CA1319097C - Process and equipment for cleaning industrial fumes - Google Patents
Process and equipment for cleaning industrial fumesInfo
- Publication number
- CA1319097C CA1319097C CA000568940A CA568940A CA1319097C CA 1319097 C CA1319097 C CA 1319097C CA 000568940 A CA000568940 A CA 000568940A CA 568940 A CA568940 A CA 568940A CA 1319097 C CA1319097 C CA 1319097C
- Authority
- CA
- Canada
- Prior art keywords
- fumes
- scrubber
- cyclonic
- water
- gases
- 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 - Fee Related
Links
- 239000003517 fume Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004140 cleaning Methods 0.000 title claims abstract description 17
- 238000005406 washing Methods 0.000 claims abstract description 31
- 239000007789 gas Substances 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 241001651387 Cladara atroliturata Species 0.000 claims 1
- 239000008213 purified water Substances 0.000 claims 1
- 239000007921 spray Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 10
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 6
- 239000000428 dust Substances 0.000 description 5
- 206010022000 influenza Diseases 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 235000010269 sulphur dioxide Nutrition 0.000 description 2
- 239000004291 sulphur dioxide Substances 0.000 description 2
- 244000007645 Citrus mitis Species 0.000 description 1
- 229910017082 Fe-Si Inorganic materials 0.000 description 1
- 229910017133 Fe—Si Inorganic materials 0.000 description 1
- 229910004014 SiF4 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010742 number 1 fuel oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/12—Washers with plural different washing sections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/10—Venturi scrubbers
-
- 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
-
- 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
-
- 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
-
- 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
- B01D53/68—Halogens or halogen compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
- Separation Of Particles Using Liquids (AREA)
Abstract
"PROCESS AND EQUIPMENT FOR CLEANING INDUSTRIAL FUMES"
A b s t r a c t In a process and equipment for cleaning industrial fumes of the type wherein the fumes are submitted to a first washing stage in a cyclonic-scrubber operating as a saturator, wherein the fumes, flowing along a spiral path, are sprayed by a washing liquid, and to a second stage, wherein the fumes, leaving the saturator, flow through a Venturi-scrubber, the cleaning efficiency is considerably improved, both with regard to dusts collection and chiefly to the capture of polluting gases (such as SOx, NOx, C12, F , and so forth), by providing, downstream the Venturi-scrubber, a further washing stage in a second cyclonic-scrubber.
A b s t r a c t In a process and equipment for cleaning industrial fumes of the type wherein the fumes are submitted to a first washing stage in a cyclonic-scrubber operating as a saturator, wherein the fumes, flowing along a spiral path, are sprayed by a washing liquid, and to a second stage, wherein the fumes, leaving the saturator, flow through a Venturi-scrubber, the cleaning efficiency is considerably improved, both with regard to dusts collection and chiefly to the capture of polluting gases (such as SOx, NOx, C12, F , and so forth), by providing, downstream the Venturi-scrubber, a further washing stage in a second cyclonic-scrubber.
Description
~19097 , "PROCESS AND EQUIPMENT FOR CLEANING INDUSTRIAL FUMES"
This invention concerns industrial fumes cleaning and more specifically the capture of polluting dusts and gases (such as SOx, NOx, C12, F , and so forth).
Ai,long known processes and equipments for the same purpose, ~hose disclosed by Italian Patent N. 9~1,166 and 1.045.466 to the same Applicant's name, can be mentioned.
In such patents process and equipment for cleaning fumes at least partially combustible and carrying dusts (essentially metal oxydes) and chiefly the fumes developed by steelmaking are described.
The said processes consist of a post-combustion stage of combustible gases and a dust collection stage by washing (with water or other liquids) in two steps: first step of pre-washing in a saturator and second step of end washing in a Venturi scrubber.
In the frame of the processes and equipments subject matter of the above mentioned Patents, a washing tower is described, divided in two separate parts by a baffle, having the following features:
- a tangential fitting for the inlet of the fumes to be cleaned in the upper portion of the washing tower, which operates as a saturator;
- a header with nozzles spraying water in cross-current to the fumes rising according to spiral flow pattern, as in a cyclone washer;
- a Venturi scrubber outside the tower and connected to this latter by two elbow ducts: the upper one between the saturator outlet and the convergent portion of the Venturi pipe, the lower between the divergent portion of the Venturi pipe and the tangential inlet into the lower part of the washing tower;
~k ' - a tangential inlet for the cleaned fumes in the lower portion of the tower in order to collect the finest droplets.
Inasmuch as the industrial fumes, especially the flue gases from combustion of coal and/or fuel oil, e.g. in the production of steam and/or electrical power, contain dusts, prevailingly metal oxides, and acid gases, the industrial and social importance of any improvement of the cleaning degree become evident.
In accordance with the invention, it has been discovered that if a third cyclone-type washing stage is added to the process and equipment as disclosed in the above said Italian Patents downstream the Venturi scrubber, further improvements of the cleaning degree are achieved with minimum additional operating costs and no increase of washing water cansumption.
ThereEore, the present invention provides a process for industrial fumes or gases cleaning, in which the fumes and gases are submitted to a first washing with water in a cyclonic-scrubber operating as a saturator, and then to a second washing with water in a Venturi scrubber, wherein:
(a) the fumes or gases exiting the Venturi scrubber are washed with water in a second cyclonic-scrubber;
(b) the exhaust water exiting the first cyclonic scrubher is purified and sent to a settling tank;
(c) the second cyclonic-scrubber is fed with the puri~ied water exiting said settling tank;
(d) the water exiting the V~nturi scrubbar is fed to the first cyclonic scrubber, and (e) the exhaust water exiting the third cyclonic scrubber is fed to the Venturi scrubber.
The invention also provides an equipment for industrial fumes or gases cleaning, comprising:
~3~9097 (a) a first cyclonic scrubber in which the fumes or gases are washed with wash water;
(b) a Venturi scrubber downstream of (a), in which the fumes or gases are also washed with wash water;
and (c) a second cyclonic scrubber downstream of (b), in which the fumes or gases are further washed with wash water;
wherein said first and said second cyclonic scrubbers are two discrete axially superposed sections composing a single cyclonic washing tower, each individual section having a sloped bottom wall for collecting and draining the wash water.
The typical features and advantages of this invention are cleared up by the following detailed description, reEerring to the accompanying drawing, which shows diagrammatically and exemplary embodiment of the equipment according to the invention.
Having now reference to the drawing, a washing tower 1 is shown, partitioned by a sloping baffle 2 in an upper washing section lA and a lower washing section lB.
The baffle 2 is sloping in æuch a way as to convey water falling on it to a drain 3. The reference numeral 4 indicates the inlet of the fumes to be cleaned and the reference numeral 5 indicates the outlet from the section lA
for the fumes processed inside the same section.
The washing of the fumes is made by a æpraying pipe 6 which delivers radial jets of water, fed through the pipe 8 by the pump 7.
From the outlet 5 the fumes go through an elbow 5A
into the Venturi scrubber 9 consisting of an upstream, or convergent, i319~97 section 9B~ a narrow section 9A to which wash water is fed through the pipe 10 by the pump 11 and a downstream, or divergent, section 9C.
From the elbow 13A of the Yenturi scrubber the water separated due to centrifugal effect is collected and discharged into a tan~ 12 from which it is drawn by the pump 7.
The fumes or gases from the outlet 13 of the Venturi scrubber 9 enter the lower section 18 of the washing tower 1 where a washing process, almost in the same way as in the upper section lA, is carried out by the spraying pipe 14 fed with pressure water through the pipe 15 by the pump 16.
The water collected on the sloping bottom 17 o~ the section lB feeds the pump 11 and the cleaned fumes intaken by the fan 18 through the duct 20 are exhausted to the atmosphere through the stack 19.
The wash water discharged from the first cyclone washing device (section lA) goes to a tank 21, wherein it is preferably neutralized with an alkaline reagent, e.g. lime, and is sent to a settliny and washing tank 22 whose water feeds the pump 16 through the reservoir 23, whilst the sludges are removed and disposed of in the usual way.
Finally through the tube 24 it is possible to restore the washing water.
From the above stated description two important features of this invention appear clearly:
a) an improvement of the cleaning degree of the fumes, which approach 99-99,5X referred to the dusts and 92-98X referred to the polluting gases and vapours, whilst by the prior art a cleaning degree of g8-99% for the dusts and 60-92% for the gases and vapours was achieved;
- l3~as7 h) a subs~antial saving of water9 as the wash water is recycled from the one to the other washing stage, clear water being used in the final high-level cleaning stage.
In this connection, it should be observed, however, that, if necessary, water recycled to the various stages can undergo particular cleaning treatments.
Concerning the operation and process conditions, reference can also be had to the aforementioned Italian Patents, since the third stage of the cyclone-washing takes place in a way similar to that of the first washing stage.
In order that the features and advantages of the invention may be better understood, two practical embodiments of the relevant proce-dure will be illustrated hereinafter.
The apparatus and the procedure of the invention are used to purify the fumes coming from a coal-fired power station: a typical concentration of dusts (ash) in the fumes is in the order of magn;tude of 20,000 milligrams (mg) per normal cubic meter (Nm ).
By adopting the installation and the procedure outlined hereinbefore, the final dust concentration in the flues drastically drops to as little as 40 mg/Nm .
By comparison, with the prior art installations and procedures, including those referred to above, the dust-stripped flues still contained as many as 100 mg/Nm3 of dusts. This means that the purifying efficiency of the procedure and installation accord~ng to the present lnvention is more than twice that of the prior art approaches: stated another way, the degree of dust removal is as high as 99,8% with the instant process and installation, as compared with 99,5% obtainable with the prior art methods and installations.
. ~319~7 As regards the removal of sulphur dioxide, the prior art arrived at removing, from an initial S02 content in the flues of 4,000 mg/Nm , only an amount corresponding to a final S02 concentration of 800-1,000 mg/Nm , corresponding to 80%-70% removal, respectively, whereas the process and the installation according to the present invention permit to obtain final concentrations of sulphur dioxide as low as 400 mg/Nm , corresponding to a 90% removal.
Also in this case, therefore, the removal efficiency of the process and installation according to the present invention is at least twice that obtainable with the prior art teachings.
. . _ The fumes ex;ting a purification installation for Fe-Si alloys usually contain 15,000 mg/Nm of dusts: these can be reduced, with the process and installation according to the invention, to as few as 30 mg/Nm , that which corresponds to a degree of stripping as high as 99,8%, as compared with 99% removal of the prior art, that is, 150 mg/Nm3: it is observed, incidentally, that the dust removal difficul-ty is the more serious~ the smaller the dust particle size is.
As regards gaseousSiF4, from dn initial content of 500 mg/Nm , the invention permits to arrive at as few as 5 mg/Nm3, that which is tantamount to say that the remoYal efficiency is at least 99,0%, as compared with the 95% removal of the prior art, that is 25 mg/Nm ~f residual SiF4.
Modifications and changes can be introduced in the process and the installation according to this invention without depar~ing from the scope thereof: if so desired or nècessary, for example, it is well possible to supplement alkaline reagents not only to the tank 21, but also to the reservoir 23 and to the tank 12.
This invention concerns industrial fumes cleaning and more specifically the capture of polluting dusts and gases (such as SOx, NOx, C12, F , and so forth).
Ai,long known processes and equipments for the same purpose, ~hose disclosed by Italian Patent N. 9~1,166 and 1.045.466 to the same Applicant's name, can be mentioned.
In such patents process and equipment for cleaning fumes at least partially combustible and carrying dusts (essentially metal oxydes) and chiefly the fumes developed by steelmaking are described.
The said processes consist of a post-combustion stage of combustible gases and a dust collection stage by washing (with water or other liquids) in two steps: first step of pre-washing in a saturator and second step of end washing in a Venturi scrubber.
In the frame of the processes and equipments subject matter of the above mentioned Patents, a washing tower is described, divided in two separate parts by a baffle, having the following features:
- a tangential fitting for the inlet of the fumes to be cleaned in the upper portion of the washing tower, which operates as a saturator;
- a header with nozzles spraying water in cross-current to the fumes rising according to spiral flow pattern, as in a cyclone washer;
- a Venturi scrubber outside the tower and connected to this latter by two elbow ducts: the upper one between the saturator outlet and the convergent portion of the Venturi pipe, the lower between the divergent portion of the Venturi pipe and the tangential inlet into the lower part of the washing tower;
~k ' - a tangential inlet for the cleaned fumes in the lower portion of the tower in order to collect the finest droplets.
Inasmuch as the industrial fumes, especially the flue gases from combustion of coal and/or fuel oil, e.g. in the production of steam and/or electrical power, contain dusts, prevailingly metal oxides, and acid gases, the industrial and social importance of any improvement of the cleaning degree become evident.
In accordance with the invention, it has been discovered that if a third cyclone-type washing stage is added to the process and equipment as disclosed in the above said Italian Patents downstream the Venturi scrubber, further improvements of the cleaning degree are achieved with minimum additional operating costs and no increase of washing water cansumption.
ThereEore, the present invention provides a process for industrial fumes or gases cleaning, in which the fumes and gases are submitted to a first washing with water in a cyclonic-scrubber operating as a saturator, and then to a second washing with water in a Venturi scrubber, wherein:
(a) the fumes or gases exiting the Venturi scrubber are washed with water in a second cyclonic-scrubber;
(b) the exhaust water exiting the first cyclonic scrubher is purified and sent to a settling tank;
(c) the second cyclonic-scrubber is fed with the puri~ied water exiting said settling tank;
(d) the water exiting the V~nturi scrubbar is fed to the first cyclonic scrubber, and (e) the exhaust water exiting the third cyclonic scrubber is fed to the Venturi scrubber.
The invention also provides an equipment for industrial fumes or gases cleaning, comprising:
~3~9097 (a) a first cyclonic scrubber in which the fumes or gases are washed with wash water;
(b) a Venturi scrubber downstream of (a), in which the fumes or gases are also washed with wash water;
and (c) a second cyclonic scrubber downstream of (b), in which the fumes or gases are further washed with wash water;
wherein said first and said second cyclonic scrubbers are two discrete axially superposed sections composing a single cyclonic washing tower, each individual section having a sloped bottom wall for collecting and draining the wash water.
The typical features and advantages of this invention are cleared up by the following detailed description, reEerring to the accompanying drawing, which shows diagrammatically and exemplary embodiment of the equipment according to the invention.
Having now reference to the drawing, a washing tower 1 is shown, partitioned by a sloping baffle 2 in an upper washing section lA and a lower washing section lB.
The baffle 2 is sloping in æuch a way as to convey water falling on it to a drain 3. The reference numeral 4 indicates the inlet of the fumes to be cleaned and the reference numeral 5 indicates the outlet from the section lA
for the fumes processed inside the same section.
The washing of the fumes is made by a æpraying pipe 6 which delivers radial jets of water, fed through the pipe 8 by the pump 7.
From the outlet 5 the fumes go through an elbow 5A
into the Venturi scrubber 9 consisting of an upstream, or convergent, i319~97 section 9B~ a narrow section 9A to which wash water is fed through the pipe 10 by the pump 11 and a downstream, or divergent, section 9C.
From the elbow 13A of the Yenturi scrubber the water separated due to centrifugal effect is collected and discharged into a tan~ 12 from which it is drawn by the pump 7.
The fumes or gases from the outlet 13 of the Venturi scrubber 9 enter the lower section 18 of the washing tower 1 where a washing process, almost in the same way as in the upper section lA, is carried out by the spraying pipe 14 fed with pressure water through the pipe 15 by the pump 16.
The water collected on the sloping bottom 17 o~ the section lB feeds the pump 11 and the cleaned fumes intaken by the fan 18 through the duct 20 are exhausted to the atmosphere through the stack 19.
The wash water discharged from the first cyclone washing device (section lA) goes to a tank 21, wherein it is preferably neutralized with an alkaline reagent, e.g. lime, and is sent to a settliny and washing tank 22 whose water feeds the pump 16 through the reservoir 23, whilst the sludges are removed and disposed of in the usual way.
Finally through the tube 24 it is possible to restore the washing water.
From the above stated description two important features of this invention appear clearly:
a) an improvement of the cleaning degree of the fumes, which approach 99-99,5X referred to the dusts and 92-98X referred to the polluting gases and vapours, whilst by the prior art a cleaning degree of g8-99% for the dusts and 60-92% for the gases and vapours was achieved;
- l3~as7 h) a subs~antial saving of water9 as the wash water is recycled from the one to the other washing stage, clear water being used in the final high-level cleaning stage.
In this connection, it should be observed, however, that, if necessary, water recycled to the various stages can undergo particular cleaning treatments.
Concerning the operation and process conditions, reference can also be had to the aforementioned Italian Patents, since the third stage of the cyclone-washing takes place in a way similar to that of the first washing stage.
In order that the features and advantages of the invention may be better understood, two practical embodiments of the relevant proce-dure will be illustrated hereinafter.
The apparatus and the procedure of the invention are used to purify the fumes coming from a coal-fired power station: a typical concentration of dusts (ash) in the fumes is in the order of magn;tude of 20,000 milligrams (mg) per normal cubic meter (Nm ).
By adopting the installation and the procedure outlined hereinbefore, the final dust concentration in the flues drastically drops to as little as 40 mg/Nm .
By comparison, with the prior art installations and procedures, including those referred to above, the dust-stripped flues still contained as many as 100 mg/Nm3 of dusts. This means that the purifying efficiency of the procedure and installation accord~ng to the present lnvention is more than twice that of the prior art approaches: stated another way, the degree of dust removal is as high as 99,8% with the instant process and installation, as compared with 99,5% obtainable with the prior art methods and installations.
. ~319~7 As regards the removal of sulphur dioxide, the prior art arrived at removing, from an initial S02 content in the flues of 4,000 mg/Nm , only an amount corresponding to a final S02 concentration of 800-1,000 mg/Nm , corresponding to 80%-70% removal, respectively, whereas the process and the installation according to the present invention permit to obtain final concentrations of sulphur dioxide as low as 400 mg/Nm , corresponding to a 90% removal.
Also in this case, therefore, the removal efficiency of the process and installation according to the present invention is at least twice that obtainable with the prior art teachings.
. . _ The fumes ex;ting a purification installation for Fe-Si alloys usually contain 15,000 mg/Nm of dusts: these can be reduced, with the process and installation according to the invention, to as few as 30 mg/Nm , that which corresponds to a degree of stripping as high as 99,8%, as compared with 99% removal of the prior art, that is, 150 mg/Nm3: it is observed, incidentally, that the dust removal difficul-ty is the more serious~ the smaller the dust particle size is.
As regards gaseousSiF4, from dn initial content of 500 mg/Nm , the invention permits to arrive at as few as 5 mg/Nm3, that which is tantamount to say that the remoYal efficiency is at least 99,0%, as compared with the 95% removal of the prior art, that is 25 mg/Nm ~f residual SiF4.
Modifications and changes can be introduced in the process and the installation according to this invention without depar~ing from the scope thereof: if so desired or nècessary, for example, it is well possible to supplement alkaline reagents not only to the tank 21, but also to the reservoir 23 and to the tank 12.
Claims (3)
1. A process for industrial fumes or gases cleaning, in which the fumes and gases are submitted to a first washing with water in a first cyclonic-scrubber operating as a saturator, and then to a second washing with water in a Venturi scrubber, wherein:
(a) the fumes or gases exiting the Venturi scrubber are washed with water in a second cyclonic-scrubber;
(b) the exhaust water exiting the first cyclonic scrubber is purified and sent to a settling tank;
(c) the second cyclonic-scrubber is fed with the purified water exiting said settling tank;
(d) the water exiting the Venturi scrubber, is fed to the first cyclonic scribber, and (e) the exhaust water exiting the second cyclonic scrubber is fed to the Venturi scrubber.
(a) the fumes or gases exiting the Venturi scrubber are washed with water in a second cyclonic-scrubber;
(b) the exhaust water exiting the first cyclonic scrubber is purified and sent to a settling tank;
(c) the second cyclonic-scrubber is fed with the purified water exiting said settling tank;
(d) the water exiting the Venturi scrubber, is fed to the first cyclonic scribber, and (e) the exhaust water exiting the second cyclonic scrubber is fed to the Venturi scrubber.
2. An e~uipment for industrial fumes or gases cleaning, comprising:
(a) a first cyclonic scrubber in which the fumes or gases are washed with wash water;
(b) a Venturi scrubber downstream of (a), in which the fumes or gases are also washed with wash water;
and (c) a second cyclonic scrubber downstream of (b), in which the fumes or gases are ~urther washed with wash water;
wherein said first and said second cyclonic scrubbers are two discrete axially superposed sections composing a single cyclonic washing tower, each individual section having a sloped bottom wall for collecting and draining the wash water.
(a) a first cyclonic scrubber in which the fumes or gases are washed with wash water;
(b) a Venturi scrubber downstream of (a), in which the fumes or gases are also washed with wash water;
and (c) a second cyclonic scrubber downstream of (b), in which the fumes or gases are ~urther washed with wash water;
wherein said first and said second cyclonic scrubbers are two discrete axially superposed sections composing a single cyclonic washing tower, each individual section having a sloped bottom wall for collecting and draining the wash water.
3. This equipment according to claim 2, further comprising an axially installed spray tube for each section of said cyclonic washing tower to deliver radial water jets, and fume- or gas-inlet fitting in each of said sections, said fitting being arranged in such a manner as to impart a helical motion to the fumes or gases along the respective washing tower section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT20902/87A IT1204713B (en) | 1987-06-15 | 1987-06-15 | PROCEDURE AND APPARATUS FOR THE PURIFICATION OF INDUSTRIAL SMOKES |
| IT20902A/87 | 1987-06-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1319097C true CA1319097C (en) | 1993-06-15 |
Family
ID=11173800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000568940A Expired - Fee Related CA1319097C (en) | 1987-06-15 | 1988-06-08 | Process and equipment for cleaning industrial fumes |
Country Status (4)
| Country | Link |
|---|---|
| CA (1) | CA1319097C (en) |
| DE (1) | DE3820398A1 (en) |
| GB (1) | GB2205766A (en) |
| IT (1) | IT1204713B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201700099594A1 (en) * | 2017-09-06 | 2019-03-06 | Tre P Eng S R L | SYSTEM FOR THE TREATMENT OF COMBUSTION PRODUCTS |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT961166B (en) * | 1972-05-10 | 1973-12-10 | Tecnochim Srl | PROCESS AND EQUIPMENT FOR THE PURIFICATION OF GAS |
| IT1045466B (en) * | 1973-04-11 | 1980-05-10 | Tecnochin S R L | PROCESS IMPROVEMENTS AND GAS PURIFICATION EQUIPMENT |
-
1987
- 1987-06-15 IT IT20902/87A patent/IT1204713B/en active
-
1988
- 1988-06-08 CA CA000568940A patent/CA1319097C/en not_active Expired - Fee Related
- 1988-06-09 GB GB08813634A patent/GB2205766A/en not_active Withdrawn
- 1988-06-15 DE DE3820398A patent/DE3820398A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE3820398C2 (en) | 1992-04-16 |
| DE3820398A1 (en) | 1988-12-29 |
| IT8720902A0 (en) | 1987-06-15 |
| GB8813634D0 (en) | 1988-07-13 |
| IT1204713B (en) | 1989-03-10 |
| GB2205766A (en) | 1988-12-21 |
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| Date | Code | Title | Description |
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| MKLA | Lapsed |