CN203217389U - Control system of reactor for preparing acrylic acid with propane through one-step method - Google Patents
Control system of reactor for preparing acrylic acid with propane through one-step method Download PDFInfo
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- CN203217389U CN203217389U CN 201320197589 CN201320197589U CN203217389U CN 203217389 U CN203217389 U CN 203217389U CN 201320197589 CN201320197589 CN 201320197589 CN 201320197589 U CN201320197589 U CN 201320197589U CN 203217389 U CN203217389 U CN 203217389U
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Abstract
The utility model relates to an automatic control system and specifically a control system of a reactor for preparing acrylic acid with propane through a one-step method. The control system of a reactor for preparing acrylic acid with propane through a one-step method is characterized by being provided with a propane feed material flow quantity automatic control system, a steam flow quantity automatic control system, a nitrogen feed material flow quantity automatic control system, an oxygen feed material flow quantity automatic control system, a cyclic tail gas flow quantity automatic control system, an oxygen content analyzing instrument, and an C3 content analyzing instrument. The oxygen content analyzing instrument and the C3 content analyzing instrument detects processes where signals are input into a DCS to take part in proportioning calculation; and therefore inlet quantities of steam, oxygen, nitrogen and cyclic tail gas can be accurately adjusted, and calculation results can reflect actual proportioning relation. The control system of a reactor for preparing acrylic acid with propane through a one-step method is advantageous in that the propane utilization rate is improved, and over-reaction or even explosion can be prevented from being caused while that an oxidation reaction proceeds normally is guaranteed. When the temperature or the pressure value of a reactor feed material or reaction parameters exceeds the limit, an alarm is automatically sent out in an interlocked manner, explosion gas can be prevented from being formed, and production safety and stability are guaranteed.
Description
Technical field
The utility model relates to a kind of automatic control system, in particular, relates to the automatic control system that a kind of petrochemical unit is used.
Background technology
Acrylic acid is a kind of important chemical material, is widely used in the production of various chemicals and resin.The industry of acrylic acid and ester is the important component part of world today's petrochemical complex production field.The acrylic acid traditional handicraft is by propylene two-step oxidation method for preparing acrylic acid, and the first step is the propylene oxidation acrolein; Second step obtained acrylic acid for acrolein oxidation, require equipment investment bigger because two-step approach prepares process, and energy dissipation was more serious, adopted propane to replace propylene to produce acrylic acid as raw material, investment that can saveall, reduced operating cost.
The propane one-step oxidation process is produced acrylic acid technology, mainly is to be raw material with propane, oxygen, issues angry phase oxidation reaction in the catalyzer condition, and its reaction equation is as follows:
CH
3-CH
2-CH
3+2O
2→CH
2＝CHCOOH(g)+2H
2O(g) ΔH＝-715kJ
Main subsidiary reaction has:
CH
3-CH
2-CH
3+3O
2→CH
3COOH+2H
2O+CO
2
CH
3-CH
2-CH
3+5O
2→4H
2O+3CO
2
It is as follows that the propane one-step oxidation process is produced acrylic acid technological process:
Oxygen, nitrogen, water vapor and recycled offgas fully mix in premixer 1, the operating temperature of premixer 1 is 123.2 ℃, on-stream pressure is 0.077MPaG, mixed gas enters entry mixers 2 fully to be mixed with propane, send into oxidation reactor 3, the operating temperature of entry mixers 2 is 224.7 ℃, on-stream pressure is 0.058MPaG, in oxidation reactor 3, propane and oxygen react accessory substances such as generating acrylic acid and carbon monoxide, carbon dioxide, acetic acid, propylene under the effect of oxidation catalyst.Oxidation reactor 3 is shell and tube reactor, and process gas is walked the tube side of reactor, and the operating temperature of import is 224.7 ℃, the operating temperature of outlet is 385 ℃, on-stream pressure is 0.028MPaG, and the shell side medium of oxidation reactor 3 is hot melt salt, is used for heating and safeguards the needed temperature of reaction.This reaction is the oxidation reaction of strong heat release, and reaction heat is shifted out by hot melt salt in the shell-side of reactor.
Because this process is the strong oxidation reaction of heat release, temperature of reaction is higher, for satisfying catalyst performance and production-scale requirement, need keep higher material concentration.Therefore, propane and oxygen mixture are operated in the scope near explosion limits, if can not strictly control each technological parameter, there is the potential danger of blast at any time in system.In addition, high performance catalyzer also has comparatively strict restriction to the raw material proportioning, and when having only the raw material proportioning to reach best proportioning point, catalyst performance just can farthest be brought into play.Therefore, course of reaction will have strict charging control.
Summary of the invention
The objective of the invention is to, provide a kind of propane oxidation step legal system acrylic acid automatic control system.
The key equipment of acrylic acid production is oxidation reactor, propane and circulating air in mixer with oxygen mix as reaction raw materials, thereby the flow control of propane and oxygen and circulating air is crucial, normally carries out to guarantee oxidation reaction, and do not cause acute reaction even blast.When the temperature of reactor feed or response parameter or force value transfinite, automatic interlock to be stopped, the interlock alarm system will cut off all material feeding.After propane and oxygen and inert gas etc. mix, can form explosion gas, therefore must strict control propane and the ratio of oxygen and circulating air, away from explosion hazard area.
A conversion ratio of this raw materials technology is lower, and is about 35%～45%, for improving the propane utilization factor, adopted the reaction end gas circulation technology, and the reaction end gas that major part contains propane is Returning reactor after compression, continues to participate in oxidation reaction.
The control system of a kind of propane single stage method acrylic acid reactor processed is characterized in that:
Be provided with propane feed automatic flow control system FIC-1, its flow detecting element, variable valve are located on the fresh propane pipeline of entry mixers 2, the flow transmitter output signal of propane feed automatic flow control system FIC-1 is advanced pulpit DCS and is participated in the proportioning computing as master variable as the active amount signal of flowrate proportioning system;
Be provided with steam flow automatic control system FIC-2, its flow detecting element of steam flow automatic control system FIC-2, variable valve are located at steam and enter on the pipeline of premixer 1, the flow transmitter output signal of steam flow automatic control system FIC-2, as the flowrate proportioning system from one of momentum signal, advance pulpit DCS, participate in computing;
Be provided with nitrogen feed automatic flow control system FIC-3, its flow detecting element of nitrogen feed automatic flow control system FIC-3, variable valve are located at nitrogen and enter on the pipeline of premixer 1, the flow transmitter output signal of nitrogen feed automatic flow control system FIC-3 as the flowrate proportioning system from one of momentum signal, advance pulpit DCS, participate in computing;
Be provided with oxygen feeding automatic flow control system FIC-4, its flow detecting element of oxygen feeding automatic flow control system FIC-4, variable valve are located at oxygen and enter on the pipeline of premixer 1, the flow transmitter output signal of oxygen feeding automatic flow control system FIC-4 as the flowrate proportioning system from one of momentum signal, advance pulpit DCS, participate in computing;
Be provided with recycled offgas automatic flow control system FIC-5, its flow detecting element of recycled offgas automatic flow control system FIC-5, variable valve are located at recycled offgas and enter on the pipeline of premixer 1, the flow transmitter output signal of recycled offgas automatic flow control system FIC-5, as the flowrate proportioning system from one of momentum signal, advance pulpit DCS, participate in computing;
Be provided with oxygen content analyser AI-1, oxygen content analyser AI-1 detects the oxygen content of circulating air, and its output signal is delivered to DCS in the pulpit, participates in computing;
Be provided with C
3Content analyzer AI-2, C
3Content analyzer AI-2 detects the C of recycled offgas
3Content, its output signal is delivered to DCS in the pulpit, participates in computing;
More than two kinds of analyser detection signals input DCS participate in proportionings and calculate, can accurate more steam regulation, the inlet of oxygen, nitrogen, recycled offgas, result of calculation can reflect actual proportion relation more.
The variable valve of propane feed automatic flow control system FIC-1 receives the output signal of propane feed automatic flow control system FIC-1 regulator among the DCS; The variable valve separately of steam flow automatic control system FIC-2, nitrogen feed automatic flow control system FIC-3, oxygen feeding automatic flow control system FIC-4, recycled offgas automatic flow control system FIC-5 receives the DCS output signal work that results in automatically.
Advantage of the present utility model adopts the reaction end gas circulation technology, and the reaction end gas that major part contains propane is Returning reactor after compression, continues to participate in oxidation reaction, improves the propane utilization factor, economizes on resources.For the assurance oxidation reaction is normally carried out, and do not cause acute reaction even blast.When the temperature of reactor feed or response parameter or force value transfinite, automatic interlock is reported to the police, can not form explosion gas, guarantee production safety, operation stably.
Description of drawings
Fig. 1 is the simplified flow chart at band reference mark.
Fig. 2 concerns block scheme for automatic control system.
Premixer 1, entry mixers 2, oxidation reactor 3 are arranged among the figure.
Embodiment
Below in conjunction with accompanying drawing and instantiation the utility model is made further detailed description.
Be example with certain pilot-plant, be provided with propane, steam, nitrogen, oxygen, circulating air feed rate automatic control system, be provided with oxygen content analyser, C
3The flow quantity detecting system of water in content analyzer and the course of reaction.
The propane one-step oxidation process is produced the basic calculating of the automatic control system of acrylic acid oxidation reaction
Symbolic interpretation such as table 1:
Table-1
| Symbol | Symbolic significance | The source | Unit | Remarks |
| A | Circulating air C 3Content | Calculated value | g/kg | |
| B | Fresh propane is to |
Measured value | kg/h | |
| C | Steam is to premixer 1 | Measured value | kg/h | |
| D | Nitrogen is to premixer 1 | Measured value | kg/h | |
| E | Circulating air is to premixer 1 | Measured value | kg/h | |
| F | Oxygen is to premixer 1 | Measured value | kg/h | |
| B1 | To |
Calculated value | kg/h | |
| H | To |
Calculated value | kg/h | |
| I | To |
Calculated value | kg/h | |
| J | To |
Calculated value | kg/h | |
| K | To |
Calculated value | kg/h | |
| W1 | The actual production load | Calculated value | ％ | |
| Q | Device is the propane flow at full capacity | Design load | kg/h | |
| M | To |
Calculated value | kg/h | |
| N | To |
Calculated value | kg/h | |
| O | To |
Calculated value | kg/h | |
| P | To |
Calculated value | kg/h | |
| W | FIC-1 propylene flow setting value | Input value | kg/h | |
| R | FIC-2 steam flow setting value | Calculated value | kg/h | |
| S | FIC-3 nitrogen flow setting value | Calculated value | kg/h | |
| T | FIC-5 circulating air flow setting value | Calculated value | kg/h | |
| U | FIC-4 oxygen flow setting value | Calculated value | kg/h | |
| Y | The circulating air water cut | Calculated value | g/kg | |
| Z | Circulating air contains nitrogen amount | Calculated value | g/kg | |
| V | The oxygenous amount of circulating air | Calculated value | g/kg |
In the device operating process, by propane flow control system input propane flow, the DCS control program namely calculates the needs flow value of steam, oxygen, nitrogen and circulating air according to the charging proportion relation of setting, and with this numerical value automatically as the setting of corresponding discharge variable valve.
The utility model is according to the actual feed rate of propane, automatically be equipped with steam, oxygen, nitrogen, the recycled offgas of fixed ratio, because having realized steam, oxygen, nitrogen, recycled offgas flow regulates in real time automatically according to the actual feed rate of propane, reduced artificial interference, operation safe is stable.
By adopting advanced DCS control system, under equal catalyzer and same operation condition, can improve the acrylic acid yield, economic benefit is considerable.
Claims (1)
1. the control system of a propane single stage method acrylic acid reactor processed is characterized in that:
Be provided with propane feed automatic flow control system (FIC-1), its flow detecting element, variable valve are located on the fresh propane pipeline of entry mixers (2), the flow transmitter output signal of propane feed automatic flow control system (FIC-1) is advanced pulpit DCS and is participated in the proportioning computing as master variable as the active amount signal of flowrate proportioning system;
Be provided with steam flow automatic control system (FIC-2), its flow detecting element of steam flow automatic control system (FIC-2), variable valve are located at steam and enter on the pipeline of premixer (1), the flow transmitter output signal of steam flow automatic control system (FIC-2), as the flowrate proportioning system from one of momentum signal, advance pulpit DCS, participate in computing;
Be provided with nitrogen feed automatic flow control system (FIC-3), its flow detecting element of nitrogen feed automatic flow control system (FIC-3), variable valve are located at nitrogen and enter on the pipeline of premixer (1), the flow transmitter output signal of nitrogen feed automatic flow control system (FIC-3) as the flowrate proportioning system from one of momentum signal, advance pulpit DCS, participate in computing;
Be provided with oxygen feeding automatic flow control system (FIC-4), its flow detecting element of oxygen feeding automatic flow control system (FIC-4), variable valve are located at oxygen and enter on the pipeline of premixer (1), the flow transmitter output signal of oxygen feeding automatic flow control system (FIC-4) as the flowrate proportioning system from one of momentum signal, advance pulpit DCS, participate in computing;
Be provided with recycled offgas automatic flow control system (FIC-5), its flow detecting element of recycled offgas automatic flow control system (FIC-5), variable valve are located at recycled offgas and enter on the pipeline of premixer (1), the flow transmitter output signal of recycled offgas automatic flow control system (FIC-5), as the flowrate proportioning system from one of momentum signal, advance pulpit DCS, participate in computing;
Be provided with oxygen content analyser (AI-1), oxygen content analyser (AI-1) detects the oxygen content of circulating air, and its output signal is delivered to DCS in the pulpit, participates in computing;
Be provided with C
3Content analyzer (AI-2), C
3Content analyzer (AI-2) detects the C of recycled offgas
3Content, its output signal is delivered to DCS in the pulpit, participates in computing;
More than two kinds of analyser detection signals input DCS participate in proportionings and calculate, can accurate more steam regulation, the inlet of oxygen, nitrogen, recycled offgas, result of calculation can reflect actual proportion relation more;
The variable valve of propane feed automatic flow control system (FIC-1) receives the output signal of propane feed automatic flow control system (FIC-1) regulator among the DCS; The variable valve separately of steam flow automatic control system (FIC-2), nitrogen feed automatic flow control system (FIC-3), oxygen feeding automatic flow control system (FIC-4), recycled offgas automatic flow control system (FIC-5) receives the DCS output signal work that results in automatically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320197589 CN203217389U (en) | 2013-04-07 | 2013-04-07 | Control system of reactor for preparing acrylic acid with propane through one-step method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320197589 CN203217389U (en) | 2013-04-07 | 2013-04-07 | Control system of reactor for preparing acrylic acid with propane through one-step method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203217389U true CN203217389U (en) | 2013-09-25 |
Family
ID=49206909
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|---|---|---|---|
| CN 201320197589 Expired - Lifetime CN203217389U (en) | 2013-04-07 | 2013-04-07 | Control system of reactor for preparing acrylic acid with propane through one-step method |
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| Country | Link |
|---|---|
| CN (1) | CN203217389U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104391451A (en) * | 2014-09-25 | 2015-03-04 | 中国石油化工股份有限公司 | Control method for preventing explosion of methanol to olefins (MTO) apparatus reactor |
| CN104437270A (en) * | 2014-11-14 | 2015-03-25 | 中国石油集团东北炼化工程有限公司吉林设计院 | Acrylic acid reaction system |
| CN107837646A (en) * | 2017-11-28 | 2018-03-27 | 江苏科威环保技术有限公司 | The safe controlling device of more component organic exhaust gas and its technique |
| CN113368786A (en) * | 2021-06-10 | 2021-09-10 | 浙江久立特材科技股份有限公司 | Mixed atmosphere high-temperature gas-solid reaction device containing water vapor and control method |
-
2013
- 2013-04-07 CN CN 201320197589 patent/CN203217389U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104391451A (en) * | 2014-09-25 | 2015-03-04 | 中国石油化工股份有限公司 | Control method for preventing explosion of methanol to olefins (MTO) apparatus reactor |
| CN104437270A (en) * | 2014-11-14 | 2015-03-25 | 中国石油集团东北炼化工程有限公司吉林设计院 | Acrylic acid reaction system |
| CN107837646A (en) * | 2017-11-28 | 2018-03-27 | 江苏科威环保技术有限公司 | The safe controlling device of more component organic exhaust gas and its technique |
| CN113368786A (en) * | 2021-06-10 | 2021-09-10 | 浙江久立特材科技股份有限公司 | Mixed atmosphere high-temperature gas-solid reaction device containing water vapor and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200927 Address after: 132002 3-6 and 9-13 floors of Block A, Jihua Economic and Trade Center, Tongtan Road, Changyi District, Jilin Province Patentee after: PetroChina Jilin Chemical Engineering Co.,Ltd. Address before: 132001 Jilin District of Changyi province Tong Tan Road Jihua Trade Center building A Patentee before: JILIN DESIGNING INSTITUTE OF CNPC NORTHEAST REFINING & CHEMICAL ENGINEERING Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130925 |