Method and system for process gas entrainment and mixing in a kiln system
AssigneeHolcim Ltd.
InventorThomas Lowes
Life of this patent
Estimating the term…
Abstract
A method and system for mixing process gas flow by adding or injecting suitably-directed high momentum turbulent gas into dust-laden stratified process gas flow at approximately 850 to 1400° C. to entrain the process gas flow such that stratification is reduced and mixing of both gases and suspended solids is improved. The jet entrainment of the process gas flow by appropriate injection of gas serves to enhance the contact of reacting materials, such as residual fuel and available oxygen, and further serves to improve the completion of reactions, such as combustion of the fuel and the transfer of heat to the raw material/kiln feed.
Claims61
A system for mixing a process gas flow that is flowing through a housing (92) of a kiln system (20), said system comprising:
- at least one injector (84,86) provided to said housing (92);
- a gas supply system (102) connected to said at least one injector (84,86) for supplying injection gas to said injector (84,86) at a predetermined pressure;
- and
- wherein said injector (84,86) and said predetermined pressure are arranged and selected to inject said injection gas into the housing (92) at sufficiently high momentum to produce a jet having appropriate turbulent flow characteristics such that the process gas flow is entrained by said injected gas;
- and
- wherein said injector (84,86) is provided with swirling means for providing axial swirl to said injected gas.
A method of mixing a process gas flow of a kiln system comprising:
- providing a source of injection gas at high pressure;
- and
- injecting said injection gas into said process gas flow via at least one injector at sufficiently high momentum to produce a jet having appropriate turbulent flow characteristics such that the process gas flow is entrained by the injected gas;
- further comprising imparting swirl to said injected gas as it enters a housing of the kiln system (20).
A method of mixing a process gas flow in a housing of a kiln system comprising:
- providing a source of injection gas at high pressure;
- and
- injecting said injection gas into said housing via at least one injector such that said injection gas impinges tangentially on a circle centered on an axis of said process gas flow and covering at least approximately 5 to 15 percent of a cross sectional area of said process gas flow.
Dependencies are inferred from the claim text.