JP2003329307A - Heat exchange device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost latent heat recovery heat exchange device having a simple structure without boiling accumulated water in a heat transfer pipe. <P>SOLUTION: This heat exchange device is provided with: a first combustion part 20 and a second combustion part 21 installed adjacently to each other; a can body 27 installed on the downstream side of both the combustion parts; the first heat transfer pipe 28 and the second heat transfer pipe 29 installed in the can body; an exhaust gas passage 33 formed on the downstream side of both the heat transfer pipes; a uniformly mixing means 34 installed in the exhaust gas passage for uniformly mixing a fluid flowing through the exhaust passage; and an auxiliary heat transfer pipe 35 installed on the downstream side of the uniformly mixing means. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a latent heat recovery heat exchange device for home or business use, and more specifically, a one-can multi-circuit latent heat recovery heat used for combined use such as hot water supply and bath, or hot water supply and heating. The present invention relates to a switching device.

[0002]

2. Description of the Related Art Heretofore, as a latent heat recovery heat exchange device of this type, there has been one disclosed in, for example, Japanese Patent Application Laid-Open No. 10-267414. FIG. 13 shows a conventional latent heat recovery heat exchange device described in the above publication.

In FIG. 13, 1 is a burner, 2 is a gas pipe for supplying fuel gas to the burner 1, 3 is a fan for supplying combustion air to the burner 1, and 4 is downstream of combustion gas generated by combustion of the burner 1. The hot-water supply heat exchanger 5 is located, 5 is a reheating heat exchanger that is arranged vertically above the hot-water supply heat exchanger 4, 6 is a hot-water supply heat transfer tube forming the hot-water supply heat exchanger 4, and 7
Is a reheating heat transfer tube forming a reheating heat exchanger, 8 is a hot water supply latent heat recovery heat exchanger installed downstream of the combustion gas of the hot water supply heat exchanger 4, and 9 is a hot water supply latent heat forming a hot water supply latent heat recovery heat exchanger The heat transfer pipes 10 are hot water pipes that connect the outlet 9b of the latent hot water heat transfer pipe 9 and the inlet 6a of the hot water heat transfer pipe 6. Reference numeral 11 is a water supply pipe connected to the inlet 9a of the latent hot water heat transfer pipe 9, 12 is a hot water supply pipe connected to the outlet 6b of the hot water heat transfer pipe 6, 13 is a bath return pipe connected to the inlet of the additional heat transfer pipe 7, and 14 is a follow-up pipe. It is a bathing pipe connected to the outlet of the cooking heat transfer pipe 7. Also, 1
Reference numeral 5 denotes a bypass passage communicating with the hot water supply pipe 12 of the hot water supply heat exchanger 4 and the inlet 9a of the latent heat recovery heat exchanger 8 for hot water supply. The bypass passage 15 has an inlet 6b from the outlet 6b of the hot water heat transfer pipe. A check valve 15a is provided in the direction of flow to 9a.

The hot-water supply heat exchanger 4 and the reheating heat exchanger 5 are heated by the common burner 1, and the water supplied from the water supply pipe 11 enters the hot-water supply latent heat recovery heat exchanger 8 and the hot-water supply heat exchanger 4 and the additional heating heat. It is heated by the combustion gas that has passed through the exchanger 5, enters the hot water supply heat exchanger 4 through the hot water pipe 10, is further heated by the combustion gas generated by the burner 1, reaches a predetermined temperature, and flows out from the hot water supply pipe 12. The hot water supply latent heat recovery heat exchanger 8 mainly recovers the condensation latent heat contained in the water vapor in the combustion gas. Also, bath water (not shown) bath water or the like is reheated from the bath return pipe 13 into the heat exchanger 5, heated by the combustion gas, and then flows to the bath aquarium (not shown) through the bath going pipe 14. .

When the bath is operated independently, heat is added to the accumulated water in the hot water supply heat transfer pipes 6 that are not in operation, and the accumulated water temperature rises. However, the accumulated water temperature rises from the hot water heat exchanger 4 due to natural convection. Also tries to flow to the hot water supply latent heat recovery heat exchanger 8 side provided on the upper side. And the bypass passage 15
Due to the restriction of the flow direction of the check valve 15a provided in the hot water, the accumulated water whose temperature has risen flows from the outlet 6b of the hot water heat exchanger 4 to the inlet 9a of the latent heat recovery heat exchanger 8 of the hot water via the bypass passage 15. It passes through the latent heat recovery heat exchanger 8, reaches the inlet 6a of the hot water supply heat exchanger 4 through the hot water pipe 10, and passes through the hot water supply heat exchanger 4 again from its outlet 6b to the bypass passage 1
The circulation operation of the hot water supply side circulation circuit is continuously performed.

[0006] As described above, since the accumulated water in the hot water supply heat exchanger 4 heated by the burner 1 at the time of additional combustion in the bath is circulated through the hot water supply side circulation circuit, the temperature of the accumulated water in the hot water supply heat transfer pipe 6 is increased. The rise can be moderated. Therefore, it is possible to suppress boiling of the accumulated water in the hot water supply heat transfer tube 6 of the hot water supply heat exchanger 4 during the single combustion of the bath.

Further, since the hot water supply latent heat recovery heat exchanger 8 is provided, even the latent heat of condensation of water vapor in the combustion gas can be recovered during the hot water supply operation, and high thermal efficiency can be obtained.

[0008]

However, in the above-mentioned conventional configuration, when the bath is independently burned, the circulation circuit formed by the bypass passage 15 suppresses the temperature rise of the accumulated water in the hot water supply heat transfer pipe 6 to prevent boiling. However, when the bath alone burns, the combustion gas that has passed through the hot water supply heat exchanger 4 and the reheating heat exchanger 5 passes through the hot water supply latent heat recovery heat exchanger 8,
Since the hot water supply latent heat transfer tube 9 is heated, there is a problem that the temperature of the accumulated water in the hot water supply latent heat transfer tube 9 also rises and boils. On the other hand, in order to suppress an increase in the water temperature in the hot water supply latent heat transfer tube 9, it is necessary that the combustion exhaust gas during the single combustion of the bath does not pass through the hot water supply latent heat recovery heat exchanger 8. If the exhaust passage for exclusive use of hot water supply and the exhaust passage for exclusive use of bath combustion are provided, the heat exchange device has a very complicated configuration including the control unit, and thus there is a problem that the cost greatly expands.

An object of the present invention is to solve the above-mentioned conventional problems, and an object thereof is to provide a latent heat recovery heat exchange device having a simple structure and not boiling boiling water in the latent heat transfer pipe for hot water supply.

[0010]

In order to solve the above-mentioned conventional problems, the present invention provides a first combustion section and a second combustion section that are adjacent to each other, and a can body provided downstream of both combustion sections. And a first heat transfer pipe and a second heat transfer pipe provided in the can body, an exhaust gas passage provided downstream of both heat transfer pipes, and a fluid provided in the exhaust gas passage and flowing through the exhaust gas passage are uniformly mixed. Provided is a heat exchange device comprising a uniform mixing means and a sub heat transfer tube provided on the downstream side of the uniform mixing means.

In the above heat exchange device, when the first combustion section is operated independently, the first feed water flowing through the sub heat transfer tube is heated by the combustion gas passing through the first heat transfer tube and the second heat transfer tube, and then the sub heat transfer tube It flows to the communicating first heat transfer tube, is further heated to a predetermined temperature by the combustion gas, and flows out from the first heat transfer tube. The sub heat transfer tube mainly recovers the latent heat of condensation of water vapor in the combustion gas. Here, by arranging the first heat transfer tube and the second heat transfer tube adjacent to each other, for example, in a pair tube, the heat of the accumulated water in the second heat transfer tube moves to the first heat transfer tube through which the temperature rises and the boiling is prevented. It is configured to do.

In the second combustion section alone operation, the second feed water flowing through the second heat transfer tube is heated by the high temperature combustion gas formed from the second combustion section, reaches a predetermined temperature, and flows out from the second heat transfer tube. At this time, the first combustion section does not burn, but air is sent into the can body through the first combustion section. The air at room temperature passes through the first heat transfer tube and the second heat transfer tube and flows into the exhaust gas passage together with the high temperature combustion gas generated from the second combustion section. Here, the high temperature combustion gas is deprived of heat and becomes a low temperature combustion gas. And, although the temperature of this room temperature air has risen a little, it is much lower than that of the high temperature combustion gas.
Since this air and the low-temperature combustion gas are homogenized and the temperature of the low-temperature combustion gas further decreases, it is possible to prevent the accumulated water in the sub-heat transfer tube from boiling when passing through the sub-heat transfer tube located on the downstream side.

In this way, the air sent from the first combustion section flowing through the exhaust gas passage and the combustion gas generated from the second combustion section become a uniform low-temperature fluid by the uniform mixing means provided in the exhaust gas passage, and the sub-transmission occurs. Since the accumulated water in the heat pipe can be prevented from boiling, it is possible to provide a low-cost heat exchange device capable of preventing boiling with a simple structure.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heat exchange device according to a first aspect of the present invention is provided with a first combustion section and a second combustion section which are provided adjacent to each other, a can body provided downstream of both combustion sections, and a can body provided inside the can body. A first heat transfer tube and a second heat transfer tube, an exhaust gas passage provided on the downstream side of both heat transfer tubes, a uniform mixing means provided in the exhaust gas passage for uniformly mixing fluids flowing through the exhaust gas passage, And a sub heat transfer tube provided on the downstream side of the uniform mixing means.

In the above heat exchange device, when the first combustion section is operated independently, the first feed water flowing through the sub heat transfer tube is heated by the combustion gas passing through the first heat transfer tube and the second heat transfer tube, and then the sub heat transfer tube It flows to the communicating first heat transfer tube, is further heated to a predetermined temperature by the combustion gas, and flows out from the first heat transfer tube. The sub heat transfer tube mainly recovers the latent heat of condensation of water vapor in the combustion gas.

When the second combustion section is operated independently, the second feed water flowing through the second heat transfer tube is heated by the high temperature combustion gas formed from the second combustion section, reaches a predetermined temperature, and flows out from the second heat transfer tube. At this time, the first combustion section does not burn, but air is sent into the can body through the first combustion section. The air at room temperature passes through the first heat transfer tube and the second heat transfer tube and flows into the exhaust gas passage together with the high temperature combustion gas generated from the second combustion section. Here, the high temperature combustion gas is deprived of heat and becomes a low temperature combustion gas. And, although the temperature of this room temperature air has risen a little, it is much lower than that of the high temperature combustion gas.
Since this air and the low-temperature combustion gas are homogenized and the temperature of the low-temperature combustion gas further decreases, it is possible to prevent the accumulated water in the sub-heat transfer tube from boiling when passing through the sub-heat transfer tube located on the downstream side.

Here, the first heat transfer tube and the second heat transfer tube are arranged adjacent to each other, for example, by forming a pair of tubes so that the first heat transfer tube or the second heat transfer tube can be operated both during the first combustion section independent operation and during the second combustion section independent operation. The heat of the stagnant water in the heat transfer tube moves to the second heat transfer tube or the first heat transfer tube through which water flows, and suppresses the temperature rise to prevent boiling of the stagnant water.

In this way, the air sent from the first combustion section flowing through the exhaust gas passage and the combustion gas generated from the second combustion section become a uniform low-temperature fluid by the uniform mixing means provided in the exhaust gas passage, and the sub-transmission occurs. Since the accumulated water in the heat pipe can be prevented from boiling, it is possible to provide a low-cost heat exchange device capable of preventing boiling with a simple structure.

According to a second aspect of the present invention, there is provided a heat exchange device in which a first combustion section and a second combustion section are provided adjacent to each other, an air chamber for supplying combustion air provided upstream of both combustion sections, A can body provided downstream of the combustion section, a first heat transfer tube and a second heat transfer tube provided in the can body, an exhaust gas passage provided downstream of both heat transfer tubes, and a secondary heat transfer passage provided in the exhaust gas passage. A heat pipe and a bypass air passage that directly connects the exhaust gas passage and the air chamber are provided.

In the above heat exchange device, since the operation and effect are the same as those described in claim 1 when the first combustion section is in the single operation, the description thereof will be omitted here.

During the second combustion section alone operation, normal temperature air is sent to the exhaust gas passage from the bypass air passage which directly connects the exhaust gas passage and the air chamber. Then, this air is mixed with the combustion gas generated from the second combustion section to further lower the temperature of the combustion gas, whereby the temperature rise of the accumulated water in the auxiliary heat transfer pipe provided in the exhaust gas passage can be suppressed and boiling can be prevented.

By thus providing the bypass air passage which directly connects the exhaust gas passage and the air chamber, the temperature of the combustion gas flowing through the exhaust gas passage can be lowered by a small amount of room temperature air, so that the temperature is simple. It is possible to provide a low-cost heat exchange device capable of preventing boiling with a configuration.

According to a third aspect of the present invention, there is provided a heat exchange device in which a first combustion section and a second combustion section are provided adjacent to each other, an air chamber for supplying combustion air provided upstream of both combustion sections, A can body provided downstream of the combustion section, a first heat transfer tube and a second heat transfer tube provided in the can body, an ambient air flow path that is provided around the can body and communicates with an air chamber, and downstream of both heat transfer tubes. An exhaust gas passage provided in the exhaust gas passage, an auxiliary heat transfer pipe provided in the exhaust gas passage, and a flow adjusting means for allowing the air flowing through the ambient air flow passage in the exhaust gas passage to flow into the exhaust gas passage. .

In the above heat exchange device, since the operation and effect are the same as those in claim 1 when the first combustion section is in the single operation, the description thereof will be omitted here.

During the second combustion section alone operation, room temperature air is sent from the air chamber to the ambient air flow path communicating with the air chamber provided around the can body, and this air flows along the inner wall of the can body. It passes through the heat transfer tube and the second heat transfer tube section and flows into the exhaust gas passage. Then, since this air flows toward the inside of the exhaust gas passage by the flow control means provided in the exhaust gas passage, for example, the flow direction guide, this air mixes with the combustion gas generated from the second combustion section, The temperature can be further lowered and boiling of accumulated water in the sub heat transfer tube can be prevented.

As described above, by providing the flow adjusting means for flowing the air flowing through the ambient air flow path into the exhaust gas passage, the temperature of the combustion gas is lowered by mixing the air with the combustion gas flowing through the exhaust gas passage. Therefore, it is possible to provide a low-cost heat exchange device capable of preventing boiling with a simple configuration.

According to a fourth aspect of the present invention, there is provided a heat exchange device in which a first combustion section and a second combustion section are provided adjacent to each other, an air chamber for supplying combustion air provided upstream of both combustion sections, A can body provided downstream of the combustion section, a first heat transfer tube and a second heat transfer tube provided in the can body, an exhaust gas passage provided downstream of both heat transfer tubes, and a sub heat transfer tube provided in the exhaust gas passage. And a flow damper provided in the exhaust gas passage for adjusting the flow direction of the combustion gas flowing through the exhaust gas passage, and a drive means for controlling the flow damper.

In the above heat exchange device, the operation and effect of the first combustion section alone operation are the same as those of the first aspect, and the description thereof will be omitted here.

During independent operation of the second combustion unit, the direction of the flow damper provided in the exhaust gas passage can be changed by the driving means, so that the flow direction of the combustion gas generated from the second combustion unit flowing through the exhaust gas passage is By controlling the combustion gas, it is possible to uniformly heat the entire sub heat transfer tube without heating only the local part of the sub heat transfer tube, so it is possible to suppress the temperature rise of the accumulated water in the sub heat transfer tube. It is possible to prevent boiling.

As described above, by changing the direction of the flow damper using the driving means, the combustion gas can uniformly heat the entire sub heat transfer tube without heating only the local portion of the sub heat transfer tube. Since the temperature rise of the accumulated water in the sub heat transfer tube can be suppressed, it is possible to provide a low-cost heat exchange device capable of preventing boiling with a simple configuration.

According to a fifth aspect of the present invention, there is provided a heat exchange device in which a first combustion section and a second combustion section are provided adjacent to each other, a can body provided downstream of both combustion sections, and a first transfer section provided in the can body. A heat pipe and a second heat transfer pipe, an exhaust gas passage provided on the downstream side of both heat transfer pipes, a sub heat transfer pipe provided in the exhaust gas passage, and a combustion amount limiting means for limiting the maximum combustion amount of the second combustion section. I have it.

In the above heat exchange device, since the operation and effect are the same as those described in claim 1 when the first combustion section is in the independent operation, the description thereof will be omitted here.

During independent operation of the second combustion section, the accumulated water in the sub-heat transfer tube which is not operated is heated by the combustion gas generated from the second combustion section and rises in temperature, but the maximum combustion amount of the second combustion section is limited by the combustion amount. By setting the accumulated water so as not to boil by the means, it is possible to reliably prevent the accumulated water from boiling.

As described above, by limiting the maximum amount of combustion in the second combustion section by using the combustion amount limiting means, it is possible to reliably prevent the accumulated water in the sub heat transfer tube from boiling, so that the second combustion section Although the required operating time of the second combustion section is slightly lengthened due to the limited amount of combustion, it is possible to provide a heat exchange device with a simple configuration that can reliably prevent boiling at low cost.

According to a sixth aspect of the present invention, there is provided a heat exchange device in which a first combustion section and a second combustion section are provided adjacent to each other, a can body provided downstream of both combustion sections, and a first transfer section provided in the can body. The heat pipe and the second heat transfer pipe, the exhaust gas passage provided on the downstream side of the both heat transfer pipes, the sub heat transfer pipe communicating with the first heat transfer pipe provided in the exhaust gas passage, the inlet side of the sub heat transfer pipe and the first heat transfer pipe. A circulation passage that connects the outlet side of one heat transfer tube and a circulation pump provided in the circulation passage are provided.

In the above heat exchange device, since the operation and effect are the same as those described in claim 1 when the first combustion section is in the single operation, the description thereof will be omitted here.

During independent operation of the second combustion section, the inlet of the sub heat transfer tube and the outlet of the first heat transfer tube are communicated by the circulation passage to form a circulation circuit. The accumulated water in the first heat transfer tube is driven and forcedly circulates. Then, the retained water, which has received the heat of the combustion gas in the sub heat transfer tube and the first heat transfer tube and has its temperature raised, is forcibly circulated and the heat is radiated in the circulation passage portion to lower the temperature and prevent boiling.

As described above, the first heat transfer pipe and the sub heat transfer pipe are made into a circulation circuit by the circulation passage, and the accumulated water therein is forcibly driven by using the circulation pump, so that the accumulated water whose temperature has risen is radiated in the circulation passage. Since the temperature rise can be suppressed, the temperature of the accumulated water in the first heat transfer pipe and the sub heat transfer pipe can be reduced to prevent boiling, and a heat exchange device capable of preventing boiling at a low cost with a simple structure is provided. You can

According to a seventh aspect of the present invention, there is provided a heat exchange device in which a first combustion section and a second combustion section are provided adjacent to each other, a can body provided downstream of both combustion sections, and a first transfer section provided in the can body. The heat pipe and the second heat transfer pipe, the exhaust gas passage provided on the downstream side of the both heat transfer pipes, the sub heat transfer pipe communicating with the first heat transfer pipe provided in the exhaust gas passage, and the element provided at the inlet of the sub heat transfer pipe. A stop valve and a water drain passage provided at the outlet of the auxiliary heat transfer tube are provided.

In the above heat exchange device, the operation and effect of the first combustion section alone operation are the same as those described in claim 1, and therefore the description thereof is omitted here.

During the second combustion section alone operation, the main stop valve provided at the inlet of the sub heat transfer tube is operated to close the inlet of the sub heat transfer tube, open the outlet of the sub heat transfer tube, and open the outlet of the sub heat transfer tube to the inside of the sub heat transfer tube. By removing the accumulated water in the second heat transfer tube, the auxiliary heat transfer tube is heated by the combustion gas generated from the second combustion section in an empty state, so that the second combustion section can be operated independently without boiling water in the tube. .

As described above, by using the main stop valve and the water drainage passage, the sub heat transfer pipe is heated by the combustion gas in a state where the accumulated water is drained. Here, the sub heat transfer tube made of a corrosion resistant material such as titanium or stainless steel can withstand heating to combustion gas without accumulated water. As described above, it is possible to provide a heat exchange device that has a simple structure and can prevent boiling at a low cost without worrying about boiling of accumulated water.

In the heat exchange device according to the eighth aspect, the first combustion section and the second combustion section provided adjacent to each other, the can body provided downstream of the both combustion sections, and the first transfer section provided in the can body. A heat pipe and a second heat transfer pipe, an exhaust gas passage provided on the downstream side of both heat transfer pipes, a sub heat transfer pipe communicating with the first heat transfer pipe provided in the exhaust gas passage, and a second combustion section in the exhaust gas passage. And an exhaust passage through which the sub-heat transfer tubes provided at positions corresponding to are not arranged.

In the above heat exchange device, since the operation and effect are the same as those described in claim 1 when the first combustion section is in the single operation, the description thereof will be omitted here.

During independent operation of the second combustion section, the second combustion section flowing through the exhaust gas passage is provided by providing a passing exhaust passage in which a sub heat transfer tube is not arranged at a position corresponding to the second combustion section in the exhaust gas passage. Since the combustion gas generated from the exhaust gas can be discharged through the exhaust passage without heating the auxiliary heat transfer pipe, the temperature of the accumulated water in the auxiliary heat transfer pipe rises while avoiding heat exchange with the combustion gas. It is possible to prevent boiling without fail.

As described above, by providing the passing exhaust passage without arranging the auxiliary heat transfer pipes at the position corresponding to the second combustion portion in the exhaust gas passage, the exhaust passage dedicated for the first combustion portion and the exhaust passage dedicated for the second combustion portion are provided. It is possible to provide a heat exchange device capable of preventing boiling at low cost with a simple structure without providing separate passages.

According to a ninth aspect of the present invention, there is provided a heat exchange device in which a first combustion section and a second combustion section are provided adjacent to each other, a can body provided downstream of both combustion sections, and a first transfer section provided in the can body. A heat pipe and a second heat transfer pipe, an exhaust gas passage provided on the downstream side of the both heat transfer pipes, a sub heat transfer pipe that communicates with the first heat transfer pipe provided in the exhaust gas passage to recover the steam condensation latent heat of the combustion gas, A neutralization device that collects and neutralizes dew condensation water generated in the sub heat transfer tube, a bypass shower water channel provided at the inlet side of the sub heat transfer tube, a flow control means provided in the bypass shower water channel, and an inside of the sub heat transfer tube The temperature detecting means for detecting the temperature and the outlet for communicating with the bypass shower water passage and for spraying water on the surface of the sub heat transfer pipe are provided.

In the above heat exchange device, since the operation and effect of the first combustion section alone operation are the same as those of the first aspect, the description thereof will be omitted here.

During the independent operation of the second combustion section, the accumulated water in the sub-heat transfer tube which is not operated is heated by the combustion gas generated from the second combustion section and rises in temperature. The temperature of this accumulated water is detected by the temperature detecting means. When the temperature is detected and reaches a predetermined temperature, the flow rate control means is activated to open the bypass shower water passage and jet water from the outlet. Then, the jetted water exchanges heat with the combustion gas and the sub-heat transfer pipe whose temperature has risen, cools the accumulated water, and then flows into the neutralization device. It becomes possible to prevent boiling of the accumulated water by such cooling means.

As described above, by spraying water to the sub heat transfer tube whose temperature has risen by using the bypass shower water passage, the temperature rise of the accumulated water can be suppressed to a predetermined temperature or less to prevent boiling surely, and at the same time, to the sub heat transfer tube. The fountain can clean the surface of the sub heat transfer tube by washing off the dust and other deposits adhering to the surface of the sub heat transfer tube due to the operation of the first combustion section, so the performance of the sub heat transfer tube when the first combustion section operates To maintain durability.

According to a tenth aspect of the present invention, there is provided a heat exchange device in which a first combustion section and a second combustion section are provided adjacent to each other, a can body provided downstream of both combustion sections, and a first transfer section provided in the can body. A heat pipe and a second heat transfer pipe, an exhaust gas passage provided on the downstream side of the both heat transfer pipes, a sub heat transfer pipe that communicates with the first heat transfer pipe provided in the exhaust gas passage to recover the steam condensation latent heat of the combustion gas, A neutralization device that collects and neutralizes the dew condensation water generated in the sub heat transfer pipe, a sub heat transfer pipe bypass water passage that connects the outlet of the sub heat transfer pipe and the neutralization device, and a flow rate control provided in this sub heat transfer pipe bypass water passage And means for detecting the temperature inside the sub heat transfer tube.

In the above heat exchange device, the operation and effect of the first combustion section alone operation are the same as those of the first aspect, and the description thereof will be omitted here.

During independent operation of the second combustion section, the accumulated water in the sub-heat transfer tube which is not operated is heated by the combustion gas generated from the second combustion section and rises in temperature. The temperature of this accumulated water is detected by the temperature detecting means. When the temperature is detected and reaches a predetermined temperature, the flow rate control means is activated to open the sub heat transfer tube bypass water passage, and water is flowed to the neutralization device through the sub heat transfer tube bypass water passage at a predetermined flow rate so that the water in the sub heat transfer tube does not boil. Then, the water in the sub heat transfer pipe becomes fluid, and the water that has received the heat from the low-temperature combustion gas and has risen in temperature flows to the neutralization device and flows to the sewer, so that the water temperature in the sub heat transfer pipe can be controlled to a predetermined temperature. The boiling of water can be reliably prevented.

As described above, by providing the sub heat transfer tube bypass water passage which connects the outlet of the sub heat transfer tube and the neutralizing device,
When the second combustion section operates, the water temperature in the sub heat transfer tube can be controlled to a predetermined temperature by fluidizing the water in the sub heat transfer tube at a predetermined flow rate, and boiling of the water in the tube can be reliably prevented. Therefore, it is possible to provide a heat exchange device having a simple structure and capable of preventing boiling at low cost.

A heat exchange device according to an eleventh aspect of the present invention is such that a first combustion section and a second combustion section which are provided adjacent to each other, a can body provided downstream of both combustion sections, and a first transfer section provided in the can body. A heat pipe and a second heat transfer pipe, an exhaust gas passage provided on the downstream side of the both heat transfer pipes, a sub heat transfer pipe that communicates with the first heat transfer pipe provided in the exhaust gas passage to recover the steam condensation latent heat of the combustion gas, Provided in the neutralization device that collects and neutralizes the dew condensation water generated in the sub heat transfer pipe, the first heat transfer pipe bypass water passage that connects the outlet of the first heat transfer pipe and the neutralization device, and this first heat transfer pipe bypass water passage And a temperature detecting means for detecting the temperature inside the sub heat transfer tube.

In the above heat exchange device, the operation and effect of the first combustion section alone operation are the same as those of the first aspect, and the description thereof will be omitted here.

During the independent operation of the second combustion section, the accumulated water in the sub-heat transfer tube which is not operated is heated by the combustion gas generated from the second combustion section and rises in temperature. The temperature of this accumulated water is detected by the temperature detecting means. When the temperature is detected and reaches a predetermined temperature, the flow rate control means is activated to open the first heat transfer tube bypass water channel, and water is flown from the outlet of the first heat transfer tube to the neutralizer at a predetermined flow rate through the first heat transfer tube bypass water channel. Then, the water in the sub heat transfer tube and the first heat transfer tube becomes fluidized, and the water in the sub heat transfer tube that receives the heat from the combustion gas and rises in temperature flows to the first heat transfer tube and from the first heat transfer tube to the neutralizer. Since the water flows to the sewer, the water temperature can be controlled to a predetermined temperature in both the first heat transfer pipe and the sub heat transfer pipe, and boiling of the pipe water can be reliably prevented.

As described above, by providing the first heat transfer tube bypass water passage which communicates the outlet of the first heat transfer tube with the neutralization device, the water in the first heat transfer tube is also sub-transferred when the second combustion section operates. By making the water in the heat pipe fluid at a predetermined flow rate, the water temperature in the first heat transfer pipe and the sub heat transfer pipe can be controlled to a predetermined temperature, and boiling of the pipe water can be reliably prevented. Therefore, it is possible to provide a heat exchange device having a simple structure and capable of preventing boiling at low cost.

According to a twelfth aspect of the present invention, there is provided a heat exchange device in which a first combustion section and a second combustion section are provided adjacent to each other, a can body provided downstream of both combustion sections, and a first transfer section provided in the can body. The heat pipe and the second heat transfer pipe, the exhaust gas passage provided on the downstream side of the both heat transfer pipes, the plurality of sub heat transfer pipes provided on the exhaust gas passage, and the heat transfer area located on the upstream side of the exhaust gas passage. And a small heat transfer area sub heat transfer tube smaller than the sub heat transfer tube located on the downstream side.

In the above heat exchange device, since the operation and effect of the first combustion section alone operation are the same as those of claim 1, the description thereof will be omitted here.

During independent operation of the second combustion section, the accumulated water in the sub-heat transfer tube that is not operated is heated by the combustion gas generated from the second combustion section and rises in temperature. Here, the temperature of the combustion gas is relatively high. By providing a small heat transfer area auxiliary heat transfer tube with a relatively small surface heat transfer area on the upstream side of the gas passage, the heat reception from the combustion gas of this small heat transfer area auxiliary heat transfer tube is suppressed, and the upstream side of the exhaust gas passage It is possible to prevent the sub heat transfer tube arranged in the above from receiving excessive heat and locally boiling. Therefore, it is possible to provide a heat exchange device having a simple structure and capable of preventing boiling at low cost.

[0062]

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

(Embodiment 1) FIG. 1 shows a system configuration diagram of a heat exchange apparatus in Embodiment 1 of the present invention. In FIG. 1, 20 is a first combustion section, 21 is a second combustion section adjacent to the first combustion section, and a gas conduit 23 is branched into these two combustion sections, and gas cutoff valves 24 and 25 and a gas are provided respectively. Conduit 23
A gas proportional valve 26 is provided on the inlet side of the. The box-shaped can body 27 is provided downstream of the first combustion section 20 and the second combustion section 21. The first heat transfer tubes 28 penetrate the can body 27 and are provided in two stages downstream of the first combustion section 20 and the second combustion section 21, and each first heat transfer tube 28 is connected to form a single passage. There is. The second heat transfer tube 29 penetrates the can body 27 and passes through the first combustion section 20.
The second heat transfer tubes 29 are connected to each other so as to form one passage. Each of the first heat transfer tubes 28 is in contact with the adjacent second heat transfer tube 29, and the heat receiving fins 30 are fixed to the first heat transfer tube 28 and the second heat transfer tube 29 by penetration welding. 28a is the inlet of the first heat transfer tube, 28
b is the outlet of the first heat transfer tube, 29a is the inlet of the second heat transfer tube, 2
9b is an outlet of the second heat transfer tube.

The combustion fan 31 communicates with the first combustion section 20 and the second combustion section 21 via the air chamber 32. Three
3 is an exhaust gas passage provided downstream of the first heat transfer pipe 28 and the second heat transfer pipe 29, and 34 is a uniform mixing means for uniformly mixing fluids flowing through the exhaust gas passage 33 provided in the exhaust gas passage 33. A flow control plate, 35 is a sub heat transfer pipe provided on the downstream side of the flow control plate 34, and this sub heat transfer pipe 35 is a communication pipe 36.
Through the inlet 28a of the first heat transfer tube 28.
Reference numeral 35a is an inlet of the sub heat transfer pipe 35, and 37 is an exhaust gas passage 33.
It is an exhaust port communicating with the exhaust gas passage and discharging the fluid flowing through the exhaust gas passage to the outside of the heat exchange device.

The operation and action of the heat exchange device configured as described above will be described below.

During independent operation of the first combustion section, water is passed through the inlet 35a of the auxiliary heat transfer tube 35, the combustion fan 31 is driven, the gas cutoff valve 24 and the gas proportional valve 26 are opened, and the first combustion section 20 is ignited. Combustion is started by (not shown). And
The generated high-temperature combustion gas is transferred from the heat-receiving fins 30 to the preheated water flowing in the first heat transfer pipe 28, and is deprived of heat to become a low-temperature combustion gas and flows into the exhaust gas passage 33. This low-temperature combustion gas exchanges heat with the water in the auxiliary heat transfer pipe 35 in the exhaust gas passage 33 to preheat the water to become an even lower-temperature exhaust gas, and the steam in the low-temperature combustion gas is deprived of latent heat of condensation to cause sub-transfer. Condensed water is formed on the surface of the heat pipe 35. CO2 in this condensed water
Since gases such as NOx and NOx are dissolved, it is acidic (pH =
2 to 4) are shown. The generated condensed water is collected by a condensed water collecting means (not shown), flows to a neutralizing device (not shown), and is neutralized and then discharged. On the other hand, the exhaust gas that has become lower in temperature is exhausted to the atmosphere through the exhaust port 37.

On the other hand, water as a fluid to be heated is introduced into the sub heat transfer pipe 35 through the inlet 35a to remove the latent heat of steam from the low temperature combustion gas to become preheated water having a temperature slightly higher than that at the time of water supply.
It is introduced into the first heat transfer tube 28 from the inlet 28a of the first heat transfer tube through the communication tube 36. Then, this preheated water is heated to a predetermined temperature in the first heat transfer tube 28 and is discharged from the outlet 28b of the first heat transfer tube 28 as the first hot water. At that time, the gas proportional valve 26 adjusts the combustion amount of the first combustion unit 20 so as to reach the required first hot water temperature.

Next, the second operation of the second combustion unit alone will be described. When the second hot water is sucked into the second heat transfer pipe 29 by the circulation pump (not shown), the gas cutoff valve 25 and the gas proportional valve 26 are opened, and the second combustion section 21 is burned by the ignition means (not shown). To start. At that time, the gas proportional valve 26 adjusts the combustion amount so that the temperature of the required second hot water is reached. Then, the high temperature combustion gas A generated from the second combustion section 21 exchanges heat with the water in the second heat transfer tube 29 from the heat receiving fins 30 on the downstream side of the second combustion section 21, and then becomes the low temperature combustion gas A1 and the exhaust gas. It flows into the passage 33. The second hot water whose temperature has risen is driven by a circulation pump (not shown) to the outlet 2 of the second heat transfer tube 29.
9b is sent to a heat terminal (not shown) and circulated so as to return from the heat terminal to the inlet 29a of the second heat transfer tube 29.

At this time, the combustion fan 31 sends the combustion air to the second combustion section 21 through the air chamber 32, and the air-cooled air B is passed through the first combustion section 20 which is also in communication with the air chamber 32 to the can body 27. Will be sent in. Then, the air-cooled air B passes through the first heat transfer pipe 28 and the second heat transfer pipe 29, and the temperature thereof slightly rises to become warm air B1 having a relatively low temperature and flows into the exhaust gas passage 33.

The hot air B1 flowing in the position of the exhaust gas passage 33 corresponding to the first combustion section 20 is supplied to the second position by the flow adjusting plate 34 which is a uniform mixing means provided in the exhaust gas passage 33. It is deflected to the low temperature combustion gas A1 flowing through the position of the exhaust gas passage 33 corresponding to the combustion section 21, and is uniformly mixed with the low temperature combustion gas A1. Therefore, the temperature of the low temperature combustion gas A1 is lowered by being mixed with the warm air B1 so that the low temperature combustion gas A1 is cooled. Therefore, when the low temperature combustion gas A1 passes through the sub heat transfer pipe 35 provided further downstream, However, the accumulated water will not boil.

As described above, by providing the flow control plate 34, the temperature of the low temperature combustion gas A1 is lowered by mixing with the hot air B1 and the heat of the accumulated water in the sub heat transfer tube 35 is suppressed and boiling is prevented. Therefore, it is possible to provide a low-cost latent heat recovery heat exchange device with a simple configuration.

Since the first heat transfer tube 28 is in close contact with the second heat transfer tube 29 through which water flows, the heat of the accumulated water in the first heat transfer tube 28 is transferred to the second heat transfer tube through which water flows. The boiling of accumulated water can be prevented.

In the present embodiment, the flow control plate 34, which is a uniform mixing means, converts the warm air B1 into the low temperature combustion gas A1.
Although it is deflected to flow to low temperature combustion gas A1
Even if the air is deflected to the warm air B1 to flow, the same effect can be obtained.

(Embodiment 2) FIG. 2 is a system configuration diagram of a heat exchange apparatus in Embodiment 2 of the present invention. The present embodiment is different from the configuration of the first embodiment in that the bypass air passage 38 that directly connects the exhaust gas passage 33 and the air chamber 32.
And a bypass air valve 39 provided in the bypass air passage 38
That is to say. The flow control plate 34, which is the uniform mixing means used in the first embodiment, is discarded in this embodiment.

The operation and action of the heat exchange device constructed as above will be described below. The flow of combustion gas and water during the independent operation of the first combustion unit 20 or the independent operation of the second combustion unit 21 is the same as that of the first embodiment, and therefore the description thereof is omitted here.

When the second combustion section 21 operates independently, the bypass air valve 39 is opened, and the air at room temperature is supplied to the air chamber 3
2 through exhaust gas passage 33 through bypass air passage 38
Flow into. Therefore, the room temperature air C flowing into the exhaust gas passage 33 is mixed with the low temperature combustion gas A1 generated from the second combustion section 21 to cool the low temperature combustion gas A1 and lower the temperature. Therefore, the temperature of the low temperature combustion gas A1 is lowered by being mixed with the air C at room temperature to be cooled. Therefore, when the low temperature combustion gas A1 passes through the sub heat transfer tube 35 provided further downstream, it heats the accumulated water in the sub heat transfer tube 35. However, the accumulated water will not boil.

As described above, by providing the bypass air passage 38, the temperature of the low temperature combustion gas A1 is lowered by mixing with the room temperature air C, and the heat of the accumulated water in the sub heat transfer tube 35 is suppressed and boiling is prevented. Therefore, it is possible to provide a low-cost latent heat recovery heat exchange device with a simple configuration.

Further, in the present embodiment, since the pressure of the air chamber 32 is higher than the pressure of the exhaust gas passage 33, the low temperature combustion gas A1 and It is more preferable for practical use because the temperature of the low temperature combustion gas A1 can be lowered by mixing well and a small amount of air.

(Embodiment 3) FIG. 3 is a system configuration diagram of a heat exchange apparatus in Embodiment 3 of the present invention. In this embodiment, the difference from the configuration of the first embodiment is that an ambient air flow passage 40 is provided around the inside of the can body 27 and communicates with the air chamber 32.
That is, the exhaust gas passage 33 is provided with the flow guide 41 which is a flow adjusting means for allowing the air flowing through the ambient air passage to flow into the exhaust gas passage. The flow control plate 34, which is the uniform mixing means used in the first embodiment, is discarded in this embodiment.

The operation and action of the heat exchange device constructed as above will be described below. The flow of combustion gas and water during the independent operation of the first combustion unit 20 or the independent operation of the second combustion unit 21 is the same as that of the first embodiment, and therefore the description thereof is omitted here.

When the second combustion section 21 operates independently, ambient temperature air is sent from the driving of the combustion fan 31 to the ambient air flow passage 40 that communicates with the air chamber 32 provided around the can body 27. The room temperature air passes along the inner wall of the can body 27 and passes through the ends of the first heat transfer tube 28 and the second heat transfer tube portion 29 and passes through the can body 27.
While flowing into the exhaust gas passage 33 while cooling the wall. The ambient air D flowing through the exhaust gas passage 33 flows toward the inside of the exhaust gas passage 33 due to the direction regulation of the flow guide 41, which is a flow adjusting means. Low temperature combustion gas A1 generated from
It is possible to further lower the temperature of the combustion gas by mixing with, and it is possible to prevent boiling of accumulated water in the sub heat transfer tube 35.

As described above, by providing the flow guide 41 which is a flow adjusting means for allowing the air flowing through the ambient air flow path 40 to flow into the exhaust gas passage 33,
Ambient air D and low temperature combustion gas A flowing through the exhaust gas passage 33
1 can be mixed with 1 to lower the temperature of the combustion gas, and the heat of the accumulated water in the sub heat transfer pipe 35 can be suppressed to prevent boiling. Therefore, a simple structure and low cost heat exchange capable of preventing boiling A device can be provided.

Further, in the present embodiment, a part of the air supplied by the operating combustion fan 31 is guided to the ambient air passage 40, and by the direction regulation of the flow guide 41, it is well mixed with the low temperature combustion gas A1 and special air is blown. Since the temperature of the low temperature combustion gas A1 can be lowered without any means, it is more practically preferable.

(Embodiment 4) FIG. 4 is a system configuration diagram of a heat exchange apparatus in Embodiment 4 of the present invention. In the present embodiment, the difference from the configuration of the first embodiment is a flow damper 42 for adjusting the flow direction of the combustion gas flowing through the exhaust gas passage 33 in the exhaust gas passage 33, and a drive means for controlling this flow damper 42. The rotation motor 43 is provided. The flow control plate 34, which is the uniform mixing means used in the first embodiment, is discarded in this embodiment.

In the above heat exchange device, the first combustion section 2
Since the flow of the combustion gas and the water is the same as that of the first embodiment during the 0 independent operation or the second combustion unit 21 alone operation, the description thereof is omitted here.

In the second combustion section alone operation, the exhaust gas passage 33
Since the direction of the flow damper 42 is changed by the rotary motor 43 which is a driving means, the low temperature combustion gas A1 is controlled by controlling the flow direction of the low temperature combustion gas A1 flowing through the exhaust gas passage 33. The sub heat transfer tube 3 without heating only the local portion of the sub heat transfer tube 35.
Since the whole of No. 5 can be heated uniformly, the temperature rise of the accumulated water in the sub heat transfer tube 35 can be suppressed, and boiling can be prevented.

As described above, by changing the direction of the flow damper 42 by using the rotary motor 43, the low temperature combustion gas A1 does not heat only the local portion of the sub heat transfer tube 35, and the entire sub heat transfer tube 35 is made uniform. Since it can be heated to a high temperature and the temperature rise of the accumulated water in the sub heat transfer tube 35 can be suppressed, it is possible to provide a heat exchange device having a simple structure and capable of preventing boiling at a low cost.

(Embodiment 5) FIG. 5 is a system configuration diagram of a heat exchange apparatus in Embodiment 5 of the present invention. This embodiment is different from the structure of the first embodiment in that the sub heat transfer pipe 35
That is, a staying water temperature sensor 44 for measuring the staying water temperature therein and a combustion amount limiting means 45 for limiting the maximum combustion amount of the second combustion portion to a predetermined combustion amount are provided. The flow control plate 34, which is the uniform mixing means used in the first embodiment, is discarded in this embodiment.

In the above heat exchange device, the first combustion section 2
Since the flow of the combustion gas and the water is the same as that of the first embodiment during the 0 independent operation or the second combustion unit 21 alone operation, the description thereof is omitted here.

During the independent operation of the second combustion section, the accumulated water in the sub heat transfer tube 29 which is not operated is heated by the low temperature combustion gas A1 generated from the second combustion section 21 and its temperature rises. Then, when the temperature of the accumulated water is detected by the accumulated water temperature sensor 44 and reaches a predetermined maximum temperature, a regulation signal is sent to the combustion amount limiting means 45 so that the combustion amount of the second combustion section 21 makes the accumulated water reach the prescribed maximum temperature. By squeezing so as not to become, it is possible to reliably prevent boiling of the accumulated water.

As described above, the maximum combustion amount of the second combustion section 21 is limited by using the combustion amount limiting means 45.
Since the accumulated water in the sub heat transfer tube can be surely not boiled, it is possible to provide a heat exchange device which has a simple structure and can reliably prevent boiling at low cost.

In this embodiment, the accumulated water temperature sensor 44 is used to detect the temperature of the accumulated water and the maximum combustion amount is limited by the combustion amount limiting means 45.
Even if the proportional valve 26 is used in advance, the maximum combustion amount of the second combustion section can be similarly limited, and the same effect can be obtained.

(Embodiment 6) FIG. 6 is a system configuration diagram of a heat exchange apparatus in Embodiment 6 of the present invention. This embodiment is different from the structure of the first embodiment in that the sub heat transfer pipe 35
The circulation passage 46 that connects the inlet 35 a of the first heat transfer tube 28 to the outlet 28 b of the first heat transfer tube 28, and the circulation pump 47 are provided in the circulation passage 46. The flow control plate 34, which is the uniform mixing means used in the first embodiment, is discarded in this embodiment.

The operation and action of the heat exchange device constructed as above will be described below. The flow of combustion gas and water during the independent operation of the first combustion unit 20 or the independent operation of the second combustion unit 21 is the same as that of the first embodiment, and therefore the description thereof is omitted here.

When the second combustion unit is operated independently, the inlet 35a of the sub heat transfer tube 35 and the first heat transfer tube 2 are circulated by the circulation passage 46.
Since the circulation circuit is constructed by communicating with the outlet 28b of the No. 8 outlet, the circulating water in the sub-heat transfer pipe 35 and the first heat transfer pipe 28 is driven and forcedly circulated by using the circulation pump 47 provided in the circulation passage 46. You can Then, the retained water that has received the heat of the combustion gas in the sub heat transfer pipe 35 and the first heat transfer pipe 28 and has a temperature rise is forcibly circulated, and the heat is radiated in the circulation passage 46 to lower the temperature and prevent boiling.

As described above, the circulation passage 46 makes the first heat transfer pipe 28 and the sub heat transfer pipe 35 into a circulation circuit, and the circulation pump 4
By forcibly driving the accumulated water therein by using No. 7, the accumulated water whose temperature has risen radiates heat in the circulation passage 46 and the temperature rise can be suppressed, so that the temperature of the accumulated water in the first heat transfer pipe 28 also increases. It is possible to provide a heat exchange device capable of preventing boiling by lowering the temperature of the accumulated water in 35 to prevent boiling and having a simple structure and capable of preventing boiling at low cost.

In the present embodiment, the circulation passage 46 which connects the inlet 35a of the sub heat transfer tube 35 and the outlet 28b of the first heat transfer tube 28 is used, but the inlet 35a of the sub heat transfer tube 35 and the sub heat transfer tube 35 are connected to each other. Even if the outlet 35b is communicated with the circulation passage, the same effect can be obtained.

(Embodiment 7) FIG. 7 is a system configuration diagram of a heat exchange apparatus in Embodiment 7 of the present invention. This embodiment is different from the structure of the first embodiment in that the sub heat transfer pipe 35
The main stop valve 48 provided at the inlet 35a of the above, the drainage passage 49 provided at the outlet 35b of the sub heat transfer tube 35, and the drainage on-off valve 50 provided at the drainage passage 49 are provided. In addition,
The flow control plate 34, which is the uniform mixing means used in the first embodiment, is discarded in this embodiment.

The operation and action of the heat exchange device configured as described above will be described below. The flow of combustion gas and water during the independent operation of the first combustion unit 20 or the independent operation of the second combustion unit 21 is the same as that of the first embodiment, and therefore the description thereof is omitted here.

During the second combustion section alone operation, the stop valve 48 provided at the inlet 35a of the sub heat transfer tube 35 is actuated to close the inlet of the sub heat transfer tube 35, and then the drainage on-off valve is opened. The accumulated water in the sub heat transfer pipe 35 is drained through the drainage passage 49. Therefore, since the combustion gas generated from the second combustion section 21 is heated in a state where the sub heat transfer tube 35 is emptied, the second combustion section 21 alone can be operated without fear of boiling water in the tube.

As described above, the stop valve 48 and the drainage passage 49 are provided.
By using, the sub heat transfer pipe 35 is heated by the combustion gas with the accumulated water being removed. Here, the sub heat transfer pipe 35 made of a corrosion resistant material such as titanium or stainless steel can withstand the heating to the combustion gas without accumulated water. As described above, it is possible to provide a heat exchange device that has a simple structure and can prevent boiling at low cost without worrying about boiling of accumulated water.

(Embodiment 8) FIG. 8 is a system configuration diagram of a heat exchange apparatus in Embodiment 8 of the present invention. In the present embodiment, the difference from the configuration of the first embodiment is that a passing exhaust passage 51 in which the auxiliary heat transfer tubes 35 are not arranged is provided at a position in the exhaust gas passage 33 corresponding to the second combustion portion 21. is there. Further, in the present embodiment, the axial direction of the sub heat transfer tube 35 is arranged so as not to coincide with the axial directions of the first heat transfer tube 28 and the second heat transfer tube 29 and to intersect with each other. The flow control plate 34, which is the uniform mixing means used in the first embodiment, is discarded in this embodiment.

The operation and action of the heat exchange device configured as described above will be described below. The flow of combustion gas and water during the independent operation of the first combustion unit 20 or the independent operation of the second combustion unit 21 is the same as that of the first embodiment, and therefore the description thereof is omitted here.

When the second combustion section is operated independently, the exhaust gas passage 33 is provided in the exhaust gas passage 33 at a position corresponding to the second combustion section 21. Second combustion section 21 flowing through passage 33
Since the low temperature combustion gas A1 generated from the exhaust gas can be discharged from the exhaust passage 51 without passing through the auxiliary heat transfer pipe 35, the accumulated water in the auxiliary heat transfer pipe 35 avoids heat exchange with the combustion gas and is retained water. It is possible to surely prevent boiling without increasing the temperature of.

As described above, by providing the passing exhaust passage 51 in which the auxiliary heat transfer tubes 35 are not arranged in the exhaust gas passage 33 at a position corresponding to the second combustion portion 21, the exhaust passage dedicated to the first combustion portion is provided. It is possible to provide a heat exchange device with a simple structure and capable of preventing boiling at low cost, without separately providing a passage dedicated to the second combustion unit.

(Ninth Embodiment) FIG. 9 is a system configuration diagram of a heat exchange device in a ninth embodiment of the present invention. This embodiment is different from the structure of the first embodiment in that the sub heat transfer pipe 35
Neutralizing device 52 for collecting and neutralizing the dew condensation water generated in the above, a bypass shower water channel 53 provided on the inlet 35a side of the sub heat transfer tube 35, a flow rate control means 54 provided in this bypass shower water channel 53, That is, the temperature detecting means 55 for detecting the water temperature in the heat transfer tube 35 and the outlet 56 for communicating with the bypass shower water passage 53 and for spraying water on the surface of the sub heat transfer tube 35 are provided. Further, 57 is a neutralization outlet for discharging water in the neutralization device 52. The flow control plate 34, which is the uniform mixing means used in the first embodiment, is discarded in this embodiment.

The operation and action of the heat exchange device configured as described above will be described below. The flow of combustion gas and water during the independent operation of the first combustion unit 20 or the independent operation of the second combustion unit 21 is the same as that of the first embodiment, and therefore the description thereof is omitted here.

When the second combustion section is operated independently, the accumulated water in the sub heat transfer tube 35 which is not operated is heated by the combustion gas generated from the second combustion section 21 and its temperature rises. When the temperature is detected by the detection means 55 and reaches a predetermined temperature, the flow rate control means 54 operates to open the bypass shower water passage 53 and jet water from the outflow port 56. The jetted water exchanges heat with the combustion gas and the sub heat transfer pipe 35 whose temperature has risen, cools the accumulated water, and then flows into the neutralization device 52 and is discharged through the neutralization outlet 57. It becomes possible to prevent boiling of the accumulated water by such cooling means.

As described above, by spraying water to the sub heat transfer pipe 35 whose temperature has risen by using the bypass shower water passage 53, the temperature rise of the accumulated water can be suppressed to a predetermined temperature or less, and boiling can be reliably prevented, and at the same time, the sub heat transfer pipe can be prevented. The water sprayed on the surface of the sub-heat pipe 35 is washed away by removing dust and other adhered substances adhering to the surface of the sub-heat transfer pipe 35 by the operation of the first combustion section or the like.
Since the surface of the sub-heat transfer tube 35 can be cleaned, the performance of the sub heat transfer tube 35 can be maintained and durability can be maintained even when the first combustion section is operating.

(Embodiment 10) FIG. 10 shows Embodiment 1 of the present invention.
It is a system block diagram of the heat exchange apparatus in 0. In this embodiment, the difference from the configuration of the first embodiment is a neutralization device 58 for collecting and neutralizing the dew condensation water generated in the sub heat transfer tube,
An auxiliary heat transfer tube bypass water channel 59 that communicates the outlet 35b of the auxiliary heat transfer tube 35 and the neutralization device 58, a flow rate control means 60 provided in the auxiliary heat transfer tube bypass water channel 59, and the accumulated water temperature in the auxiliary heat transfer tube 35 are detected. The temperature detecting means 61 is provided. The flow control plate 34, which is the uniform mixing means used in the first embodiment, is discarded in this embodiment.

The operation and action of the heat exchange device configured as described above will be described below. The flow of combustion gas and water during the independent operation of the first combustion unit 20 or the independent operation of the second combustion unit 21 is the same as that of the first embodiment, and therefore the description thereof is omitted here.

When the second combustion section is operated independently, the accumulated water in the sub heat transfer tube 35 which is not operated is heated by the combustion gas generated from the second combustion section 21 and its temperature rises. When the temperature is detected by the means 61 and reaches a predetermined temperature, the flow rate control means 60 operates to open the sub heat transfer tube bypass water channel 59, and the sub heat transfer tube bypass water channel 59 is controlled at a predetermined flow rate so that the water in the sub heat transfer tube 35 does not boil. Through the neutralizer 58. Then, the water in the sub heat transfer tube 35 becomes fluid, and the water that has received the heat from the low temperature combustion gas A1 and whose temperature has risen flows to the neutralization device 58 and flows to the sewer. It is possible to control even up to boiling water in the pipe.

As described above, by providing the sub heat transfer tube bypass water passage 59 that connects the outlet 35b of the sub heat transfer tube 35 and the neutralization device 58, when the second combustion section 21 operates independently,
By making the water in the sub heat transfer tube 35 fluid at a predetermined flow rate, the water temperature in the sub heat transfer tube 35 can be controlled to a predetermined temperature, and boiling of the water in the tube can be reliably prevented. Therefore, it is possible to provide a heat exchange device having a simple structure and capable of preventing boiling at low cost.

(Embodiment 11) FIG. 11 shows Embodiment 1 of the present invention.
2 is a system configuration diagram of the heat exchange device in FIG. The present embodiment is different from the configuration of the first embodiment in that the neutralization device 62 that collects and neutralizes the dew condensation water generated in the sub heat transfer tube 35.
A first heat transfer tube bypass water passage 63 that communicates the outlet 28b of the first heat transfer tube 28 with the neutralization device 62; a flow rate control means 64 provided in the first heat transfer tube bypass water passage 63; That is, the temperature detecting means 65 for detecting the water temperature is provided. The flow control plate 34, which is the uniform mixing means used in the first embodiment, is discarded in this embodiment.

The operation and action of the heat exchange device configured as above will be described below. The flow of combustion gas and water during the independent operation of the first combustion unit 20 or the independent operation of the second combustion unit 21 is the same as that of the first embodiment, and therefore the description thereof is omitted here.

When the second combustion section is operated independently, the accumulated water in the sub heat transfer tube 35 which is not operated is heated by the combustion gas generated from the second combustion section 21 and its temperature rises. When the temperature is detected using the means 65 and reaches a predetermined temperature, the flow rate control means 64 operates to open the first heat transfer tube bypass water passage 63, and the first heat transfer tube 28 has an outlet 28b at a predetermined flow rate through the first heat transfer tube bypass water passage 63. Water is supplied to the neutralizer 62. Then, the water in the sub heat transfer tube 35 and the first heat transfer tube 28 becomes a fluid, and the water in the sub heat transfer tube 35 which has received the heat from the low temperature combustion gas A1 and has increased in temperature flows to the first heat transfer tube 28,
Then, since it flows from the first heat transfer pipe 28 to the neutralization device 62 and flows into the sewer, the sub heat transfer pipe 3 also flows inside the first heat transfer pipe 28.
Even within 5, the water temperature can be controlled to a predetermined temperature and the boiling of water in the pipe can be reliably prevented.

In this way, the outlet 28b of the first heat transfer tube 28
First heat transfer tube bypass water passage 63 that communicates with the neutralization device 62
By providing, when the second combustion unit 21 operates,
By making both the water in the first heat transfer tube 28 and the water in the sub heat transfer tube 35 fluid at a predetermined flow rate, the water temperature in the first heat transfer tube 28 and the sub heat transfer tube 35 can be controlled to a predetermined temperature, and boiling of water in the tube can be controlled. It can be surely prevented. Therefore, it is possible to provide a heat exchange device having a simple structure and capable of preventing boiling at low cost.

(Embodiment 12) FIG. 12 shows Embodiment 1 of the present invention.
2 is a system configuration diagram of the heat exchange device in FIG. In the present embodiment, the difference from the configuration of the first embodiment is that a small heat transfer area sub heat transfer pipe 66 that is located upstream of the exhaust gas passage 33 and has a heat transfer area smaller than the sub heat transfer pipe 35 located downstream.
Is provided.

The operation and action of the heat exchange device configured as above will be described below. The flow of combustion gas and water during the independent operation of the first combustion unit 20 or the independent operation of the second combustion unit 21 is the same as that of the first embodiment, and therefore the description thereof is omitted here.

During the second combustion section alone operation, the accumulated water in the sub heat transfer tubes 35 and 66 which are not operated is heated by the low temperature combustion gas A1 generated from the second combustion section 21 and rises in temperature. By providing a small heat transfer area sub heat transfer tube 66 having a relatively small surface heat transfer area on the upstream side of the exhaust gas passage 33 where the temperature of the combustion gas A1 is relatively high, the combustion gas of the small heat transfer area sub heat transfer tube 66 is It is possible to prevent the sub heat transfer pipe arranged on the upstream side of the exhaust gas passage 33 from receiving excessive heat and locally boiling by suppressing the heat reception of the above. Therefore, it is possible to provide a heat exchange device having a simple structure and capable of preventing boiling at low cost.

In each of the above-mentioned embodiments, the first combustion section and the second combustion section have been described as independent combustion, respectively, but when the first combustion section and the second combustion section simultaneously burn, the auxiliary heat transfer tube and the (1) Passing water through the heat transfer tube, without passing through the second heat transfer tube, as in the independent operation of the first combustion section, the latent heat of steam condensation in the combustion gas in the sub heat transfer tube can be recovered. Similar effects are obtained.

[0122]

As described above, according to the present invention, it is possible to provide a low-cost latent heat recovery heat exchange device with a simple configuration that does not cause boiling of accumulated water in the latent heat transfer tube for hot water supply.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a heat exchange device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a heat exchange device according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a heat exchange device according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a heat exchange device according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram of a heat exchange device according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram of a heat exchange device according to a sixth embodiment of the present invention.

FIG. 7 is a configuration diagram of a heat exchange device according to a seventh embodiment of the present invention.

FIG. 8 is a configuration diagram of a heat exchange device according to an eighth embodiment of the present invention.

FIG. 9 is a configuration diagram of a heat exchange device according to a ninth embodiment of the present invention.

FIG. 10 is a configuration diagram of a heat exchange device according to a tenth embodiment of the present invention.

FIG. 11 is a configuration diagram of a heat exchange device according to an eleventh embodiment of the present invention.

FIG. 12 is a configuration diagram of a heat exchange device according to a twelfth embodiment of the present invention.

FIG. 13 is a configuration diagram of a conventional heat exchange device.

[Explanation of symbols]

20 First combustion section 21 Second combustion section 27 cans 28 First heat transfer tube 29 Second heat transfer tube 33 Exhaust gas passage 34 Flow control plate (uniform mixing means) 35 Sub heat transfer tube 38 Bypass air passage 39 Bypass air valve 40 ambient air flow path 41 Flow guide (flow control means) 42 flow damper 43 rotary motor (driving means) 45 Combustion amount limiting means 46 Circulation passage 47 Circulation pump 48 yuan stop valve 49 drainage passage 51 street exhaust passage 52,58,62 Neutralizer 53 Bypass shower channel 54 Temperature detection means 55 Flow rate control means 56 Outlet 59 Sub heat transfer pipe bypass channel 60 Flow control means 61 Temperature detecting means 63 First heat transfer pipe bypass channel 64 flow control means 65 Temperature control means 66 Small heat transfer area Sub heat transfer tube

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masamitsu Kondo             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 3L036 AA04                 3L103 AA42 BB43 CC02 CC27 DD09

Claims (12)

[Claims] 1. A first combustion section and a second combustion section provided adjacent to each other, a can body provided downstream of both combustion sections, and a first heat transfer tube and a second heat transfer tube provided in the can body. An exhaust gas passage provided on the downstream side of both heat transfer tubes, a uniform mixing means provided on the exhaust gas passage for uniformly mixing fluids flowing through the exhaust gas passage, and a sub-stream provided on the downstream side of the uniform mixing means. A heat exchange device comprising a heat transfer tube. 2. A first combustion section and a second combustion section provided adjacent to each other, an air chamber for supplying combustion air provided on the upstream side of the both combustion sections, and a downstream side of the both combustion sections. A can body, a first heat transfer tube and a second heat transfer tube provided in the can body, an exhaust gas passage provided at a downstream side of the both heat transfer tubes, a sub heat transfer tube provided in the exhaust gas passage, and the exhaust gas. A heat exchange device comprising a gas passage and a bypass air passage which directly connects the air chamber. 3. A first combustion section and a second combustion section provided adjacent to each other, an air chamber for supplying combustion air provided on the upstream side of the both combustion sections, and a downstream side of the both combustion sections. A can body, a first heat transfer tube and a second heat transfer tube provided in the can body, an ambient air flow path that is provided around the can body and communicates with the air chamber, and is provided on the downstream side of both the heat transfer tubes. An exhaust gas passage, a sub heat transfer pipe provided in the exhaust gas passage, and a flow adjusting means for allowing the air flowing through the ambient air passage to flow in the exhaust gas passage into the exhaust gas passage. Exchange device. 4. A first combustion section and a second combustion section provided adjacent to each other, an air chamber for supplying combustion air provided on the upstream side of the both combustion sections, and a downstream side of the both combustion sections. A can body, a first heat transfer tube and a second heat transfer tube provided in the can body,
An exhaust gas passage provided on the downstream side of the both heat transfer pipes, a sub heat transfer pipe provided in the exhaust gas passage, and a flow damper provided in the exhaust gas passage for adjusting a flow direction of combustion gas flowing through the exhaust gas passage. A heat exchange device comprising: a drive means for controlling the flow damper. 5. A first combustion section and a second combustion section provided adjacent to each other, a can body provided downstream of both combustion sections, and a first heat transfer tube and a second heat transfer tube provided in the can body. A heat provided with an exhaust gas passage provided on the downstream side of the both heat transfer pipes, a sub heat transfer pipe provided in the exhaust gas passage, and a combustion amount limiting means for limiting the maximum combustion amount of the second combustion section. Exchange device. 6. A first combustion section and a second combustion section provided adjacent to each other, a can body provided downstream of both combustion sections, and a first heat transfer tube and a second heat transfer tube provided in the can body. An exhaust gas passage provided on the downstream side of the both heat transfer tubes, a sub heat transfer tube communicating with the first heat transfer tube provided on the exhaust gas passage, an inlet side of the sub heat transfer tube and the first heat transfer tube A heat exchange device comprising: a circulation passage communicating with the outlet side; and a circulation pump provided in the circulation passage. 7. A first combustion section and a second combustion section provided adjacent to each other, a can body provided downstream of both combustion sections, and a first heat transfer tube and a second heat transfer tube provided in the can body. An exhaust gas passage provided on the downstream side of both heat transfer tubes, a sub heat transfer tube communicating with the first heat transfer tube provided in the exhaust gas passage, and a stop valve provided at an inlet of the sub heat transfer tube, A heat exchange device comprising: a drainage passage provided at an outlet of the sub heat transfer tube. 8. A first combustion section and a second combustion section provided adjacent to each other, a can body provided downstream of the both combustion sections, and a first heat transfer tube and a second heat transfer tube provided in the can body. Corresponding to an exhaust gas passage provided on the downstream side of the both heat transfer pipes, a sub heat transfer pipe communicating with the first heat transfer pipe provided in the exhaust gas passage, and the second combustion section in the exhaust gas passage. A heat exchanging device comprising: a through-passage exhaust passage in which the sub heat transfer pipes are not arranged. 9. A first combustion section and a second combustion section provided adjacent to each other, a can body provided downstream of the both combustion sections, and a first heat transfer tube and a second heat transfer tube provided in the can body. An exhaust gas passage provided on the downstream side of the both heat transfer pipes, a sub heat transfer pipe communicating with the first heat transfer pipe provided in the exhaust gas passage to recover the steam condensation latent heat of the combustion gas, and the sub heat transfer pipe. A neutralizer for collecting and neutralizing the generated dew condensation water, a bypass shower water channel provided on the inlet side of the auxiliary heat transfer tube, a flow rate control means provided in the bypass shower water channel, and a temperature inside the auxiliary heat transfer tube. A heat exchange device comprising temperature detecting means for detecting, and an outlet for communicating with the bypass shower water passage and for spraying water on the surface of the sub heat transfer pipe. 10. A first combustion section and a second combustion section provided adjacent to each other, a can body provided downstream of the both combustion sections, and a first heat transfer tube and a second heat transfer tube provided in the can body. An exhaust gas passage provided on the downstream side of the both heat transfer tubes, a sub heat transfer tube that communicates with the first heat transfer tube provided in the exhaust gas passage to recover the steam condensation latent heat of the combustion gas, and the sub heat transfer tube. A neutralization device that collects and neutralizes the generated dew condensation water, an auxiliary heat transfer pipe bypass water passage that connects the outlet of the auxiliary heat transfer pipe and the neutralization device, and a flow rate control means provided in the auxiliary heat transfer pipe bypass water passage. A heat exchange device comprising a temperature detecting means for detecting the temperature inside the sub heat transfer tube. 11. A first combustion section and a second combustion section provided adjacent to each other, a can body provided downstream of both combustion sections, and a first heat transfer tube and a second heat transfer tube provided in the can body. An exhaust gas passage provided on the downstream side of the both heat transfer pipes, a sub heat transfer pipe communicating with the first heat transfer pipe provided in the exhaust gas passage to recover the steam condensation latent heat of the combustion gas, and the sub heat transfer pipe. A neutralization device that collects and neutralizes the generated dew condensation water, a first heat transfer tube bypass water channel that connects the outlet of the first heat transfer tube and the neutralization device,
Flow rate control means provided in the first heat transfer tube bypass water channel,
A heat exchange device comprising: a temperature detection unit that detects the temperature inside the sub heat transfer tube. 12. A first combustion section and a second combustion section provided adjacent to each other, a can body provided downstream of the both combustion sections, and a first heat transfer tube and a second heat transfer tube provided in the can body. An exhaust gas passage provided on the downstream side of the both heat transfer pipes, a plurality of sub heat transfer pipes provided on the exhaust gas passage, and the heat transfer area located on the upstream side of the exhaust gas passage and on the downstream side. A heat exchange device having a small heat transfer area smaller than the sub heat transfer tube and the sub heat transfer tube.