CN110240666A - The load adjustment method and system of high-pressure polyethylene device - Google Patents
The load adjustment method and system of high-pressure polyethylene device Download PDFInfo
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Abstract
The present invention relates to manufacture of polyolefins fields, disclose a kind of load adjustment method and system of high-pressure polyethylene device, wherein load adjustment method includes: to judge whether the storage capacity of reaction mass meets tank and deposit requirement, if so, not adjusted to the load of high-pressure polyethylene device；If the storage capacity of reaction mass is unsatisfactory for tank and deposits standard, it then takes load up or load down to operate the high-pressure polyethylene device, increases or decreases polymerization reaction load including adjusting at least one reaction condition in reaction pressure, reacting initial temperature, reaction peak temperature, the heat transferring medium temperature difference and initiator additive amount.The adjusting range of polymerization reaction load is expanded, the Load Regulation ability of polyethylene device is enhanced by one or more reaction conditions in control polymerization process using method provided by the invention.
Description
Technical field
The present invention relates to manufacture of polyolefins fields, and in particular to the load adjustment method and system of high-pressure polyethylene device.
Background technique
Ethylene is polymerize under high temperature, condition of high voltage by radical reaction mechanism, and macromolecular chain transfer reaction occurs, raw
At the linear macromolecule for having more long-chain branch and short-chain branch, so that polymerizate crystallinity is low, density is small, therefore high pressure polyethylene
Also referred to as low density polyethylene (LDPE).
Hp-ldpe product is because its density is low, and the transparency, lower temperature resistance and the advantages that good insulating are extensive
For the production of agricultural film (canopy film, mulch), multilayer packing membrane, shrink film, hyaline membrane and Insulation Material and cable cover(ing), it is also used to infuse
The manufacture fields such as modeling, extruding, foaming.In the process flow of polyethylene production, with the ethylene producing device of upstream (such as ethylene
Cracker or coal chemical industry MTO device etc.) ethylene sent is raw material, polyethylene production device (such as high pressure low density in downstream
Polyethylene device) by ethylene be pressurized to reaction needed for pressure after, be transported in reactor, with organic peroxide be cause
Agent is polymerize under conditions of high temperature and pressure, obtains polyethylene.
According to the process characteristic that high pressure polymerisation reacts, when reaction temperature, reaction pressure and reciprocating raw material compressor are beaten
When tolerance is constant, polymerization reaction load is remained unchanged, and the product grade of polyethylene device only corresponds to a kind of Design cooling load.Work as upstream
Device when causing its produce load to change because of maintenance or practical operation adjustment, the device in downstream can not keep up with upstream because of its load
Load variations, the ethylene for being easy to appear upstream conveying can not excessively consume or ethylene storage is very few that high-pressure installation is caused to be forced
Reduce load even situations such as holding up work for lack of material, cause upstream and downstream material unbalance, to reduce production efficiency, increase material consumption,
Energy consumption, and then influence the economic benefit of enterprise.
Accordingly, it is desirable to provide a kind of load adjustment method of polyethylene device, to solve the load tune because of polyethylene device
Adjusting range is narrow to cause that upstream and downstream material is unbalance, produces the technical issues of inefficient and increased costs.
Summary of the invention
It is of the existing technology because the load regulation range of polyethylene device is narrow easy the purpose of the invention is to overcome
The technical issues of causing unbalance upstream and downstream material, production inefficient and increased costs, provides a kind of bearing for high-pressure polyethylene device
Lotus method of adjustment and system.
To achieve the goals above, first aspect present invention provides a kind of load adjustment method of high-pressure polyethylene device,
The described method includes:
Judge whether the storage capacity of reaction mass meets tank and deposit requirement, if so, not adjusting to the load of high pressure alkene device
It is whole；
If the storage capacity of reaction mass is more than that most tall can deposits standard, load up is taken to grasp the high-pressure polyethylene device
Make, including adjusts reaction pressure, reacting initial temperature, reaction at least one of peak temperature and the heat transferring medium temperature difference reaction item
Part improves polymerization reaction load；
If the storage capacity of reaction mass deposits standard lower than minimum tank, load down is taken to grasp the high-pressure polyethylene device
Make, including adjusting in reaction pressure, reacting initial temperature, reaction peak temperature, the heat transferring medium temperature difference and initiator additive amount
At least one reaction condition reduces polymerization reaction load.
Preferably, the reaction mass is preheated before polymerization reaction occurs, in load up operation, adjusts reaction starting
The operation of temperature includes: 160-165 DEG C of temperature after preheating the reaction mass.
Preferably, in load up operation, the operation for adjusting reaction pressure includes: to keep the inlet temperature of compressor not
When change, the inlet pressure for adjusting compressor is 26-30MPa.
Preferably, in load up operation, the operation for adjusting reaction peak temperature includes: to adjust the reaction of inside reactor
Peak temperature is 304-308 DEG C.
Preferably, the outside of reactor is provided with heat exchange jacket, and the inner wall temperature of the reactor is by the heat exchange jacket
In heat transferring medium regulate and control, wherein in load up operation, the operation for adjusting the heat transferring medium temperature difference includes: will be described
The heat transferring medium temperature difference control of reactor entrance is 10-15 DEG C.
Preferably, in load down operation, the operation for adjusting reaction pressure includes: to keep the inlet pressure of compressor not
When change, the inlet temperature for adjusting compressor is 40-45 DEG C.
Preferably, in load down operation, the operation for adjusting reacting initial temperature includes: after preheating the reaction mass
Temperature be 165-170 DEG C.
Preferably, in load down operation, the operation for adjusting reaction peak temperature includes: to adjust the reaction of inside reactor
Peak temperature is 298-302 DEG C.
Preferably, in load down operation, the operation for adjusting the heat transferring medium temperature difference includes: by the reactor entrance
The control of the heat transferring medium temperature difference is 15-20 DEG C.
Preferably, the reactor of the high-pressure polyethylene device includes four reaction areas, and in load down operation, adjusting is drawn
The operation of hair agent additive amount includes: to stop adding initiator into the 4th reaction zone.
Second aspect of the present invention provides a kind of load adjustment system of high-pressure polyethylene device, the system comprises:
Judging unit deposits requirement for judging whether the storage capacity of reaction mass meets tank；
By-pass unit, when most tall can deposits standard to the storage capacity of reaction mass satisfaction, for taking bypass operation, not to height
The load of pressure polyethylene device adjusts；
Load processing unit, when the storage capacity of reaction mass, which is unsatisfactory for tank, deposits standard, for high-pressure polyethylene device
It takes load up or load down to operate, including adjusts reaction pressure, reacting initial temperature, reaction peak temperature, heat transferring medium temperature
Difference increases or decreases polymerization reaction load at least one reaction condition in initiator additive amount.
Preferably, the load processing unit includes:
Reaction pressure adjusts unit, for adjusting the entrance pressure of compressor when the inlet temperature for keeping compressor is constant
Power is 26-30MPa to improve polymerization reaction load；
And/or initial temperature adjusts unit, for adjust the temperature after reaction mass preheating be 160-165 DEG C with
Improve polymerization reaction load；
And/or peak temperature adjust unit, for adjust inside reactor reaction peak temperature be 304-308 DEG C with
Improve polymerization reaction load；
And/or heat transferring medium adjusts unit, for controlling the heat transferring medium temperature difference of the reactor entrance for 10-
15 DEG C to improve polymerization reaction load.
Preferably, the reaction pressure adjusts unit and is also used to keeping the inlet pressure of compressor constant constantly, adjusts
The inlet temperature of compressor is 40-45 DEG C to reduce polymerization reaction load；
It is 165-170 DEG C with drop that the initial temperature, which adjusts the temperature that unit is also used to adjust after the reaction mass preheating,
Oligomerizing load；
It is 298-302 DEG C with drop that the peak temperature, which adjusts unit and is also used to adjust the reaction peak temperature of inside reactor,
Oligomerizing load；
The heat transferring medium adjusts unit and is also used to control the heat transferring medium temperature difference of the reactor entrance for 15-20
DEG C to reduce polymerization reaction load；
Preferably, the load processing unit further includes that polymerization reaction adjusts unit, for stopping into the 4th reaction zone
Initiator is added to reduce polymerization reaction load.
Using above-mentioned technical proposal, on the basis of existing high-pressure polyethylene device, by controlling polymerization process
In one or more reaction conditions, expand the polymerization reaction load range of reactor, enhance polyethylene device
Load Regulation ability avoids upstream and downstream material unbalance, to improve production efficiency, reduce production cost.
Detailed description of the invention
Fig. 1 is the flow diagram of the load adjustment method of high-pressure polyethylene device provided by the invention；
Fig. 2 is the structural schematic diagram of the load adjustment system of high-pressure polyethylene device provided by the invention.
Description of symbols
As shown in Fig. 2, 1- judging unit；2- by-pass unit；3- load processing unit；30- reaction pressure adjusts unit；
31- initial temperature adjusts unit；32- peak temperature adjusts unit；33- heat transferring medium adjusts unit；34- polymerization reaction adjusts single
Member.
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
In practical applications, when the storage capacity of reaction mass ethylene not limit range in when, such as it is over proof most
Tall can storage or be lower than minimum tank storage when, can by adjusting the load of ethylene producing device or the load of polyethylene device,
Reach upstream and downstream material balance.Mainly elaborate how to adjust the load of polyethylene device in the present invention.
As shown in Figure 1, the present invention provides a kind of load adjustment methods of high-pressure polyethylene device, this method comprises:
100, judge whether the storage capacity of reaction mass meets tank and deposit requirement；
200, if so, not adjusted to the load of high pressure alkene device；
If 300, the storage capacity of reaction mass is more than that most tall can deposits standard, the high-pressure polyethylene device is taken to rise and is born
At least one of lotus operation, including adjusting reaction pressure, reacting initial temperature, reaction peak temperature, the heat transferring medium temperature difference are anti-
Condition is answered to improve polymerization reaction load；
If 400, the storage capacity of reaction mass deposits standard lower than minimum tank, take drop negative the high-pressure polyethylene device
Lotus operation, including adjust reaction pressure, reacting initial temperature, reaction peak temperature, the heat transferring medium temperature difference and initiator additive amount
In at least one reaction condition reduce polymerization reaction load.
High-pressure polyethylene device is mainly made of compression, polymerization, separation and pelletizing unit, it is preferable that in the present invention, is gathered
The reactor of ethylene unit includes four reaction areas, and according to reaction process, reaction mass initially enters the first reaction zone, first
The polymerizate and unreacted material reacted in reaction zone enters back into second reaction zone that the reaction was continued, and so on,
Until flowing out final polymerizate polyethylene from the 4th reaction zone.
In polyethylene device, pressure needed for reaction mass ethylene is pressurized to polymerization reaction through compressor, using pre-
Hot step enters reactor after reaching initiation temperature, is then induced into conversion zone by the initiator added in reactor.According to
A kind of preferred embodiment of the present invention, the tubular reactor of polyethylene device includes four reaction areas, wherein each reaction zone
Inlet be provided with initiator pump, initiator pump is used for continuously injecting configured initiator solution into reaction zone
High pressure polymerisation reaction is carried out in reaction zone in causing material, and Raolical polymerizable occurs in reaction process and discharges reaction
Heat, the temperature of inside reactor, which is gradually increasing, reaches peak value, and the reaction heat generated in polymerization process is removed by heat-exchange system
Out, also, as the decomposition and consumption of initiator, the conversion ratio of ethylene reduce, reaction temperature is gradually reduced.Therefore, in reactor
The temperature in portion gradually changes with the initiation of reaction, polymerization, termination procedure and heat transfer, therefore in a reactor
Temperature is showed from trough to wave crest again to the variation of trough.
According to the process characteristic that high pressure polymerisation reacts, when reaching the reaction condition of setting, polyethylene reactor is being designed
Operation and polymerization reaction load constant under operating condition.Specifically, polymeric reaction condition includes reaction pressure, polymerization reaction starting temperature
Degree, reaction peak temperature, the heat transferring medium temperature difference and initiator etc., by individually one reaction zone of control or together in the present invention program
Step controls several reaction conditions of multiple reaction zones, achievees the purpose that the integral load for adjusting polyethylene device.
It, can be by adjusting reaction pressure, reaction starting under design conditions when high-pressure polyethylene device needs load up
Temperature reacts peak temperature or the heat transferring medium temperature difference to achieve the goal, also, the combination implementation method of aforesaid operations can different journeys
Improve polymerization reaction load in degree ground.
In the present invention, reaction mass ethylene is by entering reactor after compressor boost, by the entrance for adjusting compressor
Pressure or inlet temperature adjust the density of ethylene gas in reactor.According to a kind of preferred embodiment, grasped in load up
When making, the operation for adjusting reaction pressure includes proposing the inlet pressure of compressor when the inlet temperature for keeping compressor is constant
Height arrives 26-30MPa, preferably 28MPa, increases the density of ethylene in polyethylene reactor, and the conversion ratio of ethylene improves, polymer
Yield increases therewith, to improve polymerization reaction load.Described adjusts it when the inlet temperature for keeping compressor is constant
Inlet pressure can refer to when keeping the compressor inlet temperature under design conditions constant, improve the inlet pressure of compressor,
It is also possible to improve inlet pressure again on the basis of adjusting the inlet temperature of compressor to predetermined temperature.
In a preferred embodiment of the invention, the operation for adjusting reacting initial temperature, which is included in front of polymerization reaction, to be needed pair
Reaction mass is preheated, and 160-165 DEG C of temperature after preheating reaction mass, and preferably 160 DEG C improve polymerization reaction
Load.According to a specific embodiment, it can use preheater and reaction mass preheated, it will be pre- under design conditions
The outlet temperature of hot device is reduced to 160-165 DEG C.Preheating step is to be rapidly achieved the initial reaction temperature of reactant and draw
Hair reaction needed for temperature, improve polymerization reaction efficiency, while make the Temperature Distribution of inside reactor tend to rationally, reduce because
Wall sticking phenomenon caused by high molecular weight material generates.In the present invention, warm-up operation reduces the initial temperature of polymerization reaction, makes
Obtaining when polymerization reaction reaches balance allows the heat discharged to increase, and the conversion ratio and polymer output of ethylene increase, thus
Improve polymerization reaction load.
In the above method of the invention, the control of reactor wall temperature can use existing temperature control method and set
It is standby, as long as being able to satisfy the temperature requirement that polymerization reaction occurs in reactor.In a preferred embodiment of the invention, instead
The outside of device is answered to be provided with heat exchange jacket, the temperature of reactor wall is adjusted by the temperature of the heat transferring medium in the heat exchange jacket
Control.Preferably, which is heat-exchanging water.The operation that reaction peak temperature is adjusted in the present embodiment includes in control reactor
The peak temperature in portion is 304-308 DEG C, and preferably 307 DEG C, the heat that polymerization reaction allows to release when reaching balance increases, ethylene
Conversion ratio improves, and polymer output increases therewith, to improve polymerization reaction load.
During polymerization reaction, by adjusting the flow and temperature of heat-exchanging water, reaction heat is withdrawn from.Had according to one
The embodiment of body, the operation for adjusting the heat transferring medium temperature difference includes by the heat-exchanging water of each circulation loop of high-pressure polyethylene device
Flow improves 5-10% on the basis of former design conditions, with control reactor entrance the heat transferring medium temperature difference be 10-15 DEG C,
The cooling ability of the circulatory system is improved, the conversion ratio of ethylene improves, and polymer output increases therewith, so that it is anti-to improve polymerization
Answer load.
Using the various combination of above-mentioned load up operating method, polymerization reaction load, and combination can further improve
The Load results that difference obtains are different, and expand the adjustable range of polymerization reaction load.It is a kind of preferred according to the present invention
Embodiment, in the case where keeping design conditions, the inlet temperature of compressor is constant, and the inlet pressure for adjusting compressor is 26-30MPa, excellent
28MPa is selected, and the outlet temperature of preheater is adjusted to 160-165 DEG C, preferably 160 DEG C, adjusts the peak value temperature of inside reactor
Degree is 304-308 DEG C, preferably 307 DEG C, while the heat transferring medium temperature difference for controlling each reactor entrance reaches 10-15 DEG C, it is above-mentioned
In the case where operation while implementation, the load of polyethylene device reaches highest.
It, can also be by controlling reaction pressure, polymerization under design conditions instead when high-pressure polyethylene device needs load down
Initial temperature, reaction peak temperature, the heat transferring medium temperature difference or initiator additive amount is answered to achieve the goal, the combination of aforesaid operations can
Polymerization reaction load is reduced to some extent.
In a preferred embodiment of the invention, in load down operation, the operation for adjusting reaction pressure is included in guarantor
Hold compressor inlet pressure it is constant when, the inlet temperature of compressor is increased to 40-45 DEG C, preferably 43 DEG C, keeps polyethylene anti-
The density of ethylene in device is answered to reduce, the conversion ratio of ethylene reduces, and polymer output is reduced therewith, so that it is negative to reduce polymerization reaction
Lotus.Described adjusts its inlet temperature when the inlet pressure for keeping compressor is constant, can refer in the case where keeping design conditions
Compressor inlet pressure it is constant when, improve the inlet temperature of compressor, be also possible to adjust by the inlet pressure of compressor
Inlet temperature is improved again on the basis of to predetermined value.
In a preferred embodiment of the invention, the outlet temperature of preheater is adjusted to 165-170 DEG C, so that reaction
Temperature control after material preheating is 165-170 DEG C, and preferably 170 DEG C reduce polymerization reaction load.
In a preferred embodiment of the invention, the operation for adjusting reaction peak temperature includes control inside reactor
Peak temperature is 298-302 DEG C, and preferably 300 DEG C, the heat that polymerization reaction allows to release when reaching balance increases few, the conversion of ethylene
Rate reduces, and polymer output increases therewith, to reduce polymerization reaction load.
In a preferred embodiment of the invention, the operation for adjusting the heat transferring medium temperature difference includes by reactor entrance
The control of the heat transferring medium temperature difference is 15-20 DEG C, and preferably 20 DEG C, the cooling ability of the circulatory system reduces, the conversion ratio of ethylene and polymerization
Produce amount, which decreases, to be added, to reduce polymerization reaction load.
To guarantee that polymerization reaction is gone on smoothly, oxygen, air, organic is put by actual product requirements into reactor
Or mixtures thereof peroxide is used as initiator, and the decomposition and consumption of the initiator enters polymerization reaction rank for initiation reaction material
Section.In a preferred embodiment of the invention, the reactor of high-pressure polyethylene device includes four reaction areas, adjusts initiator
The operation of additive amount includes stopping adding initiator into the 4th reaction zone, causes the polymerization reaction in the 4th reaction zone gradually whole
Only, the reaction of other reaction zones is unaffected, and the conversion ratio of ethylene and the yield of polymer decrease, to reduce device
Integral load.
Using the various combination of above-mentioned load down operating method, polymerization reaction load, and combination can be further decreased
The Load results that difference obtains are different, and expand the adjustable range of polymerization reaction load.In a kind of preferred reality of the present invention
It applies in example, keeps the compressor inlet pressure under design conditions constant, the inlet temperature for adjusting compressor is 40-45 DEG C, preferably
43 DEG C, the outlet temperature for controlling preheater is 165-170 DEG C, preferably 170 DEG C, while the peak temperature for adjusting inside reactor is
The heat transferring medium temperature difference control of 298-302 DEG C, preferably 300 DEG C and reactor entrance is 15-20 DEG C, preferably 20 DEG C, and stop
The only initiator injection in the 4th reactor, in the case that aforesaid operations are implemented simultaneously, the load of polyethylene device reaches minimum.
As shown in Fig. 2, the present invention also provides a kind of load adjustment system of high-pressure polyethylene device, which includes:
Judging unit 1 deposits requirement for judging whether the storage capacity of reaction mass meets tank.
By-pass unit 2, when the storage capacity of reaction mass meet tank deposit require when, for taking bypass operation, not to high pressure
The load of polyethylene device adjusts；
Load processing unit 3, when the storage capacity of reaction mass, which is unsatisfactory for tank, deposits standard, for high-pressure polyethylene device
It takes load up or load down to operate, including adjusts reaction pressure, reacting initial temperature, reaction peak temperature, heat transferring medium temperature
Difference increases or decreases polymerization reaction load at least one reaction condition in initiator additive amount.
A kind of specific embodiment according to the present invention, load processing unit 3 include:
Reaction pressure adjusts unit 30, for adjusting the entrance of compressor when the inlet temperature for keeping compressor is constant
Pressure is 26-30MPa to improve polymerization reaction load；
And/or initial temperature adjusts unit 31, is 160-165 DEG C to mention for adjusting the temperature after reaction mass preheats
High polymerization reaction load；
And/or peak temperature adjusts unit 32, for adjust 304-308 DEG C of the reaction peak temperature of inside reactor with
Improve polymerization reaction load；
And/or heat transferring medium adjusts unit 33, for controlling the heat transferring medium temperature difference of reactor entrance for 10-15
DEG C to improve polymerization reaction load.
Another specific embodiment according to the present invention, reaction pressure adjust unit 30 and are also used to keeping compressor
When inlet pressure is constant, the inlet temperature for adjusting compressor is 42-47 DEG C.
Another specific embodiment according to the present invention, initial temperature adjusting unit 31 are also used to adjust reaction mass pre-
Temperature after heat is 165-170 DEG C to reduce polymerization reaction load.
Another specific embodiment, peak temperature adjust unit 32 and are also used to adjust inside reactor according to the present invention
Reaction peak temperature be 298-302 DEG C to reduce polymerization reaction load.
Another specific embodiment, heat transferring medium adjust unit 33 and are also used to reactor entrance according to the present invention
The heat transferring medium temperature difference control for 15-20 DEG C to reduce polymerization reaction load.
Preferably, load processing unit 3 further includes that polymerization reaction adjusts unit 34, is added for stopping into the 4th reaction zone
Add initiator to reduce polymerization reaction load.
The present invention also provides a kind of computer readable storage medium, instruction is stored in storage medium, when it is being calculated
When being run on machine, so that computer executes load adjustment method above-mentioned.
The various ways that the present invention program can be covered by claim is implemented, will in conjunction with the embodiments in specification
It elaborates.It should be noted that in the absence of conflict, embodiment relevant to load up or load down and embodiment
In feature can be combined with each other, and combination multiplicity.
Comparative example 1
High-pressure polyethylene device is under design conditions when stable operation, according to a kind of specific embodiment, compressor
Inlet pressure is 22-27MPa, is specifically as follows 25MPa, and inlet temperature is 35-40 DEG C, is specifically as follows 40 DEG C, preheater
Outlet temperature is 160-165 DEG C, is specifically as follows 164 DEG C, and in each circulation loop of high-pressure polyethylene device, is exchanged heat
The flow and temperature of water make the reaction peak temperature inside polyethylene reactor be maintained at 300-304 DEG C, specially 303 DEG C.
Polymerization reaction load is 100% when high pressure polyethylene reactor is run under above-mentioned design conditions, the production of polyethylene
Amount reaches 40.5 ton/hours.
Embodiment 1
Unlike comparative example 1, keep the inlet temperature of compressor constant, the inlet pressure for adjusting compressor is 26-
30MPa, preferably 28MPa, so that compared with original design operating condition, the every raising 3MPa of the inlet pressure of compressor is transported to reaction
Ethylene tolerance in device increases by 1 ton/hour, therefore the density for being transported to ethylene in polyethylene reactor increases, conversion of ethylene
It improves, the yield of final polyethylene reaches 40.8 ton/hours, and the polymerization reaction load of high-pressure polyethylene device is increased to former design
The 100.7% of load.
Embodiment 2
Unlike comparative example 1, adjust inside reactor reaction peak temperature be 304-308 DEG C, preferably 307 DEG C,
Since the heat for allowing to release when polymerization reaction reaches balance increases, the conversion ratio of ethylene is improved, and the yield of final polyethylene reaches
To 41.7 ton/hours, the polymerization reaction load of high-pressure polyethylene device is increased to the 103% of former Design cooling load.
Embodiment 3
Unlike comparative example 1, the flow and temperature of heat-exchanging water in control loop circuit, it is ensured that each reactor entrance
Heat exchange water temperature difference be 10-15 DEG C, the reaction heat that polymerization reaction allows to release when reaching balance increases, and the conversion ratio of ethylene mentions
Height, the yield of final polyethylene reach 40.9 ton/hours, and the polymerization reaction load of high-pressure polyethylene device is increased to Design cooling load
101%.
Embodiment 4
Unlike comparative example 1, in the case where the inlet temperature for keeping compressor is 35-40 DEG C preferably 40 DEG C, mention
Its high inlet pressure is 26-30MPa, preferably 28MPa, and then reducing reaction initial temperature is 160-165 DEG C, preferably 160 DEG C, is adjusted
The peak temperature for saving inside reactor is 304-308 DEG C, the flow of heat-exchanging water in preferably 307 DEG C, then control loop circuit, with true
The heat exchange water temperature difference for protecting each reactor entrance is 10-15 DEG C, and the conversion ratio of ethylene further increases, the yield of final polyethylene
Reach 43.3 ton/hours, the polymerization reaction load of high-pressure polyethylene device is increased to the 107% of former Design cooling load.
Embodiment 5
Unlike comparative example 1, keeping the inlet pressure of compressor is 25MPa, and the inlet temperature for adjusting compressor is
40-45 DEG C, preferably 43 DEG C so that compared with original design operating condition, the ethylene tolerance being transported in reactor reduce about 1.35 tons/
Hour.Since the density of ethylene in reactor reduces, the yield of final polyethylene reaches 40.1 ton/hours, high pressure polyethylene dress
The polymerization reaction load reduction set to former Design cooling load 99%.
Embodiment 6
Unlike comparative example 1, reaction mass preheating after temperature be 165-170 DEG C, preferably 170 DEG C so that polymerization
The heat that reaction allows to discharge when reaching balance reduces, and the conversion ratio of ethylene reduces, and the yield of final polyethylene reaches 40.13
Ton/hour, therefore the polymerization reaction load reduction of reactor is to the 99% of Design cooling load.
Embodiment 7
Unlike comparative example 1, stop adding initiator into the 4th reactor, so that the polymerization in the 4th reactor
Reaction gradually terminates, and the transformation in planta rate of ethylene reduces in device, and the yield of final polyethylene reaches 36.3 ton/hours, high pressure
The polymerization reaction load reduction of polyethylene device entirety to former Design cooling load 89.6%.
Embodiment 8
Unlike comparative example 1, the inlet pressure of compressor is adjusted as 22-27MPa, after preferably 25MPa, improves compression
The inlet temperature of machine be 40-45 DEG C, preferably 43 DEG C, then make reaction mass preheat after 165-170 DEG C of temperature, preferably 170
DEG C, 298-302 DEG C of peak temperature in reactor is controlled, preferably 300 DEG C, the initiator being simultaneously stopped in the 4th reactor is infused
Enter, aforesaid operations reduce the conversion ratio of ethylene in device, and the yield of polyethylene reduces, and the polymerization of high-pressure polyethylene device is anti-
Answer load reduction to the 83% of former Design cooling load.
The measurement of polymerization reaction load
The load judge index of high-pressure polyethylene device first is that the polymer output obtained in polymerization reaction, polymerize produce
Amount is higher, and the polymerization reaction load of reactor is higher.By measurement embodiment 1-8 and the obtained polymer output of comparative example 1 come
The load of machinery systems of judgment means, the load of machinery systems refer to fluctuation of device load on the basis of its Design cooling load, as a result such as 1 institute of table
Show.
Table 1
The method that can be seen that embodiment according to the present invention 1-4 offer by the result of table 1, can be improved device
Polymerization reaction load can reach the 107% of Design cooling load；The method that embodiment according to the present invention 5-8 is provided, can drop
The polymerization reaction load of low device is minimum to can reach the 83% of Design cooling load.The above results are shown, utilize the embodiment of the present invention
The polymerization reaction load of the method for offer, reactor can adjust in the range of the 83-107% of former Design cooling load, significantly mention
The high Load Regulation ability of polyethylene device.
The present invention realizes following technical effect it can be seen from above description:
(1) the newly-increased, transformation without equipment and system, does not increase investment cost, carries out on the basis of existing equipment anti-
It answers condition and method to optimize to achieve the purpose that adjust device load, reduces cost；
(2) on the basis of design conditions, one or more reaction conditions in telo merization process are, it can be achieved that poly-
The adjusting of ethylene unit load to varying degrees, expands the load range of polyethylene device, enhances polyethylene dress
The Load Regulation ability set；
(3) method provided through the invention, avoidable upstream and downstream material is unbalance, so that corollary apparatus is stable, high load capacity
Operation, improves production efficiency, while reducing material consumption, energy consumption, improves the economic benefit of enterprise.
The preferred embodiment of the present invention has been described above in detail, and still, the present invention is not limited thereto.In skill of the invention
In art conception range, can with various simple variants of the technical solution of the present invention are made, including each technical characteristic with it is any its
Its suitable method is combined, and it should also be regarded as the disclosure of the present invention for these simple variants and combination, is belonged to
Protection scope of the present invention.
Claims (10)
1. a kind of load adjustment method of high-pressure polyethylene device, which is characterized in that the described method includes:
Judge whether the storage capacity of reaction mass meets tank and deposit requirement, if so, not adjusting to the load of high-pressure polyethylene device
It is whole；
If the storage capacity of reaction mass is more than that most tall can deposits standard, load up is taken to operate the high-pressure polyethylene device,
Come including at least one reaction condition in adjusting reaction pressure, reacting initial temperature, reaction peak temperature, the heat transferring medium temperature difference
Improve polymerization reaction load；
If the storage capacity of reaction mass deposits standard lower than minimum tank, load down is taken to operate the high-pressure polyethylene device,
Including adjusting in reaction pressure, reacting initial temperature, reaction peak temperature, the heat transferring medium temperature difference and initiator additive amount at least
One reaction condition reduces polymerization reaction load.
2. the method according to claim 1, wherein polymerization reaction occur before to the reaction mass preheat,
In load up operation, the operation for adjusting reacting initial temperature includes: the temperature 160-165 after preheating the reaction mass
℃；
In load up operation, the operation for adjusting reaction pressure includes: to adjust pressure when the inlet temperature for keeping compressor is constant
The inlet pressure of contracting machine is 26-30MPa；
The operation of adjusting reaction peak temperature includes: that the reaction peak temperature of adjusting inside reactor is 304-308 DEG C.
3. the method according to claim 1, wherein the outside of reactor is provided with heat exchange jacket, the reaction
The inner wall temperature of device is regulated and controled by the heat transferring medium in the heat exchange jacket, in load up operation, adjusts the heat transferring medium temperature difference
Operation include: that control the heat transferring medium temperature difference of the reactor entrance be 10-15 DEG C.
4. the method according to claim 1, wherein adjusting the operation packet of reaction pressure in load down operation
Include: when the inlet pressure for keeping compressor is constant, the inlet temperature for adjusting compressor is 40-45 DEG C；
The operation for adjusting reacting initial temperature includes: 165-170 DEG C of temperature after preheating the reaction mass；
The operation of adjusting reaction peak temperature includes: that the reaction peak temperature of adjusting inside reactor is 298-302 DEG C.
5. the method according to claim 1, wherein adjusting the behaviour of the heat transferring medium temperature difference in load down operation
Work includes: that control the heat transferring medium temperature difference of reactor entrance be 15-20 DEG C.
6. the method according to claim 1, wherein the reactor of the high-pressure polyethylene device includes four anti-
Area is answered, in load down operation, the operation for adjusting initiator additive amount includes: to stop adding initiator into the 4th reaction zone.
7. a kind of load adjustment system of high-pressure polyethylene device, which is characterized in that the system comprises:
Judging unit deposits requirement for judging whether the storage capacity of reaction mass meets tank；
By-pass unit, when the storage capacity of reaction mass meet tank deposit require when, for taking bypass operation, not to high pressure polyethylene
The load of device adjusts；
Load processing unit, when the storage capacity of reaction mass, which is unsatisfactory for tank, deposits standard, for taking high-pressure polyethylene device
Load up or load down operation, including adjust reaction pressure, reacting initial temperature, reaction peak temperature, the heat transferring medium temperature difference and
At least one reaction condition in initiator additive amount increases or decreases polymerization reaction load.
8. system according to claim 7, which is characterized in that the load processing unit includes:
Reaction pressure adjusts unit, for when the inlet temperature for keeping compressor is constant, the inlet pressure for adjusting compressor to be
26-30MPa is to improve polymerization reaction load；
And/or initial temperature adjusts unit, is 160-165 DEG C to improve for adjusting the temperature after the reaction mass preheats
Polymerization reaction load；
And/or peak temperature adjusts unit, the reaction peak temperature for adjusting inside reactor is 304-308 DEG C to improve
Polymerization reaction load；
And/or heat transferring medium adjusts unit, is 10-15 DEG C for controlling the heat transferring medium temperature difference of the reactor entrance
To improve polymerization reaction load.
9. system according to claim 8, which is characterized in that the reaction pressure adjusts unit and is also used to keeping compressing
When the inlet pressure of machine is constant, the inlet temperature for adjusting compressor is 40-45 DEG C to reduce polymerization reaction load；
It is 165-170 DEG C poly- to reduce that the initial temperature, which adjusts the temperature that unit is also used to adjust after the reaction mass preheating,
Close reaction load；
It is 298-302 DEG C poly- to reduce that the peak temperature, which adjusts unit and is also used to adjust the reaction peak temperature of inside reactor,
Close reaction load；
The heat transferring medium adjust unit be also used to control the heat transferring medium temperature difference of the reactor entrance for 15-20 DEG C with
Reduce polymerization reaction load.
10. system according to claim 8 or claim 9, which is characterized in that the load processing unit further includes polymerization reaction tune
Unit is saved, for stopping adding initiator into the 4th reaction zone to reduce polymerization reaction load.
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