CN215886871U - System for preventing excessive oxygenation of device for preparing ethylene glycol from synthesis gas - Google Patents
System for preventing excessive oxygenation of device for preparing ethylene glycol from synthesis gas Download PDFInfo
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- CN215886871U CN215886871U CN202122170899.XU CN202122170899U CN215886871U CN 215886871 U CN215886871 U CN 215886871U CN 202122170899 U CN202122170899 U CN 202122170899U CN 215886871 U CN215886871 U CN 215886871U
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Abstract
The utility model relates to the field of synthesis gas ethylene glycol preparation, in particular to a system for preventing an excessive oxygen addition amount of a synthesis gas ethylene glycol preparation device, which comprises a synthesis gas ethylene glycol preparation device and a monitoring system; the monitoring system includes: a first monitoring unit for collecting the total amount of nitric oxide entering the pre-reaction unit; the second monitoring unit is used for collecting the total amount of oxygen entering the pre-reaction unit; an information conversion unit for calculating a ratio of nitric oxide to oxygen based on the total amount of nitric oxide and the total amount of oxygen, and performing a judgment of whether the ratio is within a predetermined range; and the alarm unit is used for starting to send out an alarm when the ratio is not in a preset range. According to the utility model, the monitoring system is arranged on the device for preparing the ethylene glycol from the synthesis gas, so that the NO is in an excessive state in the oxidation esterification reaction, the oxygen penetration phenomenon is effectively avoided, and the safety and stability of the operation of the device are ensured.
Description
Technical Field
The utility model relates to the field of synthesis gas ethylene glycol preparation, in particular to a system for preventing an oxygen adding excess of a synthesis gas ethylene glycol preparation device.
Background
In the process of synthesizing the ethylene glycol, carbonylation and esterification form a process cycle of synthesis and regeneration, while the process of synthesizing MN by esterification is a pure oxygen process, if the operation of an esterification unit is improper, the oxygen is excessively added, oxygen penetration is caused, the carbonylation catalyst forms strong oxidation reaction, and the temperature runaway accident of the carbonylation reactor is caused.
It is generally considered that NO and O are introduced into the pre-reactor2At a volume ratio of 6-8, the system is safe, but NO direct monitoring means for NO/O is available at present2In the actual operation of the volume ratio method, the NO content at the inlet of the carbonylation reactor is monitored after the oxygen addition amount is adjusted, and if excessive NO still exists at the inlet of the carbonylation reactor, the oxygen is considered not to be excessive. However, this method is monitored after the reaction, and is relatively delayed, so that the occurrence of oxygen breakthrough cannot be completely avoided.
Therefore, the method can be used for monitoring NO/O entering the gas phase of the esterification pre-reactor in real time2A volumetric ratio system is very necessary.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defect of monitoring NO/O in the prior art2Volumetric ratio system memoryIn the hysteresis, the problem of "oxygen breakthrough" cannot be completely avoided, and a system for preventing the oxygen addition of a syngas to ethylene glycol plant from being excessive is provided.
In order to achieve the above object, the present invention provides a system for preventing an excess oxygen addition amount of a synthesis gas ethylene glycol preparation device, comprising a synthesis gas ethylene glycol preparation device and a monitoring system; the device for preparing the ethylene glycol from the synthesis gas comprises a pre-reaction unit, a first esterification tower and a carbonylation reactor which are sequentially communicated; the nitric oxide conveying main pipe is communicated with the pre-reaction unit through a pipeline and is used for conveying nitric oxide-containing gas to the pre-reaction unit; the oxygen conveying pipeline is communicated with the pre-reaction unit and is used for conveying oxygen to the pre-reaction unit; the monitoring system includes:
a first monitoring unit for collecting the total amount of nitric oxide entering the pre-reaction unit;
the second monitoring unit is connected with the oxygen conveying pipeline and used for collecting the total amount of oxygen entering the pre-reaction unit;
the information conversion unit is respectively connected with the first monitoring unit and the second monitoring unit and is used for calculating the ratio of nitric oxide to oxygen according to the total amount of nitric oxide and the total amount of oxygen and judging whether the ratio is in a preset range;
and the alarm unit is connected with the information conversion unit and is used for starting to send out an alarm when the ratio is not in a preset range.
Preferably, the synthesis gas ethylene glycol preparation device further comprises a second esterification tower and a third esterification tower, wherein the second esterification tower is communicated with the nitric oxide delivery main through a first pipeline;
the third esterification tower is communicated with the nitric oxide delivery main through a second pipeline.
Preferably, the first monitoring unit includes:
the first flowmeter is arranged on the nitric oxide delivery main pipe and is used for collecting a first flow of nitric oxide-containing gas in the nitric oxide delivery main pipe;
a second flow meter arranged on the first pipeline and used for collecting a second flow of the nitric oxide-containing gas entering the second esterification tower;
a third flow meter, arranged on the second pipeline, for collecting a third flow of the nitric oxide-containing gas entering the third esterification tower;
and the first calculating module is respectively connected with the first flow meter, the second flow meter and the third flow meter and is used for calculating a fourth flow of the nitric oxide-containing gas entering the pre-reaction unit according to numerical values of the first flow, the second flow and the third flow.
Preferably, the first monitoring unit further comprises an analyzing unit arranged on the nitric oxide delivery manifold for acquiring the volumetric concentration of nitric oxide in the nitric oxide comprising gas.
Preferably, the first monitoring unit further comprises a second calculation module, which is connected to the first calculation module and the analysis unit, respectively, and is configured to calculate a total amount of nitric oxide entering the pre-reaction unit according to the fourth flow rate and a value of the volumetric concentration of nitric oxide in the nitric oxide-containing gas.
Preferably, the pre-reaction unit comprises a first pre-reactor and a second pre-reactor,
the first pre-reactor is communicated with the oxygen conveying pipeline through a first branch pipeline, and a fifth flowmeter is arranged on the first branch pipeline and used for collecting a first oxygen component entering the first pre-reactor;
the second pre-reactor is communicated with the oxygen conveying pipeline through a second branch pipeline, and a fourth flowmeter is arranged on the second branch pipeline and used for collecting a second oxygen component entering the second pre-reactor.
Preferably, the second monitoring unit further comprises a third calculating module, connected to the fifth flow meter and the fourth flow meter respectively, for calculating the total amount of oxygen entering the pre-reaction unit according to the values of the first oxygen component and the second oxygen component.
Preferably, the oxygen conveying pipeline is provided with a first flow regulating valve for regulating the total amount of oxygen entering the pre-reaction unit.
Preferably, a second flow regulating valve is arranged on the first branch pipeline and used for regulating the first oxygen component entering the first pre-reactor.
Preferably, the second branch pipeline is provided with a third flow regulating valve for regulating the second oxygen component entering the second pre-reactor.
Through the technical scheme, the monitoring system is arranged on the device for preparing the ethylene glycol from the synthesis gas, and the ratio of nitric oxide to oxygen in the circulating gas entering the pre-reaction unit can be accurately calculated, so that the condition that NO is in an excessive state in the oxidation esterification reaction is ensured, the phenomenon of oxygen penetration is effectively avoided, and the safety and stability of the operation of the device are ensured.
Drawings
FIG. 1 is a schematic diagram of a system for preventing an excess of oxygen in a syngas to ethylene glycol plant in accordance with one embodiment of the present invention;
FIG. 2 is a schematic diagram of a monitoring system according to an embodiment of the utility model.
Description of the reference numerals
1. Nitric oxide delivery main pipe 2 and oxygen delivery pipeline
3. Pre-reaction unit 5, second esterification column
6. Third esterification column 7, first esterification column
8. Carbonylation reactor 10, first pipeline
11. First flowmeter 12, second flowmeter
13. Third flow meter 14, analysis unit
15. Line 20, first flow regulating valve
21. Fourth flowmeter 22, fifth flowmeter
23. First branch pipeline 24 and second branch pipeline
25. Second flow rate adjustment valve 26 and third flow rate adjustment valve
31. A first prereactor 32, a second prereactor
100. First monitoring unit 200, second monitoring unit
300. Information conversion unit 400 and alarm unit
C1, a first computing module C2, a second computing module
C3, third calculation module 9 and second pipeline
Detailed Description
The following detailed description of embodiments of the utility model refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, the use of directional terms such as "upper, lower, left, right" generally means upper, lower, left, right as viewed with reference to the accompanying drawings, unless otherwise specified; "inner and outer" generally refer to the inner and outer relative to the profile of the components themselves; "distal and proximal" generally refer to distance relative to the contour of the components themselves.
FIG. 1 is a schematic diagram of a system for preventing an excess of oxygen in a syngas to ethylene glycol plant in accordance with one embodiment of the present invention; the utility model provides a system for preventing an excessive oxygenation device for preparing ethylene glycol from synthesis gas, which comprises a device for preparing ethylene glycol from synthesis gas and a monitoring system; the device for preparing the ethylene glycol from the synthesis gas comprises a pre-reaction unit 3, a first esterification tower 7 and a carbonylation reactor 8 which are sequentially communicated; and a nitric oxide delivery manifold 1, which is communicated with the pre-reaction unit 3 through a pipeline 15 and is used for delivering nitric oxide-containing gas to the pre-reaction unit 3; the oxygen conveying pipeline 2 is communicated with the pre-reaction unit 3 and is used for conveying oxygen to the pre-reaction unit 3;
the monitoring system includes:
A second monitoring unit 200 connected to the oxygen delivery line 2 for collecting the total amount n of oxygen entering the pre-reaction unit 32；
An information conversion unit 300, respectively connected to the first monitoring unit 100 and the second monitoring unit 200, for calculating a ratio n of nitric oxide to oxygen according to the total amount of nitric oxide and the total amount of oxygen1/n2And executing judgment whether the ratio is in a preset range;
an alarm unit 400 connected to the information conversion unit 300 for generating the ratio n1/n2And when the current time is not within the preset range, the alarm is sent out.
The device for preparing the ethylene glycol from the synthesis gas is provided with the monitoring system, so that the total amount of the nitric oxide and the total amount of the oxygen in the recycle gas entering the pre-reaction unit can be accurately calculated, and the ratio (NO/O) of the nitric oxide and the oxygen entering the pre-reaction unit is calculated according to the total amount of the nitric oxide and the total amount of the oxygen2) Thereby ensuring that NO is in an excessive state in the pre-reaction unit and the first esterification tower (oxidation esterification reaction), effectively avoiding the phenomenon of oxygen penetration and ensuring the safety and stability of the operation of the device.
In some preferred embodiments of the present invention, the apparatus for producing ethylene glycol from syngas further comprises a second esterification column 5 and a third esterification column 6, wherein the second esterification column 5 is communicated with the nitric oxide delivery main 1 through a first pipeline 10; the third esterification column 6 is in communication with the nitric oxide delivery manifold 1 via a second line 9.
According to the present invention, preferably, the first monitoring unit 100 includes:
a first flow meter 11, arranged on the nitric oxide delivery main pipe 1, for collecting a first flow A of nitric oxide-containing gas in the nitric oxide delivery main pipe 11；
A second flow meter 12 arranged on the first pipeline 10 for collecting the incoming gasSecond flow rate A of nitric oxide-containing gas in second esterification column 52；
A third flow meter 13, arranged on the second pipeline 9, for collecting a third flow A of the nitric oxide containing gas entering the third esterification column 63；
A first calculating module C1, connected to the first flow meter 11, the second flow meter 12, and the third flow meter 13, respectively, for calculating a fourth flow rate a of the nitric oxide-containing gas entering the pre-reaction unit according to numerical values of the first flow rate, the second flow rate, and the third flow rate4Wherein a fourth flow A of nitric oxide comprising gas into said pre-reaction unit4＝A1-A2-A3。
According to the present invention, preferably, said first monitoring unit 100 further comprises an analyzing unit 14 arranged on said nitric oxide delivery manifold 1 for acquiring the volumetric concentration V of nitric oxide in said nitric oxide comprising gas.
According to the present invention, preferably, said first monitoring unit 100 further comprises a second calculating module C2 connected to said first calculating module C1 and said analyzing unit 14, respectively, for calculating a total amount n of nitric oxide entering said pre-reaction unit based on values of a fourth flow rate and a volumetric concentration of nitric oxide in said nitric oxide comprising gas1Wherein the total amount n of nitric oxide entering the pre-reaction unit1＝A4×V。
Preferably, the pre-reaction unit 3 comprises a first pre-reactor 31 and a second pre-reactor 32, the first pre-reactor 31 is communicated with the oxygen conveying pipeline 2 through a first branch pipeline 23, a fifth flow meter 22 is arranged on the first branch pipeline 23, and is used for collecting a first oxygen component B entering the first pre-reactor 311；
The second pre-reactor 32 is communicated with the oxygen conveying pipeline 2 through a second branch pipeline 24, and a fourth flowmeter 21 is arranged on the second branch pipeline 24 and used for collecting a second oxygen component B entering the second pre-reactor 322。
Preferably, the second monitoring unit 200 further comprises a third calculation module C3 connected to the fifth flow meter 22 and the fourth flow meter 23, respectively, for calculating a first oxygen fraction B based on the first oxygen fraction B1And the second oxygen component B2Is calculated as the total amount of oxygen n entering the pre-reaction unit 32Wherein n is2＝B1+B2。
In the present invention, when the ratio n of the total amount of nitric oxide to the total amount of oxygen is1/n2When the oxygen content is less than or equal to 6, the oxygen in the pre-reaction unit 3 is judged to be in an excessive state, and the alarm unit 400 is started and executes to give an alarm.
In the present invention, after the alarm unit 400 gives an alarm, the operator can adjust the ratio n of nitric oxide to oxygen by adjusting the total amount of oxygen entering the pre-reaction unit 31/n2Preferably, the oxygen conveying pipeline 2 is provided with a first flow regulating valve 20 for regulating the total amount of oxygen entering the pre-reaction unit 3.
It is further preferred that a second flow regulating valve 25 is arranged on the first branch line 23 for regulating the first oxygen component B entering the first prereactor 311。
It is further preferred that the second branch line 24 is provided with a third flow control valve 26 for controlling a second oxygen fraction B entering the second prereactor 322。
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the utility model, numerous simple modifications can be made to the technical solution of the utility model, including combinations of the specific features in any suitable way, and the utility model will not be further described in relation to the various possible combinations in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (10)
1. A system for preventing a syngas to ethylene glycol plant from being over oxygenated, the system comprising a syngas to ethylene glycol plant and a monitoring system; the device for preparing the ethylene glycol from the synthesis gas comprises a pre-reaction unit (3), a first esterification tower (7) and a carbonylation reactor (8) which are communicated in sequence; and a nitric oxide delivery manifold (1) in communication with the pre-reaction unit (3) via a line (15) for delivering nitric oxide containing gas to the pre-reaction unit (3); the oxygen conveying pipeline (2) is communicated with the pre-reaction unit (3) and is used for conveying oxygen to the pre-reaction unit (3);
the monitoring system includes:
a first monitoring unit (100) for collecting the total amount of nitric oxide entering the pre-reaction unit (3);
the second monitoring unit (200) is connected with the oxygen conveying pipeline (2) and is used for collecting the total amount of oxygen entering the pre-reaction unit (3);
the information conversion unit (300) is respectively connected with the first monitoring unit (100) and the second monitoring unit (200) and is used for calculating the ratio of nitric oxide to oxygen according to the total amount of nitric oxide and the total amount of oxygen and judging whether the ratio is in a preset range or not;
and the alarm unit (400) is connected with the information conversion unit (300) and is used for starting to send out an alarm when the ratio is not in a preset range.
2. The system according to claim 1, wherein the syngas to ethylene glycol plant further comprises a second esterification column (5) and a third esterification column (6), the second esterification column (5) being in communication with the nitric oxide delivery manifold (1) via a first conduit (10);
the third esterification tower (6) is communicated with the nitric oxide delivery main pipe (1) through a second pipeline (9).
3. The system according to claim 2, characterized in that the first monitoring unit (100) comprises:
the first flow meter (11) is arranged on the nitric oxide delivery main pipe (1) and is used for collecting a first flow of nitric oxide-containing gas in the nitric oxide delivery main pipe (1);
a second flow meter (12) arranged on said first line (10) for taking a second flow of nitric oxide comprising gas into said second esterification column (5);
a third flow meter (13) arranged on the second line (9) for collecting a third flow of nitric oxide comprising gas into the third esterification column (6);
and the first calculating module (C1) is respectively connected with the first flow meter (11), the second flow meter (12) and the third flow meter (13) and is used for calculating a fourth flow of the nitric oxide-containing gas entering the pre-reaction unit according to numerical values of the first flow, the second flow and the third flow.
4. A system according to claim 3, wherein said first monitoring unit (100) further comprises an analyzing unit (14) arranged on said nitric oxide delivery manifold (1) for acquiring the volumetric concentration of nitric oxide in said nitric oxide comprising gas.
5. The system according to claim 4, wherein said first monitoring unit (100) further comprises a second calculation module (C2) connected to said first calculation module (C1) and said analysis unit (14), respectively, for calculating the total amount of nitric oxide entering said pre-reaction unit based on the values of the fourth flow rate and the volumetric concentration of nitric oxide in said nitric oxide comprising gas.
6. The system according to any of the claims 1 to 5, characterized in that the pre-reaction unit (3) comprises a first pre-reactor (31) and a second pre-reactor (32),
the first pre-reactor (31) is communicated with the oxygen conveying pipeline (2) through a first branch pipeline (23), and a fifth flowmeter (22) is arranged on the first branch pipeline (23) and used for collecting a first oxygen component entering the first pre-reactor (31);
the second pre-reactor (32) is communicated with the oxygen conveying pipeline (2) through a second branch pipeline (24), and a fourth flowmeter (21) is arranged on the second branch pipeline (24) and used for collecting a second oxygen component entering the second pre-reactor (32).
7. The system according to claim 6, characterized in that said second monitoring unit (200) further comprises a third calculation module (C3) connected to said fifth flow meter (22) and said fourth flow meter (21), respectively, for calculating the total amount of oxygen entering said pre-reaction unit (3) based on the values of said first and second oxygen fractions.
8. The system according to claim 6, characterized in that the oxygen supply line (2) is provided with a first flow regulating valve (20) for regulating the total amount of oxygen entering the pre-reaction unit (3).
9. A system according to claim 6, characterized in that the first branch line (23) is provided with a second flow regulating valve (25) for regulating the first oxygen fraction into the first prereactor (31).
10. A system according to claim 6, characterized in that the second branch line (24) is provided with a third flow regulating valve (26) for regulating the second oxygen fraction into the second prereactor (32).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122170899.XU CN215886871U (en) | 2021-09-08 | 2021-09-08 | System for preventing excessive oxygenation of device for preparing ethylene glycol from synthesis gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122170899.XU CN215886871U (en) | 2021-09-08 | 2021-09-08 | System for preventing excessive oxygenation of device for preparing ethylene glycol from synthesis gas |
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| CN215886871U true CN215886871U (en) | 2022-02-22 |
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