JPS6155582A - Heat exchanger utilizing waste heat - Google Patents

Abstract

PURPOSE:To improve safety substantially by a method wherein the temperature of a heat exchanger pipe is kept at about 100 deg.C even if the heat exchanger is heated without having any fluid therein and the damage of the heat exchanging pipe is not occurred. CONSTITUTION:A heat exchanging pipe 3 is arranged is the discharging cylinder 2 of an ignition unit and at the same time the inlet end 3a of the heat exchanging pipe 3 is taken out at the lower part of the discharging cylinder 2 and further the outlet end 3b of the heat exchanging pipe 3 is taken out from the upper part of the discharging cylinder 2, and a cooling part 4 is arranged at the outlet end part 3b of the heat exchanging pipe 3 at the outside of the discharging cylinder 2. As a result, even if the heat exchanger is ignited without having any fluid, it is possible to keep a temperature of the heat exchanging pipe at about 100 deg.C. Due to this fact, the damage of the heat exchanging pipe is not occurred, its durability is improved and the life of the device is extended. Even if a rubber pipe or coupling is used, the deterioration of the unit caused by overheated steam is not made, the injection of the overheated steam is not carried out and the safety of the unit can be improved.

Description

[Detailed description of the invention] 【Technical field】

The present invention is a heat exchanger that increases the temperature of the fluid by exchanging heat between the exhaust gas of combustion equipment such as a chimney-type kerosene stove, kerosene water heater, or oil water heater, and water or other fluid circulating in a heat exchange pipe. The present invention relates to a technique for preventing 21 failures caused by boiling of fluid in a vessel.

[Background technology]

This type of heat exchanger is used by connecting a terminal device such as a floor heating panel 6, as shown in FIG. 3
The circulation unit 7 heats the hot water, sends this hot water to the floor heating panel 6, the heat of the hot water is radiated indoors by the floor heating panel 6, and the hot water whose temperature has been lowered by the heat radiation is circulated again to the heat exchange pipe 3. It is used to warm the body externally. By repeating this operation, the room is heated. In the existing heat exchanger used in this system, as shown in Fig. 5, the double supplementary exhaust gas #J2 is exhausted by the inner cylinder 8 and the outer cylinder 9, and the It has a structure in which a coil-shaped heat exchange pipe 3 is arranged in the gap, and when cleaning soot attached to the inside of the heat exchanger, the outer cylinder 9 is used.
In order to easily take out the heat exchange pipe 3 from the exhaust pipe 2, the outlet end 3b of the heat exchange pipe 3 is returned linearly toward the inlet end 3a within the exhaust pipe 2. :I #? 1it part 3b and entrance side end part 3a
were brought closer together. Further, a circulation pump 10 and a tank 11 for absorbing expansion and contraction of water were built in the circulation unit 7 connected to the piping 12. However, with this structure, if you forget to turn on the circulation unit 7 or the pump 10 inside the circulation unit 7
If the water in the heat exchange pipe 3 does not circulate, such as when the pump 10 runs dry due to air entering the exhaust pipe 2,
Because the temperature of the combustion gas in the heat exchange pipe 3 is as high as 400 to 500°C, water boils in the heat exchange pipe 3, turns into steam, and pushes the water in the heat exchange pipe 3 back to the tank 11 in the circulation unit 7. The pipe 3 is in an empty state. In this way, when the air is heated, the inside of the heat exchange pipe 3 becomes superheated steam,
The temperature of the heat exchange pipe 3 is the combustion gas temperature of 400 to 500
As a result, ■Heat exchange pipe 3
If the material is copper, oxidation of the pipe surface will occur rapidly and the heat exchange pipe 3 will deteriorate, and in extreme cases, holes will form in the heat exchange pipe 3, causing water leakage and making it unusable as a heat exchanger. The rubber suddenly deteriorated at the joint 12n of the piping 12 made by Com and the heat exchange pipe 3, causing the piping 12 to deteriorate.
may rupture due to internal pressure, or superheated steam may blow out from the gap between the joint between the heat exchange pipe 3 and the pipe 12, which can be extremely dangerous. ■If the capacity of the tank 11 is small, the heat exchange pipe 3 may The water pushed back from tank 11
Problems such as overflowing and spilling were occurring.

[Purpose of the invention] The present invention has been made in view of the technical background described above, and its purpose is to dry the heat exchanger so that even if the fluid boils, it can be used as a secondary heat exchange pipe, etc. Our goal is to provide a safe and reliable heat exchanger that utilizes waste heat to prevent accidents. [Illustration of the invention]

The exhaust heat utilization heat exchanger of the present invention has an exhaust heat fI2 of the combustion equipment 1.
A heat exchange pipe 3 is disposed inside I2, and the inlet end 3a of the heat exchange pipe 3 is taken out from the lower part of the exhaust pipe 2.
The outlet end 3b of the heat exchange pipe 3 is taken out from the upper part of the exhaust pipe 2, and a cooling part 4 is provided at the exit end 3b of the heat exchange pipe 3 outside the exhaust pipe 2. This led to the achievement of the above objective. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. 1 is a combustion device, such as a boiler, a chimney stove, an oil water heater, a gas water heater, etc., and 2 is a combustion device 1.
This is the chimney part of the exhaust pipe from which high-temperature combustion gas is exhausted. The exhaust ffJ2 is formed into a double cylinder shape by an inner cylinder 8 and an outer cylinder 9, and combustion gas is introduced from the lower end surface of the outer cylinder 9 and exhausted from the upper end surface of the outer cylinder 9. A gun bar 13 that can be opened and closed is provided on the lower end surface of the inner #J8 that penetrates vertically. However, Gumper 13
By rotating the opening of the lower end surface of the inner cylinder 8, a part (or almost all) of the combustion gas can pass through the inner cylinder 8, thereby reducing the gap between the inner cylinder 8 and the outer cylinder 9. The amount of combustion gas passing through can be adjusted to adjust the amount of heat exchange. Reference numeral 3 denotes a coil-shaped heat exchange pipe made by Company 1, and the heat exchanger is constructed by disposing the heat exchange pipe 3 inside the exhaust pipe 2, and the inlet side end 3a of the heat exchange pipe 3 and The outlet side end portion 3b passes through the upper and lower parts of the exhaust pipe 2, respectively, and is drawn out to the outside of the exhaust pipe 2. Furthermore, the outlet side end 3b of the heat exchange pipe 3 is bent down almost vertically in the atmosphere outside the exhaust pipe 2 to approach the inlet side end 3a, and this relatively long vertical portion is connected to the cooling section 4. This allows heat to be dissipated into the fire. The heat exchanger configured as described above is connected to a floor heating panel 6 and a circulation unit 7 as terminal devices via piping 12, for example, as shown in FIG. 4, and performs indoor heating from the floor. There are things you can do. Since the heat exchanger of the present invention has the cooling section 4 as described above, when dry heating occurs, the fluid in the heat exchange pipe 3 boils and becomes steam, but this steam is transferred to the exhaust pipe. It is cooled in a cooling section 4 outside of the 2 and returns to water here. Therefore, as shown in Fig. 1, a head difference H occurs in the fluid within the heat exchange pipe 3, the fluid within the heat exchange pipe 3 naturally circulates, and new water is constantly discharged from the inlet end 3a. It is supplied to the heat exchange pipe 3 in the cylinder 2 and boiled there again. As this operation is repeated, the temperature inside the heat exchange pipe 3 decreases to 100%.
This allows the temperature to be maintained at around °C, thereby avoiding secondary JZ failures. That is, since the steam is quickly cooled and condensed in the cooling section 4, the heat exchange pipe 3 and piping 12
This prevents the temperature from rising excessively, and the vapor pressure does not affect the terminal equipment, circulation unit 7, etc. The device shown in FIG. 2 is another example of the present invention (I), in which fins 5 are provided on the surface of the cooling section 4 to improve heat radiation efficiency. This example uses combustion (the heat generating capacity of the burner is large,
This is effective when the cooling capacity of the cooling section 4 simply exposed to the air is insufficient. FIG. 3 shows still another example of the present invention, in which the cooling section 4 is formed into a coil shape, and the effective length (cooling area) of the cooling section 4 is increased to increase heat dissipation efficiency. Note that the present invention is not limited to an open type floor heating system in which the tank 11 in the circulation unit 7 is open to the atmosphere as shown in the conventional example in the tlsG diagram, but also in which the tank 11 and the entire IJ' system are of a closed type. It is also useful for sealed types.

【Effect of the invention】

Since the present invention is manufactured as described above, the temperature of the heat exchange pipe is maintained at around 100°C even when the heat exchanger is heated dry, and therefore, the heat exchange pipe is not damaged and is durable. Improved product strength and lifespan; ■Even when rubber piping and fittings are used, there is no deterioration due to overheated steam, and no overheated steam blows out, greatly improving safety; ■Open type. When used in floor heating systems, etc., there is an advantage that the temperature rise during dry heating is small, so less water is returned from the heat exchange pipe, the tank capacity is also small, and the circulation unit becomes empty.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is a sectional view showing another example of the invention, Fig. 3 is a sectional view showing still another example of the invention, and Fig. 4 is a heat exchanger. A perspective view showing an example of how the device is used,
Fig. 5 is a sectional view of the conventional example, and Fig. m6 is an explanatory diagram for explaining the function and drawbacks of the same as above, 1 is a combustion equipment, 2 is an exhaust stack, 3 is a heat exchange pipe, and 3a is a heat exchange pipe. The inlet side end 3b is a heat exchange pipe, and the outlet side end 3b14 is a cooling section. Agent Patent Attorney Ishi 1) Chief 7th No. 2 EiH93 Procedural Amendment (Voluntary) November 5, 1980

Claims (2)

[Claims] (1) A heat exchange pipe is installed inside the exhaust stack of the combustion equipment, the inlet end of the heat exchange pipe is taken out from the bottom of the exhaust stack, and the outlet end of the heat exchange pipe is taken out from the top of the exhaust stack. A heat exchanger utilizing waste heat, characterized in that a cooling section is provided at the outlet side end of a heat exchange pipe outside an exhaust stack. (2) A heat exchanger utilizing waste heat according to claim 1, characterized in that a cooling part of the heat exchange pipe is provided with heat radiation fins.