CN209501299U - A kind of stagewise flue gas demercuration and mercury enriching and recovering system - Google Patents
A kind of stagewise flue gas demercuration and mercury enriching and recovering system Download PDFInfo
- Publication number
- CN209501299U CN209501299U CN201821640165.5U CN201821640165U CN209501299U CN 209501299 U CN209501299 U CN 209501299U CN 201821640165 U CN201821640165 U CN 201821640165U CN 209501299 U CN209501299 U CN 209501299U
- Authority
- CN
- China
- Prior art keywords
- unit
- mercury
- outlet
- demercuration
- entrance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model relates to air filtration technical field, a kind of stagewise flue gas demercuration and mercury enriching and recovering system are disclosed, including flying dust modification unit, the first order are de- receives that mercury unit, catalytic oxidation unit, demercuration slurry unit, the second level is de- receives mercury unit and chimney；The discharge end of flying dust modification unit is connected to the de- feed end for receiving mercury unit of the first order, the de- discharge end for receiving mercury unit of the first order is connected to the feed end of catalytic oxidation unit, the discharge end of catalytic oxidation unit is connected to the de- feed end for receiving mercury unit in the second level, the discharge end of demercuration slurry unit is connected to the de- feed end for receiving mercury unit in the second level, and the de- exhaust end for receiving mercury unit in the second level is connected to chimney.The beneficial effect is that: stagewise demercuration is used, can the mercury of three kinds of forms in coal-fired flue-gas thoroughly be removed and be collected.
Description
Technical field
The utility model relates to air filtration technical fields, and in particular to a kind of stagewise flue gas demercuration and mercury enriching and recovering
System.
Background technique
With the development of economy, society also constantly aggravates the consumption of the energy such as coal, petroleum, the burning of fossil energy
SO can be generatedX、NOX, dust, many atmosphere pollutions such as mercury, wherein the mercury emissions of large coal-fired power plant boiler are the masters of mercury pollution
Source is wanted, therefore the mercury emissions effectively in control coal-fired plant flue gas are a problem to be solved.
Coal-fired flue gas mercury removal technology is broadly divided into demercuration before burning, demercuration after demercuration and burning in burning, wherein burning
Flue gas demercuration is the technology that mercury in flue gas removing is realized using flue-gas cleaning devices afterwards, is that current coal-burning power plant is most widely used
It is also most important mercury pollution control means.Currently, domestic actually put into commercial operation for the special of mercury control not yet
Door removing means, therefore, the demercuration effect of flue gas demercuration technology suffers from the influence of various operating conditions, demercuration effect after burning
Fruit is limited.
There are 3 kinds of grown forms for mercury in coal-fired flue-gas: element state Hg0, oxidation state Hg2+With particulate form HgP.Wherein, oxygen
Change state Hg2+With particulate form HgPIt can be removed by conventional pollutant catabolic gene equipment, due to element state Hg0High volatile, difficulty
Dissolubility, existing flue gas purifying equipment are difficult to be removed.Therefore, the key of coal-fired flue gas mercury removal is exactly element state Hg0's
Removing.Element state Hg can more be effectively treated at present0Method have 3 kinds: first is that using adsorbent adsorbing and removing, second is that using existing
There is pollutant catabolic gene equipment collaboration demercuration, third is that first by element state Hg0It is converted into oxidation state Hg2+It is removed again afterwards.However, adopting
Element state Hg is removed with adsorbent such as activated carbon adsorption0The higher cost of technology, and need to reach the adsorbent of saturation into
The processing of row desorption, complex process；The collaboration demercuration of existing equipment is unable to reach the discharge standard of country, and is enriched in flying dust
Mercury is not recycled timely, there is the Potential feasibility of pollution environment in the secondary use process of flying dust.
Coal-fired flue gas mercury removal technology is relatively difficult to meet environmental requirements at present and industrial application requires, in order to make demercuration technology
It preferably brings benefit to the mankind, it is also necessary to solve the problems, such as: (1) preparation of Cheap highly effective adsorbent；(2) pollutant catabolic gene equipment
Cooperate with the integrated and optimization of demercuration；(3) preparation of effective catalyst；(4) design and optimization of the recovery technology of mercury；(5) technology
With economic analysis etc..
Utility model content
The purpose of this utility model is to overcome above the shortcomings of the prior art, and providing one kind can effectively remove
Element state Hg in coal-fired flue-gas0, oxidation state Hg2+With particulate form HgPStagewise flue gas demercuration and mercury enriching and recovering system.
The purpose of this utility model is realized by the following technical solution: a kind of stagewise flue gas demercuration and mercury enriching and recovering
System, including the de- receipts mercury unit of flying dust modification unit, the first order, catalytic oxidation unit, demercuration slurry unit, the de- receipts mercury in the second level
Unit and chimney；The discharge end of the flying dust modification unit is connected to the de- feed end for receiving mercury unit of the first order, the first order
The de- discharge end for receiving mercury unit is connected to the feed end of catalytic oxidation unit, the discharge end of the catalytic oxidation unit and the second level
The de- feed end connection for receiving mercury unit, the de- feed end for receiving mercury unit of the discharge end of the demercuration slurry unit and the second level connect
Logical, the de- exhaust end for receiving mercury unit in the second level is connected to chimney.
Further, the flying dust modification unit includes flying dust storage room, electromagnetic rapping screening machine, modified-reaction room, inhales
Attached dose of storage room and blower；The outlet of the flying dust storage room is connected to the entrance of electromagnetic rapping screening machine, the electromagnetic rapping
The outlet of screening machine is connected to the entrance of modified-reaction room, and the outlet of the modified-reaction room and the entrance of sorbent storage silo connect
Logical, the outlet of the sorbent storage silo is connected to the de- feed end for receiving mercury unit of the first order, and the blower is set to adsorbent
The exit of storage room.
Further, the de- mercury unit of receiving of the first order includes electrostatic fabric filter, belt feeder and pickling tank；The electricity bag removes
The entrance of dirt device is connected to the discharge end of flying dust modification unit, the outlet of the electrostatic fabric filter and the charging of catalytic oxidation unit
End connection, the ash bucket of the electrostatic fabric filter is connected to the arrival end of belt feeder, the outlet end of the belt feeder and pickling tank
Entrance connection.
Further, the catalytic oxidation unit includes catalysis oxidizing tower, mixer and HCl storage room；The first order
The de- discharge end for receiving mercury unit is connected to an entrance of mixer, the outlet of the HCl storage room and mixer another
Entrance connection, the outlet of the mixer are connected to the entrance of catalysis oxidizing tower, the outlet and the second level of the catalysis oxidizing tower
The feed end of demercuration recovery unit is connected to.
Further, the demercuration slurry unit includes slurry pool, lime storage room, catch basin and blender；The stone
The outlet of grey storage room is connected to an entrance of slurry pool, and the outlet of the catch basin and another entrance of slurry pool connect
Logical, the mixing part of the blender is located in slurry pool, the outlet of the slurry pool and the charging of second level demercuration recovery unit
End connection.
Further, the de- mercury unit of receiving in the second level includes that vacuum-type drum filter, salt cleaning of evaporator, wastewater trough and desulfurization are inhaled
Receive tower；The discharge end of the catalytic oxidation unit is connected to the first charging aperture of desulfuration absorbing tower side wall bottom end, the demercuration slurry
The discharge end of material unit is connected to the second charging aperture of desulfuration absorbing tower side wall bottom end, the bottom end outlet of the desulfuration absorbing tower with
The entrance of vacuum-type drum filter is connected to, and the top export of the vacuum-type drum filter is connected to the entrance of salt cleaning of evaporator, described
The bottom end outlet of vacuum-type drum filter is connected to the entrance of wastewater trough, and the exhaust outlet of the desulfuration absorbing tower is connected to chimney.
It further, further include inhibitor storage room, the outlet and desulfuration absorbing tower side wall bottom of the inhibitor storage room
The third feed inlet at end is connected to.
Further, the inside of the desulfuration absorbing tower is equipped with spraying layer, and the spraying layer is installed on desulfuration absorbing tower
Exhaust outlet and desulfuration absorbing tower side wall bottom end outlet between, the outlet of desulfuration absorbing tower side wall bottom end and spraying layer
Entrance connection.
It further, further include control monitoring unit, the control monitoring unit includes that mercury content detector and measurement become
Send device, the end of probe of the mercury content detector is located at the inlet of chimney, the data transmission terminal of the mercury content detector with
One control terminal of measuring transducer connection, the measuring transducer is connect with the de- mercury unit of receiving in the second level, the measurement pick-up
Another control terminal of device is connect with catalytic oxidation unit.
Further, between the outlet of sorbent storage silo and the entrance of electrostatic fabric filter, the ash bucket of electrostatic fabric filter with
Motor-driven valve is mounted between the arrival end of the belt feeder and outlet of lime storage room and an entrance of slurry pool；Desulfurization
It absorbs between the outlet of tower side wall bottom end and the entrance of spraying layer, the outlet of inhibitor storage room and desulfuration absorbing tower side wall bottom end
Third feed inlet between, between the outlet of lime storage room and an entrance of slurry pool, the outlet of catch basin and slurry pool
Another entrance between and slurry pool outlet and desulfuration absorbing tower side wall bottom end second charging aperture between be mounted on pump
Body；Between the outlet of desulfuration absorbing tower side wall bottom end and the entrance of spraying layer, the bottom end outlet of desulfuration absorbing tower and vacuum drum
Between the entrance of filter, between the top export of vacuum-type drum filter and the entrance of salt cleaning of evaporator, vacuum-type drum filter
Between bottom end outlet and the entrance of wastewater trough, the third feed inlet of the outlet of inhibitor storage room and desulfuration absorbing tower side wall bottom end
Between, between the outlet of HCl storage room and another entrance of mixer, another entrance of the outlet of catch basin and slurry pool
Between and slurry pool outlet and desulfuration absorbing tower side wall bottom end second charging aperture between be mounted on gate valve.
The working method of a kind of stagewise flue gas demercuration and mercury enriching and recovering system, includes the following steps:
Removing and recycling HgP: modified flying dust adsorbent is delivered to the inlet of electrostatic fabric filter by blower, is carried out with flue gas
Mixing, mixed flue gas remove Hg under electrostatic fabric filter effectP, first order demercuration process is completed, Hg is enriched withPFlying dust
It is delivered to pickling tank through belt feeder, the wang aqueous solution in pickling tank dissolves HgP, complete first order mercury enriching and recovering process；
Removing and recycling Hg0: the flue gas that the HCl gas in HCl storage room is exported with electrostatic fabric filter fills in a mixer
After dividing mixing, catalytic oxidation occurs into catalysis oxidizing tower, makes Hg0It is transformed into Hg2+；Contain Hg2+Flue gas enter it is de-
It in sulphur absorption tower, reacts with demercuration slurries, removes Hg in flue gas2+, complete second level demercuration process；It is enriched in demercuration slurry
Hg in liquid2+It is transported to vacuum-type drum filter to be filtered, obtained filter cake is delivered to salt cleaning of evaporator, highly concentrated in salt cleaning of evaporator
It spends NaCl solution and dissolves Hg2+, complete second level mercury enriching and recovering process.
The utility model has the advantage that compared with the existing technology
1, the utility model can be carried out the mercury of three kinds of forms in coal-fired flue-gas thorough by stagewise hydrargyrum-removing technology
Removing and collection, have reached the low emission requirement of pollutant, and first order demercuration receives mercury using flying dust modification unit and the first order are de-
Unit is by the Hg in coal-fired flue-gasPIt thoroughly removes and collects, second level demercuration is under the action of catalytic oxidation unit by Hg0Conversion
For Hg2+, then by thoroughly absorbing Hg under the de- receipts mercury unit in the second level and the collective effect by slurry unit2+And it completes to collect
Work, reaches the requirement of the low emission of mercury.
2, the flying dust modification unit in the utility model, used modified flying dust adsorbent are generated from boiler combustion
Flying dust have the advantages that cost is lower compared with active carbon；Modified obtained flying dust adsorbent can be formed on its surface
HgCl (or HgBr), shows as chemisorption, compared with unmodified active carbon physical absorption ability, has preferably absorption de-
Mercury performance.
3, stagewise mercury enriching and recovering technique is used in the utility model, first order mercury enriching and recovering is will to be adsorbed with HgP
Flying dust be dissolved in the wang aqueous solution in pickling tank, second level mercury enriching and recovering is by Hg2+It is dissolved in the NaCl solution of high concentration, it is at different levels
The division of labor is clear, can effectively recycle the by-product of mercury, avoid secondary pollution.
4, the utility model can effectively inhibit Hg by the way that oxidation retarder NaHS solution is added into demercuration slurry2+→
The generation of Hg0 reaction, promotes demercuration slurry to Hg2+Solution absorption, improve oxidation state Hg2+Removal efficiency.
5, the control detection unit that mercury content detector and measuring transducer form is equipped in the utility model, it can be real-time
The control to various operating conditions is completed, to realize that the mercury in 24 hours automatically-controlled continuous coal-fired flue-gas of industrial processes is arranged, drop
The cost of labor of low enterprise improves enterprises production efficiency.
Detailed description of the invention
Fig. 1 is the stagewise flue gas demercuration of the utility model and the structural schematic diagram of mercury enriching and recovering system；
In figure, 1 is flying dust storage room；2 be electromagnetic rapping screening machine；3 be modified-reaction room；4 be sorbent storage silo；5
For blower；6 be electrostatic fabric filter；7 be belt feeder；8 be pickling tank；9 be vacuum-type drum filter；10 be salt cleaning of evaporator；11 be useless
Sink；12 be desulfuration absorbing tower；13 be spraying layer；14 be slurry pool；15 be lime storage room；16 be catch basin；17 be stirring
Machine；18 be catalysis oxidizing tower；19 be mixer；20 be HCl storage room；21 be mercury content detector；22 be measuring transducer；
23 be chimney；24 be motor-driven valve；25 be the pump housing；26 be gate valve；27 be inhibitor storage room.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.
A kind of stagewise flue gas demercuration as shown in Figure 1 and mercury enriching and recovering system, including flying dust modification unit, the first order
It is de- to receive mercury unit, catalytic oxidation unit, demercuration slurry unit, the de- receipts mercury unit in the second level and chimney；The flying dust modification unit
Discharge end and the first order de- feed end for receiving mercury unit be connected to, the discharge end and catalysis oxidation of the de- receipts mercury unit of the first order
The feed end of unit is connected to, and the discharge end of the catalytic oxidation unit is connected to the de- feed end for receiving mercury unit in the second level, described
The discharge end of demercuration slurry unit is connected to the de- feed end for receiving mercury unit in the second level, the de- exhaust for receiving mercury unit in the second level
End is connected to chimney 23.
The flying dust modification unit includes flying dust storage room 1, electromagnetic rapping screening machine 2, modified-reaction room 3, adsorbent storage
Deposit room 4 and blower 5；The outlet of the flying dust storage room 1 is connected to the entrance of electromagnetic rapping screening machine 2, the electromagnetic rapping sieve
The outlet of extension set 2 is connected to the entrance of modified-reaction room 3, the outlet of the modified-reaction room 3 and the entrance of sorbent storage silo 4
The outlet of connection, the sorbent storage silo 4 is connected to the de- feed end for receiving mercury unit of the first order, the sorbent storage silo 4
Exit motor-driven valve 24 and blower 5 are installed.Flying dust in flying dust storage room 1 comes from boiler furnace, passes through electromagnetic rapping
Screening machine 2 screens out the flying dust that partial size is 30~60 μm, into modified-reaction room 3, is soaked in modified-reaction room 3 using solution
Bubble method carries out flying dust halogen modified, and obtained modification flying dust adsorbent storage is stored in sorbent storage silo 4, in the effect of blower 5
Modification flying dust adsorbent in lower sorbent storage silo 4 enters in electrostatic fabric filter 6 after mixing with flue gas.Wherein, to flying dust
Carrying out halogen modified solution can be NaCl or NaBr solution, by preparing one kind inexpensively to flying dust progress is halogen modified
High-efficiency adsorbent.
The de- mercury unit of receiving of the first order includes electrostatic fabric filter 6, belt feeder 7 and pickling tank 8；The electrostatic fabric filter 6
Entrance and sorbent storage silo 4 outlet, the feed end of the outlet of the electrostatic fabric filter 6 and catalytic oxidation unit connects
Logical, the ash bucket of electrostatic fabric filter 6 is connected to by pipeline with the arrival end of belt feeder 7, and motor-driven valve 24 is equipped on this pipeline, described
The outlet end of belt feeder 7 is connected to the entrance of pickling tank 8.The flue gas for being mixed with modified flying dust adsorbent enters electrostatic fabric filter 6
Afterwards, between plate under the action of voltage, Bag filter, Hg in flue gasP(particulate Hg), which is adsorbed, to be dropped into ash bucket, and the first order is completed
Demercuration process；The Hg being enriched in ash bucketPPickling tank 8 is reached by the transport of belt feeder 7, is acted on, is completed by the pickling of solution
The first order enriching and recovering process of mercury.Wherein the solution in pickling tank 8 is chloroazotic acid, by concentrated hydrochloric acid and concentrated nitric acid by volume 3:
1 is formulated.
The catalytic oxidation unit includes catalysis oxidizing tower 18, mixer 19 and HCl storage room 20；Electrostatic fabric filter 6
Outlet is connected to an entrance of mixer 19, and the outlet of the HCl storage room 20 passes through another of pipeline and mixer 19
Entrance is connected to, and is equipped with gate valve 26 on this pipeline；The outlet of the mixer 19 is connected to the entrance of catalysis oxidizing tower 18, described
The outlet of catalysis oxidizing tower 18 is connected to the first charging aperture of 12 side wall bottom end of desulfuration absorbing tower.HCl gas in HCl storage room 20
It is anti-into oxidation occurs in catalysis oxidizing tower 18 after the flue gas that body and electrostatic fabric filter 6 export is sufficiently mixed in mixer 19
It answers, Hg0It is oxidized to Hg2+.Catalysis oxidizing tower 18 is material filling type reaction tower, and catalytic bed contains the Mo- that total load amount is 10%
Mn-ATP catalyst, wherein Mo:Mn=1:3, the optimum working temperature of catalyst are 120 DEG C, optimal conversion η=96%.
The demercuration slurry unit includes slurry pool 14, lime storage room 15, catch basin 16 and blender 17；The stone
The outlet of grey storage room 15 is connected to by pipeline with an entrance of slurry pool 14, and the pump housing 25 and motor-driven valve are equipped on this pipeline
24；The outlet of the catch basin 16 is connected to by pipeline with another entrance of slurry pool 14, and the pump housing 25 is equipped on this pipeline
With gate valve 26；The mixing part of the blender 17 is located in slurry pool 14, and the outlet of the slurry pool 14 passes through pipeline and desulfurization
The second charging aperture of 12 side wall bottom end of absorption tower is connected to, and is equipped with the pump housing 25 and gate valve 26 on this pipeline.In lime storage room 15
Water in the lime stone and catch basin 16 in portion is delivered to slurry pool 14 by the pump housing 25, under the stirring action of blender 17, obtains
To lime stone suspension, and it is transported to the first charging aperture of 12 side wall bottom end of desulfuration absorbing tower.Wherein, water is mixed with lime stone
Volume ratio be 10:1.
The de- mercury unit of receiving in the second level includes vacuum-type drum filter 9, salt cleaning of evaporator 10, wastewater trough 11 and desulfuration absorbing tower
12；The discharge end of the catalytic oxidation unit is connected to the first charging aperture of 12 side wall bottom end of desulfuration absorbing tower, the demercuration slurry
The discharge end of material unit is connected to the second charging aperture of 12 side wall bottom end of desulfuration absorbing tower, and the bottom end outlet of desulfuration absorbing tower 12 is logical
Piping is connected to the entrance of vacuum-type drum filter 9, and gate valve 26 is equipped on this pipeline；The top of vacuum-type drum filter 9
Outlet is connected to by pipeline with the entrance of salt cleaning of evaporator 10, and gate valve 26 is equipped on this pipeline；The bottom end of vacuum-type drum filter 9 goes out
Mouth is connected to by pipeline with the entrance of wastewater trough 11, and gate valve 26 is equipped on this pipeline；The exhaust outlet of the desulfuration absorbing tower 12
It is connected to chimney 23.Desulfuration absorbing tower 12 is material filling type reaction tower, and inner stuffing is in stepped annular.Solution in salt cleaning of evaporator 10
For high concentration NaCl solution, the mass fraction of NaCl solution is 23%~26%.
The inside of the desulfuration absorbing tower 12 is equipped with spraying layer 13, and the spraying layer 13 is installed on desulfuration absorbing tower 12
Between the outlet of 12 side wall bottom end of exhaust outlet and desulfuration absorbing tower, the outlet of the 12 side wall bottom end of desulfuration absorbing tower passes through pipe
Road is connected to the entrance of spraying layer 13, and the pump housing 25 and gate valve 26 are equipped on this pipeline.
The de- mercury unit of receiving in the second level further includes inhibitor storage room 27, and the outlet of the inhibitor storage room 27 passes through pipeline
It is connected to the third feed inlet of 12 side wall bottom end of desulfuration absorbing tower, the pump housing 25 and gate valve 26 is installed on this pipeline.Inhibitor storage
Depositing room 27 is NaHS storage room, and NaHS solution is housed.NaHS solution is delivered to 12 side wall bottom end of desulfuration absorbing tower by the pump housing 25
Third feed inlet, mixed with demercuration slurry, inhibit Hg2+→Hg0The generation of reaction.
The de- workflow for receiving mercury unit in the second level are as follows: the demercuration slurry and inhibitor of 12 bottom of desulfuration absorbing tower pass through de-
The second charging aperture and third feed inlet of 12 side wall bottom end of sulphur absorption tower enter the bottom of desulfuration absorbing tower 12, demercuration slurry and
Outlet of the mixed solution of inhibitor through 12 side wall bottom end of desulfuration absorbing tower is simultaneously delivered to spraying layer 13, spraying layer by the pump housing 25
The mixed solution of 13 injections and the flue gas of rising sufficiently react, and absorb the Hg in flue gas2+, complete second level demercuration process, purification
Flue gas afterwards is discharged from the exhaust outlet at 12 top of desulfuration absorbing tower through chimney 23.It is enriched with Hg2+Mixed solution from desulfuration absorbing tower
12 bottom end outlet is discharged to vacuum-type drum filter 9 by gate valve 26, and the filtrate being obtained by filtration through vacuum-type drum filter 9 is discharged to
Wastewater trough 11, the filter cake being obtained by filtration then are delivered to salt cleaning of evaporator 10, by the effect of washing of the salt of solution, complete the second level enrichment of mercury
Removal process.
It further include control monitoring unit, the control monitoring unit includes mercury content detector 21 and measuring transducer 22,
The end of probe of the mercury content detector 21 is located at the inlet of chimney 23, the data transmission terminal of the mercury content detector 21 with
Measuring transducer 22 connects, the control terminal and 12 side wall bottom end outlet of desulfuration absorbing tower and spray of the measuring transducer 22
Gate valve 26 between 13 entrance of layer connects, another control terminal of the measuring transducer 22 and the outlet of HCl storage room 20 and
Gate valve 26 between another entrance of mixer 19 connects.Mercury content detector 21 detects Hg in 23 inlet flue gas of chimney0
Content, and by data feedback to measuring transducer 22, measuring transducer 22 passes through the measurement of 21 Real-time Feedback of mercury content detector
Data control the aperture (lock of two gate valves 26 between HCl storage room 20 and mixer 19 between desulfuration absorbing tower 12 and spraying layer 13
The openings of sizes of valve 26).Using control monitoring unit, according to the Hg of 23 inlet of chimney0Content control enters in spraying layer 13
Demercuration slurry flow, and enter mixer 19 in HCl gas flow.
Related instrument in the utility model, equipment are available on the market, and the modification in the utility model flies
Ash adsorbent, chloroazotic acid, NaCl solution, NaHS solution are medicament commonly used in the art.
The working method of a kind of stagewise flue gas demercuration and mercury enriching and recovering system, includes the following steps:
Removing and recycling HgP: modified flying dust adsorbent is delivered to the inlet of electrostatic fabric filter 6 by blower 5, with flue gas into
Row mixing, mixed flue gas remove Hg under the effect of electrostatic fabric filter 6P, first order demercuration process is completed, Hg is enriched withP's
Flying dust is delivered to pickling tank 8 through belt feeder 7, and the wang aqueous solution in pickling tank 8 dissolves HgP, complete first order mercury enriching and recovering mistake
Journey；
Removing and recycling Hg0: the flue gas that HCl gas and electrostatic fabric filter 6 in HCl storage room 20 export is in mixer 19
In be sufficiently mixed after, into catalysis oxidizing tower 18 occur catalytic oxidation, make Hg0It is transformed into Hg2+；Contain Hg2+Flue gas into
Enter into desulfuration absorbing tower 12, react with demercuration slurries, removes Hg in flue gas2+, complete second level demercuration process；It is enriched in
Hg in demercuration slurries2+It is transported to vacuum-type drum filter 9 to be filtered, obtained filter cake is delivered to salt cleaning of evaporator 10, and salt is washed
High concentration NaCl solution in tank 10 dissolves Hg2+, complete second level mercury enriching and recovering process.
A kind of specific workflow of stagewise flue gas demercuration and mercury enriching and recovering system are as follows:
The flying dust section store that burning boiler generates obtains grain in flying dust storage room 1, by the screening of electromagnetic rapping screening machine 2
The flying dust that diameter is 30~60 μm, enters in modified-reaction room 3, using solution infusion method, with halogen solutions such as NaCl or NaBr
Solution is modified flying dust to obtain modified flying dust adsorbent, and is stored in sorbent storage silo 4.When coal-fired flue-gas reaches electric bag
When the inlet of deduster 6, modified flying dust adsorbent is delivered to the inlet of electrostatic fabric filter 6 by blower 5, with coal-fired flue-gas into
It is entered in electrostatic fabric filter 6 after row adequately mixing, the particulate form between plate under the action of voltage, Bag filter, in flue gas
Mercury HgPIt after the flying dust adsorbent that is modified absorption, drops into ash bucket, completes first order demercuration process.When the flying dust product in ash bucket
When tiring out a certain amount of, the motor-driven valve 24 between ash bucket and belt feeder 7 is opened, flying dust falls on the arrival end of belt feeder 7, passes through belt
Machine 7 is delivered in pickling tank 8, and pickling tank 8 contains wang aqueous solution, and by concentrated hydrochloric acid and concentrated nitric acid, 3:1 is mixed by volume,
Aqua regia dissolution's particle mercury HgP, complete first order mercury enriching and recovering process.
The gate valve 26 between HCl storage room 20 and mixer 19 is opened, HCl gas is removed through entering mixer 19 with electric bag
After the flue gas that dirt device 6 exports adequately is mixed herein, enter in catalysis oxidizing tower 18.Catalysis oxidizing tower 18 is filler
Formula reaction tower, catalytic bed contain the Mo-Mn-ATP catalyst that total load amount is 10%, can be by the element in coal-fired flue-gas
State Hg0It is converted into oxidation state Hg2+, the flue gas after being oxidized enters desulfuration absorbing tower by the outlet on 18 top of catalysis oxidizing tower
In 12.The motor-driven valve 24 between lime storage room 15 and slurry pool 14 is opened, the lime stone in lime storage room 15 passes through the pump housing
25 are delivered to slurry pool 14, open the gate valve 26 between catch basin 16 and slurry pool 14, and the water in catch basin 16 passes through the pump housing 25
It is delivered to slurry pool 14, lime stone and water and forms demercuration slurry under the stirring action of blender 17 according to volume ratio 1:10, and
It is transported to desulfuration absorbing tower 12.The gate valve 26 between inhibitor storage room 27 and desulfuration absorbing tower 12 is opened, NaHS solution is logical
The third feed inlet that the pump housing 25 is delivered to 12 side wall bottom end of desulfuration absorbing tower is crossed, is mixed to form mixed solution with demercuration slurry.It is de-
The mixed solution of 12 bottom of sulphur absorption tower is delivered to the spraying layer 13 in desulfuration absorbing tower 12 by the pump housing 25.Desulfuration absorbing tower 12
Inner stuffing be cascade ring, the demercuration slurry of spray and the flue gas of rising come into full contact in filler, and mixed solution absorbs cigarette
Oxidation state Hg in gas2+, purified flue gas is discharged by the exhaust outlet of desulfuration absorbing tower 12 through chimney 23, and the second level is completed
Demercuration process.Dissolved with oxidation state Hg2+Mixed solution vacuum drum mistake is delivered to by the bottom end outlet of desulfuration absorbing tower 12
Filter 9, under the centrifugation rotation of vacuum-type drum filter 9, obtained filtrate enters wastewater trough 11, and obtained filter cake is delivered to
Salt cleaning of evaporator 10.It, can be by the oxidation state Hg in filter cake containing the NaCl solution of high concentration in salt cleaning of evaporator 102+Dissolution completes second
Grade mercury enriching and recovering process.
Chimney inlet is connected with control monitoring unit, and the element state Hg in flue gas to be discharged can be monitored in real time0Contain
Amount.When too high levels, on the one hand measuring transducer 22 increases by the aperture of two gate valves 26 of control and enters mixer 19
The content of HCl gas promotes element state Hg0It is converted into oxidation state Hg2+, on the other hand increase the spray flow of demercuration slurry, that is, increase
Big liquid-gas ratio, to promote demercuration slurry to oxidation state Hg2+Absorption.
Equipment component material needed for scheme is implemented and installation parameter are detailed in following table:
Economic results in society analysis:
After scheme is implemented, the mercury of three kinds of forms in coal-fired flue-gas can be effectively removed, while also can be in coal-fired flue-gas
The mercury of removing carries out effective enriching and recovering.With a 300MW Thermal generation unit, it is 2300000m that system, which receives exhaust gas volumn,3/
H, mercury content 50mg/m3, use active carbon demercuration cost for 25000~70000 dollars/pound, and it is modified flying dust base adsorbent
Demercuration cost is only the 60% of active carbon demercuration cost；0.05~0.15mg/ of mercury in flue gas content after existing demercuration technology purification
m3, mercury content 0.01mg/m after the purification of this programme demercuration technology3, demercuration effect improves 80%；The mercury of this programme design recycles rich
Collection technology can effectively recycle the by-product that demercuration obtains, and the secondary pollution problem generated to environment is avoided.This
The implementation of kind of scheme, the mercury being both effectively stripped of in coal-fired flue-gas reduce the pollution problem that mercury emissions cause pair environment, again
Mercury effectively has been recycled, has avoided secondary pollution, has promoted the sustainable development of human society.
Above-mentioned specific embodiment is the preferred embodiment of the utility model, can not be defined to the utility model,
Other any changes made without departing from the technical solution of the utility model or other equivalent substitute modes, are included in
Within the protection scope of the utility model.
Claims (9)
1. a kind of stagewise flue gas demercuration and mercury enriching and recovering system, it is characterised in that: de- including flying dust modification unit, the first order
Receive mercury unit, catalytic oxidation unit, demercuration slurry unit, the de- receipts mercury unit in the second level and chimney；The flying dust modification unit
Discharge end is connected to the de- feed end for receiving mercury unit of the first order, the de- discharge end and catalysis oxidation list for receiving mercury unit of the first order
The discharge end of the feed end connection of member, the catalytic oxidation unit is connected to the de- feed end for receiving mercury unit in the second level, described de-
The discharge end of mercury slurry unit is connected to the de- feed end for receiving mercury unit in the second level, the de- exhaust end for receiving mercury unit in the second level
It is connected to chimney.
2. stagewise flue gas demercuration according to claim 1 and mercury enriching and recovering system, it is characterised in that: the flying dust changes
Property unit includes flying dust storage room, electromagnetic rapping screening machine, modified-reaction room, sorbent storage silo and blower；The flying dust storage
The outlet for depositing room is connected to the entrance of electromagnetic rapping screening machine, the outlet of the electromagnetic rapping screening machine and entering for modified-reaction room
Mouthful connection, the outlet of the modified-reaction room be connected to the entrance of sorbent storage silo, the outlet of the sorbent storage silo and
The de- feed end connection for receiving mercury unit of the first order, the blower are set to the exit of sorbent storage silo.
3. stagewise flue gas demercuration according to claim 1 and mercury enriching and recovering system, it is characterised in that: the first order
De- mercury unit of receiving includes electrostatic fabric filter, belt feeder and pickling tank；The entrance of the electrostatic fabric filter and flying dust modification unit
Discharge end connection, the outlet of the electrostatic fabric filter are connected to the feed end of catalytic oxidation unit, the ash of the electrostatic fabric filter
Bucket is connected to the arrival end of belt feeder, and the outlet end of the belt feeder is connected to the entrance of pickling tank.
4. stagewise flue gas demercuration according to claim 1 and mercury enriching and recovering system, it is characterised in that: the catalysis oxygen
Changing unit includes catalysis oxidizing tower, mixer and HCl storage room；The first order takes off the discharge end and mixer for receiving mercury unit
The connection of one entrance, the outlet of the HCl storage room are connected to another entrance of mixer, the outlet of the mixer with urge
Change the entrance connection of oxidizing tower, the outlet of the catalysis oxidizing tower is connected to the feed end of second level demercuration recovery unit.
5. stagewise flue gas demercuration according to claim 1 and mercury enriching and recovering system, it is characterised in that: the demercuration slurry
Material unit includes slurry pool, lime storage room, catch basin and blender；One of the outlet of the lime storage room and slurry pool
Entrance connection, the outlet of the catch basin are connected to another entrance of slurry pool, and the mixing part of the blender is located at slurry
The outlet of Chi Zhong, the slurry pool are connected to the feed end of second level demercuration recovery unit.
6. stagewise flue gas demercuration according to claim 1 and mercury enriching and recovering system, it is characterised in that: the second level
De- mercury unit of receiving includes vacuum-type drum filter, salt cleaning of evaporator, wastewater trough and desulfuration absorbing tower；The discharging of the catalytic oxidation unit
End is connected to the first charging aperture of desulfuration absorbing tower side wall bottom end, the discharge end of the demercuration slurry unit and desulfuration absorbing tower side
The second charging aperture of wall bottom end is connected to, and the bottom end outlet of the desulfuration absorbing tower is connected to the entrance of vacuum-type drum filter, institute
The top export for stating vacuum-type drum filter is connected to the entrance of salt cleaning of evaporator, the bottom end outlet of the vacuum-type drum filter and useless
The entrance of sink is connected to, and the exhaust outlet of the desulfuration absorbing tower is connected to chimney.
7. stagewise flue gas demercuration according to claim 6 and mercury enriching and recovering system, it is characterised in that: further include inhibiting
The outlet of agent storage room, the inhibitor storage room is connected to the third feed inlet of desulfuration absorbing tower side wall bottom end.
8. stagewise flue gas demercuration according to claim 7 and mercury enriching and recovering system, it is characterised in that: the desulfurization is inhaled
The inside for receiving tower is equipped with spraying layer, and the spraying layer is installed on exhaust outlet and the desulfuration absorbing tower side wall bottom end of desulfuration absorbing tower
Outlet between, the outlet of side wall bottom end of the desulfuration absorbing tower is connected to the entrance of spraying layer.
9. stagewise flue gas demercuration according to claim 1 and mercury enriching and recovering system, it is characterised in that: further include control
Monitoring unit, the control monitoring unit include mercury content detector and measuring transducer, the detection of the mercury content detector
End is located at the inlet of chimney, and the data transmission terminal of the mercury content detector is connect with measuring transducer, the measurement pick-up
One control terminal of device is connect with the de- mercury unit of receiving in the second level, another control terminal and catalysis oxidation list of the measuring transducer
Member connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821640165.5U CN209501299U (en) | 2018-10-10 | 2018-10-10 | A kind of stagewise flue gas demercuration and mercury enriching and recovering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821640165.5U CN209501299U (en) | 2018-10-10 | 2018-10-10 | A kind of stagewise flue gas demercuration and mercury enriching and recovering system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209501299U true CN209501299U (en) | 2019-10-18 |
Family
ID=68191923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821640165.5U Expired - Fee Related CN209501299U (en) | 2018-10-10 | 2018-10-10 | A kind of stagewise flue gas demercuration and mercury enriching and recovering system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209501299U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109200784A (en) * | 2018-10-10 | 2019-01-15 | 华南理工大学 | A kind of stagewise flue gas demercuration and mercury enriching and recovering system and its working method |
| CN111068504A (en) * | 2019-12-25 | 2020-04-28 | 华北电力大学 | Method and device for removing heavy metal and VOC (volatile organic compounds) by using modified fly ash |
-
2018
- 2018-10-10 CN CN201821640165.5U patent/CN209501299U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109200784A (en) * | 2018-10-10 | 2019-01-15 | 华南理工大学 | A kind of stagewise flue gas demercuration and mercury enriching and recovering system and its working method |
| CN111068504A (en) * | 2019-12-25 | 2020-04-28 | 华北电力大学 | Method and device for removing heavy metal and VOC (volatile organic compounds) by using modified fly ash |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100340683C (en) | Sorbents and methods for the removal of mercury from combustion gases | |
| CN101274193B (en) | System for purifying flue gas and recovering sulfur and technique | |
| CN102225303B (en) | Combined apparatus and method for dedusting, desulphurization, denitration, demercuration and smoke extraction of coal-fired flue gas | |
| CN109569228A (en) | The exhaust system and technique of flue gas of garbage furnace | |
| CN209501299U (en) | A kind of stagewise flue gas demercuration and mercury enriching and recovering system | |
| CN104162359A (en) | Method for synchronous desulfurization, denitrification, mercury removal and dust removal in bag type dust collector | |
| CN205903778U (en) | Flue gas purification system | |
| CN102626577B (en) | Method and system for removing inhalable particles | |
| CN103961992A (en) | Air purification device | |
| CN214764544U (en) | SCR catalytic denitration composite set | |
| CN205252893U (en) | Glass smoke pollutants is purifier in coordination | |
| CN108905615A (en) | Smoke processing system and method after a kind of dangerous waste incineration | |
| CN107715693A (en) | A kind of energy-conserving and environment-protective emission reduction device and discharge-reducing method for power plant | |
| CN208711431U (en) | A kind of electrostatic photocatalysis demercuration dust-extraction unit | |
| CN101502737A (en) | Method and device for removing heavy metal mercy in fire coal flue gas by carbon powder treated by brominating process | |
| WO2004080574A1 (en) | Mercury and process for removing mercury from gases | |
| CN110420548A (en) | The device and method of flue gas ammonia process collaboration denitration desulfuration demercuration minimum discharge | |
| CN105935531A (en) | Industrial solid waste cracking burning tail gas treatment method | |
| CN109200784A (en) | A kind of stagewise flue gas demercuration and mercury enriching and recovering system and its working method | |
| CN205979845U (en) | Coal -fired mercury control system | |
| CN205948624U (en) | Industry flue gas dry -type low temperature is in coordination with removing dust SOx/NOx control removal of mercury integrated device | |
| CN108786454A (en) | A kind of electrostatic photocatalysis demercuration dust-extraction unit | |
| CN212348307U (en) | Integrative device of boiler flue gas desulfurization denitration dust removal | |
| CN211799948U (en) | Flue gas purification device of steel sintering machine | |
| CN208727181U (en) | A kind of smoke processing system after dangerous waste incineration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191018 Termination date: 20201010 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |