JP5475425B2 - Hot water generator - Google Patents

Description

  The present invention relates to a hot water generator, and more particularly to a hot water generator including a latent heat recovery heat exchanger that recovers the latent heat of exhaust gas from a burner.

  Conventionally, in a hot water generator used for a water heater or the like, in order to improve fuel efficiency, not only does the burner burn in the combustion chamber and the heat of combustion heats the heat transfer water and secondary hot water, There has been a method of preheating heat transfer water and secondary hot water using heat of exhaust gas generated after burning the burner.

  For example, in order to effectively use the heat of combustion exhaust gas discharged from boilers, etc., a heat exchanger for recovering latent heat that absorbs not only sensible heat of combustion exhaust gas but also latent heat to increase the amount of heat absorption (Economizer) has been proposed (see, for example, Patent Document 1).

  When a conventional hot water generator using such a heat exchanger for recovering latent heat is used for hot water supply in a facility such as a public bath, the configuration shown in FIG. 4 is often adopted.

  As shown in FIG. 4, the conventional hot water generator includes a combustion chamber 120 provided with a burner 110 and can accommodate a heat transfer water 200, and is accommodated in the hot water generator main body 100. The primary side circulation path 300 that circulates the heat transfer water 200, the secondary side circulation path 400 that circulates the secondary hot water 500 in the currant 410 provided for hot water supply, and the primary side circulation path 300 are circulated. The heat (sensible heat) of the exhaust gas 130 generated by the combustion of the indirect heat exchanger 600 that exchanges heat between the high-temperature heat transfer water 200 and the low-temperature secondary hot water 500 that circulates in the secondary-side circulation path 400 and the burner 110. , Latent heat recovery heat exchanger 700 for recovering latent heat). In the figure, the reference numeral 310 indicates a heat medium circulation pump provided in the primary side circulation path 300, the reference numeral 420 indicates a circulation pump provided in the secondary side circulation path 400, and a reference numeral 800. Shown is a flue that is communicatively coupled to the combustion chamber 120 via a latent heat recovery heat exchanger 700.

  The hot water generator configured as described above burns fuel such as gas and oil in the combustion chamber 120 by the burner 110 and heats the heat transfer water 200 accommodated in the hot water generator main body 100 by the combustion heat. Then, the high-temperature heat medium water 200 is circulated to the primary-side circulation path 300 by the heat-medium circulation pump 310, and similarly, the low-temperature secondary hot water 500 is circulated to the secondary-side circulation path 400 by the circulation pump 420. The secondary hot water 500 circulating through the secondary side circulation path 400 is heated by exchanging heat with the indirect heat exchanger 600.

  Further, as shown in the figure, the secondary hot water 500 circulating in the secondary side circulation path 400 is heat-exchanged with the latent heat recovery heat exchanger 700 before being supplied to the indirect heat exchanger 600 and heated. Is preheated. That is, in the conventional hot water generator, the latent heat recovery heat exchanger 700 is used to preheat the secondary hot water 500 circulating in the secondary side circulation path 400.

  In addition, the hot water generator shown in FIG. 4 includes not only hot water supply but also a plurality of primary side circulation paths 300 and a plurality of indirect heat exchangers 600 and a plurality of secondary side circulation paths 400 corresponding thereto, for example, , Heating, circulation heating and the like can be performed simultaneously.

JP 11-248105 A

  As shown in FIG. 4, in the conventional system using the latent heat recovery heat exchanger 700 for preheating the secondary hot water 500 circulating in the secondary side circulation path 400, In the hot water supply pipe for business used in the above-mentioned public baths and the like, it is desirable that the secondary hot water 500 having a predetermined temperature can be always supplied, and therefore the secondary hot water 500 is always circulated in the secondary side circulation path 400.

  For this reason, when the usage frequency of the secondary hot water 500 supplied from the currant 410 decreases, the temperature of the secondary hot water 500 circulating in the secondary side circulation path 400 rises more than necessary, and heat exchange for latent heat recovery is performed. The hot secondary hot water 500 enters the vessel 700. In general, when the temperature of the secondary hot water 500 entering the latent heat recovery heat exchanger 700 becomes high, moisture condensation in the exhaust gas 130 is less likely to occur due to the characteristics of the latent heat recovery heat exchanger 700, resulting in latent heat recovery. The heat exchange efficiency in the industrial heat exchanger 700 is reduced.

  Further, in the hot water generator for hot water supply, the amount and temperature of the secondary hot water 500 entering the latent heat recovery heat exchanger 700 vary depending on the opening / closing frequency of the currant 410, that is, the hot water supply frequency. The efficiency of heat exchange in the latent heat recovery heat exchanger 700 also varies. Furthermore, since the capacity of the latent heat recovery heat exchanger 700 depends on the amount and temperature of the secondary hot water 500 circulating in the secondary side circulation path 400, for example, when the amount of the secondary hot water 500 circulating is small or circulating When the start / stop control of the pump 420 is performed, if the heat transfer is not sufficient, there is a risk that the inside of the latent heat recovery heat exchanger 700 is overheated or the pressure rises due to the heat of the exhaust gas 130.

  Therefore, as shown in FIG. 4, hot water generation is provided with a plurality of circuits that simultaneously perform hot water supply, heating, circulation heating, etc., constituted by a primary side circulation path, an indirect heat exchanger, and a secondary side circulation path In order to obtain a machine, conditions for controlling the flow rate of the secondary hot water 500 circulating through the secondary side circulation path 400 connected to the latent heat recovery heat exchanger 700 and the operation of the circulation pump 420 are set for each of a plurality of circuits. It has been necessary to prevent the occurrence of a decrease in heat exchange efficiency, an overheated state, and a pressure increase in the latent heat recovery heat exchanger 700 described above.

  This invention solves the said subject, and provides a warm water generator which comprises the heat exchanger 700 for latent heat collection | recovery with a simple structure and high safety | security without setting conditions for every some circuit. It is aimed.

  In the present invention, the following means have been taken in order to solve the above problems.

(1) and hot water generator body housing the heat medium water, a combustion chamber for heating the heat transfer water of the hot water generator body, said in order to discharge the exhaust gas discharged from the combustion chamber to the outside flue that external distraction combustion chamber, the combustion chamber and the flue and the connecting portions disposed in the latent heat recovery heat exchanger, the hot water generator 1 Ru is circulated heat transfer water in the body following and the side circulation path is constructed independently of the said primary circulation path, and the secondary side circulation path for circulating the secondary hot water for hot water supply from Curran, the heat medium water circulating the primary side circulation path An indirect heat exchanger for exchanging heat with the secondary hot water circulating through the secondary side circulation path, and connecting the start end of the primary side circulation path to the upper part of the hot water generator main body. The indirect heat exchanger is interposed in the middle of the secondary side circulation path and the middle of the secondary side circulation path, and extends from the indirect heat exchanger. The primary side circulation path is connected to one end of the latent heat recovery heat exchanger, and the other end of the latent heat recovery heat exchanger is connected to the hot water generator main body. In the indirect heat exchanger, heat transfer water circulating in the primary side circulation path in a state where the temperature is lowered by exchanging heat with the secondary hot water circulating in the secondary side circulation path in the indirect heat exchanger, A hot water generator, wherein the latent heat recovery heat exchanger provided on the downstream side of the indirect heat exchanger is preheated and circulated in the hot water generator body .

  (2) In the warm water generator of (1) above, second indirect heat exchange for exchanging heat between the heat transfer water circulating through the primary circuit and the secondary hot water circulating through the secondary circuit. An apparatus is provided on the upstream side of the latent heat recovery heat exchanger.

(3) In the hot water generator of (1) or (2) above, the combustion chamber before exhaust gas passes through the latent heat recovery heat exchanger, and the exhaust gas passes through the latent heat recovery heat exchanger. communicating between said flue after, Rutotomoni a bypass exhaust gas discharged from the combustion chamber Ru is derived in the flue without passing through the latent heat recovery heat exchanger, the bypass It is characterized in that the flow rate of the exhaust gas passing through the bypass can be adjusted by the flow rate adjusting means provided in the middle .

  According to the present invention, since the temperature of the heat transfer water supplied to the latent heat recovery heat exchanger can be made relatively low, it is possible to prevent overheating and pressure increase of the latent heat recovery heat exchanger. Therefore, it can be set as the warm water generator which comprises the heat exchanger for latent heat recovery with high safety. Moreover, it can be set as the warm water generator which can connect a some circuit (hot water supply, heating, circulation heating, etc.), without setting a severe circuit condition.

It is a schematic block diagram which shows the warm water generator of one Embodiment of this invention. It is a schematic block diagram which shows the warm water generator of one Embodiment of this invention. It is a schematic block diagram which shows the warm water generator of one Embodiment of this invention. It is a schematic block diagram which shows the conventional warm water generator.

(First embodiment)
Hereinafter, the hot water generator according to the first embodiment of the present invention will be specifically described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a hot water generator 10 according to the first embodiment of the present invention.

  In addition, although the hot water generator 10 in 1st Embodiment can be used conveniently for hot water supply, heating, etc. in a building, a factory, or a public bath facility, for example, what kind of place is required if hot water supply or heating is required? It can be installed at a place.

  As shown in FIG. 1, a hot water generator 10 according to the first embodiment includes a combustion chamber 13 provided with a burner device 12, and a hot water generator main body 11 that can accommodate heat transfer water, and hot water generation. A primary-side circulation path 20 that circulates the heat transfer water accommodated in the machine body 11 and the primary-side circulation path 20 are configured independently, and a plurality of outlet terminals provided for hot water supply. The secondary side circulation path 30 that circulates the secondary hot water discharged from each of the currants 32, the high-temperature heat transfer water that circulates through the primary side circulation path 20, and the secondary side circulation path 30 are provided. An indirect heat exchanger 50 that performs heat exchange with the low-temperature secondary hot water that is performed, and a latent heat recovery heat exchanger 40 that recovers the heat (sensible heat, latent heat) of the exhaust gas generated by the combustion of the burner device 12. It has. That is, the secondary hot water discharged from the currant 32 is a high-temperature heat transfer water that circulates water supplied from the water source (not shown) to the secondary side circulation path 30 through the primary side circulation path 20. Heat is exchanged by the indirect heat exchanger 50 and heated.

  In the first embodiment, as illustrated, a plurality of primary side circulation paths 20, a plurality of indirect heat exchangers 50, and a plurality of secondary side circulation paths 30 are provided. And a circuit is constituted by a set of primary side circulation path 20, indirect heat exchanger 50, and secondary side circulation path 30, for example, a plurality of circuits (for example, hot water supply circuit, Heating circuit etc.). In addition, in the following description, the hot water supply circuit by the secondary side circulation path 30 provided with the set of primary side circulation path 20, the indirect heat exchanger 50, and the currant 32 is demonstrated.

  A combustion chamber 13 is provided in the hot water generator main body 11, and a burner device 12 is attached to one end side of the combustion chamber 13 so that the burner port faces the combustion chamber 13, while a combustion chamber is provided on the other end side. The base end of the flue 15 extended to the outside of 13 is connected in communication. And the heat transfer water accommodated in the hot water generator main body 11 is heated by the combustion heat which the predetermined fuel (gas, oil, etc.) in the combustion chamber 13 burned with the burner apparatus 12.

  In the hot water generator 10 according to the first embodiment, the latent heat recovery heat exchanger 40 is disposed at the connection portion between the combustion chamber 13 and the flue 15, that is, the latent heat recovery heat exchanger 40 is: The heat transfer water circulating in the primary side circulation path 20 is exchanged with the exhaust gas after burning a predetermined fuel (gas, oil, etc.) in the combustion chamber 13 to circulate in the primary side circulation path 20. It preheats the heat transfer water.

  Note that the latent heat recovery heat exchanger 40 and the indirect heat exchanger 50 that perform the heat exchange of the heat transfer medium described above are well known and will not be described. As a result of heat exchange performed using the latent heat recovery heat exchanger 40, moisture in the exhaust gas is condensed and acidic drain is generated. Generally, the latent heat recovery heat exchanger 40 is neutralized. A device (not shown) is attached, and the acidic drain is discharged to the outside of the hot water generator 10 after being treated by the neutralization device.

  The primary side circulation path 20 is provided with a primary side circulation pump 21 that circulates the heat medium inside the hot water generator main body 11. By this primary side circulation pump 21, a relatively high temperature heat transfer water accommodated in the upper part of the hot water generator main body 11 is supplied to the indirect heat exchanger 50, and the heat transfer water and the secondary side circulation path 30 are supplied. Heat exchange with the circulating secondary hot water can be performed.

  The heat transfer water circulating through the primary side circulation pump 21 is exchanged with the secondary hot water in the indirect heat exchanger 50 and then discharged from the indirect heat exchanger 50 to the primary side circulation path 20 and flows downward. To do. Further, a check valve 22 is disposed in the primary side circulation path 20 downstream of the indirect heat exchanger 50, and the heat transfer water after heat exchange in the indirect heat exchanger 50 is the indirect heat exchanger 50. Prevents backflow in.

  The heat transfer water that passes through the check valve 22 and circulates in the primary circulation path 20 is supplied to the latent heat recovery heat exchanger 40 via the water collection path 23, and in the latent heat recovery heat exchanger 40. The exhaust gas generated in the combustion chamber 13 is preheated by exchanging heat, and then discharged from the latent heat recovery heat exchanger 40 and returned to the hot water generator main body 11 from a substantially central portion of the hot water generator main body 11. .

  On the other hand, the secondary side circulation path 30 is provided with a secondary side circulation pump 31 for circulating the secondary hot water. The secondary hot water circulated in the secondary side circulation path 30 by the secondary side circulation pump 31 is supplied to the indirect heat exchanger 50 and exchanges heat with the heat transfer water circulating in the primary side circulation path 20 and then indirectly. It is discharged from the heat exchanger 50. The secondary hot water heated by the indirect heat exchanger 50 is supplied with hot water from a currant 32 disposed in the secondary side circulation path 30.

  Further, the secondary side circulation path 30 is provided with a water supply port (not shown) for replenishing secondary hot water supplied from the currant 32, and always has a predetermined amount of water in the secondary side circulation path 30. Secondary hot water is circulated.

  As described above, in the first embodiment, the relatively high temperature heat transfer water heated in the combustion chamber of the hot water generator main body 11 is circulated through the primary side circulation path 20 to the indirect heat exchanger 50. On the other hand, secondary water having a relatively low temperature is supplied to the indirect heat exchanger 50 through the secondary side circulation path 30 that is piped independently of the primary side circulation path 20 by supplying water or the like. Thus, heat is exchanged between the high-temperature heat transfer water circulating in the primary side circulation path 20 and the secondary hot water circulating in the secondary side circulation path 30 to heat the secondary hot water.

  Then, the heat transfer water of the primary side circulation path 20, whose temperature has been reduced by exchanging heat with the secondary hot water in the secondary side circulation path 30, exchanges heat with the exhaust gas in the latent heat recovery heat exchanger 40. Preheated. As described above, the hot water generator 10 according to the first embodiment uses a so-called primary side circulation system in which the heat exchanger water 40 for latent heat recovery is used to preheat the heat transfer medium circulating in the primary side circulation path 20. It is configured as.

  In the primary side circulation system described above, the heat transfer water having a reduced temperature circulating through the primary side circulation path 20 is supplied to the latent heat recovery heat exchanger 40 and is preheated by exchanging heat with the exhaust gas. Since it is returned to the hot water generator main body 11 later, the fuel consumption of the fuel burned by the burner device 12 can be improved, and the environmentally friendly hot water generator such as the reduction of carbon dioxide in the exhaust gas discharged and the prevention of the greenhouse effect. 10 can be used.

  Further, since the heat transfer water circulating through the primary side circulation path 20 exchanges heat in the indirect heat exchanger 50 and is supplied to the latent heat recovery heat exchanger 40 in a state where the temperature is lowered, Water can be provided to the latent heat recovery heat exchanger 40 to prevent the inside of the latent heat recovery heat exchanger 40 from being overheated by the high-temperature exhaust gas, so that efficient heat exchange is always performed for the latent heat recovery. It is possible to carry out with the heat exchanger 40.

  Further, if the currant 32 is not used and the secondary hot water in the secondary side circulation path 30 circulates in a high temperature state and sufficient heat exchange is not performed in the indirect heat exchanger 50, the primary side circulation path. The heat transfer water circulating through 20 is also provided to the latent heat recovery heat exchanger 40 in a high temperature state, but in this case as well, the warm water generator 10 has a pressureless open structure or a vacuum structure. The heat transfer water passing through the recovery heat exchanger 40 has a high safety because it does not physically exceed 100 ° C. and a pressure increase cannot occur physically.

  In the first embodiment, since the heat transfer water accommodated in the hot water generator main body 11 is not directly supplied to the outside, replenishment may be a small amount corresponding to evaporation, etc. Even if the heat transfer water is little replaced and repeatedly supplied to the inside of the latent heat recovery heat exchanger 40, it is possible to prevent a decrease in heat transfer efficiency due to adhesion of a scale or the like inside the latent heat recovery heat exchanger 40. is there.

(Second Embodiment)
Here, the hot water generator according to the second embodiment of the present invention will be specifically described with reference to the drawings. FIG. 2 is a schematic diagram showing a hot water generator 10 ′ according to a second embodiment of the present invention. Note that, in the following second embodiment, the same reference numerals are given for the sake of easy understanding except for the portions different from the first embodiment described above, and the description is omitted.

  As shown in FIG. 2, a hot water generator 10 ′ according to the second embodiment includes a combustion chamber 13 provided with a burner device 12, and a hot water generator main body 11 capable of accommodating heat transfer water, The primary-side circulation path 20 that circulates the heat transfer water accommodated in the generator body 11 and the primary-side circulation path 20 are configured independently of each other and are outlet terminals provided for hot water supply. A secondary-side circulation path 30 that includes a plurality of currants 32 and circulates secondary hot water discharged from each of the currants 32, a high-temperature heat transfer water that circulates in the primary-side circulation path 20, and a secondary-side circulation path 30 Heat of the exhaust gas generated by the combustion of the indirect heat exchanger 50 and the second indirect heat exchanger (hereinafter referred to as sub heat exchanger 60) that exchange heat with the circulating low-temperature secondary hot water and the burner device 12. A latent heat recovery heat exchanger 40 for recovering (sensible heat, latent heat); It is provided. Similarly to the first embodiment, the secondary hot water discharged from the currant 32 circulates the water supplied from the water source (not shown) to the secondary side circulation path 30 through the primary side circulation path 20. Heat is exchanged with the high-temperature heat transfer medium to be heated by the indirect heat exchanger 50 and the sub heat exchanger 60 and heated.

  In the second embodiment, as in the first embodiment described above, a plurality of primary circulation paths 20, a plurality of indirect heat exchangers 50, and a plurality of sub heat exchangers 60 are provided, and correspondingly. A plurality of secondary-side circulation paths 30 are provided. And a circuit is comprised by one set of the primary side circulation path 20, the indirect heat exchanger 50, the sub heat exchanger 60, and the secondary side circulation path 30, for example, the several circuit from which the objective for hot water supply or heating differs (For example, a hot water supply circuit, a heating circuit, etc.) can be configured. In the following description, a hot water supply circuit by the secondary side circulation path 30 provided with a set of the primary side circulation path 20, the indirect heat exchanger 50, the sub heat exchanger 60, and the currant 32 will be described.

  In the second embodiment, only differences from the first embodiment will be described. In the second embodiment, as in the first embodiment, the latent heat recovery heat exchanger 40 is used to heat the heat transfer medium circulating in the primary circulation path 20 as in the first embodiment. ing.

  As shown in FIG. 2, in the second embodiment, the heat exchange between the heat transfer water circulating through the primary circuit 20 and the secondary hot water circulating through the secondary circuit 30 is transferred to the indirect heat exchanger 50. In addition, the sub heat exchanger 60 is used. Further, the sub heat exchanger 60 is disposed upstream immediately before the heat transfer water circulating in the primary side circulation path 20 is supplied to the latent heat recovery heat exchanger 40.

  That is, in the second embodiment, a relatively high-temperature heat transfer water heated in the combustion chamber of the hot water generator main body 11 is circulated through the primary side circulation path 20 and supplied to the indirect heat exchanger 50, On the other hand, a relatively low temperature secondary hot water is circulated through the secondary side circulation path 30 and supplied to the indirect heat exchanger 50 by supplying water or the like, so that a high temperature heat transfer water and a low temperature secondary hot water are used. The secondary hot water circulating in the secondary side circulation path 30 is preheated by the sub heat exchanger 60 upstream from the indirect heat exchanger 50 as well as heating the low temperature secondary hot water by heat exchange. The heat medium water circulating in the primary side circulation path 20 is immediately upstream of being supplied to the latent heat recovery heat exchanger 40 and further deprived of the heat by the sub heat exchanger 60, so that the temperature is lowered.

  As a result, the heat transfer water circulating in the primary side circulation path 20 is heat-exchanged in the indirect heat exchanger 50, and further, the heat is taken away by the sub heat exchanger 60, and the heat for latent heat recovery is reduced. Since the heat is supplied to the exchanger 40, it is possible to perform heat exchange more efficiently than in the first embodiment inside the heat exchanger 40 for recovering latent heat.

  Moreover, since the secondary hot water circulating through the secondary side circulation path 30 is heated by the indirect heat exchanger 50 and the sub heat exchanger 60, it is efficiently heated, and the heating time is increased. Can also be shortened.

(Third embodiment)
Here, the hot water generator according to the third embodiment of the present invention will be specifically described with reference to the drawings. FIG. 3 is a schematic diagram showing a hot water generator 10 ″ according to the third embodiment of the present invention. In the following third embodiment, the first embodiment and the second embodiment described above are compared. Except for the different parts, the same reference numerals are given for easy understanding, and the description is omitted.

  As shown in FIG. 3, the hot water generator 10 ″ according to the third embodiment includes a combustion chamber 13 provided with a burner device 12, and a hot water generator main body 11 capable of accommodating heat transfer water, The primary-side circulation path 20 that circulates the heat transfer water accommodated in the generator body 11 and the primary-side circulation path 20 are configured independently of each other and are outlet terminals provided for hot water supply. A secondary-side circulation path 30 that includes a plurality of currants 32 and circulates secondary hot water discharged from each of the currants 32, a high-temperature heat transfer water that circulates in the primary-side circulation path 20, and a secondary-side circulation path 30 An indirect heat exchanger 50 that performs heat exchange with the circulating low-temperature secondary hot water, a latent heat recovery heat exchanger 40 that recovers heat (sensible heat, latent heat) of exhaust gas generated by the combustion of the burner device 12, and The first embodiment and the second embodiment described above are provided. Similarly to the embodiment, the secondary hot water discharged from the currant 32 is a high-temperature heat that circulates the water supplied from the water source (not shown) to the secondary side circulation path 30 through the primary side circulation path 20. Heat is exchanged with the medium water and the indirect heat exchanger 50 for heating.

  Furthermore, the hot water generator 10 ″ according to the third embodiment includes a bypass 16 that connects the combustion chamber 13 and the flue 15. An exhaust gas that passes through the bypass 16 is disposed substantially inside the bypass 16. A flue damper 17 is installed as a flow rate adjusting means capable of adjusting the flow rate.

  In the third embodiment, similarly to the first embodiment and the second embodiment described above, a plurality of primary-side circulation paths 20 and a plurality of indirect heat exchangers 50 are provided, and a plurality of corresponding ones are provided. A secondary side circulation path 30 is provided. And a circuit is constituted by a set of primary side circulation path 20, indirect heat exchanger 50, and secondary side circulation path 30, for example, a plurality of circuits (for example, hot water supply circuit, Heating circuit etc.).

  In the following description, only differences from the first embodiment and the second embodiment described above will be described. In the third embodiment, as in the first embodiment and the second embodiment, as the primary circulation system, the latent heat recovery is performed to heat the heat transfer water circulating through the primary circulation circuit 20. A heat exchanger 40 is used.

  As shown in FIG. 3, the hot water generator 10 ″ in the third embodiment includes a heat exchanger for recovering latent heat in the flue 15 before exhaust gas passes through the heat exchanger 40 for recovering latent heat in the combustion chamber 13. A bypass 16 is provided in communication after the exhaust gas passes through 40. This bypass 16 shortcuts a part of the exhaust gas discharged from the combustion chamber 13 to the flue 15 and passes to the flue 15. It is for making it happen.

  The exhaust gas discharged from the combustion chamber 13 to the flue 15 is recovered with latent heat by the latent heat recovery heat exchanger 40 and remains in a state where it is likely to condense below a predetermined temperature (for example, 100 ° C.). When discharged outside, acidic condensation water is generated by cooling with the outside air, and adheres to the vicinity of the exhaust port of the flue 15 to cause metal corrosion, or a plant generated in the vicinity of the exhaust port of the flue 15 Or cause necrosis.

  For this reason, by passing a part of the high-temperature exhaust gas having a low humidity discharged from the combustion chamber 13 and having a low temperature directly through the flue 15, the latent heat is recovered by the latent heat recovery heat exchanger 40 and the humidity is high. Mixing with low temperature exhaust gas (that is easy to condense), the humidity of the exhaust gas discharged from the flue 15 is lowered to a high temperature, and the exhaust gas discharged from the flue 15 comes into contact with the outside air This prevents the formation of acidic condensed water.

  A flue damper 17 having a valve mechanism is installed substantially inside the bypass 16. The flue damper 17 is for adjusting the flow rate of the exhaust gas passing through the bypass 16.

  In other words, in the third embodiment, a sensor (not shown) for measuring the humidity and temperature of the exhaust gas to be discharged is provided in the vicinity of the external discharge port (not shown) of the flue 15. The exhaust gas discharged from the flue 15 is adjusted by increasing or decreasing the flow rate of the exhaust gas passing through the bypass 16 by the flue damper 17 having a valve mechanism in accordance with the humidity and temperature of the exhaust gas to be discharged. The humidity and temperature of the gas are set so that acidic condensed water is not generated by cooling with outside air.

  Specifically, in the third embodiment, when the humidity and temperature of the exhaust gas to be discharged are numerical values at which acidic condensed water is easily generated, the exhaust gas passes through the bypass 16 by the valve mechanism of the flue damper 17. Increase the exhaust gas flow rate. As a result, the exhaust gas discharged from the flue 15 is discharged in a state in which it is difficult to generate acidic condensed water by cooling with the outside air because the humidity decreases and the temperature increases.

  On the other hand, when the humidity and temperature of the exhaust gas discharged are numerical values that do not generate acidic condensed water, the flow rate of the exhaust gas passing through the bypass 16 is reduced by the valve mechanism of the flue damper 17. As a result, the amount of exhaust gas whose latent heat is recovered by the latent heat recovery heat exchanger 40 increases, so that the heat exchange rate by the latent heat recovery heat exchanger 40 can be improved.

  Thereby, in 3rd Embodiment, 1st Embodiment and 2nd Embodiment are used by using the same heat exchanger 40 for latent heat collection | recovery as 1st Embodiment and 2nd Embodiment mentioned above as a primary side circulation system. In addition to having the same effect as the above, it prevents the generation of acidic condensed water by the exhaust gas exhausted from the flue 15 and generates it near or near the metal corrosion near the exhaust gas exhaust port of the flue 15. Necrosis of plants and the like can be prevented.

  In the third embodiment, the flue gas damper 17 having a valve mechanism is used as the flow rate adjusting means for the exhaust gas passing through the bypass 16. However, as the flow rate adjusting means, the exhaust gas passing through the bypass 16 is controlled. For example, a valve mechanism or the like can be used as long as the flow rate can be adjusted.

  As mentioned above, according to each embodiment mentioned above, the temperature of the heat transfer water supplied to the latent heat recovery heat exchanger 40 is stably reduced by using the latent heat recovery heat exchanger 40 in the primary side circulation system. Therefore, the hot water generator 10 (10 ′) including the latent heat recovery heat exchanger 40 with high safety can prevent the latent heat recovery heat exchanger 40 from being overheated by the high-temperature exhaust gas. 10 ″) and a circuit to be connected even when a plurality of circuits (hot water supply, heating, circulation heating, etc.) are connected by supplying low-temperature heat transfer water to the latent heat recovery heat exchanger 40 There is no need to set the conditions.

  In addition, in 2nd Embodiment mentioned above, it is set as the structure which added the sub heat exchanger 60 to 1st Embodiment, and in 3rd Embodiment, the structure which added the bypass 16 which comprises the flue damper 17 to 1st Embodiment. As described above, the sub heat exchanger 60 and the bypass 16 including the flue damper 17 may be added to the first embodiment.

  From each of the embodiments described above, the following hot water generator 10 (10 ', 10 ") can be realized.

(1) Hot water generator main body 11 that contains the heat transfer water, the combustion chamber 13 that heats the heat transfer water in the hot water generator main body 11, and the smoke that discharges the exhaust gas discharged from the combustion chamber 13 to the outside Exhaust by the latent heat recovery heat exchanger 40 by circulating the heat transfer water in the hot water generator main body 11 by circulating the heat transfer water 40 in the hot water generator main body 11 and the heat exchanger 40 disposed in the connection portion between the passage 15 and the combustion chamber and the flue. The primary side circulation path 20 that exchanges heat with the latent heat of the gas, the secondary side circulation path 30 that is configured independently of the primary side circulation path 20 and circulates the secondary hot water and the primary side circulation path 20 circulate. A hot water generator 10 (10 ′, 10 ″), which includes an indirect heat exchanger 50 that performs heat exchange between the heat transfer medium that performs heat exchange with the secondary hot water circulating through the secondary-side circulation path 30.

  When the hot water generator 10 (10 ′, 10 ″) having such a configuration is used, for example, when hot water is supplied, a relatively low temperature is used by using heat transfer water circulating through the relatively high temperature primary side circulation path 20. Heat medium water circulating through the secondary side circulation path 30 is heat-exchanged by the indirect heat exchanger 50 and heated to supply hot water, and further, the heat medium circulating through the primary side circulation path 20 whose temperature has decreased due to heat exchange The water can be preheated by the latent heat recovery heat exchanger 40 and recirculated to the hot water generator main body 11, so that the heat of the exhaust gas can be effectively utilized to improve fuel consumption, reduce carbon dioxide, It can be set as the warm water generator 10 (10 ', 10 ") in consideration of environment, such as prevention of an effect.

(2) a second indirect heat exchanger (sub heat exchanger 60) that performs heat exchange between the heat transfer water circulating through the primary circuit 20 and the secondary hot water circulating through the secondary circuit 30; A hot water generator 10 ′ provided upstream of the latent heat recovery heat exchanger 40. At this time, the second indirect heat exchanger (sub heat exchanger 60) is provided at a position immediately before the heat transfer water circulating in the primary side circulation path 20 is supplied to the latent heat recovery heat exchanger 40. Yes.

  With such a configuration, the secondary hot water circulating in the secondary circulation path 30 is further efficiently heated by the sub heat exchanger 60 by the heat medium water circulating in the primary circulation path 20, and the primary circulation. Since the temperature of the heat transfer water supplied to the latent heat recovery heat exchanger 40 through the passage 20 can be lowered, the heat transfer efficiency inside the latent heat recovery heat exchanger 40 can be improved. .

  (3) A hot water generator 10 ″ provided with a bypass 16 for leading the exhaust gas discharged from the combustion chamber 13 to the flue 15 without passing through the latent heat recovery heat exchanger 40.

  With this configuration, it is possible to prevent the exhaust gas having a high humidity and a low temperature exhausted from the flue 15 from being cooled by the outside air to generate acidic condensed water. It is possible to prevent metal corrosion in the vicinity of the discharge port and necrosis of plants generated in the vicinity thereof.

  (4) A hot water generator 10 ″ provided with a flue damper 17 as a flow rate adjusting means capable of adjusting the flow rate of exhaust gas passing through the bypass 16.

  With this configuration, the flow rate of the exhaust gas passing through the bypass 16 can be adjusted according to the humidity and temperature of the exhaust gas discharged from the flue 15, so that an efficient latent heat recovery heat exchanger 40 is used. Heat exchange.

  Although the embodiments have been described above, the specific configuration of the present invention is not limited to the above-described embodiments, and design changes and the like within a scope not departing from the gist of the invention are included in the present invention.

DESCRIPTION OF SYMBOLS 10 Hot water generator 11 Hot water generator main body 12 Burner apparatus 13 Combustion chamber 15 Flue 16 Bypass 17 Flue damper 20 Primary side circulation path 21 Primary side circulation pump 22 Check valve 23 Water collection path 30 Secondary side circulation path 31 Secondary circulation pump 32 Karan 40 Heat exchanger for latent heat recovery 50 Indirect heat exchanger 60 Sub heat exchanger

Claims (3)

A hot water generator main body for storing heat transfer water,
A combustion chamber for heating the heat transfer water in the hot water generator body;
A flue extended outside the combustion chamber to discharge the exhaust gas discharged from the combustion chamber to the outside ;
A latent heat recovery heat exchanger disposed at a connection between the combustion chamber and the flue;
A primary side circulation path Ru circulating the heat transfer water of the hot water generator body,
Is constructed independently of the primary side circulation path, and the secondary side circulation path for circulating the secondary hot water for hot water supply from Curran,
An indirect heat exchanger that performs heat exchange between the heat transfer water circulating through the primary circuit and the secondary hot water circulating through the secondary circuit;
Equipped with a,
The starting end of the primary side circulation path is connected to the upper part of the hot water generator main body, and the indirect heat exchanger is interposed in the middle of the primary side circulation path and the middle of the secondary side circulation path. And
The primary side circulation path extended from the indirect heat exchanger is connected to one end of the latent heat recovery heat exchanger,
The other end of the latent heat recovery heat exchanger is connected to the end of the primary side circulation path communicating with the hot water generator body,
In the indirect heat exchanger, the heat transfer water circulating in the primary side circulation path in a state where the temperature is lowered by heat exchange with the secondary hot water circulating in the secondary side circulation path, A warm water generator preheated by the latent heat recovery heat exchanger provided on the downstream side and circulated in the warm water generator main body .   A second indirect heat exchanger for exchanging heat between the heat transfer water circulating in the primary side circulation path and the secondary hot water circulating in the secondary side circulation path, upstream of the latent heat recovery heat exchanger; The hot water generator according to claim 1, wherein the hot water generator is provided. The exhaust chamber communicates between the combustion chamber before passing through the latent heat recovery heat exchanger and the flue after the exhaust gas passes through the latent heat recovery heat exchanger, and then from the combustion chamber. Rutotomoni a bypass exhaust gas discharged derives said flue without passing through the latent heat recovery heat exchanger, the flow rate adjusting means provided in the middle of the bypass, the flow rate of the exhaust gas passing through the bypass The hot water generator according to claim 1 or 2, characterized in that it can be adjusted .

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