JPH07122484B2 - Boiler equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiler that boils water to generate steam, and in particular, a large amount of water in a boiler can is mixed with steam and sent to a steam using device side. The present invention relates to a boiler device that has been prevented.

2. Description of the Related Art An outline of a conventional boiler device will be described with reference to FIG.

Reference numeral 21 is a boiler, and a steam outlet 23 is provided at an upper portion of a can body 22 of the boiler, and a steam pipe 24 is connected to the boiler and connected to a steam using device (not shown). A manual opening / closing valve 25 such as a globe valve is attached to the steam outlet 23. A boiler water supply port 26 is provided in the lower portion of the can body 22, and water is supplied from a water supply source (not shown) via a water supply pump 27. The boiler water is supplied by the water level sensor 28 provided in the boiler can 22.
The water level inside is kept constant. Also, can body 22
A burner 29 for heating the boiler water is provided in the lower part of the, and fuel is supplied through a fuel valve 30.

Problems to be Solved by the Present Invention In the above, when the boiler water level in the can body 22 rises due to a defective water level sensor 28 or the like, the manual on-off valve 25 attached to the steam outlet 23 is set to a normally open state. Therefore, the boiler water is mixed with the steam and is carried out from the steam outlet 23, so-called priming or carryover occurs. If this priming or carryover becomes severe, a water hammer may occur on the steam pipe 24 side, or a device using steam may be corroded or damaged.

Therefore, the technical problem of the present invention is to detect priming and carryover and prevent them immediately.

Means for Solving the Problems Technical means of the present invention taken to solve the above technical problems, a proportional control valve is arranged in a steam pipe connected to a steam using device from a steam outlet of a boiler can, A humidity sensor for measuring the wetness of the steam in the steam pipe is provided, and a controller for adjusting the valve opening of the proportional control valve according to the wetness of the steam detected by the humidity sensor is provided.

Action The action of the above technical means is as follows.

When priming and carryover start to occur, the degree of wetness of the steam delivered from the steam outlet of the boiler can increases. The humidity sensor detects the wetness of steam and inputs it to the controller. When the wetness increases, the controller controls the proportional control valve so as to reduce its valve opening. Therefore, since the load of the boiler is reduced by reducing the valve opening of the proportional control valve, priming and carryover can be prevented.

Effects The present invention produces the following unique effects.

As described above, according to the present invention, priming and carryover can be prevented, so that corrosion or damage of the water hammer and the steam using device does not occur.

Example An example showing a specific example of the above technical means will be described (see FIG. 1).

Reference numeral 1 is a boiler, a steam outlet 3 is provided on an upper portion of a can body 2 of the boiler, and a steam pipe 4 is connected to the boiler and connected to a steam using device (not shown). A boiler water supply port 6 is provided below the can body 2, and water is supplied from a water supply source (not shown) via a water supply pump 7. The boiler water is supplied by the water level sensor 8 provided in the boiler can 2 so that the water level in the can 2 becomes constant. Further, a burner 9 for heating the boiler water is provided below the can body 2 and is provided with a fuel valve.
Fuel is supplied via 10.

Attach the proportional control valve 11 to the steam pipe 4. A humidity sensor 12 for measuring the wetness of steam is attached to the steam pipe 4. The wetness of steam detected by the humidity sensor 12 is controlled by the controller 13
And the valve opening of the proportional control valve 11 is controlled by a command from the controller 13.

The humidity sensor 12 is an infrared type that measures the amount of water in the steam by utilizing the fact that water has a large degree of absorption at a specific wavelength of infrared rays, and the details thereof will be described below.

A reflector 14 is attached to the bottom of the steam pipe 4. This reflector
A two-wire optical fiber connector 15 having a light emitting port and a light receiving port for receiving near infrared reflected light from the reflecting plate 14 is attached to the top of the tube opposite to 14. Near-infrared light having a wavelength absorbed by water is changed to light generated from the light emitting element 16 which is a light emitting device,
It is fed to the steam pipe 4 through a filter lens 17 that transmits only light of this wavelength. This near-infrared ray is reflected by the reflection plate 14, of which the two-wire optical fiber connector 15
The light receiving element 18, which is a light receiving device, generates an electric signal according to the light reaching the light receiving port of the light receiving device. The electric signal is amplified by the amplifier 19, and the calculator 20 calculates the wetness from the relationship between the absorption and the moisture value.

When priming or carry-over begins to occur, the degree of wetness of the steam sent out from the steam outlet of the boiler can 2 increases, so the controller 13 controls the proportional control valve 11 to reduce the valve opening degree. By reducing the valve opening of the proportional control valve 11, the load on the boiler 1 can be reduced, so that priming and carryover can be prevented.

Although the humidity sensor is arranged on the secondary side of the proportional control valve in the above embodiment, it may be arranged on the primary side of the proportional control valve. Further, although the near infrared humidity sensor is used as a means for measuring the wetness of the vapor, it is not limited to this.
Any material can be used as long as it can measure the wetness of steam.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a boiler apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of a conventional boiler apparatus. 1: Boiler, 4: Steam piping 11: Proportional control valve, 12: Humidity sensor 13: Controller

Claims (1)

[Claims] Claim: What is claimed is: 1. A proportional control valve is arranged in a steam pipe connected from a steam outlet of a boiler can to a steam using device, and a humidity sensor for measuring the wetness of steam in the steam pipe is provided, and the steam detected by the humidity sensor is provided. Boiler device provided with a controller that adjusts the valve opening of the proportional control valve according to the degree of wetness.