CN108979697B - The air-supply vertical shaft fresh-air volume reduction coefficient calculation method of tunnel open circulation ventilation - Google Patents
The air-supply vertical shaft fresh-air volume reduction coefficient calculation method of tunnel open circulation ventilation Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/003—Ventilation of traffic tunnels
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/08—Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
- E21F5/20—Drawing-off or depositing dust
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/02—Agriculture; Fishing; Mining
Abstract
The invention discloses a kind of air-supply vertical shaft fresh-air volume reduction coefficient calculation methods of tunnel open circulation ventilation.The method of the present invention is mainly: firstly, determining the equivalent fresh air volume calculating formula for flowing through recirculating air flow after deduster purifies；In Controlled Recirculation Ventilation system, carries out air-supply vertical shaft and be sent into fresh air volume equal to exhaust air shaft discharge waste air amount, determine the equivalent fresh air volume calculating formula that air-supply vertical shaft is sent into；In Controlled Recirculation Ventilation system, the equivalent fresh air volume calculating formula of exhaust air shaft discharge is determined；According to the conservation principle in physics, in Controlled Recirculation Ventilation system, using three above formula, the calculating formula of the equivalent fresh air volume of circulation air path injection section is obtained；The calculating formula of air-supply vertical shaft fresh-air volume reduction coefficient in Controlled Recirculation Ventilation system is therefrom obtained again.When the air-supply vertical shaft fresh-air volume reduction coefficient of open type Controlled Recirculation Ventilation system is less than 1, implementing Controlled Recirculation Ventilation system can be reduced practical supply and exhaust air quantity.
Description
Technical field
The invention belongs to tunnel hazard prevention mitigation technical fields, and in particular to one kind is controllably followed for Extra-long Highway Tunnel open type
The calculation method of the air-supply vertical shaft fresh-air volume reduction coefficient of ring ventilation.
Background technique
Vcehicular tunnel is half sunken or shallow embedding long and narrow space, administers the dirts such as flue dust caused by the automobile travelled in tunnel
Object is contaminated, is always the major issue of industry concern.The general method for using force ventilation dilutes the pollutants such as flue dust and CO, dirty
Wind drains into tunnel external environment, and belongs to direct air system scheme.The ventilating system of long range or speciality apart from vcehicular tunnel,
Air shaft must be cooperated, be just able to satisfy the use wind demand for diluting pollutant in tunnel.Extra-long Highway Tunnel ventilation is specifically related to
The optimization of the influence factors such as shaft excavation position, ventilation blower, jet blower group and air duct is the advanced problems in industry.
Currently, extraneous fresh air is introduced tunnel, then the pollutant of dilution vehicle discharge waste air is discharged outside hole,
This is the high conventional tunnel ventilation of energy consumption.Using vertical shaft air zoning, extraneous fresh air is introduced, the dirt in super long tunnel is diluted
Object is contaminated, and ensures its concentration within safety value, finally, waste air is discharged by segmentation vertical shaft；The practice such as Kwa G S and Xia Yongxu
Common vertical shaft is segmented supply and exhaust Tunnel Ventilation Systems.For the traffic air that tunnel middle rolling car is formed, Fang Lei and Wang etc. are answered
With the method for model test, show that air outlet and tunnel direction of traffic preferably take 6 °, and the folder of exhaust outlet and tunnel direction of traffic
Angle should be not more than 30 °；Then, Fang Lei etc. explicitly points out ventilation shaft longitudinal pressure-suction ventilation system and always exists civil engineering costs and fortune
Capable the problem of energy consumption is high.For ventilation shaft project cost is high or super long tunnel without setting condition, the ventilation of upper and lower line is utilized
The uneven characteristic of load, Berner etc. have been put forward for the first time double hole complementation ventilations；Using model experiment and numerical simulation, Zhang Guangpeng is tested
Design parameter is demonstrate,proved and has checked, and the complementary ventilatory applications in double holes in silk screen tunnel；It is surveyed by experiment, Wang Yaqiong etc. is deep
Enter the tunnel flow field having studied under double complementary ventilations in hole, further demonstrates the feasibility of the draft type, and general
In the case of double hole complementation draft types be suitable for the vcehicular tunnel of 4km~7km.The at high cost and vertical shaft but super long tunnel is divulged information
The problems such as position is restricted by geology, urban planning is excavated, is still protruded, and controllably recycles and leads to for Extra-long Highway Tunnel open type
The calculation method of the air-supply vertical shaft fresh-air volume reduction coefficient of wind is not yet formed.
Summary of the invention
The purpose of the present invention is to provide a kind of air-supply vertical shaft fresh-air volume reduction coefficient meters of tunnel open circulation ventilation
Calculation method, thus the faster Pre-Evaluation completing open circulation ventilating system and implementing.
Above-mentioned purpose of the invention determines by the following technical solutions: the air-supply of tunnel open circulation ventilation
Vertical shaft fresh-air volume reduction coefficient calculation method is the air-supply vertical shaft for Extra-long Highway Tunnel open type Controlled Recirculation Ventilation system
Fresh-air volume reduction coefficient calculates；The Extra-long Highway Tunnel open type Controlled Recirculation Ventilation system includes being set to tunnel bypass tunnel
Hole and the circulation air path for being parallel to tunnel are upstream tunnels between the air inducing section of tunnel portal to circulation air path, circulation air path
Injection section is to being downstream tunnels between tunnel exit, and circulation air path passes through the air inducing section at its both ends and injection section is connected to tunnel,
It is that tunnel is short-track between upstream tunnels and downstream tunnels；Deduster is equipped in circulation air path；The air inducing Duan Yiyu tunnel of circulation air path
The inlet communication for the exhaust air shaft being equipped in road by-pass tunnel is equipped with exhaust fan in exhaust air shaft；The injection section of circulation air path
Also with the outlet for the air-supply vertical shaft being equipped in tunnel by-pass tunnel, breeze fan is equipped in vertical shaft of blowing；
It is characterized by comprising following steps:
(1) determine that the equivalent fresh air volume calculating formula of recirculating air flow after flowing through deduster purification is as follows:
Qeff(η)=η ω keQr(1)；
In formula (1), Qeff(η)For the equivalent fresh air volume of recirculating air flow after purification, m3/s；QrIt is outer for what is introduced from tunnel portal
The fresh distinguished and admirable air quantity in boundary, m3/s；K is cycling rate, dimensionless number；E is to divide wind than number, dimensionless number；ω is the effective wind of deduster
Coefficient of discharge, dimensionless number；η is deduster clarifying smoke efficiency, dimensionless number；
(2) it in Controlled Recirculation Ventilation system, carries out air-supply vertical shaft and is sent into fresh air volume equal to exhaust air shaft discharge waste air
Amount, the equivalent fresh air volume calculating formula for determining that air-supply vertical shaft is sent into are as follows:
Qeff(s)=(1-k) eQr(2)；
In formula (2), Qeff(s)For the equivalent fresh air volume that air-supply vertical shaft is sent into, m3/s；
(3) in Controlled Recirculation Ventilation system, determine that the equivalent fresh air volume calculating formula of exhaust air shaft discharge is as follows:
Qeff(e)=(1- ω) (1-k) eQr(3)；
In formula (3), Qeff(e)For the equivalent fresh air volume that exhaust air shaft is drained, m3/s；
(4) according to the conservation principle in physics, in Controlled Recirculation Ventilation system, applying equation (1), formula (2) and formula
(3), the calculating formula for obtaining the equivalent fresh air volume of circulation air path injection section is as follows:
Qeff=Qeff(η)+Qeff(s)-Qeff(e)=[1-k (1- η)] ω eQr(4)；
In formula (4), QeffFor the equivalent fresh air volume of circulation air path injection section, m3/s；
(5) calculating of air-supply vertical shaft fresh-air volume reduction coefficient；
For the supply and exhaust vertical shaft ventilation side of Controlled Recirculation Ventilation system and conventional deduster not set in circulation air path
For formula, in the identical situation of independent variable for influencing dilution flue dust institute required airflow, then Controlled Recirculation Ventilation system and supply and exhaust
Corresponding point of wind of vertical shaft draft type is more equal than number, and the fresh distinguished and admirable air quantity that the two is introduced from tunnel portal is equal, the two circulation
Rate is equal；Under above-mentioned boundary condition, vertical shaft fresh-air volume reduction of blowing in Controlled Recirculation Ventilation system is obtained from formula (4)
The calculating formula of coefficient is as follows:
In formula (5),For vertical shaft fresh-air volume reduction coefficient of blowing, dimensionless number；
Formula (5) shows when the air-supply vertical shaft fresh-air volume reduction coefficient of open type Controlled Recirculation Ventilation system is less than 1,
Implementing Controlled Recirculation Ventilation system can be reduced practical supply and exhaust air quantity.
Specifically, step (1), (two), (three) Chinese style (1), formula (2), the determination method of formula (3) are as follows:
(I) according to existing engineering calculating method, it is as follows to obtain tunnel flue dust flowmeter formula:
In formula (6), QVIFor tunnel flue dust flow, m2/s；qVIFor flue dust Criterion emission amount, m2/veh·km；fa(VI)To examine
Consider the vehicle condition coefficient of flue dust, dimensionless number；fdFor vehicle flow density factor, dimensionless number；fh(VI)For the height above sea level system for considering flue dust
Number, dimensionless；fiv(VI)For the longitudinal slope-speed coefficient for considering flue dust, dimensionless number；nDFor diesel vehicle vehicle classification number, dimensionless
Number；NmFor the volume of traffic of corresponding vehicle, veh/h；fm(VI)For the diesel vehicle vehicle coefficient for considering flue dust, dimensionless number；L is tunnel
Length, m；
Wherein, the calculating formula of the integrated contributory factor C of flue dust flow are as follows:
In formula (7), C is the integrated contributory factor of flue dust flow, m/s；
In formula (6), when Criterion emission amount is constant and vehicle condition, Che Midu, the gradient, speed, diesel vehicle vehicle are immeasurable
Guiding principle number is constant, and in the case where capable of ignoring and influencing produced by altitude change, then, tunnel flue dust flow is length of tunnel and comprehensive shadow
Ring the function of the factor；
(II) applying equation (6) and formula (7), the distinguished and admirable dust concentration calculating formula in upstream are as follows:
In formula (8), δ is the distinguished and admirable dust concentration in upstream, m-1；L1For the length of upstream tunnels, m；QrFor from tunnel portal
The fresh distinguished and admirable air quantity in the external world of introducing, m3/s；
(III) wind is divided to be determined than number by following formula:
In formula (9), e is to divide wind than number, dimensionless number；Q is to branch to the distinguished and admirable air quantity of circulation air path air inducing section to shunt
To the distinguished and admirable air quantity of circulation air path and exhaust air shaft, m3/s；
For flowing into the distinguished and admirable air quantity of circulation air path air inducing section, a part is drained by exhaust fan, and another part, which enters, to follow
Ring air duct, forms the non-purified recirculating air flow air quantity for flowing into deduster, which accounts for air inducing section air quantity
The ratio of air quantity is cycling rate k, applying equation (9), and the calculating formula of cycling rate k is as follows:
In formula (10), k is cycling rate, dimensionless number；QηFor the non-purified recirculating air flow air quantity for flowing into deduster, m3/s；
(IV) deduster effective wind rate coefficient and the calculation method of clarifying smoke efficiency are as follows:
In order to characterize the influence that recirculating air flow dust concentration utilizes performance of precipitator and its limit, it is effective to define deduster
Air volume coefficient is that the distinguished and admirable dust concentration in dust concentration, that is, upstream of the inflow non-purified recirculating air flow of deduster is set with dust concentration
The ratio for counting feasible value, is shown below:
In formula (11), ω is deduster effective wind rate coefficient, dimensionless number；δ is the distinguished and admirable dust concentration in upstream, m-1；δ0
For the flue dust acceptable concentration of Design of ventilation, m-1；
Deduster clarifying smoke efficiency calculation formula is as follows:
In formula (12), δeff(η)For purified recirculating air flow dust concentration, m-1；
(V) by above-mentioned derivation, the equivalent fresh air volume calculating formula such as formula (1) of recirculating air flow after flowing through deduster purification is determined:
Qeff(η)=η ω keQr(1)；
In formula (1), Qeff(η)For the equivalent fresh air volume of recirculating air flow after purification, m3/s；
(VI) by above-mentioned derivation, in Controlled Recirculation Ventilation system, it is perpendicular equal to air draft to carry out air-supply vertical shaft feeding fresh air volume
Waste air amount is discharged in well, determines the equivalent fresh air volume calculating formula such as formula (2) that air-supply vertical shaft is sent into:
Qeff(s)=(1-k) eQr(2)；
In formula (2), Qeff(s)For the equivalent fresh air volume that air-supply vertical shaft is sent into, m3/s；
(VII) by above-mentioned derivation, in Controlled Recirculation Ventilation system, determine that the equivalent fresh air volume of exhaust air shaft discharge calculates
Formula such as formula (3):
Qeff(e)=(1- ω) (1-k) eQr(3)；
In formula (3), Qeff(e)For the equivalent fresh air volume that exhaust air shaft is drained, m3/s。
Compared with prior art, the present invention beneficial effect embodiment is as follows:
The present invention can be based on the air-supply vertical shaft fresh-air volume reduction coefficient of Extra-long Highway Tunnel open type Controlled Recirculation Ventilation
Calculate, be avoided that length of tunnel, section scale etc. have the troublesome calculation of dimensions number parameter perhaps ventilating system network resolve or
Numerous and jumbled time-consuming computational fluid dynamics numerical simulation, the faster energy conservation for estimating out implementation Controlled Recirculation Ventilation system are latent
Power.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of Extra-long Highway Tunnel open type Controlled Recirculation Ventilation system of the present invention.
Fig. 2 is the distinguished and admirable schematic illustration of Extra-long Highway Tunnel open type Controlled Recirculation Ventilation system of the present invention.
Fig. 3 be in embodiment of the present invention method cycling rate to the influence curve figure of fresh-air volume reduction coefficient.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
Referring to Fig. 1, Fig. 2, Extra-long Highway Tunnel open type Controlled Recirculation Ventilation system include be set to tunnel by-pass tunnel and
It is parallel to the circulation air path 5 in tunnel, is upstream tunnels 2, circulation air path 5 between the air inducing section B of tunnel portal 1 to circulation air path 5
Injection section E to being downstream tunnels 8 between tunnel exit 9, circulation air path 5 passes through the air inducing section B and injection section E and tunnel at its both ends
Road connection, is tunnel short-track 14 between upstream tunnels 2 and downstream tunnels 8；Deduster is equipped in circulation air path 5,11 be deduster
Outlet, 12 be deduster entrance；The air inducing section B of the circulation air path 5 also import with the exhaust air shaft 3 being equipped in tunnel by-pass tunnel
It is connected to, it is air draft well head that exhaust fan 13,4 is equipped in exhaust air shaft 3；The injection section E of circulation air path 5 also with tunnel by-pass tunnel
In be equipped with air-supply vertical shaft 7 outlet, blow vertical shaft 7 in be equipped with breeze fan 10,6 be air-supply well head.
Open type Controlled Recirculation Ventilation system of the present invention is in use, introduce the fresh wind of tunnel external environment by tunnel portal 1
H is flowed, the upstream tunnels 2 of circulation air path are flowed through, constantly blending and the carrying pollutants such as flue dust and CO becomes the distinguished and admirable A in upstream.Upstream
A part in distinguished and admirable A flows into tunnel short-track 14, continues to dilute pollutant, becomes distinguished and admirable G in parallel.The distinguished and admirable A in another part upstream
Section B is introduced by circulation air path, flows into circulation air path 5 and exhaust air shaft 3, a part for flowing into circulation air path 5 is referred to as non-purified
Recirculating air flow C, a part for flowing into exhaust air shaft 3 are known as the waste air I of exhaust air shaft；The dirt of exhaust air shaft in exhaust air shaft 3
Wind I, by air draft well head 4, drains into tunnel external environment under the action of exhaust fan 13.Non-purified recirculating air flow C is in deduster
Under effect, circulation air path 5 is flowed into, deduster entrance 12 is flowed through, is stripped of the particles pollutant such as flue dust by deduster, obtains
Purified treatment flows out house outlet 11, is converted into recirculating air flow D after purification.
The fresh air H of tunnel external environment outside air-supply well head 6 flows into air-supply vertical shaft 7, referred to as under the effect of breeze fan 10
The fresh air J of air-supply vertical shaft.In the shared air duct of air-supply vertical shaft 7 and circulation air path 5, followed after the fresh air J for vertical shaft of blowing and purification
The distinguished and admirable D mixing of ring, is mixed to get mixing wind.Downstream tunnels 8 in circulation air path injection section E, tunnel short-track 14 and circulation air path
Between common sections, flow through the mixing wind of circulation air path injection section E and complete to blend with the distinguished and admirable G in parallel for flowing through tunnel short-track 14,
It is changed into the distinguished and admirable F in downstream.In the downstream tunnels 8 of circulation air path, the distinguished and admirable F in downstream continues to dilute pollutant, and ensures circulation air path
Downstream tunnels 8 in pollutant concentration be maintained at as defined within safety value, it is ensured that needed with wind.
The present invention is based on the reductions of the air-supply vertical shaft fresh-air volume of above-mentioned Extra-long Highway Tunnel open type Controlled Recirculation Ventilation system
Coefficient calculation method includes the following steps:
(I) according to existing engineering calculating method, it is as follows to obtain tunnel flue dust flowmeter formula:
In formula (6), QVIFor tunnel flue dust flow, m2/s；qVIFor flue dust Criterion emission amount, m2/veh·km；fa(VI)To examine
Consider the vehicle condition coefficient of flue dust, dimensionless number；fdFor vehicle flow density factor, dimensionless number；fh(VI)For the height above sea level system for considering flue dust
Number, dimensionless；fiv(VI)For the longitudinal slope-speed coefficient for considering flue dust, dimensionless number；nDFor diesel vehicle vehicle classification number, dimensionless
Number；NmFor the volume of traffic of corresponding vehicle, veh/h；fm(VI)For the diesel vehicle vehicle coefficient for considering flue dust, dimensionless number；L is tunnel
Length, m；
Wherein, the calculating formula of the integrated contributory factor C of flue dust flow are as follows:
In formula (7), C is the integrated contributory factor of flue dust flow, m/s；
In formula (6), when Criterion emission amount is constant and vehicle condition, Che Midu, the gradient, speed, diesel vehicle vehicle are immeasurable
Guiding principle number is constant, and in the case where capable of ignoring and influencing produced by altitude change, then, tunnel flue dust flow is length of tunnel and comprehensive shadow
Ring the function of the factor；
(II) applying equation (6) and formula (7), the distinguished and admirable dust concentration calculating formula in upstream are as follows:
In formula (8), δ is the distinguished and admirable dust concentration in upstream, m-1；L1For the length of upstream tunnels, m；QrFor from tunnel portal
The fresh distinguished and admirable air quantity in the external world of introducing, m3/s；
(III) wind is divided to be determined than number by following formula:
In formula (9), e is to divide wind than number, dimensionless number；Q is to branch to the distinguished and admirable air quantity of circulation air path air inducing section to shunt
To the distinguished and admirable air quantity of circulation air path and exhaust air shaft, m3/s；
For flowing into the distinguished and admirable air quantity of circulation air path air inducing section, a part is drained by exhaust fan, and another part, which enters, to follow
Ring air duct, forms the non-purified recirculating air flow air quantity for flowing into deduster, which accounts for air inducing section air quantity
The ratio of air quantity is cycling rate k, applying equation (9), and the calculating formula of cycling rate k is as follows:
In formula (10), k is cycling rate, dimensionless number；QηFor the non-purified recirculating air flow air quantity for flowing into deduster, m3/s；
(IV) deduster effective wind rate coefficient and the calculation method of clarifying smoke efficiency are as follows:
In order to characterize the influence that recirculating air flow dust concentration utilizes performance of precipitator and its limit, it is effective to define deduster
Air volume coefficient is that the distinguished and admirable dust concentration in dust concentration, that is, upstream of the inflow non-purified recirculating air flow of deduster is set with dust concentration
The ratio for counting feasible value, is shown below:
In formula (11), ω is deduster effective wind rate coefficient, dimensionless number；δ is the distinguished and admirable dust concentration in upstream, m-1；δ0
For the flue dust acceptable concentration of Design of ventilation, m-1；
Deduster clarifying smoke efficiency calculation formula is as follows:
In formula (12), δeff(η)For purified recirculating air flow dust concentration, m-1；
(V) by above-mentioned derivation, the equivalent fresh air volume calculating formula such as formula (1) of recirculating air flow after flowing through deduster purification is determined:
Qeff(η)=η ω keQr(1)；
In formula (1), Qeff(η) be purification after recirculating air flow equivalent fresh air volume, m3/s；QrIt is outer for what is introduced from tunnel portal
The fresh distinguished and admirable air quantity in boundary, m3/s；K is cycling rate, dimensionless number；E is to divide wind than number, dimensionless number；ω is the effective wind of deduster
Coefficient of discharge, dimensionless number；η is deduster clarifying smoke efficiency, dimensionless number；
(VI) by above-mentioned derivation, in Controlled Recirculation Ventilation system, it is perpendicular equal to air draft to carry out air-supply vertical shaft feeding fresh air volume
Waste air amount is discharged in well, determines the equivalent fresh air volume calculating formula such as formula (2) that air-supply vertical shaft is sent into:
Qeff(s)=(1-k) eQr(2)；
In formula (2), Qeff(s)For the equivalent fresh air volume that air-supply vertical shaft is sent into, m3/s；
(VII) by above-mentioned derivation, in Controlled Recirculation Ventilation system, determine that the equivalent fresh air volume of exhaust air shaft discharge calculates
Formula such as formula (3):
Qeff(e)=(1- ω) (1-k) eQr(3)；
In formula (3), Qeff(e)For the equivalent fresh air volume that exhaust air shaft is drained, m3/s。
(VIII) according to the conservation principle in physics, in Controlled Recirculation Ventilation system, applying equation (1), formula (2) and formula
(3), the calculating formula for obtaining the equivalent fresh air volume of circulation air path injection section is as follows:
Qeff=Qeff(η)+Qeff(s)-Qeff(e)=[1-k (1- η)] ω eQr(4)；
In formula (4), QeffFor the equivalent fresh air volume of circulation air path injection section, m3/s；
(Ⅸ) calculating of air-supply vertical shaft fresh-air volume reduction coefficient:
For the supply and exhaust vertical shaft ventilation side of Controlled Recirculation Ventilation system and conventional deduster not set in circulation air path
For formula, in the identical situation of independent variable for influencing dilution flue dust institute required airflow, then Controlled Recirculation Ventilation system and supply and exhaust
Corresponding point of wind of vertical shaft draft type is more equal than number, and the fresh distinguished and admirable air quantity that the two is introduced from tunnel portal is equal, the two circulation
Rate is equal；Under above-mentioned boundary condition, vertical shaft fresh-air volume reduction of blowing in Controlled Recirculation Ventilation system is obtained from formula (4)
The calculating formula of coefficient is as follows:
In formula (5),For vertical shaft fresh-air volume reduction coefficient of blowing, dimensionless number；
Formula (5) shows blow vertical shaft fresh-air volume reduction coefficient and deduster clarifying smoke efficiency direct ratio, vertical shaft of blowing
Fresh-air volume reduction coefficient and cycling rate inverse ratio；When the air-supply vertical shaft fresh-air volume reduction coefficient of open type Controlled Recirculation Ventilation system
When less than 1, implementing Controlled Recirculation Ventilation system can be reduced practical supply and exhaust air quantity.
Here be determining cycling rate, deduster clarifying smoke efficiency to air-supply vertical shaft fresh-air volume reduction coefficient influence journey
The experiment embodiment of degree, concrete operations are as follows:
(a) setting deduster clarifying smoke efficiency is respectively 0.75,0.80,0.85,0.90 and 0.95；
(b) range of cycling rate is set as 0.0 to 1.0；
(c) above-mentioned numerical value is substituted into formula (5) to calculate, acquired results are as shown in Figure 3.
By analyzing specific embodiment, following conclusion is made: (1) with the increase of cycling rate, fresh-air volume reduction system
Number becomes smaller；As deduster clarifying smoke efficiency increases, fresh-air volume reduction coefficient is bigger.(2) present invention quantified cycling rate,
Influence degree of the deduster clarifying smoke efficiency to air-supply vertical shaft fresh-air volume reduction coefficient.
Claims (1)
1. a kind of air-supply vertical shaft fresh-air volume reduction coefficient calculation method of tunnel open circulation ventilation, is for speciality highway tunnel
The air-supply vertical shaft fresh-air volume reduction coefficient of road open type Controlled Recirculation Ventilation system calculates；The Extra-long Highway Tunnel open type is controllable
Circulating ventilation system includes the circulation air path for being set to tunnel by-pass tunnel and being parallel to tunnel, tunnel portal to circulation air path
It is upstream tunnels between air inducing section, to being downstream tunnels between tunnel exit, circulation air path passes through it for the injection section of circulation air path
The air inducing section and injection section at both ends are connected to tunnel, are that tunnel is short-track between upstream tunnels and downstream tunnels；It is set in circulation air path
There is deduster；The inlet communication for the exhaust air shaft being equipped in the tunnel the air inducing Duan Yiyu by-pass tunnel of circulation air path, exhaust air shaft
In be equipped with exhaust fan；The outlet for the air-supply vertical shaft being equipped in the tunnel the injection Duan Yiyu by-pass tunnel of circulation air path, send
Breeze fan is equipped in wind vertical shaft；
It is characterized by comprising following steps:
(1) determine that the equivalent fresh air volume calculating formula of recirculating air flow after flowing through deduster purification is as follows:
Qeff(η)=η ω keQr(1)；
In formula (1), Qeff(η)For the equivalent fresh air volume of recirculating air flow after purification, m3/s；QrIt is extraneous new for what is introduced from tunnel portal
Fresh distinguished and admirable air quantity, m3/s；K is cycling rate, dimensionless number；E is to divide wind than number, dimensionless number；ω is deduster effective wind rate system
Number, dimensionless number；η is deduster clarifying smoke efficiency, dimensionless number；
(2) it in Controlled Recirculation Ventilation system, carries out air-supply vertical shaft and is sent into fresh air volume equal to exhaust air shaft discharge waste air amount, really
Surely the equivalent fresh air volume calculating formula that air-supply vertical shaft is sent into is as follows:
Qeff(s)=(1-k) eQr(2)；
In formula (2), Qeff(s)For the equivalent fresh air volume that air-supply vertical shaft is sent into, m3/s；
(3) in Controlled Recirculation Ventilation system, determine that the equivalent fresh air volume calculating formula of exhaust air shaft discharge is as follows:
Qeff(e)=(1- ω) (1-k) eQr(3)；
In formula (3), Qeff(e)For the equivalent fresh air volume that exhaust air shaft is drained, m3/s；
(4) according to the conservation principle in physics, in Controlled Recirculation Ventilation system, applying equation (1), formula (2) and formula (3) are obtained
Calculating formula to the equivalent fresh air volume of circulation air path injection section is as follows:
Qeff=Qeff(η)+Qeff(s)-Qeff(e)=[1-k (1- η)] ω eQr(4)；
In formula (4), QeffFor the equivalent fresh air volume of circulation air path injection section, m3/s；
(5) calculating of air-supply vertical shaft fresh-air volume reduction coefficient；
For Controlled Recirculation Ventilation system and conventional deduster not set in circulation air path supply and exhaust vertical shaft draft type and
Speech, in the identical situation of independent variable for influencing dilution flue dust institute required airflow, then Controlled Recirculation Ventilation system and supply and exhaust vertical shaft
Corresponding point of wind of draft type is more equal than number, and the fresh distinguished and admirable air quantity that the two is introduced from tunnel portal is equal, the two cycling rate phase
Deng；Under above-mentioned boundary condition, vertical shaft fresh-air volume reduction coefficient of blowing in Controlled Recirculation Ventilation system is obtained from formula (4)
Calculating formula it is as follows:
In formula (5),For vertical shaft fresh-air volume reduction coefficient of blowing, dimensionless number；
Formula (5) shows when the air-supply vertical shaft fresh-air volume reduction coefficient of open type Controlled Recirculation Ventilation system is less than 1, implements
Controlled Recirculation Ventilation system can be reduced practical supply and exhaust air quantity；
Step (1), (two), (three) Chinese style (1), formula (2), the determination method of formula (3) are as follows:
(I) according to existing engineering calculating method, it is as follows to obtain tunnel flue dust flowmeter formula:
In formula (6), QVIFor tunnel flue dust flow, m2/s；qVIFor flue dust Criterion emission amount, m2/(veh·km)；fa(VI)To consider
The vehicle condition coefficient of flue dust, dimensionless number；fdFor vehicle flow density factor, dimensionless number；fh(VI)For consider flue dust Altitude effects,
Dimensionless；fiv(VI)For the longitudinal slope-speed coefficient for considering flue dust, dimensionless number；nDFor diesel vehicle vehicle classification number, dimensionless number；
NmFor the volume of traffic of corresponding vehicle, veh/h；fm(VI)For the diesel vehicle vehicle coefficient for considering flue dust, dimensionless number；L is that tunnel is long
Degree, m；
Wherein, the calculating formula of the integrated contributory factor C of flue dust flow are as follows:
In formula (7), C is the integrated contributory factor of flue dust flow, m/s；
In formula (6), when Criterion emission amount is constant and vehicle condition, Che Midu, the gradient, speed, diesel vehicle vehicle dimensionless number
It is constant, and in the case where capable of ignoring and influencing produced by altitude change, then, tunnel flue dust flow be length of tunnel and combined influence because
The function of son；
(II) applying equation (6) and formula (7), the distinguished and admirable dust concentration calculating formula in upstream are as follows:
In formula (8), δ is the distinguished and admirable dust concentration in upstream, m-1；L1For the length of upstream tunnels, m；QrIt is introduced from tunnel portal
Extraneous fresh distinguished and admirable air quantity, m3/s；
(III) wind is divided to be determined than number by following formula:
In formula (9), e is to divide wind than number, dimensionless number；Q is to branch to the distinguished and admirable air quantity of circulation air path air inducing section to branch to and follow
The distinguished and admirable air quantity in ring air duct and exhaust air shaft, m3/s；
For flowing into the distinguished and admirable air quantity of circulation air path air inducing section, a part is drained by exhaust fan, and another part enters circulated air
Road, forms the non-purified recirculating air flow air quantity for flowing into deduster, which accounts for air inducing section air quantity air quantity
Ratio be cycling rate k, applying equation (9), the calculating formula of cycling rate k is as follows:
In formula (10), k is cycling rate, dimensionless number；QηFor the non-purified recirculating air flow air quantity for flowing into deduster, m3/s；
(IV) deduster effective wind rate coefficient and the calculation method of clarifying smoke efficiency are as follows:
In order to characterize the influence that recirculating air flow dust concentration utilizes performance of precipitator and its limit, deduster effective wind rate is defined
Coefficient is that the distinguished and admirable dust concentration in dust concentration, that is, upstream of the inflow non-purified recirculating air flow of deduster and dust concentration design are held
Perhaps the ratio being worth, is shown below:
In formula (11), ω is deduster effective wind rate coefficient, dimensionless number；δ is the distinguished and admirable dust concentration in upstream, m-1；δ0It is logical
The flue dust acceptable concentration of wind design, m-1；
Deduster clarifying smoke efficiency calculation formula is as follows:
In formula (12), δeff(η)For purified recirculating air flow dust concentration, m-1；
(V) by above-mentioned derivation, the equivalent fresh air volume calculating formula such as formula (1) of recirculating air flow after flowing through deduster purification is determined:
Qeff(η)=η ω keQr(1)；
In formula (1), Qeff(η)For the equivalent fresh air volume of recirculating air flow after purification, m3/s；
(VI) it by above-mentioned derivation, in Controlled Recirculation Ventilation system, carries out air-supply vertical shaft and is sent into fresh air volume equal to exhaust air shaft row
Waste air amount out determines the equivalent fresh air volume calculating formula such as formula (2) that air-supply vertical shaft is sent into:
Qeff(s)=(1-k) eQr(2)；
In formula (2), Qeff(s)For the equivalent fresh air volume that air-supply vertical shaft is sent into, m3/s；
(VII) by above-mentioned derivation, in Controlled Recirculation Ventilation system, the equivalent fresh air volume calculating formula of exhaust air shaft discharge is determined such as
Formula (3):
Qeff(e)=(1- ω) (1-k) eQr(3)；
In formula (3), Qeff(e)For the equivalent fresh air volume that exhaust air shaft is drained, m3/s。
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