CN105785950B - A kind of landfill gas optimization of collection control system based on high in the clouds - Google Patents
A kind of landfill gas optimization of collection control system based on high in the clouds Download PDFInfo
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- 238000005457 optimization Methods 0.000 title claims abstract description 32
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 90
- 238000012544 monitoring process Methods 0.000 claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000013480 data collection Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 130
- 238000005086 pumping Methods 0.000 claims description 41
- 238000004422 calculation algorithm Methods 0.000 claims description 12
- 230000035699 permeability Effects 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 6
- 230000002045 lasting effect Effects 0.000 claims description 4
- 230000015556 catabolic process Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000006731 degradation reaction Methods 0.000 claims description 3
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- 238000010248 power generation Methods 0.000 claims description 3
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- 238000000034 method Methods 0.000 abstract description 4
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- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000009792 diffusion process Methods 0.000 description 20
- 230000004907 flux Effects 0.000 description 14
- 238000013508 migration Methods 0.000 description 5
- 230000005012 migration Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The landfill gas optimization of collection control system based on high in the clouds that the invention discloses a kind of, including data collection station, control terminal and cloud server.The present invention is based on the landfill gas optimization of collection control system in high in the clouds can by landfill yard operational process creation data and monitoring data Cloud Server is transferred to by GPRS network, the optimization of the Inversion Calculation and production strategy of landfill yard model parameter is completed in Cloud Server, on the one hand data are presented to Website front-end to visualize, decision data, which is on the other hand sent to control terminal, carries out gas production optimal control.The present invention can effectively promote the environmental problem that landfill gas acquisition management is horizontal, and reduction landfill gas discharge causes as a result, promote utilization rate of the landfill gas (methane) as alternative clean energy resource, alleviating energy crisis.
Description
Technical field
The invention belongs to waste management and Internet of Things technical field of industrial control, and in particular to a kind of filling out based on high in the clouds
Bury gas optimization of collection control system.
Background technology
Human society steps into the epoch of high speed development, the production and living rubbish of people also with social development paces with
It is day all to increase, at present both at home and abroad to the processing mode of rubbish still based on landfill, supplemented by burning.Tupe section based on landfill
About many process costs, but many puzzlements are also brought, for example occupy the secondary dirt of a large amount of soils, landfill gas and percolate
Dye etc..Landfill gas is the by-product of household refuse landfill sites, and a large amount of landfills are will produce after the organic matter degradation in house refuse
Gas (CH4And CO2Based on), they are main greenhouse gases, can aggravate Global climate change, and in addition methane is clean energy resource,
It advocates " the 13 " beginning of year that development of clean energy utilizes, landfill gas ought to be by as valuable clean energy resource deposit
To the attention of government and enterprise.
It is domestic at present generally extensive to the management of landfill yard, there is the landfill yard of landfill gas gathering project all in only a few, i.e.,
Just there is such engineering, management level is not also high, and manager rationally will not collect and utilize to the creation data that landfill yard is daily.
It is well known that landfill yard is the dynamical system of a height time-varying, the geologic parameter moment in landfill yard is all in dynamic change
Among, if the geologic parameter of landfill yard time-varying can be obtained in such a way that real-time on-site monitors and further calculates analysis,
Will have to landfill field system and more fully hold.After obtaining accurate landfill yard geologic parameter, it can adjust accordingly
Landfill gas acquires negative pressure to obtain maximum gas collecting amount, and bleeding regulating negative pressure, which is next expanded on further, can increase gas
The reason of yield.
The migration of porous gases is caused by convection current and diffusion, and by taking the migration of binary composition porous gases as an example, convection current causes
Flux can be expressed as：
Wherein：NvIndicate total convective flux,WithConvective flux (the mol/m of gas 1 and gas 2 is indicated respectively2/ s),For ensemble average flow velocity (m/s), naFor total molar concentration (mol/m3)。
The diffusion of hole gas can be divided into bulk diffusion and Knudsen diffusion by driving force difference, if only considering bulk diffusion,
There can be following formula according to the mechanical balance of drag between gas and gas partial pressure：
Wherein：X1And X2It is the ratio that gas 1 and gas 2 account for hole gas total mole number,WithRespectively 1 He of gas
Bulk diffusion flux (the mol/m of gas 22/ s), D12For the diffusion coefficient (m of two vigour2/ s),It represents via bulk diffusion
Gas 1 molar concentration.
If only considering Knudsen diffusion, the Knudsen diffusion flux of gas 1 can be expressed as：
Wherein：For the Knudsen diffusion flux of gas 1, D1MFor Knudsen diffusion coefficient,It represents via Knudsen diffusion
Gas molar concentration, due to existing simultaneously bulk diffusion and Knudsen diffusion, the bulk diffusion flux and Knudsen diffusion flux of gas 1
It is equal, cause the sum of concentration gradient of bulk diffusion and Knudsen diffusion to be equal to the concentration gradient of gas 1, there is following formula：
The total flux of gas is the sum of convective flux and diffusion flux, is had for gas 1According to ideal
State equationIn formulaFor the molar concentration of gas 1,For the partial pressure of gas 1.
The following relationship of gas flux and partial pressure can be obtained by integrating above formula：
In formula：uaFor total gas pressure.
Increase pumping negative pressure if can be found that at extraction well according to formula (6) (7), gas stagnation pressure and partial pressure can be caused
The increase of barometric gradient, further according to Darcy's law：
It understands that barometric gradient increase can be such that gas flow rate increases, therefore the N on the right of equation can be made1And N2All increase, so gas
Body flux, that is, yield will increase.
In addition, according to specification《The processing of house refuse sanitary landfills gas collection and utilizing works operation and maintenance technical regulation》
(CJJ175-2012) 4.1.2 is provided in：Since landfill gas gas production rate changes over time larger, each air guide well should be arranged
Valve, and gas production and rate of air sucked in required balance are reached by valve opening.If rate of air sucked in required is more than gas production, the suction of air is easily caused
Enter, it is abnormally dangerous.Therefore, this regulation monitors the aerogenesis flow and pressure of air guide well in real time, once find gas production and pumping
Disequilibrium is measured, head valve aperture need to be adjusted immediately, reaches gas production and rate of air sucked in required balance again.
Invention content
In order to solve the atmosphere pollution that loss causes wantonly of the landfill gas based on methane, carbon dioxide and greenhouse effect
Should aggravate and gas landfill yard be detained cause heap body unstability landslide etc. geological disasters the problem of, the present invention provides one kind
Landfill gas optimization of collection control system based on high in the clouds, the system are built based on cloud server, are not limited by a space, Neng Gouli
Real-time optimization decision and Industry Control are carried out with creation data, it is horizontal to be obviously improved landfill gas acquisition management.
A kind of landfill gas optimization of collection control system based on high in the clouds is applied to the well-head valve of producing well in control landfill yard
Landfill gas is extracted from junk-heap body using pressure difference and is sent into Generators progress marsh gas power generation by door aperture；Described fills out
It includes producing well and monitoring well to bury field, and the monitoring well is arranged in array with fixed intervals, by adjacent four mouthfuls of monitoring wells institute
It is surrounding and arrange a bite producing well by the center of the square area of the length of side of fixed intervals；The landfill gas acquisition
Optimal Control System includes：Data collection station, control terminal and cloud server；Wherein：
The data collection station is used to acquire the air pressure of gas and flow in landfill yard, and will be about air pressure and gas
The monitoring data of flow are transferred to cloud server by GPRS network；
The cloud server obtains landfill yard rubbish based on the Ensemble Kalman Filter algorithm assimilation monitoring data
The permeability and porosity of heterogeneous distribution in rubbish heap body porous media；Then it is calculated respectively according to the permeability and porosity
It is evacuated the air pressure of methane gas under vacuum cavitations scheme, and then acquires the methane of every mouthful of producing well under each pumping vacuum cavitations scheme
Gas yield；Solution is optimized finally by following target equation, obtains the pumping vacuum cavitations scheme of system optimal
xbestAnd control terminal is transferred to by GPRS network；
Wherein：NxFor the sum of producing well in landfill yard, NtIt is risen to current time step number, f for system initializationi j(x)
For the methane gas production of i-th mouthful of producing well in j-th of time step under pumping vacuum cavitations scheme x, τjFor in j-th of time step
The market price of natural gas, x are pumping vacuum cavitations scheme and x={ x1,x2,…xNx, xiIt is negative for the pumping of i-th mouthful of producing well
Pressure, hi(xi) it is by pumping negative pressure xiGo the cost of i-th mouthful of producing well of cutting；
The control terminal is used for according to pumping vacuum cavitations scheme xbestThe head valve for controlling every mouthful of producing well is opened
Degree.
The data collection station includes the baroceptor being arranged in every mouthful of monitoring well, is arranged in every mouthful of producing well
On gas flow sensor and microcontroller and GPRS module；Wherein, the microcontroller collects baroceptor and gas
The monitoring data about air pressure and gas flow that body flow sensor is acquired, and then these are monitored by number by GPRS module
According to being transferred to cloud server.
The cloud server will be stored in about the monitoring data of air pressure and gas flow in MySQL database, into
And transfer current monitoring data from MySQL database automatically using the Crontab services in linux system and resolved,
Resolving is finally obtained into optimal pumping vacuum cavitations scheme xbestThe simultaneously current prison of real-time display is preserved into MySQL database
Measured data and pumping vacuum cavitations scheme xbest。
For any pumping vacuum cavitations scheme, the cloud server calculates the pumping negative pressure control by following equation
The air pressure of methane gas under scheme processed：
Wherein：ρnw、ηnw、And PnwThe respectively density of methane gas, percentage composition, saturation degree and air pressure, ε are landfill
The porosity of heterogeneous distribution in the junk-heap body porous media of field, t is the time,And MnwFor mole of methane gas
Quality, R are molar gas constant, and T is Current Temperatures；Q (z) is the source item for generating methane gas, and x, y, z is respectively X, Y, Z tri-
Distance on a direction, Kx、Ky、KzIt is heterogeneous respectively in landfill yard junk-heap body porous media to be distributed on tri- directions X, Y, Z
Permeability, g is acceleration of gravity.
The expression formula of the source item Q (z) is as follows：
Wherein：Source item Q (z) is the generation rate for indicating methane gas under different depth, CiIt is all dropped for i-th kind of component
Solution can generate the potential value of methane gas, AiFor the volume fraction of i-th kind of component in landfill yard junk-heap body, λiFor i-th kind of component
The generation constant of middle methane gas, teFor lasting for Closure of landfill site to current time, tfStart heap for landfill yard and is filled to closing
It lasts, z is distance, that is, depth in Z-direction, LzTo fill the thickness of body, the 1st~3 kind of component corresponds to landfill yard junk-heap body
In degradable, medium degradable and difficult to degrade three kinds of components.
For any pumping vacuum cavitations scheme, the cloud server calculates under the pumping vacuum cavitations scheme
To after the air pressure of methane gas, the flow velocity of methane gas around every mouthful of producing well is calculated by Darcy's law, and then according to stream
Speed acquires the methane gas production of every mouthful of producing well.
The control terminal includes the microcontroller being arranged on every mouthful of producing well, GPRS module and motor；Wherein, described
Microcontroller by GPRS module receive cloud server send over about this producing well be evacuated negative pressure digital signal, and
Corresponding controlled quentity controlled variable is exported after carrying out D/A conversions and PI adjustings successively to the digital signal, and then passes through motor and controls production
The head valve aperture of well.
The cloud server shows the real-time gas stream of every mouthful of producing well in landfill yard by the form of Website page
Amount data, the real-time barometric information of every mouthful of monitoring well and optimized solution are obtained about pumping vacuum cavitations scheme xbestTune
Control data.
Preferably, twice about pumping vacuum cavitations scheme x before and after cloud server calculatesbestRegulation and control data phase
When difference is little, then administrative staff can apply interrupt instruction by Website page, i.e., this regulation and control data is not used to be controlled, and
It continues to use last time regulation and control data and maintains corresponding operation；The operating loss of valve control can be reduced in this way.
The present invention is based on the landfill gas optimization of collection control systems in high in the clouds can be by the production number in landfill yard operational process
Cloud Server is transferred to by GPRS network according to monitoring data, the inverting meter of landfill yard model parameter is completed in Cloud Server
The optimization with production strategy is calculated, data are on the one hand presented to Website front-end and are visualized, on the other hand send out decision data
It is sent to control terminal and carries out gas production optimal control.The present invention can effectively promote landfill gas acquisition management level as a result, and reduction is filled out
The environmental problem that gas discharge causes is buried, utilization rate of the landfill gas (methane) as alternative clean energy resource is promoted, alleviates the energy
Crisis.
Description of the drawings
Fig. 1 is the two-dimensional level sectional drawing of landfill yard.
Fig. 2 is the logical architecture figure of control system of the present invention.
Fig. 3 is the landfill gas optimization of collection control flow chart of control system of the present invention.
Specific implementation mode
In order to more specifically describe the present invention, below in conjunction with the accompanying drawings and specific implementation mode is to technical scheme of the present invention
It is described in detail.
As shown in Figure 1, landfill yard two-dimensional level sectional drawing includes producing well and monitoring well, monitoring well arranges one every 20m
Mouthful, in the intermediate arrangement a bite producing well for the square area that 4 mouthfuls of monitoring wells are formed, producing well well head is controlled by valve, is provided
Landfill gas is extracted using pressure difference and is sent into Generators progress marsh gas power generation by certain pumping negative pressure.Further, it produces
Flow monitoring sensor and valve opening controller are housed on well, opened for periodic monitor landfill gas data on flows and control valve
Degree.Monitoring well is smaller compared with caliber for producing well, and Pressure monitoring sensor is housed in different depth, is mainly used for periodic monitor and fills out
Bury the air pressure in field.
As shown in Fig. 2, the present embodiment control system system includes successively from top to bottom：Cloud server 1, on hardware view
It says, for a supercomputer with public network IP；It is said on software view, the clothes such as data cloud storage, web access is provided
Business, the cores that calculate can provide high performance parallel computation environment, for quickly handling landfill gas data, optimization made in the short time more
Decision scheme.Two data wireless transport modules 2 and 6 are communicated based on Socket ICP/IP protocols with Cloud Server 1.Two lists
Piece machine 3 and 7, wherein microcontroller 3 are mounted on producing well shown in FIG. 1, the well head stream measured for receiving flow monitoring sensor 4
Data are measured, microcontroller 7 is mounted on monitoring well shown in FIG. 1, for receiving barometric information in the well that baroceptor 8 measures, flows
Amount data and barometric information are sent to cloud database 1 by above-mentioned wireless transport module 2 and 6 respectively；Mounted on producing well
On microcontroller 3 also connect with valve opening controller 5, by data wireless transport module 2 receive high in the clouds transmit it is excellent
Change control instruction, for the pumping negative pressure value after optimization, microcontroller parses the negative pressure and is worth to analog signal control valve aperture,
And then control landfill gas yield.This set system uses solar energy tabula rasa 9 and 10 of the output voltage no more than 12V to power for it.
Above-mentioned Cloud Server 1 configures increase income CentOS systems, MySQL database, Apache Server software, Python and opens
Hair ring border etc..MySQL database is used for data cloud storage, and Apache Server software is used for providing Web service, Python
In writing for system O＆M and high performance parallel computation program.
Above-mentioned data wireless transport module 2 and 6 uses GPRS module, using SIM900A chips, supports mark AT instructions,
It based on Socket ICP/IP protocols, is communicated with Cloud Server 1 using China Mobile's GPRS network, landfill yard survey can be significantly expanded
It is horizontal to the acquisition of landfill yard real-time running data greatly to promote administrative staff for the arrangement range of point.
Above-mentioned microcontroller 3 and 7 uses MCS-51 series monolithics, and 9 He of solar energy tabula rasa of 12V is no more than by output voltage
10 power for it, and built-in A/D converter, for the data conversion between microcontroller and sensor, in addition, passing through TTL interfaces
It is connect with above-mentioned GPRS module 2 and 6.
As shown in figure 3, the landfill gas optimization of collection control flow of this implementation control system includes the following steps：
S1. landfill yard in normal operation, every 12 hours adopted by the sensor 4 and 8 on producing well and air pressure monitoring well
Collect a data, by being separately sent to microcontroller 3 and 7 after A/D converter, using GPRS module 2 and 6, passes through mobile network
Network transfers data in the database of cloud server 1.
S2. cloud database is built by MySQL, and dynamic web page obtains MySQL data by PHP script edits, using PHP programs
Newest gas flow data and barometric information in library pass to JavaScript program, it can be achieved that two item datas are in front end net
The dynamic chart of page is shown.
S3. model parameter inversion algorithm is a set of shell script write by Python, and present embodiment utilizes Linux systems
The monitoring data at current time are extracted in the Crontab service timings of system from MySQL database, to participate in data assimilation.It should
Algorithm can be the data assimilations algorithms such as Ensemble Kalman Filter, and the present embodiment is by taking Ensemble Kalman Filter algorithm as an example.It is utilizing
Ensemble Kalman Filter carries out in the process of data assimilation, it is necessary first to build state vector y：
State vector y includes model parameter (the junk-heap body porosity not changed over time substantiallyPair of permeability
Number form formula ln K), and the state variable (monitoring well air pressure P, producing well gas flow G) that changes over time.In order to fully examine
Consider place heterogeneity and parameter uncertainty caused by influence, the present embodiment structure Ne groups meet the y of Gaussian Profile to
Amount, and Y matrixes are formed, the influence that parameter uncertainty is brought is obtained by the statistical property of sample set.
Y=[y1, y2... yNe] (10)
Assimilate observation data using following formula, and then obtains the updated value of state vector：
J representative samples are numbered in formula (11), dObs, jIt is the jth group monitoring data by noise disturbance, subscript u represents update
State vector later, subscript f represent by modeling predict Lai state vector, CDFor observation error covariance matrix,Indicate corresponding predicted value at observation point, NeFor sample number, CYIt can be calculated with following formula：
Wherein：
The algorithm is based on landfill field model and real-time air pressure and flow monitoring data carry out real time sequence data assimilation, can obtain
Go out the relatively true distribution of the model parameters such as current time place intrinsic permeability, porosity.
S4. landfill yard model optimization is based on three-dimensional landfill field model, model parameter inversion algorithm and optimization algorithm operation.Three
Dimension landfill field model considers landfill yard as solid, liquid, gas three-phase coexistence system, it is assumed that solid compressed rule is it is known that be based on two-phase
Gas-liquid simultaneous transport model, the migration rule of description landfill yard landfill gas in the presence of having percolate are established in Darcy's law
Rule.
In the case of coexistence of gas and liquid (the present embodiment only considers methane gas), the governing equation of gas migration can use following formula table
It states：
In formula：ρnw、ηnw、And PnwFor the density of methane gas, percentage composition, saturation degree and air pressure, ε is landfill yard heap
The porosity of heterogeneous distribution in body porous media, t are the time,And MnwFor the molal weight of methane gas, R is
Molar gas constant, T are Current Temperatures, and Q (z) is the source item for generating methane gas, and x, y, z is respectively on tri- directions X, Y, Z
Distance, Kx、Ky、KzThe heterogeneous permeability being distributed on tri- directions X, Y, Z respectively in landfill yard heap body, g accelerate for gravity
Degree.The dependent variable of governing equation divides for methane gas, and methane gas can be solved after dividing according to Darcy's law by solving
Flow velocity, and then can continue to be calculated the methane gas flux i.e. yield at extraction well.Wherein：
Wherein：Q (z) is the generation rate of methane gas；I=1,2,3 indicate degradable in junk-heap body respectively, medium easy
Degradation and three kinds of components difficult to degrade；CiIt all degrades for i-th kind of component the potential value of the methane that can be generated；AiFor i-th kind of component
Volume fraction；λiFor the generation constant of methane gas in i-th kind of component；teFor lasting for Closure of landfill site to current time；tfFor
Landfill yard starts heap and is filled to lasting for closing；Z is distance, that is, depth in Z-direction；LzTo fill the thickness of body.
S5. optimization algorithm may be based on the Stochastic Optimization Algorithms of gradient, and the algorithm is based in the threedimensional model and S3 in S4
Obtained fitting parameter is solved using net profit as object function so that the maximum control program x of object function, i.e., every mouthful production
The pumping negative pressure of well；The form of object function is：
Wherein：NxFor producing well number, NtIt is risen to current time step number for system initialization, 12 hours are a step,It, can be by the parameter combination S4 that is obtained in S3 for the gas total output of i-th mouthful of producing well in j-th of time step under x schemes
In gas migration model calculating acquire；τjFor the market price of natural gas in j-th of time step, x is pumping vacuum cavitations side
Case andxiFor the pumping negative pressure of i-th mouthful of producing well；hi(xi) it is by pumping negative pressure xiIt goes to dig
The cost of i-th mouthful of producing well.
Present embodiment solves control program x using steepest ascent, and iterative formula is：
Wherein：L is iteration index, αlFor tuner parameters, CxFor smoothing matrix, Cx,g(x)It can be acquired by following formula：
Finally obtain the pumping negative pressure value x of every mouthful of producing well after optimizationi, and it is deposited into database.
S6. according to technology described in S2, the S5 optimum suction negative pressure values obtained are presented on front end webpage, for landfill yard management
Personnel refer to.
S7. the pumping negative pressure value for storing database is transferred to microcontroller 3 on producing well by mobile network, by GPRS
Module 2 is responsible for receiving data, and the D/A converter built in microcontroller is responsible for converting digital signals into analog signal, and then controls
Valve opening adjusts air pressure.
In addition, the transmission route of this implementation control system Optimal Decision-making instruction can also rest in administrative staff's hand, in S5
To pumping negative pressure optimization data be presented on webpage terminal, if administrative staff think this suboptimization data with 12 hours before phase
It is very smaller than changing, " interruption " instruction can be clicked in webpage terminal, terminate this remote control, after waiting for 12 hours next time
Cycle starts.If administrative staff do not send " interruption " instruction, system default sends optimization data and is carried out to terminal device
Remote control.
This hair can be understood and applied the above description of the embodiments is intended to facilitate those skilled in the art
It is bright.Person skilled in the art obviously easily can make various modifications to above-described embodiment, and described herein
General Principle is applied in other embodiment without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments,
Those skilled in the art's announcement according to the present invention, the improvement made for the present invention and modification all should be in the protections of the present invention
Within the scope of.
Claims (9)
1. a kind of landfill gas optimization of collection control system based on high in the clouds is applied to the head valve of producing well in control landfill yard
Landfill gas is extracted from junk-heap body using pressure difference and is sent into Generators progress marsh gas power generation by aperture；The landfill
Field includes producing well and monitoring well, and the monitoring well is arranged in array with fixed intervals, is enclosed by adjacent four mouthfuls of monitoring wells
At and arrange a bite producing well by the center of the square area of the length of side of fixed intervals；It is characterized in that：Described
Landfill gas optimization of collection control system includes：Data collection station, control terminal and cloud server；Wherein：
The data collection station is used to acquire the air pressure of gas and flow in landfill yard, and will be about air pressure and gas flow
Monitoring data cloud server is transferred to by GPRS network；
The cloud server obtains landfill yard rubbish heap based on the Ensemble Kalman Filter algorithm assimilation monitoring data
The permeability and porosity of heterogeneous distribution in body porous media；Then each pumping is calculated according to the permeability and porosity
The air pressure of methane gas under vacuum cavitations scheme, and then acquire the methane gas of every mouthful of producing well under each pumping vacuum cavitations scheme
Yield；Solution is optimized finally by following target equation, obtains the pumping vacuum cavitations scheme x of system optimalbestAnd
It is transferred to control terminal by GPRS network；
Wherein：NxFor the sum of producing well in landfill yard, NtIt is risen to current time step number, f for system initializationi j(x) it is pumping
Under vacuum cavitations scheme x in j-th of time step i-th mouthful of producing well methane gas production, τjFor natural gas in j-th of time step
The market price, x is pumping vacuum cavitations scheme and x={ x1,x2,…xNx, xiFor the pumping negative pressure of i-th mouthful of producing well, hi
(xi) it is according to pumping negative pressure xiIt goes to dig i-th mouthful of required cost price of producing well；
The control terminal is used for according to pumping vacuum cavitations scheme xbestControl the head valve aperture of every mouthful of producing well.
2. the landfill gas optimization of collection control system based on high in the clouds according to claim 1, it is characterised in that：The data
The gas flow sensor that acquisition terminal includes the baroceptor being arranged in every mouthful of monitoring well, is arranged on every mouthful of producing well
And microcontroller and GPRS module；Wherein, the microcontroller collects baroceptor and gas flow sensor is acquired
The monitoring data about air pressure and gas flow, and then these monitoring data are transferred to by cloud service by GPRS module
Device.
3. the landfill gas optimization of collection control system based on high in the clouds according to claim 1, it is characterised in that：The high in the clouds
Server will be stored in about the monitoring data of air pressure and gas flow in MySQL database, and then using in linux system
Crontab services are transferred current monitoring data from MySQL database and are resolved automatically, will finally resolve obtain it is optimal
It is evacuated vacuum cavitations scheme xbestThe simultaneously current monitoring data of real-time display and pumping vacuum cavitations are preserved into MySQL database
Scheme xbest。
4. the landfill gas optimization of collection control system based on high in the clouds according to claim 1, it is characterised in that：For any pumping
Gas vacuum cavitations scheme, the cloud server calculate methane gas under the pumping vacuum cavitations scheme by following equation
Air pressure：
Wherein：ρnw、ηnw、And PnwThe respectively density of methane gas, percentage composition, saturation degree and air pressure；ε is landfill yard rubbish
The porosity of heterogeneous distribution in rubbish heap body porous media, t is the time,And MnwFor the molal weight of methane gas,
R is molar gas constant, and T is Current Temperatures, and Q (z) is the source item for generating methane gas, and x, y, z is respectively tri- directions X, Y, Z
On distance, Kx、Ky、KzThe heterogeneous infiltration being distributed on tri- directions X, Y, Z respectively in landfill yard junk-heap body porous media
Rate, g are acceleration of gravity.
5. the landfill gas optimization of collection control system based on high in the clouds according to claim 4, it is characterised in that：The source item Q
(z) expression formula is as follows：
Wherein：Source item Q (z) is the generation rate for indicating methane gas under different depth, CiFor i-th kind of component whole degradation energy
Generate the potential value of methane gas, AiFor the volume fraction of i-th kind of component in landfill yard junk-heap body, λiFor first in i-th kind of component
The generation constant of alkane gas, teFor lasting for Closure of landfill site to current time, tfStart heap for landfill yard and is filled to going through for closing
When, z is distance, that is, depth in Z-direction, LzTo fill the thickness of body, the 1st~3 kind of component corresponds in landfill yard junk-heap body
Three kinds of components degradable, medium degradable and difficult to degrade.
6. the landfill gas optimization of collection control system based on high in the clouds according to claim 1, it is characterised in that：For any pumping
The air pressure of methane gas is calculated in gas vacuum cavitations scheme, the cloud server under the pumping vacuum cavitations scheme
Afterwards, the flow velocity of methane gas around every mouthful of producing well is calculated by Darcy's law, and then every mouthful of producing well is acquired according to flow velocity
Methane gas production.
7. the landfill gas optimization of collection control system based on high in the clouds according to claim 1, it is characterised in that：The control
Terminal includes the microcontroller being arranged on every mouthful of producing well, GPRS module and motor；Wherein, the microcontroller passes through GPRS moulds
Block receive cloud server send over about this producing well be evacuated negative pressure digital signal, and to the digital signal successively into
Row D/A conversions and PI export corresponding controlled quentity controlled variable after adjusting, and then the head valve aperture of producing well is controlled by motor.
8. the landfill gas optimization of collection control system based on high in the clouds according to claim 1, it is characterised in that：The high in the clouds
Server shows the real-time gas flow data of every mouthful of producing well, every mouthful of monitoring well reality in landfill yard by the form of Website page
When barometric information and it is optimized solution obtain about pumping vacuum cavitations scheme xbestRegulation and control data.
9. the landfill gas optimization of collection control system based on high in the clouds according to claim 8, it is characterised in that：Work as cloud service
Device calculates front and back twice about pumping vacuum cavitations scheme xbestRegulation and control data when being not much different, then administrative staff can pass through
Website page applies interrupt instruction, i.e., this regulation and control data is not used to be controlled, and continues to use last time regulation and control data and remain corresponding
Operation.
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| CN102053054A (en) * | 2010-11-12 | 2011-05-11 | 清华大学 | Method for on-site measuring permeability coefficient of landfill gas |
| CN202893789U (en) * | 2012-11-08 | 2013-04-24 | 广东新科迪环保科技有限公司 | Landfill gas flow monitoring system |
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| CN102053054A (en) * | 2010-11-12 | 2011-05-11 | 清华大学 | Method for on-site measuring permeability coefficient of landfill gas |
| CN202893789U (en) * | 2012-11-08 | 2013-04-24 | 广东新科迪环保科技有限公司 | Landfill gas flow monitoring system |
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