JPH0849805A - Boiler having a plurality of steam separaters - Google Patents

Abstract

PURPOSE:To keep a water level in a boiler at a high level and prevent carry- over or water tube overheating, produced due to difference between the thermal loads of water tubes, by a method wherein steam, consisting of mixed air and liquid, is introduced into a first air/water separater at first to remove a part of boiled water by the first steam separater, then, the steam is introduced into a second steam separater to remove boiled water further. CONSTITUTION:The steam separation of first time is effected in a first steam separator 5 and separated boiling water is returned into a lower header 2 through a water descending tube 9 while boiling water, not separated from steam, is sent into a second steam separator 6 from the first steam separator 5 through a second communicating tube 8. Steam separation is effected again in the second steam separator 6 and separated boiling water is returned to the lower header 2 through the water descending tube 9 while only steam is taken out of a steam tube 10. The occurrence of carry-over can be prevented even when the boiling water is increased and the water level of a boiler is higher than a usual level by providing the steam separators doubly whereby overheating in a water tube far from a burner 4 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiler having a plurality of steam separators for heating a group of water tubes from the side.

[0002]

2. Description of the Related Art In the case of a multi-tube once-through boiler, the water level in the water pipe is up to the middle of the water pipe, and overheating of the upper part of the water pipe is prevented by boiling up boiling water generated when the water pipe is heated. When the steam is taken out, the boiling water is taken out together with the steam, but a steam separator for removing the boiling water from the steam is provided on the side of the boiler, and only the steam is taken out. When the water level in the boiler is high or the amount of heating to the water pipe is large, the boiling water will boil up a lot and a large steam separator will be required, and carryover will occur if the boiling water cannot be separated into gas and liquid. To do. On the contrary, when the water level is low or the heating amount is small, the steam-water separator can be small, but the boiling water is less likely to be boiled up and the upper part of the water pipe may be overheated.

One of the forms of a multi-tube once-through boiler is to connect a number of water pipes between the upper and lower pipe drawers, provide a burner on the side of the water pipe group, heat the water pipes from the side, and There is a boiler that brings the water to a boil. In the case of this boiler, the water pipe near the burner is directly heated by the heat of the burner, and is strongly heated, and the water pipe far from the burner reaches only the combustion gas having a lowered temperature, so that the heating is weak. Therefore, the heat load differs depending on the water pipe, the difference in the boiling state inside the pipe, a large amount of boiling water is lifted on the side near the burner to cause carryover, and the water pipe upper part is overheated on the water pipe far from the burner. is there.

[0004]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to prevent a carry-over and a water pipe overheat which occur due to different heat loads of the water pipe in a boiler which heats a water pipe group from the side by using a small gas. It is to do it in a water separator.

[0005]

[Means for Solving the Problems] A large number of water pipes are connected between the upper pipe header and the lower pipe header, a burner is provided on the side face of the water pipe group, the water pipes are heated from the side faces, and the water in the water pipes is boiled to bring the upper pipe In a multi-tube once-through boiler that takes out the vapor-liquid mixed vapor containing boiling water from the head, multiple steam separators are installed, the first steam separator is connected to the upper steam collector, and the second steam is separated. The vessel is connected to the first steam-water separator, the vapor of the gas-liquid mixture is first introduced into the first steam-water separator, a part of the boiling water is removed by the first steam-water separator, and then the The water level in the can was set higher than usual by introducing it into a steam-water separator to remove boiling water.

[0006]

By providing the steam-water separator twice, it is possible to prevent the occurrence of carryover even if the amount of boiling water that is boiled up is large, so that the water level can be kept high. By raising the water level, it is possible to prevent overheating in a water pipe that is far from the burner and has little boiling.

[0007] In the case of a boiler that heats a water pipe group from the side, the height is lower than that of a boiler having a burner in the upper part, and there is an empty space in the upper part of the boiler, and a steam separator can be installed in the upper part of the boiler. it can. By installing the steam-water separator in two stages, the amount of boiling water reaching the steam-water separator provided on the side of the boiler, which has been used in the past, decreases
The steam separator can be small. By reducing the size of the steam / water separator on the side of the boiler, it is possible to save space in the boiler itself.

[0008]

An embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, a vertical water pipe group (3) is installed between the upper header (1) and the lower header (2). The burner (4) for heating the water tube group is provided from the side surface of the water tube group toward the water tube group, and causes the combustion gas to flow in a direction intersecting with the water tube group. A first steam / water separator (5) is installed on the upper part of the boiler, and a second steam / water separator (6) is installed on the side of the boiler. The water separator is connected, and the first steam / water separator and the second steam / water separator are connected by the second connecting pipe (8). A downfall pipe (9) is connected between the lower parts of both steam separators and a lower pipe header, and a steam pipe (10) is provided above the second steam separator.

The water supplied to the lower header is sent to each water pipe, and the water pipe is heated by a burner to become steam and boiling water. Sent to the vessel. At this time, the water level in the can is set higher than usual so that the upper part of the water pipe far from the burner is not heated. Therefore, a large amount of boiling water will boil up in the water pipe near the burner. In the first steam-water separator, the first vapor-liquid separation is performed, and the separated boiling water is returned to the lower head by passing through the downcomer, and the boiling water that cannot be separated from the steam is the first steam. It is sent from the separator to the second steam separator through the second connecting pipe. Gas-liquid separation is performed again in the second steam separator, and the separated boiling water is returned to the lower tube through the downcomer, and only steam is taken out from the steam tube. Even if the boiling water increases, it is possible to prevent the carry-over from occurring by providing the steam-water separator twice, and since the boiler water level is higher than usual, it is possible to prevent overheating in the water pipe far from the burner. .

[0010]

By preventing the carry-over and keeping the water level in the boiler high, it is possible to prevent overheating of the upper part of the water pipe far from the burner. Further, the steam separator installed on the side of the boiler can be downsized, and the space of the boiler itself can be saved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

[Explanation of symbols]

 1 Upper pipe head 2 Lower pipe head 3 Vertical water pipe group 4 Burner 5 First steam separator 6 Second steam separator 7 First connecting pipe 8 Second connecting pipe 9 Precipitation pipe 10 Steam pipe

Claims (1)

[Claims] 1. A plurality of water pipes are connected between the upper pipe header and the lower pipe header, a burner is provided on the side face of the water pipe group, the water pipes are heated from the side face, and the water in the water pipes is boiled to boil water from the upper pipe header. In a multi-tube once-through boiler that takes out the vapor-liquid mixed vapor containing the water, a plurality of steam-water separators are provided, the first steam-water separator is connected to the upper head, and the second steam-water separator is It is connected to a steam-water separator, first introduces vapor-liquid mixture steam into the first steam-water separator, removes part of boiling water with the first steam-water separator, and then separates the second steam-water. Boiler with multiple steam separators that can be introduced into a vessel to further remove boiling water and make the water level in the can higher than usual.