JPH0711295Y2 - Continuous blow device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a blower device for a boiler, and more particularly to a continuous blower device that is safe from the bottom of a can in a small boiler.

[Conventional technology]

Conventionally, water is supplied to a boiler, and when it is gradually evaporated, the water is concentrated in the boiler, so that it is necessary to blow at a certain time.

If a concentrated boiler is used, steam and water will co-operate, and the boiler will not be maintained normally due to a decrease in steam purity.

In the case of the blow of the boiler, it is the surface blow to attach the inner pipe to this part and blow it, because the steam concentration is more advanced near the water surface during normal operation.
(8) in the figure is a surface blow tube based on this concept.

Conventionally, a fixed amount of air is continuously blown by this surface blow pipe, and heat is exchanged with the feed water from the viewpoint of energy saving, and the continuous blow device (14) is contacted for heat recovery.

On the other hand, dissolved solids and impurities in the feed water are deposited as can mud on the bottom of the can. In this case, piping is attached from the bottom of the can to blow. This is called can bottom blow (9).

Therefore, the conventional continuous blower [Fig. 2, (8), (1
4), (13)] and can bottom blow (9) were used properly.

[Problems to be solved by the present invention]

Recently, the boiler has been improved in performance, becoming smaller and more compact.
The distribution of concentration on the surface and bottom of the boiler has been remarkably reduced.

Therefore, there is an increasing demand for boilers that do not need to blow canned mud from the bottom of the can and that only continuous blowing is performed automatically only from the vicinity of the surface.

In response to the above-mentioned demand, the present invention is to provide a continuous blowing device which has been used on the conventional surface blowing side instead of the can bottom side and is controlled so that it can be continuously used at any time.

However, if the conventional continuous blower is connected to the can bottom blower as it is, it is extremely dangerous.

That is, the conventional continuous blower automatically blows a fixed amount of boiler water to the outside of the can continuously, and because heat is normally exchanged with the feed water, the feed water is turned on and off (ON, OF
Because it is controlled by F), the blow is turned on and off as the water is supplied.

When the continuous blower is connected to the bottom of the can, foreign matter may be caught in the solenoid valve that is turned on and off because it also discharges canned mud, which may cause a leak. There is a risk of causing a can accident (low water accident) and causing a major boiler accident.

Due to the above-mentioned dangers, it has been impossible in the past to connect a continuous blower to a bottom blower.

That is, since the excellent method capable of preventing the danger as described above was not found, the continuous blow could not be taken from the can bottom.

In view of the above, and in response to the demands of users, the present invention connects a continuous blower to a can bottom blower, and controls so that the mud content (scale part) of the can bottom is continuously blown out of the can at any time. It is an object of the present invention to provide a device capable of completely preventing the concentration of boiler water and blowing a scale portion by automatically and without causing a low water level accident.

[Means for solving problems]

This invention takes out the blower tube of the boiler water from the bottom of the boiler tube,
The blow pipe is branched from the portion of the blow pipe at the bottom of the boiler that is close to the boiler cylinder and rises to form a rising pipe (8a). The rising pipe (8a) is connected to the steam side connecting pipe (11), A branch pipe (8b) branched from a position between the normal bottom water level and the emergency bottom water level in the nuclear rising pipe (8a) is provided, and the nuclear branch pipe (8b) is connected to the continuous blowing device, and the nuclear solenoid valve (13) is A continuous blower device for a boiler that can be continuously blown from the bottom of the boiler by automatically turning it on and off at any time to automatically blow continuously from the bottom of the boiler Is.

The normal bottom water level (NLWL) in the present invention refers to the lower limit of the normal water level control range, and the emergency bottom water level (LLWL) is the water level below which it is dangerous and requires shutting off the burner.

〔Example〕

 An embodiment of the present invention is shown in FIG.

The blow can is branched from the root of the can bottom blow pipe (9) similar to the conventional one to stand up (8a), and the upper part is the water level gauge (10).
It was connected to the steam side connecting pipe (11) equipped with a pressure detector (12) and branched from between the normal bottom water level (NLWL) and the emergency bottom water level (LLWL) at the rising part of the rising pipe (8a). It is controlled from the bottom of the can by connecting the branch pipe (8b) to the continuous blower (heat exchanger) (14) equipped with the solenoid valve (13), and it is continuous at any time. Blow is enabled to prevent the concentration of canned water and to blow the scale, and even if the solenoid valve leaks, the water level of the boiler does not fall below the branch point of the rising pipe (8a). It was done like this.

[Effect of device]

In the conventional continuous blower for boilers, since the boiler water is automatically kept relatively clean by the continuous blower shown in FIG. 2 of the specification, the blow valve at the bottom of the can is manually operated. However, there were many accidents where the scale was stuck and blocked due to forgetting to blow manually, but the present invention prevented the boiler water from concentrating, discharging the scale, and continuing the safe operation from the bottom of the can. Blow is now possible, and there is no risk of reaching the bottom water level, making safe driving possible. Furthermore, when the conventional can bottom blowing device is turned on and off as water is supplied, foreign matter is caught in the solenoid valve and causes a leak, which leads to an empty can accident and a major boiler accident. In the present invention, the branch pipe (8b) is branched from between the normal bottom water level (NLWL) and the emergency bottom water level (LLWL) by the rising pipe (8a). The branch pipe (8b) is the rising pipe (8a)
When branched from above the NLWL, steam may be discharged, which may be discharged to the continuous blower (14), which is disadvantageous, and continuous blow cannot be performed automatically at any time. If (8b) is branched from below the LLWL, the burner is cut off and the water level cannot be operated. In this case as well, it is not possible to blow continuously. For the first time, the present invention succeeds in automatically blowing the boiler can water continuously at any time without discharging steam. That is, in the continuous blow device of the present invention, the continuous blow device (14) and the solenoid valve (13) are automatically turned on continuously at any time regardless of the control of the water supply of the water supply pipe. Turned off. That is, since the continuous blower equipped with the solenoid valve is adapted to automatically turn on and off the solenoid valve as described above, the solenoid valve continuously discharges the sludge continuously at any time. In addition, the high-concentration substance that is soluble in water, which is conventionally discharged in the case of surface blowing, so-called soluble solid, can be discharged by automatic continuous blowing of the can bottom. In terms of functionality, the continuous blow of the present invention makes it possible to combine the conventional surface blow and can bottom blow into one and automatically and safely perform this. Moreover, since the continuous blower of the present invention continuously blows at any time as described above, a large amount of can mud does not accumulate at the bottom of the can as in the conventional case, and therefore foreign matter is caught in the solenoid valve and leaks. It is possible to prevent the concentration of boiler water and to blow the scale safely and securely without causing any trouble or clogging the branch pipe (8b), and the advantages of the present invention are remarkably large. Is.

[Brief description of drawings]

FIG. 1 is an embodiment of the present invention, and FIG. 2 is a piping diagram of a continuous blower in a conventional boiler. 1 …… Body 3 …… Smoke pipe 4 …… Water surface 5 …… Main steam pipe 6 …… Water supply pipe 7 …… Water supply pipe 8a …… Rise pipe from the can bottom 8b …… Branch pipe 9 …… Can bottom blow pipe 10 ...... Water level gauge 11 ...... Steam side connecting tube 12 ...... Pressure detector 13 ...... Solenoid valve 14 ...... Continuous blow device (heat exchanger)

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-50-18802 (JP, A) JP-A-50-40902 (JP, A) JP-A-50-135403 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A can bottom is equipped with a boiler blow pipe, and a boiler water blow pipe is taken out from the boiler can bottom, and the blow pipe is branched from a root portion of the boiler can bottom blow pipe (9) close to the boiler barrel. To form a riser pipe (8a), and connect the riser pipe (8a) to a steam side communication pipe (11) at the upper part of the boiler body equipped with a pressure detector (12) and a water level gauge (10),
A branch pipe (8b) branched from a position between a normal low water level and an extremely low water level at the rising portion of the rising pipe (8a) is provided, and the branch pipe (8b) is continuously blown with a solenoid valve (13). By connecting to the device (14) and controlling the solenoid valve (13) to automatically turn on and off at any time,
A continuous blower for boilers, characterized in that it automatically blows continuously from the boiler can bottom.