摘要:
A circulating fluidized bed (CFB) boiler has one or more bubbling fluidized bed enclosures containing heating surfaces and located within a lower portion of the CFB boiler to provide an in-bed heat exchanger (IBHX). Solids in the bubbling fluidized bed are maintained in a slow bubbling fluidized bed state by separately controlled fluidization gas supplies. The beds feature open bottom distribution grids with hoppers disposed below to collect solids. The enclosure defining the IBHX is supported from structures below the grids and the enclosure can be supported from the hoppers.
摘要:
A circulating fluidized bed furnace (10) comprising an outer furnace wall (10r), surrounding an inner combustion space (10c) of a circulating fluidized bed type, and a heat exchange chamber (20), which is friction-locked to said outer furnace wall, wherein said heat exchange chamber is further supported by one or more structural elements (50), each of which being provided with two ends, a first end (50f) being fixed to a section of the furnace wall, while a second end (50s) being fixed to the heat exchange chamber at an offset to the furnace wall.
摘要:
A circulating fluidized bed (CFB) boiler comprising a reaction chamber (1). A bubbling fluidized bed (BFB) (4) is contained within an enclosure within the lower portion of the reaction chamber and contains an in-bed heat exchanger (IBHX) (3) that occupies part of the reaction chamber floor. At least one non-mechanical valve (40), which includes an opening between the CFB and BFB (4) and independently controlled fluidizing means located both upstream and downstream of the opening, is used to control the heat transfer to the IBHX (3) by controlling the solids discharge from the BFB (4) to the CFB. The elevation of the bottom of the opening is at or above the elevation of the fluidizing means. A flow control barrier may be located downstream of the opening.
摘要:
A pressurized internal circulating fluidized-bed boiler is incorporated in a combined-cycle electric generating system in which a fuel such as coal, petro coke or the like is combusted in a pressurized fluidized bed and an exhaust gas produced by the combusted fuel is introduced into a gas turbine. The pressurized internal circulating fluidized-bed boiler includes a pressure vessel, a combustor disposed in the pressure vessel and a main fluidized bed combustion chamber provided with an air diffusion device. A thermal energy recovery chamber is partitioned from the main combustion chamber by an inclined partition wall. A fluidized medium flows into and out of the main combustion chamber and the thermal energy recovery chamber. A free board is provided integrally above the main combustion chamber and the thermal energy recovery chamber so that combustion gas from the main combustion chamber and the thermal energy recovery chamber is mixed in the free board.
摘要:
In a fluidized bed reactor (10) particles are internally circulated, moving down the walls forming the reactor chamber (12, 112, 312). A particle chamber (22, 122, 222, 322) having a particle gathering top wall with a horizontal projection area A is disposed in the downward flow of particles. Openings (32, 132, 232, 332), e.g., holes or slots, with a controlling dimension of about 30 mm or less are provided in the top wall, the openings having total open area B less than half the area A. Heat transfer surfaces (40, 140) may be disposed in the particle chamber.
摘要:
Method and apparatus for recovering heat from solid particles in a fluidized bed reactor, utilizing a heat transfer chamber, having heat transfer surfaces disposed therein. Hot solid particles are continuously fed into the heat transfer chamber and gas is introduced into and discharged from the heat transfer chamber. Gas is introduced into the heat transfer chamber for controlling the flow of solid particles therein. The heat transfer chamber is divided into at least one heat transfer zone (46, 46') and at least one solid particle transport zone (48), by providing more heat transfer surfaces in the heat transfer zones than in the solid particle transport zones. The heat transfer is controlled by introducing separately controlled flows of gas (50, 50', 50') into the heat transfer zones and the solid particle transport zones.
摘要:
A pressurized internal circulating fluidized-bed boiler is incorporated in a combined-cycle electric generating system in which a fuel such as coal, petro coke or the like is combusted in a pressurized fluidized bed and an exhaust gas produced by the combusted fuel is introduced into a gas turbine. The pressurized internal circulating fluidized-bed boiler includes a pressure vessel, a combustor disposed in the pressure vessel and a main fluidized bed combustion chamber provided with an air diffusion device. A thermal energy recovery chamber is partitioned from the main combustion chamber by an inclined partition wall. A fluidized medium flows into and out of the main combustion chamber and the thermal energy recovery chamber. A free board is provided integrally above the main combustion chamber and the thermal energy recovery chamber so that combustion gas from the main combustion chamber and the thermal energy recovery chamber is mixed in the free board.
摘要:
A control circuit (B) adapted to vary the vapor pressure in a boiler drum (17), which receives heat from a combustion chamber (3) in a fluidized bed boiler (A, C), in accordance with the quantity of heat recovered at the boiler drum (17), and improve a responsiveness for suppressing or controlling an increase or a decrease of the vapor pressure, which is caused by the variations of a vapor load. The vapor pressure in the boiler drum (17) is detected with a pressure gauge (20b), and the heat recovering air flow rate is controlled according to the vapor pressure, while a combustible material supply unit (12, 13, 14) for feeding combustible to the boiler (A, C) is also controlled accordingly.