JPH0466604B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a blowing piping line for removing foreign matter from the piping before installing a boiler and starting operation.

With recent changes in the fuel situation, higher power generation efficiency is required in thermal power plants, and one way to achieve this is to construct combined cycle power plants that combine gas turbines and steam turbines. ing. 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 circuit 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 inventor has separately proposed a blowing method that does not require such temporary piping and noise reduction equipment. This method takes into account that a steam bypass line is installed for the condenser of a boiler plant, and allows the blown steam to 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 silencing equipment, and there is an advantage that blowing for scale removal etc. can be carried out not only when the boiler is installed, but also afterwards. 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.

SUMMARY OF THE INVENTION An object of the present invention is to provide a steam blowing piping for a boiler that has a strainer that can effectively remove foreign objects of different sizes that fly away at high speed.

In short, this invention provides that, in piping for blowing boiler piping with steam before installing a boiler and starting operation, a body with a closed end is connected to the steam discharge piping, and the axis of the cylinder is A second cylindrical body with a closed end whose axis intersects with the center is connected to the center, one or more cylindrical porous foreign matter removal tubes are provided in the second cylindrical body, and a side surface of the second cylindrical body and This is a steam blowing lung pipe line for boiler piping, which is characterized by being connected to a condenser.

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 body, one end of which is connected to a steam pipe 2.
The other end is closed by a closing plate 3.
Reference numeral 4 denotes a second cylindrical body that 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. The foreign matter removal plates may be arranged in one stage, but they may also be arranged coaxially in two stages, the primary foreign matter removal plate 5 and the secondary foreign matter removal cylinder 6, as shown in the figure, or in more stages. When arranged in two stages as shown in the figure, the mesh of the primary foreign matter removal cylinder 5 is approximately 5 meshes, and the mesh of the secondary foreign matter removal cylinder 6 is approximately 14 meshes, and the upper and lower ends of each are connected to the second cylindrical body 4. Connect it to the inside wall. 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 10 via a gas exhaust pipe 9.

In the apparatus having this configuration, foreign matter in the system is scattered along with the steam S in the steam pipe 2 due to blowing, 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 having a small mass and a small diameter flows into the second cylindrical body 4 along with the flow of the steam S. Here, foreign matter contained in the steam flow is removed by the primary and secondary foreign matter removal cylinders 5 and 6, and only the steam flows into the condenser 10 via the outlet 8 and the gas discharge pipe 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 tube, so that the foreign object removal tube is not clogged. It is also less likely to be damaged by collisions with large-diameter foreign objects. When a considerable amount of foreign matter has accumulated, 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 cylinder.

FIG. 2 shows another embodiment of the invention.

In the case of this embodiment, the oblique closing plate 1 has a closing plate attached to the rear end of the first cylindrical body 1 and is arranged diagonally.
2, and there is a foreign matter accumulation 1 near this oblique closing plate 12.
form 3. 14 is a closing plate attached to the bottom of the foreign matter reservoir 13.

In this embodiment, since the closing plate is arranged diagonally, the foreign matter that collides with the closing plate is collected in the foreign matter reservoir 13.
The liquid falls towards the water, and there is almost no re-scattering due to the flow of steam. The foreign matter 11 in the foreign matter reservoir 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 tube 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 tube, the foreign object removal tube 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 cylinder, 8... Gas outlet, 11... Foreign matter, 12... Oblique closing plate,
13...Foreign matter accumulation, S...Steam.

Claims (1)

[Claims] 1. In piping for blowing boiler piping with steam after installing a boiler and prior to starting operation, a first cylindrical body with a closed end is connected to the steam discharge pipe, and a shaft is attached to the axis of the cylindrical body. A second cylindrical body with closed ends where the cores intersect is connected, one or more cylindrical porous foreign matter removal tubes are provided in the second cylindrical body, and a conduit is connected between the side surface of the second cylindrical body and the condenser. A steam blowing piping line for boiler piping characterized by being connected.