JP2011058736A - Device for efficiently distributing exhaust heat recovery energy - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for efficiently distributing exhaust heat recovery energy, using exhaust heat for a boiler even in a heat utilizing part such as a bathtub and heating equipment, and structured to be compact and easy to manage maintenance. <P>SOLUTION: A hot-water supply main circulation conduit 43 is provided between a hot-water supply part 4 and boilers 1 and 2, a temperature-rise main circulation conduit 63 is provided between a temperature-rise using part 6 and the boiler, and an exhaust heat recovery means 7 is provided in an exhaust pipe of the boiler. An exhaust heat recovery circulation conduit 71 is provided between the exhaust heat recovery means and an exhaust heat recovery water tank 8, and a hot-water supply exhaust heat using circulation conduit 48 is provided between the hot-water supply part and the exhaust heat recovery water tank through a heat exchanging means 814. The hot-water supply part is structured to selectively use the exhaust heat of the boiler and the combustion heat of the boiler, and a temperature-rise exhaust heat using circulation conduit is provided, dividing on the way of the temperature-rise main circulation conduit, between the exhaust heat recovery water tank through the heat exchanging means. With this structure, the exhaust heat and the combustion heat of the boiler are selectively used for the temperature-rise using part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a circulating water heating system, and is used when heating circulating water in a hot water supply device for a currant or the like, a heating device such as a bathtub, a heating device (heating device) or the like.

    In this type of conventional circulating water heating system, as shown in FIG. 4, a hot water supply main circulation water channel 43 is provided between the hot water storage tank 41 of the hot water supply unit 4 and the boilers 1 and 2, and the bathtub 5 or the like or the heating 6 Between the boilers 1 and 2 and the boilers 1 and 2 are provided with the main circulation water passages 53 and 63 for heating (including heating), and exhaust heat is discharged to the exhaust pipes 3 (11 and 21) of the boilers 1 and 2 A recovery means 7 is installed, an exhaust heat recovery circulation water channel 71 is provided between the exhaust heat recovery means 7 and the exhaust heat recovery water tank 8, and a hot water use exhaust heat utilization circulation water channel 48 is provided in the hot water storage tank 41. Then, the circulating water flowing through this hot water use exhaust heat utilization circulation channel 48 can be exchanged with the hot water in the exhaust heat recovery water tank 8 through the heat exchanger 9, and the boilers 1, 2 are provided in the hot water storage tank 41. The exhaust heat and the combustion heat of the boilers 1 and 2 can be selectively used. In addition, 91 is a pump which sends the hot water of the said waste heat recovery water tank 8 to the said heat exchanger 9.

JP 2003-302100 A

  By the way, conventionally, the exhaust heat of the boilers 1 and 2 is used only for the hot water supply unit 4, but the inventor also uses the exhaust heat of the boiler for the temperature rising use units such as the bathtub 5 and the heating 6. I thought it was impossible.

  An object of the present invention is to provide an exhaust heat recovery energy high-efficiency distribution apparatus that can use the exhaust heat of a boiler for a temperature rise utilization unit such as a bathtub 5 and a heating 6 and that is compact and easy to maintain. is there.

In the exhaust heat recovery energy high-efficiency distribution apparatus according to the present invention, a boiler, an exhaust heat recovery water tank, a hot water supply unit, and a temperature rise utilization unit are provided, and a hot water supply main circulation channel is provided between the hot water supply unit and the boiler. In addition, a main circulation water passage for raising temperature is provided between the temperature raising utilization part and the boiler, and exhaust heat recovery means is installed in the exhaust pipe of the boiler and between the exhaust heat recovery means and the exhaust heat recovery water tank. An exhaust heat recovery circulation channel is installed in
A hot water use exhaust heat utilization circulation channel is provided between the hot water supply section and the exhaust heat recovery water tank via a heat exchange means, and the exhaust heat of the boiler and the combustion heat of the boiler are selectively supplied to the hot water supply section. Make it available,
And, branching in the middle of the temperature raising main circulation channel, installing a temperature raising waste heat utilization circulation channel through a heat exchange means between the exhaust heat recovery water tank, The exhaust heat of the boiler and the combustion heat of the boiler can be selectively used.

  In this case, a makeup water supply channel is installed in the hot water supply section, a makeup water waste heat utilization channel is provided between the makeup water supply channel and the exhaust heat recovery water tank via heat exchange means, It can also be heated by the exhaust heat of the boiler.

  Furthermore, in this case, the supplementary water in the exhaust heat utilization water channel for makeup water can be heated by exhaust heat preferentially over the circulating water in the exhaust heat utilization circulation channel for hot water supply.

  Further, the hot water exhaust heat utilization circulation channel and the temperature raising exhaust heat utilization circulation channel can be installed independently via the exhaust heat recovery water tank and the respective heat exchange means.

Further, as the hot water use exhaust heat utilization circulation channel, it is installed in the middle of the hot water supply main circulation channel,
As a heat exchange means for the hot water use exhaust heat utilization circulation channel, by passing a part of the hot water use waste heat utilization circulation channel into the exhaust heat recovery water tank, the circulation water of the hot water use waste heat utilization circulation channel and the water supply Heat exchange with the hot water in the heat recovery water tank is possible, and as the heat exchange means of the temperature rise exhaust heat utilization circulation channel, a part of the temperature rise exhaust heat utilization circulation channel is part of the heat recovery water tank Heat exchange is possible between the circulating water in the exhaust heat utilization circulation channel for heating and the warm water in the heat recovery water tank by passing it in, and as the heat exchange means of the exhaust heat utilization channel for makeup water, A supply water exhaust heat use channel is branched in the middle of the supply water supply channel, and a part of the supply water exhaust heat use channel is passed through the exhaust heat recovery water tank to pass the supply water. Heat exchange between make-up water in the exhaust heat utilization channel and warm water in the heat recovery water tank It is also possible to function.

Since the exhaust heat recovery energy high-efficiency distribution device according to the present invention is configured as described above, that is, it includes a boiler, an exhaust heat recovery water tank, a hot water supply unit, and a temperature rise utilization unit, and the hot water supply unit and the boiler A hot water supply main circulation channel and a temperature rise main circulation channel between the temperature rise utilization section and the boiler, and an exhaust heat recovery means is installed in the exhaust pipe of the boiler and the exhaust heat recovery An exhaust heat recovery circulation channel is provided between the means and the exhaust heat recovery water tank,
A hot water use exhaust heat utilization circulation channel is provided between the hot water supply section and the exhaust heat recovery water tank via a heat exchange means, and the exhaust heat of the boiler and the combustion heat of the boiler are selectively supplied to the hot water supply section. Make it available,
And, branching in the middle of the temperature raising main circulation channel, installing a temperature raising waste heat utilization circulation channel through a heat exchange means between the exhaust heat recovery water tank, Since the exhaust heat of the boiler and the combustion heat of the boiler can be selectively used, the circulating water to the temperature raising utilization part is a part of the temperature raising main circulation water channel when using the boiler waste heat. As a result, the apparatus itself can be made compact.

  Therefore, if this exhaust heat recovery energy high-efficiency distribution device is used, the exhaust heat of the boiler can be used even in the temperature rise utilization part such as a bathtub and heating, and the exhaust heat recovery energy is high in size and easy to maintain. An efficiency distribution device can be provided.

  In this case, a makeup water supply channel is installed in the hot water supply section, a makeup water waste heat utilization channel is provided between the makeup water supply channel and the exhaust heat recovery water tank via heat exchange means, If heating can be made possible by exhaust heat from the boiler, the supply water to the hot water supply section can be heated using the exhaust heat from the boiler, so the temperature of the stored water in the hot water supply section is unlikely to drop. The effective use of exhaust heat is further increased.

  Furthermore, in this case, if the makeup water in the waste heat utilization water channel for makeup water can be heated by exhaust heat preferentially over the circulation water in the waste heat utilization circulation channel for hot water supply, a larger scale of the waste water drain for hot water supply can be obtained. Since the operation time of the circulating water in the heat-utilizing circulation channel is reduced, it is easy to maintain and manage the apparatus itself.

    In addition, if the exhaust heat utilization circulation channel for hot water supply and the exhaust heat utilization circulation channel for temperature increase are installed independently via the heat recovery water tank and each heat exchange means, the heat exchange means Since the hot water in the heat recovery water tank circulates independently and in parallel, as a result of supplying hot water of a constant temperature to each heat exchange means, each circulated water is different from the case where each heat exchange means is circulated in series. The heat exchange function can be performed for each heat exchange means at a constant water temperature.

Further, as the hot water use exhaust heat utilization circulation channel, it is installed in the middle of the hot water supply main circulation channel,
As a heat exchange means for the hot water use exhaust heat utilization circulation channel, by passing a part of the hot water use waste heat utilization circulation channel into the exhaust heat recovery water tank, the circulation water of the hot water use waste heat utilization circulation channel and the water supply Heat exchange with the hot water in the heat recovery water tank is possible, and as the heat exchange means of the temperature rise exhaust heat utilization circulation channel, a part of the temperature rise exhaust heat utilization circulation channel is part of the heat recovery water tank Heat exchange is possible between the circulating water in the exhaust heat utilization circulation channel for heating and the warm water in the heat recovery water tank by passing it in, and as the heat exchange means of the exhaust heat utilization channel for makeup water, Branching into the makeup water supply channel to install the makeup water waste heat utilization channel, and passing a part of the makeup water waste heat utilization channel into the waste heat recovery water tank for the makeup water supply Heat exchange between make-up water in the exhaust heat utilization channel and warm water in the heat recovery water tank If Noh,
Only the circulating water in the exhaust heat recovery water channel for hot water supply, the circulating water in the exhaust heat utilization circulation channel for heating, and the makeup water in the exhaust heat utilization channel for makeup water are circulated in the exhaust heat recovery water tank to exchange heat with hot water. As a result, that is, unlike the conventional case where a separate heat exchanger is installed and the warm water is recirculated to the heat exchanger by the operation of the pump, each recirculated water that is recirculated is contained in the exhaust heat recovery water tank. Since there is no merging, the water temperature in this exhaust heat recovery water tank will fluctuate gently and there is no unevenness. As a result, the circulating water in the exhaust heat utilization circulation channel for hot water supply, the circulating water in the exhaust heat utilization circulation channel for heating, and the replenishment It is easy to raise the temperature to the temperature at which make-up water in the water waste heat utilization channel is needed.

  Therefore, it is only necessary to use one exhaust heat recovery water tank when using the exhaust heat of the boiler for the temperature rise utilization part such as a bathtub, heating, etc. other than the hot water supply part and the temperature rise of the makeup water to the hot water supply part. Since it is not necessary to install the required hot water feed pump (for returning hot water to the heat exchanger), the installation space may be smaller than the conventional plan and the installation cost can be reduced.

The exhaust heat recovery energy high-efficiency distribution apparatus according to the present invention includes a boiler, an exhaust heat recovery water tank, a hot water supply unit, and a temperature rise utilization unit. A hot water supply main circulation channel is provided between the hot water supply unit and the boiler, a temperature increase main circulation channel is provided between the temperature increase utilization unit and the boiler, and exhaust heat recovery means is provided in an exhaust pipe of the boiler. Install. An exhaust heat recovery circulation channel is provided between the exhaust heat recovery means and the exhaust heat recovery water tank.
A hot water use exhaust heat utilization circulation channel is provided between the hot water supply section and the exhaust heat recovery water tank via a heat exchange means, and the exhaust heat of the boiler and the combustion heat of the boiler are selectively supplied to the hot water supply section. Make it available. Branching in the middle of the temperature raising main circulation channel and installing a temperature raising waste heat utilization circulation channel through a heat exchange means between the exhaust heat recovery water tank and the boiler in the temperature raising utilization unit The exhaust heat of the boiler and the combustion heat of the boiler can be selectively used.
A makeup water supply path is installed in the hot water supply section. A hot water supply exhaust heat utilization circulation channel is provided between the makeup water supply channel and the exhaust heat recovery water tank via heat exchange means, so that the makeup water can be heated by the exhaust heat of the boiler.
The makeup water in the exhaust heat utilization water channel for makeup water can be heated by exhaust heat preferentially over the circulation water in the exhaust water utilization circulation channel for hot water supply.
The hot water exhaust heat utilization circulation channel and the temperature raising exhaust heat utilization circulation channel are installed independently via the exhaust heat recovery water tank and the respective heat exchange means.
The hot water supply exhaust heat utilization circulation channel is branched and installed in the middle of the hot water supply main circulation channel. As heat exchange means for the hot water exhaust heat utilization circulation channel, by passing a part of the hot water exhaust heat utilization circulation channel into the exhaust heat recovery water tank, the circulating water of the hot water exhaust heat utilization circulation channel and the water supply Heat exchange is possible with warm water in the heat recovery water tank. Further, as the heat exchange means for the temperature raising exhaust heat utilization circulation channel, by passing a part of the temperature rise waste heat utilization circulation channel into the exhaust heat recovery water tank, the temperature increase waste heat utilization circulation channel Heat exchange between the circulating water and the hot water in the heat recovery water tank. As the heat exchange means for the makeup water exhaust heat utilization channel, the makeup water exhaust heat utilization channel is installed by branching in the middle of the makeup water supply channel. Heat exchange is possible between the makeup water in the makeup heat exhaust water channel and the warm water in the heat recovery water tank by passing a part of the makeup water waste heat utilization channel into the waste heat collection water tank. And
The above configuration has the most main features.

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

  1 is a flow sheet diagram of a first embodiment of the circulating water heating system according to the present invention, FIG. 2 is a flow sheet diagram of the second embodiment, FIG. 3 is a flow sheet diagram of the third embodiment, and FIG. It is a flow sheet figure of the corresponding conventional example.

  In FIG. 1, S is an exhaust heat recovery energy high-efficiency distribution device, 1 is the first boiler of this device S, and 2 is the second boiler. 11 is an exhaust pipe of the first boiler 1, and 21 is an exhaust pipe of the second boiler 2. These exhaust pipes 11 and 21 are connected to the main exhaust pipe 3, and the respective combustion exhaust gases merge together and are discharged through the main exhaust pipe 3.

  4 is a hot water supply section and 41 is a hot water storage tank. A hot water supply main circulation channel 43 is installed between the hot water storage tank 41 and the first boiler 1 and the second boiler 2. The circulating water circulates between the hot water storage tank 41, the first boiler 1 and the second boiler 2 through the hot water supply main circulation channel 43 by the operation of the pump 44. When circulating, the first boiler 1 and the second boiler 2 are heated and heated, and the heated and heated circulating water heats the hot water in the hot water storage tank 41. 45 and 45 are hot water heaters such as currants, and hot water is supplied from the hot water tank 41. 46 and 46 are mixing valves, which mix hot water and water from the hot water from the hot water storage tank 41 and supply water from the curans 45, 45 and the like.

  Reference numeral 5 denotes a temperature raising means of the bathtub 51 or the like (corresponding to the “temperature raising utilization part” of the present invention), and 52 denotes the heat exchanger. Between this heat exchanger 52 and the first boiler 1, a main circulation water channel 53 for temperature rise is installed. The circulating water circulates between the heat exchanger (for the bathtub 51 and the like) 52 and the first boiler 1 by the operation of the pump 54 via the temperature raising main circulation water channel 53. When circulating, the heated temperature is raised by the first boiler 1, and the heated and heated circulating water exchanges heat with the bathtub water through the heat exchanger 52 to raise the temperature of the bathtub water. 55 is a circulation pump for bath water, 56 is a filter, and 57 is a hair remover.

  Reference numeral 6 denotes a heating means (corresponding to the “temperature raising utilization part” of the present invention). Between the heating means 6 and the second boiler 2, a heating main circulation channel (corresponding to the “heating main circulation channel” of the present invention) 63 is installed. The circulating water circulates between the heating means 6 and the second boiler 2 by the operation of the pump 64 through the heating main circulation channel 63. When circulating, the second boiler 2 is heated and heated, and the heated and heated circulating water is supplied to the heating means 6.

  Next, 7 is an exhaust heat recovery device (corresponding to “exhaust heat recovery means” of the present invention), which is installed in the main exhaust pipe 3. Reference numeral 8 denotes an exhaust heat recovery water tank in which water is stored. The water in the exhaust heat recovery water tank 8 circulates between the exhaust heat recovery device 7 and the exhaust heat recovery device 7 through the exhaust heat recovery circulation channel 71 by the operation of the pump 72. And when passing the exhaust heat recovery apparatus 7, it heats up and becomes warm water. Reference numeral 81 denotes a makeup water supply passage to the exhaust heat recovery water tank 8, the water storage tank 41 and the currant 45, and 82 denotes an overflow water drainage path. Further, 83 is a water level meter, 84 is a resistance temperature detector, and its operation will be described later.

  48 is a hot water use exhaust heat utilization circulation channel, which circulates between the hot water storage tank (hot water supply unit 4) 41 and the heat exchanger 9. In this heat exchanger 9, hot water in the exhaust heat recovery water tank 8 is circulated by the operation of the pump 91, and heat is exchanged with the circulating water flowing in the hot water use exhaust heat utilization circulation channel 48.

  The temperature measuring resistor 49 transmits a signal indicating that the temperature of the circulating water in the hot water supply main circulation channel 43 is not appropriate, and the temperature of the hot water in the exhaust heat recovery water tank 8 is a certain level or higher (for example, 65 ° C. or higher). When the resistance temperature detector 84 transmits the above signal, the E1 valve (switching three-way valve) is opened, and the circulating water flows through the hot water supply waste heat utilization circulation channel 48 and is heated by the heat exchanger 9 to It is supplied to a hot water storage tank (hot water supply section 4) 41.

  Reference numeral 814 denotes a heat exchanger, which is installed in the middle of a makeup water supply passage 811 for a water storage tank described later. The heat exchanger 814 circulates the hot water in the exhaust heat recovery water tank 8 by the operation of the pump 813, and exchanges heat with the make-up water flowing through the water tank make-up water supply path 811. The sensor of the hot water storage tank (hot water supply section 4) 41 does not transmit a full water signal, and the temperature of the hot water in the exhaust heat recovery water tank 8 is below a certain value (for example, less than 65 ° C.) (resistance temperature detector 84 Is measured) and the temperature of the makeup water (measured by the resistance temperature detector 812) is lower than the warm water in the exhaust heat recovery water tank 8, the F1 valve (switching three-way valve) is opened and the warm water (exhaust heat recovery water tank) is opened. 8) flows and the makeup water is heated via the heat exchanger 814 and supplied to the hot water storage tank (hot water supply section 4) 41. When the sensor of the hot water storage tank (hot water supply section 4) 41 transmits a signal indicating that the water is full, the F1 valve (switching three-way valve) is closed. Note that even when the sensor of the hot water storage tank (hot water supply unit 4) 41 does not transmit a signal indicating that the water is full, a signal indicating that the temperature of the hot water in the exhaust heat recovery water tank 8 is less than a certain value (for example, less than 65 ° C.) When the body 84 transmits, or when the temperature of the makeup water (measured by the resistance temperature detector 812) is higher than the temperature of the warm water in the exhaust heat recovery water tank 8 (measured by the resistance temperature detector 84), The F1 valve (switching three-way valve) is closed, and the hot water of the exhaust heat recovery water tank 8 does not flow into the heat exchanger 814.

    Reference numeral 58 denotes a temperature raising exhaust heat utilization circulation channel, which is installed in a bypass shape in the temperature elevation main circulation channel 53 via a C1 valve and a C2 valve. Reference numeral 581 denotes a heat exchanger, which is installed in the middle of the temperature raising exhaust heat utilization circulation channel 58. This heat exchanger 581 is connected in series with the heat exchanger 9 (of the hot water use exhaust heat utilization circulation channel), and the hot water in the exhaust heat recovery water tank 8 is circulated by the operation of the pump 91, so that the temperature rise exhaust heat is obtained. Heat exchange is performed with the circulating water flowing through the use circulation channel 58, and the temperature is raised.

  The temperature measuring resistor 59 transmits a signal indicating that the temperature of the circulating water in the temperature raising main circulation channel 53 is not suitable, and the temperature of the warm water in the exhaust heat recovery water tank 8 is a certain level or higher (for example, 65 ° C. or higher). When the resistance temperature detector 84 transmits the above signal, it passes through the C1 valve (manually switched two-way valve, normally open) and the C2 valve (manually switched two-way valve, normally open) to increase the temperature of the main circulation. The circulating water in the water channel 53 flows through the temperature raising waste heat utilization circulating water channel 58, is heated, and is supplied to the heat exchanger 52 of the bathtub 51 or the like. At this time, the C3 valve (switching two-way valve) is closed.

  When the resistance temperature detector 59 transmits a signal indicating that the temperature of the circulating water in the temperature raising main circulation channel 53 is an appropriate temperature, or the temperature of the warm water in the exhaust heat recovery water tank 8 is less than a certain value (for example, less than 65 ° C.) When the RTD 84 sends the signal, the C1 valve (manual switching two-way valve, normally open), C2 valve (manual switching two-way valve, normally open), C3 valve (switching two-way valve) The circulating water is circulated through the temperature raising exhaust heat utilization circulation channel 58 and the main circulation channel 53. In this case, the temperature measuring resistor 59 transmits a signal indicating that the temperature of the circulating water is appropriate, and a signal indicating that the temperature of the warm water in the exhaust heat recovery water tank 8 is equal to or higher than a certain value (for example, 65 ° C. or higher). When the resistance thermometer 84 transmits, the corresponding boiler 1 is in a fire extinguisher state.

  Reference numeral 582 denotes an escape circuit installed in parallel with the temperature raising exhaust heat utilization circulation channel 58, and is for adjusting the flow rate flowing through the temperature increase waste heat utilization circulation channel 58.

    68 is an exhaust heat utilization circulation channel for heating (corresponding to the “heating exhaust heat utilization circulation channel” of the present invention), and is installed in a bypass in the heating main circulation channel 63 via the D1 valve and the D2 valve. Has been. Reference numeral 681 denotes a heat exchanger, which is installed in the middle of the heating exhaust heat utilization circulation channel 68. The heat exchanger 681 is connected in series with the heat exchanger (exhaust heat utilization circulation channel for hot water supply) 9 and the heat exchanger (exhaust heat utilization circulation channel for heating) 581, and the exhaust is activated by a pump 91. Hot water in the heat recovery water tank 8 circulates, heat is exchanged with the circulating water flowing through the heating exhaust heat utilization circulating water channel 68, and the temperature is raised.

  The temperature measuring resistor 69 transmits a signal indicating that the temperature of the circulating water in the heating main circulation channel 63 is not appropriate, and the temperature of the warm water in the exhaust heat recovery water tank 8 is not less than a certain value (for example, 65 ° C. or more). When the resistance temperature detector 84 sends a signal, the D1 valve (switching two-way valve, normally open) and the D2 valve (switching two-way valve, normally open) are opened and the main circulation water channel 63 for heating is circulated. Water flows through the heating waste heat utilization circulation channel 68 and is heated and supplied as warm water for the heating 6. At this time, the D3 valve (switching two-way valve) is closed.

    When the resistance temperature detector 69 transmits a signal indicating that the temperature of the circulating water in the heating main circulation channel 63 is appropriate, or a signal indicating that the temperature of the warm water in the exhaust heat recovery water tank 8 is less than a certain value (less than 65 ° C.) When the resistance thermometer 84 transmits, the D1 valve (switching two-way valve, normally open), the D2 valve (switching two-way valve, normally open) and the D3 valve (switching two-way valve) are opened and circulated. The water is circulated through the exhaust heat utilization circulation channel 68 and the main circulation channel 63 for heating. In this case, the temperature measuring resistor 69 transmits a signal indicating that the temperature of the circulating water is appropriate, and a signal indicating that the temperature of the warm water in the exhaust heat recovery water tank 8 is equal to or higher than a certain value (for example, 65 ° C. or higher). When the resistance temperature detector 84 transmits, the corresponding boiler 2 is in a fire extinguisher state.

  Reference numeral 682 denotes an escape circuit installed in parallel with the heating exhaust heat utilization circulation water channel 68 for adjusting the flow rate flowing through the heating exhaust heat utilization circulation water channel 68.

  The heat exchangers 9,581,681 are connected in series, but if the temperature becomes lower than the circulating water to be heated during the flow, the heat exchangers do not pass through the heat exchanger. Return to the exhaust heat recovery water tank 8.

  If the C3 valve and the D3 valve also serve as a flow rate control valve, the temperature rising main circulation water channel 53 or the heating temperature cannot be handled by the temperature raising exhaust heat utilization circulation channel 58 or the heating exhaust heat utilization circulation channel 68. Since each circulating water in the main circulating water channel 63 can be released by the corresponding flow control valves (C3, D3), the system can be introduced and installed regardless of the pipe diameter of each circulating system.

  Further, in this embodiment, the exhaust pipe 11 of the first boiler 1 and the exhaust pipe of the second boiler 2 are connected to the main exhaust pipe 3 and the respective combustion exhaust gases are merged, so that the first boiler 1 is ignited. If not, by selecting the exhaust heat utilization circulation channels 48, 58, 68, 811 and flowing the circulation water, the exhaust heat of the first boiler 2 is used to make the main circulation channels 43, 53, 63 Circulating water can be selected and heated to raise the temperature. If the second boiler 2 is not ignited, the exhaust heat of the second boiler 2 is selected by selecting the bypass circulation passages 48, 58, 68, and 811 and flowing circulating water that does not reach the set temperature. The circulating water in the main circulation channels 43, 53, and 63 can be selectively heated to raise the temperature.

  Next, a second embodiment will be described with reference to FIG.

  In the second embodiment, heat exchange between the heat exchanger 9 in the hot water use exhaust heat utilization circulation channel 48, the temperature rise exhaust heat utilization circulation channel 58 and the heating exhaust heat utilization circulation channel 68 in the first embodiment is performed. A device 681 is installed in parallel. Pumps 91,582,682,813 are installed in the circulation channels 48, 58, 68, 811 to form independent circulation channels. For this reason, the circulating water can be made to flow through the circulating water channels 48, 58, 68, 811 simultaneously, but the circulating water can also be made to flow selectively with priority over any of the circulating water channels 48, 58, 68, 811.

  Next, a third embodiment will be described with reference to FIG.

  In this embodiment, the hot water supply waste heat utilization circulation channel 48 is installed in the form of a bypass through the B1 valve and the B2 valve in the middle of the hot water supply main circulation channel 43.

  Further, instead of the heat exchanger 9 as a heat exchanging means for the hot water exhaust heat utilization circulation channel 48, a part of the hot water exhaust heat utilization circulation channel 48 is passed through the exhaust heat recovery water tank 8. Heat exchange can be performed between the circulating water in the hot water use exhaust heat utilization circulation channel 48 and the hot water in the exhaust heat recovery water tank 8. When the hot water circulating water flows through the heat recovery water tank 8 through the hot water exhaust heat utilization circulating water channel 48 by the operation of the pump 44, the hot water circulating heat is exchanged with the hot water in the exhaust heat recovery water tank 8 to be heated and heated. , And returned to the hot water supply main circulation channel 43.

  The temperature measuring resistor 49 transmits a signal indicating that the temperature of the circulating water in the hot water supply main circulation channel 43 is not appropriate, and the temperature of the hot water in the exhaust heat recovery water tank 8 is not less than a certain value (for example, 65 ° C. or more). When the temperature measuring resistor 84 transmits a signal, the B1 valve (switching two-way valve) and the B2 valve (switching two-way valve) are opened, and the circulating water in the hot water supply main circulation channel 43 is used as the exhaust heat for hot water supply. It flows through the circulating water channel 48, is heated, and is supplied as hot water for the hot water supply 4. At this time, the B3 valve (switching two-way valve) is closed.

    When the resistance temperature detector 49 transmits a signal indicating that the temperature of the circulating water in the hot water supply main circulation channel 43 is appropriate, or the temperature of the warm water in the exhaust heat recovery water tank 8 is less than a certain value (for example, less than 65 ° C). When the temperature measuring resistor 84 transmits a signal, the B1 valve (switching two-way valve) and B2 valve (switching two-way valve) are closed, the B3 valve (switching two-way valve) is opened, and the hot water discharge Circulating water does not bypass the heat-utilizing circulation channel 48 and circulates in the main circulation channel 43. In this case, the temperature measuring resistor 49 transmits a signal indicating that the temperature of the circulating water is appropriate, and a signal indicating that the temperature of the warm water in the exhaust heat recovery water tank 8 is equal to or higher than a certain value (for example, 65 ° C. or higher). When the resistance thermometer 84 transmits, the corresponding boilers 1 and 2 are in a fire extinguisher state.

  Reference numeral 482 denotes an escape circuit installed in parallel with the hot water use exhaust heat utilization circulation channel 48 for adjusting the flow rate flowing through the hot water use exhaust heat utilization circulation channel 48.

  Further, the exhaust heat utilization circulation channel 68 for heating joins the exhaust heat utilization circulation channel 58 for heating and passes through the heat recovery water tank 8 as a composite passage part. That is, since the exhaust heat utilization circulation channel 68 for heating and the exhaust heat utilization circulation channel 58 for heating are installed in parallel to the passage portion in the heat recovery water tank 8, both circulation channels 58, In this embodiment, the circulating water is preferentially flowed over the heating exhaust heat utilization circulating water channel 68 in order to ensure the function of the system. Of course, the priority order can be reversed.

    811 is a replenishing water supply path for a water storage tank, which is branched in the middle of the replenishing water supply path 81 and connected in parallel to the hot water use waste heat utilization water path 48 via an A1 valve and an A2 valve. Therefore, when the A1 valve and the A2 valve are opened (the B1 valve and the B2 valve are closed), the circulating water in the water tank supply water supply path 811 flows through the heat recovery water tank 8. Heat is exchanged with the hot water in the exhaust heat recovery water tank 8 and the temperature is raised by heating, and then returned to the makeup water supply path 81.

The sensor of the hot water storage tank (hot water supply section 4) 41 does not transmit a full water signal, and the temperature of the hot water in the exhaust heat recovery water tank 8 is below a certain value (for example, less than 65 ° C.) (resistance temperature detector 84 Is measured) and the temperature of the makeup water (measured by the resistance temperature detector 812) is lower than the warm water in the exhaust heat recovery water tank 8, the A1 valve (switching two-way valve) and the A2 valve (switching two-way valve) Opened (B1 valve and B2 valve are closed), makeup water flows in the exhaust heat recovery water tank 8, heated by hot water (in the exhaust heat recovery water tank 8), and supplied to the hot water storage tank (hot water supply section 4) 41 Is done. When the sensor of the hot water storage tank (hot water supply section 4) 41 transmits a signal indicating that the water is full, the A1 valve (switching two-way valve) and the A2 valve (switching two-way valve) are closed. Note that even when the sensor of the hot water storage tank (hot water supply unit 4) 41 does not transmit a signal indicating that the water is full, a signal indicating that the temperature of the hot water in the exhaust heat recovery water tank 8 is less than a certain value (for example, less than 65 ° C) is a resistance temperature sensor. When the body 84 transmits, or when the temperature of the makeup water (measured by the resistance temperature detector 812) is higher than the temperature of the warm water in the exhaust heat recovery water tank 8 (measured by the resistance temperature detector 84), The A1 valve (switching two-way valve) and the A2 valve (switching three-way valve) are closed (B1 valve and B2 valve are open), and the makeup water does not flow through the exhaust heat recovery water tank 8.
At this time, the circulating water flows through the exhaust heat recovery water tank 8 in the hot water use exhaust heat utilization circulation channel 48, and the circulating water is heated by the exhaust heat.

  Further, in these embodiments, when the temperature of the hot water in the exhaust heat recovery water tank 8 is not less than a certain value (for example, 65 ° C. or more), the water supply tank supply water supply path 811 and the hot water supply exhaust heat utilization circulation water path 48 are provided. The group of the exhaust heat utilization circulation water channel 58 for heating and the exhaust heat utilization circulation water channel 68 for heating operate in parallel. Further, in this case, in the above group, the makeup water supply passage 811 for the water tank is given priority, and in the later-described group, the temperature raising exhaust heat utilization circulation passage 58 is given priority. Of course, the priority order can be reversed.

The present invention provides a waste heat recovery energy high-efficiency distribution apparatus that can use the exhaust heat of a boiler even in a temperature rise utilization part such as a bathtub and heating other than a hot water supply part, and is compact and easy to maintain. it can. When using the exhaust heat of the boiler for the temperature rise utilization part such as the bathtub, heating etc. other than the hot water supply part and the temperature rise of the makeup water to the hot water supply part, it is only necessary to use one waste heat recovery water tank and it is conventionally necessary Since it is not necessary to install the hot water feed pump (for returning the hot water to the heat exchanger), the installation space may be narrower than the conventional plan and the installation cost can be reduced. As a result, it can be used in a heating system for circulating water in a hot water supply section for a currant or the like, a temperature rise utilization section such as a bathtub, heating or the like.

FIG. 1 is a flow sheet diagram of a first embodiment of a circulating water heating system according to the present invention. FIG. 2 is a flowchart of the second embodiment. FIG. 3 is a flowchart of the third embodiment. FIG. 4 is a flow sheet diagram of a corresponding conventional example.

S ... Exhaust heat recovery energy high-efficiency distribution device 1 ... First boiler 2 ... Second boiler
11… Exhaust pipe of the first boiler
21 ... Exhaust pipe of second boiler 3 ... Main exhaust pipe 4 ... Hot water supply section
41… Hot water tank
43… Main circulation channel for hot water supply
44… Pump
45… Water heaters such as currants
46… Mixing valve 5… Bathtub
51… Bathtub etc.
52… heat exchanger
53… Main circulation channel for heating
54… Pump
55… Bath water circulation pump
56… Filter
57… Epilator
581… heat exchanger
582… Pump
48… Waste water use circulation channel for hot water supply
49… RTD
58… Waste heat utilization circulation channel for heating
59… Resistance thermometer 6… Heating (temperature rising utilization part)
63… Main circulation channel for heating (main circulation channel for heating)
64… Pump
68… Waste heat utilization circulation channel for heating
681… Heat exchanger
682… Pump
69… RTD 7… Waste heat recovery device (waste heat recovery means)
71… Waste heat recovery circulation channel
72… Pump 8… Heat recovery tank
81… makeup water supply path
811… Replenishment water supply channel for water storage tank
812… RTD 813… Pump
814… heat exchanger
82… Overflow water drainage channel
83… Water level indicator
84… RTD
91… Hot water pump

Claims (5)

A boiler, an exhaust heat recovery water tank, a hot water supply unit, and a temperature rise utilization unit; a hot water supply main circulation channel is provided between the hot water supply unit and the boiler; and the temperature rise between the temperature rise utilization unit and the boiler Providing a main circulation water channel, installing exhaust heat recovery means in the exhaust pipe of the boiler, and providing an exhaust heat recovery circulation water channel between the exhaust heat recovery means and the exhaust heat recovery water tank,
A hot water use exhaust heat utilization circulation channel is provided between the hot water supply section and the exhaust heat recovery water tank via a heat exchange means, and the exhaust heat of the boiler and the combustion heat of the boiler are selectively supplied to the hot water supply section. Make it available,
And, branching in the middle of the temperature raising main circulation channel, installing a temperature raising waste heat utilization circulation channel through a heat exchange means between the exhaust heat recovery water tank, An exhaust heat recovery energy high-efficiency distribution apparatus characterized in that the exhaust heat of the boiler and the combustion heat of the boiler can be selectively used. A replenishment water supply channel is installed in the hot water supply section, a replenishment water waste heat utilization water channel is provided between the replenishment water supply channel and the exhaust heat recovery water tank via heat exchange means, and the replenishment water is discharged from the boiler. 2. The exhaust heat recovery energy high-efficiency distribution apparatus according to claim 1, wherein the heat heat recovery energy distribution apparatus can be heated by heat. 3. The high amount of exhaust heat recovery energy according to claim 2, wherein the supplementary water in the exhaust heat utilization channel for makeup water can be heated by exhaust heat in preference to the circulating water in the exhaust heat utilization circulation channel for hot water supply. Efficiency distribution device. The hot water exhaust heat utilization circulation channel and the temperature raising exhaust heat utilization circulation channel are installed independently via the exhaust heat recovery water tank and respective heat exchange means. The exhaust heat recovery energy high efficiency distribution device according to claim 2 or claim 3. As the hot water use exhaust heat utilization circulation channel, it is installed in the middle of the hot water supply main circulation channel,
As a heat exchange means for the hot water use exhaust heat utilization circulation channel, by passing a part of the hot water use waste heat utilization circulation channel into the exhaust heat recovery water tank, the circulation water of the hot water use waste heat utilization circulation channel and the water supply Heat exchange with the hot water in the heat recovery water tank is possible, and as the heat exchange means of the temperature rise exhaust heat utilization circulation channel, a part of the temperature rise exhaust heat utilization circulation channel is part of the heat recovery water tank Heat exchange is possible between the circulating water in the exhaust heat utilization circulation channel for heating and the warm water in the heat recovery water tank by passing it in, and as the heat exchange means of the exhaust heat utilization channel for makeup water, Branching into the makeup water supply channel to install the makeup water waste heat utilization channel, and passing a part of the makeup water waste heat utilization channel into the waste heat recovery water tank for the makeup water supply Heat exchange between make-up water in the exhaust heat utilization channel and warm water in the heat recovery water tank Exhaust heat recovery energy and high efficiency distributor according to claim 3, characterized in that the capacity.

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