JP3443274B2 - Boiler water level detection tube communication tube blockage detection device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a clogging of a water level detecting cylinder connecting pipe of a boiler. 2. Description of the Related Art The water level of a boiler is detected by detecting the water level in a water level detection cylinder connected to a steam section in the upper part of the boiler and a bottom water part in a boiler by a water level detection pipe connecting pipe. . During boiler operation, the water level in the boiler cannot be detected directly because it rises up.
By providing an unheated water level detection cylinder linked to the can water section, an accurate water level can be detected. However, if the water level detection cylinder connecting pipe is clogged, the pressure of the canned water in the boiler will not be transmitted to the water level detection cylinder, and the water level detection cylinder will not be able to detect the water level. Therefore, if the water level detection tube connecting pipe becomes clogged, it is necessary to repair it immediately, and if the boiler is stopped due to sudden repair,
It also affects operations other than boilers. [0003] The problem to be solved by the present invention is to predict the clogging of the water level detecting tube connecting pipe at a stage before the clogging is completely clogged, and to detect an abnormality in advance so that the boiler can operate. The purpose of this is to prevent a sudden stoppage from affecting other operations. [0004] A water level detecting cylinder connected to a water level detecting cylinder connecting pipe is provided in each of an upper steam portion and a lower can water portion in the boiler, and the water level provided in the water level detecting cylinder is provided. In a boiler that controls water supply according to a water level detected by a detection electrode rod, another water level detection cylinder is provided separately from the water level detection cylinder, and the same height is set in each of the two water level detection cylinders. Then, a water level detection electrode rod for detecting the presence or absence of water and a timer device for measuring a difference in time for starting water presence detection by the two water level detection electrode rods at the time of water supply after performing all the blows are provided. When the value of the difference measured by the timer device is larger than a predetermined value, it is determined that the clogging is progressing, and an abnormality prediction signal is output in advance so that it is possible to cope with before the clogging is completed. An embodiment of the present invention will be described with reference to the drawings. A water supply pipe 1 is connected to the bottom of the boiler 5 and a steam extraction pipe 8 is connected to the top of the boiler 5.
Is provided, and the water supply pump 2 is operated to supply water. At the upper part of the boiler 5, a combustion device 9 for performing combustion inside the boiler is provided, and steam is generated by heating can water in the boiler, and the steam is taken out through a steam take-out pipe 8. For detecting the water level in the boiler, the water level detection tube
A water level detection tube 4 connected to the steam portion at the upper part of the boiler and the bottom water portion is used, and the water level detection tube 4 is provided with three water level detection electrode rods 10 for detecting different water levels as electric signals. deep. The water level detection electrode rods 10 are named electrode rod E1, electrode rod E2, and electrode rod E3 in order from the highest one, and each electrode rod detects the water level by detecting the presence or absence of water at the tip. . In addition, the water level detection cylinder 4
Separately, another water level detection cylinder 4 is provided, and the water level detection cylinder is provided with an electrode rod E4 which is a water level detection electrode rod for detecting a water level at the same height as the electrode rod E3. A control device 11 for controlling each of the boilers is electrically connected to the water supply pump 2, the combustion device 9, the electrode rods 10 for detecting the water level, and the like. When the electrode rod E2 detects that there is no water due to a decrease in the water level, the control device 11
When the electrode rod E1 detects the presence of water due to a rise in the water level, the operation of the water supply pump 2 is stopped to keep the water level in the can constant, and the electrode rod E3 or the electrode rod E4 becomes When the absence of water is detected, the combustion is forcibly stopped. In the control device 11, the moment when the electrode rod E3 switches from detection of absence of water to detection of presence of water,
Is provided with a timer device 3 for measuring the time difference at the moment of switching from the detection of absence of water to the detection of presence of water, and when the value of the measured difference exceeds a preset value, an abnormality prediction alarm is issued. An abnormality detection device 7 for outputting is provided. When the combustion by the combustion device 9 is carried out, the can water is heated and turned into steam. The steam is taken out from the steam take-out pipe 8 and the water taken out is supplied to the boiler 5. The solid matter is concentrated, and the scale adheres to the inner surface of the water pipe or sludge accumulates on the bottom of the boiler. [0008] The boiler periodically discharges all water in the can and removes sludge, etc., and periodically performs all blows. When the can water is exhausted by all the blows, all the water level detecting electrode rods detect the absence of water. . Thereafter, when water is supplied into the boiler 5 by the water supply pump 2, the water level rises in the boiler and the two water level detection cylinders 4. Of the electrode rods E3 and E4, from the time when the water presence detection signal on the side that has detected the presence of water first reaches the timer device 3 until the water presence detection signal from the other electrode rod reaches the timer device 3 The time difference is measured by the timer device 3. When the measured time difference exceeds a preset value, the abnormality detection device 7 outputs an abnormality prediction alarm to notify a user of the boiler that clogging is progressing. The water level cannot be detected if the water level of the water level detection cylinder 4 does not rise due to complete clogging, but the water level can be detected if the water level is not completely clogged. There is no need to stop. However, by performing repairs and the like as early as possible, measures are taken before the water level detection pipe connecting pipe 6 is completely clogged. [0009] The water level of the boiler is determined by detecting the water level in the water level detection cylinder 4 determined by the pressure of the canned water in the boiler. Otherwise, accurate water level detection cannot be performed. The clogging of the water level detecting tube connecting pipe 6 does not occur suddenly but proceeds gradually, but the water level in the water level detecting tube 4 fluctuates in accordance with the water level in the can until it is completely clogged. The progress of the clogging of the connecting pipe 6 cannot usually be detected. However, if clogging is progressing and the flow area of the cross section of the water level detection pipe connecting pipe 6 is narrowed, the amount of water sent to the water level detection pipe 4 through the water level detection pipe connecting pipe at the time of water supply after full blow is the normal water level. Since the amount of water sent to the water level detection cylinder through the detection pipe connecting pipe is reduced, the rise of the water level in the water level detection cylinder is delayed, and even if the electrode rod E3 and the electrode rod E4 are provided at the same height, the detection of the presence of water is started. There is a difference in time. The time difference is not due to the shaking of the water surface,
If the value is equal to or larger than a value that can be determined as an abnormality set in advance, it can be determined that clogging is in progress. By implementing the present invention, clogging can be predicted at a stage before the water level detection pipe connecting pipe is completely clogged, and repairs can be performed in accordance with the operation of the boiler. Can prevent sudden stoppage of the boiler.

[Brief description of the drawings] FIG. 1 is a flowchart of an embodiment of the present invention. [Explanation of symbols] 3 Timer device 4 Water level detection cylinder 6 Water level detection pipe connecting pipe 7 Anomaly detection device 10. Electrode for water level detection 11 Control device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F22B 37/78 F22B 37/42 F22B 37/38 F22B 37/46 F22D 5/06 G01F 25/00

Claims (1)

(57) [Claims] [Claim 1] A water level detection pipe connected to a water level detection pipe connecting pipe is provided in each of an upper steam section and a lower can water section in a boiler, and provided in the water level detection pipe. In a boiler that controls water supply according to the water level detected by the water level detection electrode rod, another water level detection cylinder is provided separately from the water level detection cylinder, and the same is provided in each of the two water level detection cylinders. A water level detection electrode rod for detecting the presence or absence of water at the height of the water, and a timer device for measuring a difference between times when the presence of water is started by the two water level detection electrode rods when water is supplied after all the blows are performed. At the same time, when supplying water after performing all blows,
Of the two water level detection electrode rods that detect the presence or absence of water,
Water detection signal on the side that has detected water on the timer device
Detection signal from the other electrode rod
Time difference until the timer reaches the timer
A boiler water level detection cylinder connecting pipe clogging detection device, which outputs an abnormality prediction signal when the difference value measured by the timer device is larger than a predetermined value.