CA2028384C - Method for introducing a treatment medium into the waste gas flow in combustion processes - Google Patents
Method for introducing a treatment medium into the waste gas flow in combustion processesInfo
- Publication number
- CA2028384C CA2028384C CA002028384A CA2028384A CA2028384C CA 2028384 C CA2028384 C CA 2028384C CA 002028384 A CA002028384 A CA 002028384A CA 2028384 A CA2028384 A CA 2028384A CA 2028384 C CA2028384 C CA 2028384C
- Authority
- CA
- Canada
- Prior art keywords
- treatment medium
- flame
- medium
- nozzles
- nozzle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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
- B01D53/346—Controlling the process
-
- 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
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treating Waste Gases (AREA)
- Incineration Of Waste (AREA)
- Radiation Pyrometers (AREA)
- Chimneys And Flues (AREA)
Abstract
The method for introducing a treatment medium into the waste gas flow in combustion processes provides that a carrier medium is mixed with a treatment medium, wherein these media are brought to a pressure level necessary for atomization in a one-component nozzle prior to mixing. The quantitative proportion of treatment medium to carrier medium, which is adjustable as desired, is adjusted as a function of the NOx gas concentration in the treated gas flow or as a function of the gas quantity. It is substantial in this method that a plurality of atomizing nozzles are arranged in different planes, and that the flame development in the furnace is monitored by means of flame detectors. When the flame front reaches the lowest nozzle plane, the supply of treatment medium to these nozzles is blocked and the nozzles located above the latter, in which there is not yet a flame, are regulated with respect to the throughput of treatment medium as a function of the NOx gas concentration or the waste gas quantity.
As soon as the flame front forms again in the area of the lowest nozzles, treatment medium is again admitted to these atomizing nozzles. Carrier medium can also be admitted to the lower atomizing nozzles without treatment medium in order to cool the nozzles when the carrier medium is water.
As soon as the flame front forms again in the area of the lowest nozzles, treatment medium is again admitted to these atomizing nozzles. Carrier medium can also be admitted to the lower atomizing nozzles without treatment medium in order to cool the nozzles when the carrier medium is water.
Description
2 ~
~S~5~ FOR INTRO~CIN~ A ~P~NT ~DI~ INTO T~ T~ ~AB ~0 IN ~ O~ ~kO~ ~R
The invention is directed to a method for in~ ucing a treatment medium in the form of chemicals into the waste ga~ ~low in combu~tion proc~s~es by means of a carrier ~edium through an atomizing nozzle for reducing the nitric oxide co~c~ntration, wherein i~,~LGd~ction into the furnace is effected in at least two planes lying one above the other, in which atomizing nozzles are arranged, the treatment medium being admitted to the latter alternately or jointly, as desired.
The il.~Lo~ e~ chemical~ for reducing the nitric oxide content in the waste gases are generally ~ -n; ~ ~ ~al ammoniac, urea or calci~m cyanamide, which can be mixed under certain circumst~n~e~C with different hydrocarbon compound~ as so-called reinforcing chemic~ls. The reactions taking place be~ween these chemical~ and nitric o~ s in the flue gas flow are reduction reactions in which the nitrogen monoxide present in the flue gas is re~llce~ to pure nitrogen. These reactions require relatively high ambient temperatures in order for the reaction to run optimally and quickly. How~ver, these temperatures are between 750~C and 1,100~C, dep~ on the chemicals or on the chemical ~ixture. It is generally true for these chemicals, within 83~
certain limit~, that higher temperature~ al~o ensure more effective reaction conditions. For thi~ reason, in the known method, the treatment media are introduced in a plurality of planes by means of akomizing nozzles, wherein treatment medium is admitted to the individual planes correspondinq to the respective favorable temperature conditions. Thermoelements which determine the temperature distribution and automatically effect a switching between the individual nozzle planes are used for this purpose.
In spite of thi6 expenditure, the process does not always proceed in a satisfactory manner. Increase~ in the ovexall level of nitric oxides in the flue ga~ have even been deter i ne~, which can be traced back to ~ destruction by means of combustion of the in~.o~cPd che~icals when the latter contain nitrogen.
~ he object of the present invention i to provide a method in which a reliable reduction of the nitric oxide concentration in the flue gas is ensured.
This object is met, according to the invention, proçee~in~
from the method ~entioned in the beg; nn; ng, in that the switching from one nozzle plane to the next nozzle plane is e~fected as a function of the presPnGe of a flame in the area of the respective noz~le plane.
. , .
This suggestion for a solution i~ based on the realization that the introduced chemicals are always destroyed when they come into contact with a flame. The present invention accordingly no longer bases the regulating process on a deteL ;ne~ temperature profile, as was previously the case, but rather solely on the presence or absence of a ~lame.
In a preferred emb~diment of the method, according to the invention, all nozzle planes are acted upon in the absence o~ a flame and when a flame is present in one or more of the nozzle planes, this nozzle plane is completely cut off from ~he supply of treatment media and the ~- a;n;n~ nozzle planes are acted upon corres~on~inq to the determined required treatment medium. In c~nn~ction with a sensitive monitoring o~ the flame in the ~_ hv-~tion chamber by m~ans of flame detectors, particularly optical ~ ers, thermographic cameras, video ca~er~s, photocells, etc., the guantity o~ treatment medium n~ces~Ary for adjusting a desired nitric oxide content in the ~lue gas can be in~Lo~ced reg~rdless of the height of the respective flame front within the co~bustion chArh~r. The aforementioned ~lame detectors work very quickly, so that a switching from one nozzle plane to the next nozzle plane can be e~ected very quickly and destruction caused by chemical splitting of the introduced chemicals is prevented.
2~2~3~
The invention is described in more detail in the following by means of the drawings.
Fig. 1 shows a s~h~- ~tic view of the apparatus for introducing the trea~ment medium; and Fig. 2 shows a cchematic view of the process flow chart in connection with the regulating system.
The schematic flow chart for the carrier medium and the treatment medium can be seen from Fig. 1. According to the latter, a reservoir container for the che~ical which is to be intro~ce~ into the furnace and is found in this container, e.g.
in powder for~ designated by 1. The chemical arrives in a container 3 via a lock 2, water for dissolving the chemical being intro~o~e~ int~ the container 3 via a valve 4. The prepared solution or suspen~ion is kept in constant circulating movement by ~eans of an agitat3r 5 in order to prevent separation. A
level ~onitoring system which ensures the supply of chemicals from the reservoir 1 when falling ~elow the minimum level is designated by 6. A floater 7 monitors the liquid status in the container 3 and influences the valve 4 for the supply of water into the container 3. The treatment medium is supplied to a plurality of atomizing no~zles 10 via a line 8 by means of a pump 9, which atomizing nozzles 10 are arranged in the wall 11 of a furnace 12 so as to be distributed in a plurality of planes. A
2~2~3~
check valve 14 is provided in the pressure line 13 leading ~rom the pump 9 to the atomizing nozzles 10 in ~rder to prevent the return flow of carrier medium into the container 3. The carrier medium, which is water in the present example, is guided by means of pumps 15 via valves 16 to a pressure line 17 which leads to the atomizing nozzles 10. A check valve 18 and a pressuxe ~ ring point 19 are provided inside the pressure line.
Another pressure measuring point 20 monitors the pressure in the atomizing nozzles 10. A flame detector 21 is provided in the vicinity of the atomizing nozzles 10 of the lower row o~ nozzle~
and blocks a valve 22 in the pressure feed line 13 for the treatment medium via a regulating system, not shown in this drawing, when a flame is pressnt in the area of the lower atomizing nozzle 10. If this i~ not desired, the carrier medium can also be blocked or throttled by means of a valve 23 when t~e operating conditions in the furnace allow. A certain supply of carrier medium can certainly ba desired in order to cool the atomizing nozzle cven if the treatment medium is blocked.
The regulating system, which helps to regulate the introduction of the treatment medium generally and, over and above this, as a function of the flame development in the furnace, is now expl~in~ by means of Fig. 2. The same reference numbers are used insofar as parts which were already described in Fig. 1 are concerned. Treatment medium and carrier medium are supplied to the atomi~ing nozzles 10, which open into the furnace ~2g3~
12, by means of pumps 9 and 15. The boiler, to which feed water is supplied via a line 25, is designated in its entirety by 24.
The steam tapping line is designated by 26, whereas the flue gas exhaust is sy~bolized by reference number 27.
The delivery quantity of treatment medium, i.e. the chemical which is provided for introduction into the furnace 12, i5 adjusted by meanC of a regulating system 2B. The regulating i8 effected as a ~unction of the NOx concentration in the flue gas of the flue gas eXhaust 27, wherein the measurement of this gas concentration is effected at a location in which flue gas whi~h has already been treated, i.e. flue gas mixed with the.treatment medium, is located. This signal is supplied to the regulating system 28 via ~he line 29. The value which, when exceede~, causes treatment medium to be supplied to the furnace for ~reating ~he flue gas is adjusted by means of a reference value tran~mitter 30 ~or the reference value of the N~x content. The supply of treatment medium is thus regulated a~ a function of the difference between the a~tual NOX content supplied via the l me 29 and the v~lue predeter~ined by the reference value transmittsr 30. Further, the regulating system 28 can regulate the supplied quantity of treatment ~edium or additionally as a function of the flue gas volume flow, wherein this value is measured in the flue gas exhaust 27 and the correspon~;ng signal is supplied to the regulating system 28 by means of the line 31.
~2~3,~
This measurement value, which concerns the vol~me ~low of the f lue gas, is also directed via a line 31 to another regulating system 32 which is provided for adju~ting the atomization pressure. A reference value transmitter 33 for the atomization pressure predetermines a fixed value adapted to the nozzle configuration, or the atomization pressure can be adjusted as a function of the flue gas volume flow or the evaporator load.
The meas~c ~t value concerning the flue gas volume flow is supplied via line 31, while the mea~ nt value c-onc~rning the evaporator load is supplied via line 34. A ~ignal line which supplies the actual pre~;1i ng atomization pressure to the regulating system 32 is designated by 35.
A flame detector 21 is provided below the lower atomizing nozzle 10 closer to ~he furnace and directs a signal, via a line 36, to a regulating system 37 when a flame occurs in this area, which regulating ~ystem 37 transmits a corre~pon~;~g oontrol command, via a ~on~ol line 38, to the valve 22 which monitors the feed of treatment medium to the atomizing nozzle of the lower nozzle plane.
When no flame i5 determined by the detector 21, both the carrier medium and the treatment medium are supplied to the atomizing nozzles in all planes by means of the pumps 15 and 9, respectively, wherein the quantity of the supplied treatment medium is adjusted by means of the regulating systPm 28 as a ...,. ~ . .
.. ... .
2~2~3~
function of the N~x content or ,as a function of ~he waste ga~
volume flow. As soon as the detector 21 dete~ ;~es a flame in the area of the lower no~zle plane, the valve 22 is closed in order to pLeVe~l~ a decomposition of the introduced chemical, and treatment medi~m i~ admitted only to the upper row o~ atomizin~
nozzles lOr wherein the upper row of nozzles is supplied with more treatment medium after the exclusion of the lower row to the extent that nothing has changed with respect to the ~lue gas co~cPntration up ~o that point. For the rest, treatment mediu~
i8 admitted to these no~zles of the upper row via the regulating syste~ 28 corre~pQn~; n~ to the required treat~ent medium.
. , . . .
;~ . .
~S~5~ FOR INTRO~CIN~ A ~P~NT ~DI~ INTO T~ T~ ~AB ~0 IN ~ O~ ~kO~ ~R
The invention is directed to a method for in~ ucing a treatment medium in the form of chemicals into the waste ga~ ~low in combu~tion proc~s~es by means of a carrier ~edium through an atomizing nozzle for reducing the nitric oxide co~c~ntration, wherein i~,~LGd~ction into the furnace is effected in at least two planes lying one above the other, in which atomizing nozzles are arranged, the treatment medium being admitted to the latter alternately or jointly, as desired.
The il.~Lo~ e~ chemical~ for reducing the nitric oxide content in the waste gases are generally ~ -n; ~ ~ ~al ammoniac, urea or calci~m cyanamide, which can be mixed under certain circumst~n~e~C with different hydrocarbon compound~ as so-called reinforcing chemic~ls. The reactions taking place be~ween these chemical~ and nitric o~ s in the flue gas flow are reduction reactions in which the nitrogen monoxide present in the flue gas is re~llce~ to pure nitrogen. These reactions require relatively high ambient temperatures in order for the reaction to run optimally and quickly. How~ver, these temperatures are between 750~C and 1,100~C, dep~ on the chemicals or on the chemical ~ixture. It is generally true for these chemicals, within 83~
certain limit~, that higher temperature~ al~o ensure more effective reaction conditions. For thi~ reason, in the known method, the treatment media are introduced in a plurality of planes by means of akomizing nozzles, wherein treatment medium is admitted to the individual planes correspondinq to the respective favorable temperature conditions. Thermoelements which determine the temperature distribution and automatically effect a switching between the individual nozzle planes are used for this purpose.
In spite of thi6 expenditure, the process does not always proceed in a satisfactory manner. Increase~ in the ovexall level of nitric oxides in the flue ga~ have even been deter i ne~, which can be traced back to ~ destruction by means of combustion of the in~.o~cPd che~icals when the latter contain nitrogen.
~ he object of the present invention i to provide a method in which a reliable reduction of the nitric oxide concentration in the flue gas is ensured.
This object is met, according to the invention, proçee~in~
from the method ~entioned in the beg; nn; ng, in that the switching from one nozzle plane to the next nozzle plane is e~fected as a function of the presPnGe of a flame in the area of the respective noz~le plane.
. , .
This suggestion for a solution i~ based on the realization that the introduced chemicals are always destroyed when they come into contact with a flame. The present invention accordingly no longer bases the regulating process on a deteL ;ne~ temperature profile, as was previously the case, but rather solely on the presence or absence of a ~lame.
In a preferred emb~diment of the method, according to the invention, all nozzle planes are acted upon in the absence o~ a flame and when a flame is present in one or more of the nozzle planes, this nozzle plane is completely cut off from ~he supply of treatment media and the ~- a;n;n~ nozzle planes are acted upon corres~on~inq to the determined required treatment medium. In c~nn~ction with a sensitive monitoring o~ the flame in the ~_ hv-~tion chamber by m~ans of flame detectors, particularly optical ~ ers, thermographic cameras, video ca~er~s, photocells, etc., the guantity o~ treatment medium n~ces~Ary for adjusting a desired nitric oxide content in the ~lue gas can be in~Lo~ced reg~rdless of the height of the respective flame front within the co~bustion chArh~r. The aforementioned ~lame detectors work very quickly, so that a switching from one nozzle plane to the next nozzle plane can be e~ected very quickly and destruction caused by chemical splitting of the introduced chemicals is prevented.
2~2~3~
The invention is described in more detail in the following by means of the drawings.
Fig. 1 shows a s~h~- ~tic view of the apparatus for introducing the trea~ment medium; and Fig. 2 shows a cchematic view of the process flow chart in connection with the regulating system.
The schematic flow chart for the carrier medium and the treatment medium can be seen from Fig. 1. According to the latter, a reservoir container for the che~ical which is to be intro~ce~ into the furnace and is found in this container, e.g.
in powder for~ designated by 1. The chemical arrives in a container 3 via a lock 2, water for dissolving the chemical being intro~o~e~ int~ the container 3 via a valve 4. The prepared solution or suspen~ion is kept in constant circulating movement by ~eans of an agitat3r 5 in order to prevent separation. A
level ~onitoring system which ensures the supply of chemicals from the reservoir 1 when falling ~elow the minimum level is designated by 6. A floater 7 monitors the liquid status in the container 3 and influences the valve 4 for the supply of water into the container 3. The treatment medium is supplied to a plurality of atomizing no~zles 10 via a line 8 by means of a pump 9, which atomizing nozzles 10 are arranged in the wall 11 of a furnace 12 so as to be distributed in a plurality of planes. A
2~2~3~
check valve 14 is provided in the pressure line 13 leading ~rom the pump 9 to the atomizing nozzles 10 in ~rder to prevent the return flow of carrier medium into the container 3. The carrier medium, which is water in the present example, is guided by means of pumps 15 via valves 16 to a pressure line 17 which leads to the atomizing nozzles 10. A check valve 18 and a pressuxe ~ ring point 19 are provided inside the pressure line.
Another pressure measuring point 20 monitors the pressure in the atomizing nozzles 10. A flame detector 21 is provided in the vicinity of the atomizing nozzles 10 of the lower row o~ nozzle~
and blocks a valve 22 in the pressure feed line 13 for the treatment medium via a regulating system, not shown in this drawing, when a flame is pressnt in the area of the lower atomizing nozzle 10. If this i~ not desired, the carrier medium can also be blocked or throttled by means of a valve 23 when t~e operating conditions in the furnace allow. A certain supply of carrier medium can certainly ba desired in order to cool the atomizing nozzle cven if the treatment medium is blocked.
The regulating system, which helps to regulate the introduction of the treatment medium generally and, over and above this, as a function of the flame development in the furnace, is now expl~in~ by means of Fig. 2. The same reference numbers are used insofar as parts which were already described in Fig. 1 are concerned. Treatment medium and carrier medium are supplied to the atomi~ing nozzles 10, which open into the furnace ~2g3~
12, by means of pumps 9 and 15. The boiler, to which feed water is supplied via a line 25, is designated in its entirety by 24.
The steam tapping line is designated by 26, whereas the flue gas exhaust is sy~bolized by reference number 27.
The delivery quantity of treatment medium, i.e. the chemical which is provided for introduction into the furnace 12, i5 adjusted by meanC of a regulating system 2B. The regulating i8 effected as a ~unction of the NOx concentration in the flue gas of the flue gas eXhaust 27, wherein the measurement of this gas concentration is effected at a location in which flue gas whi~h has already been treated, i.e. flue gas mixed with the.treatment medium, is located. This signal is supplied to the regulating system 28 via ~he line 29. The value which, when exceede~, causes treatment medium to be supplied to the furnace for ~reating ~he flue gas is adjusted by means of a reference value tran~mitter 30 ~or the reference value of the N~x content. The supply of treatment medium is thus regulated a~ a function of the difference between the a~tual NOX content supplied via the l me 29 and the v~lue predeter~ined by the reference value transmittsr 30. Further, the regulating system 28 can regulate the supplied quantity of treatment ~edium or additionally as a function of the flue gas volume flow, wherein this value is measured in the flue gas exhaust 27 and the correspon~;ng signal is supplied to the regulating system 28 by means of the line 31.
~2~3,~
This measurement value, which concerns the vol~me ~low of the f lue gas, is also directed via a line 31 to another regulating system 32 which is provided for adju~ting the atomization pressure. A reference value transmitter 33 for the atomization pressure predetermines a fixed value adapted to the nozzle configuration, or the atomization pressure can be adjusted as a function of the flue gas volume flow or the evaporator load.
The meas~c ~t value concerning the flue gas volume flow is supplied via line 31, while the mea~ nt value c-onc~rning the evaporator load is supplied via line 34. A ~ignal line which supplies the actual pre~;1i ng atomization pressure to the regulating system 32 is designated by 35.
A flame detector 21 is provided below the lower atomizing nozzle 10 closer to ~he furnace and directs a signal, via a line 36, to a regulating system 37 when a flame occurs in this area, which regulating ~ystem 37 transmits a corre~pon~;~g oontrol command, via a ~on~ol line 38, to the valve 22 which monitors the feed of treatment medium to the atomizing nozzle of the lower nozzle plane.
When no flame i5 determined by the detector 21, both the carrier medium and the treatment medium are supplied to the atomizing nozzles in all planes by means of the pumps 15 and 9, respectively, wherein the quantity of the supplied treatment medium is adjusted by means of the regulating systPm 28 as a ...,. ~ . .
.. ... .
2~2~3~
function of the N~x content or ,as a function of ~he waste ga~
volume flow. As soon as the detector 21 dete~ ;~es a flame in the area of the lower no~zle plane, the valve 22 is closed in order to pLeVe~l~ a decomposition of the introduced chemical, and treatment medi~m i~ admitted only to the upper row o~ atomizin~
nozzles lOr wherein the upper row of nozzles is supplied with more treatment medium after the exclusion of the lower row to the extent that nothing has changed with respect to the ~lue gas co~cPntration up ~o that point. For the rest, treatment mediu~
i8 admitted to these no~zles of the upper row via the regulating syste~ 28 corre~pQn~; n~ to the required treat~ent medium.
. , . . .
;~ . .
Claims (3)
1. Method for the introduction of a treatment medium in the form of chemicals into the waste gas flow in combustion processes by means of a carrier medium through an atomizing nozzle for reducing the nitric oxide concentrations, wherein the introduction into the furnace is effected in at least two plane lying one on top of the other, in which atomizing nozzles are arranged, treatment medium being admitted to the latter alternately or jointly, as desired, characterized in that the switching from one nozzle plane to the next nozzle plane is effected as a function of the presence of a flame in the area of the respective nozzle plane.
2. Method according to claim 1, characterized in that all nozzle planes are acted upon in the absence of a flame, and in that, in the presence of a flame in one or more nozzle planes, the respective nozzle plane is completely cut off from the supply of treatment medium and the remaining nozzle planes are acted upon corresponding to the determined requirement of treatment medium.
3. Method according to claim 1 or 2, characterized in that flame detectors, particularly optical pyrometers, thermographic cameras, video cameras, photocells, etc., are used for monitoring the flame.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3935400.8 | 1989-10-24 | ||
| DE3935400A DE3935400C1 (en) | 1989-10-24 | 1989-10-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2028384A1 CA2028384A1 (en) | 1991-04-25 |
| CA2028384C true CA2028384C (en) | 1998-05-12 |
Family
ID=6392099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002028384A Expired - Lifetime CA2028384C (en) | 1989-10-24 | 1990-10-24 | Method for introducing a treatment medium into the waste gas flow in combustion processes |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0424893B1 (en) |
| JP (1) | JPH03207429A (en) |
| AT (1) | ATE108688T1 (en) |
| BR (1) | BR9005345A (en) |
| CA (1) | CA2028384C (en) |
| DE (1) | DE3935400C1 (en) |
| DK (1) | DK0424893T3 (en) |
| ES (1) | ES2060891T3 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3935401C1 (en) * | 1989-10-24 | 1991-06-20 | Martin Gmbh Fuer Umwelt- Und Energietechnik, 8000 Muenchen, De | |
| EP0523469A1 (en) * | 1991-07-18 | 1993-01-20 | Siemens Aktiengesellschaft | Method for the reduction of NOx emission of a gas turbine |
| DE4130348A1 (en) * | 1991-09-12 | 1993-03-18 | Evt Energie & Verfahrenstech | Reductant injection into flue gas stream - using regulated lances arranged in several planes |
| DE102008036099B4 (en) | 2008-08-04 | 2014-02-13 | Steag Power Saar Gmbh | denitrification |
| DE102017001025B4 (en) | 2017-02-03 | 2020-10-08 | Rs Rittel Gmbh | Incinerator and waste gas treatment process |
| EP3829750A1 (en) | 2018-08-03 | 2021-06-09 | RS Rittel GmbH | Spray lance, combustion plant and method for treating waste gas |
| CN111773917A (en) * | 2020-07-17 | 2020-10-16 | 广东中微环保生物科技有限公司 | Nutrient solution automatic compensation system for waste gas biological treatment device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1097487A (en) * | 1976-04-20 | 1981-03-17 | David W. Turner | Method and apparatus for reducing no.sub.x emission to the atmosphere |
| JPS6014926A (en) * | 1983-07-07 | 1985-01-25 | Hitachi Zosen Corp | Apparatus for decreasing nh3 leakage in denitration by injecting nh3 |
| DE3722523C1 (en) * | 1987-07-08 | 1988-06-30 | Babcock Anlagen Ag | Furnace with nozzles for blowing in ammonia for selective noncatalytic flue gas denitration (SNCR) |
-
1989
- 1989-10-24 DE DE3935400A patent/DE3935400C1/de not_active Expired - Lifetime
-
1990
- 1990-10-17 JP JP2278860A patent/JPH03207429A/en active Pending
- 1990-10-23 EP EP90120345A patent/EP0424893B1/en not_active Expired - Lifetime
- 1990-10-23 DK DK90120345.5T patent/DK0424893T3/en active
- 1990-10-23 ES ES90120345T patent/ES2060891T3/en not_active Expired - Lifetime
- 1990-10-23 AT AT90120345T patent/ATE108688T1/en not_active IP Right Cessation
- 1990-10-23 BR BR909005345A patent/BR9005345A/en not_active IP Right Cessation
- 1990-10-24 CA CA002028384A patent/CA2028384C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| BR9005345A (en) | 1991-09-17 |
| EP0424893B1 (en) | 1994-07-20 |
| ES2060891T3 (en) | 1994-12-01 |
| DE3935400C1 (en) | 1990-08-09 |
| EP0424893A1 (en) | 1991-05-02 |
| CA2028384A1 (en) | 1991-04-25 |
| DK0424893T3 (en) | 1994-11-14 |
| JPH03207429A (en) | 1991-09-10 |
| ATE108688T1 (en) | 1994-08-15 |
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