JPH04306422A - Heater device - Google Patents

Abstract

PURPOSE:To prevent decomposition of thermal medium and deterioration of a heater by a method wherein each of a discharging pipe from an outlet port of a heater and a surface of the heater is provided with a temperature sensing means and a control mechanism is provided for controlling an amount of combustion of a burner in response to a difference in sensing temperatures of two sensing means. CONSTITUTION:As thermal medium within a heater 1 is rapidly evaporated and a thermal medium temperature at an upper part of the heater 1 is increased, a temperature of the second temperature sensing means 10 is increased, and in turn as a temperature difference exceeds a set value, an amount of combustion of a burner 8 is decreased. In this way, even if an amount of combustion of the burner 8 is decreased, the amount of combustion is decreased in a stepwise manner when the temperature difference is in its increasing tendency. A degree of rapid evaporation of the thermal medium within the heater 1 when a heating is energized is taken in response to a temperature difference between the two temperature sensing means 9 and 10, an amount of combustion of the burner 8 is increased or decreased, thereby a rapid evaporation of the thermal medium is restricted, a pressure loss within the heater 1 is reduced and a staying of gaseous thermal medium at the upper part in the heater 1 is reduced.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for heating using a phase change between a working medium of steam and liquid.

0002

2. Description of the Related Art Conventionally, a heating device of this type has been constructed as shown in FIG.

That is, a heater 1, a gas-liquid separator 2, and a radiator 3 are provided in this order from the bottom to the top, and a discharge pipe 4 rises from the upper outlet of the heater 1 to the upper part of the gas-liquid separator 2. A bypass pipe 6 is provided to bypass the bottom of the gas-liquid separator 2 to a return pipe 5 that connects the bottom of the heater 1 and the radiator 3, and an outgoing pipe 7 is provided that connects the top of the gas-liquid separator 2 and the radiator 3. ing. Further, 8 is a burner that heats the heat medium in the heater 1.

In the above structure, the operation is as shown by the arrow in the figure. The heating medium heated by the burner 8 in the heater 1 increases in pressure, and in a two-phase state of vapor and liquid, gas and liquid are discharged from the discharge pipe 4. It flows into the separator 2. The vapor is separated into vapor and liquid by the gas-liquid separator 2, the vapor enters the outgoing pipe 7, and the liquid accumulates in the gas-liquid separator 2.

The vapor heat medium flows into the upper part of the radiator 3 from the outgoing pipe 7, radiates heat, condenses and liquefies, and enters the return pipe 5 from the lower part of the radiator 3. The liquid heat medium flows into the heater 1 due to the height difference between the heater 1 and the radiator 3. Further, the liquid heat medium accumulated in the gas-liquid separator 2 flows into the return pipe 5 from the bypass pipe 6, merges with the liquid heat medium on the radiator 3 side, and enters the heater 1. Heating is performed through this cycle.

[0006]

However, in the above configuration, if the combustion amount in the burner 8 is increased when the cycle pressure is low, such as when starting the device, the heater 1
The heating medium inside the heater 1 rapidly evaporates, the pressure loss in the heater 1 increases, and the heating medium accumulates in the upper part of the heater 1 as a gas heating medium. As a result, the temperature of the heat medium above the heater 1 rises abnormally, resulting in an overheated state, which causes problems such as decomposition of the heat medium and deterioration of the heater 1.

Furthermore, when the amount of combustion in the burner 8 is large, a large amount of low-temperature, low-pressure two-phase heat medium enters the gas-liquid separator 2, so that the heat medium in the gas-liquid separator 2 flows from the outgoing pipe 7 to the radiator 3. Since the heater 1 is taken out, the heating medium cannot be sufficiently supplied to the heater 1, so the temperature of the heating medium at the upper part of the heater 1 rises, resulting in an overheated state.

The present invention solves this problem by ensuring that a liquid heat medium always exists in the heater 1 when the device is started up, and
The purpose is to prevent abnormal overheating during the transient state of the cycle in the heater 1, and to ensure reliability of the equipment and stable heating.

[0009]

[Means for solving the problem] A heater, a gas-liquid separator, and a radiator, which are arranged in order from the bottom to the top, are connected in a ring through a pipe,
A first temperature detection means is provided in the discharge pipe line leading from the outlet of the heater to the gas-liquid separator, and a second temperature detection means is provided on the surface of the heater.The heater is equipped with a burner, and when the device is started, the first temperature detection means is provided. A control mechanism is provided to control the amount of combustion in the burner according to the temperature difference between the temperature detection means and the second temperature detection means.

0010

[Operation] With the above configuration, when the heating device is started, the present invention
If the detected temperature difference between the first temperature detection means provided on the discharge pipe and the second temperature detection means provided on the surface of the heater is on the positive side (i.e.
When the surface temperature of the heater is higher than that of the discharge pipe), the burner combustion amount is decreased, and conversely, when the temperature difference tends to decrease, the burner combustion amount is increased. As a result, the evaporation of the heat medium in the heater is adjusted by increasing or decreasing the amount of burner combustion, reducing the pressure loss in the heater and reducing the retention of the gas heat medium in the upper part of the heater. By reducing the accumulation of gas heat medium in the heater, the flow of the heat medium at the top of the heater is smoothed, suppressing the abnormal temperature rise of the heat medium at the top of the heater, and preventing the decomposition of the heat medium and the heating Prevent deterioration etc.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. Note that the same reference numerals as in FIG. 3 indicate the same members and have the same functions, so a detailed explanation will be omitted and the explanation will focus on the differences.

In FIG. 1, reference numeral 9 denotes a first temperature detection means provided in the discharge pipe 4 from the outlet of the heater 1 to the gas-liquid separator 2.
10 is a second temperature detection means provided on the surface of the heater 1. 11 is the first temperature detection means 9 and the second temperature detection means 10.
This is a control mechanism that controls the combustion amount of the burner 8 based on the detected temperature difference.

Next, the operation of the configuration of this embodiment will be explained based on FIG. 2. From FIG. 2, the horizontal axis shows the elapsed time from the start of heating, the vertical axis shows the burner 8 combustion amount Q, and the first,
The temperature difference T between the second temperature detection means 9 and 10 is determined.

First, after heating is started, the combustion amount Q of the burner 8 is operated by the control mechanism 11 at the maximum combustion amount Q1 while the temperature difference T is a set value T1. However, when the heat medium in the heater 1 rapidly evaporates and the temperature of the heat medium at the top of the heater 1 rises,
When the temperature of the second temperature detection means 10 rises and the temperature difference exceeds the set value T1, the combustion amount of the burner 8 changes from Q1 to Q2.
decreases to Even if the combustion amount of burner 8 decreases to Q2, the temperature difference still rises and when it goes from T1 to T2, the combustion amount is reduced to Q2.
Decrease from 2 to Q3. Even if the combustion amount Q is reduced in this way, if the temperature difference T tends to rise, the combustion amount Q is reduced in steps. By reducing the combustion amount of burner 8, the temperature difference T tends to decrease (T in the figure
4 to T3), the combustion amount of the burner 8 is increased from Q4 to Q2 to Q1. By repeating this, the temperature difference is stabilized at the set value T1 with the combustion amount Q1 of the burner 8.

[0015] With this, the degree of rapid evaporation of the heat medium in the heater 1 at the time of starting heating is detected by the temperature difference T between the two temperature detection means 9 and 10, and by increasing or decreasing the combustion amount Q of the burner 8. , suppressing rapid evaporation of the heat medium, reducing pressure loss within the heater 1, and reducing retention of the gas heat medium in the upper part of the heater 1. Furthermore, since the combustion amount of the burner 8 is controlled at the time of startup, a large amount of heat medium is not taken out to the radiator 3 side at once.

In this way, by controlling the amount of combustion in the burner 8 at the time of starting heating, an abnormal temperature rise in the heat medium at the upper part of the heater 1 is suppressed, and decomposition of the heat medium and deterioration of the heater 1 are prevented. It can be prevented.

[0017]

As described above, according to the heating device of the present invention, the temperature detection means is provided in each of the discharge pipe from the heater outlet and the surface of the heater, and the By providing a control mechanism for controlling the combustion amount of the burner, the following effects can be obtained. (1) Suppress pressure loss in the heater due to rapid evaporation of the heat medium inside the heater when heating starts, reduce retention of gas heat medium in the upper part of the heater, and prevent abnormal temperature rises in the heater and heat medium. This prevents decomposition of the heat medium and deterioration of the heater. (2) Prevents a large amount of heat medium from being taken out to the radiator when heating is started, secures the heat medium necessary for the heater, and suppresses abnormal temperature rise of the heat medium in the heater.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a heating device according to an embodiment of the present invention.

[
FIG. 2: Graph for explaining the operating state of the control mechanism of the present invention

[Figure 3] Configuration diagram of a conventional heating device

[Explanation of symbols]

1 Heater 2 Gas-liquid separator 3 Heatsink 4 Discharge pipe line 8 Burner 9 First temperature detection means 10 Second temperature detection means 11 Control mechanism

Claims (1)

[Claims] Claim 1: A heater, a gas-liquid separator, and a radiator provided in order from the bottom to the top are connected in an annular pipe line, and a first temperature detection means is connected to the discharge pipe line from the outlet of the heater to the gas-liquid separator. and a second temperature detection means on the surface of the heater, the heater is equipped with a burner, and when the device is started, the amount of combustion in the burner is determined according to the temperature difference between the first temperature detection means and the second temperature detection means. A heating device equipped with a control mechanism.