CN1090047C - Waste gas denitration method and device thereof - Google Patents
Waste gas denitration method and device thereof Download PDFInfo
- Publication number
- CN1090047C CN1090047C CN98106678A CN98106678A CN1090047C CN 1090047 C CN1090047 C CN 1090047C CN 98106678 A CN98106678 A CN 98106678A CN 98106678 A CN98106678 A CN 98106678A CN 1090047 C CN1090047 C CN 1090047C
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- ammonia
- exhaust gas
- feed rate
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- waste gas
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000002912 waste gas Substances 0.000 title claims description 26
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 168
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 84
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000007789 gas Substances 0.000 claims abstract description 37
- 238000002485 combustion reaction Methods 0.000 claims abstract description 28
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 9
- 239000003054 catalyst Substances 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 7
- 239000003546 flue gas Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000003570 air Substances 0.000 description 42
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 30
- 238000005259 measurement Methods 0.000 description 27
- 230000008676 import Effects 0.000 description 7
- 238000012886 linear function Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- SBOJXQVPLKSXOG-UHFFFAOYSA-N o-amino-hydroxylamine Chemical compound NON SBOJXQVPLKSXOG-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 238000004176 ammonification Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000009331 sowing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Treating Waste Gases (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
An exhaust gas denitration method and apparatus therefor are disclosed in the invention. Gaseous ammonia which is the reducing agent of nitrogen oxide is supplied from an ammonia supply device to an exhaust gas of an internal combustion engine, which ammonia supply device is mounted in the midst of an exhaust gas duct to exhaust the exhaust gas to the outside and a absolute humidity and/or temperature measuring device to measure the absolute humidity and/or temperature of combustion air of the internal combustion engine is provided on the downstream side of the ammonia supply device. Signal from the measuring device is transferred to the control units to control ammonia supply speed in the ammonia supply device.
Description
The present invention relates to method of denitration, thereby this method is removed the nitrogen oxide in the engine exhaust gas by adding as the ammonia of reducing agent in waste gas.The present invention also relates to be used to implement the device of this method of denitration.More particularly, the present invention relates to method of denitration, wherein the ammonia amount of determining by nitrogen oxides of exhaust gas concentration is added in the waste gas, also relates to the device that is used for such method of denitration.This method and apparatus is fit to the denitration to diesel exhaust.
The waste gas nitrogen-containing oxide of internal combustion engine.If waste gas is discharged into as at present in the atmosphere, atmosphere is with contaminated.Therefore, must handle waste gas to remove wherein nitrogen oxide.Handle the waste gas typical method and be ammonia is added to making itself and waste gas reaction in the waste gas, whereby nitrogen oxide is reduced into nitrogen.Required ammonia amount of this processing and nitrogen oxide are stoichiometric amounts.Because ammonia itself is harmful substance, common way is that the charging of control ammonia is inexcessive.
Up to the present, the control of injecting at exhaust gas denitration device ammonia is promptly according to engine start and the stop signal received from startup-halt signal generator by such method, opening and closing ammonia introduction valve, or such method is promptly opened when the EGT in the Benitration reactor becomes the most suitable denitration reaction, and valve carries out.
Yet, because can not accurately control the ammonia feed rate by simple opening and closing valve according to the amount of the nitrogen oxide that produces based on above-mentioned condition, thus can not satisfy discharge standard, and have the danger of the discharge increase of unreacted ammonia.
In these cases, invented a kind of method, wherein controlled the ammonia feed rate by the amount of the nitrogen oxide that produces.But this method is a calculating optimum ammonia feed rate, must ceaselessly measure nitrous oxides concentration, exhausted air quantity etc., therefore requires to keep as the adjusting of NOx measurement device and the cleaning of gas coupon line, and the result causes implementing cost and rises.
As other control method, a kind of method is arranged before this, wherein the ammonia feed rate control according to engine load and a kind of device wherein sequencer must learn essential ammonia feed rate in advance according to engine load so that carry out ammonia charging control effectively.It is disclosed in the Japanese patent application (disclosing) 2-223623 number.But owing to the reason complexity that nitrogen oxide produces, these traditional methods can not suitably be controlled the charging of ammonia, and itself and the amount of nitrogen oxides that is produced are mated satisfactorily.
Therefore, wish a kind of method that can suitably control the ammonia feed rate of exploitation, described control is to realize by finding out the closely related and factor the easiest measurement of amount of nitrogen oxides in some and the engine exhaust gas.
The objective of the invention is to overcome in the prior art method ammonia charging and can not suitably control this shortcoming, and a kind of method of denitration is provided, this method is by using the easiest measurement and can suitably controlling the charging of ammonia with the maximally related factor of nitrogen oxides of exhaust gas amount.
For addressing the above problem, the relation between factor and the nitrogen oxides of exhaust gas concentration of making preparations for sowing that the inventor has utilized the exhaust gas denitration equipment research, wherein the apparatus for feeding as the ammonia of NOx reducing agent is installed in the engine exhaust gas pipe.
The inventor has studied in amino-oxide concentration under the constant condition of engine load and temperature of inlet air and has been used for relation between the absolute humidity (it can be considered to one of parameter that influences nitrous oxides concentration) of the air intlet of combustion in IC engine.As a result, the inventor finds that absolute humidity and nitrous oxides concentration are closely related, therefore nitrous oxides concentration can be expressed as the linear function (as shown in Figure 2) of air intlet absolute humidity.Like this, because work as amount one timing of waste gas, amount of nitrogen oxides is directly proportional with nitride concentration, so the amount of nitrogen oxide also is directly proportional with air intlet absolute humidity.The inventor has also studied the relation between nitrous oxides concentration under the constant condition of engine load and air intlet absolute humidity and temperature of inlet air (it is the same with air intlet absolute humidity to be considered to one of parameter that influences nitrous oxides concentration).Found that temperature of inlet air and nitrous oxides concentration are closely related, therefore nitrous oxides concentration might be expressed as the linear function (as Fig. 3) of temperature of inlet air.
That finishes based on above-mentioned discovery the present invention includes following means:
(1) exhaust gas denitration method wherein adds ammonia as NOx reducing agent at waste discharge gas in the waste gas of internal combustion engine to the flue gas leading of outside middle part, the waste gas that is added with ammonia through removing nitrogen oxide catalyst with its reaction, this method comprises that the absolute humidity of the air intlet that is used for combustion in IC engine controls the ammonia feed rate that is added to waste gas as one of variable.
(2) at the exhaust gas denitration method described in (1), the further temperature of inlet air that is used for combustion in IC engine of feed rate that wherein is added to ammonia in the waste gas is controlled as a variable.
(3) exhaust gas denitration method, wherein in engine exhaust gas, add ammonia to the flue gas leading of outside middle part as NOx reducing agent at waste discharge gas, the described waste gas that is added with ammonia through removing nitrogen oxide catalyst with its reaction, described method comprises that the temperature of inlet air that is used for described combustion in IC engine controls the feed rate that is added to described waste gas ammonia as one of variable.
(4) exhaust gas denitration device, it comprises the apparatus for feeding as the ammonia of NOx reducing agent, this equipment is installed in row's engine exhaust gas to outside flue gas leading middle part, with the reactor that comprises the catalyst of removing nitrogen oxide, this reactor is installed in ammonia apparatus for feeding downstream, and this device comprises the equipment of measuring the air intlet absolute humidity that is used for combustion in IC engine; With equipment according to ammonia feed rate in the signal controlling ammonia apparatus for feeding of measurement device.
(5) at the exhaust gas denitration device described in (4), this device also comprises the equipment of measuring the temperature of inlet air that is used for combustion in IC engine; With equipment according to ammonia feed rate in the signal controlling ammonia apparatus for feeding of humidity measuring device and temperature measurement equipment.
(6) exhaust gas denitration device, it comprises the ammonia apparatus for feeding as NOx reducing agent, this equipment is installed in row's engine exhaust gas in the flue gas leading of outside, with the reactor that contains nitrogen oxide catalyst, this reactor is installed in ammonia apparatus for feeding downstream, and this device comprises the equipment of measuring the temperature of inlet air that is used for combustion in IC engine; With the equipment of in the ammonia apparatus for feeding, controlling the ammonia feed rate according to the signal of this measurement device.
In the present invention, air intlet absolute humidity or the temperature by using the as easy as rolling off a log measurement of absolute humidity commonly used or temperature measurement equipment to be used to burn.Because measuring thing is air, the measurement device of absolute humidity or temperature can not be contaminated.In addition, because the absolute humidity of air intlet or temperature are identical with the internal combustion engine ambient air, do not measure and need in the control inlet tube, carry out, and can carry out near near the internal combustion engine or the appropriate location the inlet tube inlet part.
The ammonia feed rate is according to the measurement variation of air intlet absolute humidity and/or temperature in the ammonia apparatus for feeding.If the ammonia feed rate is pressed the absolute humidity measurement variation, it changes by correlation shown in Figure 2.In reality is implemented, air intlet absolute humidity is to measure with the absolute humidity measurement device that moisture detector is housed, for example, the signal of absolute humidity measurement device is sent to control appliance that computing unit the is housed opening degree with the control flow control valve, controls the ammonia feed rate whereby.
In above-mentioned research to the various factors relevant with nitrous oxides concentration in the engine exhaust gas, show increase with engine load, because exhausted air quantity increases,, amount of nitrogen oxides also increases so being the product of nitrous oxides concentration and exhausted air quantity.Therefore, engine load has than higher relevance (as shown in Figure 4) with amount of nitrogen oxides, but this relevance is still very discrete.But find when each load that amount of nitrogen oxides is expressed as internal combustion engine and during as the linear function of the import absolute humidity of the above-mentioned control that is used to burn, this correlation has very high precision, i.e. the required ammonia amount of denitration can be controlled by the linear function of the import absolute humidity of engine load and combustion air.According to this method,, might realize ammonia feed rate control more accurately so compare with situation about controlling according to single engine load because the variation of the import humidity of the air that is used to burn that influences nitrous oxides concentration is also followed the tracks of.
In addition, as shown in Figure 3, because nitrous oxides concentration is linear with the temperature of inlet air that is used to burn in the engine exhaust gas, amount of nitrogen oxides can be expressed as the engine load and the function of the inlet temperature of combustion air as mentioned above.Therefore, the amount of the required ammonia of denitration can be controlled by the linear function of the inlet temperature of engine load and combustion air.By this method,, might realize ammonia feed rate control more accurately so compare with situation about controlling according to single engine load because the variation of the inlet temperature of combustion air is also followed the tracks of.
If utilize the import absolute humidity of combustion air and temperature (the two can be used as ammonia feed rate governing factor) to control, might realize controlling more accurately.In this control method, engine load also is used as governing factor.
In method of denitration and equipment based on above-mentioned means, do not need expensive and NOx measurement device that require frequent maintenance, denitration can only utilize the equipment of measuring temperature and/or humidity to carry out.In addition, because the detector of these measurement devices does not need to be installed in the waste gas, thereby there is not the contaminated danger of measurement device.
As for for implementing method of denitration of the present invention and the required Benitration reactor of device, be used for catalyst wherein, measurement device, control appliance etc., known all can use.The object lesson of denitrification apparatus will be explained in the description of embodiment.Suitable treatment engine exhaust gas of the present invention such as large-sized internal combustion engine, waste gas wherein carries out denitration by ammonification.
As mentioned above, be used for the import absolute humidity of air of combustion in IC engine and temperature and engine exhaust gas nitrous oxides concentration very high relevance and linear with nitrogen oxide is arranged.Therefore, the feed rate of ammonia can utilize these factors to control.
Above and other objects of the present invention, feature and advantage will can become clearer from following description taken together with the accompanying drawings, wherein embodiment preferred provides by illustrative example.
Fig. 1 shows the exhaust gas denitration device schematic diagram of a preferred embodiment of the present invention.
Fig. 2 shows the figure that concerns between the import absolute humidity of nitrogen oxides of exhaust gas concentration and combustion air.
Fig. 3 shows the figure that gets in touch between the inlet temperature of nitrogen oxides of exhaust gas concentration and combustion air.
Fig. 4 shows the amount of nitrogen oxide in the engine exhaust gas and the graph of a relation between the load on this internal combustion engine.
Fig. 5 be amino-oxide reduction target value and measure between the distribution map of difference, in the measurement ammonia feed rate according to load and air intlet absolute humidity is controlled and
Fig. 6 is the distribution map of the difference of nitrogen oxide reduction target value and measured value, and the ammonia feed rate is controlled according to single load in the measurement.
By an embodiment the present invention is described more specifically below.But the present invention is not subjected to this
The restriction of embodiment.
The denitration of diesel exhaust is to borrow denitration device shown in Figure 1 to carry out.With reference to Fig. 1, diesel engine 1 is used to drive generator 11.The waste gas of diesel engine 1 with mix from the ammonia that is installed in the ammonia syringe 8 in the flue gas leading 9.The gained mixture enters denitrating tower 2, this waste gas by the catalyst that is placed in one effect and denitration.The waste gas of denitration is discharged in the ambient atmosphere through waste gas comb 10 then.The feed rate of ammonia (by ammonia storage cylinder fitted 3 through flow control valve 7 supply and by 8 injections of ammonia syringe) in ammonia feed rate computing unit 5 by calculating from the signal of sending here through load signal line 6 of diesel engine 1 with from the linear function of the signal of sending here through air intlet absolute humidity holding wire 14 of absolute humidity measurement device 13.The ammonia feed rate can be for example based under the calculating that establishes an equation:
Y=aX
1+ bX
2+ c ... (1) Y wherein: ammonia feed rate
X
1: engine load
X
2: absolute humidity
A, b, c: coefficient
Ammonia feed rate computing unit 5 sends a signal to flow-control valve control 4, the aperture that makes flow control valve 7 have corresponding ammonia feed rate to require.Absolute humidity measurement device 13 has an absolute humidity that is installed in the import of the air that is used to burn with measurement near the moisture detector 12 of the entry zone 15 of diesel engine 1.By this control method, might follow the tracks of the variation of diesel engine load and air intlet absolute humidity satisfactorily, thereby might add the ammonia of optimised quantity.
Fig. 5 and 6 shows the ammonia feed rate control result of the test by the inventive method and conventional method.Fig. 5 is the distribution map of nitrogen oxide reduction target value and measured value error or difference, wherein the ammonia feed rate is controlled according to load and air intlet absolute humidity, Fig. 6 is the distribution of the difference of nitrogen oxide reduction target value and measured value, and wherein the ammonia feed rate is to control according to single load.Can learn that from these figure error of the present invention distributes (as shown in Figure 5) much smaller than conventional method (as shown in Figure 6).Like this, should be clear and definite be to utilize air intlet absolute humidity and load to carry out high accuracy control as the control parameter.
Though used absolute humidity measurement device 13 in this embodiment, the temperature of inlet air measurement device also can replace it.In this case, the ammonia feed rate can be pressed the calculating that establishes an equation:
Y=aX
1+ bX
2+ c ... (2) Y wherein: ammonia feed rate
X
1: engine load
X
2: temperature
A, b, c: coefficient
Also can use absolute humidity measurement device 13 and temperature of inlet air measurement device simultaneously.
In this case, establish an equation under and can be used in the calculating:
Y=aX
1+ bX
2+ cX
3+ d ... (3) Y wherein: ammonia feed rate
X
1: engine load
X
2: absolute humidity
X
3: temperature
A, b, c, d: coefficient
The present invention of above-mentioned described means is arranged, following excellent results is provided:
In equation (3), variable Y, X
1, X
2, X
3Unit and coefficient a.B, c, the d preferred range is as follows:
Y：(Nm
3/h)；X
1：(％)；X
2：(10
-3kg/kg)；X
3：(℃)；a：0≤a≤1；b：-1≤b≤0；c：0≤c≤0.5；d：0≤d≤50。
The present invention of means described above is arranged, following excellent results is provided:
(1) because ammonia always adds with the corresponding amount of nitrogen oxides of exhaust gas amount, therefore can Carry out effective and stable operation, can drop to the danger that ammonia leaks minimum simultaneously.
(2) because the air intlet absolute humidity of utilization burning usefulness and/or temperature and combination are real Engine load in the border is carried out the control of ammonia flow velocity, need not the NOx measurement device, thereby letter Changed device and reduced cost, also saved by the shared space of NOx measurement device. In addition, Basically can not pollute device for performing measurements.
(3) be used for computing unit and change easily with the coefficient of determining the ammonia feed rate, thereby can Control reliably with simple adjustment.
Claims (2)
1. exhaust gas denitration method, wherein the waste gas of internal combustion engine is added into ammonia as NOx reducing agent in the middle part of the extraneous flue gas leading at the described waste gas of row, the described waste gas that is added with ammonia through catalyst that removing nitrogen oxide with its reaction, described method comprises that the relation of utilizing the ammonia feed rate to be directly proportional with the inlet temperature of the air of the described combustion in IC engine of confession controls the feed rate of the ammonia that is added to described waste gas.
2. exhaust gas denitration device, it comprises an apparatus for feeding as the ammonia of NOx reducing agent, this equipment is installed in the middle part of row's engine exhaust gas to outside flue gas leading; With the reactor that has the catalyst of removing nitrogen oxide is arranged, this reactor is installed in the downstream of described apparatus for feeding, and described device comprises the equipment of controlling the ammonia feed rate in described ammonia apparatus for feeding for the equipment of the inlet temperature of the air of combustion in IC engine and the relation that is directly proportional with the inlet temperature of air by the ammonia feed rate according to the signal from described equipment of measuring.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP291863/91 | 1991-10-14 | ||
| JP3291863A JPH05103951A (en) | 1991-10-14 | 1991-10-14 | Exhaust gas-denitrating method and device therefor |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92111501A Division CN1041172C (en) | 1991-10-14 | 1992-10-14 | Exhaust gas denitration method and apparatus therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1206624A CN1206624A (en) | 1999-02-03 |
| CN1090047C true CN1090047C (en) | 2002-09-04 |
Family
ID=17774406
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92111501A Expired - Fee Related CN1041172C (en) | 1991-10-14 | 1992-10-14 | Exhaust gas denitration method and apparatus therefor |
| CN98106678A Expired - Fee Related CN1090047C (en) | 1991-10-14 | 1998-04-20 | Waste gas denitration method and device thereof |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92111501A Expired - Fee Related CN1041172C (en) | 1991-10-14 | 1992-10-14 | Exhaust gas denitration method and apparatus therefor |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH05103951A (en) |
| KR (1) | KR100220447B1 (en) |
| CN (2) | CN1041172C (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100515044B1 (en) * | 2000-12-12 | 2005-09-14 | 주식회사 포스코 | Apparatus for reducing nitrogen oxide in the waste gas of sinter machine |
| JP2003065037A (en) * | 2001-08-30 | 2003-03-05 | Miura Co Ltd | Control method for denitration device |
| JP3718209B2 (en) * | 2003-10-03 | 2005-11-24 | 日産ディーゼル工業株式会社 | Engine exhaust purification system |
| CN100416054C (en) * | 2003-10-22 | 2008-09-03 | 日产柴油机车工业株式会社 | Engine controller and engine operating method |
| JP3687915B2 (en) * | 2003-10-27 | 2005-08-24 | 日産ディーゼル工業株式会社 | Liquid discrimination device |
| JP3687916B2 (en) * | 2003-10-28 | 2005-08-24 | 日産ディーゼル工業株式会社 | Engine exhaust purification system |
| JP3687917B2 (en) * | 2003-10-31 | 2005-08-24 | 日産ディーゼル工業株式会社 | Liquid reducing agent concentration and remaining amount detection device |
| CN100377762C (en) * | 2005-01-13 | 2008-04-02 | 辽宁省燃烧工程技术中心 | Method and special system for removing nitrogen oxide from flume gas of coal-burning power station |
| DE102006047019A1 (en) * | 2006-10-02 | 2008-04-03 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Exhaust gas system's reduction agent containing gas flow providing method for internal combustion engine, involves adding reduction agent containing gas flow to exhaust gas of internal combustion engine |
| DE102007046460A1 (en) * | 2007-09-28 | 2009-04-02 | Daimler Ag | A method for reducing the emission of nitrogen dioxide in a motor vehicle with a lean-burn engine |
| JP4764463B2 (en) * | 2008-09-22 | 2011-09-07 | 株式会社日本自動車部品総合研究所 | Exhaust gas purification control device and exhaust gas purification system for internal combustion engine |
| CN101530740B (en) * | 2009-03-17 | 2012-07-25 | 山东丰元化学股份有限公司 | Process for treating tail gas generated by producing oxalic acid |
| US8459243B2 (en) * | 2009-07-31 | 2013-06-11 | Ford Global Technologies, Llc | Method, systems and sensor for detecting humidity |
| JP5575701B2 (en) * | 2011-05-18 | 2014-08-20 | 住友重機械工業株式会社 | Denitration apparatus and denitration method |
| JP6032985B2 (en) * | 2012-07-18 | 2016-11-30 | 大阪瓦斯株式会社 | Reducing agent injection device and denitration device |
| KR20220133720A (en) * | 2021-03-25 | 2022-10-05 | 에스엠씨케미칼(주) | Ammonia vaporization accelerating device, denitrification device using the same, and incinerator system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3704030A1 (en) * | 1987-02-10 | 1988-08-18 | Ruhrgas Ag | Process for separating off nitrogen oxides from exhaust gases by selective catalytic reduction |
| JPS647930A (en) * | 1987-06-30 | 1989-01-11 | Mitsubishi Heavy Ind Ltd | Method for denitrating exhaust gas from internal-combustion engine |
| JPH03175112A (en) * | 1989-12-05 | 1991-07-30 | Niigata Eng Co Ltd | Denitrating device for exhaust gas of internal combustion engine |
| JP3175112B2 (en) * | 1992-07-29 | 2001-06-11 | 株式会社ニコン | Charged particle beam exposure method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5633025A (en) * | 1979-08-28 | 1981-04-03 | Babcock Hitachi Kk | Control method for injection quantity of ammonia |
-
1991
- 1991-10-14 JP JP3291863A patent/JPH05103951A/en active Pending
-
1992
- 1992-10-14 KR KR1019920018872A patent/KR100220447B1/en not_active IP Right Cessation
- 1992-10-14 CN CN92111501A patent/CN1041172C/en not_active Expired - Fee Related
-
1998
- 1998-04-20 CN CN98106678A patent/CN1090047C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3704030A1 (en) * | 1987-02-10 | 1988-08-18 | Ruhrgas Ag | Process for separating off nitrogen oxides from exhaust gases by selective catalytic reduction |
| JPS647930A (en) * | 1987-06-30 | 1989-01-11 | Mitsubishi Heavy Ind Ltd | Method for denitrating exhaust gas from internal-combustion engine |
| JPH03175112A (en) * | 1989-12-05 | 1991-07-30 | Niigata Eng Co Ltd | Denitrating device for exhaust gas of internal combustion engine |
| JP3175112B2 (en) * | 1992-07-29 | 2001-06-11 | 株式会社ニコン | Charged particle beam exposure method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1071852A (en) | 1993-05-12 |
| KR100220447B1 (en) | 1999-09-15 |
| KR930007494A (en) | 1993-05-20 |
| JPH05103951A (en) | 1993-04-27 |
| CN1206624A (en) | 1999-02-03 |
| CN1041172C (en) | 1998-12-16 |
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