CA1125671A - Natural gas filtering device - Google Patents
Natural gas filtering deviceInfo
- Publication number
- CA1125671A CA1125671A CA359,596A CA359596A CA1125671A CA 1125671 A CA1125671 A CA 1125671A CA 359596 A CA359596 A CA 359596A CA 1125671 A CA1125671 A CA 1125671A
- Authority
- CA
- Canada
- Prior art keywords
- outlet
- inlet
- pipe
- gas
- filter 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/30—Particle separators, e.g. dust precipitators, using loose filtering material
-
- 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
- B01D53/26—Drying gases or vapours
- B01D53/266—Drying gases or vapours by filtration
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A gas filtering apparatus comprising a filter tank, baffles, a porous filter bed and means for collecting filtered impurities is provided.
The filter tank has an inlet and an outlet for gas flow through the tank from the inlet to the outlet, baffles within the tank at least a majority of which the gas must flow through and positioned such that the baffles deflect the gas flow, and, a porous filter bed within the tank positioned such that the gas must flow through the filter bed. The means for collecting the filtered impurities preferably comprises a holding tank having an inlet and an outlet drainage pipe connecting the holding tank to the filter tank, and a means for selectively obstructing the holding tank outlet. The apparatus of the invention may be used to filter both moisture such as water vapour and solid particulate impurities such as sand, wax and dirt from natural gas.
A gas filtering apparatus comprising a filter tank, baffles, a porous filter bed and means for collecting filtered impurities is provided.
The filter tank has an inlet and an outlet for gas flow through the tank from the inlet to the outlet, baffles within the tank at least a majority of which the gas must flow through and positioned such that the baffles deflect the gas flow, and, a porous filter bed within the tank positioned such that the gas must flow through the filter bed. The means for collecting the filtered impurities preferably comprises a holding tank having an inlet and an outlet drainage pipe connecting the holding tank to the filter tank, and a means for selectively obstructing the holding tank outlet. The apparatus of the invention may be used to filter both moisture such as water vapour and solid particulate impurities such as sand, wax and dirt from natural gas.
Description
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N~TURAL G~S FILTERING ~PP~R~TUS
This invention relates to an apparatus for filtering suspended impurities from gas and, more particularly, to a device that may be used to filter both moisture such as water vapour and solid particulate impurities such as sand, wax and dirt from natural gas.
It is common in devices for filtering natural gas to pass the gas through a filter bed thereby removing suspended impurities. Devices of this type, however, are inefficient because accumulated impurities tend to clog the bed thereby inhibiting gas flow and requiring the devices to be frequently disconnected from the gas supply in order that the bed may be replaced or cleaned. Moreover, devices are unsatisfactory for the removal of moisture from gas as moisture tends not to precipitate in the filter bed. Difficulty is encountered, in particular, with the removal of fine droplets of moisture.
Further disadvantages of known devices include low capacity, difficulty with respect to installation, decreased Eilter efficiency at hi~h gas pressure and a narrow range of applications ~ith respect to the type of gas filtered and the gas transportation system to which the device may be joined.
l`he separation of suspended impurities from natural gas is desirable so as to improve tha energy efficiency of the gas as a fuel, improve the efficiency of the gas trans-portation system and prevent impurity related breakdowns in the system. In particular, the accumulation of moisture in either the filtering device or the transportation system may result in freeze-ups at temperatures below the freezing ~ .
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point of the moisture, thereby inhibiting gas flow and increasing the energy required to be expended in piping the gas. Freeze-ups may also descrease fil-tering efficiency and dam~ge both the device and transporation system.
To prevent pipe freeze-up it is known to insert alcohol or some other liquid having a low freezing point into the gas supply so as to lower the freezing point of the moisture. Such a method is not only expensive, but lowers fuel efficiency without hindering pipe freeze-up to any significant extent.
The aforementioned disadvantages may be overcome by the apparatus of the invention which provides a device comprising both baffles and a porous filter bed within a filter tank and means for collecting filtered impurities.
Thus, this invention provides for a gas filtering apparatus for the removal:~rom gas of suspended impurities, selected from the group consisting of moisture, alcohol and solid particulate impuritiesJ and preferably a member selected from the group consisting of sand, wax and dirt particles, comprising a filter tank having an inlet and an outlet for gas flow through the filter tank from the inlet to the outlet, baffles within the Eilter tank at least a majority of which the gas must flow through and positioned such that the baffles inhibit the gas flowJ a porous filter bed within the filter tank positioned such that the gas must flow through the filter bed and means for i collecting the filtered impurities.
The provision of baffles within the filter tank permits the apparatus of the invention to be used in high pressure, high volume filtering applications `; such as those typically encountered in natural gas transportation systems. The baffles deflect the gas flow so as to cause turbulence and assist the porous filter bed in filtering impurities. Perforations, preferably ~" in diameter, are placed in the baffles so as to pe:rmit gas flow through the baffles.
The provlsion of a porous filter bed, which, in a preferred embodiment ~ - 2 -,.
ffjt~
may be comprised of particles of filter material that are resistant to deterioration when subject to liquid or gas under pressure (such as gravel, glass and steel and, which, in a further preferred embodiment may be substantially comprised of particles over one inch in size, permits the filtering of bo~h liquid and solid impurities. The filter bed need only be replaced infrequently and is readily cleanable. Moreover, the particles of filter materials not only filter impurities from the gas but also act as miniature baffles deflecting the gas flow in order to cause turbulence and enhance the filtering efficiency of the device. The provision of particles of filter material substantially grea~er than one inch in diameter permits the apparatus of the invention to be used in high pressure and high volume filtering applications. A suitable filter material such as gravel is in-expensive and readily available.
The invention also includes means for collecting the filtered impur-ities. In a preferred embodiment, the me~ms for collecting the filtered impurities comprises a holding tank and drainage pipe posit:ioned such that the filtered impurities collected in the filter tank may pass ~ - 3 -- , , . - -: '' -- ~' ' - : ' '~ .
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due to gravity Erom the filter tank, through the drainage pipe and into the holding tank. A blowout pipe and valve connecting the holding tank with the atmosphere may be provided so as to enable the removal of impurities collected in the holding tank. Such a means for collecting filtered impurities enhances filtering efficiency in that the filtered impurities do not accumulate in the filter tank thereby hindering gas flow through the apparatus. Liquid impurities are readily filtered from gas as the collection of the impurities in a separate tank prevents them from vaporizing in the filter tank or being blown as a result of gas pressure and volume out of the apparatus and back into the gas transportation system. Thus, very fine droplets of liquid impurities may be filtered. The provision of a blowout pipe and valve attached to the holding tan~ permits the removal of the impurities collected in the tank by allowing the collected impurities to be blown from the apparatus by the gas pressure when the valve is opened. Special pumping of the collected impurities from the device is not required nor is it necessary for the gas flow to be bypassed around the apparatus when it is desired to remove the impurities. The apparatus of the invention thereby permits the continuous filtering of gas.
Collected impurities need not be blown into the atmosphere but may be collected in a suitable vessel for disposal.
Collecting the filtered impurities in a separate holding tank also ensures that the filtering efficiency of the apparatus remains constant.
S6~
In a preferred embodiment of the invention, means comprising a pipe and ~alve arXangement are provided for bypassing the gas flow around the apparatus.
Infrequently, it may be necessary to clean the filter or holding tanks. In a preferred embodiment, wash-out means are provided comprising a wash-out inlet on the filter tank, a filler line pipe connecting the filter tank with the atmosphere and a filler line pipe valve. In conjunction with the bypass and blow-out means, the apparatus of the invention may be cleaned by by-passing the gas around the apparatus by way of the bypass means, filling the apparatus of the invention with a suitable cleansing solution by way of the wash-out means and then blowing the cleansing solution out of the device by opening the blow-out line and redirecting the gas flow back through the apparat.us. The provision of wash-out means enables the device to be cleaned and permits the removal of any accumulated impurities that cannot be removed by the blow-out means~
The apparatus of the invention is easily adaptable . 20 to any type of gas supply or gas transportation system~
The device does not require the substantial alteration of the gas supply or transportation system save for the provision of means to direct the gas flow into the apparatus and back ` into the transportation system or gas source once the filtering function has been completed~ Thus, the device may be easily and quickly installed. In addition, the apparatus is .
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fully reversible in that either the inlet or the outlet of the filter tank may be used as the gas supply source. The simple design of the apparatus ensures that the apparatus may be inexpensively manufactured and not prone to breakdown.
The apparatus of the in~ention may be manufactured from one of a number of materials, but preferably is manufactured from steel. The apparatus is particularly adaptable for natural gas pipeline applications of pressures o:f 1000 pounds per square inch and volumes of gas of 20,000 ft per hour. Means may be provided for the prevention of the corrosion of the apparatus as well as for the release of gas pressure in the apparatus when the pressure becomes excessive.
An advantage of the apparatus o the invention is that the removal of liquid impurities such as water droplets inhibits freeze-up thereby improving the efficiency of the gas transportation system in that gas may be transported at temperatures below the freezing point of the liquid impurities. The apparatus may be prevented from freezing up by installing the apparatus underground below the frost line. Moreover~ the insertion of alcohol or some other liquid with a low freezing point into ~he gas so as to prevent reeze-up is not required. Thus, fuel efficiency is maintained.
The prevention of pipe freeze-up also permits the uninhibited flow of gas through the filtering and gas transportation systems thereby resulting in substantial savings in transporting the gas. Finally the filtering efficiency of the apparatus of the invention remains constant.
$ - 6 -
N~TURAL G~S FILTERING ~PP~R~TUS
This invention relates to an apparatus for filtering suspended impurities from gas and, more particularly, to a device that may be used to filter both moisture such as water vapour and solid particulate impurities such as sand, wax and dirt from natural gas.
It is common in devices for filtering natural gas to pass the gas through a filter bed thereby removing suspended impurities. Devices of this type, however, are inefficient because accumulated impurities tend to clog the bed thereby inhibiting gas flow and requiring the devices to be frequently disconnected from the gas supply in order that the bed may be replaced or cleaned. Moreover, devices are unsatisfactory for the removal of moisture from gas as moisture tends not to precipitate in the filter bed. Difficulty is encountered, in particular, with the removal of fine droplets of moisture.
Further disadvantages of known devices include low capacity, difficulty with respect to installation, decreased Eilter efficiency at hi~h gas pressure and a narrow range of applications ~ith respect to the type of gas filtered and the gas transportation system to which the device may be joined.
l`he separation of suspended impurities from natural gas is desirable so as to improve tha energy efficiency of the gas as a fuel, improve the efficiency of the gas trans-portation system and prevent impurity related breakdowns in the system. In particular, the accumulation of moisture in either the filtering device or the transportation system may result in freeze-ups at temperatures below the freezing ~ .
:. ' `' ' '" :
- . .
7~
point of the moisture, thereby inhibiting gas flow and increasing the energy required to be expended in piping the gas. Freeze-ups may also descrease fil-tering efficiency and dam~ge both the device and transporation system.
To prevent pipe freeze-up it is known to insert alcohol or some other liquid having a low freezing point into the gas supply so as to lower the freezing point of the moisture. Such a method is not only expensive, but lowers fuel efficiency without hindering pipe freeze-up to any significant extent.
The aforementioned disadvantages may be overcome by the apparatus of the invention which provides a device comprising both baffles and a porous filter bed within a filter tank and means for collecting filtered impurities.
Thus, this invention provides for a gas filtering apparatus for the removal:~rom gas of suspended impurities, selected from the group consisting of moisture, alcohol and solid particulate impuritiesJ and preferably a member selected from the group consisting of sand, wax and dirt particles, comprising a filter tank having an inlet and an outlet for gas flow through the filter tank from the inlet to the outlet, baffles within the Eilter tank at least a majority of which the gas must flow through and positioned such that the baffles inhibit the gas flowJ a porous filter bed within the filter tank positioned such that the gas must flow through the filter bed and means for i collecting the filtered impurities.
The provision of baffles within the filter tank permits the apparatus of the invention to be used in high pressure, high volume filtering applications `; such as those typically encountered in natural gas transportation systems. The baffles deflect the gas flow so as to cause turbulence and assist the porous filter bed in filtering impurities. Perforations, preferably ~" in diameter, are placed in the baffles so as to pe:rmit gas flow through the baffles.
The provlsion of a porous filter bed, which, in a preferred embodiment ~ - 2 -,.
ffjt~
may be comprised of particles of filter material that are resistant to deterioration when subject to liquid or gas under pressure (such as gravel, glass and steel and, which, in a further preferred embodiment may be substantially comprised of particles over one inch in size, permits the filtering of bo~h liquid and solid impurities. The filter bed need only be replaced infrequently and is readily cleanable. Moreover, the particles of filter materials not only filter impurities from the gas but also act as miniature baffles deflecting the gas flow in order to cause turbulence and enhance the filtering efficiency of the device. The provision of particles of filter material substantially grea~er than one inch in diameter permits the apparatus of the invention to be used in high pressure and high volume filtering applications. A suitable filter material such as gravel is in-expensive and readily available.
The invention also includes means for collecting the filtered impur-ities. In a preferred embodiment, the me~ms for collecting the filtered impurities comprises a holding tank and drainage pipe posit:ioned such that the filtered impurities collected in the filter tank may pass ~ - 3 -- , , . - -: '' -- ~' ' - : ' '~ .
~L~2~
due to gravity Erom the filter tank, through the drainage pipe and into the holding tank. A blowout pipe and valve connecting the holding tank with the atmosphere may be provided so as to enable the removal of impurities collected in the holding tank. Such a means for collecting filtered impurities enhances filtering efficiency in that the filtered impurities do not accumulate in the filter tank thereby hindering gas flow through the apparatus. Liquid impurities are readily filtered from gas as the collection of the impurities in a separate tank prevents them from vaporizing in the filter tank or being blown as a result of gas pressure and volume out of the apparatus and back into the gas transportation system. Thus, very fine droplets of liquid impurities may be filtered. The provision of a blowout pipe and valve attached to the holding tan~ permits the removal of the impurities collected in the tank by allowing the collected impurities to be blown from the apparatus by the gas pressure when the valve is opened. Special pumping of the collected impurities from the device is not required nor is it necessary for the gas flow to be bypassed around the apparatus when it is desired to remove the impurities. The apparatus of the invention thereby permits the continuous filtering of gas.
Collected impurities need not be blown into the atmosphere but may be collected in a suitable vessel for disposal.
Collecting the filtered impurities in a separate holding tank also ensures that the filtering efficiency of the apparatus remains constant.
S6~
In a preferred embodiment of the invention, means comprising a pipe and ~alve arXangement are provided for bypassing the gas flow around the apparatus.
Infrequently, it may be necessary to clean the filter or holding tanks. In a preferred embodiment, wash-out means are provided comprising a wash-out inlet on the filter tank, a filler line pipe connecting the filter tank with the atmosphere and a filler line pipe valve. In conjunction with the bypass and blow-out means, the apparatus of the invention may be cleaned by by-passing the gas around the apparatus by way of the bypass means, filling the apparatus of the invention with a suitable cleansing solution by way of the wash-out means and then blowing the cleansing solution out of the device by opening the blow-out line and redirecting the gas flow back through the apparat.us. The provision of wash-out means enables the device to be cleaned and permits the removal of any accumulated impurities that cannot be removed by the blow-out means~
The apparatus of the invention is easily adaptable . 20 to any type of gas supply or gas transportation system~
The device does not require the substantial alteration of the gas supply or transportation system save for the provision of means to direct the gas flow into the apparatus and back ` into the transportation system or gas source once the filtering function has been completed~ Thus, the device may be easily and quickly installed. In addition, the apparatus is .
- , ,~ , . .
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fully reversible in that either the inlet or the outlet of the filter tank may be used as the gas supply source. The simple design of the apparatus ensures that the apparatus may be inexpensively manufactured and not prone to breakdown.
The apparatus of the in~ention may be manufactured from one of a number of materials, but preferably is manufactured from steel. The apparatus is particularly adaptable for natural gas pipeline applications of pressures o:f 1000 pounds per square inch and volumes of gas of 20,000 ft per hour. Means may be provided for the prevention of the corrosion of the apparatus as well as for the release of gas pressure in the apparatus when the pressure becomes excessive.
An advantage of the apparatus o the invention is that the removal of liquid impurities such as water droplets inhibits freeze-up thereby improving the efficiency of the gas transportation system in that gas may be transported at temperatures below the freezing point of the liquid impurities. The apparatus may be prevented from freezing up by installing the apparatus underground below the frost line. Moreover~ the insertion of alcohol or some other liquid with a low freezing point into ~he gas so as to prevent reeze-up is not required. Thus, fuel efficiency is maintained.
The prevention of pipe freeze-up also permits the uninhibited flow of gas through the filtering and gas transportation systems thereby resulting in substantial savings in transporting the gas. Finally the filtering efficiency of the apparatus of the invention remains constant.
$ - 6 -
2.~
The removal of suspended impurities f~om natural gas improves the energy e~ficiency of the gas as a fuel, improves the efficiency of the gas transportation system and prevents breakdowns in the system.
Further advantages that may be achieved by use of the invention will become apparent from the following description of a preferred embodiment of the invention, given by way of example only, illustrated in the accompanying drawings.
In drawings which illustrate the preferred embodiment of the invention;
Figure 1 is a side elevation partly in section of the preferred embodiment.
Figure 2 is an end elevation of this embodiment.
Figure 3 illustrates a non-permeable baffle.
Figure 4 illustrates a permeable baffle.
Figure S illustrates a second permeable baffle. ~`
The apparatus illustrated comprises a filter tank 1 adapted for installation in series or in parallel on a natural gas pipeline to provide for a flow of natural gas ; through the apparatus. The filter tank may be joined to the gas pipeline by one of a number of means, but, in the embodiment illustrated, is joined in parallel to the gas pipeline by way of inlet pipe 2 and outlet pipe 3. In this manner, gas flowing through the pipeline may pass in suc-~ cession from the pipeline, through the inlet pipe, the :` .
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filter tank, the outlet pipe and back into the pipeline dol~nstream from the inlet pipe.
A porous filter bed ~ is provided within the filter tank and positioned such that the gas must flow from the inlet pipe through the filter bed (therein being filtered~ and into the outlet pipe. The filter bed is composed of particles of material substantially greater than one inch in diameter that do not or tend not to disintegrate or deteriorate when subject to liquid or gas under pressure, preferably particles of a material selected from the group consisting of gravel, glass and steel.
A series of baffles are arranged within the filter tank so that the gas flow through the filter tank is deflected. In the embodiment illustrated, however, non-permeable baffle 5, illustrated in Figure 3, is secured to the inner wall of the filter tank near the inlet pipe. The gas flow from the inlet pipe is directed by means of a filter tank inner inlet pipe 6 onto the non-permeable baffle such that the gas flow is diverted into the filter bed. Permeable baffles 7 and 8, illustrated in Figures and 5 respectively~ are positioned within the filter tank near the inlet end such that the gas flow passes through the baffle perforations 9.
In the embodiment illustra~ed, the baffle and pipe arrangement within the inlet end of the filter tank is the converse of that within the outlet end of the filter tank. The apparatus of the invention is thereby fully reversible in that either the inlet pipe or the outlet pipe may serve as the gas supply to the apparatus.
The removal of suspended impurities f~om natural gas improves the energy e~ficiency of the gas as a fuel, improves the efficiency of the gas transportation system and prevents breakdowns in the system.
Further advantages that may be achieved by use of the invention will become apparent from the following description of a preferred embodiment of the invention, given by way of example only, illustrated in the accompanying drawings.
In drawings which illustrate the preferred embodiment of the invention;
Figure 1 is a side elevation partly in section of the preferred embodiment.
Figure 2 is an end elevation of this embodiment.
Figure 3 illustrates a non-permeable baffle.
Figure 4 illustrates a permeable baffle.
Figure S illustrates a second permeable baffle. ~`
The apparatus illustrated comprises a filter tank 1 adapted for installation in series or in parallel on a natural gas pipeline to provide for a flow of natural gas ; through the apparatus. The filter tank may be joined to the gas pipeline by one of a number of means, but, in the embodiment illustrated, is joined in parallel to the gas pipeline by way of inlet pipe 2 and outlet pipe 3. In this manner, gas flowing through the pipeline may pass in suc-~ cession from the pipeline, through the inlet pipe, the :` .
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6~L
filter tank, the outlet pipe and back into the pipeline dol~nstream from the inlet pipe.
A porous filter bed ~ is provided within the filter tank and positioned such that the gas must flow from the inlet pipe through the filter bed (therein being filtered~ and into the outlet pipe. The filter bed is composed of particles of material substantially greater than one inch in diameter that do not or tend not to disintegrate or deteriorate when subject to liquid or gas under pressure, preferably particles of a material selected from the group consisting of gravel, glass and steel.
A series of baffles are arranged within the filter tank so that the gas flow through the filter tank is deflected. In the embodiment illustrated, however, non-permeable baffle 5, illustrated in Figure 3, is secured to the inner wall of the filter tank near the inlet pipe. The gas flow from the inlet pipe is directed by means of a filter tank inner inlet pipe 6 onto the non-permeable baffle such that the gas flow is diverted into the filter bed. Permeable baffles 7 and 8, illustrated in Figures and 5 respectively~ are positioned within the filter tank near the inlet end such that the gas flow passes through the baffle perforations 9.
In the embodiment illustra~ed, the baffle and pipe arrangement within the inlet end of the filter tank is the converse of that within the outlet end of the filter tank. The apparatus of the invention is thereby fully reversible in that either the inlet pipe or the outlet pipe may serve as the gas supply to the apparatus.
3~2~i7~
A drainage pipe 10 is joined to the filter tank such that it connects the`filter tank and a holding tank 11.
The holding tank may be secured to the filter tank in any suitable manner so long as the ~ilter impurities collected in the filter tank may pass due to gravity from the filter tank through the drainage pipe and into the holding tank.
In the embodiment illustrated, the holding tank is positioned directly below the filter tank and secured to the filter tank by support members 12 and 13.
In the embodiment illustrated, a bypass pipe 14 connecting the inlet pipe and the outlet pipe, a blow out pipe 15 connecting the holding tank with the atmosphere, and a filler pipe 16 connecting the filter tank with the atmosphere, are also provided. A lifting lug 17 is fixed to the filter tank. All pipe junctions are secured so that the gas does not leak from the apparatus. Valves for selectively obstructing the gas flow are provided on all pipes. A blowout over pressure safety valve 18 is also optionally attached to the bypass line. This over pressure safety valve may, in a further em~odiment, be attached to the main gas pipeline.
A number of preventative measures may be taken to prevent the corrosion of the device, such as the installation on the apparatus of a zinc anode, prime coating of the apparatus or the wrapping of the apparatus with dinsul tape.
Gas flowing from the natural gas pipeline may be ; diverted from the pipeline through the inlet pipe and into the filter tank by way of the`filter tank inner inlet pipe.
The gas flow is then inhibited and directed by the non- -_g_ j7~
perrrleahle baffle through the filter bed. The gas then passes through the permeable baffles thereby further inhibiting gas flow. Impurities are filtered from the gas by way of the filter bed and baffles. The impurities then pass due to gravity through the drainage pipe and into the holding tank.
The reciprocal baffl~s within the outlet end of the filter tank also inhibit gas flow and assist in the filtering process. The filtered gas then passes into the filter tank inner outlet pipe 19, through the outlet pipe and then returns to the pipeline. During the filtering operation bypass pipe valve 20, filler pipe valve 21, and blowout pipe valve 22 remain closed such that the gas flow through those pipes is prec].uded. Drainage pipe valve 23, inlet pipe valve 24 and outlet pipe valve 25 are open so as to permit the passage of gas and i.mpurities.
Irnpurities collected in the holding tank may be removed therefrom by opening the blowout pipe valve. The gas pressure in the apparatus thereby forces the collected impurities through the blowout pipe and into the atmosphere 2Q or a suitable container.
The filter and holding tanks may be cleansed by diverting the gas flow through the bypass pipe with the aid of ~he inlet, outlet and bypass pipe valves. Alcohol, water or some other suitable cleansinc3 solution may then be introduced into the tanks by way of the filler pipe. The cleaning solution and any accumulated impurities in the apparatus may be re~oved from the apparatus by closing the filler pipe valve, opening the blowout pipe valve and allowing
A drainage pipe 10 is joined to the filter tank such that it connects the`filter tank and a holding tank 11.
The holding tank may be secured to the filter tank in any suitable manner so long as the ~ilter impurities collected in the filter tank may pass due to gravity from the filter tank through the drainage pipe and into the holding tank.
In the embodiment illustrated, the holding tank is positioned directly below the filter tank and secured to the filter tank by support members 12 and 13.
In the embodiment illustrated, a bypass pipe 14 connecting the inlet pipe and the outlet pipe, a blow out pipe 15 connecting the holding tank with the atmosphere, and a filler pipe 16 connecting the filter tank with the atmosphere, are also provided. A lifting lug 17 is fixed to the filter tank. All pipe junctions are secured so that the gas does not leak from the apparatus. Valves for selectively obstructing the gas flow are provided on all pipes. A blowout over pressure safety valve 18 is also optionally attached to the bypass line. This over pressure safety valve may, in a further em~odiment, be attached to the main gas pipeline.
A number of preventative measures may be taken to prevent the corrosion of the device, such as the installation on the apparatus of a zinc anode, prime coating of the apparatus or the wrapping of the apparatus with dinsul tape.
Gas flowing from the natural gas pipeline may be ; diverted from the pipeline through the inlet pipe and into the filter tank by way of the`filter tank inner inlet pipe.
The gas flow is then inhibited and directed by the non- -_g_ j7~
perrrleahle baffle through the filter bed. The gas then passes through the permeable baffles thereby further inhibiting gas flow. Impurities are filtered from the gas by way of the filter bed and baffles. The impurities then pass due to gravity through the drainage pipe and into the holding tank.
The reciprocal baffl~s within the outlet end of the filter tank also inhibit gas flow and assist in the filtering process. The filtered gas then passes into the filter tank inner outlet pipe 19, through the outlet pipe and then returns to the pipeline. During the filtering operation bypass pipe valve 20, filler pipe valve 21, and blowout pipe valve 22 remain closed such that the gas flow through those pipes is prec].uded. Drainage pipe valve 23, inlet pipe valve 24 and outlet pipe valve 25 are open so as to permit the passage of gas and i.mpurities.
Irnpurities collected in the holding tank may be removed therefrom by opening the blowout pipe valve. The gas pressure in the apparatus thereby forces the collected impurities through the blowout pipe and into the atmosphere 2Q or a suitable container.
The filter and holding tanks may be cleansed by diverting the gas flow through the bypass pipe with the aid of ~he inlet, outlet and bypass pipe valves. Alcohol, water or some other suitable cleansinc3 solution may then be introduced into the tanks by way of the filler pipe. The cleaning solution and any accumulated impurities in the apparatus may be re~oved from the apparatus by closing the filler pipe valve, opening the blowout pipe valve and allowing
4~671 a stream of gas under pressure to enter the apparatus. Thus, gas passes through the inlet pipe and into the apparatus thereby forcing the collected cleansing solution and impurities into the atmosphere by way of the blow out pipe.
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Claims (23)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A gas filtering apparatus for the removal from gas of suspended impurities selected from the group consisting of moisture, alcohol and solid particulate impurities comprising a filter tank having an inlet and an outlet for gas flow through the filter tank from the inlet to the outlet, baffles within the filter tank at least a majority of which the gas must flow through and positioned such that the baffles deflect the gas flow, a porous filter bed within the filter tank positioned such that the gas must flow through the filter bed, and, means for collecting the filtered impurities.
2. An apparatus as defined in claim 1 wherein the suspended impurities comprises a member selected from the group consisting of sand, wax and dirt particles.
3, An apparatus as defined in claim 1 wherein the filter bed is substantially comprised of particles of material over one inch in diameter.
4. An apparatus as defined in claim 1 wherein the filter bed is composed of particles of material that are resistant to deterioration or disintegration when subject to liquid or gas under pressure.
5. An apparatus as defined in claim 4 wherein the filter material is a member selected from the group consisting of gravel, glass and steel.
6. An apparatus as defined in claim 1 wherein the means for collecting the filtered impurities comprises, a holding tank having an inlet and an outlet, a drainage pipe connecting the filter tank to the holding tank inlet such that the filtered impurities collected in the filter tank may pass due to gravity from the filter tank through the drainage pipe and into the holding tank, and, means for selectively obstructing the holding tank outlet.
7. An apparatus as defined in claim 6 wherein the means for collecting the filtered impurities further comprises a blowout pipe connecting the holding tank outlet to the atmosphere.
8. An apparatus as defined in claim 6 wherein the means for selectively obstructing the holding tank outlet comprises a valve.
9. An apparatus as defined in claim 7 wherein the means for selectively obstructing the holding tank outlet comprises a valve fixed to the blowout pipe.
10. An apparatus as defined in claim 1 wherein the majority of the baffles are perforated.
11. An apparatus as defined in claim 10 wherein the baffles have per-forations of one-half inch in diameter.
12. An apparatus as defined in claim 1 further comprising means for the gas flow to selectively bypass the apparatus.
13. An apparatus as defined in claim 12 wherein the means for selectively bypassing the apparatus comprises, an inlet pipe fixed to the filter tank inlet permitting gas flow through the inlet pipe and into the filter tank, an outlet pipe fixed to the filter tank outlet permitting gas flow from the filter tank and into the outlet pipe, a bypass pipe permitting gas flow from the inlet pipe to the outlet pipe, and, means for selectively obstructing the inlet, outlet and bypass pipes.
14. An apparatus as defined in claim 13 wherein the means for selectively obstructing the inlet, outlet and bypass pipes comprises, a bypass valve fixed to the bypass pipe, an inline inlet valve fixed to the inlet pipe between the inlet pipe - bypass pipe junction and the filter tank inlet, and an outlet valve fixed to the outlet pipe between the outlet pipe - bypass junction and the filter tank outlet.
15. An apparatus as defined in claim 1 further comprising wash out means for cleaning the filter bed.
16. An apparatus as defined in claim 15 wherein the wash out means comprises a wash out inlet on the filter tank and means for selectively obstructing the wash out inlet.
17. An apparatus as defined in claim 16 wherein the wash out means further comprises a wash out outlet on the filter tank and means for selectively obstructing the wash out outlet.
18. An apparatus as defined in claim 16 or 17 wherein the obstruction means comprises a valve.
19. An apparatus as defined in claim 16 wherein a filler line pipe connecting the filter tank with the atmosphere is fixed to the wash out inlet.
20. An apparatus as defined in claim 19 wherein the obstruction means comprises an in line valve on the filler line pipe.
21. An apparatus as defined in claim 1 further comprising over pressure safety means.
22. An apparatus as defined in claim 21 wherein the over pressure safety means comprises an over pressure safety valve.
23. An apparatus as defined in claim 1 further comprising a zinc anode attached to any location on the device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA359,596A CA1125671A (en) | 1980-09-05 | 1980-09-05 | Natural gas filtering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA359,596A CA1125671A (en) | 1980-09-05 | 1980-09-05 | Natural gas filtering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1125671A true CA1125671A (en) | 1982-06-15 |
Family
ID=4117807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA359,596A Expired CA1125671A (en) | 1980-09-05 | 1980-09-05 | Natural gas filtering device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1125671A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5512088A (en) * | 1994-06-23 | 1996-04-30 | Interglobe Gas Technology, Inc. | Separator |
| WO1997030776A1 (en) * | 1996-02-21 | 1997-08-28 | Longo R James | Air dryer with gravel bed filter |
| CN111528685A (en) * | 2020-05-29 | 2020-08-14 | 广东美的厨房电器制造有限公司 | Drainage assembly and cooking device |
| CN112275032A (en) * | 2019-07-24 | 2021-01-29 | 中国石油天然气股份有限公司 | Horizontal filtering separator of gas transmission field |
-
1980
- 1980-09-05 CA CA359,596A patent/CA1125671A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5512088A (en) * | 1994-06-23 | 1996-04-30 | Interglobe Gas Technology, Inc. | Separator |
| WO1997030776A1 (en) * | 1996-02-21 | 1997-08-28 | Longo R James | Air dryer with gravel bed filter |
| CN112275032A (en) * | 2019-07-24 | 2021-01-29 | 中国石油天然气股份有限公司 | Horizontal filtering separator of gas transmission field |
| CN112275032B (en) * | 2019-07-24 | 2022-06-03 | 中国石油天然气股份有限公司 | Horizontal filtering separator of gas transmission field |
| CN111528685A (en) * | 2020-05-29 | 2020-08-14 | 广东美的厨房电器制造有限公司 | Drainage assembly and cooking device |
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