JPH0719598A - Starting control method for heating medium boiler - Google Patents

Abstract

PURPOSE:To obtain a starting control method with safety and a good efficiency by automating a heating operation of a heating medium at a starting, through alternate repetitions of a burner operation and a circulating pump operation according to a set time, until the heating medium temperature at a boiler outlet section reaches a preliminarily set temperature. CONSTITUTION:A starting method of a heating medium boiler includes a heating of a heating medium by an operation of a boiler during a set time t1 through an usage of a timer, an operating of a circulating pump during a set time t2 after a decrease of viscosity through arising a temperature of the medium, a sending of the heating medium with a low temperature to the heating medium boiler an operating again of the burner during a set time t1 and a heating of the heating medium. And, alternate repetitions of a burner operation and a circulating pump operation according to a set time are executed until the heating medium temperature at a boiler outlet section reaches a preliminarily set temperature Ta. After the heating medium temperature at the boiler outlet section reaches the preliminarily set temperature Ta, a changing-over to an usual control of an operation is executed after finishing the starting control.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a start control method for a heat medium boiler.

[0002]

2. Description of the Related Art As is well known, when a heat medium boiler is started, the heat medium is in a low temperature state (almost room temperature). Therefore,
When the heat medium boiler starts up, the viscosity of the heat medium is high, and if the circulation pump is operated as it is, overcurrent due to overload will occur and the thermal of the electric switch connected to the circulation pump will be in a trip state, The pump stops. Therefore, when the heat medium boiler is started, the person in charge of the boiler
The heating operation of the heating medium is carried out until the temperature of the heating medium rises to a predetermined value. That is, the manual valve provided in the heat medium circulation line is operated to reduce the circulation amount of the heat medium, and the combustion switch is turned on.
-The switch is turned off and the burner is operated intermittently to heat the heat medium.

[0003]

However, the above-mentioned heating operation of the heating medium must be manually performed while constantly checking the temperature of the heating medium and the like, which is a very complicated work. In addition, this heating operation of the heating medium requires a certain amount of experience and skill, so if an inexperienced boiler staff member performs this work, it will take a considerably long time, and the heating medium will not be partially removed. There is also a risk of overheating.

[0004]

The present invention has been made in view of the above-mentioned problems, and automates the heating operation of the heating medium at the time of starting the heating medium boiler, and provides safe and efficient starting control. The purpose is to provide a method. That is, the present invention provides a heat medium circulation line in which a circulation pump is inserted, and a burner for heating the heat medium in the heat medium circulation line,
In a heat medium boiler equipped with a blower that supplies combustion air to this burner, at the time of starting the heat medium boiler, after operating the burner for a set time t ₁ , set the circulation pump for the set time.
t ₂ only is operated, the operation of the burner according to these set time t _1, repeating the operation of the circulating pump according to the set time t _2, alternately until a value T _A heat medium temperature is preset at the boiler outlet It is characterized by that. Further, the present invention operates at the time of starting the heat medium boiler with the circulation amount of the heat medium being smaller than during normal operation, and after operating the burner for a set time t ₁ , stops it for the set time t _2. ,
The operation of the burner at the set time t ₁ and the stop of the burner at the set time t ₂ are alternately repeated until the heat medium temperature at the boiler outlet reaches a preset value T _A. Further, according to the present invention, when the heating medium boiler is started, the circulating amount of the heating medium is made smaller than in the normal operation, the burner is operated, and the heating medium temperature at the boiler outlet part is set to a preset value T _A. When the heat medium temperature at the boiler outlet portion reaches the preset value T _B , the burner is operated when the heat medium temperature at the boiler outlet portion drops to a preset value T _B. Even if the set time t ₃ elapses after reaching T _A , the heat medium temperature at the boiler outlet is set to the preset value T 3.
_The feature is that it repeats alternately until it does not drop to _B.

[0005]

According to the present invention, when the heat medium boiler is started, the burner is operated for the set time t ₁ and then the circulation pump is operated for the set time t _2, and the burner is operated and set by the set time t _1. The operation of the circulation pump at time t ₂ is alternately repeated until the heat medium temperature at the boiler outlet reaches a preset value T _A. Further, the present invention operates at the time of starting the heat medium boiler with the circulation amount of the heat medium being smaller than during normal operation, and after operating the burner for a set time t ₁ , stops it for the set time t _2. The operation of the burner at the set time t ₁ and the stop of the burner at the set time t ₂ are alternately repeated until the heat medium temperature at the boiler outlet reaches a preset value T _A. Further, according to the present invention, when the heating medium boiler is started, the circulating amount of the heating medium is smaller than that in the normal operation, the burner is operated, and the heating medium temperature at the boiler outlet is set to a preset value T _A. When it reaches, the burner is stopped, and when the heat medium temperature at the boiler outlet falls to a preset value T _{B, the} burner is operated,
After the heat medium temperature at the boiler outlet reaches the preset value T _A for the operation and stop of the burner, even if the set time t _{3 has} elapsed, the heat medium temperature at the boiler outlet has the preset value T _B. It repeats alternately until it does not decrease.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a heat medium boiler system to which the present invention is applied. A heat medium circulation line (3) is attached to the heat medium boiler (1). Further, the heat medium boiler (1) includes a burner (4) for heating the heat medium in the heat medium circulation line (3) and a blower (5) for supplying combustion air to the burner. The heat medium circulation line (3) is
A circulation pump (2) for circulating the heat medium is provided between the heat medium boiler (1) and a load (not shown) to circulate the heat medium, and in the heat medium circulation line (3). Has been inserted.
During normal operation, the circulation amount of the heat medium by the circulation pump (2) is set to be almost constant. In the heat medium circulation line (3), a first temperature sensor (6) for detecting the heat medium temperature at the boiler inlet part at the boiler inlet part, and a second temperature sensor for detecting the heat medium temperature at the boiler outlet part at the boiler outlet part. A temperature sensor (7) is provided for each. The burner (4) operates based on the heat medium temperature detection signal from the second temperature sensor (7).
The heating of the burner (4) maintains the temperature of the heating medium at a predetermined value. (8) shows an expansion tank unit, (9) shows a storage tank unit, and (10) shows a filling pump unit.

The heat medium circulation line (3) is provided with a differential pressure detector (11) for detecting the difference between the pressure of the heat medium at the boiler inlet and the pressure of the heat medium at the boiler outlet. When the difference between the pressure of the heating medium at the boiler inlet and the pressure of the heating medium at the boiler outlet due to this differential pressure detector (11) is larger than a preset value, that is, the circulation pump (2) operates normally. When it operates and there is a circulation flow rate above a predetermined value, it is possible to shift to combustion.
Further, a motor-operated valve (12) is inserted in the heat medium circulation line (3), and the circulation amount of the heat medium can be adjusted by controlling the opening thereof.

2 to 4 show the start-up control according to the present invention by comparing the operating states of the burner and the circulation pump with changes in the heating medium temperature.

In the embodiment shown in FIG. 2, a timer is used to operate the burner (4) for a set time t ₁ to heat the heat medium, and to raise the temperature of the heat medium to a certain extent to reduce its viscosity. After that, the circulation pump (2) is operated for the set time t ₂ , the heat medium with low temperature is sent to the heat medium boiler, and the burner (4) is operated again for the set time t _{1 to} operate the heat medium. To heat. Then, the operation of the burner (4) at the set time t ₁ and the operation of the circulation pump (2) at the set time t ₂ are performed until the heat medium temperature at the boiler outlet reaches a preset value T _A. Repeat alternately. After the temperature of the heat medium at the outlet of the boiler reaches a preset value T _A , the start control is terminated and the operation control is switched to normal operation.

In the embodiment shown in FIG. 3, the heating medium is operated in a state in which the circulation amount of the heating medium is smaller than that in the normal operation. Specifically, the circulation of the heat medium is reduced by reducing the rotation speed of the circulation pump (2) by inverter control and by reducing the opening of the motorized valve (12) inserted in the heat medium circulation line (3). Adjust the amount. After the burner (4) is operated by a set time t ₁ and is stopped by the time setting t _2, the operation and stopping of the burner (4) according to the set time t ₁ and the set time t _2, the boiler outlet The heat medium temperature is alternately repeated until it reaches a preset value T _A. After the temperature of the heat medium at the outlet of the boiler reaches a preset value T _A , the start control is terminated and the operation control is switched to normal operation.

In the embodiment shown in FIG. 4, as in the embodiment shown in FIG. 3, operation is performed in a state in which the circulation amount of the heat medium is smaller than that in normal operation. Specifically, the circulation of the heat medium is reduced by reducing the rotation speed of the circulation pump (2) by inverter control and by reducing the opening of the motorized valve (12) inserted in the heat medium circulation line (3). Adjust the amount. And burner
Turn on (4) according to the heat medium temperature at the boiler outlet.
OFF control. That is, when the heat medium temperature at the boiler outlet reaches the preset value T _A , the burner (4) is stopped, and the heat medium temperature at the boiler outlet is set to the preset value T _{A.
When the} temperature has dropped to _{B, the} burner (4) is activated and this burner is alternately activated and deactivated. After the entire heating medium is sufficiently heated and the heating medium temperature at the boiler outlet reaches the preset value T _A , the heating medium temperature at the boiler outlet is preset even after the set time t _{3 has} elapsed. When the value does not drop to T _B , the start control is terminated and the normal operation control is switched to.

[0012]

EFFECTS OF THE INVENTION Since the present invention has the above-described structure, the heating operation of the heating medium at the time of starting the heating medium boiler can be automated to eliminate the complicated work of the conventional manual operation. Therefore, it is possible to reduce the burden on the boiler staff and the restraint time. Also, regarding the heating operation of the heating medium,
It is possible to provide a safe and efficient automatic start-up control method without requiring experience and skill.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of a heat medium boiler system to which the present invention is applied.

FIG. 2 is an explanatory diagram showing an embodiment of the present invention.

FIG. 3 is an explanatory view showing another embodiment of the present invention.

FIG. 4 is an explanatory view showing still another embodiment of the present invention.

[Explanation of symbols]

 1 Heat Medium Boiler 2 Circulation Pump 3 Heat Medium Circulation Line 4 Burner 5 Blower 6 First Temperature Sensor 7 Second Temperature Sensor

Claims (3)

[Claims] 1. A heat medium circulation line (3) having a circulation pump (2) inserted therein, a burner (4) for heating the heat medium in this heat medium circulation line, and a combustion air supply to this burner. In the heating medium boiler (1) equipped with the blower (5),
At the time of starting (1), after operating the burner (4) for the set time t ₁ , the circulation pump (2) is operated for the set time t _{2, and the} burner (4) is operated for these set time t ₁ . _A start control method for a heat medium boiler, characterized in that the operation and the operation of the circulation pump (2) at the set time t ₂ are alternately repeated until the heat medium temperature at the boiler outlet reaches a preset value T _A. . 2. A heat medium circulation line (3) having a circulation pump (2) inserted therein, a burner (4) for heating the heat medium in this heat medium circulation line, and a combustion air supply to this burner. In the heating medium boiler (1) equipped with the blower (5),
When starting (1), operate with the circulating amount of heat medium less than in normal operation, and set the burner (4) for the set time.
After operation by t _1, is stopped by the set time t _2, the operation of the burner (4) according to the set time t _1, and stopping of the burner (4) according to the set time t _2, the heating medium in the boiler outlet _A method for controlling startup of a heat medium boiler, characterized in that the heating medium boiler is alternately repeated until the temperature reaches a preset value T _A. 3. A heat medium circulation line (3) having a circulation pump (2) inserted therein, a burner (4) for heating the heat medium in the heat medium circulation line, and a combustion air supply to the burner. In the heating medium boiler (1) equipped with the blower (5),
When (1) is started, the heat medium circulating amount is smaller than that during normal operation, the burner (4) is operated, and the heat medium temperature at the boiler outlet is set to a preset value T.
When the temperature reaches _A , the burner (4) is stopped, and when the heat medium temperature at the boiler outlet decreases to a preset value T _{B, the} burner (4) is activated, and the burner is operated and stopped at the boiler outlet. Value T of the heat medium temperature at
_Even after the set time t _{3 has} elapsed after reaching _A , the heating medium boiler start control method is characterized in that the heating medium temperature at the boiler outlet is alternately repeated until it does not drop to a preset value T _B.