JP2510802B2 - Simulated heat receiver device for heating furnace - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simulated heat receiver device in a heating furnace.

[0002]

2. Description of the Related Art The amount of heat transferred to an object to be heated is the most important evaluation item in measuring the thermal efficiency of a heating furnace. Further, the flame temperature, which greatly affects the generation of thermal NO, changes depending on the amount of heat transferred to the object to be heated. Therefore, when the heat transfer performance is evaluated or the development test of the low NOx burner is performed by using the experimental furnace, it is desirable to install a heat receiver simulating the object to be heated in the furnace in actuality. However, the conventional heat receiver device has various problems in the following points. That is, as shown in FIG. 1, under the structure in which the rotation of the water-cooled tube is hardened by a fireproof heat insulating material, as shown in FIG. Some are covered with a heat insulating material.

[0003]

The structure shown in FIG. 1 has a heavy weight of about 2 ton / m ³ and has the problems of cracking and breaking of the refractory insulation and nonuniformity of the surface temperature of the box. Has become. In the structure shown in FIG. 2, the deformation of the box due to the pressure fluctuation of the box, the peeling of the heat insulating material due to the deformation, the non-uniformity of the box surface temperature, the difficulty of measuring the box surface temperature, etc. Must be solved.

[0004]

In order to solve the above-mentioned problems, the present invention provides a water-cooling tube in a metal box body in a state of being floated so as not to contact the wall surface of the box body, and at the same time to the box body. Provides a device provided with a ventilation pipe that communicates with the air inside and outside the box.

[0005]

The heat transfer between the water-cooled tube and the surface of the box is performed by radiative heat transfer, and the amount of heat transfer can be easily measured by the temperature and the water amount at the inlet and outlet of the water-cooled tube.
The surface temperature of the box can be changed by changing the surface area of the pipe by increasing or decreasing the curved pipe portion of the pipe. Since the heat transfer between the box surface and the water-cooled tube is due to radiation, the surface temperature becomes more uniform than that due to heat conduction. In addition, since the box has a ventilation pipe that communicates with the outside air, the pressure inside the box can be maintained at atmospheric pressure, deformation due to pressure changes does not occur, and combustion gas does not enter, so the generation of condensed water is suppressed. can do.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 1 is a box made of stainless steel, in which a water cooling tube 2 is floated so as not to contact the inner wall surface 3. As a method of the device, any well-known means such as using a spacer may be used. In short, the water cooling tube 2 may be supported so as not to contact the inner wall surface 3 of the box body 1. Then, a hole is provided in the box body 1, the water cooling tube 2 is installed through this hole, and the gap is sealed. Further, the box body 1 is provided with a ventilation pipe 4 for communicating the inside of the box body 1 with the outside air.

When the box body 1 is installed in the furnace and the furnace is operated, the box body 1 is heated by flame, combustion gas, and heat transfer from the inner wall of the furnace. In this way, the surface of the box body 1 becomes hot and heats the water-cooled tube 2 installed therein by radiant heat transfer. At this time, since the pressure inside the box body is maintained at the atmospheric pressure because the ventilation pipe 4 is provided, the deformation of the box body 1 due to the volume expansion of the air inside the box body does not occur. Therefore, once the water cooling tube 2 is installed, it can be stably supported regardless of the method of the device. Further, since the vent pipe 4 communicates with the outside air, the combustion gas does not enter the box body 1 and the generation of condensed water can be prevented. Furthermore, since heat transfer between the box 1 and the water-cooled tube 2 is performed by radiant heat transfer, the surface temperature of the box 1 becomes more uniform than that by heat conduction. Further, when increasing the surface temperature of the box body 1, the surface area of the pipe may be reduced to reduce the amount of radiant heat transfer, and conversely, when decreasing the temperature, the surface area may be increased. In this way, by passing cooling water of about 30 to 60 ° C. through the water cooling tube 2, the box 1
The surface temperature can be set to about 100 to 1200 ° C.

[Experimental Example] A furnace having a width of 1.2 m, a height of 1.1 m, and a length of 3.8 m was charged with the heat receiving device according to the present invention, and the temperature of the furnace was about 1300 ° C. The body surface temperature is heated to about 900 ° C. The test was repeated 7 times. Total test time is
It was 20 hours. [Results] It was confirmed that the device of the present invention showed no deformation and could withstand repeated use. Moreover, almost no condensed water was generated, and in addition, the heat flux could be measured by increasing the water amount and the water temperature.

[0009]

EFFECTS OF THE INVENTION As described above, the present invention is lightweight and has no deformation of the box body, and the heat uniformity is small due to the uniform temperature of the box surface, and the generation of condensed water is suppressed. The durability is improved and the heat transfer amount can be easily and repeatedly measured. As a result, there is an effect that the combustion test can be executed in a state close to the actual operation.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a conventional device.

FIG. 2 is an explanatory diagram of a conventional device.

FIG. 3 is an explanatory view of the device of the present invention.

[Explanation of symbols]

 1 Box 2 Water cooling tube 3 Inner wall surface 4 Ventilation tube

Claims (1)

(57) [Claims] 1. A water-cooling tube is installed in a metallic box body in a state of being floated so as not to contact the wall surface of the box body, and a ventilation pipe for communicating the box body and the outside air is provided in the box body. Heat receiver device for a heated furnace.