CN1199920C - Control method of acetylene content at exit of acetylene hydrogenation reactor - Google Patents
Control method of acetylene content at exit of acetylene hydrogenation reactor Download PDFInfo
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- CN1199920C CN1199920C CN 01144462 CN01144462A CN1199920C CN 1199920 C CN1199920 C CN 1199920C CN 01144462 CN01144462 CN 01144462 CN 01144462 A CN01144462 A CN 01144462A CN 1199920 C CN1199920 C CN 1199920C
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Abstract
The present invention provides a method for controlling the content of ethyne in an outlet of an ethyne hydrogenation reactor, which comprises that parameters capable of being measured of the reactor are collected in real time and at least are the actual measurement value of the concentration of the ethyne in an inlet of the reactor, the actual measurement value of the concentration of the ethyne in the outlet of the reactor and the artificial set value of the concentration of the ethyne in the outlet of the reactor; the collected parameters capable of being measured are used as the input amount complexly controlled by the content of the ethyne in the outlet of the reactor; the hydrogen distribution amount of the inlet of the reactor is automatically regulated; the content of the ethyne in the outlet of the reactor is controlled by a closed loop. The present invention enhances the yield of the product and reduces the energy consumption.
Description
Technical field
The present invention relates to petrochemical complex ethylene industry field, specifically a kind of control method of acetylene content at exit of acetylene hydrogenation reactor.
Background technology
In the acetylene hydrogenation reactor (hereinafter to be referred as reactor), the reactor outlet acetylene content is the index that can characterize the reactor outlet quality product.Therefore one of major objective of acetylene hydrogenation reactor control is to guarantee reactor outlet acetylene content (the outlet acetylene content＜5ppm) that do not transfinite.Present most of ethylene production producer is basic identical to the control method of reactor outlet acetylene content, that is: analyze according to the reactor outlet acetylene content, the hydrogen amount of joining of artificial, the import of experimental conditioned reaction device, so that the reactor outlet acetylene content is controlled, make reactor outlet acetylene content＜5ppm, this has just brought bigger personal errors inevitably.And in actually operating, because the reactor outlet acetylene content is unknowable (on line analyzer exist bigger analysis delay) in real time, in order to make product qualified, often adopt a kind of conservative hydrogen amount adjustment method of joining, that is: artificial excessive method of joining hydrogen is though this method can make reactor outlet acetylene content＜1ppm, even be tending towards 0, but product ethene also is converted to ethane in a large number, directly causes the reduction of ethylene yield meanwhile.
Therefore in the prior art to the control method of reactor outlet acetylene content, be a kind of based on manual regulation, open-loop control method, its drawback is that controlling quality is not high, the result who causes is that productive rate is not high, can not effectively save energy and reduce the cost and coordination optimization.
Summary of the invention
The object of the present invention is to provide a kind of control method of acetylene content at exit of acetylene hydrogenation reactor, can carry out online detection to the parameter surveyed of influence outlet acetylene content in the reactor, unknowable in real time with reactor outlet acetylene content in the solution prior art, the defective that can only judge by rule of thumb, make that the open loop control based on artificial experience and manual regulation becomes automatic detection and self-regulating closed-loop control in the prior art, thereby realized the edge safety control of reactor outlet acetylene, and avoided the excessive hydrogen of joining, improved controlling quality, reached the raising product yield, the purpose of energy-saving and cost-reducing and coordination optimization.
The present invention is a kind of control method of acetylene content at exit of acetylene hydrogenation reactor, comprising, gather the parameter surveyed of reactor in real time, this can be surveyed parameter and be at least: Reactor inlet concentration of acetylene measured value, reactor outlet concentration of acetylene measured value, the artificial set(ting)value of reactor outlet concentration of acetylene;
With the input that the parameter surveyed that collects is controlled as reactor outlet acetylene content complexity, the hydrogen amount of joining of automatic conditioned reaction device import.
The complicated control of described reactor outlet acetylene content comprises that the control of reactor outlet acetylene content adopts hydrogen alkynes to control than PTD, and its work output is the mass ratio that Reactor inlet is joined hydrogen amount and inlet amount.
The mass ratio that described Reactor inlet is joined hydrogen amount and inlet amount comprises, the mass ratio that this Reactor inlet is joined hydrogen amount and inlet amount obtains the hydrogen amount of joining of Reactor inlet after DCS handles.
The hydrogen amount of joining of described Reactor inlet comprises that this is joined the hydrogen amount and implements control as the set-point of the conventional control of Reactor inlet hydrogen flow, automatically the hydrogen amount of joining of conditioned reaction device import.
Described hydrogen alkynes comprises than PID control, can adopt feedback and feedforward means real-time closed-loop adjustment hydrogen alkynes ratio by the artificial set(ting)value of reactor outlet acetylene content and the difference of observed value, the variable quantity of Reactor inlet acetylene content.
The complicated control of described reactor outlet acetylene content comprises that the control law of this complexity control should satisfy following condition:
Δu(k)＝k′{kp1*{e(k)-e(k-1)}+(T
s/T
i)*e(k)}+kp2*e(k)`
Wherein:
Δ u (k): hydrogen flowing quantity and feed rate are used to control hydrogen flowing quantity than increment
E (k): the artificial set(ting)value of outlet alkynes and the difference of observed value
E (k) `: the measurement variation value of inlet alkynes
Kp1: feedback proportional coefficient
Kp2: feedforward scale-up factor
T
s: the sampling time
T
i: integral time
K ': transformation ratio changes into hydrogen flowing quantity and feed rate ratio with hydrogen alkynes mol ratio.
Described hydrogen alkynes comprises also that than PID control hydrogen alkynes obtains hydrogen alkynes ratio than the work output of PID control through control output verification as a result.
The method that the present invention controls with reactor outlet acetylene content complexity, through the conventional control of Reactor inlet hydrogen flow, the hydrogen amount of joining of automatic conditioned reaction device import, formed closed-loop control to reactor, improved controlling quality, guarantee the reactor outlet acetylene content do not transfinite (＜5ppm), and make the reactor outlet acetylene content by in the past less than 1ppm (even being tending towards 0), increase to 2ppm, prevented excessive hydrogen, the quality edge of joining effectively, received the raising product yield, the good result of energy-saving and cost-reducing and coordination optimization has been brought very big economic return.
Description of drawings
Fig. 1 is the functional block diagram of acetylene content at exit of acetylene hydrogenation reactor control method;
Fig. 2 is the functional block diagram of acetylene content at exit of acetylene hydrogenation reactor control method embodiment;
Fig. 3 is the process flow diagram of acetylene hydrogenation reactor.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
Embodiment 1
As shown in Figure 1, gather the parameter surveyed of reactor in real time, this can be surveyed parameter and be at least: Reactor inlet concentration of acetylene observed value, reactor outlet concentration of acetylene observed value, the artificial set(ting)value of reactor outlet concentration of acetylene; With the parameter surveyed that collects input as the complicated control of reactor outlet acetylene content; The complicated control of reactor outlet acetylene content is output as Reactor inlet and joins the input that the hydrogen amount is regulated, the hydrogen amount of joining in order to the import of automatic conditioned reaction device, formed closed-loop control to reactor, improved controlling quality, guarantee the reactor outlet acetylene content do not transfinite (＜5ppm), prevented excessive hydrogen, the quality edge of joining effectively, received the raising product yield, the good result of energy-saving and cost-reducing and coordination optimization has been brought very big economic return.
Embodiment 2
In Fig. 3, illustrated the technical process of an acetylene hydrogenation reactor, it is one three a bed series arrangement, raw material (Feed) adds in the reactor 1, can select G-58C type Pd catalyst series in the reactor 1 for use, join the hydrogen amount and regulate 2, can regulate the hydrogen amount of joining of Reactor inlet;
As shown in Figure 2, gather the parameter surveyed of reactor in real time, this can be surveyed parameter and be at least: Reactor inlet concentration of acetylene observed value, reactor outlet concentration of acetylene observed value, the artificial set(ting)value of reactor outlet concentration of acetylene;
With the input that the parameter surveyed that collects is controlled as reactor outlet acetylene content complexity, the complicated control of described reactor outlet acetylene content adopts hydrogen alkynes to control than PID, and its work output is the mass ratio that Reactor inlet is joined hydrogen amount and inlet amount.The mass ratio that described Reactor inlet is joined hydrogen amount and inlet amount comprises, the mass ratio that this Reactor inlet is joined hydrogen amount and inlet amount obtains the hydrogen amount of joining of Reactor inlet after DCS handles.Described DCS system can adopt the MOD300 in the ABB product;
The hydrogen amount of joining of described Reactor inlet comprises that this is joined the hydrogen amount and implements control as the set-point of the conventional control of Reactor inlet hydrogen flow, automatically the hydrogen amount of joining of conditioned reaction device import.
Described hydrogen alkynes comprises than PID control, can be by the set-point of reactor outlet concentration of acetylene through the input of data processing as PID control, itself and the difference of observed value, the variable quantity of Reactor inlet acetylene content adopt feedback and feedforward means real-time closed-loop to adjust hydrogen alkynes ratio.
The complicated control of described reactor outlet acetylene content is that hydrogen alkynes comprises that than PID control this hydrogen alkynes should satisfy following condition than the control law of PID control:
Δu(k)＝k′{kp1*{e(k)-e(k-1)}+(T
s/T
i)*e(k)}+kp2*e(k)`
Wherein:
Δ u (k): hydrogen flowing quantity and feed rate are used to control hydrogen flowing quantity than increment
E (k): the artificial set(ting)value of outlet alkynes and the difference of observed value
E (k) `: the measurement variation value of inlet alkynes
Kp1: feedback proportional coefficient
Kp2: feedforward scale-up factor
T
s: the sampling time
T
i: integral time
K ': transformation ratio changes into hydrogen flowing quantity and feed rate ratio with hydrogen alkynes mol ratio.
Described hydrogen alkynes comprises also that than PID control hydrogen alkynes obtains hydrogen alkynes ratio than the work output of PID control through control output verification as a result.
The method that the present invention controls with reactor outlet acetylene content complexity, through the conventional control of Reactor inlet hydrogen flow, the hydrogen amount of joining of automatic conditioned reaction device import, formed closed-loop control to reactor, improved controlling quality, guarantee the reactor outlet acetylene content do not transfinite (＜5ppm), and make the reactor outlet acetylene content by in the past 0 to 0.0166ppm, increase to 1 to 2ppm (in the actual production, be the safety meter, outlet acetylene artificial set(ting)value is not higher than 2ppm, and in fact artificial set(ting)value to reach 3ppm also be feasible), it all needs hydrogenation (as shown in Figure 3) by original three sections reactors, become first secondary hydrogenation, the 3rd section repeated hydrogenation has not significantly reduced the hydrogen amount of joining of reaction, and ethylene yield is largely increased.Prevented excessive hydrogen, the quality edge of joining effectively, received the raising product yield, the good result of energy-saving and cost-reducing and coordination optimization has been brought very big economic return.
The foregoing description only is used to illustrate the present invention, but not is used to limit the present invention.
Claims (6)
1. the control method of an acetylene content at exit of acetylene hydrogenation reactor, comprising, gather in real time the parameter surveyed of reactor, this can be surveyed parameter and is: Reactor inlet concentration of acetylene measured value, reactor outlet concentration of acetylene measured value and the artificial set(ting)value of reactor outlet concentration of acetylene;
With the input that the parameter surveyed that collects is controlled than PID as reactor outlet acetylene content hydrogen alkynes, the hydrogen amount of joining of automatic conditioned reaction device import;
This reactor outlet acetylene content hydrogen alkynes meets the following conditions than PID control law:
Δu(k)＝k′{kp1*{e(k)-e(k-1)}+(T
s/T
I)*e(k)}+kp2*e(k)`
Wherein:
Δ u (k): hydrogen flowing quantity and feed rate are used to control hydrogen flowing quantity than increment
E (k): the artificial set(ting)value of outlet alkynes and the difference of observed value
E (k) `: the measurement variation value of inlet alkynes
Kp1: feedback proportional coefficient
Kp2: feedforward scale-up factor
T
S: the sampling time
T
I: integral time
K ': transformation ratio changes into hydrogen flowing quantity and feed rate ratio with hydrogen alkynes mol ratio.
2. method according to claim 1 is characterized in that: described reactor outlet acetylene content hydrogen alkynes is output as than PID control: Reactor inlet is joined the mass ratio of hydrogen amount and inlet amount.
3. method according to claim 2 is characterized in that: the mass ratio that described Reactor inlet is joined hydrogen amount and inlet amount is meant, the mass ratio that this Reactor inlet is joined hydrogen amount and inlet amount obtains the hydrogen amount of joining of Reactor inlet after DCS handles.
4. method according to claim 3 is characterized in that: the hydrogen amount of joining of described Reactor inlet is meant that this is joined the hydrogen amount and implements control as the set-point of the conventional control of Reactor inlet hydrogen flow, automatically the hydrogen amount of joining of conditioned reaction device import.
5. according to claim 2 or 3 or 4 described methods, it is characterized in that: described hydrogen alkynes is meant than PID control, by the artificial set(ting)value of reactor outlet acetylene content and the difference of observed value, the variable quantity of Reactor inlet acetylene content, adopt feedback and feedforward means real-time closed-loop to adjust hydrogen alkynes ratio.
6. method according to claim 5 is characterized in that: described hydrogen alkynes is meant that than PID control hydrogen alkynes obtains hydrogen alkynes ratio than the work output of PID control through control output verification as a result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01144462 CN1199920C (en) | 2001-12-18 | 2001-12-18 | Control method of acetylene content at exit of acetylene hydrogenation reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01144462 CN1199920C (en) | 2001-12-18 | 2001-12-18 | Control method of acetylene content at exit of acetylene hydrogenation reactor |
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|---|---|
| CN1426985A CN1426985A (en) | 2003-07-02 |
| CN1199920C true CN1199920C (en) | 2005-05-04 |
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| CN 01144462 Expired - Fee Related CN1199920C (en) | 2001-12-18 | 2001-12-18 | Control method of acetylene content at exit of acetylene hydrogenation reactor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101315545B (en) * | 2008-06-27 | 2010-06-09 | 浙江大学 | Three-level charging-up system for hydrogenation station high-efficiency hydrogenation |
| CN107576373B (en) * | 2017-08-17 | 2020-06-30 | 浙江邦业科技股份有限公司 | Method for judging and correcting detection precision of feed gas flow of synthetic ammonia system |
| CN110775946B (en) * | 2018-07-30 | 2022-05-06 | 中国石油化工股份有限公司 | Method for post-treating working solution for producing hydrogen peroxide by anthraquinone process |
| CN114425273B (en) * | 2020-10-10 | 2022-11-18 | 中国石油化工股份有限公司 | Control method and application of carbo-hydrogenation reactor |
| CN114436748A (en) * | 2020-11-03 | 2022-05-06 | 中国石油化工股份有限公司 | Control method, control system and reaction system in liquid-phase selective hydrogenation reaction |
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