CN2562864Y

CN2562864Y - Polymerization still

Info

Publication number: CN2562864Y
Application number: CN 02276835
Authority: CN
Inventors: 李卫; 袁云中; 邱力佳; 匡良明; 甘望星; 李蓉
Original assignee: Baling Petrochemical Co Ltd
Current assignee: Baling Petrochemical Co Ltd
Priority date: 2002-07-05
Filing date: 2002-07-05
Publication date: 2003-07-30
Anticipated expiration: 2012-07-05

Abstract

The utility model relates to a polymerization still, in particular to a batch type liquidoid noumenon polypropylene polymerization still, which is characterized in that: an agitator adopts double ribbons in the upper part and four pitched blade scrapers at the bottom part; a shaft seal adopts a combination of a stuffing seal and a labyrinth seal, and a head-punching-bottom stuffing device is added at the bottom part; a jacket adopts a combined structure of a flow guide plate with double helix and radiating fins; an inner cooling pipe adopts an allotype calandria structure; the top of an end enclosure is provided with a gas phase condensing reflux system; the volume of the autoclave body ranges from 16m3 to 50m3. The utility model solves the problem of too large size of the prior polymerization still and lack of heat retrieving ability, strengthens the hydrogen regulation effect, and improves both the single-batch output and the quality of the products.

Description

A kind of polymeric kettle

Technical field

The utility model relates to a kind of polymeric kettle, particularly a kind of batch liquid bulk polymerization polypropylene polymerization kettle.

Background technology

At present, the propylene polymerization still overwhelming majority used of China is the 12m that develops the eighties ³Polymeric kettle only has the 4m of minute quantity ³, 15m ³Polymeric kettle.Wherein, 4m ³Polymeric kettle is just progressively eliminated, 15m ³The technical performance of polymeric kettle fails to be applied owing to do not break through for a long time.12m ³Polymeric kettle is because volume is less than normal, and to remove heat energy power obviously not enough when using effective catalyst to drive in addition, makes 5000 tons of single still annual production less thaies.So not only increased the investment of equipment use place, process pipelines, control etc., and brought bigger difficulty to equipment control.

Aspect agitator design, 12m ³What use was maximum in the polymeric kettle is single ribbon, but there is galloping in single ribbon, short deadly defect of axle envelope life-span; And the power of agitator of two ribbons is bigger than normal, and there be limited evidence currently of adopts.The end socket bottom scraper is the anchor formula the earliest, develops into single ribbon scraper, two ribbon scraper afterwards, but makes complicatedly, be difficult to guarantee and the end socket internal surface gaps, and stirring intensity a little less than, be prone to catalyst and sink to the bottom and produce a knot cup phenomenon.

Aspect the axle envelope, generally adopt two packing box seals, but end filler quick abrasion, leakage of oil are serious, influence product quality and catalyst activity, and end filler are changed difficult.

Aspect heat transfer, generally adopt the jacket structured and inner dactylethrae structure of band double helix deflector, still, because manufacture deviation, the leakage current of spiral deflector is serious, and the heat transfer area of dactylethrae is too little, resistance is big.Afterwards, have the people to change dactylethrae into the U-shaped pipe, though heat transfer area increases to some extent, flow velocity is too low, easily in U-bend section fouling plugging.Moreover the plate washer effect of dactylethrae and U-shaped pipe is not obvious, influences mixing effect.

Along with emerging in large numbers and trend that polymeric kettle maximizes of the development of domestic liquid phase noumenal method technology, efficient catalyst, make liquid-phase bulk polymerization technology to the stirring of reactor with remove hot property and proposed harsh more requirement, existing 12m ³Polymeric kettle has become restriction polymerization efficiency, product quality, production-scale bottleneck.

Summary of the invention

The purpose of this utility model just is to stir and heat transfer property by strengthening, and solves the polymeric kettle maximization and removes the not enough problem of heat energy power, and by improving the axle envelope, further stablize and strengthen hydrogen and transfer effect, thereby output per single reactor and product quality all are improved.

The technical scheme that realizes above-mentioned purpose is: the utility model comprises kettle (1), agitator (2), chuck (3), axle envelope (4), inner cool tube (5).Can also be provided with vapor condensation reflux (6) at the end socket top in case of necessity.

The volume of kettle (1) is at 16m ³～50m ³Between.

The ratio of height to diameter of kettle (1) is between 1.5～3.

Have the Long Circle hole on the two ribbons (8) in the top of agitator (2), scraper (7) shape is similar to the bottom (head) curved surface at the bottom of the four oblique leaves of bottom, and the gap between the two is even.

Chuck (3) is provided with radiating fin (14) near importing and exporting, and the chuck middle part is provided with radiating fin (14) and spiral deflector (15).

Filler (11) adopts high-elastic filler at the bottom of the gland sealed of axle envelope (4), and labyrinth seal divides upper and lower two sections, and following labyrinth (12) is the labyrinth motive bearing, and last labyrinth (13) are labyrinth power oil ring.

Inner cool tube (5) adopts the abnormal row tubular construction.

By above improvement, make original pair of ribbon of shaft power consumption rate of the present utility model reduce by 18%, the no longer leakage of oil in still of axle envelope, the axle envelope life-span prolongs 3 times, end filler is changed easily, and the heat transfer of chuck is further strengthened, and the heat transfer area of inner cool tube is 3 times of former dactylethrae, 2 times of the U-shaped pipe.It has solved polymeric kettle and has maximized and open the not enough problem of the heat energy power of removing of efficient existence, has strengthened hydrogen and has transferred effect, and it is feasible that the maximization of polymeric kettle is become, and output per single reactor and product quality all are improved.

Description of drawings

Fig. 1 is the utility model sketch;

Fig. 2 is the utility model agitator sketch;

Fig. 3 is the utility model axle envelope sketch;

Fig. 4 is the deflector and the fin sketch of the utility model chuck;

Fig. 5 is the utility model inner cool tube sketch;

Fig. 6 is the utility model vapor condensation reflux sketch.

1-kettle among the figure, 2-agitator, 3-chuck, 4-axle envelope, 5-inner cool tube, 6-vapor condensation reflux, scraper at the bottom of 7-four oblique leaves, 8-two ribbons, 9-round bar supports, 10-strength is pushed up towards end filler device, 11-end filler, 12-labyrinth motive bearing, 13-labyrinth oil ring, 14-radiating fin, 15-spiral deflector, 16-delivery port, 17-tangential water inlet, 18-down go up house steward, 19-tubulation group, 20-communicating pipe, 21-outlet pipe, 22-water inlet pipe, 23-fixed gas return port, 24-compressor, 25-filter, 26-pipeline, 27-gaseous phase outlet, 28-condenser.

The specific embodiment

Concrete structure below in conjunction with description of drawings the utility model embodiment:

As shown in Figure 1, the utility model comprises kettle (1), agitator (2), chuck (3), axle envelope (4), inner cool tube (5), vapor condensation reflux (6).

As shown in Figure 2, agitator of the present utility model (2) by two ribbons (8) and four oblique leaves at the bottom of scraper (7) combine.Have the Long Circle hole in the centre of ribbon, help reducing the power of agitator of two ribbons, and little to the mixed effect influence.Ribbon adopts pipe to support (9), can reduce to stir resistance, thereby reduction power consumption, just in case when being clamminess fouling owing to material, also, simultaneously, also reduced the local dead band phenomenon that angle steel causes than in the past unequal angle easy to clean, since pipe support each to bending strength equate that it is well suited for the complicated applied force situation of ribbon.Scraper was compared with scraper at the bottom of original double helix at the bottom of four oblique leaves were adopted in the bottom, and is simple in structure, be convenient to guarantee scraper intensity and with the gap uniformity of end socket inner surface, the effect of upwards stirring of material is also strengthened, thereby prevents that catalyst from sinking to the bottom, discharge is more thorough.

As shown in Figure 3, axle envelope of the present utility model (4) is combined by double-deck packing seal and upper and lower labyrinth seal.The problem that in the past adopts two packing seals to exist had: 1. filler quick abrasion; 2. sealing effectiveness is poor, and sealing cycle is short; 3. end filler is changed inconveniently, and each chemical plant is changed the end and all utilized still inner propene pressure during filler at present, and end filler is ejected, because propylene is inflammable, explosive, does abnormally dangerous like this.In order to overcome above-mentioned shortcoming, filler (11) adopts high-elastic filler at the bottom of the gland sealed of the utility model axle envelope (4), material is core elastic silica gel core, the tetrafluoro graphite fibre packing (non-asbestos product) that adds extraordinary lubricant, be characterized in: wear-resisting, self lubricity is good, good thermal conductivity makes the end filler replacement cycle by original 6 months, can extend to 1.5 years; The following labyrinth (12) of labyrinth seal is the labyrinth motive bearing, both played the sliding bearing effect, between axle and bearing, form multiple tracks annular pressure oil film again, the stability of this oil film is more stable than general even thin oil film, the labyrinth effect produces multistage pressure drop when gas reactor is up walked, also can stop powder to leak outside; The last labyrinth (13) of labyrinth seal is a labyrinth power oil ring, can further produce pressure drop, reduces gas leak, transfers effect thereby improve hydrogen; Change for making things convenient for end filler, the strength top is set towards end filler device (10), its operation principle is: during the polymeric kettle parking maintenance, nitrogen enters from following stuffing box bottom, strain behind the O shape rubber ring pressurized, be adjacent to groove and axle, force nitrogen upwards to push up filler (11) down, when nitrogen pressure reaches certain value, will pressure release, because of the pressure leak process time very of short duration, can produce sizable momentum, end filler is gone out.

As shown in Figure 4, chuck of the present utility model in be provided with deflector (15) and radiating fin (14) and form.Cylindrical shell in original chuck and end socket part only are provided with spiral deflector, because end socket true form error, the radially spiral stream guidance sheet metal forming of bottom bulkhead part and the difficulty of assembly welding are big, error is also big, very easily cause bottom tangential entry and near the streamline short circuit of outlet, make that the fouling of chuck is serious, heat-transfer effect is bad.Chuck of the present utility model has been cancelled the spiral deflector of top and the bottom, change near tangential entry (17) and top outlet (16) closeer radiating fin (14) is set, its height is less than 1/2 of chuck gap, play the heat transfer area that increases the jacket side kettle, the turbulence level that increases fluid, thus the augmentation of heat transfer effect.For turbulence level, the minimizing fouling that further improves spiral deflector (15) section fluid, between spiral deflector, also be provided with rarer radiating fin (14), after the fluid of certain flow rate is crossed fin, can produce strong eddy flow, help the online flushing of fouling.

As shown in Figure 5, inner cool tube of the present utility model adopts the abnormal row tubular construction, comb mainly by house steward (18) up and down, form tubulation group (19) communicating pipe (20).The tubulation group is arranged in juxtaposition by many heat exchanger tubes, and upper and lower side and house steward (18) welding up and down make each tubulation group (19) be together in series communicating pipe (20).Like this, compare with the U-shaped tubular construction with original dactylethrae, the heat transfer area in the still increases greatly.Because the diameter of tubulation is littler than the diameter of original dactylethrae and U-shaped pipe, the still internal volume that inner cool tube is accounted for when obtaining same heat exchange area is little, and tubulation can be light pipe, bellows or has the light pipe of interpolation thing.Because tubulation is radially arranged side by side, its baffle effect is obvious, can significantly improve stirring, heat-transfer effect.

As shown in Figure 6, the utility model also is provided with the vapor condensation reflux at the end socket top, and this device mainly is made up of condenser (28), compressor (24).Its operation principle: when removing hot peak, still inner propene steam is introduced still top condenser (28) through gaseous phase outlet (27), most of propylene steam is condensed into liquid propylene at tube side and goes in the still by gravity reflux, uncooled propylene steam and molecular weight regulator (hydrogen) are through pipeline (26), filter (25), under the pressurization of compressor (24), enter in the still through fixed gas return port (23), under stirring action, hydrogen can fully contact with material, thereby make hydrogen transfer effect to strengthen greatly, make the melt flow rate (MFR) of product, quality index such as molecular weight distribution all improve.

Claims

1, a kind of polymeric kettle comprises kettle (1), agitator (2), axle envelope (4), chuck (3), inner cool tube (5), and it is characterized in that: agitator (2) adopts the two ribbons (8) in top, scraper (7) structure at the bottom of the four oblique leaves of bottom; Axle envelope (4) adopts the combination of packing seal and labyrinth seal, and sets up the top towards end filler device (10) in the bottom; Chuck (3) adopts the combining structure of band double helix deflector (15) and radiating fin (14); Inner cool tube (5) adopts the abnormal row tubular construction.

2, polymeric kettle according to claim 1, the volume that it is characterized in that kettle (1) is at 16m ³～50m ³Between.

3, polymeric kettle according to claim 1, the ratio of height to diameter that it is characterized in that kettle (1) is between 1.5～3.

4,, it is characterized in that also being provided with vapor condensation reflux (6) at the end socket top according to claim 1 or 2 or 3 described polymeric kettles.

5, according to claim 1 or 2 or 3 described polymeric kettles, it is characterized in that having the Long Circle hole on the two ribbons (8) in top of agitator (2), scraper (7) shape is similar to the bottom (head) curved surface at the bottom of the four oblique leaves of bottom, and the gap between the two is even.

6, polymeric kettle according to claim 4 is characterized in that having the Long Circle hole on the two ribbons (8) in top of agitator (2), and scraper (7) shape is similar to the bottom (head) curved surface at the bottom of the four oblique leaves of bottom, and the gap between the two is even.

7, according to claim 1 or 2 or 3 described polymeric kettles, filler (11) adopts high-elastic filler at the bottom of it is characterized in that a gland sealed of envelope (4), labyrinth seal divides upper and lower two sections, and following labyrinth (12) is the labyrinth motive bearing, and last labyrinth (13) are labyrinth power oil ring.

8, polymeric kettle according to claim 4, it is characterized in that the gland sealed of axle envelope (4) at the bottom of filler (11) adopt high-elastic filler, labyrinth seal divides upper and lower two sections, following labyrinth (12) is the labyrinth motive bearing, last labyrinth (13) are labyrinth power oil ring.

9, according to claim 1 or 2 or 3 described polymeric kettles, it is characterized in that chuck (3) is provided with radiating fin (14) near importing and exporting, the chuck middle part is provided with radiating fin (14) and spiral deflector (15).

10, polymeric kettle according to claim 4 is characterized in that chuck (3) is provided with radiating fin (14) near importing and exporting, and the chuck middle part is provided with radiating fin (14) and spiral deflector (15).