JPH0140965Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a continuous blowing device for a boiler for thermal power generation.
This invention relates to a jet shock absorber for a piping system installed downstream of a pressure reducing device such as a turbine bypass system.

Conventionally, continuous blowing equipment for boilers for thermal power generation,
A target plate is provided in the turbine bypass system and the like on the downstream side of the pressure reducing device to prevent erosion caused by jets of steam. The outline is the first
Fig. 1b shows details of section A in Fig. a and Fig. 1a.

In the figure, 08 is a flange, 09 is a gasket, 010 is a blind flange, 020 is a target plate made of stainless steel, etc., 030 is an electric flow rate adjustment valve, 031 is a manual or electric stop valve, 032 is a handle, 033 is a motor, w is the welding point, the first
In figure a, the arrow at the top left shows the steam jet from the boiler drum, and the arrow at the bottom right shows the flow direction to the blowflush tank.

In the target plate system as shown in FIGS. 1a and 1b, the target plate 020 is consumed in a short period of time due to erosion along with the flange pipe 08 and the blind flange 010, depending on the amount of steam blowing, the distance from the pressure reducing device to the target plate, etc. do.

If these defects occur, there is a risk of serious accidents such as steam spewing out from the blind flange of the target section.

The purpose of this invention is to eliminate such troubles and improve the reliability and quality of the boiler.A cartridge is installed inside the pipe downstream of the pressure reducing device to effectively buffer the jet flow, and the pressure behind the cartridge is The novel point is to perform effective and safe steam blowing by monitoring the

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figure 2a shows a cross section showing the configuration, and the second
Figure b is a perspective view of the pressure pipe nozzle, Figure 2c is Figure 2a.
A detailed cross section of part A is shown.

In the figure, main pipe 1, Tee joint 2, branch pipe 3,
The outer cylinder 4 and the outer cylinder flange 8 are shown in FIG. 2a, respectively.
Join by butt welding as shown. A stainless steel cartridge 5 having a hemispherical concave surface R is inserted into the stepped portion of the outer cylinder 4 via a gasket 6.

The cartridge holder 7 is inserted into the outer cylinder 4 and the outer cylinder flange 8, and the blind flange 10 is inserted into the gasket 9.
is tightened to the outer cylinder flange 8 with bolts 11 and nuts 12. At this time, the cartridge 5 and the cartridge holder 7 are pressed against the outer cylinder 4 via the gasket 6, and a space 17 is formed inside the cartridge holder 7.

The pressure pipe nozzle 13 is inserted into the outer cylinder 4 and welded (FIG. 2b). The pressure pipe 14 is inserted into the pressure pipe nozzle 13 and welded, and after the loop 18 is removed, a pressure gauge 16 is attached using the ring joint 15. As shown in FIG. 2a, a pressure hole 19 communicating with the pressure pipe 14 is provided in the cartridge holder 7 and the outer cylinder 4.

Next, the functions and effects of the present invention having the above structure will be described.

The jet flow that has passed through the pressure reducing device etc. is sent from the main pipe 1 through the Tee joint 2 to the cartridge 5 inserted into the outer cylinder 4.
leading to.

The cartridge 5 is made of stainless steel in order to have erosion resistance, and its shape has a concave surface R with a hemispherical cross section where the jet impinges. This is because in past trouble cases, the part of the target plate 020 shown in Figures 1a and 1b along the inner surface of the tube, especially the lower half of the circumference, was selectively worn away, so that the flat plate perpendicular to the jet flow was worn out. This is because it is estimated that the hemispherical concave surface R causes less wear and tear and has a longer life.

The flow buffered and decelerated by the cartridge 5 flows from the branch pipe 3 to a drain reservoir (not shown).

On the other hand, a space 17 surrounded by the cartridge 5 and the cartridge presser 7 is a space 17 between the outer cylinder 4 and the cartridge 5.
Since it is sealed by the gasket 6, it is maintained at atmospheric pressure.

The pressure in the space 17 is always indicated to the pressure gauge 16 through the pressure pipe 14, and if the cartridge 5 is damaged by the jet flow and the flow enters the space 17, the pressure will rise rapidly. The cartridge 5 and cartridge holder 7 can be easily replaced with spare parts by removing the blind flange 10.

Due to the above-mentioned functions, the present invention allows jet flow to be effectively buffered by the cartridge, and the state of damage to the cartridge can be monitored based on the indication from the pressure gauge, and by replacing the cartridge, steam from the target area can be prevented from occurring. It has the effect of preventing leakage.

[Brief explanation of the drawing]

Figure 1 relates to a conventional jet shock absorber, and Figure 1a
is a front view, FIG. 1b is a detailed sectional view of section A in FIG. 1a, FIG. 2 shows the configuration of the present invention, FIG. 2a is a sectional view, and FIG. , FIG. 2c is a detailed sectional view of section A in FIG. 2a. 1... Main pipe, 2... Tee joint, 3... Branch pipe,
4... Outer cylinder, 5... Cartridge, 6, 9... Gasket, 7... Cartridge holder, 8... Outer cylinder flange, 10... Blind flange, 11... Bolt, 12... Nut, 13... Pressure pipe nozzle, 14
...Pressure pipe, 15...Ring joint, 16...
...Pressure gauge, 17...Space, 18...Loop, 19
...Pressure hole.

Claims (1)

[Scope of utility model registration request] 1. A piping-based jet flow buffering device, comprising: a cartridge for colliding a jet flow; a space connected to a pressure gauge; and a cartridge holder behind the cartridge.