CN110538546A - method and device suitable for mixed multi-component gas treatment - Google Patents
method and device suitable for mixed multi-component gas treatment Download PDFInfo
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- CN110538546A CN110538546A CN201810522282.XA CN201810522282A CN110538546A CN 110538546 A CN110538546 A CN 110538546A CN 201810522282 A CN201810522282 A CN 201810522282A CN 110538546 A CN110538546 A CN 110538546A
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- scrubber
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000007789 gas Substances 0.000 claims abstract description 114
- 239000007788 liquid Substances 0.000 claims abstract description 75
- 238000005406 washing Methods 0.000 claims abstract description 36
- 238000000926 separation method Methods 0.000 claims abstract description 19
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 239000002121 nanofiber Substances 0.000 claims abstract 2
- 239000012265 solid product Substances 0.000 claims abstract 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 25
- 229910000041 hydrogen chloride Inorganic materials 0.000 claims description 24
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 claims description 24
- 238000010521 absorption reaction Methods 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000001257 hydrogen Substances 0.000 claims description 11
- 229910052739 hydrogen Inorganic materials 0.000 claims description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 10
- 238000000746 purification Methods 0.000 claims description 8
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 7
- 235000019270 ammonium chloride Nutrition 0.000 claims description 7
- 238000009825 accumulation Methods 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 6
- 239000007795 chemical reaction product Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 239000007791 liquid phase Substances 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 239000012071 phase Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000011044 inertial separation Methods 0.000 claims description 2
- 238000005201 scrubbing Methods 0.000 claims 3
- 230000001133 acceleration Effects 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 6
- 239000000047 product Substances 0.000 abstract description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 22
- 239000000460 chlorine Substances 0.000 description 5
- 229910052801 chlorine Inorganic materials 0.000 description 5
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 238000011268 retreatment Methods 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000006298 dechlorination reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2045—Hydrochloric acid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/406—Ammonia
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The present invention relates to a method and apparatus suitable for mixed multi-component gas processing. The method mainly removes impurity gases in the multi-component gas, wherein the multi-component gas contains one or more impurity gases; the device comprises a multistage Venturi scrubber and a multistage gas-liquid separation unit, wherein the multistage Venturi scrubber has multiple forms of series connection, parallel connection, series-parallel connection and the like, impurity gases in the multi-component gases are absorbed by washing liquid in the process of washing by the Venturi scrubber, or the multiple impurity gases are mixed and react, and a product after reaction is absorbed by the washing liquid or is a solid product, so that the impurity gases in the mixed multi-component gases are deeply removed, the washed mixed gases sequentially pass through a gas-liquid inertia separation distributor, a high-efficiency blade gas-liquid separation module and a nanofiber mixed high-efficiency gas-liquid separation module, and the washing liquid carried in the washed mixed gases is deeply removed.
Description
Technical Field
The invention relates to the technical field of gas purification, in particular to a method and a device suitable for mixed multi-component gas treatment.
Background
in the industrial production process, a mixed gas containing a plurality of components needs to be removed from a certain impurity gas, the gas purification by adopting a wet washing mode is an economic and efficient measure, and in the actual operation process, for the gas with complex components and special properties, the wet treatment method has some defects, such as the problems of excessive use of washing liquid, difficult treatment of the washing liquid and the like.
For example, continuous reforming requires chlorine injection during the operation of the process according to the water-chlorine equilibrium in the system and chlorination after the catalyst is regenerated to maintain the chlorine content on the catalyst, wherein the lost chlorine element is mostly present in the reformed hydrogen in the form of hydrogen chloride. In recent years, chlorine corrosion accidents occur in devices using reformed hydrogen for many times, so that accidents such as blockage of a heat exchanger perforation system by NH4Cl and coking of a furnace tube and the like which cause device shutdown sometimes occur, and thus dechlorination treatment of reformed hydrogen-rich gas is required.
hydrogen chloride (HCl) gas is a colorless and strongly pungent gas, and 1 volume of water can dissolve about 400 volumes of HCl gas. Based on the principle that hydrogen chloride is easily dissolved in water, water is often adopted to directly absorb hydrogen chloride gas, but the direct absorption is easy to desorb, and the absorbed water is acidic, so that the subsequent treatment is not facilitated.
Under normal temperature and normal pressure, the solubility of ammonia in water is also very high, but the ammonia is similar to the absorption of hydrogen chloride gas, so that the multi-component gas containing hydrogen chloride and the multi-component gas containing ammonia can be treated simultaneously, the purification efficiency of the two gases is improved, and the problem of subsequent reprocessing of the washing liquid is solved.
the patent: CN 206334508U discloses a spray tower of hydrogen chloride absorption process, which adopts a two-stage spray mode to improve the hydrogen chloride absorption efficiency, and has larger equipment volume, complex structure and longer processing time; the patent: CN 205127685U discloses a hydrogen chloride tail gas purification device, which comprises a reaction kettle, wherein the device has large volume and complex structure; the patent: 104474852A discloses an ammonia gas absorption device and an absorption method thereof, which has simple structure, when the absorption efficiency reaches more than 80%, the absorption liquid has large consumption and is alkaline, and needs a retreatment process.
Therefore, there is a need to improve the prior art by using a multi-component gas treatment process that is simple in structure, efficient in treatment, and low in treatment cost.
Disclosure of Invention
To overcome the above-described deficiencies of the prior art, the present invention provides a method and apparatus for mixed multi-component gas processing.
the technical scheme adopted by the invention is that a multi-stage Venturi structure is adopted, so that impurity gases in the mixed multi-component gas are absorbed by a cleaning solution to the maximum extent, or a plurality of impurity gases are controlled to react by mixing, a reaction product is easily absorbed by the cleaning solution or the reaction product is solid, and finally the impurity gases in the mixed multi-component gas are removed; by adopting the multistage gas-liquid separation module, the mixed gas after washing can be subjected to deep liquid removal, so that the mixed gas after purification is prevented from carrying washing liquid.
In order to achieve the purpose, the invention provides a scheme suitable for mixed multi-component gas treatment, which comprises the following specific technical scheme:
A method suitable for mixed multi-component gas processing, comprising the steps of:
(1) After entering from the inlet of the primary venturi wet scrubber, the mixed multi-component gas is firstly decompressed and accelerated to 40-60 m/s, the high-speed gas atomizes the washing liquid (water) injected from the throat, and the gas-liquid contact area is increased rapidly;
(2) Then, the hydrogen chloride gas in the gas flow is quickly absorbed by the washing liquid, and the gas pressure is gradually recovered by a divergent section arranged behind the throat; with the increase of the pressure, the solubility of the hydrogen chloride gas in water is increased, and the washing liquid further absorbs the hydrogen chloride gas.
(3) After the absorption of the hydrogen chloride gas is finished, the washed low-molecular gas enters a secondary Venturi scrubber and is mixed with reformed hydrogen entering from a secondary Venturi inlet.
(4) The mixed gas is subjected to the same washing process in a two-stage Venturi convergent section, a throat section and a divergent section, and HCl in the gas and the absorption liquid reacts with NH3 in the process to generate NH4Cl crystals.
(5) The mixed gas after washing passes through the three-stage venturi to increase the retention time, realize the absorption of unreacted HCl and NH3 gas, and further improve the washing effect.
(6) Large water drops in hydrogen flow are separated through an inertia separation distributor, NH4Cl crystals generated by reaction in the washing process are separated to a liquid accumulation area of a tank body along with absorption liquid drops, small water drops carried in the gas flow are deeply separated through a combined high-efficiency blade separator and a nano mixed gas-liquid separator, a separated liquid phase is discharged to a bottom liquid accumulation area through gravity and a drainage tube, and a purified gas phase is discharged from the top.
(7) The design scheme combines gas absorption and gas-liquid efficient separation, the equipment is simple and efficient, water consumption can be reduced, the pH value of the washing liquid is basically neutral, and the retreatment difficulty of the washing liquid is reduced.
The invention has the beneficial effects that:
(1) the washing efficiency is improved and the using amount of the washing liquid is reduced by adopting a serial or parallel structure form of the multistage Venturi scrubber;
(2) when multi-component gas is treated simultaneously, the treatment capacity of each impurity gas can be controlled, so that the pH value of the washed liquid tends to be neutral, the retreatment difficulty of the washed liquid is reduced, the operation cost can be integrally reduced, and the economic benefit is further improved;
(3) The multistage high-efficiency gas-liquid separation module is adopted, the equipment volume can be reduced, high-efficiency washing and separation can be realized by combining a high-efficiency Venturi scrubber, the processing time is greatly reduced, and the processing efficiency is improved.
drawings
FIG. 1 is a schematic diagram of the configuration of the apparatus in the form of a series configuration of Venturi scrubbers according to example 1.
FIG. 2 is a schematic diagram of the configuration of the device in the form of a parallel configuration of venturi scrubbers.
the device comprises a primary venturi inlet 1, a primary venturi liquid injection nozzle 2, a primary venturi throat 3, a secondary venturi inlet 4, a secondary venturi liquid injection nozzle 5, a secondary venturi throat 6, a tertiary venturi inlet 7, a tertiary venturi liquid injection nozzle 8, a tertiary venturi throat 9, a scrubber and separator connecting flange 10, a make-up liquid inlet 11, a skirt 12, a separator liquid discharge port 13, a liquid level meter interface 14, a liquid level meter interface 15, an inertial separation distributor 16, a gas distribution disc 17, a differential pressure meter interface 18, a gas-liquid high-efficiency separation internal part 19, a flushing ring pipe 20, a differential pressure meter interface 21, a separator outlet 22 and a flushing liquid inlet 23.
Detailed Description
The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the invention by those skilled in the art based on the teachings herein are within the scope of the present invention.
example 1
After extensive and intensive research, the inventor of the application finds that the multistage venturi scrubber and the gas-liquid separator are easy to react for removing water-soluble gases such as hydrogen chloride, ammonia gas and the like or various impurity gases, and the product after the reaction is easy to dissolve in water or the product is solid multi-component gas, so that the efficiency is higher.
A certain oil refinery needs to treat reformed hydrogen and low-molecular gas to remove chloride ions and ammonia gas contained in the gas, and the specific working conditions are as follows:
| Working conditions | Low gas separation | reforming hydrogen |
| H2 | 0.9060 | 0.9425 |
| C1～C4 | 0.0797 | 0.0535 |
| IC4 | 0.0068 | 0.0025 |
| H2S | 0.0001 | 0.0000 |
| NH3 | ～500PPm | 0.0000 |
| H2O | 0.0039 | 0.0000 |
| C5+ | 0.0035 | 0.0015 |
| Cl- | ～2PPm | |
| Total flow rate kg/hr | 884 | 8333 |
| Temperature of | 45 | 40 |
| Pressure MPa | 2.4 | 2.4 |
After entering from the inlet of the first-stage Venturi wet scrubber, the low-component gas is firstly decompressed and accelerated to 50m/s, the high-speed gas atomizes the washing liquid (water) injected from the throat part, and the gas-liquid contact area is sharply increased; then ammonia gas in the gas flow is quickly absorbed by the washing liquid, and the gas pressure is gradually recovered by a divergent section arranged behind the throat; along with the increase of the pressure, the solubility of the ammonia gas in water is increased, and the ammonia gas is further absorbed by the washing liquid. After the ammonia gas is absorbed, the washed low-molecular gas enters a secondary Venturi scrubber and is mixed with reformed hydrogen entering from the inlet of the secondary Venturi scrubber. The mixed gas is subjected to the same washing process in a two-stage Venturi reducing section, a throat section and a diverging section, and NH3 in the gas and the absorption liquid reacts with HCl in the process to generate NH4Cl crystals. The mixed gas after washing passes through the three-stage venturi to increase the retention time, realize the absorption of unreacted HCl and NH3 gas, and further improve the washing effect.
FIG. 1 is a schematic diagram of the configuration of the apparatus in the form of a series configuration of Venturi scrubbers according to example 1. FIG. 2 is a schematic diagram of the configuration of the device in the form of a parallel configuration of venturi scrubbers.
Large liquid drops in hydrogen flow are separated through an inertia separation distributor, NH4Cl crystals generated by reaction in the washing process are separated into a liquid accumulation area of a tank body along with liquid drops of absorption liquid, small liquid drops carried in the gas flow are deeply separated through a combined high-efficiency blade separator and a nano mixed gas-liquid separator, a separated liquid phase is discharged to a bottom liquid accumulation area through gravity and a drainage tube, and a purified gas phase is discharged from the top.
This design combines together gas absorption, the high-efficient separation of gas-liquid, and final purification efficiency is stabilized more than 90%, and equipment is simple, high-efficient, can reduce the water consumption simultaneously.
Claims (12)
1. An apparatus suitable for mixed multi-component gas purification comprising a scrubber and a gas-liquid separator, characterized by: the scrubber includes multistage venturi scrubber, every grade venturi scrubber comprises gas inlet, convergent section, throat pipe section, divergent section, gas outlet and washing liquid inlet, nozzle, vapour and liquid separator comprises multistage gas-liquid separation module and separator casing.
2. The apparatus of claim 1, wherein the multiple venturi scrubbers are connected in series, in parallel or in series and parallel, the outlet of the first venturi scrubber is connected to the gas inlet of the second venturi scrubber in series, the outlet of the last venturi scrubber is connected to the inlet of the separator, and the outlets of the multiple venturi scrubbers are connected to the inlet of the separator after converging to the same pipeline in parallel.
3. The device of claim 1, wherein the venturi scrubber has a tapered section with a taper angle of 24-29 °, a diverging section with a diverging angle of 5-8 °, and a throat length of 0.5-2.2 times the throat diameter.
4. The apparatus of claim 1, wherein the nozzle has a spray angle of 55 to 150 ° and the distance between the forward end of the nozzle and the throat entrance is 0.1 to 1.5 times the throat diameter.
5. The apparatus of claim 1, wherein the inertial separation sparger module is mounted at an inlet of the gas-liquid separator to uniformly distribute the gas and separate larger liquid droplets or solid particles entrained in the gas.
6. The device as claimed in claim 1, wherein the gas-liquid deep separation module comprises a high-efficiency blade gas-liquid separation module and a nanofiber hybrid high-efficiency gas-liquid separation module, and is used for deeply separating droplets entrained in gas.
7. The method is suitable for purifying the mixed multi-component gas, and is characterized in that the mixed multi-component gas is firstly washed by a Venturi scrubber to remove impurity gases, and then enters a multi-stage gas-liquid separation module to remove washing liquid, so that the high-efficiency purification treatment of the mixed multi-component gas is realized; the method comprises the following specific steps:
(1) After entering from the inlet of the primary Venturi wet scrubber, the mixed multi-component gas is firstly decompressed and accelerated to 40-60 m/s, and the high-speed gas atomizes the washing liquid (water) injected from the throat part;
(2) Then, the hydrogen chloride gas in the gas flow is quickly absorbed by the washing liquid, and the gas pressure is gradually recovered by a divergent section arranged behind the throat; along with the increase of the pressure, the solubility of the hydrogen chloride gas in water is increased, and the washing liquid further absorbs the hydrogen chloride gas;
(3) After the absorption of the hydrogen chloride gas is finished, the washed low-molecular gas enters a secondary Venturi scrubber and is mixed with reformed hydrogen entering from a secondary Venturi inlet;
(4) the mixed gas is subjected to the same washing process in a two-stage Venturi reducing section, a throat section and a gradually expanding section, and HCl in the gas and absorption liquid reacts with NH3 in the process to generate NH4Cl crystals;
(5) The washed mixed gas passes through a three-stage venturi to increase the retention time and realize the absorption of the unreacted HCl and NH3 gases;
(6) Large water drops in hydrogen flow are separated through an inertia separation distributor, NH4Cl crystals generated by reaction in the washing process are separated to a liquid accumulation area of a tank body along with absorption liquid drops, small water drops carried in the gas flow are deeply separated through a combined high-efficiency blade separator and a nano mixed gas-liquid separator, a separated liquid phase is discharged to a bottom liquid accumulation area through gravity and a drainage tube, and a purified gas phase is discharged from the top.
8. The method of claim 8, wherein the mixed multi-component gas is mixed prior to the scrubber, during the scrubber, or after the scrubber.
9. The method of claim 8, wherein the multi-component gas comprises an impure gas component to be removed, wherein the impure gas component is absorbed by the scrubbing liquid or is reactive with a plurality of impure gases, and wherein the reaction product of the impure gas is readily soluble in the scrubbing liquid or is a solid product.
10. The method of claim 8, wherein the multi-component gas undergoes an acceleration followed by a deceleration process as it passes through a convergent section, a throat, and a divergent section in each stage of the venturi scrubber.
11. the method of claim 10, wherein the venturi scrubber has an inlet gas velocity of 8 to 22m/s, a throat gas velocity of 35 to 65m/s, and an outlet gas velocity of 8 to 22 m/s.
12. The method of claim 10, wherein the high velocity throat gas stream atomizes the scrubbing liquid sprayed through the nozzle, and the atomized droplets have an average size of less than 80 microns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810522282.XA CN110538546A (en) | 2018-05-28 | 2018-05-28 | method and device suitable for mixed multi-component gas treatment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810522282.XA CN110538546A (en) | 2018-05-28 | 2018-05-28 | method and device suitable for mixed multi-component gas treatment |
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| CN110538546A true CN110538546A (en) | 2019-12-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114788978A (en) * | 2022-05-07 | 2022-07-26 | 长沙有色冶金设计研究院有限公司 | Novel pressure leaching process tail gas treatment device and method |
| CN117839323A (en) * | 2022-09-30 | 2024-04-09 | 中国石油化工股份有限公司 | A multi-phase hazardous chemical leakage recovery system and recovery method |
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Cited By (3)
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|---|---|---|---|---|
| CN114788978A (en) * | 2022-05-07 | 2022-07-26 | 长沙有色冶金设计研究院有限公司 | Novel pressure leaching process tail gas treatment device and method |
| CN114788978B (en) * | 2022-05-07 | 2024-04-12 | 长沙有色冶金设计研究院有限公司 | Novel pressure leaching process tail gas treatment device and method |
| CN117839323A (en) * | 2022-09-30 | 2024-04-09 | 中国石油化工股份有限公司 | A multi-phase hazardous chemical leakage recovery system and recovery method |
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Application publication date: 20191206 |
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