Disclosed is a method for setting parameters of a load feedforward controller for superheated steam temperature control, which belongs to the technical field of thermal automatic control. This method adds a load feedforward controller to the conventional boiler superheated steam temperature spray desuperheating cascade control system. The application provides a structure of the load feedforward controller, and a method for designing the parameters of the load feedforward controller according to the dynamic characteristics of the superheated steam temperature related to feed coal flow disturbance, feedwater flow disturbance and desuperheating water spray disturbance. The method of the application could effectively reduce the superheated steam temperature deviation in the process of unit load rise or drop, and the design method is simple, effective and easy to realize in engineering.

Disclosed is a method for setting parameters of a load feedforward controller for superheated steam temperature control, which belongs to the technical field of thermal automatic control. This method adds a load feedforward controller to the conventional boiler superheated steam temperature spray desuperheating cascade control system. The application provides a structure of the load feedforward controller, and a method for designing the parameters of the load feedforward controller according to the dynamic characteristics of the superheated steam temperature related to feed coal flow disturbance, feedwater flow disturbance and desuperheating water spray disturbance. The method of the application could effectively reduce the superheated steam temperature deviation in the process of unit load rise or drop, and the design method is simple, effective and easy to realize in engineering.

A method for improving the efficiency of a Rankine cycle by reducing cold end loss, comprising: for a Rankine cycle with a reheat-cycle, reducing temperature of reheat steam or removing a reheat steam system, and for a Rankine cycle with regenerative steam extraction-heat, reducing temperature of main steam and increasing humidity of main steam.

A wall-fired burner includes a fuel tip defining a fuel direction axis and a fuel tip pivot axis perpendicular thereto. A first air tip is adjacent to the fuel tip. The first air tip defines a first air direction axis and a first air tip pivot axis perpendicular thereto. A second air tip is adjacent to the fuel tip, opposite from the first air tip across the fuel tip. The second air tip defines a second air direction axis and a second air tip pivot axis perpendicular thereto. A mechanism operatively connects the fuel tip, the first air tip and the second air tip for at least one of independent and/or joint movement of the fuel tip, the first air tip and the second air tip.

A method for improving the efficiency of a Rankine cycle by reducing cold end loss, comprising: for a Rankine cycle with a reheat-cycle, reducing temperature of reheat steam or removing a reheat steam system, and for a Rankine cycle with regenerative steam extraction-heat, reducing temperature of main steam and increasing humidity of main steam.

Method and system for adjusting a measured reheat outlet steam temperature (R.sub.PV) to approximate a reheat outlet steam temperature setpoint (R.sub.SP) in a boiler. An R.sub.PV is compared to an R.sub.SP. If the R.sub.PV is less than the R.sub.SP and a position of a fuel nozzle tilt (TILT.sub.PV) is below a high limit of the fuel nozzle tilt (TILT.sub.HIGH), the TILT.sub.PV is increased while a flow rate of a secondary flue gas recirculation (SFGR.sub.PV) is kept constant. If the R.sub.PV is less than the R.sub.SP and the TILT.sub.PV is at the TILT.sub.HIGH, the SFGR.sub.PV is increased. If the R.sub.PV is greater than the R.sub.SP and the SFGR.sub.PV is greater than a low limit of flow rate of the SFGR (SFGR.sub.LOW), the SFGR.sub.PV is decreased, while the TILT.sub.PV is kept constant. If the R.sub.PV is greater than the R.sub.SP and the SFGR.sub.PV is at the SFGR.sub.LOW, the TILT.sub.PV is decreased.

Method and system for adjusting a measured reheat outlet steam temperature (R.sub.PV) to approximate a reheat outlet steam temperature setpoint (R.sub.SP) in a boiler. An R.sub.PV is compared to an R.sub.SP. If the R.sub.PV is less than the R.sub.SP and a position of a fuel nozzle tilt (TILT.sub.PV) is below a high limit of the fuel nozzle tilt (TILT.sub.HIGH), the TILT.sub.PV is increased while a flow rate of a secondary flue gas recirculation (SFGR.sub.PV) is kept constant. If the R.sub.PV is less than the R.sub.SP and the TILT.sub.PV is at the TILT.sub.HIGH, the SFGR.sub.PV is increased. If the R.sub.PV is greater than the R.sub.SP and the SFGR.sub.PV is greater than a low limit of flow rate of the SFGR (SFGR.sub.LOW), the SFGR.sub.PV is decreased, while the TILT.sub.PV is kept constant. If the R.sub.PV is greater than the R.sub.SP and the SFGR.sub.PV is at the SFGR.sub.LOW, the TILT.sub.PV is decreased.

A ground supported single drum power boiler is described combining a refractory lined and insulated V-Cell floor; refractory lined and insulated combustion chamber; integrated fuel chutes configured to pre-dry wet solid fuel; top mounted fuel bin; internal chamber walls; configurable combustion air systems; and a back pass with after-burner ports and cross flow superheaters. The boiler can be configured in pre-assembled modules to minimize the field construction time and cost. An alternative embodiment is adaptable as a gasifier.

A ground supported single drum power boiler is described combining a refractory lined and insulated V-Cell floor; refractory lined and insulated combustion chamber; integrated fuel chutes configured to pre-dry wet solid fuel; top mounted fuel bin; internal chamber walls; configurable combustion air systems; and a back pass with after-burner ports and cross flow superheaters. The boiler can be configured in pre-assembled modules to minimize the field construction time and cost. An alternative embodiment is adaptable as a gasifier.

A boiler system is provided comprising: a furnace adapted to receive a fuel to be burned to generate hot working gases; a fuel supply structure associated with the furnace for supplying fuel to the furnace; a superheater section associated with the furnace and positioned to receive energy in the form of heat from the hot working gases; and a controller. The superheater section may comprise a platen including a tube structure with an end portion and a temperature sensor for measuring the temperature of the tube structure end portion and generating a signal indicative of the temperature of the tube structure end portion. The controller may be coupled to the temperature sensor for receiving and monitoring the signal from the sensor.