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4375959 Waste heat recovery in asphalt mixing plant
New Patents
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A multiple reaction zone process for dehydrogenating light hydrocarbons, preferably propane, is disclosed. The feed stream and intermediate streams are first heated by indirect heat exchange to temperatures slightly below the desired inlet temperature of the dehydrogenation catalyst beds. These streams are then transported to a location which is in close proximity of the dehydrogenation catalyst bed and further heated by the selective combustion of hydrogen present in these streams through the use of beds of oxidation catalyst. This eliminated lengthy high temperature reactant residence times in transfer lines extending between fired heaters and the dehydrogenation catalyst bed, thereby reducing thermal cracking of the feed and increasing the selectivity of the process. The process has special utility with stacked moving bed reactors, which have larger volume reactant transfer lines.
363
A hollow fiber-type artificial lung having an enclosed heat exchanger comprises a first housing and a second housing connected together coaxially. A gas exchange chamber is defined in the first housing by a pair of spaced walls and a bundle of hollow fibers designed for gas exchange arranged in the first housing and between the pair of walls. The hollow fiber bundle is preferable constricted at the central portion to increase the packing ratio of the hollow fibers. The second housing is connected to the first housing by way of a blood chamber and has a pair of spaced apart walls, and multiple tubes which extend lingthwise between the pair of walls to effect heat exchange between a circulating heat exchange medium and the blood flowing through the multiple tubes.
4375959 WASTE HEAT RECOVERY IN ASPHALT MIXING PLANT Roger A. Powell; assigned to The McCarter Corporation
4376095
HOLLOW FIBER-TYPE ARTIFICIAL LUNG HAVING ENCLOSED HEAT EXCHANGER Hiroshi Hasegawa; assigned to Terumo Corporation A 3
4
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In an asphalt mixing plant, a portion of the heat used to vaporize water in the process of drying aggregate is recovered by conduction dryer exhaust gases through parallel ducts which extend serially through the aggregate cold feed bins. The parallel ducts are vertically elongated for optimum heat transfer and to avoid impeding aggregate flow. The ducts have vertically extending external fins for greater contact with the aggregate in the
364
New Patents
bins. The also have horizontally extending internal fins for improved heat transfer between the exhaust gases and the ducts. The ducts are peaked, and conforming protective caps are provided to prevent damage to the ducts during loading of the bins. Water injection is used to initiate condensation of water vapor in the exhaust gases.
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4375831 i¸
GEOTHERMAL STORAGE HEATING AND COOLING S Y S T E M James E. Downing
An indoor space environment heating and cooling system in which a massive thermal storage unit is interposed between a geothermal heat energy storage capacity-the earth-and a heat pump heating and/or cooling apparatus for controlling and maintaining the envionment in an indoor living space. A fluid circulation apparatus is provided to circulate a working fluid from the massive thermal storage unit directly to a heat exchanger in the indoor space environment conditioning apparatus, to provide cooling when the temperature of the thermal storage unit is less than the temperature in the living space.
A heating system utilizing solar panels and buried round conduits to collect and store heat which is delivered to a heatpump heat exchanger. A heat.distribution fluid continuously circulates through a ground circuit to transfer heat from the ground to the heat exchanger. The ground circuit includes a length of buried ground conduit, a pump, a check valve and the heat exchanger. A solar circuit, including a solar panel and a second pump, is connected in parallel with the check valve so that the distribution fluid transfers solar heat to the heat exchanger for utilization and to the ground conduit for storage when the second pump is energized. A thermostatically instrumented control system energizes the second pump only when the temperature differential between the solar panel inlet and outlet temperatures exceeds a predetermined value and the ground temperature is less than a predetermined value. Consequently, the distribution fluid flows through the solar panel only when the panel is capable of supplying significant heat to the remainder of the system without causing excessive drying of the ground.
4375806
437~ HEATING SYSTEM M U L T l P ~ POSITION LEG Paul J. Nishman; assigned to Spencer Products Company
ASSEMBLY
FORA
HEAT
EXCHANGE UNIT
L
t
1t//
ii -'I
-
,
T"
"'"
A multiple reaction zone process for dehydrogenating light hydrocarbons, preferably propane, is disclosed. The feed stream and intermediate streams are first heated by indirect heat exchange to temperatures slightly below the desired inlet temperature of the dehydrogenation catalyst beds. These streams are then transported to a location which is in close proximity of the dehydrogenation catalyst bed and further heated by the selective combustion of hydrogen present in these streams through the use of beds of oxidation catalyst. This eliminated lengthy high temperature reactant residence times in transfer lines extending between fired heaters and the dehydrogenation catalyst bed, thereby reducing thermal cracking of the feed and increasing the selectivity of the process. The process has special utility with stacked moving bed reactors, which have larger volume reactant transfer lines.
363
A hollow fiber-type artificial lung having an enclosed heat exchanger comprises a first housing and a second housing connected together coaxially. A gas exchange chamber is defined in the first housing by a pair of spaced walls and a bundle of hollow fibers designed for gas exchange arranged in the first housing and between the pair of walls. The hollow fiber bundle is preferable constricted at the central portion to increase the packing ratio of the hollow fibers. The second housing is connected to the first housing by way of a blood chamber and has a pair of spaced apart walls, and multiple tubes which extend lingthwise between the pair of walls to effect heat exchange between a circulating heat exchange medium and the blood flowing through the multiple tubes.
4375959 WASTE HEAT RECOVERY IN ASPHALT MIXING PLANT Roger A. Powell; assigned to The McCarter Corporation
4376095
HOLLOW FIBER-TYPE ARTIFICIAL LUNG HAVING ENCLOSED HEAT EXCHANGER Hiroshi Hasegawa; assigned to Terumo Corporation A 3
4
,, ~_, ~,,,,~ , ¢-
] 6 3?
,
~
~l
2 3 2 7 4,?.
.~ ,~,,
6 ~ , ~ s ~ ~"
~x~t/~~'
In an asphalt mixing plant, a portion of the heat used to vaporize water in the process of drying aggregate is recovered by conduction dryer exhaust gases through parallel ducts which extend serially through the aggregate cold feed bins. The parallel ducts are vertically elongated for optimum heat transfer and to avoid impeding aggregate flow. The ducts have vertically extending external fins for greater contact with the aggregate in the
364
New Patents
bins. The also have horizontally extending internal fins for improved heat transfer between the exhaust gases and the ducts. The ducts are peaked, and conforming protective caps are provided to prevent damage to the ducts during loading of the bins. Water injection is used to initiate condensation of water vapor in the exhaust gases.
//
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
1
"
L~_-~.____
_
~
~...J
I
t
4375831 i¸
GEOTHERMAL STORAGE HEATING AND COOLING S Y S T E M James E. Downing
An indoor space environment heating and cooling system in which a massive thermal storage unit is interposed between a geothermal heat energy storage capacity-the earth-and a heat pump heating and/or cooling apparatus for controlling and maintaining the envionment in an indoor living space. A fluid circulation apparatus is provided to circulate a working fluid from the massive thermal storage unit directly to a heat exchanger in the indoor space environment conditioning apparatus, to provide cooling when the temperature of the thermal storage unit is less than the temperature in the living space.
A heating system utilizing solar panels and buried round conduits to collect and store heat which is delivered to a heatpump heat exchanger. A heat.distribution fluid continuously circulates through a ground circuit to transfer heat from the ground to the heat exchanger. The ground circuit includes a length of buried ground conduit, a pump, a check valve and the heat exchanger. A solar circuit, including a solar panel and a second pump, is connected in parallel with the check valve so that the distribution fluid transfers solar heat to the heat exchanger for utilization and to the ground conduit for storage when the second pump is energized. A thermostatically instrumented control system energizes the second pump only when the temperature differential between the solar panel inlet and outlet temperatures exceeds a predetermined value and the ground temperature is less than a predetermined value. Consequently, the distribution fluid flows through the solar panel only when the panel is capable of supplying significant heat to the remainder of the system without causing excessive drying of the ground.
4375806
437~ HEATING SYSTEM M U L T l P ~ POSITION LEG Paul J. Nishman; assigned to Spencer Products Company
ASSEMBLY
FORA
HEAT
EXCHANGE UNIT