CN2239608Y

CN2239608Y - Spiral plate compound heat exchanger preventing cystallization

Info

Publication number: CN2239608Y
Application number: CN 95240362
Authority: CN
Inventors: 陈亚平
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 1995-08-21
Filing date: 1995-08-21
Publication date: 1996-11-06
Anticipated expiration: 2005-08-21

Abstract

The utility model relates to a heat exchanger for lithium bromide absorption refrigerating machines. The utility model is characterized in that a high-temperature solution heat exchange section, a low-temperature solution heat exchange section and the heat transferring surface of a condensed water heating section are entirely wrapped in a spiral plate heat exchanger and separated by axial separating bars; all passages are divided into right and left passages by longitudinal separating bars, and the ends of the right and left passages are communicated; fluid returns from the passages at one side to the passages at the other side; the distances between the passages can be made into different dimensions according to the requirement of the flow velocity; the heat of the fluid at both sides is transferred upstream; right and left passages at the side of the condensed water respectively heat the dilute solution of the outlet and the dilute solution before the inlet of the low-temperature solution heat exchange section. The heating method can raise the temperature of the dilute solution cooling concentrated solution (particularly at a low load) to restrain the temperature of the outlet of the concentrated solution to prevent crystallisation.

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

1. the spiral plate type composite type heat interchanger of the crystallization of using on the lithium-bromide absorption-type refrigerating machine prevented, it is characterized in that heat exchanger is a spiral heat exchanger, except that be provided with the condensate water heat exchange segment 3., the cryogenic fluid heat exchange segment 2., for double-effect process, also set up the pyrosol heat exchange segment 1., the heat transfer of this three part and roll into helical form successively, wherein the condensate water heat exchange segment 3. with the cryogenic fluid heat exchange segment 2. weak solution import and export one section curved surface altogether; Be provided with axial divider (8) between each exchange section, and in each heat exchanging segment between the heat transfer plate with longitudinal subdivision bar (7), two passages about being separated into, its end is connected.

2. the spiral plate type composite type heat interchanger of preventing crystallization according to claim 1, it is characterized in that the heat exchanger center is symmetrical arranged two halves circular central chamber, condensate water import (5), outlet (11), low-temperature zone 2. dilute solution inlet (10), outlet (3) are separately positioned on four the semicircle end caps in central lumen both sides, and two central lumen middle part is respectively equipped with semicircle demarcation strip (6).

3. the spiral plate type composite type heat interchanger of preventing crystallization according to claim 1 is characterized in that 2. concentrated solution import of cryogenic fluid heat exchange segment (4), outlet (9), lays respectively at the heat exchanger both sides.

4. according to claim 1 or the 2 or 3 described spiral plate type composite heat exchangers of preventing crystallization, it is characterized in that intermediate solution outlet (1), the import (2) 1. of pyrosol heat exchange segment, high temperature section is dilute solution inlet (13) 1., and outlet (12) is arranged on the outer ring.