JPH025201Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a multi-tube once-through boiler having a structure in which a large number of water pipes are connected between upper and lower headers.

In a multi-tubular once-through boiler with this type of structure, the steam taken out from the upper header is passed through a separator (steam water separator).
It is customary to have a structure in which steam and water are separated into steam and water in the separator, and in this case, conventionally, part of the separated water stored in the separator is released as blow water. The structure was such that the remaining separated water could be directly returned to the boiler body.

However, this conventional multi-tubular once-through boiler
If a large amount of separated water is recirculated to the boiler body, it becomes similar to a circulation boiler even though it is a once-through boiler, and in some cases it is used in a manner that does not meet the once-through boiler standards. There is a risk that this may occur.

The present invention was developed in view of the above-mentioned problems in multi-tube once-through boilers of conventional structure. Separated water separated by a separator is led to a deaerator, where it is mixed with feed water, and then the boiler body This feature is characterized in that the separated water is allowed to flow back to the boiler, thereby preventing the separated water from flowing directly back to the boiler body.

Hereinafter, the first embodiment shown in FIG. 1 and the second embodiment shown in FIG. 2 of the multi-tube water tube boiler of the present invention will be explained. In the first embodiment shown in FIG. 2 and a lower header 3, the boiler main body is formed by connecting a large number of water pipes 4, and the reference numeral 5 indicates a burner.

Steam generated in the boiler body 1 is led to a cyclone-type separator 6 through a steam pipe 19, and in the separator 6 steam S (dryness 98%
above) and separated water X.

A part of this separated water X is used as blow water in the pipe 2.
5 and valve 26, and the remaining separated water X is sent directly to deaerator 7 through pipe 21, trap 22 and control valve 23.

On the other hand, the water supply Y supplied through the water supply pipe 10 passes through the softener 9, recovers heat from the blow water in the heat exchanger 8, and is then transferred to the deaerator 7 by the water sprinkler 12.
Water is sprinkled inside the tank, and dissolved oxygen, CO ₁ , etc. are separated there. This feed water Y is preheated when passing through the heat exchange coil 11 in the deaerator 7, thereby enhancing the air separation effect. Gas A separated in the deaerator 7 is released from the deaerator pipe 30.

Mixed water Z, which is created by mixing separated water It is supplied to the boiler main body 1. Pipe 1 is installed in the lower header 3 of the boiler body 1.
7, a water level gauge 18 is attached. The control valve 16 is controlled to open and close by a signal from the water level gauge 18, and acts to maintain the water level within the boiler body 1 at a constant level. Also, separator 6
A water level gauge 24 is also attached to the separator 6, and this water level gauge 24 controls the opening and closing of the control valve 23 according to the water level in the separator 6, and functions to maintain the water level in the separator 6 at a constant level.

The second embodiment shown in FIG. 2 differs from the first embodiment only in that an ejector pump 29 is used to mix separated water X and feed water Y. This is similar to that of the first embodiment.

In the present invention, the multi-tubular once-through boiler has separated water in the separator 6, as shown in each of the above embodiments.
The boiler body 1 is mixed with the feed water Y in the deaerator 7 without being directly circulated to the boiler body 1.
Because once-through boilers with a conventional structure are used, there is no risk of misuse in a method that approximates a once-through boiler, and the method ensures that once-through boiler standards are met at any site where it is used. It has the effect of being used in

[Brief explanation of the drawing]

1 and 2 are structural diagrams of a multi-tubular once-through boiler according to an embodiment of the present invention, respectively. 1...Boiler body, 2...Upper header, 3...Lower header, 4...Water pipe, 6...Separator, 7...
Deaerator.

Claims (1)

[Scope of utility model registration request] A boiler main body 1 is constructed by connecting the upper and lower headers 2 and 3 with a large number of water pipes 4, 4, etc., and water is supplied to the boiler main body 1 via a deaerator 7. On the other hand, it is a multi-tube once-through boiler in which steam generated in the boiler main body 1 is guided to a separator 6 and separated into steam and separated water in the separator 6, and the separated water is passed through the deaerator 7 to the feed water. A multi-tube once-through boiler, characterized in that the mixture is mixed with the water and then refluxed to the boiler body 1.