JPH0645125Y2 - Boiler with stable water supply system - Google Patents

Description

[Detailed Description of the Invention] <Industrial field of application> The present invention relates to a boiler with a water level stable inner pipe for water supply, and in particular to a boiler with a water supply device inside a pressure vessel suitable for eliminating an imbalance in the water level of a boiler drum. It is about structure.

<Prior art and its problems> The water supply inner pipe described here is a perforated pipe in the body of a natural circulation type single shell radiant boiler to disperse can water that has passed through a economizer. 6 and 7, the details are shown in FIG. 6 and FIG.

Conventionally, as shown in FIG. 6 and FIG. 7, it has been confirmed that an amount of supply water that flows through the ejection holes 4 to the predetermined supply water pressure is supplied to the supply water inner pipe 3 which is arranged substantially along the entire length in the longitudinal direction of the air cylinder. The possible quantity is evenly arranged.

However, this water supply inner pipe is mainly for the purpose of distributed water supply,
No consideration was given to the prevention of fluctuations in the body water level caused by the difference in water supply flow between the right and left sides of the body.

This is due to the internal resistance of the water supply pipe connected near the left and right ends of the drum, the resistance of the valve, and the imbalance of the inflow amount of the steam-water mixture from the evaporation pipe connected to the upper body drum. It is always changing and its control is difficult. The difference in the water level at the left and right ends can reach 100 to 200 mm, depending on the amount of evaporation in the body length.

<Problems to be Solved by the Invention> The above-mentioned prior art does not consider the prevention of fluctuation of the water level of the body caused by the difference in the water supply flow rate between the right and left sides of the body. An unbalanced phenomenon occurs, and there is a problem of transmitting a low water level signal as if the water level had dropped.

<Object of the Invention> An object of the present invention is to eliminate the cause of the water level imbalance phenomenon and to propose a device capable of maintaining normal operation without stopping the operation of the boiler.

<Summary of Means> In brief, the present invention provides an orifice plate having a hole having a diameter corresponding to about 30 to 40% of the inner diameter of the water supply inner pipe in the central portion of the water supply inner pipe in the longitudinal direction of the body, and the flow rate of water supply to the left and right of the cylinder It is characterized in that the difference between is adjusted.

<Operation> By providing an orifice plate at the central portion of the inner tube of the water supply in the longitudinal direction of the cylinder, the water supplied from the left and right of the cylinder hits the orifice plate and absorbs the difference in flow rate between the cylinder and left and right.

As a result, the imbalance of the bladder water level is reduced, so there is no trip from the apparent low water level transmission.

<Embodiment> An embodiment of the present invention will be described with reference to FIGS.

FIG. 5 is a side view of the natural circulation type boiler, and shows the installation locations of the air cylinder and the economizer outlet header.

Fig. 1 shows a front view of the water supply inner pipe and shows the positional relationship between the water supply inner pipe and the orifice plate.
Water that has passed through 10 enters the inner tube 3 of the body water supply from the end plate of the left side 5 of the right side 6 of the right side of the body and is sprayed evenly throughout the inside of the body of the body through the ejection holes 4 arranged in the longitudinal direction of the body. ing.

FIG. 2 is a detailed view of a portion B of FIG. 1 and shows a mounting state of the orifice plate.

Insert the removable joint piece 2 and the integrated orifice plate 1 in the center of the water supply inner pipe 3, and consider the unbalance phenomenon between the left side water level 7 and the right side water level 7 caused by the difference in the water supply amount on the left and right sides of the body. It was done.

FIG. 3 shows a cross section taken along the line AA of FIG.

<Embodiment 2> Another embodiment of the present invention is shown in FIG.

In this embodiment, two natural water supply pipes are arranged in the longitudinal direction of the body of a natural circulation boiler. The effect of this embodiment is that by attaching an orifice plate to the central portion of each water supply inner pipe, it is possible to adjust the water level before and after the trachea in addition to the unbalanced adjustment of the water level of the left and right trachea.

<Effect> By implementing the present invention, it is possible to reduce the water level imbalance phenomenon due to the difference in the jet pressure of the porous portion of the inner pipe of the water supply, which is caused by the difference in the water supply volume between the left and right bodies. Therefore, by using the left and right detection average control method for the body level control signal, it is possible to prevent the operation of the boiler from being stopped due to the generation of the low water level signal, and thus it is possible to maintain normal operation.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an air cylinder with a water supply device according to an embodiment of the present invention, FIG. 2 is a sectional view of a joint piece according to the present invention, and FIG. 3 is a sectional view taken along the line AA of FIG. FIG. 4 is a plan view of a vertical cross section of a body showing a second embodiment of the present invention, FIG. 5 is a side view of a natural circulation boiler, and FIG. 6 is a drawing showing a conventional water supply inner pipe in a body. , FIG. 7 is a sectional view taken along line BB in FIG. 1 ... Orifice plate, 2 ... Joint piece 3 ... Water supply inner pipe, 4 ... Spout hole

Claims (3)

[Scope of utility model registration request] 1. A water supply system for supplying water from left and right ends of a water supply inner pipe having a length substantially corresponding to the entire length of a cylinder drum and having a plurality of water supply jet holes dispersed substantially evenly in the longitudinal direction. , A boiler with a water level stable type water supply device, characterized in that two inner pipes are connected by a joint piece with an orifice plate having an orifice plate to form one water supply inner pipe. 2. A boiler with a water level stable water supply device according to claim 1 of the utility model registration, wherein the orifice hole diameter is about 30 to 40% of the inner diameter of the water supply inner tube. 3. Claim for utility model registration claim 1 or 2
In the boiler with a water level stable water supply device according to the item 1, two water supply inner pipes are positioned parallel to each other with their lengths, the left and right ends are connected to form one loop, and the water supply pipes are connected to the left and right ends respectively.