CN218481286U - Gas sampling device for gas outlet of gas guide pipe of household garbage landfill - Google Patents
Gas sampling device for gas outlet of gas guide pipe of household garbage landfill Download PDFInfo
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- CN218481286U CN218481286U CN202222610449.2U CN202222610449U CN218481286U CN 218481286 U CN218481286 U CN 218481286U CN 202222610449 U CN202222610449 U CN 202222610449U CN 218481286 U CN218481286 U CN 218481286U
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Abstract
The utility model discloses a sampling device for gas at the outer discharge port of an air duct of a household garbage landfill, which comprises a sampling box shell, wherein the sampling box shell is arranged at the top of the air duct, a temperature pressure sensor is arranged at the top of the sampling box shell, a sensor probe of the temperature pressure sensor extends into the sampling box shell, and the sensor probe is connected with a temperature pressure measuring device; the sampling box shell side wall is communicated with an outlet pipeline, one end of the outlet pipeline is sequentially connected with a drying device and a high-precision electronic flowmeter, the high-precision electronic flowmeter is connected with a sampling pipe, and the tail end of the sampling pipe is connected with a sampling bag. The utility model discloses a gaseous sampling device of domestic waste landfill gas pipe outer row mouth through set up the collecting box on arranging the mouth outward, is equipped with temperature, pressure measurement equipment and gas flow measurement equipment, through collecting the greenhouse gas of fixed volume to detect greenhouse gas concentration, calculate the greenhouse gas emission of arranging the mouth outward of marsh gas.
Description
Technical Field
The utility model belongs to the technical field of gas sampling device's technique and specifically relates to a gaseous sampling device of domestic waste landfill gas pipe outer row mouth is related to.
Background
The landfill site is one of important man-made methane emission sources, in China, the municipal domestic waste treatment is mainly landfill, and the main release source in the landfill project is biogas generated by landfill fermentation. When the garbage is buried, an air guide pipeline is generally laid to collect gas generated by fermentation, when the landfill operation is completed and the garbage stops entering, a high-density polyethylene film is covered on the whole landfill area, and the gas generated by the garbage fermentation in the landfill area is discharged outside through the air guide pipeline. According to the environmental assessment requirement, when the landfill depth of the general garbage is more than or equal to 10m, the outer discharge ports of the gas pipes are connected and conveyed to a torch for combustion. When the landfill depth is lower than 10m, the gas outlet of the gas pipe is not required to be connected, and the gas generated by landfill fermentation is directly discharged to the air through the gas outlet of the gas pipe. At present, the landfill site in China is mostly small and medium, and the early investment of a landfill gas collecting and treating system cannot be generally born. In the future, carbon trading is carried out, and the reduction of the carbon emission of the landfill project needs to determine the greenhouse gas emission amount of the landfill project to provide data support.
At present, the carbon emission of the refuse landfill project is mainly obtained by an IPCC list accounting method, the accounting method needs to input the analysis of refuse components of a landfill area, and considering that the quantity of a general refuse landfill is large, the quantity of the landfill refuse is large, and the refuse components representing the whole landfill area are difficult to obtain, so that the carbon emission calculated by an IPCC list algorithm has a large error with the actual carbon emission of the landfill area. When actual monitoring methods are employed, actual methane, carbon dioxide and nitrous oxide emissions can be obtained, providing a total carbon emission from the landfill. When the active collection system is adopted in the refuse landfill and the refuse landfill is sent to a biogas torch for incineration, an online monitoring device can be arranged on the conveying pipeline to measure the concentration and the flow rate of the greenhouse gas, so that the greenhouse gas release amount of the landfill area can be obtained. When an active collection system is not adopted in a landfill site, and the exhaust outlet of the air duct of a landfill area is directly discharged to the air, how to measure the release amount of greenhouse gases is a difficult point. At present, the common method for measuring the greenhouse gas emission quantity of the external exhaust outlet of the gas duct of the landfill area is to arrange an anemograph at the central position of the external exhaust outlet to measure the gas release speed, and simultaneously, an air pump is used for directly extracting a gas sample at the central point of the external exhaust outlet and sending the gas sample to a third-party laboratory to measure the gas concentration. And calculating the greenhouse gas emission amount of the external discharge port based on the area of the external discharge port, the gas release speed and the gas concentration. However, considering that the gas generated by garbage fermentation is unevenly released, the lower limit value measured by the anemometer is higher (generally 0.3 m/s), the influence of external wind speed change on the measurement result is larger, and the greenhouse gas release result has uncertainty. Or the soft air bag can be arranged on the methane outlet, the time required by the air bag from being dry and flat to being fully filled is measured, the greenhouse gas in the air bag is extracted for concentration measurement, and the greenhouse gas release amount with fixed time and fixed area is calculated through a formula. Meanwhile, the increase of the pressure in the air bag has certain influence on the natural release of greenhouse gases at the methane outlet.
Patent CN114314868A discloses a real-time collecting device and method for dynamic aeration water surface release VSCs gas, and mainly describes a real-time gas sampling device for aeration tank water surface, which includes a box system, a gas collecting system and a gas measuring system. The bottom of the gas collection box is provided with a gas sample collection port, the side wall of the gas collection box is provided with a gas outlet, the gas outlet is provided with a connecting pipe, and the connecting pipe passes through the drying device and the flowmeter to measure the real-time gas flow. The gas collection system comprises a Suma tank which is communicated with a gas collection box through a connecting pipe. The greenhouse gas emission was calculated by measuring the volume of gas collected over a fixed period of time, measuring the greenhouse gas concentration in the suma tank. However, the method has the defects that the sampling box needs to be placed on the water surface of the aeration tank for a long time, the temperature in the sampling box slowly rises, the color and the material of the sampling box are not required in the patent, and auxiliary equipment for reducing the temperature increase in the box is not adopted. In addition, the calculation method in this patent does not take into account the effect of temperature pressure on the amount of greenhouse gas released. Simultaneously, adopt the suma jar to collect gas, consider that gas concentration is on the low side, it is higher to gas collecting device's clean degree requirement, the shortcoming of suma jar is inconvenient washing, causes the background value higher easily. When a plurality of emission sources in a factory are subjected to sample collection, a plurality of suma tanks are needed, the device cost is high, and the cleaning cost is high. In the patent sampling box, only the temperature of the gas in the box is measured, and the change of the gas pressure in the box is not measured, so that whether the gas pressure in the box is increased or not and whether the natural release of the gas on the water surface is influenced or not can not be judged according to the change of the pressure in the box.
Patent CN107941571A discloses an amphibious greenhouse gas detection device and detection method, and the described device has the characteristics of portability, low cost and strong adaptability. Although the device is provided with the thermometer and the barometer, the temperature and pressure sensor is not combined with the flowmeter, the accuracy of the collected sample cannot be confirmed according to the change of the pressure, and the device is not suitable for a landfill site with uneven gas speed and is easy to appear in a scene of one strand of gas being discharged.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is not enough to above-mentioned prior art, and provide a domestic waste landfill gas duct outer row mouth gas sampling device, through set up the collecting box on the outer row mouth, be equipped with temperature, pressure measurement equipment and gas flow measurement equipment, through collecting the greenhouse gas of fixed volume to detect greenhouse gas concentration, calculate the greenhouse gas emission of marsh gas outer row mouth.
In order to achieve the above purpose, the utility model discloses a gaseous sampling device of domestic waste landfill gas duct outer row mouth's concrete technical scheme as follows:
a gas sampling device for an air guide pipe outer discharge port of a household garbage landfill comprises a sampling box shell, a temperature and pressure measuring device, a drying device, a high-precision electronic flowmeter and a sampling bag;
the sampling box shell is arranged at the top of the gas guide pipe, the gas guide pipe of the landfill area is shown in the attached drawing 3, the gas guide pipe is vertically arranged and is a through circular pipe, and biogas generated by fermentation of garbage under the covering layer of the landfill area is discharged to the environment through the gas guide pipe; the temperature and pressure sensor is mounted at the top of the sampling box shell, a sensor probe of the temperature and pressure sensor extends into the sampling box shell, the sensor probe is connected with a temperature and pressure measuring device, and the temperature and pressure measuring device is used for displaying the temperature and pressure parameter changes in the sampling box shell in real time, so that the working condition parameter changes in the sampling box can be better observed, whether pressure changes exist or not can be judged, not only can the sampling duration be assisted to be determined, but also the emission of greenhouse gases can be corrected, and the emission of actual working conditions can be obtained; an outlet pipeline is communicated with the side wall of the sampling box shell, one end of the outlet pipeline is sequentially connected with a drying device and a high-precision electronic flowmeter, the high-precision electronic flowmeter is connected with a sampling pipe, and the tail end of the sampling pipe is connected with a sampling bag;
gas in the sampling box flows through high accuracy electron flowmeter behind drying device and gets into the sampling bag, through collecting the flow of fixed time to send into the third party laboratory and detect the greenhouse gas concentration in the sampling bag, and combine the operating mode parameter in the sampling box, calculate the greenhouse gas concentration of gas pipe external discharge port through the formula, the formula is as follows:
in the formula: f is gas release mg/min;
c is the gas concentration in the sampling bag, mg/m 3 ；
Q is the cumulative flow during the sampling period recorded by the flowmeter, m 3 ；
t is the accumulated time of the sampling process, min;
t is the average temperature in the sampling box in the sampling process, K;
p is the average pressure in the sampling box in the sampling process, kPa;
T 0 、P 0 the temperature and pressure under standard conditions were 273.15K,101.325kPa.
Furthermore, the air duct is a through circular tube which is vertically arranged, and the top end of the air duct is provided with an air duct outer discharge port; the bottom of the sampling box shell is provided with a sampling box base, the sampling box base is square, the middle of the sampling box base is provided with an inward concave part, the inward concave part is of a circular ring opening structure, a rubber cushion is adhered to the inward concave part and is circular, the size of the rubber cushion is matched with the size of the inward concave circular ring, the air pipe outer discharge port is inserted into the inward concave part and is abutted against the rubber cushion, and the self weight of the sampling box is adopted to increase the sealing property between the rubber cushion and the air pipe outer discharge port;
the bottom plate of the sampling box shell is of a concave reducing structure, the outer diameter of an air guide pipe of a household garbage landfill site is 200mm, the diameter of the concave part of the sampling box base is 210mm, and the concave part is slightly larger than the air guide pipe, so that the sampling box shell has a stabilizing effect and prevents the sampling box arranged on the air guide pipe from sliding; the thickness of the gas guide pipe is 8mm, the inner diameter of the gas guide pipe is 184mm, the opening diameter of the concave part of the sampling box base is 180mm and is slightly smaller than the inner diameter of the gas guide pipe, and as shown in figure 4, biogas generated by garbage fermentation under the landfill covering layer enters the sampling box through the gas guide pipe;
the actual situation of the methane external discharge port of the household garbage landfill site is fully researched, and based on the defect of greenhouse gas detection of the existing gas guide external discharge port of the landfill area, the greenhouse gas sample collecting device suitable for the methane external discharge pipe of the landfill area is pertinently researched, and the whole device can be stably placed on the external discharge port through the reducing support plate; the method comprises the steps of calculating the time required for emptying the gas in a sampling box by using the volume of the sampling box and the average flow rate measured by a flow meter, emptying the air in the sampling box by twice, resetting the flow meter to zero at the moment, connecting a sampling bag 6 for sampling, determining the sampling duration based on the change of the air pressure parameter in the collecting box, recording the accumulated flow value displayed by the flow meter, detecting the corresponding greenhouse gas concentration, and calculating the greenhouse gas release amount of a methane external discharge port.
Further, the sampling pipe comprises a main pipeline and at least one branch pipeline connected with the main pipeline, a reverse flow stop valve is arranged on the main pipeline, and a stop valve is arranged on the branch pipeline.
Furthermore, four corner position symmetries of sampling box casing bottom are provided with the couple for hang the weight and increase the leakproofness between sampling box casing and the air duct.
Further, an electric fan is installed on the inner side wall of the sampling box shell and used for stirring and mixing gas.
Furthermore, the sampling box shell is made of PVC materials, and the fact that the temperature in the sampling box is gradually increased due to heat radiation of the sampling box is mainly considered; the outer surface of the shell of the sampling box is provided with a reflective heat-preservation heat-insulation coating, so that the temperature increase in the sampling box caused by sunlight irradiation in long-time sampling is reduced.
Compared with the prior art, the beneficial effects of the utility model are that:
the gas sampling device mainly comprises a gas collecting box, a temperature and pressure sensor probe, a measuring instrument, a weighted weight, a drying device and a high-precision electronic flowmeter, wherein the time required for emptying the gas in the collecting box is calculated based on the flow speed and the volume of the gas collecting box displayed by the electronic flowmeter, after twice the time, the flowmeter is reset, a gas sampling bag is connected with a sampling pipe, the gas flow resistance in the sampling pipe is continuously increased along with the continuous increase of the gas in the sampling bag, the gas pressure in the collecting box is continuously increased, when the average increase of 1min of a gas pressure parameter in the collecting box is greater than 1% of an initial gas pressure value, a stop valve is opened, the sampling bag is screwed tightly, the volume displayed by the flowmeter is used as the sampling volume, the sampling bag is sent to a third-party laboratory to detect the concentration of greenhouse gas, the greenhouse gas concentration is detected based on the sampling volume, the concentration of the greenhouse gas, and the time required for reaching the sampling volume, and the greenhouse gas release amount of an outer discharge port is calculated. Compared with the patent CN114314868A, the device is used for greenhouse gas emission of the methane outlet of the landfill area, and the sealing property between the sampling device and the methane outlet is increased by using a weighted weight; except the temperature in gas collecting box, the while air pressure of measuring because the difficult washing of suma jar arouses the background higher, easily causes the error for next measurement, uses the polyvinyl fluoride bag as the sampling bag in this application.
1. According to the method, the sampling device for the gas guide outer discharge port of the biogas is designed according to the actual working condition of the landfill, the greenhouse gas discharge of the biogas outer discharge port of the landfill is quantitatively detected, the greenhouse gas with the fixed volume is measured, the measured greenhouse gas concentration is combined, and the environmental working condition parameters in the sampling box are used for calculating the release rate of the greenhouse gas, so that the greenhouse gas discharge amount is further determined.
2. This application design stereoplasm sampling box reduces the influence of external wind direction wind speed change to gas sampling, adopts the polyethylene material simultaneously to scribble reflection heat preservation thermal insulation material at the shell, reduce the influence of solar radiation to the temperature in the sampling box. By utilizing the weight of the sampling box and the weight of the weight, the tightness between the bottom supporting plate and the methane outer discharge port is increased.
3. According to the method, the temperature and pressure sensor is adopted, the data recording device is arranged, corresponding parameters are recorded according to set time intervals, and the parameters can be exported or sent after sampling is finished, so that the parameter condition of the sampling process is omitted during manual operation, and the method is more convenient and faster; the pressure change in the sampling box can be measured in real time, and the sampling time length is determined according to the pressure change in the sampling box, so that the natural release of greenhouse gases at the gas guide exhaust outlet of the biogas is prevented due to the obvious increase of the pressure in the collecting box caused by unreasonable setting of the sampling time length. In addition, the introduction of the pressure parameters can correct the greenhouse gas release amount through a calculation formula so as to obtain the greenhouse gas emission amount under the actual working condition.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a sampling box housing of the present invention;
FIG. 3 is a schematic view of the middle airway tube of the present invention;
FIG. 4 is a schematic view of the base of the sampling box and the outlet of the gas conduit according to the present invention;
the symbols in the figure illustrate: 1. a temperature pressure measuring device; 2. a drying device; 3. a high-precision electronic flow meter; 4. a reverse flow stop valve; 5. a stop valve; 6. a sampling bag; 7. hooking; 8. an electric fan; 9. a sensor probe; 10. a sampling box housing; 11. an air duct; 12. a rubber cushion; 13. an air duct external discharge port; 14. sampling box base.
Detailed Description
In order to better understand the purpose, structure and function of the present invention, the following description is made in detail with reference to the accompanying drawings and the preferred embodiments.
In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, "first", "second" and the like do not indicate the degree of importance of the component parts, and thus, are not to be construed as limiting the present invention. The specific dimensions used in the present embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present invention.
Example 1:
referring to fig. 1-4, the present invention provides a technical solution: a gas sampling device for an air guide pipe outer discharge port of a household garbage landfill comprises a sampling box shell 10, a temperature and pressure measuring device 1, a drying device 2, a high-precision electronic flowmeter 3 and a sampling bag 6;
the sampling box shell 10 is installed at the top of the gas guide tube 11, the gas guide tube 11 of the landfill area is shown in the attached drawing 3, the gas guide tube 11 is vertically arranged, the gas guide tube 11 is a through circular tube, and methane generated by fermentation of garbage under the covering layer of the landfill area is discharged to the environment through the gas guide tube 11; the top of a sampling box shell 10 is provided with a temperature pressure sensor, a sensor probe 9 of the temperature pressure sensor penetrates and extends into the sampling box shell 10, the sensor probe 9 is connected with a temperature pressure measuring device 1, and the temperature pressure measuring device 1 is used for displaying the temperature and pressure parameter changes in the sampling box shell 10 in real time, so that the working condition parameter changes in the sampling box can be better observed, whether the pressure changes exist or not can be judged, not only can the sampling duration be assisted to be determined, but also the emission of greenhouse gases can be corrected, and the emission of actual working conditions can be obtained; an outlet pipeline is communicated with the side wall of the sampling box shell 10, one end of the outlet pipeline is sequentially connected with a drying device 2 and a high-precision electronic flowmeter 3, the high-precision electronic flowmeter 3 is connected with a sampling pipe, and the tail end of the sampling pipe is connected with a sampling bag 6;
gas in the sampling box flows through high accuracy electron flowmeter 3 behind drying device 2 and gets into sampling bag 6, through collecting the flow of fixed time to send into the third party laboratory and detect the greenhouse gas concentration in the sampling bag 6, and combine the operating mode parameter in the sampling box, calculate the greenhouse gas concentration of gas pipe external discharge mouth 13 through the formula, the formula is as follows:
in the formula: f is gas release mg/min;
c is the gas concentration in the sampling bag, mg/m 3 ；
Q is the cumulative flow during the sampling period recorded by the flowmeter, m 3 ；
t is the cumulative time of the sampling process, min;
t is the average temperature in the sampling box in the sampling process, K;
p is the average pressure in the sampling box in the sampling process, kPa;
T 0 、P 0 the temperature and pressure under standard conditions were 273.15K,101.325kPa.
Further, the air duct 11 is a vertically arranged through circular duct, and an air duct outer discharge outlet 13 is arranged at the top end of the air duct 11; the bottom of the sampling box shell 10 is provided with a sampling box base 14, the sampling box base 14 is square, the middle part of the sampling box base 14 is provided with an inward concave part, the inward concave part is of a circular ring opening structure, a rubber cushion 12 is adhered to the inward concave part, the rubber cushion 12 is circular, the size of the rubber cushion 12 is matched with the size of the inward concave ring, the air duct outer discharge port 13 is inserted into the inward concave part and is abutted against the rubber cushion 12, and the self weight of the sampling box is adopted to increase the sealing property between the rubber cushion 12 and the air duct outer discharge port 13;
the bottom plate of the sampling box shell 10 is of a concave reducing structure, taking the outer diameter of the air duct 11 of a household garbage landfill as an example, the diameter of the concave part of the sampling box base 14 is 210mm, and is slightly larger than the air duct 11, so that the sampling box has a stabilizing effect and is prevented from sliding when being installed on the air duct 11; the thickness of the gas guide tube 11 is 8mm, the inner diameter of the gas guide tube 11 is 184mm, the opening diameter of the concave part of the sampling box base 14 is 180mm, and is slightly smaller than the inner diameter of the gas guide tube 11, as shown in figure 4, biogas generated by fermentation of garbage under the landfill covering layer enters the sampling box through the gas guide tube 11;
the actual situation of the methane external discharge port of the household garbage landfill site is fully researched, and based on the defect of greenhouse gas detection of the existing gas guide external discharge port of the landfill area, the greenhouse gas sample collecting device suitable for the methane external discharge pipe of the landfill area is pertinently researched, and the whole device can be stably placed on the external discharge port through the reducing support plate; the method comprises the steps of calculating the time required for emptying the gas in a sampling box by using the volume of the sampling box and the average flow rate measured by a flow meter, emptying the air in the sampling box by twice, resetting the flow meter to zero at the moment, connecting a sampling bag 6 for sampling, determining the sampling duration based on the change of the air pressure parameter in the collecting box, recording the accumulated flow value displayed by the flow meter, detecting the corresponding greenhouse gas concentration, and calculating the greenhouse gas release amount of a methane external discharge port.
Further, the sampling pipe includes trunk line and at least one lateral conduit of being connected with the trunk line, is provided with backflow stop valve 4 on the trunk line, is provided with stop valve 5 on the lateral conduit.
Further, four corner positions of sampling box casing 10 bottom are provided with couple 7 symmetrically for hang the weight and increase the leakproofness between sampling box casing 10 and the air duct 11.
Further, an electric fan 8 is installed on the inner side wall of the sampling box shell 10 and used for stirring and mixing gas.
Further, the sampling box shell 10 is made of a PVC material, which mainly considers that the temperature in the sampling box is gradually increased due to heat radiation of the sampling box; the surface of sampling box casing 10 is equipped with reflection heat preservation thermal barrier coating, reduces because of the increase of the temperature in the sampling box that long-time sampling received sunshine to shine and lead to.
The working principle is as follows:
the gas guide pipes can be paved in layers in the domestic garbage landfill site during garbage landfill so as to lead out gas generated by garbage fermentation, when the landfill depth of the whole landfill area of most of the landfill sites before or after the landfill site is not sealed is lower than the environmental evaluation design depth, the gas guide pipes buried in the landfill body area are not actively collected, and methane generated by landfill garbage fermentation is directly discharged into the atmosphere through the gas guide pipe outer discharge port.
In view of the amount of greenhouse gas emitted from landfill areas, it is therefore desirable to quantitatively monitor the amount of greenhouse gas produced by landfill fermentation. The currently adopted method is that a handheld sampling pump is used for acquiring the concentration of gas at the discharge outlet by parallel sampling of the outer discharge outlet, and an anemometer is used for measuring the flow rate of biogas at the outer discharge outlet so as to calculate the amount of greenhouse gas at the outer discharge outlet of the biogas. However, the speed of gas generated by landfill fermentation is not uniform, and the condition of one strand of gas is easy to be discharged, the condition of uneven sampling, larger concentration difference between parallel samples and the like is easy to occur when parallel samples are taken at the position of an outer discharge port. And the minimum wind speed lower limit of the anemometer is generally 0.3 or 0.4m/s, and the discharge rate cannot be measured when the wind speed lower limit is lower. In addition, the area of the landfill site is large, circuits are not easy to lay, released methane belongs to flammable and explosive gas, circuits are not suitable to be arranged in the landfill area, and online monitoring equipment cannot be used for measuring the methane emission concentration.
Aiming at the existing problems, the sampling box device is used for measuring the discharge amount of the methane outlet, the greenhouse gas concentration under the accumulated flow is measured, the temperature and pressure parameters in the sampling box are combined, the greenhouse gas concentration in the fixed volume is calculated through a formula, and the accumulated flow is combined to calculate the greenhouse gas release amount of the methane outlet. In this sampling device, newly increase and add the weight, increase the leakproofness between sampling device and the outer mouth of arranging of marsh gas, increase baroceptor simultaneously in the sampling box to judge long-time sampling in-process, the operating mode change in the sampling box, and help confirming sampling end time and flowmeter sampling volume. In addition, the sampling bag with the fixed volume is adopted to replace a suma tank, the price is low, the sampling bag can be used for one time, and the background value of the sampling bag is prevented from being high when the sampling bag is cleaned and reused.
Temperature pressure measurement equipment 1 in this application, mainly be in order to help confirming sampling time and sampling volume, in the sampling process, the exit tube who passes through the collecting box side behind the greenhouse gas of gas pipe outer row mouth 13 release mixes evenly in the collecting box discharges, through drying device 2, be connected with sampling bag 6 through the sampling pipe behind the high accuracy electronic flowmeter 3, along with the gas volume in the sampling bag 6 increases gradually, the gas resistance among the gas pipe 11 constantly increases, lead to the atmospheric pressure in the collecting box to constantly increase. The increase in gas pressure in the collection chamber will inhibit the natural release of gas from the gas duct exit 13. In this application sampling process, when the increase range of collecting box internal pressure in 1min was greater than 1% of initial pressure value, stop valve 5 can be opened, screws up sampling bag 6 to the accumulative total value that 3 shows of high accuracy electron flowmeter at this moment will be as the sample volume. In addition, the newly added pressure parameters in the collecting box can correct the greenhouse gas release amount through a calculation formula so as to obtain the greenhouse gas emission amount of the gas guide pipe outer discharge port 13 under the actual working condition.
The following explains the terms and words referred to in this application:
greenhouse gases refer to any gas that absorbs and releases infrared radiation and that is present in the atmosphere. The 6 greenhouse gases prescribed for control in the kyoto protocol were: carbon dioxide (CO 2), methane (CH 4), nitrous oxide (N2O), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), sulfur hexafluoride (SF 6).
The unorganized emission source generally means that the emission source is low in height, pollutants enter a respiratory zone without being fully diluted, the diffusion of the pollutants is gradually reduced along with the increase of the downwind distance of the emission source, the pollutants are often randomly emitted in a multi-point and dispersive mode, and monitoring, evaluation and management are difficult.
The outer discharge port of the landfill gas guide pipe is that a gas guide pipe is generally laid during landfill to collect methane generated in the fermentation process of landfill garbage. When the refuse landfill operation is finished and the entering is stopped, the whole landfill area is covered with the HDPE film, and gas generated by refuse fermentation in the whole landfill area is discharged outside through the gas guide pipe. According to the environmental evaluation requirement, when the landfill depth of the general garbage is more than or equal to 10m, the gas pipe outer discharge ports are connected, and flare combustion is carried out through a conveying pipeline. When the landfill depth of the garbage is lower than 10m, the gas guide pipe outer discharge port is not required to be connected, and gas generated by landfill fermentation is directly discharged to the air through the gas guide pipe outer discharge port.
The air bag method is that greenhouse gas released enters an air bag with a fixed volume within a certain time and a certain discharge source area, and the time spent by the air bag from a flat state to a full-filling state is measured. And calculating the greenhouse gas released by the emission source per unit time and unit area, namely the emission flux, according to the time required by the air bag to reach the filling state, the concentration of the greenhouse gas in the air bag in the filling state and the temperature and pressure parameters. At present, the method is commonly used for measuring the gas release amount of the water surface of an aeration tank of a sewage plant or an aeration tank of a leachate station.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes or equivalents may be substituted for elements thereof by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are intended to be covered by the present invention.
Claims (6)
1. The utility model provides a gaseous sampling device of domestic waste landfill gas pipe outer row mouth which characterized in that: the device comprises a sampling box shell (10), a temperature and pressure measuring device (1), a drying device (2), a high-precision electronic flowmeter (3) and a sampling bag (6);
the sampling box shell (10) is installed at the top of the air guide pipe (11), the temperature and pressure sensor is installed at the top of the sampling box shell (10), a sensor probe (9) of the temperature and pressure sensor extends into the sampling box shell (10), and the sensor probe (9) is connected with the temperature and pressure measuring equipment (1); the sampling box shell (10) is communicated with an outlet pipeline on the side wall, one end of the outlet pipeline is sequentially connected with a drying device (2) and a high-precision electronic flowmeter (3), the high-precision electronic flowmeter (3) is connected with a sampling pipe, and the tail end of the sampling pipe is connected with a sampling bag (6).
2. The gas sampling device at the outer discharge port of the gas guide pipe of the household garbage landfill as defined in claim 1, wherein the gas guide pipe (11) is a vertically arranged through circular pipe, and the top end of the gas guide pipe (11) is provided with the outer discharge port (13) of the gas guide pipe; sampling box casing (10) bottom is equipped with sampling box base (14), and sampling box base (14) are the square, and sampling box base (14) middle part is equipped with the indent part, and the indent part is ring opening structure, and rubber cushion (12) have been pasted to the indent part, and rubber cushion (12) are ring shape, and air guide pipe outer row mouth (13) inserts indent part and rubber cushion (12) butt.
3. The gas sampling device at the outer discharge port of the gas pipe of the household garbage landfill as claimed in claim 1, wherein the sampling pipe comprises a main pipe and at least one branch pipe connected with the main pipe, a reverse flow stop valve (4) is arranged on the main pipe, and a stop valve (5) is arranged on the branch pipe.
4. The gas sampling device at the outer discharge opening of the gas guide pipe of the household garbage landfill as claimed in claim 1, wherein hooks (7) are arranged at four corner positions at the bottom of the sampling box shell (10) and used for hanging weights to increase the sealing property between the sampling box shell (10) and the gas guide pipe (11).
5. The gas sampling device at the outer exhaust outlet of the gas pipe of the household garbage landfill as claimed in claim 1, characterized in that an electric fan (8) is installed on the inner side wall of the sampling tank shell (10) and used for stirring and mixing gas.
6. The gas sampling device at the external discharge port of the gas pipe of the household garbage landfill as claimed in claim 1, characterized in that the sampling tank shell (10) is made of PVC material, and the outer surface of the sampling tank shell (10) is provided with a reflective heat-preservation and heat-insulation coating.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116380574A (en) * | 2023-06-06 | 2023-07-04 | 四川发展环境科学技术研究院有限公司 | Greenhouse gas collection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116380574A (en) * | 2023-06-06 | 2023-07-04 | 四川发展环境科学技术研究院有限公司 | Greenhouse gas collection method |
| CN116380574B (en) * | 2023-06-06 | 2023-08-18 | 四川发展环境科学技术研究院有限公司 | Greenhouse gas collection method |
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