Method and apparatus for feeding a chemical into a liquid flow
AssigneeWetend Technologies Oy
InventorJouni Matula
Life of this patent
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Abstract
A method of and apparatus for feeding a chemical into a liquid flow are especially suited for use with a headbox of a paper machine, particularly for feeding a retention aid into a fiber suspension flow going to the headbox so that in a mixing apparatus feed liquid is added into the retention chemical solution, prior to introducing the solution into the fiber suspension flow guided to the paper machine. The feed liquid is preferably a circulation water from the paper mill, or another non-clean liquid from a paper mill.
Claims10
A method of introducing a liquid chemical into a process liquid flow which is flowing in a flow duct comprising:
- (a) providing a wall of said flow duct with a mixing apparatus,
- (b) introducing a liquid chemical into a first conduit of said mixing apparatus,
- (c) introducing a feeding liquid into a second conduit of said mixing apparatus,
- (d) substantially simultaneously supplying said liquid chemical and said feeding liquid from said first and second conduits into said process liquid flow at least via two flow paths disposed one inside the other and separated from each other so that the liquid chemical and the feeding liquid are injected substantially transverse to the process liquid flow, and that the liquid chemical is forced throughout the whole process liquid flow by means of the feeding liquid.
A method of introducing a liquid chemical into a process liquid flow which is flowing in a flow duct comprising:
- (a) providing a wall of said flow duct with a mixing apparatus,
- (b) feeding said liquid chemical tangentially into a first conduit of said mixing apparatus,
- (c) introducing a feeding liquid into a second conduit of said mixing apparatus,
- (d) substantially simultaneously supplying said liquid chemical and said feeding liquid from said first and second conduits into said process liquid flow so that the liquid chemical and the feeding liquid are injected substantially transverse to the process liquid flow, and that the liquid chemical is forced throughout the whole process liquid flow by means of the feeding liquid.
A method of introducing a liquid chemical into a process liquid flow which is flowing in a flow duct comprising:
- (a) providing a wall of said flow duct with a mixing apparatus,
- (b) introducing a liquid chemical into a first conduit of said mixing apparatus,
- (c) introducing a feeding liquid into a second conduit of said mixing apparatus,
- (d) substantially simultaneously feeding the liquid chemical and the feeding liquid from said first and second conduits into the process liquid flow so that the liquid chemical and the feeding liquid are injected substantially transverse and at least partly in the form of a helical jet to the process liquid flow, and that the liquid chemical is forced throughout the whole process liquid flow by means of the feeding liquid.
Dependencies are inferred from the claim text.