Pulverized coal flow controller
OwnerRaymond K. Kim, John B. Kittoinventors
Life of this patent
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Abstract
An apparatus and method for supplying a controlled flow of fluid transported solid particles, in particular, pulverized coal by the controlled injection of a fluid, such as a gas like compressed air, into at least one feed pipe. The flow of coal in feed pipes is controlled by selectively reducing or increasing the flow of primary air to achieve a balanced burner operation.
Claims15
An apparatus for controlling the flow of fluid transported solid particles, comprising:
- a vessel for containing a mixture of primary fluid with suspended particles;
- at least one feed pipe connected to said vessel for supplying a flow of said mixture from said vessel;
- means for injecting a fluid under pressure into each feed pipe, said injecting means being situated so that the injected fluid creates a recirculation zone proportional in size to the injection pressure of the fluid in each feed pipe, the size of the recirculation zone proportionally regulating the flow of primary fluid;
- means for measuring the flow in each feed pipe and establishing a signal indicative thereof, said measuring means being positioned downstream from said injection means;
- and
- means for controlling the fluid injection pressure for each feed pipe responsive to the flow signal.
A pulverized coal flow controller for controlling the flow of coal in feed pipes, comprising:
- a pulverizer for containing a mixture of primary fluid with suspended coal particles;
- a plurality of feed pipes connected to said pulverizer for supplying a flow of the mixture to a plurality of burners in a boiler;
- means for injecting a fluid under pressure into at least one of said feed pipes, said injecting means being situated so that the injected fluid creates a recirculation zone proportional in size to the injection pressure of the fluid in the feed pipe, the size of the recirculation zone regulating proportionally the flow of primary fluid;
- means for measuring the flow in the feed pipe and establishing a signal indicative thereof, said measuring means being positioned downstream from said injecting means;
- and
- means for controlling the fluid injection pressure for the feed pipe responsive to the flow signal to regulate the amount of fluid supplied therefrom.
A method of supplying a controlled flow of fluid transported solid particles, comprising the steps of:
- suspending solid particles in a vessel to form a mixture of solid particles and a primary fluid;
- discharging the mixture through at least one feed pipe out of the vessel;
- injecting a fluid under pressure into at least one feed pipe;
- creating with the injected fluid a recirculating zone proportional in size to the injection pressure of the fluid in the feed pipe;
- measuring the flow in the feed pipe downstream from the recirculation zone;
- establishing a signal indicative of the flow;
- and
- controlling the fluid injection pressure for the feed pipe in response to changes in the flow signal.
Dependencies are inferred from the claim text.