JPH05149537A - Controller for burner - Google Patents

Abstract

PURPOSE:To suppress energy consumption more than necessary for preventing freezing and to prevent local freezing by sensing an atmospheric temperature of a part to be protected against freezing of a heat exchanger, and altering a freezing operation mode in response to the temperature. CONSTITUTION:A temperature sensor 4 is disposed near a place 3a to be easily frozen of a heat exchanger 3, and its output is introduced to freezing preventing means 5. At a freezing prevention starting temperature Tf, a control signal is so generated from the means 5 as to become an intermittent burning operation of 3min of burning time and 30min of stopping time. At a freezing prevention starting temperature Tf1, an intermittent burning operation of 3min of burning time and 20min of stopping time is conducted. Thus, since a stepwisely intermittent burning operation responsive to the dangerous degree of freezing is executed, energy consumption more than necessary can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a combustor that performs hot water heating, hot water supply, etc. by burning gas and oil.

[0002]

2. Description of the Related Art In a conventional combustion device that uses water as a heat medium as a control device for a combustor, the heat generated when the temperature of the environment in which the device is placed (often outdoors) is reduced when the device is not in combustion. There is a possibility of freezing in the exchanger or piping system.

In order to prevent this freezing, generally, the temperature near the heat medium is detected as a means for preventing freezing, and when the temperature becomes lower than the temperature at which there is a possibility of freezing, another freezing prevention different from the original operation mode is performed. It has been common to enter an operation mode and perform intermittent combustion or operate a medium circulation pump.

[0004]

However, in such an anti-freezing operation mode, below the anti-freezing operation mode start set temperature Tf, as shown in FIG. 3, the operating state is always the same regardless of the actual medium temperature. Therefore (in the figure, the antifreeze operation has a combustion time of 3 minutes and a stop time of 1
0 minutes), there is a risk that more energy will be consumed than necessary for the antifreezing operation, or that the freezing cannot be sufficiently followed and local freezing in the piping system may occur.

In view of the above situation, it is an object of the present invention to provide a control device for a combustor, which solves the above problems by changing the operation mode of the antifreezing operation according to the temperature near the medium. is there.

[0006]

SUMMARY OF THE INVENTION The present invention comprises a combustion device,
In a combustor equipped with a heat exchanger for exchanging heat between the combustion gas of this combustion device and water, a temperature sensor that detects the ambient temperature of a portion of the combustor that easily freezes, and a temperature sensor that detects the temperature An antifreezing means for selecting one of a plurality of antifreezing operation modes and operating the combustion device based on the selected antifreezing operation mode is provided.

[0007]

As described above, the temperature sensor placed at the location where the combustor is most likely to freeze detects the temperature, and for example, intermittent combustion operation is performed below the freezing prevention operation start temperature, but the operation mode is changed depending on the temperature near the medium. In other words, as the temperature decreases, a higher amount of heat is given to the medium to enhance the antifreezing ability.

[0008]

The present invention will be described below with reference to the drawings of the embodiments.

FIG. 1 shows a combustor serving as a gas combustor for hot water heating, and 1 is a combustor having a gas combustor 2 disposed below it, and a pipe-shaped heat exchanger 3 is provided around the outer periphery of the combustor 1. A temperature sensor 4 having a temperature sensitive element is arranged in the vicinity of a portion 3a which is easily frozen, and the output of the temperature sensor 4 is guided to the freeze prevention means 5 serving as a control circuit.
The control signal which is the output of the antifreezing means 5 is used as the combustion device 1.
The gas valve 6 in the front stage of the gas combustion section 2 and the circulation pump 7 in the rear stage of the heat exchanger 3 are introduced.

Next, this operation will be described. It is a pipe outlet position where the pipe-shaped heat exchanger 3 of the combustion device 1 which becomes a water (medium) circuit, which is a water (medium) circuit, is easily exposed to the outside air. The temperature sensor 4 arranged in the vicinity of the heat exchanger 3 detects the ambient temperature of the portion 3a that easily freezes.

In this case, the antifreezing start temperature is detected in a plurality of stages such as Tf, Tf1, Tf2, etc. as shown in FIG. 2, and the antifreezing operation in which the combustion time and the stop time are different according to the plurality of stages. Try to change modes. That is, when the value of the antifreezing start temperature Tf is reached, the operation mode is set, and the antifreezing operation at this time is a combustion time of 3 minutes and a stop time of 30 minutes.
A control signal is issued from the antifreezing means 5 so that intermittent combustion operation for a certain period is performed. When the value of the antifreezing start temperature Tf1 is reached, the operation mode is set. At this time, the anti-freezing operation has a combustion time of 3 minutes and an intermittent combustion operation of 20 minutes of stop time. When the value of the anti-freezing start temperature Tf2 is the operation mode, the intermittent combustion operation has a combustion time of 3 minutes and a stop time of 3 minutes. It will be 10 minutes. In this way, since the intermittent combustion operation is performed stepwise according to the degree of freezing risk, unnecessary energy consumption is suppressed.

[0012]

As described above, the control device for a combustor according to the present invention detects the ambient temperature of the portion of the heat exchanger to be frozen and protected, and changes the freezing operation mode in accordance with the temperature. It is possible to suppress unnecessary energy consumption for preventive operation and prevent local freezing in the piping system.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a control device for a combustor showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the freeze prevention operation mode.

FIG. 3 is an explanatory diagram of a conventional freeze prevention operation mode.

[Explanation of Codes] 1 Combustion device 3 Heat exchanger 4 Temperature sensor 5 Freezing prevention means

Claims (1)

[Claims] 1. A combustor including a combustor and a heat exchanger for exchanging heat between combustion gas and water of the combustor, and a temperature sensor for detecting an ambient temperature of a portion of the combustor that is likely to freeze. Combustion, characterized by comprising: antifreezing means for selecting one of a plurality of antifreezing operation modes according to the temperature detected by the temperature sensor and operating the combustion device based on the selected antifreezing operation mode. Machine control device.