JPS59197707A - Furnace bottom structure - 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] An ascending furnace (hereinafter referred to as a ``spiral furnace'').

) is related to the bottom structure of a boiler.

There are two types of conventional spiral furnace bottoms: an inclined bottom, in which the inclination a of the peripheral wall and the bottom angle α are the same, as shown in FIGS. 1 and 2, and a full bottom, as shown in FIGS. 3 to 6.

Inclined bottom is ■ The height of the furnace increases by the bottom of the furnace, making it uneconomical.

■ There is a large imbalance in tube length in the furnace.

There's a problem. 2 ~ Inclined bottom shape to the current Furano topotom for drainage of water inside the furnace.
If the slope is 3°, it is inconvenient that there will be some areas where canned water cannot drain out of the bottom tube when the boiler is stopped.

Kisho-mei was created in view of the above, and in boilers with a spiral furnace, the line where the nozzle header exiting the furnace inlet header and the furnace bottom are in contact is located at a lower position than the line where the furnace bottom and the furnace peripheral wall are in contact. To provide a hearth bottom structure characterized by being formed as follows.

By configuring the furnace bottom as described above, the drain water during furnace flushing can collect at the lowest position along the slope of the furnace bottom and be discharged, and canned water in the pipes that make up the furnace bottom can also be discharged. Easily discharged when stopped.

A first embodiment of the present invention will be described below with reference to FIGS. 7 to 10.

This example shows a flat bottom construction with drain draft according to the present invention for an eight corner case.

In the figure, the line where the nozzle header (2) protruding from the furnace inlet header (1) touches the furnace bottom (3) is a b. Hearth bottom (3)
□-d-e-f-
Let it be c. II-b c-d c I' c yo p
If placed at a level 200-300 mm below, the tube axis of the furnace bottom tube (5) always slopes downward from the furnace peripheral wall (4) to the nozzle stand (2) in the tube arrangement shown in Figure 1. Drain during this sump furnace flushing passes over the fins (6) and is collected in the line ab, and is easily discharged outside the boiler by providing a drain discharge hole in this area.

Moreover, when the boiler is stopped, canned water in the furnace bottom tube (5) is also easily discharged to the furnace inlet header (1) for the same reason.

Next, a second embodiment of the present invention will be described based on FIGS. 11 to 14.

This example shows a flat bottom construction with drain draft according to the present invention for a four corner case.

In the figure, the line where the nozzle stand (8) protruding from the furnace front/rear wall inlet header (7) touches the furnace bottom (9) is designated as g-11. Furnace side wall inlet header o1'), θ]) 0 headers protruding from the side, α
The line where → is in contact with the hearth bottom (9) is i-g −, i, k
Let it be h-i. Also, the line where the furnace bottom (9) and the furnace peripheral wall 04) are in contact is defined as m11- +l -p ''-Ill. i -k, , i -1 is defined as l1ln o -p
--m at a level 100-150mm below, and g-h at i- and 1.00-150mm below j-1, the tube arrangement shown in the figure can be arranged and the furnace bottom The tube axis of tube 00 is always in the direction of the furnace peripheral wall θΦ and the tube stand (8), α
It becomes a downward slope to gong and α rise. Therefore, during furnace flushing, the condensate passes over the fin Oe and is collected on the line g-11,
By installing a drain discharge hole in this part, the drain can be easily discharged to the boiler. In addition, when the boiler is stopped, canned water in the furnace bottom tube θυ is easily drained into the furnace front and rear wall inlet headers (7) and the furnace side wall inlet header 00 for the same reason. It is discharged at θ.

As described above, according to the present invention, even in a flat bottom structure, it is easy to drain the drain during furnace flushing, and at the same time, it is also easy to discharge canned water in the furnace bottom tube when the boiler is stopped.

[Brief explanation of the drawing]

Figure 1 is a side view showing the inclined bottom. Figure 2 is a view taken along the arrow A-A in Figure 1, Figure 3 is a side view showing the flat bottom with 8 corners, Figure 4 is a view taken along the E-B arrow in Figure 3, and Figure 5 is the 4-corner side view. 6 is a side view showing the flat bottom of FIG. 5, FIG. 7 is a side view showing the first embodiment of the present invention, and FIG. Arrow view. Figure 9 is an E-E arrow view in Figure 7, Figure 10 is F in Figure 8.
-F arrow view, FIG. 11 is a side view showing the second embodiment of the present invention, FIG. 12 is a G-C arrow view in FIG. 11, and FIG. 13 is H-, H arrow view in FIG. View, Figure 14 is 1-1 in Figure 12
It is an arrow view. (1) Furnace inlet header, (2) (8) αno 0
@...Kandai. (3)・(9)・Furnace bottom, (4)・(1Φ・Furnace peripheral wall, (5)・α・Furnace bottom tube, (6)・OQ・Fin, (7)・・Furnace front/rear wall inlet header, 00・0υ・
・Furnace surrounding wall inlet pipe header. Figure 1 Figure 3 Figure 5 Figure 2 Figure 4 Box 6 Figure 4 Figure 7 Figure 8 Figure q Seki No. 107 Figure 11 Figure 12 Order @ Figure 13 Figure 147 Incident display Hearth structure correction Patent Applicant Address: 5-5 Marunouchi Sara-chome, Chiyoguchi J-ku, Tokyo, January Name (620) Mitsubishi Heavy Industries, Ltd. Address: 5-1 Marunouchi Sara-chome, Chiyoguchi J-ku, Tokyo Bow fl) "Furnace peripheral wall inlet header" on page 6, line 6 of the specification is referred to as "furnace side wall inlet header." (2) Replace the drawing Medium Temperature Figure 8 with attached sheet Figure 8 (there are no corrections in Figures 7, 9, and 10). Figure 9 Figure 10

Claims (1)

[Claims] A boiler having a spiral furnace, characterized in that the line where the nozzle header exiting the furnace inlet header contacts the bottom of the furnace is formed at a lower position than the line where the bottom of the furnace contacts the peripheral wall of the furnace. structure.