JPS60181503A - Mounting structure of cowbell - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention is a method for preventing short circuits in combustion girth flow in heating equipment such as tube heating furnaces or waste heat boilers that have a group of horizontal heat transfer tubes in the convection section. The present invention relates to a mounting structure for a corbel that protrudes from the inner surface of a side wall of a convection section.

[Field of Application of the Invention] The present invention is directed to streamlining the assembly work of heating equipment such as tube heating furnaces or waste heat boilers used in petroleum refining, petrochemical, or general chemical plants.

[Background of the invention and problems] Generally, heating equipment such as a tube heating furnace or a waste heat boiler is
It has a heating area consisting of a radiation part and a convection part, and the convection part has
A horizontal heat exchanger tube group is provided in which a large number of heat exchanger tubes such as bare tubes or expanded slope tubes are arranged horizontally. The heat exchanger tube group in the convection section has a heating mechanism that uses combustion gas to heat the fluid flowing inside each heat exchanger tube, so that the flow of combustion gas is meandered to ensure that the combustion gas comes into contact with each heat exchanger tube. The heat exchanger tubes are arranged in a staggered manner in the vertical direction. However, this staggered arrangement of heat exchanger tubes creates a gap between the heat exchanger tubes located at the end of the heat exchanger tube group and the side wall of the convection section, which is wider than the interval between each heat exchanger tube, and the combustion gas This makes it difficult to uniformly heat the entire heat transfer tube group.
A corbel is provided to prevent this.

Conventionally, as shown in FIG. 1, the corbel 2 for preventing a short circuit of the combustion gas in the convection section l is formed in advance as one piece with the furnace wall 4 constituting the side wall 3 of the convection section l. It is something that exists. This corbel 2 enters between the heat exchanger tubes 6 located at the side ends of the heat exchanger tube group 5, thereby making the gap around each heat exchanger tube 6 uniform.

However, since the conventional corbel 2 is formed integrally with the furnace wall 4 in advance, the heat exchanger tube group 5
When installing, the heat transfer tube group 5 is all assembled to the tube bundle (tube support) 7 outside the furnace, and it is impossible to install it by dropping or lifting it from the upper or lower part of the convection section 1 as one piece because it is obstructed by the corbel 2. There is a problem. For this reason, it is possible to remove the row of heat exchanger tubes 6 located at the side end of the heat exchanger tube group 5 and assemble them separately later, or to bundle the heat exchanger tubes 5 without assembling them all into the tube bundle 7. 7 is attached first, and the heat exchanger tube 6 is inserted in the shape of a hairpin or stick. However, it is not easy to work, and the return bend (elbow), which is separate from the heat exchanger tube 6, has to be welded to the heat exchanger tube 6 in a narrow location with poor footing, which makes it difficult to control the quality of welding. This is the current situation.

[Object of the invention] The present invention improves the current state of the art by providing a corbel mounting structure that allows all heat transfer tubes to be assembled into a tube bundle outside the furnace and then attached to the convection section, thereby making it possible to improve heating equipment. The purpose is to streamline assembly work.

[Summary of the Invention] The present invention provides an integrated heat exchanger tube group assembled into a tube bundle after being installed by dropping or lifting it into a convection section.
E. The corbel mounting structure allows the corbel to be easily protruded from outside the furnace to the inner surface of the side wall of the convection section.

[Structure and operation of the invention] A feature of the structure of the present invention is that in heating equipment such as a tube heating furnace or a waste heat boiler having a group of horizontal heat transfer tubes in the convection section, The present invention has a corbel mounting structure in which a corbel that can be inserted from outside the furnace is inserted and fixed into the opening that protrudes from the inner surface of the side wall of the convection section.

According to the corbel mounting structure according to the present invention, the corbel can be easily installed from outside the furnace by inserting and fixing it into the opening formed in the side wall. Instead of being provided at the time of installation, the corbel can be provided after the heat exchanger tube group is installed.

[Example] As shown in FIG. 2, a groove-shaped opening 9 is formed through the furnace wall 4 and casing 8 that constitute the side wall 3 of the convection section l to which the heat exchanger tube group 5 is attached. It is formed. Inside this opening 9, for example, a refractory or fireproof insulation brick (special size brick), a fireproof or fireproof insulation block (castable block), a molded or cored molded product of ceramic fiber, etc. can be used to open the opening 9 from outside the furnace. Corbels 2 configured to be insertable inside are inserted side by side. The tip of this corbel 2 protrudes from the inner surface of the side wall 3 of the convection section 1 and enters between the heat exchanger tubes 6 located at the side ends of the heat exchanger tube group 5, and is used for joining, for example, refractory mortar, castable, refractory bond, etc. It is fixed within the opening 9 by a material 10.

The corbel 2 protrudes from the inner surface of the side wall 3 of the convection section l,
Similar to the conventional method, the gap around each heat exchanger tube 6 installed in the tube bundle 7 in the convection part 1 is made uniform to prevent a short circuit of the combustion gas flowing through the convection part 1. . This corbel 2 has not only a rectangular parallelepiped shape as shown in Fig. 2, but also the thickness of the tip (the side protruding into the convection section l) gradually increasing as shown in Fig. 3(a). It is also possible to use a corbel 2 with a thinner shape, or a corbel 2 with the tip curved in the -L downward direction as shown in (b), to ensure a smoother flow of combustion gas. . Furthermore, the corbels 2 may not all have the same shape, but may be made of irregular shapes to form a row of corbels 2 with no gaps. Also,
Since the corbel 2 is installed by inserting it into the opening 9 from outside the furnace, it can be easily installed after the heat exchanger tube group 5 is installed in the convection section l, especially when fixing the corbel 2 inside the opening 9. Heat exchanger tube group 5 can be fixed by adjusting the position.
This allows the corbel 2 to protrude in the correct position by absorbing a slight positional deviation.

A frame 11 having an L-shaped steel flange is welded to the casing 8 on the outside of the opening 9 outside the furnace. This frame 11 is filled with a filling material 12 such as a heat insulating material such as glass wool or ceramic fiber or a heat insulating material such as a heat insulating board.
is filled to cover the rear surface of the row of corbels 2.

This filler 12 blocks heat that attempts to escape from the gaps between the needle bells 2 or by conducting through the needle bells 2.

Alternatively, without providing the frame 11, an H-shaped cut is made in a portion of the casing 8 corresponding to the opening 9BB, and the casing 8 in that portion is pushed up and down to protrude outward.
This may be used instead of the frame 11.

A cover plate 14 is attached to the flange of the frame 11 by pasting or sandwiching a packing 13 made of, for example, asbestos. This cover plate 14 is made of, for example, an iron plate, an alloy plate, or a non-combustible waterproof cloth, and holds down the filler 12 and, together with the packing 13, provides airtightness to the opening 9 and has a heat insulating effect. It is something that enhances.

In the unimplemented example, the frame 11 is provided and the lid member 14 is attached to the flange of the frame 11, but bolts may be directly welded to the casing 8 or embedded bolts protruding from the outer surface of the side wall 3 may be provided. It is also possible to attach the cover plate 14 with the backing 13 in between using these bolts without providing the frame 11. In this case, it is preferable that the rear end of the corbel 2 be slightly retracted into the opening 9 to create a space for the filler 12.

[Effects of the Invention] According to the present invention, the corbel can be easily attached from outside the furnace after the heat exchanger tube group assembled into the tube bundle is attached to the convection section. After being assembled into a bundle, this integrated heat transfer tube group can be attached to the convection section by dropping or lifting it from the upper or lower part of the convection section. Therefore, the assembly work efficiency is improved compared to the conventional method in which the heat exchanger tubes located at the side ends of the heat exchanger tube group or all the heat exchanger tubes have to be individually attached after the tube bundle is attached. In addition, all return bend welding can be done outside the furnace, making the work easier and improving the reliability of the weld.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a partially sectional perspective view showing the state of formation of a conventional corbel, Fig. 2 is a partially sectional perspective view showing a corbel mounting structure according to the present invention, and Fig. 3 (a ) and (b) are side views showing other embodiments of the corbel. 1: Convection section, 2: Corbel, 3: Side wall, 4: Furnace wall, 5:
Heat exchanger tube group, 6: Heat exchanger tube, 7: Tube bundle, 8: Casing, 9: Open I: 1 part, 10: Bonding agent, ]]: Frame,
12: Filling material, 13: Packing material, 14: Lid plate. Applicant JGC Corporation Agent Yutaka 1) Yoshio Figure 1 Cause 2 No. 31 (Q) (b)

Claims (1)

[Claims] l) In heating equipment such as a tube heating furnace or waste heat boiler that has a group of horizontal heat transfer tubes in the convection section, a kobe that can be inserted from outside the furnace is inserted into the opening formed by penetrating the side wall of the convection section. A corbel mounting structure characterized in that a corbel is inserted and fixed so as to protrude from the inner surface of a side wall of a convection section.