JP4533623B2 - Gas detection system at a waste disposal site - Google Patents

Description

  The present invention relates to a system for detecting gas generated in, for example, a closed waste disposal site.

  In a waste disposal site for landfilling and storing waste, the ground is excavated and formed into a concave shape, and the waste can be sequentially landed in the concave portion. The landfill waste generates flammable or odorous toxic gases such as methane, hydrogen, carbon monoxide, and hydrogen sulfide. Therefore, it is necessary to measure the concentration of these harmful gases as needed from the viewpoint of the disposal site or the surrounding sanitary environment.

  In recent years, in view of environmental sanitation, a closed-type waste disposal site with a landfill site covered with a roof has been constructed. In this closed-type waste disposal site, the height of the surface of the waste gradually increases as the waste is landfilled, so if the gas concentration sensor is fixed, it will match the progress of waste landfill. Reworking them, which is cumbersome.

For this reason, as can be seen in Patent Document 1, for gas heavier than air, a gas detector is installed in a carrier that can variably set the installation altitude, and the gas from the waste surface is maintained at a predetermined altitude. Concentration detection is performed by installing a gas detector on the ceiling of gas lighter than air.
JP 2001-259560 A

  The conventional gas detection method in the waste disposal site can detect only a predetermined gas concentration at a predetermined altitude. The altitude and concentration characteristics of the gas generated from waste are highly reproducible due to various factors such as the shape of the disposal site itself, the shape of the landfill of the waste, the flow of air at the disposal site, its strength, temperature, and humidity. Not necessarily. That is, the altitude at which the highest concentration is detected is not constant due to various factors at the time of detection. Therefore, even if toxic gas is generated at a high concentration, if it is measured at a predetermined altitude, it may fail to be detected.

  Similarly, the concentration of gas that is lighter than air does not necessarily reach the maximum value near the ceiling due to various factors. Of course, the conventional gas detection method cannot detect a gas having the same weight as air and measure the concentration.

  Furthermore, when a plurality of sensors are arranged in the waste disposal site room according to the type of gas, the weight load of the carrier for supporting this is large, and the wiring becomes complicated.

  The present invention was created to solve the above problems, and a gas detection system capable of reliably detecting various toxic gases unevenly distributed in a space and measuring the concentration thereof in a waste disposal site where waste is buried. It is intended to provide.

In order to achieve the above object, the present invention provides a gas detection system in a waste disposal site for embedding waste, which is suspended from the ceiling of the waste disposal site and has a suction port provided at the tip. A sampling pipe; vertical movement means for moving the gas sampling pipe in the vertical direction ; position detection means for detecting a height position of the gas sampling pipe; and a suction end of the gas sampling pipe led out of the waste disposal site The gas sampling pipe is moved up and down by the gas detection means connected to the vertical movement means, and the gas concentration detected by the gas detection means at a plurality of height positions is detected by the position detection means. And a control unit that obtains and outputs the information together with the height information .

In the present invention, the gas sampling pipe may further include a horizontal moving means.

  Further, the vertical and horizontal moving means may be provided with position detecting means, respectively, and the gas concentration data may be output together with the vertical / horizontal position data obtained by each detecting means.

  Further, an alarm generating means for generating an alarm when the output gas concentration data exceeds a predetermined concentration may be provided, or a control means for driving the gas concentration reducing means may be provided.

  According to the gas detection method of the present invention, even when toxic gas generated in a closed waste disposal site is unevenly distributed, it is possible to reliably detect the gas and avoid deterioration of danger and environmental sanitation. .

  FIG. 1 is a front sectional explanatory view of a waste disposal site equipped with a gas detection system according to the present invention.

  In the figure, the waste disposal site 1 is a closed-type disposal site, and the periphery of the landfill portion 2 excavated in a stepwise symmetrical shape in front view so as to be concave toward the center is a wall portion 3. A gable roof 4 is laid on the upper portion of the wall 3, and the entire disposal site 1 is covered with a building 5 composed of the wall 3 and the roof 4.

  Ventilation equipment 6 is provided on both sides of the ridge portion of the roof 4, and a ventilation device 7 is provided on the wall 3, so that the inside and outside of the disposal site 1 are ventilated. The ventilation facility 6 includes, for example, an electric open / close skylight, and the ventilation device 7 includes an exhaust fan with a deodorizing filter or an air supply fan, and the inside and outside of the building 5 can be distributed.

  A gas sampling tube 9 is suspended vertically through a winding device 8 serving as a vertical moving means at the center and left / right symmetrical positions of the building 5, and a trumpet-shaped suction port 10 provided at the tip of the gas sampling tube 9 is disposed at the waste landfill 2. It is made to oppose the upper part of the waste A buried inside.

  The sampling tube 9 is made of, for example, a flexible tube, and is wound around the inside of the roof 4 and along the wall portion 3 and introduced into a separate building monitoring room 11 built outside the disposal site 1. .

  In the monitoring chamber 11, a control unit 16 including a suction pump 12, a gas detector 14, a measurement unit 15, and a computer is provided, and the gas sucked from each suction port 10 by the suction operation of the suction pump 12. Is introduced into the detector 14, and its concentration is measured by the measuring unit 15 as an electrical signal and output from here.

  The control unit 16 receives this electric signal, and based on this signal, controls the ventilation equipment 6 and the ventilation device 7 and outputs an alarm signal and the like. In addition, although these measuring devices are drawn as one, actually, a plurality of sensors are built in the detector 14 according to the type of gas for each suction pump, and the gas is branched in each sensor. The concentration is detected for each type of gas and is output individually. Accordingly, each gas concentration is measured individually and according to the type at the center and at the left and right of the building 5.

  The take-up device 8 can move the sampling tube 9 up and down in accordance with a command from the control unit 16 and can also move in a direction perpendicular to the paper surface of FIG. The concentration will be detected.

  FIG. 2 shows a specific example of the winding device 8. The winding device 8 includes a guide rail 20 disposed along the ceiling portion of the building 5, a pair of carriages 21 and 22 movably installed on the guide rail 20 and coupled to each other, and one carriage 21. A pair of suspension pulleys 23 arranged in a suspended state at the lower part of the guide rails, a guide pulley 24 arranged in a fixed state at the end of the guide rail 20, the suspension pulleys 23 and the guide pulleys 24, and One end is extended, connected to the take-up motor M1, and the other end is connected to the suction port 10 and a pair of wires W and a support bar 25 of the sampling tube 9 connected in parallel to the lower portions of the two carriages 21 and 22. And. A plurality of guide pulleys 26 for bending the sampling tube 9 are arranged at the lower part of the support bar 25, and the hanging intermediate portion of the sampling tube 9 at the tip side draws a relatively dense spiral around the vertical axis The lower end is connected to the suction port 10, the rear end is wound around a hose reel 27 installed in the monitoring chamber 11, and the end is connected to the suction pump 12.

  Therefore, the suction port 10 is moved up and down by the winding and unwinding operation of the wire W by the motor M1, whereby the concentration of each gas at each height position can be measured.

  Of the carriages 21 and 22, the carriage 22 is a drive carriage, which is driven by the motor M <b> 2 and can move forward and backward along the guide rail 20. Each motor M1, M2 has a built-in rotation detector such as an encoder, and sends the detection signal to the control unit 16. The control unit 16 also measures each measurement along with the height information and position information obtained by this signal. The type and concentration distribution of the gas obtained by the unit 15 are sequentially displayed on the monitor as a pair of information, whereby it is possible to obtain the altitude dependence of the gas concentration, the concentration distribution at the plane position, and the like.

  In this case, it is possible to visually grasp the distribution of the gas concentration by graphing the recorded information sequentially by appropriate processing software in which the altitude and the gas concentration are associated with each other and displaying the graph on the monitor.

  In addition, for example, when a predetermined concentration is exceeded, a gas detection result can be output as appropriate, such as generating an alarm output by display or sound through the control unit 16. In this case, if the sound and display of the alarm are changed according to a plurality of types of gases to be detected, it is possible to determine by auditory or visual sense which type of gas concentration exceeds the allowable range. In addition to this, when the predetermined concentration is exceeded based on the detection result, the above-described ventilation facility 6 and ventilation device 7 can be operated. In this case, the location to be ventilated can be specified by the position information. For example, if there are ventilating vents at a plurality of locations in the waste disposal site 1, the air can be effectively and intensively ventilated by sending clean air from the vents close to the place to be ventilated.

  In the above embodiment, the horizontal direction moving means can be moved only along the longitudinal direction of the building 5. However, by allowing movement in the XY direction, the single sampling tube 9 can be used to move in the plane of the building 5. In addition, all gas concentration distributions in the vertical direction can be measured.

  Moreover, although the hanging middle part of the sampling tube 9 is in a state in which a relatively dense spiral is drawn around the vertical axis, the suction port 10 can be rotated around a vertical axis or a horizontal axis provided in a cage provided at the bottom thereof. It may be wound around a simple drum.

  Further, a sensor such as an ultrasonic sensor for measuring a distance between the bottom surface and the top of the waste is provided on the bottom of the car, and the suction port 10 is kept at a predetermined distance so as not to hit the top of the waste. It can also be controlled manually or automatically.

It is front sectional explanatory drawing of the waste disposal site provided with the gas detection system concerning this invention. It is side sectional explanatory drawing which shows the detailed structure of the winding apparatus.

Explanation of symbols

1 Waste disposal site 5 Building 6,7 Gas concentration lowering means (6 ventilation equipment, 7 ventilation equipment)
8 Winding device (vertical moving means)
9 Gas sampling tube 10 Suction port 11 Monitoring room 14, 15 Gas detection means (14 gas detector, 16 measuring section)
20, 21, 22 Horizontal moving means (20 guide rails, 21, 22 carriages)
16 Control unit (control means)

Claims (6)

A gas detection system in a waste disposal site for burying waste,
A gas sampling tube suspended from the ceiling of the waste disposal site and provided with a suction port at the tip;
Vertical movement means for moving the gas sampling pipe in the vertical direction;
Position detecting means for detecting a height position of the gas sampling pipe;
A gas detection means connected to the suction end of the gas sampling pipe led out of the waste disposal site;
The gas sampling pipe is moved in the vertical direction by the vertical movement means, and the gas concentrations detected by the gas detection means at a plurality of height positions are acquired and output together with the height information detected by the position detection means. A control unit,
A gas detection system for a waste disposal site, characterized by comprising: 2. The gas detection system for a waste disposal site according to claim 1, further comprising horizontal moving means for the gas sampling pipe. A gas detection system in a waste disposal site for burying waste,
A gas sampling tube suspended from the ceiling of the waste disposal site and provided with a suction port at the tip;
Vertical movement means for moving the gas sampling pipe in the vertical direction;
A gas detection means connected to the suction end of the gas sampling pipe led out of the waste disposal site;
Means for horizontally moving the gas sampling tube;
A gas detection system for a waste disposal site, characterized by comprising: 4. A gas detection system in a waste disposal site according to claim 3, wherein position detection means is provided in each of the vertical and horizontal movement means, and gas concentration data is output together with vertical / horizontal position data obtained by each detection means. . In claims 1 to 4, at the stage where the output gas concentration data exceeds a predetermined concentration, the gas detection system in waste disposal sites, characterized in that a warning generating means for generating an alarm. 6. The gas detection system in a waste disposal site according to claim 5 , further comprising a control means for driving the gas concentration lowering means when the output gas concentration data exceeds a predetermined concentration.

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