JPH0434063B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid heating device that can efficiently heat a fluid using a burner.

To heat fluids such as liquids and gases, as shown in Fig. 1, a fluid container b is placed in a furnace body a surrounded by a heat insulating wall, and a fluid container b is placed inside the furnace body a, which allows the fluid to flow in the direction of the arrow. A well-known boiler type is generally used in which a burner c is attached to the burner and the combustion heat of the burner is used to keep the temperature inside the furnace high and heat the fluid container b. However, in a fluid heating device having such a structure, the heat capacity of the furnace body is large, so the fluid cannot be rapidly heated or cooled, and the surface area of the furnace body is large, so there is a lot of wasted heat radiation, resulting in large energy loss, and a large installation space is required. However, since the equipment is large-sized, there are disadvantages such as high cost.

The present invention seeks to eliminate the above-mentioned drawbacks. First, the breathable solid used in the present invention will be explained. The breathable solid is formed by forming a heat-resistant material such as metal or ceramics into a porous shape such as a net shape, a fiber shape, or a honeycomb shape. The figure shows a curve m representing the temperature drop of the high-temperature gas when the gas flows through the air-permeable solid having the thickness t from left to right in the figure. In this way, the temperature of the high-temperature gas flowing through the air-permeable solid is rapidly lowered due to convective heat transfer with the air-permeable solid. As can be seen from this diagram, the inflow side of the high-temperature gas is heated to a higher temperature than the outflow side, so the breathable solid radiates more radiant heat on the inflow side than on the outflow side of the high-temperature gas. However, in the present invention, an inlet at one end,
A combustion chamber facing a part of the outer surface of the pipe wall of the fluid pipe line, in which an outlet is formed at the other end and through which the fluid to be heated flows in a certain direction, is surrounded by the above-mentioned plate-shaped air permeable solid; A burner is installed in the combustion chamber so that the flame is blown out toward the outer surface of the tube wall, and the combustion exhaust gas of the burner is made to flow through a permeable solid to be discharged. The objective is to obtain a fluid heating device that can be adapted to rapid cooling and has excellent thermal efficiency.

Next, an embodiment of the present invention will be described with reference to FIGS. 3 and 4. In the same figure, 1 has an inlet 1a at one end;
A fluid pipe line in which an outlet port 1b is formed at the other end and through which the fluid to be heated flows in the direction of the arrow; 2 is a combustion chamber formed so as to face a part of the outer surface 3 of the pipe wall of the fluid pipe line; , the combustion chamber consists of four trapezoidal plate-shaped air permeable solids 4
A burner 6 is attached to the center of a rectangular lid plate 5 that covers the top surface of the truncated pyramid, and its combustion flame is blown into the combustion chamber 2. Reference numeral 7 indicates a cover member that covers the outside of the breathable solid body 4 with the exhaust gas path 8 in between. In this device, the combustion flame of the burner 6 is blown perpendicularly to the outer surface 3 of the tube wall to directly heat the outer surface 3 of the tube wall, and the high-temperature combustion exhaust gas in the combustion chamber 2 flows through the permeable solid 4 to generate exhaust gas. Since the gas permeable solid 4 is discharged into the passage 8, its inner surface is heated to a particularly high temperature by the high-temperature exhaust gas, and radiant heat is radiated to the outer surface 3 of the vessel wall. Therefore, the amount of thermal energy transferred to the outer surface 3 of the tube wall is large, and the fluid in the fluid conduit 1 can be heated rapidly. By the way, the fluid pipe line 1 is made of a 2 mm thick steel plate (SS41) with a cross section of 40 mm x 400 mm, room temperature air is flowed through the fluid pipe line 1 at 100/min, and the burner 6 is heated to
When burned at 1000kcal/h, room temperature air could be heated to 400℃ in 2.0 minutes after combustion started. In contrast, when the device shown in Figure 1 was tested under the same conditions, it took about 4.9 minutes to heat room temperature air to 400°C. This proves that the fluid heating device of the present invention can heat the fluid to be heated in a short time.

Of course, in order to effectively utilize the thermal energy of the combustion exhaust gas discharged into the exhaust gas path 8, a heat exchanger (not shown) may be provided in the flue to preheat the combustion air of the burner 6. be. Alternatively, a heat exchange pipe (not shown) may be installed in the exhaust gas passage 8 and combustion air may be supplied to the burner 6 through the heat exchange pipe.

As described in the embodiments above, in the fluid heating device of the present invention, the combustion exhaust gas generated in the combustion chamber flows through the breathable solid, and radiant heat is radiated from the breathable solid to the outer surface of the pipe wall of the fluid pipe. As a result, the thermal energy of the combustion exhaust gas can be directly used for heating the fluid pipe line, thereby reducing thermal energy loss and providing a heating device with high thermal efficiency. In addition, there is no need to provide an insulating wall like in conventional boiler-type ones, and the heat capacity of the combustion chamber is small, so it does not take time to heat up and can quickly heat up.
In addition to having the advantage of rapid cooling, it also has various beneficial effects, such as being able to be formed in a small size, requiring less installation space and reducing equipment costs.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of a conventional fluid heating device;
The figure is a diagram showing the characteristics of an air permeable solid, FIG. 3 is a longitudinal sectional view of a fluid heating device showing an embodiment of the present invention, and FIG. 4 is a cross sectional view of FIG. 3. DESCRIPTION OF SYMBOLS 1... Fluid pipe line, 2... Combustion chamber, 3... Outer surface of tube wall, 4... Breathable solid, 6... Burner, 1a...
Inflow port, 1b... Outflow port.

Claims (1)

[Claims] 1. A combustion chamber facing a part of the outer surface of the pipe wall of a fluid pipe line, in which an inlet is formed at one end and an outlet is formed at the other end, through which the fluid to be heated flows in a fixed direction, is surrounded by a plate-shaped breathable solid. and a burner is installed in the combustion chamber so that flame is blown out toward the outer surface of the tube wall, and the combustion exhaust gas of the burner is configured to flow through the breathable solid and be discharged. Fluid heating device.