JPH0120481Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a baffle structure for preventing drifting that can be applied to boilers having element tubes (heat exchanger tubes) in general.

In the conventional boiler shown in Figure 1, a superheater is installed inside the furnace or flue to exchange heat with the combustion gas.
Element tubes 01 (coal saver tubes 02 + spiral fins 03) for reheaters, economizers, etc. are arranged, but the space between these element tubes 01 and the surrounding wall is usually limited due to layout issues, installation, etc.
The space is wider than the space between the element tubes 01, and the arrangement is such that the combustion gas 05 can easily flow therethrough.

In particular, in economizers, the pitch between tubes is narrow, and the flow resistance between element tube 01 is greater than between element tube 01 and the peripheral wall. There is a large difference in flow path resistance between the curved pipe section and the bent pipe section at the end, which cannot be attached, and the shape is such that high-temperature combustion gas tends to drift particularly easily along the surrounding wall, causing damage to the casing and duct plate under the economizer. Problems such as burnout and gas leakage have occurred.

In existing boilers, casing burnout and gas leakage accidents occur, which are thought to be caused by the drift of high-temperature gas as described above, so the present invention aims to provide a structure that improves these problems.

The present invention provides a uneven flow prevention buttful structure for a boiler in which a buttful plate closes the space between a group of heat exchanger tubes with spiral fins installed in a boiler flue and a flue wall. The pair of heat exchanger tubes are slidably fixed by being extended to the part where the spiral fin is attached, and the pair of heat exchanger tubes are sandwiched between the T bolt whose head portion touches the outer periphery of the spiral fin of the pair of heat exchanger tubes and the buttful plate. The present invention provides a baffle structure for preventing drifting of a boiler, which is characterized by:

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The baffle structure for preventing drifting according to the present invention is shown in Fig. 2.

One end of the buff-full plate 1 abuts against the peripheral wall tube 10 and is supported by the element tube 3 by T-bolts 2.

The T-bolt 2 consists of a head part 4 made of a thin strip or round bar and a bolt part 5 so that it can be dropped between the element tubes 3.The head part 4 is dropped between the element tubes 3 and turned 90 degrees. When you lift it up, it gets caught in element tube 3.

The holes for the T-bolts 2 in the baffle plate 1 are elongated holes or loose holes so as not to restrict thermal expansion, and are fixed with nuts 7 via washers 6.

A stacked plate 8 is installed between each double plate 1,
The gap between the buttful plates 1 is closed to prevent combustion gas from drifting, and care is taken not to restrict thermal expansion.

Further, a reinforcing plate 9 is attached to the stiff plate 1 in order to prevent deformation due to heat as much as possible.

Next, the operation and effects of the present invention with the above configuration will be described.

The T-bolt 2 that fixes the full plate 1 and the element tube 3 has a narrow space between the element tubes 3, so the shape of the bolt head 4 is made from a thin strip or round bar. It consists of a combination of When the head part 4 of the T-bolt 2 is dropped between the element tube 3 and turned 90 degrees and lifted, it is hooked on the element tube 3 and the bolt 2 is screwed into the nut through the hole in the buttful plate 1, thereby welding. It can be fixed without

A stacked plate 8 is attached to the gap between the buttful plates 1 to block the combustion gas 5 from drifting, and a reinforcing plate 9 is attached to the buttful plate 1 to prevent deformation due to heat. can.

As mentioned above, by installing the full plate 1, the part where the combustion gas tends to drift is blocked, so the gas flows uniformly between the element tubes 3, and heat exchange between the element tube 3 and the combustion gas 5 is also possible. It is carried out smoothly and has the effect of preventing accidents such as burnout of the casing and ducts or gas leaks due to uneven flow of high-temperature gas.

Furthermore, by using the T-bolts 2, installation and replacement can be easily performed without welding work.

Next, specific examples will be described with reference to FIGS. 3, 4, and 5.

(a) Back plate 1 and surrounding wall tube 1 during boiler operation
If the gap between 0 and 0 is a problem, attach the bracket 1 fixing hardware 12 to the fins 11 between the surrounding wall tubes 3, and sandwich the ends of the buttful plate 1 to secure the buttful plate 1 and the surrounding wall. This can prevent gaps from forming between the tubes 10 (see Figure 3).

(b) The function of T-bolt 2 will not be impaired even if it is a J-bolt. It is also possible to use U-bolts (see Figures 4a and 4b).

(c) If it is necessary to allow combustion gas to flow between the peripheral wall and the element tube 3, the buttful plate 1 can be made of a perforated plate with appropriate openings (see Figure 5).

[Brief explanation of the drawing]

Figure 1 shows a conventional boiler configuration, Figure 1a is a sectional view showing the outline of the configuration, Figure 1b is a plan view taken along the line A--A in Figure 1a, and Figure 1c is a cross-sectional view showing the outline of the configuration. C in Figure 1 b
-C line arrow front view, Figure 1 d is B-B in Figure 1 a
The side view as seen from the line arrow, Figure 2 and subsequent figures are embodiments of the present invention,
Figure 2a is a plan view showing the mounting of the full plate;
Figure 2 b is a front view, Figure 2 c is a side view, Figure 2 d
is a perspective view of a T-bolt, Figure 3 and the following are other examples, Figure 3 is a front view of a full plate installation, Figure 4a is a side view of an example installed with a J-bolt, and Figure 4b is a U-bolt. FIG. 5 is a side view of an example in which it is attached with bolts, and a perspective view of an example in which a perforated plate is used. 1...Bassful plate, 2...T bolt, 3
...Element tube, 4...T-bolt head, 5...T-bolt part, 6...Washer,
7...Nut, 8...Stacked plate, 9...Reinforcement plate, 10...Surrounding wall tube, 11...Fin, 12...
Fixing hardware.

Claims (1)

[Scope of utility model registration request] Between the group of heat exchanger tubes with spiral fins installed in the boiler flue and the flue wall: In the boiler's uneven flow prevention buff-full structure, which is blocked by a buff-full plate,
The ends of the buttful plates are arranged to extend to the part where the spiral fins are attached, and the pair of heat transfer tubes are connected to the T-bolts having head portions in contact with the outer periphery of the spiral fins of the pair of heat transfer tubes. The boiler's uneven flow prevention feature is characterized by a heat pipe that is sandwiched and fixed in a slidable manner.