JPS58136901A - Water tube type steam generator - 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 water tube steam generator having a helical tube furnace wall consisting of a group of tubes inclined with respect to the horizontal, and having a large number of openings in the furnace wall. be.

Generally, water tube steam generators have the following features as shown in Figure 1:
Helical tube furnace wall 1 consisting of a group of tubes inclined with respect to the horizontal
The helical tube furnace wall 1 has a large number of openings such as a burner 3 and an over air boat 4, and a wind box 5. It is a shrine to

The conventional helical tube furnace wall 1 has a helical tube attached to the second
As shown in the figure, since they are arranged on the plane of the furnace wall 1, the helical tubes 16-20, 26-30 have two or more continuous openings, and the helical tubes 11-15, 21-25. There are some that do not go back through the opening at all. The helical tube that passes through the opening in the furnace wall 1 is bent into a semicircular arc at that point, so there is a pressure loss at the bend and an increase in pressure loss due to the length of the tube being longer than at other points. Pressure loss increases. In this way, the pressure loss of the circular part of the helical pipe that passes through the opening in the furnace wall is large, so if there is a difference in the number of points that pass through the opening between the helical pipes, the flow rate will be inversely proportional to the pressure loss of the internal fluid. There will be a difference in the amount of heat absorbed.

The present invention provides a boiler having a helical tube furnace wall in which not only a specific helical tube passes through the furnace wall opening such as a viewing window for inspecting the burner or the inside of the furnace, but all helical tubes pass approximately equally. The purpose is to provide water tube type steam generators such as the following.

For this reason, the present invention bends a part of the helical tube that has once passed through the opening of the helical tube furnace wall outward from the plane of the furnace wall to change the arrangement of the helical tube, and then bends it outward. The pipe is returned to the plane of the furnace wall to match the inclination angle of the other helical pipes.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 6.

6 to 5 show a first embodiment of the present invention;
The figure also shows the second embodiment.

In FIG. 5, 11 to 50 are helical tubes. That is, the helical tubes 11-15 and 21-25 are bent outward from the plane of the furnace wall and diagonally upward at appropriate positions on the furnace wall, as shown in FIG. The helical tubes 16 to 20 and 26 to 60 are arranged at these empty positions at slightly different angles on the plane of the furnace wall, and the furnace wall is constructed by matching the rising angle of the other helical tubes at appropriate positions. On the other hand, the helical tube bent outward from the plane of the furnace wall is bent back to the plane of the furnace wall at an appropriate position to match the rising angle of the other helical tubes to form the helical tube furnace wall 1. Note that FIG. 5 is a plan view taken along the arrow line A-A in FIG. 4.

FIG. 6 is shown corresponding to FIG. 5, and there is no essential difference from the case shown in FIG. 5, except for the shape of the bent portion of the helical tube.

As shown in FIGS. 3 to 6, by replacing the arrangement of some of the tubes in the helical tube group, helical tubes 11 to 60
all pass through the opening in the furnace wall 1 once,
The pressure loss of the internal fluid can be equalized. In this way, by freely adjusting the number of times the helical tube passes through the opening in the furnace wall 1, the pressure loss of the internal fluid can be equalized, and the flow rate of the internal fluid in all the helical tubes can be made equal.

Therefore, according to the present invention, even if a large number of openings are arranged in the helical tube furnace wall, the number of times that all the helical tubes pass through the openings in the furnace wall is approximately equal. The number of cycles is the same, and the pipe pressure loss of the internal fluid is almost the same as that of the brass pipe, so the flow rate of the fluid in the pipe is also the same, and in the state where the pipe receives condensation from the flame and high-temperature combustion gas in the furnace. The wall temperatures become equal.

[Brief explanation of the drawing]

Figure 1 is a side view schematically showing the water tube type steam generator, Figure 2
The figure is a front view showing a conventional helical tube furnace wall, Figure 3 is a front view of the first embodiment of the present invention corresponding to Figure 2, and Figure 4 shows a part of Figure 6. Enlarged front view, No. 5
This figure is a plan view taken along the arrow line A--A in FIG. 4, and FIG. 6 is a plan view of a second embodiment of the present invention shown in correspondence with FIG. 5. 1...Helical tube furnace wall, 2...Vertical tube furnace wall, 3
... Burner (opening), 4... Over air port (opening), 5... Wind box, 11-30... Helical tube.

Claims (1)

[Claims] 1. In a water tube steam generator that has a helical tube furnace wall consisting of a group of tubes inclined with respect to the horizontal, and has a large number of openings in the furnace wall, one of the tubes that has passed through the opening once. The bent part is bent out of the plane of the furnace wall to change the arrangement of the helical tubes, and the bent tube is returned to the plane of the furnace wall to change the inclination of the other helical tubes. A water tube steam generator characterized in that the tubes are arranged so that the heat absorption amount and pressure loss of the tubes are approximately equal according to the angle.