CN110389602A - Method for controlling the content of specific gas in target container - Google Patents
Method for controlling the content of specific gas in target container Download PDFInfo
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- CN110389602A CN110389602A CN201810352166.8A CN201810352166A CN110389602A CN 110389602 A CN110389602 A CN 110389602A CN 201810352166 A CN201810352166 A CN 201810352166A CN 110389602 A CN110389602 A CN 110389602A
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000010790 dilution Methods 0.000 claims abstract description 61
- 239000012895 dilution Substances 0.000 claims abstract description 61
- 239000003085 diluting agent Substances 0.000 claims abstract description 32
- 239000007789 gas Substances 0.000 claims description 172
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 43
- 239000001301 oxygen Substances 0.000 claims description 43
- 229910052760 oxygen Inorganic materials 0.000 claims description 43
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 36
- 230000001105 regulatory effect Effects 0.000 claims description 18
- 230000001276 controlling effect Effects 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000011261 inert gas Substances 0.000 claims description 8
- 239000007800 oxidant agent Substances 0.000 claims description 8
- 230000001590 oxidative effect Effects 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000000376 reactant Substances 0.000 claims description 4
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 14
- 238000004880 explosion Methods 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- 239000012159 carrier gas Substances 0.000 description 9
- 239000012071 phase Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 5
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 4
- 229910001882 dioxygen Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000007865 diluting Methods 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 3
- 238000010943 off-gassing Methods 0.000 description 3
- 238000010926 purge Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- OWXJKYNZGFSVRC-NSCUHMNNSA-N (e)-1-chloroprop-1-ene Chemical compound C\C=C\Cl OWXJKYNZGFSVRC-NSCUHMNNSA-N 0.000 description 2
- LRWZZZWJMFNZIK-UHFFFAOYSA-N 2-chloro-3-methyloxirane Chemical compound CC1OC1Cl LRWZZZWJMFNZIK-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 230000004224 protection Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- -1 temperature Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 241000183024 Populus tremula Species 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006735 epoxidation reaction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001706 oxygenating effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Non-Electrical Variables (AREA)
Abstract
The present invention provides a kind of methods for controlling the content of specific gas in target container, comprising the following steps: step 1: being detected by content of the detector to the specific gas in the target container；Step 2: when the detected value of the detector reaches first predetermined value, starting the first dilution gas pipeline is to convey diluent gas into the target container；Step 3: when the detected value of the detector reaches second predetermined value, starting the second dilution gas pipeline is to convey diluent gas into the target container；Wherein, the first predetermined value is less than the second predetermined value, and the flow of the first dilution gas pipeline is less than the flow of the second dilution gas pipeline.
Description
Technical field
The present invention relates to the protections that gas content fluctuates biggish equipment, more particularly to one kind for controlling target container
The method of the content of interior specific gas.
Background technique
Petrochemical enterprise in process of production, can generate various fuel gas, flammable liquid or combustion-supporting gas.Combustible gas and
Flammable liquid is also normally used as raw material and largely uses.For combustible gas, there are an explosion limits, when under explosion
It will not fire in limited time, it is ensured that safe handling.And for the three-element mixed gas body system of " fuel-oxygen-inert gas ", exist
The limiting value of one oxygen content, as long as the oxygen content in system is lower than the limiting value, no matter how remaining two kinds of constituent content becomes
Change, will not all enter and fire within region, which is referred to as the maximum allowable oxygen content of system.If various Control of gas content
Improper, combustible gas, combustible vapor can set off an explosion, this will cause serious destruction to building, the equipment etc. of surrounding, while can also
Cause personal injury.Occurs gas phase explosion in order to prevent, usually by the control of flammable Gas content under explosion limit or by oxygen content
Control is kept away under the maximum allowable oxygen content, that is, through the content of the content or oxygen that are passed through carrier gas control combustible gas
Exempt to fire.
For some equipment or technique, the content of specific gas, combustible gas are generally controlled by being passed through diluent gas
Or oxygen content fluctuation it is smaller when, diluent gas intake variation it is also smaller, usually only need a diluent gas pipe
Simultaneously installation and adjustment valve can be met the requirements line.For example, Storage Tanks Combustible Liquid, for guarantee safety need to by be passed through inert gas come
The content of oxygen in storage tank is controlled, inert gas intake is almost fixed, slightly fluctuated, and an inert gas is installed above storage tank
Pipeline and installation and adjustment valve.
However, many techniques, device are influenced oxygen content by process conditions, external environment or raw material or can at present
Gas content changes greatly, and more particularly to the equipment of reaction, bad just have is controlled under special operation condition and fires risk.Especially
Using the technique of liquid oxidizer, oxidant itself can decompose release oxygen, and controllability is relatively poor, and it is hidden to there is very big safety
Suffer from.For example, green epoxychloropropane technique, this technique is to prepare epoxychloropropane using hydrogen peroxide direct oxidation chloropropene.It is double
Enter reactor after oxygen water and chloropropene mixing, product enters knockout drum after reaction.It, can since hydrogen peroxide itself easily decomposes
Oxygen is generated, so remaining hydrogen peroxide can decompose generation oxygen on a small quantity in reactor and knockout drum in reactants and products
Gas, and explosive mixture is formed with the combustible gas of knockout drum upper space.However, hydrogen peroxide itself is decomposed by a variety of
The influence of factor, there are uncertainties.During normal production, hydrogen peroxide itself decomposition rate generally changes less, inert gas tube
Linear flow rate can slightly be adjusted according to the fluctuation of oxygen content in knockout drum.But under unusual service condition, hydrogen peroxide itself is acute
Strong decomposition can generate a large amount of oxygen, and regulating effect is little at this time.This is primarily due to dioxygen water unstable, by alkali, temperature, metal
The factors such as ion are affected.Under unusual service condition, hydrogen peroxide largely decomposes and generates a large amount of oxygen, common inert flue
Line can not meet the purging requirement of technique, can not adjust the oxygen content in knockout drum rapidly, so that gas phase oxygen content
Control lag fires risk there are huge.
In addition, the high flow capacity under special operation condition requires the moment that carrier gas flow control is swift in response, flow is high, required
Diluting gas flow is far beyond maximum process.However, select a large amount of range controllers then inadequate for daily control precision,
Cause the waste of diluent gas.
Summary of the invention
For at least some technical problems as described above, the present invention is intended to provide a kind of special in target container for controlling
Determine the method for the content of gas.This method is by being arranged different dilution tracheae and control valve to the specific gas in target container
Content controlled, this method can timely respond to and rapidly change dilution gas pipeline in diluent gas flow, thus
The content for reducing rapidly the specific gas in target container, substantially reduces risk of explosion, ensure that production safety.
For this purpose, according to the present invention, a kind of method for controlling the content of specific gas in target container is provided, including
Following steps:
Step 1: it is detected by content of the detector to the specific gas in the target container；
Step 2: when the detected value of the detector reaches first predetermined value, the first dilution gas pipeline of starting is with to institute
It states and conveys diluent gas in target container；
Step 3: when the detected value of the detector reaches second predetermined value, the second dilution gas pipeline of starting is with to institute
It states and conveys diluent gas in target container；
Wherein, the first predetermined value is less than the second predetermined value, and the flow of the first dilution gas pipeline is less than
The flow of the second dilution gas pipeline.
In a preferred embodiment, the first predetermined value is set as the 40-60% of margin of safety.
In a preferred embodiment, the second predetermined value is set as the 70-95% of margin of safety.
In a preferred embodiment, the adjusting being connected with the detector is equipped in the first dilution gas pipeline
Valve, the regulating valve are mass flowmenter.
In a preferred embodiment, the mass flowmenter is set as starting after detected value reaches first predetermined value
And it is closed after detected value is lower than first predetermined value, and aperture when mass flowmenter starting is 20-50%.
In a preferred embodiment, the control being connected with the detector is equipped in the second dilution gas pipeline
Valve, the control valve are quck-opening valve.
In a preferred embodiment, the quck-opening valve be set as starting after detected value reaches second predetermined value and
Detected value is closed after being lower than first predetermined value, and the starting time of the quck-opening valve is set below 0.1 second.
In a preferred embodiment, the diluent gas in the first, second dilution gas pipeline is identical and described dilute
Outgassing body is inert gas or alkanes gas.
In a preferred embodiment, the target container is knockout drum, the substance in the knockout drum
For the reactant of raw material and the hydrogen peroxide as oxidant, the specific gas is oxygen, and the diluent gas is nitrogen.
In a preferred embodiment, the oxygen content in the knockout drum is controlled the 50% of margin of safety
Below.
Detailed description of the invention
The present invention will be described below with reference to accompanying drawings.
Fig. 1 shows according to the present invention for controlling the device in target container in the method for the content of specific gas
Structure diagram.
In this application, all attached drawings are schematical attached drawing, are merely to illustrate the principle of the present invention, and not by real
Border ratio is drawn.
Specific embodiment
The present invention is introduced below by attached drawing.
A kind of method for controlling the content of specific gas in target container 20 is provided according to the present invention, and this method is logical
The device 100 using a kind of for controlling the content of specific gas in target container 20 is crossed to be controlled.Fig. 1 shows device
100 structure diagram.As shown in Figure 1, device 100 includes preposition equipment 10, preposition equipment 10 passes through pipeline and target container 20
Connection.Raw materials for production react in preposition equipment 10 with corresponding oxidant, are tentatively produced.It is reacted in preposition equipment 10
Product enter target container 20.Target container 20 is for the gas phase and liquid phase in separation product.In one embodiment, preposition
Equipment is reactor, and target container is knockout drum.
In the present embodiment, target container 20 is connected with gas discharge pipe line 80 and liquid discharge tube line 90.Gas discharge
Pipeline 80 is connected to the upper end of target container 20 for being discharged the gas isolated in target container 20, and liquid discharge tube line 90
The lower end of target container 20 is connected to for the liquid that target container 20 is isolated to be discharged.
In the present embodiment, target container 20 is made of special material, so that target container 20 be made to have good storage
Performance and sealing performance.Target container 20 is in gas-liquid separation during, due to the variation of some process conditions or material
Unstability, under special circumstances some specific compositions in target container 20 content change, this will lead to these it is specific at
The content divided is more than safe limit value, to cause explosion, there are serious security risks.Therefore, strict control target to hold
The content of each component in device 20 can more especially cause the content of the specific gas of explosion.
According to the present invention, target container 20 is connected with pipeline.As shown in Figure 1, pipeline includes the first dilution gas pipeline 30.Just
In normal situation, the flow of the diluent gas in the first dilution gas pipeline 30 is relatively stable, and flow is relatively low.In the present embodiment
In, regulating valve 40 is equipped in the first dilution gas pipeline 30.Regulating valve 40 is used to adjust the diluent gas in the first dilution tracheae
Flow be effectively reduced to dilute the content of the specific gas in knockout drum 20 and fire risk, improve production equipment
Security performance.
In the present embodiment, the regulating valve 40 in the first dilution gas pipeline 30 is set as mass flowmenter.Mass flowmenter is set
Aperture when being set to and start after detected value reaches predetermined value, and starting is set as 20-50% to meet stream under normal circumstances
Amount requires.Under normal circumstances, mass flowmenter can automatically adjust its aperture to control the flow in the first dilution gas pipeline 30
To be diluted.Mass flowmenter sets initiation value according to demand.Under normal conditions, when the specific gas in target container 20
Content reach mass flowmenter after setting value and just automatically adjust aperture and change the first dilution gas pipeline flow, to target container 20
It is middle to convey diluent gas to reduce the content of specific gas in target container 20.Mass flowmenter has effectively achieved control target
The content of specific gas in container 20.
In order to cope with the high flow capacity requirement under special operation condition, pipeline further includes the second carrier gas being connected with target container 20
Pipeline 60.As shown in Figure 1, being equipped with control valve 70 in the second dilution gas pipeline 60.Second dilution gas pipeline 60 can satisfy wink
Between the high requirement of diluting gas flow, and guarantee to react rapidly and control the flow of carrier gas.
In the present embodiment, second dilutes the pipe diameter size of gas pipeline 60 according in the type of carrier gas, preposition equipment 10
Reactant reaction rule and the factors such as process conditions determine.By calculating, determine that the caliber of the second dilution gas pipeline 60 is big
It is small, the content of specific gas substantially effectively can be rapidly controlled, the security performance of production equipment is further increased.
In a preferred embodiment, the control valve 70 being connected in the second dilution gas pipeline 60 is set as quck-opening valve.
Under special operation condition, quck-opening valve sets initiation value according to demand, sets when the specific gas content in gas-liquid separator tank 20 reaches
After definite value, quck-opening valve just starts rapidly, conveys diluent gas to high flow capacity quickly to reduce target container into target container 20
The content of specific gas in 20, and after the content of the specific gas in target container 20 is lower than setting value, quck-opening valve is then rapid
It closes.In a preferred embodiment, the starting time of quck-opening valve is set below 0.1 second, can fast reaction, fastly
Speed starting, to reduce specific gas diluted lag time.Quck-opening valve ensure that device 100 can control rapidly specific gas
Content, reduce gas fires risk, reduces the generation of explosion accident.
According to the present invention, device 100 further includes the detector for detecting the content of the specific gas in target container 20
50.As shown in Figure 1, detector 50 is connected with regulating valve 40 and control valve 70 respectively.Detector 50 is for detecting gas-liquid separator
The content of specific gas in tank 20.Under different situations or technique, specific gas content controlling value is different.Detector 50 can
The content of the specific gas in gas-liquid separator tank 20 is timely and accurately measured and monitored, and will test parameter and be timely transmitted to connect
Connect the regulating valve 40 on the first dilution gas pipeline 30, and the control valve 70 being connected on the second dilution gas pipeline 60.So that
Regulating valve 40 and control valve 70 are enable to respond quickly, and the flow of diluent gas are controlled in time, to efficiently control gas-liquid separation
The content of specific gas in device tank 20 is in safe range.
According to the present invention, the control valve 70 in the regulating valve 40 and the second dilution gas pipeline 60 in the first dilution gas pipeline 30
It is all provided with to be set to and start after the detected value of detector 50 reaches corresponding predetermined value.Regulating valve 40 is set as reaching in detected value
Start when one predetermined value, control valve 70 is set as the starting when detected value reaches second predetermined value, wherein first predetermined value is less than
Second predetermined value.In one embodiment, first predetermined value is preferably arranged to the i.e. the maximum allowable oxygen content of margin of safety
40%-60%, second predetermined value are preferably arranged to the 70%-95% of the maximum allowable oxygen content.In this way, under normal conditions, mesh
The specific gas changes of contents marked in container 20 is little, can slightly be adjusted by the regulating valve 40 in the first dilution gas pipeline 30
Section.Under special operation condition, the specific gas in target container 20 is unstable, and changes of contents is larger, at this point, passing through the second dilution
Control valve 70 in gas pipeline 60 can quickly and effectively control the content of the specific gas in target container 20.
According to the present invention, under normal circumstances, the mass flowmenter aperture in the first dilution gas pipeline 30 is in 20-50%'s
Normally open keeps normal purging dilution, and the quck-opening valve in the second dilution gas pipeline 60 is in normally off.Special tight
In anxious situation, full-gear can be opened rapidly and be kept to the quck-opening valve in the second dilution gas pipeline 60, realize that big flow is quickly dilute
It releases quickly to reduce the content of the specific gas in target container 20.Hereby it is achieved that the specific gas in target container 20
Content carry out classification dilution, to improve to the content of the specific gas in target container 20 control precision and dilution effect
Rate.
The workflow of the method for the content of specific gas in control target container 20 is discussed in detail below according to Fig. 1.In
In this method, firstly, being detected by content of the detector 50 to the specific gas in target container 20.Device designs equipment
The application scenario considered when type selecting is in the normally open of 20-50% for the mass flowmenter aperture in the first dilution gas pipeline 30
Normal purging dilution is kept, and the quck-opening valve in the second dilution gas pipeline 60 is in normally off.In the detection of detector 50
When value reaches first predetermined value, the mass flowmenter in the first dilution gas pipeline 30, which starts and automatically adjusts, changes the first carrier gas
The flow of pipeline 30 is diluted the specific gas in target container 20.In the case of emergency risks, in detector 50
Detected value when reaching second predetermined value, the quck-opening valve in the second dilution gas pipeline 60 starts rapidly with defeated into target container 20
The diluent gas of big flow is sent to dilute the specific gas content in target container 20 rapidly.This method is dilute by changing first automatically
The aperture of mass flowmenter in outgassing pipeline 30 is to carry out dilution under normal circumstances to the specific gas in target container 20.
And when the detected value of detector 50 reaches second predetermined value, automatic the second dilution of starting gas pipeline 60 is in target container 20
Specific gas carries out rapid dilution in special circumstances.
Method according to the present invention for controlling the content of specific gas in target container 20 is adjusted under normal conditions
It saves valve 40 and flow adjusting is carried out according to detection numerical value comparison controlling value, to guarantee specific gas content lower than controlling value.Detection
The parameter that instrument 50 will test quickly is sent to the regulating valve 40 in the first dilution gas pipeline 30.Regulating valve 40 is then according to detector
The content of specific gas in target container 20 detected by 50, adjust automatically regulating valve 40 control the flow of diluent gas,
Quickly to reduce the content of the specific gas in target container 20, its content is controlled in safe range.
And under special operation condition, it is desirable that the flow of carrier gas is very high, required moment diluting gas flow far beyond
Maximum process.The parameter fast speed that detector 50 will test is sent to the control valve 70 in the second dilution gas pipeline 30.Control
The content of the valve 70 processed then specific gas in the target container 20 according to detected by detector 50, quick response simultaneously automatically adjust
Control valve 70 controls the flow of diluent gas, quickly reduces the content of the specific gas in target container 20, controls its content and exist
In safe range.Control valve 70 can effectively prevent the content of specific gas reach the limit values caused by explosion, reduce quick-fried
The generation of fried accident.Meanwhile second dilution gas pipeline 60 and control valve 70 can respond rapidly to.Meeting the needs of high flow capacity
Under, it is enable to respond quickly and is controlled the content of specific gas, avoids and selects a large amount of range controllers, hence for daily control essence
Not caused enough the diluent gas waste of accuracy.
According to the present invention, the diluent gas in the first dilution gas pipeline 30 and the second dilution gas pipeline 60 is using identical dilute
Outgassing body, it is of course also possible to use different diluent gas.In the present invention, for controlling the carrier gas of specific gas content
Body is inert gas or alkanes gas etc..For example, diluent gas can be nitrogen, carbon monoxide, carbon dioxide, argon gas, helium
Gas, small molecule alkanes etc..
Below to use hydrogen peroxide according to the present invention for controlling mesh as sketching for the epoxidation plants of oxidant
Mark the course of work of the method for the content of specific gas in container.As shown in Figure 1, preposition equipment 10 is as the reaction in the technique
Device, target container 20 are knockout drum.In the art, the specific gas of required control content is oxygen.Arrow in Fig. 1
Indicated direction is the flow direction of unstrpped gas or liquid and diluent gas.Raw material is with the hydrogen peroxide as oxidant anti-
It answers in device and reacts, the product after reaction enters in knockout drum.Since hydrogen peroxide itself decomposition is affected by many factors, itself
It is unstable, it is easy to selfdecomposition and generate oxygen, when especially being reacted with organic matter, the organic matter of gas-phase space and dioxygen moisture
The oxygen mix of solution release, which has, fires risk.Therefore in the production technology using hydrogen peroxide as oxidant, slow down hydrogen peroxide
Selfdecomposition and control gas-phase space oxygen content be particularly important.The maximum allowable oxygen content test has been carried out using Detonation Tube,
Measure that guarantee not occur highest oxygen content that gas phase fires in knockout drum be 4%, by experiment to guarantee process safety, dress
Setting oxygen content in operation requires control 2% hereinafter, and using nitrogen as diluent gas.It is carried out according to prior art scale
Process simulation and calculation, the nitrogen flow in device stable operation on pipeline 30 are 40Nm3/ h or so, at this point, can guarantee gas-liquid
Oxygen content is below 2% in knockout drum.Under normal conditions, the selfdecomposition speed of hydrogen peroxide generally changes less.According to oxygen
The oxygen content fluctuation that content detection instrument 50 detects, the first carrier gas flow diluted in gas pipeline 30 can be by regulating valve 40 slightly
There is adjusting.The oxygen content in knockout drum is detected and controlled to the moment as a result, reduces firing for the mixture in knockout drum
Risk.
And under special operation condition, for example, reactor cooling failure causes to be mixed into metal in temperature control or other raw materials
Ion etc. accelerates so as to cause decomposing hydrogen dioxide solution so that oxygen content sharply increases.Gas-liquid under different dioxygen instant water decomposition amounts
Oxygen content in knockout drum can be found in table 1.According to decomposing hydrogen dioxide solution rule and process conditions, the simulation estimate maximum of hydrogen peroxide
Moment resolution ratio, and setting for the caliber of the second dilution gas pipeline 60 is obtained according to the maximum instantaneous Growth Rate Calculation of hydrogen peroxide content
Evaluation.It should be 25mm using the caliber that the second dilution gas pipeline 60 is calculated in ASPEN simulation.And gas pipeline 60 is diluted by second
In control valve 70 be set as quck-opening valve, the initiation value of quck-opening valve is set as 3%.It is detected as a result, when oxygen content detector 50
When numerical value reaches 3%, quck-opening valve starts rapidly, and into target container 20, high flow capacity inputs nitrogen to reduce rapidly oxygen content, keeps away
Exempt to generate gas phase explosion because of oxygen content over-limit condition.And when the numerical value that oxygen content detector 50 detects is lower than 2%, fastly
Valve opening is then closed rapidly.As a result, in process of production, by the second dilution gas pipeline 60 and quck-opening valve effectively by target container
Control for Oxygen Content in 20 hereinafter, effectively prevent generating gas phase explosion because of oxygen content over-limit condition, improves life 2%
The security performance of production.
Oxygen content in knockout drum under the different dioxygen instant water decomposition amounts of table 1
The method of control gas content according to the present invention, can be detected constantly in target container 20 by detector 50
Specific gas content.Detector 50 can pass in time information rapidly when specific gas content increases suddenly
The regulating valve 40 and control valve 70 in pipeline are diluted, to rapidly change the flow of diluent gas in dilution pipeline, is reduced rapidly
The content of specific gas in target container 20 reduces risk of explosion.In addition, the second dilution gas pipeline 60 is meeting high flow capacity
Under it is required that, the content of specific gas can be quickly controlled, avoids and selects a large amount of range controllers, is reduced for daily control essence
The waste of not caused enough the diluent gas of accuracy, has saved production cost.Meanwhile 100 structure of device is simple, manufacturing cost
It is low.
Finally it should be noted that the foregoing is merely the preferred embodiments of the invention, do not constitute to the present invention
Any restrictions.Although referring to foregoing embodiments, invention is explained in detail, for the technology of this field
It for personnel, can still modify to technical solution documented by previous embodiment, or to part of technical characteristic
It is equivalently replaced.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should all wrap
Containing within protection scope of the present invention.
Claims (10)
1. a kind of method for controlling the content of specific gas in target container, comprising the following steps:
Step 1: the content of the specific gas in the target container is detected by detector (50)；
Step 2: when the detected value of the detector reaches first predetermined value, the first dilution gas pipeline (30) of starting is with to institute
It states and conveys diluent gas in target container；
Step 3: when the detected value of the detector reaches second predetermined value, the second dilution gas pipeline (60) of starting is with to institute
It states and conveys diluent gas in target container；
Wherein, the first predetermined value is less than the second predetermined value, and the flow of the first dilution gas pipeline is less than described
The flow of second dilution gas pipeline.
2. the method according to claim 1, wherein the first predetermined value is set as the 40- of margin of safety
60%.
3. the method according to claim 1, wherein the second predetermined value is set as the 70- of margin of safety
95%.
4. the method according to claim 1, wherein being equipped with and the detection in the first dilution gas pipeline
The connected regulating valve (40) of instrument, the regulating valve are mass flowmenter.
5. according to the method described in claim 4, it is characterized in that, the mass flowmenter is set as reaching first in detected value
Start after predetermined value and closed after detected value is lower than first predetermined value, and aperture when mass flowmenter starting is 20-
50%.
6. the method according to claim 1, wherein being equipped with and the detection in the second dilution gas pipeline
The connected control valve (70) of instrument, the control valve are quck-opening valve.
7. according to the method described in claim 6, it is characterized in that, the quck-opening valve is set as reaching second in detected value predetermined
Start after value and closed after detected value is lower than first predetermined value, and the starting time of the quck-opening valve is set below 0.1 second.
8. according to claim 1 to method described in any one of 7, which is characterized in that in the first, second dilution gas pipeline
Diluent gas it is identical, and the diluent gas be inert gas or alkanes gas.
9. according to claim 1 to method described in any one of 8, which is characterized in that the target container is knockout drum,
Substance in the knockout drum is the reactant of raw material with the hydrogen peroxide as oxidant, and the specific gas is oxygen,
The diluent gas is nitrogen.
10. according to the method described in claim 9, it is characterized in that, the oxygen content control in the knockout drum is being pacified
50% or less full critical value.
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