JP4942709B2 - Latent heat recovery type heat source machine - Google Patents

Description

  The present invention relates to a latent heat recovery type heat source apparatus that recovers latent heat in combustion exhaust gas of a burner and heats a heat medium.

  Conventionally, a heating circulation circuit that is connected to a radiator and the heat medium is circulated by a circulation pump, a main heat exchanger that is interposed in the heating circulation circuit and heats the heat medium by combustion of a burner, and a heating circulation circuit An auxiliary heat exchanger that recovers the latent heat of the combustion exhaust gas from the burner, a drain pan that is disposed below the auxiliary heat exchanger and that recovers the drain generated by the auxiliary heat exchanger, and the drain recovered by the drain pan is neutralized Connected to the upper part of the cistern, a neutralizer that is installed in the circulation circuit for heating, a heat medium supply pipe that supplies the heat medium to the cistern, an on-off valve that is provided in the heat medium supply pipe Latent heat provided with an overflow pipe that discharges the heat medium when the heat medium in the systern exceeds the upper limit, and a controller that opens the opening / closing valve of the heat medium supply pipe when the heat medium in the systern is less than a predetermined amount Recovery Heat source equipment is known (e.g., see Patent Document 1).

  By the way, in the neutralizer that neutralizes the drain generated in the auxiliary heat exchanger, the product generated during the neutralization reaction adheres to the surface of the neutralizer filled inside, and the neutralization performance gradually decreases. There is a problem.

In order to solve this problem, the neutralizer is connected to a cleaning pipe that supplies tap water from the water pipe, and the on-off valve provided in the cleaning pipe is opened according to the command from the controller of the heat source unit to neutralize it. A device for cleaning a vessel is also known (see, for example, Patent Document 2). By applying this neutralizer cleaning structure to the latent heat recovery type heat source machine, it is possible to suppress a decrease in neutralization performance of the neutralizer.
JP 2006-336939 A JP 2001-272110 A

  In the latent heat recovery type heat source device to which the conventional neutralizer cleaning structure is applied, it is necessary to newly provide a cleaning pipe and an on-off valve, and there is a problem that the manufacturing cost increases and the heat source device becomes relatively large. .

  An object of this invention is to provide the latent heat recovery type heat source machine which can wash | clean a neutralizer, without providing new piping and an on-off valve for washing | cleaning in view of the above point.

  To achieve the above object, the present invention provides a heating circulation circuit connected to a radiator and circulating a heat medium by a circulation pump, and a main heat that heats the heating medium by combustion of a burner interposed in the heating circulation circuit. An exchanger, an auxiliary heat exchanger that is interposed in the heating circulation circuit and recovers the latent heat of the combustion exhaust gas of the burner, a drain pan that is disposed below the auxiliary heat exchanger and recovers the drain generated in the auxiliary heat exchanger, Neutralizer for neutralizing drain collected in the drain pan, cistern interposed in the heating circulation circuit, heat medium supply pipe for supplying the heat medium to the cistern, and opening / closing provided in the heat medium supply pipe A valve, an overflow pipe for discharging the heat medium when the heat medium in the cistern exceeds an upper limit amount, and a controller for opening the on-off valve of the heat medium supply pipe when the heat medium in the cistern is less than a predetermined amount; Latent heat recovery A heat source machine has been improved as follows.

  That is, in the present invention, the overflow pipe of the cistern is connected to the neutralizer, and the controller opens the on-off valve of the heat medium supply pipe, sets the heat medium in the cistern to an amount exceeding the upper limit, and sets the heat medium to the overflow pipe. The neutralization device is supplied via a heat treatment, and the neutralization device is washed with a heat medium.

  According to the present invention, the overflow pipe of the cistern is connected to the neutralizer, and the heat medium in the cistern is set to an amount exceeding the upper limit by opening the on-off valve of the heat medium supply pipe by the cleaning process of the controller. The heat medium is supplied to the neutralizer through the overflow pipe, and the neutralizer is washed with the heat medium. Thereby, the neutralization reaction product adhering to the surface of the neutralizing agent filled in the neutralizer can be washed away, and the decrease in neutralization performance of the neutralizer can be suppressed.

  In addition, it is possible to clean the neutralizer by simply connecting the overflow pipe of the cistern to the neutralizer and adding a cleaning process to the controller, and it is necessary to provide a new pipe for cleaning and an open / close valve as before. There is no. Therefore, it is possible to reduce the manufacturing cost without increasing the size of the latent heat recovery type heat source device.

  With reference to FIG. 1, reference numeral 1 denotes a latent heat recovery type heat source machine, which constitutes a hot water heating system that performs heating by circulating hot water heated by the heat source machine 1 to a heating radiator 2 such as a floor heating panel. . The heat source device 1 is provided with a combustion soot 3, and a burner 4 and a heat exchanger 5 heated by the burner 4 are accommodated in the combustion soot 3. Combustion air is supplied into the combustion soot 3 by a combustion fan 6.

  A gas main valve 41 and a gas proportional valve 42 are interposed in the gas passage 40 for supplying fuel gas to the burner 4. The burner 4 is composed of a plurality of unit burners 4a. These unit burners 4a are assembled into three burner groups 4b, and the gas passages 40 are branched for each burner group 4b of the unit burner 4a on the downstream side of the gas proportional valve 42, and each burner group 4b is divided into each branch path. A capacity switching valve 43 for supplying fuel gas is provided. Thus, the combustion amount of the burner 4 can be varied over a wide range by combining the control of the capacity switching valve 43 and the control of the gas proportional valve 42.

  The heat exchanger 5 includes a main heat exchanger 51 disposed immediately above the burner 4 and a sub heat exchanger 52 disposed in an exhaust passage through which combustion exhaust gas that has passed through the main heat exchanger 51 flows. In the auxiliary heat exchanger 52, water vapor in the combustion exhaust gas is condensed and latent heat is recovered. When the latent heat is recovered, drain is dripped from the auxiliary heat exchanger 52. This drain is recovered by the drain pan 52a disposed immediately below the auxiliary heat exchanger 52 and guided to the neutralizer 52b, and the neutralizer 52b. The water is neutralized and drained from the drain pipe 52c.

  In addition, the heat source unit 1 is provided with a heating circulation circuit 7 for circulating hot water between the heat exchanger 5 and the heating radiator 2 by a circulation pump 7a. The heat source unit 1 includes a systern 8 interposed in the heating circulation circuit 7. The heating circulation circuit 7 includes a heating forward pipe 71 that guides the hot water heated by the main heat exchanger 51 to the heating radiator 2, and a heating return pipe that guides the hot water radiated by the heating radiator 2 to the auxiliary heat exchanger 52. 72, a first connection pipe 73 that guides the hot water whose latent heat in the combustion exhaust gas has been recovered by the auxiliary heat exchanger 52 to the systole, and a second connection pipe 74 that guides the hot water in the cistern 8 to the main heat exchanger 51. Composed. The circulation pump 7 a is interposed in the second connection pipe 74.

  A bypass path 71 a that guides a part of the hot water heated by the main heat exchanger 51 to the systern 8 is connected to the piping 71 for heating. Thereby, even if the burner 4 is burning due to a failure or the like when the heating radiator 2 is stopped, the second connection pipe 74 and the main heat exchange are activated by operating the circulation pump 7a. The hot water can be circulated through the heater 51, the heating forward pipe 71, the bypass passage 71a, and the cistern 8, and the main heat exchanger 51 can be prevented from being abnormally heated.

  The cistern 8 is replenished with water as a heat medium through a heat medium supply pipe 80 provided with an on-off valve 80a. Then, two water level electrodes 81 and 82 for detecting a low water level and a high water level are provided in the cistern 8, and when the water level in the cistern 8 falls below a predetermined amount, that is, when the water level falls below the low water level electrode 81, the on-off valve Water is replenished until the water level reaches the high water level electrode 82 when 80a is opened.

  In addition, an overflow pipe 83 is connected to the cistern 8 for discharging water in the cistern 8 when the water level exceeds a predetermined upper limit due to thermal expansion of water. The downstream end of the overflow pipe 83 is connected to the neutralizer 52b, and the water discharged from the overflow pipe 83 is drained from the drain pipe 52c through the neutralizer 52b.

  An inflow port 84 is provided at the upper end of the cistern 8, and the downstream end of the first connection pipe 73 is connected to the inflow port 84. In addition, a guide pipe 85 is provided in the cistern 8 so that the heat medium flowing from the first connection pipe 73 through the inlet 84 is positioned below the lower end of the low water level electrode 81. As a result, the heat medium flowing from the inlet 84 via the guide pipe 85 is guided below the lower end of the low water level electrode 81, so that the heat medium flowing from the inlet 84 does not directly contact the water level electrodes 81, 82. . Further, since the heat medium is supplied from the heat medium supply pipe 80 so that the amount of the heat medium in the cistern 8 does not become lower than the low water level electrode 81, the lower end edge of the guide pipe 85 is always below the liquid level of the heat medium. Located in. Therefore, splashing of the heat medium can be prevented, and erroneous detection of the amount of the heat medium in the cistern 8 of both the water level electrodes 81 and 82 can be prevented.

  The heat source unit 1 is provided with a controller 9. The controller 9 performs a heating operation process when the operation switch of the heating radiator 2 is turned on, and opens the on-off valve 80a when the water level in the cistern 8 is below a predetermined amount, that is, below the low water level electrode 81. When the water level reaches the high water level electrode 82, the on-off valve 80a is closed.

  In addition, the controller 9 performs a cleaning process under predetermined conditions, for example, after a predetermined number of preset heating operation processes have been performed. The cleaning process will be described in detail. First, the controller 9 opens the on-off valve 80a of the heat medium supply pipe 80 and supplies water to the cistern 8. Then, even if the water level in the cistern 8 reaches the high water level electrode 82, the supply of water is continued to make the amount of water in the cistern 8 exceed the upper limit, and the water is forcibly discharged from the overflow pipe 83. The water forcedly discharged from the overflow pipe 83 flows into the neutralizer 52b and cleans the neutralizer in the neutralizer 52b. And the water which flowed in the neutralizer 52b from the overflow pipe 83 is discharged | emitted from the drain pipe 52c with a neutralization reaction product.

  Thereby, the neutralization reaction product adhering to the surface of the neutralizing agent filled in the neutralizer 52b can be washed away, and a decrease in neutralization performance of the neutralizer 52b can be suppressed. Then, by simply connecting the overflow pipe 83 of the cistern 8 to the neutralizer 52b and adding a cleaning process to the controller 9, the neutralizer 52b can be cleaned with water. There is no need to provide piping and on-off valves. Therefore, the manufacturing cost can be kept low without increasing the size of the heat source device 1.

  In the embodiment, water is used as the heat medium. However, the heat medium is not limited to this, and other heat medium may be used as long as the neutralizer in the neutralizer 52b can be washed appropriately. .

  Further, as the heating radiator 2, for example, the heating medium circulation circuit 7 having a high-temperature side radiator such as a bathroom heater and a low-temperature side radiator such as a floor heating panel can be similarly applied. it can.

  In this case, for example, a high-temperature side radiator is provided instead of the heating radiator 2, and the low-temperature side radiator is provided with a low-temperature side outgoing pipe that guides a part of the heat medium flowing through the second connection pipe to the low-temperature side radiator. Thus, the heat medium supplied and the heat medium radiated by the low-temperature side radiator may be configured to be guided to the heating return pipe 72 via the low-temperature side return pipe.

  At this time, since the bypass path 71a guides a part of the heat medium heated by the main heat exchanger 51 to the cistern 8, the temperature of the heat medium from which the latent heat has been recovered by the auxiliary heat exchanger 52 is It will rise further by the confluence of the heat medium from 71a. Therefore, the bypass path 71a also plays a role of increasing the temperature of the heat medium supplied to the low-temperature side radiator.

Explanatory drawing which shows embodiment of the latent heat recovery type heat source machine of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Latent heat recovery type heat source machine, 2 ... Heating radiator, 4 ... Burner, 51 ... Main heat exchanger, 52 ... Sub heat exchanger, 52a ... Drain pan, 52b ... Neutralizer, 7 ... Circulating circuit for heating, 7a DESCRIPTION OF SYMBOLS ... Circulation pump, 8 ... Systurn, 80 ... Heat-medium supply pipe, 80a ... On-off valve, 83 ... Overflow pipe, 9 ... Controller.

Claims (1)

A heating circuit that is connected to a radiator and the heat medium is circulated by a circulation pump, a main heat exchanger that is interposed in the heating circuit and that heats the heat medium by combustion of the burner, and is installed in the heating circuit The secondary heat exchanger that recovers the latent heat of the combustion exhaust gas from the burner, the drain pan that is disposed below the auxiliary heat exchanger and that recovers the drain generated by the auxiliary heat exchanger, and the drain recovered by the drain pan is neutralized The upper limit of the heat exchanger in the cistern, the cistern interposed in the circulation circuit for heating, the heat medium supply pipe for supplying the heat medium to the cistern, the opening / closing valve provided in the heat medium supply pipe In the latent heat recovery type heat source machine comprising an overflow pipe that discharges the heat medium when exceeding, and a controller that opens the on-off valve of the heat medium supply pipe when the heat medium in the systern is below a predetermined amount,
The cis-turn overflow pipe is connected to the neutralizer,
The controller opens the opening / closing valve of the heat medium supply pipe, supplies the heat medium in the systern to the amount exceeding the upper limit, supplies the heat medium to the neutralizer through the overflow pipe, and cleans the neutralizer with the heat medium. A latent heat recovery type heat source machine characterized by performing a cleaning process.