JPS599422A - Method and apparatus for inspecting inside of smokestack - Google Patents

Abstract

PURPOSE:To carry out measurement for the inside of a smokestack correctly in the state that the main body of a measuring means is fixed at a required position on the inner wall surface of the smokestack, by pressing the main body of the measuring means onto the inner wall surface of the smokestack by the pressure of exhaust gas flowing upward through the inside of the smokestack. CONSTITUTION:A winch 9 and a controller 10 are installed on a stage S of a smokestack C, and the main body 1 of a measuring means is connected to one end of a wire 8 unwinded from the winch 9. Further, the controller 10 and a control terminal of the measuring means are connected by a lead wire 11. Such a measuring means 1 is inserted into the smokestack C. As the measuring means 1 is depended downward along the flue of the smokestack C, the pressure of exhaust gas flowing upward through the inside of the smokestack C is acted to vanes 2A, 2B, so that the measuring means 1 is urged onto the wall surface W until its legs 3 rest on the wall surface W. In this state, the main body of the measuring means is supported at a position space a prescribed distance from the wall surface W. When the measuring means 1 is placed at a required position, photographing of the inner wall surface of the smokestack, measurement of pH and sampling of the wall surface are performed by way of remote-controlled operation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for inspecting the inside of a chimney.

The inner walls of chimneys need to be inspected regularly because they are corroded by harmful components such as sulfur compounds contained in the combustion gas. In particular, in a chimney equipped with a wet flue gas desulfurization device upstream, the pH of the mist generated reaches a maximum of 0.06, so corrosion of the flue is unavoidable.

Some chimneys are over 100m in height, and if they are used in a damaged state without proper maintenance and management through internal inspections, they may collapse and cause serious accidents and costs, so it is important to neglect inspections. I can't do it. Especially in recent years, the temperature of exhaust gas has been lowered to save energy, and corrosion due to the acid dew point has been accelerated. Due to these circumstances, it is necessary to inspect the condition of the chimney's internal lining, the presence of cracks on the chimney's inner walls, and the condition of acid mist.
These internal conditions cannot be determined from the outside of the chimney, so it is necessary to go inside the chimney and take measurements. For this reason, in the past, gondolas were hung from the upper opening of the chimney, and workers riding in the gondolas brought in hammers, cameras, and measuring instruments to collect data and analyze the data to determine the corrosion status. The task of investigating and inspecting was very laborious and required a high level of skill, and inspections could only be carried out by specialized engineers.

In addition, since humans enter the chimney to collect materials, this can only be done while their bodies are in smoke, and it is impossible to verify the reliability of the collected materials.
It was not possible to expect a thorough inspection and investigation. Currently, there are approximately 100,000 chimneys in Japan, of which it is estimated that 10,000 are in danger of collapsing and require urgent inspection and repair, and 50,000 are subject to inspection. There is.

However, in reality, due to the lack of specialized engineers and the inability to stop the smoke from flowing, most factories leave their chimneys as they are despite their concerns, and efforts are being made to eliminate this danger. , a bill is being considered that would require chimney owners to regularly inspect their chimneys. The present invention solves the above problems by inserting a measuring device suspended from a wire through the entire upper end opening into a chimney that is passing smoke, and detecting an upward draft of exhaust gas rising inside the chimney. is applied to the vane plate provided on the main body of the measuring instrument, and the wind pressure pushes the measuring instrument body against the inner wall surface of the entire chimney, and with the measuring instrument main body fixed at a fixed position on the inner wall of the entire chimney, the measuring instrument provided on the main body The feature is that measurements inside the chimney can be carried out by remote control. Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 show an inspection device showing an embodiment of the present invention. The inspection device includes a measuring device main body 1 in which various measuring devices are mounted inside a casing, and a wing plate 2 equipped on the main body 1.
and 3 legs.

The measuring device body 1 is equipped with equipment for collecting data necessary for inspecting the inside of the chimney, such as a camera, a floodlight, a pH measuring device, and a sampling device. In both cases, details are omitted from illustration. The blade plate 2 is composed of an upper blade plate 2A and a lower blade plate 2B, and the upper blade plate 2A is mounted on a shaft 4 supported on the upper part of the goose song 1A of the measuring instrument main body 1 and installed on both sides of the main body 10.
The lower wing plate 2B extends below the gun 1A, has a shaft 6 supported by the fc rod 5, and is attached to this 4IIIB. In either case, the angle relative to the measuring instrument body 1 can be adjusted by adjusting the rotation angle of lll1lI4.6. This vane plate 2 is used to press the measuring instrument body 1 against the inner wall surface of the chimney by receiving pressure from the rising airflow of exhaust gas rising inside the chimney, and its posture is set to be inclined with respect to the direction of the flue. Although it does not necessarily have to be composed of the upper vane 2A and the lower vane 2B, the arrangement and structure of the vanes are required to maintain the measuring instrument main body 1 in a stable posture from aerodynamic viewpoints. Further, although it is not always necessary to adjust the angle of the vanes, the pressing force acting on the main body 1 can be adjusted depending on the amount of airflow by adjusting the angle of the vanes.

The legs 3 are for supporting the measuring instrument main body 1 pressed against the inner wall surface W of the chimney at a position a certain distance away from the inner wall surface W of the chimney. In order to stably support the main body 1, in all embodiments, two legs 6 are provided on both sides of the upper part of the measuring instrument main body 1, and one leg is provided on the lower part thereof. A "sled" for sliding on the inner wall surface is provided at the end of each leg, but wheels may be attached instead of this "sled". A weight 7 is installed at the bottom of the measuring instrument main body 1, and a hanging wire 8 is connected to the upper end of the weight 7.

In FIG. 3, a winch 9 and a controller 10 are installed on a stage S of a chimney C, and a measuring instrument main body 1 is tied to the end of a wire 8 pulled out from the winch 9. The terminals are connected with lead wires 11, and the measuring device main body 1 is inserted into a chimney C through which smoke is flowing through its upper end opening. When the measuring instrument body 1 is lowered along the flue in the chimney C while fully rewinding the winch 9, an updraft of exhaust gas rising in the chimney C (generally 10~
A wind pressure of 30 m/see) is applied to the vane plate 2, and the measuring instrument body 1 is pressed against the wall surface W by that pressure, the legs 5 are placed on the wall surface W, and the measuring instrument body 1 is kept a certain distance away from the wall surface W. supported in the upright position. Wire 8 while rewinding winch 9
When the gas is sent out, since the vane plate 2 is constantly under pressure from the rising airflow of exhaust gas, the measuring instrument body 1 descends along the inner wall of the chimney C while being pressed against the wall surface W by the pressure.

When the measuring device main body 1 reaches a predetermined position or every time it reaches a certain depth, it is stopped, and at that position, the inner wall of the chimney is photographed, the pH is measured, and a part of the wall is sampled by remote control. . The measurement location inside the chimney can be easily determined by the length of the wire 8, and the obtained data can be detected as an electrical signal to the outside through the lead wire 11, or can be measured over the entire length of the chimney after the inspection is completed. After collecting the container body 1 from inside the chimney C, take it out. Weight 7
This is to ensure that the measuring instrument main body 1 always maintains a vertical posture within the chimney against the wind pressure of exhaust gas.

The weight is adjusted so that the measuring instrument body 1 is pressed against the wall surface with an appropriate pressure by the wind force of the exhaust gas. Sorting,
Since the pressure acting on the vane 2 also changes by adjusting the angle of the vane 2, the pressing force applied to the measuring instrument main body 1 can be adjusted.

As described above, the present invention utilizes the wind pressure of the exhaust gas rising inside the chimney to bring the measuring device main body 1 into pressure contact with the inner wall surface of the chimney C, and by mounting various devices on the measuring device main body 1, The inside of the chimney can be inspected unattended and while smoke is flowing, making it easier to maintain and manage the chimney and preventing accidents such as breakage. In particular, according to the present invention, the measuring instrument body 1 is pressed against the wall by utilizing all the wind pressure caused by the upward airflow of exhaust gas, so that it can be hung unstable in any part of the chimney where the inner diameter of the lower part is larger than the diameter of the upper part. The measuring instrument body 1 can be stably fixed on the wall and lowered, and since the measurement is carried out while smoke is flowing, water droplets and soot that actually occur in the chimney C can be directly confirmed, which is advantageous when inspecting inside the body smoke. It is possible to obtain a rich amount of data that is difficult to understand.

As described above, according to the present invention, there is no risk of personal injury, the inside of the chimney can be inspected freely when necessary without stopping the operation of the equipment, and the conventional problems with chimney maintenance and management can be solved all at once. This has the effect of eliminating the problem.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of the apparatus of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a sectional view of a chimney showing the situation during measurement. 1... Measuring instrument body 2 (2A, 2B)... Wing plate 6... Leg 8 Upper wire C... Chimney W... Inner wall Fig. 1 Fig. 3 100-

Claims (2)

[Claims] (1) Insert the measuring instrument body suspended from a wire through the upper end opening into the chimney that is passing smoke, and cause the upward airflow of exhaust gas rising inside the chimney to act on the vane plate provided on the measuring instrument body, The interior of the chimney is characterized in that the measuring instrument body is pressed against the inner wall surface of the chimney by the wind pressure, and the inside of the chimney is measured using a measuring device provided in the main body while the measuring instrument body is fixed at a fixed position on the inner wall of the chimney. Inspection method. (2) The main body of the measuring device equipped with equipment for measuring inside the chimney,
A chimney interior inspection device comprising a blade plate inclined with respect to the upward direction of exhaust gas, legs to be seated on the inner wall surface of the chimney, and a hanging wire connected to the upper end of the measuring instrument body.