CN105895183A - Carbon-14-containing waste gas treatment method and system - Google Patents
Carbon-14-containing waste gas treatment method and system Download PDFInfo
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- CN105895183A CN105895183A CN201610255125.8A CN201610255125A CN105895183A CN 105895183 A CN105895183 A CN 105895183A CN 201610255125 A CN201610255125 A CN 201610255125A CN 105895183 A CN105895183 A CN 105895183A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/02—Treating gases
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Abstract
The invention discloses a carbon-14-containing waste gas treatment method and system. The carbon-14-containing waste gas treatment method comprises the following steps: S1, removing H2 in waste gas; S2, converting carbon-14-containing organic matters in the waste gas into CO2; and S3, carrying out absorption treatment on the CO2. The carbon-14-containing waste gas treatment method and system disclosed by the invention are used for treating the carbon-14-containing CO2 and organic matter gas (specially low-concentration gas) and converting and absorbing the carbon-14-containing CO2 and organic matter gas; the conversion efficiency can reach 90% and above; and ppmv-grade carbon-14 matters in original waste gas can be reduced by one order of magnitude or removed, and a phenomenon that the reflexive waste gas is discharged to a nuclear power plant and the surrounding environment so that the health and stability of the environment are influenced is avoided.
Description
Technical field
The present invention relates to nuclear power plant's radioactive emission processing technology field, particularly relate to a kind of waste gas Han carbon-14
Processing method and system.
Background technology
Carbon-14 (14C) having weak beta activity, Beta-ray energy is 49keV, has internal radiation wind
Danger, its half-life is 5730, and core examines the carbon-14 produced in running, on the impact of environment not
Hold and ignore.
As a example by nuclear power plant, produce in nuclear power plant is mainly arranged by the hydrogeneous subsystem of TEG containing carbon-14 waste gas
Put.In the waste gas component of the hydrogeneous subsystem of TEG, N2Content is about 80%, H2Content is about 20%, wherein
The gas concentration containing carbon-14 between 2.9-7.4ppmv, containing Hydrocarbon Organic in carbon-14 gas account for 75%～
95%, CO2Content be 5%～25%.The gas content containing carbon-14 is minimum, for ppm rank, is difficult to have
Effect ground is removed, and then is difficult to avoid that in the environment that reflectivity waste gas is emitted into nuclear power plant and periphery thereof, impact
Environmental Health is stable.
Summary of the invention
The technical problem to be solved in the present invention is, it is provided that a kind of effectively removal waste gas processing method Han carbon-14
And system.
The technical solution adopted for the present invention to solve the technical problems is: provide a kind of exhaust-gas treatment Han carbon-14
Method, comprises the following steps:
S1, the H gone in removing exhaust gas2；
S2, the organic matter containing carbon-14 in described waste gas is changed into CO2；
S3, to CO2Carry out absorption process.
Preferably, in step S1, waste gas is delivered in the airtight container of hydrogen oxygen recombination device, at normal temperature
Under, the H in described waste gas2H is generated with oxygen reaction under the catalysis of noble metal catalyst2O。
Preferably, in step S1, the H that will generate2Described container is discharged in O condensation.
Preferably, in step S2, H will be removed2Waste gas be delivered in airtight catalytic reactor, at height
Under temperature, converting with oxygen reaction under the catalysis of noble metal catalyst containing carbon-14 organic matter in described waste gas
Become CO2。
Preferably, in step S3, by the waste gas that processes through step S2 by Dry absorption unit and/or
Wet absorption unit；
Described Dry absorption unit is to the CO in described waste gas2Absorb, generate carbonate；Described wet type
Absorbing liquid in absorptive unit absorbs the CO in described waste gas2。
Preferably, in step S3, the waste gas processed through step S2 is passed sequentially through Dry absorption unit
With wet absorption unit, or pass sequentially through wet absorption unit and Dry absorption unit；
Described Dry absorption unit is to the CO in described waste gas2Absorb, generate carbonate；Described wet type
Absorbing liquid in absorptive unit absorbs the CO in described waste gas2。
The present invention also provides for a kind of exhaust treatment system Han carbon-14, including removing H in removing exhaust gas2The hydrogen list that disappears
Unit, the organic matter containing carbon-14 in waste gas is changed into CO2Catalytic oxidation unit and to CO2Carry out
The absorptive unit that absorption processes；Described hydrogen unit, catalytic oxidation unit and the absorptive unit of disappearing is carried by waste gas
Direction is sequentially connected with.
Preferably, described in the hydrogen unit that disappears include hydrogen oxygen recombination device, this hydrogen oxygen recombination device include accommodating waste gas,
For the H in waste gas2H is generated with oxygen reaction under noble metal catalyst is catalyzed2The airtight container of O.
Described catalytic oxidation unit includes the heater heated from the described waste gas disappearing hydrogen unit,
And receive from the waste gas after the heating of described heater, for the organic matter Han carbon-14 in waste gas at noble metal
CO is changed into oxygen reaction under catalyst2Catalytic reactor；Described heater disappears described in being connected to
Between hydrogen unit and described catalytic reactor.
Preferably, the hydrogen unit that disappears described in also includes the first cooling that the described waste gas after offseting hydrogen carries out cooling down
Device, described first cooler is connected between described hydrogen oxygen recombination device and heater；
Described catalytic oxidation unit also includes the second cooling cooling down the described waste gas after catalysis oxidation
Device, described second cooler is connected between described catalytic reactor and absorptive unit.
Preferably, described absorptive unit includes Dry absorption unit and/or wet absorption unit；
Described Dry absorption unit is in parallel with wet absorption unit and/or connects.
The present invention containing carbon-14 waste gas processing method and system, for processing the CO containing carbon-142And it is organic
Thing gas (particularly low concentration), by the CO containing carbon-142And organic gas converts and absorbs, transformation efficiency
Can reach 90% and more than, the carbon-14 material of ppmv level contained in script waste gas can be reduced by one
The order of magnitude or removal, it is to avoid reflectivity waste gas is emitted into and have impact on ring in the environment of nuclear power plant and periphery thereof
Border is healthy and stable.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 be the present invention containing carbon-14 waste gas processing method flow chart；
Fig. 2 is the flow chart of dehydrogenation in processing method of the present invention；
Fig. 3 is the flow chart of catalytic oxidation in processing method of the present invention；
Fig. 4 is the structured flowchart containing carbon-14 exhaust treatment system of the present invention；
Fig. 5 is the example structure schematic diagram of hydrogen unit of disappearing in Fig. 4；
Fig. 6 is an example structure schematic diagram of catalytic oxidation unit in Fig. 4；
Fig. 7 is an example structure schematic diagram of absorptive unit in Fig. 4；
Fig. 8 is an example structure schematic diagram of Dry absorption unit in Fig. 7；
Fig. 9 is an example structure schematic diagram of wet absorption unit in Fig. 7.
Detailed description of the invention
In order to the technical characteristic of the present invention, purpose and effect are more clearly understood from, now compare accompanying drawing
Describe the detailed description of the invention of the present invention in detail.
The present invention containing carbon-14 waste gas processing method, for the exhaust-gas treatment of nuclear facilities, remove tool therein
Active carbon-14 (14C)。
As it is shown in figure 1, one embodiment of the invention containing carbon-14 waste gas processing method, it may include following steps:
S1, the H gone in removing exhaust gas2。
Waste gas usually contains N2、H2And trace CH4Deng the organic matter Han carbon-14, this step for the hydrogen that disappears at
Reason, can be realized by the hydrogen unit that disappears.Specifically, with reference to Fig. 2, in step sl, by waste gas and oxygen
It is delivered to after mixing in the airtight container of hydrogen oxygen recombination device 11；At normal temperatures, the H in waste gas2With oxygen
Under the catalysis of noble metal catalyst, reaction generates H2O.Owing to above-mentioned reaction is exothermic reaction, in waste gas
H2Water vapour is generated with oxygen reaction.Oxygen can mix with waste gas before waste gas enters container, it is also possible to is holding
Device mixes with waste gas.
H in waste gas2After abundant water generation reaction steam, the H that will be able to be generated by cooler2(water steams O
Vapour) cooling, steam forms condensed water and separates with waste gas (including waste gas and unreacted oxygen).
Cooler can be connected with hydrogen oxygen recombination device 11, receives from the waste gas of this hydrogen oxygen recombination device 11 and to waste gas
Condensing, separate with waste gas after water vapor condensation, and can discharge, waste gas is the most then delivered to next
Individual step processes.
S2, the organic matter containing carbon-14 in waste gas is changed into CO2。
This step S2 can be carried out in catalytic reactor 21, and this catalytic reactor 21 can pass through conveyance conduit
Hydrogen unit is connected with disappearing, to receive the disappear waste gas after hydrogen and unreacted oxygen.
Specifically, with reference to Fig. 3, in step S2, H will be removed2Waste gas be delivered to airtight catalytic reaction
In device 21, at high temperature (about 350 DEG C), in waste gas containing carbon-14 organic matter such as CH4Urge at noble metal
CO is changed into oxygen reaction under the catalysis of agent2。
Wherein, the entrance point of catalytic reactor 21 can connect heater, removes H2Waste gas first at heater
Form high-temperature gas after inside heating and enter back into catalytic reactor 21.The preferred electric heater of heater is logical
Cross electrically heated mode to be heated by waste gas, be preferably heated up to about 350 DEG C.
Further, step S2 also includes: the waste gas after catalytic reaction is carried out cooling process.Catalysis is anti-
Answer device 21 can connect cooler further, the waste gas after catalytic reaction be delivered to cooler and cool down,
The absorption carrying out next step the most again processes.
S3, to CO2Carry out absorption process.
In this step S3, the main absorbent that passes through is to the CO in waste gas2Carry out absorption process, remove CO2
After waste gas carry out emission treatment again.
This step S3 can be realized by absorptive unit, and absorptive unit includes Dry absorption unit and wet absorption
Unit；The waste gas processed through step S2 can be entered by Dry absorption unit and/or wet absorption unit
Row absorption processes.When exhausted air quantity is less, Dry absorption unit or wet absorption unit can be used independent
Waste gas is carried out absorption process；When exhausted air quantity is relatively big or have an accident operating mode time, dry-and wet-type string can be used
Gang mould formula or dry-and wet-type paralleling model carry out absorption process.
When using dry-and wet-type series model absorption to process, the waste gas processed through step S2 is passed sequentially through dry
Formula absorptive unit and wet absorption unit, waste gas first passes through after Dry absorption unit carries out first order absorption process,
Enter back into wet absorption unit and carry out two grades of absorptions process.Or, through step S2 process waste gas successively
By wet absorption unit and Dry absorption unit, waste gas first passes through wet absorption unit and carries out first order absorption
After process, enter back into Dry absorption unit and carry out two grades of absorptions process.
When using dry-and wet-type paralleling model absorption to process, by the waste gas processed through step S2 respectively by doing
Formula absorptive unit and wet absorption unit carry out absorption process.
Wherein, when waste gas is by Dry absorption unit, Dry absorption unit is to the CO in waste gas2Absorb.
Wherein, CO can be absorbed by solid absorbent2Generate stable carbonate, further also by molecular sieve
Absorb remaining CO2。
When waste gas is by wet absorption unit, the absorbing liquid (alkali lye) in its absorption tower absorbs in waste gas
CO2, remaining waste gas is discharged from absorption tower.CO will be absorbed2Afterwards containing CO3 2-Absorbing liquid be expelled to from absorption tower
Sedimentation basin, generates carbonate deposition and filters, and filters the solution return absorption tower produced and is reused for CO2
Absorption.
By above-mentioned processing method, it is possible to by the CO of carbon-14 in waste gas2And organic gas is (particularly
Low concentration) convert and absorb, transformation efficiency can reach 90% and more than, can be contained in script waste gas
The carbon-14 material of ppmv level reduces an order of magnitude or removal.
As shown in Figure 4, the present invention containing carbon-14 exhaust treatment system, for the exhaust-gas treatment of nuclear facilities,
Remove therein have radioactive carbon-14 (14C).This processing system includes by waste gas conveying direction successively
The hydrogen unit 10 that disappears, catalytic oxidation unit 20 and the absorptive unit 30 connected.
Wherein, hydrogen unit 10 is disappeared for removing the H in removing exhaust gas2, it is by H2H is generated with oxygen reaction2O；
Catalytic oxidation unit 20 by the organic matter containing carbon-14 in waste gas (such as CH4) change into CO2, after being beneficial to
Continuous absorption；Absorptive unit is to the CO in waste gas2Carry out absorption process；Remove CO2After waste gas carry out again
Emission treatment.
In the present embodiment, as it is shown in figure 5, the hydrogen unit 10 that disappears includes hydrogen oxygen recombination device 11, for hydrogen and
The recombination reaction of oxygen.This hydrogen oxygen recombination device 11 includes the airtight container accommodating waste gas.In container,
H in waste gas2H is generated with oxygen reaction under noble metal catalyst is catalyzed2O。
The hydrogen unit 10 that disappears also includes what Hun Yang mechanism 12, Hun Yang mechanism 12 can include being connected with oxygen sources
Oxygen supply pipeline, it is connected between container and oxygen supply source, to be delivered in container by oxygen.Or,
Hun Yang mechanism 12 includes the air chamber that oxygen is carried out mix with waste gas, and air chamber is connected with hydrogen oxygen recombination device 11,
Waste gas is delivered to hydrogen oxygen recombination device 11 again with after oxygen mix wherein.Noble metal catalyst includes palladium, platinum
Deng, it is arranged in container.H in waste gas2H is generated with oxygen reaction under the catalysis of noble metal catalyst2O,
This reaction is exothermic reaction, the H therefore generated2O is Properties of Steam.
The hydrogen unit 10 that disappears may also include the first cooler 13 that the waste gas after offseting hydrogen carries out cooling down further,
The water vapour generated in waste gas is cooled into condensed water, to separate with waste gas.First cooler 13
It is connected between hydrogen oxygen recombination device 11 and catalytic oxidation unit 20, the waste gas (bag of hydrogen oxygen recombination device 11 output
Include waste gas and unreacted oxygen) first pass through this first cooler 13 after enter back into catalytic reaction unit 20,
Steam is separated after condensing in this first cooler 13 from waste gas.
Catalytic oxidation unit 20 includes (waste gas from the hydrogen unit 10 that disappears be may additionally include the hydrogen unit 10 that disappears
In unreacted oxygen) carry out the heater 22 and airtight catalytic reactor 21, the heater that heat
22 are connected to disappear between hydrogen unit 10 and catalytic reactor 21, receive from the hydrogen unit 10 that disappears waste gas also
Waste gas is heated；Waste gas after heating forms high-temperature gas and exports to catalytic reactor 21.In catalysis
In reactor 21, in waste gas containing carbon-14 organic matter under the catalysis of high temperature and noble metal catalyst with oxygen
Reaction changes into CO2.Noble metal catalyst includes palladium, platinum etc., is arranged in catalytic reactor 21.
Specifically, heater 22 is connected between the first cooler 13 and catalytic reactor 21, preferably electricity
Heater, waste gas etc. is heated to about 350 DEG C by electrically heated mode, the highest can be heated to
500℃.At about 350 DEG C, can completely and oxygen reaction changes into CO containing carbon-14 organic matter in waste gas2。
Further, catalytic oxidation unit 20 also includes cool down the waste gas after catalysis oxidation second
Cooler 23, the second cooler 23 is connected between catalytic reactor 21 and absorptive unit 30.Catalysis oxygen
Waste gas after change enters back into absorptive unit 30 after the second cooler 23 is cooled to normal temperature to be carried out at absorption
Reason.
Additionally, heater 22 connects oxygen sources also by oxygen supply pipeline, with guarantee to have sufficient oxygen with
React containing carbon-14 organic matter.
As shown in Figure 6, in an embodiment of absorptive unit 30, Dry absorption unit 31 can be included
And/or wet absorption unit 32.It is anti-that Dry absorption unit 31 and wet absorption unit 32 can be all connected with catalysis
Answering unit 20, the waste gas from catalytic oxidation unit 20 can be separately through Dry absorption unit 31 or wet type
Absorptive unit 32 carries out absorption process.
Additionally, also can connect between Dry absorption unit 31 and wet absorption unit 32, thus can be formed
Parallel connection and/or series connection.Dry absorption unit 31 and the parallel connection of wet absorption unit 32 and/or series model
The valve opening and closing connected on pipeline that can be connected by realization of selection be controlled selecting.
When exhausted air quantity is less, Dry absorption unit 31 or wet absorption unit 32 can be used the most right
Waste gas carries out absorption process；When exhausted air quantity is relatively big or have an accident operating mode time, dry-and wet-type can be used to connect
Pattern or dry-and wet-type paralleling model carry out absorption process.
When using dry-and wet-type series model absorption to process, waste gas passes sequentially through Dry absorption unit 31 and wet type
Absorptive unit 32, waste gas first passes through after Dry absorption unit 31 carries out first order absorption process, enters back into wet type
Absorptive unit 32 carries out two grades of absorptions and processes.Or, waste gas passes sequentially through wet absorption unit 32 and does
Formula absorptive unit 31, waste gas first passes through after wet absorption unit 32 carries out first order absorption process, enters back into dry
Formula absorptive unit 31 carries out two grades of absorptions and processes.
When using dry-and wet-type paralleling model absorption to process, waste gas is respectively by Dry absorption unit 31 and wet type
Absorptive unit 32 carries out absorption process.
As shown in Figure 7,8, as in an embodiment of Dry absorption unit 31, it can include successively
The absorbent bed 311 processing waste gas and absorber 312, also include desorption gas is introduced absorber
312 to carry out the desorption pipeline 313 of desorption and regeneration to absorber 312.
Wherein, absorbent bed 311 has the entrance point for waste gas turnover and the port of export；Absorber 312 has
Adsorb air inlet and absorb gas port, and the desorption air inlet and desorption for the turnover of desorption gas is given vent to anger
Mouthful.Absorbent bed 311 entrance point connects catalytic reaction unit 20, receives waste gas；The outlet of absorbent bed 311
End is connected with the absorption air inlet of absorber 312, and the waste gas processed through absorbent bed 311 absorption is further
Absorber 312 can be entered by the port of export and absorption air inlet, to carry out adsorption treatment, farthest subtract
Few exhaust gas constituents such as CO2Escape.
The entrance point of absorbent bed 311 is provided with the first valve 3110, controls the keying of entrance point.Absorbent bed 311
The port of export also dependent on needs arrange valve to control its open and close.Preferably, absorbent bed 311 is provided with two
Individual and in parallel, one as main absorbent bed, another is as standby absorbent bed.Suction on absorbent bed 311
Receipts agent is solid absorbent, as use one or more compound alkaline metal oxides as absorbent,
Can be with CO2Reaction generates stable carbonate.
The absorption air inlet of absorber 312 connects the port of export of absorbent bed 311, receives from absorbent bed 311
Through absorption waste gas, the gas port that absorbs of absorber 312 is connectable to floss hole, will through absorption
Waste gas after process discharges.Absorber 312 is to use molecular sieve as the absorber of sorbing material.
It is provided with the second valve 3120 at the absorption air inlet of absorber 312, controls the keying of absorption air inlet.Inhale
Absorbing gas port and can also being arranged as required to valve of adnexa 312, controls this keying absorbing gas port.
Desorption pipeline 313 is connected with the desorption air inlet of absorber 312, is delivered to desorption gas inhale
In adnexa 312, absorber 312 is carried out desorption and regeneration.
Desorption pipeline 313 is provided with heater 3131, and desorption gas is heated to desorption temperature, improves
The desorption gas desorption effect to absorber.Wherein, heater 3131 with inlet end towards desorption gas
Body is originated, and desorption gas enters wherein from heater 3131 inlet end, from heater after heated intensification
Outlet side export and enter absorber 312.Preferably, heater 3131 uses electric heater.
The inlet end of heater 3131 is additionally provided with control valve 3133, controls the break-make that desorption carries with gas.
After absorber 312 reaches to adsorb saturation state, control valve 3133 and open, drawn by desorption pipeline 313
Enter desorption gas, absorber 312 is desorbed.
Being additionally provided with the temperature sensor 3132 of detection desorption gas temperature on desorption pipeline 313, temperature passes
Sensor 3132 is positioned at the outlet side of heater 3131.
Further, this Dry absorption unit 31 also includes absorbing pipeline 314 and discharge pipe line 315.Inhale
Closed tube line 314 one end connects the desorption gas outlet of absorber 312, and the other end connects entering of absorbent bed 311
Mouth end, the desorption gas that absorber 312 is desorbed generation is delivered to absorbent bed 311；Discharge pipe line 315 is even
Connect the port of export of absorbent bed 311, the desorption gas after absorber 311 is discharged.CO in waste gas2
Adsorb through absorbing and being adsorbed device 312 after absorption, be desorbed from absorber 312 after desorption,
And it is delivered to absorbent bed 311 by absorption pipeline 314 further, can be by discharge after carrying out re-absorption process
Pipeline 315 discharges.
Discharge pipe line 315 entrance point connects absorbent bed 311, and the port of export is then connected to floss hole；Close on import
It also is provided with on the discharge pipe line 315 of end controlling valve 3150, controls the break-make of discharge pipe line 315.
This Dry absorption unit 31 can be facilitated far-end operation by PLC control system control.
Such as Fig. 7, shown in 9, as in an embodiment of wet absorption unit 32, it can include absorbing
Tower 31 and the sedimentation basin 322 being connected with absorption tower 321.Absorbing liquid (alkali lye) in absorption tower 321
Absorb the CO in waste gas2, it is formed with CO3 2-, remaining waste gas is discharged from top, absorption tower 321；CO will be contained3 2-
Absorbing liquid drain into sedimentation basin 322, generate carbonate deposition and also filter, the solution after filtration can return suction
Receive tower 321 and be reused for CO2Absorption.
Absorption tower 321 include airtight tower body 3211, the absorbed layer 3212 being arranged on tower body 3211 inner bottom part,
It is arranged at least one of which packing layer 3213 above absorbed layer 3212, is arranged on above packing layer 3213
Spraying mechanism 3214 and be arranged on the demister 3215 above spraying mechanism 3214.
Absorbed layer 3212 is used for housing absorbing liquid, by absorbing liquid, waste gas is carried out absorption process.Sedimentation basin
322 connect absorbed layer 3212, can form an absorbing liquid closed circuit between the two, and absorbing liquid is from absorption
Layer 3212 is delivered to be back in absorbed layer 3212 after sedimentation basin 322 carries out precipitation process.Through absorbed layer
Waste gas after absorption processes up flows to packing layer 3213 in tower body 3211, and spraying mechanism 3214 is right
Packing layer 3213 spray-absorption liquid so that the waste gas through packing layer 3213 fully contacts with absorbing liquid again,
Increase waste gas and the time of contact of absorbing liquid and area, reach more preferable assimilation effect.Demister 3215 is right
The absorbing liquid of the waste gas entrained with after packing layer 3213 retains.
Wherein, tower body 3211 is provided with the gas access for waste gas inlet and outlet and gas vent.Gas
Entrance is communicated to absorbed layer 3212, and waste exhaust gases enters absorbed layer 3212 from this gas access.Further,
Being provided with bubbling tracheae 3216 in absorbed layer 3212, this bubbling tracheae 3216 connects gas access, will be useless
Gas is delivered in absorbing liquid in bubbling mode, makes gas be absorbed by liquid absorption in bubbling mode.
Gas vent is positioned at the top of tower body 3211, for sequentially passing through absorbed layer 3212 and packing layer 3213
After waste gas discharge.Demister 3215 be positioned in tower body 3211 spraying mechanism 3214 and gas vent it
Between.Preferably, tower body 3211 top is pyramidal structure, and the waste gas after can absorption being processed is concentrated to gas
Body outlet is with output.
Absorbing liquid entrance and the absorbing liquid outlet being communicated to absorbed layer 3212 it is additionally provided with on tower body 3211, point
Absorbing liquid Yong Yu be delivered in absorbed layer 3212 and absorbing liquid is discharged and change.
Water inlet it is also provided with further, for carrying water to regulate the concentration of absorbing liquid on tower body 3211.
This water inlet is communicated to absorbed layer 3212, and is positioned at the ullage of absorbing liquid.
On tower body 3211, the position of corresponding absorbed layer 3212 is additionally provided with PH and counts (not shown) and/or liquid level
Meter (not shown), it is simple to the pH value of detection absorbing liquid and/or the liquid level of observation absorbing liquid.
Additionally, be additionally provided with at least one observation window 3217 on tower body 3211, in order to observe in tower body 3211
The absorbing state in portion.Preferably, on tower body 3211, the position of corresponding spraying mechanism 3214 is provided with observation window
3217, it is used for observing spray situation.The upper position of tower body 3211 can also be provided with observation window 3217, sees
Examine the gas station after multistage absorption.
Further, absorption tower 321 also includes connecting spraying mechanism 3214 and the circulation of absorbed layer 3212
Pump 3218, by the absorption liquid pump in absorbed layer 3212 to spraying mechanism 3214 to spray, it is achieved inhale
The circulated sprinkling receiving liquid uses, and reduces waste liquid generation amount.Circulating pump 3218 is from absorbed layer 3212 pumping
Absorbing liquid is sprayed to packing layer 3213 through spraying mechanism 3214, and absorbing liquid, can after packing layer 3213
To return in absorbed layer 3212, recycle with this.
As selection, packing layer 3213 includes gripper shoe and filling silk screen on the supporting plate.Silk screen
For having the silk screen of small-bore, it is simple to gas phase and the flowing of liquid phase；Gas and absorbing liquid can be at packing layers 3213
In be fully contacted.
In embodiment illustrated in fig. 9, packing layer 3213 is provided with two-layer, between the upper and lower every setting in tower body 3211
Put；All there is spraying mechanism 3214 that it is carried out spray-absorption liquid on each packing layer 3213.From absorbed layer
3212 out after waste gas sequentially pass through two-layer packing layer 3213 from bottom to top.
Time again as it is shown in fig. 7, Dry absorption unit 31 and wet absorption unit 32 connect, by absorbent bed
311 and absorption tower 321 connect, thus waste gas can first pass through absorbent bed 311 absorb after enter back into absorption tower
321 carry out re-absorption process, or first pass through and enter back into absorbent bed 311 after absorption tower 321 absorbs and carry out
Absorption processes.
Dry absorption unit 31 and wet absorption unit 32 can be facilitated far-end by PLC control system control
Operation.
It is to be appreciated that the present invention's can use giving up containing carbon-14 of the present invention containing carbon-14 waste gas processing method
Gas processing system operation realizes, and reaches the carbon-14 material of ppmv level contained in waste gas is reduced a quantity
Level or the purpose removed, it is to avoid reflectivity waste gas is emitted into and have impact in the environment of nuclear power plant and periphery thereof
Environmental Health is stable.
The foregoing is only embodiments of the invention, not thereby limit the scope of the claims of the present invention, every
Utilize equivalent structure or equivalence flow process conversion that description of the invention and accompanying drawing content made, or directly or
Connect and be used in other relevant technical fields, be the most in like manner included in the scope of patent protection of the present invention.
Claims (10)
1. a waste gas processing method Han carbon-14, it is characterised in that comprise the following steps:
S1, the H gone in removing exhaust gas2；
S2, the organic matter containing carbon-14 in described waste gas is changed into CO2；
S3, to CO2Carry out absorption process.
The most according to claim 1 containing carbon-14 waste gas processing method, it is characterised in that in step S1, waste gas is delivered in the airtight container of hydrogen oxygen recombination device, at normal temperatures, the H in described waste gas2H is generated with oxygen reaction under the catalysis of noble metal catalyst2O。
H the most according to claim 2 containing carbon-14 waste gas processing method, it is characterised in that in step S1, that will generate2Described container is discharged in O condensation.
The most according to claim 1 containing carbon-14 waste gas processing method, it is characterised in that in step S2, H will be removed2Waste gas be delivered in airtight catalytic reactor, at high temperature, described waste gas changes into CO with oxygen reaction containing carbon-14 organic matter under the catalysis of noble metal catalyst2。
The most according to claim 1 containing carbon-14 waste gas processing method, it is characterised in that in step S3, the waste gas processed through step S2 is passed through Dry absorption unit and/or wet absorption unit；
Described Dry absorption unit is to the CO in described waste gas2Absorb, generate carbonate；Absorbing liquid in described wet absorption unit absorbs the CO in described waste gas2。
The most according to claim 1 containing carbon-14 waste gas processing method, it is characterised in that in step S3, the waste gas processed through step S2 is passed sequentially through Dry absorption unit and wet absorption unit, or passes sequentially through wet absorption unit and Dry absorption unit；
Described Dry absorption unit is to the CO in described waste gas2Absorb, generate carbonate；Absorbing liquid in described wet absorption unit absorbs the CO in described waste gas2。
7. an exhaust treatment system Han carbon-14, it is characterised in that include H in removing exhaust gas2The hydrogen unit that disappears, the organic matter containing carbon-14 in waste gas is changed into CO2Catalytic oxidation unit and to CO2Carry out the absorptive unit of absorption process；Described hydrogen unit, catalytic oxidation unit and the absorptive unit of disappearing is sequentially connected with by waste gas conveying direction.
The most according to claim 7 containing carbon-14 exhaust treatment system, it is characterised in that described in the hydrogen unit that disappears include hydrogen oxygen recombination device, this hydrogen oxygen recombination device includes accommodating waste gas, for the H in waste gas2H is generated with oxygen reaction under noble metal catalyst is catalyzed2The airtight container of O；
Described catalytic oxidation unit includes the heater heated from the described waste gas disappearing hydrogen unit, and receives from the waste gas after the heating of described heater, for changing into CO with oxygen reaction containing carbon-14 organic matter under noble metal catalyst is catalyzed in waste gas2Catalytic reactor；Described heater disappears between hydrogen unit and described catalytic reactor described in being connected to.
The most according to claim 8 containing carbon-14 exhaust treatment system, it is characterised in that described in the hydrogen unit that disappears also include that the described waste gas after offseting hydrogen carries out the first cooler cooled down, described first cooler is connected between described hydrogen oxygen recombination device and heater；
Described catalytic oxidation unit also includes the second cooler cooling down the described waste gas after catalysis oxidation, and described second cooler is connected between described catalytic reactor and absorptive unit.
The most according to claim 7 containing carbon-14 exhaust treatment system, it is characterised in that described absorptive unit includes Dry absorption unit and/or wet absorption unit；
Described Dry absorption unit is in parallel with wet absorption unit and/or connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610255125.8A CN105895183B (en) | 2016-04-21 | 2016-04-21 | Carbon containing 14 waste gas processing method and system |
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| CN110702468A (en) * | 2019-09-16 | 2020-01-17 | 清华大学 | Carbon-14 sampling system adopting solid oxidant |
| CN112539978A (en) * | 2020-12-17 | 2021-03-23 | 三门核电有限公司 | Method for obtaining absorption efficiency of nuclear island chimney C-14 sampling device of nuclear power station |
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