JP2017207258A - Heat medium boiler system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a gradual control over a temperature increasing speed of heat medium oil without changing a control method operated by a combustion control part 71 when a heat medium boiler 2 is energized, dampen a heat shock against a circulation pump 35 and keep a long life of the circulation pump 35.SOLUTION: A heat medium boiler system 1 comprises a combustion control part 71 for controlling a combustion state of a heat medium boiler 2 on the basis of a difference between a preset target temperature and a heat medium detected temperature measured by a heat medium oil temperature detection part 36; a starting detection part 72 for detecting that the heat medium boiler 2 is started; and a starting time target temperature setting part 73 for setting a target temperature SP[t] at a time [t] [t≥t] on the basis of a detected temperature Tdetected by the heat medium oil temperature detection part 36 at the time twhen the starting of the heat medium boiler 2 is detected by the starting detection part 72 and a preset temperature increasing speed [p][temperature/time] per unit time in reference to an equation 1. SP[t]=p(t-t)+T[Equation 1]SELECTED DRAWING: Figure 1

Description

  The present invention heats the heat medium oil by combustion of the heat medium boiler, and circulates the heated heat medium oil with the heat use part as a load device by a circulation pump to heat the heat use part. The present invention relates to a heating medium boiler system to be supplied.

  There is known a heat medium boiler that can supply heat at a temperature higher than that of steam (for example, 180 degrees to 300 degrees) by using heat medium oil as a heat medium. At the time of starting the heat medium boiler, the heat medium oil is usually in a low temperature (for example, normal temperature) state. For this reason, if the heat medium boiler is burned with high combustion when the heat medium boiler is started, the temperature of the heat medium oil rises rapidly, and the thermal shock may cause distortion in the casing of the circulation pump, and may break in some cases It is known to have sex.

A heat medium boiler start-up control method is known in which the heat medium oil is heated until the temperature of the heat medium oil rises to a predetermined temperature when the heat medium boiler is started (Patent Document 1).
In Patent Document 1, when the heat medium boiler is started, the burner is operated for a set time t ₁ to heat the heat medium oil, and the temperature of the heat medium oil is increased to a certain degree to reduce its viscosity, and then circulation is performed. Start-up control of the heat medium boiler that operates the pump for a set time t ₂ , sends the heat medium oil having a low temperature to the heat medium boiler, and operates the burner for the set time t ₁ again to heat the heat medium oil. A method is described. Then, the operation of the burner according to these set time t _1, the operation of the circulation pump by setting the time t _2, until reaching the value T _A heat transfer oil temperature preset in the heating medium boiler outlet, repeatedly alternately _A heat medium boiler start-up control method is described in which after the heat medium oil temperature at the outlet of the heat medium boiler reaches a preset value TA, the start-up control is terminated and the operation control is switched to normal operation control.

Japanese Patent Laid-Open No. 07-019598

  Circulating pumps used in heat transfer boilers usually have required specifications for the temperature rise rate.When starting up the circulation pump, etc., the temperature rise rate of the heat transfer oil is adjusted according to the required specifications. Slow control is required.

  The present invention gently controls the temperature rise rate of the heat transfer oil without changing the control method by the combustion control unit when starting the heat transfer boiler, etc., relieves the thermal shock to the circulation pump, and lengthens the circulation pump. The purpose is to extend the service life.

The present invention relates to a heat medium boiler that heats the heat medium oil by burning fuel, the heat medium boiler and the heat use part, and the heat medium oil between the heat medium boiler and the heat use part. A heat medium circulation line for circulating the heat medium, a circulation pump arranged in the heat medium circulation line, a heat medium oil temperature detection unit for detecting the heat medium temperature of the heat medium oil, and a control unit for controlling the combustion of the heat medium boiler A control unit, wherein the control unit is based on a deviation between a preset target temperature and a heat medium detection temperature measured by the heat medium oil temperature detection unit. A combustion control unit that controls the combustion state of the heat medium, a start detection unit that detects that the heat medium boiler has been started, and the heat medium at time t ₀ when the start of the heat medium boiler is detected by the start detection unit detection by the oil temperature detecting portion temperature T ₀ and a preset single Based on the heating rate p (deg / hr) per hour, the heating medium boiler and a startup target temperature setting unit for the target temperature SP (t) is set by equation 1 at time t (t ≧ t ₀₎ About the system.
SP (t) = p (t−t ₀ ) + T ₀ (Formula 1)

  The startup target temperature setting unit further reaches the first target temperature T1 when the target temperature SP (t) at the time t reaches the first target temperature T1 set in advance. It is preferable to fix SP (t) at the first target temperature T1.

Wherein the control unit further includes a stop instruction detecting unit for detecting a stop instruction to the heating medium boiler, the heat transfer oil temperature detected at the time t ₀ when stop instruction is detected relative to the heating medium boiler by said stop instruction detecting section At the time of stop where the target temperature SP (t) at time t (t ≧ t ₀ ) is set by Equation 2 based on the temperature T ₀ detected by the unit and the temperature-decreasing rate p (degree / hour) per unit time set in advance And a target temperature setting unit.
SP (t) = T ₀ −p (t−t ₀ ) (Formula 2)

  When the target temperature SP (t) at the time t reaches the second target temperature T2 set in advance, the target temperature setting unit at the stop time further reaches the second target temperature T2 and the target temperature at the time after that It is preferable to fix SP (t) at the second target temperature T2.

  The control unit preferably further includes a heat medium boiler stopping unit that stops combustion of the heat medium boiler when the temperature T at the time t reaches a second target temperature T2 of a preset heat medium temperature. .

  The circulation pump is preferably installed on the outlet side of the heat medium boiler in the heat medium circulation line.

  According to the present invention, at the time of starting the heat medium boiler, etc., the temperature rise rate of the heat medium oil is gently controlled without changing the control method by the combustion control unit, the thermal shock to the circulation pump is alleviated, and the circulation pump Can extend the service life.

It is a figure which shows the outline of the heat-medium boiler system of the Example of this invention. It is a functional block diagram which shows the structure of the control part of the Example of this invention. It is a graph which shows the relationship between the combustion amount (combustion state) and heat-medium detection temperature of the Example of this invention. It is the figure which showed the heating operation of the heat-medium oil by the heat-medium boiler 2 of the Example of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the heat medium boiler system 1 includes a heat medium boiler 2, a heat medium circulation line 3, a control unit 7, and a storage unit 8.

The heat medium boiler 2 includes a can body 20, a burner 21, a blower 22 that supplies combustion air to the burner 21, a heat medium oil heating pipe 23 that is disposed inside the can body 20 and through which the heat medium oil flows, Is provided. The heat medium boiler 2 heats the heat medium oil flowing through the heat medium oil heating pipe 23 by burning the fuel with the burner 21 and heating the inside of the can body 20.
The heat medium boiler 2 in the present embodiment is a three-position combustion control boiler that can switch the combustion amount to three positions of high combustion, low combustion that burns with a combustion amount smaller than high combustion, and combustion stop. Here, high combustion is a state in which the heat output of the heat medium boiler 2 is burned at a combustion amount that is 100% of the rated output, and low combustion is, for example, 20 in which the heat output of the heat medium boiler 2 is the rated output. It refers to a state in which combustion is performed at a combustion amount of 50% to 50%. In the present embodiment, low combustion is set to a state of burning at a combustion amount that is 50% of the rated output.

  The fuel is supplied from the fuel supply line 25 to the burner 21 via the fuel adjustment valve 24. The burner 21, the blower 22, and the fuel adjustment valve 24 are electrically connected to the control unit 7 through the signal line 9.

The heat-medium circulation line 3 connects the heat-medium boiler 2 (heat-medium oil heating tube 23) and the heat use part 5, and supplies the heat-medium oil heated with the heat-medium boiler 2 to the heat use part 5 Heat medium oil return which connects supply line 31, heat use part 5, and heat-medium boiler 2 (heat-medium oil heating pipe 23), and returns heat medium oil in which heat was used in heat use part 5 to heat-medium boiler 2 And a line 32.
In the heat medium circulation line 3, a circulation pump 35 and a heat medium oil temperature detector 36 are arranged. The circulation pump 35 and the heat medium oil temperature detection unit 36 are electrically connected to the control unit 7 through the signal line 9.
In the present embodiment, the circulation pump 35 is installed in the heat medium oil supply line 31 on the outlet side of the heat medium boiler 2, but may be installed in the heat medium oil return line 32.

  By operating the circulation pump 35, the heat medium oil heated in the heat medium oil heating pipe 23 is sent to the heat using unit 5 via the heat medium oil supply line 31. The heat transfer oil deprived of heat in the heat using part 5 is returned to the heat transfer boiler 2 via the heat transfer oil return line 32. In this way, by operating the circulation pump 35, the heat medium oil that has been deprived of heat by the heat use unit 5 and has a lowered temperature is circulated to the heat medium boiler 2 through the heat medium circulation line 3.

The circulation pump 35 is usually provided with required specifications regarding the temperature increase rate and temperature decrease of the circulation pump 35 when the heat medium boiler is started. Here, the temperature rise temperature means the temperature rise of the heat transfer oil per unit time. Similarly, the temperature drop means the temperature drop of the heat transfer oil per unit time. For example, when the temperature of the heat transfer oil is increased by 150 degrees Celsius per hour, the temperature rise temperature is 150 degrees / hour. Hereinafter, “degree” means a Celsius temperature unless otherwise specified.
Note that the temperature increase rate value and the temperature decrease temperature value may be the same value or different values.

  For example, when the temperature increase temperature required for the circulation pump 35 is 150 degrees / hour, when the current temperature of the heat transfer oil is 70 degrees and the target temperature of the heat transfer oil is 220 degrees, for example, according to the temperature increase rate It is desired for the circulation pump 35 that the temperature of the heat transfer oil is gradually increased and the temperature is controlled to be 220 degrees after 1 hour.

  The heat medium oil temperature detector 36 measures the temperature of the heat medium oil. The heat medium oil temperature detector 36 is provided near the outlet of the heat medium boiler 2 (the outlet of the heat medium oil heating pipe 23). The heat medium oil temperature detection unit 36 may be provided near the outlet of the heat medium boiler 2 (the outlet of the heat medium oil heating pipe 23) and / or near the inlet of the heat medium boiler 2.

The control unit 7 starts combustion of the heat medium boiler 2 in response to the heat medium boiler operation switch (not shown) being turned on. Further, the control unit 7 stops the combustion of the heat medium boiler 2 in response to the heat medium boiler operation switch being turned off.
The controller 7 starts the operation of the circulation pump 35 provided in the heat medium circulation line 3 in response to turning on the circulation pump start switch (not shown). Further, the control unit 7 can stop the operation of the circulation pump 35 in response to turning on the circulation pump forced stop switch (not shown).

[About the control unit 7]
Next, the control unit 7 will be described in detail with reference to FIG. FIG. 2 is a functional block diagram showing the configuration of the control unit 7.
In the present embodiment, the control unit 7 has a combustion control unit 71, a startup detection unit 72, and a startup mode as a configuration for gently controlling the temperature rise rate of the heating medium oil when the heating medium boiler 2 is started. The target temperature setting part 73, the stop instruction | indication detection part 74, the target temperature setting part 75 at the time of a stop, and the heat medium boiler stop part 76 are provided.

The combustion control unit 71 controls the combustion state of the heat medium boiler 2 based on a deviation between a preset target temperature and the heat medium detection temperature measured by the heat medium oil temperature detection unit 36. As described above, the heat-medium boiler 2 is a three-position combustion control boiler that can switch the combustion amount to three positions: high combustion, low combustion that burns with a smaller combustion amount than high combustion, and combustion stop.
Therefore, specifically, the combustion control unit 71 performs high combustion, low combustion based on a deviation between a preset target temperature and the heat medium detection temperature measured by the heat medium oil temperature detection unit 36. Based on this determination, it has a function of switching the fuel adjustment valve 24 to a position of high combustion, low combustion, or combustion stop, and supplies the combustion air necessary for the combustion state from the blower 22 Let

  An example of the 3 position combustion control system by the combustion control part 71 is shown. In this method, four set values, ie, set value 1 (SP), ON / OFF control hysteresis (HYS), alarm 2 set value (A2), and alarm 2 hysteresis (HY2) are preset as parameters relating to combustion control. Is done. In this example, the set value 1 (SP) is also referred to as a target value.

FIG. 3 shows the relationship between the combustion amount (combustion state) and the heat medium detection temperature when SP = 220 degrees, HYS = 5 degrees, A2 = 10 degrees, and HY2 = 5 degrees are set in the above four parameters. . As shown in FIG. 3, when the heat medium detection temperature rises during high combustion (L1) and exceeds SP + (HYS / 2) (= 222.5 degrees), the combustion control unit 71 increases the combustion amount. Transition from the combustion position to the low combustion position. Thereafter, when the heat medium detection temperature further rises during low combustion (L2) and exceeds SP + A2 (= 230 degrees), the combustion control unit 71 shifts the combustion amount from the low combustion position to the combustion stop position (L3). Let Further, when the heat medium detection temperature falls during combustion stop (L3) and SP + A2-HY2 (= 225 degrees) is divided, the combustion amount is shifted from the combustion stop position to the low combustion position. Further, during the low combustion (L2), when the heat medium detection temperature falls and divides SP- (HYS / 2) (= 217.5 degrees), the combustion control unit 71 reduces the combustion amount from the low combustion position. Move to high combustion position.
It should be noted that, in the state of combustion at the low combustion position (L2), the heating medium detection temperature is within a temperature range that is larger than SP− (HYS / 2) (= 217.5 degrees) and smaller than SP + A2 (= 230 degrees). When the fluctuation remains, the combustion control unit 71 keeps the combustion amount at the low combustion position.
In this way, the combustion control unit 71 controls the combustion amount of the heat medium boiler 2 based on the deviation between the preset target temperature and the heat medium detection temperature measured by the heat medium oil temperature detection unit 36. be able to.
The values of the above four parameters, that is, SP, HYS, A2, and HY2 can be appropriately set by the heat medium boiler 2.

  In the present embodiment, the set value 1 (SP) is set so as to increase continuously with time by the startup target temperature setting unit 73 when the heat medium boiler 2 is started, and the set value 1 (SP). Based on the above, combustion control is performed. Details will be described later.

[Pilot combustion standby]
The burner 21 of the heat-medium boiler 2 may be a burner including an operation state of pilot combustion. In other words, the burner 21 is composed of a combination of a pilot burner and a main burner, and waits in a state in which the combustion of the pilot burner (so-called seed fire combustion state) is continued after the combustion of the main burner is stopped (“pilot combustion standby”). Or “combustion standby”).
By doing so, the combustion control unit 71 can immediately shift from the combustion standby state to the low combustion state by setting the combustion stop to the pilot combustion standby (combustion standby).

[Other combustion control methods]
Although the combustion control system of the heat medium boiler 2 is a three-position combustion control system, it is not limited to this. For example, a two-position combustion control method (switching between combustion on and off) or an n-position combustion control method (n ≧ 4) in which an intermediate combustion position is provided between a high combustion position and a low combustion position may be applied. Further, a proportional combustion control method that can continuously increase or decrease the combustion amount may be applied.

  The activation detection unit 72 detects that the heat medium boiler 2 has been activated. Here, when the heat medium boiler 2 is activated, for example, when the combustion of the heat medium boiler 2 is started in response to the heat medium boiler operation switch being turned on, for example, the heat medium boiler system 1 is In the case where a plurality of heat medium boilers 2 are provided, and the plurality of heat medium boilers 2 are combustion controlled by a number control unit (not shown), the heat medium boiler 2 is in a combustion standby state or combustion stopped by the number control unit When the combustion is started from the state, or when the heat transfer oil is supplied to the heat use part while being heated to a certain temperature (eg, 180 degrees), the heat transfer oil is raised to a higher temperature (eg, 250 degrees). This includes a case where the target temperature is reset (for example, 250 degrees) and reset so that the heat is used in the heated state.

When the activation detector 72 detects the activation of the heat medium boiler 2, the activation target temperature setting unit 73 detects the temperature detected by the heat medium oil temperature detection unit 36 at the time t ₀ when the activation of the heat medium boiler 2 is detected. The target temperature SP (t) at time t (t ≧ t ₀ ) is set according to Equation 1 based on T ₀ and a preset rate of temperature increase p (degree / time) per unit time.
SP (t) = p (t−t ₀ ) + T ₀ (Formula 1)
It should be noted that the temperature increase rate p (degree / hour) per unit time set in advance satisfies the required specifications regarding the temperature increase rate of the circulation pump 35 (that is, the temperature increase rate p (degree / hour) is at least It is preferable that the temperature is set so as to be equal to or less than a temperature increase rate that is a required specification of the circulation pump 35.
The values of the other parameters HYS, A2, and HY2 may be fixed values regardless of the SP value. Further, the values of other parameters HYS, A2, and HY2 may be set according to a preset temperature range of the SP value.

In this way, the target temperature SP (t) at the time t (t ≧ t ₀ ) is set by the startup target temperature setting unit 73, so that the heat medium temperature reaches the first target temperature T1 from T ₀ . During this time, the combustion control unit 71 determines the heat medium based on the deviation between the target temperature SP (t) at the time t and the heat medium detection temperature T (t) at the time t measured by the heat medium oil temperature detection unit 36. The combustion state of the boiler 2 can be controlled.

The startup target temperature setting unit 73 may set the target temperature SP _n at the time t ₀ + nΔt, for example, for each control cycle Δt using Equation 1A.
SP _n = p × nΔt + T ₀ (Formula 1A)
Here, 1 ≦ n ≦ (T1−T ₀ ) / p × Δt (Formula 1B)
In this way, when the heat medium detection temperature at time t ₀ + nΔt is T _n , the combustion control unit 71 detects the target temperature SP _n set for each control cycle and the heat medium oil temperature detection for each control cycle. The combustion state of the heat medium boiler 2 can be controlled based on the deviation from the heat medium detection temperature T _n measured by the unit 36.

  Accordingly, the temperature increase rate of the heat transfer oil is moderated (with respect to a preset temperature increase rate of the circulation pump 35) without changing the control method (combustion control method based on deviation from the target temperature) by the combustion control unit 71. It is possible to control the system so as to satisfy the required specifications, and it is possible to reduce the thermal shock to the circulation pump 35 and to extend the life of the circulation pump 35.

When the temperature T at the time t calculated by Equation 1 reaches the first target temperature T1 of the preset heating medium temperature, the startup target temperature setting unit 73 reaches the first target temperature T1 and thereafter. The target temperature SP (t) in time is fixed to the first target temperature T1.
When the target temperature setting unit 73 at start-up sets the target temperature SP _n at time t ₀ + nΔt according to the formula 1A for each control cycle Δt, after n exceeds (T1−T ₀ ) / p × Δt, The target temperature SP _n is fixed to the first target temperature T1.

By setting in this way, after the heat medium temperature reaches the first target temperature T1, the combustion control unit 71 keeps the heat medium detection temperature at the first target temperature T1, so that the first target temperature T1 is maintained. The combustion state of the heat medium boiler 2 is controlled based on the deviation between the heat medium detection temperature and the heat medium detection temperature.
Thereby, it becomes possible to supply the heat transfer oil that maintains the first target temperature T1 to the heat using part.

  The stop instruction detection unit 74 detects a stop instruction for the heat medium boiler 2. Here, the stop instruction to the heat medium boiler 2 is, for example, an instruction to stop the combustion of the heat medium boiler 2 in response to turning off the heat medium boiler operation switch, for example, the heat medium boiler 2 by the number control device. The target temperature is lowered (for example, when an instruction to shift the combustion state from the combustion state to the combustion stop state or the combustion standby state or when the heat transfer oil is supplied to the heat using part while being heated to a certain temperature (for example, 250 degrees)) 180 degrees) is reset, and includes instructions for resetting the heat medium oil to be supplied to the heat use unit in a state of being heated to a low temperature (for example, 180 degrees).

The target temperature setting unit 75 at the time of stop is a detected temperature T ₀ by the heat medium oil temperature detecting unit 36 at a time t ₀ when the stop instruction to the heat medium boiler 2 is detected by the stop instruction detecting unit 74 and per preset unit time. The target temperature SP (t) at time t (t ≧ t ₀ ) is set according to Equation 2 based on the temperature drop rate p (degree / hour).
SP (t) = T ₀ −p (t−t ₀ ) (Formula 2)
Note that the temperature-decreasing rate p (degrees / hour) per unit time set in advance satisfies the required specifications related to the temperature-decreasing rate of the circulation pump 35 (that is, the temperature-decreasing rate p (degrees / hour) is at least the circulation pump 35. It is preferable that the temperature is set so as to be equal to or less than the temperature lowering speed that satisfies the required specifications.
The values of the other parameters HYS, A2, and HY2 may be fixed values regardless of the SP value. Further, the values of other parameters HYS, A2, and HY2 may be set according to a preset temperature range of the SP value.

Thus, the target temperature SP (t) at time t (t ≧ t ₀ ) is set by the target temperature setting unit 75 at the time of stop, so that the combustion control unit 71 determines the target temperature SP (t) at time t as The combustion state of the heat medium boiler 2 can be controlled based on the deviation from the heat medium detection temperature T (t) at the time t measured by the heat medium oil temperature detection unit 36.

The stop target temperature setting unit 75 may set the target temperature SP _n at the time t ₀ + nΔt, for example, for each control cycle Δt using Equation 2A.
SP _n = T ₀ −p × nΔt (Formula 2A)
In this way, when the heat medium detection temperature at time t ₀ + nΔt is T _n , the combustion control unit 71 detects the target temperature SP _n set for each control cycle and the heat medium oil temperature detection for each control cycle. The combustion state of the heat medium boiler 2 can be controlled based on the deviation from the heat medium detection temperature T _n measured by the unit 36.

  Accordingly, the temperature lowering rate of the heat transfer oil is moderated (required for the temperature lowering rate of the circulation pump 35) without changing the combustion control method (combustion control method based on deviation from the target temperature) by the combustion control unit 71. And the thermal shock to the circulation pump 35 can be mitigated and the life of the circulation pump 35 can be extended.

State Incidentally, the stop instruction detection unit 74, when being supplied to the heat used portion in a state in which thermal oil is heated to a temperature T _0, which is heated thermal oil to the lower second target temperature T2 When it is detected that the target temperature has been reset to the low second target temperature T2 so that the target temperature SP (t) at the time t is When the second target temperature T2 is reached, the target temperature SP (t) at a time after reaching the second target temperature T2 is fixed to the second target temperature T2.
Note that stop target temperature setting unit 75, controlled for each cycle Delta] t, the case of setting the target temperature SP _n at time _t 0 + n.DELTA.t by formula 2A, n is _(T 0 -T2) / p × later beyond Delta] t The target temperature SP _n is fixed to the second target temperature T2.

By setting in this way, after the heat medium temperature reaches the second target temperature T2, the combustion control unit 71 keeps the heat medium detection temperature at the second target temperature T2, so that the second target temperature T2 is maintained. The combustion state of the heat medium boiler 2 is controlled based on the deviation between the heat medium detection temperature and the heat medium detection temperature.
Thereby, it becomes possible to supply the heat transfer oil that maintains the second target temperature T2 to the heat using part.

When the stop instruction detection unit 74 detects a state in which the combustion of the heat medium boiler 2 is stopped in response to the heat medium boiler operation switch being turned off, or the heat medium boiler system 1 has a plurality of heat medium boilers 2. And a plurality of heat medium boilers 2 are combusted and controlled by a number control unit (not shown), and the number control unit is on standby for combustion (or combustion stop) with respect to the heat medium boiler 2 in a combustion state. When it is detected that the instruction has been made, the heat medium boiler stop unit 76 causes the heat medium boiler 2 to burn when the temperature detected by the heat medium oil temperature detection unit 36 reaches a preset stop target temperature T3. Control to stop.
When the target temperature setting unit 75 at the time of stop sets the target temperature SP _n at time t ₀ + nΔt by the expression 2A for each control period Δt, when n exceeds (T ₀ −T3) / p × Δt Then, the operation of the heat medium boiler 2 is controlled to be stopped.

By setting in this way, it becomes possible to stop the combustion of the heat medium boiler 2 when the heat medium temperature reaches the target stop temperature T3.
As described above, the control unit 7 is configured.

The storage unit 8 includes a control program for operating the heat medium boiler system 1, preset parameters for combustion control (that is, SP, HYS, A2, HY2), and information on preset target temperatures ( For example, the first target temperature T1, the second target temperature T2, the third target temperature T3, etc.), information set by the start-time target temperature setting unit 73 and the stop-time target temperature setting unit 75 (for example, Formula 1, Formula 2, etc.) ) Is stored.
In addition, when the target temperature setting unit 73 at start and / or the target temperature setting unit 75 at stop sets the target temperature SP _n at time t ₀ + nΔt for each control cycle Δt using the formula 1A or the formula 2A, the storage unit 8 , the target temperature SP _n are stored.

[Description of operation]
Next, with reference to FIG. 4, the heating operation of the heat medium oil by heating the heat medium boiler 2 of this embodiment will be described. FIG. 4 is a diagram illustrating an example of the heating operation of the heat medium oil by the heat medium boiler 2 of the present embodiment. The horizontal axis represents time t (unit: time), and the vertical axis (left side) represents the heating medium temperature T (unit: degree).

In FIG. 4, the rate of temperature rise p (degrees / hour) is 150 degrees / hour, the first target temperature SP is 220 degrees, and the current heating medium temperature is 70 degrees.
When the combustion of the heat medium boiler 2 is started in response to the heat medium boiler operation switch being turned on at time t ₀ , the startup target temperature setting unit 73 sets the target temperature at time t (t ≧ t ₀ ). SP (t) is set according to Equation 3.
SP (t) = (1/150) (t−t ₀ ) +70 (Formula 3)
At time t, the combustion control unit 71 controls the combustion state of the heat medium boiler 2 based on the deviation between the target temperature SP (t) and the heat medium detection temperature measured by the heat medium oil temperature detection unit 36. .
As a result, as shown in FIG. 3, the heating medium detection temperature is changed to the current temperature (70 degrees C.) while switching the combustion control as shown in FIG. 3 in accordance with the change of the target temperature SP (t). ) To a temperature increase rate of 1/150 (degrees / hour).

As described above, the heat medium boiler system 1 of the present embodiment is based on the deviation between the target temperature set in advance and the heat medium detection temperature measured by the heat medium oil temperature detection unit 36. A combustion control unit 71 that controls the combustion state, a start detection unit 72 that detects that the heat medium boiler 2 has been started, and a heat medium at time t ₀ when the start of the heat medium boiler 2 is detected by the start detection unit 72 The target temperature SP (t) at time t (t ≧ t ₀ ) is expressed by Equation 1 based on the temperature T ₀ detected by the oil temperature detection unit 36 and a preset temperature increase rate p (degrees / hour) per unit time. A startup target temperature setting unit 73 set by
Thus, the heat medium boiler system 1 of the present embodiment gently controls the temperature rise rate of the heat medium oil without changing the combustion control based on the deviation from the target temperature by the combustion control unit 71, and It is possible to alleviate the thermal shock and extend the life of the circulation pump 35. In addition, it is possible to control the circulating pump 35 so as to satisfy the required specifications relating to the rate of temperature increase.

In addition, when the target temperature SP (t) at the time t reaches the preset first target temperature T1, the startup target temperature setting unit 73 of the heat medium boiler system 1 according to the present embodiment reaches the first target temperature T1. The target temperature SP (t) in the time after reaching the value is fixed to the first target temperature T1.
Thereby, after reaching the 1st target temperature T1, the heat carrier boiler system 1 of this embodiment can supply the heat medium oil which maintains the 1st target temperature T1 to the heat use part. .

The control unit 7 of the heat medium boiler system 1 of the present embodiment further includes a stop instruction detection unit 74 that detects a stop instruction for the heat medium boiler 2 and a stop instruction for the heat medium boiler 2 by the stop instruction detection unit 74. The target at time t (t ≧ t ₀ ) based on the detected temperature T ₀ by the heat medium oil temperature detecting unit 36 at the detected time t ₀ and the temperature-decreasing rate p (degree / hour) per unit time set in advance. And a stop target temperature setting unit 75 that sets the temperature SP (t) according to Equation 2.
Thereby, since the heat-medium boiler system 1 of this embodiment can moderately control the temperature fall rate of heat-medium oil, the thermal shock with respect to the circulation pump 35 can be relieve | moderated and the circulation pump 35 can be extended in life. In addition, it is possible to perform control so as to satisfy the required specifications related to the temperature lowering rate of the circulation pump 35.

Further, when the target temperature SP (t) at the time t reaches the preset second target temperature T2, the stop target temperature setting unit 75 of the heat medium boiler system 1 of the present embodiment further reaches the second target temperature T2. The target temperature SP (t) at a time after reaching the temperature T2 is fixed to the second target temperature T2.
Thereby, after reaching 2nd target temperature T2, it becomes possible to supply the heat transfer oil which maintains 2nd target temperature T2 with respect to a heat use part.

Moreover, the control part 7 of the heat-medium boiler system 1 of this embodiment will also stop combustion of a heat-medium boiler, if the detection temperature by the heat-medium oil temperature detection part 36 reaches | attains the preset stop target temperature T3. A heating medium boiler stop unit 66 is provided.
Thereby, the heat-medium boiler system 1 can make it possible to stop the operation of the heat-medium boiler 2 after gradually lowering the heat-medium temperature at the time of stop.

The circulation pump 35 is installed on the outlet side of the heat medium boiler 2 in the heat medium circulation line 3.
Thereby, the temperature of the heat transfer oil flowing through the circulation pump 35 and the temperature of the heat transfer oil supplied to the heat using part can be controlled to be equal.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

[Modification 1]
Although the three-position combustion control method is applied to the combustion control unit of the present embodiment, it is not limited to the three-position combustion control method. The combustion control unit may apply a two-position combustion control method, an n-position combustion control method (n ≧ 4), or a proportional combustion control method instead of the three-position combustion control method.

[Modification 2]
In the present embodiment, the circulation pump is installed downstream of the heat medium boiler, but the circulation pump may be installed upstream of the heat medium boiler. Moreover, you may make it install a circulation pump in the upstream and downstream of a heat-medium boiler.

DESCRIPTION OF SYMBOLS 1 Heat medium boiler system 2 Heat medium boiler 21 Burner 22 Blower 23 Heat medium oil heating pipe 24 Fuel adjustment valve 25 Fuel supply line 3 Heat medium circulation line 31 Heat medium oil supply line 32 Heat medium oil return line 35 Circulation pump 36 Heat medium Oil temperature detection unit 5 Heat use unit 7 Control unit 71 Combustion control unit 72 Start detection unit 73 Start target temperature setting unit 74 Stop instruction detection unit 75 Stop target temperature setting unit 76 Heat medium boiler stop unit 8 Storage unit 9 Signal line

Claims (6)

A heating medium boiler that heats the heating medium oil by burning fuel,
A heating medium circulation line that connects the heating medium boiler and the heat use section, circulates heat medium oil between the heating medium boiler and the heat use section, and a circulation pump disposed in the heating medium circulation line;
A heat medium oil temperature detector for detecting the heat medium temperature of the heat medium oil;
A control unit for controlling the combustion of the heat medium boiler;
A heating medium boiler system comprising:
The controller is
A combustion control unit that controls a combustion state of the heating medium boiler based on a deviation between a preset target temperature and the heating medium detection temperature measured by the heating medium oil temperature detection unit;
An activation detector for detecting that the heat medium boiler has been activated;
At the time t ₀ when the activation detection unit detects activation of the heat medium boiler, the temperature T ₀ detected by the heat medium oil temperature detection unit and a preset temperature increase rate p (degrees / hour) per unit time Based on the target temperature setting unit at start-up, the target temperature SP (t) at time t (t ≧ t ₀ ) is set according to Equation 1,
Heat medium boiler system equipped with.
SP (t) = p (t−t ₀ ) + T ₀ (Formula 1) The startup target temperature setting unit further includes:
When the target temperature SP (t) at the time t reaches the first target temperature T1 set in advance, the target temperature SP (t) at the time after reaching the first target temperature T1 is changed to the first target temperature T1. The heat-medium boiler system of Claim 1 fixed to. The control unit further includes:
A stop instruction detector for detecting a stop instruction for the heat medium boiler;
The temperature T ₀ detected by the heat medium oil temperature detection unit at a time point t ₀ when the stop instruction to the heat medium boiler is detected by the stop instruction detection unit, and a preset temperature decrease rate p (degree / hour) per unit time And a target temperature setting unit at a stop time for setting the target temperature SP (t) at time t (t ≧ t ₀ ) according to Equation 2,
The heat-medium boiler system of Claim 1 or Claim 2 provided with these.
SP (t) = T ₀ −p (t−t ₀ ) (Formula 2) The stop target temperature setting unit further includes:
When the target temperature SP (t) at the time t reaches the preset second target temperature T2, the target temperature SP (t) at the time after reaching the second target temperature T2 is changed to the second target temperature T2. The heat-medium boiler system of Claim 3 fixed to. The control unit further includes:
The heat-medium boiler according to claim 3, further comprising a heat-medium boiler stop unit that stops combustion of the heat-medium boiler when a temperature detected by the heat-medium oil temperature detection unit reaches a preset stop target temperature T3. system.   The heat medium boiler system according to any one of claims 1 to 5, wherein the circulation pump is installed on an outlet side of the heat medium boiler in the heat medium circulation line.

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