JPH0245625Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a wall blower device that cleans the wall surface of a boiler with steam, and is particularly suitable for preventing furnace wall tube erosion caused by condensate spouting at the initial stage of startup. The present invention relates to a blower device.

<Prior art and its problems> A wall blower device that blows out steam is installed on the furnace wall of a boiler in order to remove deposits from the furnace wall tube.

In this device, a tube (hereinafter referred to as a lance tube) that has a nozzle at the tip that spouts steam and that moves forward and backward and stops is fed into the furnace through a small diameter opening in the furnace wall from outside the furnace. The furnace walls are sprayed clean.

A conventional device will be explained with reference to FIG. In a conventional cleaning operation, steam for the slow pipe is first sent to warm up the lance pipe. Next, the nozzle 3 of the lance tube is extended from the outside of the furnace to the inside of the furnace by the drive device lever 4 from the stop position 5, and is set to the injection cleaning position (cleaning steam jetting position). Next, when it is confirmed that the nozzle 3 is set to the injection cleaning position 6, steam is supplied from the steam pipe and the steam flowing through the tube 2 is sprayed directly from the nozzle 3 to the furnace wall tube.

The force of this steam blows off the deposits that have accumulated on the furnace wall tubes, thereby cleaning them. When the cleaning process is completed, the steam supplied to the nozzle is cut off, and the nozzle 3 is pulled back from the inside of the furnace to the outside of the furnace by the lever 4, and when it reaches the stop position, one process of cleaning the furnace wall tube is completed. This process is usually repeated several times.

At the beginning of the wall blowing operation, the steam pipes cannot be completely warmed up and are cold, so the incoming steam turns into drains, and there is stagnant drain in the steam pipes, tube 2, etc., so there is no drain in the furnace wall tubes. will be sprayed directly. At this time, the furnace wall tubes are blown with drain, causing erosion.

<Purpose of the invention> This invention eliminates the drawbacks of the prior art described above, and provides a furnace wall surface that cleans the furnace wall tubes without causing erosion caused by stagnant condensate in the tubes being directly blown onto the furnace wall tubes. The purpose is to provide a steam blower device.

<Summary of the Means> In short, this invention is a wall blower device in which a lance tube having a nozzle at the tip protrudes into the furnace to clean the furnace wall surface, and injects steam at a position inside the furnace from a position where the nozzle cleans the furnace wall surface. This wall blower device is characterized by being equipped with an initial startup device that starts the process.

<Example 1> An example of the present invention will be described with reference to FIG.
The wall blower device is located outside the furnace wall tube 1 forming the furnace of the boiler, and is composed of a lance tube 2, a nozzle 3 located at the end thereof, a drive device 8 for the lever 4, and a control box 9. has been done. The furnace wall tube 1 is provided with a penetration part (small diameter opening) for the lance tube 2 having a nozzle 3 at its tip to pass through, and the lance tube 2 and the nozzle 3 attached to the tip of the lance tube 2 are connected to a lever By the link mechanism 4, it is extended and displaced so as to protrude from the outside of the furnace to the inside of the furnace. When the nozzle 3 reaches a predetermined position (indicated by reference numeral 7), steam is supplied from a steam pipe for supplying steam to the wall blower device, and the furnace wall pipe is cleaned. Immediately after the cleaning of the furnace wall tube is completed, the lance tube 2 is moved from the inside of the furnace to the outside of the furnace by the link mechanism of the lever 4. First, when the steam pipe for supplying steam to the wall blower device is heated, a signal indicating whether or not the pipe has been sufficiently warmed is sent from a temperature transmitter 10 installed near the connection between the link 4 and the lance pipe 2. is sent to the control box 9. A command to drive the drive device 8 is issued from the control box 9 based on the comparison with the numerical value stored in the control box indicating that the warm pipe is sufficient. As a result, the lance tube 2 is sent from the outside of the furnace to the inside of the furnace by the link mechanism, and is set at the initial startup position 7.

When it is confirmed that the nozzle is set to the initial startup position 7, steam is supplied from the previously warmed steam pipe, flows through the lance pipe 2, and is injected from the nozzle 3.

At the beginning of the wall blower startup, the steam pipe cannot be warmed up completely and is cold, so the incoming steam becomes drain, and the inside of the steam pipe and the lance pipe 2.
Since there is stagnant condensate in the drains, etc., the condensate mixes with the steam and blows out together with the steam. The relationship between the nozzle 3 and the furnace wall tube 1 at the initial startup position 7 is as follows:
When condensate mixed with steam is ejected from the nozzle 3, the ejected jet is separated from the furnace wall tube at a distance that does not reach the furnace wall tube, and erosion of the furnace wall tube 1 due to the ejected condensate at the initial stage of startup is prevented.

When the condensate mixed with steam is sufficiently ejected from the nozzle 3 at the initial start position 7 and only steam is injected, it is possible to move on to the cleaning process. This state can be confirmed from the display on the temperature transmitter 10 or the drain discharge time. Next, nozzle 3 is at the initial startup position 7.
The lever 4 is moved to the spray cleaning position 6 by the link mechanism of the lever 4, and the deposits adhering to the surface of the furnace wall tube 1 are blown away by the steam jet injected from the nozzle 3, thereby cleaning the furnace wall tube 1.

The device for confirming the position of the nozzle in the furnace and controlling the steam supply described above is called an initial startup control device.

When the cleaning process is completed at position 6 during injection cleaning, the supply of steam from the steam pipe is cut off, and the nozzle 3 is immediately pulled back from the inside of the furnace to the outside of the furnace by the link mechanism of the lever 4. The process is completed. These can be known from the position display device 11 or a simple link lever angle display plate attached to the link 4. This process is repeated several times for each opening (not shown) in the furnace wall through which the lance tube passes.

<Example 2> An automatic/manual changeover switch (not shown) provided in the control box 9 is used to switch to manual, and the device is made to perform manual cleaning operation while observing the display on the position display device 11 that displays the position of the nozzle 3. be able to.

<Effects of the invention> In the conventional technology, due to the piping structure of the steam supply source, stagnant condensate in the pipes was directly injected into the furnace wall tubes at the initial stage of startup of the wall blower, causing erosion in the furnace wall tubes.

By implementing this idea, the nozzle can be set at a position where there is sufficient space between the nozzle and the furnace wall tube at the beginning of the wall blower startup, that is, a position where the jet will not reach the furnace wall tube when the stagnant condensate in the tube blows out. Erosion of the furnace wall tubes can now be prevented.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the relationship between the configuration and operation mode of the device according to this invention, and Fig. 2 is a layout diagram showing the configuration and operation mode of each device of a steam-type wall blower device according to the prior art. It is. DESCRIPTION OF SYMBOLS 1... Furnace wall tube, 2... Lance tube, 3... Nozzle, 4... Link, 8... Drive device, 9... Control box, 10... Temperature transmitter, 11... Position display device.

Claims (1)

[Claims for Utility Model Registration] 1. A wall blower device in which a lance tube having a nozzle at its tip protrudes into the furnace to clean the furnace wall surface, wherein the nozzle injects steam at a position inside the furnace rather than a position where the nozzle cleans the furnace wall surface. A wall blower device comprising an initial startup device for starting the blower. 2 Utility Model Registration Scope of Claims 1. The wall blower device according to claim 1, which is provided with a nozzle position display device and a changeover switch for switching between supplying warming steam and supplying wall blowing steam to the lance tube.