Temperature measuring device of gas-phase polypropylene reactor

Abstract

The utility model relates to a temperature measuring device of a gas phase polypropylene reactor, which comprises a reactor connecting pipe, a protective sleeve and a sealing ring, the top of the reactor connecting pipe is connected with the protective sleeve through a flange, and the reactor connecting pipe wraps the periphery of the protective sleeve; the bottom of the reactor adapter is inserted into the reactor; the reactor connecting pipe is a cylinder with two open ends, and the sealing rings are hooped on the protective sleeve; the inner wall of the end, provided with the opening, of the protective sleeve is provided with threads, and the outer wall of the end, provided with the opening, of the protective sleeve is connected with a flange. The unopened end is a temperature measuring end and is provided with a thin-wall bidirectional blade structure; according to the utility model, by improving the temperature measurement accuracy, the influence of temperature measurement on control fluctuation is solved, so that the production of a polypropylene device can reach a long, stable and excellent state; and the temperature measuring device is detachable, so that the difficulty in installation and maintenance can be solved, and the maintenance is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of temperature measurement of polypropylene reactors, and specifically relates to a temperature measuring device for a gas phase polypropylene reactor. Background Art

[0002] 1. Existing technical solutions:

[0003] In the process of producing PP resin using a gas phase polypropylene (PP) device, in order to prevent gas leakage and powder abrasion, the temperature measuring device generally uses a thick-walled cylinder and is directly welded to the reactor.

[0004] 2. Problems with existing technologies:

[0005] Since the blade agitator of the gas phase polypropylene reactor cannot fully mix the powder, and local hot spots are generated due to material level and temperature fluctuations, the temperature control is not good, which easily leads to problems such as short continuous production cycle, low load, and easy agglomeration of powder. The temperature measuring device of the thick-walled cylinder is more likely to cause measurement errors and delays. The production of polymers will produce strips and lumps, causing accumulation of materials on the thermocouple sleeve, further exacerbating the measurement difficulties. At the same time, the temperature measuring device is welded and installed in one piece, making it difficult to replace and repair the device. Utility Model Content

[0006] 1. Technical issues to be resolved

[0007] The purpose of the utility model is to provide a temperature measuring device for a gas phase polypropylene reactor in view of the above-mentioned problems existing in the prior art, which can solve the influence of temperature measurement on control fluctuation by improving the temperature measurement accuracy, so that the production of the polypropylene device can reach a long, stable and excellent state; and the temperature measuring device is detachable, which can solve the difficulties of installation and maintenance and is convenient for maintenance.

[0008] (II) Technical solution

[0009] The utility model discloses a temperature measuring device for a gas phase polypropylene reactor, comprising a reactor pipe, a protective sleeve and a sealing ring, wherein the top of the reactor pipe is connected with the protective sleeve through a flange, and the reactor pipe is wrapped around the periphery of the protective sleeve; the bottom of the reactor pipe is inserted into the reactor; the reactor pipe is a cylinder with openings at both ends, and the sealing ring is a plurality of sealing rings clamped on the protective sleeve; the protective sleeve is a cylinder with an opening at one end, wherein the inner wall of the end with the opening is provided with threads, and the outer wall is connected with a flange; the unopened end is a temperature measuring end, and the end has a thin-wall bidirectional blade structure.

[0010] Wherein, the outer wall of the protection sleeve is provided with a plurality of sealing ring grooves for fixing the sealing ring in a position adapted to the protection sleeve.

[0011] The diameter of the sealing ring is equal to the inner diameter d3 of the reactor pipe, and is used to prevent the high-pressure material in the reactor from leaking into the gap between the reaction pipe and the protective sleeve.

[0012] Among them, the inner diameter d1 of the protective sleeve is slightly larger than the size of the temperature sensor probe so that the temperature sensor probe can be smoothly inserted. The length L2 of its internal cavity can accommodate the insertion of the temperature sensor probe. The inner wall of one end of the opening of the protective sleeve is provided with a thread that can be adjusted to match the active length of the elastic connector provided on the temperature sensor probe.

[0013] (III) Beneficial effects

[0014] The advantages of the utility model are:

[0015] 1. The utility model improves the accuracy of temperature measurement, improves the accuracy and response speed of the temperature sensor through the thin wall at the end to accurately measure and control the flow and distribution of the quenching liquid into the reactor, solves the problem of reactor temperature fluctuation, and ensures the safe operation of the reactor in temperature fluctuations.

[0016] 2. The utility model improves the service life of the temperature measuring device by the blade shape structure in the reactor stirring powder; at the same time, the special shape has greater strength and is fixed by an elastic sealing ring, which increases the strength of the temperature measuring device and avoids the agitator in the gas phase polypropylene reactor pushing the material horizontally to damage the casing.

[0017] 3. The utility model improves the versatility and maintenance convenience of the temperature measuring device. The temperature measuring device is provided with the protective sleeve, and the temperature sensor is connected through the protective sleeve; temperature sensors of different sizes can be matched with the protective sleeves of different sizes to ensure that temperature sensors of different sizes can be stably installed in the protective sleeve. At the same time, the protective sleeve is fixed to the position to be detected through the reactor pipe; the size of the sealing ring can prevent the high-pressure material in the reactor from leaking into the gap between the reaction pipe and the protective sleeve, and prevent the high-pressure material from polymerizing and bonding between the reaction pipe and the protective sleeve so that the two cannot be separated; when the protective sleeve is damaged or corroded and needs to be replaced, it is also only necessary to replace the protective sleeve without replacing the entire sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 for Figure 1 A schematic diagram of a bottom view in the AA direction;

[0020] Figure 3 for Figure 1 An enlarged schematic diagram of the sealing ring groove at B (without sealing ring installed).

[0021] Figure 4 It is a schematic diagram of the sealing ring of the utility model.

[0022] In the figure:

[0023] 1. Reactor pipe; 2. Protective sleeve; 3. Reactor; 4. Protective sleeve thread; 5. Protective sleeve flange; 6. Reactor pipe flange; 7. Sealing ring; 8. Protective sleeve measuring end; 9. Thin-walled bidirectional blade structure; 10. Sealing ring slot; H, Reactor pipe height; L, Protective sleeve length; L1, Protective sleeve top length; L2, Protective sleeve internal cavity length; L3, Blade structure length; D1, Protective sleeve end outer diameter; D2, Protective sleeve outer diameter; D3, Reactor pipe outer diameter; d1, Protective sleeve inner diameter; d2, Sealing ring diameter; d3, Reactor pipe inner diameter; R, Blade chamfer radius; T, Protective sleeve top thickness; DETAILED DESCRIPTION

[0024] The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0025] As attached Figure 1-4 As shown:

[0026] The utility model discloses a temperature measuring device for a gas phase polypropylene reactor, comprising a reactor pipe, a protective sleeve and a sealing ring, wherein the top of the reactor pipe is connected with the protective sleeve through a flange, and the reactor pipe is wrapped around the periphery of the protective sleeve; the bottom of the reactor pipe is inserted into the reactor; the reactor pipe is a cylinder with openings at both ends, and the sealing ring is a plurality of sealing rings clamped on the protective sleeve; the protective sleeve is a cylinder with an opening at one end, wherein the inner wall of the end with the opening is provided with threads, and the outer wall is connected with a flange; the unopened end is a temperature measuring end, and the end has a thin-wall bidirectional blade structure.

[0027] The outer wall of the protection sleeve is provided with a plurality of sealing ring retaining grooves for retaining the sealing ring adapted to the protection sleeve.

[0028] The inner diameter d1 of the protective sleeve is slightly larger than the size of the temperature sensor probe so that the temperature sensor probe can be smoothly inserted. The length L2 of its internal cavity can accommodate the insertion of the temperature sensor probe. The inner wall of one end of the opening of the protective sleeve is provided with a thread that can be adjusted to match the active length of the elastic connector provided on the temperature sensor probe.

[0029] The open end of the protective sleeve is provided with a disc-shaped flange, with a through hole in the center, and the inner wall of the through hole is welded to the outer wall of the cylinder. The unopened end is the temperature measurement end, which has a reinforced structure of a thin-walled bidirectional blade, with a reduced outer diameter D1, a blade length L3, a blade angle of 45°, a blade chamfer radius R transitioning to the top, and a pressure-bearing top that is spherical, with a thickness of T and a top length of L1.

[0030] In the gas phase polypropylene process, for propylene homopolymerization, the reaction operating temperature is 55-80℃, the design temperature is 150℃, and the heat is 2417kJ / kg pp. If the heat is not removed, the temperature will rise rapidly by 22℃ within 10-15 minutes, and the melting point of 189℃ may be reached in a certain section of the reactor. The heat in the reactor is taken away by the vaporization of the quench liquid sprayed on the powder bed. The liquid phase vaporization heat is 276kJ / kg at a pressure of 2.25Mpag. The quench liquid is reasonably distributed on the pp particles to perform steady-state heat balance on the reacting single particles. Since too low a reactor temperature will cause the bed to wet and generate tile-like blocks, and too high a temperature will generate molten blocks, in order to maintain a stable operating temperature, the large amount of heat released by the exothermic polymerization reaction must be removed in time, so the temperature measurement and control requires rapid and accurate. The utility model reduces the wall thickness of the measuring end of the protective sleeve and improves the response speed of the temperature sensor to accurately measure the temperature fluctuation. At the same time, after the protective sleeve is installed, the direction of the blade will be parallel to the tangent direction of the reactor agitator rotation. The blade increases the strength of the measuring end to reduce the wall thickness, which can avoid the scouring of the sleeve by powder stirring.

[0031] The reactor pipe is a cylinder with openings at both ends, with a height of H, and a flange at one end of its outer wall adapted to the protective sleeve. The reactor pipe includes a variety of different models, the difference being the different wall thickness (according to the different design pressures of the reactor, the outer diameter D3 of the reactor pipe is designed), or the different inner wall size (according to the different sizes of the protective sleeve outer diameter D2, the inner diameter d3 of the reactor pipe is designed to be D2+2mm), or the different height (according to the different types of reactors, the reactor pipe height H is designed).

[0032] Representative embodiments of the present invention have been described in detail. These detailed descriptions are not intended to limit the scope of the present invention. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention to adapt to the sizes of temperature sensors of various brands and models on the market, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A temperature measuring device for a gas phase polypropylene reactor, characterized in that: It includes a reactor pipe, a protective sleeve and a sealing ring. The top of the reactor pipe is connected to the protective sleeve through a flange, and the reactor pipe is wrapped around the periphery of the protective sleeve; the bottom of the reactor pipe is inserted into the reactor; the reactor pipe is a cylinder with openings at both ends, and the sealing ring is a plurality of sealing rings clamped on the protective sleeve; the protective sleeve is a cylinder with an opening at one end, the inner wall of the end with the opening is provided with threads, and the outer wall is connected with a flange; the unopened end is a temperature measuring end, and this end has a thin-walled bidirectional blade structure.

2. The temperature measuring device for a gas phase polypropylene reactor according to claim 1, characterized in that: The outer wall of the protection sleeve is provided with a plurality of sealing ring clamping grooves for fixing the sealing ring in a position adapted to the protection sleeve.

3. The temperature measuring device for a gas phase polypropylene reactor according to claim 1, characterized in that: The diameter of the sealing ring is equal to the inner diameter (d3) of the reactor pipe, and is used to prevent the high-pressure material in the reactor from leaking into the gap between the reaction pipe and the protective sleeve.

4. The temperature measuring device for a gas phase polypropylene reactor according to claim 1, characterized in that: The inner diameter (d1) of the protective sleeve is slightly larger than the size of the temperature sensor probe so that the temperature sensor probe can be smoothly inserted. The length (L2) of its internal cavity can accommodate the insertion of the temperature sensor probe. The inner wall of one end of the opening of the protective sleeve is provided with a thread that can be adjusted to match the active length of the elastic connector provided on the temperature sensor probe.

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