JPS59225264A - Device in which engine and absorption refrigerator are combined - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is directed to a device that combines an engine and an absorption chiller, that is, hot water flowing out from the engine jacket (hereinafter referred to as
This invention relates to a device (hereinafter referred to as this type of device) that recovers heat from engine cooling water to drive an absorption refrigerator, and adjusts the temperature of the engine cooling water returned to the engine to a set temperature using a radiator.

(b) Prior art Conventionally, in this type of device, for example,
As explained in Publication No. 7, a bypass path is provided in the heat recovery circuit that connects the engine jacket and the absorption refrigerator, and the flow rate of hot water (engine cooling water) flowing through this bypass path is adjusted according to the cooling load. The heat recovery circuit trap is provided with a heat exchanger to flow cooling water into the heat exchanger trap, and the flow rate of this cooling water is adjusted to control the heating amount of the generator of the absorption chiller. A known method is to maintain the warm water (engine cooling water) that returns to the engine jacket at a set temperature.

In other words, in this conventional means, when the cooling load becomes small, the flow rate of the engine cooling water flowing into the heat transfer tube of the heater provided in the generator of the absorption refrigerator is reduced, and the exchange between the absorption liquid in the generator and the engine cooling water is reduced. The amount of heat exchange is reduced to reduce the refrigerating capacity of the absorption refrigerator. However, if the flow rate of the engine cooling water is reduced too much, the engine cooling water in the heat transfer tube becomes laminar, increasing the heat transfer resistance and deteriorating the heat transfer performance of the heater. There is a drawback that heat exchange is not carried out well and the capacity of the absorption refrigerator is reduced too much. In particular, this system recovers the heat of the engine cooling water obtained from each jacket of multiple engines installed in parallel to drive the absorption refrigerator, and also starts and stops the engine and engine cooling water pump. In this type of equipment, as the number of engines and pumps that are stopped increases, the flow rate of engine cooling water supplied to the generator of the absorption refrigerating machine decreases, which tends to cause excessive reduction in the capacity of the absorption refrigerating machine.

(c) Purpose of the Invention The present invention addresses excessive reduction in the capacity of an absorption chiller that tends to occur when the flow rate of engine cooling water supplied to the generator of the absorption chiller decreases, such as when the load is low or the number of engines in operation decreases. The purpose of the present invention is to provide a device capable of preventing engine cooling water from occurring and returning engine cooling water maintained below a set temperature to the engine.

2) Structure of the Invention The present invention provides an apparatus of this kind in which a generator of an absorption refrigerator is provided with a plurality of heaters, and when the flow rate of engine cooling water supplied to the generator decreases, the engine cooling water is stopped flowing. By reducing the number of heaters and providing a control mechanism that uses a radiator to adjust the temperature of the cooling water that returns to the engine, the length or number of heat exchanger tubes (heat exchanger tube group) of the heater through which engine cooling water passes can be The cross-sectional area of This prevents excessive reduction in the capacity of the absorption refrigerating machine, and allows engine cooling water below a set temperature to be returned to the engine.

(E) Embodiment FIG. 1 is a schematic diagram showing an embodiment of the device of the present invention.
(1), (I) are engines installed in parallel, (2) is an absorption refrigerator, (3) is a radiator, (4) is an engine (1),
(1) and the heat sink (3) are connected in parallel l-
The engine cooling water circuit (5) is the engine cooling water pump. Also, (6) is a generator, (force is a condenser,
(8) is an evaporator, (9) is an absorber, and oo) is a solution heat exchanger. The absorption refrigerator (2) is constructed by connecting the pipes (1 concentrated liquid pipe) in an airtight trap (161).

aη is the heater for the generator (6), a is the cooler for the condenser (7), a is the water cooler for the evaporator (8), and (4) is the absorber (
9) cooler and (21) is a cooler for radiator (3),
The water cooler (LLIC) connects two cold water pipes (2) to supply cold water to the load-side heat exchanger (not shown), and the cooler (21) has a cooling water pipe (c) connected to it. Seawater or other cooling water is connected to the absorber (9), the condenser (power supply), and the radiator (3) so that it flows in sequence.

(24)) Also, the engine cooling water heat recovery circuit provided in the engine cooling water circuit (4) via the first three-way valve (■1),
The upstream side of this heat recovery circuit is connected to the inlet header of the heat exchanger tube group constituting the heater aη, and the downstream side of the heat recovery circuit αη is connected to the outlet side header of the heat exchanger tube group to remove the heat from the engine jacket. High temperature cooling water is supplied to the generator (6) trap. In addition, a heat exchanger is formed in the middle part of the heat exchanger tube group of the heater (17), and the heater 0η is the first
It is vertically divided into a heater aη and a second heater aη, and a heat recovery bypass path bypassing the first heater αη is connected to the intermediate heater. (to),
(G) is a valve provided in the upstream heat recovery circuit (goods) and the heat recovery bypass path (goods). When the valve (G) is opened and the valve (G) is closed, the engine cooling water flows to the intermediate portion where holes and other flow paths are formed in the lug.

In addition, (25) is an engine cooling water radiator (3) provided with an engine cooling water circuit (4)K via a second three-way valve (V,).
) It is a bypass road.

(S,) is a cold water load detector, (Sρ is a detector that senses the engine jacket inlet side temperature of engine cooling water, (C
) is the chilled water load detector (S, ) and/or the detector (S
2), or the engine cooling water pump (
5), upon receiving the start/stop signals of (5), the first and second three-way valves (V
, ), (V,) This is a controller that controls the valves (V) and (me.

Next, an example of the operation of the apparatus of the present invention configured as described above will be explained.

(A) When two engines are in operation and the chilled water load decreases from 100% to 0%, the controller (C)
In response to the signal from the chilled water load detector (S,), the first three-way valve (
When the chilled water load increases, the heat recovery circuit (24) side flow of the engine cooling water circuit (24) is proportionally controlled from fully open to fully open, and the engine cooling water circuit (4) side flow is proportionally controlled from fully open to fully open. By controlling in the opposite direction when decreasing, ′
The flow rate of engine cooling water to the generator (6) is adjusted according to the cold water load. In addition, the controller (C) has a chilled water load of 50
%, fully open the valve (V) and close the valve (
V) is fully opened and the engine cooling water flows to the first heater (171
, 2nd heater (one stone is made to flow sequentially, and when the cold water load is less than 50%, the valve (V) is fully opened, and the co-busy valve (
V) is fully opened to control the engine cooling water so that it bypasses the first heater side and flows only through the second heater θη. By controlling the engine cooling water to bypass the first heater Q force, the flow resistance of the engine cooling water flowing through the heat exchanger tube of the second heater (I71) is reduced so that the engine cooling water is (171, a: 0) is approximately halved compared to (171, a: 0), so for example, if the cold water load is 100%
Even if the flow rate of engine cooling water to the generator (6) is halved by decreasing from will be maintained. In this way, at 50% load, the heat exchange area between engine cooling water and absorption liquid in the generator (6) is adjusted to half that of 100% load, and the heat transfer resistance of the heat transfer tubes is maintained at the same level. Therefore, the absorption refrigerating machine (2) can exhibit a refrigerating capacity corresponding to the 50% load, and can prevent insufficient capacity.

The controller (C) receives a signal from the detector (Sρ), and when the temperature sensed by this detector becomes higher than the set temperature of the controller (C), the controller (C) controls the second three-way valve (V,) to turn off the heat radiator. Increase the flow rate of engine cooling water to the radiator (3) side, and conversely reduce the flow rate of engine coolant to the radiator (3) side when the sensed temperature is lower than the set temperature. Controls the engine cooling water so that it returns to the set temperature.

(B) When one engine is in operation, for example,
The engine (1) is stopped and the controller (C) is filled with thin ice.
The power generator (17) is bypassed and only the second heater (1B) is controlled to flow. By controlling in this way, the refrigerating capacity of the absorption chiller is approximately half that of when two engines are operating. It is possible to prevent the capacity from decreasing excessively due to a decrease in the number of engines in operation.In this case, when the chilled water load exceeds 50%, the first three-way valve (VD heat recovery circuit (24 ) side flow path is fully opened, and when the chilled water load decreases from 50% to 0%, it is proportionally controlled from fully open to fully open.
Control to maintain the engine cooling water returned to the jacket at the set temperature in 1') is performed in the same way as when two engines are operating.

FIG. 2 is a partially enlarged schematic view of another embodiment of the device of the present invention, showing an embodiment in which the heater is divided horizontally. In FIG. 2, the same numbers are given to the same components as in FIG. 1.

In Figure 2, the first heater a7vc and the first heat recovery circuit (
24) is connected, and the i-th heat recovery circuit C2 (a) is connected to the second heater (16), and when the chilled water load decreases from 100% to 50%, the number of engines in operation decreases from 2 to 1.
When the amount of engine cooling water supplied to the generator (6) is reduced by half, the valve (V) is switched from fully open to fully closed so that the engine cooling water only flows through the second heater a6. The cross-sectional area of the heat transfer tube group through which engine cooling water passes is halved to prevent the flow velocity within the heat transfer tubes from decreasing too much.

Although not shown in the figure, if many engines are installed in parallel, divide the heater into the same number as the number of engines, and set the number of heaters through which engine cooling water flows to the same number as the number of stopped engines. It is preferable to prevent the capacity of the absorption chiller from decreasing excessively due to a decrease in the number of operating engines. Furthermore, even when there is only one engine, it is desirable to divide the heater into multiple parts so that the number of heaters through which engine cooling water flows is gradually reduced as the cold water load decreases. By doing so, it becomes possible to control the capacity of the absorption refrigerator in accordance with the load with even higher accuracy.

Furthermore, the valves (V) and (V) can be switched on and off using a signal from the load detector (S,) or the engine cooling water pump (5).
), (5), instead of using the start/stop signals, for example, a signal from a flow rate detector (not shown) provided in the heat recovery circuit (24) may be used.

In addition, with the conventional means in which the temperature is adjusted to the set temperature by exchanging heat between the engine cooling water returned to the engine cage (2018) and the cooling water returned to the absorption refrigerator using a heat radiation heat exchanger, the cooling load is small. In this case, the generator bypass amount of high-temperature cooling water from the jacket is adjusted to increase, and the amount of heat exchanged in the heat radiation heat exchanger increases, so the temperature of the cooling water that returns to the absorption chiller becomes higher and the capacity of the absorption chiller increases. It also has the disadvantage of further accelerating the decline. Therefore, in the system of the present invention, there is a method in which cooling water is used in the radiator in a separate route from that of the absorption chiller, or the cooling water that has flowed from the absorption chiller to the radiator is not returned to the absorption chiller. For example, it is desirable to adopt a method such as disposing of waste in the sea.

(F) Effects of the Invention As described above, the device of the present invention has the advantage that the length of the heat exchanger tubes of the heater through which the engine cooling water passes or the number of heat exchanger tubes of the heater through which the engine cooling water passes (the length of the heat exchanger tubes of the heater through which the engine cooling water passes) This allows the cross-sectional area of the heat transfer tube group to be adjusted according to the flow rate of engine cooling water supplied to the generator of the absorption chiller. Even if the flow rate of engine cooling water supplied to the generator of the absorption chiller is reduced due to a decrease in the flow rate of the engine cooling water, the flow velocity in the heat exchanger tube of the heater is prevented from decreasing too much, and turbulent flow inside the heat exchanger tube is prevented. This can prevent the heat transfer performance of the heater provided in the generator of the absorption refrigerator from deteriorating, and prevent the capacity of the absorption refrigerator from decreasing too much. Furthermore, since the device of the present invention is designed so that the temperature of the engine cooling water can be adjusted using a radiator, the engine cooling water maintained at a set temperature or lower can be returned to the engine.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing one embodiment of the device of the present invention, and FIG.
The figure is a partially enlarged schematic explanatory diagram of another embodiment of the device of the present invention. (1), (1)...engine, (2)...absorption refrigerator, (3)..., radiator, (4)...engine cooling water circuit, (5), (5' )...engine cooling water pump, (6)...generator, (17)...heater, a'n, (lrr...first and second heaters,
(2)...Heat recovery circuit, (Foundation)...Heat recovery bypass path, (2)...First and second heat recovery circuit,
(25)...Bypass path, (C)...Controller,
(S,)...load detector, (S,)...detector,
(V,), (V,)...first, second three-way valve, (V)
, (V)...Valve. Figure 1 Figure 2

Claims (1)

[Claims] (1) A plurality of engine cooling water heat recovery circuits are provided upstream of the radiator in the engine cooling water circuit that connects the engine and the radiator via the first three-way valve, and the same number of generator heaters as these heat recovery circuits are provided. The heater of the absorption chiller equipped with the heat recovery circuit is connected through an on-off valve, respectively, and the engine cooling water is radiated via a second three-way valve downstream of the first three-way valve of the engine cooling water circuit. When the amount of engine cooling water supplied to the generator decreases, the opening/closing valve is switched to reduce the number of heaters through which the engine cooling water flows, and engine cooling returns to the engine. A device that combines an engine and an absorption refrigerator, and includes a controller that controls a second three-way valve to increase the flow rate of engine cooling water to the radiator when the water temperature is higher than a set temperature.