JPH0640604U - Connection structure of brackish water separator of multi-tube once-through boiler - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] In a multi-tube once-through boiler that performs three-position control, brackish water that can maintain a predetermined ph while maintaining the amount of return and circulating even during high combustion and low combustion. To provide a separator. [Composition] Two connecting pipes for connecting the brackish water separator 6 and the upper header 1 are provided, and when the amount of the air-water mixture is small, most of the flowing water flows through the lower connecting pipe 5 to secure the return amount of saturated water. When the air-water mixture is large, it also flows to the upper connecting pipe 4 so that the return amount of the saturated water does not increase too much.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a connecting structure of a brackish water separator of a multi-tube type once-through boiler that performs three-position combustion control.

[0002]

[Prior art]

 The steam-water mixture generated from the boiler body is separated into steam and saturated water by a brackish water separator, the steam is sent to the load side, and the saturated water is returned to the lower part of the boiler body. The once-through boiler is stipulated by law as "the ratio of the circulating water amount to the maximum water supply amount is 2 or less". In other words, the return amount is capped by legal regulations. In a small once-through boiler that performs three-position combustion control, the boiling water state in the water pipe during high combustion differs from that during low combustion, so even if the return amount is set to the maximum allowable range during high combustion At low combustion, saturated water returns less due to pipe resistance and structural restrictions. Therefore, at low combustion, the pH of the bottom water near the lower pipe is low, and corrosion damage is likely to occur.

[0003]

[Problems to be solved by the device]

 The problem to be solved by the present invention is, in a multi-tube once-through boiler that performs three-position control, circulates while maintaining the return amount within the maximum allowable range even during high combustion and low combustion, and at a predetermined pH in the lower header. To supply a boiler with a brackish water separator.

[0004]

[Means for Solving the Problems]

 In the present invention, in order to solve the above-mentioned problems, there are two connecting pipes, one is a connecting pipe connecting the brackish water separator and the upper header to the side of the upper header and the other is the connecting pipe extending from the upper face of the upper header. Install book connecting pipes.

[0005]

[Action]

 Since the pipe drawn from the side of the upper header has less pressure loss than the pipe drawn from the upper part, most of the air-water mixture is discharged from the side of the upper header during low combustion where the amount of air-water mixture generated is small. It flows into the brackish water separator from the pipe that is drawn out and secures a predetermined saturated water return amount. During high combustion, due to the increase in the flow rate of the steam-water mixture and the increase in the steam supply to the steam load, the steam-water mixture cannot flow only with the pipe drawn from the side, but also with the upper draw pipe. In other words, the amount of saturated water returned during high combustion can be increased or decreased depending on the flow rate to the upper drawing pipe, so it is possible to determine the amount of return (circulation ratio) for high combustion and low combustion separately.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. In a multi-tube once-through boiler with multiple water pipes (3) installed between the upper pipe head (1) and the lower pipe pipe (2), a brackish water separator (6) was installed and saturated water return pipe (8) Is connected to the lower header (2). Figure 1 shows the connecting pipes (5) drawn from the side of the upper header and the connecting pipes (4) drawn from the upper surface of the upper header (1) and the brackish water separator (6). Install as shown.

[0007]

[Effect of device]

 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. Body corrosion is reduced.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of an example of implementation of the present invention.

[Figure 2] Conventional brackish water separator

[Explanation of symbols]

 1 Upper pipe head 2 Lower pipe head 3 Water pipe 4 Communication pipe 5 Communication pipe 6 Brackish water separator 7 Boiler body 8 Saturated water return pipe

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[Procedure amendment]

[Submission date] October 29, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Added

[Correction content]

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of an example of implementation of the present invention.

[Figure 2] Conventional brackish water separator

[Figure 3] Conventional brackish water separator

[Explanation of reference symbols] 1 upper pipe head 2 lower pipe pipe 3 water pipe 4 connecting pipe I 5 connecting pipe II 6 brackish water separator 7 boiler body 8 saturated water returning pipe

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. In a multi-tube once-through boiler in which an upper header and a lower header are connected by a large number of water pipes, a brackish water separator is provided by a connecting pipe from a side surface of the upper header and a connecting pipe from an upper surface of the upper header. A brackish water separator connection structure for a multi-tube once-through boiler that connects the upper heads.