CN1064119C - Process for removal of SO2 and NOx from combustion flue gases and apparatus used therefor - Google Patents
Process for removal of SO2 and NOx from combustion flue gases and apparatus used therefor Download PDFInfo
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- CN1064119C CN1064119C CN92103922A CN92103922A CN1064119C CN 1064119 C CN1064119 C CN 1064119C CN 92103922 A CN92103922 A CN 92103922A CN 92103922 A CN92103922 A CN 92103922A CN 1064119 C CN1064119 C CN 1064119C
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 230000008569 process Effects 0.000 title claims abstract description 11
- 238000002485 combustion reaction Methods 0.000 title abstract 3
- 239000003546 flue gas Substances 0.000 title description 2
- 238000010894 electron beam technology Methods 0.000 claims abstract description 42
- 230000005855 radiation Effects 0.000 claims abstract description 26
- 239000007789 gas Substances 0.000 claims abstract description 21
- 239000002912 waste gas Substances 0.000 claims description 46
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 239000003574 free electron Substances 0.000 claims description 14
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 12
- 229910021529 ammonia Inorganic materials 0.000 claims description 6
- 230000005684 electric field Effects 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 239000003337 fertilizer Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 239000000376 reactant Substances 0.000 claims 2
- 239000000446 fuel Substances 0.000 claims 1
- 229910052500 inorganic mineral Inorganic materials 0.000 claims 1
- 230000003993 interaction Effects 0.000 claims 1
- 239000011707 mineral Substances 0.000 claims 1
- 230000000717 retained effect Effects 0.000 abstract 1
- 238000000746 purification Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- 239000002253 acid Substances 0.000 description 7
- 239000012265 solid product Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000005686 electrostatic field Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- -1 dichlorodifluoromethan compound Chemical class 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 206010003084 Areflexia Diseases 0.000 description 1
- HSXSILDVBRDVSP-UHFFFAOYSA-N B.NO Chemical compound B.NO HSXSILDVBRDVSP-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- 238000013142 basic testing Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
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- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
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- 239000004575 stone Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Treating Waste Gases (AREA)
Abstract
The method for the removal of SO2 and NOx from combustion exhaust gases is provided, which is implemented by the action of irradiation of an electron beam and a microwave applied in the form of a continuous wave and/or pulse stream. The exhaust gas stream exposed to the electron beam irradiation in the radiation zone is under the action of microwave energy in the whole cross section of the exhaust gas, so that the 'average power of the electron beam' is reduced in the same dose rate, the cost of accelerators is reduced and while the removal efficiency is retained. Further, a device for the removal of SO2 and NOx from combustion exhaust gases is provided in a radiation process, in which a stream of accelerated electrons and a microwave energy stream are used simultaneously.
Description
The present invention relates to utilize radiation method to remove acid pollution such as SO in the waste gas that thermo-power station particularly produces
2And NO
xMethod, and be used for removing SO from waste gas
2And NO
xDevice.
The caused pollution of gas that derives from the burning of coal and fossil fuel product in the thermo-power station has proposed a global problem.A typical plant generator 500MW will produce approximately per hour 3 to 5 tons pollutant, and they have cumulative adverse effect to surrounding environment.People have developed some technology waste gas have effectively been purified.
Removing acid pollution in the waste gas with some chemical methodes, to be based on acid impurities be absorbability principle in the limewash at alkaline solution.But these moist methods are except only eliminating SO
2Outside, also can cause adhering to of a large amount of byproducts.And a large amount of NO
xStill residue among the waste gas nitric oxide NO particularly, the chief culprit that it and dichlorodifluoromethan compound are considered to cause ozone layer broken hole phenomenon together.So, be necessary to set up separation equipment, remove the NO in the flue gas
xThese equipment are based on different principles, but mainly are based on the principle of catalytic reduction.
Radiotechnology is to utilize the electron beam that is accelerated to produce free root.It can obtain removing simultaneously SO from waste gas
2And NO
xThe result.
Utilize method of radiating can in a set of equipment, eliminate 95% SO
2With 80% NO
xIn radiotechnology, it is very important improving reaction efficiency, and amount, temperature and the composition of admixture of gas depended in these reactions.As described in No. the 284996th, No. the 153259th, Poland Patent and the polish patent application submitted to April 27 nineteen ninety,, can obtain higher reaction efficiency by before carrying out radiation treatment, introducing moisture content and some ammonia.These methods are based on the synchronous reaction that is produced by radiation, and can cause the formation of solid product.These products can be used as chemical fertilizer.
In the situation that the aqueous suspension grain is arranged, the radiation of waste gas can cause the formation of atom and molecule root and free electron.OH ', O ' and H
2O ' root causes SO
2And NO
xBe oxidized to SO
3NO
2, and further exist under the situation of water, form H
2SO
4And HNO
3At last, these compounds and ammonia react, and form solid product NH
4NO
3(NH
4)
2SO
4, these solid products can be used as chemical fertilizer.The temperature of this process remains between 65 ℃ to 100 ℃ the scope.
Optimize and select to depend on gas ingredients and flow the temperature that connects, the program that adds water and ammonia composition, the acid pollution composition is removed in the meeting slight modification from waste gas efficient.
Research has entered into the degree that improves method of radiating efficient.Additional electrostatic field of this improvement utilization and electromagnetism figured stone utilize electrostatic field and electromagnetic field to increase free electron and from the quantity of electric root, change chemical reaction process.
The known method described for patent DD-243-216A (87-170590) number has proposed (except the electron beam with 50-500kev energy) and has utilized its intensity to reduce power consumption in the processing procedure up to the electrostatic field of 100v/cm.In this method, purification efficiency is improved.The shortcoming of this method is to need to install the additional grid electrode in retort.Distance with 16cm between these electrodes are mutual is provided with, and carries out part thereby electric field is introduced reaction.Formed solid product and flying dust will be deposited on the electrode and block retort between radiation era or after the radiation.
The defective of preceding method can be overcome by the disclosed method of patent No. JO-1099-633-A (89-156548/21).In this method, used a kind of radiator pots laser beam (ArF laser), and added CH with 193nm wavelength
3OH.By light stimulus CH
3OH produces OH ' root, they and NO and SO
IIn conjunction with generating solid product, they can be removed.Though use the laser beam effect fine, very complicated and expensive in industrial application.Because the existence of water makes that the penetrance of UV light in retort is very limited, so efficient is quite low.And be difficult to obtain good light beam spatial distribution uniformity, and need to use CH
3The OH compound.
For the equipment of industrially scalable, reducing power consumption is the problem of a particular importance, because in a total electric energy that the power station produced, has 2 percent to four to be consumed in the acid pollution of removing in the waste gas.
Purpose of the present invention is to utilize microwave energy, with electron beam, improves the efficient of purification process, and cuts down the consumption of energy for a little purposes.
The essential characteristic of the method according to this invention is to utilize the free electron of inducting between radiation era once more, among their form drawing-in systems with the electron beam that is accelerated, in order to produce the oxidation root, utilize microwave energy to increase free electron quantity, and make its energy remain in optimum degree.Can cause the reduction of required electron beam average energy under same close rate thus, thereby reduce the cost of accelerator, obtain same removal efficient.
Therefore, the present invention relates to a kind of is to remove SO from waste gas
2And NO
xMethod, wherein waste gas stream is carried out radiation with electron beam, and with evenly, continuously and/or the form of stream of pulses apply microwave.In radiation areas, on its entire cross section, acted on, and microwave is with the electric-field intensity of Ei＞300vcm by microwave energy by the waste gas of electron beam irradiation stream, τ=
-7To 10
-3S's is wide towards length and 200 to 10, and the frequency of 000MH ∑ is introduced.The repetition rate of microwave pulse should be f＞v/ α
k, wherein V is a gas flow rate, α
kBe radiation areas length.
Perhaps, can use an even continuous microwave ENERGY E c stream simultaneously, its intensity can be within 100 to 300v/cm/cm scopes, and frequency is 200 to 10, the 000MH ∑.
Maximum available electron-beam dose is 1-20kGy among the present invention, and dosage is set according to desired result certainly.For example, under the situation of polluting minimizing about 50%, desirable dosage range can be at 5-10kGy.
The electron beam of the employing in the processing also can be a pulsed, and pulse width is τ
e=10
-8To 10
-sS.
Ammonia residual to the waste gas in the retort depends on SO
2And NO
xContent and should have and be about stoichiometric total amount.Water content preferably account for 8-12% volume and can be according to situation optimization at that time in the system.
The further aspect of the present invention relates to and utilizes method of radiating to remove SO in the burnt gas
2And NO
xEquipment, wherein adopt accelerated electron bundle and microwave energy simultaneously.For realizing this purpose, be necessary for retort at least one electron beam source is provided, and at least one microwave source.The set of source of microwave energy and electron beam source is not strict, but must guarantee that electron beam and microwave are introduced in the same area of retort.The microwave energy input port can be arranged on the axis of retort, perpendicular to this or with any suitable angle setting.
The schematic diagram of Fig. 1 for having the example of the retort of concentrating electron beam according to one of the present invention;
Fig. 2 is the plane of Fig. 1;
Fig. 3 is equipped with a linear scanning system for according to the routine view that has the retort example of electron accelerator of the present invention on it;
Fig. 4 is the flow chart according to experimental provision of the present invention.
Before waste gas enters retort, handle (filtering fly ash particle, humidification, injection ammonia) according to the standard procedure of method of radiating.By additional introduce by the conversion zone of electron beam irradiation, its frequency is 200 to 10, the microwave energy of 000MH ∑ will increase the free electron in this zone and the quantity of free root.This helps removing better the acid pollution in the waste gas.The solid product of this process collects by filtration.In these processes, the electric component of microwave energy stream is introduced in the conversion zone of radiation waste gas.Retort is introduced in the input and output that microwave energy is led by worry, and waveguide is fixed on the sidewall of retort and enters the acceleration electron stream.The narrow side that is connected rectangular waveguide is carried out.The equipment that can be provided with two additional waveguides makes purification process more effective.In preferred embodiment, introduce the axis of the microwave energy of retort, but according to particular geometric configuration, it also can be controlled as any other angle perpendicular to retort.As Figure 1-3, microwave energy stream is introduced into retort 4, crosses its sidewall in mode as hereinbefore, is added on the electron beam by waveguide 5, connects in the narrow side of waveguide 5.The existence of microwave energy pulse has caused the increase of free electron and free radical amount under this volume, and this makes purification process more effective.
In order to support the free electron energy, retort 4 and accelerator 1 or 1 ' between electronics output chamber 2 on two additional waveguides 3 have been installed.On the narrow wall of waveguide, realize connecting, waveguide is fixed on two output arms of 3-bB device (microwave distributor), at this, an arm is connected to an adaptive load of microwave (microwave is absorbed and areflexia in this device), and another arm is connected with a microwave generator.This even microwave energy stream can support the free electron energy to participate in this process.Although do not increase and installing electrodes in retort, the present invention produces free root and purification process is more effective than the process in the prior art (Deutsche Bundespatent DD243216 A1).
Except electron beam, also having adopted frequency is 200-10 according to the present invention, the microwave energy stream of 000MH ∑.Waste gas in the porch of retort, with the same in other method of radiating, be no flying dust add tide.Use in the microwave energy bat, owing to have the free electron of a greater number, so increased the quantity of OH ' root.The quantity of free electron is explained by following formula:
n
e=N
Eoe
VitWherein:
n
EoThe free electron number before the microwave energy is used in expression;
v
iThe ionizing collision number of electric-field intensity within the microwave energy pulse is depended in expression; And
T is the time.
The use of microwave pulse has caused the multiplication effect of free electron, and evenly microwave energy stream then remains on the energy of these free electrons on the desired horizontal.
Example
With device shown in Figure 4 the present invention is tested.This SO that from waste gas, removes
2And NO
xWith the device ILU6 accelerator 1 ' the basis on set up.This device by two independently microwave generator finish.It can be to use electron beam and microwave energy stream simultaneously, and producing free root in retort is that principle is removed in the basic test combination.
Two heating furnaces 6 of a water-tube boiler of respectively doing for oneself are used to produce combustion gas.The composition of tested waste gas is by adding as SO in air-flow
2, NO and NH
3The composition of this class and obtaining.
This testing arrangement comprises: input system-be equipped with two boilers of a heating furnace, boiler pressure adjuster, SO
2, NO and NH
3Dosing system, resolving device; A retort, at this, can be at the same time or separately from ILU6 accelerator 1 ' the introducing electron beam, from impulse generator 7 and continuous wave (C, W) generator 8, introduce microwave stream; And output system-isolation ward 9, filter (as bag filter) 10, fan 11, steam vent 12 and resolving device.Several places in steam vent and retort are provided with some temperature sensors, and the flow velocity that passes this testing arrangement is Nm
3/ h.Gas temperature in the retort can be regulated in 70 ℃ to 100 ℃ scopes by the water cooling system of boiler.
Table 1 has provided the basic parameter in accelerated electron beam source and microwave energy stream source.Table 1
The waste gas components that is input in the retort is provided by table 2: table 2
| Parameter | Accelerator | Impulse generator | The continuous wave generator |
| Electron energy frequency repetitive rate peak power pulsewidth mean power | 0.7-2 MeV-Da 50 | -1.886 GHz reach 200 Hz, 10 MW, 5 us, 25 kw | - 2.45 GHz - - - 5 kw |
| Waste gas components | Add composition |
| CO 2 6.1-7.4％ N 2 72.2-74.2％ O 2 7.2-8.0％ H 2O 12.2％ CO 48ppm NO x 39ppm | SO 2Up to 2000 ppm NO up to 2500 ppm NH 3Up to 4500 ppm |
Waste gas is admitted to and is shaped as cylindrical structure, its diameter is in the retort of 200mm.Microwave stream is propagated vertically.Electron beam is introduced in the reaction volume by the axis perpendicular to jar, passes one the 50 thick titanium window of μ m.Microwave energy more than 75% concentrates in the discharge volume.Waste gas flows the sidewall that former input and output mouth is positioned at jar.Air-flow can streamlined flow also can be done circlewise.Temperature at retort exit waste gas is no more than 100 ℃.
Also carried out some tests, SO is eliminated in estimation from waste gas
2And NO
xEfficient, and when microwave stream that mixes with the gas phase that equates and the same purification efficiency of electron beam power level estimation acquisition, only compare the reduction of energy consumption with the situation of utilizing electron beam and microwave energy to combine as continuous wave and/or clock form with electron beam.
Under same power consumption, the efficient of waste gas purification effect is shown in table 3: table 3 under same input power requires, SO
2And NO
xRemove efficient improve A SO
2Remove efficient SO
2(%)
B.NO
xRemove efficiency eta NO
x(%)
| Electron beam | 40 | 50 | 60 | 70 | 80 | 91 | 95 |
| Electron beam+microwave absorbs gross energy (KGy) | 57 1.0 | 66 1.3 | 72 2.1 | 81 2.7 | 89 3.4 | 92 4.6 | 97 5.5 |
It is as follows to be used for the combined required input power of electron beam and microwave:
SO
295%-input power 5.5kGy
NO
x80%-input power 7kGy
Under equal conditions, the minimizing with respect to kGy dosage power demand is shown in following table 4.The so-called equal conditions meaning is that at experimental session, all the parameter about gases used amount and composition and temperature and pressure is all identical.
Table 4RGy dosage reduces
The result of gained shows that this method all is being very valuable aspect purification efficiency and the minimizing power consumption two.
The present invention is defined by appending claims.Under the prerequisite of not leaving spirit of the present invention, may make various modifications.
The present invention shows a kind of in industrial practicality and removes such as SO from the combustion gas of thermo-power station particularly2And NOxWith the method for acid pollution, the present invention utilizes microwave energy, improves the efficient of purification process with electron beam, and reduces for this purpose energy consumption.
Claims (21)
1. from burnt gas, remove SO for one kind
2And NO
xMethod, it is characterized in that comprising the steps: to provide a burner exhaust stream; Shine described burner exhaust stream with electron beam; And with the described burner exhaust stream of microwave radiation irradiation.
2. according to the method for claim 1, the wherein said burner exhaust stream retort of flowing through, described step with electron beam and microwave irradiation occurs in the retort, and this method also is included in burner exhaust stream and enters before the retort to waste gas and flow to a kind of in few humidification and the ammonia.
3. according to the method for claim 1, also comprise collect since electron beam and microwave irradiation make waste gas flow in the formed reactant of chemical substance generation chemical reaction.
4. according to the method for claim 3, also comprise the step that forms chemical fertilizer from reactant.
5. according to the process of claim 1 wherein that the step with microwave radiation irradiation waste gas stream also comprises with pulsed microwave radiation irradiation waste gas stream.
6. according to the method for claim 5, wherein pulsed microwave radiation produces the electric field of an electric-field intensity greater than 300v/cm in waste gas stream, and the pulse length of pulsed microwave radiation is τ=10
-7To 10
-3Second, repetition rate f is greater than ν/α κ, and wherein v is a gas flow rate, and α κ is the length of radiation areas, and in this length, electron beam and microwave radiation and waste gas stream react.
7. according to the process of claim 1 wherein microwave frequency, between the scope of 000MHz at 200-10.
8. according to the method for claim 5, comprise that also wherein the electric-field intensity of continuous microwave generation in waste gas stream is less than 300v/cm with continuous microwave irradiation waste gas stream, the frequency of continuous microwave radiation is 200 to 10, between the 000MHz.
9. method according to Claim 8, wherein continuous microwave radiation, pulsed microwave radiation and electron beam mutual superposition spatially in an overlap-add region of waste gas stream.
10. according to the process of claim 1 wherein mutual superposition in electron beam and the microwave radiation overlap-add region in waste gas stream.
11. according to the process of claim 1 wherein that the step with electron beam irradiation waste gas stream comprises that with pulsewidth be 10
-8To 10
-5The pulsating electronic bundle irradiation waste gas stream of second.
12. according to the method for claim 11, wherein, the step that flows with microwave radiation irradiation waste gas comprises with pulse microwave irradiation waste gas stream; The repetition rate of pulsed electron beam and pulse microwave is synchronous, and pulsed electron beam interacted with waste gas stream before pulse microwave and the interaction of waste gas stream.
13. one kind is used for removing SO from burnt gas
2And NO
xEquipment, it is characterized in that comprising:
Retort with a conversion zone;
Be used to produce the device of electron beam, this device structurally links to each other with retort, makes the electron beam that is produced towards described conversion zone;
Be used to produce the device of microwave, this device links to each other with retort, and the microwave that makes generation is towards described conversion zone;
Be used for the described waste gas Chinese is transferred to the device of retort conversion zone.
14. according to the equipment of claim 13, wherein said transmitting device comprises that one has the pipeline of first and second ports, first port is communicated with conversion zone, and second port is configured to receive reactor off-gas stream from a reactor off-gas stream source.
15., also comprise the reactor off-gas source that produces reactor off-gas stream according to the equipment of claim 14.
16. according to the equipment of claim 15, wherein said reactor off-gas source comprises an electric thermal power generator.
17. according to the equipment of claim 16, wherein, the electric thermal power generator is configured to and can flows to produce waste gas by burning mineral fuel.
18. according to the equipment of claim 13, wherein microwave energy is introduced into conversion zone by a waveguide, the direction of the waste gas stream in the direction of microwave and the conversion zone is vertical.
19. according to the equipment of claim 13, wherein microwave energy is introduced into conversion zone by at least two waveguides.
20. according to the equipment of claim 19, also comprise two additional waveguides that place the relative both sides of electron beam generating apparatus, be used for supporting the free electron of waste gas stream.
21., have microwave window to be used for microwave energy is coupled to conversion zone on the tube wall of wherein said two additional waveguides according to the equipment of claim 20; Also have an output arm to be connected, thereby prevent that microwave reflection from returning the device of generation microwave radiation with a 3DB device.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL230330/1991 | 1991-05-21 | ||
| PL23033091 | 1991-05-21 | ||
| PL290329/1991 | 1991-05-21 | ||
| PL290330/91 | 1991-05-21 | ||
| PL29032991A PL165767B1 (en) | 1991-05-21 | 1991-05-21 | Method of removing so 2 and no x from industrial waste gases |
| PL290329/91 | 1991-05-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1067724A CN1067724A (en) | 1993-01-06 |
| CN1064119C true CN1064119C (en) | 2001-04-04 |
Family
ID=26652948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92103922A Expired - Fee Related CN1064119C (en) | 1991-05-21 | 1992-05-21 | Process for removal of SO2 and NOx from combustion flue gases and apparatus used therefor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1064119C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0847618A (en) * | 1994-06-03 | 1996-02-20 | Ebara Corp | Electron beam irradiation for waste gas treatment |
-
1992
- 1992-05-21 CN CN92103922A patent/CN1064119C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1067724A (en) | 1993-01-06 |
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Granted publication date: 20010404 |