JP2895802B2 - Boiler scale deposition detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting scale accumulation in a boiler.

[0002]

2. Description of the Related Art In the case of a boiler for extracting steam by heating can water, solids contained in feed water are precipitated as the can water is concentrated, and a scale is generated in which the solids adhere to the inner surface of the water pipe. The scale attached to the inner surface of the water pipe not only causes a decrease in thermal conductivity but also separates from the water pipe and deposits on the lower header, and the deposited scale may clog the water pipe. Since the accumulation of scale cannot be known from the outside, the inside of the water pipe must be checked visually, but the check by visual inspection is often not performed. When the discovery that scale was deposited was delayed and the water pipe was clogged with the deposited scale, the canned water could not be sent to the water pipe part, and the water pipe was overheated, possibly causing the water pipe to burn.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a boiler scale accumulation detecting device which automatically detects scale accumulation and outputs an output when the scale accumulation is performed. .

[0004]

Means for Solving the Problems A plurality of water tubes are connected between an upper header provided at an upper portion and a lower header provided at a lower portion,
In addition, a burner for heating the water pipe is provided, and steam is generated by heating the can water in the water pipe.The boiler that supplies water through a water supply pipe connected to the lower part of the boiler and discharges can water through a blow pipe has an electrode end. The scale detection electrode provided in the lower header is provided so that a current can flow inside the lower header, and the scale detection electrode is energized after the can water is discharged, so that the inside of the lower header is The continuity is checked, and if the continuity is detected, the scale deposition is output.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. The upper header 1 and the lower header 2 are connected by a number of water pipes 3 made of copper pipes. The upper header 1 is connected to a steam extraction pipe 4, and the lower header 2 is connected to a water supply pipe 7. A burner 11 for heating the water pipe 3 is provided at the lower part of the boiler, and a blow pipe 10 is provided at the lower header 2. The blow valve 5 provided in the middle of the blow pipe 10 is opened to discharge can water. Water is supplied by a water supply pump 7 on the water supply pipe 7
The water supply is controlled so that the water level in the water pipe becomes a predetermined height, and the supplied water is sent to the water pipe 3 through the lower header 2. The lower header 2 is provided with a scale detection electrode 9 having an electrode end provided in the lower header 2, and a current can flow when there is a conductor between the scale detection electrode 9 and the can body. So that The water supply pump 8, the scale detection electrode 9, the burner 11, and the blow valve 5 are respectively connected to the control device 6, and the control of each device is performed by the control device 6.

When generating steam, the control device 6 operates the water supply pump 8 so that the water level in the boiler becomes a predetermined water level, and burns the burner 11. The heat generated by burning the burner 11 heats the water pipe 3 and heats the water in the water pipe 3 to generate steam. The generated steam is taken out from the steam take-out pipe 4.

[0007] When steam is taken out by heating the can water, since the solids contained in the feed water do not evaporate, the can water is concentrated, and the solids contained in the feed water are deposited and deposited on the inner surface of the water pipe. The scale 12 adheres. When the thickness of the scale 12 adhered to the inner surface of the water pipe becomes a certain value or more, the scale 12 is separated from the inner surface of the water pipe, and the peeled scale 12 is deposited on the bottom of the lower header 2. The control device 6 opens the blow valve 5 and discharges the can water, and thereafter, supplies electricity to the scale detection electrode 9 to check the electric resistance between the scale detection electrode 9 and the can body. When the scale detection electrode 9 is energized, current does not flow unless there is a conductor in the lower header 2, but if the peeled scale 12 is deposited on the bottom of the lower header 2, a certain amount of time elapses after drainage. Until the current flows through the lower header 2, the control device 6 outputs an alarm for scale accumulation when the conduction, which is the current flow, is detected.

[0008]

By implementing the present invention, scale deposition can be detected by the boiler itself, and during scale deposition, the boiler itself outputs an abnormal output, so that the deposition can be known before it is too late, and the discovery is delayed. Burnout of the water pipe can be prevented.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper header 2 Lower header 3 Water pipe 4 Steam extraction pipe 5 Blow valve 6 Control device 7 Water supply pipe 8 Water supply pump 9 Scale detection electrode 10 Blow pipe 11 Burner 12 Scale

Claims (1)

(57) [Claims] 1. An upper header provided at an upper portion and a lower header provided at a lower portion are connected by a number of water tubes, a burner for heating the water tubes is provided, and steam is heated by heating can water in the water tubes. In a boiler that supplies water by a water supply pipe connected to the bottom of the boiler and discharges canned water by a blow pipe, a scale detection electrode whose electrode end is provided in the lower header is provided. It allows current to flow, checks the conduction in the lower header by conducting electricity to the scale detection electrode after draining the water, and outputs scale accumulation when conduction is detected. Boiler scale deposition detector.