CN104740983A - Method and device for performing combined removal on boiler flue gas particulates and heavy metals - Google Patents

Method and device for performing combined removal on boiler flue gas particulates and heavy metals Download PDF

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Publication number
CN104740983A
CN104740983A CN201510163475.7A CN201510163475A CN104740983A CN 104740983 A CN104740983 A CN 104740983A CN 201510163475 A CN201510163475 A CN 201510163475A CN 104740983 A CN104740983 A CN 104740983A
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China
Prior art keywords
flue gas
mercury
adsorbent
fixed bed
bag
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CN201510163475.7A
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Chinese (zh)
Inventor
李德波
吕建燚
陆义海
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广东电网有限责任公司电力科学研究院
华北电力大学(保定)
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Priority to CN201510163475.7A priority Critical patent/CN104740983A/en
Publication of CN104740983A publication Critical patent/CN104740983A/en

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Abstract

The invention discloses a method and a device for performing combined removal on boiler flue gas particulates and heavy metals. The device comprises an electrostatic precipitation area, a heavy metal catalytic oxidation area, an adsorbent injection area and a bag-type dust removal area. The method comprises the following steps: allowing boiler flue gas to pass through the electrostatic precipitation area, efficiently capturing the particulates and the particle state heavy metals such as mercury and arsenic by virtue of an electrostatic precipitator, allowing the flue gas to pass through a mercury catalytic oxidizer fixed bed, converting zero-valent mercury into divalent mercury in the flue gas, injecting activated carbon behind the catalytic oxidizer fixed bed so as to adsorb and remove the heavy metals such as mercury and arsenic, and allowing the activated carbon adsorbing the heavy metals and escaping fly ash to enter a bag area so as to be captured. Original quality coal ash is discharged by an electric area ash bucket, the activated carbon adsorbing the heavy metals and a small amount of coal ash are discharged by a bag-area ash bucket, a small amount of discharge is realized, and most of a mixture circulates to a pipeline to be injected into the flue gas to be recycled. According to the device and the method provided by the invention, the combined removal on the particulates and the heavy metals can be effectively realized, and the efficiency of removing the heavy metals in the coal-fired flue gas is greatly improved.

Description

A kind ofly to combine the method and device thereof that remove with heavy metal for boiler smoke particle

Technical field

The invention belongs to using energy source and field of environment protection, relate to and a kind ofly combine the method and device thereof that remove particle and heavy metal in fire coal boiler fume.

Background technology

Mercury, arsenic are the chemical substances with serious physiological-toxicity, have extremely strong bioaccumulation and carcinogenic teratogenesis, are the great environmental problem threatening human health and ecological safety.A large amount of consumption of coal in global range, make fire coal become arsenic, the topmost man-made pollution source of mercury.Continue flue dust, SO in various countries 2after NOx, generally using the another emphasis of heavy metal as flue gas polution control, particularly mercury, arsenic are become to the focus of research.Increasingly strict along with coal-fired flue-gas heavy metals emission standard, adopts suitable technical method to realize the efficient removal of heavy metal in flue gas imperative.

Mercury in flue gas is with particle mercury Hgp, elemental mercury Hg 0with oxidation state mercury Hg 2+three kinds of forms exist, wherein particle mercury Hg premove by deduster, oxidation state mercury Hg 2+absorbing and removing in system can be removed in wet type, also can be converted into particulate form by absorption and be captured and remove, element state Hg 0owing to becoming gaseous state, and hydrophily is poor, thus deduster and wet type to remove system all low to its removal efficiency.Although when flue gas is by SCR system, minority elemental mercury Hg 0oxidation state mercury Hg can be oxidized to 2+but, still have the elemental mercury Hg of suitable vast scale 0do not remove by conventional flue gas purification system.For mercury pollution problem, research major part concentrates on two aspects both at home and abroad at present.One is the adsorbent studying high-efficiency and economic, and two is elemental mercury is changed into oxidation state mercury Hg 2+, utilize gaseous state bivalent mercury to have more easily by flying dust or adsorbent and feature soluble in water, a part of gaseous state bivalent mercury absorption changed into solid granulates mercury and removes in deduster, or change into bivalent mercury by wet flue gas desulfurizer absorbing and removing.Therefore, a kind of potential demercuration mode utilizes catalyst by the Hg in flue gas 0oxidation, improves Hg in flue gas 2+ratio, thus increase downstream deduster and WFGD to the capture rate of mercury.

In addition in dearsenification, CaO, active carbon, metal oxide etc. are all more effective adsorbents, and can pass through the form of chemisorbed or reaction, the gaseous state arsenic in flue gas is combined and it is changed into particulate form, thus realizes dust arrester catching arsenic.Meanwhile, wet desulphurization device heavy metal arsenic also has certain removal efficiency.

Summary of the invention

The object of this invention is to provide and a kind ofly to combine the method and device thereof that remove with heavy metal for boiler smoke particle, this device contains the adsorbing and removing method of catalytic oxidative desulfurization method and recyclable adsorbent for heavy metal removing, by the structural design to this device, effectively can improve coal-fired flue-gas heavy metal removing efficiency, adsorbent can be eliminated in heavy metal removing process on the impact of total utilization of PCA simultaneously, realize recycling of adsorbent, save adsorbent, reduce and remove cost.

Device provided by the invention, comprises the housing of hollow, flows to direction along flue gas, sets gradually electric precipitation district in described housing, mercury catalytic oxidant fixed bed, sorbent injection district and bag-type dusting district; Ash bucket is provided with below electric precipitation district and bag-type dusting district.The side of housing is provided with smoke inlet, and the opposite side of housing is provided with exhanst gas outlet.

Described mercury catalytic oxidant fixed bed, can arrange fixed bed and be at least one deck, if described fixed bed is multiple, the horizontal direction that multiple fixed bed should be kept to enter along flue gas is set up in parallel successively.Described fixed bed comprises ventilative grid I and ventilative grid II, is filled with catalytic oxidant between ventilative grid I and II, and catalytic oxidant adopts the form of catalyst bag to be seated between ventilative grid.The top of described fixed bed corresponding housing is provided with closed charging door, and the below of corresponding housing is provided with closed discharge port.Described loading, unloading material mouth is provided with electrically operated valve, realizes automatically completing handling material.

A kind of sorbent injection system provided by the invention, this spraying system is made up of transfer pipeline and injection line two parts, adsorbent conveyance conduit is by stretching in device above housing, the some equidistant uniform vertical of adsorbent jet pipe are had to be communicated with on adsorbent conveyance conduit, the multiple spray gun of device on adsorbent jet pipe, connect with flexible pipe between spray gun and jet pipe, spray gun is set in the both sides of jet pipe, it is vertical with flue gas stream direction that spray gun ejection adsorbent direction is set.On adjacent two jet pipes, spray gun evenly staggers arrangement, and during to ensure spray gun ejection adsorbent, both sides spray gun fully increases adsorbent coverage rate, and the adsorbent that simultaneously it also avoid the ejection of offside spray gun blocks spray gun mutually.

Provided by the inventionly a kind ofly combine the method removed with heavy metal for boiler smoke particle, take Powdered Activated Carbon as adsorbent, described active carbon is the modified active carbon of bromination, by pneumatic convey in the adsorbent transfer pipeline between mercury catalytic oxidation fixed bed and bag district, through lance ejection, Powdered Activated Carbon is made to be well dispersed in flue gas, in the flue gas of mercury catalytic oxidation fixed bed, overwhelming majority nonvalent mercury is converted into bivalent mercury, utilize bivalent mercury more easily by flying dust and adsorbent the feature of adsorbing, in flue gas, most heavy metal Hg and arsenic are adsorbed.Meanwhile, because activated carbon of sorbent is attached to cloth bag surface, actually define fixed bed of sorbent on filter bag surface, therefore also achieve high-efficiency mercury removal.The flue gas being mixed with active carbon is filtered by sack cleaner and makes its gas solid separation, and flue gas, through cloth bag, enters WFGD, is not tightly held by activated carbon bivalent mercury and heavy metal arsenic that agent adsorbs by absorbing and removing.Active carbon after demercuration and fly ash particulate trap, and in the active carbon trapped and fly ash mixture, 30%-40% arranges outward, and all the other 60%-70% are circulated to pipeline and again spray into and recycle.

Mercury catalytic oxidant fixed bed is set, transforming the nonvalent mercury not easily removed is bivalent mercury, improve mercuric ratio in flue gas, being beneficial to initial adsorbent material sprays into adsorbing and removing heavy metal on the one hand, improve adsorption efficiency, on the other hand, along with catalytic oxidation, the raising of bivalent mercury ratio in flue gas, can make WFGD equipment give full play to its demercuration.Flue gas is by after above-mentioned system, and WFGD can almost remove completely by bivalent mercury and heavy metal arsenic in flue gas behind bag district.

The invention has the beneficial effects as follows the function effectively utilizing prior art cooperation-removal heavy metal, heavy metal removing efficiency is high; Achieve heavy metal and particulate matter removing integration, the automated handling material of fixed bed can be realized simultaneously.The flyash of electricity district trapping can ensure the quality of ash, and ensure that the later use of flyash is worth, adsorbent is sprayed by described spraying system, is well dispersed in flue gas, effectively can improves adsorption efficiency, thus realize efficient removal heavy metal.Meanwhile, sorbent circulation utilizes and reduces adsorbent consumption, reduces demercuration cost.

Accompanying drawing explanation

Fig. 1 a kind ofly to combine the apparatus structure and schematic diagram that remove with heavy metal for boiler smoke particle.

Fig. 2 is sorbent injection system schematic diagram

In figure, 1-housing, 2-electric precipitation district, 3-mercury catalytic oxidant fixed bed, 4-sorbent injection system, 4-1-adsorbent conveyance conduit, 4-2-jet pipe, 4-3-spray gun, 5-bag-type dusting district, 6-ash bucket, 7-gas approach, 8-exhanst gas outlet, 9-circulating line

Detailed description of the invention

Below in conjunction with accompanying drawing, method of the present invention and device thereof are described in detail.

See Fig. 1, a kind ofly combine the device removed with heavy metal for boiler smoke particle, direction is flow to along flue gas, in the housing (1) of hollow, be disposed with electric precipitation district (2), mercury catalytic oxidant fixed bed (3), sorbent injection system (4) and bag-type dusting district (5); Ash bucket (6) is provided with below electric precipitation district and bag-type dusting district.The side of housing is provided with smoke inlet (7), and the opposite side of housing is provided with exhanst gas outlet (8).

First coal-burning boiler high-concentration fume carries out dust removal and filtration through electric precipitation district (2), remove most particle and partial particulate state heavy metal, and be collected in ash bucket 1 by filtering the fly ash particulate obtained, for the recycling of flyash, then flue gas is through mercury catalytic oxidant fixed bed (3), and in flue gas, most nonvalent mercury is converted into bivalent mercury;

The spraying system (4) being used for active carbon ejection is set between mercury catalytic oxidant fixed bed (3) and bag-type dusting district (5), the modified active carbon of bromination, by pneumatic convey in pipeline (4-1) between mercury catalytic oxidation fixed bed and bag district, the some equidistant uniform vertical of adsorbent jet pipe are had to be communicated with on adsorbent conveyance conduit (4-1), the multiple spray gun of device on jet pipe, Powdered Activated Carbon is through lance ejection, be well dispersed in flue gas, in the flue gas of mercury catalytic oxidation fixed bed most of bivalent mercury and heavy metal arsenic by activated carbon of sorbent and flying dust adsorb,

Flue gas enters a bag district subsequently, and activated carbon of sorbent is attached to cloth bag surface, and filter bag surface defines ADSORPTION IN A FIXED BED demercuration actually.Active carbon and escape flying dust trap and are stored in ash bucket 2 by bag-type dusting district (5).In ash bucket 2, the 30%-40% of mixture arranges outward, and all the other 60%-70% are circulated to pipeline (9) and again recycle as supplementary the spraying into of adsorbent;

By the flue gas of sack cleaner, enter WFGD, be not tightly held by activated carbon bivalent mercury and heavy metal arsenic that agent adsorbs by absorbing and removing.

Claims (5)

1. to combine the method and device thereof that remove with heavy metal for boiler smoke particle for one kind, it is characterized in that, this device comprises the housing (1) of hollow, direction is flow to along flue gas, electric precipitation district (2) is disposed with in described housing, mercury catalytic oxidant fixed bed (3), sorbent injection system (4) and bag-type dusting district (5); Ash bucket (6) is provided with below electric precipitation district and bag-type dusting district.The side of housing is provided with smoke inlet (7), and the opposite side of housing is provided with exhanst gas outlet (8).
2. particle according to claim 1 is combined with heavy metal and is removed device, it is characterized in that, sorbent injection district is provided with sorbent injection system (4), this system is made up of transfer pipeline (4-1) and injection line (4-2) two parts, adsorbent conveyance conduit is by stretching in device above housing, the some equidistant uniform vertical of adsorbent jet pipe are had to be communicated with on adsorbent conveyance conduit, the multiple spray gun of device (4-3) on adsorbent jet pipe, connect with flexible pipe between spray gun and jet pipe, spray gun is set in the both sides of jet pipe, it is vertical with flue gas stream direction that spray gun ejection adsorbent direction is set, on adjacent two jet pipes, spray gun evenly staggers arrangement, during to ensure spray gun ejection adsorbent, both sides spray gun fully increases adsorbent coverage rate, the adsorbent simultaneously avoiding offside spray gun to spray blocks spray gun mutually.
3. particle according to claim 1 is combined with heavy metal and is removed device, it is characterized in that, described mercury catalytic oxidant fixed bed (3), fixed bed can be set and be at least one deck, arrange fixed bed as being several, the horizontal direction that multiple fixed bed should be kept to enter along flue gas is set up in parallel successively.
4. fixed bed according to claim 3, it is characterized in that, fixed bed comprises ventilative grid I and ventilative grid II, mercury catalytic oxidant is filled with between ventilative grid I and II, catalytic oxidant adopts the form of catalyst bag to be seated between ventilative grid, and the top of described fixed bed corresponding housing is provided with closed charging door, and the below of corresponding housing is provided with closed discharge port, described dress discharge port is provided with electrically operated valve, realizes automatically completing dress discharge process.
5. to combine the method and device thereof that remove with heavy metal for boiler smoke particle for one kind, it is characterized in that, the method adopts the particle described in right 1 to combine with heavy metal and removes device, with powder bromination modified activated carbon for adsorbent, by pneumatic convey in the adsorbent transfer pipeline between mercury catalytic oxidation fixed bed and bag district, through the sorbent injection system described in right 2, adsorbent is by lance ejection, Powdered Activated Carbon is made to be well dispersed in flue gas, in the flue gas of mercury catalytic oxidation fixed bed, most heavy metal Hg and arsenic are adsorbed, the flue gas being mixed with active carbon is filtered by sack cleaner and makes its gas solid separation, flue gas is through cloth bag, enter WFGD, not by active carbon a small amount of bivalent mercury of adsorbing and heavy metal arsenic by absorbing and removing.After not being captured by the active carbon of cloth bag and particle, exclusive except part, all the other again to be sprayed into circulating line by pneumatic convey and recycle.
CN201510163475.7A 2015-03-31 2015-03-31 Method and device for performing combined removal on boiler flue gas particulates and heavy metals CN104740983A (en)

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Cited By (2)

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CN105354358A (en) * 2015-09-28 2016-02-24 广东电网有限责任公司电力科学研究院 On-site verification method and system for wet electric dust precipitator performance
CN106422615A (en) * 2016-08-02 2017-02-22 福建龙净环保股份有限公司 Electrostatic fabric filter for removing multiple pollutants in combined manner

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105354358A (en) * 2015-09-28 2016-02-24 广东电网有限责任公司电力科学研究院 On-site verification method and system for wet electric dust precipitator performance
CN105354358B (en) * 2015-09-28 2018-11-09 广东电网有限责任公司电力科学研究院 Wet electrical dust precipitator performance on-site verification method and system
CN106422615A (en) * 2016-08-02 2017-02-22 福建龙净环保股份有限公司 Electrostatic fabric filter for removing multiple pollutants in combined manner

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