CN113415788A - Sulfur recovery process by using fuel gas for blending combustion - Google Patents
Sulfur recovery process by using fuel gas for blending combustion Download PDFInfo
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- CN113415788A CN113415788A CN202110768546.1A CN202110768546A CN113415788A CN 113415788 A CN113415788 A CN 113415788A CN 202110768546 A CN202110768546 A CN 202110768546A CN 113415788 A CN113415788 A CN 113415788A
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- regulating valve
- flow regulating
- fuel gas
- sulfur recovery
- preheater
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000011593 sulfur Substances 0.000 title claims abstract description 49
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 49
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 48
- 239000002737 fuel gas Substances 0.000 title claims abstract description 45
- 238000011084 recovery Methods 0.000 title claims abstract description 36
- 238000002156 mixing Methods 0.000 title claims description 7
- 230000001105 regulatory effect Effects 0.000 claims abstract description 49
- 239000007789 gas Substances 0.000 claims abstract description 44
- 238000006243 chemical reaction Methods 0.000 claims abstract description 42
- 239000002253 acid Substances 0.000 claims abstract description 28
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 22
- 239000001301 oxygen Substances 0.000 claims abstract description 22
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 238000010517 secondary reaction Methods 0.000 claims abstract description 8
- 230000003197 catalytic effect Effects 0.000 claims description 26
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 claims description 8
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 3
- 238000006555 catalytic reaction Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- 229910001882 dioxygen Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims description 3
- -1 alcohol ethers Chemical class 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/02—Preparation of sulfur; Purification
- C01B17/04—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides
- C01B17/0404—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides by processes comprising a dry catalytic conversion of hydrogen sulfide-containing gases, e.g. the Claus process
- C01B17/0413—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides by processes comprising a dry catalytic conversion of hydrogen sulfide-containing gases, e.g. the Claus process characterised by the combustion step
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/02—Preparation of sulfur; Purification
- C01B17/04—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides
- C01B17/0404—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides by processes comprising a dry catalytic conversion of hydrogen sulfide-containing gases, e.g. the Claus process
- C01B17/0426—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides by processes comprising a dry catalytic conversion of hydrogen sulfide-containing gases, e.g. the Claus process characterised by the catalytic conversion
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/02—Preparation of sulfur; Purification
- C01B17/04—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides
- C01B17/0404—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides by processes comprising a dry catalytic conversion of hydrogen sulfide-containing gases, e.g. the Claus process
- C01B17/0452—Process control; Start-up or cooling-down procedures of the Claus process
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Automation & Control Theory (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a sulfur recovery process by using fuel gas for co-combustion, which is implemented by a sulfur recovery device, wherein the sulfur recovery device comprises an oxygen flow regulating valve, a fuel gas flow regulating valve, a nitrogen flow regulating valve, a main combustion chamber, an acid gas flow regulating valve, a main combustion chamber hearth, a primary reaction preheater, a secondary reaction preheater and a tertiary reaction preheater. The sulfur recovery process provided by the invention can still ensure that the main combustion chamber of the super Claus sulfur recovery does not flameout, the device does not stop, the sulfur recovery rate of the sulfur recovery device is not affected under the condition of low concentration of the acid gas, 99.1% of sulfur element in the acid gas can be recovered, and the content of SO2 in the sulfur recovery tail gas can be ensured to be discharged after reaching the standard.
Description
Technical Field
The invention relates to the technical field of sulfur recovery, in particular to a sulfur recovery process using fuel gas co-combustion.
Background
Nowadays, the country and the society pay high attention to environmental protection, the country greatly improves the emission index requirements of the tail gas of chemical enterprises, and under the background, SO2 and H2S in the tail gas react to recover S elements, and the generated H2O and CO2 reach the emission standards, SO that the economic benefit is created in sulfur production, the sulfur content in the tail gas is reduced, and the two purposes are achieved. At present, the sulfur recovery method mainly comprises wet method and dry method desulfurization, wherein the super Claus process is the improvement of the traditional Claus process, and is widely applied due to the characteristics of less influence of excessive oxygen on reaction selectivity, continuous process, high sulfur recovery rate, low investment cost and the like. The main reaction mechanism of the current super Claus process is H2S + O2 → SO2+ H2O; H2S + SO2 → S + H2O. The specific operation mode is that fuel gas and air are firstly used for combustion in a main combustion chamber, after the temperature of the combustion chamber is raised to 1000 ℃, acid gas containing H2S is introduced and mixed with oxygen (air) in a certain proportion for combustion. And (3) feeding the unreacted H2S and the generated SO2 into a subsequent four-stage Claus catalytic reactor to generate sulfur and water, SO that the tail gas reaches the emission standard.
However, after the temperature of the main combustion chamber of the sulfur recovery device rises to 1000 ℃, the process device leads the acid gas containing H2S to be burnt with O2, and the concentration of the acid gas is required to be more than or equal to 40 percent so as to maintain the temperature of a hearth by using reaction heat generated by the reaction and ensure the continuous reaction. For production enterprises, production devices using natural gas and petroleum as raw materials have extremely low sulfur content of raw materials, while production devices using coal as raw materials have low sulfur content of high-quality coal in partial production places, and the concentration of generated acid gas cannot reach 40%, so that the gas amount participating in the reaction is reduced, and the generated reaction heat is not enough to maintain the combustion reaction to be carried out at the designed temperature, thereby causing flameout of a main combustion chamber.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a sulfur recovery process using fuel gas co-combustion.
The invention provides a sulfur recovery process by blending combustion of fuel gas, which is implemented by a sulfur recovery device, wherein the sulfur recovery device comprises an oxygen flow regulating valve, a fuel gas flow regulating valve, a nitrogen flow regulating valve, a main combustion chamber, an acid gas flow regulating valve, a main combustion chamber hearth, a primary reaction preheater, a secondary reaction preheater, a tertiary reaction preheater, a quaternary reaction preheater, a sulfur cooler, four Claus catalytic reactors, an incinerator and a tail gas chimney, the air inlet end of the main combustion chamber is sequentially connected with the oxygen flow regulating valve, the fuel gas flow regulating valve, the nitrogen flow regulating valve and the acid gas flow regulating valve, the primary reaction preheater, the secondary reaction preheater, the tertiary reaction preheater and the quaternary reaction preheater are respectively connected with the upper air inlets of the four Claus catalytic reactors, and the four Claus catalytic reactors are sequentially communicated, the air outlet ends of the first three Claus catalytic reactors are connected with the air inlet end of the sulfur cooler, the fourth Claus catalytic reactor is connected with the incinerator, and the incinerator is connected with the tail gas chimney;
the sulfur recovery process using fuel gas blending combustion comprises the following steps:
s1: performing ignition pretreatment, connecting and debugging each device, introducing nitrogen to purge each device before use, and ensuring that no residual impurities exist in the device before ignition;
s2: igniting and preheating, namely opening an oxygen flow regulating valve and a fuel gas flow regulating valve to ensure that the fuel gas flow and the oxygen flow are minimum flows capable of maintaining combustion, and igniting in a hearth of a main combustion chamber of the main combustion chamber;
s3: catalytic preheating, namely introducing medium-pressure steam to preheat and heat a primary reaction preheater, a secondary reaction preheater, a tertiary reaction preheater, a quaternary reaction preheater and four Claus catalytic reactors, and after the catalytic reactors are heated to the design temperature, ensuring that the fuel gas is fully combusted by adjusting the flow of an oxygen flow regulating valve and a fuel gas flow regulating valve;
s4: and (3) carrying out catalytic reaction, opening an acid gas flow regulating valve to introduce acid gas and gradually increasing the acid gas to a maximum value, and controlling the proportion of oxygen and the acid gas to be 0.13 all the time by regulating the opening degree of an oxygen gas flow regulating valve: 1, gradually reducing the flow of the fuel gas after the combustion is stable but not completely withdrawing, and adjusting the flow of the fuel gas to control the temperature of the combustion chamber to be 950-1050 ℃.
Preferably, the fuel gas components mainly comprise H2 and CO, and the content of organic alcohol ethers such as methanol, ethanol, dimethyl ether and dimethyl ether in the fuel gas is not higher than 1%.
The invention has the beneficial effects that:
the sulfur recovery process provided by the invention can still ensure that the main combustion chamber of the super Claus sulfur recovery does not flameout, the device does not stop, the sulfur recovery rate of the sulfur recovery device is not affected under the condition of low concentration of the acid gas, 99.1% of sulfur element in the acid gas can be recovered, and the content of SO2 in the sulfur recovery tail gas can be ensured to be discharged after reaching the standard.
Drawings
FIG. 1 is a schematic structural diagram of a sulfur recovery process using fuel gas blending according to the present invention.
In the figure: 1 oxygen flow control valve, 2 fuel gas flow control valve, 3 nitrogen flow control valve, 4 main combustion chamber, 5 acid gas flow control valve, 6 main combustion chamber furnace, 7 first-order reaction preheater, 8 second-order reaction preheater, 9 third-order reaction preheater, 10 fourth-order reaction preheater, 11 sulphur cooler, 12 claus catalytic reactor, 13 incinerator, 14 tail gas chimney.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1, referring to fig. 1, a sulfur recovery process using co-combustion of fuel gas, the sulfur recovery process being implemented by a sulfur recovery device, the sulfur recovery device including an oxygen flow regulating valve 1, a fuel gas flow regulating valve 2, a nitrogen flow regulating valve 3, a main combustion chamber 4, an acid gas flow regulating valve 5, a main combustion chamber furnace 6, a primary reaction preheater 7, a secondary reaction preheater 8, a tertiary reaction preheater 9, a quaternary reaction preheater 10, a sulfur cooler 11, four claus catalytic reactors 12, an incinerator 13, and a tail gas chimney 14, an air inlet end of the main combustion chamber 4 being connected to the oxygen flow regulating valve 1, the fuel gas flow regulating valve 2, the nitrogen flow regulating valve 3, and the acid gas flow regulating valve 5 in sequence, the primary reaction preheater 7, the secondary reaction preheater 8, the tertiary reaction preheater 9, and the quaternary reaction preheater 10 being connected to upper air inlets of the four claus catalytic reactors 12 respectively, the four Claus catalytic reactors 12 are sequentially communicated, the gas outlet ends of the first three Claus catalytic reactors 12 are connected with the gas inlet end of the sulfur cooler 11, the fourth Claus catalytic reactor 12 is connected with the incinerator 13, and the incinerator 13 is connected with the tail gas chimney 14;
the sulfur recovery process using fuel gas blending combustion comprises the following steps:
s1: performing ignition pretreatment, connecting and debugging each device, introducing nitrogen to purge each device before use, and ensuring that no residual impurities exist in the device before ignition;
s2: igniting and preheating, namely opening an oxygen flow regulating valve 1 and a fuel gas flow regulating valve 2 to ensure that the fuel gas flow and the oxygen flow are minimum flows capable of maintaining combustion, and igniting in a main combustion chamber hearth 6 of a main combustion chamber 4;
s3: catalytic preheating, namely introducing medium-pressure steam to preheat and heat a primary reaction preheater 7, a secondary reaction preheater 8, a tertiary reaction preheater 9, a quaternary reaction preheater 10 and four Claus catalytic reactors 12, and after the catalytic reactors are heated to the design temperature, ensuring that the fuel gas is fully combusted by adjusting the flow of an oxygen flow regulating valve 1 and a fuel gas flow regulating valve 2;
s4: and (3) carrying out catalytic reaction, opening the acid gas flow regulating valve 5 to introduce acid gas and gradually increasing the acid gas to the maximum value, and controlling the proportion of oxygen and the acid gas to be 0.13 all the time by regulating the opening degree of the oxygen gas flow regulating valve 1: 1, gradually reducing the flow of the fuel gas after the combustion is stable but not completely withdrawing, and adjusting the flow of the fuel gas to control the temperature of the combustion chamber to be 950-1050 ℃.
In the invention, the fuel gas components mainly comprise H2 and CO, and the content of alcohol ether organic matters such as methanol, ethanol, dimethyl ether and the like in the fuel gas is not higher than 1%.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (2)
1. A sulfur recovery process using fuel gas to mix combustion is characterized in that the sulfur recovery process is implemented by a sulfur recovery device, the sulfur recovery device comprises an oxygen flow regulating valve (1), a fuel gas flow regulating valve (2), a nitrogen flow regulating valve (3), a main combustion chamber (4), an acid gas flow regulating valve (5), a main combustion chamber hearth (6), a primary reaction preheater (7), a secondary reaction preheater (8), a tertiary reaction preheater (9), a quaternary reaction preheater (10), a sulfur cooler (11), four Claus catalytic reactors (12), an incinerator (13) and a tail gas chimney (14), the air inlet end of the main combustion chamber (4) is sequentially connected with the oxygen flow regulating valve (1), the fuel gas flow regulating valve (2), the nitrogen flow regulating valve (3) and the acid gas flow regulating valve (5), the first-stage reaction preheater (7), the second-stage reaction preheater (8), the third-stage reaction preheater (9) and the fourth-stage reaction preheater (10) are respectively connected with air inlets at the upper parts of four Claus catalytic reactors (12), the four Claus catalytic reactors (12) are sequentially communicated, the air outlet ends of the first three Claus catalytic reactors (12) are connected with the air inlet end of a sulfur cooler (11), the fourth Claus catalytic reactor (12) is connected with an incinerator (13), and the incinerator (13) is connected with a tail gas chimney (14);
the sulfur recovery process using fuel gas blending combustion comprises the following steps:
s1: performing ignition pretreatment, connecting and debugging each device, introducing nitrogen to purge each device before use, and ensuring that no residual impurities exist in the device before ignition;
s2: igniting and preheating, namely opening an oxygen flow regulating valve (1) and a fuel gas flow regulating valve (2) to ensure that the fuel gas flow and the oxygen flow are minimum flows capable of maintaining combustion, and igniting in a main combustion chamber hearth (6) of a main combustion chamber (4);
s3: the method comprises the following steps of (1) catalytic preheating, wherein medium-pressure steam is introduced to preheat a first-stage reaction preheater (7), a second-stage reaction preheater (8), a third-stage reaction preheater (9), a fourth-stage reaction preheater (10) and four Claus catalytic reactors (12), and after the catalytic reactors are heated to the design temperature, the flow of an oxygen flow regulating valve (1) and a fuel gas flow regulating valve (2) is adjusted to ensure that the fuel gas is fully combusted by 95%;
s4: and (3) carrying out catalytic reaction, opening the acid gas flow regulating valve (5), introducing acid gas, gradually increasing the acid gas to the maximum value, and controlling the proportion of oxygen and the acid gas to be 0.13 all the time by regulating the opening degree of the oxygen gas flow regulating valve (1): 1, gradually reducing the flow of the fuel gas after the combustion is stable but not completely withdrawing, and adjusting the flow of the fuel gas to control the temperature of the combustion chamber to be 950-1050 ℃.
2. The process of claim 1, wherein the fuel gas comprises mainly H2 and CO, and the content of organic alcohol ethers such as methanol, ethanol, dimethyl ether, etc. in the fuel gas is not higher than 1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110768546.1A CN113415788A (en) | 2021-07-07 | 2021-07-07 | Sulfur recovery process by using fuel gas for blending combustion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110768546.1A CN113415788A (en) | 2021-07-07 | 2021-07-07 | Sulfur recovery process by using fuel gas for blending combustion |
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| Publication Number | Publication Date |
|---|---|
| CN113415788A true CN113415788A (en) | 2021-09-21 |
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| CN202110768546.1A Withdrawn CN113415788A (en) | 2021-07-07 | 2021-07-07 | Sulfur recovery process by using fuel gas for blending combustion |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080050306A1 (en) * | 2006-08-25 | 2008-02-28 | Conocophillips Company | Increased Capacity Sulfur Recovery Plant and Process for Recovering Elemental Sulfur |
| CN101519192A (en) * | 2009-03-27 | 2009-09-02 | 成都赛普瑞兴科技有限公司 | Low temperature Claus sulfur recovery process and device therefor |
| CN102952589A (en) * | 2012-10-25 | 2013-03-06 | 李红凯 | Method for removing acid gas out of raw gas or shifted gas of raw gas |
| CN103822217A (en) * | 2014-02-14 | 2014-05-28 | 江苏新世纪江南环保股份有限公司 | Acidic gas pretreatment process |
| CN108557773A (en) * | 2018-04-18 | 2018-09-21 | 陕西未来能源化工有限公司 | A kind of Crouse's temperature control system and its method |
| CN208032280U (en) * | 2018-03-12 | 2018-11-02 | 云南大为制氨有限公司 | A kind of Sulfur Recovery Unit tail gas by ammonia method desulphurization system |
-
2021
- 2021-07-07 CN CN202110768546.1A patent/CN113415788A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080050306A1 (en) * | 2006-08-25 | 2008-02-28 | Conocophillips Company | Increased Capacity Sulfur Recovery Plant and Process for Recovering Elemental Sulfur |
| CN101519192A (en) * | 2009-03-27 | 2009-09-02 | 成都赛普瑞兴科技有限公司 | Low temperature Claus sulfur recovery process and device therefor |
| CN102952589A (en) * | 2012-10-25 | 2013-03-06 | 李红凯 | Method for removing acid gas out of raw gas or shifted gas of raw gas |
| CN103822217A (en) * | 2014-02-14 | 2014-05-28 | 江苏新世纪江南环保股份有限公司 | Acidic gas pretreatment process |
| CN208032280U (en) * | 2018-03-12 | 2018-11-02 | 云南大为制氨有限公司 | A kind of Sulfur Recovery Unit tail gas by ammonia method desulphurization system |
| CN108557773A (en) * | 2018-04-18 | 2018-09-21 | 陕西未来能源化工有限公司 | A kind of Crouse's temperature control system and its method |
Non-Patent Citations (1)
| Title |
|---|
| 马永波等: "高含硫天然气净化厂总硫回收率的主要影响因素探讨", 《山东化工》 * |
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Application publication date: 20210921 |