CA2390905C - Method and apparatus for scrubbing gas vented from a vacuum truck - Google Patents
Method and apparatus for scrubbing gas vented from a vacuum truck Download PDFInfo
- Publication number
- CA2390905C CA2390905C CA002390905A CA2390905A CA2390905C CA 2390905 C CA2390905 C CA 2390905C CA 002390905 A CA002390905 A CA 002390905A CA 2390905 A CA2390905 A CA 2390905A CA 2390905 C CA2390905 C CA 2390905C
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- CA
- Canada
- Prior art keywords
- interior
- scrubbing
- inlet
- vacuum
- tank
- 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
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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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
- B01D53/04—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 by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/45—Gas separation or purification devices adapted for specific applications
- B01D2259/455—Gas separation or purification devices adapted for specific applications for transportable use
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/45—Gas separation or purification devices adapted for specific applications
- B01D2259/4566—Gas separation or purification devices adapted for specific applications for use in transportation means
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Cleaning In General (AREA)
- Treating Waste Gases (AREA)
Abstract
An apparatus and a method for scrubbing gas vented from a vacuum truck that creates less back pressure. A first step involves providing an elongate tank disposed in a horizontal orientation and having an interior, a top, and a bottom. An inlet is positioned adjacent the bottom. An outlet is positioned adjacent the top. A porous bed for particulate solids scrubbing medium is disposed within the interior in a position intermediate the top and the bottom. Gas entering the inlet freely flows the length of the interior but must pass through the scrubbing medium in order to reach the outlet. A second step involves venting a vacuum discharge of a vacuum truck into the inlet of the elongate tank.
Description
TIT?~E OF THE INVENTION
Method and Appara:~tus fo r scrubbing gas vented from a vacuum truck FIE?~D OF THE INVENTION
The present invt~~ntion relates to a method and an apparatus for scrubbin~.~ ;has vente:d from a vacuum t=ruck BACKGROUND OF THE INVENTION
to A vacuum truck uses a vacuum pump to draw liquids into a tank on the truck. Ir:. the process of doing so gas is vented to atmosphere through the vacuum discharge. Depending upon the liquid being hazo.dled, the gas vented to atmosphere through the vacuum discharge may contain toxic chemicals.
For example, in the oil industry the gas vented may contain hydrogen sulphide, beruzene, toluene, :~~.ilene and the l,~ke.
The vacuum oa vacuu:v. ~~ruck tends to promote gas breakout, releasing thE: toxic chemicals. Some chem.~_cals, such as hydrogen sulphide, a:re extremely hazardous even in low 2o concentration:;. It is advisable, when toxic chemicals may be present, to scrub the ~:~a:a prior to venting it to atmosphere.
In indu:~trial prc:~cesses scrubbing towers are used which contain a particulate solid scrubbing agent. When the high flow rates produced lv~y a vacuum truck are passed through a scrubbing tower, a sui>stantial. backpressure is created. This backpressure leads t::~~ bea.ri_ng failure in the pumps, overheating oa= the pumps, and a triggering of pressure relief valves. for this reason scrubbing towers are not currently 3o used with vacuum trucks. In order to reduce the amount of backpressure created, attempts have been made to use a liquid scrubbing agent. Thr..~ results obtained through the use of liquid scrubbing ageni:s have not been satisfactory. Problems are still encountered with backpressure. In some applications, the licruid scrubbing agents produce hazardous byproducts. For ex~7ml~~:Le, liqaicl amonia which is commonly used in the treatment of hydrogen sulphide produces a toxic byproduct in the form ~of amonia sulphate. Due tc the lack of a suitable method and apparatus fox scrubbing gas vented from a vacuum truck, most ~~acuum trucks continue to vent directly to atmosphere.
SU1~1ARY OF THE INVENTIOl~
What is required :is a method and apparatus for scrubbing gas vented from a z~~acuum truck which creates less back 1o pressure.
Accordiru~ to one aspect: of. t:he present invention there is provided a method for scrubbing gas vented from a vacuum truck. A f~_rst step invo=Lves providing an elongate tank disposed in a horizon;:a, l_ ori.entat ion arid hav_i.ng an interior, a top, and .a bottom. An inlet is positior_ed adjacent the bottom. An outlet i:~ pcsitioned adjacent tyke top. A porous bed for par-ciculate solids scrubbing medium is disposed within the interior ~.n a position intermediate the top and the bottom. Gas entering the inlet freely flows the length of the interior but m~.zst pass through the scrubbing medium in order to reach the o~.atlet. A second step involves venting a vacuum discharge of a ~,racuum truck into tree inlet of the elongate tank..
According t~.o ar:oi:_~~er aspect: of the present invention there is provided an apparatus for scrubbing gas vented from a vacuum truck in five faun c:~ the elongate tank described above.
The method an<a apparatus, as described above are effective dug to the ~=act t:hat the horizontal orientation of the tank creates a i.ong porous bed which provides a greater interface area betwcee n the incoming gas and the scrubbing agent.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other ':e~~tures c.f the invention will become more apparent= f.r_om t.hc:e following description in which reference is n~.ade to t:ue appended drawings, the drawings are for the purpose of illmstration only and are not intended to in any way limit l~,he st_:ope of the '~nvent:Lon to the particular embodiment or embodimeruts shown, wherein:
FIGURE 1 is a si~:~e e_i.evation view of an apparatus; for scrubbing gas vented t:z-om a vacuum truck constructed in 1o accordance with tree te~ac.rlings of the present invention.
FIGURE 2 is a s~ d~e el.evat=ion view, in section of the apparatus ill~.zstrated ~...r. FIGURE 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred emb::>cli.ment, an apparatus for scrubbing gas vented from a vacuum truck generaliy idt~ntified by reference numeral 10, will now be described with reference to FIGURES 1 through 2.
Structure and Rel,:~t:ionship of Parts:
Referring to FIGURE'. 1, there i_s provided an apparatus for scrubbing gas vent~::~d from a vacuum truck 10 which includes an elongate t,:mk 12 that i.s disposed in a horizontal orientation. Referrin;:_~ t:o FIGURE 2, in the illustrated embodiment, elongate t,:~nk 12 has an interior 14, a top 16, and a bottom 18. 'rank 1.2 has a first en:~ 20 and a second end 22, an inlet 24 positi.~::>r~.ed adjacent. bottc)m 18 at first end 20 of tank 12 anc, an outlet 26 positioned adjacent top 16 3o towards second end 22 of hank 12. A porous bed 28 for particulate s~~lids scr~.zbaing medium is d:Lsposed within interior 14 arid extend::> from fix-st end 20 t.o second end 22 of tank 12 in a r>osition v~ritermediate top 1~ and bottom 18, such that, in the ~~referred embodiment, gas entering inlet 24 can freely flow the length of interior 14 but must. pass up through porou~~ bed 28 ~~c;r- particulate solids scrubbing medium in order to reach outlet 26. Porous bed 28 is supported in interior 14 of tank 12 by a frame 30 with legs 32. A conduit 34 is connected to inlE.t 24 and extends from first end 20 to second end 22 of t:ank ~..2. C:onduit 39 i.:~ spacec:i from bottom 18 of tank 12 but stir:. positioned below porous bed 28.
Conduit 34 is supported. in position i.n int.erior 14 of tank 12 by supporting legs 36. Conduit :54 has spaced apart slots 38 that permit gas entering conduit 34 at :inlet 24 to exit conduit 34 be_Low porous bed 28. An access door 40 is provided at second end 22 of tank 12 and an access door 42 is provided in top 16 of tank 12 tc> provide access ro inte.rior 14 of tank 12 for maintenance or :repair. A detachable hose 44 is provided which is adap-::eci to be sec;used 1~0 outlet 26 of tank 12. Referring to FIGURE 1. detachable hose 44 is secured to an exterior sidewall 4c> of tank 12 for storage when not i.n use or during transport::at.ion.
Referring to FIGURE 1, in the illustrated embodiment, elongate tank 12 is mounted to a trai=L.er frame 48 with wheels 50 for ease of transportation. Trailer frame 48 has a hitch 52 which is adap~t:ed for securing apparatus 10 to a tow vehicle 54. Referring to FIGURE 2, trailer frame 48 also has a jack 56 for maintaining tank la? in horizontal orientation when trailer :game 48 is not hit:.c~hed ~o tow vehicle 54 illustrated in FIGURE 1.
Operation:
The use and c>perati.on of apparatus for scrubbing gas vented from a vacuum truck generally identified by reference numeral 10, will now he descrp.b~sd with referencJe to FIGURES 1 through 2. Referring to FIGURE 1, there is illustrated an apparatus for scrubbing gas ver:.i~~ed from a vacuum truck. Referring to FIGURE 2, a vacuum discharge 58 c~.f a vacuum truck is vented into inlet 24 of elongate tank 12, as described above. Hose 44 is connected to ot;t:Let 2~ of tank 12. Gas enters through inlet 24 of elongate tank 12 and freely flow the length of conduit 34 posi.tioner:l in interior 14 of t:;ank 12. In the J
preferred embodimE:nt, ~.~ases exit conduit 34 through slogs 38 but then must pass up tlorough porous bed 28 for_ particulate solids scrubb_Lng medi.~_~m in order to reach outlet 26 of elongate tank 12. Arrows 60 indicate t:he direction of the flow of gas. Horizont:a:l. orient:.ation of: tank 12 with long porous bed 28 extendinc:3 from first end 20 to second end 22 of tank 12 results in a c~r_eat:er interface area between the incoming gas and the sc:wubbing agent.
In the event that there is a blockage whereby the flow ~o of gas is pre~Tented fr~~>rr exiting througr~ outlet 26, pressure will build wit:hin tank lc. To al~_eviate pressure build up, pressure release vents Es dare pr~>vided in top 16 of tank 12.
Pressure rele<~se vents E_>a.' have caps 64 which will release to allow for pressure tc:, be released from tank 12 through pressure release gents b2.
In this patent dc:;cument, t:~e word "comprising" is used in its non-limiting s<:~nse to mean that items following the word are included, but:, items not specifically mentioned are not excluded. A refe~erlce to an element by the indefinite article "a" does not Eexo::lude the possi.bil:ity that more than one of the e=_ement i_:, present, unless the context clearly requires that theoe be on a and only one of the elements.
It will be appai:vent to one skilled in the art that modifications may be made tc the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter de:Eined i.n the Claims.
Method and Appara:~tus fo r scrubbing gas vented from a vacuum truck FIE?~D OF THE INVENTION
The present invt~~ntion relates to a method and an apparatus for scrubbin~.~ ;has vente:d from a vacuum t=ruck BACKGROUND OF THE INVENTION
to A vacuum truck uses a vacuum pump to draw liquids into a tank on the truck. Ir:. the process of doing so gas is vented to atmosphere through the vacuum discharge. Depending upon the liquid being hazo.dled, the gas vented to atmosphere through the vacuum discharge may contain toxic chemicals.
For example, in the oil industry the gas vented may contain hydrogen sulphide, beruzene, toluene, :~~.ilene and the l,~ke.
The vacuum oa vacuu:v. ~~ruck tends to promote gas breakout, releasing thE: toxic chemicals. Some chem.~_cals, such as hydrogen sulphide, a:re extremely hazardous even in low 2o concentration:;. It is advisable, when toxic chemicals may be present, to scrub the ~:~a:a prior to venting it to atmosphere.
In indu:~trial prc:~cesses scrubbing towers are used which contain a particulate solid scrubbing agent. When the high flow rates produced lv~y a vacuum truck are passed through a scrubbing tower, a sui>stantial. backpressure is created. This backpressure leads t::~~ bea.ri_ng failure in the pumps, overheating oa= the pumps, and a triggering of pressure relief valves. for this reason scrubbing towers are not currently 3o used with vacuum trucks. In order to reduce the amount of backpressure created, attempts have been made to use a liquid scrubbing agent. Thr..~ results obtained through the use of liquid scrubbing ageni:s have not been satisfactory. Problems are still encountered with backpressure. In some applications, the licruid scrubbing agents produce hazardous byproducts. For ex~7ml~~:Le, liqaicl amonia which is commonly used in the treatment of hydrogen sulphide produces a toxic byproduct in the form ~of amonia sulphate. Due tc the lack of a suitable method and apparatus fox scrubbing gas vented from a vacuum truck, most ~~acuum trucks continue to vent directly to atmosphere.
SU1~1ARY OF THE INVENTIOl~
What is required :is a method and apparatus for scrubbing gas vented from a z~~acuum truck which creates less back 1o pressure.
Accordiru~ to one aspect: of. t:he present invention there is provided a method for scrubbing gas vented from a vacuum truck. A f~_rst step invo=Lves providing an elongate tank disposed in a horizon;:a, l_ ori.entat ion arid hav_i.ng an interior, a top, and .a bottom. An inlet is positior_ed adjacent the bottom. An outlet i:~ pcsitioned adjacent tyke top. A porous bed for par-ciculate solids scrubbing medium is disposed within the interior ~.n a position intermediate the top and the bottom. Gas entering the inlet freely flows the length of the interior but m~.zst pass through the scrubbing medium in order to reach the o~.atlet. A second step involves venting a vacuum discharge of a ~,racuum truck into tree inlet of the elongate tank..
According t~.o ar:oi:_~~er aspect: of the present invention there is provided an apparatus for scrubbing gas vented from a vacuum truck in five faun c:~ the elongate tank described above.
The method an<a apparatus, as described above are effective dug to the ~=act t:hat the horizontal orientation of the tank creates a i.ong porous bed which provides a greater interface area betwcee n the incoming gas and the scrubbing agent.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other ':e~~tures c.f the invention will become more apparent= f.r_om t.hc:e following description in which reference is n~.ade to t:ue appended drawings, the drawings are for the purpose of illmstration only and are not intended to in any way limit l~,he st_:ope of the '~nvent:Lon to the particular embodiment or embodimeruts shown, wherein:
FIGURE 1 is a si~:~e e_i.evation view of an apparatus; for scrubbing gas vented t:z-om a vacuum truck constructed in 1o accordance with tree te~ac.rlings of the present invention.
FIGURE 2 is a s~ d~e el.evat=ion view, in section of the apparatus ill~.zstrated ~...r. FIGURE 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred emb::>cli.ment, an apparatus for scrubbing gas vented from a vacuum truck generaliy idt~ntified by reference numeral 10, will now be described with reference to FIGURES 1 through 2.
Structure and Rel,:~t:ionship of Parts:
Referring to FIGURE'. 1, there i_s provided an apparatus for scrubbing gas vent~::~d from a vacuum truck 10 which includes an elongate t,:mk 12 that i.s disposed in a horizontal orientation. Referrin;:_~ t:o FIGURE 2, in the illustrated embodiment, elongate t,:~nk 12 has an interior 14, a top 16, and a bottom 18. 'rank 1.2 has a first en:~ 20 and a second end 22, an inlet 24 positi.~::>r~.ed adjacent. bottc)m 18 at first end 20 of tank 12 anc, an outlet 26 positioned adjacent top 16 3o towards second end 22 of hank 12. A porous bed 28 for particulate s~~lids scr~.zbaing medium is d:Lsposed within interior 14 arid extend::> from fix-st end 20 t.o second end 22 of tank 12 in a r>osition v~ritermediate top 1~ and bottom 18, such that, in the ~~referred embodiment, gas entering inlet 24 can freely flow the length of interior 14 but must. pass up through porou~~ bed 28 ~~c;r- particulate solids scrubbing medium in order to reach outlet 26. Porous bed 28 is supported in interior 14 of tank 12 by a frame 30 with legs 32. A conduit 34 is connected to inlE.t 24 and extends from first end 20 to second end 22 of t:ank ~..2. C:onduit 39 i.:~ spacec:i from bottom 18 of tank 12 but stir:. positioned below porous bed 28.
Conduit 34 is supported. in position i.n int.erior 14 of tank 12 by supporting legs 36. Conduit :54 has spaced apart slots 38 that permit gas entering conduit 34 at :inlet 24 to exit conduit 34 be_Low porous bed 28. An access door 40 is provided at second end 22 of tank 12 and an access door 42 is provided in top 16 of tank 12 tc> provide access ro inte.rior 14 of tank 12 for maintenance or :repair. A detachable hose 44 is provided which is adap-::eci to be sec;used 1~0 outlet 26 of tank 12. Referring to FIGURE 1. detachable hose 44 is secured to an exterior sidewall 4c> of tank 12 for storage when not i.n use or during transport::at.ion.
Referring to FIGURE 1, in the illustrated embodiment, elongate tank 12 is mounted to a trai=L.er frame 48 with wheels 50 for ease of transportation. Trailer frame 48 has a hitch 52 which is adap~t:ed for securing apparatus 10 to a tow vehicle 54. Referring to FIGURE 2, trailer frame 48 also has a jack 56 for maintaining tank la? in horizontal orientation when trailer :game 48 is not hit:.c~hed ~o tow vehicle 54 illustrated in FIGURE 1.
Operation:
The use and c>perati.on of apparatus for scrubbing gas vented from a vacuum truck generally identified by reference numeral 10, will now he descrp.b~sd with referencJe to FIGURES 1 through 2. Referring to FIGURE 1, there is illustrated an apparatus for scrubbing gas ver:.i~~ed from a vacuum truck. Referring to FIGURE 2, a vacuum discharge 58 c~.f a vacuum truck is vented into inlet 24 of elongate tank 12, as described above. Hose 44 is connected to ot;t:Let 2~ of tank 12. Gas enters through inlet 24 of elongate tank 12 and freely flow the length of conduit 34 posi.tioner:l in interior 14 of t:;ank 12. In the J
preferred embodimE:nt, ~.~ases exit conduit 34 through slogs 38 but then must pass up tlorough porous bed 28 for_ particulate solids scrubb_Lng medi.~_~m in order to reach outlet 26 of elongate tank 12. Arrows 60 indicate t:he direction of the flow of gas. Horizont:a:l. orient:.ation of: tank 12 with long porous bed 28 extendinc:3 from first end 20 to second end 22 of tank 12 results in a c~r_eat:er interface area between the incoming gas and the sc:wubbing agent.
In the event that there is a blockage whereby the flow ~o of gas is pre~Tented fr~~>rr exiting througr~ outlet 26, pressure will build wit:hin tank lc. To al~_eviate pressure build up, pressure release vents Es dare pr~>vided in top 16 of tank 12.
Pressure rele<~se vents E_>a.' have caps 64 which will release to allow for pressure tc:, be released from tank 12 through pressure release gents b2.
In this patent dc:;cument, t:~e word "comprising" is used in its non-limiting s<:~nse to mean that items following the word are included, but:, items not specifically mentioned are not excluded. A refe~erlce to an element by the indefinite article "a" does not Eexo::lude the possi.bil:ity that more than one of the e=_ement i_:, present, unless the context clearly requires that theoe be on a and only one of the elements.
It will be appai:vent to one skilled in the art that modifications may be made tc the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter de:Eined i.n the Claims.
Claims (2)
1. A method for scrubbing gas vented from a vacuum truck, comprising the steps of:
providing an elongate tank disposed in a horizontal orientation and having an interior, a top, a bottom, an inlet positioned adjacent the bottom, an outlet adjacent the top, and a porous bed for particulate solids scrubbing medium disposed within the interior in a position intermediate the top and the bottom, such that gas entering the inlet can freely flow the length of the interior but must pass up through the scrubbing medium in order to reach the outlet;
and venting a vacuum discharge of a vacuum truck into the inlet of the elongate tank.
providing an elongate tank disposed in a horizontal orientation and having an interior, a top, a bottom, an inlet positioned adjacent the bottom, an outlet adjacent the top, and a porous bed for particulate solids scrubbing medium disposed within the interior in a position intermediate the top and the bottom, such that gas entering the inlet can freely flow the length of the interior but must pass up through the scrubbing medium in order to reach the outlet;
and venting a vacuum discharge of a vacuum truck into the inlet of the elongate tank.
2. An apparatus for scrubbing gas vented from a vacuum truck, comprising:
an elongate tank disposed in a horizontal orientation and having an interior, a top, a bottom, an inlet positioned adjacent the bottom, an outlet adjacent the top, and a porous bed for particulate solids scrubbing medium disposed within the interior in a position intermediate the top and the bottom, such that gas entering the inlet can freely flow the length of the interior but must pass up through the scrubbing medium in order to reach the outlet.
an elongate tank disposed in a horizontal orientation and having an interior, a top, a bottom, an inlet positioned adjacent the bottom, an outlet adjacent the top, and a porous bed for particulate solids scrubbing medium disposed within the interior in a position intermediate the top and the bottom, such that gas entering the inlet can freely flow the length of the interior but must pass up through the scrubbing medium in order to reach the outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002390905A CA2390905C (en) | 2002-06-19 | 2002-06-19 | Method and apparatus for scrubbing gas vented from a vacuum truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002390905A CA2390905C (en) | 2002-06-19 | 2002-06-19 | Method and apparatus for scrubbing gas vented from a vacuum truck |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2390905A1 CA2390905A1 (en) | 2002-12-21 |
| CA2390905C true CA2390905C (en) | 2004-01-20 |
Family
ID=4171177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002390905A Expired - Lifetime CA2390905C (en) | 2002-06-19 | 2002-06-19 | Method and apparatus for scrubbing gas vented from a vacuum truck |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2390905C (en) |
-
2002
- 2002-06-19 CA CA002390905A patent/CA2390905C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2390905A1 (en) | 2002-12-21 |
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|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20220620 |