JPS6391494A - Device for supporting heat exchanger - Google Patents

Abstract

PURPOSE:To prevent a fluid at a clamping part and an inserting part of a heat transfer pipe from leaking and to safely support the weight of the heat exchanger by constituting the supporting device of a support beam encircled by a heat duct and heated by a heating fluid, a support base fixed through the lower wall of the heating duct and provided at its lower surface with a slide material, a frame beam supporting the support base and a frame column supporting the frame beam. CONSTITUTION:The total weight of a heat transfer pipe 1, an upper tubular plate 3, a lower tubular plate 2, a casing 4 and the like, in operation is transmitted to a newly provided support beam 11 clamped by a bolt 6 or welded. On the other hand, a heating duct 15 encircling the support beam 11 is formed at a part of the casing 4, and a heating fluid 9 is introduced thereto and the support beam 11 is heated. Thus, the above described total weight is transmitted to a support base 12 fixed through the lower wall of the heating duct 15, and the support base 12 is supported by the frame beam 5 which is supported by the frame column 8. At the intermediate between the support base 12 and said frame beam 5 a slide material 26 is provided, and absorbs the thermal expansion difference between the support base 12 and the frame beam 5.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a support device for a heat exchanger, and in particular to a suitable heat exchanger for solving problems caused by thermal stress between a heat exchanger body and a steel frame support frame. The present invention relates to a device for supporting a vessel.

[Conventional technology]

The conventional technology is shown in Fig. 10, a side view of a steel pipe heat exchanger, and Fig. 1.
This will be explained with reference to the partial detailed diagram of FIG.

In FIG. 10, the heat exchanger tube 1 is inserted into the lower tube sheet 2 and the upper tube sheet 3 by welding or tube expansion, and the load is transmitted to the pedestal beam 5 through the lower tube sheet 2, and then to the pedestal column 8.
can be conveyed to. The lower tube plate 2 and the pedestal beam 5 are fastened together with bolts and nuts 6. A heating fluid (e.g. boiler exhaust gas) 9 conducts heat from the outside of the heat exchanger tubes through a body whose outer peripheries are surrounded by a casing 4 of a lower tube sheet 2 and an upper tube sheet 3. A fluid to be heated (for example, by-product gas generated from a blast furnace, coke oven, or converter in a steel mill) 10 is introduced from an inlet duct 7, passes through a heat transfer tube, absorbs heat from a heating fluid 9, and increases its temperature. Flows upward and is led out of the heat exchanger body from the upper part of the upper tube sheet 3, and is supplied to the boiler. FIG. 11 shows details of how the lower tube plate 2 and the frame beam 5 are bolted together. The bolt through holes in the lower tube sheet 2 are made into elliptical holes with a longer diameter in the direction of thermal expansion, so that the structure absorbs the difference in thermal expansion between the lower tube sheet 2 and the frame beam 5.

Next, regarding the bottom support method of steel pipe heat exchangers,
This will be explained with reference to FIGS. 12 and 13.

In Fig. 12, the lower tube plate 2, which supports the weight of the heat exchanger tubes 1 arranged vertically, is fastened to the frame beam 5 by bolts 6 at the flange portion, and furthermore, the lower tube plate 2 is A plurality of reinforcing plates 35 are attached to the reinforcing plates 35, and a plurality of reinforcing beams 36 bridging between the reinforcing plates 35 and the pedestal beam 5 in a direction perpendicular to the reinforcing plates 35 are fastened with bolts 37 to transmit the load to the pedestal column 8.

Here, at each fastening portion of the bolts 6 and 37, the lower tube sheet 2 is heated to the temperature of the heating fluid 9, and the pedestal beam 5 is cooled to atmospheric temperature. In addition, since the reinforcing plate 35 and the reinforcing beam 36 are heated to the temperature of the heated fluid 10, each member expands thermally, so the center of each bolt through hole needs to be the base point of elongation. Although the hole is a perfect circular hole, the end portion is a horizontally elongated elliptical hole to absorb the difference in thermal expansion.

[Problem that the invention seeks to solve]

The conventional technology does not take into consideration the temperature difference between the upper flange portion and the lower flange portion of the lower tube plate and the pedestal beam.
That is, the lower tube plate and the upper flange of the pedestal beam are heated to the heated fluid temperature, and the lower flange of the pedestal beam is cooled to ambient temperature.

A temperature difference occurs, causing the frame beam to warp. For this reason, even though the mounting bolt holes in the lower tube plate are oval holes, there are problems in which the lower tube plate cannot slide and is bent, or the bolts break and cause fluid leakage at the fastening section. Ta.

Next, even in the bottom support method, since the reinforcing plate and reinforcing beam provided below the lower tube sheet are large in size, the inflow cross-sectional area of the fluid to be heated decreases and a drift occurs. In addition, if the number of reinforcing plates is limited for the above reason, there are problems such as local dents in the lower tube plate, damage to the heat exchanger tube insertion part, and convection between the heating fluid and the heated fluid. Ta.

The present invention prevents fluid leakage at the connection portion between the lower tube sheet and the pedestal beam or the insertion portion of the heat transfer tube, and safely supports the weight without restricting the horizontal thermal expansion of the lower tube sheet. An object of the present invention is to provide a support device for a heat exchanger.

[Means for solving problems]

The present invention provides a support beam provided between the lower tube plate, the support stand, and the pedestal beam, surrounded by the heating duct, and heated by the heating fluid, and fixed via the lower wall of the heating duct,
A support stand with a sliding material provided on the lower surface, and a pedestal beam that supports this support stand.

It consists of a trestle column that supports a trestle beam.

[Effect]

Since the upper and lower flanges of the support beam are both housed in the heating duct and heated by the heating fluid, there is no temperature difference between the upper and lower parts, and the temperature is the same as that of the lower tube sheet without causing warpage. , the horizontal thermal expansion of the lower tube sheet is no longer restricted. On the other hand, the weight of the heat exchanger main body is transferred to a support base fixed to the lower part of the heating duct and provided with a slide member on the lower surface, and is supported by a frame beam and a frame column located at the bottom of the support base, but the slide member As a result, the difference in thermal expansion between the support base and the frame beam is absorbed, and the weight is safely supported.

〔Example〕

A first embodiment of the present invention will be described with reference to FIGS. 1 and 2. In FIG. 1, one end of a plurality of heat transfer tubes 1 is inserted into an upper tube sheet 3, the other end is inserted into a lower tube sheet 2 separated from the upper tube sheet, and a casing 4 is inserted between the tube sheets. a main body for introducing heating fluid (e.g., boiler exhaust gas) 9;
For example, in a heat exchanger consisting of an inlet duct 7 that introduces by-product gas (generated from a blast furnace, coke oven, and converter in a steel mill) 10, the heated fluid 10 is transferred from the outside of the heat transfer tube 1 to the heating fluid 9. It rises inside the heat exchanger tube 1 while absorbing heat, reaches the upper part of the upper tube plate 3, and is discharged to the outside of the heat exchanger. Heat exchanger tube during operation1. The total weight of the upper tube sheet 3, the lower tube sheet 2, the gasket 4, etc. is transferred to the newly installed support beam 11, which is fastened or welded with bolts 6 at the flange portion of the lower tube sheet 2. On the other hand, a heating duct 15 surrounding this support beam 11 is formed in a part of the casing 4, heating fluid 9 is introduced, and the support beam 11 is heated.

The entire weight is then transferred via the lower wall of the heating duct 15 to a fixed support base 12, which support base 12 is supported by the frame beam 5, which in turn is supported by the frame column 8. A slide member 26 is provided between the support base 12 and the pedestal beam 5 to absorb the difference in thermal expansion between the support base 12 and the pedestal beam 5.

Figure 3 is a flue duct system diagram employing a typical balanced ventilation system for a boiler equipped with a heat exchanger.

The combustion air in the air duct 41 is pressurized by the built-in fan 42 and heated by the exhaust gas passing through the exhaust gas duct 44 in the air preheater 43 before being supplied to the boiler 45 . On the other hand, the exhaust gas of about 300°C burned in the boiler 45 flows to the heat exchanger 47 via the branch duct 46, and preheats the by-product gas 10 of about 40°C to 180°C to 200°C.

This heated by-product gas 10 is supplied to the boiler 45,
The exhaust gas passes through the dust collector 48, is pressurized by the induced draft fan 49, and is released into the atmosphere. According to the configuration of the present invention, the difference in thermal expansion between the heat exchanger body and the support device in this plant is It can absorb and safely support full weight.

A second embodiment of the present invention will be described with reference to FIG.
In this case, the heating fluid is divided into the heating duct 15.
The water flows in through the inlet pipe 13 provided at the top, heats the support beam 11, and is exhausted through the outlet pipe 14. According to this embodiment, surplus heat sources of other devices can be used, and energy can be used effectively.

A third embodiment of the present invention will be described with reference to FIG. 1. According to this embodiment, the heat exchanger can be packaged. That is, by providing the heating duct 15, there is no direct construction interference between the lower tube sheet 2 and the pedestal beam 5, and the heat exchanger tube 1, upper tube sheet 3, and lower tube sheet 2, a support base having a casing 4, a support beam 11, and a slide member 26], 2 can be assembled as one body. By assembling the pedestal beam 5 on the top of the pedestal column 8 in advance at the installation site, it is only necessary to install the heat exchanger package assembled at the factory, eliminating the need for on-site assembly of the heat exchanger body and allowing for on-site installation. The period can be shortened.

A fourth embodiment of the present invention will be described with reference to FIGS. 5, 6, and 7.

In a bottom support type heat exchanger, the lower tube plate 2
Because the high-temperature heating fluid 9 and the low-temperature heated fluid 10 flow in between the tube plate 2 and the support beam 11, the temperatures of the lower tube plate 2 and the support beam 11 may not be exactly the same depending on the transient state of operation, etc. Similarly, a difference in thermal expansion is expected to occur between the frame beam 5 and the frame beam 5.

It is necessary to reinforce this difference in expansion without restricting it, so several spacer bars 24 are installed in a grid pattern in the left-right and front-back directions below the lower tube sheet 2 to prevent the lower tube sheet 2 from sagging. , several support plates 25 are installed between this and the support beam 11 perpendicular to the support beam 11 to reduce the load sharing per plate, and by making the load transmission contact surface a point contact, sliding is reduced. It's easy.

According to this embodiment, the lower reinforcing structure of the lower tube plate 2 is simplified, the cross section of the flow path of the heated fluid 10 in the inlet duct 7 is wide, and no drift occurs. In addition, it is possible to increase the number of support points, prevent the lower tube sheet from sagging, and heat transfer tube 1
No damage will occur to the insertion part.

A fifth embodiment of the present invention will be described with reference to FIGS. 8 and 9. The lower tube plate 2 of the fourth embodiment is attached to a spacer bar 24.
In this structure, the support plate 27 is inserted between the support steels 28 attached to the left and right sides of the support beam 11 and fastened with bolts 29. This bolt hole is for support beam 1
It has an elliptical hole structure that can absorb the difference in thermal expansion with 1.

〔Effect of the invention〕

According to the present invention, the support beam that is fastened to the lower tube sheet and supports the weight is heated by the heating duct to the same temperature as the lower tube sheet, so that the fastening portion and the lower tube sheet themselves are free from strain due to the difference in thermal expansion. Since no thermal stress is generated, the fastening portion or the insertion portion of the heat exchanger tube will not be damaged, and fluid leakage will be eliminated. On the other hand, the weight is transmitted from the support beam to the support base, but the slide material attached to the bottom of the support base also absorbs the difference in thermal expansion between the support base and the pedestal beam that supports the support base. It can be operated safely without any problems whether it is stopped or in normal operation.

[Brief explanation of the drawing]

Figure 1 is an overall side view according to the present invention, and Figure 2 is A of Figure 1.
3 is a diagram of a smoke duct system employing a typical flat draft method for a boiler equipped with a heat exchanger, and FIG. 4 is a side view showing a second embodiment of the present invention. FIG. 5 is a side view showing the fourth embodiment of the present invention, FIG. 6 is a view taken along the line A-A in FIG. 5, FIG. 7 is a detailed view of section C in FIG. A side view showing the fifth embodiment, FIG. 9 is a detailed view of the D section in FIG. 8, and FIG.
The figure is a side view showing a conventional example, Fig. 11 is a detailed part of E part in Fig. 10, Fig. 12 is a side view of a conventional bottom support system, and Fig. 13 is a view taken from arrow B-13 in Fig. 12. It is. DESCRIPTION OF SYMBOLS 1... Heat exchanger tube, 2... Lower tube sheet, 3... Upper tube sheet, 4... Casing, 5... Frame beam, 7... Inlet duct, 8... Frame column, 9... Heating fluid (exhaust gas), 10... Fluid to be heated (by-product gas), 11... Support beam. 12... Support stand, 15... Heating duct, 26...
Slide material.

Claims (1)

[Claims] One end of the plurality of heat transfer tubes is inserted into an upper tube sheet, the other end is inserted into a lower tube sheet spaced apart from the upper tube sheet, a casing surrounds the upper and lower tube sheets, and heating fluid is introduced. A heat exchanger consisting of a main body that connects to the lower tube plate and an inlet duct that introduces the heated fluid into the heat transfer tube is provided with a pedestal beam that supports the lower tube plate and a pedestal column that supports the pedestal beam. In the support device for a heat exchanger, the lower tube plate is supported and fixed in the heating duct, and the support beam heated by the heating fluid is connected to the heating duct through the lower wall of the heating duct. A heat exchanger comprising a support fixed to a lower part, a pedestal beam supporting the support pedestal, and a pedestal column supporting the pedestal beam, and having a sliding member between the support pedestal and the pedestal beam. Support device for the vessel.