JPS59195991A - Apparatus for treating gas generated in reclaimed land - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The invention is based on the fact that gases generated in landfills, etc., where domestic garbage and industrial waste collected from ordinary households are buried underground, etc. This is related to equipment that burns and disposes of substances that are not only a source of gas, but also pose a risk of poisoning and explosion.

Such processing devices have conventionally been configured as follows.

A non-breathable membrane (C) made of vinyl or the like is interposed between the F lower layer (a) and (b), and the membrane (C)
) is provided with a pipe (e)... having a large number of generated gas inlet holes 0)..., and the generated gas from the buried layer (a) is collected by these pipes (e)... , gas introduction pipe (f)
At the same time, the tN is collected and introduced into a combustion device (h) installed in a processing device (g) for combustion treatment.

Note that (1) in the figure is the ladder to the auxiliary combustion gas, and (j)
is the igniter.

However, such a conventional processing apparatus has the following drawbacks.

In other words, generally speaking, the gas generated at a landfill site is
CH4,CO,,H,,0),,)1.0 gas is the main component, and it is a re-combustible, foul-smelling gas, but depending on the amount of gas produced and the composition ratio, the weather, temperature, type of reclaimed material, etc. Varies significantly. In particular, if there is a change in the content of methane gas (CJ), which is the main combustible component,
Since the temperature fluctuates significantly from below the lower flammability limit to below the lower flammability limit, even if you try to lead it to the combustor A (h) for combustion, the combustion may not be good, or the flashback phenomenon and the buried W layer may occur. (a) PCs were often used to cause dangerous situations such as explosions inside.

The non-invention was made in view of the above-mentioned conventional situation, and its purpose is to prevent the above-mentioned dangerous backfire phenomenon, regardless of the amount of gas generated or the composition ratio. The purpose is to provide compensation for disposal bags for gas generated in landfills, etc., which can reliably prevent gas from burning and explosions.

In order to achieve the above object, an uninvented device for processing gas generated in a landfill, etc., supplies gas generated in a landfill, etc., such as garbage, to a combustion appliance through a generated gas introduction pipe and burns it. In order to carry out the processing, the apparatus is provided with a sensor for detecting the gas pressure or gas flow rate in the generated gas introduction pipe to the combustion appliance, and the gas pressure or gas flow rate detected by the sensor is equal to or lower than a predetermined value. At a certain time, a mechanism is provided to automatically close a valve interposed in the generated gas introduction pipe.
It has the following characteristics.

The functions and effects exhibited by the above characteristic configuration are as follows.

That is, uninventively, when gas produced in a landfill is combusted in a combustion appliance, an entrainment phenomenon occurs when the gas pressure in the pipe introducing the generated gas to the combustion appliance is lower than a certain level.
Or, it is based on the consideration that when the gas flow velocity is smaller than a certain level (these are essentially synonymous), and the gas pressure in the generated gas introduction pipe is When it is detected that the gas flow rate is low enough to cause an entrainment phenomenon, the valve installed in the inlet pipe is automatically closed or kept open, so that the gas flow rate can be prevented from occurring. Regardless of the amount of gas or the ratio of its components, it has now become possible to burn the generated gas in a manner that always reliably prevents dangerous phenomena such as backfire and even explosion.

Hereinafter, embodiments of the invention will be described based on the drawings.

Figure 2 shows gas generated in landfills, etc. due to non-invention.
The schematic structure of the principle embodiment of the apparatus for a-burning treatment is shown. (1) is a combustion cylinder with an open top and bottom, and a fan (2) that blows air upward is provided at the bottom of the cylinder. Above the fan (2), in the upper and lower middle part of the combustion tube (1),
The generated gas inlet pipe (
4) K-connected generated gas combustion appliance (5 burners are provided, and a gas header (6) for auxiliary combustion is installed in the upper end of the combustion appliance (5) in a state that it connects externally). In the figure, (7) is the igniter, and (8) i
'! This is a fuel supply pipe for auxiliary combustion in which a main valve and flow control valve (9) is interposed.

The generated gas introduction pipe (4) is provided with a shutoff valve O.
Q is equipped with frn, and a sensor 0υ for detecting the gas pressure in the pipe (4) is installed on the downstream side thereof, and this sensor (11) is Low gas pressure (low gas pressure that may cause a flashback phenomenon despite the presence of the flame arrester (3))
When this is detected, the shutoff valves 01 and 0.1) are interlocked and connected so that the shutoff valve a*f is closed (if it is originally in the closed state, it is maintained in that state).

The combination of the sensor 01) and the cutoff valve αO may be a combination of a diaphragm sensor and a mechanical cutoff valve, a diaphragm switch sensor and an electromagnetic cutoff valve, or a combination of the sensor 01) and the cutoff valve αO. Alternatively, an analog pressure sensor and an electromagnetic cutoff valve may be connected via a control device wt (not shown), and any structure that can realize the above operation may be used.

Further, a cutoff valve (a cutoff valve may be provided on the upstream side of IQ) for the sensor θυ.

Furthermore, since there is a unique correlation between the gas pressure in the pipe (4) and the gas flow rate, the sensor 01) may be one that detects the entire gas flow rate instead of one that detects the gas pressure. Good too.

If the above configuration is used, the gas pressure (shrinkage or gas flow rate) in the generated gas inlet pipe (4) that is supplied to the combustion appliance (5) will be such that the gas pressure (gas pressure) is likely to cause a backfire phenomenon. If the flow rate is below (C) or below, the sensor Q
1 detects this, and the shutoff valve (In maintains the open state, or fl closes, so even if the auxiliary combustion gas header (6) is ignited, the generated gas in the combustion appliance (5) will not flow. Combustion will not start, and even if the generated gas is being combusted in the combustion appliance (5), the combustion will automatically stop immediately. This ensures that the dangerous phenomenon of explosion can be prevented.

FIG. 8 shows a schematic configuration of an applied embodiment, in addition to the configuration of the basic embodiment shown in FIG.
Ql of the shutoff valve of ), (10 (for safety)
Another gas pressure detection sensor 0 was installed on the upstream side of the gas pressure detection sensor 0 (hereinafter, θυ is the first sensor, (Ia'e
”12 sensor), isolation valve OI, (11
is closed, the second sensor θ4 on the upstream side has a constant value (
When a gas pressure higher than a certain value (Pyr ) which is larger than Pr, ) is detected (a gas pressure high enough that there is no possibility of causing a flashback phenomenon), the above-mentioned shutoff is activated in conjunction with the detection operation. The valves (II, Ql) are configured to open automatically. With this configuration, the gas pressure in the generated gas inlet IF (4) will once prevent the backfire phenomenon. Even if the combustion in the combustion appliance (5) is stopped due to a low pressure of F:n, the gas pressure in the pipe (4) will be high enough that there is no risk of causing a flashback phenomenon. If it returns to n, the valve 01.QQ will automatically open.
is returned to open operation, and the combustion of the generated gas in the combustion appliance (5) is started again.

Incidentally, in order to exhibit the same function as that of the tortoise, a configuration as shown in FIG. 4 may be adopted.

That is, the cutoff valve (10, Of
One analog type gas pressure detection sensor (IIAOυ) is provided on the upstream side of 1, and the gas pressure signal obtained by this sensor 01) is converted into the constant value (Py,) - (PT
The signal is inputted to a control device α1 having a processing function using two threshold values corresponding to ()K, and this control device 0 is caused to control the valves O1 and C11 in the same manner as in the applied embodiment. Note that the configuration of other parts is the same as that of the applied example described above.

FIG. 5 shows a schematic configuration of an applied embodiment.

That is, an electromagnetic shutoff valve (1, 4+) is installed downstream of the main valve/flow control valve (9) of the auxiliary combustion fuel supply path (8).

0 → (two are provided for safety), and a generated waste combustion system N is installed near the upper end of the combustion tube (1).
(5) A first flame sensor is installed to detect all the combustion flames in the auxiliary combustion gas header (6), and a first flame sensor is installed at the bottom of the combustion tube. A second frame sensor α is provided. These frame sensors OQ and os are as follows.
Any type of sensor can be used, such as a light-sensing sensor or a heat-sensing sensor.

In addition, the former valve substream fi of the auxiliary combustion fuel supply pipe (8)
The control valve (9) is equipped with a sensor aη that detects when it is opened and issues a signal.

0 is a control device, and K is a sensor (lη) for detecting the opening of the valve (9), and a first and second sensor 0υ for detecting the gas pressure of the generated gas introduction pipe (4).
, @work above @l and second frame sensor Q! ?
, Each detection signal from QQ is input, and various control signals obtained by processing the input signals based on a predetermined sequence are output from the output port, and the fan (
2), igniter (7) and shutoff hull 7'QO, (10,
C4,0 is configured to control both eyes.

This control M! In the Q frame, the valve (9) is activated when the sensor 0 η detects that the valve (9) has been artificially opened, and the period until it is detected that the valve (9) has been artificially closed. , the following automatic control is performed. Note that such control (1) can be realized with a hardware-only configuration or with a software configuration using a microcomputer, but here,
The sequence in the latter case will be explained based on the flowchart in Figure 6.

First, in step (+), the cutoff valve θ4 of the auxiliary combustion fuel supply pipe (8) is opened to '(141'), and the fan (2) is fully operated.

Next, in step (II), actuate the igniter (7),
And, the igniter (
7) will continue to operate.

Then, in step all), it is determined whether or not the gas pressure in the generated gas introduction path (4) is likely to cause flashback noise.
Check with the second gas pressure sensor (to), and if there is no risk, move to step (1v) to VC and open the cutoff valves αI, 0 (J) to start the next Stella 7° (V)
On the other hand, if it is determined that there is a backfire, the controller moves to step 1) and closes valve 00 (or maintains the closed state), and also closes valve 0.
Shu, αa is also closed, and the fan (2) is also stopped.
This state continues until the %2 gas pressure sensor (2) detects that the gas pressure in the introduction pipe (4) has returned to a sufficiently safe high pressure, and when the gas pressure returns to a sufficiently safe level, step (1) is carried out.
Return to

In step (V), it is checked whether or not the generated gas is being combusted in the generated gas combustor A (5) using the TRS and FISL flame sensors, and if it is, the generated gas is being burned by itself. It is determined that the concentration is in a sufficiently flammable concentration range, and the cut-off valve α → (14) of the auxiliary combustion fuel supply pipe (8) is closed and the process moves to step (V). If there is no combustion, or if the first flame sensor (LeFC) detects no flame, and the combustion is so slight that no flame is detected, the valve α4. The combustion in the gas header (6) is maintained and the sixth
Moving on to the step width shown in figure (ri).

In step 611i), the first gas sensor αυ,
1st flame sensor 051 and original valve/flow rate Fu
Continue to monitor all sensor 07) for ll valve (9),
The first gas sensor 〇η indicates that the gas pressure in the introduction pipe (4) is reverse T.
If it is detected that the temperature that causes the phenomenon has decreased to a certain level, the process returns to step (V[) and waits until the gas pressure becomes high enough, and the first flame sensor α9 detects that the combustion of the generated gas has stopped. Alternatively, when the VC detects that the reduction has been reduced, the VC returns to step (II) t, restarts combustion in the auxiliary combustion gas header (6), and detects the sensor αη.
When it is detected that the control valve/flow control valve (9) has been closed, the control is terminated.

Also in the step width, the first gas sensor θ1),
Continuing to monitor the status of the first flame sensor OQ and sensor ση, when the first gas sensor α detects that the gas pressure in the inlet pipe (4) has decreased to a certain level, which is likely to cause a reverse downward phenomenon. returns to step (Vl) and waits until the gas pressure becomes sufficiently high, and if @l flame sensor aQ detects that the concentration of the generated gas has become high and sufficient combustion has started, the process returns to step iv. ) to stop the combustion of the auxiliary combustion gas header (6), and
Sensor Q7) serves as the original valve and flow control valve (9)
If it is detected that ft is closed, the control is terminated.

By adopting the above control configuration, it is possible to reliably prevent the flashback phenomenon during combustion of generated gas, as in each of the above-mentioned embodiments, and when the generated gas is within a sufficiently flammable range, it is possible to provide a combustion-assisting effect. In addition, when the combustion of both the generated scum and the auxiliary combustion gas has stopped, the operation of the fan (2) will be automatically stopped.
This resulted in an extremely energy-saving product.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram for explaining a processing system with a conventional configuration. Figures 2 to 6 A) and Naka) show embodiments of the apparatus for treating generated gas in landfills, etc., according to the invention,
Figure 2 is a schematic configuration diagram of the principle embodiment, Figures 8 and 4.
The figure shows a schematic configuration diagram of an applied example and its modified example, FIG. It is a flow chart for explanation. (4)---Generated gas introduction pipe, (5)------
Generated gas combustor n, an... valve, αυ...
····sensor.

Claims (1)

[Claims] In Koma r#, which is configured to treat gas generated in a garbage disposal site, etc. by supplying it to a combustion appliance (5) through a generated gas introduction pipe (4) and burning it,
A sensor θυ is provided to detect the gas pressure and gas flow rate in the generated gas introduction pipe (4) to the combustion appliance (5), and the gas pressure tfC detected by the sensor (1υ) is determined when the gas flow rate is below a predetermined value. A processing device for generated gas in a landfill or the like, characterized in that a groove is provided to automatically open and close a valve (If) interposed in the generated gas introduction pipe (4) at certain times. .