CN108916654A - A kind of safe mixing device of ultralow concentration gas and method - Google Patents
A kind of safe mixing device of ultralow concentration gas and method Download PDFInfo
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- CN108916654A CN108916654A CN201810770812.2A CN201810770812A CN108916654A CN 108916654 A CN108916654 A CN 108916654A CN 201810770812 A CN201810770812 A CN 201810770812A CN 108916654 A CN108916654 A CN 108916654A
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- pipeline
- high concentration
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- inlet duct
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- General Engineering & Computer Science (AREA)
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Abstract
The present invention relates to a kind of safe mixing device of ultralow concentration gas and methods, including being sequentially connected logical inlet flange, inlet duct, the pipeline that narrows, outlet conduit, outlet(discharge) flange；Wherein inlet duct and outlet conduit are the conventional pipeline that diameter is equal, and the pipeline that narrows connects that inlet duct side diameter is identical with inlet duct, and connection outlet pipeline side diameter is small, the junction pipe diameter mutation of narrow pipeline and outlet conduit；For the pipeline outer wall that narrows equipped with a loop pipeline, the looped pipeline, the seal for pipe joints junction that narrows are connected to the gap of cyclic annular inner cavity of pipe and the inner cavity of pipe that narrows equipped with a circle；High concentration gas is sprayed into the low concentration gas in flowing by the gap, is blended.The present invention proposes a kind of method for adjusting mixing proportion according to the gas density of device output, and according to this method, the gas density that blending can be made to export is stablized 1.2% or so, prevents from exploding, and periodically can carry out accuracy correction to system.
Description
Technical field
The invention belongs to low concentration gas to utilize technical field, and in particular to a kind of safe mixing device of ultralow concentration gas
And the method using the device.
Background technique
Regenerative oxidation is a kind of processing methane concentration low (0.5% or so), enrichment hardly possible, broad-minded coalmine ventilation gas weight
Technology wanting, with development prospect.Regenerative oxidation device based on regenerative oxidation technology in actual operation, due to ventilating tile
This methane concentration too low (< 0.3%) and fluctuation is big, is unfavorable for the stable operation of oxidation unit；Simultaneously, it is contemplated that user's (mine
Area) to the demand with energy such as hot and cold, electric, the higher pumping of methane concentration must be usually blended in the extremely low ventilating gas gas of concentration
Mash gas (about 3%-5%) on the one hand guarantees that methane gas concentration maintains more stable numerical value, on the other hand guarantees methane oxygen
The heat of change release meets user with energy demand by recycling.
However, often being influenced by factors such as site area, condition and economy, after blending in realizing blending procedure
Gas to enter flow monitoring point, concentration monitor point, the duct length of the flowed through arrangement of oxidation unit limited, be difficult to realize
Even blending influences the accuracy of concentration on-line monitoring, flow measurement, causes mixed gas calorific value to be unevenly distributed, lamination, shadow
The stability of regenerative oxidation unit temp field is rung, and concentration monitor error is with security risk.
Summary of the invention
The object of the invention is that providing a kind of structurally reasonable to solve the above-mentioned problems, mixing effect is good super
Light concentration mash gas safety mixing device and its method.
The present invention is achieved through the following technical solutions above-mentioned purpose：
A kind of safe mixing device of ultralow concentration gas, including being sequentially connected, logical inlet flange, inlet duct, narrow pipe
Road, outlet conduit, outlet(discharge) flange；Wherein inlet duct and outlet conduit are the conventional pipeline that diameter is equal, the pipeline that narrows connection
Inlet duct side diameter is identical as inlet duct, and connection outlet pipeline side diameter is small, the company of narrow pipeline and outlet conduit
Connect place's pipe diameter mutation；
Equipped with a loop pipeline, the looped pipeline, the seal for pipe joints junction that narrows are set the pipeline outer wall that narrows
There is a circle to be connected to the gap of cyclic annular inner cavity of pipe and the inner cavity of pipe that narrows；
The looped pipeline inner cavity connects an automatically controlled resistance-shifting valve, and the other end of the automatically controlled resistance-shifting valve connects high concentration pipe
Road is the inlet channel of high concentration gas.
High concentration gas enters from high concentration pipeline, by automatically controlled resistance-shifting valve coutroi velocity, is distributed to change through looped pipeline
The periphery in narrow pipe road, since gap is big with respect to looped pipeline resistance, so flow velocity is essentially identical everywhere in a circle gap；And gap compared with
Carefully, so flow velocity can spray greatly to all positions in the channel that narrows.
The present apparatus further improvement lies in that, further include the fixation net set on outlet conduit inner section, the fixed net with go out
Mouthful inner wall of the pipe is connected, and further includes the cone for being mounted on fixed net center, and the cone direction of the cone is towards inlet duct；
The fixed net plays the role of further dispersion mixing gas, also plays fixed function；The cone can be generated further greatly
Range flow-disturbing promotes the mixing of gas.
The present apparatus further improvement lies in that, further include set on the opposite laser emitter and laser pick-off in outlet(discharge) flange both ends
Device；Laser Measuring methane concentration is common technology means, and the laser for generally selecting 1.65um wavelength is tested, the wavelength laser
Very high by methane adsorption rate, test data is accurate.
It further include proportional controller, the proportional controller includes processing module, digital analog converter, drive module and place
Manage the connected memory module of module；
The simulation input mouth of the output end connection analog-digital converter of the laser pickoff, the numeral output of analog-digital converter
The input port of mouth connection processing module；
The control port of the output port connection drive module of the processing module, the output port of drive module connect electricity
Control the automatically controlled terminal of resistance-shifting valve.
The method that ultralow concentration gas blends safely is carried out using device proposed by the present invention, is included the following steps：
Step 1, laser pickoff is periodically corrected, the reception data of blending gas up to standard are obtained；
Step 1.1, inlet flange connects standard testing pipeline, and outlet(discharge) flange connects a segment pipe；
Step 1.2, the gas that standard testing pipeline concentration is 1.2% opens laser emitter, processing module acquisition
The output number P of analog-digital converter, and it is stored in memory module；
Because laser emitting diode meeting light efficiency decaying, laser pickoff can be connected to the signal for being weaker than normal value, accidentally
Think that concentration has reached height, it is practical still relatively low, so needing often check and correction.Even if not proofreading, the blending result of system is still
It is so safe less than 1.2% gas.
Step 2, blending is executed；
Step 2.1, by inlet flange on outlet(discharge) flange, high concentration Pipe installing to corresponding pipeline.Its middle and high concentration
Pipeline is high concentration gas entrance, and inlet duct is low concentration gas entrance, and outlet conduit is the gas vent after blending；
Step 2.2, it blows to inlet duct, pressurizes and input high concentration gas to high concentration pipeline, control automatically controlled resistance-shifting valve
It is gradually opened from closed state, state control room is divided into T, and laser emitter is in the open state always, processing module comparison
Analog-digital converter exports number p and P relationship；
Step 2.3, p works as p gradually from P is greater than close to P>When P, controls automatically controlled resistance-shifting valve and open one grade, work as p<When P, control
Automatically controlled resistance-shifting valve reduces one grade, every time T, re-measures the value of p.As a further optimization solution of the present invention, described.
The gas for blending 3%-8% gas and 0.5%, reaches 1.2% or so safe concentration, then carry out high temperature oxygen
Change.Usual T according to system scale size, take gas from crack to laser pickoff the time required to twice.Gas blending
It needs to prevent concentration from acutely shaking, so automatically controlled resistance-shifting valve needs are adjusted with minimum adjustable accuracy.
The beneficial effects of the present invention are：
1) blending of ultralow concentration gas and high concentration gas may be implemented in device proposed by the present invention, realizes that 1.2% is left
Right gas density uniformly exports.
2) method proposed by the present invention may be implemented that the gas of output is allowed to begin according to real-time gas density regulating gas ratio
1.2% or so are kept eventually.
3) mixing device of the present apparatus with respect to six roots of sensation air inlet pipe circumferentially structure, unevenness in downstream line certain distance
Evenness can reduce by 50% or more, and mixing effect is good.
Detailed description of the invention
Fig. 1 is side profile structure chart of the invention；
Fig. 2 is outside structure diagram of the invention；
Fig. 3 is outlet(discharge) flange side structure schematic diagram of the invention；
Fig. 4 is module connection relationship diagram of the present invention；
Fig. 5 is the circuit connecting relation figure of the embodiment of the present invention.
In figure：1- inlet flange, 2- inlet duct, 3- narrow pipeline, 4- high concentration pipeline, the automatically controlled resistance-shifting valve of 5-, 6- ring
Shape pipeline, the crack 7-, 8- outlet(discharge) flange, 9- outlet conduit, 11- cone, the fixed net of 12-, 21- laser emitter, 22- laser
Receiver.
Specific embodiment
The application is described in further detail with reference to the accompanying drawing, it is necessary to it is indicated herein to be, implement in detail below
Mode is served only for that the application is further detailed, and should not be understood as the limitation to the application protection scope, the field
Technical staff can make some nonessential modifications and adaptations to the application according to above-mentioned application content.
Embodiment 1
As shown in Figure 1-3, a kind of safe mixing device of ultralow concentration gas, including being sequentially connected logical inlet flange 1, entering
Mouth pipeline 2, the pipeline 3 that narrows, outlet conduit 9, outlet(discharge) flange 8；Wherein inlet duct 2 and outlet conduit 9 are equal normal of diameter
It regulates, the pipeline 3 that narrows connection 2 side diameter of inlet duct is identical as inlet duct 2, and 9 side diameter of connection outlet pipeline is small,
The junction pipe diameter of pipeline 3 and outlet conduit 9 of narrowing is mutated；
Equipped with a loop pipeline 6, the looped pipeline 6, the pipeline 3 that narrows are tightly connected 3 outer wall of pipeline that narrows
Place is equipped with the gap 7 of circle connection 6 inner cavity of looped pipeline and 3 inner cavity of pipeline that narrows；
6 inner cavity of looped pipeline connects a high concentration pipeline 4, and the other end connection of the high concentration pipeline 4 is highly concentrated
Pipeline 4 is spent, is the inlet channel of high concentration gas.
The present apparatus further includes the fixation net 12 set on 9 inner section of outlet conduit, the fixed net 12 and 9 inner wall of outlet conduit
It is connected, further includes the cone 11 for being mounted on fixed 12 center of net, the cone direction of the cone 11 is towards inlet duct 2.
Such as Fig. 4, the present apparatus further includes the laser emitter 21 and laser pickoff 22 opposite set on 8 both ends of outlet(discharge) flange；
Further include proportional controller, the proportional controller include processing module, digital analog converter, drive module, with processing module phase
Memory module even；
The simulation input mouth of the output end connection analog-digital converter of the laser pickoff 22, the number of analog-digital converter are defeated
The input port of outlet connection reason module；
The control port of the output port connection drive module of the processing module, the output port of drive module connects high
The automatically controlled terminal of concentration pipeline 4.
Such as Fig. 5, in the present embodiment, processing module is SIEMENS PLC S7-200, its own contains memory space, is equivalent to
Processing module+memory module；Analog-digital converter is chip AD1974, and laser pickoff 22 is a photo resistance and its periphery electricity
Road composition, the output end OUT and clock end CLK of the input terminal IN1, AD1974 of the output connection AD1974 of the circuit are separately connected
Input terminal I1, I2 of S7-200.
The high concentration pipeline 4 is a resistance-shifting valve and the resistance-shifting valve steering engine for manipulating valve, and the steering engine is connected with 12V electricity
Source, PWM control terminal are connected to O1 mouthfuls of output end of S7-200, receive the PWM waveform that S7-200 is sent, and it is dynamic to complete corresponding opening and closing
Make.
The method that ultralow concentration gas blends safely is carried out using the present apparatus, is included the following steps：
Step 1, laser pickoff 22 is periodically corrected, the reception data of blending gas up to standard are obtained；
Step 1.1, inlet flange 1 connects standard testing pipeline, and outlet(discharge) flange 8 connects a segment pipe；
Step 1.2, the gas that standard testing pipeline concentration is 1.2% opens laser emitter 21, and processing module is adopted
Collect the output number P of analog-digital converter, and is stored in memory module；
Step 2, blending is executed；
Step 2.1, inlet flange 1 is installed on corresponding pipeline with outlet(discharge) flange 8, high concentration pipeline 4.It is wherein highly concentrated
Degree pipeline 4 is high concentration gas entrance, and inlet duct 2 is low concentration gas entrance, and outlet conduit 9 is that the gas after blending goes out
Mouthful；
Step 2.2, it blows to inlet duct 2, pressurizes and input high concentration gas to high concentration pipeline 4, control high concentration pipe
Road 4 is gradually opened from closed state, and state control room is divided into T, and laser emitter 21 is in the open state always, processing module
Compare analog-digital converter output number p and P relationship；Step 2.3, p works as p gradually from P is greater than close to P>When P, high concentration pipe is controlled
Road 4 opens one grade, works as p<When P, control high concentration pipeline 4 reduces one grade, every time T, re-measures the value of p.
By above step 1 and 2, precise and stable blending methane gas can be completed.
One embodiment of the present invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.
Claims (4)
1. a kind of safe mixing device of ultralow concentration gas, which is characterized in that including being sequentially connected logical inlet flange (1), entering
Mouth pipeline (2), the pipeline that narrows (3), outlet conduit (9), outlet(discharge) flange (8)；Wherein inlet duct (2) is with outlet conduit (9)
The equal conventional pipeline of diameter, the pipeline that narrows (3) connection inlet duct (2) side diameter is identical as inlet duct (2), connects out
Mouth pipeline (9) side diameter is small, and the junction pipe diameter of the pipeline that narrows (3) and outlet conduit (9) is mutated；
The pipeline that narrows (3) outer wall is equipped with a loop pipeline (6), the looped pipeline (6), the pipeline that narrows (3) sealing
Junction is equipped with the gap (7) of circle connection looped pipeline (6) inner cavity and pipeline (3) inner cavity that narrows；
Looped pipeline (6) inner cavity connects a high concentration pipeline (4), and the other end of the high concentration pipeline (4) connects high
Concentration pipeline (4) is the inlet channel of high concentration gas.
2. the safe mixing device of a kind of ultralow concentration gas according to claim 1, which is characterized in that further include being set to
The fixation net (12) of mouth pipeline (9) inner section, it further includes being mounted on that the fixed net (12) is connected with outlet conduit (9) inner wall
The cone (11) at fixed net (12) center, the cone direction of the cone (11) is towards inlet duct (2).
3. the safe mixing device of a kind of ultralow concentration gas according to claim 1, which is characterized in that further include being set to
The opposite laser emitter (21) in mouth flange (8) both ends and laser pickoff (22)；
It further include proportional controller, the proportional controller includes processing module, digital analog converter, drive module and processing mould
The connected memory module of block；
The simulation input mouth of the output end connection analog-digital converter of the laser pickoff (22), the numeral output of analog-digital converter
The input port of mouth connection processing module；
The control port of the output port connection drive module of the processing module, the output port of drive module connect high concentration
The automatically controlled terminal of pipeline (4).
4. a kind of carry out the method that ultralow concentration gas blends safely using device according to claim 3, feature exists
In including the following steps：
Step 1, laser pickoff (22) periodically are corrected, obtains the reception data of blending gas up to standard；
Step 1.1, inlet flange (1) connects standard testing pipeline, and outlet(discharge) flange (8) connects a segment pipe；
Step 1.2, the gas that standard testing pipeline concentration is 1.2% is opened laser emitter (21), processing module acquisition
The output number P of analog-digital converter, and it is stored in memory module；
Step 2, blending is executed；
Step 2.1, inlet flange (1) is installed on corresponding pipeline with outlet(discharge) flange (8), high concentration pipeline (4).It is wherein high
Concentration pipeline (4) is high concentration gas entrance, and inlet duct (2) is low concentration gas entrance, and outlet conduit (9) is after blending
Gas vent；
Step 2.2, it blows to inlet duct (2), pressurizes and input high concentration gas to high concentration pipeline (4), control high concentration pipe
Road (4) is gradually opened from closed state, and state control room is divided into T, and laser emitter (21) is in the open state always, processing
Module compares analog-digital converter output number p and P relationship；
Step 2.3, p works as p gradually from P is greater than close to P>When P, control high concentration pipeline (4) opens one grade, works as p<When P, control
High concentration pipeline (4) reduces one grade, every time T, re-measures the value of p.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810770812.2A CN108916654A (en) | 2018-07-13 | 2018-07-13 | A kind of safe mixing device of ultralow concentration gas and method |
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| CN201810770812.2A CN108916654A (en) | 2018-07-13 | 2018-07-13 | A kind of safe mixing device of ultralow concentration gas and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117432458A (en) * | 2023-11-13 | 2024-01-23 | 中国矿业大学 | Gas mixing device |
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| CN206064211U (en) * | 2016-09-13 | 2017-04-05 | 中国科学院工程热物理研究所 | A kind of coal mine gas mixing device |
| CN107435554A (en) * | 2017-07-20 | 2017-12-05 | 山西文龙中美环能科技股份有限公司 | Gas blends system and gas blending concentration control method |
| CN207122321U (en) * | 2017-03-22 | 2018-03-20 | 南京凌翔节能科技有限公司 | A kind of gas diluter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH02273525A (en) * | 1988-11-21 | 1990-11-08 | L'air Liquide | Manufacture of low concentration gas mixture and apparatus therefor |
| CN101233359A (en) * | 2005-09-29 | 2008-07-30 | 三菱重工业株式会社 | Piping with fluid mixing region |
| CN103328917A (en) * | 2010-11-03 | 2013-09-25 | 巴特勒能源同盟有限公司 | Vaporization chambers and associated methods |
| CN102562131A (en) * | 2010-12-24 | 2012-07-11 | 上海攀极投资有限公司 | Coal mine gas comprehensive application system and application method thereof |
| CN102337918A (en) * | 2011-08-23 | 2012-02-01 | 山东理工大学 | Twin-stage adjustable blade spiral-flow type dilution mixer for gas drainage |
| CN202690117U (en) * | 2012-04-01 | 2013-01-23 | 浙江亿扬能源科技有限公司 | Ventilation air collecting and mixing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117432458A (en) * | 2023-11-13 | 2024-01-23 | 中国矿业大学 | Gas mixing device |
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Application publication date: 20181130 |
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