CN201551956U - Treatment device for nitrogen oxidation in waste gas - Google Patents
Treatment device for nitrogen oxidation in waste gas Download PDFInfo
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- CN201551956U CN201551956U CN2009200623632U CN200920062363U CN201551956U CN 201551956 U CN201551956 U CN 201551956U CN 2009200623632 U CN2009200623632 U CN 2009200623632U CN 200920062363 U CN200920062363 U CN 200920062363U CN 201551956 U CN201551956 U CN 201551956U
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- absorption
- waste gas
- tower
- oxidation reaction
- nox contained
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Abstract
The utility model discloses a treatment device for waste gas containing nitrogen oxidation, which utilizes the property that Fe2 is easy to react with NO to generate stable JI-acid site coordination compound and easy to be oxidized by NO2, adopts ferrite solution as an absorbent and utilizes a absorption-oxygen oxidation two-stage circulation method to purify nitrogen oxidation, nitrogen oxidation in waste gas reaches emission standards after being treated, and coagulant trivalent ferric salt or polymeric ferric slat which is generated during treatment can be used for coagulating purification treatment for water, thereby realizing controlling waste by aid of waste and recycling waste truly. The treatment device comprises an absorbing tower, a first circulation pump, an oxidization reaction tower and a second circulation pump which are connected sequentially on the process via a pipeline so as to form a circulation, wherein nitrogen oxidation can be in secondary absorption treatment by ferrous solution in the device, and the ferrous solution can be oxidized secondarily, thereby guaranteeing fine absorption effect.
Description
Technical field
The utility model relates to air environmental pollution and administers the field, is specifically related to a kind of device of handling nitrogen oxides of exhaust gas.
Background technology
Nitrogen oxide (NO
x) pollutant mainly is meant NO and NO
2Mixture, its wide material sources: the burning of fossil dyestuffs such as coal, heavy oil and diesel oil is the largest source of nitrogen oxides pollution thing in the atmosphere, exhaust gas discharged also is one of important source of Pollution Index in Air Nitric Oxides thing in the industry such as nitric acid, nitrogenous fertilizer, gunpowder.In addition, oxidation on metal surface handle and the organic matter nitrifying process in, the also waste gas of the nitrogen-containing oxide that do not wait of concentration of emission.Because NO
xSpecial chemical characteristic adopts general absorption process that it is handled, and often it can not be absorbed fully, and always there is certain density NO in poor effect
xWith exhaust emissions.In the nitrous oxides exhaust gas that discharges in the various process, its concentration differs bigger, from hundreds of～several thousand mg/m
3Not etc., the toxic emission of these nitrogen-containing oxides is in atmosphere, to the pollution of atmospheric environment and very big to the harm of health.
At present, China is for nitrogen oxide NO in the atmosphere
xThe discharge standard of pollutant has been positioned 200～300mg/m
3,, be the major issue that enterprise must solve therefore for the handling problem of nox contained waste gas.
At present, both at home and abroad to the improvement method of nitrogen oxide, mainly contain absorption process (comprise chemical absorbing and prolong absorption etc.), absorption method and catalysis method (comprising selectivity catalysis, non-selective catalysis etc.).
Chemical absorption method has three kinds of alkali absorb method, oxidation absorption process and reduction absorption processes, and wherein, there is the incomplete problem that absorbs in alkali absorb method, and the nitrous oxides concentration in its discharging tail gas is still higher, generally maintains 800～1500mg/m
3, even higher; The oxidation absorption process is with the concentrated sulfuric acid, H
2O
2, potassium bichromate, potassium permanganate etc. have the solution of strong oxidizing property with NO
xIn NO be oxidized to NO
2Or HNO
3And further absorbed, but because of H
2O
2, price such as potassium permanganate is expensive and need add reclaimer etc., the operating cost height is difficult to be used widely industrial; The reduction absorption process mainly adopts the NO in the urea absorption nitric acid tail gas
x, generate N
2Directly discharging.Prolong absorption process and utilize NO
2With H
2The O reaction generates the principle of nitric acid, increases an absorption tower in the back on former absorption tower, increases the oxidation space of tail gas, prolongs oxidization time and the NO of NO
2Soak time, eliminate NO in the tail gas thereby reach
xPurpose, but the assimilation effect of this method is not obvious, can't reach emission request.
Conventional absorption method is utilized the NO in the porous adsorbent absorption nitric acid tail gas
x,, have characteristics such as purification efficiency height, resource recycling, equipment be simple, easy to operate to reach the purpose of purification, but required quantity of sorbent is many, equipment is huge, carry out continued operation then will at least two the above adsorption plant of cover, increased investment cost and operating cost.It is simple that pressure swing adsorption method has technology, easy to operate, the operation of whole device can realize advantages such as control automatically, but the eurytopicity of pressure swing adsorption technique is relatively poor, be subjected to the influence of nitric acid production technology bigger, different nitric acid production tail gas need adopt different pressure swing adsorption techniques.
Selective catalytic reduction can make the NO in the waste gas
xContent is reduced to 600mg/m
3Below, but also have the operating condition strictness, and need to consume a large amount of ammonias, need the problems such as content of ammonia in the strict control tail gas.Non-selective catalytic reduction is to the range of choice broad of reducing agent, reaction temperature higher (being generally 550～850 ℃), and recyclable waste heat, but comparatively responsive to the composition of waste gas, eliminate NO
xEffect is bad, and needs the amount of catalyst very big, generates secondary pollutions such as cyanide easily.
The utility model content
The purpose of this utility model is at the deficiencies in the prior art, provide a kind of fast to nox adsorption speed, uptake is big, technology is simple, the operation require low, operating cost is low, can not produce secondary pollution, and can obtain the chemical products of high added value, the device of handling at nitrogen oxide in the atmosphere.
Above-mentioned purpose of the present utility model is achieved by the following method:
A kind of equipment of handling nitrogen oxides of exhaust gas, this device comprises absorption tower, first circulating pump, oxidation reaction tower and second circulating pump that connects successively by pipeline on flow process, wherein, the leakage fluid dram of bottom, absorption tower is connected with the input of first circulating pump, the first circulation delivery side of pump is connected with the inlet on oxidation reaction tower top, the leakage fluid dram of oxidation reaction tower bottom is connected with the input of second circulating pump, and the second circulation delivery side of pump is connected with the inlet on top, absorption tower.In addition, the bottom on absorption tower and top are respectively equipped with air inlet and the exhaust outlet that is used to import nox contained waste gas, and the upper and lower of oxidation reaction tower is respectively equipped with oxygen air inlet and the exhaust outlet that is used to import oxygen.
Counter-current operation is adopted on above-mentioned absorption tower, and gas enters the absorption tower from the tower body below, upwards flows and discharges from cat head.
The middle part on above-mentioned absorption tower is provided with filler or column plate, the bottom of filler or column plate is provided with the absorption chamber that is used to store absorption liquid (ferrous iron solution), the air inlet of nox contained waste gas is arranged on the absorption chamber position of tower body, when the waste gas of nitrogen-containing oxide when air inlet enters, just enter into absorption chamber, absorption reaction takes place rapidly in ferrous iron solution in the absorption chamber and nitrogen oxide, the waste gas of nitrogen-containing oxide moves upward and enters in filler or the column plate then, continue reaction with absorption liquid from cat head, make that those nitrogen oxide that do not absorbed fully at absorption chamber continue to be absorbed in the waste gas, and the liquid that is absorbed with nitrogen oxide in the absorption chamber then flows out by first circulating pump from the absorption tower leakage fluid dram and introduces the oxidation reaction tower.
The middle part of above-mentioned oxidation reaction tower is provided with filler or column plate, tower body top is provided with the oxygen air inlet, when absorption liquid when the inlet on oxidation reaction tower top enters, oxygen also enters from air inlet, the oxidation reaction of solution-air just takes place at filler or column plate place, the leakage fluid dram of oxidation liquid by filler or column plate at the bottom of the tower discharged, introduce the absorption tower by second circulating pump, enter from the inlet on top, absorption tower, pass through the filler or the column plate on absorption tower then, meet with the nox contained waste gas that purifies through absorption liquid, still contain a large amount of ferrous ion in the oxidation liquid this moment, so with nitrogen oxide absorption reaction for the second time takes place.When the waste gas of nitrogen-containing oxide reaches cat head, passed through absorption reaction twice, the concentration of nitrogen oxide wherein is less than 50mg/m
3, reach discharge standard fully, arrange to the external world from exhaust outlet.
The air inlet place on above-mentioned absorption tower can also be provided with a gas pipe, thereby it is more even to make that nox contained waste gas distributes in absorption liquid, and assimilation effect is better.
The inlet place on above-mentioned absorption tower can be provided with a sprinkle shower nozzle, thereby it is more even to make that oxidation liquid distributes in filler or column plate, and is wider with the nox contained waste gas contact-making surface.
In order to make oxidation reaction more abundant, the venturi-type eductors of can also between the inlet of the first circulation delivery side of pump and oxidation reaction tower, connecting, the inlet of venturi-type eductors upper end is connected by pipeline with first circulating pump, the liquid outlet of venturi-type eductors lower end is connected by pipeline with the inlet of oxidation reaction column overhead, the top of venturi-type eductors is provided with air inlet, oxygen can be from entering the injector here, when the absorption liquid of discharging when the absorption tower is introduced venturi-type eductors by first circulating pump, oxygen also enters from air inlet, the oxidation reaction of gas one liquid for the first time takes place in absorption liquid and oxygen, the inlet that oxidation liquid is discharged by the oxidation reaction tower from leakage fluid dram enters, from top to bottom by filler or column plate, this moment, the air inlet of oxidation reaction tower also had oxygen to enter, oxygen is also from top to bottom by filler or column plate, solution-air oxidation reaction for the second time takes place in filler or column plate this moment, and the leakage fluid dram at the bottom of the tower of the oxidation liquid by filler or column plate is discharged.Since twice oxidation reaction, [Fe (NO)] in the absorption liquid
2+Generated trivalent iron salt under the effect of oxidant, the new NO that produces also gradates under the effect of oxidant and is NO in the reaction
3 -, the ferrous ion in the absorption liquid also can be oxidized to ferric ion simultaneously.
The tower body place, bottom of the filler of above-mentioned oxidation reaction tower or column plate can also be provided with a gas outlet, this gas outlet is connected with the air inlet of venturi-type eductors, thereby because the oxygen of oxidation reaction tower must be capacity guarantee oxidation reaction fully, therefore oxygen is after passing through filler or column plate, also have a large amount of residues, enter once more in the venturi-type eductors form recycling.
The filler of above-mentioned oxidation reaction tower or the top of column plate, a sieve plate can also be set, carry out oxidation reaction from first sieve plate, the contact of cat head oxidation liquid that enters and the oxygen that enters from air inlet, because the special tectonic of sieve plate, thereby can make the solution-air haptoreaction more abundant.
Regularly the absorption liquid in the absorption chamber of absorption tower is detected,, need to change fresh absorption liquid or add the solid ferrous salt, improve the ferrous content in the absorption liquid, strengthen assimilation effect if ferrous ion concentration is lower than at 0.5% o'clock in the absorption liquid; Be rich in ferric ion and change the absorption liquid that comes out, then can be used as the coagulation purified treatment that water purification agent is used for sewage.
The absorption chamber place on above-mentioned absorption tower can also be provided with an automatic detection device of being convenient to observe, need not manually regularly to extract absorption liquid from absorption chamber detects, directly pass through the external observation window of automatic detection device, just can know the concentration situation of ferrous ion in the absorption liquid intuitively, thereby be convenient to the replacing of absorption liquid more.
In the said apparatus, according to the concentration height (tens ppm～several thousand ppm) of nitrogen oxides of exhaust gas and the requirement of processing back discharge standard, the absorption tower can be provided with a cover, also can be provided with two the cover or two the cover more than connect, to guarantee that nitrogen oxide reaches emission request in the gas that absorbs after handling; In like manner, the oxidation reaction tower also can be provided with a cover or the series connection of a few cover.
In the said apparatus, absorption tower and oxidation reaction tower also can be corrosion resistant absorption still or oxidizing reactor, and absorption tower and oxidation reaction tower can also be selected various reaction tower or the reactor of being convenient to improve the solution-air contact area and strengthening mass transfer for use.
In the said apparatus, in order to strengthen gas-liquid reaction, also can take to strengthen the mass transfer means, as add strong mixing, spray, injection and increase filler etc.,, accelerate to absorb and oxidation reaction speed to increase the gas-liquid contact area.
In the said apparatus, the filler or the column plate at the filler at middle part, absorption tower or column plate and oxidation reaction tower middle part all are to provide a good sufficient reacting environment for gas-liquid reaction, therefore those skilled in the art's used any filler or column plate in absorption tower, reaction tower and destilling tower or the like may be used to the present invention, realizes the present invention.
In the said apparatus, the below of filler or column plate is provided with the absorption chamber that is used to store absorption liquid in the absorption tower.
In the said apparatus, the outside of absorption chamber is provided with automatic monitoring device.
In the said apparatus, also be in series with a venturi-type eductors between the inlet of the first circulation delivery side of pump and described oxidation reaction tower, this venturi-type eductors top be provided with the oxygen air inlet.
In the said apparatus, the oxygen exhaust outlet of oxidation reaction tower bottom is connected with the oxygen air inlet of described venturi-type eductors.
In the said apparatus, the air inlet place on absorption tower is provided with gas pipe.
In the said apparatus, the inlet place on top, absorption tower is provided with shower nozzle.
Compared with prior art, the utlity model has following beneficial effect:
1. the Fe that utilizes of the present utility model
2+Be easy to form more stable Л-acid position complex with NO, and Fe
2+Be easy to by NO
2The character of oxidation adopts ferrous salt solution as absorbent, by two sections round-robin methods of absorption-dioxygen oxidation, the nitrogen oxide in the nox contained waste gas is carried out purified treatment;
2. the utility model has not only been realized purified treatment to nitrogen oxides from exhaust gas, make processing back nitrogen oxides of exhaust gas reach discharge standard, and the coagulant trivalent iron salt or the polymeric ferric salt product that obtain having good purifying water effect in the processing procedure and have the very strong market competitiveness, the coagulation purified treatment that is used for water, really realize the purpose of " treatment of wastes with processes of wastes against one another, turn waste into wealth ", produced good economy and environmental benefit;
3. the utility model adopts common absorption tower and oxidation reaction tower to connect, and equipment is simple, and can realize the recycling of ferrous iron solution and oxygen, and by secondary absorption reaction and secondary oxidation reaction, has improved clean-up effect;
4. the utility model adopts ferrous salt solution as absorbent, the ferrous salt solution wide material sources.Both can be titanium dioxide byproduct ferrous sulfate, also contain the iron and steel pickling waste liquid of ferrous sulfate, frerrous chloride.It is wide material sources not only, and price is very cheap.Therefore, this method treatment and purification nitrogen oxide also has the low characteristic of operating cost.
Description of drawings
Fig. 1 is the structural representation of nox contained waste gas treating apparatus.
The specific embodiment
Below in conjunction with specific embodiment the utility model is done description further, but specific embodiment is not done any qualification to the utility model.
As shown in Figure 1, absorption tower 1, first circulating pump 3, oxidation reaction tower 2 is connected on flow process by pipeline successively with second circulating pump 4, wherein, the top on absorption tower 1 is provided with inlet 111 and exhaust outlet 121, the middle part on absorption tower 1 is provided with filler 16 (or column plate), the below of filler 16 (or column plate) is provided with the absorption chamber 13 that is used to store ferrous iron solution, the bottom on absorption tower 1 is provided with nox contained waste gas air inlet 122, air inlet 122 is positioned at the tower body part of absorption chamber 13, the bottom on absorption tower 1 is provided with leakage fluid dram 112, and leakage fluid dram 112 is connected by the input of pipeline with first circulating pump 3.
Also be in series with a venturi-type eductors 5 between the inlet of the output of first circulating pump 3 and oxidation reaction tower 2.
The inlet 51 of the output of first circulating pump 3 and venturi-type eductors 5 upper ends is connected by pipeline, and the top of venturi-type eductors 5 also is provided with oxygen air inlet 52, and the lower end of venturi-type eductors 5 is connected with the inlet 211 of oxidation reaction tower 2.
The top of oxidation reaction tower 2 also is provided with oxygen air inlet 221, the middle part of oxidation reaction tower 2 is provided with filler 24 (or column plate), the bottom of oxidation reaction tower 2 is provided with gas outlet 222, the bottom of oxidation reaction tower 2 is provided with leakage fluid dram 212, and leakage fluid dram 212 is connected by the input of pipeline with second circulating pump 4.
The output of second circulating pump 4 is connected by the inlet 111 on pipeline and absorption tower 1.
Inlet 111 places on absorption tower 1 also are provided with shower nozzle 14, also are provided with gas pipe 15 in the absorption chamber 13 on absorption tower 1.
Filler 24 (or column plate) top of oxidation reaction tower 2 is provided with sieve plate 23, and the gas outlet 222 of oxidation reaction tower 2 is connected with the oxygen air inlet 52 of venturi-type eductors 5.
The workflow of nitrogen oxide processing method of the present invention and device thereof is as follows:
It is 0.5～16% copperas solution that configuration contains the ferrous ion mass percent concentration, gets 1000 parts of this solution and inserts in the absorption chamber 13 on absorption tower 1.
With nitrogen-containing oxide concentration is 50～8000mg/m
3Industrial waste gas enter absorption tower 1 through air inlet 122, industrial waste gas fully is diffused under the effect of gas pipe 15 in the copperas solution, absorption reaction takes place in moment, gas makes progress away and enters filler then.
Liquid in the absorption chamber 15 is discharged by leakage fluid dram 122, effect through first circulating pump 3, enter from the inlet 51 of venturi-type eductors 5, the oxygen air inlet 221 of oxidation reaction tower 2 has been imported a large amount of oxygen at this moment, and through the gas outlet 222, enter and absorption reaction liquid carries out the solution-air oxidation reaction rapidly from the oxygen air inlet 52 of venturi-type eductors 5.
Oxidation liquid is discharged from venturi-type eductors 5 and is entered oxidation reaction tower 2 by inlet 211, at sieve plate 23 places just and the oxygen generation solution-air oxidation reaction that enters from oxygen air inlet 221, this reaction continues up to filler 24 (or column plate) and locates, from the oxidation liquid that filler 24 (or column plate) comes out, [Fe (NO)]
2+Generated trivalent iron salt under the effect of oxidant, the new NO that produces also gradates under the effect of oxidant and is NO in the reaction
3 -Part ferrous ion in the absorption liquid also has been oxidized to ferric ion simultaneously, but still contain a large amount of ferrous ions in this oxidation liquid, therefore this liquid is discharged through leakage fluid dram 212, effect via second circulating pump 4,1 inlet 111 enters from the absorption tower, shower nozzle 14 with spray liquid on filler 16 (or column plate), liquid meets with the nox contained waste gas that passes through absorption reaction processing for the first time in filler 16 (or column plate), ferrous ions a large amount of in the liquid carry out secondary absorption reaction processing to this waste gas, when gas reached 1 top, absorption tower, the concentration of its nitrogen-containing oxide was less than 50mg/m
3, the complete allow compliance with emission standards of this concentration, therefore 1 exhaust outlet 121 is discharged to the external world from the absorption tower.
In the above-mentioned oxidation reaction tower 2, in the gas through filler 24 (or column plate), main component is an oxygen, also has minor N O (generating in the reaction), this gas is discharged from exhaust outlet 222, enter from the air inlet 52 of venturi-type eductors 5, absorption reaction liquid is carried out oxidation, the NO in the gas is oxidized to NO gradually
3 -Thereby, realized the recycling of oxygen.
Liquid in the absorption chamber 13 is detected, be lower than at 0.5% o'clock, just the liquid in the absorption chamber is taken out, be rich in three tame iron ion and nitrate ions in this liquid, can be used for the coagulation purified treatment of sewage if find the mass percent concentration of ferrous ion in the liquid; In absorption chamber, change the fresh absorption liquid that is rich in ferrous ion simultaneously.
Claims (10)
1. the treating apparatus of a nox contained waste gas is characterized in that, this device comprises absorption tower, first circulating pump, oxidation reaction tower and second circulating pump that connects successively by pipeline on flow process, forms circulation.
2. the treating apparatus of a kind of nox contained waste gas according to claim 1, it is characterized in that, the leakage fluid dram of bottom, described absorption tower is connected with the input of first circulating pump, the first circulation delivery side of pump is connected with the inlet on oxidation reaction tower top, the leakage fluid dram of oxidation reaction tower bottom is connected with the input of second circulating pump, the second circulation delivery side of pump is connected with the inlet on top, absorption tower, in addition, the bottom on absorption tower and top are respectively equipped with air inlet and the exhaust outlet that is used to import nox contained waste gas, and the upper and lower of oxidation reaction tower is respectively equipped with oxygen air inlet and the exhaust outlet that is used to import oxygen.
3. the treating apparatus of a kind of nox contained waste gas according to claim 1 is characterized in that, the middle part on described absorption tower is provided with filler or column plate, and the middle part of described oxidation reaction tower is provided with filler or column plate.
4. the treating apparatus of a kind of nox contained waste gas according to claim 3 is characterized in that, the below of filler or column plate is provided with the absorption chamber that is used to store absorption liquid in the described absorption tower.
5. the treating apparatus of a kind of nox contained waste gas according to claim 4 is characterized in that, the outside of described absorption chamber is provided with automatic monitoring device.
6. the treating apparatus of a kind of nox contained waste gas according to claim 3 is characterized in that, the filler of described oxidation reaction tower or column plate top are provided with sieve plate.
7. the treating apparatus of a kind of nox contained waste gas according to claim 2, it is characterized in that, also be in series with a venturi-type eductors between the inlet of described first circulation delivery side of pump and described oxidation reaction tower, this venturi-type eductors top be provided with the oxygen air inlet.
8. the treating apparatus of a kind of nox contained waste gas according to claim 7 is characterized in that, the oxygen exhaust outlet of described oxidation reaction tower bottom is connected with the oxygen air inlet of described venturi-type eductors.
9. the treating apparatus of a kind of nox contained waste gas according to claim 2 is characterized in that, the air inlet place on described absorption tower is provided with gas pipe.
10. the treating apparatus of a kind of nox contained waste gas according to claim 2 is characterized in that, the inlet place on top, described absorption tower is provided with shower nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200623632U CN201551956U (en) | 2009-08-14 | 2009-08-14 | Treatment device for nitrogen oxidation in waste gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200623632U CN201551956U (en) | 2009-08-14 | 2009-08-14 | Treatment device for nitrogen oxidation in waste gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201551956U true CN201551956U (en) | 2010-08-18 |
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ID=42611628
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|---|---|---|---|
| CN2009200623632U Expired - Fee Related CN201551956U (en) | 2009-08-14 | 2009-08-14 | Treatment device for nitrogen oxidation in waste gas |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102989302A (en) * | 2012-09-12 | 2013-03-27 | 河南绿典环保节能科技有限公司 | Smoke wet oxidation denitration method |
| CN103331091A (en) * | 2013-08-14 | 2013-10-02 | 如皋市金陵化工有限公司 | Nitrogen oxide absorption process |
| CN103877830A (en) * | 2014-03-05 | 2014-06-25 | 江苏盛世水业发展有限公司 | NO2 waste gas treatment method |
| CN109381970A (en) * | 2018-11-15 | 2019-02-26 | 江门市佐敦环保科技有限公司 | A kind of ammonia processing system and method based on venturi principle |
| CN112691618A (en) * | 2019-10-22 | 2021-04-23 | 中国石油化工股份有限公司 | Gas-liquid reaction apparatus and denitration method |
-
2009
- 2009-08-14 CN CN2009200623632U patent/CN201551956U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102989302A (en) * | 2012-09-12 | 2013-03-27 | 河南绿典环保节能科技有限公司 | Smoke wet oxidation denitration method |
| CN103331091A (en) * | 2013-08-14 | 2013-10-02 | 如皋市金陵化工有限公司 | Nitrogen oxide absorption process |
| CN103877830A (en) * | 2014-03-05 | 2014-06-25 | 江苏盛世水业发展有限公司 | NO2 waste gas treatment method |
| CN103877830B (en) * | 2014-03-05 | 2015-12-30 | 江苏盛世水业发展有限公司 | A kind of containing NO 2the processing method of waste gas |
| CN109381970A (en) * | 2018-11-15 | 2019-02-26 | 江门市佐敦环保科技有限公司 | A kind of ammonia processing system and method based on venturi principle |
| CN112691618A (en) * | 2019-10-22 | 2021-04-23 | 中国石油化工股份有限公司 | Gas-liquid reaction apparatus and denitration method |
| CN112691618B (en) * | 2019-10-22 | 2022-12-13 | 中国石油化工股份有限公司 | Gas-liquid reaction apparatus and denitration method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100818 Termination date: 20130814 |