Landfill leachate biogas measurement and control device and landfill leachate explosion-proof intelligent monitoring system

Abstract

The utility model provides a landfill leachate biogas measurement and control device and a landfill leachate anti-explosion intelligent monitoring system, and belongs to the technical field of anti-explosion. The utility model relates to a landfill leachate biogas measurement and control device. The landfill leachate biogas measurement and control device comprises a potential difference detection instrument which is arranged at the contact part of all electric appliance shells and metal parts in a landfill leachate treatment system and is used for detecting the potential difference between the metal parts of a leachate water storage tank and biogas; the combustible gas measuring instrument is arranged at the biogas generation part of the leachate storage tank and is used for detecting the biogas concentration; the ventilation structure is arranged at the biogas gathering space and is used for reducing the biogas concentration; and the biogas conveying test instrument is arranged on the biogas conveying pipeline and is used for testing the flow or pressure of the biogas. The beneficial effects of the utility model are that: can realize the biogas concentration monitoring and electrostatic state monitoring of whole-flow biogas gathering area, and the security is higher.

Description

Technical Field

[0001] The utility model relates to a display screen structure, in particular to an intelligent monitoring system for preventing explosion accidents of garbage leachate and biogas. Background Art

[0002] At present, in the waste incineration power generation project, the collection, transportation, purification and treatment of leachate in the process of stacking garbage in the garbage storage will produce methane, among which the garbage leachate collection pool and treatment station are the most prominent.

[0003] The leachate in the large pools of the leachate treatment station process contains a large amount of organic matter. During the storage and disposal process, these organic substances are fermented by microorganisms in an anaerobic environment under certain temperature, humidity, and pH conditions to produce a combustible gas, that is, a large amount of methane CH4, carbon dioxide CO2 and hydrogen H2 gas will be produced in the anaerobic digestion process, commonly known as "biogas", which is particularly prominent in the regulating pool. The leachate itself will not burn or explode, but when the biogas it produces is mixed with air (mainly oxygen), and the biogas reaches a certain concentration, and there is an ignition source such as open flames, static electricity, lightning, etc., it may explode. The biogas concentration generally ranges from 4.9 to 16% by volume.

[0004] For biogas to explode, three conditions must be met: first, the volume concentration of methane mixed with air is within the explosion range; second, the oxygen in the air and the biogas are in a mixed state; and third, there is an ignition source such as open flame or static electricity.

[0005] The methane in the leachate can explode, and the accidents are usually serious, ranging from equipment damage to death. At present, there is no good solution for intelligent monitoring of the entire process. Some factories may simply install combustible gas detection instruments for concentration detection. In the actual production process, the oxygen in the air cannot be controlled to enter, and other restrictive measures such as nitrogen replacement of air are too expensive and technically difficult. The detonation source can be minimized through technical and management means, but some static electricity cannot be completely avoided. Therefore, the existing technology still has the risk of explosion. Utility Model Content

[0006] In order to solve the problems in the prior art, the utility model provides a garbage leachate biogas measurement and control device, and also provides a garbage leachate explosion-proof intelligent monitoring system comprising the garbage leachate biogas measurement and control device.

[0007] The utility model comprises a landfill leachate biogas measuring and controlling device comprising a potential difference detecting instrument, which is arranged at the contact points between all electrical appliance casings and metal parts in the landfill leachate treatment system and is used to detect the potential difference between the metal parts of the leachate storage tank and the biogas; a combustible gas measuring instrument: which is arranged at the biogas generating point of the leachate storage tank and is used to detect the biogas concentration; a ventilation structure: which is arranged at the biogas gathering space and is used to reduce the biogas concentration; and a biogas transportation testing instrument: which is arranged on the biogas transportation pipeline and is used to test the flow rate or pressure of the biogas.

[0008] The utility model is further improved in that the ventilation structure includes ventilation equipment arranged on one side of the leachate storage tank and / or exhaust equipment arranged on the other side of the leachate storage tank.

[0009] The utility model is further improved in that the ventilation structure also includes a sealed explosion-proof door that can be remotely controlled to open for ventilation.

[0010] The utility model is further improved, the garbage leachate treatment system includes a garbage storage, a garbage storage leachate collection pool, a leachate treatment station, and a collection corridor arranged between the garbage storage and the garbage storage leachate collection pool, a leachate delivery pipeline arranged between the garbage storage leachate collection pool and the leachate treatment station, and a biogas delivery pipeline arranged between the biogas outlet of the leachate treatment station and the biogas collection port of the garbage storage.

[0011] There are multiple potential difference detection instruments and combustible gas measuring instruments, which are respectively arranged in the garbage leachate treatment system including the garbage storage, the garbage storage leachate collection pool, the leachate treatment station, the collection corridor, and the leachate delivery pipeline. There are multiple ventilation structures, which are respectively arranged in the garbage storage leachate collection pool, the leachate delivery pipeline, and the leachate treatment station. The biogas delivery test instruments are respectively arranged in the garbage storage leachate collection pool and the leachate treatment station.

[0012] The utility model is further improved in that the primary air intake of the garbage storage and the collection gallery at the bottom of the garbage storage are both provided with combustible gas measuring instruments, and the number of combustible gas measuring instruments in the collection gallery is more than one, and they are dispersedly arranged at set intervals.

[0013] The biogas transmission pipeline is provided with a number of combustible gas measuring instruments, and all electrical enclosures and metal parts in contact are provided with potential difference detection instruments.

[0014] The leachate delivery pipeline is provided with part or all of a combustible gas measuring instrument, an air blower and a potential difference detection instrument, wherein a biogas collection bag is provided on the upper part of the leachate delivery pipeline, the combustible gas measuring instrument is arranged on the biogas collection bag and is connected with the biogas in the biogas collection bag, the air blower is used to supply air into the leachate delivery pipeline, and the potential difference detection instrument is arranged at the connection point between all electrical housings and metal parts.

[0015] The utility model is further improved and further comprises an inerting device, wherein the inerting device is arranged in a confined space of the garbage leachate treatment system or in a pipeline that is prone to generate biogas.

[0016] The utility model is further improved, the leachate collection tank is provided with a plurality of flammable gas measuring instruments, a potential difference detection instrument, a biogas transport test instrument and / or an explosion-proof exhaust fan, wherein:

[0017] The combustible gas measuring instruments are arranged at intervals on the top of the leachate collection tank to detect the accumulation of biogas in different areas. The biogas transportation test instrument and the explosion-proof exhaust fan are both arranged on the top of the leachate collection tank. The explosion-proof exhaust fan is arranged at the primary air intake port which sucks in air from above the leachate collection tank and sends it to the garbage storage through a pipeline. The potential difference detection instrument is arranged at the contact point between all electrical housings and metal parts of the leachate collection tank.

[0018] The utility model is further improved, the leachate treatment station is provided with a sedimentation tank, a regulating tank, and an anaerobic sedimentation tank connected by pipelines, wherein the sedimentation tank, the regulating tank, and the anaerobic sedimentation tank are all provided with a combustible gas measuring instrument, an exhaust fan, a biogas transport test instrument, a potential difference detection instrument, and a blower.

[0019] The biogas transportation test instrument comprises a gas flow meter and a negative pressure measuring instrument, wherein the negative pressure measuring instrument is arranged at the inlet of the sedimentation tank, the regulating tank and the anaerobic sedimentation tank, and the gas flow meter is arranged at the outlet of the sedimentation tank, the regulating tank and the anaerobic sedimentation tank.

[0020] The sedimentation tank, regulating tank and anaerobic sedimentation tank are also provided with sealed explosion-proof doors which can be opened and closed remotely.

[0021] The utility model is further improved to further include an infrared monitoring instrument, which is arranged in the flammable and explosive area of ​​biogas in the leachate collection pool of the garbage depot and the leachate treatment station.

[0022] The utility model also provides an explosion-proof intelligent monitoring system for landfill leachate, including the landfill leachate biogas measurement and control device, and also including an intelligent detection and control center and a human-machine interface, wherein the intelligent detection and control center is used to collect information from the landfill leachate biogas measurement and control device and control the landfill leachate biogas measurement and control device, and the human-machine interface is connected to the intelligent detection and control center to realize information transmission and command issuance.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] The utility model can draw the attention of relevant personnel and deal with hidden dangers in advance by monitoring and systematically monitoring the parameters of the three elements that produce explosions - combustible biogas, combustion-supporting oxygen, and the mixed concentration of biogas in the detonation source in the air, monitoring the static electricity of metal in contact with the biogas, and sending and recording various real-time parameters, early warnings, alarms and other information. At the same time, it can automatically control the relevant equipment for reducing the biogas concentration, and together effectively cut off the initial conditions for the explosion, thereby greatly improving the safety of the entire landfill leachate treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the utility model garbage leachate explosion-proof intelligent monitoring system;

[0026] Figure 2 This is a schematic structural diagram of an embodiment of a garbage leachate biogas measurement and control device of the utility model;

[0027] Figure 3 This is a schematic diagram of an explosion-proof intelligent monitoring processing method according to an embodiment of the utility model. DETAILED DESCRIPTION

[0028] The utility model is further described in detail below with reference to the accompanying drawings and embodiments.

[0029] The leachate from a waste incineration plant or landfill contains a large amount of organic matter. During storage, transportation and disposal, especially in the leachate collection and regulation tank, the organic matter in an anaerobic environment, under certain temperature, humidity and pH conditions, produces a large amount of methane CH4, carbon dioxide CO2 and a small amount of hydrogen H2 gas through microbial fermentation, commonly known as "biogas". When biogas is mixed with oxygen and reaches a certain concentration, it will explode when ignited by open flames, static electricity or lightning. There are cases of explosions in many waste incineration or landfill plants across the country, some in the leachate collection tank under the garbage storage, some in the biogas transmission pipeline, and some in the regulation tank of the leachate treatment station. The consequences of the explosion range from damage to equipment and facilities to multiple casualties. The cause of the static flash explosion cannot be traced at all, and reasoning can only be based on the phenomenon.

[0030] In order to further prevent the occurrence of such explosion accidents, the utility model creatively invents an intelligent explosion-proof monitoring system for landfill leachate to avoid biogas explosion accidents. The utility model monitors the parameters of the mixed concentration of biogas in the air among the three elements that produce explosions (combustible biogas, combustion-supporting oxygen, and detonation source), systematically monitors the static electricity of metals in contact with biogas, sends and records various real-time parameters, early warnings, alarms and other information, which can attract the attention of relevant personnel and deal with hidden dangers in advance. At the same time, the control method of the relevant equipment that automatically controls the reduction of biogas concentration can effectively cut off the initial conditions of the explosion, thereby greatly improving the safety of the entire landfill leachate treatment system.

[0031] like Figure 1 As shown, the utility model garbage leachate explosion-proof intelligent monitoring system is mainly divided into three parts: a garbage leachate biogas measurement and control device set up at the garbage leachate treatment system site, an intelligent detection and control center for remote collection and control, and a human-machine interface connected to the remotely controlled intelligent detection and control center. Each part is described in detail below.

[0032] 1. Garbage leachate biogas measurement and control device

[0033] like Figure 1 As shown, the landfill leachate biogas measurement and control device of this example includes:

[0034] The potential difference detection instrument is installed at the contact point between all electrical housings and metal parts in the landfill leachate treatment system. It is used to detect the potential difference between the metal parts of the leachate storage tank and the biogas. In this case, an electrostatic collection instrument can be used, such as an intrinsically safe electrostatic detection instrument.

[0035] Combustible gas measuring instrument: installed at the biogas generating point of the leachate storage tank to detect the biogas concentration. In this case, special instruments such as explosion-proof biogas concentration collection instruments can be used;

[0036] Ventilation structure: It is installed in the biogas accumulation space to reduce the biogas concentration. For example, exhaust fans or ventilators are installed in the biogas accumulation space, as well as suction fans with flammable gas transportation, sealed explosion-proof doors that automatically open for ventilation, and blowers with forced air supply.

[0037] Biogas transportation test instrument: installed on the biogas transportation pipeline, used to test the flow or pressure of biogas, such as pressure gauges, flow meters and other special instruments installed on the pipeline.

[0038] like Figure 2As shown, as an embodiment of the utility model, the garbage leachate treatment system described in this example includes a garbage storage, a garbage storage leachate collection pool, a leachate treatment station, and a collection corridor arranged between the garbage storage and the garbage storage leachate collection pool, a leachate delivery pipeline arranged between the garbage storage leachate collection pool and the leachate treatment station, and a biogas delivery pipeline arranged between the biogas outlet of the leachate treatment station and the biogas collection port of the garbage storage.

[0039] The leachate produced by the natural fermentation of the garbage piled in the garbage storage flows into the leachate collection pool through the collection corridor, and then is transported to the sedimentation tank of the leachate treatment station through the pump pipeline, and then flows into the regulating tank, and then flows into the anaerobic sedimentation tank after passing through the reactor. In this process, the leachate will produce biogas, and its production is proportional to the amount of leachate and the residence time. Since biogas is lighter than air and its gas density is slightly less than that of air, the biogas naturally precipitated from the leachate mixes with air and accumulates at the top of the space. As time and output increase, a high-concentration mixed gas will be formed. If the volume ratio of biogas reaches 8.6-20.8%, an explosive mixed gas will be formed, and once it encounters an open flame or static electricity, it will explode. Therefore, in order to prevent the explosion, there are two measures: one is to prevent the biogas concentration from being too high and ensure that it is outside the explosion limit of 4.9-15.4%; the second is to effectively prevent static electricity.

[0040] According to the above principle, the utility model on-site garbage leachate biogas measurement and control device is mainly configured as follows:

[0041] (1) A combustible gas measuring instrument is installed at the primary air intake of the garbage storage to mainly detect the trend of biogas changes;

[0042] (2) The leachate collection corridor at the bottom of the garbage storage is equipped with combustible gas measuring instruments at intervals (usually 3 to 5 meters, mainly determined by the distance between the main beams) to detect the accumulation of methane in sections;

[0043] (3) A combustible gas measuring instrument is installed at intervals (mainly based on the convex space formed between the beams) on the top of the leachate collection pool at the bottom of the garbage storage to detect the accumulation of biogas in different areas. Generally, an extraction measurement method is used to reduce maintenance workload;

[0044] (4) A negative pressure measuring instrument is installed on the top of the leachate collection pool at the bottom of the garbage storage. Generally, it is required to maintain a negative pressure of -10 to -15 Pa. On the one hand, it detects the internal air replacement capacity, and on the other hand, it prevents the internal odor from escaping and affecting the factory environment;

[0045] (5) An explosion-proof exhaust fan is installed in the leachate collection pool at the bottom of the garbage storage, sucking air from the air above the collection pool and sending it to the primary air intake through the pipeline; this exhaust fan can receive operating instructions from the control center;

[0046] (6) All electrical housings and metal parts in the leachate chamber at the bottom of the garbage storage are connected to an electrostatic detection instrument to measure their potential difference in real time;

[0047] (7) When the leachate delivery is stopped, part of the leachate delivery pipeline from the leachate pool to the leachate treatment station will form an empty pipe. A biogas collection bag will be added at its high point, and a combustible gas measuring instrument will be installed. At the same time, a blower will be installed, and this blower can receive the operation instructions from the control center. All electrical housings and metal parts will be connected to static electricity detection instruments to measure their potential differences in real time.

[0048] (8) Multiple combustible gas measuring instruments shall be installed in the sedimentation tank, regulating tank, anaerobic sedimentation tank and other areas where biogas is likely to accumulate in the leachate treatment station; each tank shall be equipped with an exhaust fan, a negative pressure measuring instrument shall be installed at its inlet, and a gas flow meter shall be installed at its outlet; each tank shall be equipped with a blower; each tank shall be equipped with a sealed explosion-proof door that can be opened remotely;

[0049] (9) All electrical enclosures and metal parts of the above-mentioned pools at the leachate treatment station are connected to electrostatic detection instruments to measure their potential differences in real time;

[0050] (10) Install multiple combustible gas measuring instruments every 10 to 20 meters or at high points where biogas is likely to accumulate in the horizontal section of the biogas pipeline from the leachate treatment station to the garbage pit station; connect all electrical housings and metal parts to electrostatic detection instruments to measure their potential differences in real time.

[0051] Preferably, in this example, infrared monitoring instruments can also be installed in the leachate receiving pool and leachate regulating pool of the garbage storage to monitor the temperature and fire conditions of these flammable and explosive areas of biogas, and connect to the intelligent control system for information exchange; in confined spaces or pipelines prone to biogas production, inert gas filling devices are installed to fill inert gas and accept remote automatic control.

[0052] The above-mentioned electrostatic meters, biogas detection instruments, pressure gauges, flow meters, blowers, exhaust fans, sealed explosion-proof doors and other on-site measuring instruments, detection information and operating status of the controlled equipment all exchange data with the intelligent detection and control center; the controlled equipment can receive control instructions from the intelligent detection and control center.

[0053] 2. Intelligent detection and control center

[0054] The intelligent detection and control center is the brain center of the utility model for important information processing and command calculation and output, and exchanges data information and issues commands with the above-mentioned landfill leachate biogas measurement and control device. First, the data of the electrostatic collector is introduced into the historical memory. At the same time, when a certain instrument detects a voltage difference, a discharge phenomenon may occur, and an early warning message is generated immediately. After the biogas concentration reaches the early warning value, an alarm message is issued. Second, the data collected by each gas concentration, pressure, and flow meter are calculated and analyzed by the corresponding correlation factors, and the biogas production speed factor is used to form a biogas explosion risk assessment and explosion time point estimation calculation, and then the command is sent to the controlled equipment through the output interface. On the one hand, it is necessary to ensure that the risk of biogas explosion is controlled within the minimum range, and at the same time, it is also necessary to save the power demand of the equipment. All data are sent to the historical memory.

[0055] The intelligent diagnosis function of the intelligent detection and control center in this example adopts the prediction of biogas explosion data, and the calculation formula adopted can be calculated by the maximum value method and / or the average method.

[0056] 3. Human-machine interface

[0057] The human-machine interface is the interface for the control center to interact with the outside world. It mainly produces sound and light prompts through the computer display, alarm buzzer or audio of external devices to achieve the purpose of rapid alert; at the same time, it uses modern information transmission methods to conduct real-time query and display of information on mobile phones and other handheld devices.

[0058] As an embodiment of the utility model, the human-machine interface of this example is mainly composed of a computer with a display, a mouse and a keyboard, and a handheld device (such as a mobile phone). It is an information exchange between people and the system, and has functions such as information viewing, diagnostic information viewing, historical data viewing, command transmission, and timely transmission of alarm information.

[0059] The utility model forms the functions of intelligent analysis, diagnosis and early warning control of big data of all factors of biogas explosion, and combines to form a complete set of intelligent monitoring system for landfill leachate biogas explosion prevention accidents, which can effectively realize the biogas concentration monitoring function of the biogas accumulation area on the whole process line, and the static status monitoring of metal equipment and auxiliary pipelines in the whole process; the early warning and alarm function after the biogas exceeds the standard, and the information transmission function; the pre-exhaust function of the exhaust fan after the biogas exceeds the standard, and the effective control function of its suction and air volume; the strong ventilation control function after the pre-exhaust capacity of the exhaust fan decreases after the biogas exceeds the standard, etc., so as to effectively avoid the risk of explosion and have higher safety.

[0060] like Figure 3 As shown, as an embodiment of the utility model, the explosion-proof treatment process of this example is:

[0061] The combustible gas detection instrument that collects biogas sends data that is processed by the intelligent detection control center and generates biogas concentration pre-alarm information; when the pre-alarm value is reached, the exhaust fan is automatically started; if the exhaust fan is successfully started, it will automatically adjust until the warning information disappears, and automatically stop after a delay; if the exhaust fan fails to start, the sealed explosion-proof door will automatically open. When the biogas concentration reaches the alarm value, the supply fan should be started regardless of whether the exhaust fan is running, so as to force the biogas concentration to be diluted with air.

[0062] When the exhaust fan is operating normally, its gas delivery rate should be automatically adjusted according to the predicted value of biogas concentration; and the pipeline resistance should be judged by combining its inlet negative pressure-current (or current-gas flow rate); when the resistance increases, an alarm message should be generated in time for manual inspection.

[0063] This function is applicable to equipment in each area. If there is no exhaust fan in the pipeline and it is impossible to add equipment, the exhaust equipment can be omitted accordingly.

[0064] Preferably, this example can also be equipped with an infrared monitoring instrument to realize the infrared monitoring function. In order to prevent the fire source of biogas explosion and effectively avoid the risk of explosion, infrared monitoring instruments are installed in the leachate receiving pool and leachate regulating pool of the garbage storage to monitor the temperature and fire conditions of these biogas flammable and explosive areas, and connect to the intelligent control system for information communication.

[0065] Once a local temperature anomaly is found, an abnormal alarm will be immediately generated in the data processing center, and information will be sent through the human-machine interface device. Combined with the biogas concentration, different levels of alarm functions are set comprehensively. When there is a fire source and biogas concentration forecast, a fire extinguishing alarm will be issued in time. When there are no people on site, the fire monitors installed in the leachate collection tank and the regulating tank can be used to automatically extinguish the fire.

[0066] Preferably, this example can realize the function of replacing biogas with inert gas through the inert gas filling device. The function of this inert gas replacement biogas system is put into automatic state. When the biogas concentration reaches the alarm state, the enclosed space or pipeline where the ventilation function cannot be started is automatically controlled to fill the inert gas device to achieve the effect of replacing biogas or reducing the biogas concentration.

[0067] At the same time, monitor the pressure in each inert gas cylinder of the inert gas filling device. When the pressure reaches the lower limit, an alarm will be issued to replace or refill.

[0068] From the above description, it can be known that the utility model can realize the biogas concentration monitoring function of the biogas gathering area on the whole process line through modern instrument detection technology; the electrostatic state monitoring function of the metal equipment and auxiliary pipelines in the whole process can be realized through the computer intelligent diagnosis technology, modern display operation technology and handheld communication technology of the intelligent detection control center, so as to grasp the information of biogas production from the leachate more accurately and quickly, so as to understand the status of each subsystem and its biogas concentration development trend in real time, automatically and timely control the relevant equipment, automatically intervene in advance to prevent the generation of explosion conditions, and effectively prevent the biogas from reaching the explosion limit. At the same time, the intelligent diagnosis sends information to the handheld device in time, so that the relevant personnel can grasp the current status in time.

[0069] The specific implementation methods described above are preferred implementation methods of the present utility model, and are not intended to limit the specific implementation scope of the present utility model. The scope of the present utility model includes but is not limited to the specific implementation methods. All equivalent changes made in accordance with the present utility model are within the protection scope of the present utility model.

Claims

1. A landfill leachate biogas measurement and control device, arranged in a landfill leachate treatment system, characterized in that: include: Potential difference detection instrument: installed at the contact point between all electrical housings and metal parts in the landfill leachate treatment system, used to detect the potential difference between the metal parts of the leachate storage tank and the biogas; Combustible gas measuring instrument: installed at the biogas generating point of the leachate storage tank to detect biogas concentration; Ventilation structure: set in the biogas gathering space to reduce the biogas concentration; Biogas transportation test instrument: installed on the biogas transportation pipeline, used to test the flow or pressure of biogas.

2. The garbage leachate biogas measurement and control device according to claim 1, characterized in that: The ventilation structure includes ventilation equipment arranged on one side of the leachate storage tank and / or exhaust equipment arranged on the other side of the leachate storage tank.

3. The garbage leachate biogas measurement and control device according to claim 2, characterized in that: The ventilation structure also includes a sealed explosion-proof door that can be remotely controlled to open for ventilation.

4. The garbage leachate biogas measurement and control device according to claim 2 or 3, characterized in that: The garbage leachate treatment system comprises a garbage storage, a garbage storage leachate collection pool, a leachate treatment station, a collection corridor arranged between the garbage storage and the garbage storage leachate collection pool, a leachate delivery pipeline arranged between the garbage storage leachate collection pool and the leachate treatment station, and a biogas delivery pipeline arranged between the biogas outlet of the leachate treatment station and the garbage storage biogas collection port. There are multiple potential difference detection instruments and combustible gas measuring instruments, which are respectively arranged in the garbage leachate treatment system including the garbage storage, the garbage storage leachate collection pool, the leachate treatment station, the collection corridor, and the leachate delivery pipeline. There are multiple ventilation structures, which are respectively arranged in the garbage storage leachate collection pool, the leachate delivery pipeline, and the leachate treatment station. The biogas delivery test instruments are respectively arranged in the garbage storage leachate collection pool and the leachate treatment station.

5. The device for measuring and controlling the biogas from the landfill leachate according to claim 4, characterized in that: The primary air intake of the garbage storage and the collection gallery at the bottom of the garbage storage are both provided with combustible gas measuring instruments. The number of combustible gas measuring instruments in the collection gallery is more than one and is dispersedly arranged at set intervals. The biogas transmission pipeline is provided with a number of combustible gas measuring instruments, and all electrical enclosures and metal parts in contact are provided with potential difference detection instruments. The leachate delivery pipeline is provided with part or all of a combustible gas measuring instrument, an air blower and a potential difference detection instrument, wherein a biogas collection bag is provided on the upper part of the leachate delivery pipeline, the combustible gas measuring instrument is arranged on the biogas collection bag and is connected with the biogas in the biogas collection bag, the air blower is used to supply air into the leachate delivery pipeline, and the potential difference detection instrument is arranged at the connection point between all electrical housings and metal parts.

6. The device for measuring and controlling the biogas from the landfill leachate according to claim 5, characterized in that: It also includes an inerting device, which is arranged in a confined space of the landfill leachate treatment system or in a pipeline that is prone to generating biogas.

7. The device for measuring and controlling the biogas from the landfill leachate according to claim 4, characterized in that: The leachate collection tank is provided with several flammable gas measuring instruments, potential difference detection instruments, a biogas transport test instrument and / or an explosion-proof exhaust fan, wherein: The combustible gas measuring instruments are arranged at intervals on the top of the leachate collection tank to detect the accumulation of biogas in different areas. The biogas transportation test instrument and the explosion-proof exhaust fan are both arranged on the top of the leachate collection tank. The explosion-proof exhaust fan is arranged at the primary air intake port which sucks in air from above the leachate collection tank and sends it to the garbage storage through a pipeline. The potential difference detection instrument is arranged at the contact point between all electrical housings and metal parts of the leachate collection tank.

8. The device for measuring and controlling the biogas from the landfill leachate according to claim 4, characterized in that: The leachate treatment station is provided with a sedimentation tank, a regulating tank, and an anaerobic sedimentation tank connected by pipelines, wherein the sedimentation tank, the regulating tank, and the anaerobic sedimentation tank are all provided with a combustible gas measuring instrument, an exhaust fan, a biogas transport test instrument, a potential difference detection instrument, and a blower. The biogas transportation test instrument comprises a gas flow meter and a negative pressure measuring instrument, wherein the negative pressure measuring instrument is arranged at the inlet of the sedimentation tank, the regulating tank and the anaerobic sedimentation tank, and the gas flow meter is arranged at the outlet of the sedimentation tank, the regulating tank and the anaerobic sedimentation tank. The sedimentation tank, regulating tank and anaerobic sedimentation tank are also provided with sealed explosion-proof doors which can be opened and closed remotely.

9. The device for measuring and controlling the biogas from the landfill leachate according to claim 4, characterized in that: It also includes an infrared monitoring instrument, which is arranged in the flammable and explosive area of ​​biogas in the leachate collection pool of the garbage storage and the leachate treatment station.

10. An intelligent explosion-proof monitoring system for landfill leachate, characterized in that: It comprises the garbage leachate biogas measurement and control device as described in any one of claims 1 to 9, and also comprises an intelligent detection and control center and a human-machine interface, wherein the intelligent detection and control center is used to collect information of the garbage leachate biogas measurement and control device and control the garbage leachate biogas measurement and control device, and the human-machine interface is connected to the intelligent detection and control center to realize information transmission and command issuance.

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