CN103880579B - The method and system of stopping in emergency of preparing propylene from methanol fixed bed reactors - Google Patents
The method and system of stopping in emergency of preparing propylene from methanol fixed bed reactors Download PDFInfo
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- CN103880579B CN103880579B CN201410108164.6A CN201410108164A CN103880579B CN 103880579 B CN103880579 B CN 103880579B CN 201410108164 A CN201410108164 A CN 201410108164A CN 103880579 B CN103880579 B CN 103880579B
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Abstract
The present invention relates to the method and system of stopping in emergency of preparing propylene from methanol fixed bed reactors.The method of stopping in emergency comprises the following steps：When the fixed bed reactors internal temperature is higher than the first design temperature or less than the second design temperature, stop injecting dimethyl ether to the fixed bed reactors, and to injection pressure water smoke in the fixed bed reactors with to carrying out cooling operation inside the fixed bed reactors, wherein, first design temperature is higher than second design temperature.The above-mentioned method of stopping in emergency of emergency stopping system application carries out operation of stopping in emergency.It is of the invention to stop in emergency method and emergency stopping system is avoided due to causing the waste of reaction gas using nitrogen, and need not move through torch treatment.
Description
Technical field
The present invention relates to chemical field, more particularly to preparing propylene from methanol fixed bed reactors stop in emergency method and methyl alcohol
The emergency stopping system of propylene fixed bed reactors processed.
Background technology
In the production process of methanol-to-olefins, it is necessary to assure preparing propylene from methanol（MTP）Fixed bed reactors temperature
A certain specific interval interior, it is to avoid cause catalyst choice reduction, excessive coke formation, protect above-mentioned fixed bed reactors and catalysis
Agent.The reaction of the preparing propylene from methanol is a highly exothermic reaction, and controlling reaction temperature is the weight that fixed bed reactors normally run
Ensure.When there is overtemperature or low temperature, selectivity reduction of the catalyst to propylene, the selectivity of methane is improved, when serious,
The rapid coking and deactivation of catalyst, even results in catalyst backbone dealuminzation, causes irrecoverability to damage.There is overtemperature or low temperature
Must take safety measures before makes fixed bed reactors stop in emergency.Existing safety system is used when stopping in emergency to solid
High pressure nitrogen scheme is filled with fixed bed reactor, one side nitrogen can make fixed bed reactors lower the temperature rapidly, another aspect nitrogen
Gas into reaction can be promoted after catalyst to stop, to protect fixed bed reactors and catalyst.But, after nitrogen is filled with, instead
Should gas（The gas containing materials such as methyl alcohol, dimethyl ether, hydro carbons in fixed bed reactors）A large amount of nitrogen are contained within, after should not entering
Face olefin separation system, by emptying to torch can only be used after chilling system.Thus, can waste substantial amounts of after stopping in emergency
Reaction gas, and need to be processed through torch, so as to improve production cost.Additionally, to by stopping in emergency to driving again, nitrogen need to be used
Gas replaces the reaction gas in fixed bed reactors completely.Complete driving pattern, i.e. steam displacement nitrogen, high-temperature steam are enabled again
It is standby, be passed through reaction gas driving.Thus, the time and step driven again are increased, and then increased production cost.
The content of the invention
It is anti-it is an object of the invention to provide a kind of fixed bed of preparing propylene from methanol for problem present in correlation technique
Stop in emergency method and a kind of emergency stopping system of preparing propylene from methanol fixed bed reactors of device are answered, it can be avoided due to making
The waste of reaction gas is caused with nitrogen, and needs not move through torch treatment.
To achieve the above object, one aspect of the present invention provides a kind of side of stopping in emergency of preparing propylene from methanol fixed bed reactors
Method, comprises the following steps：When fixed bed reactors internal temperature is higher than the first design temperature or less than the second design temperature, stop
Dimethyl ether only is injected to fixed bed reactors, and to injection pressure water smoke in fixed bed reactors with to fixed bed reactors inside
Cooling operation is carried out, wherein, the first design temperature is higher than the second design temperature.
According to the present invention, while pressure water smoke is injected, by fixed bed reactors top injection steam.
According to the present invention, also comprise the following steps：In cooling operating process is carried out, when fixed bed reactors internal temperature
During less than three design temperatures, stop injection pressure water smoke and reduce the flow of the steam injected by fixed bed reactors top,
Wherein, the 3rd design temperature is less than the second design temperature.
According to the present invention, the steam injection fixed bed reactors that will be introduced by fixed bed reactors side wall, when fixed bed is anti-
Device internal temperature is answered just to stop injection when being less than three design temperatures.
According to the present invention, in the range of 520 DEG C -550 DEG C, the second design temperature is at 350 DEG C -380 for the first design temperature
In the range of DEG C.
According to the present invention, in the range of 200 DEG C -250 DEG C, the temperature of the steam injected by top exists the 3rd design temperature
In the range of 200 DEG C -250 DEG C.
Another aspect of the present invention provides a kind of emergency stopping system of preparing propylene from methanol fixed bed reactors, and stopping in emergency is
System carries out operation of stopping in emergency using any of the above-described method.
According to the present invention, including：The temperature sensitive member of fixed bed reactors internal temperature is measured, when measured temperature is high
During in the first design temperature or less than the second design temperature, temperature sensitive member sends the first temperature signal；SIS systems, SIS systems
System sends first switch signal in response to the first temperature signal；The first pipeline and warp being communicated at the top of fixed bed reactors are solid
The side wall of fixed bed reactor is passed through the second pipeline inside fixed bed reactors；It is respectively arranged at the first pipeline and the second pipeline
First stop valve and the second stop valve, it is in response to first switch signal-off；It is arranged at the atomization inside fixed bed reactors
Device and the 3rd pipeline of press water is passed through to atomizer；The 3rd stop valve on the 3rd pipeline is arranged at, it is opened in response to first
OFF signal is opened.
According to the present invention, also include：The first pipeline is communicated in inject the 4th pipeline of the steam injected by the top
With the 4th stop valve being arranged on the 4th pipeline, the 4th stop valve is in response to the unlatching of first switch signal；At least one connection
The branch pipe at the top of the first pipeline and fixed bed reactors, and the branch pipe regulating valve being arranged on each branch pipe, wherein, temperature sense
When the measured temperature for answering element to measure is less than three design temperatures, temperature sensitive member sends second temperature signal, SIS systems
Second switch signal is sent in response to second temperature signal, the 3rd stop valve is in response to second switch signal-off, branch pipe regulation
Response valve reduces the flow of the steam at the top of injection fixed bed reactors in second switch signal.
Compared to prior art, beneficial effects of the present invention are：
1. method of stopping in emergency of the invention, when fixed bed reactors internal temperature is higher than the first design temperature or less than the
During two design temperatures, i.e., when fixed bed reactors internal temperature is too high or too low, stop injecting diformazan to fixed bed reactors
Ether, and carry out cooling operation with to fixed bed reactors inside to pressure water smoke is injected in fixed bed reactors.Thus, it is more existing
Technology uses nitrogen, and the present invention uses pressure water smoke, need not both be vented to torch, the purpose of cooling is can reach again, so as to save
About raw material, reduces the loss of reaction gas, reduces production cost.
2. method of stopping in emergency of the invention, after the cooling for completing steam and water smoke is operated, neatly to maintain fixed bed
Temperature in reactor, keeps standby.Thus steam displacement nitrogen steps are reduced, the energy has been saved and has been driven the time again, dropped
Low production cost.
3. the emergency stopping system application method of the present invention of the invention carries out operation of stopping in emergency, and can effectively save anti-
Should gas equal energy source, and effectively save the time, so as to reduce production cost.
Brief description of the drawings
Fig. 1 is the structure of one embodiment of the emergency stopping system of preparing propylene from methanol fixed bed reactors of the invention
Figure；
Fig. 2 is the flow of one embodiment of the method for stopping in emergency of preparing propylene from methanol fixed bed reactors of the invention
Figure.
Specific embodiment
The specific embodiment of the invention is described below in conjunction with the accompanying drawings.
The method of the present invention and system more particularly to during methanol production propylene, dimethyl ether is obtained by methanol production
Afterwards, the step of dimethyl ether generation propylene, thus, in the following description, the step of only relate to relevant dimethyl ether generation propylene, its
It is remaining same as the prior art the step of be not directed to, as well known to a person skilled in the art repeating no more.
Reference picture 1, a kind of one embodiment of the emergency stopping system of preparing propylene from methanol fixed bed reactors of the invention,
Including：The temperature sensitive member 15 that measures the internal temperature of fixed bed reactors 18 is, be communicated in the top of fixed bed reactors 18 the
One pipeline 21, the second pipeline 22 inside fixed bed reactors 18 is passed through through the side wall of fixed bed reactors 18, first is arranged at
First stop valve 1 of pipeline 21, the second stop valve 2 for being arranged at the second pipeline 22, it is arranged inside fixed bed reactors 18
Atomizer 19, the 3rd pipeline 23 that press water is passed through to atomizer 19 and the 3rd stop valve being arranged on the 3rd pipeline 23
3.Wherein, above-mentioned fixed bed reactors 18 are the fixed bed reactors of dimethyl ether propylene.
In the present embodiment, hot dimethyl ether is passed through by the first pipeline 21, cold dimethyl ether is passed through by the second pipeline 22.It is optional
Ground, the temperature of hot dimethyl ether is located in the range of 450 DEG C -490 DEG C, and the temperature of cold dimethyl ether is located at 230 DEG C -280 DEG C of model
In enclosing.Specifically, the top of the first pipeline 21 and fixed bed reactors 18 passes through the first branch pipe 211, the second branch pipe the 212, the 3rd
Branch pipe 213 is connected with the 4th branch pipe 214, i.e. the outlet of the first pipeline 21 connects the first branch pipe 211, the second branch pipe 212, the simultaneously
The entrance of three branch pipes 213 and the 4th branch pipe 214, and the first branch pipe 211, the second branch pipe 212, the 3rd branch pipe 213 and the 4th
The outlet of pipe 214 connects the top of fixed bed reactors 18 simultaneously.The first branch pipe 211 be provided with the first branch pipe regulating valve 11,
Be provided with the second branch pipe 212 second branch pipe regulating valve 12, be provided with the 3rd branch pipe 213 the 3rd branch pipe regulating valve 13,
The 4th branch pipe regulating valve 14 is provided with the 4th branch pipe 214.By the first branch pipe regulating valve 11, the second branch pipe regulating valve 12,
3rd branch pipe regulating valve 13 and the 4th branch pipe regulating valve 14 can adjust the flow of the hot dimethyl ether in each branch pipe.Certainly, above-mentioned four
Individual branch pipe is exemplary only, can be not provided with branch pipe（I.e. the first pipeline 21 is directly connected in the top of fixed bed reactors 18）Or
Person sets any number.
With further reference to Fig. 1, in fixed bed reactors 18, be parallel to each other from top to bottom be provided with beds
20, wherein, in the present embodiment, 4 beds 20 are set.For convenience of description, the 4 catalyst layers bed in the present embodiment
In, respectively first catalyst layer bed, second catalyst layer bed, the 3rd catalyst layer bed and the 4th urge from top to bottom
Agent layer bed.Also, the second pipeline 22 includes the 5th branch pipe 221, the 6th branch pipe 222, the 7th branch pipe 223, the 5th branch pipe 221,
6th branch pipe 222, the 7th branch pipe 223 are passed through inside fixed bed reactors by the side wall of fixed bed reactors respectively, and herein three
The pipeline section that individual branch pipe is located in fixed bed reactors 18 sets nozzle, and the 5th branch pipe 221 is located at the 2nd beds top,
6th branch pipe 222 is located at the 3rd beds top, and the 7th branch pipe 223 is located at the 4th beds top.Thus, it is cold
Dimethyl ether is sprayed at the catalyst bed below each of which by the 5th branch pipe 221, the 6th branch pipe 222, the 7th branch pipe 223
On layer.Additionally, being provided with the 5th branch pipe regulating valve 5 in the 5th branch pipe 221, the 6th branch pipe 222 is provided with the 6th branch pipe regulating valve
6th, the 7th branch pipe 223 is provided with the 7th branch pipe regulating valve 7.Thus, can be by the 5th branch pipe regulating valve 5, the 6th branch pipe regulating valve 6
Adjust the stream of the cold dimethyl ether in the 5th branch pipe 221, the 6th branch pipe 222 and the 7th branch pipe 223 respectively with the 7th branch pipe regulating valve 7
Amount.It is understood that the second stop valve 2 controls the break-make of cold dimethyl ether, i.e. open the second stop valve 2, cold dimethyl ether can send into fixation
In bed reactor, the second stop valve 2 is closed, stopped in cold dimethyl ether feeding fixed bed reactors.First stop valve 1 controls heat
The break-make of dimethyl ether, i.e. open the first stop valve 1, hot dimethyl ether can be sent into fixed bed reactors, close the first stop valve 1,
Stop in hot dimethyl ether feeding fixed bed reactors.
To sum up, it is appreciated that carrying out dimethyl ether production propylene step using the fixed bed reactors of the present embodiment is, first
Pipe 211, the second branch pipe 212, the 3rd branch pipe 213 and the 4th branch pipe 214 are from the top of fixed bed reactors 18 to fixed bed reaction
The inside of device 18 sprays into hot dimethyl ether, and hot dimethyl ether carries out exothermic reaction on first beds, and reacts the third of generation
Alkene and remaining dimethyl ether flow downward, to second beds, now due to reaction has been carried out, so above-mentioned third
The temperature of alkene and remaining dimethyl ether is raised before relatively reacting.Cold dimethyl ether is filled into second beds, is mended with one side
Enter unstripped gas（That is dimethyl ether）, on the other hand play cooling-down effect.The like, until being discharged by the bottom of fixed bed reactors 18
Reaction generation gas（Propylene, unreacted dimethyl ether etc.）.The direction that reaction generation gas is discharged is injected into by hot dimethyl ether（Fixed bed
The direction of the top-to-bottom of reactor）It is direction from top to bottom.
Further, reference picture 1, is additionally provided with the 5th pipeline 25, to injecting steam in the 5th pipeline 25.5th pipeline 25 is wrapped
Include the 8th branch pipe 251, the 9th branch pipe 252, the tenth branch pipe 253.Specifically, the 8th branch pipe 251 is connected with the 5th branch pipe 221, the
After steam in eight branch pipes 251 enters the 5th branch pipe 221, fixed bed is entered together with the cold dimethyl ether in the 5th branch pipe 221 anti-
Answer inside device, and spray to second beds.Above-mentioned steam plays a part of cooling.It is understood that similarly, the 9th branch pipe
252 connect with the 6th branch pipe 222, the steam in the 9th branch pipe 252 enter the 6th branch pipe 222 after, with the 6th branch pipe 222 in it is cold
Dimethyl ether enters inside fixed bed reactors together；Tenth branch pipe 253 is connected with the 7th branch pipe 223, the steaming in the tenth branch pipe 253
After vapour enters the 7th branch pipe 223, enter inside fixed bed reactors together with the cold dimethyl ether in the 7th branch pipe 223.Additionally,
8th branch pipe 251 sets the 8th branch pipe regulating valve 8, and the 9th branch pipe regulating valve 9 is set on the 9th branch pipe 252, and the tenth branch pipe 253 sets
Put the tenth branch pipe regulating valve 10.Thus, can respectively adjust and be flowed into by the 8th branch pipe 251, the 9th branch pipe 252, the tenth branch pipe 253
The flow of the steam in fixed bed reactors 18, also may control whether for above-mentioned steam to send into fixed bed reactors 18.It is understood that
By the 8th branch pipe 251, the 9th branch pipe 252, the tenth branch pipe 253 of the 5th pipeline 25 respectively with the 5th branch pipe 221, the 6th branch pipe
222nd, the 3rd branch pipe 223 is connected, to realize introducing steam by the side wall of fixed bed reactors, to reach the effect of cooling.When
So, the present embodiment is not limited to, also the 8th branch pipe 251, the 9th branch pipe 252, the tenth branch pipe 253 fixed bed can be directly communicated to
Nozzle is set in reactor, and on pipeline section in its each comfortable fixed bed reactors.Certainly, also dependent on fixed bed reactors
Cooling demand set, be not limited to the set location in the present embodiment.
With continued reference to Fig. 1, the emergency stopping system of the present embodiment also includes being communicated in the top of fixed bed reactors 18 to note
Enter the 4th pipeline 24 and the 4th stop valve 4 being arranged on the 4th pipeline 24 of steam.In the present embodiment, the 4th pipeline 24 connects
The first pipeline 21 is passed through to inject steam, i.e. steam in the 4th pipeline 24 enters the first pipeline 21, and through the first branch pipe 211,
Second branch pipe 212, the 3rd branch pipe 213 and the 4th branch pipe 214 are entered into fixed bed reactors, thus achieve the 4th pipeline 24
With the connection at the top of fixed bed reactors, and by the top inject steam to realize cooling effect, especially for fixed bed
Cooling in reactor head and for first cooling of beds.
Additionally, as shown in Figure 1, also including the atomizer 19 that is arranged inside fixed bed reactors 18 and to atomizer 19
It is passed through the 3rd pipeline 23 of press water.In other words, in the entrance of atomizer 19, press water is through for the outlet of the 3rd pipeline 23
Three pipelines 23 are passed through atomizer 19, and form pressure water smoke to ejection inside fixed bed reactors 18 by atomizer 19.Thus,
Reduce the internal temperature of fixed bed reactors 18.And the 3rd stop valve 3 is provided with the 3rd pipeline 23, to adjust the 3rd pipeline 23
Into the flow of the press water of atomizer 19, and control pressure water injection.Wherein, the pressure limit of pressure water smoke is
0.5-1.5MPaG.
In the present embodiment, the 3rd pipeline 23 includes supervisor and the 11st branch pipe 231, that are connected to supervisor's outlet
Twelve earthly branches pipe 232, the 13rd branch pipe 233 and the 14th branch pipe 234, and the outlet of the 11st branch pipe 231 has a mist
Change device 19, and the atomizer 19 is located at first beds top；The outlet of twelve earthly branches pipe 232 has an atomization
Device 19, and the atomizer 19 is located at second beds top；The outlet of the 13rd branch pipe 233 has an atomizer
19, and the atomizer 19 is located at the 3rd beds top；And the outlet of the 14th branch pipe 234 has an atomization
Device 19, and the atomizer 19 is located at the 4th beds top.Thus, can emphatically for each beds 20 drops
Temperature.It is understood that the change of the number according to beds, the branch pipe number change that the 3rd pipeline 23 is included, it is preferable that every
The top of individual beds sets an atomizer 19, and the atomizer 19 is connected with a branch pipe of the 3rd pipeline 23.
Certainly, atomizer and the 3rd pipeline can be set according to the cooling demand of different fixed bed reactors, is not limited to this embodiment.
Additionally, setting the temperature sensitive member 15 of the measurement internal temperature of fixed bed reactors 18 on fixed bed reactors 18
With SIS systems（Safety interlocking instrument system）.Alternatively, 3 temperature sensitive members 15 are from top to bottom set in the present embodiment,
Wherein, each temperature sensitive member 15 measures the internal temperature of fixed bed reactors 18, and when measured temperature sets higher than first
Constant temperature degree or during less than the second design temperature, sends the first temperature signal.It is understood that 3 measurements of temperature sensitive member 15 are fixed
The internal temperature of the bed diverse location of reactor 18, when the internal temperature of one of position is higher than the first design temperature or less than the
During two design temperatures, the temperature sensitive member 15 of relevant position will send the first temperature signal.When measured temperature be less than or
Equal to the first design temperature and when measured temperature is greater than or equal to the second design temperature, the first temperature signal is not sent.
SIS systems send first switch signal in response to temperature sensitive member 15, i.e. in the present embodiment, and SIS systems are only
The first temperature signal that a temperature sensitive member 15 in 3 temperature sensitive members 15 sends is received, will be sent
One switching signal.
First stop valve 1 and the second stop valve 2 are in response to first switch signal-off.Now, cold dimethyl ether and hot diformazan
Ether stops in feeding fixed bed reactors 18.And the 8th branch pipe regulating valve 8, the 9th branch pipe regulating valve 9, the tenth branch pipe regulating valve 10
First switch signalizing activity is not responsive to, that is, is maintained at production process（To addition dimethyl ether propylene in fixed bed reactors
Process）From the 5th branch pipe 221, the 6th branch pipe 222 and the 7th branch pipe 223 to injecting steam inside fixed bed reactors 18, with after
It is continuous to play cooling effect using this some vapor.Additionally, the 3rd stop valve 3 is opened in response to first switch signal, that is, start to lead to
The 3rd pipeline 23 is crossed to being passed through press water inside fixed bed reactors 18, and is sprayed in the form of pressure water smoke after atomizer 19
Go out, so as to play cooling effect.Especially, the press water after atomization has bigger surface area, and can absorb heat evaporation faster,
Preferably to reduce temperature.In addition, the 4th stop valve 4 is opened in response to first switch signal, that is, start to fixed bed reactors
Top is passed through steam, to play cooling effect.It is understood that aforesaid operations（To injecting pressure water smoke in fixed bed reactors, by solid
The top of fixed bed reactor and side wall introduce steam）It is the cooling operation to fixed bed reactors.First design temperature is higher than the
Two design temperatures, i.e. when the internal temperature of fixed bed reactors is higher than the first design temperature, illustrate that fixed bed reactors occur
Overheating problem, when the internal temperature of fixed bed reactors is less than the second design temperature, illustrates that fixed bed reactors occur low temperature
Phenomenon.Now, it is required to stop in emergency.Thus, on the one hand above-mentioned emergency stopping system can effectively save reaction gas equal energy source,
And effectively save the time, so as to reduce production cost.
And the internal temperature for working as fixed bed reactors 18 is gradually reduced, until in 3 temperature sensitive members 15 wherein one
When individual temperature sensitive member 15 detects the internal temperature of fixed bed reactors 18 less than three design temperatures, the temperature sensitive member
15 send second temperature signal, and SIS systems send second switch signal in response to second temperature signal.3rd stop valve 3 is responded
In second switch signal-off, that is, stop to injection pressure water smoke in fixed bed reactors 18.8th branch pipe regulating valve the 8, the 9th
The branch pipe regulating valve 10 of branch pipe regulating valve 9 and the tenth stops from the 5th pipeline 25 to fixation in response to second switch signal-off
Steam is injected in bed reactor 18.First branch pipe regulating valve 11, the second branch pipe regulating valve 12, the 3rd branch pipe regulating valve 13 and the 4th
Branch pipe regulating valve 14 reduces the flow of the steam at the top of injection fixed bed reactors 18 in response to second switch signal, you can choosing
Ground, the first branch pipe regulating valve 11 reduces the flow of the steam that fixed bed reactors 18 are injected by the first branch pipe 211, and the second branch pipe is adjusted
Section valve 12 reduces the flow of the steam that fixed bed reactors 18 are injected by the second branch pipe 212, the 3rd branch pipe regulating valve 13 reduce by
The flow of the steam of the injection fixed bed reactors 18 of the 3rd branch pipe 213, the 4th branch pipe regulating valve 14 reduces by the note of the 4th branch pipe 214
Enter the flow of the steam of fixed bed reactors 18.Preferably, the flow of the steam in above-mentioned each branch pipe is decreased to cooling operation
In flow 10%~30%.
Thus, the temperature of fixed bed reactors can be maintained by keeping the steam by being injected at the top of fixed bed reactors, with
Made an appointment in the time of driving again.It is greater than or equal to when the internal temperature of fixed bed reactors 18 is detected in temperature sensitive member 15
During three design temperatures, second switch signal is not sent.
Alternatively, the 5th branch pipe regulating valve 5, the 6th branch pipe regulating valve 6, the 7th branch pipe regulating valve 7 response second switch letter
Number close.Thus, after driving again, the injection of cold dimethyl ether can selectively be controlled.
Further optionally, safety interlocking instrument system（SIS systems）Operated more specifically, worked as fixed bed reaction
When temperature is higher than the first design temperature or less than the second design temperature in device, SIS systems are triggered in response to the first temperature signal, defeated
Go out first switch signal, the 5th branch pipe regulating valve 5, the 6th branch pipe regulating valve 6, the 7th branch pipe regulating valve 7 response first switch letter
Switch to artificial mode after number.When temperature is less than three design temperatures in fixed bed reactors, SIS systems are in response to second switch
Signal output second switch signal, switchs to after the 8th branch pipe regulating valve 8, the 9th branch pipe regulating valve 9 and the tenth branch pipe regulating valve 10
Artificial mode.
Reference picture 2, describes one embodiment of the method for stopping in emergency of preparing propylene from methanol fixed bed reactors of the invention.
In the production process for preparing propylene from methanol, the production method of the fixed bed reactors of dimethyl ether propylene is：
To dimethyl ether is passed through in fixed bed reactors, in the presence of catalyst, there is exothermic reaction and produce propylene.Alternatively, it is catalyzed
Agent is arranged on the beds in fixed bed reactors.And alternatively, in process of production, by fixed bed reactors top
Hot dimethyl ether is injected in portion, and cold dimethyl ether is introduced by fixed bed reactors side wall.
Measurement fixed bed reactors internal temperature, when fixed bed reactors internal temperature is higher than the first design temperature or is less than
During the second design temperature, stop injecting dimethyl ether to fixed bed reactors（In the present embodiment, the cold dimethyl ether of injection and heat are stopped
Dimethyl ether）, and cooling operation is carried out with to fixed bed reactors inside to pressure water smoke is injected in fixed bed reactors, wherein,
First design temperature is higher than the second design temperature, i.e., when fixed bed reactors internal temperature is too high or too low, stop to fixation
Bed reactor injection dimethyl ether, and lower the temperature with to fixed bed reactors inside to pressure water smoke is injected in fixed bed reactors
Operation.Thus, nitrogen is used compared with prior art, the present invention uses pressure water smoke, need not both be vented to torch, and drop is can reach again
The purpose of temperature, so as to save raw material, reduces the loss of reaction gas, reduces production cost.Inside fixed bed reactors
Temperature keeps above-mentioned production process less than or equal to the first design temperature and during greater than or equal to the second design temperature, that is, carry out
The step of by dimethyl ether propylene.
Preferably, the top of the beds in each fixed bed reactors sets atomizer, to there is be directed to right
Each beds is lowered the temperature, so as to realize uniformly and effectively lowering the temperature.
Additionally, while pressure water smoke is injected, by fixed bed reactors top injection steam, with further more uniform
Effectively fixed bed reactors inside is lowered the temperature.
In above-mentioned cooling operating process is carried out, i.e., to steam in fixed bed reactors and pressure water smoke during, when
When fixed bed reactors internal temperature is less than three design temperatures, stops injection pressure water smoke and reduce by fixed bed reactors top
The flow of the steam of portion's injection, wherein, the 3rd design temperature is less than the second design temperature.Preferably, by the flow of above-mentioned steam
The 10%~30% of the flow being decreased in cooling operation.When fixed bed reactors internal temperature is less than three design temperatures,
Through the purpose for having reached cooling.Stop injection pressure water smoke and reduce the stream of the steam injected by fixed bed reactors top
Amount, can keep fixed bed reactors internal temperature to maintain the temperature of the steam injected by top, thus, when driving again,
Fixed bed reactors internal temperature is improved on the basis of this temperature, the time driven again is reduced.When in fixed bed reactors
When portion's temperature is greater than or equal to three design temperature, continue above-mentioned cooling operation.
In addition, in the present embodiment, in the course of reaction of dimethyl ether propylene, being introduced by fixed bed reactors side wall
Steam injects fixed bed reactors, alternatively, injection is mixed together with the cold dimethyl ether introduced by fixed bed reactors side wall, with
Cooling effect is realized in above-mentioned course of reaction.Just stop note when fixed bed reactors internal temperature is less than three design temperatures
Enter, i.e., in above-mentioned temperature-fall period（To injection pressure water smoke in fixed bed reactors and by fixed bed reactors top injection steam
Process）The steam for being introduced by fixed bed reactors side wall during the course of the reaction is kept persistently to inject, to improve cooling-down effect.And
When fixed bed reactors internal temperature is less than three design temperatures, stopping is drawn by fixed bed reactors side wall during the course of the reaction
The steam injection for entering, the steam for only keeping the above-mentioned top by fixed bed reactors to inject injects.
In the embodiment of the above method and the embodiment of device, the first design temperature in the range of 520 DEG C -550 DEG C,
Second design temperature in the range of 350 DEG C -380 DEG C, the 3rd design temperature in the range of 200 DEG C -250 DEG C, by fixed bed
The temperature of the steam of reactor head injection is in the range of 200 DEG C -250 DEG C.
Also, in the present embodiment, pressure water smoke is generated by press water through atomizer, and press water is process water, and steam is
Process steam.
With reference to one embodiment and the one embodiment for method of stopping in emergency of the emergency stopping system of the invention described above, can
Understand, method carries out operation of stopping in emergency in above-mentioned emergency stopping system application.
It is understood, of course, that, it is of the invention to stop in emergency method and emergency stopping system can be not only used for dimethyl ether production propylene,
The fixed bed reactors of other many beds similar therewith are can also be used for, within the scope of the present invention.
The preferred embodiments of the present invention are these are only, is not intended to limit the invention, for those skilled in the art
For member, the present invention can have various modifications and variations.All any modifications within the spirit and principles in the present invention, made,
Equivalent, improvement etc., should be included within the scope of the present invention.
Claims (4)
1. a kind of method of stopping in emergency of preparing propylene from methanol fixed bed reactors, it is characterised in that comprise the following steps：
When the fixed bed reactors internal temperature is higher than the first design temperature or less than the second design temperature, stop to described
Fixed bed reactors inject dimethyl ether, and to injection pressure water smoke in the fixed bed reactors with to the fixed bed reactors
Inside carries out cooling operation, wherein, first design temperature is higher than second design temperature；
Wherein, after the cooling for completing steam and water smoke is operated, the temperature in the fixed bed reactors is maintained with steam, to subtract
Few steam displacement nitrogen steps；
Wherein, while the pressure water smoke is injected, by fixed bed reactors top injection steam；
In the cooling operating process is carried out, when the fixed bed reactors internal temperature is less than three design temperatures, stop
Only inject the pressure water smoke and reduce the flow of the steam injected by fixed bed reactors top, wherein, the described 3rd
Design temperature is less than second design temperature；
Wherein, the steam that will be introduced by fixed bed reactors side wall injects the fixed bed reactors, when the fixed bed
Inside reactor temperature just stops the injection when being less than three design temperature.
2. method of stopping in emergency according to claim 1, it is characterised in that
First design temperature in the range of 520 DEG C -550 DEG C, scope of second design temperature at 350 DEG C -380 DEG C
It is interior.
3. method of stopping in emergency according to claim 1, it is characterised in that
3rd design temperature in the range of 200 DEG C -250 DEG C, the temperature of the steam injected by the top 200 DEG C -
In the range of 250 DEG C.
4. a kind of emergency stop (apparatus) of preparing propylene from methanol fixed bed reactors, it is characterised in that including：
The temperature sensitive member (15) of the fixed bed reactors (18) internal temperature is measured, when measured temperature sets higher than first
Constant temperature degree or during less than the second design temperature, the temperature sensitive member (15) sends the first temperature signal；
Safety interlocking instrument system, the safety interlocking instrument system sends first switch in response to first temperature signal
Signal；
The first pipeline (21) for being communicated at the top of the fixed bed reactors (18) and lead to through the side wall of fixed bed reactors (18)
Enter internal the second pipeline (22) of fixed bed reactors (18)；
It is respectively arranged at first stop valve (1) and the second stop valve of first pipeline (21) and second pipeline (22)
(2), it is in response to the first switch signal-off；
It is arranged at the internal atomizer (19) of the fixed bed reactors (18) and is passed through press water to the atomizer (19)
3rd pipeline (23)；
The 3rd stop valve (3) on the 3rd pipeline (23) is arranged at, it is opened in response to the first switch signal；
Wherein, first pipeline (21) is communicated in inject the 4th pipeline (24) of the steam injected by the top and set
The 4th stop valve (4) on the 4th pipeline (24), the 4th stop valve (4) is opened in response to the first switch signal
Open；
The branch pipe at least one top for connecting first pipeline (21) and the fixed bed reactors (18), and be arranged on every
Branch pipe regulating valve on the individual branch pipe,
Wherein, when the measured temperature that the temperature sensitive member (15) measures is less than three design temperatures, the temperature sense
Element (15) sends second temperature signal, and the safety interlocking instrument system sends second and opens in response to the second temperature signal
OFF signal, in response to the second switch signal-off, the branch pipe regulating valve is in response to described for the 3rd stop valve (3)
Two switching signals reduce the flow of the steam at the top of the injection fixed bed reactors (18).
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| CN1356299A (en) * | 2001-12-14 | 2002-07-03 | 清华大学 | Process and system for preparing low-carbon olefin from methanol or dimethylether |
| CN102276394A (en) * | 2010-06-11 | 2011-12-14 | 中国石油化工股份有限公司 | Method of stopping for unloading when cutting reactor-regeneration system in process of preparing olefins from methanol |
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| CN101869819B (en) * | 2010-06-18 | 2014-12-03 | 王伟跃 | Reactor for preparing propylene from oxygen-containing compound |
| CN202844982U (en) * | 2012-09-06 | 2013-04-03 | 渭南高新区爱心有限责任公司 | Reactor for preparing low-carbon olefin by dimethyl ether or mixture of dimethyl ether and methyl alcohol |
| CN103611477B (en) * | 2013-11-23 | 2016-08-17 | 中国石油集团东北炼化工程有限公司吉林设计院 | The control system of preparing propylene from methanol reactor |
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| CN1356299A (en) * | 2001-12-14 | 2002-07-03 | 清华大学 | Process and system for preparing low-carbon olefin from methanol or dimethylether |
| CN102276394A (en) * | 2010-06-11 | 2011-12-14 | 中国石油化工股份有限公司 | Method of stopping for unloading when cutting reactor-regeneration system in process of preparing olefins from methanol |
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