JP2912748B2 - Control device for 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 an apparatus for controlling all blows in a multi-tube once-through boiler.

[0002]

2. Description of the Related Art When the operation time of a boiler becomes long, the total solid content in feed water is concentrated, and if the solubility exceeds the solubility, most of the solid content is deposited. Becomes Further, a carryover occurs due to the forming phenomenon, and the dryness is reduced. Therefore, in order to prevent the solid content concentration of the boiler can water from rising above a certain level, it is necessary to blow. As for the blow, a method of measuring the conductivity of the can water, etc. and performing intermittent blow when the concentration reaches a certain level, and calculating the total evaporation residue concentration in the can water using the feed water quality and the amount of water by an automatic calculation device Then, the whole blow method is taken.

The method of intermittently blowing the water by constantly detecting the conductivity of the still water is complicated and expensive, and the detection sensor may malfunction due to contamination by scale or the like. In addition, the method of calculating the total blow time by calculating from the water supply water quality and water supply amount, and performing the full blow, the calculation is performed by an automatic calculation device, so the device becomes complicated, and the water quality changes and the can water conductivity due to intermittent blow are reduced. There is a problem that can not cope with the change.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to simply detect the concentration of all evaporation residues in can water and to display the time of all blows or to transmit a signal to indicate the total blow time of a multi-tube once-through boiler. In providing the equipment.

[0005]

In the present invention, when the concentration of the total evaporation residue of the can water increases, the dryness decreases, and when steam is supplied from the boiler, the steam is supplied from the upper header to the steam separator. In the pipe of the above, the pipe resistance increases. When controlling the boiler can water level by connecting the upper part of the water level detection cylinder to the brackish water separator and the lower part of the water level detection cylinder to the lower header, if evaporation residue etc. in the boiler water increases, the upper pipe The resistance in the pipe connecting the drawer and the brackish water separator increases, and the water level in the water level detection cylinder for all blows drops below the water level in the water level detection cylinder. By detecting this water level difference, the entire blow time is detected.

[0006]

According to the present invention, when the boiler is burning and the water level electrode of the water level detecting cylinder detects a normal water level, and when all the blow electrode rods of all the blow detecting cylinders detect that there is no water, all the blows are performed. Since it is determined that it is necessary, the determination device is simple and the processing can be performed reliably.

[0007]

An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a water level detecting cylinder for water level adjustment in a can (1)
The lower part is connected to the lower header (7), the upper part is connected to the brackish water separator (3), several electrode rods are installed in the water level detection cylinder, and the water level is controlled to a constant water level width by the electrode rods in them. Perform Also,
A water level detecting cylinder (2) for all blows is provided with an upper header (4) connected at the upper part and a lower header (7) connected at the lower part. Several electrode rods are provided in the detection cylinder, and one of them is fully blown. This is an electrode (6).
When the electrode rod of the water level detection cylinder (1) detects the normal water level while the boiler is supplying steam, and all the blow electrode rods (6) of the water level detection cylinder for all blows detect no water, the control device ( According to 10), it is determined that the entire blow time is reached, and the control device (10) causes the display of the all blow time or the output of the all blow time signal.

[0008]

According to the present invention, when the concentration of the evaporation residue in the boiler starts to increase while the boiler is generating steam, it can be easily determined by detecting the water levels of all the blow electrodes. further,
By detecting the water level of the two electrode rods, the electrode rod of the water level detection cylinder and the all-blow electrode, it becomes possible to detect the entire blow time more accurately.

[Brief description of the drawings]

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water level detection cylinder 2 Water level detection cylinder for all blows 3 Brackish water separator 4 Upper header 5 Connection piping 6 Detection rod for all blows 7 Lower header 8 Water pipe 9 Water supply pump 10 Control device

Claims (1)

(57) [Claims] 1. A water level detecting cylinder having an upper portion connected to a brackish water separator and a lower portion connected to a lower header, and provided with a plurality of electrode rods for controlling the water level of the boiler using the electrode rods. In a multi-tube once-through boiler in which an electrode rod is provided in a water level detection cylinder for all blows whose lower part is connected to a lower header, while the boiler is generating steam by combustion, the water level electrode of the water level detection cylinder detects a normal water level, and A multi-tube once-through boiler control device, characterized in that when the electrode of the water level detecting cylinder for all blows detects that there is no water, an all blow time display or an all blow time signal is transmitted.