CN2239608Y - Spiral plate compound heat exchanger preventing cystallization - Google Patents

Abstract

A heat exchanger used in a lithium bromide absorption refrigerator, the main feature of which is that the heat transfer surfaces of the high-temperature solution heat exchange section, the low-temperature solution heat exchange section and the condensed water heating section are all coiled in a spiral plate heat exchanger, They are separated from each other by an axial divider; all channels are divided into two left and right channels by a longitudinal divider, and the ends of the two are connected, and the fluid returns from one side to the other. The distance between the channels can be adjusted according to the flow rate. It needs to be made into different sizes; all the fluids on both sides are countercurrent heat transfer; the left and right channels on the condensate side heat the dilute solution at the outlet of the low-temperature solution heat exchange section and the dilute solution before the inlet respectively. This heating method can increase the temperature of the dilute solution that cools the concentrated solution (especially at low load), and clamps the outlet temperature of the concentrated solution to prevent crystallization.

Description

Can prevent the spiral plate type composite type heat interchanger of crystallization

The utility model relates to heat exchanger on the refrigeration machine, particularly about the heat exchanger of lithium-bromide absorption-type refrigerating machine.

Common faults is crystallization in the refrigerator operation process.When it mainly occurs in underload,, in generator, will produce phenomenon excessively takes place when refrigeration duty descends then heating steam amount when on the high side relatively, strong solution concentration is increased, when concentrated solution flow to the heat exchanger outlet place,, depart from the crystallization line easily by the lower weak solution cooling of temperature.In case crystallization, then passage stops up, and refrigerator operation is interrupted.For double-effect process, the complex form of conventional heat exchanger is a condensate water weak solution heating to the cryogenic fluid heat exchanger outlet of heating steam on the refrigeration machine, does not prevent the function of crystallization.And, generally do not establish the condensate water heat exchanger for the single-action flow process.In addition, traditional heat exchanger is a shell-and-tube on the refrigeration machine, and heat-transfer pipe adopts light pipe or low fin copper tube, and cost is higher.

The utility model at refrigeration machine existing the problems referred to above, provided a kind of spiral plate type composite type heat interchanger that uses for economic benefits and social benefits and single-effect lithium bromide absorption refrigerating machine of preventing crystallization.

The utility model is a spiral heat exchanger, it be divided into the pyrosol heat exchange segment 1., the cryogenic fluid heat exchange segment 2., 3. three parts of condensate water heat exchange segment, be provided with the outlet of high temperature section intermediate solution (1), import (2), weak solution outlet (3), concentrated solution import (4), condensate water import (5), center cavity semicircle demarcation strip (6), longitudinal subdivision bar (7), axially divider (8), concentrated solution outlet (9), dilute solution inlet (10), condensate water outlet (11), the outlet of high temperature section weak solution (12), import (13).For double-effect process, high temperature section 1., low-temperature zone 2., the condensate water section 3. this three part heat transfer and roll into helical form successively, be provided with axial divider (8) between each exchange section, wherein condensate water heat exchange segment condensate water side 3. is to carry out heat exchange with cryogenic fluid heat exchange segment weak solution side extension 2., to heating into and out of low-temperature zone weak solution 2., make the weak solution temperature that low-temperature zone concentrated solution is 2. cooled off improve, thereby make concentrated solution be difficult for crystallization.Particularly when underload, quantity of steam is on the high side relatively, takes place easily excessively and strong solution concentration is increased, and is easy to knot product, because this moment, condensate flow was more, can make the temperature raising of weak solution more and make the concentrated solution side be difficult for crystallization.And two passages about being separated into longitudinal subdivision bar (7) between the heat transfer plate in each heat exchanging segment do not hold at it to be connected, and carry out countercurrent flow.

The relative prior art of the utility model has the following advantages: 1. can prevent crystallization, the heat exchanger structure of other pattern is difficult to be arranged as condensate water with simple method solution heat exchange segment import and export weak solution is all heated; 2. owing to fluid all is to flow in helical duct, flow velocity is suitable, and is subjected to the secondary stream of centrifugal action generation and the perturbation action of spacing column, makes the boundary-layer attenuate, and heat transfer coefficient improves than shell-and-tube heat exchanger; 3. spiral-plate heat exchanger is formed by roll of steel plate weldering, owing to be provided with the longitudinal subdivision bar between the heat exchanger heat transfer face, can make the weld length of both ends of the surface shorten half, and makes the more well-balanced of the diameter of heat exchanger and width, and structure is more compact; 4. can be applicable to economic benefits and social benefits and single-action unit.

Accompanying drawing 1 is the utility model front view.

Accompanying drawing 2 is the utility model left view.

Accompanying drawing 3 is the utility model spiral plate heat transfer path expanded view.

Embodiment of the present utility model is as follows: condensate water import (5), outlet (11), dilute solution inlet (10), outlet (3) are separately positioned on four semicircle end caps in both sides of heat exchanger central lumen, the central lumen middle part then is provided with two semicircle demarcation strips (6), as initiating terminal the heat exchanger heat transfer plate is separated into the left and right sides; Condensate water section condensate water side 3. is to carry out heat exchange with cryogenic fluid heat exchange segment weak solution side extension 2., thereby can be to 2. export and import weak solution heating of low-temperature zone; At condensate water side end axial divider (8) is set, then rolls the low-temperature zone of heat exchanger again and 2. concentrated solution import of low-temperature zone (4), outlet (9) are set, axial divider (8) is set respectively at its end in the initiating terminal both sides of concentrated solution wing passage; For double-effect process, set up high temperature section 1. in the outer ring again, roll high temperature weak solution section and high temperature intermediate solution section jointly, in the outer ring of helical form heat exchanger, high temperature section 1. intermediate solution outlet (1), import (2) are set respectively, and high temperature section is dilute solution inlet (13), outlet (12) 1..

Claims (4)

1. A crystallization-resistant spiral plate compound heat exchanger used on a lithium bromide absorption refrigerator is characterized in that the heat exchanger is a spiral plate heat exchanger, except that it is provided with a condensed water heat exchange section ③, a low-temperature solution heat exchanger In addition to the exchange section ②, for the double-effect process, a high-temperature solution heat exchange section ① is also added. The heat transfer of these three parts is sequentially rolled into a spiral shape, among which the condensate heat exchange section ③ and the low-temperature solution heat exchange section ② dilute solution The inlet and outlet sections have a common curved surface; there are axial partitions (8) between the exchange sections, and the longitudinal partitions (7) between the heat transfer plates in each heat exchange section are divided into two left and right channels, and the ends are Connected. 2. The anti-crystallization spiral plate composite heat exchanger according to claim 1, characterized in that two semicircular central chambers are arranged symmetrically in the center of the heat exchanger, and the condensed water inlet (5), outlet (11), The inlet (10) and outlet (3) of the dilute solution in the low temperature section are respectively arranged on the four semicircular end covers on both sides of the central chamber, and the middle of the two central chambers is respectively provided with a semicircular partition plate (6). 3. The anti-crystallization spiral plate composite heat exchanger according to claim 1, characterized in that the low-temperature solution heat exchange section ② concentrated solution inlet (4) and outlet (9) are respectively located on both sides of the heat exchanger. 4. The anti-crystallization spiral plate compound heat exchanger according to claim 1, 2 or 3, characterized in that the intermediate solution outlet (1) and inlet (2) of the high-temperature solution heat exchange section ①, and the high-temperature section ① is thin The solution inlet (13) and the outlet (12) are arranged on the outer ring.

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