JPH0140084B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in the contact heat transfer surface of an exhaust gas cooler in a metallurgical furnace exhaust gas treatment device.

[Prior Art] The outline of a metallurgical furnace exhaust gas treatment device will be explained with reference to FIG.

From metallurgical furnace 1, high-temperature gas containing a large amount of dust is produced.
CO gas is generated. This high-temperature CO gas is induced by an induced blower 6, passes through a cooler 2 to be cooled, and then passes through dust removers 4 and 5 to remove dust, and is then recovered in a gas holder 7 as a valuable gas. The exhaust gas at the beginning and end of blowing with low CO concentration is
By switching the switching damper 9, the fuel is combusted at the top through the chimney 8 and then dissipated into the atmosphere.

A contact heat transfer surface 3 is provided inside the cooler 2 to recover the heat retained in the exhaust gas. As shown in FIG.
As shown in the figure, they are arranged in a staggered manner. Therefore, although it is good in terms of heat absorption, it is disadvantageous in terms of maintenance. In addition, heat exchanger tubes 1 are arranged in a staggered manner.
Since the heat exchanger tube 10 is made of a round pipe, there is a lot of dust D deposited on the front and rear sides of the heat exchanger tube 10 relative to the exhaust gas flow, as shown in FIG. 5, and therefore the contact heat transfer efficiency is low. In order to solve these problems, the present applicant jointly applied with other companies in the
There is an exhaust gas cooler described in Publication No. 99499. The contact heat transfer surface of this exhaust gas cooler has heat transfer tubes 10 having fins 11 arranged in a meandering manner as shown in FIG. 6, and arranged in a checkerboard shape as shown in FIG.

Note that 13 is a support for supporting the contact heat transfer surface 3', and this support 13 is attached to a hook 13a attached to the side wall 12 of the cooler 2.
The hook member 13b attached to the hook member 13b is hooked onto the hook member 13b.

[Problems to be Solved by the Invention] By the way, in the conventional contact heat transfer surface 3', as shown in FIG. Due to the eddy current, dust D accumulates and adheres to that part.
The dust D that adheres in this way gradually grows, narrows the gas flow path, increases the flow resistance of the gas in the cooler 2, and also lowers the contact transfer efficiency. Moreover, if left as is, the inside of the cooler 2 may become clogged.

Furthermore, since the heat exchanger tube 10 itself has no strength, there is a problem in that if a large amount of dust adheres to it, it will bend, and this bending will generate vibrations, causing damage to the support 13.

The present invention aims to provide a contact heat transfer surface for an exhaust gas cooler that solves the above-mentioned drawbacks or problems.

[Means for Solving the Problems] The contact heat transfer surface of the exhaust gas cooler of the present invention for solving the above problems includes arranging a large number of heat transfer tubes in a grid pattern inside the exhaust gas cooler, These heat transfer tubes are connected by a center fin along the flow direction of exhaust gas to form a panel-shaped contact heat transfer surface.

[Function] In the contact heat transfer surface configured as described above, the heat transfer tubes are reinforced by the center fin, so the strength is increased, and the contact heat transfer surface does not bend or generate vibration.

In addition, heat transfer tubes arranged in a grid pattern along the gas flow direction are connected by center fins to form a panel shape, so the gas flowing inside the exhaust gas cooler is rectified, and there are no vortices or turbulence. No flow occurs;
Dust adhesion to heat exchanger tubes is significantly reduced.

[Example] An example of the contact heat transfer surface of the exhaust gas cooler according to the present invention will be described in detail with reference to FIGS. 1 and 2.

In the figure, the heat exchanger tube 10 is bent into a meandering shape, and a support 13 is attached to the water cooling wall 12 that constitutes the side wall of the cooler 2.
Supported by The heat exchanger tubes 10 are arranged in a checkerboard shape as shown in FIG. 2, and these heat exchanger tubes 10 are connected by center fins 14 along the gas flow direction to form a panel shape.

The strength of the contact heat transfer surface 3'' thus configured is increased because the heat transfer tubes 10 in the gas flow direction connected by the center fin 14 are shaped like panels.

In addition, as shown in FIG. 2, the inside of the cooler 2 is connected by a center fin 14 and has a panel shape, and the heat transfer tubes 10 divide the gas flow path and rectify the gas flow. No vortex or turbulence is generated, and the dust is carried along with the gas flow, and the dust is transported to the heat exchanger tube 10.
The dust adhesion to is significantly reduced.

[Effects of the Invention] As detailed above, the contact heat transfer surface of the exhaust gas cooler according to the present invention includes a large number of heat transfer tubes arranged in a grid pattern in the cooler, and the heat transfer tubes are arranged along the flow of gas at the center fin. Since the heat exchanger tubes are connected by , the strength of the heat exchanger tubes is increased, vibrations do not occur, and it can be applied to gas flow paths with large spans. Furthermore, since the gas flow is rectified, the adhesion of dust to the heat transfer tubes is significantly reduced, and the contact heat transfer efficiency is significantly improved. Moreover, the flow resistance of the gas flowing inside the exhaust gas cooler is maintained approximately constant, and there is no leakage of CO gas to the outside.
This has the effect of improving the stability of metallurgical furnace exhaust gas treatment equipment.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are one embodiment of the present invention,
FIG. 1 is a front view of the contact heat transfer surface, and FIG. 2 is a cross-sectional view of FIG. 1. Fig. 3 is a schematic diagram of a metallurgical furnace exhaust gas treatment device, Figs. 4 to 7 are conventional examples, Fig. 4 is a front view of the contact heat transfer surface, Fig. 5 is a cross-sectional view of Fig. 4, FIG. 6 is a front view of a contact heat transfer surface using a heat transfer tube with fins, and FIG. 7 is a cross-sectional view of FIG. 6. 1...Metallurgical furnace, 2...Cooler, 3''...Contact heat transfer surface, 10...Heat transfer tube, 14...Center fin.

Claims (1)

[Claims] 1 Inside the exhaust gas cooler of the metallurgical furnace exhaust gas treatment equipment, a large number of heat exchanger tubes are arranged in a grid pattern, and these heat exchanger tubes are connected by center fins along the flow direction of the exhaust gas to form a panel-like structure. A contact heat transfer surface of an exhaust gas cooler in a metallurgical furnace exhaust gas treatment device, characterized in that the contact heat transfer surface is configured as follows.