Refrigeration – Refrigeration producer – Sorbent type
Reexamination Certificate
2002-07-09
2004-01-13
Paik, Sang Y. (Department: 3744)
Refrigeration
Refrigeration producer
Sorbent type
C062S238300
Reexamination Certificate
active
06675608
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an absorption cold or hot water generating machine, and more particularly to an absorption cold or hot water generating machine which is driven by an exhaust gas, can effectively utilize a high-temperature exhaust gas discharged from an external apparatus such as a gas turbine to increase exhaust heat utilization efficiency, and can be compact.
2. Description of the Related Art
In the case where an absorption cold or hot water generating machine is driven by a high-temperature exhaust gas having a temperature of about 200 to 400, when the absorption cold or hot water generating machine is operated for air cooling, it is known that the high-temperature exhaust gas is utilized in double effect, and is utilized in single effect when the temperature of the exhaust gas is lowered, thus increasing exhaust heat utilization efficiency. Such absorption cold or hot water generating machine has been proposed in Japanese patent publication No. 57-20543, Japanese laid-open patent publication No. 11-304274, and the like.
However, in the above conventional absorption cold or hot water generating machine, the circulation flow of absorption solution imposes restrictions on an arrangement of constituent equipment, and an exhaust gas path for allowing an exhaust gas serving as a heat source of a generator to pass therethrough and an absorption solution piping for allowing absorption solution to pass therethrough are complicated, and hence it is difficult for the absorption cold or hot water generating machine to be compact.
Further, in the above conventional absorption cold or hot water generating machine, because the absorption solution piping is extended in a complicated manner, and an exhaust heat recovery generator and a low-temperature generator have the same pressure, a pump must be separately provided or a potential head must be utilized to feed absorption solution. In the case of utilizing the potential head, the arrangement of constituent equipment is limited by a positional relationship, i.e. height relationship.
In order to construct the absorption cold or hot water generating machine into a compact unit, it is necessary to arrange the position of the upper surface of the exhaust heat recovery generator at a height equal to or lower than the height of a low-temperature shell or casing comprising an absorber, an evaporator, a low-temperature generator and a condenser.
In the absorption cold or hot water generating machine disclosed in the Japanese laid-open patent publication No. 11-304274, an exhaust heat recovery generator is provided at a position higher than a low-temperature shell comprising an absorber, an evaporator, a low-temperature generator and a condenser to facilitate circulation of solution. However, such absorption cold or hot water generating machine has a disadvantage that the absorption cold or hot water generating machine has a large height and is not compact.
Further, in the absorption cold or hot water generating machine disclosed in the Japanese laid-open patent publication No. 11-304274, it is necessary to provide a pump separately to feed absorption solution from an exhaust heat recovery generator or a low-temperature generator to a high-temperature generator having a higher pressure.
The specific volume of the high-temperature exhaust gas serving as a heat source is very large, and a volume flow rate of the high-temperature exhaust gas becomes large. In the case where the high-temperature exhaust gas is led at a large volume flow rate to the high-temperature generator, and then the exhaust heat recovery generator, a large installation volume is required to provide an exhaust gas path depending on the manner in which the exhaust heat recovery generator is arranged.
In the absorption cold or hot water generating machine disclosed in the Japanese patent publication No. 57-20543, if an exhaust gas path is extended in a complicated manner, it is difficult to make the absorption cold or hot water generating machine compact.
Further, gas-liquid separation in the exhaust heat recovery generator generally requires a large volume, and hence the dimension of a gas-liquid separator becomes a bar to provide the exhaust gas path.
SUMMARY OF THE INVENTION
The present invention has been made in view of the above drawbacks in the prior art, and it is therefore a first object of the present invention to provide an absorption cold or hot water generating machine which is driven by an exhaust gas, can effectively utilize a high-temperature exhaust gas by a simple apparatus structure, and has a high thermal efficiency.
A second object of the present invention is to provide an absorption cold or hot water generating machine which is driven by an exhaust gas, and can be compact in an overall structure by improving connecting relationship of constituent equipment within a cycle.
In order to achieve the first object, according to a first aspect of the present invention, there is provided an absorption cold or hot water generating machine comprising: an absorber; a low-temperature generator; an exhaust heat recovery generator; a high-temperature generator; a condenser; an evaporator; a solution path and a refrigerant path for connecting the absorber, the low-temperature generator, the exhaust heat recovery generator, the high-temperature generator, the condenser, and the evaporator; and an exhaust gas path for introducing a high-temperature exhaust gas serving as a heat source into the high-temperature generator, and then the exhaust heat recovery generator; wherein the low-temperature generator comprises a liquid film-type generator in which solution is sprayed on a heat transfer tube bank, and the refrigerant vapor generated in the exhaust heat recovery generator is led to the heat transfer tube bank of the low-temperature generator.
In the absorption cold or hot water generating machine, the absorption solution heated and concentrated in the low-temperature generator by the refrigerant vapor supplied from the high-temperature generator should be led to the exhaust heat recovery generator. Further, in the exhaust gas path of the high-temperature exhaust gas in the high-temperature generator, a burner for combusting fuel supplied from the outside should be provided to cope with the shortage of cold or hot water capacity.
In the absorption cold or hot water generating machine which utilizes the high-temperature exhaust gas, in order to utilize the quantity of heat of the exhaust gas as much as possible as a heat source of the high-temperature generator for thereby increasing thermal efficiency, it is necessary to lower the temperature in the high-temperature generator.
According to the present invention, in order to lower the condensation temperature of the refrigerant vapor supplied from the high-temperature generator for thereby lowering the boiling temperature in the high-temperature generator, the heat transfer of the low-temperature generator is improved for thereby lowering the boiling temperature.
The low-temperature generator comprises a liquid film-type generator for spraying solution on the heat transfer tube bank to increase the heat transfer, and the rise of boiling pressure and boiling temperature which may be caused by the liquid level in the case of a flooded-type generator can be prevented.
Further, a condenser may be provided for each of the low-temperature generator and the exhaust heat recovery generator. However, in the present invention, a single condenser is used for both the low-temperature generator and the exhaust heat recovery generator to make an overall apparatus compact. Further, the refrigerant vapor (in some cases refrigerant vapor contains droplets of solution) is led to the tube bank of the low-temperature generator, and both of the low-temperature generator and the exhaust heat recovery generator share gas-liquid separation to make the overall apparatus compact and reduce the cost of the apparatus.
Further, solution having a lower concentration than solution in the e
Endo Tetsuya
Inoue Naoyuki
Drake Malik N.
Ebara Corporation
Paik Sang Y.
Westerman Hattori Daniels & Adrian LLP
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