JPH058248U - Absorption condensing heat exchanger - Google Patents

Abstract

(57) [Abstract] [Purpose] In an absorption-condensation heat exchanger, an absorption liquid that absorbs heat transfer medium vapor is reliably sprayed onto a heat transfer surface to efficiently absorb heat transfer medium vapor. In addition, a stable operation can be performed even under partial load. A shell 1; a plurality of heat transfer plates 8 arranged vertically inside the shell 1; a cooling medium is supplied to the inside of the shell 1; The outer heat transfer surface of the heat transfer plate 8 is provided with a flow path (tray 11) that also has small holes through which the absorbing liquid flows. Furthermore, a plurality of partition plates provided in the flow path and having different heights, and an absorbing liquid supply means provided near the partition plate having a lower height among the partition plates are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention is used in absorption refrigerators, mixed heat medium plants, heat pumps, etc. It relates to an absorption condensation heat exchanger.

[0002]

[Prior art]

  A conventional absorption-condensation heat exchanger will be described with reference to FIGS.

[0003]   14 and 15, the heat transfer surface on which the absorbing liquid is sprayed and the heat medium vapor is absorbed. 10 is shown. The absorbing liquid is sprinkled on the heat transfer surface 10 while absorbing the heat medium vapor. Run down. 15 and 16 are the outlet and inlet passages of the cooling water, and the seal packing 12 , 13 prevents the absorbing liquid from flowing out onto the heat transfer surface 10. 16 and 17, the heat transfer surface 9 through which the cooling water flows is shown. Cooling water Inflow from the cooling water inlet channel 16 below the heat surface 9 and cooling water channel 1 above the heat transfer surface 9 Outflow from 5. The cooling water is supplied by the seal packing 14 installed on the four sides of the heat transfer surface. The heat transfer surface 10 does not flow out of the heat transfer surface 10.

[0004]   As shown in FIG. 12 and FIG. 13, these heat transfer surfaces 9 and 10 are respectively formed on the outer surface. And a plurality of heat transfer plates 8 formed on the inner surface are arranged in the shell 1 with a space vertically between them. By doing so, the heat transfer surface 10 for absorbing and condensing and the heat transfer surface 9 for cooling are exchanged. Mutually configured, cooling water inlet pipe 5, cooling water outlet pipe 4, heat medium vapor inlet nozzle 2, suction By attaching the liquid collecting inlet nozzle 3 and the liquid condensing liquid discharging nozzle 7 to the shell 1, It constitutes a heat reduction exchanger.

[0005]   The cooling water flows in from the cooling water inlet pipe 5, passes through the cooling water inlet flow path 16, and is transferred to the heat transfer surface 9 After being cooled, it flows out from the cooling water pipe 4 through the cooling water outlet channel 15. Absorption liquid , Through the absorption liquid inlet nozzle 3 provided in the upper part of the shell 1, for example It is sprayed on the heat transfer surface 10 as shown by the arrow in the play. The heating medium vapor is The heat transfer surface enters from the heat medium vapor inlet nozzle 2 provided in the upper part and fills the shell 1 10 is absorbed by the absorbing liquid flowing above to become the condensed liquid 6 and is formed in the lower part of the shell 1. It flows out from the liquid outflow nozzle 7.

[0006]

[Problems to be solved by the device]

  In the conventional absorption-condensation heat exchanger described above, the absorption liquid flowing from the absorption liquid inlet nozzle is For example, since it is sprayed on the heat transfer surface by the spray nozzle, it is absorbed on a place other than the heat transfer surface. There is a problem that the amount of the liquid is large and the heat medium vapor cannot be absorbed efficiently.

[0007]   In addition, in the absorption condenser, the absorption liquid flowing down on the heat transfer surface is always adjusted to the optimum liquid film thickness. It is an indispensable condition to keep it. However, in the conventional absorption-condensation heat exchanger, Due to the structure of the device that sprays the absorbing liquid, the heat exchanger must be designed mainly based on the planned operating conditions. Therefore, under the planned operating conditions, the absorption liquid is the optimum liquid film for the entire heat transfer surface. Although it disperses and flows down depending on the thickness, if it deviates from the planned operating conditions such as partial load operation , The liquid film thickness of the absorbing liquid becomes improper, or the dispersion of the absorbing liquid becomes uneven, resulting in heat exchange. There was a problem that the performance of the vessel deteriorated extremely.

[0008]   The present invention provides an absorption condensation heat exchanger that can solve the above problems. It is the one to try.

[0009]

[Means for Solving the Problems]

  The absorption-condensation heat exchanger of the present invention takes the following measures. 1. The shell and the shell are arranged vertically inside the shell and the cooling medium is supplied to the inside of A plurality of heat transfer plates having a heating surface in contact with the heat transfer medium vapor; and a heat transfer plate provided above the heat transfer plates. And a flow path having a small hole through which the absorbing liquid flows on the outer heat transfer surface. 2. In the first aspect of the present invention, a plurality of partition plates provided in the flow path and having different heights are provided. A partition plate having an absorption liquid supply means provided near the partition plate having a low height among the partition plates. There is.

[0010]

[Action]

  In the first aspect of the present invention, the absorbing liquid in the flow path passes through the small holes in the flow path, and the outer heat transfer surface of the heat transfer plate. It is evenly distributed on the upper side and flows down on the outer heat transfer surface to absorb the heat medium vapor. Therefore, suck Since the collected liquid is not sprayed on other than the outer heat transfer surface, the amount of absorbed liquid is reduced and the heat medium is reduced. The vapor is efficiently absorbed.

[0011]   In addition, even if the amount of absorption liquid flowing into the flow path changes due to changes in operating conditions, the heat transfer plate The state of dispersion of the absorbing liquid on the outer heat transfer surface of the Stable operation of the exchanger is performed.

[0012]   In the second aspect of the present invention, in addition to the operation of the first aspect of the present invention, the absorbent supply means is provided with a flow path. It was installed near the partition with the lowest height among the partitions with different heights As a result, the liquid level of the absorbing liquid in the flow channel changes due to the change in the supply amount of the absorbing liquid to the flow channel. When it becomes solid, the spread area of the absorbing liquid is expanded or reduced. By this, the heat transfer plate The thickness of the absorption liquid film on the outer heat transfer surface and the dispersion of the absorption liquid are always kept in an appropriate state, Even if there is a change in the amount of absorption liquid supplied to the flow path, the heat medium vapor is efficiently absorbed by the absorption liquid. Be done.

[0013]

【Example】

  A first embodiment of the present invention will be described with reference to FIGS.

[0014]   This embodiment describes the absorption-condensation heat exchanger shown in FIGS. 12 to 17 below. It has been improved in such a way that it has the same configuration except for the parts described below. Therefore, the same reference numerals are given to the same portions and the description thereof will be omitted.

[0015]   That is, in this embodiment, absorption and condensation by the absorbing liquid on the outer surface of the heat transfer plate 8 is performed. Between the upper portions of the heat transfer surfaces 10 adjacent to each other, a plurality of small fluid communicating with the absorbing liquid inlet nozzle 3 are provided. A tray 11 for absorbing liquid is provided which has holes.

[0016]   In this embodiment, the absorbing liquid that has flowed into the tray 11 from the absorbing liquid inlet nozzle 3 is (A) Dispersed from a plurality of small holes provided in (11), sprayed on the heat transfer surface (10) and flowed down, It will not be sprayed on other than the heat transfer surface 10. This allows the heat medium vapor to be efficiently absorbed. It is possible to reduce the amount of the absorbing liquid used while being absorbed by the collecting liquid.

[0017]   The flow rate Q of the absorbing liquid sprayed from the tray to the heat transfer surface 10 is represented by the following equation (1). .

[0018]

[Equation 1]

[0019] Where β: flow coefficient (usually about 0.6)         A: Channel cross-sectional area (total area of small holes)         g: Gravity acceleration         h: Jet pressure (head difference) Is.

[0020]   When the small holes are circular holes, the flow rate Q is

[0021]

[Equation 2]

[0022]         d: Diameter of small hole in tray         n: Number of small holes It is represented by.

[0023]   Therefore, the number n of small holes should be as large as possible so that the heat transfer surface 10 can be spread evenly. It is desirable to be able to do it, and it is desirable that the pitch is about 10 mm. . In addition, the number of small holes is set so that a predetermined absorption liquid flow rate Q can be obtained by the equation (2). n and the diameter d are selected.

[0024]   A second embodiment of the present invention will be described with reference to FIGS. In this example, In the first embodiment, the tray is provided with a partition plate as will be described below. ing.

[0025]   That is, the end of the absorbing liquid inlet nozzle 3 should be located above one end of the tray 11. The tray 11 is installed in parallel with a space between the one end and the other end of the tray 11. A plurality of partition plates 11-1 are provided so that the height of the partition plates 11 is the absorption liquid inlet nozzle. It is gradually increasing from the one closer to 3 to the one farther. In addition, the adjacent partition plate 11-1 A plurality of circular small holes 11-2 are provided in parallel with the partition plate 11-1.

[0026]   The height of the partition plate 11-1 is such that the state in which the absorbent is sprayed from each small hole 11-2 is the tray 3 To produce an optimum liquid film thickness on the heat transfer surface 10 regardless of the amount of absorbed liquid flowing in from The flow rate is set so that, for example, when the inflow of absorbing liquid is small, As shown in 0, it is absorbed only in a part of the heat transfer surface 10 that absorbs the heat medium vapor that is laminated. When the liquid is sprayed and the amount of absorbed liquid inflow is large, heat medium vapor is absorbed as shown in FIG. The absorbing liquid is sprayed over the entire heat transfer surface 10. Note that FIG. 10 and FIG. In No. 1, 11-3 is the liquid level of the absorbing liquid.

[0027]   In this embodiment configured as described above, in addition to the functions and effects of the first embodiment, Even in the operation that deviates from the planned conditions such as partial load, the absorption liquid in the tray 11 Partition plates 1 provided on the tray 11 at different heights when the liquid level 11-3 changes The distribution area of the absorbing liquid varies depending on 1-1. This allows the tray 11 It is possible to generate an optimum liquid film thickness and dispersion on the heat transfer surface 10 from the small number of small holes 11-2. The absorbing liquid is sprayed at a flow rate that is possible, and the heat medium vapor can be efficiently absorbed by the absorbing liquid. Wear.

[0028]   In this embodiment, the ejection pressure (head difference) h in the above equation (2) is This corresponds to the height of the cutting plate, and the absorption liquid calculated by the above equation (2) The flow rate Q can be set to an appropriate value by appropriately setting the height of each partition plate. It

[0029]

[Effect of device]

  As described above, in the present invention according to claim 1, the absorbing liquid is the heat medium vaporizing medium of the heat transfer plate. Since it is evenly dispersed on the outer heat transfer surface that absorbs air and flows down on the outer heat transfer surface, All of the absorbing liquid that has entered absorbs and condenses the heat medium vapor and realizes efficient heat exchange. be able to.

[0030]   In addition, even if the amount of absorbed liquid flowing into the flow path changes due to changes in operating conditions, the outer heat transfer surface Stable operation of absorption and condensation heat exchanger without changing the state of spraying absorption liquid be able to.

[0031]   In addition, the present invention according to claim 2 has the effects of the present invention according to claim 1. In addition, even when operating the absorption condensation heat exchanger that deviates from the planned conditions such as partial load, the heat medium The absorption liquid film thickness and absorption liquid generated on the outer heat transfer surface that absorbs vapor are always the maximum. It is kept in an appropriate state, and it is possible to prevent deterioration of the performance of the absorption and condensation heat exchanger.

[Brief description of drawings]

FIG. 1 is a side sectional view of a first embodiment of the present invention.

2 is a cross-sectional view taken along the line II of FIG.

FIG. 3 is a front view of a heat transfer surface for performing absorption and condensation according to the same embodiment.

FIG. 4 is a side view of the heat transfer surface.

FIG. 5 is a front view of a heat transfer surface on the cooling water side of the embodiment.

FIG. 6 is a side view of the heat transfer surface.

FIG. 7 is a side sectional view of a second embodiment of the present invention.

FIG. 8 is a front sectional view of the embodiment.

FIG. 9 is a perspective view of the tray of the embodiment.

FIG. 10 is an explanatory diagram of the tray during low load operation.

FIG. 11 is an explanatory diagram of the tray during high load operation.

FIG. 12 is a side sectional view of a conventional absorption condensation heat exchanger.

FIG. 13 is a front sectional view of the conventional absorption-condensation heat exchanger.

FIG. 14 is a front view of a heat transfer surface for performing absorption and condensation of the conventional absorption and condensation heat exchanger.

FIG. 15 is a side view of the heat transfer surface.

FIG. 16 is a front view of a heat transfer surface on the cooling water side of the conventional absorption and condensation heat exchanger.

FIG. 17 is a side view of the heat transfer surface.

[Explanation of symbols]

1 Heat exchanger shell 2 Heat medium vapor inlet nozzle 3 Absorbing liquid inlet nozzle 4 Cooling water outlet piping 5 Cooling water inlet piping 6 reconstitution 7 Condensate outflow nozzle 8 heat transfer plate 9,10 Heat transfer surface 11 trays 11-1 Partition board 11-2 Small hole 11-3 Level of absorbing liquid in tray 15 Cooling water outlet channel 16 Cooling water inlet channel

Claims (2)

[Scope of utility model registration request] 1. A shell, a plurality of heat transfer plates arranged vertically in the shell, a cooling medium is supplied to the inside thereof, and an outer heat transfer surface of the shell contacts the steam of a heat transfer medium, and the heat transfer plates are provided above the heat transfer plates. And a flow path having a small hole through which an absorbing liquid flows on the outer heat transfer surface of the heat transfer plate. 2. A plurality of partition plates having different heights provided in the flow path, and an absorbing liquid supply means provided near the partition plate having a lower height among the partition plates. The absorption-condensation heat exchanger according to claim 1.