CN109099312A - Cold drum or crude benzol workshop section emission-control equipment and the method for intelligent pressure maintaining and control oxygen - Google Patents
Cold drum or crude benzol workshop section emission-control equipment and the method for intelligent pressure maintaining and control oxygen Download PDFInfo
- Publication number
- CN109099312A CN109099312A CN201811046977.1A CN201811046977A CN109099312A CN 109099312 A CN109099312 A CN 109099312A CN 201811046977 A CN201811046977 A CN 201811046977A CN 109099312 A CN109099312 A CN 109099312A
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- Prior art keywords
- tank
- storage tank
- material storage
- control
- controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 62
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 62
- 239000001301 oxygen Substances 0.000 title claims abstract description 62
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 239000007789 gas Substances 0.000 claims abstract description 97
- 239000000463 material Substances 0.000 claims abstract description 72
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000011084 recovery Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 239000012141 concentrate Substances 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims description 2
- 230000007306 turnover Effects 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 230000000740 bleeding effect Effects 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000003034 coal gas Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010348 incorporation Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The present invention provides a kind of cold drum or crude benzol workshop section emission-control equipment and pressure maintaining control oxygen method, it includes controller, gas compressor, material storage tank, collect accumulator, process tank, pressure sensor, oxygen concentration detecting instrument, accumulator is collected to be connected to by pipeline I with material storage tank, pipeline I is provided with gas compressor and connect with controller, accumulator is collected to be stored for future use by the exhaust gas that I collection material storage tank of pipeline generates, accumulator is collected to be connected to by pipeline II with material storage tank, to return gas to material storage tank pumping or ftercompction, process tank is connected to by pipeline III with material storage tank, pipeline I, II, III is provided with valve connect with controller, material storage tank, collection accumulator is provided with pressure sensor and connect with controller, controller is according to the data intelligence control valve acquired in real time, the unlatching of gas compressor and It closes, realizes intelligent pressure maintaining and control oxygen purpose.
Description
Technical field
The present invention relates to exhaust gas treatment technology, specially cold drum or crude benzol workshop section emission-control equipment and intelligent pressure maintaining and control
The method of oxygen.
Background technique
The cold drum of chemical enterprise and crude benzol workshop section can collect exhaust gas from material pot and other bleeding points and be focused on,
Material pot itself is sealing, and when the materiel warehouse-out in material pot, tank body epicoele can generate negative pressure, and tank body is easily damaged, simultaneously
After epicoele exhaust gas is collected, material pot also can decompression lead to the problem of, at this stage for keep pressure of storage tank balance (hereinafter referred to as
Pressure maintaining) there are mainly two types of solutions:
1. nitrogen charging pressure maintaining method: there are the drawbacks of be that the coal gas nitrogen content in associated other systems is caused to increase, influence coal gas
Calorific value.
2. filling steam pressure maintaining method: there are the drawbacks of be enter steam after, steam be easy condensation generate waste water.Cause tar,
Water content increases in benzene, influences product quality, increases the improvement burden of waste water.
Meanwhile needing to control exhaust oxygen concentration value (hereinafter referred to as control oxygen) after gas sampling, it prevents at subsequent exhaust gas
When reason, oxygen concentration is excessively high to lead to combustion explosion problem, is to close to introduce when being above standard by measuring oxygen concentration at this stage
To the pipeline valve of other systems, to prevent excessive oxygen from entering other systems, avoid security risk, there are the drawbacks of be
Exhaust gas can not carry out the processing of next step after closing pipeline valve, generally take oxygen-containing exceeded exhaust gas being directly discharged to atmosphere
In, air pollution is caused, another means are to pour inert gas, for example general nitrogen charging controls oxygen content, and a large amount of nitrogen add
Enter to cause subsequent waste gas treatment process difficulty to increase.
Summary of the invention
The present invention seeks to provide a kind of cold drum or crude benzol workshop section emission-control equipment and the method for intelligent pressure maintaining and control oxygen,
The storage device that an exhaust gas up to standard is arranged collects that accumulator is counter mends material storage tank and process tank, useless by acquiring each tank in real time
Gas parameter, the valve opening and closing between each tank of intelligent control, intelligence keep the internal pressure balance and control process tank exhaust gas of storage tank
Oxygen density value, to achieve the purpose that safe and reliable improvement exhaust gas.
For achieving the above object, technological means adopted by the present invention are as follows:
A kind of cold drum or crude benzol workshop section emission-control equipment, it includes controller, gas compressor, material storage tank, collects storage pressure
Tank, process tank, pressure sensor, oxygen concentration detecting instrument, material storage tank generate volatility exhaust gas, concentrate on above material storage tank
Cavity in, collect accumulator and be connected to material storage tank by pipeline I, pipeline I is provided with gas compressor and connect with controller,
Collect accumulator stored for future use by the exhaust gas that I collection material storage tank of pipeline generates, collect accumulator pass through pipeline II and
Material storage tank connection, to return gas to material storage tank pumping pressure or ftercompction, process tank is connected to by pipeline III with material storage tank, is collected
Exhaust gas is handled, and pipeline I, II, III is provided with valve and connect with controller, and material storage tank, collection accumulator are provided with pressure
Force snesor is connect with controller, and oxygen concentration detecting instrument is connect with process tank and controller respectively, and controller acquires pressure and passes
Sensor, oxygen concentration detecting instrument data, the opening and closing of control valve, gas compressor.
The process tank is connect with other gas sampling point simultaneously, and process tank is by pipeline IV and collects accumulator company
Logical, pipeline IV is provided with valve and connect with controller.
The pressure sensor uses laser using conventional corrosion pressure sensor, the oxygen concentration detecting instrument
Gas analyzer, the specific LGA-4500 laser oxygen analyser or other similar products for using Hangzhou optically focused Science and Technology Ltd., control
Device processed selects conventional programmable controller, and acquisition module and output control module, acquisition module and pressure is at least arranged in controller
Sensor connects with oxygen concentration detecting instrument, the opening and closing of output control module output control valve door, and Siemens can be selected
S7-200 programmable controller or similar product；The gas compressor uses preserving gas compressor, selects Zi Gong three strongest ones
The V-3.33/5 type benzene vapor compressor or similar product of Cassini compressor Co., Ltd.
The collection accumulator is 1-3, in addition it is slack tank, slack tank and work that one of them, which is work tank body,
It is arranged in parallel between pipeline II and pipeline IV as tank, it is spare by valve control switching when work tank gas storage pressure deficiency
Tank body, so that there is a collection accumulator connection between pipeline II and pipeline IV always.
The controller is also connected with display screen, industrial control host, console, to show storage manipulation data, passes through band
Long-range monitoring can be realized by having the industrial control host of network savvy.
The material storage tank is generally Leng Gu workshop section tar storage tank or crude benzol workshop section material storage tank, can generate tar
Volatilization gas or stupid steam；It collects the gas componant composition in accumulator in gas and material storage tank；Process tank is because receive
Exhaust gas has other bleeding point simultaneously in collection material storage tank, therefore can generate the incorporation of oxygen-containing gas.
A kind of to carry out pressure maintaining control oxygen method using above-mentioned cold drum or crude benzol workshop section emission-control equipment, it includes pressure maintaining period
With control oxygen process:
Pressure maintaining period:
By pressure value in monitoring control devices material storage tank, the gas for collecting accumulator is utilized intelligently to adjust according to pressure size
The valve of material storage tank turnover pipeline carries out pumping or tonifying Qi to it, adjusts its internal pressure:
When the pressure value detected is higher than setting value, controller will control corresponding electrically operated valve and open or close, by material
Extra exhaust gas is discharged into output pipe or is collected into collection accumulator in storage tank, until the pressure recovery in material storage tank is to setting
Definite value；
When the pressure value detected is lower than setting value, controller will control corresponding intelligent control electrically operated valve and open or close
It closes, the exhaust gas collected in accumulator is discharged into the material storage tank, up to the pressure recovery in material storage tank to setting value.
Control oxygen process:
The numerical value of the intelligent oxygen concentration detector on process tank is mounted on by monitoring control devices, according to the size of its numerical value come
Intelligence adjusts the oxygen concentration inside collecting tank:
When detecting that concentration value is higher than setting value, controller will control corresponding intelligent control electrically operated valve and open or close,
The exhaust gas collected in accumulator is filled with process tank to be afterwards diluted oxygen concentration, after reaching setting value, process tank discharge
To output pipe to other systems, subsequent processing is carried out；Exhaust gas when detecting concentration value not higher than setting value, in collecting tank
Other systems will be directly discharged to, subsequent processing is carried out.
Further, the collection accumulator is used for for material storage tank holding pressure control and to process tank control oxygen control simultaneously
System, interior exhaust gas constituents are identical as material storage tank, and undope other foreign gas, are conducive to the quality of whole processing technology.
Further, during carrying out control oxygen, collection accumulator can be taken to return gas, object to material storage tank by pipeline II
Material storage tank carries out increase input exhausted air quantity mode to process tank by pipeline III and dilutes oxygen concentration in process tank, stores up instead of collecting
Tank is pressed directly to process tank gas transmission control oxygen, to realize process tank control oxygen purpose.
The invention has the benefit that
The present apparatus and method are that the internal pressure balance of material storage tank and control exhaust gas is intelligently kept to arrange using the exhaust gas being collected into
Oxygen density value a little is put, no increase quotes other media in the treatment process of exhaust gas.Because not occurring new other useless
Gas impurity reduces the cost of waste gas treatment equipment and the difficulty for the treatment of process, reduces the pollution treatment burden of enterprise, and is conducive to
Exhaust-gas treatment quality；By controller intelligent control, cost of labor is saved, safety in production caused by avoiding because of human factor is hidden
Suffer from, helps to create green science and technology environmental protective type chemical enterprise.
Detailed description of the invention
Fig. 1 is structure composition schematic diagram of the embodiment of the present invention.
Specific embodiment
A kind of cold drum or crude benzol workshop section emission-control equipment as shown in drawings, it include controller 5, gas compressor 2,
Material storage tank 1 collects accumulator 3, process tank 4, pressure sensor, oxygen concentration detecting instrument, and it is useless that material storage tank 1 generates volatility
Gas concentrates in the cavity of 1 top of material storage tank, collects accumulator 3 and is connected to by pipeline I with material storage tank 1, pipeline I is arranged
There is gas compressor 2 to connect with controller 5, collects accumulator 3 and stored up by the exhaust gas that I collection material storage tank 1 of pipeline generates
It deposits spare, collects accumulator 3 and be connected to material storage tank 1 by pipeline II, pressed or gas is returned in ftercompction, place to be taken out to material storage tank 1
Reason tank 4 is connected to by pipeline III with material storage tank 1, is collected exhaust gas and is handled, pipeline I, II, III is provided with valve and control
Device 5 connects, and material storage tank 1, collection accumulator 3 are provided with pressure sensor and connect with controller 5, oxygen concentration detecting instrument difference
It is connect with process tank 4 and controller 5, the data of the pressure sensor of acquisition, 4 oxygen concentration detecting instrument of process tank is transferred to control
Device 5 processed, the opening and closing of controller 5 intelligent control valve, gas compressor 2.
The process tank 4 connect with other bleeding points (pipeline for generating exhaust gas) simultaneously, process tank 4 by pipeline IV and
It collects accumulator 3 to be connected to, pipeline IV is provided with valve and connect with controller 5.
The pressure sensor uses laser using conventional corrosion pressure sensor, the oxygen concentration detecting instrument
Gas analyzer, the specific LGA-4500 laser oxygen analyser or other similar products for using Hangzhou optically focused Science and Technology Ltd., control
Device 5 processed selects conventional programmable controller, and acquisition module and output control module, acquisition module and pressure is at least arranged in controller
Sensor and oxygen concentration detecting instrument connection, output control module are provided with multiple groups relay and each valve and gas compressor connects
It connects, Siemens S 7-200 PLC or similar product can be selected；The gas compressor 2 is compressed using preserving gas
Machine selects the V-3.33/5 type benzene vapor compressor or similar product of Zi Gong three strongest ones Cassini compressor Co., Ltd.
The collection accumulator 3 is 1-3, in addition it is slack tank, slack tank and work that one of them, which is work tank body,
It is arranged in parallel between pipeline II and pipeline IV as tank, it is spare by valve control switching when work tank gas storage pressure deficiency
Tank body, so that there is a collection accumulator connection between pipeline II and pipeline IV always.
The controller 5 is also connected with display screen, industrial control host, console, to show storage manipulation data, passes through band
Long-range monitoring can be realized by having the industrial control host of network savvy.
The material storage tank 1 is generally Leng Gu workshop section tar storage tank or crude benzol workshop section material storage tank, can generate coke
Oily volatilization gas or stupid steam；It collects the gas componant composition in accumulator 3 in gas and material storage tank；Process tank 4 because
Other bleeding point is had simultaneously for exhaust gas in collection material storage tank, therefore the incorporation of oxygen-containing gas can be generated.
A kind of to carry out pressure maintaining control oxygen method using above-mentioned cold drum or crude benzol workshop section emission-control equipment, it includes pressure maintaining period
With control oxygen process:
Intelligent pressure maintaining period: when the materiel warehouse-out of material storage tank 1 because material storage tank 1 be sealing will lead in tank body under pressure
Drop forms negative pressure, and the Intellisense sensor installed on tank body at this time can stand lnp information notification controller 5, controller 5
Instruction notification 3-2 valve is opened, the corresponding gas for collecting accumulator 3 is filled in material storage tank 1, reaches its pressure
Balance；The pressure in tank can be made to increase when the materiel warehouse-in of material storage tank 1, the pressure of the upper installation of material storage tank 1 at this time passes
Pressure can be increased information notification controller 5 by sensor, and intelligence control system is judged, or start gas compressor 2 to collection
Accumulator 3 is compressed into tank or issuing instruction to 1-2 valve and 4-2 valve gas being discharged into process tank 4, realizes material storage tank
The effect of 1 intelligent pressure maintaining.
Intelligence control oxygen process: when laser gas analyzer monitors that the oxygen content of process tank 4 is more than setting value, tank body this moment
The Intellisense sensor of upper installation can by information notification controller 5, controller 5 can immediately by instruction notification 1-2,3-2,3-3,
4-2,4-3 are closed, and open valve 3-3, and the gas for collecting accumulator 3 is filled in process tank 4 and is diluted to the gas in tank,
When laser gas analyzer monitors that the oxygen content of process tank 4 reaches setting value, close valve 3-3, open it is corresponding other
Valve carries out exhaust gas up to standard to be output to negative-pressure pipeline progress subsequent processing, it is achieved that the effect of the intelligence control oxygen of process tank
Fruit.
Under normal circumstances, the processing of the dilution to exhaust gas oxygen-containing in process tank 4 can be completed by collecting accumulator 3, when containing
Oxygen exhaust gas is excessive, this kind of mode is thrown away when being unable to reach purpose, can increase inert gas piping connection in process tank, carry out at emergency
Reason.
The above is only a preferred embodiment of the present invention, which it is same to apply also for chemical field generation
Gas sampling is handled in other production processes, such as sulfur removal technology of problem, it is noted that for the common of technical field
For technical staff, without departing from the principle of the present invention, several improvement can also be made, wound is not being paid in these improvement
It also should be regarded as protection scope of the present invention under the premise of the property made labour.
Claims (7)
1. a kind of cold drum or crude benzol workshop section emission-control equipment, characterized in that it includes controller, gas compressor, material storage
Tank collects accumulator, process tank, pressure sensor, oxygen concentration detecting instrument, and material storage tank generates volatility exhaust gas, concentrates on
In cavity above material storage tank, collects accumulator and be connected to by pipeline I with material storage tank, pipeline I is provided with gas compressor
It is connect with controller, collects accumulator and stored for future use by the exhaust gas that I collection material storage tank of pipeline generates, collect accumulator
It is connected to by pipeline II with material storage tank, to return gas to material storage tank pumping pressure or ftercompction, process tank passes through pipeline III and material
Storage tank connection is collected exhaust gas and is handled, and pipeline I, II, III is provided with valve and connect with controller, and material storage tank collects storage
Pressure tank is provided with pressure sensor and connect with controller, and oxygen concentration detecting instrument is connect with process tank and controller respectively, control
Device acquires pressure sensor, oxygen concentration detecting instrument data, the opening and closing of control valve, gas compressor.
2. cold drum according to claim 1 or crude benzol workshop section emission-control equipment, characterized in that process tank simultaneously with it is other
The connection of gas sampling point, process tank are connected to by pipeline IV with accumulator is collected, and pipeline IV is provided with valve and connect with controller.
3. cold drum according to claim 1 or crude benzol workshop section emission-control equipment, characterized in that the pressure sensor
Using conventional corrosion pressure sensor, the oxygen concentration detecting instrument uses laser gas analyzer；Controller is selected normal
Programmable controller is advised, acquisition module and output control module, acquisition module and pressure sensor and oxygen is at least arranged in controller
The connection of gas concentration detector, the opening and closing of output control module output control valve door；The gas compressor is using anti-
Rotten gas compressor.
4. cold drum according to claim 1 or crude benzol workshop section emission-control equipment, characterized in that the collection accumulator
It is 1-3, in addition it is slack tank, slack tank is arranged in parallel with work tank, when work tank gas storage that one of them, which is work tank body,
When insufficient pressure, switching spare tank is controlled by valve.
5. cold drum according to claim 1 or crude benzol workshop section emission-control equipment, characterized in that the controller also connects
Display screen, industrial control host, console are connect, industrial control host is to show storage manipulation data, by the industry control for having network savvy
Host can realize long-range monitoring.
6. a kind of carry out pressure maintaining control oxygen using the claims the 1-5 any cold drum or crude benzol workshop section emission-control equipment
Method, characterized in that it includes pressure maintaining period and control oxygen process:
Pressure maintaining period:
By pressure value in monitoring control devices material storage tank, the gas for collecting accumulator is utilized intelligently to adjust according to pressure size
The valve of material storage tank turnover pipeline carries out pumping or tonifying Qi to it, adjusts its internal pressure:
When the pressure value detected is higher than setting value, controller will control corresponding electrically operated valve and open or close, by material
Extra exhaust gas is discharged into output pipe or is collected into collection accumulator in storage tank, until the pressure recovery in material storage tank is to setting
Definite value；
When the pressure value detected is lower than setting value, controller will control corresponding intelligent control electrically operated valve and open or close
It closes, the exhaust gas collected in accumulator is discharged into the material storage tank, up to the pressure recovery in material storage tank to setting value；
Control oxygen process:
The numerical value of the intelligent oxygen concentration detector on process tank is mounted on by monitoring control devices, according to the size of its numerical value come
Intelligence adjusts the oxygen concentration inside collecting tank:
When detecting that concentration value is higher than setting value, controller will control corresponding intelligent control electrically operated valve and open or close,
The exhaust gas collected in accumulator is filled with process tank to be afterwards diluted oxygen concentration, after reaching setting value, process tank discharge
To output pipe to other systems, subsequent processing is carried out；Exhaust gas when detecting concentration value not higher than setting value, in collecting tank
Other systems will be directly discharged to, subsequent processing is carried out.
7. cold drum according to claim 6 or crude benzol workshop section exhaust gas pressure maintaining control oxygen method, characterized in that the collection storage
Pressure tank is used for for material storage tank holding pressure control and to the oxygen-containing control of process tank simultaneously, and interior exhaust gas constituents are identical as material storage tank,
Undope other foreign gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811046977.1A CN109099312B (en) | 2018-09-08 | 2018-09-08 | Cold drum or crude benzene section waste gas treatment device and intelligent pressure maintaining and oxygen controlling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811046977.1A CN109099312B (en) | 2018-09-08 | 2018-09-08 | Cold drum or crude benzene section waste gas treatment device and intelligent pressure maintaining and oxygen controlling method |
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| Publication Number | Publication Date |
|---|---|
| CN109099312A true CN109099312A (en) | 2018-12-28 |
| CN109099312B CN109099312B (en) | 2024-04-19 |
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|---|---|---|---|
| CN201811046977.1A Active CN109099312B (en) | 2018-09-08 | 2018-09-08 | Cold drum or crude benzene section waste gas treatment device and intelligent pressure maintaining and oxygen controlling method |
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| CN109099312B (en) | 2024-04-19 |
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