4455154 Heat exchanger for coal gasification process

4455154 Heat exchanger for coal gasification process

New Patents parameter using an equation. According to the equation, the ratio of efficiency change over overall boiler efficiency equals the time fact...

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New Patents parameter using an equation. According to the equation, the ratio of efficiency change over overall boiler efficiency equals the time factor since the last sootblowing operation times the parameter minus a summation of factors for each of the other heat traps and their associated sootblowing operations. A method is also disclosed for enhancing a sootblowing operation wherein, with a plurality of heat traps, sootblowing is performed in an upstream heat trap in preference to a downstream heat trap, when both heat traps are near a fouled condition which would require sootblowing. This prevents premature fouling of a downstream heat trap which has recently been cleaned by soot blown off an upstream heat trap.

4455154 HEAT EXCHANGER FOR COAL GASIFICATION PROCESS George A Blasiole assigned to The United States of America as represented by the United States Department of Energy This invention provides a heat exchanger, particularly useful for systems requiring cooling of hot particulate solids, such as the separated fines from the product gas of a carbonaceous material gasification system. The invention allows effective cooling of a hot particulate in a particle stream (made up of hot particulate and a gas), using gravity as the motive source of the hot particulate. In a preferred form, the invention substitutes a tube structure for the single wall tube of a heat exchanger. The tube structure comprises a tube with a core disposed within, forming a cavity between the tube and the core, and vanes in the cavity which form a flow path through which the hot particulate falls. The outside of the tube is in contact with the cooling fluid of the heat exchanger.

4455835 THERMAL ENERGY STORAGE AND RECOVERY APPARATUS AND METHOD FOR A FOSSIL FUEL-FIRED VAPOR GENERATOR Oliver Durrant assigned to The Babcock & Wilcox Company Apparatus and method for storing excess thermal energy of a fossil fuel-fired vapor generator

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during low demand periods and for recovering the stored thermal energy for use during high demand periods. A first moving bed heat exchanger is provided for flowing a bed of refractory particles in heat exchange relation with vapor generator flue gases to receive thermal energy therefrom. At least a portion of the bed of heated refractory particles is stored. A second moving bed heat exchanger is provided for flowing at least a portion of the bed of heated refractory particles in heat exchange relation with a fluid to impart thermal energy to the fluid for use.

4455841 HEAT-ACTUATED HEAT PUMPING APPARATUS AND PROCESS Jaroslav Wurm, John A Kinast assigned to Institute of Gas Technology A heat actuated heat pumping apparatus and process having two working chambers to provide a Vuilleumier cycle for space conditioning. The working chamber volumes are in pressure communication with each other in the vicinity of intermediate thermal exchange means in each volume equalizing the pressure between the two working volumes with one module acti.ng as the driver for the heat pumping action of the second module. Pressure communication may be maintained through a floating piston thereby providing two different intermediate heat rejection temperature levels resulting in a four temperature level Vuilleumier heat pump. The apparatus and process of this invention reduces mechanical complexity and improved thermal exchange in a heat pump system suitable for large air conditioning applications and hot water heating as well as small refrigeration and cryogenic applications.

4456526 METHOD FOR MINIMIZING FOULING OF HEAT EXCHANGERS Richard Miller, Ting S Go assigned to Atlantic Richfield Company Hydrocarbon process equipment is protected against fouling by incorporating into the hydrocarbon being processed small amounts of a composition comprised of a dialkylhydroxylamine and a tertiary alkylcatechoi.