CN109682714A - A kind of heap body measure of resistance device and resistance coefficient acquisition methods - Google Patents
A kind of heap body measure of resistance device and resistance coefficient acquisition methods Download PDFInfo
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- CN109682714A CN109682714A CN201910107403.9A CN201910107403A CN109682714A CN 109682714 A CN109682714 A CN 109682714A CN 201910107403 A CN201910107403 A CN 201910107403A CN 109682714 A CN109682714 A CN 109682714A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000009423 ventilation Methods 0.000 claims abstract description 67
- 238000012360 testing method Methods 0.000 claims abstract description 50
- 239000002184 metal Substances 0.000 claims abstract description 39
- 229910052751 metal Inorganic materials 0.000 claims abstract description 39
- 230000008602 contraction Effects 0.000 claims abstract description 19
- 239000000411 inducer Substances 0.000 claims abstract description 19
- 238000009264 composting Methods 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims abstract description 13
- 230000003068 static effect Effects 0.000 claims abstract description 12
- 239000000523 sample Substances 0.000 claims description 40
- 239000002361 compost Substances 0.000 claims description 37
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000013016 damping Methods 0.000 claims description 6
- 206010021703 Indifference Diseases 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000001603 reducing effect Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000036651 mood Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/10—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
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Abstract
The present invention relates to a kind of heap body measure of resistance device and resistance coefficient acquisition methods comprising wind-tunnel main body, ventilation quantity collection system, metal perforated plate container, ventilating system, air inlet air-flow temperature control regulating system and air-flow static pressure difference measuring system；Wind-tunnel main body is made of outlet section, the first Wind Tunnel Contraction, the first wind-tunnel stable section, test chamber, the second wind-tunnel stable section, the second Wind Tunnel Contraction and inducer；Outlet section is successively connect with the first Wind Tunnel Contraction, the first wind-tunnel stable section, test chamber, the second wind-tunnel stable section, inducer and the second Wind Tunnel Contraction；It is provided with ventilation quantity collection system at outlet section, and is provided with metal perforated plate container in test chamber, ventilating system is connect with metal perforated plate container, enters the wind air-flow temperature control regulating system and air-flow static pressure difference measuring system is all connect with test chamber.The resistance and resistance coefficient of entire composting period heap body can be obtained in the present invention, carries out CFD simulation for heap body interior environmental conditions and lays a good foundation.
Description
Technical field
The present invention relates to a kind of compost testing fields, obtain especially with regard to a kind of heap body measure of resistance device and resistance coefficient
Take method.
Background technique
The procedure parameter for influencing compost effect includes heap body internal temperature and oxygen concentration etc., and divulge information be influence temperature,
One of an important factor for oxygen concentration and its distribution.It is main at this stage that temperature inside heap body is probed by on-the-spot test or theoretical calculation
Angle value, oxygen concentration and its distribution, to assess the effect of ventilating system.But that there is measuring points is limited for on-the-spot test, test when
Between long, experimental variable be difficult to control and defect at high cost；Theoretical calculation restricted application can not calculate more complex non-thread
Property flow phenomenon.In terms of ventilating system research, the above research method is removed, CFD (modern age hydrodynamics) is also used widely.
CFD is to be solved using numerical method by the governing equation of computer Fluid Mechanics, is flowed with this to analyze
Field flow is dynamic.It can overcome the problems, such as that measuring point is limited, and the result of output more fully, can qualitatively and quantitatively divide flow pattern
Analysis.CFD has the characteristics that time saving, laborsaving, economical and efficient, is being widely used in work China Democratic National Construction Association in the research of ventilating system.But
Research in compost ventilating system is more rare.Before carrying out CFD simulation, in order to reduce number of grid, when reducing calculating
Between, it needs to carry out Rational Simplification to heap body Model.For loose porous compost substrate, feasible model simplification mode it
One is to be reduced to porous media.And be to apply to porous media model in heap body environmental simulation, it needs to calculate porous
The resistance coefficient of medium.Resistance coefficient is obtained by returning air-flow intake velocity and air-flow by the differential static pressure after heap body.Due to
Heap body can change in entire composting process porosity, thus need different composting periods to the gas-flow resistance of heap body into
Row measurement.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of heap body measure of resistance device and resistance coefficient acquisition sides
Method can obtain the resistance and resistance coefficient of entire composting period heap body, easy to operate, practical, and to composting process shadow
Sound is smaller.
To achieve the above object, the present invention takes following technical scheme: a kind of heap body measure of resistance device comprising wind-tunnel
Main body, ventilation quantity collection system, metal perforated plate container, ventilating system, air inlet air-flow temperature control regulating system and air-flow static pressure difference are surveyed
Amount system；The wind-tunnel main body is by outlet section, the first Wind Tunnel Contraction, the first wind-tunnel stable section, test chamber, the second wind-tunnel
Stable section, the second Wind Tunnel Contraction and inducer are constituted；The outlet section successively with first Wind Tunnel Contraction, described first
Wind-tunnel stable section, the test chamber, the second wind-tunnel stable section, the inducer and second Wind Tunnel Contraction connect
It connects；It is provided with the ventilation quantity collection system at the outlet section, and is provided with the gold in the test chamber
Belong to orifice plate container, the ventilating system connect with the metal perforated plate container, the air inlet air-flow temperature control regulating system and described
Air-flow static pressure difference measuring system is all connect with the test chamber.
Further, the ventilation quantity collection system include negative pressure wind tunnel fan, wind tunnel fan frequency converter, wind tunnel flow rate meter and
Flow data collector instrument；The exit of the outlet section, the control of the negative pressure wind tunnel fan is arranged in the negative pressure wind tunnel fan
End processed is connect with the wind tunnel fan frequency converter；The wind tunnel flow rate meter, the wind are provided on the outlet section side wall
Air quantity data in the collected outlet section are transmitted to the flow data collector instrument by hole flowmeter.
Further, the ventilating system include compositing system ventilation shaft, compost divulge information positive pressure fan, ventilation frequency converter and
PLC；Compositing system ventilation shaft one end is located at the bottom of the metal perforated plate container, fills in the metal perforated plate container
Compost；The divulge information outlet of positive pressure fan of the compositing system ventilation shaft other end and the compost is connect, the compost ventilation
The control terminal of positive pressure fan is connect through the ventilation frequency converter with the PLC.
Further, it is provided on the compositing system ventilation shaft of the metal perforated plate container bottom several small
Hole.
Further, the air inlet air-flow temperature control regulating system includes air inlet flow type calorifier, heating frequency converter, inlet air temperature
Probe, heap temperature probe, display and the PLC；The front end of the inducer is arranged in the wind flow type calorifier, described
The control terminal of wind flow type calorifier is connect through the heating frequency converter with the PLC；In the test chamber, described
Metal perforated plate external container is provided with the inlet air temperature probe close to the inducer side；Positioned at the metal perforated plate container
In compost, it is provided with several heap temperature probes；The inlet air temperature probe and heap temperature probe will collect
Temperature information be transmitted to the PLC, the PLC controls the heating frequency converter work according to the information received；It is described into
Air temperature probe and the collected temperature information of heap temperature probe are also transmitted to the display.
Further, the air-flow static pressure difference measuring system includes pressure probe, differential manometer and data collector；Positioned at described
In second wind-tunnel stable section, it is provided with the pressure probe at the test chamber, the institute in the test chamber
It states metal perforated plate external container and is also equipped with the pressure probe at the first wind-tunnel stable section；The pressure probe will
The pressure signal detected is transmitted to the data collector through the differential manometer.
Further, the air inlet of the inducer is provided with honeycomb.
Further, two pieces of damping screens are provided on the inside of the honeycomb of the inducer.
A kind of heap body resistance coefficient acquisition methods based on above-mentioned apparatus comprising following steps: 1) in metal perforated plate hold
When device is blank state, corresponding test chamber gas is measured respectively in the wind-tunnel ventilation quantity of at least five grade
Flow resistance power；2) compost will be filled in metal perforated plate container, in wind-tunnel ventilation quantity identical with step 1) respectively measurement with
Corresponding test chamber gas-flow resistance under this wind speed；3) it is popped one's head in and the measured temperature of inlet air temperature probe according to heap temperature,
Regulate and control heating frequency converter operation by PLC, so that the power of air inlet flow type calorifier is adjusted, so that inlet air temperature and heap temperature
Indifference；Negative pressure wind-tunnel fan delivery is adjusted by wind tunnel fan frequency converter, weight identical as ventilation quantity in step 1), step 2)
Multiple step 1) obtains passing through the resistance of test chamber in a certain composting period air-flow under different ventilation quantities；4) by metal perforated plate
When container 1 is respectively vacant and fills heap body, the gas-flow resistance obtained in identical ventilation quantity is subtracted each other, and is taken absolute value, can
Obtain the gas-flow resistance of the heap body in different ventilation quantities；5) according to the relationship of tunnel airstream flow and wind-tunnel intake velocity
Formula obtains the corresponding intake velocity of different ventilation quantities；Heap body resistance under different intake velocities and corresponding situation is subjected to unitary
Quadratic regression, and it is zero that constant term, which is arranged, obtains the resistance coefficient in a certain composting period heap body；6) change in heap body quantity of heat production
When amplitude is 10% or at 1 day/time, select and get the small value in the two, opens negative pressure wind tunnel fan, repeatedly step 1) is obtained to step 5)
To the resistance coefficient of compost all stage heap body.
Further, the relational expression of tunnel airstream flow and wind-tunnel intake velocity are as follows: Q=VS, in formula, Q is tunnel airstream stream
Amount, unit m3s-1；V is test chamber air velocity, and unit is m s-1；S is test chamber sectional area, unit m2。
The invention adopts the above technical scheme, which has the following advantages: 1, the present invention uses forced draft, and heap body is logical
Air quantity is adjusted according to heap body internal temperature, consistent with practical compost situation.2, wind-tunnel inlet air temperature of the invention is according in heap body
Portion's temperature is adjusted, and avoids wind-tunnel ventilation from taking away heap body heat content, influences composting process.3, the present invention can be to entire composting process
Heap body resistance is measured, and obtains resistance coefficient, easy to operate, practical.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is honeycomb structural schematic diagram of the invention；
Fig. 3 is damping screen structural schematic diagram of the invention；
Fig. 4 is compost ventilating system air hose floor map of the invention.
Specific embodiment
In the description of the present invention, it is to be understood that, the orientation or position of the instructions such as term " on ", "lower" "inner", "outside"
Setting relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplification of the description, rather than
The device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot
It is interpreted as limitation of the present invention.The present invention is described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figure 1 to 4, the present invention provides a kind of heap body measure of resistance device comprising wind-tunnel main body, ventilation quantity are adopted
Collecting system, metal perforated plate container 1, ventilating system, air inlet air-flow temperature control regulating system and air-flow static pressure difference measuring system.Wind-tunnel master
Body is by outlet section 2, the first Wind Tunnel Contraction 3, the first wind-tunnel stable section 4, test chamber 5, the second wind-tunnel stable section 6, second
Wind Tunnel Contraction 7 and inducer 8 are constituted；Outlet section 2 is successively tried with the first Wind Tunnel Contraction 3, the first wind-tunnel stable section 4, wind-tunnel
Test section 5, the second wind-tunnel stable section 6, inducer 8 and the connection of the second Wind Tunnel Contraction 7.Ventilation quantity is provided at outlet section 2
Acquisition system, and metal perforated plate container 1 is provided in test chamber 5, ventilating system is connect with metal perforated plate container 1.Into
General mood stream temperature control regulating system and air-flow static pressure difference measuring system are all connect with test chamber 5.
In a preferred embodiment, ventilation quantity collection system includes negative pressure wind tunnel fan 9, wind tunnel fan frequency converter
10, wind tunnel flow rate meter 11 and flow data collector instrument 12.The exit of outlet section 2, negative pressure wind-tunnel is arranged in negative pressure wind tunnel fan 9
The control terminal of blower 9 is connect with wind tunnel fan frequency converter 10, and the ventilation of negative pressure wind tunnel fan 9 is adjusted by wind tunnel fan frequency converter 10
Amount；It is provided with wind tunnel flow rate meter 11 on 2 side wall of outlet section, wind tunnel flow rate meter 11 is by air quantity number in collected outlet section 2
According to flow data collector instrument 12 is transmitted to, the ventilation quantity of wind-tunnel main body is obtained by flow data collector instrument 12.
In a preferred embodiment, ventilating system includes compositing system ventilation shaft 13, the positive pressure fan of compost ventilation
14, divulge information frequency converter 15 and PLC 16.13 one end of compositing system ventilation shaft is located at the bottom of metal perforated plate container 1, metal aperture
Compost is filled in plate container 1；The divulge information outlet of positive pressure fan 14 of 13 other end of compositing system ventilation shaft and compost is connect, compost
The control terminal of positive pressure fan 14 of divulging information is connect through ventilation frequency converter 15 with PLC 16.In use, the control ventilation frequency converter of PLC 16
15 work control compost by ventilation frequency converter 15 and divulge information the ventilation quantity of positive pressure fan 14；It is controlled by PLC 16, compost is divulged information just
For pressure fan 14 in addition to closing during heap body determination of resistance to airflow, remaining time is normally-open.
In above-described embodiment, it is provided on the compositing system ventilation shaft 13 of 1 bottom of metal perforated plate container several small
Hole.Air-flow is divulged information in the positive feeding of pressure fan 14 compositing system ventilation shaft 13 by compost, and air-flow is in compositing system ventilation shaft 13
Middle flow direction is as shown in figure 4, air-flow enters compost by several apertures.
In a preferred embodiment, air inlet air-flow temperature control regulating system includes air inlet flow type calorifier 17, heating change
Frequency device 18, inlet air temperature probe 19, heap temperature probe 20, display 21 and PLC 16.Wind flow type calorifier 17 setting into
The front end of mouth section 8, to ensure that wind-tunnel inlet air temperature is consistent with heap body internal temperature；The control terminal of wind flow type calorifier 17 is heated
Frequency converter 18 is connect with PLC 16, and heating frequency converter 18 realizes the tune to 17 power of wind flow type calorifier under the control of PLC 16
Section.In test chamber 5,8 side of inducer is provided with inlet air temperature probe 19 in 1 outside of metal perforated plate container；Position
In in the compost of metal perforated plate container 1, being provided with several heap temperatures probe 20.Inlet air temperature probe 19 and heap temperature probe
Collected temperature information is transmitted to PLC 16 by 20, by PLC 16 according to information control heating 18 work of frequency converter received
Make.Wherein, inlet air temperature probe 19 and heap temperature 20 collected temperature informations of probe are also transmitted in display 21 and carry out
Data real-time display.
In a preferred embodiment, air-flow static pressure difference measuring system includes pressure probe 22, differential manometer 23 and data
Collector 24.In the second wind-tunnel stable section 6, it is provided with pressure probe 22 at test chamber 5, in test chamber
1 outside of metal perforated plate container is also equipped with pressure probe 22 at the first wind-tunnel stable section 4 in 5；Pressure probe 22 will test
To pressure signal be transmitted in data collector 24 through differential manometer 23, and then obtain divulging information what positive pressure fan 14 conveyed in compost
Ventilation quantity downstream passes through the gas-flow resistance of test chamber 5.
In the various embodiments described above, the air inlet of inducer 8 is provided with honeycomb 25 (as shown in Figure 2), the honeycomb
Device 25 is made of the bee hole of several hexagonal sections, for reducing air stream turbulence degree.
In the various embodiments described above, two pieces of damping screens 26 are provided on the inside of the honeycomb 25 of inducer 8.To ensure to damp
The turbulent flow reducing effect of net 26 should ensure that the ratio between mesh area and gross area of damping screen 26 are greater than 0.57, two pieces of damping screens 26
The distance between should be greater than 30 times of mesh width (as shown in Figure 3).
In the various embodiments described above, test chamber 5 is wider than 1m, tall and big in 1m, long to be greater than 1m, can accommodate minimum 1m ×
The metal perforated plate container 1 of 1m × 1m, it is ensured that compost activity is normally carried out.
In the various embodiments described above, the surface of the second Wind Tunnel Contraction 7 is smooth, and thickness is greater than 0.5m, most greatly enhances and is wider than
2.8m, to guarantee to reduce the effect of air inlet air stream turbulence degree.
In the various embodiments described above, 6 length of the second wind-tunnel stable section is not less than 2m, and 4 length of the first wind-tunnel stable section is not less than
3.5m；The angle of throat (full-shape) of first Wind Tunnel Contraction 3 is greater than 10 °, and shrinkage ratio is less than 3, to ensure that air-flow enters wind tunnel test
Stable state is in after section 5, in wind-tunnel exit without reflux, contraction section hole wall airless separation.
Based on above-mentioned apparatus, the present invention also provides a kind of heap body resistance coefficient acquisition methods comprising following steps:
1) it when metal perforated plate container 1 is blank state, is measured respectively in the wind-tunnel ventilation quantity of at least five grade
Corresponding test chamber gas-flow resistance；
Specifically: divulge information positive pressure fan 14, ventilation frequency converter 15, compositing system ventilation shaft 13 and wind-tunnel of compost is entered the wind
Flow type calorifier 17 is closed；Negative pressure wind tunnel fan 9 is opened, wind-tunnel main body intake is adjusted by wind tunnel fan frequency converter 10, is led to
It crosses wind tunnel flow rate meter 11 and flow data collector instrument 12 obtains the ventilation quantity of wind-tunnel main body, pass through differential manometer 23 and data collector
24 obtain the gas-flow resistance that different ventilation quantity downstreams pass through test chamber 5.
2) compost will be filled in metal perforated plate container 1, is measured respectively in wind-tunnel ventilation quantity identical with step 1)
The test chamber gas-flow resistance under this wind speed；
Wherein, to guarantee that composting process is normally carried out, the ventilation quantity of the positive pressure fan 10 of compost is according to heap temperature probe 20
The temperature measured is adjusted by ventilation frequency converter 15；
It is controlled by PLC 16, positive 10 forced draft of pressure fan of compost is removed and closed during heap body determination of resistance to airflow
Outside, remaining time is normally-open.
3) during heap body drag measurement, to prevent air inlet gas flow temperature with heap temperature, there are the excessive temperature difference, so that
Heap body heat content is taken away in wind-tunnel ventilation, influences composting process progress.It is surveyed according to heap temperature probe 20 and inlet air temperature probe 19
Temperature is obtained, heating frequency converter 18 is regulated and controled by PLC 16 and is run, so that the power of air inlet flow type calorifier 17 is adjusted, so that entering the wind
Temperature and heap temperature indifference.By wind tunnel fan frequency converter 10, negative pressure wind-tunnel fan delivery 7 is adjusted, with step 1), step
2) ventilation quantity is identical in.Step 1) is repeated, is obtained under different ventilation quantities in a certain composting period air-flow by test chamber
Resistance.
It 4) by metal perforated plate container 1 is respectively vacant and when filling heap body, the air-flow obtained in identical ventilation quantity
Resistance subtracts each other, and takes absolute value, and the gas-flow resistance of the heap body in different ventilation quantities can be obtained.
5) according to the relational expression of tunnel airstream flow and wind-tunnel intake velocity, the corresponding air inlet speed of different ventilation quantities can be obtained
Degree.According to formula (2), the heap body resistance under different intake velocities and corresponding situation is subjected to One- place 2-th Order recurrence, and constant is set
Item is zero, and the resistance coefficient in a certain composting period heap body can be obtained；
The relational expression of tunnel airstream flow and wind-tunnel intake velocity are as follows:
Q=VS (1)
In formula, Q is tunnel airstream flow, unit m3s-1；V is test chamber air velocity, and unit is m s-1；S is
Test chamber sectional area, unit m2；
CFD simulation for porous media is that one source item of addition, this source item include on the right of navier stokes equations
Two parts: viscosity loss item and inertia lose item.
In formula, Δ PiPass through the pressure drop after heap body, unit Pa for air-flow；ΔxiFor along airflow direction heap body length, unit
For m；| v | it is velocity amplitude, unit is m s-1；DiAnd CiIt is material in i (the set viscosity in x, y or z) direction and inertia resistance system
Number, unit is respectively m-2And m-1；viIt is that (intake velocity in x, y or z) direction, unit are m s in i-1；μ is that the power of air is viscous
Degree, unit are N s m-2；ρ is gas density, and unit is kg m-3.For the laminar flow in porous media, viscosity loss Xiang Zhanzhu
Status is led, and when air inlet air velocity is larger, inertia loss item is in leading position.
It 6) is to obtain different composting periods, the resistance coefficient of heap body, when heap body quantity of heat production amplitude of variation is 10%, or
At 1 day/time, choosing gets the small value in the two, opens negative pressure wind tunnel fan 9, repeats step 1) to step 5), the entire rank of compost can be obtained
The resistance coefficient of section heap body.
The various embodiments described above are merely to illustrate the present invention, and structure and size, setting position and the step of each component are all can be with
It is varied, based on the technical solution of the present invention, all principles according to the present invention change individual part and step
Into and equivalents, should not exclude except protection scope of the present invention.
Claims (10)
1. a kind of heap body measure of resistance device, it is characterised in that: hold including wind-tunnel main body, ventilation quantity collection system, metal perforated plate
Device, ventilating system, air inlet air-flow temperature control regulating system and air-flow static pressure difference measuring system；The wind-tunnel main body is by outlet section,
One Wind Tunnel Contraction, the first wind-tunnel stable section, test chamber, the second wind-tunnel stable section, the second Wind Tunnel Contraction and inducer
It constitutes；The outlet section successively with first Wind Tunnel Contraction, the first wind-tunnel stable section, the test chamber, institute
State the second wind-tunnel stable section, the inducer is connected with second Wind Tunnel Contraction；It is arranged at the outlet section
Ventilation quantity collection system is stated, and is provided with the metal perforated plate container, the ventilating system and institute in the test chamber
State the connection of metal perforated plate container, the air inlet air-flow temperature control regulating system and the air-flow static pressure difference measuring system all with the wind
The connection of hole test section.
2. device as described in claim 1, it is characterised in that: the ventilation quantity collection system includes negative pressure wind tunnel fan, wind-tunnel
Fan frequency converter, wind tunnel flow rate meter and flow data collector instrument；The outlet of the outlet section is arranged in the negative pressure wind tunnel fan
Place, the control terminal of the negative pressure wind tunnel fan are connect with the wind tunnel fan frequency converter；It is arranged on the outlet section side wall
There is the wind tunnel flow rate meter, air quantity data in the collected outlet section are transmitted to the flow number by the wind tunnel flow rate meter
According to Acquisition Instrument.
3. device as described in claim 1, it is characterised in that: the ventilating system includes that compositing system ventilation shaft, compost are logical
The positive pressure fan of wind, ventilation frequency converter and PLC；Compositing system ventilation shaft one end is located at the bottom of the metal perforated plate container
Portion fills compost in the metal perforated plate container；The compositing system ventilation shaft other end and compost ventilation positive pressure wind
The outlet of machine connects, and the divulge information control terminal of positive pressure fan of the compost is connect through the ventilation frequency converter with the PLC.
4. device as claimed in claim 3, it is characterised in that: the compositing system positioned at the metal perforated plate container bottom is logical
Several apertures are provided in air piping.
5. device as claimed in claim 3, it is characterised in that: the air inlet air-flow temperature control regulating system includes air inlet air-flow heating
Device, heating frequency converter, inlet air temperature probe, heap temperature probe, display and the PLC；The wind flow type calorifier setting
In the front end of the inducer, the control terminal of the wind flow type calorifier is connect through the heating frequency converter with the PLC；It is located at
In the test chamber, the inducer side is provided with the inlet air temperature in the metal perforated plate external container and visits
Head；In the compost of the metal perforated plate container, it is provided with several heap temperature probes；Inlet air temperature probe and
Collected temperature information is transmitted to the PLC by the heap temperature probe, and the PLC controls institute according to the information received
State heating frequency converter work；The inlet air temperature probe and the collected temperature information of heap temperature probe are also transmitted to institute
State display.
6. device as described in claim 1, it is characterised in that: the air-flow static pressure difference measuring system includes pressure probe, pressure difference
Meter and data collector；In the second wind-tunnel stable section, it is provided with the pressure at the test chamber and visits
Head, the metal perforated plate external container is also equipped with described at the first wind-tunnel stable section in the test chamber
Pressure probe；The pressure signal that the pressure probe will test is transmitted to the data collector through the differential manometer.
7. such as any one of claim 1 to 6 described device, it is characterised in that: the air inlet of the inducer is provided with honeycomb
Device.
8. device as claimed in claim 7, it is characterised in that: be provided with two pieces on the inside of the honeycomb of the inducer
Damping screen.
9. a kind of heap body resistance coefficient acquisition methods based on any one of such as claim 1 to 8 described device, it is characterised in that packet
Include following steps:
1) it when metal perforated plate container is blank state, is measured respectively therewith in the wind-tunnel ventilation quantity of at least five grade
Corresponding test chamber gas-flow resistance；
2) compost will be filled in metal perforated plate container, is measured and this wind respectively in wind-tunnel ventilation quantity identical with step 1)
Corresponding test chamber gas-flow resistance under speed；
3) according to heap temperature probe and the measured temperature of inlet air temperature probe, heating frequency converter operation is regulated and controled by PLC, thus
The power of air inlet flow type calorifier is adjusted, so that inlet air temperature and heap temperature indifference；It is adjusted by wind tunnel fan frequency converter
Negative pressure wind-tunnel fan delivery, it is identical as ventilation quantity in step 1), step 2), step 1) is repeated, is obtained under different ventilation quantities at certain
One compost stage gas stream passes through the resistance of test chamber；
It 4) by metal perforated plate container 1 is respectively vacant and when filling heap body, the gas-flow resistance obtained in identical ventilation quantity
Subtract each other, take absolute value, the gas-flow resistance of the heap body in different ventilation quantities can be obtained；
5) according to the relational expression of tunnel airstream flow and wind-tunnel intake velocity, the corresponding intake velocity of different ventilation quantities is obtained；It will
Heap body resistance under different intake velocities and corresponding situation carries out One- place 2-th Order recurrence, and it is zero that constant term, which is arranged, is obtained at certain
The resistance coefficient of one composting period heap body；
6) when heap body quantity of heat production amplitude of variation is 10% or at 1 day/time, select and get the small value in the two, unlatching negative pressure wind-tunnel wind
Machine repeats step 1) to step 5), obtains the resistance coefficient of compost all stage heap body.
10. method as claimed in claim 9, it is characterised in that: the relational expression of tunnel airstream flow and wind-tunnel intake velocity are as follows:
Q=VS
In formula, Q is tunnel airstream flow, unit m3s-1；V is test chamber air velocity, and unit is m s-1；S is wind-tunnel
Test section sectional area, unit m2。
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