JPS62153605A - Water controller for once-through boiler - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a water flow control device for preventing local overheating of water pipes in J'3 of single-tube and multi-tube boilers.

[Prior art] In single-tube and multi-tube interflow boilers, in areas where the void ratio (volume ratio of gas in gas and liquid) is significantly large, the tube wall may deteriorate due to poor heat transfer to the heat medium (generally canned water). The temperature of the motor increases, causing damage due to overheating by 1G, which often causes serious problems in operation. The void ratio referred to here changes depending on factors such as load fluctuations, boiler internal pressure (set steam pressure), and physical properties of canned water (surface tension, contaminants, etc.). Therefore, in order to prevent overheating of the pipe walls due to an increase in void ratio, the change in void ratio is detected and the amount of water inserted into the pipes is adjusted (in the case of a multi-tube once-through boiler, the average water level in the pipes is adjusted). It would be effective to adjust the amount of water (), and this would not only be effective when the water pipe is overheated in proportion to the increase in void ratio, but also when the water pipe is overheated in proportion to the increase in void ratio, but also when the water pipe is overheated due to scale adhesion inside the pipe. This makes it possible to avoid the phenomenon of overheating (which cannot be distinguished from the former by appearance).

Generally, there is a known boiler water level control method and device that controls the water level in the boiler by detecting the boiler combustion load and adjusting the detected water level set value of a water level detector according to the load (Machima Sho 53). However, load detection alone is not sufficient to prevent overheating, and the void ratio will change if the pressure inside the boiler changes or if the physical properties of the can water change due to concentration of the can water, etc. , water pipes, etc. may overheat, or steam with poor dryness may be obtained.

[Objective and Summary of the Invention] In view of the above, this defense provides a water flow chamber for a boiler that detects the void ratio and operates a water flow control mechanism accordingly to maintain the water flow in the boiler at a required level. It provides the following equipment.

That is, this invention applies to single-tube and multi-tube once-through boilers.
5, comprising a void ratio detector, and a water adjustment mechanism that operates according to the void ratio, and controlling the water volume adjustment mechanism in accordance with a control signal from the void ratio detector to adjust the water content in the boiler. The device is characterized by being equipped with a control mechanism for controlling the device.

[Embodiments of the Invention Hereinafter, embodiments of the invention will be explained based on the drawings.
(1) is the combustion chamber, which is provided in a circular shape by a plurality of upright main pipes (2). The upper and lower ends of this water pipe (2) communicate with an upper header (3) and a lower header (4), respectively. (5) is a smoke pipe formed between the smoke chamber cover (6) and the water pipe (2), and a flue (not shown) is provided on one side of this smoke pipe. (7) is a burner installed above the combustion chamber (1). A standard control pipe (8) is installed outside the main body of the boiler separately from the main pipe (2), and this water level control pipe is connected to the connecting pipe (9) and the lower pipe header (3) by Gω. and lower pipe header (4)) ■Through main pipe (2)
It communicates with the inside of. WP is a water pump. (1
1) is a water level regulator, and this regulator operates according to the value of the void ratio detected by the void ratio detector surface located at the upper part of the water pipe. (I() is a control mechanism that controls the amount of water supplied by the water level regulator (11) and the water supply pump WP in accordance with a control signal from the void ratio detector port. Note that the void ratio detector described above is a known technology. It goes without saying that a commercially available product can be used, and the specific structure, arrangement, etc. thereof are omitted because they are not the gist of this invention.

The above embodiment described a multi-tubular once-through boiler, but
In a single-tube once-through boiler, a water volume regulator (not shown) is installed in place of the water level regulator 111) to control the water base in the boiler.

Now, when operating the boiler, the water supply pump WP supplies water to the water pipe (2), and the burner (7) burns fuel in the combustion chamber (1) to heat the water in the water pipe (2). do. The water level in the wood pipe (2) remains constant when the boiler is stopped, but when heated, bubbles are generated and the water level is raised. The water level at this time changes depending on load fluctuations, the pressure inside the boiler, the physical properties of the canned water, etc., resulting in changes in the void ratio. This is detected by the void ratio detector (2), and the water level regulator 111) and water supply pump WP are operated according to the detected value of the void ratio to control the amount of water in the boiler.

``Effect of the invention j As explained above, this invention provides a void ratio detector to detect the void ratio in single-tube and multi-tube once-through boilers, and operates a water flow rate adjustment mechanism according to the detected value. By controlling the amount of water in the water pipes, the appropriate amount of water is always maintained, preventing overheating of each part, especially the upper part of the water pipes, due to a drop in the water level, and preventing the generation of steam with poor dryness due to a rise in the water level. The boiler can be operated safely and smoothly.

[Brief explanation of drawings]

The drawing is a sectional view showing an embodiment of the present invention. (1)...Combustion chamber (2)...Main pipe (
3) Upper header (4) Lower header (5) Smoke seedlings (6) Smoke cover (7) Burner (8)
Water level control tube <9), C1I)...Connecting pipe 4
D...Water level regulator (12)...Void rate detector ■...Control mechanism WP...Water pump

Claims (1)

[Claims] The single-tube and multi-tube once-through boilers are equipped with a void ratio detector, and a water volume adjustment mechanism that operates according to the void ratio, and the water volume adjustment mechanism is controlled by a control signal from the void ratio detector. A water flow control device for a boiler, characterized in that it is equipped with a control mechanism that controls the flow of water within the boiler.