JP2022107870A - Boiler device - Google Patents

Abstract

To provide a boiler device that eliminates the need to provide a control device for controlling a plurality of boilers, separately from the boilers, and eliminates the need for an expensive flow rate sensor for temperature control of hot water.SOLUTION: One of a plurality of boilers A is made to function as a master boiler A1, and the others are made to function as slave boilers A2-A4. The master boiler A1 controls operation of the slave boilers A2-A4. Each of the boilers A1-A4 has a hot water outflow temperature control function of controlling the flow rate of a boiler water circulation pump 5 to make an adjustment so that a hot water outflow temperature becomes equal to a set temperature, and a boiler water temperature control function of controlling the thermal power of a burner 8 to make an adjustment so that a boiler water temperature becomes higher than the set temperature by a predetermined temperature.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to a technique for controlling outlet heated water temperature to a set temperature by a plurality of boilers.

BACKGROUND ART Conventionally, a technique of heating and controlling hot water to a set temperature using a plurality of boilers is known. By using multiple boilers, it is possible to reduce the capacity of each boiler. It has the advantage of preventing a decrease in efficiency when the amount of hot water is increased.

As a technique for controlling a plurality of boilers, the automatic number control method described in Patent Document 1 below can be exemplified. The control method will be briefly described below.

JP-A-3-11261

As shown in FIG. 4, a plurality of hot water boilers 101 described in Patent Document 1 are installed in parallel. A flow sensor 108 is attached to the hot water supply system, which is connected by a path 104 .

The load such as the hot water supply equipment includes a heat exchanger 105 that transfers the heat of hot water flowing from the plurality of boilers 101 through the hot water supply line 103 and the return line 104 to the load 102 such as the hot water supply system, and the hot water supply from the plurality of boilers 101. A circuit 103, an upper header 111 as a hot water supply side collecting portion, a heat exchanger 105, a lower header 112 as a hot water return side collecting portion, and a circulation pump that circulates hot water again to the boiler 101 via a return line 104. 106 are provided.

Further, the upper header 111 and the lower header 112 of the load 102 are provided with a temperature sensor 107 for detecting the temperature of the hot water gathered here and a temperature sensor 110 for detecting the temperature of the circulating water (outflow water) of the load 102. there is

Reference numeral 109 denotes an automatic number controller for controlling the number of hot water boilers 101 .

The heat source hot water heated to a predetermined temperature by the plurality of hot water boilers 101 is circulated through the hot water supply system 103, the heat exchanger 105, and the return system 104 by the operation of the circulation pump 106. , heat exchangers 105 provided individually for the loads 102, and heat is supplied to the respective loads.

A temperature sensor 107 detects the temperature of hot water gathered in the upper header 111 and the lower header 112, and controls the number of hot water boilers 101 in operation by an automatic number controller 109 according to the temperature difference between the two.

When controlling the number of hot water boilers 101, the order of priority of start/stop is determined in advance, and the start/stop is performed according to the order. In addition, in order to average the operation rate of each hot water boiler 101, rotation of priorities is performed as appropriate.

In addition, the flow rate sensor 108 detects the circulation amount of the heat source hot water, and the necessary heat amount is calculated from the temperature difference between this circulation amount and the hot water temperature of the upper header 111 and the hot water temperature of the lower header 112. The number of operating boilers 101 is controlled.

When changing the circulation amount of the heat source hot water, the temperature sensor 110 detects the temperature of the hot water to control the operation of the circulation pump 106 . If the load decreases and the required amount of heat decreases, the number of operating hot water boilers 101 is reduced, and if the load increases and the required amount of heat increases, the number of operating hot water boilers 101 is controlled to increase.

As described above, the hot water boiler has a function of controlling the number of hot water boilers 101 to be operated according to the magnitude of the temperature difference detected by the two temperature sensors provided in the circulation path of the heat source hot water, A function to calculate the necessary amount of heat according to the detection results of the flow rate sensor 108 and two temperature sensors provided in the circulation path of , and to control the number of hot water boilers 101 to be operated according to the calculated value, and the temperature sensor to measure the outlet water temperature. 110 detects and controls the operation of the circulation pump 106 to vary the circulation amount of the heat source hot water. done.

Therefore, an automatic number controller 109 is required separately from the plurality of boilers 101 . Further, the flow rate sensor 108 is required for calculating the required heat amount. The cost is high because flow sensors are relatively expensive.

In addition, since the automatic number controller 109 is required, the system configuration is complicated.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a boiler apparatus that does not include an automatic unit controller and a flow rate sensor that are installed separately from a hot water boiler.

According to the first aspect of the invention, the boiler water is circulated among a can body that stores boiler water, a burner that heats the boiler water, and a heating medium flow pipe that is connected to the boiler body and the outside of the boiler body. A pump, a boiler water temperature sensor for measuring the temperature of the boiler water flowing through the heat medium flow pipe, a heat exchanger attached in the middle of the heat medium flow pipe, and connected via the heat exchanger. Measured temperature information is detected from a water inlet pipe and a hot water outlet pipe, a hot water outlet pipe temperature measuring temperature sensor for measuring the water temperature in the hot water outlet pipe, and the boiler water temperature measurement temperature sensor and the hot water outlet pipe temperature measurement temperature sensor. and a plurality of boilers comprising a controller for controlling a thermal power command to the burner and driving/stopping of the pump, wherein the temperature of the hot water flowing through the hot water discharge pipe is controlled by the plurality of boilers, and the plurality of boilers one of the boilers functions as a master boiler, the other boilers function as slave boilers, and the master boiler controls itself and the slave boilers so that the temperature of the hot water flowing through the hot water discharge pipe reaches a set temperature. This control is to use boiler water temperature control that controls the flow rate of the boiler water circulation pump and boiler water temperature control that controls the thermal power of the burner and adjusts the boiler water temperature so that it is a certain temperature higher than the set temperature. It has characteristics.

The invention according to claim 2 is characterized in that the outlet heated water temperature control according to claim 1 is PI control.

The invention according to claim 3 is characterized in that the boiler water temperature control according to either claim 1 or claim 2 is PI control.

According to the invention of claim 1, there is no need to provide a host system control device for controlling the boiler in addition to the boiler, and the device configuration can be simplified. Moreover, since an expensive flow rate sensor is not required, the product cost can be reduced.

According to the second aspect of the invention, the outlet hot water temperature can be adjusted to the set temperature by controlling the flow rate and the thermal power of the burner.

1 is a configuration diagram of a master boiler or each slave boiler that constitutes the boiler apparatus of the present invention; FIG. 3 is an electrical system configuration diagram of the master boiler or each slave boiler. FIG. 3 is a connection configuration diagram of the master boiler or each slave boiler; FIG. 1 is a configuration diagram of a conventional hot water boiler; FIG.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. FIG. 1 shows the configuration of each boiler (master boiler or slave boiler) A that constitutes the boiler apparatus of the present invention.

In FIG. 1, 1 is a water storage can that stores water (boiler water) to be used as a heat medium, and 2 is a supply pipe that replenishes the water storage can 1 with the water. Reference numeral 3 is a replenishment solenoid valve provided in the replenishment pipe 2 for switching between water supply and water stoppage. be.

Reference numeral 4 denotes a heat medium circulation pipe that communicates with the inside of the water storage can 1 and circulates the boiler water in the water storage can 1 outside the water storage can 1; This is a circulation pump for circulating the

Reference numeral 6 denotes a temperature sensor for measuring boiler water temperature attached to the heat medium circulation pipe 4 , and 7 denotes a heat exchanger provided on the heat medium circulation pipe 4 .

8 is a burner for heating the boiler water in the water storage can 1 from the outside of the water storage can 1, and 9 is a fuel supply pipe for supplying fuel to the burner 8. As shown in FIG. Denoted at 10 is a fuel control solenoid valve attached to the fuel supply pipe 9 for switching between supply and stop of fuel supply to the burner 8 .

Reference numeral 11 denotes an air supply pipe for supplying the burner 8 with air required for combustion, and 12 denotes an air supply solenoid valve for switching between supplying air to the burner 8 and stopping it.

Reference numeral 13 denotes a water inlet pipe in which the heat exchanger 7 is arranged in the middle, and 14 indicates a hot water outlet pipe connected to the water inlet pipe 13 via the heat exchanger 7 . A temperature sensor 15 is attached to the outlet hot water pipe 14 and measures the outlet hot water temperature.

Numeral 16 detects the water level in the water storage can 1 and the solenoid valves 3, 10, and 12 constituting the boiler A based on command signals from an operation panel, which will be described later, and temperature information from temperature sensors 6 and 15. A controller for controlling various control devices constituting the boiler A, such as a water level sensor, a burner 8, and a circulation pump 5, is shown.

A remote controller 17 outputs a command signal to the controller 16, and is operated for the purpose of controlling various control devices constituting the boiler A, like the operation panel.

FIG. 2 is an electrical system diagram for explaining the electrical connections between the controller 16 shown in FIG. 1 and its peripheral devices. As shown in FIG. 2, the controller 16 includes a control power supply unit 19 connected to an external power supply 18, a control unit 20 operated by receiving control power supply from the control power supply unit 19, and a command to the control unit 20. It is roughly composed of an operation panel 21 for outputting signals.

The operation panel 21 includes an operation unit for inputting instruction information to be output to the control unit 20 by the operator, various display units, a setting unit, and the like.

The control unit 20 receives control instructions from a remote controller 17 in addition to the operation panel 21 . An external power supply 22 is separately supplied to the remote controller 17 . The functions of the remote controller 17 are substantially the same as those of the operation panel 21 described above, but the remote controller 17 has a plurality of boilers (only two are shown in FIG. 2) as shown in FIG. Since A is connected, switches and the like that enable operation of a plurality of boilers A with one remote controller are separately provided.

When a command signal, various setting signals, or various sensor information such as the temperature sensors 6 and 15 connected to the sensor contacts 23 are input to the control unit 20 from the operation panel 21 or the remote controller 17, the control unit 20 receives the input. Various settings are executed based on the setting information received, and the control equipment 24 and other boilers A are controlled according to the input command signal. The control device 24 includes the solenoid valves 3, 10, 12 shown in FIG. 1, a water level sensor (not shown) for detecting the water level in the water storage can 1, the burner 8, the circulation pump 5, and the like.

Next, FIG. 3 shows the physical connection state of each boiler (master boiler, slave boiler) A according to the boiler apparatus of the present invention. As shown in FIG. 3, in the boiler apparatus of the present invention, a plurality of boilers A (four in FIG. 3) having the configuration shown in FIG. 1 are connected in series.

That is, as shown in FIG. 3, a boiler apparatus A having the same configuration as the boiler A shown in FIG. A boiler apparatus A having the same configuration, in which the water inlet pipe 13 is connected to the hot water outlet pipe 14 of A, is further connected.

By connecting a plurality of boilers A in series in this manner, the temperature of discharged hot water is controlled by the plurality of boilers A so as to be the set temperature. Further, in the present invention, one of the plurality of boilers A functions as a master boiler and the others function as slave boilers. The master boiler controls start/stop of the slave boilers.

Various methods can be used to determine which boiler should be the master boiler or the slave boiler. For example, the boiler that is turned on first may function as the master boiler. When one boiler is set as the master boiler in this manner, the other boilers are automatically set and function as slave boilers.

Next, the operation of the boiler apparatus of the present invention will be explained. First, each boiler A shown in FIG. 3 stores a certain amount of boiled water in the water storage can 1 when the power is turned on in preparation for hot water supply demand. At this time, as described above, for example, the boiler A whose power is turned on first functions as the master boiler A1, and the others function as the slave boilers A2 to A4.

The water level in the water storage can 1 of each boiler A1 to A4 is monitored by a water level sensor (not shown), and the replenishment electromagnetic valve 3 is automatically switched between opening and closing. When the water level of boiler water becomes higher than the reference water level, the replenishing solenoid valve 3 is closed to stop the water, and when the level becomes lower, the replenishing solenoid valve 3 is opened to supply water into the water storage can 1. (water supply function). The water supply function may include a function to determine that the water supply valve is abnormal when the low water level is continuously detected for a certain period of time or longer.

Further, the boiler water in the water storage can 1 of each of the boilers A1 to A4 is preheated to a predetermined temperature in preparation for hot water supply demand. Specifically, by opening the fuel control solenoid valve 10 , fuel is sent to the burner 8 through the fuel supply pipe 9 , and by opening the air supply solenoid valve 12 , combustion air is sent to the burner 8 .

Thereafter, by controlling the ignition of the burner 8, the boiler water in the water storage can 1 is heated to a predetermined temperature by combustion of the burner 8. - 特許庁Whether or not the temperature of the boiler water reaches a predetermined temperature is determined by driving the circulation pump 5 to circulate the boiler water through the heat medium circulation pipes 4, and the temperature of the circulating boiler water is sent to the heat medium circulation pipes 4. Detected by the installed boiler water temperature measuring temperature sensor 6 and transmitted to the control unit 20 of the controller 16, the control unit 20 grasps the detected result.

The above preparations are performed before the demand for hot water supply occurs, and when the demand for hot water supply arises, first, the outlet hot water temperature is heated to the set temperature by the single master boiler A1. There are two functions for controlling the outlet hot water temperature: outlet hot water temperature control function and boiler water temperature control function.

The outlet hot water temperature control function controls the flow rate of the circulation pump 5 and adjusts the outlet hot water temperature to the set temperature. As for the hot water temperature, measured temperature information detected by the temperature sensor 15 for measuring hot water pipe temperature is output to the control section 20 of the controller 16 . Upon receiving the information, the control unit 20 further controls the flow rate of the circulation pump 5 so that the outlet hot water temperature approaches the set temperature. By repeating the above operations, the outlet heated water temperature is adjusted to the set temperature.

The control method varies depending on the configuration of the control equipment. For example, when an inverter for driving the circulation pump 5 is provided, PI control is performed with the input signal as temperature information measured by the hot water outlet pipe temperature measurement temperature sensor 15 and the output signal as the inverter frequency setting signal.

If such an inverter is not provided, the input signal is the temperature information measured by the temperature sensor 15 for measuring the hot water pipe temperature, and the output signal is the ON/OFF signal of the switch (not shown) of the circulation pump 5.

The boiler water temperature control function controls the heating power of the burner 8 and adjusts the temperature of the boiler water circulating in the heat medium flow pipe 4 to a certain temperature higher than the set temperature. The boiler water temperature sensor 6 for measuring the boiler water temperature detects the temperature of the boiler water circulating in the heat medium flow pipe 4 and outputs the measured temperature information to the control unit 20 of the controller 16 . Upon receiving the information, the control unit 20 further controls the heating power of the burner 8 so that the outlet hot water temperature approaches the set temperature. By repeating the above operations, the boiler water temperature is adjusted to the set temperature.

The control method varies depending on the fuel. For example, in the case of gas firing, the input signal is the measured temperature information of the boiler water temperature sensor 6, and the output signal is the opening degree setting (close to full open) signal of the fuel control solenoid valve 10. and PI control.

In the case of oil firing, the input signal is the temperature information measured by the temperature sensor 15 for measuring the hot water pipe temperature, and the output signal is the ON/OFF signal of the fuel control solenoid valve 10 (for example, the 3-position ON/OFF signal). do.

At this time, the fuel control solenoid valve 10 and the air supply solenoid valve 12 are interlocked to keep the air-fuel ratio constant.

Next, an example of the operation when the demand for hot water supply increases while the above operations are being performed will be described. When the demand for hot water supply increases, the boiler apparatus of the present invention first heats the output hot water temperature to a set temperature that meets the demand for hot water supply by the master boiler A1 alone.

When the master boiler A1 alone can heat the tapping temperature to the set temperature, the slave boilers A2 to A4 do not operate. However, if the outlet hot water temperature is still less than the set temperature even after the thermal power command for the master boiler A1 reaches the upper limit, the slave boilers A2 to A4 that have been stopped are simultaneously operated in the present invention as shown in FIG. By operating the heater, the outlet hot water temperature is heated up to the set temperature at once.

After the outlet heated water temperature reaches the set temperature, the number of operating slave boilers A2 to A4 is controlled to reduce the number of operated slave boilers A2 to A4 so that the outlet heated water temperature is maintained at the set temperature. .

At this time, the outlet heated water temperature control of each of the boilers A1 to A4 is executed by the outlet heated water temperature control function and boiler water temperature control function described above. Unlike the conventional technology, outlet hot water temperature control using this function does not require a flow rate sensor and can increase the outlet hot water temperature to a set temperature in response to an increase in hot water supply demand, thereby reducing equipment costs. can.

In addition, the present invention is compared with a method in which after the thermal power command of the master boiler A1 reaches the upper limit, the slave boilers A2 to A4 are sequentially started to increase the number of boilers (heat source devices) in operation. As a result, the outlet heated water temperature can be heated to the set temperature in an extremely short time.

By executing the above outlet hot water temperature control, the incoming water in the water inlet pipe 13 shown in FIG. The discharged hot water heated to the set temperature in this manner meets the hot water supply demand of the user.

As described above, according to the boiler apparatus of the present invention, even when the demand for hot water supply increases, the flow rate of the boiler water circulation pump is controlled based on the temperature information measured by the hot water outlet pipe temperature sensor. There is no need for an expensive flow sensor.

In addition, since one of the plurality of boilers functions as a master boiler, the other slave boilers can be controlled by the master boiler, so there is no need to separately provide a control device for controlling the plurality of boilers. Configuration can be simplified.

In the above description, the number of slave boilers is three, but the scope of the present invention is not limited to this number.

It is applicable to a boiler system composed of a plurality of boilers.

REFERENCE SIGNS LIST 1 water storage can 2 supply pipe 3 supply solenoid valve 4 heat medium flow pipe 5 circulation pump 6 temperature sensor for pipe water temperature measurement 7 heat exchanger 8 burner 9 fuel supply pipe 10 fuel control solenoid valve 11 air supply pipe 12 air supply 13 Water inlet pipe 14 Hot water outlet pipe 15 Temperature sensor for hot water outlet pipe temperature measurement 16 Controller 17 Remote controller 18, 22 External power supply 19 Control power supply unit 20 Control unit 21 Operation panel 23 Sensor contact 24 Control device A Boiler (master boiler A1, Slave boiler A2-A4)

Claims (3)

a can body for storing boiler water, a burner for heating the boiler water, a pump for circulating the boiler water between the can body and a heat medium flow pipe connected to the outside of the boiler body, and a heat medium flow pipe. a boiler water temperature sensor for measuring the temperature of boiler water flowing through, a heat exchanger attached in the middle of the heat medium flow pipe, a water inlet pipe and a hot water outlet pipe connected via the heat exchanger, and the A hot water outlet pipe temperature measuring temperature sensor for measuring the water temperature in the hot water outlet pipe, and the measured temperature information from the boiler water temperature measuring temperature sensor and the hot water outlet pipe temperature measuring temperature sensor are detected to issue a thermal power command to the burner and The plurality of boilers are provided with a controller that controls driving/stopping of the pump, and the temperature of the hot water flowing through the hot water discharge pipe is controlled by the plurality of boilers, and one of the plurality of boilers functions as a master boiler. The other boilers function as slave boilers, and the master boiler controls itself and the slave boilers so that the temperature of the hot water flowing through the hot water discharge pipe reaches the set temperature. A boiler device characterized by using both outlet hot water temperature control for controlling the flow rate of a circulating pump and boiler water temperature control for controlling the heating power of a burner and adjusting the boiler water temperature to be higher than a set temperature by a certain temperature. 2. The boiler apparatus according to claim 1, wherein the outlet heated water temperature control is PI control when an inverter for driving a circulation pump is provided as a component. The boiler water temperature control is PI control when the supplied fuel is gas-fired, and three-position ON/OFF control of high output, low output, and OFF when the supplied fuel is oil-fired. 3. The boiler apparatus according to any one of 2.

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