JPH06193998A - Regenerative gas engine cogeneration system - Google Patents

Abstract

PURPOSE:To provide a gas engine cogeneration system constantly capable of being effectively operated. CONSTITUTION:In the title regenerative gas engine cogeneration system, exhaust heat of a gas engine 1 is used as an operation heat source for a chemical heat pump 3 such as adsorption refrigerating machine, absorption refrigerating machine or the like so that cold heat obtained by operation of the chemical heat pump 3 is stored as ice in an ice storage tank 4 so as to enable the use of the cold heat stored in the tank 4 when the cold heat is necessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called gas engine cogeneration system for driving a generator by a gas engine to generate electric power and effectively utilizing exhaust heat of the gas engine. The present invention relates to a heat storage type gas engine cogeneration system that stores heat as ice and obtains high operating efficiency by this heat storage.

[0002]

2. Description of the Related Art A conventional gas engine cogeneration system (hereinafter referred to as "cogeneration") drives a generator with a gas engine, while utilizing exhaust gas from the gas engine and exhaust heat from an engine jacket to heat or hot water. Or by driving a chemical heat pump such as an adsorption refrigeration machine or an absorption refrigeration machine to save energy.

Such a cogeneration system is usually designed on the basis of the electric power and heat load during the daytime when the demand for electric power and heat is sufficient. Even if there is no problem during the daytime, at nighttime, etc. There was a problem that efficient operation as a cogeneration system could not be performed in the hours when there was little heat demand even though there was power demand.

For this reason, it is common to stop the cogeneration at night and rely on power purchase, but as a result, the operating time of the cogeneration is shortened, the amortization period becomes longer than other systems, and the cogeneration The reality is that there are many cases where new installations are forgotten.

[0005]

Therefore, for example, as described in Japanese Patent Application Laid-Open No. 3-99142, a thermal heat storage tank is added to a conventional cogenerator so that heat can be stored when it is not needed. A cogeneration system has been proposed. However, in the case of this system, since an expensive heat storage material and a heat storage tank are required in addition to the conventional system, the initial cost correspondingly increases considerably. In addition, due to the increase in the number of computer rooms and the like in recent years, in the era when cooling is desired even in winter, such a configuration for storing heat is not a good idea.

In order to solve the above problems, the present invention proposes a gas engine cogeneration system capable of storing heat by converting exhaust heat of a gas engine into cold heat. .

[0007]

That is, the feature of the present invention which meets the above-mentioned object is that exhaust heat of a gas engine is used as a heat source for operation of a chemical heat pump such as an adsorption refrigerator or an absorption refrigerator, A heat storage type gas engine cogeneration system is constructed in which cold heat obtained by driving a chemical heat pump is stored as ice in an ice heat storage tank and the cold heat stored in the ice heat storage tank can be used when the cold heat is required.

[0008]

According to the present invention, when the cogeneration is operated at night when there is an electric power load but no heat load, the adsorption type (absorption type) refrigerator is operated by the thermal energy, and the cold heat obtained by this refrigerator is Ice heat is stored and can be used during the daytime cold demand.

Therefore, the cogene can be efficiently operated throughout the day and night regardless of the heat load, and further energy saving can be achieved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a system diagram of a gas engine cogeneration system according to the present invention. The gas engine (1) is the center of the generator (2) on one side, and the adsorption or absorption refrigerator (3) on the other side. ) And the ice heat storage tank (4) are connected to each other. A refrigeration load (5) such as a cooling device (hereinafter referred to as a user side (5)) is connected to the outside of this system via an ice heat storage tank (4).

Although detailed illustration of each element of the system is omitted, the generator (2) is rotationally driven by the gas engine (1) as in the case of a normal cogeneration, and uses electric power of a predetermined voltage. It is possible to distribute power to the side.

On the other hand, the adsorption type refrigerator and the absorption type refrigerator (3)
As the ice storage tank (4) and the ice storage tank (4), known ones are applied. For example, the adsorption refrigerating machine (3) will be described. It is a well-known one having a condenser and an evaporator arranged around a plurality of adsorption towers containing adsorbents.

Further, the ice heat storage tank is one in which an ice making means is built in a container, and the water in the container is converted into ice by the cold heat supplied from the outside to store heat.

The engine jacket of the gas engine (1) and each adsorption tower of the adsorption refrigerator (3) are connected via a heat medium liquid circulation pipe (6), and the adsorption refrigerator is also connected. The evaporator of (3) and the ice heat storage tank (4) are connected by another heat medium liquid circulation pipe (7), and each operates as follows.

First, exhaust heat from the engine (1) is made to sequentially flow through each adsorption tower through the heat medium liquid circulation pipe (6), and each adsorbent is heated to about 85.degree. The regeneration process of desorbing the refrigerant from the adsorbent is repeated. A series of refrigeration cycles in the adsorption refrigerator (3) are realized by this regeneration step and the adsorption step which is repeated at the same time during this, and cold heat is output from the evaporator.

Further, brine flows in the heat medium liquid circulation pipe (7) connecting the evaporator and the ice heat storage tank (4), and the cold heat generated in the evaporator is the brine. It is carried to the ice heat storage tank (4) via the and the water in the ice tray is frozen.

Here, in order to freeze the water in the ice heat storage tank (4), the adsorption refrigerator (3) must naturally generate cold heat of 0 ° C. or lower. It is desirable to take measures to prevent the freezing of the refrigerant by using, for example, alcohol having a lower freezing point than water as the refrigerant of the adsorption refrigerator (3).

Thus, in the system according to the present invention, the exhaust heat of the gas engine (1) can be stored as ice, and as a result, the gas engine (1) can be operated even when there is no refrigeration load on the user side. You can drive and make full use of the cogeneration system.

During the system operation, when a refrigerating load is generated on the utilization side (5) due to the use of the cooling equipment, the ice heat storage tank (4) is cooled, or the adsorption refrigerator (3) is generated. The cold heat may be directly supplied to the utilization side (5), but more efficiently, the cold heat generated by the adsorption refrigerator (3) is
It is preferable to supply to the utilization side (5) via the ice heat storage tank (4). Regarding this, a circulation pipe (7) that connects the adsorption refrigerator (3) and the ice heat storage tank (4) and a circulation pipe (8) that connects the ice heat storage tank (4) and the use side, It can be easily implemented by appropriately installing a switching valve and a branch pipe.

Further, at this time, if the capacity control is performed by the heat storage amount, the cold heat having excellent followability to the load on the user side (5) can be generated while the refrigerator (3) is operated at full load. Will be output.

[0021]

As described above, the present invention utilizes the exhaust heat of the gas engine as a heat source for operating a chemical heat pump such as an adsorption refrigerator or an absorption refrigerator, and is obtained by driving the chemical heat pump. It is a heat storage type gas engine cogeneration system that stores cold heat as ice in the ice heat storage tank and can use the cold heat stored in the ice heat storage tank when cold heat is required. Since it is a system that can store heat as cold heat, its continuous operation is possible, and the economy of the entire system is improved.

Moreover, by utilizing the stored cold heat,
Almost half of the daytime load, which has a high heat demand, can be covered by the stored heat. Therefore, the capacity of the adsorption (absorption) refrigerator installed can be half that of the conventional one, and the equipment cost of the refrigerator can be reduced. .

In addition, if the capacity is controlled by the amount of stored heat when cold heat is required, the adsorption type refrigerator can always be efficiently operated at full load, while cold heat can be supplied with excellent followability to the load. Also, because it stores ice heat,
It is extremely convenient to use for industrial low temperature applications such as food processing and refrigeration.

Further, from the above, the present invention greatly contributes to the expansion of applications of the cogeneration system. In particular, if the system according to the present invention is used for a large-scale supermarket, a department store, a large-scale office building (computer building), industrial process cooling and heating, etc., the effect is remarkably exhibited.

[Brief description of drawings]

FIG. 1 is a system diagram of a heat storage type gas engine cogeneration system according to the present invention.

[Explanation of symbols]

(1) Gas engine (3) Chemical heat pump (adsorption refrigerator, absorption refrigerator) (4) Ice heat storage tank

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yasuo Yonezawa 1-5-10 Himesato Nishiyodogawa-ku, Osaka City Nishiyodo Air Conditioner Co., Ltd. (72) Inventor Masao Matsushita 1-5-10 Himesato Nishiyodogawa-ku, Osaka Nishiyodo Air Conditioner Co., Ltd. (72) Inventor Jun Morikawa 1-5-10 Himesato, Nishiyodogawa-ku, Osaka City Nishiyodo Air Conditioner Co., Ltd. (72) Inventor Akiyoshi Sakai 1-5-10 Himesato, Nishiyodogawa-ku, Osaka City Nishiyodo Air Conditioner Co., Ltd. (72) Inventor Masaka Hata 1-5-10 Himeri, Nishiyodogawa-ku, Osaka City Nishiyodo Air Conditioner Co., Ltd.

Claims (1)

[Claims] 1. The exhaust heat of a gas engine is used as a heat source for operating a chemical heat pump such as an adsorption refrigerator or an absorption refrigerator, and cold heat obtained by driving the chemical heat pump is stored as ice in an ice storage tank. However, the heat storage type gas engine cogeneration system is characterized in that the cold heat stored in the ice storage tank can be used when cold heat is required.