JP4407783B2 - Exhaust gas drain treatment equipment for latent heat recovery type heat source machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust gas drain generated in a latent heat recovery type heat source apparatus having a latent heat recovery means for recovering latent heat of combustion exhaust gas for a circulation heating circuit having a heat exchanger heated by combustion heat, a circulation pump and an expansion tank. The present invention relates to an exhaust gas drain treatment device used for treating slag.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, it is well known that a heat exchanger such as a heat source for hot water heating is provided with a circulation heating circuit in which a heat exchanger heated by combustion heat, a circulation pump, and an expansion tank are arranged. In this product, the circulating fluid (water or antifreeze) is heated by a heat exchanger through an expansion tank, and the heated high-temperature water is sent to terminals such as underfloor heaters and radiators for indoor heating installed in a house. Then, it is returned to the expansion tank and circulated. The expansion tank is connected to a supplemental water pipe in order to maintain the water level of the circulating fluid in the expansion tank at a constant high water level, and the supplementary water is automatically supplemented by the supplementary water pipe.
[0003]
[Problems to be solved by the invention]
By the way, it is conceivable to provide latent heat recovery means for preheating by using the latent heat of the combustion exhaust gas for the heat exchanger of the hot water heating heat source. However, when the latent heat recovery means as described above is provided, a strong acid (for example, around pH 3) exhaust gas drain containing a nitrous acid gas component is generated by condensation in the latent heat recovery means. Separate equipment is required for processing such as sum processing.
[0004]
Therefore, it is conceivable to dilute the exhaust gas drain using replenishing water that is automatically replenished to the expansion tank. That is, as shown in FIG. 7, the exhaust gas drain generated in the latent heat recovery section is guided to the expansion tank 64 ′ by the drain introduction pipe 701, while the supplementary water is supplied from the supplementary water pipe 68 to the introduced exhaust gas drain to exhaust gas. It is conceivable to dilute the drain.
[0005]
However, the circulating liquid is returned to the expansion tank 64 'through the heating return pipe 71 from each terminal, and this circulating liquid is sent to the heat exchanger side through the heating inlet pipe 65. It is necessary to prevent contamination of exhaust gas drainage. In order to prevent this mixing, when exhaust gas drainage is introduced from the drain introduction pipe 701, it is conceivable that the circulating fluid flows from the heating return pipe 71 to the heating inlet pipe 65 without passing through the expansion tank 64 '. That is, it is conceivable that the heating return pipe 71 and the heating water inlet pipe 65 are directly connected by the bypass pipe 705 via the three-way switching valves 703 and 704 to bypass the expansion tank 64 '.
[0006]
However, if the heating return pipe 71 and the heating inlet pipe 65 are directly connected by the bypass pipe 705, the entire circulation heating circuit becomes a sealed circuit without being released into the atmosphere in the expansion tank 64 '. . For this reason, it becomes necessary to newly provide some pressure release means for the circulating heating circuit. In addition, if the three-way switching valves 703 and 704 are switched to the expansion tank 64 'side so that the flow of the circulating fluid passes through the expansion tank 64', the exhaust gas drainage is inevitably mixed into the circulating fluid. Due to this strong acidity, there is a risk of causing adverse effects such as corrosion of pipes.
[0007]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide an existing exhaust gas drain generated in a latent heat recovery type heat source device having an expansion tank without newly installing special equipment. An object of the present invention is to provide an exhaust gas drain treatment apparatus capable of performing effective treatment using equipment.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a latent heat recovery means for recovering the latent heat of combustion exhaust gas for heat exchange with respect to a heat exchange circuit including an expansion tank and a heat exchanger heated by combustion heat. The following specific items are provided for the drain processing device of the latent heat recovery type heat source machine to which is attached.
[0009]
That is, the apparatus includes a drain treatment tank that guides exhaust gas drain generated in the latent heat recovery means and processes the guided exhaust gas drain. In addition, a replenishment pipe for replenishing make-up water is connected to the expansion tank, and the replenishment water that overflows the expansion tank and the drain treatment tank due to refill water to the expansion tank is supplied to the drain treatment tank. Connect as follows. And it is set as the basic specific matter that the drain treatment tank is configured to receive supply of the makeup water for the overflow and dilute the exhaust gas drain in the drain treatment tank.
[0010]
Here, as the “heat exchange circuit”, there is a circulation heating circuit that directly constitutes a hot water heater or the like in that an expansion tank is required. Any one or two or more types of fired circulation circuits may be combined. At that time, the latent heat recovery means is provided in any one or more heat exchange circuits of a circulation heating circuit, a hot water supply circuit, or a bath recirculation circuit. As long as the utilization efficiency of heat is improved, it is sufficient. That is, the latent heat recovery means is attached to a heat exchange circuit other than the circulation heating circuit, and the exhaust gas drain generated by the latent heat recovery means is diluted in conjunction with the expansion tank.
[0011]
  the aboveBasic specific mattersAccording to the above, in the drain treatment tank, exhaust gas drain generated from the latent heat recovery means is guided, while supply water overflowing from the expansion tank is supplied, and the exhaust gas drain is diluted by the supplied supply water. Become. As a result, there is no possibility of exhaust gas drainage being mixed into the circulating fluid in the circulating heating circuit, and the exhaust water drain is effectively diluted to the extent that the exhaust water drain can be drained by effectively using the replenishment water from the existing supplemental water pipe to the expansion tank. Will be. The diluted exhaust gas drain may be drained every time it is diluted, that is, every batch dilution process, or it may be drained while being diluted, that is, continuously diluted.AndThe drain treatment tankIsFrom the viewpoint of minimizing the production and increasing the number of manufacturing steps, a drain treatment tank is newly added to the normal expansion tank when the existing or latent heat recovery means is not provided, or It is preferable to make use of the internal space of the existing or normal expansion tank described above to form a drain treatment tank in the expansion tank.Yes.
[0012]
  In the present invention,Drain treatment tank is integrally formed in the expansion tankIn order toAdded the following specific itemsis doing.That is, as an expansion tank, the inside of the expansion tank is partitioned by a partition wall between a water replenishment tank for replenishing the circulating fluid and a drain treatment tank, and replenishment water supplemented to the water replenishment tank overflows the partition wall. May be configured to be supplied to the drain treatment tank. In this case, even if an existing or normally used expansion tank is used, the function inherent to the expansion tank can be exhibited by the above-mentioned water reserving tank only by partitioning the inside of the expansion tank with a partition wall. A drain treatment tank can also be provided in a state in which mixing with the circulating fluid in the replenishing tank is reliably prevented.
[0013]
In the above invention, regardless of the amount of exhaust gas drain introduced into the drain treatment tank, that is, the amount of exhaust gas drain generated in the latent heat recovery means, overflow of makeup water from the expansion tank is continued anyway, and the exhaust gas drain Although dilution may be performed more and more, it is preferable to perform the following dilution control from the viewpoint of ensuring the necessary dilution processing and avoiding waste of makeup water.
[0014]
That is, as the first dilution control, a drain amount detecting means for detecting the drain amount of the exhaust gas drain led to the drain treatment tank is provided, and when the set drain amount is detected by the drain detection means, the drain treatment tank On the other hand, a dilution control means is provided for controlling the water replenishment operation by the water refilling pipe so that the overflow water of a predetermined dilution level is supplied. In this case, an electrode for detecting that the exhaust gas drain in the drain treatment tank has reached the water level corresponding to the set drain amount is used as the drain amount detecting means, and when the set drain amount is detected by this electrode. A flow switch that uses the pressure sensor for the drain amount of the exhaust gas drain in the drain treatment tank as a drain amount detection means or a float that uses a float to change the water level. And the storage of the set drain amount may be detected based on the respective detection values. These are suitable as dilution control for performing batch type dilution treatment. In addition, when detecting said drain amount itself or a water level fluctuation | variation, a continuous dilution process is attained by controlling a rehydration operation | movement continuously according to the introduction amount of waste gas drain.
[0015]
As the second dilution control, a combustion amount detecting means for detecting the combustion amount is provided, and when the integrated value of the detected combustion amount output by the combustion amount detecting means reaches the set integrated combustion amount, the drain treatment tank is previously set. A dilution control means for controlling the water replenishment operation by the water refilling pipe is provided so as to supply an amount of overflow water that has a predetermined dilution degree based on the relationship between the obtained integrated combustion amount and the exhaust gas drain generation amount. As the combustion amount detection means, any one of the combustion capacity as the combustion amount, the combustion duration time, the product of the combustion capacity and the elapsed combustion time, or the like may be detected. At this time, as the combustion capacity, a calorific value determined in advance according to the design specifications (for example, nozzle diameter, fuel gas supply pressure, etc.) of the combustion burner may be used, or the supply gas to the combustion burner may be used. By detecting the current value applied to adjust the valve opening of the gas electromagnetic proportional valve for adjusting the amount, the gas consumption corresponding to the applied current value, that is, the calorific value, may be obtained. Good. This is because the exhaust gas drain generation amount is approximately proportional to the combustion exhaust gas amount, and the combustion exhaust gas amount is approximately proportional to the combustion amount. Therefore, the relationship between the above combustion amount and the exhaust gas drain generation amount is obtained in advance by a test or the like. The exhaust gas drain generation amount is predicted based on the obtained relationship, and dilution control is performed. In this case, it is possible to omit the drain amount detection means that was necessary in the first dilution control, and a simpler apparatus configuration can be achieved.
[0016]
Moreover, in each above invention, you may make it arrange | position the neutralizing agent which neutralizes exhaust gas drain so that it may contact with exhaust gas drain with respect to a drain treatment tank. In this case, the exhaust gas drain introduced into the drain treatment tank can be neutralized even before it is diluted with makeup water, and in addition to this neutralization treatment, replenishment is performed. Dilution treatment with water can also be performed on the exhaust gas drain.
[0017]
【The invention's effect】
As described above, according to the exhaust gas drain treatment apparatus for a latent heat recovery type heat source device of the present invention, an exhaust tank that is generated in the latent heat recovery type heat source device can be used for an expansion tank without newly installing special equipment. An effective dilution process can be performed using the existing water refilling pipe.
[0018]
  In addition, in particular, as an expansion tank, the inside of the expansion tank is divided into a replenishing tank for replenishing the circulating fluid and a drain treatment tank by a partition wall, and the replenishing water supplemented to the replenishing tank overflows the partition wall. Because it is configured to be supplied to the drain treatment tank byThe exhaust gas drain can be diluted most simply and compactly.
[0019]
  Claims2Or claims3According to this, it is possible to achieve both of ensuring the necessary dilution treatment for the exhaust gas drain and saving by preventing waste of the makeup water used for dilution.
[0020]
Furthermore, according to the fourth aspect, it is possible to perform a greater detoxification process on the exhaust gas drain.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
FIG. 1 shows an example of a latent heat recovery type heat source device to which an embodiment of the present invention is applied. The heat source unit 20 is a composite heat source unit having functions of hot water supply, heating, and bathing. In the figure, 21 is a hot water supply circuit, 22 is a heating circuit as a circulation heating circuit, 23 is a reheating circuit, and 24 is a controller including dilution control means for performing operation control and dilution control of these circuits. The reheating of the bath by the heat source machine 20 is a type of reheating by increasing the temperature of the hot water of the reheating circuit 23 by exchanging heat between the hot water of the heating circuit 22 and the hot water of the reheating circuit 23. Is. Hereinafter, each main component 21, 22, 23, 24 of the said heat source machine 20 is demonstrated.
[0023]
(Hot water supply circuit 21)
The hot water supply circuit 21 includes a hot water supply casing (can) 32 that forms a hot water supply combustion chamber 31, a hot water supply heat exchanger 33 that is disposed above the combustion chamber 31 in the casing 32, and this heat exchange. A hot water supply burner 34 disposed below the heater 33, a hot water supply fuel supply system 35 for supplying fuel gas to the burner 34, a blower fan 36 for supplying combustion air to the burner 34, and the hot water supply The hot water supply water intake pipe 37 and the hot water supply hot water discharge pipe 38 connected to the heat exchanger 33 are provided.
[0024]
The hot water supply fuel supply system 35 includes a common open / close solenoid valve 39, a hot water supply gas pipe 40, and a hot water supply electromagnetic proportional valve 41 that changes and adjusts the amount of fuel gas supplied to the burner 34.
[0025]
Water such as tap water supplied to the hot water supply heat exchanger 33 through the water inlet pipe 37 is heated by the combustion heat of the hot water burner 34 while passing through the heat exchanger 33, and passes through the hot water outlet pipe 38. Hot water is supplied to predetermined hot water supply locations such as a curan 44 such as a kitchen and the reheating circuit 23. An incoming water flow sensor 45 and an incoming water thermistor 46 are installed in the hot-water supply incoming pipe 37, and an outgoing hot water thermistor 47 is installed in the hot-water hot-water supply pipe 38.
[0026]
(Heating circuit 22)
The heating circuit 22 includes a heating casing (can) 52 that forms a heating combustion chamber 51, a heating main heat exchanger 53 that is heated by the combustion heat of the heating burner 54, and fuel gas to the burner 54. Is provided with a heating fuel supply system 55 for supplying air, a heating blower fan 56 for supplying combustion air to the burner 54, and a heating circulation passage 57 passing through the main heat exchanger 53. The casing 52 is provided with a sub-heat exchanger 58 as a latent heat recovery means. The sub-heat exchanger 58 is passed through a heating circulation passage 57 to exchange the heat with the latent heat of the combustion exhaust gas. Prior to heating in the main heat exchanger 53, preheating is performed. Further, a drain receiving portion 59 as a drain collecting means is disposed at a lower position of the auxiliary heat exchanger 58, and is generated by condensation due to the heat exchange in the auxiliary heat exchanger 53 by the drain receiving portion. The exhaust gas drain is collected and collected. The exhaust gas drain collected by the drain receiving portion 59 is guided to a drain treatment tank 643 (see FIG. 2) of the expansion tank 64 described later through a drain introduction pipe 591.
[0027]
The heating fuel supply system 55 includes the common open / close electromagnetic valve 39, the heating gas pipe 60, and a heating electromagnetic proportional valve 61 that changes and adjusts the amount of fuel gas supplied to the burner 54. Yes.
[0028]
The heating circulation passage 57 includes an expansion tank 64 interposed in the middle, a heating water inlet pipe 65 extending from the expansion tank 64 to the main heat exchanger 53, and the expansion tank from the main heat exchanger 53. There are 64 hot water supply pipes 66 up to 64. A downstream end of a supplementary water pipe 68 branched from a hot water supply water inlet pipe 37 is connected to a later-described supplementary water tank 642 (see FIG. 2) of the expansion tank 64, and water is injected into the supplementary water tank 642 and the inside of the supplementary water tank 642. The automatic replenishment of makeup water when the water level drops is performed based on detection signals from the high water level switch 644 (see FIG. 2) and the low water level switch 645. The heating inlet pipe 65 is provided with a heating circulation pump 67 that circulates the hot water in the auxiliary water tank 642 through the heating circulation passage 57 and the like. It is arrange | positioned so that it may pass along the below-mentioned reheating heat exchanger 81 in the middle.
[0029]
An upstream end of the low temperature heating pipe 69 is branched and connected to an intermediate position of the heating inlet pipe 65, and a plurality (six in the illustrated example) of the thermal valves 721 and 722 are connected to the downstream end of the low temperature heating pipe 69. .. (See FIG. 2) is connected to a 6P header 72. As shown in FIG. 2, the upstream ends of the circulation pipes directed to the low temperature terminal radiators 11, 12... Outside the heat source unit 20 are individually connected to the thermal valves 721, 722. Low-temperature water (for example, 60 ° C.) from the low-temperature heating pipe 69 is branched in parallel to the terminal radiators 11, 12. Each of the low-temperature terminal radiators 11, 12,... Is composed of a floor heating radiation panel or a radiation tube installed in each room of the building.
[0030]
The upstream end of the high-temperature heating pipe 70 is branched and connected to the heating hot water pipe 66 at an intermediate position between the main heat exchanger 53 and the reheating heat exchanger 81, and downstream of the high-temperature heating pipe 70. Is provided with a downstream connection end 701. The downstream connection end 701 includes an upstream end side of the circulation pipe 14 for supplying high-temperature water (for example, 80 ° C.) to one or more (one example is shown in FIG. 2) high-temperature terminal radiator 13. Connected. The high-temperature terminal radiator 13 is constituted by, for example, a bathroom dryer or an indoor heater.
[0031]
The upstream end of the heating bypass pipe 75 is branched from the high temperature heating pipe 70 in front of the downstream connection end 701, and the downstream end of the heating bypass pipe 75 is connected to the heating return pipe 71 in front of the expansion tank 64. Connected to join. The downstream connection ends 711 of the heating return pipe 71 are connected to the downstream ends of the circulation pipes passing through the low-temperature and high-temperature terminal radiators 11, 12, and 13.
[0032]
Returning to FIG. 1, reference numeral 73 in FIG. 1 is a forward thermistor for detecting the temperature of outgoing hot water from the main heat exchanger 53, and reference numeral 74 is a return thermistor 74 for detecting the temperature of the return hot water. . Further, reference numeral 76 denotes a bath thermal valve 76. When the bath thermal valve 76 is closed, the hot water in the heating outlet pipe 66 flows only into the high-temperature heating pipe 70.
[0033]
(Turning circuit 23)
The reheating circuit 23 includes the reheating heat exchanger 81, a recirculation circulation passage 82 that passes through the heat exchanger 81, a recirculation circulation pump 83 that circulates hot water through the circulation passage 82, A hot water supply pipe 84 that branches off from the hot water supply hot water supply pipe 38 and pours hot water into the circulation channel 82 is provided.
[0034]
The recirculation circulation channel 82 includes a bath return pipe 85 extending from a bathtub (not shown) to the reheating heat exchanger 81 and a bath return pipe 86 extending from the reheating heat exchanger 81 to the bathtub. Has been. The bath return pipe 85 is provided with the circulation pump 83 and connected to the downstream end of the pouring pipe 84. The pouring pipe 84 is provided with a hot water amount sensor 87 for detecting the flow rate of the pouring pipe 84 and an electromagnetic on-off valve 88. In addition, the bath return pipe 85 is provided with a pressure sensor 89 for detecting the water level in the bathtub.
[0035]
(Controller 24)
The controller 24 controls the operation of each of the heat exchange circuits 21, 22, 23 in response to various operation commands based on the input operation of the user or the test run operator from the remote controller 240 constituting the notification means. And a memory. The controller 24 includes portions for controlling normal operation such as hot water supply control means, bath reheating control means and heating control means corresponding to the circuits 21, 22, and 23, and dilution control means for exhaust gas drain. Yes.
[0036]
Based on the above configuration, each embodiment for performing dilution treatment of exhaust gas drain is configured as follows.
<First Embodiment>
In the first embodiment, as shown in FIG. 2, the interior of the expansion tank 64 is partitioned into a water replenishing tank 642 and a drain treatment tank 643 by a partition wall 641. On the other hand, the exhaust gas drain introduced through the drain introduction pipe 591 by the drain treatment tank 643 is diluted.
[0037]
A water replenishing valve 681 constituted by an electromagnetic on-off valve is interposed in a water refilling pipe 68 for replenishing makeup water to the water replenishing tank 642, and water replenishment to the water replenishing tank 642 is performed by opening / closing control by the controller 24 of the water replenishing valve 681. It has come to be. Normally, when the water level as the circulating fluid in the replenishing tank 642 is lowered to a predetermined low water level, the low water level is detected by the low water level switch 645, and the controller 24 which receives the output of this detection signal causes the above-mentioned water refill valve. 681 is opened and rehydration is started. When the high water level switch 644 detects that the water level has reached a predetermined high water level, the controller 24 that has received the output of the detection signal closes the water replenishing valve 681 and stops water replenishment. . Thereby, the replenishing tank 642 is always maintained in a state where water is stored up to the high water level. Note that any type of high water level switch 644 and low water level switch 645 may be used, but generally an electrode type or float switch type may be employed.
[0038]
On the other hand, an upstream end of a drain pipe 593 for draining the treated water after dilution is communicated with the bottom surface of the drain treatment tank 643, and a drain valve 592 constituted by an electromagnetic on-off valve interposed in the drain pipe 593 is provided. By being opened, the treated water in the drain treatment tank 643 is drained.
[0039]
Next, the dilution process control will be described based on the flowchart of FIG. The following employs a batch dilution process. First, it is determined whether or not the burner 54 has started combustion by checking whether or not the combustion operation is being performed (step S1). When combustion is started, a first timer (not shown) built in the controller 24 is started to integrate the combustion time. During this time, the exhaust gas drain generated in the auxiliary heat exchanger 58 is collected in the drain receiving portion 59 and then led to the drain treatment tank 643 through the drain introduction pipe 591. And the drain amount in the drain processing tank 643 increases corresponding to progress of combustion time.
[0040]
Next, when the integrated combustion time value reaches the set integrated combustion time value T1, the supplementary water valve 681 is opened (steps S2 and S3). As the set cumulative combustion time value T1, the relationship between the combustion elapsed time and the amount of exhaust gas drain (drain amount) generated within the combustion elapsed time when combustion is continued with the average combustion capacity of the burner 54 is previously set. It may be determined by a test or the like, and a combustion elapsed time value required until a predetermined drain amount that is predetermined as a dilution target in one batch process is obtained from the above relationship.
[0041]
A second timer (not shown) built in the controller 24 is started in synchronization with the opening operation of the water refill valve 681 to accumulate the elapsed time (valve opening elapsed time) in the open state of the water refill valve 681. Thereby, replenishment of an amount of make-up water proportional to the valve opening elapsed time is continuously performed on the refill water tank 642.
[0042]
When the valve opening elapsed time value reaches the set valve opening elapsed time value T2, the refill valve 681 is closed (steps S4 and S5), and the drain valve 592 is opened to open the drain treatment tank 643. Drain all the treated water after being diluted to a predetermined dilution. Thereby, one cycle of batch processing is completed. As the set valve opening elapsed time value T2, the amount of water to be supplied to the replenishing tank 642 is proportional to the valve opening elapsed time, and therefore, it is necessary to increase the water level from the high water level to the upper edge position of the partition wall 642 in the refilling tank 642. An elapsed time value required for the supplementary water amount to reach the total water amount of the water level rising water amount and the overflow water amount necessary for making the exhaust gas drain of the set drain amount a predetermined dilution is set.
[0043]
Finally, the first and second timers are reset, and the processes from step S1 to step S6 are repeated as long as the combustion operation of the burner 54 continues.
[0044]
Second Embodiment
FIG. 4 shows the expansion tank 64 of the second embodiment. In addition, about the same component as 1st Embodiment, the same code | symbol as 1st Embodiment is attached | subjected and the detailed description is abbreviate | omitted.
[0045]
In the second embodiment, a water level electrode 647 serving as a drain amount detecting means is disposed in the drain treatment tank 643, and the water level (when the exhaust gas drain having the set drain amount is stored by the water level electrode 647 ( The set water level) is detected, and the detection signal is output to the controller 24 as the control timing for starting the refilling.
[0046]
The dilution control in the second embodiment employs a batch type dilution process as in the first embodiment. First, as shown in FIG. 5, it is determined whether or not the burner 54 has started combustion by checking whether or not the combustion operation is in progress (step S11). When the combustion is started, when the detection signal of the set water level is output after the detection signal is output from the water level electrode 647, the supplementary water valve 681 is opened (steps S12 and S13). While waiting for the output of the set water level detection signal, the exhaust gas drain generated in the auxiliary heat exchanger 58 is collected in the drain receiving portion 59 and then guided to the drain treatment tank 643 through the drain introduction pipe 591. When the drain amount in the drain treatment tank 643 reaches the set drain amount corresponding to the set water level, the replenishing valve 681 is opened to start refilling.
[0047]
In synchronization with the opening operation of the refill valve 681, a timer (not shown) built in the controller 24 is started to integrate the valve opening elapsed time of the refill valve 681. Thereafter, the same processes (steps S14 to S16) as steps S4 to S6 of the first embodiment are performed. As a result, the amount of makeup water necessary to dilute the exhaust gas drain of the set drain amount to a predetermined dilution amount overflows into the drain treatment tank 643, and the treated water after being diluted to the predetermined dilution amount is open. All the water is drained through the drain valve 592 and the drain pipe 593, and the batch processing of one cycle is completed.
[0048]
Then, the first and second timers are reset, and the processes from step S11 to step S16 are repeated as long as the combustion operation of the burner 54 continues.
[0049]
A pressure sensor indicated by 648 in FIG. 4 may be used as the drain amount detection means. In the case of this pressure sensor 648, the drain amount of the exhaust gas drain that accumulates sequentially in the drain treatment tank 643 is detected as the water pressure value. For this reason, compared with the case where the water level electrode 647 is used, it becomes possible to change and set the set drain amount of the exhaust gas drain for performing batch processing once with respect to the controller 24. Appropriate change settings can be made according to the degree of exhaust gas drain generation that causes slight fluctuations in accordance with fluctuations in the outside air temperature.
[0050]
<Third Embodiment>
FIG. 6 shows an expansion tank 64 of the third embodiment. In addition, about the same component as 1st Embodiment, the same code | symbol as 1st Embodiment is attached | subjected and the detailed description is abbreviate | omitted.
[0051]
In the third embodiment, the upstream end of the drain pipe 593a for draining the treated water in the drain treatment tank 643 is opened at a predetermined intermediate water level unlike the first and second embodiments. So connected. The replenishing valve interposed in the replenishing pipe 68 is constituted by an electromagnetic proportional valve, and the valve opening, that is, the replenishing water flow rate of the replenishing water is controlled by the controller 24.
[0052]
Unlike the first and second embodiments, the dilution control in the third embodiment employs a continuous dilution process. First, when the burner 54 starts combustion, the degree of the combustion capacity is seen, and the exhaust gas drain flow rate generated per unit time corresponding to the combustion capacity is fetched from the relation table set in advance. Next, a target replenishment flow rate per unit time necessary for diluting the exhaust gas drain at the exhaust gas drain flow rate to a predetermined dilution is obtained by calculation.
[0053]
First, water is replenished at the maximum flow rate with the valve opening of the water refill valve 681a being maximized until the water level in the water reserving tank 642 rises from the high water level to the upper edge position of the partition wall 642. Next, the valve opening is changed to the valve opening corresponding to the target water refill flow rate, and the changed valve opening is maintained. Thereby, the replenishing water of the target replenishing flow rate overflows the partition wall 641 and is continuously replenished to the drain treatment tank 643. Thereafter, as long as the combustion operation of the burner 54 is continued and the combustion capacity is not changed, the replenishing water having the target replenishing flow rate is continuously supplied to the drain treatment tank 643 due to overflow. Then, if the water level of the exhaust gas drain in the drain treatment water tank 643 rises to the opening position of the drain pipe 593a, the treated water after the dilution process is continuously drained through the drain pipe 593a.
[0054]
When the combustion capacity is changed during the combustion operation of the burner 54, the target water refill flow rate is changed based on the changed combustion capacity, and the valve opening degree of the water refill valve 681a is changed to the target water refill flow rate after the change. It may be changed corresponding to the above, and water replenishment may be performed continuously.
[0055]
<Other embodiments>
In addition, this invention is not limited to the said 1st-3rd embodiment, Other various embodiments are included. That is, in the first to third embodiments, the auxiliary heat exchanger 58 as the latent heat recovery means is provided only in the heating circuit 22, but not limited to this, the auxiliary heat exchanger 58 is also provided in the casing 32 of the hot water supply circuit 21. It may be. In this case, the exhaust gas drain from both the heating circuit 22 and the hot water supply circuit 21 may be guided to the expansion tank 64 to perform the dilution process.
[0056]
In the said 1st-3rd embodiment, although each heat exchanger of the heating circuit 22 and the hot water supply circuit 21 is comprised by 1 can 1 circuit type, it is not restricted to this, The said heating circuit 22 and the hot water supply circuit 21 are 1 Heating may be performed by a can two-circuit type heat exchanger, and the above-described latent heat recovery means may be provided in addition to the heat exchanger to dilute the exhaust gas drain from both circuits 21 and 22.
[0057]
In the stage before the neutralizing agent M (see FIGS. 2, 4, and 6) is set on the bottom of the drain treatment tank 643 in the first to third embodiments, and the dilution process is performed with supplementary water. The neutralization treatment may be performed preliminarily by contacting with exhaust gas drain.
[0058]
In the first or second embodiment, the amount of water to be replenished from the replenishment pipe 68 to the drain treatment tank 643 is determined based on the valve opening elapsed time. A means (flow rate sensor) may be provided to control the replenishment amount directly based on the detected flow rate.
[0059]
In the first to third embodiments, water is circulated in the heating circuit. However, the present invention is not limited to this, and an antifreeze liquid may be used as the circulating liquid. Even in this case, since the antifreeze liquid is stored in the downward direction and the makeup water is stored in the upper direction based on the difference in specific gravity, the dilution treatment of the exhaust gas drain according to the present invention can be performed reliably. . In this case, strictly speaking, although the antifreeze is slightly diluted with make-up water, both are not forcibly stirred, so the degree of dilution is the antifreeze used as the circulating fluid. Can be suppressed to the extent that there is no problem. In addition, in order to prevent as much as possible the stirring action during the replenishment of the makeup water, the supplementary water from the supplemental water pipe 68 is not directly dropped into the supplementary water tank 642 but directly, instead of being dropped directly. You can do it. For example, it may be dropped in a dispersed state after being once applied to a buffer plate or the like, or may be gradually dropped from a large number of small holes like rain dew.
[0060]
Further, the latent heat recovery means may be configured by means other than the auxiliary heat exchanger 58 as in the first to third embodiments.
[Brief description of the drawings]
FIG. 1 is an overall schematic diagram showing a latent heat recovery heat source machine to which an embodiment of the present invention is applied.
FIG. 2 is an enlarged schematic view showing the first embodiment.
FIG. 3 is a flowchart showing dilution control of the first embodiment.
FIG. 4 is a view corresponding to FIG. 2 showing a second embodiment.
FIG. 5 is a flowchart showing dilution control of the second embodiment.
FIG. 6 is a view corresponding to FIG. 2 showing a third embodiment.
FIG. 7 is an explanatory diagram showing a configuration conceived for extracting a problem.
[Explanation of symbols]
22 Heating circuit (circulation heating circuit, heat exchange circuit)
24 controller (dilution control means)
53 Main heat exchanger (heat exchanger)
58 Sub heat exchanger (latent heat recovery means)
64 Expansion tank
67 Circulation pump
68 Refill pipe
641 partition wall
642 Water tank
643 Drain treatment tank
647 Water level electrode (Drain amount detection means)
648 Pressure sensor (Drain amount detection means)
M neutralizer

Claims (4)

Drain of a latent heat recovery type heat source apparatus provided with latent heat recovery means for recovering latent heat of combustion exhaust gas for heat exchange with respect to a heat exchange circuit having an expansion tank and a heat exchanger heated by combustion heat A processing device comprising:
The exhaust gas drain generated in the latent heat recovery means is led and a drain treatment tank for treating the led exhaust gas drain is provided,
The expansion tank is connected to a replenishment pipe for replenishing makeup water, and the expansion tank and the drain treatment tank are supplied with the makeup water overflowed by the supplementary water to the expansion tank. Connected to
The drain treatment tank is configured to dilute the exhaust gas drain in the drain treatment tank in response to the supply of makeup water for the overflow,
The expansion tank is partitioned by a partition wall between a water replenishing tank for replenishing the circulating fluid and a drain treatment tank,
Makeup water is rehydration in the auxiliary water tank has been configured to be supplied to the drain treatment tank by overflowing the partition wall,
Exhaust Gasudoren processing apparatus of the latent heat recovery type heat source machine, characterized in that. An exhaust gas drain treatment apparatus for a latent heat recovery type heat source machine according to claim 1 ,
Drain amount detecting means for detecting the drain amount of the exhaust gas drain led to the drain treatment tank;
And a dilution control means for controlling a water replenishment operation by the water refilling pipe so as to supply an amount of overflow water having a predetermined dilution degree to the drain treatment tank when a set drain amount is detected by the drain amount detection means. An exhaust gas drain treatment device for a latent heat recovery type heat source machine. An exhaust gas drain treatment apparatus for a latent heat recovery type heat source machine according to claim 1 ,
A combustion amount detection means for detecting the combustion amount;
When the integrated value of the detected combustion amount output by the combustion amount detecting means reaches the set integrated combustion amount, a predetermined dilution degree is obtained based on the relationship between the integrated combustion amount obtained in advance for the drain treatment tank and the exhaust gas drain generation amount. An exhaust gas drain treatment apparatus for a latent heat recovery type heat source device, comprising dilution control means for controlling a replenishment operation by a replenishment pipe so as to supply a certain amount of overflow water. An exhaust gas drain treatment apparatus for a latent heat recovery type heat source machine according to any one of claims 1 to 3 ,
An exhaust gas drain treatment apparatus for a latent heat recovery type heat source device, wherein a neutralizing agent for neutralizing exhaust gas drain is disposed in the drain treatment tank so as to come into contact with the exhaust gas drain.

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