JPS63247503A - Conical type double tube once-through boiler - 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 The present invention relates to a conical double-tube once-through boiler in which a smoke tube passes through each of the water tubes arranged in a conical manner between the upper and lower headers provided in a vertical cylindrical furnace cylinder. It is.

In general, vertical cylindrical once-through boilers have a box-shaped ring shape with upper and lower headers made of flat plates, and both ends are heated and welded water pipes are often arranged vertically in an arc shape. There is resistance to flow, and ■Material costs are expensive.

The present invention has been devised to eliminate this drawback. Its structure will be explained with reference to the drawings.

A downward burner (3) is attached to the center of the upper lid (2) of the vertical cylindrical furnace tube (1), and annular upper and lower headers (4) and (5) are installed inside the furnace tube (1). The outer diameter of the header (4) is made smaller than the outer diameter of the lower header (5), and a gap (6) is maintained between it and the inner wall of the furnace tube (1).
) are arranged in an arc shape at equal intervals, and the upper end of the flue pipe (8) that passes through the center of each water pipe (7) is protruded and welded to the upper surface of the upper pipe header (4), and the lower end is welded to the lower pipe header (5). Weld the protrusion to
A steam/water outlet pipe (9), a safety valve (10), a pressure gauge (11), etc. are installed on the upper surface of the upper header (4), and then the lower header (5) is installed.
Connect the chimney stand (14) to the downpipe (12), drain pipe (13), water supply port (14), etc. below the
7)). ■When the downward burner (3) is ignited, the flame hits the hearth bottom (18) and the surrounding water pipes (7)
It passes through the gap, ascends along the inner wall of the furnace tube (1), passes through the gap (6), descends from the upper surface of the upper pipe header (4) into each flue pipe (8), and rises to the lower pipe header ( 5) Bottom flue (15
) and is discharged from the chimney stand (16) to the chimney (19).

In addition, a steam and moisture device (19) is attached to the upper outside of the furnace tube (1), and the steam and water blow-off pipe (9) is eccentrically connected, with a steam blow-off pipe (20) above and a downcomer pipe (12) below. They were connected, a water level gauge (21) was attached to the front, and water was held at the A-A position. This is a circular fibrous double-tube once-through boiler.

Since the present invention has the above structure, in the state shown in FIG. 1, when the burner is ignited, the flame spreads out and spreads to the surrounding water pipes, collides with the bottom of the furnace, and hits the surroundings. It spreads through the gap between the water pipes, rises along the inner wall of the furnace cylinder, and passes through the gap (6) while contacting the outer surface of the water pipe.
Water is heated in the water pipe as it descends through the flue from the top of the upper header, passes through the flue under the lower header, is discharged into the chimney, and the newly heated water is A-A. The water vaporizes on the water surface, eccentrically flows into the steam and water jet from the upper steam and water blow-off pipe, performs steam and water, and is sent from the upper steam pipe and separated. flows into the lower header, increasing the amount of steam ejected.
It supplies water at the same time and maintains the A-A water level. The conical shape of the water tube makes the flame flow smoother, the double tube increases the heat transfer rate, and the 3-pass combustion has the excellent effect of maximizing thermal efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a vertical sectional view of the body, showing the flow of flame and the water level. Figure 2 is a cross-sectional view taken along line B-B in Figure 1.

Claims (1)

[Claims] A downward burner (3) is attached to the center of the upper cover (2) of the vertical cylindrical furnace tube (1), and annular upper and lower headers (4) and (5) are provided inside the furnace tube (1). The outer part of the upper header (4) is made slightly smaller than the outer part of the lower header (5), and a gap (6) is maintained between it and the inner wall of the furnace tube (1).
5), the water pipes (7) are arranged in a slightly inclined arc shape at equal intervals, and the upper end of the smoke pipe (8) passing through the center of each water pipe (7) is connected to the upper pipe head ( 4) are welded protrudingly on the upper surface, the lower end is welded protrudingly on the lower surface of the lower header (5), and the upper surface of the upper header (4) is equipped with an air/water outlet pipe (9), a safety valve (10), and a pressure gauge, respectively. (11) etc. are attached, and the lower pipe stopper (5) is installed.
On the lower side are the downpipe (12), drain pipe (13), and water supply port (
14) etc., connect the chimney stand (16) to the flue (15) provided under the pipe of the lower pipe header (5), and install the chimney (16) above.
17), and the flame of the downward burner (3) reaches the bottom of the hearth (18
), passing through the space between the surrounding water pipes (7) and colliding with the furnace tube (
1), passes through the gap (6), descends from the upper surface of the upper pipe header (4) into each flue pipe (18), and enters the flue (15) on the lower surface of the lower pipe header (5). ) through the chimney (17)
A conical double-tube once-through boiler that is characterized by its discharge.