KR200228259Y1 - Boiler apparatus adopting heat pipes - Google Patents

Abstract

The present invention relates to a boiler, and more particularly, to a boiler apparatus having a structure for improving thermal efficiency by heating a primary heat medium such as oil to heat a heat pipe that is a secondary heat medium. Boiler apparatus according to the present invention, the primary heat exchanger for heating the primary heat medium oil, the circulation pump for circulating the primary heat medium from the primary heat exchanger, the heat pipe radiator heated by the primary heat medium delivered by the circulation pump And a secondary heat exchange tank composed of a water tank for heating water by a heat pipe radiator.

Description

Boiler apparatus adopting heat pipes

The present invention relates to a boiler, and more particularly, to a boiler apparatus having a structure for improving thermal efficiency by heating a primary heat medium such as oil to heat a heat pipe that is a secondary heat medium.

The heat pipe is made by injecting a propane-based heat medium (working fluid) having a low boiling point and a large latent heat of evaporation into a vacuum metal tube, and the working fluid easily changes from liquid to vapor under low pressure conditions. It is a device that transfers heat as latent heat during phase change. Heat pipe has a working temperature range of -70 ℃ to 300 ℃ and can be used as an efficient heat transfer element for general air conditioning and heating, cooling of electronic devices, recovery of waste heat in the middle temperature range, and solar heat collection. The advantage of heatpipes is that they can deliver up to several hundred times the thermal conductivity of copper without a separate power source.

The operating principle of the heat pipe is as follows. The heat pipe is formed by encapsulating a small amount of the working liquid, which is an evaporation medium, inside a metal tube in a closed vacuum state. One end of the metal tube is a heating part, and the other end is a heat dissipation part. When heat is applied to the heating part while the working liquid is sealed, the working liquid is evaporated and transferred to the heat radiating part in a vapor state. The vapor reaching the heat dissipating part while releasing heat is condensed again to become the original liquid, and this circulation is repeated. This action results in superheat conduction, where heat is rapidly conducted at the same temperature throughout the heatpipe.

The theoretical basis for this superheat conduction characteristic of heat pipe is introduced in Korean Utility Model Publication (Application Publication No. 89-5445). According to this, the super-thermal conductivity when applying any heat to the working fluid of the heat pipe, i) the transfer of heat transfer at a very high speed in the vacuum, ii) the boiling point of all the objects in the vacuum state (for example, In the atmosphere, water boils at 100 ° C. but boils at about 60 ° C. or higher in vacuo), iii) the working fluid in the pipe increases in volume when it reaches the ascending boiling point. Distilled water, methanol, potassium, sodium, mercury, etc. are used as a working liquid enclosed in a heat pipe, and metal, Cu, Ni, stainless steel, etc. are used for the material of a metal pipe.

As such, the heat pipe uses only a small amount of working fluid as a heat medium and does not need to circulate a large amount of water, there is no water in the pipe, and there is no fear of corrosion or freezing of the pipe, and the heat pipe itself is a standard product. This simple, low water volume can be used for various boiler facilities, heat exchangers, waste heat recovery devices, etc. because of the advantages of reducing the capacity of the piping and boiler.

However, in the conventional boiler, since the secondary heat medium cannot be heated to 100 ° C. or higher due to the boiling phenomenon of water, which is the primary heat medium, there is a disadvantage in that the thermal efficiency is low and the heating time is long.

Accordingly, an object of the present invention is to provide a boiler apparatus having excellent heat transfer performance, amplifying heat capacity, and greatly reducing heating amount and heating time by using a heat pipe having super heat conduction characteristics as a secondary heat medium.

Figure 1a is a conceptual piping diagram of the present invention

FIG. 1B is a detailed view of the heat pipe radiator of FIG. 1A

2 is a piping diagram according to a specific embodiment of the present invention

Figure 3 is a detailed view of the heat pipe radiator of Figure 2

<Explanation of drawing code>

Primary heat exchanger (10), heating device (12), secondary heat exchange tank (20), water tank (22), heat pipe radiator (24), pipe through which primary heat medium passes (26), heat pipe (28a, b, ...), the heating portion (H) of the heat pipe, the heat pipe heat dissipation portion (I), the heat pipe heating portion pipe 30, expansion tank 100, the primary heat exchanger 102, the circulation pump ( 104, heat pipe radiator 106, water tank 108, secondary heat exchange tanks (110a, b), heat medium pipe 111, heat pipes (112a, b, c), support pipes 113, water inlet 114a, outlet 114b

Overview of the devise

The outline of the present invention is as shown in Figs. 1A and 1B. Largely, it consists of a primary heat exchanger 10 and a secondary heat exchange tank 20. The primary heat exchanger 10 contains ordinary heat medium oil and is heated by a heating device 12 such as electric gas oil. The secondary heat exchange tank 20 has a structure in which a heat pipe radiator 24 is installed inside the water tank 22 storing the boiler circulating water. The water tank 22 has a structure in which low temperature water enters and is heated by the heat pipe radiator 24 to be discharged to the high temperature water, and the heat pipe radiator 24 is constituted by the heat pipe described in the 'prior art' section.

1B is a view showing the structure of the heat pipe radiator 24 in detail. A plurality of heat pipes 28a, b, ... are provided so that the heating portion H of the heat pipe contacts the pipe 26 through which the primary heat medium passes. The heating portion (H) at the lower end of each heat pipe (28a, b, ...) is welded to a separate pipe 30 so that the internal working fluid does not mix with the primary heat medium, but is welded to a separate pipe 30 to form a primary heat medium pipe. It is installed in the form surrounding 26. By doing so, it becomes possible to heat the heating portion H of the heat pipe while the primary heat medium passes through the pipe 26.

When the heat pipe radiator 24 is operated by the primary heat medium, the low temperature water supplied to the water tank 22 is heated, and the discharged high temperature water can be heated or supplied with hot water.

Description of Examples

Figure 2 shows an embodiment embodying the concept of the present invention depicted in Figure 1a. In the configuration, the primary heat exchanger 102 for heating the primary heat medium oil, the circulation pump 104 for circulating the primary heat medium from the primary heat exchanger 102, 1 delivered by the circulation pump 104 It consists of the secondary heat exchange tanks 110a and 110b which consist of the heat pipe radiator 106 heated by the primary heat medium, and the water tank 108 which heats water by the heat pipe radiator 106. In addition, FIG. 2 shows an expansion tank 100 for supplying a heat medium oil to the primary heat exchanger 102.

A detailed view of the heat pipe radiator 106 is shown in FIG. 3. The heat pipe radiator 106 shown in Fig. 2 shows Fig. 3C. The heat pipe radiator 106 is such that the heating unit H contacts the heat medium tube 111 through which the primary heat medium supplied from the primary heat exchanger 102 by the circulation pump 104 passes, and the heat medium tube 111. It is composed of a plurality of heat pipe bundle 112 is installed. Each heat pipe bundle 112 includes three heat pipes 112a, b, and c as a pair, as shown in FIGS. 3B and 3C. Each heat pipe 112a constituting the heat pipe bundle 112 is formed. The lower heating part H of, b, c is in common contact with one heat pipe 111. In addition, the upper heat dissipation part I of each heat pipe is supported by the support pipe 113 (refer FIG. 2 (B)).

In Fig. 3, a bundle of heat pipes is composed of three sets, and the bundles of 25 heat pipes are arranged, indicating that 75 heat pipes are used as a whole. Therefore, since there are two heat pipe radiators 106 as shown in Fig. 2, the total number of heat pipes is 150. However, the number of such heat pipes is arbitrary. This is a matter that the designer can arbitrarily decide when designing a boiler with design factors such as heat capacity and heating area.

The operation of the embodiment of the present invention having the configuration as shown in FIG. The primary heat medium oil of the primary heat exchanger 102 is heated by heating means such as electric gas oil. The primary heat medium oil contains about 60 liters, which are heated to about 300 ° C. The primary heat medium heated to 300 ° C. is injected into the two secondary heat exchange tanks 110a and b by the circulation pump 104, respectively. As the primary heat medium passes through the heating portion H of the heat pipe radiator 106 of the secondary heat exchange tanks 110a and b, the heat pipe 112 is heated to perform its superheat conduction.

When the water contained in the water tank 108 is heated by the super heat conduction action of the heat pipe radiator 106 formed by the heat pipes 112, the high temperature water is discharged to the water outlet 114b. (The final heating temperature of the water can be adjusted as in a normal boiler by means of a temperature sensor and a thermostat.) Then, the water tank 108 is kept at low temperature through the inlet 114a by the action of a pump (not shown). Water is supplied. In this embodiment, the volume of one water tank 108 is about 600 liters.

According to the present invention it is possible to reduce the energy consumption by reducing the operating time of the boiler for heating equivalent to the conventional, it is possible to obtain hot water in a short time when the domestic hot water supply. In addition, despite the improvement in thermal efficiency, the configuration is less complicated than that of a conventional boiler, so it is less difficult to manufacture, and may have an application range equivalent to that of a conventional boiler. By applying the boiler apparatus according to the present invention to a greenhouse of 1500 pyeong, it was possible to maintain the greenhouse at 18 ~ 20 ℃ with a power of about 270kW (heat capacity: 390,000kcal). ).

Claims (3)

A primary heat exchanger for heating the primary heat medium oil, A circulation pump for circulating the primary heat medium from the primary heat exchanger, A boiler apparatus comprising a secondary heat exchange tank including a heat pipe radiator heated by a primary heat medium delivered by a circulation pump, and a water tank for heating water by a heat pipe radiator, The heat pipe radiator of the secondary heat exchange tank is installed such that the heating medium (H) is in contact with the heat medium pipe (111) through which the primary heat medium supplied from the primary heat exchanger by the circulation pump passes. It consists of a plurality of heat pipe bundles 112, each heat pipe bundle 112 is a group of one or more heat pipes (112a, b, c), each of the heat pipes 112a, The lower end heating part (H) of b, c is in common contact with the said heat medium pipe 111, The water tank of the secondary heat exchange tank is a vessel surrounding the heat pipe radiator, the boiler device using a heat pipe, characterized in that having a water inlet (114a) for entering the low temperature water, and a water outlet (114b) for the heated hot water out. The boiler apparatus according to claim 1, wherein the heat pipe bundles of the heat pipe radiator are three in one pair. The boiler apparatus according to claim 1, wherein at least two heat pipe radiators are installed in the water tank of the secondary heat exchange tank.