JP2003074974A - Combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion apparatus capable of preventing a drain discharge means from being clogged by discharging a retained drain water and a precipitated aluminum compound. SOLUTION: The combustion apparatus comprises a combustion burner 12, a heat exchanger 36 for recovering a sensible heat and a latent heat of the combustion exhaust gas, a drain discharge means 48 for collecting and discharging the drain water generated at the exchanger 36, and a portable water supply means 54 for supplying a portable water to the means 48. Thus, the apparatus neutralizes the drain water flowing through the means 48 by using the potable water from the means 54. The exchanger 36 is formed of a material which contains an aluminum or an aluminum as a main component. The apparatus further comprises a cleaning water supply means 60 for supplying the cleaning water for cleaning the means 48.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a combustion apparatus having a heat exchanger capable of recovering latent heat.

[0002]

2. Description of the Related Art A hot water supply combustor as an example of a combustor is equipped with a heat exchanger for exchanging heat with combustion exhaust gas generated by a combustion burner, and tap water is provided on the inflow side of the heat exchanger. The feed passage is connected, and the hot water outlet passage is connected to the discharge side. In this heat exchanger, tap water is fed to the heat exchanger through the tap water feed passage, and hot water that has been warmed by heat exchange with the combustion exhaust gas in the heat exchanger flows downstream through the tap water passage. Sent to the side.

In this type of combustion device, in order to improve the thermal efficiency, a device provided with a heat exchanger for recovering sensible heat and latent heat of combustion exhaust gas has been put into practical use. A heat exchanger capable of recovering latent heat generally comprises a main heat exchanger section and an auxiliary heat exchanger section, and in the main heat exchanger section, sensible heat in the combustion exhaust gas is recovered and the sub heat exchanger is also used. In the section, sensible heat and latent heat (latent heat held by water vapor in the combustion exhaust gas) in the combustion exhaust gas are recovered. When this heat exchanger capable of recovering latent heat is used, the latent heat of steam in the combustion exhaust gas is removed during heat exchange in the sub heat exchanger section, and the steam is condensed in the sub heat exchanger section. Since dew condensation occurs, the generated dew condensation water (condensed water) is collected by drain drainage means and drained to the outside as drain water. Drain water
Since it absorbs nitrogen oxides and sulfur oxides in the combustion exhaust gas and becomes acidic water of about pH 4, tap water is added as a neutralizing agent to dilute and neutralize this drain water. The pH of drain water is adjusted by the buffering action of tap water and the alkaline component in tap water.

In such a latent heat recovery type combustion apparatus, the heat exchanger may be formed of aluminum or a material containing aluminum as a main component. In a combustion device equipped with a heat exchanger formed of such materials, the aluminum component begins to dissolve in dew condensation water (drain water) adhering to the heat exchanger during heat exchange, and the drain water discharged is , It is also neutralized to some extent by the molten aluminum component.

[0005]

However, when the heat exchanger is made of the above-mentioned materials, the following problems occur. That is, when the drain water containing the melted aluminum component is mixed with tap water, the aluminum component undergoes a chemical reaction to become an aluminum compound (for example, aluminum hydroxide) by neutralization with tap water. It will start to precipitate. Such precipitates are discharged together with the mixed water (mixed water of drain water and tap water) through the drain drainage channel, but part of them is attached to the inner wall surface of the drainage pipe that constitutes the drain drainage channel. It will remain. For this reason, when the combustion device is used for a long period of time, the residual amount of the deposited aluminum compound increases, which deteriorates the flow of the drain drainage flow path and causes clogging of the drain drainage flow path.

An object of the present invention is to provide a combustion device capable of discharging residual drain water and precipitated aluminum compound to prevent clogging of the drain discharging means.

[0007]

DISCLOSURE OF THE INVENTION The present invention is directed to a combustion burner for producing combustion exhaust gas, a heat exchanger for recovering sensible heat and latent heat of the combustion exhaust gas, and heat exchange between the combustion exhaust gas. The drainage means for collecting and discharging the drainage water generated in the heat exchanger by means of the drainage means, and the tapwater supply means for supplying the tapwater to the drainage means. By supplying tap water to the drain drain passage of the drain drain means, a combustion device for neutralizing drain water flowing through the drain drain passage, wherein the heat exchanger is mainly composed of aluminum or aluminum. And a control means for controlling the cleaning water supply means, the cleaning water supply means for supplying the cleaning water for cleaning the drain drainage means, the control means being formed of a material for cleaning the drainage drainage means. Characterized in that the stage is provided.

According to the present invention, the combustion apparatus has a cleaning unit for supplying the cleaning water for cleaning the drain drainage unit in addition to the tap water supplying unit for supplying the tap water for neutralizing the drain water. The water supply means and the control means for controlling this are provided. When the control means actuates the wash water supply means, the wash water from the wash water supply means is supplied to the drain drain means, thus washing the drain drain means with this wash water and depositing the drain water and depositing at the time of neutralization. The aluminum compound or the like is discharged to the outside together with the washing water, whereby clogging or the like due to the aluminum compound can be prevented. Tap water or the like can be used as the cleaning water, and the control unit can set the operation timing of the cleaning water supply unit as required to reliably and efficiently discharge the precipitated aluminum compound or the like. it can.

Further, in the present invention, the wash water supply means supplies a larger amount of wash water than the supply quantity of tap water supplied from the tap water supply means to the drain drain means at the time of neutralization of drain water. It is characterized by supplying to drain drainage means.

According to the present invention, the cleaning water supply means supplies the drain drain means with a larger amount of cleaning liquid than the supply amount (supply amount per unit time) of the tap water from the tap water supply means. Drain water adhering to the drainage means and aluminum compounds and the like remaining at the time of neutralization can be reliably discharged by the wash water.

Further, according to the present invention, the cleaning water supply means is
Cleaning water heated to a predetermined temperature is supplied to the drain drain means. According to the present invention, the cleaning water supply means supplies the cleaning water heated to a predetermined temperature, for example, about 40 ° C. By supplying the heated cleaning water in this manner, the aluminum compound or the like is easily dissolved in the cleaning liquid, and the aluminum compound or the like can be reliably discharged together with the drain water attached to the drain drain means.

Further, according to the present invention, the control means operates the cleaning water supply means at every predetermined timing set in advance. According to the present invention, since the cleaning water supply means operates at every preset timing, the cleaning water from the cleaning water supply means is supplied to the drain drainage means at this timing, and thereby the drain water adheres to the drain drainage means. It is possible to discharge drain water, aluminum compound, and the like. The cleaning water supply means may be activated at an appropriate number of times, for example, once a day or twice or more. For example, once a day, at 10 am
Further, for example, in the case of twice a day, it can be set to operate at 10 am and 12 pm, for example.

Further, in the present invention, the control means operates the cleaning water supply means in association with the end of combustion of the combustion burner. According to the present invention, since the cleaning water supply means operates in association with the end of combustion of the combustion burner, the cleaning water is supplied to the drain drain means as required after the end of combustion, and the drain water generated during combustion and the combustion The aluminum compound and the like generated by the neutralization can be efficiently discharged.

Further, in the present invention, the control means operates the cleaning water supply means each time combustion of the combustion burner is completed. According to the present invention, since the cleaning water supply means supplies the cleaning water to the drain drain means each time combustion of the combustion burner is completed, the drain water and the aluminum compound can be discharged when they are generated.

Further, in the invention it is characterized in that the control means operates the cleaning water supply means at every predetermined timing after the combustion of the combustion burner is completed.

According to the present invention, since the cleaning water supply means supplies the cleaning water at a predetermined timing after the end of the combustion burner, the cleaning water is supplied when the drain water generated during the combustion is almost drained. As a result, the generated drain water, aluminum compound, etc. can be reliably and efficiently drained when they occur.

Further, in the present invention, the cleaning water supply means further includes a feed pump for pumping the cleaning water, and when the cleaning water is supplied from the cleaning water supply means, the control means is It is characterized in that the feed pump is operated.

According to the present invention, the feed pump is operated when the wash water is supplied from the wash water supply means, and the wash water is sent under pressure by the feed pump. Therefore, the drain water is drained by the pressure of the wash water sent under pressure. It is possible to more reliably discharge the drain water, the aluminum compound and the like attached to the means.

Further, in the present invention, the drain drain means has a drain drain passage for draining drain water, and the drain drain passage has a water sealing structure for preventing leakage of combustion exhaust gas. The cleaning water supply means is provided, and supplies the cleaning water to the storage part of the water sealing structure.

According to the present invention, the cleaning water supply means supplies the cleaning water to the storage part of the water sealing structure provided in the drain drain means. Since the aluminum compound and the like will be accumulated in the storage part of the water-sealed structure, by supplying the cleaning water to this storage part, the accumulated aluminum compound and the like can be discharged together with the cleaning water. In addition, it is preferable that the cleaning water be jetted toward the bottom of the water-sealed storage portion, and the aluminum compound and the like accumulated at the bottom of the water should be mixed with the washing water and discharged. You can

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a combustion apparatus according to the present invention will be described below with reference to the accompanying drawings. First Embodiment First, a first embodiment of a combustion apparatus according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a simplified diagram schematically showing the combustion apparatus of the first embodiment.
2 is a flowchart showing a part of control of the combustion device of FIG. 1.

In FIG. 1, the illustrated hot water supply combustion device 2 includes a device housing 4, and a combustion chamber 6 is defined in the combustion housing 4. Above the combustion chamber 6 is shown in FIG.
An exhaust passage 8 extending laterally is formed, and an exhaust port 10 is provided at the downstream end of the exhaust passage 8. Combustion chamber 6
A combustion burner 12 is provided in the lower part of the combustion burner 12 in the illustrated embodiment.
It is composed of 6,18. A blower fan 20 is provided at the lower end of the combustion chamber 6, and the blower fan 20 sends combustion air to the combustion chamber 6.

Fuel gas (for example, city gas, LP gas) is supplied to the combustion burner 12 through a gas supply passage 22. The downstream side of the gas supply flow path 22 includes a main supply flow path part 24 and first and second branched gas supply flow path parts 26, 28.
And the main gas supply flow path section 24 is connected to the first burner section 14
And the first branch supply flow path section 26 is connected to the second burner section 1
6, and the second branch supply flow passage portion 28 is connected to the third burner portion 18. A source gas on-off valve 30 and a proportional valve 31 are sequentially provided in the gas supply flow path 22 from the upstream side, a first gas switching valve 32 is provided in the first branch supply flow path unit 26, and a second branch supply flow path is provided. The portion 28 is provided with a second gas switching valve 34. The original gas opening / closing valve 30 is the gas supply flow path 22.
Is opened and closed to supply and stop the supply of the fuel gas, the proportional valve 31 controls the supply amount of the fuel gas flowing through the gas supply passage 22, and the first gas switching valve 32 is formed into the first branch supply passage. The portion 26 is opened and closed to supply and stop the supply of the fuel gas to the second burner portion 16, and the second gas switching valve 34 opens and closes the second branch supply flow passage portion 28 to the third burner portion 18. Supply and stop supply of fuel gas.

A heat exchanger 36 for recovering sensible heat and latent heat in the combustion exhaust gas is arranged in the exhaust passage 8 on the downstream side of the combustion chamber 6. The heat exchanger 36 is composed of a main heat exchanger portion 38 and a sub heat exchanger portion 40, which are made of aluminum or a material containing aluminum as a main component. In such a heat exchanger 36, the main heat exchanger portion 38 is provided on the upstream side and the auxiliary heat exchanger portion 40 is provided on the downstream side as viewed in the flow direction of the combustion exhaust gas.

The combustion device 2 is, for example, a kitchen sink,
Used as a device for supplying hot water to a curran (not shown) provided on a washbasin, etc., and supplies tap water from a tap water supply source (not shown) such as a tap water buried pipe. The flow passage 42 is connected to the sub heat exchanger portion 40 of the heat exchanger 36, the hot water outlet passage 44 connected to the curran is connected to the main heat exchanger portion 38 thereof, and the tap water supply passage 42 is connected to the tap water. A water opening / closing valve 46 is provided.

With this structure, when the calan (not shown) is opened, the tap water opening / closing valve 46 of the tap water supply passage 42 is opened and the original gas opening / closing valve 3 is opened.
0 is in an open state (the first and / or second gas switching valves 32, 34 are in an open state, depending on the combustion state), and the tap water from the tap water supply passage 42 first undergoes heat exchange. The sensible heat and latent heat in the combustion exhaust gas are recovered by being fed to the sub heat exchanger section 40 of the reactor 32 and exchanging heat with the combustion exhaust gas in the sub heat exchanger section 40. The hot water that has undergone heat exchange in this sub heat exchanger section 40 is then fed to the main heat exchanger section 38, and heat exchanged with the combustion exhaust gas in this main heat exchanger section 38, Sensible heat in the combustion exhaust gas is recovered. The hot water thus heated by the heat exchanger 36 is fed to the calan (not shown) through the hot water flow passage 44, and the hot water is discharged from the opened calan.

In the above-described combustion apparatus 2, since the sub heat exchanger portion 40 of the heat exchanger 36 also recovers the latent heat in the combustion exhaust gas, dew condensation occurs in the sub heat exchanger portion 40. In connection with this, the drain draining means 48 is provided so that the water condensed in the sub heat exchanger section 40 is drained to the outside as drain water. The drain draining means 48 shown in the figure extends from the drain receiving portion 50 provided at a predetermined portion of the device housing 4 (specifically, a portion located below the auxiliary heat exchanger portion 40). The drain discharge flow path 52 is included, and the drain discharge flow path 52 is provided with a mixing tank. The water condensed in the sub heat exchanger section 40 is dripped and collected in the drain receiving section 50. Is drained to the outside through the drain drainage channel 52 and the mixing tank 53.

The drain drainage means 48 is further connected with tap water supply means 54 for supplying tap water used for diluting and neutralizing the drain water. The tap water supply means 54 is provided with a neutralization water supply flow path 56 for supplying tap water as a neutralizing agent, and one end side of the tap water supply flow path 42 (specifically, an upstream side of the tap water opening / closing valve 46). Part) and the other end side is connected to the mixing tank 53 of the drain drainage means 48, and the neutralization water supply passage 56 is provided with a neutralization opening / closing valve 58.
Is provided. Therefore, when the neutralization opening / closing valve 58 is opened, a part of the tap water from the tap water supply passage 42 is supplied to the mixing tank 53 through the neutralization water supply passage 56.

Further, to the drain drainage means 48, a wash water supply means 60 for washing the drain drainage means 48 with wash water is connected. Wash water supply means 60
Includes a cleaning water supply channel 62 for supplying tap water as cleaning water, one end side of which is connected to the tap water supply channel 42 (specifically, a site upstream of the tap water opening / closing valve 46). The end side is connected to the mixing tank 53 of the drain drainage means 48, and a cleaning opening / closing valve 64 is disposed in the cleaning water supply passage 62. Therefore, when the cleaning opening / closing valve 64 is opened, a part of the tap water from the tap water supply passage 42 is supplied to the mixing tank 53 through the cleaning water supply passage 62.

In this embodiment, the tap water supply means 5
Although the neutralization water supply passage 56 of No. 4 and the cleaning water supply passage 62 of the cleaning water supply means 60 are provided in parallel, the downstream side of one water supply passage is branched into two (or the same). After branching the intermediate part into two, these are joined together, one branch flow path part is made to function as tap water supply means (one branch flow path part is provided with an on-off valve for neutralization), and the other branch flow The passage may function as the washing water supply means (the other branch passage is provided with a washing opening / closing valve).

In this embodiment, tap water supply means 54
The (neutralizing on-off valve 58) and the wash water supply means 60 (washing on-off valve 64) are controlled by the control means 66. The control means 66 is composed of, for example, a control microcomputer, and in this embodiment, the operation control means 68, the timer 70, and the clock means 7
2 and a memory 74. The operation control means 72 is
The neutralization opening / closing valve 58 and the cleaning opening / closing valve 64 are operated and controlled as described later. The time measuring means 72 measures the time, and the timer 7
0 counts the set time. Further, the memory 74 stores a predetermined operation timing for activating the cleaning water supply means 60, and a time for holding the predetermined operation timing. This operation timing is set in advance, and for example, when the operation is performed once a day, it is set at 10:00 am, for example. The operation timing may be set to be twice or more a day in order to increase the number of operations, or conversely, once a two days or the like in order to reduce the number of operations. Good. The time for operating the wash water supply means 60 is set to, for example, about 1 to 3 minutes.

Next, with reference to FIG. 1 and FIG. 2, the cleaning process of the drain drain means of the above-mentioned combustion device 2 will be described. In this combustion device 2, the original gas on-off valve 3
When 0 is opened and the combustion burner 12 burns, the operation control means 6 is operated based on the open signal from the source gas on-off valve 30.
8 activates the tap water supply means 54 (in other words,
The opening / closing valve 58 for neutralization is opened), the tap water supply passage 4
A part of the tap water from 2 is supplied to the mixing tank 53 through the neutralization water supply passage 56. Further, when the original gas on-off valve 30 is opened, the combustion burner 12 burns, and the tap water sent to the heat exchanger 36 through the tap water supply passage 42 exchanges heat with the combustion exhaust gas. The heated hot water is sent to the downstream side through the hot water outlet passage 44. At this time, the water vapor contained in the combustion exhaust gas is condensed in the sub heat exchanger section 40 of the heat exchanger 36, and the condensed dew water is condensed into the drain receiving section 50.
Collected by the drain drainage channel 52 and the mixing tank 53
Drained to the outside. Therefore, the tap water from the neutralization water supply passage 56 is mixed with the drain water flowing through the drain drain passage 52 in the mixing tank 53, and the drain water is diluted by the buffer action of the tap water and the alkaline component contained therein. , Neutralized.

A small amount of an aluminum component is dissolved in the drain water drained in this way. Therefore, when mixed with tap water and neutralized, an aluminum compound is deposited,
After the operation of the combustion device 2 is completed, the drain water and the aluminum compound are left on the inner wall of the drainage pipe that defines the drainage drainage channel 52.

In the first embodiment, the drain drainage channel 52 is washed at preset predetermined times. That is,
At a preset time, such as 10 am,
From step S-1 to step S-2, the operation control means 68 activates the wash water supply means 60 (in other words, opens the wash opening / closing valve 64), and from the tap water supply passage 42. Part of the tap water is supplied to the mixing tank 53 through the cleaning water supply passage 62, and is drained from the mixing tank 53 to the outside through the drain drain passage 52. Therefore, the drain water, the aluminum compound, and the like remaining in the drain drain passage 52 are discharged together with the thus-washed tap water for cleaning.

When the cleaning water supply means 60 operates, the timer 70 operates (step S-3), and the above-described supply of cleaning tap water is performed until the timer 70 measures a predetermined time (for example, 1 minute) and the time is up. Is done. Then, when the timer 70 times out, the process proceeds from step S-4 to step S-5, and the operation of the cleaning water supply means 62 ends (the opening / closing valve 64 for cleaning is closed).

In the first embodiment, the wash water supply means 60 is activated at a predetermined time every day, so that the drain drain means 48 can be washed with tap water once a day. Thus, it is possible to prevent the aluminum compound or the like from accumulating in the tap water drainage channel 52.

The amount of tap water supplied through the washing water supply passage 62 (supply amount per unit time) is made larger than the amount of tap water supplied through the neutralization water supply passage 56. With such a configuration, the drain water, the aluminum compound, and the like remaining in the drain drainage channel 52 can be caused to flow together with the cleaning water, and the drain drainage channel 52 can be reliably cleaned.

Second Embodiment In the combustion apparatus of the first embodiment, the wash water supply means 60 is operated at a predetermined time regardless of whether the combustion apparatus 2 is operated or stopped. In the embodiment, the cleaning process is performed by the cleaning water supply unit while the combustion device is operating, in other words, when the drain water is neutralized by the tap water supplied from the tap water supply unit. In the second embodiment, the same members as those in the first embodiment will be described using the same numbers.

In the combustion apparatus of the second embodiment, although not shown, the control means 66 further includes a counter for counting the number of times the combustion apparatus has been operated, that is, the number of times the combustion burner 12 has burned, and the memory 74. In addition, a preset number of combustion times that serves as a reference for operating the cleaning water supply means 60 is also stored in advance. The set number of combustions is set to about 5 times, for example. The other structure of the second embodiment is substantially the same as that of the first embodiment.

In the second embodiment, the cleaning process of the drain drain means is performed according to the flowchart of FIG. 3 (since the basic structure of the combustion device is almost the same as that of the first embodiment, the combustion device is See FIG. 1 for the configuration of the above).

For hot water supply, for example, curran (not shown)
When the tap water is opened, the tap water opening / closing valve 46 is opened, and the tap water from the tap water supply passage 42 flows through the heat exchanger 36. Further, by doing so, the source gas opening / closing valve 30 is opened, the combustion burner 12 burns, heat is exchanged between the tap water and the combustion exhaust gas in the heat exchanger 36, and the heated hot water is the hot water outlet passage 44. Flow out and tap water is discharged from the opened karan.

When the combustion apparatus operates in this way and the source gas on-off valve 30 is opened, the routine proceeds from step S-11 to step S-12, where the count value of the counter (not shown) of the control means 66 is ". 1 ”is added, and the count value of the counter indicates the number of combustions of the combustion device, that is, the number of times the original gas on-off valve 30 is opened. Next, step S-1
3, the opening / closing valve 58 for neutralization of the tap water supply means 54 is opened, and a part of the tap water from the tap water supply passage 42 is mixed with the drain drain means 48 through the neutralization water supply passage 56. It is supplied to the tank 53. By doing so, tap water is mixed with the drain water in the mixing tank 53, and the drain water is diluted and neutralized by this tap water.

When the neutralization process with tap water is performed in this manner, it is determined whether or not the counter value of the counter is a predetermined set value, for example, 5 or more. If the counter value is less than 5, the process proceeds to step S-20, the operation of the combustion apparatus is stopped, in other words, the above-described state is continuously performed until the original gas on-off valve 30 is closed, and heat exchange is performed. The hot water heated by the above is supplied and the generated drain water is neutralized. Then, when the operation of the combustion device is stopped (the source gas on-off valve 30 is closed), the neutralizing on-off valve 58 is closed, and the supply of tap water by the tap water supply means 54 is completed.

On the other hand, if the counter value of the counter (not shown) is 5 or more, in other words, if the combustion device operates 5 times or more, the process proceeds from step S-14 to step S-15, and the cleaning on-off valve 64 is opened. In the opened state, tap water is passed through the washing water supply passage 62 of the washing water supply means 60 to mix tap water.
3, the drain water is diluted and neutralized by the tap water (flowing in a relatively large amount) from both the tap water supply means 54 and the wash water supply means 60, and the drain drain passage 52 is washed. . In this way, drain drainage channel 5
2 is performed, the counter value of the counter (not shown) is reset (step S-16), and the timer 70
Operates (step S-17). This cleaning process is performed until the timer 70 times out. When the timer 70 times out, the process proceeds from step S-18 to step S-19, the cleaning on-off valve 64 is closed, and the supply of cleaning tap water is completed. . Then, the process proceeds to step S-20, it is determined whether or not the original gas on-off valve 30 is in the closed state, and in the same manner as described above, hot water heated by heat exchange until it is in the closed state and the generated drain water are generated. Is neutralized. When the source gas on-off valve 30 is closed, the neutralizing on-off valve 58 is closed (step S-21), and the supply of tap water by the tap water supply means 54 ends.

If the source gas on-off valve 30 is closed (the operation of the combustion device is stopped) before the timer 70 times out, steps S-22 to S-23.
Then, the cleaning on-off valve 64 is closed, and the supply of cleaning water from the cleaning water supply means 60 is completed. After that, the neutralizing on-off valve 58 is closed, and the supply of tap water from the tap water supply means 54 is also terminated (step S-21).

In this combustion apparatus, the number of combustions of the combustion apparatus,
In other words, if the number of times the original gas on-off valve 30 is opened becomes a predetermined number (five times in this embodiment) or more, the cleaning water supply means 6
Since 0 is in the operating state and the cleaning water is supplied to the drain drain passage 52, the drain drain passage 52 can be efficiently cleaned without wasting the cleaning water.

In this embodiment, if the original gas on-off valve 30 is closed before the timer 70 times out, the cleaning on-off valve 64 of the cleaning water supply means 60 is closed. Instead of such a configuration, the opening / closing valve 64 for cleaning is also set at this time after the timer 70 times out.
May be closed. The number of combustion times that serves as a reference for supplying the cleaning water can be set as appropriate, and the set number of combustion times can be reduced (or increased) to increase (or decrease) the number of cleaning times.

Third Embodiment In the combustion apparatus of the second embodiment, the cleaning process is performed by the cleaning water supply means during the operation of the combustion apparatus.
In the third embodiment, the cleaning process is performed after the combustion of the combustion device. Also in the third embodiment, the same members as those in the first embodiment will be described using the same reference numerals.

In the combustion apparatus of the third embodiment, although not shown, the control means 66 further includes an integrating counter (not shown) for counting the time for starting the operation of the combustion apparatus, and the memory 74. In addition, a preset count value serving as a reference for operating the cleaning water supply means 60 is further stored in advance. This set count value is set to about 3 hours, for example. The other structure of the third embodiment is the same as the first embodiment.
Is substantially the same as that of the above embodiment.

In the third embodiment, the cleaning process of the drain drain means is performed according to the flow chart of FIG. 4 (since the basic structure of the combustion device is almost the same as that of the first embodiment, Also in the description of the third embodiment, see FIG. 1 for the configuration of the combustion device).

For hot water supply, for example, curran (not shown)
When the tap water is opened, the tap water opening / closing valve 46 is opened, and the tap water from the tap water supply passage 42 flows through the heat exchanger 36. Further, by doing so, the source gas opening / closing valve 30 is opened, the combustion burner 12 burns, heat is exchanged between the tap water and the combustion exhaust gas in the heat exchanger 36, and the heated hot water is the hot water outlet passage 44. Flow out and tap water is discharged from the opened karan.

When the combustion apparatus is operated and the source gas on-off valve 30 is opened as described above, the process proceeds from step S-21 to step S-22, and the neutralizing on-off valve 58 of the tap water supply means 54 is opened. Then, a part of the tap water from the tap water supply passage 42 is supplied to the mixing tank 53 of the drain drainage means 48 through the neutralization water supply passage 56, and the drain water is diluted and neutralized by the tap water. Hot water is supplied and drain water is neutralized until the gas on-off valve 30 is closed.

When the source gas on-off valve 30 is closed (the operation of the combustion apparatus is stopped), the process proceeds from step S-23 to step S-24, and the neutralizing on-off valve 58 is closed. The supply of tap water for neutralization ends. Next, when the integration of the time of the integration counter (not shown) is started and the integration count reaches a predetermined value, for example, 3 hours, step S
-26 to step S-27, the on-off valve for cleaning 64
Is opened, part of the tap water from the tap water supply passage 42 is supplied to the mixing tank 53 through the washing water supply passage 62, and the drain drain passage 52 is washed by the tap water.
This cleaning process is performed until the timer 70 times out, as described above. When the timer 70 times out, the cleaning on-off valve 64 is closed and the supply of cleaning water is terminated, after which the integration counter is reset. (Step S-3
1).

On the other hand, when the original gas on-off valve 30 is opened (reacts again within 3 hours after the operation of the combustion device is stopped) during the integration count of the integration counter (not shown), the process returns to step S-22. , Step S-22 to Step S-24
Is performed as described above. Then, step S-2
When the process proceeds to step 5, an integrating counter (not shown) starts integrating from the accumulated count value so far, and when the integrated value reaches a predetermined value, the process proceeds from step S-26 to step S-27, and the drain drainage flow is performed. The above-described cleaning process of the passage 52 is performed.

In this embodiment, the cleaning on-off valve 64 is opened for cleaning when a predetermined time has passed after the end of the operation of the combustion apparatus, so that the condensed water generated in the heat exchanger 36 is almost completely removed. After the water is drained, the cleaning is performed, so that the residual drain water and the aluminum compound can be reliably cleaned.

In this embodiment, the cleaning process is performed when the integration counter has integrated the predetermined time. However, instead of such a configuration, every time the combustion device is deactivated, a predetermined period is determined after the deactivation. The cleaning on-off valve 64 may be opened to supply the cleaning tap water after a lapse of time. The set time for starting the cleaning process (in this embodiment, the integrated count value) can be set appropriately.

Fourth Embodiment Next, a combustion apparatus of a fourth embodiment will be described with reference to FIGS. FIG. 5 is a diagram schematically showing a part of the combustion apparatus of the fourth embodiment, and FIG. 6 is a flowchart showing a flow of a cleaning process in the combustion apparatus of FIG. In the combustion apparatus of the first embodiment, the cleaning tap water is simply supplied from the cleaning water supply means, but in the fourth embodiment, the cleaning tap water is pumped and A cleaning process is performed each time combustion in the combustion device is completed. Also in the fourth embodiment, the same members as those in the first embodiment will be described using the same reference numerals.

In FIG. 5, in this combustion apparatus 2A, a feed pump 82 is arranged in the washing water supply passage 62 of the washing water supply means 60. The feed pump 82 is disposed on the upstream side of the cleaning on-off valve 64, and feeds tap water from the tap water feed passage 42 toward the mixing tank 53 by pressure. This feeding pump 8
2 is operation-controlled by the control means 66. Other configurations of the fourth embodiment are substantially the same as those of the first embodiment described above, and for components not shown in FIG. 5, refer to FIG.

Explaining also with reference to FIG. 6, for example, when a calan (not shown) is opened, the tap water opening / closing valve 46 is opened and the tap water from the tap water supply passage 42 is heated. It flows through the exchanger 36, the source gas on-off valve 30 is opened, the combustion burner 12 burns, and the hot water heated by the heat exchanger 36 flows through the hot water flow passage 44 to the Karan.

When the source gas on-off valve 30 is opened, the neutralizing on-off valve 58 of the tap water supply means 54 is opened (step S-42), and one of the tap water from the tap water supply passage 42 is opened. Drainage means 4 through the neutralization water supply passage 56
8 to the mixing tank 53. And the original gas on-off valve 3
When 0 is closed, the neutralizing on-off valve 58 is closed (step S-44) and the supply of neutralizing tap water is completed. The operations of steps S-41 to S-44 are substantially the same as steps S-21 to S-24 in the third embodiment.

When the operation of the combustion apparatus 2A is completed in this way, the cleaning on-off valve 64 is opened (step S
-45), the feed pump 82 is activated, and a part of the tap water from the tap water feed passage 42 is fed under pressure by the action of the feed pump 82, and passes through the cleaning water feed passage 62 to mix tank 5
3 is supplied. Therefore, the cleaning tap water that has been pumped is supplied to the cleaning water supply channel 62, the mixing tank 53, and the drain drainage channel 5.
Since the water flows through the drain 2, the drain water, the aluminum compound, and the like remaining in the drain drainage channel 52 can be discharged more reliably by utilizing the water pressure of the cleaning tap water.

This cleaning process is performed, for example, as in the third embodiment until the timer 70 times out. When the timer 70 times out, the operation of the feed pump 82 is stopped (step S-49), and the cleaning process is performed. The on-off valve 64 is closed and the supply of washing water is completed (step S-50).

In this embodiment, a feed pump 82 is provided in the wash water supply passage 62 of the wash water supply means 60. Such a feed pump 82 is the same as in the first to third embodiments. Further, it can be similarly applied to the fifth embodiment described next.

Fifth Embodiment Next, a combustion apparatus of a fifth embodiment will be described with reference to FIGS. 7 and 8. FIG. 7 is a diagram schematically showing a part of the combustion apparatus of the fifth embodiment, and FIG. 8 is a flowchart showing a flow of cleaning processing in the combustion apparatus of FIG. In the combustion apparatus of the first embodiment, normal tap water is supplied from the wash water supply means, but in the fifth embodiment, hot water is supplied from the wash water supply means. still,
Also in the fifth embodiment, the same members as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 7, in the combustion apparatus 2B, the cleaning water supply means 60B supplies hot water as cleaning water to the drain drain means 48. To further explain, the cleaning water supply means 6
OB is provided with a hot water supply passage 92 for cleaning, one end side of which is connected to the hot water outlet passage 44, and the other end side is the drain drainage means 4
8 is connected to the mixing tank 53 and the washing warm water supply passage 9
An on-off valve 94 for cleaning is provided at 2. Therefore, when the cleaning on-off valve 94 is opened, a part of the hot water flowing through the hot water outlet passage 44 is passed through the hot water supply passage 92 for cleaning to cause the mixing tank 5 to flow.
3 is supplied. The other configuration of the fifth embodiment is substantially the same as that of the above-described first embodiment.

Next, with reference to FIG. 8 together with FIG. 7, the cleaning process in the above-mentioned combustion device 2B will be described.
In the combustion device 2B, similarly to the first embodiment, the drain drainage flow path 52 is washed at preset predetermined times. At a preset predetermined time (for example, 10:00 am), the cleaning opening / closing valve 94 is opened (step S-62), and the water (tap water) in the hot water supply flow path 44 is heated by the cleaning hot water supply flow path 92. Through to the drain drainage channel 52, whereby the tap water opening / closing valve 46 is opened,
Tap water flows to the heat exchanger 36 through the tap water supply passage 42.

Next, the source gas on-off valve 30 is opened,
The fuel gas is supplied through the gas supply passage 22 and burned in the combustion burner 12 (for example, the first and second gas switching valves 32 and 34 are maintained in the closed state, and the first burner portion 14 thereof is used). Burned). Thus, heat exchange is performed between the tap water flowing through the heat exchanger 36 and the combustion exhaust gas flowing through the exhaust passage 8, and hot water heated by the heat exchange, for example, hot water at 40 ° C. The water is supplied to the mixing tank 53 of the drain draining means 48 through the hot water supply passage 92 for cleaning, and thus the hot water is used for cleaning. Generally, aluminum compounds and the like are more easily dissolved in warm water. Therefore, by supplying warm water as washing water, residual aluminum compounds and the like can be effectively removed, and the washing effect by the washing water can be improved. It can be increased.

When the cleaning water supply means 60B is activated, the timer 70 is activated (step S-64).
The hot water for cleaning is supplied until the time elapses. When the timer 70 times out, the cleaning on-off valve 94 is closed and the cleaning water supply means 60B.
Is completed (step S-66), the original gas on-off valve 30 is then closed, and the combustion of the combustion burner 12 is completed. As described above, in the fifth embodiment, the drain drainage channel 52 can be washed using warm water as the washing water.

Although various embodiments of the combustion apparatus according to the present invention have been described above, the present invention is not limited to such embodiments, and various modifications and corrections can be made without departing from the scope of the present invention. is there.

For example, in each of the above-mentioned embodiments, the tap water from the wash water supply means 60 (60B) is supplied to the mixing tank 53 of the drain drain means 48, but the wash water supply means 60 (60B). The wash water from the drain drain passage 52 may be supplied to the upstream side of the mixing tank 53, or may be jetted toward the sub heat exchanger portion 40 of the heat exchanger 36. By thus jetting, the drain water, the aluminum compound and the like attached to the sub heat exchanger portion 40 can also be removed. Further, instead of such a configuration, the configuration may be as shown in FIG.

FIG. 9 is an enlarged view of a part of the drainage means.
At the intermediate portion of the drain drainage channel 52, the water sealing structure 10
Two are provided. The water seal structure 102 includes a water seal housing 104, a partition wall 106 is provided at an intermediate portion of the water seal housing 104, a lower space in the water seal housing 104 is partitioned by the partition wall 106, and an upper space thereof communicates with each other. ing. The lower end portion of the upstream pipe 108 that defines the upstream flow passage portion 52a of the drain drainage flow passage 52 extends to the bottom of one chamber 110 (the left chamber in FIG. 9) of the water-sealed housing 104, and the height of the partition wall 106 increases. It is submerged in the drain water 114 that is filled up. In addition, the upper end portion of the downstream side pipe 116 that defines the downstream side flow passage portion 52 b of the drain drainage flow passage 52 is the other chamber 1 of the water seal housing 104.
The drain water that is communicated with the bottom portion of 12 and overflows from the partition wall 106 and flows into the other chamber 112 is
It is drained to the outside through 2b. With such a configuration, the upstream side flow passage portion 52a of the drain drainage flow passage 52 is formed.
A water-sealing structure is achieved between the exhaust passage 8 and the downstream flow passage 52b, and a part of the combustion exhaust gas flowing in the exhaust flow passage 8 flows from the upstream flow passage 52a of the drain drainage flow passage 52 to the downstream flow passage thereof. It can be prevented from flowing into the portion 52b.

When the drain drain means 48 is provided with such a water sealing structure 102, the jet nozzle 118 of the wash water supply means 60B (communicates with the wash water supply passage 62 and the wash warm water supply passage 92). Extends toward the bottom of the one chamber 110, and from the ejection nozzle 118 to the one chamber 11
It is desirable that the cleaning water (tap water, hot water) is ejected toward the bottom of 0 (for example, it is ejected by using the water pressure or the pump pressure of the feed pump). In such a watertight structure 102, the aluminum compound 120 and the like contained in the drain water 114 will be collected at the bottom of the first chamber 110 of the water sealing structure 102, but from the jet nozzle 118 of the cleaning water supply means 60B. By spraying the wash water toward the bottom of the first chamber 110, the aluminum compound 120 and the like accumulated at the bottom is floated by the wash water, overflows from the partition wall 106 together with the jetted wash water, and the downstream flow path is formed. It flows to the portion 52b, and thus the accumulated aluminum compound or the like can be effectively discharged.

Further, for example, in any of the above-described embodiments, the exhaust flow passage extends in the lateral direction, and the main heat exchanger portion of the heat exchanger is arranged on the upstream side of this exhaust flow passage. The description has been given by applying to the combustion device of the form in which the auxiliary heat exchanger part 36 is arranged on the downstream side, but the invention is not limited to such a form of the combustion device, and for example, exhausts upward (or downward) from the combustion chamber. The flow path extends, the main heat exchanger section is arranged on the upstream side of the exhaust flow path, and the auxiliary heat exchanger is provided on the downstream side of the exhaust flow path above (or below) the main heat exchanger section. The same can be applied to the one in which the parts are arranged.

Further, for example, in the above-described embodiments, all of the embodiments have been described as being applied to the hot water supply combustion device for supplying hot water, but other combustion devices, for example, the hot water heating device device, are passed through the hot water circulation passage. The invention can be widely applied to a heating combustion device for circulating hot water, a combustion device combining a hot water supply combustion device and a heating combustion device, and the like.

[0075]

According to the combustion device of claim 1 of the present invention,
Since the washing water supply means for supplying the washing water for washing the drain drain means and the control means for controlling the washing water are provided, the drain water is supplied by operating the washing water supply means. The means can be washed and the attached drain water and the aluminum compound and the like deposited during neutralization can be discharged to the outside together with the washing water, so that clogging by the aluminum compound can be prevented.

Further, according to the combustion apparatus of the second aspect of the present invention, the cleaning water supply means supplies the drain draining means with a larger amount of cleaning liquid than the supply amount of tap water from the tap water supply means. Drain water adhering to the drain drainage means and aluminum compounds and the like remaining at the time of neutralization can be reliably discharged by the wash water.

Further, according to the combustion apparatus of the third aspect of the present invention, since the cleaning water supply means supplies the heated cleaning water, the aluminum compound or the like is easily dissolved in the cleaning liquid and adheres to the drain drain means. Drain water, aluminum compounds, etc. can be reliably discharged.

Further, according to the combustion apparatus of the fourth aspect of the present invention, the cleaning water supply means operates at each preset timing, and therefore the cleaning water from the cleaning water supply means is drained at this timing. The drain water, the aluminum compound and the like attached to the drain drain means can be discharged.

According to the combustion apparatus of the fifth aspect of the present invention, since the cleaning water supply means operates in association with the end of combustion of the combustion burner, the cleaning water is supplied to the drain drain means in association with the end of combustion. Thus, the drain water generated during the combustion and the aluminum compound generated by the neutralization during the combustion can be efficiently discharged.

According to the sixth aspect of the combustion apparatus of the present invention, the cleaning water supply means supplies the cleaning water to the drain drain means each time combustion of the combustion burner is completed. Therefore, when drain water and aluminum compounds are generated, It can be discharged.

Further, according to the combustion apparatus of claim 7 of the present invention, since the cleaning water supply means supplies the cleaning water at a predetermined timing after the end of the combustion burner, the drain water generated during the combustion is almost drained. The cleaning water is supplied at the time when the water is discharged, and the generated drain water and the aluminum compound can be reliably and efficiently discharged when the water is generated.

According to the eighth aspect of the combustion apparatus of the present invention, since the cleaning water from the cleaning water supply means is pressure-fed by the feed pump, drain water, aluminum compound and the like are utilized by utilizing the water pressure of the cleaning water. It can be discharged more reliably.

Further, according to the ninth aspect of the present invention, since the cleaning water supply means supplies the cleaning water to the storage portion of the water sealing structure of the drain drainage means, the aluminum compound etc. accumulated in this storage portion. Can be discharged with the wash water.

[Brief description of drawings]

FIG. 1 is a simplified diagram schematically showing a first embodiment of a combustion device according to the present invention.

FIG. 2 is a flowchart showing a part of control of the combustion apparatus of FIG.

FIG. 3 is a flowchart showing a part of the control of the second embodiment of the combustion apparatus according to the present invention.

FIG. 4 is a flowchart showing a part of the control of the third embodiment of the combustion apparatus according to the present invention.

FIG. 5 is a simplified diagram schematically showing a part of a fourth embodiment of a combustion apparatus according to the present invention.

FIG. 6 is a flowchart showing a part of control of the combustion device of FIG.

FIG. 7 is a simplified diagram schematically showing a part of a fifth embodiment of a combustion apparatus according to the present invention.

FIG. 8 is a flowchart showing a part of control of the combustion device of FIG.

FIG. 9 is a partially enlarged cross-sectional view showing a water sealing structure of the drain drainage means and its vicinity in an enlarged manner.

[Explanation of symbols]

2,2A, 2B Combustion device 6 Combustion chamber 8 exhaust flow path 12 Combustion burner 30 yuan gas on-off valve 36 heat exchanger 38 Main heat exchanger section 40 Sub heat exchanger section 48 Drain drainage means 52 Drain drainage channel 54 Tap water supply means 60,60B Cleaning water supply means 62 Washing Water Supply Channel 64,94 on-off valve for cleaning 66 control means 82 Feed pump 92 Hot water supply channel for cleaning

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Sada Saito             4-1-2 Hirano-cho, Chuo-ku, Osaka City, Osaka             Gas Co., Ltd. F-term (reference) 3L034 EA07                 3L036 AA14

Claims (9)

[Claims] 1. A combustion burner for producing combustion exhaust gas,
A heat exchanger for recovering sensible heat and latent heat of combustion exhaust gas, and drain drainage means for collecting and discharging drain water generated in the heat exchanger by heat exchange with the combustion exhaust gas, and Tap water supply means for supplying tap water to the drain drain means, and supplying the tap water from the tap water supply means to the drain drain path of the drain drain means, whereby the drain discharge channel Which is a combustion device for neutralizing drain water flowing through the heat exchanger, wherein the heat exchanger is formed of aluminum or a material containing aluminum as a main component, and further related to the drain drainage means, the drain drainage means is washed. And a control means for controlling the cleaning water supply means. 2. The wash water supply means supplies to the drain drain means a quantity of wash water larger than the amount of tap water supplied from the tap water supply means to the drain drain means at the time of neutralization of drain water. The combustion apparatus according to claim 1, wherein the combustion apparatus is supplied. 3. The combustion apparatus according to claim 1, wherein the cleaning water supply means supplies the cleaning water heated to a predetermined temperature to the drain draining means. 4. The combustion apparatus according to claim 1, wherein the control unit operates the cleaning water supply unit at preset predetermined timings. 5. The combustion apparatus according to claim 1, wherein the control means operates the cleaning water supply means in association with the end of combustion of the combustion burner. 6. The combustion apparatus according to claim 5, wherein the control means operates the cleaning water supply means each time combustion of the combustion burner is completed. 7. The control means operates the cleaning water supply means at preset predetermined timings after completion of combustion of the combustion burner.
Combustion device as described. 8. The cleaning water supply means further includes a feed pump for pressure-feeding the cleaning water, and when the cleaning water is supplied from the wash water supply means, the control means causes the feed pump. 1 is operated.
The combustion device according to any one of 7. 9. The drain drain means includes a drain drain passage for draining drain water, and the drain drain passage is provided with a water sealing structure for preventing leakage of combustion exhaust gas. The cleaning water supply means supplies cleaning water to the storage part of the water-sealed structure.
The combustion device according to any one of 1.