CN202610145U - Inhibitor injection device for polyolefin producing craft of gas phase fluidized bed - Google Patents
Inhibitor injection device for polyolefin producing craft of gas phase fluidized bed Download PDFInfo
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- CN202610145U CN202610145U CN 201220126225 CN201220126225U CN202610145U CN 202610145 U CN202610145 U CN 202610145U CN 201220126225 CN201220126225 CN 201220126225 CN 201220126225 U CN201220126225 U CN 201220126225U CN 202610145 U CN202610145 U CN 202610145U
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- suppressor factor
- recycle gas
- injection device
- gas
- recycle
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Abstract
The utility model relates to an inhibitor injection device for a polyolefin producing craft of a gas phase fluidized bed. The device comprises a fluidized bed reactor, a Venturi tube, a recycle gas compressor, a recirculation cooler, a catalyst measure injection device and a discharging device. The fluidized bed reactor is sequentially connected with the Venturi tube, the recycle gas compressor and the recirculation cooler through a recycle gas pipe, and then returns to the fluidized bed reactor which is connected with the catalyst measure injection device and the discharging device, a distribution plate is arranged inside the fluidized bed reactor, and an ethylene injection port is arranged between the Venturi tube and the recycle gas compressor. The device also comprises inhibitor injection equipment which is connected to the upstream or downstream of the recycle gas compressor or the recycle gas compressor. Compared with the prior art, the inhibitor injection device for the polyolefin producing craft of the gas phase fluidized bed has the advantages of avoiding scaling and blocking of a reaction circulation loop, prolonging operation cycle and the like.
Description
Technical field
The utility model relates to a kind of polyolefinic production equipment, especially relates to a kind of gas-phase fluidized-bed production polyolefin process and uses the suppressor factor injection device.
Background technology
In worldwide extensively a large amount of at present gas-phase fluidized-bed manufacture of polyolefins technologies that adopt, how to guarantee system's non-scaling, do not stop up, realize that long-term operation is that all produce the elementary object of pursuing.Especially to the more and more large-scale change of production equipment in recent years, this target is more outstanding.Polymerizing catalyst adopts slurries attitude catalyzer (granules of catalyst soaks and is dispersed in the white oil) and degree of depth condensation operation technology extensively to be employed in a large number; But the negative effect that the utilization of this maximization and new catalyst and operative technique brings is: 1. because many white oil, condensing agents etc. in the fluidizing agent; And granules of catalyst also than traditional supported catalyst particle diminish, the density step-down; Be entrained to the loop from fluidized-bed thereby be recycled gas more easily, before and after pipeline, compressor impeller spiral case, and recycle gas cooler in deposition or stop.2. recycle gas is formed, temperature, pressure etc. all possess and these granules of catalyst or the further polymeric condition of fine powder resin, has increased the weight of the degree of fouling.3. especially the suction port of compressor needs a large amount of pure alkene (like ethene) to purge the impeller eye and uses as dry gas seals gas; Make that ethylene concentration is the highest place, total system loop in the compressor scroll; Compressor impeller sheet rear side is again the gas flow stagnant area, is the position that polymerization and fouling take place the most easily.4. the fouling (polymkeric substance) that sticks to circulation gas pipeline inwall is at high temperature contained the air scour surface that can make it the swollen condensing agent, is prone to come off; Thereby the water cooler mouth of pipe that causes downstream stops up and distribution plate orifices is stopped up; More be prone to cause activated fine powder pitch deposition to form the vicious cycle that polymerization → thickening → come off → downstream are stopped up, cause gas-phase fluidized-bed polyolefin device operation difficulty, the cycle shortens; Efficient is low, loses huge.
Summary of the invention
The purpose of the utility model is exactly for the defective that overcomes above-mentioned prior art existence a kind of the prevent fouling of reaction cycle loop, obstruction to be provided, and the gas-phase fluidized-bed production polyolefin process that prolongs the cycle of operation is used the suppressor factor injection device.
The purpose of the utility model can realize through following technical scheme: a kind of gas-phase fluidized-bed production polyolefin process is used the suppressor factor injection device; This device comprises fluidized-bed reactor, venturi tube, recycle gas compressor, recirculation cooler, catalyzer metering injecting device, discharge device; Described fluidized-bed reactor returns fluidized-bed reactor after connecting venturi tube, recycle gas compressor, recirculation cooler successively through recycle gas line; Fluidized-bed reactor connects catalyzer metering injecting device and discharge device; Be provided with grid distributor in the fluidized-bed reactor, be provided with the ethene inlet between described venturi tube and the recycle gas compressor, it is characterized in that; Described device also comprises the suppressor factor injection device, and this suppressor factor injection device is connected in the recycle gas compressor upper reaches, downstream or itself.
Described suppressor factor injection device comprises suppressor factor steel cylinder, reducing valve and flow director; The suppressor factor steel cylinder is connected to recycle gas compressor through reducing valve and flow director successively; Perhaps be connected on the recycle gas line between recycle gas compressor and the recirculation cooler, perhaps be connected on the recycle gas line between venturi tube and the recycle gas compressor.
Described recycle gas compressor comprises the turning vane that is arranged on the ingress, is arranged on inside and connects the ratio wheel of motor, goes up the sealing member that is provided with than wheel, and recycle compressor is provided with the circulation gas outlet.
When described suppressor factor injection device connected recycle compressor itself, the suppressor factor decanting point was provided with 2 at least, was arranged on the purging olefin gas pipeline of recycle compressor body and on the dry gas seals feed channel.
Suppressor factor in the described suppressor factor injection device is selected for use can be under 30 ℃～125 ℃, 0～20MPa, concentration of olefin 1～100%mol, can reduce or stop the active material of polymerizing catalyst in 0.1～5 second.
The add-on of described suppressor factor is for containing suppressor factor 1ppb～3000ppb in recycle gas, described suppressor factor is through injection device behind the inert gas dilution.
Described suppressor factor is one or more the mixed gas in carbon monoxide, carbonic acid gas, oxygen, the hydrogen sulfide.
Compared with prior art; (by the fluidized-bed reactor that contains grid distributor, regulate by circulation gas pipeline and flow measurement on the reaction cycle loop of existing gas-phase fluidized-bed polyolefin process for the utility model; Recycle gas compressor and blanket gas replenish; Water cooler), in the recycle gas compressor upper reaches or downstream or the dry gas seals system of itself, the suppressor factor injection device that is connected and installed good antiscale property, obstruction, the prolongation cycle of operation is installed.The utility model provides 3 kinds can stop or suppress to be fluidized fine powder resin that gas carries secretly out from gas-phase fluidized-bed reactor in circulation loop (in circulation gas pipeline, the loop compression casing, water cooler and grid distributor inlet), to continue polyreaction; Thereby cause in the circulation gas pipeline; Fouling in the recycle gas compressor spiral case, the suppressor factor that stops up water cooler and grid distributor is then selected for use, proportioning is confirmed, the device of choice of location and IR regulation and control.
Description of drawings
Fig. 1 is the gas-phase fluidized-bed production polyolefin device of the utility model;
Fig. 2 is the utility model suppressor factor injection device;
Fig. 3 is the structural representation of recycle gas compressor part.
Among the figure: 1-fluidized-bed reactor, 2-recycle gas line a, 3-recycle gas compressor, 4-recycle gas line b, 5-recycle gas cooler, 6-recycle gas line c, 7-grid distributor, 8-venturi tube, 9-catalyzer metering injecting device, 10-discharge device, 11-motor, 12-suppressor factor steel cylinder a, 13-suppressor factor steel cylinder b, 14-flow director, 15-suppressor factor in the injection phase on the circulating air compressor, the injection phase of 16-suppressor factor on recycle gas line b; The injection phase of 17-suppressor factor on recycle gas line c, 18-turning vane, the outlet of 19-circulation gas, 20-circulation gas inlet, 21-are than wheel, 22-sealing member.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is elaborated.
Embodiment
Shown in Fig. 1-3; A kind of gas-phase fluidized-bed production polyolefin process is used the suppressor factor injection device; This device comprises fluidized-bed reactor 1, venturi tube 8, recycle gas compressor 3, recirculation cooler 5, catalyzer metering injecting device 9, discharge device 10; Described fluidized-bed reactor 1 connects venturi tube 8 through recycle gas line a2, and venturi tube 8 is through recycle gas line b4 recycle gas compressor 3, and recycle gas compressor 3 connects recirculation cooler 5 through recycle gas line c6; Return fluidized-bed reactor 1 then; Fluidized-bed reactor 1 connects catalyzer metering injecting device 9 and discharge device 10, is provided with grid distributor 7 in the fluidized-bed reactor 1, is provided with the ethene inlet between described venturi tube 8 and the recycle gas compressor 3; Described device also comprises the suppressor factor injection device, and this suppressor factor injection device is connected in the recycle gas compressor upper reaches, downstream or itself.
Described suppressor factor injection device comprises be connected in series suppressor factor steel cylinder a12 and suppressor factor steel cylinder b13, reducing valve and flow director 14; When the suppressor factor injection device is connected the recycle gas compressor upper reaches; Suppressor factor steel cylinder a12 and suppressor factor steel cylinder b13 are connected on the recycle gas line a4 between venturi tube 8 and the recycle gas compressor 3 through reducing valve and flow director successively, suppressor factor and ethylene gas or utilize that existing oxygen is counter and add (O2 add back) system and get into; When the suppressor factor injection device was connected the recycle gas compressor downstream, suppressor factor steel cylinder a12 and suppressor factor steel cylinder b13 were connected on the recycle gas line c6 between recycle gas compressor 3 and the recirculation cooler 5 through reducing valve and flow director successively; When the suppressor factor injection device is connected recycle gas compressor itself; The suppressor factor decanting point is provided with 2 at least; Be arranged on the purging olefin gas pipeline of recycle compressor body and on the dry gas seals feed channel, suppressor factor gets into compressor body with purging ethene and dry gas seals gas.Supply above-mentioned three position effects in injection phase on the polymerisation loop good at gas-phase fluidized-bed polyolefine, the common feature at this 3 place is: temperature, pressure are near the condition of reactor drum; Gas composition is near reactor condition, even ethylene concentration is higher; Having small-particle (still have necessarily active, contain catalyst fines from what reactor drum was carried secretly) sedimentation or the potential of dead angle maybe; Apart from recycle gas water cooler, reactor distributing plate certain-length is arranged, leave the time for the continuation reaction of aforementioned fine powder, also make the fine powder of suppressor factor and residual activity that arranged duration of contact comparatively fully.In the injection phase, 2 place, be optimum position with injection phase at the circulating air compressor body.
The proportioning of selecting suppressor factor for use of the suppressor factor in suppressor factor steel cylinder a12 and the suppressor factor steel cylinder b13; Supply the selection of the injection phase on the polymerisation loop at gas-phase fluidized-bed polyolefine; The regulating and controlling of IR is: the suppressor factor of 1. selecting for use can be under 30 ℃～125 ℃, 0～20MPa, concentration of olefin 1～100%mol, and (0.1～5 second) reduces or stop the activity of polymerizing catalyst fast.2. when recycle gas from inlet after grid distributor returns the fluidized-bed reactor, injecting inhibitor does not have negative interaction to normal olefinic polyreaction or is not enough to produce negative interaction influence.3. the injection phase of suppressor factor is chosen in and can guarantees in circulating line, to be uniformly dispersed, especially to the normal polymeric place that produces in the loop, and the compressor wheel backface high like ethylene concentration, pressure is high, concentration is high, and the mobile not smooth position of recycle gas.4. IR is trace and controlled, guarantees that the suppressor factor gas content is in the recycle gas: 1ppb～3000ppb (pressing the different sorts suppressor factor); 5. suppressor factor is selected the compound that contains the certain proportion carbonyl group such as the mixed gas of carbon monoxide or carbonic acid gas and nitrogen for use.
Described recycle gas compressor comprises the turning vane 18 that is arranged on the ingress, is arranged on inside and connects the ratio wheel 21 of motor, and than the sealing member 22 that is provided with on the wheel 21, recycle compressor is provided with circulation gas outlet 19 and circulation gas inlet 20.
The suppressor factor of said injection gas is for measure control convenience, the mixed gas behind the available inert gas dilution; Described inhibition dosage is to the inhibiting carbon monoxide of having of polymerization catalyst, carbonic acid gas, oxygen, hydrogen sulfide, and mixed gas.The suppressor factor IR can directly be measured, and the concentration of its suppressor factor in recycle gas gets through calculating.
Claims (4)
1. a gas-phase fluidized-bed production polyolefin process is used the suppressor factor injection device; This device comprises fluidized-bed reactor, venturi tube, recycle gas compressor, recirculation cooler, catalyzer metering injecting device, discharge device; Described fluidized-bed reactor returns fluidized-bed reactor after connecting venturi tube, recycle gas compressor, recirculation cooler successively through recycle gas line; Fluidized-bed reactor connects catalyzer metering injecting device and discharge device; Be provided with grid distributor in the fluidized-bed reactor, be provided with the ethene inlet between described venturi tube and the recycle gas compressor, it is characterized in that; Described device also comprises the suppressor factor injection device, and this suppressor factor injection device is connected in the recycle gas compressor upper reaches, downstream or itself.
2. a kind of gas-phase fluidized-bed production polyolefin process according to claim 1 is used the suppressor factor injection device; It is characterized in that; Described suppressor factor injection device comprises suppressor factor steel cylinder, reducing valve and flow director; The suppressor factor steel cylinder is connected to recycle gas compressor through reducing valve and flow director successively, perhaps is connected on the recycle gas line between recycle gas compressor and the recirculation cooler, perhaps is connected on the recycle gas line between venturi tube and the recycle gas compressor.
3. a kind of gas-phase fluidized-bed production polyolefin process according to claim 1 and 2 is used the suppressor factor injection device; It is characterized in that; Described recycle gas compressor comprises the turning vane that is arranged on the ingress; Be arranged on inside and connect the ratio wheel of motor, go up the sealing member that is provided with than wheel, recycle compressor is provided with the circulation gas outlet.
4. a kind of gas-phase fluidized-bed production polyolefin process according to claim 3 is used the suppressor factor injection device; It is characterized in that; When described suppressor factor injection device connects recycle compressor itself; The suppressor factor decanting point is provided with 2 at least, is arranged on the purging olefin gas pipeline of recycle compressor body and on the dry gas seals feed channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220126225 CN202610145U (en) | 2012-03-29 | 2012-03-29 | Inhibitor injection device for polyolefin producing craft of gas phase fluidized bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220126225 CN202610145U (en) | 2012-03-29 | 2012-03-29 | Inhibitor injection device for polyolefin producing craft of gas phase fluidized bed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202610145U true CN202610145U (en) | 2012-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220126225 Expired - Fee Related CN202610145U (en) | 2012-03-29 | 2012-03-29 | Inhibitor injection device for polyolefin producing craft of gas phase fluidized bed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202610145U (en) |
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2012
- 2012-03-29 CN CN 201220126225 patent/CN202610145U/en not_active Expired - Fee Related
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20180329 |
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| CF01 | Termination of patent right due to non-payment of annual fee |