes the device utilizing polrvinyl chloride and boiler fly ash to carry out flue gas demercuration described in claim 1,2 or 3 to carry out The method of flue gas demercuration, it is characterised in that described intelligent controlling device is according to elemental mercury concentration in flue gas and total mercury concentration difference Control polyvinyl chloride scrap material batcher (6) and the motor of adsorbent batcher (4), by polyvinyl chloride scrap material and adsorbent difference Adding in gasification installation and cycle flue, polyvinyl chloride scrap material discharges hydrogen chloride gas, hydrogen chloride after hot-air gasifies Gas is injected in flue after mixing with adsorbent;Elemental Mercury in flue gas is converted into bivalent mercury by hydrogen chloride, and by adsorbent Absorption;At electrostatic precipitator and wet desulfuration tower by flue gas mercury removal.
The method carrying out flue gas demercuration the most according to claim 4, it is characterised in that described adsorbent is recirculating fluidized bed Boiler fly ash.
CN201310328146.4A 2013-07-31 2013-07-31 A kind of device and method utilizing polrvinyl chloride and boiler fly ash to carry out flue gas demercuration Expired - Fee Related CN103423757B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6719828B1 (en) * 2001-04-30 2004-04-13 John S. Lovell High capacity regenerable sorbent for removal of mercury from flue gas
CN101622056A (en) * 2007-03-09 2010-01-06 三菱重工业株式会社 Apparatus and method for treating discharge gas
CN103071375A (en) * 2013-02-07 2013-05-01 株洲三特环保节能有限公司 Smoke demercuration device and smoke demercuration method
CN103170236A (en) * 2013-03-01 2013-06-26 广东电网公司电力科学研究院 Intelligent demercuration addition agent adding system for coal-fired power plant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6719828B1 (en) * 2001-04-30 2004-04-13 John S. Lovell High capacity regenerable sorbent for removal of mercury from flue gas
CN101622056A (en) * 2007-03-09 2010-01-06 三菱重工业株式会社 Apparatus and method for treating discharge gas
CN103071375A (en) * 2013-02-07 2013-05-01 株洲三特环保节能有限公司 Smoke demercuration device and smoke demercuration method
CN103170236A (en) * 2013-03-01 2013-06-26 广东电网公司电力科学研究院 Intelligent demercuration addition agent adding system for coal-fired power plant

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