CA2028392C - Method for introducing and metering a liquid treatment medium in combustion processes - Google Patents
Method for introducing and metering a liquid treatment medium in combustion processesInfo
- Publication number
- CA2028392C CA2028392C CA002028392A CA2028392A CA2028392C CA 2028392 C CA2028392 C CA 2028392C CA 002028392 A CA002028392 A CA 002028392A CA 2028392 A CA2028392 A CA 2028392A CA 2028392 C CA2028392 C CA 2028392C
- Authority
- CA
- Canada
- Prior art keywords
- nozzle
- treatment medium
- atomizing
- medium
- mixing chamber
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J7/00—Arrangement of devices for supplying chemicals to fire
-
- 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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Nozzles (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Nozzles For Spraying Of Liquid Fuel (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
An atomizing nozzle and a method of introducing a liquid treatment medium into waste gas flow in combustion processes using the said nozzle. The atomizing nozzle comprises a mixing chamber connected to feed lines for conducting treatment medium and carrier medium to the chamber. A bore leading from the chamber is adapted to permit release of the finely atomized mixture. In operation the liquid treatment medium and a carrier medium are introduced under pressure in desired proportions into the mixing chamber where they are mixed. By virtue of the difference in pressure in the mixing chamber and in the atmosphere surrounding the nozzle, the mixture is expelled from the nozzle in a fine atomized spray.
Description
~ ,JC.,./ ~!
II~OD FOR INT~OD~CIN~ ~ND N~TE~ING A LIQ~D T~ M~N~ ~B~r~ IN
C0XB~8~ P0~8~
The invention is directed to a method for introducing and metering a liquid treatment medium into the waste gas flow in combustion processes. The invention is also directed to an atomizing nozzle, particularly for implementing the method.
In order to inLLo~ce a treatment medium, e.g. chemicals for reducing the NOX content in waste gases, it is known to atomize the chemical by means of a carri~r medium in a two-component nozzle and thus introduce it into the combustion chamber.
Ho~ever, the two-co~ponent nozzle has the disadvan~age that steam or compressed air is supplied as atomizing medium or carrier medium, so that an unwanted dilution of the ~lue gases with air ox steam occurs, which reducas the efficiency of the steam production or, in some cases, of the waste gas cl~nin~ system because a large quantity of this medium is required ~or the atomization. The atomization in a two-component nozzle is effected by means o~ kinetic energy of the atomizing medium, which causes the high throughput of this medium. Moreover, these atomizing media are expensive, since they require increasingly high amounts of energy and, in the event that steam is applied, prepared evaporator feed water. The guidance of these media through lines until the individual nozzles proves costly, since :
either thermally insulated pipe~ must be used in the ca~e of steam or relatively large cross sections must be used for reducing the pressure loss in the system. The expansion of the media at the nozzle outlet and the media flow in the lines generate a relatively high noise level which o~ten even necessitates soundproofing.
A method and an atomizing nozzle for a~ ; n~ an atomized liquid into a gas flow is known from DE-OS 35 41 599, in which the atomized liquid, together with the atomizing gas, is divided in o a plurality of partial flows, wherein every partial flow has a component in the same direction as that of the gas flow in which the atomized liquid is to be introduced. In this method, by means of a two-component nozzle comprising two concentric pipes, the liquid to be atomized is guided in the inner pipe and the atomization gas is guided in the outer pipe, which atomization gas atomizes the liquid at the openin~ of the inner pipe. In so doing, the atomized liquid is first introduced into a dis~ri~utor chamber from which a plurality of pipes proceed diagonally relative to th~ flow direction of the gas flow so that ~h2 waste gas flow to ~e treated can flow around the outlet openings of these distributor pipes on all sides in order to prevent the atomized liquid from being baked on at the outlet end nf the pipes. In a simple two-component nozzle, in which the atomized liquid emerges in the flow direction of the gas flow to be treat2d, the atomized liquid can settle at the outlet opening of the two~co~ponent nozzle because of the turbulence at the latter. In addition to the disadvantages already discussed above with respect to a two-co~ponent nozzle, his known two-component nozzle also has the disadvantage that the metering of the liquid to be atomized presents difficulties, since the pipe of the two-component noz~le ~or conveying the liquid to be atomized ha~ a determined delivery capacity and this quantity can not be throttled too sharply because, otherwise, a uniform atomization of the liquid does not occur.
The present invention has the object of providing a method and an atomizing nozzle for introducing and metering a liquid treatment medium into the waste gas ~low in combustion processe~, by means o~ which a simple and reliable metering of the treatment ~ediu~ to be ato~i~ed i~ en ured wi~h low ~r~n~iture with respect to ~on~L.~ction and energy.
This object is met, according to the invention, in that the liquid treatment medium and a liquid carrier medium are ~ o~uced under pressure in de~ired quantitative proportion to sne another into a ~iY;n~ chamber, mixed in the latter and sprayed fro~ a c -n atomizing opening exclusively on the basis of the pressure difference between the mixing chamber and the external surroundings of the atomizing opening. In this method, in which the two media are introduced under pressure, preferably under equal pressure, and mixed, the quantitative proportion o~
treatment medium to carrier medium can vary as desired in the range of O to 100 %, since the mixing chamber i5 constantly filled with a liquid medium and the necessary atomi~ation pressure can be maintained constantly, speci~ically regaxdless of whether there is any treatment medium or whether there is exclusively only treatment medium. Accordingly, it is possible to regulate the ratio of treatment medium to atomization medium in a uniform or continuous ~n~r. The quantity of tr~atment medium to be atomized can be adjusted by means o~ chan~ing the mixture ratio of treatment medium and carrier mediu~ simply and quickly by ~eans o~ regulating the quantity o~ the traatment medium or carrier medium which are supplied under pressure.
Thus, it is possible e.g. to atomize only pure treatment medium and to turn o~f the carrier medium, and vice versa. If only carrier medi~ is ~prayed from the nozzle, this carrier medium serves to cool the nozzle when the carrier medium i~ e.g. water.
The ~uantities of energy to ba used are very small, since the media can be brought to the nec~s~ry atomization pressure by ~eans of simple pumps. Moreover, no substantial noise arises from the flow of the media in the lines, which need not ~e thermally insulated or soundproofed, so that the structural cost for the entire apparatus is low .
~J~ C,'~
The ato~izing nozzle for the introduction of a liquid treatment medium into the waste gas ~low in combustion processes, which is used in particular for implementing the method, is characterized i~ that the atomizing nozzle is constructed as a one-component nozzle which comprises a pressure feed line for the liquid treatment medium, as well as a pressure feed line for a liquid carrier medium, as well as a ;~ chi h~r to which a single atomiziny opening is directly connected. The atomizatio~
is thus e~fected exclusiYely on the basis of ~he pressure dif~erence between the mixing chamber and the external ~uLLo~n~;n~~ of the nozzle, wherein this pressure difference can be adjusted high enough so that r eL~ flows of the atomized treatment medium and the ~ki n~ on at the nozzle associated with the latter can not occur, so that the spray-in direction can be adjusted a~ desired in the flow diraction of the waste gas flow to be treated. ~oreover, the construction of the a~omizing nozzle, which is co~nected directly to the i~in~ chamber into which the two pressure feed lines open, is extremely simple, since the atomizing noz21e only comprises a single atomizing op~n~ n~ .
In anoth~r construction of the invention, when the mixing chamber has a volume which is sufficient for atomization in a few seco~s, a ~~; Im of 30 seconds, it is ensured that a regulating proces~ requiring quick changes in the mixture ratio or a quick ~, t. ~
turning off of the nozzle can be implemented easily, since only a small quantity with a respective adjusted mixture ratio is present in the mixing chamber.
The invention is explained in more detail in the following with the aid of the drawing which shows an embodiment example of an atomizing nozzle in longitudinal section.
The atomizing nozzle, according to the single drawing, comprises a nozzle body 1 which comprises pressure feed lines 2 and 3 on the one hand and a mixing chamber 4 on the other hand.
~ The pressure feed lines 2 and 3 open into the mixing chAmher 4 and are connected at their other ends with a feed lin2 5 for ths treatment medium on the one hand and with a feed line 6 for the carrier ~edium on the o~her hand. A nozzle head 8, which can be S~L ~wed on the nozzle body 1 and comprises a single atomizing bore hole 9 from which the mixture of ~arrier ~edium and treatment medium emerges and is finely atomized on the basis of the prevailing pres~ure difference inside and outside the atomizing nozzle, is directly c~nn~cted to the mixing ~h; h~r 4 in which the carrier medium and the treatment medium are mixed ~ogether. The mixing chamber 4 has only a low volum2, So that when the mixture ratio of treatment medium and carrier medium is changed, there is only a small after-r-l~ning of already mixed r3 1 h substances, i. e. the change can be made very quickly i~ the mixing chamber 4 has a low volume.
: ~ :
:: :
II~OD FOR INT~OD~CIN~ ~ND N~TE~ING A LIQ~D T~ M~N~ ~B~r~ IN
C0XB~8~ P0~8~
The invention is directed to a method for introducing and metering a liquid treatment medium into the waste gas flow in combustion processes. The invention is also directed to an atomizing nozzle, particularly for implementing the method.
In order to inLLo~ce a treatment medium, e.g. chemicals for reducing the NOX content in waste gases, it is known to atomize the chemical by means of a carri~r medium in a two-component nozzle and thus introduce it into the combustion chamber.
Ho~ever, the two-co~ponent nozzle has the disadvan~age that steam or compressed air is supplied as atomizing medium or carrier medium, so that an unwanted dilution of the ~lue gases with air ox steam occurs, which reducas the efficiency of the steam production or, in some cases, of the waste gas cl~nin~ system because a large quantity of this medium is required ~or the atomization. The atomization in a two-component nozzle is effected by means o~ kinetic energy of the atomizing medium, which causes the high throughput of this medium. Moreover, these atomizing media are expensive, since they require increasingly high amounts of energy and, in the event that steam is applied, prepared evaporator feed water. The guidance of these media through lines until the individual nozzles proves costly, since :
either thermally insulated pipe~ must be used in the ca~e of steam or relatively large cross sections must be used for reducing the pressure loss in the system. The expansion of the media at the nozzle outlet and the media flow in the lines generate a relatively high noise level which o~ten even necessitates soundproofing.
A method and an atomizing nozzle for a~ ; n~ an atomized liquid into a gas flow is known from DE-OS 35 41 599, in which the atomized liquid, together with the atomizing gas, is divided in o a plurality of partial flows, wherein every partial flow has a component in the same direction as that of the gas flow in which the atomized liquid is to be introduced. In this method, by means of a two-component nozzle comprising two concentric pipes, the liquid to be atomized is guided in the inner pipe and the atomization gas is guided in the outer pipe, which atomization gas atomizes the liquid at the openin~ of the inner pipe. In so doing, the atomized liquid is first introduced into a dis~ri~utor chamber from which a plurality of pipes proceed diagonally relative to th~ flow direction of the gas flow so that ~h2 waste gas flow to ~e treated can flow around the outlet openings of these distributor pipes on all sides in order to prevent the atomized liquid from being baked on at the outlet end nf the pipes. In a simple two-component nozzle, in which the atomized liquid emerges in the flow direction of the gas flow to be treat2d, the atomized liquid can settle at the outlet opening of the two~co~ponent nozzle because of the turbulence at the latter. In addition to the disadvantages already discussed above with respect to a two-co~ponent nozzle, his known two-component nozzle also has the disadvantage that the metering of the liquid to be atomized presents difficulties, since the pipe of the two-component noz~le ~or conveying the liquid to be atomized ha~ a determined delivery capacity and this quantity can not be throttled too sharply because, otherwise, a uniform atomization of the liquid does not occur.
The present invention has the object of providing a method and an atomizing nozzle for introducing and metering a liquid treatment medium into the waste gas ~low in combustion processe~, by means o~ which a simple and reliable metering of the treatment ~ediu~ to be ato~i~ed i~ en ured wi~h low ~r~n~iture with respect to ~on~L.~ction and energy.
This object is met, according to the invention, in that the liquid treatment medium and a liquid carrier medium are ~ o~uced under pressure in de~ired quantitative proportion to sne another into a ~iY;n~ chamber, mixed in the latter and sprayed fro~ a c -n atomizing opening exclusively on the basis of the pressure difference between the mixing chamber and the external surroundings of the atomizing opening. In this method, in which the two media are introduced under pressure, preferably under equal pressure, and mixed, the quantitative proportion o~
treatment medium to carrier medium can vary as desired in the range of O to 100 %, since the mixing chamber i5 constantly filled with a liquid medium and the necessary atomi~ation pressure can be maintained constantly, speci~ically regaxdless of whether there is any treatment medium or whether there is exclusively only treatment medium. Accordingly, it is possible to regulate the ratio of treatment medium to atomization medium in a uniform or continuous ~n~r. The quantity of tr~atment medium to be atomized can be adjusted by means o~ chan~ing the mixture ratio of treatment medium and carrier mediu~ simply and quickly by ~eans o~ regulating the quantity o~ the traatment medium or carrier medium which are supplied under pressure.
Thus, it is possible e.g. to atomize only pure treatment medium and to turn o~f the carrier medium, and vice versa. If only carrier medi~ is ~prayed from the nozzle, this carrier medium serves to cool the nozzle when the carrier medium i~ e.g. water.
The ~uantities of energy to ba used are very small, since the media can be brought to the nec~s~ry atomization pressure by ~eans of simple pumps. Moreover, no substantial noise arises from the flow of the media in the lines, which need not ~e thermally insulated or soundproofed, so that the structural cost for the entire apparatus is low .
~J~ C,'~
The ato~izing nozzle for the introduction of a liquid treatment medium into the waste gas ~low in combustion processes, which is used in particular for implementing the method, is characterized i~ that the atomizing nozzle is constructed as a one-component nozzle which comprises a pressure feed line for the liquid treatment medium, as well as a pressure feed line for a liquid carrier medium, as well as a ;~ chi h~r to which a single atomiziny opening is directly connected. The atomizatio~
is thus e~fected exclusiYely on the basis of ~he pressure dif~erence between the mixing chamber and the external ~uLLo~n~;n~~ of the nozzle, wherein this pressure difference can be adjusted high enough so that r eL~ flows of the atomized treatment medium and the ~ki n~ on at the nozzle associated with the latter can not occur, so that the spray-in direction can be adjusted a~ desired in the flow diraction of the waste gas flow to be treated. ~oreover, the construction of the a~omizing nozzle, which is co~nected directly to the i~in~ chamber into which the two pressure feed lines open, is extremely simple, since the atomizing noz21e only comprises a single atomizing op~n~ n~ .
In anoth~r construction of the invention, when the mixing chamber has a volume which is sufficient for atomization in a few seco~s, a ~~; Im of 30 seconds, it is ensured that a regulating proces~ requiring quick changes in the mixture ratio or a quick ~, t. ~
turning off of the nozzle can be implemented easily, since only a small quantity with a respective adjusted mixture ratio is present in the mixing chamber.
The invention is explained in more detail in the following with the aid of the drawing which shows an embodiment example of an atomizing nozzle in longitudinal section.
The atomizing nozzle, according to the single drawing, comprises a nozzle body 1 which comprises pressure feed lines 2 and 3 on the one hand and a mixing chamber 4 on the other hand.
~ The pressure feed lines 2 and 3 open into the mixing chAmher 4 and are connected at their other ends with a feed lin2 5 for ths treatment medium on the one hand and with a feed line 6 for the carrier ~edium on the o~her hand. A nozzle head 8, which can be S~L ~wed on the nozzle body 1 and comprises a single atomizing bore hole 9 from which the mixture of ~arrier ~edium and treatment medium emerges and is finely atomized on the basis of the prevailing pres~ure difference inside and outside the atomizing nozzle, is directly c~nn~cted to the mixing ~h; h~r 4 in which the carrier medium and the treatment medium are mixed ~ogether. The mixing chamber 4 has only a low volum2, So that when the mixture ratio of treatment medium and carrier medium is changed, there is only a small after-r-l~ning of already mixed r3 1 h substances, i. e. the change can be made very quickly i~ the mixing chamber 4 has a low volume.
: ~ :
:: :
Claims (3)
1. Method for introducing and metering a liquid treatment medium into the waste gas flow in combustion processes, characterized in that the liquid treatment medium and a liquid carrier medium are introduced under pressure in a desired quantitative proportion to one another into a mixing chamber, mixed in the latter and sprayed from a common atomizing opening exclusively on the basis of the pressure differences between the mixing chamber and the external surroundings of the atomizing opening.
2. Atomizing nozzle for furnace systems for the introduction of a liquid treatment medium into the waste gas flow in combustion processes, particularly for implementing the method according to claim 1, characterized in that the atomizing nozzle is constructed as a one-component nozzle (1) which comprises a pressure feed line (2) for the liquid treatment medium, as well as a pressure feed line (3) for a liquid carrier medium, as well as a mixing chamber (4), a single atomizing opening (9) being directly connected to the latter.
3. Atomizing nozzle according to claim 2, characterized in that the mixing chamber (4) has a volume which is sufficient for atomizing in a few seconds, a maximum of 30 seconds.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3935401A DE3935401C1 (en) | 1989-10-24 | 1989-10-24 | |
| DEP3935401.6 | 1989-10-24 | ||
| SG44994A SG44994G (en) | 1989-10-24 | 1994-03-26 | Method for introducing and for dosing a liquid treatment medium in combustion processes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2028392A1 CA2028392A1 (en) | 1991-04-25 |
| CA2028392C true CA2028392C (en) | 1999-03-23 |
Family
ID=25886397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002028392A Expired - Lifetime CA2028392C (en) | 1989-10-24 | 1990-10-24 | Method for introducing and metering a liquid treatment medium in combustion processes |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0424895B1 (en) |
| JP (1) | JP2531543B2 (en) |
| AT (1) | ATE88803T1 (en) |
| BR (1) | BR9005346A (en) |
| CA (1) | CA2028392C (en) |
| DE (1) | DE3935401C1 (en) |
| DK (1) | DK0424895T3 (en) |
| ES (1) | ES2041101T3 (en) |
| SG (1) | SG44994G (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007003665B4 (en) * | 2006-08-09 | 2017-08-31 | Martin GmbH für Umwelt- und Energietechnik | Nozzle for introducing and metering a treatment medium into the exhaust gas flow in combustion processes |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1057985B (en) * | 1952-03-07 | 1959-05-21 | Ernst Schlick | Atomizer for liquids to be mixed with one another |
| JPS5216472A (en) * | 1975-07-30 | 1977-02-07 | Babcock Hitachi Kk | Nox reducing agent feeding process and waste gas treatment process |
| SE449449B (en) * | 1984-11-26 | 1987-05-04 | Bejaco Ab | PROCEDURE FOR INHIBITION OF FINE DISTRIBUTED LIQUID IN A GAS FLOW AND DEVICE FOR EXTENDING THE PROCEDURE |
| SE452413B (en) * | 1984-12-04 | 1987-11-30 | Flaekt Ab | MEDIUM MIXING NOZE, INTENDED TO BE USED IN A CONTACT REACTOR |
| DE3935400C1 (en) * | 1989-10-24 | 1990-08-09 | Martin Gmbh Fuer Umwelt- Und Energietechnik, 8000 Muenchen, De |
-
1989
- 1989-10-24 DE DE3935401A patent/DE3935401C1/de not_active Expired - Lifetime
-
1990
- 1990-10-18 JP JP2281708A patent/JP2531543B2/en not_active Expired - Lifetime
- 1990-10-23 EP EP90120347A patent/EP0424895B1/en not_active Expired - Lifetime
- 1990-10-23 BR BR909005346A patent/BR9005346A/en not_active IP Right Cessation
- 1990-10-23 DK DK90120347.1T patent/DK0424895T3/en active
- 1990-10-23 ES ES199090120347T patent/ES2041101T3/en not_active Expired - Lifetime
- 1990-10-23 AT AT90120347T patent/ATE88803T1/en not_active IP Right Cessation
- 1990-10-24 CA CA002028392A patent/CA2028392C/en not_active Expired - Lifetime
-
1994
- 1994-03-26 SG SG44994A patent/SG44994G/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ES2041101T3 (en) | 1993-11-01 |
| CA2028392A1 (en) | 1991-04-25 |
| SG44994G (en) | 1994-11-25 |
| DK0424895T3 (en) | 1993-08-16 |
| ATE88803T1 (en) | 1993-05-15 |
| JPH03255811A (en) | 1991-11-14 |
| EP0424895B1 (en) | 1993-04-28 |
| DE3935401C1 (en) | 1991-06-20 |
| JP2531543B2 (en) | 1996-09-04 |
| EP0424895A3 (en) | 1991-08-21 |
| BR9005346A (en) | 1991-09-17 |
| EP0424895A2 (en) | 1991-05-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |