JPS59154121A - Strainer - Google Patents

Abstract

PURPOSE:To remove efficiently foreign matters having different particle sizes flying in at a high speed by communicating a cylindrical body for removing inertially the foreign matter with a stopping plate provided therein with a cylindrical body provided with a porous foreign matter removing plate at an exhaust port therein. CONSTITUTION:In a waste-heat boiler system, foreign matters in the system flying in a steam pipe 2 with steam S by blowing, flow into the first cylindrical body 1 of a strainer main body. Since a stopping plate 3 is provided to the first cylindrical body 1, foreign matters having large particle sizes and large mass runs straight ahead, strikes against the stopping plate 3, and is deposited in the vicinity of the stopping plate 3. Meanwhile, the foreign matters having small particle sizes and small mass flow into the second cylindrical body 4 together with a steam flow, wherein the foreign matter having small size is removed by porous or reticular foreign matter removing plates 5 and 6 provided at the exhaust port 8 of the second cylindrical body 4. Thus only steam is sent into a steam condenser 10 through a gas exhaust pipe 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a strainer, and particularly to a strainer that can be effectively used when blowing is performed within a waste heat recovery boiler. −Due to recent changes in the fuel situation,
Higher power generation efficiency is also required in thermal power plants, and one of the means to achieve this is the construction of combined power generation plants that combine gas turbines and steam turbines. A combined power generation plant first generates electricity with a gas turbine, then recovers the heat of the waste gas discharged from the gas turbine in a waste heat recovery boiler, and uses the steam generated in the boiler to drive a steam turbine to generate electricity. .

Before installing this waste heat recovery boiler and starting its operation, an operation called blowing out is performed. This blowing out is a process in which the steam generated in the steam generating section of the boiler is raised to a certain pressure, and then the valve is opened to quickly supply it to other pipes to remove foreign objects inside the pipe. . For this reason, piping is temporarily installed in the steam line of the boiler to discharge steam and foreign matter out of the system. However, when the steam is discharged, it makes an extremely loud noise, so an expensive muffling device must be installed, which is uneconomical. For this reason, the inventors have separately proposed a blowing method that does not require such temporary piping and noise reduction equipment. This method is based on the fact that a steam bypass line is installed for the condenser of a boiler plant, so that the blown steam can flow into the condenser through this line and be processed within the system. This is what I did. In this way, there is no need for special piping or a silencer 6, and there is an advantage that blowing for scale removal etc. can be performed not only at the time of installing the boiler but also after that. However, since foreign matter, scale, etc. also flow into the condenser together with the blown steam, it is necessary to arrange a strainer to remove these foreign matter and scale in the middle of the pipe.

Conventional strainers use a mesh-like metal plate with many small holes to remove foreign matter, but there are various sizes of foreign matter that can be removed by blowing. If the mesh is made too large, a large amount of foreign matter will pass through and the strainer will no longer function properly. Furthermore, if large foreign objects fly off, there is a risk of causing major damage.

An object of the present invention is to provide a strainer that can effectively remove foreign objects of different sizes that fly away at high speed.

In short, this invention divides the main body of the device into a part where foreign matter is removed by inertia and a part where foreign matter is removed by a porous or mesh-like foreign matter removal plate. This strainer is configured to remove foreign matter using a foreign matter removal plate.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a first cylindrical body forming a part of the strainer main body, one end of which is connected to a steam pipe 2, and the other end is closed by a closing plate 3. Reference numeral 4 denotes a second m-shaped body which is substantially perpendicular to the cylindrical body 1 and connected in a substantially T-shape.

In this second cylindrical body, a foreign matter removal plate 5 and/or 6, which has a large number of small holes and is formed into a net shape as a whole, is formed in a cylindrical shape so as to be located approximately on the same axis as this second cylindrical part. It is located. This foreign matter removal plate may have one stage, but as shown in the figure, there are 5 primary foreign matter removal plates. In the second stage of the secondary foreign matter removal plate 6,
Alternatively, they may be arranged in more stages. When arranged in two stages as shown in the figure, the mesh size of the primary foreign matter removal plate 5 is, for example, approximately 5 meshes, and the mesh size of the secondary foreign matter removal plate 6 is approximately 14 meshes. A closing plate 7 closes the lower end of the second cylindrical body 4. 8 is a gas exhaust port attached to the side wall of the second cylindrical body 4, and is connected to the condenser 1 through a gas exhaust pipe 9.
7).

In the apparatus having this configuration, foreign matter in the system is blown away along with the steam S through the steam pipe 2 and flows into the first cylindrical body 1 of the strainer body. Among the foreign objects carried by this steam flow, a large foreign object 11 having a large mass moves straight through the first cylindrical body 1 due to inertia, collides with the closing plate 3, and is deposited in the vicinity of this closing plate. On the other hand, foreign matter with small mass and small diameter is steam S.
With the flow of the second cylindrical body 4. flows into.

Here, foreign matter contained in the steam flow is removed by the primary and secondary foreign matter removal plates 5 and 6, and only the steam is discharged from the outlet 8. The gas flows into the condenser 10 via the gas discharge line 9.

As described above, the strainer of the present invention is configured so that large foreign objects are first removed by inertia, and only the remaining small diameter foreign objects are removed using the foreign object removal plate, so that the foreign object removal plate is free from clogging. It is also less likely to be damaged by collisions with large-diameter foreign objects.

When a considerable amount of foreign matter is found, the closing plates 3 and 7 are removed and the accumulated foreign matter is discharged to the outside. In this case, it is of course possible to replace the foreign matter removal plate.

FIG. 2 shows another embodiment of the invention.

In the case of this embodiment, the closing plate attached to the rear end of the first cylindrical body 1 is an oblique closing plate 12 arranged diagonally, and a foreign object portion 13 is formed in the vicinity of this oblique closing plate 12. . 14 is a closing plate attached to the bottom of the foreign matter portion 13.

In this embodiment, since the closing plate is arranged diagonally, the foreign matter that collides with the closing plate falls toward the foreign matter portion 13, and there is almost no re-scattering due to the flow of steam. The foreign object 11 in the foreign object section 13 can be easily taken out by removing the closing plate 14.

By carrying out this invention, large foreign objects are removed in advance by inertia, so the foreign object removal plate is less likely to be clogged, and the period of use of the device can be extended.

Furthermore, since large foreign objects almost never collide with the foreign object removal plate, the foreign object removal plate is less likely to be damaged, and the life of the device itself can be extended.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a strainer showing a first embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view of a strainer showing a second embodiment. 1...First cylindrical body 3...Closing plate 4...Second cylindrical body 5.6... Porous foreign matter removal plate 8... ... Gas outlet 11 ... Foreign matter 12 ... Oblique closing plate 13 ... Foreign matter S ... Steam

Claims (1)

[Claims] 1. A device that removes foreign matter in piping by injecting gas such as steam, which includes a first cylindrical body that removes foreign matter by inertia, and a gas exhaust device connected to the first cylindrical body. A second cylindrical body having an outlet, and a second cylindrical body placed inside the second cylindrical body to cover this gas discharge port! What is claimed is: 1. A strainer comprising: a foreign matter removal plate with perforated holes; 2. A patent claim characterized in that a diagonal closing plate is attached to the end of the first cylindrical body, and the attachment of the skew closing plate forms a foreign matter reservoir in the first cylindrical body near the end. The strainer according to item 1.