JPH0473560A - Regenerator for absorption type freezer - Google Patents

Abstract

PURPOSE:To prevent a corrosion of a device wall and attain compacting in size of the device by a method wherein a furnace cylinder and a chimney channel communicating with the furnace cylinder are stored and mounted within an outer shell of a main body of a regenerator and a liquid descending passage for returning solution from an upper part to a lower part is formed adjacent to both outer ends of the outer shell of the main body of the regenerator. CONSTITUTION:Solution (medium) absorbing refrigerant vapor is supplied from a solution supplying port 15A at a lower central part of a outer shell 1A of a main body into the outer shell 1A of the main body, heated by a combustion flame within a furnace cylinder 5A, ascends along an outer surface of a wall of the furnace cylinder 5A, passes through a heat conducting pipe 24A of a chimney channel 16A while boiling and further the solution is heated, ascends and then a part of refrigerant is evaporated and refrigerant vapor of high temperature is transferred from a refrigerant vapor outlet 19a to a condensor. Remained solution passes through an over-flow port 27A, an over-flow liquid accumulator 22A, a liquid down passage 26A, a circulation liquid accumulator 25A and a flow returning port 28A, returns back to a bottom part of the outer shell 1A of the main body and circulated again. The solution circulating passage is partitioned by a side wall of the outer shell 1A of the main body so as to make a complete separation of the liquid ascending part and descending part, thereby a reverse flow or a staying of solution flow at a heat transmitting surface of the furnace wall is prohibited and an over-heating of solution is prevented.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a regenerator for an absorption refrigerator.

[Prior Art] FIG. 2 is a diagram showing the system principle of an absorption refrigerator using a general lithium bromide (LiBr) aqueous solution as a medium. In the figure, 1 is a regenerator, 2 is an absorber, 3 is a condenser, and 4 is an evaporator. These main devices are connected by piping to form a system. The refrigerant vapor generated in the evaporator 4 is absorbed into a solution in the absorber 2, and the solution is transferred to the regenerator 1 via the solution pump 9, heated by the combustion gas in the furnace cylinder 5, and the refrigerant chikum is condensed. The medium enters the vessel 3, is cooled and condensed, and is returned to the expander 4, where the medium circulates in a closed loop, performing evaporation → absorption → vapor pressure (pressurization) → condensation, and by heat transfer by the so-called Rankine cycle, hot water is generated. Heat source I2 and cold water heat r
Supplied as X13.

FIG. 3 is a sectional view of a conventional regenerator (used as the regenerator 1 in FIG. 2) used in the absorption refrigerator. In the figure, IB is the outer shell of the main body, 5B is the furnace tube installed in the outer shell of the main body, 6B is the burner that radiates flame into the furnace tube, and 16■3 is the burner for passing the combustion exhaust from the burner. ,
Flue leading to furnace tube 5B, 7B is exhaust pipe leading to the same flue, 18
B is a gas-liquid separator provided in the upper part of the device, 17I3 is a downcomer pipe that communicates the gas-liquid separator 18B with the lower part of the main body outer shell IB, and 15B is provided in the lower part of the main body outer shell IB. The absorption liquid supply port 19B is a refrigerant vapor outlet connected to the upper part of the gas-liquid separator 18B.

In this regenerator, the solution that has absorbed the refrigerant is supplied from the absorption liquid supply port 15B, and is passed through the wall of the furnace tube 5B to the burner 6.
It is heated by the heat of the flame B, and the main body outer shell IB and the flue 1
6B, the liquid rises while being further heated and enters the gas-liquid separator 18B, where the refrigerant vapor is separated. enters and circulates. Refrigerant vapor is sent out from refrigerant vapor outlet 19B.

[Problem to be solved by the invention]

In the conventional regenerator, in the medium liquid flow path surrounded by the main body outer shell IB surrounding the furnace tube 5B and the flue 16B, the flow of the medium is not uniform and stagnation occurs, causing the medium to locally overheat. However, there was a drawback that it caused corrosion of the vessel wall. The present invention aims to provide a regenerator which is designed to have a uniform circulating flow of medium to prevent corrosion of the vessel wall and to be made more compact.

[Means for Solving the Problems] The present invention solves the above-mentioned problems, and includes a furnace cylinder and a flue connected to the furnace cylinder housed inside the outer shell of the regenerator body. In contact with the outside of both ends of the main body shell,
The present invention relates to a regenerator for an absorption refrigerator characterized by forming a descending path for refluxing a solution from an upper part to a lower part.

[Effect]

In the regenerator of the present invention, the flow of the solution due to natural convection within the main body is made to be only an upward flow by forming downflow paths for refluxing the solution in contact with the outer shell of the main body at both ends of the outer shell of the main body. Since backflow and stagnation of the solution can be eliminated, corrosion and wear of the heat transfer surface due to overheating and concentration of the solution (LiBr aqueous solution) can be prevented. Furthermore, since the outer shell of the main body is used as one side wall of the downflow path, compactness can be achieved.

〔Example〕

FIG. 1 is a cross-section of one embodiment of the regenerator of the present invention (used as the regenerator 1 in FIG. 2). In the figure, IA is the outer shell of the main body, 5A is the cylindrical furnace tube provided at the inner lower part of the outer shell of the main body, and 1.6A is connected to the furnace tube,
A flue with a rectangular cross section is installed horizontally in the center of the main body outer shell IA, 24A is a heat exchanger tube installed vertically in the flue, and 7A is an exhaust pipe connected to the outlet of the flue. , 6A is a burner that emits flame into the furnace tube 5A, 2OA is the main body outer shell IA
19A is a refrigerant vapor outlet connected to the mist separator, 15A is an absorption liquid supply port provided in the raw part of the outer shell of the main body, and 27A is on the upper side wall of the outer shell of the main body IA. 22A is an overflow reservoir provided outside the bath outlet, 23A is a downfall channel wall provided outside the main body outer shell IA, and 26A is a connection between the downfall channel wall and the main body. a liquid drop path formed between the outer shell IA and connected to the overflow liquid reservoir 22A;
25A is a circulating fluid reservoir connected below the descending passage 26A, 28
A is a reflux port provided at the lower part of the main body outer shell IA so as to communicate the circulating fluid reservoir with the inside of the main body outer shell IA.

In the regenerator having the structure described above, a solution (medium) that has absorbed refrigerant vapor is supplied to the inside of the main body outer shell IA from the solution supply port 15A provided at the bottom center of the main body outer shell IA,
The heat exchanger tubes are heated by the combustion flame in the furnace tube 5A through the wall of the furnace tube 5A, rise along the outer surface of the wall of the two furnace tubes 5A, and are disposed in the flue 16, II while heating. The refrigerant passes through the inside of the refrigerant 24A and is further heated and rises to L, a part of the refrigerant evaporates, and the high-temperature refrigerant vapor is transferred from the refrigerant vapor outlet 19A to the condenser (equipment 30 in FIG. 2). The remaining solution is stored in the bath flow 27A, overflow liquid reservoir 22A, and t liquid path 26A.
, the circulating fluid reservoir 25A, and the reflux port 28A are red and white, and the fluid returns to the inner bottom of the outer shell IAO of the main body and is circulated again.

Generally, the solution in the regenerator is heated and boiled, and due to the temperature rise and the difference in density of the fluid due to boiling bubbles, a circulating flow is formed due to natural convection Q within the regenerator. Such self-circulating flow force 5 causes the combustion flame temperature and gas flow within the furnace tube 5A to be uneven in the axial and circumferential directions, causing turbulence and stagnation due to the heat load on the furnace wall heat transfer surface. For this reason, the solution is locally superheated and concentrated on the heat transfer surface of the furnace wall, and the corrosion force on the wall surface is accelerated. In this invention, the solution circulation path is separated by the side wall of the main body outer shell IA, and the ascending and descending sections of the solution are completely separated, thereby preventing backflow and stagnation of the solution flow on the heat transfer surface of the furnace wall. This prevents overheating.

〔Effect of the invention〕

The regenerator for an absorption refrigerator of the present invention houses and installs a furnace cylinder and a flue connected to the furnace cylinder inside the outer shell of the regenerator main body, and
The outer shell of the regenerator main body is in contact with both ends of the outer shell to form a descending path for refluxing the solution from the upper part to the lower part, so the circulation flow of the solution becomes a -like flow and corrosion of the vessel wall is prevented. At the same time, it can be made more compact.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a diagram of the system principle of a general absorption refrigerator, and FIG. 3 is a sectional view of a conventional regenerator for an absorption refrigerator. l... Regenerator, IA], B... Regenerator body outer shell, 2... Absorber, 3... Condenser, 4... Evaporator, 5.5A, 5B... Furnace cylinder, 6 6A 6B...Burner, 7.7A, 7B...Exhaust pipe, 8...Circulation pump,
9... Absorption liquid pump, 10... Hot water, 11...
・Cold water, I2... Hot water heat source, 13... Cold water heat source, 14... Cooling water system, 15A, 15B... Absorption liquid supply port, 16A,] 6B river flue, 17B... Raw solution pipe, 1,
8 B... Gas-liquid separator, 19A, 19B... Refrigerant vapor outlet, 2OA... Mist separator, 22A... Overflow liquid pool, 23A... Downfall e, road wall, 24A...・Heat transfer tube, 25A...Circulating fluid reservoir, 2
6A... Downfall channel, 27A... Outlet, 28A.
... Reflux port. Agent: Patent Attorney Sakama In

Claims (1)

[Claims] A furnace cylinder and a flue connected to the furnace cylinder are housed inside the outer shell of the regenerator body, and a falling path is formed in contact with the outside of both ends of the outer shell of the regenerator body to circulate the solution from the upper part to the lower part. A regenerator for an absorption refrigerator characterized by: