RU231233U1 - CATALYST FEED ROD - Google Patents

Abstract

The claimed solution relates to the field of apparatuses for carrying out general-purpose chemical or physical processes carried out in the presence of liquid or gas and solid particles, in particular to elements of a catalyst feed unit. A catalyst feed rod has been developed, consisting of an outlet tube, a connecting ring, a fittings unit, and an inner tube input unit connected in series, characterized in that the connecting ring is screwed onto the end of the outlet tube and connected to the fittings unit, an inner tube input unit is installed at the other end of the fittings unit, wherein the fittings unit contains a three-way ball valve made with the possibility of passing the inner tube and feeding ethylene, the inner tube input unit contains a check valve. The technical result consists in ensuring reliable operation of the catalyst feed unit due to an improved housing design. 2 fig.

Description

The field of technology to which the solution relates

The claimed solution relates to the field of apparatus for carrying out general-purpose chemical or physical processes carried out in the presence of liquid or gas and solid particles, in particular to elements of a catalyst input unit.

State of the art

A solution is known (US11976140B2), which discloses a catalyst inlet unit comprising a catalyst inlet unit body and an internal tube through which liquid catalyst is supplied.

However, this solution does not disclose the details of the implementation of the catalyst input unit housing, in particular, it does not describe the means for increasing the reliability of its operation.

A solution selected as a prototype is known (RU 2441882 C2), which contains a nozzle used for injecting a liquid catalyst, a catalyst suspension or mixtures thereof into a reactor for gas-phase polymerization of olefins, comprising: a first tube containing a body, a tapering section and an injection end; a second tube having an internal surface and an external surface, and wherein the second tube contains a plurality of openings, radially and axially spaced along it, wherein the first tube is located around the second tube, forming a first annular space between them; and a supporting element, at least partially located around the external surface of the first tube, forming a second annular space between them, wherein one or a plurality of radial struts are located in the second annular space, wherein this supporting element has a converging external surface at its first end.

However, this solution does not disclose the details of the implementation of the catalyst input unit housing, in particular, it does not describe the means for increasing the reliability of its operation.

Disclosure of the declared solution

In one aspect of the claimed solution, a catalyst feed rod is disclosed, consisting of an outlet tube, a connecting ring, a fitting assembly, and an inner tube input assembly, all connected in series, characterized in that

the connecting ring is screwed onto the end of the outlet tube and connected to the fittings unit, at the other end of the fittings unit an input unit for the inner tube is installed, and

the valve assembly contains a three-way ball valve designed to allow passage of an internal tube and supply of ethylene, the internal tube input assembly contains a check valve.

In additional aspects, it is disclosed that the check valve is a spring-loaded flap configured to open upon insertion of the inner tube and to close under the action of a torsion spring after removal of the inner tube.

3. The rod according to claim 1, in which the connecting ring and the fittings unit are connected via a gasket made of thermally expanded graphite; the flap is designed with the possibility of rotation on the axis of the torsion spring and displacement into the expansion made in the inner tube input unit; the fittings unit contains an outlet for bleeding gas when the inner tube is removed.

The main task solved by the declared solution is to ensure reliable operation of the catalyst feed rod by improving the housing design.

The essence of the claimed solution is that the housing contains a check valve at its inlet for introducing an internal tube for feeding the catalyst and contains a ball valve for simultaneously introducing the internal tube and purging with ethylene.

The technical result achieved by the claimed solution consists in ensuring reliable operation of the catalyst feed unit and, in particular, the catalyst feed rod by improving the design of the housing.

Brief description of the drawings

Fig. 1 shows a sectional view of the catalyst feed rod.

Fig. 2 shows an axonometric view of the catalyst feed rod.

Implementation of the declared decision

The proposed solution is a structurally and functionally unified device. All elements of the device are located in one housing and are connected to each other directly or indirectly by means of a functional connection. The only function of the declared device is to ensure the possibility of feeding the catalyst into the reactor.

A functional connection of elements should be understood as a connection that ensures the correct interaction of these elements with each other and the implementation of one or another functionality of the elements. Particular examples of a functional connection may be a connection with the ability to transmit mechanical movement, a connection with the ability to rotate or pivot, a connection with the ability to specify a location, etc. The specific type of functional connection is determined by the nature of the interaction of the mentioned elements, and, unless otherwise specified, is provided by widely known means, using widely known principles in technology.

The proposed solution is a housing for a liquid catalyst input unit (rod) into a polymerization reactor. The liquid catalyst input unit is a housing, inside which there is an internal tube through which the catalyst and inert gas for spraying the catalyst are supplied, and ethylene is supplied through the space between the housing and the internal tube. The internal tube may have any suitable design, for example, as described in the prototype. The features of the internal tube are not considered in this application, since they do not relate to the essence of the claimed solution.

Fig. 1 shows a section of the feed unit without the inner tube (the rod is shown), and Fig. 2 shows an axonometric view of the rod, on which:

101 – input element for inserting the inner tube,

102 – check valve,

103 – connector,

104 – drainage element used to relieve pressure when removing the inner tube;

105 – connector,

106 – ethylene supply element,

107 – outer flange,

108 – expanded graphite gasket,

109 – connector,

110 – expanded graphite gasket,

111 – reactor flange,

112 – outlet pipe.

The claimed device structurally consists of a plurality of elements connected to each other by means of assembly operations. The input element 101 in form represents one or two connected cylinders with a flange at the output end (hereinafter, the output is the part from which the inner tube emerges when it is installed in the housing), by means of a flange connection through a seal it is connected to the connector 103.

Connector 103 is shaped as a cylinder with a flange at the input end, it is connected to element 104, shaped as a right parallelepiped with a square base. For connection with element 104, connector 103 has an external thread, and element 104 has a corresponding internal thread, which allows element 103 to be screwed into element 104. A sealing ring is used to ensure the sealing of the connection.

Element 104 is connected by means of a threaded connection to connector 105, which is shaped as a cylinder with two flanges on opposite sides. Connector 105, element 106, flange 107, gasket 108, connector 109 are connected to each other by means of threaded connections. Element 106 is a cylinder with a three-way ball valve and an inlet for feeding ethylene. Connector 109 is a support ring, which is connected with the end face of flange 107, and is connected with the outlet tube 112 by an internal thread.

Element 104 contains an opening on one of its faces and corresponding devices for releasing pressure at the moment of removing the inner tube, which increases the reliability of the catalyst supply unit due to the fact that the inner tube does not fly out during removal, is not damaged itself and does not damage the housing.

To install the claimed device in the reactor, the internal flange 111 of the reactor is used, which is connected with the external flange 107 using bolts. To seal the connection, the gasket 110 is used. After fixing the housing in the reactor, the internal tube is inserted into it, and sources of inert gas, monomer and catalyst are connected to the rod. The supply of inert gas and liquid catalyst leads to the spraying of the catalyst into the reactor, where ethylene is simultaneously supplied. In this case, conditions for the polymerization of ethylene are created in the reactor. After all components are introduced in the required quantity, the internal tube is removed from the housing.

The input of the inner tube is carried out through the input element 101, containing a check valve 102. The check valve 102 is necessary to prevent the gas mixture from exiting the rod after the inner tube is removed. In the absence of a check valve 102, after the inner tube is removed, the gas mixture moves through the housing, polymerizing along the way and clogging it.

Element 106 is a three-way ball valve that allows the inner tube to be passed through and ethylene to be fed into the reactor at the same time. After the inner tube has been removed, the valve is closed to reduce the gas mixture from entering the housing inlet. Preferably, this valve allows the housing to be purged with ethylene while the ball opening toward the housing inlet is closed.

Detailed description of the body elements

The input element 101 for introducing the inner tube is a metal cylinder with a flange at the end. Along the axis of the element 101, there is a hole for introducing the inner tube. To increase the reliability of the rod (reduce polymerization inside its body), the element 101 contains a check valve 102. Also, the element 101 contains a sealing ring that allows the inner tube to pass through it, but ensures tight contact with the inner tube and minimizes the possibility of gas movement towards the body inlet.

The check valve 102 opens under the pressure of the inserted inner tube, and closes tightly after its withdrawal. Preferably, the check valve 102 closes under the action of a torsion spring. This spring is designed to ensure the possibility of opening the valve 102 when the inner tube is inserted. For this purpose, the element 101 comprises an expansion in the part distal to the input. The locking disk of the valve 102 is retracted into this expansion when the inner tube is inserted.

Connector 103, element 104, connector 105, element 106, flange 107 are called here a fittings unit that connects the input and output parts of the rod.

Connector 103 is a metal cylinder with a flange for connection with element 101. The cylinder at the end opposite the flange contains an external thread for connection with element 104. To seal the connection, both the flange side and the thread side contain sealing rings, which reduces the possibility of movement of the gas mixture towards element 101 and the fouling of the internal space of the housing with polymers.

Element 104 is made in the form of a straight metal parallelepiped, which allows it to be mounted using a wrench, which in turn allows precise control of the tightening force and does not damage the thread, ensuring higher reliability of the entire device. Element 104 contains an internal thread at the input and a cylindrical protrusion with an external thread at the output. In the application, "input" means the side of the through hole from which the inner tube is inserted.

Connector 105 is a metal cylinder with two flanges. It serves to connect element 104 with element 106.

Flange 107 serves to secure the housing to the reactor wall using reactor flange 111.

Connector 105, element 106, flange 107, connector 109 are connected together using studs. For a tight connection, seals are installed between the mentioned parts of the housing. Moreover, due to the high temperature in the reactor, seals 108 and 110 are made of thermally expanded graphite. Which increases the reliability of the declared device.

Connector 109 is a metal cylinder with a diameter that allows it to be placed between the bolts connecting flanges 107 and 111. This solution increases the reliability of the connection of the body elements, since it allows not to adjust connector 109 to flanges 107 and 111. Connector 109 contains an internal thread for connection to outlet pipe 112 and holes for connection to flange 107 by element 106 and connector 105 by means of studs.

Tube 112 is a cylinder designed to introduce a gas mixture into the reactor. At the inlet, the cylinder has an external thread for connection to connector 109 and optionally to flange 107 (through an expansion in flange 107). The junction of flange 107 and tube 112 is preferably sealed using a heat-resistant sealing ring. At the outlet, the radius of the cylinder gradually decreases to make it easier to introduce the housing into the reactor and to reduce polymer adhesion.

The tube 112 may comprise spacers for centering the position of the inner tube.

The tube 112 may contain cuts on the outer surface to ensure the possibility of tightening it with a wrench. Preferably, the cuts are located in the immediate vicinity of the connector 109 to reduce deformations along the length of the tube 112 when tightening. Such a solution increases the reliability of the housing and the entire catalyst input unit.

Description of the operation of the declared solution

The rod is assembled at the manufacturing plant using standard industrial operations (cutting, drilling, turning, milling, threaded connection, etc.), installed in the reactor, and the inner tube is placed in it. Catalyst, inert gas, and ethylene sources are connected to the rod, and fluids are fed into the reactor in specified quantities. After the feed is complete, the inner tube is removed, the three-way ball is closed, and valve 102 is closed.

Construction materials

Any of the above elements, except for the gaskets, seals, etc., may be made of any material that is not reactive under the selected polymerization conditions. Suitable materials include, but are not limited to, aluminum, aluminum bronze, gastaloy, inconel, monel, chromium carbide, boron carbide, cast iron, ceramics, copper, nickel, silicon carbide, tantalum, titanium, zirconium, tungsten carbide, and certain polymer compositions. Stainless steel is particularly preferred.

The embodiments are not limited to the embodiments described herein; other embodiments will become apparent to a person skilled in the art based on the information provided in the description and knowledge of the prior art, without departing from the spirit and scope of this solution.

Elements mentioned in the singular do not exclude a plurality of elements unless otherwise specifically stated.

The methods disclosed herein comprise one or more steps or actions to achieve the described method. The steps and/or actions of the method may replace each other without going beyond the scope of the utility model formula. In other words, if a specific order of steps or actions is not specified, the order and/or use of specific steps and/or actions may be changed without going beyond the scope of the utility model formula.

The application does not specify specific software and hardware for implementing the elements in the drawings, but a person skilled in the art should understand that the essence of the utility model is not limited to a specific software or hardware implementation, and therefore any software and hardware known in the art may be used to implement the utility model. Thus, the hardware may be implemented in one or more specialized integrated circuits, digital signal processors, digital signal processing devices, programmable logic devices, user-programmable gate arrays, processors, controllers, microcontrollers, microprocessors, electronic devices, other electronic modules designed to perform the functions described in this document, a computer or a combination of the above.

Although exemplary embodiments have been described in detail and shown in the accompanying drawings, it should be understood that such embodiments are illustrative only and are not intended to limit the broader utility model, and that the present solution should not be limited to the specific arrangements and structures shown and described, since various other modifications may be apparent to those skilled in the art.

The features mentioned in various dependent claims, as well as the implementations disclosed in various parts of the description, can be combined to achieve useful effects, even if the possibility of such a combination is not explicitly disclosed.

Claims (7)

1. A catalyst feed rod consisting of an outlet tube, a connecting ring, a fitting unit, and an inner tube input unit connected in series, characterized in that the connecting ring is screwed onto the end of the outlet tube and connected to the fittings unit, at the other end of the fittings unit an input unit for the inner tube is installed, and the valve assembly contains a three-way ball valve designed to allow passage of an internal tube and supply of ethylene, the internal tube input assembly contains a check valve. 2. The rod according to claim 1, in which the check valve is a spring-loaded flap, designed with the possibility of opening when the inner tube is inserted and closing under the action of a torsion spring after the inner tube is removed. 3. A rod according to claim 1, in which the connecting ring and the fittings unit are connected via a gasket made of thermally expanded graphite. 4. The rod according to item 2, in which the sash is designed with the possibility of rotation on the axis of the torsion spring and displacement into the expansion made in the input unit of the inner tube. 5. The rod according to claim 1, in which the fittings assembly comprises an outlet for releasing gas when the inner tube is removed.