Gas treatment system and method

Abstract

An embodiment gas treatment system (10) includes a gas treatment chamber (12). The gas treatment chamber (12) is separated into (i) a chemical agent chamber (14) adapted to store a liquid chemical agent and (ii) a gas/chemical agent mixing chamber (18) in fluid communication with the chemical agent chamber (14). The system (10) includes an atomising assembly (20) operatively associated with the gas/chemical agent mixing chamber (18) and a pressurised gas supply assembly (22) in operative fluid communication with the atomising assembly (20). The system also includes a chemical agent supply assembly (24) to provide fluid communication between the chemical agent chamber (14) and the atomising assembly (20) wherein the atomising assembly (20) is operatively adapted to atomise liquid chemical agent into a stream of pressurised gas fed from the pressurised gas supply assembly (22) into the gas/chemical mixing agent chamber (18).

Claims

1. A gas treatment system including: a gas treatment chamber, the gas treatment chamber separated into (i) a chemical agent chamber adapted to store a liquid chemical agent, and (ii) a gas/chemical agent mixing chamber in fluid communication with the chemical agent chamber; an atomising assembly operatively associated with the gas/chemical agent mixing chamber; a pressurised gas supply assembly in operative fluid communication with the atomising assembly; and a chemical agent supply assembly to provide fluid communication between the chemical agent chamber and the atomising assembly, wherein the atomising assembly is operatively adapted to atomise liquid chemical agent into a stream of pressurised gas fed from the pressurised gas supply assembly into the gas/chemical mixing agent chamber, wherein the gas treatment chamber comprises a cylinder having a hollow interior, and wherein the cylinder houses a separator adapted to separate the hollow interior into the chemical agent chamber and the gas/chemical agent mixing chamber.

2. A gas treatment system according to claim 1, wherein the gas is air.

3. A gas treatment system according to claim 1, wherein the gas treatment chamber includes a filler assembly through which liquid chemical agent is fed to the chemical agent chamber.

4. A gas treatment system according to claim 3, wherein the gas treatment chamber includes a chamber inlet operatively associated with the atomising assembly, in use pressurised gas from the pressurised gas supply assembly and liquid chemical agent from the chemical agent chamber being fed into the gas/chemical agent mixing chamber.

5. A gas treatment system according to claim 4, wherein the gas treatment chamber includes a chamber outlet operatively associated with the gas/chemical agent mixing chamber and through which a gaseous mixture of gas and chemical agent exits the gas treatment chamber.

6. A gas treatment system according to claim 5, wherein the gas/chemical agent mixing chamber includes a baffle assembly operatively adapted to facilitate evaporation of the chemical agent and to extract airborne chemical agent droplets from the gas/chemical agent mixing chamber.

7. A gas treatment system according to claim 6, wherein the baffle assembly includes strands of chemically inert material.

8. A gas treatment system according to claim 6, wherein the baffle assembly includes a perforated plate.

9. A gas treatment system according to claim 1, wherein the pressurised gas supply assembly, includes a pressurised gas source, a gas regulator and a manifold.

10. A gas treatment system according to claim 1, wherein the chemical agent chamber includes a chemical agent outlet.

11. A gas treatment system according to claim 10, wherein the chemical agent outlet includes 3 pickup points.

12. A spray paint assembly including a spray gun in fluid communication with a gas treatment system according to claim 1.

13. A gas treatment system including: a gas treatment chamber, the gas treatment chamber separated into (i) a chemical agent chamber adapted to store a liquid chemical agent, and (ii) a gas/chemical agent mixing chamber in fluid communication with the chemical agent chamber; an atomising assembly operatively associated with the gas/chemical agent mixing chamber; a pressurised gas supply assembly in operative fluid communication with the atomising assembly; and a chemical agent supply assembly to provide fluid communication between the chemical agent chamber and the atomising assembly, wherein the atomising assembly is operatively adapted to atomise liquid chemical agent into a stream of pressurised gas fed from the pressurised gas supply assembly into the gas/chemical mixing agent chamber, wherein the pressurised gas supply assembly, includes a pressurised gas source, a gas regulator and a manifold, and wherein the manifold is a 3-way manifold.

14. A gas treatment system including: a gas treatment chamber, the gas treatment chamber separated into (i) a chemical agent chamber adapted to store a liquid chemical agent, and (ii) a gas/chemical agent mixing chamber in fluid communication with the chemical agent chamber; an atomising assembly operatively associated with the gas/chemical agent mixing chamber; a pressurised gas supply assembly in operative fluid communication with the atomising assembly; and a chemical agent supply assembly to provide fluid communication between the chemical agent chamber and the atomising assembly, wherein the atomising assembly is operatively adapted to atomise liquid chemical agent into a stream of pressurised gas fed from the pressurised gas supply assembly into the gas/chemical mixing agent chamber, wherein the pressurised gas supply assembly, includes a pressurised gas source, a gas regulator and a manifold, and wherein the atomising assembly includes adjustable sprayers.

15. A gas treatment system according to claim 14, wherein the atomising assembly includes 3 adjustable sprayers.

16. A gas treatment system according to claim 15, wherein the manifold is in fluid communication with the 3 adjustable sprayers with 3 gas conduits of the pressurised gas supply assembly.

17. A gas treatment system according to claim 16, wherein the chemical agent supply assembly includes 3 chemical agent conduits operatively adapted to provide fluid communication between the chemical agent outlet and the 3 adjustable sprayers via the 3 chemical agent conduits.

18. A gas treatment method including the steps of: providing a gas treatment chamber, the gas treatment chamber separated into (i) a chemical agent chamber adapted to store a liquid chemical agent, and (ii) a gas/chemical agent mixing chamber in fluid communication with the chemical agent chamber with the gas treatment chamber including a cylinder having a hollow interior; providing an atomising assembly operatively associated with the gas/chemical agent mixing chamber with the gas treatment chamber cylinder housing a separator adapted to separate the hollow interior into the chemical agent chamber and the gas/chemical agent mixing chamber; providing a pressurised gas supply assembly in operative fluid communication with the atomising assembly; providing a chemical agent supply assembly to provide fluid communication between the chemical agent chamber and the atomising assembly; and atomising liquid chemical agent into a stream of pressurised gas fed from the pressurised gas supply assembly into the gas/chemical mixing agent chamber via the atomising assembly.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Preferred embodiments of the invention will be described hereinafter, by way of examples only, with reference to the accompanying drawings, wherein:

(2) FIG. 1 is a schematic illustration of a first embodiment gas treatment system; and

(3) FIG. 2 is a schematic illustration of a second embodiment gas treatment system.

BRIEF DESCRIPTION OF THE DRAWINGS

(4) FIG. 1 shows a first embodiment gas treatment system, generally indicated with the reference numeral 10, having a gas treatment chamber 12. The gas treatment chamber 12 is separated into (i) a chemical agent chamber 14 adapted to store a liquid chemical agent 16, and (ii) a gas/chemical agent mixing chamber 18 in fluid communication with the chemical agent chamber 14. The gas treatment system 10 further includes an atomising assembly 20, operatively associated with the gas/chemical agent mixing chamber 18, and a pressurised gas supply assembly 22 in operative fluid communication with the atomising assembly 20. The gas treatment system 10 also includes a chemical agent supply assembly 24 to provide fluid communication between the chemical agent chamber 14 and the atomising assembly 20. The atomising assembly 20 is operatively adapted to atomise liquid chemical agent into a stream of pressurised gas, in this embodiment air, fed from the pressurised gas supply assembly 22 into the gas/chemical mixing agent chamber 18.

(5) The embodiment gas treatment chamber 12 comprises a cylinder 26 having a hollow interior 28. The cylinder 26 longitudinally extends about a longitudinal axis 11. In this embodiment the longitudinal axis 11 is operatively horizontally orientated. The cylinder 26 houses a separator 30 adapted to separate the hollow interior 28 into the chemical agent chamber 14 and the gas/chemical agent mixing chamber 18. In this embodiment the separator 30 is provided in the form of a perforated divider panel. As shown, the liquid chemical agent 16 lies at the bottom of the cylinder 26.

(6) The gas treatment chamber 12 includes a filler assembly 32 through which liquid chemical agent can be fed to fill/replenish the chemical agent chamber 14. The gas treatment chamber 12 also includes a chamber inlet 34 operatively associated with the atomising assembly 20. In use pressurised air from the pressurised gas supply assembly 22 and liquid chemical agent from the chemical agent chamber 14 are fed into the gas/chemical agent mixing chamber 18 via the atomising assembly 20. The gas treatment chamber 12 further includes a chamber outlet 36 operatively associated with the gas/chemical agent mixing chamber 18. During use a gaseous mixture of air and chemical agent will exit the gas treatment chamber 12 via the chamber outlet 36. The chamber outlet 36 includes a single outlet opening 38 located towards the operative top of the gas/chemical agent mixing chamber. The effect of this arrangement is that the chemical agent reaches saturation point and exits the gas/chemical agent mixing chamber 18 in a gaseous phase only.

(7) The embodiment gas/chemical agent mixing chamber 18 includes a baffle assembly 40 operatively adapted to facilitate evaporation of the chemical agent and to extract airborne chemical agent droplets from the gas/chemical agent mixing chamber 18. Such extracted chemical agent droplets are fed through the separator 30 back into the chemical agent chamber 14 to undergo another atomising cycle. In this embodiment the baffle assembly 40 includes two baffle sections 42, each baffle section including fine strands of chemically inert material. It will of course be appreciated that the baffle sections 42 can take various forms, for example each baffle section may comprise a non-illustrated perforated plate.

(8) The pressurised gas supply assembly 22 includes a pressurised air source 44 (here a compressor), a regulator 46 and a 3-way manifold 48. The atomising assembly 20, in turn, includes 3 adjustable sprayers 50. The 3-way manifold 48 is in fluid communication with the 3 adjustable sprayers 50 with 3 air conduits 52 of the pressurised gas supply assembly 22.

(9) The chemical agent chamber 14 includes a chemical agent outlet 54 having 3 non-illustrated pickup points in fluid communication with the chemical agent supply assembly 24. In this embodiment the chemical agent supply assembly 24 includes 3 chemical agent conduits 56 for providing fluid communication between the chemical agent outlet 54 and the 3 adjustable sprayers 50 of the atomising assembly 20. In use pressurised air passing through the atomising assembly 20 will cause chemical agent to be drawn from the chemical agent chamber 14 into the atomising assembly to undergo atomisation.

(10) In one particular application the chamber outlet 36 has a non-illustrated hose attached thereto. The hose, in turn, is coupled to a non-illustrated commercially available siphon pot spray gun holding a two-pack polyurethane paint. It would be appreciated that gravity feed or pressure pot delivery systems could also be employed. The chemical agent 16 in this application is a liquid accelerant. When the trigger of the spray gun is opened a gaseous mixture of air and accelerant will atomise the polyurethane and spray it onto a surface/substrate to be coated. The effect of this is that the accelerant is applied at the precise moment the coating is deposited onto the surface/surface. Due to the presence of accelerant in the air, the rate of curing of the polyurethane paint is accelerated without the paint curing prematurely. Also, accelerated curing has been found to reduce the amount of free monomeric isocyanate in the two-pack polyurethane paint. Eliminating or reducing the free monomer content of the polyurethane paint immediately following atomisation renders them less liable to inflict long term chronic effects.

(11) FIG. 2 shows a second embodiment gas treatment system 70. The gas treatment system 70 includes a gas treatment chamber 72. The gas treatment chamber 72 is separated into (i) a chemical agent chamber 74 adapted to store a liquid chemical agent 76, and (ii) a gas/chemical agent mixing chamber 78 in fluid communication with the chemical agent chamber 74. The gas treatment system 70 further includes an atomising assembly 80, operatively associated with the gas/chemical agent mixing chamber 78, and a pressurised gas supply assembly 82 in operative fluid communication with the atomising assembly 80. The gas treatment system 80 also includes a chemical agent supply assembly 84 to provide fluid communication between the chemical agent chamber 74 and the atomising assembly 80. The atomising assembly 80 is operatively adapted to atomise liquid chemical agent into a stream of pressurised gas, in this embodiment air, fed from the pressurised gas supply assembly 82 into the gas/chemical mixing agent chamber 78.

(12) The embodiment gas treatment chamber 72 comprises a cylinder 86 having a hollow interior 88. The cylinder 86 longitudinally extends about a longitudinal axis 71. In this embodiment the longitudinal axis 71 is operatively vertically orientated. The cylinder 86 houses a separator 90 adapted to separate the hollow interior 88 into an inlet section 91 and outlet section 93. In this embodiment the separator 90 is provided in the form of an elongate divider panel. As shown, the liquid chemical agent 76 lies at the bottom of the cylinder 86. The cylinder 86 includes a drain 87 though which chemical agent can be drained from the cylinder 86.

(13) The gas treatment chamber 72 at its top includes a chamber inlet 94 operatively associated with the atomising assembly 80. In use pressurised air from the pressurised gas supply assembly 82 and liquid chemical agent from the chemical agent chamber 74 is fed into the gas/chemical agent mixing chamber 78 via the atomising assembly 80. The gas treatment chamber 72 further includes a chamber outlet 96 at its top operatively associated with the gas/chemical agent mixing chamber 78. During use a gaseous mixture of air and chemical agent will exit the gas treatment chamber 72 via the chamber outlet 96.

(14) The embodiment gas/chemical agent mixing chamber 78 includes a separator assembly 100 operatively adapted to facilitate evaporation of the chemical agent and to extract airborne chemical agent droplets from the gas/chemical agent mixing chamber 78. Such extracted chemical agent droplets will drop under the influence of gravity back to the chemical agent chamber 74 to undergo another atomising cycle. In this embodiment the separator assembly 100 includes a plurality of separator units 102. In this embodiment each separator unit 102 is provided in the form of a perforated plate.

(15) The pressurised gas supply assembly 82 includes a pressurised air source 104 (here a compressor), a regulator 106 and a 3-way manifold 108. The atomising assembly 80, in turn, includes 3 adjustable sprayers 110. The 3-way manifold 108 is in fluid communication with the 3 adjustable sprayers 110 with three air conduits 112 of the pressurised gas supply assembly 82.

(16) The chemical agent chamber 74 includes a chemical agent outlet 114 having three non-illustrated pickup points in fluid communication with the chemical agent supply assembly 84. In this embodiment the chemical agent supply assembly 84 includes three chemical agent conduits 116 for providing fluid communication between the chemical agent outlet 114 and the 3 adjustable sprayers 110 of the atomising assembly 80. In use pressurised air passing through the atomising assembly 80 will cause chemical agent 76 to be drawn from the chemical agent chamber 74 into the atomising assembly to undergo atomisation. In this embodiment pressurised air will enter the chemical agent chamber 74 via the inlet section 91, pass underneath the separator 90, and exit via the outlet section 93 by passing through the separator units 102. Upon exiting the gas treatment chamber 72 air is fed through an accumulator 118 in which any chemical agent which has escaped the gas treatment chamber 72 is captured and prevented from being fed to a downstream non-illustrated spray gun.

(17) Although the invention is described above in relation to preferred embodiments, it will be appreciated by those skilled in the art that it is not limited to those embodiments, but may be embodied in many other forms.

KEY TO REFERENCE NUMERALS

(18) 10 Gas treatment system 11 Longitudinal axis 12 Gas treatment chamber 14 Chemical agent chamber 16 Chemical agent 18 Gas/chemical agent mixing chamber 20 Atomising assembly 22 Pressurised gas supply assembly 24 Chemical agent supply assembly 26 Cylinder 28 Interior 30 Separator 32 Filler assembly 34 Chamber inlet 36 Chamber outlet 38 Outlet opening 40 Baffle assembly 42 Baffle sections 44 Air source 46 Regulator 48 Manifold 50 Sprayers 52 Air conduits 54 Chemical agent outlet 56 Chemical agent conduits 70 Second embodiment gas treatment system 71 Longitudinal axis 72 Gas treatment chamber 74 Chemical agent chamber 76 Chemical agent 78 Gas/chemical agent mixing chamber 80 Atomising assembly 82 Pressurised gas supply assembly 84 Chemical agent supply assembly 86 Cylinder 87 Drain 88 Interior 90 Separator 91 Inlet section 93 Outlet section 94 Chamber inlet 96 Chamber outlet 100 Separator assembly 102 Separator units 104 Pressurised air source 106 Regulator 108 Manifold 110 Adjustable sprayers 112 Air conduits 114 Chemical agent outlet 116 Chemical agent conduits