Control systems and methods for controlling a dry feed system to convey a solid fuel

摘要

The invention generally relates to control systems and methods for a dry feed system to pneumatically convey a solid fuel to a container such as a gasifier. According to an aspect of the present invention, there is provided a control system for controlling a dry feed system to convey a solid fuel in a solid-gas mixture comprising a plurality of sensors, a pressuring gas controller, at least one assistant gas controller and a plurality of gas valves. The sensors generate a plurality of measurement signals signifying characteristics of the dry feed system. The pressuring gas controller calculates one or both of a feed tank pressure bias and a pressuring gas flow bias based on a solid flow rate (SR) in the solid-gas mixture that is determined by at least one of the measurement signals and generates at least one first control signal based on one or both of the pressure bias and the pressurizing gas flow bias. The at least one assistant gas controller calculates an assistant gas bias based on a solid loading ratio (SLR) in the solid-gas mixture that is determined by at least one of the measurement signals and generates at least one second control signal based on the assistant gas bias. The gas valves are driven by one or both of the first and second control signals to regulate the solid fuel in the solid-gas mixture by changing a real time pressurizing gas flow and a real time assistant gas flow