Abstract:
An entrained flow coal gasifier having a combustor zone (16) and a reductor zone (18) separated by a centrally located baffle (14). The baffle (14) covers the projected plan area of a slag tap (44) whereby cool slag falling from the reductor (18) will be heated before flowing through the slag tap.
Abstract:
A monitoring and control apparatus (220) adapted to monitor the combustion of each individual burner (224) in a furnace (1). It includes at least one laser (221) for providing a beam (223) through a flame of a burner (224) in a furnace (1), and at least one detector (222) for detecting the beams (223) after they pass through/near the flame. The monitored signal is passed to an electronics unit (215) that calculates optimum conditions for this burner (224). The electronics unit (215) then causes control unit (214) to adjust the fuel, primary air and secondary air feeds each individual burner (224) to result in a more efficient system that reduces the amount of emissions released.
Abstract:
A method is provided which refurbishes a Rankine cycle vapor generator initially having a plurality of Rankine heaters for supporting a Rankine cycle subsystem. The method removes at least one of the Rankine heaters, and replaces the at least one removed Rankine heater with a non-Rankine heater for a Kalina cycle subsystem. The vapor generator comprises a first plurality of tubes for receiving a first working fluid, and a second plurality of tubes for receiving a second working fluid. The first plurality of tubes are directed along a first path exposed to heat from a heat source to increase the temperature of the first working fluid within the first plurality of tubes. The second plurality of tubes are directed along a second path exposed to heat from the heat source to increase the temperature of the second working fluid within the second plurality of tubes. The first plurality of tubes supply the heated first working fluid to components of a Rankine cycle subsystem and the second plurality of tubes supply the heated second working fluid to components of a Kalina cycle subsystem.
Abstract:
A soot blower assembly (10) for use in combination with a coal gasifier (14). The soot blower assembly is adapted for use in the hot combustible product gas generated in the gasifier as the blowing medium. The soot blower lance (20) and the drive means (30) by which it is moved into and out of the gasifier is housed in a gas tight enclosure (40) which completely surrounds the combination. The interior of the enclosure (40) is pressurized by an inert gas to a pressure level higher than that present in the gasifier so that any combustible product gas leaking from the soot blower lance (20) is forced into the gasifier rather than accumulating within the enclosure.
Abstract:
A unique nozzle [20] for a fluidized bed reactor is described that may be replaced efficiently. This employs a collar [30, 130, 230] attached to a vertical section [15] of a feed pipe [11] that provides fluidizing gases. The vertical section [15] has a plurality of nozzle openings [17] at its upper end. A nozzle cap [19] fits over the upper end of the vertical section [15] and the nozzle openings [17]. The collar [30, 130, 230] extends radially outward from the vertical section [15] at a location just below the nozzle cap [19] supporting it in its operational position. During replacement of the vertical section [15] and the nozzle cap [19], the collar acts as a guide to direct cutting equipment to the proper location and facilitate proper cuts. The collar [30, 130, 230] also acts as a support to hold the vertical section [15] and the nozzle cap [19] in proper position to facilitate welding.
Abstract:
A fluidized bed combustion system is disclosed and in particular a fluidized bed combustion system particularly well suited for the combustion of oil shale, generating steam thereby. The fluidized bed combustion system includes a furnace volume having a multi-chambered upper segment thereof, a deentrainment zone, a fluidized bed having a plurality of isolatable segments thereof, a fluidized bed ash cooler having a plurality of isolatable segments thereof wherein the fluidized bed ash cooler is in fluid communication with the furnace volume, a fuel supply means in fluid communication with the furnace volume for delivering oil shale thereto for combustion therein, a backpass volume defined by a plurality of backpass wall tubes integral to a thermodynamic steam cycle and in fluid flow relation with the furnace volume and a plurality of circulatory fluid flow paths integral to a thermodynamic steam cycle and operative to conduct the flow of steam or water therethrough.
Abstract:
A black liquor gasification system intended for use as a replacement for a Tomlinson cycle, Chemical Recovery Unit, and which operates at a temperature below the ash melting temperature thereby removing the potential for smelt-water reactions and explosions. The subject black liquor gasification system is based on the use of a circulating fluidized bed operating at atmospheric pressure that produces dry, recoverable salts as well as low calorific gases to be used within the paper-making process.
Abstract:
A wet-bottom, solid fuel gasifier has a slag tap through which a portion of the product gas is back-flowed through the slag tap to maintain the temperature of the slag hot enough to maintain continuous slagging. The reverse flow of the product gas portion is controlled by the negative pressure generated in the throat of the gasifier.
Abstract:
A method and an assembly for efficiently converting waste water to a gaseous state in a fossil fuel-fired power generation system is provided. The method includes feeding the slurry to the spray dryer reactor, the slurry having a predetermined ratio of liquid to absorbent, and controlling the feed rate of the slurry into the spray dryer reactor as a function of the monitored sulfur oxide level such that the sulfur oxide level is maintained within an acceptable range. The method also includes supplying supplemental liquid in the form of waste water into the spray dryer reactor in a non-proportionate manner relative to the feed of absorbent into the spray dryer reactor such that the ratio of liquid to absorbent in the spray dryer reactor changes. Both the supply rate of supplemental liquid into the spray dryer reactor and the temperature of the flue gas entering the spray dryer reactor are controlled in dependence upon the temperature of the flue gas exiting the spray dryer reactor such that, in the event that the sensed temperature of the flue gas exiting the spray dryer reactor is below a minimum acceptable flue gas exit temperature, the supply rate of supplemental liquid is controlled according to a prescribed manner.
Abstract:
A kraft black liquor gasification system is provided with a hot flue gas generator which serves both as a means for generating a hot flue gas to warm-up the gasifier in preparation for start-up and as a means for generating an inert purge gas to purge the gasifier of flammable gases in the event of an emergency trip of the gasifier. A control system controls the operation of the burner during warm-up in response to the gasifier temperature and during the purge in response to the purge gas composition and temperature.