KR200495182Y1 - Landfill gas capture methane concentration control system - Google Patents

Abstract

A landfill gas collection methane concentration control system according to the present invention includes a plurality of collection flow control devices installed adjacent to a gas collection flow control valve installed in each landfill gas collection hole and a connection part of a landfill gas collection induction pipe to control the collection of landfill gas, and the It may include a central management device that is wirelessly connected to the plurality of collection flow control devices to control the operation of the plurality of collection flow control devices. At this time, each of the plurality of collection flow control device includes a support installed adjacent to the collection hole; a solar panel installed on the support to generate driving power; a pre-processing unit for pre-processing and discharging the sample gas collected from the collection hole; a sensing unit for measuring the methane concentration of the sample gas; a wireless communication unit for transmitting the methane concentration of the sample gas to the management device; control unit; a sealed case installed under the solar panel on the support and accommodating the pre-processing unit, the sensing unit, the wireless communication unit, and the control unit; It may include a valve driving unit connected to the wireless communication unit and installed on the collection flow control valve.

Description

Landfill gas capture methane concentration control system

The present invention relates to a landfill gas collection methane concentration control system, and more specifically, based on the concentration of methane gas measured by a plurality of gas collection control devices installed in a plurality of landfill gas collection holes, a plurality of landfill gases remotely It relates to a landfill gas capture methane concentration control system capable of reaching an appropriate methane concentration by controlling the amount of landfill gas collection in a collection hole.

In general, the organic waste treatment method in landfills consists of repeating the process of stacking wastes, covering the soil layer, then stacking wastes on top of them and covering the soil layer. . In the process of natural decomposition of organic waste, landfill gas (LFG) is generated and naturally released from the underground to the atmosphere.

Therefore, the landfill gas collection hole is installed in the landfill site to artificially collect the landfill gas generated in the basement of the landfill site, thereby preventing the risk of fire or explosion and odor, and the captured landfill gas is used as a fuel resource. Landfill gas is composed of methane (CH ₄ ), carbon dioxide (CO ₂ ), nitrogen (N ₂ ), oxygen (O ₂ ), hydrogen (H ₂ ), water vapor (H ₂ 0) and other gas components.

Among them, methane can be used as a very good fuel, and the concentration of methane captured by landfill gas fluctuates in inverse proportion to the amount of gas collected. Increasing the amount of landfill gas will lower the concentration of methane, and decreasing the amount of landfill gas will increase it. The degree varies according to time depending on various environmental factors (water content, PH, atmospheric pressure, etc.) for each collection hole.

The concentration of captured methane in landfill gas that can utilize landfill gas most effectively is 40% to 50%, and the methane concentration in this range can be called the appropriate concentration of captured methane. Therefore, it can be said that it is very important to maintain the gas collection amount while maintaining the proper landfill gas methane concentration in the landfill gas fuel resource conversion.

A landfill gas collection induction pipe capable of suctioning and collecting landfill gas with negative pressure is connected to the plurality of collection holes, and a control valve is installed to control the collection amount by transmitting the suction sound pressure amount to each collection hole.

The manager of the landfill management institution measures the methane concentration of the landfill gas one by one for each of the plurality of collection holes to obtain the gas collection amount while maintaining the appropriate concentration of methane, and if the measured methane concentration is higher than the appropriate concentration, the The gas collection amount manual control valve is opened further to increase the gas collection amount, and from this point on, the methane concentration gradually decreases. After reducing the amount of gas captured, the methane concentration will gradually increase from this point on, and the manager can repeat this process one by one to obtain a sufficient amount of landfill gas capture while maintaining the appropriate methane concentration.

In this way, if the manager manages all the collecting holes one by one, it takes a lot of time and money, so economic efficiency cannot be high. There are problems that we have to deal with.

Therefore, the technical problem to be solved by the present invention is to ensure that the administrator can automatically measure the methane concentration of landfill gas without inspecting a plurality of trapping holes, and compare the value with the appropriate value of the methane concentration to maintain the appropriate concentration of methane. It is to provide an efficient landfill gas capture methane concentration control system that can maintain the landfill gas capture methane concentration constant by controlling the opening degree of the gas collection flow rate automatic control valve.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. will be able

The landfill gas collection methane concentration control system according to the present invention for solving the above technical problem is installed adjacent to the gas collection flow control valve installed in each landfill gas collection hole and the landfill gas collection induction pipe connection part to control the landfill gas collection a plurality of collection controls; and a central management unit wirelessly connected to the plurality of collection control devices to control operations of the plurality of collection control devices.

Each of the plurality of collection control device, the support installed adjacent to the collection hole; a solar panel installed on the support to generate driving power; a pre-processing unit for pre-processing and discharging the sample gas collected from the collection hole; a sensing unit for measuring the methane concentration of the sample gas; a wireless communication unit for transmitting the methane concentration of the sample gas to the management device; control unit; a sealed case installed under the solar panel on the support and accommodating the pre-processing unit, the sensing unit, the wireless communication unit, and the control unit; It may include a valve driving unit connected to the wireless communication unit and installed on the collection control valve.

The control unit, in response to a control signal received from the management device through the wireless communication unit, if the methane concentration of the sample gas is less than an appropriate concentration, to further close the opening degree of the collection flow control valve, the methane concentration of the sample gas is When the concentration is higher than the appropriate concentration, the valve driving unit may be remotely controlled to further open the opening of the collection flow control valve in order to collect the landfill gas through the main pipe.

The pre-processing unit, a first filter for calibration air; a second filter for removing moisture and impurities from the sample gas; a suction pump provided between the first and second filters and the sensing unit; and a selection valve selectively connecting the first and second filters to the suction pump. In this case, the controller may control the selection valve to connect the first filter to the suction pump in the calibration mode and to connect the second filter to the suction pump in the measurement mode.

The sensing unit may measure the methane concentration of the sample gas in a non-dispersive infrared (NDIR) method. In this case, the pre-processor may further filter at least one gas having an infrared absorption wavelength region overlapping with an infrared absorption wavelength region of methane from the sample gas in order to improve the measurement accuracy of the methane concentration of the sample gas, and the landfill gas Filters moisture and fine dust particles contained in

The control unit drives the suction pump to supply the sample gas to the sensing unit after entering the measurement mode, and continuously operates the suction pump to supply the calibration air to the sensing unit while discharging the sample gas even after completing the measurement mode can be driven by

The landfill gas collection methane concentration control system according to the present invention actively controls the entire process of landfill gas collection by controlling the collection flow rate through the pressure delivered to each individual collection hole based on the methane gas concentration of a plurality of collection holes installed in the landfill. Being able to control it is a big plus.

As described above, since each collecting hole has a different state, it means that gas can be collected efficiently and stably according to the state of each collecting hole. Therefore, this method can not only contribute to the improvement of the quality of the landfill gas collected, but also the status of individual collection holes can be monitored in real time because the numerical value is immediately transmitted to the manager.

In addition, the landfill gas capture methane concentration control system according to the present invention can realize high economic feasibility because the manager does not need to check all the collecting holes individually, and the manager can implement the hazardous waste discharged to the ground from the collecting wells or landfills other than the collecting holes. It can provide an effect that can block the risk of exposure to the gas.

1 is an installation state diagram of a collection control device 100 included in a landfill gas collection methane concentration control system 10 according to the present invention.
2 is a block diagram of the landfill gas capture methane concentration control system 10 according to the first embodiment of the present invention.
3 is a block diagram of a landfill gas capture methane concentration control system 10 according to a second embodiment of the present invention.
4 is an operation timing diagram of the landfill gas capture methane concentration control system 10 according to the present invention.

In order to fully understand the present invention and the operational or functional advantages of the present invention and the purpose achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. The same reference numerals provided in the respective drawings may refer to the same members.

1 is an installation state diagram of a collection control device 100 included in a landfill gas collection methane concentration control system 10 according to the present invention. 2 is a block diagram of the landfill gas capture methane concentration control system 10 according to the first embodiment of the present invention. 3 is a block diagram of a landfill gas capture methane concentration control system 10 according to a second embodiment of the present invention.

The landfill gas capture methane concentration control system 10 may include a plurality of capture control devices 100 and a central management device 200 . The plurality of collection control devices 100 are installed adjacent to the plurality of collection holes 20 in which the collection flow control valve 30 installed in the landfill gas collection induction connection pipe is installed to collect the landfill gas from the collection holes 20 . to control Meanwhile, only one collection control device 100 for one collection hole 20 is illustrated in the drawings for simplification and convenience of explanation.

The central management device 200 may be wirelessly connected to the collection control device 100 to control the operation of the collection control device 100 . Of course, the collection control device 100 may perform an operation/function related to the collection of the landfill gas by itself without being controlled by the central management device 200 . The wireless communication method in which the central management device 200 and the collection control device 100 are connected may be NB-IoT, Lora, etc., but the scope of the present invention is not limited thereto.

The collection control device 100 includes a support 110 , a solar panel 120 , a case 130 , a valve actuator 140 , a preprocessor 150 , a sensing unit 160 , a collection control device 100 and and a wireless communication unit 180 . On the other hand, since the components of the collection control apparatus 100 shown in FIGS. 1 to 3 are not essential, the collection control apparatus 100 may have more or fewer components. Hereinafter, each component will be described in more detail.

The support 110 is installed on a foundation buried underground and has a pipe shape protruding to the ground. The photovoltaic panel 120 is installed above the support 110 , and the photovoltaic panel 120 generates driving power of the collection control device 100 and supplies it to each component.

In the support 110 , the case 130 is installed under the solar panel 120 , and the case 130 is sealed and basically provides a waterproof function. In addition, the preprocessor 150 , the sensing unit 160 , the control unit 170 , and the wireless communication unit 180 are accommodated in the case 130 . However, the antenna 181 of the wireless communication unit 180 may protrude to the outside of the case 130 in order to smoothly perform wireless communication.

The valve driving unit 140 may be installed in the collection control valve 30 of the collection hole 20 . The valve driving unit 140 may perform wireless communication with the wireless communication unit 180 , and based on the methane concentration of the landfill gas measured by the sensing unit 160 under the control of the control unit 170 , the first valve The degree of opening of the collection flow control valve 30 may be determined in response to the control signal.

The first valve control signal may be a wireless control signal generated by the control unit 170 . Transmission of the first valve control signal may be made according to a wireless communication method such as Bluetooth, Zigbee, or Wi-Fi, but the scope of the present invention is not limited thereto.

The pre-processing unit 150 may pre-process the sample gas collected from the collection hole 20 and discharge it to the sensing unit 160 . As shown in FIG. 2 , the preprocessor 150 may include a first filter 151 , a second filter 152 , a selection valve 153 , and a suction pump 154 .

The first filter 151 performs filtering for supplying calibration air to the sensing unit 160 . The second filter 152 filters moisture or impurities from the sample gas. Meanwhile, the second filter 152 may further perform filtering of a specific gas component in order to improve the measurement accuracy of the methane concentration of the sensing unit 160 . Of course, the pre-processing unit 150 may further include other components for filtering a specific gas component in order to improve measurement accuracy.

The selection valve 153 may selectively connect the first filter 151 or the second filter 152 to the suction pump 154 according to the operation mode of the sensing unit 160 . The selection valve 153 may be driven in response to a second valve control signal generated by the control unit 170 .

The suction pump 154 is provided between the first filter 151 and the second filter 152 and the suction pump 154 for calibration air filtered by the sensing unit 160 or filtered sample gas for measurement may be supplied to the sensing unit 160 . Whether the suction pump 154 is driven may be determined by a pump control signal generated by the control unit 170 .

Meanwhile, the pre-processing unit 150 may further include an automatic drainage unit 155 and a flow meter 156 as shown in FIG. 3 . The automatic drainage unit 155 may automatically discharge moisture or impurities that may be generated inside the pre-processing unit 150 to the outside. The flow meter 156 may measure the volume of the gas supplied to the sensing unit 160 .

The sensing unit 160 may measure the concentration of methane (CH ₄ ) in the sample gas supplied through the second filter 152 , the selection valve 153 , and the suction pump 154 in the measurement mode. there is. Before that, the sensing unit 160 performs a calibration mode to perform a calibration function using the calibration air supplied through the first filter 151, the selection valve 153, and the suction pump 154. can

In the sensing unit 160 , suction and discharge of the internal gas must be performed according to the calibration mode and the measurement mode, and such control may be performed by the control unit 170 .

The sensing unit 160 may measure the methane concentration of the sample gas in a non-dispersive infrared (NDIR) method. At this time, the preprocessor 150 may further filter at least one gas having an infrared absorption wavelength region overlapping with an infrared absorption wavelength region of methane from the sample gas in order to improve the measurement accuracy of the methane concentration of the sample gas. there is. This may be performed by the second filter 152 or, although not shown in the drawings, may be performed by a component other than the second filter 152 .

Representative examples of the gas in which methane and the infrared absorption wavelength region overlap may include ethane (C ₂ H ₆ ) and propane (C ₃ H ₈ ) having a CH molecular structure, such as methane. In general, landfill gas contains a small amount of these gases, but since these gases have a much higher infrared absorption capacity than methane, it is possible to increase the measurement error of the methane concentration of the sensing unit 160, the pre-processing unit 150 It is preferable to filter in

The control unit 170 may control the overall operation of the collection control device 100 . The collection control device 100 may generate control signals for controlling each component of the collection control device 100 . The control unit 170 may control the wireless communication unit 180 to perform wireless communication with the central management device 200 and the valve actuator 140 .

When the methane concentration measurement value is transmitted from the sensing unit 160, the controller 170 may control the opening degree of the collection control valve 30 according to a first valve control signal generated based on the methane concentration. there is. The first valve control signal may be generated by the control unit 170 itself. And the measured methane concentration value can be transmitted through serial communication. However, the scope of the present invention is not limited thereto.

Meanwhile, the control unit 170 may transmit the measured methane concentration to the central management apparatus 200 , and may receive the first valve control signal from the central management apparatus 200 . In both cases, the first valve control signal may be wirelessly transmitted to the valve driving unit 140 , and the valve driving unit 140 responds to the first valve control signal to the collection flow rate control valve 30 . The degree of opening can be controlled.

Hereinafter, specific examples in which the control unit 170 remotely and wirelessly controls the collection flow rate control valve 30 through the first valve control signal according to the methane concentration of the sample gas will be described.

The control unit 170 may further close the opening degree of the collection control valve when the methane concentration of the sample gas is less than an appropriate concentration. If the methane concentration of the landfill gas is less than the appropriate concentration, it is because there is a quality problem in using it as a fuel source. However, if the methane concentration of the sample gas is higher than the appropriate concentration, since the gas collection amount can be further increased, the control unit 170 controls the collection flow rate control valve 30 to collect the landfill gas through the landfill gas collection induction connection pipe. ) to further open the opening degree of the valve driving unit 140 can be remotely controlled. Accordingly, the control unit 170 may adjust the opening degree of the collection flow rate control valve 30 according to the methane concentration of the sample gas.

For example, more efficient collection of landfill gas may be possible by adjusting the gas collection flow rate control valve in consideration of the methane gas formation rate in the basement of the landfill. Of course, in this case, it is preferable that the methane gas formation rate in the basement of the landfill is calculated or predicted in advance through long-term analysis. This is preferably done by the central management device 200 . The central management unit collects the data of individual collection wells along with the control role of the system, and the manager can predict the amount of landfill gas collection and methane concentration based on the data.

As described above, the landfill gas collection methane concentration control system 10 according to the present invention remotely automatically controls the amount of landfill gas collection based on the methane gas concentration of the plurality of collection holes 20 installed in the landfill. It is possible to produce landfill gas that can be used as a resource. Therefore, the landfill gas collection methane concentration control system 10 according to the present invention can realize high economic efficiency because the manager does not need to check all the collection holes one by one. In addition, according to the landfill gas capture methane concentration control system 10 according to the present invention, the risk that the manager is exposed to the harmful gas discharged to the ground from the collection hole or landfill other than the collection hole can be prevented.

4 is an operation timing diagram of the landfill gas capture methane concentration control system 10 according to the present invention. Hereinafter, the operation timing diagram will be described with reference to the necessary drawings.

In a state in which the sample gas filtered by the second filter 152 is supplied to the sensing unit 160, the control unit 170 controls the sensing unit 160 to measure the methane concentration of the sample gas through a measurement control signal. . In this case, the control unit 170 controls the suction pump 154 to supply the sample gas through the pump control signal.

When the measurement of the methane concentration in the sensing unit 160 is completed, the control unit 170 controls the sensing unit 160 to discharge the gas in the sensing unit 160 to the outside through an emission control signal. At this time, the control unit 170 supplies the calibration air to the inside of the sensing unit 160 while operating the suction pump 154 . This may be for calibration of the sensing unit 160 to be performed in the future.

On the other hand, when the measurement of the methane concentration in the sensing unit 160 is completed, the sensing unit 160 transmits the measurement result of the methane concentration to the control unit 170 . Then, the collection control device 100 generates a first valve control signal for controlling the degree of opening of the collection flow control valve 30 based on the received measurement result of the methane concentration and transmits it to the valve actuator 140 . there is. Control of the collection flow control valve 30 according to the first valve control signal has been described above, and thus a detailed description thereof will be omitted.

Looking at the operation timing diagram discussed above, the collection control device 100 drives the suction pump to supply the sample gas to the sensing unit 160 after entering the measurement mode, and after completion of the measurement mode, the sensing unit It can be seen that the suction pump 154 is continuously driven to supply calibration air to the sensing unit 160 while discharging the sample gas at step 160 . Accordingly, before the next measurement, the sensing unit 160 may be supplied with calibration air in advance. That is, the collection control device 100 completes preparations for performing the calibration mode as soon as the measurement mode is completed.

Although not shown in FIG. 4 , after the above-described processes are performed, and after a certain period of time has elapsed according to the inspection cycle, the control unit 170 directly calibrates the sensing unit 160 to which the calibration air is supplied. can do. This is possible because, as described above, the suction pump 154 is continuously driven from the methane concentration measurement process to supply calibration air to the sensing unit 160 .

As described above, the collection control device 100 according to the present invention repeatedly performs the above-described process at a predetermined cycle. The degree of opening of the collection flow control valve 30 that determines the degree of gas collection may be determined.

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited to the above-described embodiments, and various modifications and variations from these descriptions are provided by those skilled in the art to which the present invention pertains. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the utility model claims to be described later as well as the utility model claims and equivalents.

10: landfill gas collection methane concentration control system 20: collection hole
30: gas collection flow control valve 100: collection control device
110: support 120: solar panel
130: case 140: valve driving unit
150: preprocessor 151: first filter
152: second filter 153: selection valve
154: suction pump 155: automatic drain unit
156: flow meter 160: sensing unit
170: control unit 180: wireless communication unit
181: wireless antenna 200: central management unit

Claims (5)

a plurality of collection control devices installed adjacent to the gas collection flow control valve installed in each of the landfill gas collection holes and the connection part of the landfill gas collection induction pipe to control the collection of the landfill gas; and a central management device wirelessly connected to the plurality of collection control devices to control operations of the plurality of collection control devices,
Each of the plurality of collection control devices,
a pre-processing unit for pre-processing and discharging the sample gas collected from the collection hole; a sensing unit for measuring the methane concentration of the sample gas in a non-dispersive infrared (NDIR) method; a wireless communication unit for transmitting the methane concentration of the sample gas to the management device; It includes a valve driving unit and a control unit,
The control unit is
In response to a control signal received from the management device through the wireless communication unit, remote control of the valve driving unit to adjust the opening of the gas collection flow control valve,
The preprocessor is
a first filter for calibration air; a second filter for removing moisture and impurities from the sample gas; a suction pump provided between the first and second filters and the sensing unit; and a selection valve selectively connecting the first and second filters to the suction pump,
The second filter is
In order to improve the measurement accuracy of the methane concentration of the sample gas, ethane and propane having a CH molecular structure having an infrared absorption wavelength region overlapping with that of methane from the sample gas and having a higher infrared absorption capacity than methane were added. Characterized in the filtering, landfill gas capture methane concentration control system.
According to claim 1, wherein the control unit,
In response to the control signal, if the methane concentration of the sample gas is greater than or equal to the appropriate concentration, the collection flow control valve is opened, and the valve driving unit is configured to adjust the opening degree of the collection flow control valve according to the methane concentration of the sample gas. Landfill gas capture methane concentration control system, characterized in that the remote control.
delete delete According to claim 1, wherein the control unit,
After entering the measurement mode, the suction pump is driven to supply the sample gas, and after the measurement mode is completed, the suction pump is continuously driven to supply the calibration air to the sensing unit while discharging the sample gas. , Landfill gas capture methane concentration control system.

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