JPH0882404A - Detecting method for choking of water level control cylinder during starting of boiler - Google Patents

Abstract

PURPOSE: To perform safe operation of a boiler by a method wherein when water is fed during the starting of a boiler, in a case a water level is detected by a lower electrode in a water level control cylinder, the feed of water is stopped and when a water level is detected by an upper electrode rod after a lapse of a given time, it is decided that a lower communication pipe is about to be choked. CONSTITUTION: Choking of a water level control cylinder 13 with feed water is decided as a self diagnosing function available during the starting of a boiler l. Namely, when boiler water flows in through drive of a feed water pump 4, a water level in a water level control cylinder 13 is raised, and a water level is detected by a lower electrode rod M in the water level control cylinder 13, the feed water pump 4 is stopped. When a water level is detected by an upper electrode rod S after a lapse of a given time, for example, 30 seconds, it is decided that a part of the lower communication pipe 16 is about to be choked, and this effect is alarmed. This constitution performs safe operation of the boiler 1 and prevents the occurrence of short water in a cold district where there is a fear of freezing occurring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting clogging of a water level control cylinder when starting a boiler.

[0002]

2. Description of the Related Art As is well known, in recent years, a remote control system using a communication line has been frequently used for operation control of a boiler or the like, and a can body structure of the boiler or the like has been variously improved. Therefore, various new operation control methods for boilers have been proposed.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a detection method for detecting whether or not water is being reliably supplied into the water level control cylinder in the water supply at the time of startup in the operation control of a boiler or the like. It is what

[0004]

The present invention has been made to solve the above-mentioned problems, and a water supply pump is inserted into a water supply line connected to a boiler, and the lower electrode rod M and the upper electrode are connected to the boiler. In a configuration in which a water level control cylinder equipped with a rod S is connected via an upper communication pipe and a lower communication pipe, water level in the water level control cylinder rises due to water supply when the boiler is started, and the lower electrode rod M has a water level. When the water is detected, the water supply pump is stopped, and after t seconds, the upper electrode rod S
When the water level is detected, it is determined that the lower connecting pipe is about to be clogged.

[0005]

According to the present invention, when water is supplied at the time of starting the boiler, when the electrode for detecting the lower water level in the water level control cylinder detects the water level, the water supply pump is stopped and the electrode for detecting the upper water level after t seconds. If detects the water level, it determines that the lower connecting pipe that supplies water to the water level control cylinder is almost clogged.

[0006]

The preferred embodiments of the present invention will be described below. In FIG. 1, the boiler 1 includes a can body configured by connecting a substantially annular upper header 6 and a lower header 7 with a plurality of water pipes 8. A burner 10 to which a blower 9 is connected is placed on the upper surface of the upper header 6.
A fuel supply line 12 having a fuel supply solenoid valve 11 inserted therein is connected to the burner 10. The burner 10
Is started and stopped based on the pressure inside the boiler. When the pressure inside the boiler reaches a specified value, the burner is stopped, and when the pressure inside the boiler drops to a specified value, the burner is operated. To control.

A water supply line 2 in which a check valve 3 and a water supply pump 4 are inserted is connected to the lower header 7.
A water level detector 14 including a lower electrode rod M and an upper electrode rod S is provided in the water level control cylinder 13, and the water level control cylinder 13 is provided.
The upper end of the upper header 6 via the upper connecting pipe 15
The lower end is connected to the lower header 7 via the lower connecting pipe 16.
Are connected to each. The water supply pump 4 is turned on and off based on the output signal from the water level detector 14.
It is controlled so that the water level in the boiler is maintained at a predetermined level.

A steam outflow pipe 18 having a main steam valve 17 inserted therein is connected to the upper header 6. The steam generated in the boiler 1 is supplied to each device via the steam outflow pipe 18. Each of the above-mentioned members is connected to a controller (not shown) via a line (not shown).

In the above structure, the water level control cylinder 13
A method of detecting a water supply clogging will be described. At the time of starting the boiler 1, first, the water supply pump 4 of the water supply line 2
To supply boiler water into the boiler 1. In a normal state by the supply of this canned water, as shown in FIG. 2, the water level rises in the boiler 1 and flows into the water level control cylinder 13 from the lower header 7 through the lower communication pipe 16, When a furnace, rust, or the like is generated in the lower header 7, the furnace, rust, or the like may adhere to the inlet of the lower communication pipe 16 to prevent the inflow of can water.

Therefore, a clogging of water supply to the water level control cylinder 13 is determined by a self-diagnosis function when the boiler 1 is started.
That is, when the canned water flows in by the driving of the water supply pump 4 and the lower electrode rod M in the water level control cylinder 13 detects the water level, the water supply pump 4 is stopped via the controller (not shown), and t If the upper electrode rod S detects the water level after a second (about 30 seconds), it is determined that a part of the lower connecting pipe 16 is about to be clogged, and an alarm to that effect is issued.
When the lower electrode rod M does not detect the water level even after a predetermined time (about 50 seconds) has passed since the boiler 1 was started, it is determined that the lower connecting pipe 16 is blocked and an alarm is issued.
In this embodiment, two M and S electrode rods have been described, but it is also suitable when two or more electrode rods are used.

Next, an embodiment replacing FIG. 1 will be described with reference to FIG. The members common to those in FIG. The embodiment shown in FIG.
A separator 19 is provided between the upper header 6 and the steam outlet pipe 18.
The separator 19 and the lower header 7 are provided.
1 and a water level control tube 13 similar to that of the embodiment shown in FIG. 1 is provided, the upper end of the water level control tube 13 is connected to the separator 19 via the upper connecting pipe 15, and the lower end is connected to the lower connecting pipe 16. Are connected to the lower headers 7, respectively. still,
The method for detecting clogging of the water level control cylinder at boiler startup is
The description is omitted because it is similar to the above-described embodiment.

[0012]

As described above, according to the present invention, when water is supplied at the time of starting the boiler, the water level in the water level control cylinder rises, and when the lower electrode rod M detects the water level, the water supply pump is stopped and t If the upper electrode S detects the water level after a second, it is determined that the lower connecting pipe is about to be clogged. Therefore, check the water supply state into the water level control cylinder when the boiler is started. By performing maintenance immediately, the boiler can be operated safely. In a cold region where there is a risk of freezing, it is possible to prevent empty heating.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a relationship between time and water level in a water level control cylinder according to the present invention.

FIG. 3 is an explanatory diagram showing an embodiment that replaces the embodiment of FIG.

[Explanation of symbols]

 1 Boiler 2 Water supply line 4 Water supply pump 13 Water level control cylinder 15 Upper connecting pipe 16 Lower connecting pipe M Lower electrode rod S Upper electrode rod

Claims (1)

[Claims] 1. A water feed pump 4 is inserted into a water feed line 2 connected to a boiler 1, and a water level control cylinder 13 having a lower electrode rod M and an upper electrode rod S is attached to the boiler 1 and an upper connecting pipe 1 is provided.
5. In the structure connected through the lower connecting pipe 16, when the boiler 1 starts up, the water level in the water level control cylinder 13 rises due to the water supply when the boiler 1 is activated, and when the lower electrode rod M detects the water level, the water supply pump 4 Is stopped, and if the upper electrode rod S detects the water level after t seconds, it is determined that the lower communication pipe 16 is about to be clogged.