GB1580634A - In tank filtration system - Google Patents

In tank filtration system Download PDF

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Publication number
GB1580634A
GB1580634A GB3611777A GB3611777A GB1580634A GB 1580634 A GB1580634 A GB 1580634A GB 3611777 A GB3611777 A GB 3611777A GB 3611777 A GB3611777 A GB 3611777A GB 1580634 A GB1580634 A GB 1580634A
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GB
United Kingdom
Prior art keywords
filter
storage tank
blocks
bulk storage
modules
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
Application number
GB3611777A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Halliburton Co
Original Assignee
Halliburton Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Halliburton Co filed Critical Halliburton Co
Priority to GB3611777A priority Critical patent/GB1580634A/en
Priority to DE19782835182 priority patent/DE2835182A1/en
Priority to NL7808524A priority patent/NL7808524A/en
Priority to DK381278A priority patent/DK381278A/en
Priority to CA310,245A priority patent/CA1124657A/en
Priority to BE2057235A priority patent/BE870018A/en
Priority to NO782943A priority patent/NO782943L/en
Priority to SE7809130A priority patent/SE7809130L/en
Publication of GB1580634A publication Critical patent/GB1580634A/en
Expired legal-status Critical Current

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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
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B01D46/12—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces in multiple arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/60—Devices for separating the materials from propellant gas

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Description

(54) IN TANK FILTRATION SYSTEM (71) We, HALLIBURTON COM PANY, a corporation organized under the laws of the State of Delaware, United States of America, of 1015 Bois D'Arc, P.O. Box 1431, Duncan Oklahoma 73533 United States of America, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed to be particularly described in and by the following statement: The present invention relates to filters and apparatus comprising a filter for pneumatic conveying operations of particulate material carried in air.
The invention, whose scope is defined in the claims, includes a filter module comprising a carrier frame having a plurality of side members interconnecting two end plates, each end plate having a tubular member mounted thereon, and a plurality of filter blocks secured to the side members and sealed together, said filter blocks comprising a kiln fired mixture of alumina and a ceramic material.
The invention also includes apparatus comprising a filter and a storage tank having an inlet line and a vent line, for pneumatic conveying operations of particulate material carried in air, the filter comprising at least one filter module, as defined in the above paragraph, one tubular member thereof being connected to the vent line while the other tubular member is closed by a cap, the filter being supported within said storage tank.
In order that the invention may be well understood some embodiments thereof will now be described, by way of example only, with reference to the accompanying drawings in which: Figure 1 is a cross-sectional view of a typical bulk storage tank with a filter installed therein; Figure 2 is a cross-sectional view of a typical bulk storage tank with a filter installed therein and having a modified tank inlet line; Figure 3 is a top view of the bulk storage tank shown in Figure 2 with the top of the tank removed to show the filter; Figure 4 is a side view of the filter block carrier frame for a filter module; Figure 5 is an end view of the filter block carrier frame for a filter module; Figure 6 is a side view of a filter module; Figure 7 is an end view of a filter module; Figure 8 is a cross-sectional view of a bulk storage tank with a filter installed therein which is supported by braces from the tank inlet line vent line; Figure 9 is a cross-sectional view of a bulk storage tank having a modified inlet line and having the filter supported by braces from the tank inlet and vent line; Figure 10 is a side view of a filter module having a modified filter block attachment means; and Figure 11 is an end view of a filter module having a modified filter block attachment means.
Shown in Figure 1 is a typical newly constructed bulk storage tank 1 having a top 2, an inlet line 3 which has a downwardly directed exit 4, and a vent line 9. For clarity the tank discharge line is not shown. Installed within the tank 1 is a filter comprising a plurality of filter modules 5 which are connected to each other in series and to the vent line 9 by suitable type of coupling member 6. The coupling members 6 may be threaded unions, welded sections, etc. A cap 7 is used to close the outlet of the last filter module 5.
Also shown in Figure 1, installed in the vent line 9 exterior to the bulk tank lisa valve 10, and a high pressure air inlet line 11 having a valve 12 is connected to the vent line. Alternately, the valve 10 and line 11 and valve 12 may be provided at any convenient point along the vent line 9 either internally or externally of the tank 1.
Any suitable type of means 8 may be used for supporting the filter modules 5 within the bulk storage tank 1. A simple metal support which is welded to the tank top 2 and to the coupling 6 is found to be a convenient means of supporting the filter modules 5 within the tank 1, although a support fastened to the tank wall, vent line or inlet line can be used.
As shown in Figure 2, the newly constructed bulk storage tank 1 has a modified inlet line 3. The inlet line 3 has the opening 4' directed such that the air and particles exiting from the opening 4' directly impinge on the filter modules 5. The importance of having the air and particles exiting the opening 4' directly impinging on the filter modules 5 will be explained in the description of the operation of the filter modules hereinafter.
In Figure 3, the hatch opening 13 (shown in phantom) is the normal means of entry for inspection and maintenance of the bulk storage tank 1. In a bulk storage tank 1 any filter module 5 installed therein must be capable of being inserted through the hatch opening 13 and must be easy to handle during installation and maintenance. For typical bulk storage tank structures, the hatch opening is approximately twenty inches in inside diameter.
In Figure 4 and Figure 5, the filter block carrier frame for the filter module 5 is shown.
The carrier frame comprises two end plates 15 having tubular members 16 mounted thereon and side members 14 spacing the end plates 15 apart. The carrier frame can be formed from any suitable material, although metal is preferred. The tubular members 16, the end plates 15 and side members 14 can be assembled together and secured in their relative positions using any suitable fastening method, although welding is preferred.
In Figure 6 and Figure 7, the complete filter module 5 is shown having the filter blocks 17 installed on the carrier frame of Figures 4 and 5. Although the filter blocks 17 can be formed of any suitable material, grade number 10,12" x 12" x 1", Aloxite (Registered Trade Mark) blocks manufactured by the Carborundum Corporation of Niagara Falls, New York, are the preferred filter media. The Aloxite (R.T.M.) blocks are a kiln fired mixture of alumina and a ceramic material.
The filter blocks 17 are preferably secured to the carrier frame and sealed together by means of any suitable adhesive epoxy resin material, such as Epon 828 manufactured and sold by the Shell Oil Company of Houston, Texas. The Epon 828 adhesive has an epoxy equivalent weight of 185-192, a viscosity at 25"C of 10,000-16,000 centipoises and is a liquid diglycidyl ether disphenol -A.
Although it is preferred that the filter blocks 17 be adhesively bonded to the carrier frame and to each other where they abut, any other suitable fastening means could be used to secure the filter blocks 17 to the carrier frame, such as bolts, circumferential bands, etc.
Although shown in Figure 6 and Figure 7 as being a four sided filter module assembly, the filter module may be of any convenient geometric shape which is capable of being inserted through the tank hatch 13.
Shown in Figure 8 is a modified mounting arrangement for the filter modules 5 when installed in an existing bulk storage tank 1.
Since the bulk storage tanks are certified as being manufactured under and in compliance with various safety codes, once the bulk storage tanks are manufactured, installed and in service, no changes or additions can be made to the tank structure without destroying its certification. Therefore, a convenient manner to support the filter modules 5 in an existing bulk storage tank 1 without affecting its certification is by attaching supporting members 8' to the inlet line 3 and vent line 9. The supporting members 8' may be attached to the inlet line 3, vent line 9 and couplings 6 by any suitable means, such as welding.
Shown in Figure 9 is an existing bulk storage tank 1 having supporting members 8' and a modified exit 4' on inlet line 3 so that the air and particles exiting inlet line 3 directly impinge upon the filter modules 5.
A modified filter block 17 mounting arrangement is shown in Figure 10 and Figure 11. The filter blocks 17 are fastened to the carrier frame by means of threaded members 23, nuts 24 and washers 25. The filter blocks 17 are sealed together where they abut with any suitable sealant material to prevent leakage, such as Epon 828.
In a typical pneumatic conveying operation, cement is conveyed into the bulk storage tank 1 through inlet line 3. As shown in Figure 1, the air and cement particles exit inlet line 3 through downwardly directed exit 4. While most of the cement particles fall to the bottom of the bulk storage tank 1 at this time, the air, which causes turbulence in the bulk storage tank 1, has a tendency to retain a portion of the cement particles in suspension. As shown in Figure 1, before the air can be vented from the bulk storage tank 1 through vent line 9, it must pass through the filter blocks 17 on the filter modules 5 which, in turn, filter out almost all the cement particles suspended in the air.
However, in a bulk storage tank 1 having an inlet line 3 with a downwardly directed exit 4, it has been found that the filter modules 5 have a tendency to become plugged with or have caked on the exterior of the modules the cement particles being conveyed, and must be periodically cleaned. The plugging or caking of the filter modules by the cement particles being conveyed can easily be seen by observing the pressure within the bulk storage tank 1. Typically, for the pneumatic conveying of cement at a rate of approximately 400 cubic feet of air per minute with approximately 20 square feet of filter area being exposed by the filter modules 5 using Aloxite blocks as the filter media, when the filter blocks are clean, the normal pressure within the bulk storage tank 1 will vary between nearly atmospheric pressure to approximately one pound per square inch of pressure above atmospheric pressure.
When the bulk storage tank 1 pressure reaches approximately eight pounds per square inch above atmospheric pressure, the filter blocks 17 should normally be cleaned.
To clean the filter modules while the conveying process is in progress, the valve 10 in vent line 9 is closed and the valve 12 in the high pressure air inlet line 11 is opened. By opening valve 12, air at approximately 40 pounds per square inch of pressure above atmospheric pressure is supplied to the filter modules 5, thereby back-flushing most of the cement particles which are plugging or caked on the exterior of the filter blocks into the bulk storage tank 1. To prevent the possibility of damage to the filter modules 5 or the bulk storage tank 1, the high pressure air used to back-flush the filter blocks 17 is only supplied to the filter modules 5 for approximately five seconds during the cleaning process.
After the valve 12 is closed, the valve 10 in the vent line 9 is re-opened, thereby venting the interior of the bulk storage tank 1 to atmospheric pressure. At this time the pressure within the bulk storage tank 1 returns to approximately atmospheric or one pound per square inch above atmospheric.
If the filter blocks 17 again become plugged during the conveying process, the backflushing of the filter blocks 17 is repeated as often as necessary. Any suitable control system may be used to control the back-flushing of the filter blocks 17, such as either a manual system or an automatic system.
As shown in Figure 2, it has been found that if the inlet line 3 is modified to direct the exit 4' so that the air and cement particles being conveyed directly impinge upon a plurality of filter modules 5 during the conveying process, the filter blocks 17 do not require cleaning by periodic back-flushing.
For example, when pneumatically conveying cement at a rate of approximately 400 cubic feet of air per minute with approximately 20 square feet of filter area being exposed by the filter modules 5 using Aloxite (R.T.M.) blocks as the filter media, it was found that the bulk storage tank 1 pressure ranged from one to two pounds per square inch above atmospheric pressure during the conveying process with no cleaning by back-flushing of the filter blocks being required to maintain the bulk storage tank 1 pressure within this range. As further illustrated in Figure 2, a high pressure air line 11 has been included along with a valve 12 to permit back-flushing of the filter blocks 17, if it should be required. This is merely considered to be a safety feature in this particular configuration.
Additionally, it has been found that when conveying cement using the Aloxite (R.T.M.) blocks as the filter media, no appreciable cement loss through the bulk storage tank vent line 9 occurs either during the conveying process or the filter cleaning process.
The filter modules 5 offer the advantages of being easily inserted through the hatch opening 13 in a bulk storage tank 1, of being individually removable in case of damage to the filter blocks 17 of being installed in any desired number to facilitate any pneumatic conveying rate. It has also been found that by installing the filter modules within the bulk storage tank 1, the bulk tank can be more completely filled than a tank which is merely vented to an external filter or is vented directly to the atmosphere.
It will be appreciated that the described filter is entirely within the bulk storage tank, and requires minimum maintenance and is easily installed, either during construction of the storage tank, or into already existing storage tanks.
Whilst the illustrated filter comprises a plurality of filter modules it is to be understood that a filter could comprise just one filter module.
WHAT WE CLAIM IS: 1. A filter module comprising a carrier frame having a plurality of side members interconnecting two end plates, each end plate having a tubular member mounted thereon, and a plurality of filter blocks secured to the side members and sealed together, said filter blocks comprising a kiln fired mixture of alumina and a ceramic material.
2. A filter module as claimed in claim 1 wherein the filter blocks are secured to the side members and sealed together by means of an epoxy resin.
3. A filter module as claimed in claim 1, wherein the filter blocks are secured to the side members by means of threaded fasteners and the filter blocks are sealed together by means of an epoxy resin.
4. Apparatus comprising a filter and a storage tank having an inlet line and a vent line, for pneumatic conveying operations of particulate material carried in air, the filter comprising at least one filter module as claimed in any one of the preceding claims, one tubular member thereof being connected to the vent line while the other tubular member is closed by a cap, the filter being supported within said storage tank.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (12)

**WARNING** start of CLMS field may overlap end of DESC **. the bulk storage tank 1. Typically, for the pneumatic conveying of cement at a rate of approximately 400 cubic feet of air per minute with approximately 20 square feet of filter area being exposed by the filter modules 5 using Aloxite blocks as the filter media, when the filter blocks are clean, the normal pressure within the bulk storage tank 1 will vary between nearly atmospheric pressure to approximately one pound per square inch of pressure above atmospheric pressure. When the bulk storage tank 1 pressure reaches approximately eight pounds per square inch above atmospheric pressure, the filter blocks 17 should normally be cleaned. To clean the filter modules while the conveying process is in progress, the valve 10 in vent line 9 is closed and the valve 12 in the high pressure air inlet line 11 is opened. By opening valve 12, air at approximately 40 pounds per square inch of pressure above atmospheric pressure is supplied to the filter modules 5, thereby back-flushing most of the cement particles which are plugging or caked on the exterior of the filter blocks into the bulk storage tank 1. To prevent the possibility of damage to the filter modules 5 or the bulk storage tank 1, the high pressure air used to back-flush the filter blocks 17 is only supplied to the filter modules 5 for approximately five seconds during the cleaning process. After the valve 12 is closed, the valve 10 in the vent line 9 is re-opened, thereby venting the interior of the bulk storage tank 1 to atmospheric pressure. At this time the pressure within the bulk storage tank 1 returns to approximately atmospheric or one pound per square inch above atmospheric. If the filter blocks 17 again become plugged during the conveying process, the backflushing of the filter blocks 17 is repeated as often as necessary. Any suitable control system may be used to control the back-flushing of the filter blocks 17, such as either a manual system or an automatic system. As shown in Figure 2, it has been found that if the inlet line 3 is modified to direct the exit 4' so that the air and cement particles being conveyed directly impinge upon a plurality of filter modules 5 during the conveying process, the filter blocks 17 do not require cleaning by periodic back-flushing. For example, when pneumatically conveying cement at a rate of approximately 400 cubic feet of air per minute with approximately 20 square feet of filter area being exposed by the filter modules 5 using Aloxite (R.T.M.) blocks as the filter media, it was found that the bulk storage tank 1 pressure ranged from one to two pounds per square inch above atmospheric pressure during the conveying process with no cleaning by back-flushing of the filter blocks being required to maintain the bulk storage tank 1 pressure within this range. As further illustrated in Figure 2, a high pressure air line 11 has been included along with a valve 12 to permit back-flushing of the filter blocks 17, if it should be required. This is merely considered to be a safety feature in this particular configuration. Additionally, it has been found that when conveying cement using the Aloxite (R.T.M.) blocks as the filter media, no appreciable cement loss through the bulk storage tank vent line 9 occurs either during the conveying process or the filter cleaning process. The filter modules 5 offer the advantages of being easily inserted through the hatch opening 13 in a bulk storage tank 1, of being individually removable in case of damage to the filter blocks 17 of being installed in any desired number to facilitate any pneumatic conveying rate. It has also been found that by installing the filter modules within the bulk storage tank 1, the bulk tank can be more completely filled than a tank which is merely vented to an external filter or is vented directly to the atmosphere. It will be appreciated that the described filter is entirely within the bulk storage tank, and requires minimum maintenance and is easily installed, either during construction of the storage tank, or into already existing storage tanks. Whilst the illustrated filter comprises a plurality of filter modules it is to be understood that a filter could comprise just one filter module. WHAT WE CLAIM IS:
1. A filter module comprising a carrier frame having a plurality of side members interconnecting two end plates, each end plate having a tubular member mounted thereon, and a plurality of filter blocks secured to the side members and sealed together, said filter blocks comprising a kiln fired mixture of alumina and a ceramic material.
2. A filter module as claimed in claim 1 wherein the filter blocks are secured to the side members and sealed together by means of an epoxy resin.
3. A filter module as claimed in claim 1, wherein the filter blocks are secured to the side members by means of threaded fasteners and the filter blocks are sealed together by means of an epoxy resin.
4. Apparatus comprising a filter and a storage tank having an inlet line and a vent line, for pneumatic conveying operations of particulate material carried in air, the filter comprising at least one filter module as claimed in any one of the preceding claims, one tubular member thereof being connected to the vent line while the other tubular member is closed by a cap, the filter being supported within said storage tank.
5. Apparatus as claimed in claim 4,
wherein said filter comprises a plurality of said filter modules connected in series by their tubular members, with the outermost free tubular members being connected to said vent line and closed by said cap respectively.
6. Apparatus as claimed in claim 4 or 5, wherein the filter is supported by the vent line within said storage tank.
7. Apparatus as claimed in claim 4, 5 or 6, wherein the filter is supported by the inlet line within said storage tank.
8. Apparatus as claimed in any one of claims 4 to 7, wherein the inlet line is directed such that the particulate material exiting therefrom, in use, impinges on the filter.
9. Apparatus as claimed in any one of claims 4 to 8, further comprising, a valve located in the vent line, an air line connected to the vent line, and a valve located in the air line.
10. Apparatus as claimed in claim 9, wherein the airline is connected to the vent line externally of the storage tank.
11. A filter module substantially as herein described with reference to the accompanying drawings.
12. Apparatus substantially as herein described with reference to the accompanying drawings.
GB3611777A 1977-08-30 1977-08-30 In tank filtration system Expired GB1580634A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
GB3611777A GB1580634A (en) 1977-08-30 1977-08-30 In tank filtration system
DE19782835182 DE2835182A1 (en) 1977-08-30 1978-08-11 Reservoir for bulk granular material - is filled pneumatically with air discharged through filter whose cleaner is actuated in response to reservoir pressure
NL7808524A NL7808524A (en) 1977-08-30 1978-08-17 FILTER AND PROCEDURES FOR ITS APPLICATION.
DK381278A DK381278A (en) 1977-08-30 1978-08-29 FILTRATION SYSTEMS FOR INSTALLATION IN STORAGE TANKS
CA310,245A CA1124657A (en) 1977-08-30 1978-08-29 In tank filtration system
BE2057235A BE870018A (en) 1977-08-30 1978-08-29 TANK FOR BULK GOODS
NO782943A NO782943L (en) 1977-08-30 1978-08-29 FILTER SYSTEM INSIDE A TANK.
SE7809130A SE7809130L (en) 1977-08-30 1978-08-30 FILTERING SYSTEM IN CONTAINER

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3611777A GB1580634A (en) 1977-08-30 1977-08-30 In tank filtration system

Publications (1)

Publication Number Publication Date
GB1580634A true GB1580634A (en) 1980-12-03

Family

ID=10385140

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3611777A Expired GB1580634A (en) 1977-08-30 1977-08-30 In tank filtration system

Country Status (2)

Country Link
BE (1) BE870018A (en)
GB (1) GB1580634A (en)

Also Published As

Publication number Publication date
BE870018A (en) 1978-12-18

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PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee