JPS62238315A - Contact heat transmission surface of exhaust gas cooler in exhaust gas treatment device of metallurgical furnace - Google Patents

Abstract

PURPOSE:To increase strength and to obviate the generation of deflection and oscillation by providing many heat transmission pipes in a checker pattern to the inside of an exhaust gas cooler, and connecting the heat transmission pipe by center fins to form contact heat transmission surfaces. CONSTITUTION:The heat transmission pipes 10 are bent zigzag in the exhaust gas cooler 2 and are supported to a water cooling wall 12 by means of supports 13. The heat transmission pipes 10 are arranged to the checker pattern and are connected by means of the center fins 14 along the gas flow direction to a panel shape by which the strength is increased. The heat transmission pipes formed into the panel shape in the cooler 2 segment gas flow passages to regulate the flow of the gas and therefore, the generation of vortexes and turbulence is obviated and the deposition of dust to the heat transmission pipes 10 is decreased. The leakage of gaseous CO to the outside is prevented and the safety of an exhaust gas treatment device of a metallurgical furnace is improved.

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] An outline of a metallurgical furnace exhaust gas treatment device will be explained with reference to FIG.

The metallurgical furnace 1 generates high-temperature CO gas containing a large amount of dust. This high-temperature CO gas is induced by an induced blower 6, passed through a cold 1!1 unit 2, cooled, and then passed through a dust remover 4.5 to remove dust, and then collected as a valuable gas in a gas holder 7. Ru. By switching the switching damper 9, the exhaust gas with a low COW degree at the beginning of blowing and before dawn is combusted at the top through the chimney 8, and then released into the atmosphere.

A contact heat transfer surface 3 is provided inside the cooler 2 to recover the heat retained in the exhaust gas. The contact heat transfer surface 3 is formed by providing bare heat transfer tubes 10 in a meandering manner inside the cooler 2 as shown in FIG. 4, and also arranging them in a staggered manner as shown in FIG. Therefore, although it is good in terms of heat absorption, it is disadvantageous in terms of maintenance. In addition, since the heat exchanger tubes 10 are made of round pipes in conjunction with the staggered arrangement, there is a lot of dust D deposited on the front and rear sides of the heat exchanger tubes 10 relative to the exhaust gas flow, as shown in FIG. 5, which reduces the contact heat transfer efficiency. It is low. As a solution to such problems, there is an exhaust gas cooler described in Japanese Utility Model Application Laid-Open No. 60-99499, which was jointly filed by the present applicant with other companies. 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 disk 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 the hook 13a attached to the side wall 12 of the cooler 2. Pull member 13b! It was made to be easy to understand.

[Problems to be Solved by the Invention] By the way, in the conventional contact heat transfer surface 3', the seventh
As shown in the figure, a vortex is generated on the rear side of the heat exchanger tube 10 with respect to the gas flow direction, and this 'i! ! Dust D by 4th stream
Floods up and sticks to the area. 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, but this bending will generate vibrations, causing the support 13 to break 10.

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 problems listed in L consists of arranging a large number of heat transfer tubes in a grid pattern inside the exhaust gas cooler. However, 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 in this way, since the heat transfer tubes are reinforced by the center fin, the strength is increased, and the contact heat transfer surface does not bend or vibrate.

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 and dust adhesion to the heat exchanger tubes is significantly reduced.

EXAMPLE 1 An example of the contact heat transfer surface of the exhaust gas cooler according to the present invention will be explained in detail with reference to FIGS. 1 and 2. FIG.

In the figure, the heat exchanger tube 10 is bent into a meandering shape and is supported by a support 13 on a water cooling wall 12 that constitutes a side wall of the cooler 2. The heat exchanger tubes 10 are arranged in a checkerboard pattern 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 contact heat transfer surface 3'' configured in this manner has increased strength because the heat transfer tubes 10 in the gas flow direction connected by the center fin 14 are panel-shaped.

Furthermore, as shown in FIG.
Since the gas flow path is divided and the gas flow is rectified, no eddies or turbulence are generated therein, the dust is carried along with the gas flow, and the adhesion of dust to the heat exchanger tubes 10 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 inside the cooler, and the heat transfer tubes are connected to the center fin along the gas flow. Since the heat exchanger tubes are connected by ” deposition is significantly reduced and contact heat transfer efficiency is significantly improved. Moreover, the flow resistance of the gas flowing inside the exhaust gas cooler is maintained substantially constant, and there is no leakage of COO20 to the outside, so there are effects such as improving the safety of the metallurgical furnace exhaust gas treatment apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 show an embodiment of the present invention, in which FIG. 1 is a front view of a 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] Inside the exhaust gas cooler of the metallurgical furnace exhaust gas treatment equipment, a large number of heat transfer tubes are arranged in a grid pattern, and these heat transfer 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 by comprising a contact heat transfer surface.