JPH08246953A - Cooling water circuit device for co-generation system - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a cooling water circuit device of a co-generation system, and an object thereof is to improve thermal efficiency and simplify the structure. [Composition] In a cooling water circuit device of a co-generation system including an engine cooling water circuit and a heat recovery water circuit, heat recovery introduction of a heat recovery water circuit is provided downstream of a water pump provided in an engine cooling water introduction passage. The passage was connected, and the heat recovery outlet passage of the heat recovery water circuit was connected to the upstream side of the water pump provided in the engine cooling water introduction passage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a co-generation system (a system capable of supplying electric power and heat at the same time by combining an engine, a generator and a heat exchanger, for example, Japanese Utility Model Publication No. 3-100714). ing.)
The cooling water circuit device.

[0002]

2. Description of the Related Art Conventionally, as a cooling water circuit device of this type of co-generation system, those shown in FIGS. 3 and 4 are known. The cooling water circuit device
The engine A and the heat exchanger C are connected to the engine cooling water introduction passage 10
1 and the engine cooling water outlet passage 102, and the engine cooling water outlet passage 102 and the engine cooling water inlet passage 1
An engine cooling water circuit 106, which is connected to the engine cooling water bypass passage 103 at 01, is provided, the engine cooling water is cooled by the heat exchanger C, and the cooled engine cooling water is supplied to the engine A.

In the heat recovery water circuit 204, a water tank K,
The radiator M, the heat exchanger C, the heat recovery device E, the heat exchanger F, and the heat exchanger G are the heat recovery water introduction passage 201 and the heat recovery water derivation passage 2.
02, a water pump 3 for circulating the heat recovery water is provided in the heat recovery water introduction passage 201 of the heat recovery water circuit 204, and the heat recovery water is air-cooled by the radiator M according to the heating status in the system. Cools and dissipates heat.

Further, the exhaust manifold of the engine A is provided with a heat recovery device D, and the engine cooling water circuit 106 includes a heat recovery device D, a heat recovery water introduction passage 104 and a heat recovery water derivation passage 105 for heat recovery. A water circuit 107 is provided to guide the engine cooling water to the heat recovery device D through the heat recovery water introduction passage 104 branched from the engine cooling water introduction passage 101, and the heat energy of the exhaust gas of the engine A is transferred by the heat recovery device D. Collected.

The engine cooling water of the heat recovery device D is
The recovered water outlet passage 105 is joined to the engine cooling water outlet passage 102. Also, the hot water storage tank L
A hot water supply circuit 305 circulated from the water pump 4 is provided, and the heat recovered by the heat exchanger C, the heat recovery device D, and the heat recovery device E via the heat exchanger F, the hot water boiler H, and the hot water supply load device I. Energy is used for hot water supply.

Further, a heating water circuit 306 circulated by the water pump 5 is provided, and a heat exchanger C, a heat recovery device D, and a heat recovery device E are provided via a heat exchanger G, a heating loader J, and a hot water boiler H. The thermal energy recovered in step 1 is used for heating by opening / closing the switching valve 8.

[0007]

By the way, in the former cooling water circuit device shown in FIG. 3, the water temperature controller 6 for adjusting the temperature of the engine cooling water supplied to the heat exchanger C side cools the engine cooling water circuit 106. Since the water derivation passage 102 and the heat recovery water derivation passage 105 of the heat recovery water circuit 107 are provided on the downstream side where they merge, engine cooling water having different water temperatures are merged and mixed before the water temperature controller 6 and introduced. .

Therefore, it is difficult to adjust the water temperature by the water temperature controller 6, and therefore it is difficult to increase the temperature of the engine cooling water supplied to the heat exchanger C. If the water temperature of the engine cooling water supplied to the heat exchanger C is increased, the heat recovery efficiency is increased, but it is difficult to raise the water temperature of the engine cooling water, so that the heat recovery efficiency cannot be increased.

Further, in the cooling water circuit device, since the heat recovery water outlet passage 105 is connected to the upstream side of the water temperature controller 6, the inlet / outlet pressure difference of the heat recovery water circuit 107 is small and flows through the heat recovery device D. The flow rate of cooling water is low. Therefore, also from this point, the heat recovery efficiency could not be improved.
On the other hand, in the latter cooling water circuit device shown in FIG. 4, only the engine cooling water is supplied to the water temperature controller 6 and the water temperature controller 6
It becomes easy to control the water temperature by means of, and the engine cooling water can be supplied to the heat recovery device D by the independent water pump 2, and the amount of cooling water to the heat recovery device D can be increased. Therefore,
The heat recovery efficiency can be improved. However, the water pump 1 that circulates the engine cooling water circuit 106 and the water pump 2 that circulates the engine cooling water must be provided in the heat recovery water circuit 107, respectively, which complicates the structure and increases the cost.

An object of the present invention is to provide a cooling water circuit device of a cogeneration system, which can improve heat recovery efficiency, simplify the structure, and reduce the cost.

[0011]

According to a first aspect of the invention for achieving the above object, an engine and a heat exchanger are connected by an engine cooling water introduction and discharge passage, and an engine cooling water discharge passage and an engine cooling water are provided. When engine cooling water reaches a predetermined temperature or higher at a branch portion between the engine cooling water derivation passage and the engine cooling water bypass passage of the engine cooling water circuit in which the introduction passage is connected by the engine cooling water bypass passage A water temperature controller that opens the passage is provided, a water pump that circulates the engine cooling water is provided on the downstream side of the confluence of the engine cooling water bypass passage and the engine cooling water introduction passage, and a heat recovery device is provided in the engine cooling water circuit. In the cooling water circuit device of the co-generation system, which is connected to the heat recovery water circuit including the heat recovery water introduction and discharge passages, The heat recovery water introduction passage of the heat recovery water circuit is connected to the downstream side of the water pump provided in the engine cooling water introduction passage of the cooling water circuit, and the heat recovery water is provided to the upstream side of the water pump of the engine cooling water introduction passage. It is characterized in that the heat recovery water outlet passage of the circuit is connected.

According to a second aspect of the present invention, the engine and the heat exchanger are connected by an engine cooling water introduction and discharge passage, and the engine cooling water discharge passage and the engine cooling water introduction passage are connected by an engine cooling water bypass passage. A water temperature controller that opens the engine cooling water outlet passage when the engine cooling water reaches a predetermined temperature or higher is provided at a branch portion between the engine cooling water outlet passage and the engine cooling water bypass passage in the cooling water circuit. A water pump that circulates the engine cooling water is provided on the downstream side of the confluence of the bypass passage and the engine cooling water introduction passage, and the heat recovery water including the heat recovery device and its heat recovery water introduction and derivation passage is provided in the engine cooling water circuit. Facility water that is connected to the circuit and branches by a switching valve downstream of the water pump in the heat recovery water circuit when the engine cooling water temperature exceeds a specified temperature. In the cooling water circuit of co-generation system provided with a road to connect the heat recovery water introducing passage of the heat recovery water circuit at the downstream side of the water pump provided in the engine cooling water introduction passage of the engine coolant circuit,
The heat recovery water outlet passage is connected to an upstream side of the water pump in the engine cooling water inlet passage.

[0013]

According to the first and second aspects of the present invention, only the engine cooling water led out from the engine is introduced into the water temperature controller through the engine cooling water lead-out passage. Therefore,
It becomes easy to adjust the water temperature of the engine cooling water by the water temperature controller, so that the water temperature of the engine cooling water supplied to the heat recovery device is increased, and the high engine cooling water improves the heat recovery efficiency.

Further, according to the first and second aspects of the invention, the heat recovery water introducing passage of the heat recovery water circuit is connected to the downstream side of the water pump for circulating the engine cooling water, and the upstream side of the water pump is connected. Since the heat recovery water outlet passage of the heat recovery water circuit is connected, the pressure difference between the inlet and outlet of the heat recovery water circuit increases, the amount of engine cooling water flowing through the heat recovery device increases, and heat recovery efficiency also improves from this point. To be enhanced.

Further, according to the first and second aspects of the present invention, one water pump is used in common with the water pump for circulating the engine cooling water in the engine cooling water circuit.
The structure is simplified and the cost is reduced.

[0016]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, A is an engine, B is a generator, and C is a heat exchanger. The engine A and the heat exchanger C are connected by an engine cooling water introduction passage 101 and an engine cooling water discharge passage 102.

An engine cooling water bypass passage 103 is connected between the engine cooling water outlet passage 102 and the engine cooling water introducing passage 101 to form an engine cooling water circuit 106. In this embodiment, the engine cooling water circuit 106 is the same as that shown in FIG.

At a branch portion 12 between the engine cooling water outlet passage 102 and the engine cooling water bypass passage 103, a water temperature controller for opening the engine cooling water outlet passage 102 when the temperature of the engine cooling water exceeds a predetermined temperature. 6 is provided. A water pump 1 that circulates the engine cooling water is provided on the downstream side of the confluence portion 13 between the engine cooling water bypass passage 103 and the engine cooling water introducing passage 101.

The water temperature controller 6 operates at a predetermined temperature, and when the temperature is lower than a predetermined temperature, the engine cooling water is allowed to flow only to the engine cooling water bypass passage 103 side and not to the heat exchanger C. On the other hand, when the temperature of the engine cooling water becomes equal to or higher than the predetermined temperature, the water temperature regulator 6 opens the engine cooling water outlet passage 102 to allow the engine cooling water to flow to the heat exchanger C and not to the engine cooling water bypass passage 103. It is like this.

Further, in the engine cooling water circuit 106, a heat recovery water circuit 107 comprising a heat recovery device D and a heat recovery water introduction passage 104 and a heat recovery water derivation passage 105 of the heat recovery device D is provided.
Is connected. The heat recovery device D is provided in an exhaust manifold or the like through which the exhaust gas of the engine A flows.

Further, a heat recovery water introduction passage 104 of the heat recovery device D is connected to a downstream side of the water pump 1 provided in the engine cooling water introduction passage 101 of the engine cooling water circuit 106, and the engine cooling water introduction passage 101 is provided. The heat recovery water outlet passage 105 is connected to the upstream side of the water pump 1 provided in the.

The heat recovery water circuit 107 is provided separately from the engine cooling water circuit 106 so that the water temperature can be easily adjusted by the water temperature controller 6. F and G are heat exchangers for hot water supply and heating, and a water tank K, a heat exchanger C, a heat recovery device E and heat exchangers F and G are a heat recovery water introduction passage 201 and a heat recovery water derivation passage 202. Heat recovery water circuit 20 connected
4 are configured. A water pump 3 is provided in the heat recovery water introducing passage 201, and heat exchange water in the water tank K is circulated in the heat recovery water circuit 204.

Further, the heat recovery water introduction passage 2 to the heat recovery device E
The heat recovery water bypass passage 203 for connecting the heat recovery water derivation passage 202 to the heat recovery water derivation passage 202 is provided at 01 to balance the heat energy recovered heat with the consumed heat energy for hot water supply, heating load, etc. When the consumed heat energy is small, the flow-dividing valve 7 is used to change the passage area of the heat recovery water introduction passage 201 to the heat recovery device E to a small value according to the signal from the water temperature sensor to reduce the heat recovery water flow rate to the heat recovery device E. The recovered heat energy from the heat recovery device E is reduced by increasing the flow rate of the recovered heat water flowing to the recovered water bypass passage 203.

The heat exchanger F for hot water supply has a hot water boiler H,
The hot water supply loader I and the hot water storage tank L are connected by the hot water supply passage 301 and the hot water supply passage 302 to form a hot water supply circuit 305. The hot water supply circuit 305 includes a water pump 4
Is provided to circulate the hot water in the hot water storage tank L in the hot water supply circuit 305. J is a heating loader, and the heat recovery heat exchanger G, the hot water boiler H, and the heating loader J are connected by a facility water introducing passage 303 and a facility water outlet passage 304 to form a facility water circuit 306. . A water pump 5 is provided in the facility water circuit 306 to circulate hot water in the facility water circuit 306.

The heat energy recovered by the heat exchanger C and the heat recovery device E is finally used for hot water supply or heating. In the figure, N is a water temperature sensor for measuring the water temperature provided in the heat recovery water outlet passage 105, and 10 and 11 are water supply valves.

In this embodiment, the temperature of each cooling water circuit was measured. For example, when the temperature detected by the water temperature sensor N was 97 ° C., the temperature on the inlet side of the heat exchanger C was 95 (90). ℃, the temperature on the outlet side of the heat exchanger C is 90 (8
3) ° C., the temperature on the outlet side of engine A was 95 (88) ° C. In addition, the inside of () shows the case of the conventional apparatus of FIG.

That is, the engine cooling water at 97 ° C. after the heat energy is recovered by the heat recovery device D merges with the engine cooling water cooled by the heat exchanger C to cool the engine A (heat recovery) and then the engine outlet. 95 ℃ in part, 5 ℃ more than before
The high temperature engine cooling water having a high temperature is supplied to the heat exchanger C. Therefore, the water temperature of the engine cooling water supplied to the heat exchanger C is increased, and the heat recovery efficiency is increased. That is, conventionally, since the water temperature is limited by the outlet temperature of the heat recovery device D,
Although the loss of heat energy was large, the loss of heat energy was extremely small in this example.

Further, according to this embodiment, the inlet and outlet of the heat recovery water circuit 107 are provided upstream and downstream of the water pump 1 for circulating the engine cooling water.
The pressure difference between the inlet and outlet of the heat recovery water increases, and the flow rate of the cooling water flowing through the heat recovery water circuit 107 can be increased. From this point as well, the recovered heat amount can be increased, and the heat energy recovered by the heat recovery device D can be effectively used. Can be used for.

Further, the water pump 1 for circulating the engine cooling water has an engine cooling water circuit 106 and a heat recovery circuit 107.
Since the water pump that circulates the engine cooling water is common and can be operated by driving only one water pump 1, the structure is simplified. FIG. 2 shows an embodiment of a cooling water circuit device of a cogeneration system according to claim 2.

In this embodiment, the heat recovery water circuit 20 of the cooling water circuit device of the co-generation system shown in FIG. 1 is used.
Between the water pump 3 of 4 and the heat exchanger C, a facility water circuit 400 for circulating the cooling water to the radiator M by the switching valve 9 is provided. Below a predetermined temperature, the cooling water in the water tank K directly flows into the heat exchanger C and does not flow into the radiator M.

At a temperature equal to or higher than a predetermined temperature, the switching valve 9 operates and the cooling water flows to the heat exchanger C via the radiator M of the facility water circuit 400. At that time, heat is dissipated by the radiator M by an externally driven fan or the like. In this embodiment, the same effects as the cooling water circuit device of the co-generation system shown in FIG. 1 can be obtained, and since the radiator M is provided, the cooling water circuit of the co-generation system shown in FIG. Compared to the device, it has excellent heat dissipation characteristics.

[0033]

As described above, according to the first and second aspects of the present invention, the temperature of the engine cooling water supplied to the heat exchanger can be increased and the amount of water can be increased to improve the heat recovery efficiency. . Also, the water pump that circulates the engine cooling water in the engine cooling water circuit and the water pump that circulates the engine cooling water in the heat recovery water circuit are combined into one water pump, so the structure is simplified and the cost is reduced. It can be reduced.

Further, according to the second aspect of the invention, since the air-cooling cooling is performed by the radiator, there is an effect that heat is smoothly dissipated.

[Brief description of drawings]

FIG. 1 is a structural diagram of a cooling water circuit device of a cogeneration system showing an embodiment of claim 1.

FIG. 2 is a structural diagram of a cooling water circuit device of a cogeneration system showing an embodiment of claim 2;

FIG. 3 is a structural diagram of a cooling water circuit device of a conventional co-generation system.

FIG. 4 is a structural diagram of a cooling water circuit device of another conventional co-generation system.

[Explanation of symbols]

 1 water pump (for engine cooling) 2 water pump (for cooling exhaust manifold) 3 water pump (for heat recovery) 4 water pump (for hot water supply) 5 water pump (for heating) 6 water temperature controller 7 diversion valve (exhaust heat recovery) 8) Switching valve (for heating) 9 Switching valve (radiator) 10 Water supply valve (radiator) 11 Water supply valve (for hot water supply) 12 Branch part 13 Confluence part 101 Engine cooling water introduction passage 102 Engine cooling water discharge passage 103 Engine Cooling water bypass passage 104 Heat recovery water introduction passage 105 Heat recovery water discharge passage 106 Engine cooling water circuit 107 Heat recovery water circuit 201 Heat recovery water introduction passage 202 Heat recovery water discharge passage 203 Heat recovery water bypass passage 204 Heat recovery water circuit 301 Hot water supply passage (for hot water supply) 302 Hot water supply passage (for hot water supply) 303 Facility water introduction passage (for heating) 304 Facility water delivery passage ( 305 Hot water supply circuit (for hot water supply) 306 Facility water circuit (for heating) 400 Facility water circuit A Engine B Generator C Heat exchanger D Heat recovery unit F Heat exchanger (for hot water supply) G Heat exchanger (heating) H) Hot water boiler I Hot water supply loader J Heating loader K Water tank L Hot water storage tank M Radiator N Water temperature sensor

Claims (2)

[Claims] 1. An engine cooling water circuit in which an engine and a heat exchanger are connected by an engine cooling water introduction and discharge passage, and an engine cooling water discharge passage and an engine cooling water introduction passage are connected by an engine cooling water bypass passage. A water temperature controller is provided at the branch between the engine cooling water outlet passage and the engine cooling water bypass passage to open the engine cooling water outlet passage when the temperature of the engine cooling water rises above a certain temperature. A water pump that circulates engine cooling water is provided on the downstream side of the confluence with the water introduction passage,
The engine cooling water circuit is connected to a heat recovery water circuit consisting of a heat recovery device and a heat recovery water introduction and discharge passage.
In the cooling water circuit device of the generation system,
The heat recovery water introduction passage of the heat recovery water circuit is connected to the downstream side of the water pump provided in the engine cooling water introduction passage of the engine cooling water circuit, and the heat recovery is provided on the upstream side of the water pump of the engine cooling water introduction passage. A cooling device for a cogeneration system, characterized in that a heat recovery water outlet passage of a water circuit is connected. 2. An engine cooling water circuit in which an engine and a heat exchanger are connected by an engine cooling water introduction and discharge passage, and an engine cooling water discharge passage and an engine cooling water introduction passage are connected by an engine cooling water bypass passage. A water temperature controller is provided at the branch between the engine cooling water outlet passage and the engine cooling water bypass passage to open the engine cooling water outlet passage when the temperature of the engine cooling water rises above a certain temperature. A water pump that circulates engine cooling water is provided on the downstream side of the confluence with the water introduction passage,
The engine cooling water circuit is connected to a heat recovery water circuit consisting of a heat recovery device and a heat recovery water introduction and derivation passage, and when the engine cooling water temperature exceeds a predetermined temperature, a water pump for the heat recovery water circuit. In a cooling water circuit device of a co-generation system in which a facility water circuit branched by a switching valve is provided on the downstream side of the heat recovery water on the downstream side of a water pump provided in the engine cooling water introducing passage of the engine cooling water circuit. A heat recovery water introduction passage of the circuit is connected, and a heat recovery water outlet passage of the heat recovery water circuit is connected to an upstream side of a water pump of the engine introduction passage.