JP2002221372A - Heat supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat supply system, in which general energy efficiency can be improved. SOLUTION: The heat supply system comprises a generator 12 driven by combustion type prime mover T, heat-pump equipment HP driven by power generated by the generator 12 to supply hot heat to a heat demand part D1 on the heat-pump side, and waste-heat collecting equipment 13, which heat a heating medium L2 by exhaust gas E of the prime mover T, and the heated heating-medium L2 is supplied to the part D2. In the system, the heat-pump equipment HP collects heat from exhaust gas E, after it is supplied for heating the heating medium L2 in the equipment 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a generator driven by a combustion type prime mover and a heat pump device driven by electric power generated by the generator to supply heat to a heat pump side heat demand destination. The present invention also relates to a heat supply system provided with an exhaust heat recovery device that heats a heat medium with exhaust gas from the combustion type motor and supplies the heated heat medium to a heat-drain-side heat demand destination.

[0002]

2. Description of the Related Art Conventionally, in such a heat supply system,
Exhaust gas from a combustion type motor has been discarded after being supplied to a heating medium in an exhaust heat recovery device. Further, the heat pump device is configured to use atmospheric air or geothermal heat as a heat source.

[0003]

However, in the prior art, the exhaust gas of the combustion type motor is disposed of after being heated by the exhaust heat recovery device for heating the heat medium, and thus the energy retained in the exhaust gas is disposed. As a result, the efficiency of recovering exhaust heat from exhaust gas of the combustion type motor was low. In the past, atmospheric air and geothermal heat were used as heat sources for heat pump devices.
Since the heat pump device can increase the amount of heat as the temperature of the heat source is increased, conventionally, there is room for improvement in increasing the amount of heat by increasing the temperature of the heat source of the heat pump device. Therefore, conventionally, there is room for improvement in improving the efficiency of recovering exhaust heat from exhaust gas of a combustion type motor, increasing the amount of heat taken by the heat pump device, and improving the overall energy efficiency.

[0004] The present invention has been made in view of such circumstances, and an object thereof is to provide a heat supply system capable of improving overall energy efficiency.

[0005]

Means for Solving the Problems [Invention according to claim 1]
A characteristic configuration according to claim 1 is that the heat pump device is configured to collect heat from the exhaust gas after being subjected to heating of the heat medium in the exhaust heat recovery device. According to the characteristic configuration of the first aspect, the heat pump device collects the exhaust gas after being subjected to the heating of the heat medium in the exhaust heat recovery device (hereinafter, may be referred to as an exhaust gas after heating the heat medium). It heats and supplies heat to the heat pump side heat demand destination. That is, generally, the temperature of the exhaust gas after heating the heating medium is
Still higher than the temperature of atmospheric air or geothermal (for example, 100
~ 150 ° C).
By using the exhaust gas after heating the heating medium at a higher temperature than atmospheric air or geothermal as the heat source of the heat pump device, it is possible to increase the efficiency of recovering the exhaust heat. Thus, the amount of heat taken by the heat pump can be effectively increased. Therefore, by using the exhaust gas after heating the heat medium as a heat source of the heat pump device, the heat collection amount of the heat pump device can be increased, and
Exhaust heat recovery efficiency can be increased, and as a result, overall energy efficiency can be improved.

According to a second aspect of the present invention, an oxidizing catalyst is provided for oxidizing the exhaust gas after heating the heat medium to be collected by the heat pump device. . According to the characteristic configuration of claim 2,
The oxidation catalyst can oxidize the exhaust gas after heating the heating medium to be collected by the heat pump device. For example, the unburned fuel contained in the exhaust gas after heating the heating medium can be burned. And the like can be suppressed from adhering to a heat pump device (specifically, a heat exchanger that exchanges heat between exhaust gas and a refrigerant after heating the heat medium in the heat pump device). It is possible to reduce maintenance work related to the removal of extraneous matter such as. Further, since the exhaust gas after heating the heat medium to be collected by the heat pump device is heated by the reaction heat generated by the oxidation reaction by the oxidation catalyst, the amount of heat collected by the heat pump device is increased, and the overall energy efficiency is further improved. be able to. Therefore, the maintenance work can be reduced and the total energy efficiency can be further improved.

According to a third aspect of the present invention, the heat pump device is configured to collect heat from the exhaust gas after heating the heat medium and to use a heat source different from the exhaust gas after the heat medium heating. And selectively performing heat collection. According to the characteristic configuration of the third aspect, the heat pump device is configured to perform the following two steps: the heat extraction from the exhaust gas after heating the heat medium, and the heat extraction from a heat source different from the exhaust gas after the heat medium heating.
Since it is configured to selectively perform heat collection of the species, it is possible to selectively perform the heat collection of the larger amount of heat among the two types of heat collection, or to perform the heat collection of both. By operating the heat pump device in the form described above, the amount of heat taken by the heat pump device can be increased. Therefore, the amount of heat taken by the heat pump device can be increased, so that the overall energy efficiency can be further improved.

According to a fourth aspect of the present invention, the heat demand side of the heat pump and the heat demand side of the exhaust heat side are the same heat demand side. According to the characteristic configuration of the fourth aspect, the heat obtained by the heat pump device and the heat obtained by collecting the exhaust heat by the exhaust heat recovery device are supplied to the same heat demand destination. . Therefore, since the heat obtained by the heat pump device and the heat obtained by collecting the exhaust heat are supplied to the same heat demand destination, it is possible to efficiently supply the heat to the heat demand destination. Now you can.

According to a fifth aspect of the present invention, at least one of the heat pump side heat demand destination and the exhaust heat side heat demand destination uses warm heat for snow melting. It is composed. That is, in such a heat supply system, conventionally, as described above, as the heat source of the heat pump device, atmospheric air, geothermal, or the like has been used. However, when the heat supply system is used for snow melting, Since the temperature is low when needed, the temperature of atmospheric air and geothermal heat used as a heat source for the heat pump device is low. Becomes lower. Therefore, the present invention is applied to a heat supply system for snow melting, and the exhaust gas after heating the heat medium is used as a heat source of the heat pump device. Can effectively increase the temperature of the heat collection source, effectively increase the heat collection amount of the heat pump device, and further improve the overall energy efficiency. Therefore, by adopting the present invention in the heat supply system for snow melting, the effect of improving the overall energy efficiency can be further remarkable, which is preferable.

According to a sixth aspect of the present invention, the combustion engine is a gas turbine. That is, the temperature of the exhaust heat of the gas turbine is higher than the temperature of the exhaust heat of the engine which is another example of the combustion type prime mover. Therefore, by adopting the present invention in a heat supply system provided with a gas turbine as a combustion type prime mover, the heat source of the heat pump device is compared with a case where the present invention is employed in a heat supply system having an engine provided as a combustion type prime mover. That is, since the temperature of the exhaust gas increases after the heating of the heating medium, the heat collection efficiency of the heat pump device can be increased, and the heat collection amount of the heat pump device can be increased. Accordingly, the amount of heat taken by the heat pump device can be increased, and the overall energy efficiency can be further improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A first embodiment in which the present invention is applied to a snow melting heat supply system will be described below with reference to the drawings. As shown in FIG. 1, the heat supply system includes a gas turbine 1 as a combustion type prime mover T.
1, a heat pump device HP driven by electric power generated by the generator 12 to supply heat to the heat pump side heat demand destination D1, and exhaust gas E from the gas turbine 11. The apparatus is provided with an exhaust heat recovery device 13 that heats the heat side heat medium L2 and supplies the heated exhaust heat side heat medium L2 to the heat exhaust side heat demand destination D2. In the present invention, the heat pump device HP collects heat from the exhaust gas E of the gas turbine 11 (that is, the exhaust gas after heating the heat medium) after the exhaust heat recovery device 13 is used to heat the exhaust heat side heat medium L2. It is configured as follows.

The exhaust heat recovery device 13 is configured to flow through the exhaust heat side heat medium L2 to be heated and to heat the exhaust heat side heat medium L2 with the exhaust gas E of the gas turbine 11. A gas supply path 18 is connected to the gas turbine 11.
As the gas turbine 11, for example, a so-called micro gas turbine that does not require lubricating oil can be used.

The output line of the generator 12 is connected to a distribution board 19, and the output power from the generator 12 is supplied to the distribution board 1.
9 to a power load in the heat supply system including the heat pump device HP. The generator 12
Is connected to the commercial power supply 21 by the interconnection device 20, and when the operation of the generator 12 is stopped for maintenance or the like, the driving power is supplied from the commercial power supply 21 to the power load in the heat supply system. It is configured as follows.

A heat-exchange-side snow-melting heat exchanger 15 for supplying heat to the heat-exhaust-side heat demand destination D2 is provided. The exhaust heat side heat medium L2 heated by the exhaust gas E in the exhaust heat recovery unit 13 is configured to circulate the exhaust heat side heat medium L2 through the side heat medium circulation path 16, and the heat exchanger for the heat exhaust side snow melting. 15. Reference numeral 17 in the figure denotes a heat-removal-side heat medium circulation path 1
6, a pump for circulating the exhaust heat side heat medium L2 through 6,
The pump 17 is also connected to the distribution board 19 and the generator 12
Driven by electric power from

As will be described later in detail, in the first embodiment, the heat pump device HP is caused to function as a refrigerant evaporator and to function as an exhaust gas heat exchanger 1 for collecting heat from a heat source and a refrigerant condenser. In addition, a heat supply heat exchanger 2 for supplying heat collected by the exhaust gas heat exchanger 1 to the heat pump side heat demand destination D1 is provided.

The exhaust gas heat exchanger 1 is provided in the exhaust gas passage 25 for guiding the exhaust gas E after heating the heat medium discharged from the exhaust heat recovery unit 13. And heat exchange with the exhaust gas E after heating the heat medium, and heat is collected from the exhaust gas E after heating the heat medium.

An oxidation treatment section 26 provided with an oxidation catalyst so as to allow gas to pass therethrough is provided at a portion of the exhaust gas passage 25 upstream of the heat exchanger 1 for exhaust gas. The exhaust gas E is oxidized by heating 26 after heating the heat medium flowing through the exhaust gas passage 25. The oxidation processing unit 26 may be configured, for example, by filling a ceramic ball carrying an oxidation catalyst into a casing so that gas can pass therethrough, or a honeycomb body carrying an oxidation catalyst may be filled with a gas inside the casing. It can be configured such that it can pass through. Incidentally, as the oxidation catalyst, for example, platinum or platinum rhodium can be used.

The heat supply heat exchanger 2 is connected to a heat pump-side snow melting heat exchanger 22 for supplying heat to the heat pump-side heat demand destination D1 via a heat pump-side heat medium circulation path 24 to the heat supply-side heat exchanger 2. The heat pump side heat medium L1 is circulated between the heat supply side heat exchanger 2 and the heat pump side snow melting heat exchanger 22 through the heat pump side heat medium circulation path 24, and the collected heat is used as the heat pump side snow melting heat exchanger. 22. 23 in the figure is a heat pump side heat medium L1 through a heat pump side heat medium circulation path 24.
The pump 23 is also used for the distribution board 1
9 and is driven by electric power from the generator 12.

The heat pump device HP will be described. The heat pump device HP is provided with a compressor 3 and an expansion valve 4 in addition to the exhaust gas heat exchanger 1 and the heat supply heat exchanger 2 described above, and these are used as main constituent devices for a heat pump circuit (refrigeration circuit). Is formed.

In the heat pump circuit, the refrigerant R is circulated in the order of the compressor 3, the heat exchanger for supplying heat, the expansion valve 4, and the exhaust gas heat exchanger 1, and the refrigerant circulation circulates the exhaust gas heat exchanger 1. It functions as a refrigerant evaporator and the heat supply heat exchanger 2 functions as a refrigerant condenser, whereby the heat is heated from the exhaust gas E after heating the heat medium and sent to the heat pump side snow melting heat exchanger 22. Heat pump side heating medium L
1 is heated to output heat to the load side, and the heat is used to melt snow.

Heat pump side heat medium L1, waste heat side heat medium L2
, Various heat medium liquids such as water and brine can be used.

As described above, the heat supply system for snow melting is constituted, and the heat pump side snow melting heat exchanger 22 and the exhaust heat side snow melting heat exchanger 15 are installed at the snow melting target area corresponding to the heat demand destination. The heat pump-side snow-melting heat exchanger 22 melts the snow using the heat collected by the heat pump device HP as a heat source, and the exhaust heat-side snow melting heat exchanger 15 uses the exhaust heat of the gas turbine 11 as a heat source. It is configured to melt snow. That is, the heat pump side heat demand destination D1 and the exhaust heat side heat demand destination D2 are configured to be the same heat demand destination.

[Second Embodiment] Hereinafter, based on FIG.
A second embodiment of the present invention will be described. However, the same components and components having the same operations as those of the first embodiment are denoted by the same reference numerals to avoid redundant description, and description thereof will be omitted. A configuration different from the first embodiment will be described.

The second embodiment has the same configuration as the first embodiment except that the configuration of the heat pump device HP is different. That is, in the second embodiment,
In addition to the exhaust gas heat exchanger 1, the heat source-side heat transfer fluid L3 and the refrigerant R are heat-exchanged to act as a refrigerant evaporator to collect heat from the heat collection source. A liquid heat exchanger 5 for collecting heat from the exhaust gas heat exchanger 1 is provided in the heat pump circuit in a state of being connected in parallel with the exhaust gas heat exchanger 1. The heat source side heat medium liquid L3 is circulated between the liquid heat exchanger 5 and an underground heat exchanger (not shown) to collect geothermal heat.

The refrigerant R flows into the exhaust gas heat exchanger 1 only, the liquid heat exchanger 5 flows only, and the refrigerant R flows into both the exhaust gas heat exchanger 1 and the liquid heat exchanger 5 into three states. A first on-off valve V1 and a second on-off valve V2 for switching the refrigerant path are provided.

The first on-off valve V1 and the second on-off valve V
2, the refrigerant R is caused to flow only to the exhaust gas heat exchanger 1, the exhaust gas heat source operation for collecting heat from the exhaust gas E after heating the heating medium, the refrigerant R is caused to flow only to the liquid heat exchanger 5, The liquid heat source operation in which heat is taken from the heat source side heat medium liquid L3, the refrigerant R flows through both the exhaust gas heat exchanger 1 and the liquid heat exchanger 5, and after the heat medium heating, the exhaust gas E and the heat source side heat medium liquid L3 It is configured to selectively perform the two heat source operation of collecting heat from both. The operation of the exhaust gas heat source, the operation of the liquid heat source, and the operation of the two heat sources are manually or automatically selected and performed according to the situation.

[Another Embodiment] Next, another embodiment will be described. (A) In the above embodiment, as a configuration for oxidizing the exhaust gas E after heating the heat medium to be collected by the heat pump device HP, an oxidation treatment unit provided with an oxidation catalyst so that gas can pass therethrough. Although the case where 26 is provided in the exhaust gas passage 25 has been exemplified, such an oxidation treatment section 26 may be omitted and the oxidation catalyst may be carried on the heat transfer surface of the heat exchanger 1 for exhaust gas.

(B) In providing the heat exchanger 5 for heat recovery in addition to the heat exchanger 1 for exhaust gas for heat collection in the heat pump device HP, in the second embodiment described above, the heat exchanger 1 for exhaust gas is used. The case where the liquid heat exchanger 5 is provided in the heat pump circuit in a state of being connected in parallel has been described as an example, but the exhaust gas heat exchanger 1 and the liquid heat exchanger 5 are provided in the heat pump circuit in a state of being connected in series. Is also good.
Also in this case, similarly to the second embodiment, the exhaust gas heat source operation, the liquid heat source operation, and the two heat source operation are selectively performed.

(C) In the second embodiment,
Although the case where the geothermal heat is collected in the liquid heat exchanger 5 has been described as an example, instead of this, for example, the heat source side heat medium liquid L3 may be replaced with the liquid heat exchanger 5 and the sewage heat exchanger ( (Not shown), and heat may be collected from sewage. Alternatively, natural water, such as river water, lake water, ground water, or spring water, is passed directly to the liquid heat exchanger 5 as the heat source side heat transfer fluid L3, so that river water, lake water, ground water, spring water, etc. You may comprise so that it may collect heat.

(D) The combustion type prime mover T for driving the generator 12 is not limited to the gas turbine 11 exemplified in the above embodiment, and may be, for example, a gas engine or a gasoline engine.

(E) The heat demand at the heat pump side heat demand destination D1 is not limited to the snow melting exemplified in the above embodiment, but includes heating, freezing prevention, hot water supply, etc.
Applicable to various demands. In addition, the exhaust heat side heat demand destination D2
Is not limited to the snow melting exemplified in the above embodiment, but can be applied to various demands such as heating, prevention of freezing, and hot water supply. Note that the present invention is not limited to the case where the heat pump-side heat demand destination D1 and the exhaust heat-side heat demand destination D2 are configured to be the same heat demand destination. Demand destination D2
And may be different.

When applying the heat demand of the heat pump side heat demand destination D1 to hot water supply, water from a water supply source such as tap water is supplied to the heat supply heat exchanger 2 in the heat pump apparatus HP as the heat pump side heat medium L1. Then, it is configured to heat and supply hot water to a hot water supply destination such as a hot water tap. Further, when applying the heat demand of the exhaust heat side heat demand destination D2 to the hot water supply, the water from the water supply source is flown to the exhaust heat recovery device 13 as the exhaust heat side heat medium L2 to be heated and supplied to the hot water supply destination. It is constituted so that.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a heat supply system according to a first embodiment.

FIG. 2 is a configuration diagram of a heat supply system according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Gas turbine 12 Generator 13 Exhaust heat recovery device D1 Heat pump side heat demand destination D2 Exhaust heat side heat demand destination E Exhaust gas L2 Heat medium HP Heat pump device T Combustion motor

Claims (6)

[Claims] 1. A generator driven by a combustion type prime mover, a heat pump device driven by electric power generated by the generator to supply heat to a heat pump side heat demand destination, and the combustion type prime mover An exhaust heat recovery device that heats the heat medium with the exhaust gas of (1) and supplies the heated heat medium to the exhaust heat side heat demand destination, wherein the heat pump device is provided in the exhaust heat recovery device. A heat supply system configured to collect heat from the exhaust gas after being subjected to heating of the heat medium. 2. The heat supply system according to claim 1, further comprising an oxidation catalyst for oxidizing the exhaust gas to be heated by the heat pump device. 3. The heat supply according to claim 1, wherein the heat pump device is configured to selectively perform heat collection from the exhaust gas and heat collection from a heat source different from the exhaust gas. system. 4. The heat supply system according to claim 1, wherein the heat pump-side heat demand destination and the exhaust heat-side heat demand destination are the same heat demand destination. 5. The apparatus according to claim 1, wherein at least one of the heat pump-side heat demand destination and the exhaust heat-side heat demand destination is configured to use warm heat for melting snow.
A heat supply system according to the item. 6. The heat supply system according to claim 1, wherein the combustion type prime mover is a gas turbine.