JP2555008Y2 - Connection structure of brackish water separator of multi-tube once-through boiler - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure of a brackish water separator for a multi-tube once-through boiler which performs three-position combustion control.

[0002]

2. Description of the Related Art A steam-water mixture generated from a boiler body is separated into steam and saturated water by a steam separator, the steam is sent to a load side, and the saturated water is returned to a lower header of the boiler body. The once-through boiler is legally stipulated that the ratio of the circulating water amount to the maximum water supply amount is 2 or less. In other words, the amount of return is limited by legal regulations. In a small once-through boiler that performs three-position combustion control, the boiling state of can water during high combustion and low combustion is different, so even if the return amount is set to the maximum allowable range during high combustion , the can Over boiling water
Since the amount of glue is small, the return amount of saturated water is small. For this reason, since the concentration does not proceed at the time of low combustion, the pH of the still water in the lower header becomes lower than an optimal state, and a corrosion failure is likely to occur.

[0003]

The problem to be solved by the present invention is that a multi-tube type once- through boiler that performs three-position combustion control maintains a return amount within an allowable range during high combustion and circulates.
An object of the present invention is to supply a boiler provided with a brackish water separator capable of maintaining a predetermined pH in the lower header by circulating an appropriate amount even during low combustion .

[0004]

SUMMARY OF THE INVENTION Upper header and lower header
Are connected by a large number of water tubes, and by heating the water tubes
The saturated water lifted with the steam generated
Brackish water separator is connected to the upper header and the connecting pipe.
Multi-tube once-through boiler with three-position combustion control
Connecting pipe connecting the brackish water separator and the side of the upper header
And the connection pipe of the brackish water separator.
Connection pipe and the lower draw pipe of the brackish water separator.
Connecting the upper part of the upper header
Provide an upper draw pipe of the entanglement pipe .

[0005]

[Function] Lower drawer pulled out from the side of the upper header
The upper piping drawn out from the upper surface of the upper header
Out for less pressure loss from the pipe, when the generation amount is small low combustion of steam-water mixture, the majority of air-water mixture under evacuation
Flow from the discharge pipe to the brackish water separator to secure the specified amount of saturated water return. During high combustion, the steam-water mixture is pulled down to increase the flow rate of the steam-water mixture and increase the steam supply to the steam load.
The drain pipe alone does not completely flow, and it also flows to the upper draw pipe. That is, since the amount of saturated water returned during high combustion can be increased or decreased by the flow rate to the upper extraction pipe, it is possible to determine a separate return amount (circulation ratio) for high combustion and low combustion.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings.
Multiple water tubes (3) between upper header (1) and lower header (2)
In a multi-tube once-through boiler equipped with a steam generator (6)
And return the saturated water return pipe (8) to the brackish water separator and lower pipe.
(2) . Upper header (1) and brackish water separator
As shown in Fig. 1, the connection pipe (5) drawn out from the side of the upper header and the connection pipe (4) drawn out from the upper face of the upper header are connected to a brackish water separation pipe as shown in Fig. 1.
To the lower part of the vessel, and the connecting pipe is connected to the brackish water separator
Connect the pipe to a higher part than the connected part.

[0007] Combustion control is in the third position of high combustion, low combustion, and stop
The water pipe is heated by combustion to generate steam
Let it. In the case of low combustion, there is little rise, but contact
Because of the piping, the gas-liquid mixture passes through the connecting piping
It is sent to the water separator and a certain amount of circulation can be obtained,
The bottom water in the lower header is appropriately concentrated. In case of high combustion
The gas-liquid mixture must first be connected to the piping.
Is sent to the brackish water separator,
What could not be removed through the connecting pipe to the brackish water separator
Sent. The connecting pipe is connected to the high part
Prevents the circulation amount from becoming too large and allows the circulation amount
Can be kept within range.

[0008]

[Effects of the Invention] By implementing the present invention, in a multi-tube once-through boiler with three-position combustion control, an appropriate amount of return can be obtained even during low combustion, so that the bottom header inner canister can be maintained at an appropriate pH. Corrosion of the can body due to low pH is reduced.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of an embodiment of the present invention.

FIG. 2 Conventional brackish water separator

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper header 2 Lower header 3 Water pipe 4 Communication pipe 5 Communication pipe 6 Steam separator 7 Boiler body 8 Saturated water return pipe

Claims (1)

(57) [Scope of request for utility model registration] An upper header and a lower header are connected by a number of water pipes, and steam generated by heating the water pipes.
A brackish water separator that separates the saturated water
Three-position fuel
In a multi-tube once-through boiler that controls firing , a brackish water separator and
The connecting pipe that connects the side of the upper header and the brackish water separator
The position higher than the part where the connecting pipe is connected
The connection structure of the brackish water separator of the multi-tube once -through boiler provided with the connecting pipe connecting the upper surface of the sea.