Circulation control in dual bed gasifiers
OwnerYong Hua LI, Wei WANG +1inventors
InventorsYong Hua LI, Wei WANG, Alan Paul WATKINSON
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Abstract
A solid circulation monitoring and/or control system for a dual bed gasification apparatus. The monitoring and/or control system comprises a plurality of pressure sensors located at various regions within the dual bed gasification system, for monitoring pressure while the apparatus is operated. Comparison of pressures and pressure differentials between different regions of the gasifier allow monitoring of the status, and optimization of the operation conditions of the apparatus.
Claims19
A solid circulation monitoring system for a dual-bed gasification apparatus, said dual-bed gasification apparatus comprising:
- a gasifier having a bed and a freeboard;
- a combustor having a bottom end and a top end;
- a lower branch conduit connecting the gasifier to the combustor;
- said lower branch conduit configured to allow transfer of heat carrier particles from the gasifier to the combustor;
- an upper branch conduit connecting the combustor to the gasifier;
- said upper branch conduit configured to allow transfer of heat carrier particles from the combustor to the gasifier;
- said upper branch conduit having an upper portion, a middle portion, and a lower portion;
- said monitoring system comprising a plurality of pressure sensors, each measuring a pressure at a location within the dual-bed gasification apparatus while the dual-bed gasification apparatus is in operation.
A method for controlling solids circulation in a dual-bed gasification apparatus, said dual-bed gasification apparatus comprising:
- a gasifier having a bed and a freeboard;
- a combustor having a bottom end and a top end;
- a lower branch conduit connecting the gasifier to the combustor;
- said lower branch conduit configured to allow transfer of heat carrier particles from the gasifier to the combustor;
- said lower branch conduit optionally having a lower branch non-mechanical device permitting control of rate of passage of said heat carrier particles from the gasifier to the combustor;
- an upper branch conduit connecting the combustor to the gasifier;
- said upper branch conduit configured to allow transfer of heat carrier particles from the combustor to the gasifier;
- said upper branch conduit having an upper portion, a middle portion, and a lower portion;
- said lower portion of the upper branch conduit optionally having an upper branch non-mechanical device permitting control of rate of passage of said heat carrier particles from the combustor to the gasifier;
- said method comprising monitoring, while the dual-bed gasification apparatus is in operation, a plurality of pressures, each pressure at a location within the dual-bed gasification apparatus, and increasing or decreasing one or more of:
- (a) the rate of passage of the heat carrier particles from the combustor to the gasifier by operating the upper branch non-mechanic device;
- and (b) increasing or decreasing the rate of passage of the heat carrier particles from the gasifier to the combustor, by operating the lower branch non-mechanic device;
- when one or more of said plurality of pressures, or where the difference between two of said plurality of pressures reach a defined threshold.
Dependencies are inferred from the claim text.