JPS62153606A - 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 control device for preventing local overheating of water pipes in single-tube and multi-tube boilers.

[Prior art] In single-tube and multi-tube once-through boilers, the temperature of the tube wall decreases due to poor heat transfer to the heat medium (generally canned water) in areas where the void ratio (volume ratio of gas in gas and liquid) becomes significantly large. This often leads to damage due to overheating and serious operational problems. 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 tube wall due to an increase in the void ratio, the water m to be inserted into the tube by detecting the change in the tube wall temperature must be set at It is effective to adjust the amount of water (by adjusting the amount of water), so that it is effective not only when the wood pipe is overheated in proportion to the increase in void ratio, but also when the wood pipe is overheated in proportion to the increase in void ratio. This makes it possible to avoid the phenomenon of overheating (which cannot be distinguished from the former by appearance).

Generally, a boiler water level control method and device is known (Japanese Patent Application Laid-Open No. 53-92002 However, load detection alone is not enough to prevent overheating, and if the boiler internal pressure differs or the physical properties of canned water differ due to concentration of canned water, the void ratio changes and the water pipe etc. overheat,
It is easy to obtain steam with poor dryness.

[Objective and Summary of the Invention] In view of the above, the present invention detects the pipe wall temperature at the upper part of the water pipe, operates a water volume adjustment mechanism accordingly, and can always maintain the water volume in the boiler at a required level. This provides a water flow control device for boilers.

That is, the present invention provides single-tube and multi-tube once-through boilers that are equipped with a tube wall temperature detector at the upper part of the water tube, etc., and a water flow control mechanism that operates according to the tube wall temperature. Moe water distribution by control signal from the detector! The boiler is characterized by having a control mechanism that controls the tvAWJ mechanism to control the amount of water in the boiler.

[Embodiments of the invention] Hereinafter, embodiments of the invention will be described 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 sky formed between the smoke pipe 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 water level control tube (8) is provided on the outside of the boiler body separately from the main pipe (2), and this water level control tube is connected to the connecting pipe (9), the upper header (3) and the lower pipe by 1fD. Water pipe (2) connected to the stop (4)
It communicates with the inside of. WP is a water pump. □′
The water level regulator is a water level regulator that operates in accordance with the value of the pipe wall temperature detected by the pipe wall temperature detector surface located at the top of the main pipe. [F] is a control mechanism wall that controls the amount of water supplied by the water level regulator (11) and water supply pump WP according to the control signal from the detector (2). It should be noted that it is of course possible to use publicly known technology or a commercially available product as the tube-to-temperature detector mentioned above, and its specific structure and arrangement form are not the gist of this invention and will therefore be omitted. ing.

The above embodiment described a multi-tubular once-through boiler, but
In a single-tube once-through boiler, a water level regulator (01) is replaced by a water regulator (not shown) to control the amount of water in the boiler.

Now, when operating the boiler, the water supply pump WP supplies water to the main pipe (2), the burner (7) burns fuel in the combustion chamber (1), and the water in the water pipe (2) is removed. Heat. The water level in the main pipe (2) is 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, boiler internal pressure, and the physical properties of canned water, resulting in changes in void ratio and tube wall temperature. This is detected by the pipe wall temperature detector port, and the water level regulator 11) and water supply pump WP are operated according to the detected pipe wall temperature value to control the amount of water in the boiler.

[Effects of the Invention] As explained above, the present invention detects the tube wall temperature by providing a tube wall temperature detector in single-tube and multi-tube once-through boilers, and adjusts the water control mechanism according to the detected value. By increasing the amount of water in the water pipe to 1 liter, the appropriate amount of water can be maintained at all times, preventing overheating of each part, especially the upper part of the water pipe, 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. It is possible to prevent this and ensure safe and smooth boiler operation.

[Brief explanation of drawings]

The drawing shows an embodiment of the present invention and is a sectional view of an IC. (1)... Combustion chamber (2)... Water pipe (
3)...Upper header (4)...Lower header (5)...Smoke chamber (6)...Smoke chamber cover (7)...Burner (8)...
Water level control tube f9), (1[1)...connecting pipe
l1l)...Water level regulator -...Pipe wall temperature detector [F]...Controll (I Mechanism WP...Water pump patent applicant Miura Kogyo Co., Ltd. drawing procedure correction often spontaneous) December 1986
May 5th 1, Indication of the case Patent application filed on November 6, 1986 (2) 2, Name of the invention I°1. Ma-Zui Riseng 4-IR'@1 V Ima' Kairyu Boifu water flow control device 3, relationship with the case of the person making the amendment Patent applicant 4, column for detailed explanation of the invention in the specification to be amended 5. Details of the amendment, page 2, lines 11 to 14, “Overheated...
The phrase ``to avoid the phenomenon of overheating'' has been corrected to ``to avoid the phenomenon of overheating.''

Claims (1)

[Claims] Single-tube and multi-tube once-through boilers are equipped with a tube wall temperature detector at the upper part of the water tube, etc., and are equipped with a water flow adjustment mechanism that operates according to the tube wall temperature, and are controlled by a control signal from the tube wall temperature detector. A water amount control device for a boiler, comprising a control mechanism that controls the amount of water in the boiler by controlling the water amount adjustment mechanism.