JP2004061069A - Latent heat recovery type heat source machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a latent heat recovery type heat source machine preventing waste gas drain, which may remain during a combustion test, from flowing out to a combustion burner side even if an attitude is changed to a horizontal one or causing no problem even when the waste gas drain flows out. <P>SOLUTION: Latent heat of the waste gas led to an inner space 99 from a primary heat exchanger 3 via an exhaust passage 5a and an upper opening 96 is collected by a secondary heat exchanger 4, and then, discharged from an exhaust outlet 97. Even if the waste gas drain, which is not discharged from a drain collection pipe 81 and sticks and remains on the secondary heat exchanger 4 in the combustion test before shipping of a product, flows down to the primary heat exchanger side from an exhaust passage according to an attitude change of an apparatus to a horizontal condition from a vertical condition, the waste gas drain is brought into contact with a neutralization film 11 consisting essentially of a neutralizer to be treated with neutralization, while the waste gas drain is blocked by a weir 98 to be prevented from flowing down further. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a latent heat recovery type heat source device provided with a latent heat recovery heat exchanger, and more particularly to a latent heat recovery type heat source device which takes measures against exhaust gas drain generated in the latent heat recovery heat exchanger.
[0002]
[Prior art]
Conventionally, for example, a latent heat recovery type heat source device as shown in FIG. 6 has been known. In this device, a primary heat exchanger 3 that is heat-exchanged and heated by the combustion heat of a combustion burner 2 and a secondary heat exchanger 4a for recovering latent heat are provided in a can body 5, and water input from a water supply pipe 6 is provided. First, the fuel gas is passed through the secondary heat exchanger 4a and preheated by the latent heat of the combustion exhaust gas, and then passed through the primary heat exchanger 3 and heated by the combustion heat from the combustion burner 2, and then discharged into the tapping pipe 7. And use it for hot water supply. That is, the latent heat of the combustion exhaust gas is also recovered to improve the efficiency. Then, the strongly acidic exhaust gas drain generated by the heat exchange with the latent heat in the secondary heat exchanger 4a is collected in the neutralization tank 8 through the drain water collecting pipe 81, and the neutralizing agent filled in the neutralization tank 8 is used. After the neutralization treatment, the water is drained outside the machine.
[0003]
[Problems to be solved by the invention]
By the way, in the latent heat recovery type heat source device as described above, after the assembly is completed on the production line, before the product is shipped as a product, the combustion test is usually performed by burning the combustion burner 2 as a completion inspection. At the time of this inspection, since water is passed through each heat exchanger and the combustion burner 2 is actually burned, a small amount (for example, 30 to 70 mL) of exhaust gas drain is generated.
[0004]
For example, as shown in a specific example of the latent heat recovery type heat source unit on the left side of FIG. 7, when the combustion burner 2 is actually burned, the combustion exhaust gas passing through the primary heat exchanger 3 (the dashed line in FIG. (See arrow) is guided to the exhaust pipe 9 along the exhaust passage 51, and when passing through the secondary heat exchanger 4 a installed in the exhaust pipe 9, the latent heat of the combustion exhaust gas and the internal heat of the secondary heat exchanger 4 a Condensation occurs on the surface of the secondary heat exchanger 4a due to heat exchange with water, and exhaust gas drain is generated. This exhaust gas drain flows along the bottom wall 91 of the exhaust pipe 9 into the inlet of the drain water collecting pipe 81 and flows down to the neutralization tank 8.
[0005]
However, in this case, it is conceivable that a part of the exhaust gas drain remains on the surface of the secondary heat exchanger 4a without being dropped by gravity due to surface tension. In particular, when a secondary heat exchanger having external fins is used, if the fin pitch is narrow, the surface tension tends to increase, and the possibility of the exhaust gas drain remaining increases.
[0006]
Normally, the above-mentioned latent heat recovery type heat source device is packed upright in an upright state (the state shown on the left side of FIG. 7) and covered with cushioning materials H, H, etc., and stored and transported in this upright state. Even when the exhaust gas drain remains due to lateral holding at the installation site, and the exhaust gas drain falls due to vibration during transportation, etc., any inconvenience occurs because the exhaust gas drain flows down into the drain collecting pipe 81. Does not occur.
[0007]
However, after the above inspection, in the process of storage or transportation until the final installation in the house or the like in the upright state, the latent heat recovery type heat source machine is turned over due to unexpected overturning or mishandling ( It is also conceivable that it is left as it is (the state shown on the right side of FIG. 7). If left sideways, the remaining exhaust gas drain may flow out of the exhaust pipe 9 into the exhaust passage 51 and adhere to the combustion burner 2 and other functional components. Then, when the exhaust gas drain adheres, the exhaust gas drain is strongly acidic, which causes a problem of causing corrosion.
[0008]
The present invention has been made in view of such circumstances, and an object of the present invention is to prevent exhaust gas drain that may remain at the time of inspection even if it is placed sideways from flowing out to the combustion burner side. Another object of the present invention is to provide a latent heat recovery type heat source device capable of preventing inconvenience even if the heat flows out.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, in the following inventions, a latent heat recovery heat exchanger disposed in a flue gas exhaust passage to exchange heat with the flue gas and recover the latent heat of the flue gas is provided. The following specific items will be provided for the latent heat recovery type heat source equipment provided.
[0010]
That is, in the invention according to claim 1, when the attitude of the heat source device main body is changed from the erect state to the sideways state, at least the exhaust gas drain of the exhaust gas drain is generated along with the attitude change among the wall surfaces constituting the discharge passage. A neutralizing agent for neutralizing the exhaust gas drain is adhered to and held in the wall region to be changed in posture so as to flow downward by gravity toward the upstream side so as to be able to contact the exhaust gas drain flowing down. And
[0011]
In the case of claim 1, a small amount of exhaust gas drain remains in the exhaust passage by the combustion inspection before the product is shipped, and the heat source unit main body is in the original erect state from the time of product shipment until the product is actually installed. Even if an unexpected situation occurs in which the attitude of the exhaust gas is changed to the sideways state from the side, the remaining exhaust gas drain flows down toward the upstream side of the discharge passage, and the exhaust gas drain tends to flow down due to the attitude change. Since the neutralizing agent is attached and held in the region, the exhaust gas drain contacts the neutralizing agent and is neutralized. Therefore, even if the drain water that has become neutral after the neutralization further flows down, there is no problem of corrosion.
[0012]
Here, the above-mentioned "adhering and holding in contact with the exhaust gas drain" means, for example, dissolving a powdery or fine-grained neutralizing agent in water or the like and brush-coating or spray-coating the surface of a predetermined wall region. (2) forming a film containing a neutralizing agent as a main component by applying and drying, or filling predetermined granules in a mesh-like or porous container and attaching it. The same applies to claim 3).
[0013]
Further, in the invention according to claim 2, when the attitude of the heat source device main body is changed from the erect state to the sideways state, at least the exhaust gas drain of the exhaust gas drain is generated along with the attitude change among the wall surfaces constituting the discharge passage. A weir wall is provided to protrude so as to block the exhaust gas drain flowing down in the sideways state with respect to the wall surface region that is to be changed in posture so as to flow down by the action of gravity toward the upstream side.
[0014]
In the case of the second aspect, as described above, a small amount of exhaust gas drain remains in the exhaust passage by the combustion inspection before the product is shipped, and the heat source unit main body is in its original correct state from the time of product shipment until it is actually installed. An unexpected situation occurs that the posture is changed from the standing state to the sideways state, and even if the residual exhaust gas drain tries to flow down by gravity due to the upstream side of the discharge passage, the exhaust gas drain is changed by the above posture conversion. Since the weir wall is provided in the wall area to be flown down, the exhaust gas drain is blocked by the weir wall and further flow down is prevented. For this reason, it is possible to avoid the possibility of occurrence of corrosion of functional components and the like in the heat source device due to the strongly acidic exhaust gas drain flowing down the upstream side of the discharge passage.
[0015]
Further, in the invention according to claim 3, when the attitude of the heat source device main body is changed from the erect state to the sideways state, at least the exhaust gas drain is generated by the exhaust gas drain along with the attitude change among the wall surfaces constituting the discharge passage. A neutralizing agent for neutralizing the exhaust gas drain is adhered to and held in contact with the flowing exhaust gas drain on a wall surface region that is to be changed in attitude so that the air flows downward due to gravity toward the upstream side. Further, a weir wall is provided so as to protrude so as to dam the exhaust gas drain flowing down in the sideways state.
[0016]
In the case of the third aspect, the neutralizing agent is adhered and held in the wall surface area and the weir wall is provided, so that both actions according to the first and second aspects are exhibited, and the unexpected Even if the above situation occurs, both neutralization of the exhaust gas drain by the neutralizing agent and prevention of the exhaust gas drain from flowing down are achieved. In this case, by providing the weir wall at a position on the upstream side of the wall surface region where the neutralizing agent is attached and held, it is possible to prevent the flow of the neutralized drain water from flowing down, Even if the neutralization treatment by the exhaust gas is insufficient, it is possible to prevent the insufficient exhaust gas drain from flowing down. Alternatively, by providing the weir wall at an intermediate position of the wall area where the neutralizing agent is attached and held, it is possible to prevent the exhaust gas drain from flowing down while performing the neutralization treatment with the neutralizing agent, while the overflow occurred. Even in this case, the neutralization treatment can be performed with the neutralizing agent attached and held in the region on the upstream side of the weir wall. Further, by providing the weir wall on the downstream side of the wall surface area where the neutralizing agent is attached and held (that is, on the exhaust gas drain generation side), it is possible to first prevent the exhaust gas drain from flowing down. Neutralization treatment can be performed with the neutralizing agent attached and held in the region upstream of the wall. As described above, it is possible to more reliably avoid the possibility of corrosion of functional components and the like in the heat source device due to the flow of the strongly acidic exhaust gas drain to the upstream side of the discharge passage.
[0017]
【The invention's effect】
As described above, according to the latent heat recovery type heat source unit of the first aspect, a small amount of exhaust gas drain remains in the exhaust passage by the combustion inspection before the product is shipped, and the time from when the product is shipped to when it is actually installed. In the meantime, even if an unexpected situation occurs in which the posture of the heat source unit body is changed from the original erect state to the sideways state, the residual exhaust gas drain that is about to flow down by the above posture change is attached to the wall area and held. Can be neutralized by a neutralizing agent. For this reason, even if the neutralized drain water after neutralization further flows down, it is possible to prevent the occurrence of corrosion inconvenience.
[0018]
According to the latent heat recovery type heat source device of the second aspect, a small amount of exhaust gas drain remains in the exhaust passage by the combustion inspection before the product is shipped, and the heat source device main body is originally between the product shipment and the actual installation. Even if an unexpected situation occurs in which the posture is changed from the upright state to the sideways state, it is possible to prevent the residual exhaust gas drain that is going to flow down by the above-mentioned posture change by the dam wall and prevent further flow down. it can. For this reason, it is possible to eliminate the possibility of the occurrence of corrosion of functional components and the like in the heat source device due to the flow of the strongly acidic exhaust gas drain upstream of the discharge passage.
[0019]
According to the latent heat recovery type heat source device of the third aspect, since the weir wall is also provided at the same time as the neutralizing agent is attached to and held in the predetermined wall surface area, the effects of both the first and second aspects are reduced. Obtainable. That is, even if the above-mentioned unexpected situation occurs, both neutralization of the exhaust gas drain by the neutralizing agent and prevention of the exhaust gas drain from flowing down can be achieved, and the strongly acidic exhaust gas drain flows down the upstream side of the discharge passage. Therefore, it is possible to more reliably avoid and eliminate the possibility of occurrence of corrosion of functional components and the like in the heat source device due to the above.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
<First embodiment>
FIG. 1 shows a part of a can body 5 of a latent heat recovery type heat source device according to a first embodiment of the present invention. FIG. 6 shows an overall configuration of the latent heat recovery type heat source device. FIG. 1 shows a specific structure of a can body 5 built in a housing (heat source device main body) 1 of FIG. That is, in FIG. 1, a part of the combustion can body portion 52 containing the combustion burner 2 (see FIG. 6), a heat exchange can body portion 53 containing the primary heat exchanger 3, and an exhaust passage 51 are provided inside. The illustrated exhaust passage can body portion 54 and the exhaust tube 9 that incorporates the secondary heat exchanger 4 and has an exhaust outlet 97 to be described later opened on the front side (the left side in the figure) are shown.
[0022]
The exhaust passage can body portion 54 has an exhaust passage 51 inside the entire lower surface of which extends over the entire upper surface of the primary heat exchanger 3 and gradually narrows upward to pass through the rear surface side of the exhaust pipe 9. At an upper end portion, it is assembled so as to communicate with an upper opening 96 described later of the exhaust pipe 9.
[0023]
The exhaust pipe 9 includes a bottom wall 91, a front wall 92, a rear wall 93, a top wall 94, left and right side walls 95, 95 (see also FIG. 2), and exhaust gas from the exhaust passage 51. Through the upper opening 96 at the upper end of the rear wall 93, and to the outside through the exhaust outlet 97 of the front wall 92. The exhaust passage 51 and the internal space 99 from the upper opening 96 to the exhaust outlet 97 form an exhaust passage.
[0024]
The bottom wall 91 is inclined obliquely downward from the rear toward the front, and the upstream end of the drain collecting pipe 81 is open at the front end. That is, the exhaust gas drain falling from the secondary heat exchanger 4 or the like onto the upper surface of the bottom wall 91 is guided to the front end side and dropped into the drain collecting pipe 81. A partition wall 94a is hung down from the top wall 94 on the front end side of the internal space 99, and the flow of the exhaust gas flowing from the upper opening 96 flows through the secondary heat exchanger 4 from above to below by the partition wall 94a. After passing through, it is discharged from the exhaust outlet 97.
[0025]
The upper edge of the rear wall 93 forms a lower opening edge of the upper opening 96, and projects substantially horizontally from the upper edge of the rear wall 93 toward the internal space of the exhaust pipe 9 so that a weir wall 98 is formed, for example, by bending. And so on. In addition, the weir wall 98 is formed so as to extend continuously to the side walls 95 on the left and right sides in succession. Play a role.
[0026]
The secondary heat exchanger 4 is of a fin-and-tube type, and heat is exchanged with the exhaust gas while water from one end of the tube repeatedly passes through many fins. The later preheated water is supplied to the primary heat exchanger 3 from the other end of the tube. That is, the latent heat of the exhaust gas is recovered by heat exchange with water.
[0027]
In the case of the above configuration, the latent heat recovery type heat source device is overturned to the rear (to the right in FIG. 1) or to the side (toward the back or the front in FIG. 1), and is laid on the rear side (right side in FIG. 7). When the posture is changed to the side-down state or the side-down state in any direction, the weir wall 98 projects in the state in which the weir wall 98 projects upward with the posture change in any direction. Will be converted. In the state after this posture change, for example, in the case of the rearwardly lying state, the rear wall 93 is in a substantially horizontal state and becomes a wall surface area where the exhaust gas drain flows down, and flows down from the rear wall 93 to the exhaust passage 51 side. The weir wall 98 projects upward as described above at the opening edge position of the upper opening 96 to be protruded. For this reason, even if the exhaust gas drain that adheres to the surface of the secondary heat exchanger 4 and is not discharged from the drain water collecting pipe 81 due to the combustion inspection before shipping the product and tries to flow down to the exhaust passage 51 side, The exhaust gas drain is blocked by the weir wall 98. Thereby, it is possible to reliably prevent the residual exhaust gas drain from flowing into the primary heat exchanger 3 and the combustion burner 2.
[0028]
In the first embodiment, a weir wall 98a may be provided on each of the inner peripheral surfaces (at least three surfaces) in the exhaust passage 51 instead of the weir wall 98. May be arranged in two steps in addition to the weir wall 98 to ensure more certainty.
[0029]
<Second embodiment>
FIG. 3 is a view corresponding to FIG. 1 showing a second embodiment of the present invention. In FIG. 3, reference numeral 10 denotes a neutralizer container filled with a neutralizer. The other components are the same as in the first embodiment, and the same components are denoted by the same reference numerals as in the first embodiment, and detailed description thereof will be omitted.
[0030]
As shown in FIG. 4, the neutralizing agent container 10 has a container wall 101 formed of a mesh-like material at a predetermined interval, and a neutralizing agent having a relatively small particle size that does not fall off from the container wall 10 inside. (For example, calcium carbonate) 102 is filled. The neutralizer container 10 is set to have a size that covers substantially the entire rear wall 93 (wall surface area) except for the upper opening 96, and is fixed to the inner surface of the rear wall 93 by means such as point welding. The neutralizing agent container 10 holds the neutralizing agent 102 attached to the wall surface region so as to be in contact with the residual exhaust gas drain.
[0031]
In the case of the second embodiment, when the posture is changed to the above-described rearwardly lying state, the exhaust gas drain that is going to flow down to the exhaust passage 51 side through the upper opening 96 is necessarily the neutralizing agent in the neutralizing agent container 10. 102 will be in contact. For this reason, even if it flows down from the upper opening 96 to the exhaust passage 51 side, since the drain water is neutralized by the contact and neutralized from strong acid to neutral, the primary heat exchanger 3 There is no adverse effect such as corrosion on each part on the side of the like.
[0032]
The above-mentioned neutralizer container 10 may be further installed on each inner surface of both side walls 95, 95, preferably on each inner surface extending from the opening edge position of the upper opening 96. Even in the case where the posture is changed to the state, the same effect as in the case where the posture is changed to the above-described rearwardly lying state can be obtained.
[0033]
<Third embodiment>
FIG. 5 is a view corresponding to FIG. 1 showing a third embodiment of the present invention. In FIG. 5, reference numeral 11 denotes a neutralizing film containing a neutralizing agent as a main component. The other components are the same as in the first embodiment, and the same components are denoted by the same reference numerals as in the first embodiment, and detailed description thereof will be omitted.
[0034]
The neutralizing film 11 is formed of a coating film obtained by dissolving a powder of a neutralizing agent (for example, calcium carbonate) in water, mixing and stirring, applying the solution by brush coating, and then drying. The range of formation of the neutralizing film 11 includes at least the inner surfaces of the bottom wall 91 and the rear wall 93 and the inner surfaces of the top and rear portions of the exhaust passage can body 54 constituting the exhaust passage 51 (FIG. 5 is set with many black points). The neutralizing film 11 adheres and holds the neutralizing agent itself to the wall area of the above-mentioned formation area so as to be able to contact the residual exhaust gas drain.
[0035]
In the case of the third embodiment, when the posture is changed to the rear side-down state, the residual exhaust gas drain contacts the neutralizing film 11 while flowing down the bottom wall 91 and the rear wall 93 to perform the neutralization treatment. In addition, the flow is blocked by the weir wall 98 and is prevented from flowing down from the upper opening 96 to the exhaust passage 51 side. Therefore, both the detoxification of the residual exhaust gas drain by the neutralization treatment and the prevention of the exhaust gas drain to the primary heat exchanger 3 and the like can be achieved. Also, in the event that the posture is changed to the laterally lying state, even if there is a residual exhaust gas drain that does not contact the neutralizing film 11, the exhaust gas drain is blocked by the weir wall 98.
[0036]
Preferably, if the inner surfaces of both side walls 95, 95 and the inner surfaces of the respective sides of the exhaust passage can body portion 54 are added as the formation range of the neutralizing film 11, the posture is changed to the sideways sideways state. Also in this case, the neutralization treatment of the residual exhaust gas drain can be performed more reliably.
[0037]
<Other embodiments>
Note that the present invention is not limited to the above-described first to third embodiments, but includes other various embodiments. That is, in the above-described first to third embodiments, the exhaust cylinder 9 has a shape as shown in the figure, but the present invention is applicable to the exhaust gas discharge passage regardless of the shape of the exhaust cylinder 9. Can be.
[0038]
Further, the weir wall 98 of the first embodiment may be added to the second embodiment, or the weir wall 98 may be omitted from the third embodiment.
[0039]
Further, in the first to third embodiments, the case where the fin-and-tube type is adopted as the secondary heat exchanger 4 for latent heat recovery is shown. However, the present invention is not limited to this, and the laminated heat exchanger or A bellows tube (flexible tube) may be adopted. Especially for latent heat recovery type heat source equipment that adopts a heat exchanger for latent heat recovery, such as a stacked heat exchanger, where the fin pitch (plate interval) is relatively small and exhaust gas drain tends to remain during combustion inspection. By applying the invention, a greater effect can be obtained.
[Brief description of the drawings]
FIG. 1 is a partial sectional view showing a main part of a first embodiment of the present invention.
FIG. 2 is a perspective view of a portion of FIG.
FIG. 3 is a diagram corresponding to FIG. 1 of a second embodiment.
FIG. 4 is a perspective view showing the inside of FIG. 3 with a cutout;
FIG. 5 is a diagram corresponding to FIG. 1 of a third embodiment.
FIG. 6 is a principle view showing an example of a latent heat recovery type heat source device.
FIG. 7 is an explanatory diagram for explaining a conventional problem.
[Explanation of symbols]
1 housing (heat source unit body)
2 Combustion burner 3 Primary heat exchanger 4 Secondary heat exchanger (latent heat recovery heat exchanger)
5 Can body 10 Neutralizer container 11 Neutralizing film 51 Exhaust passage (discharge passage)
98 Weir wall 99 Internal space (discharge passage)
102 Neutralizer

Claims (3)

A latent heat recovery type heat source device provided with a latent heat recovery heat exchanger disposed in a flue gas exhaust passage and exchanging heat with the flue gas to recover latent heat of the flue gas,
When the attitude of the heat source unit body is changed from the erect state to the sideways state, at least the exhaust gas drain flows down by gravity toward the upstream side of the combustion exhaust gas in accordance with at least the attitude change of the wall constituting the discharge passage. A latent heat recovery type heat source characterized in that a neutralizing agent for neutralizing the exhaust gas drain is held so as to be in contact with the flowing exhaust gas drain so as to be able to contact the wall region to be changed in posture. Machine. A latent heat recovery type heat source device provided with a latent heat recovery heat exchanger disposed in a flue gas exhaust passage and exchanging heat with the flue gas to recover latent heat of the flue gas,
When the posture of the heat source device body is changed from the upright state to the sideways state, at least the wall of the discharge passage, the exhaust gas drain flows down toward the upstream side of the combustion exhaust gas by gravity action at least in accordance with the attitude change. A latent heat recovery type heat source device characterized by being provided with a weir wall projecting so as to block the exhaust gas drain flowing down in the sideways state with respect to the wall surface region to be changed in posture as described above. A latent heat recovery type heat source device provided with a latent heat recovery heat exchanger disposed in a flue gas exhaust passage and exchanging heat with the flue gas to recover latent heat of the flue gas,
When the attitude of the heat source unit body is changed from the erect state to the sideways state, at least the exhaust gas drain flows down by gravity toward the upstream side of the combustion exhaust gas in accordance with at least the attitude change of the wall constituting the discharge passage. For the wall surface region to be changed in posture, a neutralizing agent for neutralizing the exhaust gas drain is attached so as to be contactable with the flowing exhaust gas drain and held, while the exhaust gas drain flowing down in the sideways state is held. A latent heat recovery type heat source device comprising a weir wall projecting so as to block.

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