JPS63998Y2 - - Google Patents

Description

[Detailed Description of the Invention] The disclosed technology belongs to the technical field of effectively utilizing waste heat released from the cooling water and exhaust gas of an engine for a facility such as a private power generator for heating and cooling purposes.

Therefore, this invention is an absorption type refrigeration system in which the cooling water piping and exhaust gas piping of an engine such as a diesel engine installed in a facility such as a private power generation facility is connected to an evaporator to connect cold and hot water loads such as an air conditioner or a water heater. This relates to a device that attempts to recover engine waste heat by installing an intervening pipe as a heating drive source in a regenerator of an absorption chiller, etc., and in particular, a device that attempts to recover engine waste heat by intervening an engine exhaust gas pipe as a heating device for a regenerator of an absorption chiller. On the other hand, the engine cooling water piping is installed as a heat exchanger after the pressure pump in the circulation piping connected from the absorber of the absorption chiller to the regenerator, and in summer, the circulation system line is connected to the engine. This invention relates to an engine waste heat recovery device for facilities that can be directly connected to the load during winter.

As is well known, there are quite a number of facilities that are equipped with engines such as diesel engines for in-house power generation or as a power source for manufacturing processes. In order to recover engine waste heat, effective utilization devices are attached, such as air conditioners, hot water heaters, etc.

By the way, for example, in a cooling device, there is a principle that by using a solvent in which an absorbent having a vapor pressure lower than the vapor pressure of the refrigerant vapor is dissolved, the refrigerant is absorbed and dissolved into the solvent very smoothly. In line with this, so-called absorption refrigerators are widely used, for example, as seen in the inventions of JP-A No. 47-23715 and JP-A-52-9153. et al., water, ie, steam, is used as a refrigerant, and an aqueous solution of lithium bromide dissolved in water is used as a solvent.

Therefore, to recover the waste heat of the facility engine, the absorption chiller described above is used to effectively utilize the heat. For example, when a private power generation mode is shown in FIG. The cooling water piping 3 of the diesel engine 2 is circulated through the pump 4 to the regenerator of one absorption refrigerator 5 as a driving heat source, while the exhaust gas piping 6 of the diesel engine 2 is connected to the regenerator of one absorption refrigerator 5'. The regenerator is similarly installed as a driving heat source so that it is turned into cold gas and released into the atmosphere, and the hot water piping 8 provided in the air conditioner 7 as a cold and hot water load is connected to both absorption refrigerators 5 and 5 via a pump 9. ' are connected in series and circulated, and a cooling water pipe 10 passing through the absorber and condenser of both absorption refrigerators 5 and 5' is connected in series to a cooling tower 11 and circulated by a pump 12. There is.

However, since the seed recovery equipment is equipped with two absorption chillers 5 and 5', it has the disadvantage that not only the initial cost is extremely high but also the maintenance cost is considerable. ,
The installation of the two absorption refrigerators 5 and 5' has the disadvantage that the installation space becomes large.

In addition, since two absorption refrigerators 5 and 5' are installed, skill is required for heat management.

Another disadvantage was that it could not be used selectively and effectively in summer and winter.

The purpose of this invention was to take into account the problem of waste heat recovery from facility engines using absorption chillers based on the prior art technology, and to install only a single absorption chiller and use high-temperature exhaust gas as the drive heat source to intervene in the regenerator. The relatively low temperature cooling water piping can be connected to the heat exchanger installed in the piping from the absorber to the regenerator to provide preheating in the summer, and can be directly connected to the cold and hot water load in the winter, making it compact and low cost. It is an object of the present invention to provide an excellent engine waste heat recovery device for facilities that can reliably and effectively utilize waste heat.

The structure of this invention in accordance with the above purpose is that the facility engine is operated, and while the solvent from the absorber is being sent to the regenerator, the heated cooling water of the engine is heat exchanged in the summer, and the solvent is preheated and cooled. The water is cooled and returned to the engine to cool and circulate the engine, and the preheated solvent is heated and evaporated in the regenerator by the exhaust gas piping from the engine, and the solvent is circulated to the absorber. Then, the vapor refrigerant from the regenerator gets a condenser and exchanges heat with the load line in the evaporator, and the evaporated high-pressure refrigerant is absorbed into the low pressure of the absorber and absorbed into the solvent, while the circulating absorber cooling water is absorbed. In the above system, during winter, the engine cooling water is switched to the load side for direct heating heat exchange.

Next, one embodiment of this invention will be described below based on FIG. Note that the same parts as those in the embodiment shown in FIG. 1 will be described with the same reference numerals.

5'' is one absorption refrigerating machine, and a circulation pipe 16 with a heat exchanger 15 interposed between an absorber 13 using an aqueous lithium bromide solution as a solvent 12' and a regenerator 14 is used for heat exchange. A pump 17 is provided in front of the container 15.

The cooling water pipe 3 from the jacket of the diesel engine 2 directly connected to the generator 1 has a pump 4 and forms a circulation path connected to the heat exchanger 15. A heat exchange section 6' serving as a driving heat source for the exhaust gas piping 6 is interposed in the regenerator 14 midway to generate and concentrate water vapor 18 as a refrigerant.

The cooling water pipe 3 of the engine 2 can be switched to a branch pipe 3' having a pump 4' via a switching valve 19, and is directly connected to the air conditioner 7 as a cold/hot water load in winter.

Thus, from the regenerator 14, a pipe 21 supplies refrigerant water vapor 18 to a condenser 22 via a pump 20, and from the condenser 22 to an evaporator 23, a pipe 24 supplies condensed refrigerant water 18'. was made to send
In the evaporator 23, a circulation pipe 26 showers the refrigerant 18' from the air conditioner 7 to a heat exchange section 27 of the hot water pipe 8 via a pump 25.

A refrigerant suction pipe 28 is connected between the evaporator 23 and the absorber 13.

10 is a cooling pipe to which the absorber 13, condenser 22, cooling tower 11, and pump 12 are connected in series.

In the above configuration, when the cooling pipe 3 of the diesel engine 2 is switched to the summer side using the switching valve 19 and is operated, the solvent 12' of the absorber 13 is sent to the regenerator 14 via the circulation pipe 16 by the pump 17. However, the hot water in the engine cooling water pipe 3 is preheated by the heat exchanger 15, and the hot water is cooled and returned to the engine 2 to cope with engine heating.

Thus, the preheated solvent 1 sent to the regenerator 14
2' is heated by the high temperature of the heat exchange part 6' of the exhaust gas pipe 6, and the refrigerant aqueous solution 12' is evaporated and concentrated to become high-pressure refrigerant vapor 18. The solvent aqueous solution 12' is transferred to the absorber 1.
3, the refrigerant is showered, cooled by the cooling pipe 10, and the pressure is lowered, and the cycle of absorbing the high pressure refrigerant vapor 18 from the evaporator 23 and absorbing it into the solvent 12' is repeated.

Note that the exhaust gas is cooled and released into the atmosphere.

Then, the refrigerant vapor 18 concentrated in the regenerator 14
is fed to the condenser 22 by the pump 20, cooled by the cooling pipe 10 and condensed into refrigerant water 18', fed to the evaporator 23 by the pipe 24, circulated and sheared by the pump 25, and then connected to the hot water pipe of the air conditioner 7. The cold water is returned to the air conditioner 7, and the refrigerant water 18' is converted into high-pressure refrigerant vapor 1.
8 and is sucked into the low-pressure absorber 13 through the suction pipe 28, absorbed into the lithium bromide aqueous solution solvent 12', and cycled.

In this way, the waste heat of the diesel engine 2 during the summer is recovered and effectively used.

Also, in winter, the switching valve 19 switches the cooling water pipe 3 to 3', and the hot water of the engine cooling water is directly circulated and heat exchanged with the air conditioner 7 to be used for heating.

It goes without saying that the embodiment of this invention is not limited to the above-mentioned embodiment, and various embodiments may be employed, such as providing a reciprocating heat exchanger between the circulation pipe 16 between the absorber and the regenerator. It is possible.

Furthermore, it goes without saying that the facility engine is not limited to power generation, and can also be applied to other engines than diesel engines.

As mentioned above, according to this invention, in a waste heat recovery device in which the cooling water piping and exhaust gas piping of a facility engine are interposed in an absorption chiller, one exhaust gas piping is installed.
A heat exchanger is installed in the regenerator of the basic absorption chiller as a driving heat source, and in addition, the engine cooling water piping is connected via a switching valve, and in the summer, the heat exchanger is installed after the pump in the circulation piping from the absorber to the regenerator. By connecting it directly to the cold/hot water load in the winter, it is possible to basically preheat the solvent and evaporate and heat the refrigerant using one absorption chiller, which can be used in the summer and winter. Waste heat can be recovered and used effectively regardless of the situation, making the equipment more compact and occupying less space.
This has an excellent effect of making maintenance easier.

Since only one absorption refrigerator is required, initial, running, and maintenance costs, including related equipment, can be reduced.

Furthermore, since it is a single absorption refrigerating machine, heat management and control using the heat exchanger and intervening exhaust gas piping can be easily performed, and excellent effects such as preheating and heating design and control can be achieved.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of an engine waste heat recovery device based on the prior art, and FIG. 2 is an explanatory diagram of one embodiment of this invention. 2...Engine, 3,3'...Cooling water piping, 6
...Exhaust gas piping, 7...Cold/hot water load, 5''...Absorption chiller, 6'...Drive heat source, 14...Regenerator,
13...Absorber, 16...Circulation piping, 17...Pump, 15...Heat exchanger, 19...Switching valve.

Claims (1)

[Scope of utility model registration request] In an engine waste heat recovery system in which the cooling water piping and exhaust gas piping of the engine installed in the facility are connected as a driving heat source to an absorption chiller connected to a cold/hot water load, the exhaust gas piping of the engine is connected to one absorption chiller. A heat exchanger is installed intermediately as a driving heat source for the regenerator of the absorption chiller, and a heat exchanger is installed after the pump in the circulation piping provided between the absorber of the one absorption chiller and the regenerator. An engine waste heat recovery device for facilities, characterized in that the cooling water piping of the engine is connected to a switching valve that selectively connects the heat exchanger and the cold/hot water load in summer and winter, respectively.