Refrigeration – Refrigeration producer – Sorbent type
Reexamination Certificate
1999-09-20
2001-08-28
Doerrler, William (Department: 3744)
Refrigeration
Refrigeration producer
Sorbent type
C062S476000
Reexamination Certificate
active
06279343
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a high temperature regenerator for an absorption water cooling and heating machine, and in particular a high temperature regenerator for an absorption water cooling and heating machine, which improves boiling and flowing of a lithium bromide solution (LiBr solution) heated in the high temperature regenerator and which is suitable for lessening corrosion and deterioration of a liquid side heat transfer surface of the high temperature regenerator.
BACKGROUND OF TECHNOLOGY
Conventionally, there have been known several kinds of high temperature regenerators for absorption water cooling; and heating machines, for example, Japanese Laid-Open Patent No. H8-193767 discloses a high temperature regenerator for an absorption water cooling and heating machine. Specifically, this high temperature regenerator has such a structure that a large number of solution tubes which communicates the upper and lower parts of a liquid chamber with each other, are arranged, standing close together, in a passage for combustion gas from a burner within the high temperature regenerator. The large number of solution tubes are divided into two groups, that is, two tube banks one of which is located in the vicinity of the burner so as be directly exposed to the flame, and the other one of which is located distant from the burner, and between which a space with no tubes standing close together, is defined. With this arrangement, the temperature of the flame can be lowered by causing the flame to impinge upon the tube bank located in the vicinity of the burner in order to restrain the generation of thermal NOx, thereby it is possible to aim at lowering the emission of NOx.
Alternatively, Japanese Patent Laid-Open H9-42800 proposes a high temperature regenerator in which dilute solution fed by a solution pump flows through a heat-exchanging tube bank located in the vicinity of a burner and having a high heat flux so as to effect forced convection.
However, the solution tubes in the above-mentioned prior art arrangements, all have circular cross-sectional shapes. In a liquid tube type high temperature regenerator using heat-exchanging tubes having circular cross-sectional shapes, liquid and vapor flow in only one vertically upward direction, and accordingly, all tubes exhibits a one-dimensional flow so as to cause boiling and rising streams. Meanwhile, combustion within the tube bank causes combustion gas to have a high temperature therewithin, accordingly, the heat flux of the solution tubes becomes higher. Conventionally, the higher the heat lux of the solution tubes which stand upright and have circular cross-sectional shapes, the larger the volume of produced vapors within the tubes, the flowing resistance is increased, and as a result, the circulating volume of the solution itself is reduced so that the concentration of the solution becomes locally higher at the heat-transfer surface. Thus, it has been found that the heat-transfer surface is corroded and deteriorated.
That is, if the heat flux of the solution tubes is high, the temperature of the walls of the solution tubes becomes high, and accordingly, the concentration of the solution at the heat-transfer surface becomes locally higher so as to corrode and deteriorate the heat-transfer surface. Thus, since inexpensive materials cannot be used for the solution tubes, the high temperature regenerator is extremely expensive.
Further, the arrangement as proposed by the Japanese Laid-Open Patent No. H9-42800 in which dilute solution from the solution pump flows through the heat-transfer tube bank so as to effect forced convection, is not preferable since the circulation volume of the solution in the high temperature regenerator is, in general, throttled during partial load operation of an absorption refrigerating machine but the high temperature regenerator with the forced convection cannot be operated in a partial load condition.
Accordingly, the present invention is devised in view of the above-mentioned disadvantages caused by the above-mentioned prior art, and accordingly, one object of the present invention is to provide a high temperature regenerator for an absorption water cooling and heating machine, which can prevent the concentration of solution liquid from becoming locally higher at heat-transfer surfaces of the high temperature regenerator so as to be inexpensive and to have a long use life, and in which the circulation volume of the solution can be controlled during partial load operation so as to carry out energy saving operation, and to restrain the generation of thermal NOx, thereby it is possible to aim at lowering the emission of NOx.
DISCLOSURE OF THE INVENTION
In order to achieve the above-mentioned object, according to a first feature of the present invention, there is provided a high temperature regenerator for an absorption water cooling and heating machine, including a burner, a combustion chamber, a solution passage, a coolant vapor outlet passage, a gas exhaust passage, outer and inner casings between which liquid chambers for reserving dilute solution are defined, the combustion chamber being incorporated in the inner casing so as to heat the solution in order to condense the solution for extracting coolant vapors from the solution, a plurality of solution tubes provided in the combustion chamber, communicated with liquid chambers located above and below the inner casing and having a sectional shape which is thin ovoid in the flowing direction of combustion gas, wherein flame from the burner impinges upon the plane solution tubes.
According to a second feature of the present invention in order to achieve the above-mentioned object, there is provided a high temperature regenerator for an absorption water cooling and heating machine, including a burner, a combustion chamber, a solution passage, a coolant vapor outlet passage, a gas exhaust passage, outer and inner casings between which liquid chambers for reserving dilute solution are defined, the combustion chamber being incorporated in the inner casing so as to heat the solution in order to condense the solution for extracting coolant vapors from the solution, a circulation volume control means for the solution in the high temperature regenerator, a combustion control means, a heat-exchanging means for carrying out heat-exchange between the combustion gas and the solution, and a gas-liquid separating means, the heat-exchanging means being composed of a first bank of plane tubes which are located in the vicinity of the burner and which are planer along the flowing direction of the combustion gas, and a second bank of plane tubes which are located in the vicinity of the combustion gas exhaust passage and which are planer along the flowing direction of the combustion gas. In the first tube bank, the solution tubes are plane tubes having a cross-sectional shape which is planar in the flowing direction of the combustion gas with no heat transfer fins being provided outside of the solution tubes, and in the second tube bank, the solution tubes are plane tubes having a cross-sectional shape which is thin-ovoid along the flowing direction of combustion gas with a larger number of heat transfer fins provided outside of the solution tubes on the downstream side of the combustion gas, but with a small number of heat transfer fins or with no heat transfer fins provided outside of the solution tubes on the downstream side of the combustion gas.
According to a third feature of the present invention in order to achieve the above-mentioned object, there is provided a high temperature regenerator for an absorption water cooling and heating machine, including a burner, a combustion chamber, a solution passage, a coolant outlet passage, a gas exhaust passage, outer and inner casings between which liquid chambers for reserving dilute solution is defined, the combustion chamber being incorporated in the inner casing so as to heat the solution in order to condense the solution for extracting coolant vapors from the solution, plane solution tubes communicat
Funaba Yasushi
Itou Norihiro
Miyake Satoshi
Ohuchi Tomihisa
Antonelli Terry Stout & Kraus LLP
Doerrler William
Hitachi , Ltd.
Shulman Mark
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