JPH0399142A - Regenerative gas engine cogeneration system - Google Patents

Abstract

PURPOSE:To accomplish the high efficiency of a heat storage type gas engine co-generation system by a method wherein the exhaust heat of a gas engine is stored in heat storage materials in which high polymer materials are cross- linked and the heat released from the heat storage materials is used as heat source for the operation of an absorption refrigerator. CONSTITUTION:The heat medium in a heat source course 15 is heated by a heat exchanger 16 installed in an exhaust heat recovery course 12 and used as heat source for driving an absorption refrigerator 14. In a heat storage vessel 17 cross-linking molecular heat storage materials are packed and the vessel 17 is included in the course 12 for exchanging heat with the exhaust gas from a gas engine 1 so that the vessel is installed in parallel with a cushion tank 13 by means of a heat storage course 18. When the heat load for space cooling is lower than the heat energy recovered in the course 12, that is, excess energy is obtained, the heat storage for the vessel 17 is carried out and when the load is larger on the contrary, the vessel is automatically controlled to release heat.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention uses a gas engine to drive a generator to generate electric power, and also utilizes the exhaust heat of the gas engine to supply hot water and
The present invention relates to a so-called regenerative gas engine cogeneration system that obtains a heat source for heating as well as a heat source for an absorption refrigerator.

[Prior Art] Fig. 2 shows a conventional gas engine cogeneration system.

In this figure, numeral 1 is a gas engine, 2 is a generator that is driven by the gas engine l to generate electricity, 3 is a fuel gas line, 4 is an air line, and 5 is a gas engine l.
6 is a cooling water heat exchanger attached to the cooling line 5, 7 is a hot water heat exchange line, and the heat medium circulating in this hot water heat exchange line 7 is the cooling water heat exchanger. The heat of the cooling water is absorbed by the vessel 6. 8 is a hot water storage tank that heats the heat medium (and water for hot water supply) in the heating system path 9 with the heat of the heat medium circulating in the hot water supply heat exchange system path 7.

10 is an exhaust gas line of the gas engine 1, 11 is an exhaust gas heat exchanger, 12 is an exhaust heat recovery line for recovering heat from the exhaust gas by the exhaust gas exchanger 11, and 13 is a cushion tank.

14 is an absorption refrigerator, and 15 is an absorption refrigerator.
It is heated by the heat exchanger l6 attached to the refrigerating machine 2 and becomes a heat source for driving the absorption refrigerator l4.

[Problems with the Prior Art] In the conventional system described above, the heat held in the cooling water of the gas engine 1 is used as a heat source for space heating (and hot water supply), and the heat held in the exhaust gas is used as a heat source for the absorption chiller. This makes it possible to use thermal energy without wasting it and save energy.

However, the drawback of the above system is that there is no problem when the loads of air conditioning, heating, and electric power are balanced at the designed values, but there is a problem when these are not balanced.

For example, in the case of air conditioning, the cooling load is large during the day and small at night. On the other hand, electric appliances such as electric lights and televisions are often used at night, so the electric power load is large at night, but small during the day. This tendency is noticeable in ordinary households and shops.

Therefore, in conventional systems, the hot water storage tank 8 is used for heating and hot water supply.
Surplus thermal energy is stored inside the tank 8, and when the load becomes large and there is a shortage of thermal energy, the heat stored in the hot water storage tank 8 is utilized.

However, in the case of an absorption refrigerator, the M source temperature needs to be 100 degrees or higher, and in reality there is no practical means to store heat at such a high temperature.

As a result, for absorption chillers, the gas engine l must be operated according to the load, and the output fluctuates depending on the operating status of the gas engine l, making it not only impossible to provide stable cooling, but also poor operational efficiency. There are drawbacks.

Further, in order to compensate for the above-mentioned drawbacks, conventional systems are equipped with an auxiliary heat source, but having such an auxiliary heat source causes an increase in equipment costs.

In the present invention, when there is surplus heat in the waste gas from the gas engine, this surplus heat is stored at a high temperature that can be used to operate the absorption chiller, thereby reducing the cooling load on the gas engine. The unique feature is that when the size increases, this stored heat is released to ensure and stabilize the operation of the refrigerator.

[A Thousand Steps to Solve the Problems] As a means for solving the above problems, the present invention proposes a heat storage type gas engine cogeneration system having the following configuration.

A regenerative gas engine cogeneration system configured to store exhaust heat from a gas engine in a heat storage material obtained by crosslinking polymeric materials, and use the heat released from this heat storage material as a heat source for operating an absorption chiller. .

In the above structure, the heat storage material obtained by cross-linking a polymeric material is formed by coating polyethylene with organosilane-modified polyethylene to form a composite shaped body, and from the organosilane-modified polyethylene of the composite molded body. In practice, these heat storage materials are filled in large numbers in a heat storage tank through which a heat transfer medium flows, and these heat storage materials are It is configured so that the material and the heat medium come into direct contact and exchange heat.

[Operation] The heat of several hundred degrees held by the exhaust gas of the gas engine is once absorbed and stored in the heat storage material. Also, the load on the absorption chiller is large. When a tendency toward a shortage of SS sources occurs, heat is immediately released from the heat storage material to cover the shortage.

[Example] FIG. 1 shows an example of the present invention. 1 is a gas engine, 2 is a generator that is driven by the gas engine 1 to generate electric power, 3 is a fuel gas line, 4 is an air line, 5 is a water-cooled cooling line for the gas engine 1, 6
is a cooling water heat exchanger attached to the cooling line 5, and 7 is a hot water supply heat exchange system line. absorb. 8 is a hot water storage tank that heats the heat medium (and water for hot water supply) in the heating system path 9 with the heat of the heat medium circulating in the hot water supply heat exchange system path 7.

10 is an exhaust gas line of the gas engine 1, 11 is an exhaust gas heat exchanger, 12 is an exhaust heat recovery line for recovering heat from the exhaust gas by the exhaust gas exchanger 11, and 13 is a cushion tank.

D4 is an absorption chiller, l5 is a heat source line for the absorption chiller al4, and the heat medium in this heat source line l5 is an exhaust heat recovery system l.
It is heated by the heat exchanger l6 attached to the refrigerating machine 2 and becomes a heat source for driving the absorption refrigerator l4.

17 is a heat storage tank according to the present invention, and this heat storage tank 17 is filled with a crosslinked polymer heat storage material.

This heat storage tank l7 is connected to a cushion tank l7 with respect to an exhaust heat recovery system l2 that exchanges heat with the exhaust gas of the gas engine 1.
3 and is installed using a heat storage system line l8.

The heat storage in the heat storage tank l7 is carried out when the cooling load is
This is done when the thermal energy recovered in step 2 is below, that is, when there is surplus energy, and on the other hand, it is automatically controlled to be released when the load is large.

[Effects of the present invention] As described above, the present invention incorporates a heat storage tank filled with a cross-linked polymer heat storage material in the exhaust heat recovery system, temporarily stores surplus thermal energy in this heat storage tank, and stores it as needed. The absorption chiller is now operated while releasing water.

As a result, the following effects can be expected.

a. Since the high heat energy possessed by the exhaust gas can be used without waste, even higher efficiency can be achieved in the heat storage type gas engine cogeneration system.

b. Polymer cross-linked heat storage materials are capable of storing heat of 100°C or more and releasing heat at a constant temperature. Therefore, they are ideal as a heat source for absorption chillers and can absorb this heat with high efficiency. It is possible to operate a type refrigerator and is easy to control.

C. In an absorption refrigerator, an auxiliary heat source is not required or can be made on a very small scale, and the equipment cost for the auxiliary heat source can be reduced.

d. Since the heat source of the absorption chiller can be obtained by directly contacting the heat storage material, the temperature response during heat radiation is extremely good.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of a regenerative gas engine cogeneration system according to the present invention, and FIG. 2 is an explanatory diagram of a conventional example. l ... Gas engine 2 ... Generator 3 ... Fuel gas line 4 ... Air line 5 ... Cooling line 6 ... Cooling water heat exchanger 7 ... Hot water heat exchange line 8 ... Hot water tank 9 ... Heating system line 10 ... Exhaust gas line 11 ... Exhaust gas exchanger 12 ... Exhaust heat recovery line L3 ... Cushion tank L4 ... Absorption refrigerator L5 - ... Heat source system path l6 ... Heat exchanger l7 ... Heat storage tank l8 ... Heat storage system path

Claims (1)

[Claims] A regenerative gas engine cogeneration system configured to store exhaust heat from a gas engine in a heat storage material obtained by crosslinking polymeric materials, and use the heat released from this heat storage material as a heat source for operating an absorption chiller. .