Alkyl aluminum injection device

Abstract

The utility model discloses an aluminum alkyl injection device and aims to solve the problems that an injection nozzle is easy to block and difficult to clean in the prior art. The device comprises a pipe nozzle assembly, wherein a first channel and a second channel which are communicated with each other are arranged in the pipe nozzle assembly; the aluminum alkyl feeding assembly is fixedly connected with the pipe nozzle assembly, and an aluminum alkyl injection channel of the aluminum alkyl feeding assembly intersects with the first channel at an acute angle, so that carrier gas is used for primary atomization; the three-way valve is detachably connected to the rear part of the pipe nozzle assembly and is used for switching a normal injection mode and a blockage clearing mode; and the unblocking overhauling assembly is connected to the rear end of the three-way valve, is composed of a second connecting piece and a detachable blind head, and is used for sealing the system under normal working conditions and providing a straight line entering channel of an unblocking tool when needed. According to the device, aluminum alkyl can be effectively scattered into mist in the pipe nozzle assembly, the mist aluminum alkyl is quickly dispersed after being injected into a reactor to initiate reaction, and the injection pipe nozzle is prevented from being blocked.

Description

Technical Field

[0001] This utility model relates to the technical field of polyolefin chemical production equipment, specifically to an alkyl aluminum injection device. Background Technology

[0002] In polyolefin chemical production, alkyl aluminum is a very important chemical additive. In the gas-phase polyethylene production process, alkyl aluminum acts as a co-catalyst for certain catalyst groups, initiating chemical reactions. Therefore, polyolefin polymerization reactors are equipped with dedicated alkyl aluminum inlets, injecting alkyl aluminum into the reactor in liquid form. Through the full mixing of the fluidized bed within the reactor, the alkyl aluminum is evenly dispersed. The alkyl aluminum contacts the catalyst and comonomers in the reactor and initiates a reaction, generating polyolefin powder particles. However, since alkyl aluminum enters the reactor in a spray-like manner, its concentration is highest upon entry, maximizing the probability of initiating a reaction. Once a reaction occurs at the outlet of the inlet, generating polyolefin particles, it can easily clog the inlet. All reaction feeds must be stopped, and production can only resume after manual intervention to clear the blockage. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the existing technology, the present invention provides an alkyl aluminum injection device to solve the problem that alkyl aluminum injection into the reactor can easily trigger a reaction that generates polyolefin particles that clog the injection port.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] This utility model provides an alkyl aluminum injection device, characterized in that it includes:

[0006] The nozzle assembly consists of an injection nozzle and a first connector fixedly connected to the rear end of the injection nozzle. The injection nozzle and the first connector are respectively provided with a first channel and a second channel that are distributed and connected through their respective length directions. The diameter of the second channel is larger than the diameter of the first channel.

[0007] An alkyl aluminum feed assembly is fixedly connected to a first connector and has an alkyl aluminum injection channel inside. The alkyl aluminum injection channel is connected to a second channel and the two are distributed at an acute angle in the direction from back to front.

[0008] A three-way valve is detachably and fixedly connected to the rear end of the first connector. The three-way valve has a first inlet, a second inlet and a first outlet. The first outlet is connected to the second channel and the second inlet is the carrier gas inlet.

[0009] The unblocking and maintenance component consists of a second connector and a blind head connected sequentially from front to back to the three-way valve. The second connector has a third channel inside that is connected to the first inlet of the three-way valve. The blind head is detachably and fixedly connected to the second connector and is used to block the third channel.

[0010] Furthermore, a reactor connection flange is also fixedly connected to the first connector.

[0011] Furthermore, a transition reduction section is provided at the connection between the first channel and the second channel.

[0012] Furthermore, the angle between the alkyl aluminum injection channel line and the second channel axis is 45° to 60°.

[0013] Furthermore, the length of the injection nozzle is one-quarter to one-third of the reactor's inner diameter.

[0014] Furthermore, sealing gaskets are provided between the first connector and the three-way valve, and between the three-way valve and the second connector.

[0015] Furthermore, an O-ring is provided between the blind head and the third channel.

[0016] Furthermore, the first connector and the three-way valve and the second connector, as well as the blind head and the second connector, are detachably and fixedly connected by bolts.

[0017] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0018] 1. The angle design between the alkyl aluminum injection channel and the second channel, and the narrowing structure between the second channel and the first channel, can break the liquid alkyl aluminum into droplets and mix them evenly. As a result, the liquid aluminum is dispersed into a mist by the rising airflow in the reactor at the injection nozzle, which fully atomizes the alkyl aluminum and reduces the local concentration when it enters the reactor, thus avoiding the generation of polyolefin particles that could cause blockage at the injection port.

[0019] 2. With the three-way valve, the second connector, and the blind head, when the injection nozzle becomes blocked, the inside of the injection nozzle can be cleared by disassembling the blind head and connecting a clearing tool without disassembling the entire structure, making the operation convenient.

[0020] 3. All components are detachable, which facilitates inspection and replacement and effectively reduces maintenance costs;

[0021] 4. Sealing elements are provided between the three-way valve and the first and second connecting parts, and between the blind head and the second connecting part, to improve the overall sealing effect and prevent safety hazards caused by alkyl aluminum leakage. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 2 This is an exploded three-dimensional structural diagram of the present invention;

[0025] Figure 3 This is the front view of the present utility model.

[0026] in:

[0027] 1-Injection nozzle, 101-First channel;

[0028] 2-First connector, 201-Second channel;

[0029] 3-alkylaluminum feed assembly, 301-alkylaluminum injection channel;

[0030] 4-Reactor connection flange;

[0031] 5 - Three-way valve; 501 - Carrier gas inlet;

[0032] 6-Second connector, 601-Third channel;

[0033] 7-Blind head; 8-Sealing gasket; 9-O-ring seal. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0035] like Figures 1-3 As shown, this utility model provides an alkyl aluminum injection device, including an injection nozzle 1, a first connector 2, a three-way valve 5, a second connector 6, and a blind head 7 connected sequentially from front to back. An alkyl aluminum feed assembly 3 is fixedly connected to one side of the first connector 2, and a reactor connecting flange 4 is coaxially fixedly connected to the outer wall of the front end of the first connector 2.

[0036] Specifically, the injection nozzle 1, the first connector 2, and the reactor connecting flange 4 are integrally formed, constituting a nozzle assembly. The injection nozzle 1 and the first connector 2 each have a first channel 101 and a second channel 201 distributed and connected along their respective axes. The first channel 101 and the second channel 201 pass through the injection nozzle 1 and the first connector 2 respectively, with the diameter of the second channel 201 being larger than that of the first channel 101. A transition section with a reduced diameter is provided at the connection point, such as... Figure 3 As shown; the reactor connecting flange 4 is coaxially fixedly connected to the front end of the outer side wall of the first connecting piece 2. The reactor connecting flange 4 is provided with multiple sets of mounting holes for detachable connection with the mating flange on the reactor by fasteners.

[0037] The alkyl aluminum feed assembly 3 is fixedly connected to the first connector 2. It has an alkyl aluminum injection channel 301 inside. One end of the alkyl aluminum injection channel 301 is connected to the second channel 201, and the other end is connected to the external environment to facilitate the injection of alkyl aluminum. The axis of the alkyl aluminum injection channel 301 is distributed at an acute angle to the second channel 201 in the front-back direction. In this embodiment, the included angle between the two is set to 45° to 60°, which is the best effect for the alkyl aluminum to be dispersed into droplets by the carrier gas. In addition, the length of the injection nozzle 1 is one-quarter to one-third of the inner diameter of the reactor, so that the droplet-shaped alkyl aluminum can be more easily and quickly dispersed into the reactor after entering the reactor.

[0038] The three-way valve 5 is connected to the rear end of the first connecting member 2. It is a two-position three-way manual switching valve with a first inlet, a second inlet, and a first outlet. The first inlet is used to connect to the third channel 601 on the second connecting member 6. The second inlet is the air carrier port 501. The first outlet is connected to the second channel 201. In addition, the three-way valve 5 is also equipped with a rotating handle to manually control two working states: the first inlet is connected to the first outlet, or the second inlet is connected to the first outlet.

[0039] The second connecting piece 6 is fixedly connected to the rear end of the three-way valve 5. It has a third channel 601 that runs through the front and rear of the three-way valve 5. The third channel 601 is connected to the first inlet of the three-way valve 5. Mounting holes are provided at both the front and rear ends of the second connecting piece 6. Mounting holes are provided between the second connecting piece 6, the three-way valve 5, and the first connecting piece 2. The three are detachably fixedly connected by bolts. Sealing gaskets 8 are provided between the first connecting piece 2 and the three-way valve 5, and between the three-way valve 5 and the second connecting piece 6 for sealing.

[0040] The blind head 7 is located at the rear end of the second connector 6. The front end of the blind head 7 is provided with a boss for engaging with the third channel 601, thereby blocking the third channel 601. An O-ring 9 is provided between the boss and the third channel 601 for sealing. There are correspondingly distributed mounting holes between the rear ends of the blind head 7 and the second connector 6. The two are also detachably fixedly connected by bolts.

[0041] When the device is in operation, it is first fixed to the matching flange on the reactor via the reactor connecting flange 4. At this time, the second inlet of the three-way valve 5 is connected to the first outlet, and the first inlet is blocked, that is, the carrier gas inlet 501 is connected to the second channel 201. Alkyl aluminum enters the interior of the second channel 201 through the alkyl aluminum injection channel 301, while the carrier gas enters through the carrier gas inlet 501 and mixes with the alkyl aluminum along the second channel 201. Due to the angle between the alkyl aluminum injection channel 301 and the second channel 201, the liquid alkyl aluminum is dispersed into droplets by the carrier gas at the mixing point and continues to move forward. After the diameter is narrowed, it enters the first channel 101 at a faster flow rate and finally enters the interior of the reactor. The droplet-shaped alkyl aluminum is dispersed into a mist by the rising airflow of the reactor and quickly dispersed throughout the entire reactor.

[0042] Liquid alkylaluminum is mixed with the carrier gas in the second channel 201 at a certain angle for primary atomization. The strong shearing impact of the high-speed carrier gas breaks the liquid flow into coarser droplets. When the gas-liquid mixture is forced through the narrowed section at the connection between the second channel 201 and the first channel 101, the resulting fluid acceleration (Venturi effect) and turbulence further break up the droplets, resulting in secondary atomization. The droplets are then dispersed again by the rising gas flow of the reactor at the front end of the injection nozzle 1, thus enabling them to be rapidly and uniformly dispersed into the gas phase of the reactor. This maximizes the reaction surface area of ​​alkylaluminum, avoiding the "hot spots" or polymer agglomeration problems caused by excessively high local catalyst concentration, improving reaction efficiency, and making the polymer properties more uniform.

[0043] If the first channel 101 becomes blocked, turn the handle of the three-way valve 5 to connect the first inlet to the first outlet, block the carrier gas inlet 501, and simultaneously block the alkyl aluminum injection channel 301. Then, remove the blind head 7 and connect an external cleaning tool, such as a liquid or gas flushing pipe, to the third channel 601. The external cleaning liquid or gas enters the second channel 201 and the first channel 101 to remove the blockage and flow into the reactor. After the blockage is cleared, turn the handle to connect the carrier gas inlet 501 of the three-way valve 5 to the first outlet, and install the blind head 7 and remove the sealing parts of the alkyl aluminum injection channel 301.

[0044] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. An alkyl aluminum injection device, characterized in that, include: The nozzle assembly consists of an injection nozzle and a first connector fixedly connected to the rear end of the injection nozzle. The injection nozzle and the first connector are respectively provided with a first channel and a second channel that are distributed and connected through their respective length directions. The diameter of the second channel is larger than the diameter of the first channel. An alkyl aluminum feed assembly is fixedly connected to a first connector and has an alkyl aluminum injection channel inside. The alkyl aluminum injection channel is connected to a second channel and the two are distributed at an acute angle in the direction from back to front. A three-way valve is detachably and fixedly connected to the rear end of the first connector. The three-way valve has a first inlet, a second inlet and a first outlet. The first outlet is connected to the second channel and the second inlet is the carrier gas inlet. The unblocking and maintenance component consists of a second connector and a blind head connected sequentially from front to back to the three-way valve. The second connector has a third channel inside that is connected to the first inlet of the three-way valve. The blind head is detachably and fixedly connected to the second connector and is used to block the third channel.

2. The alkylaluminum injection device according to claim 1, characterized in that, A reactor connection flange is also fixedly connected to the first connector.

3. The alkylaluminum injection device according to claim 1, characterized in that, A transition section with a reduced diameter is provided at the connection between the first channel and the second channel.

4. The alkylaluminum injection device according to claim 1, characterized in that, The angle between the alkylaluminum injection channel line and the second channel axis is 45° to 60°.

5. The alkylaluminum injection device according to claim 1, characterized in that, The length of the injection nozzle is one-quarter to one-third of the reactor's inner diameter.

6. The alkylaluminum injection device according to claim 1, characterized in that, Sealing gaskets are provided between the first connector and the three-way valve, and between the three-way valve and the second connector.

7. The alkylaluminum injection device according to claim 1, characterized in that, An O-ring is provided between the blind head and the third channel.

8. The alkylaluminum injection device according to claim 1, characterized in that, The first connector is detachably and fixedly connected to the three-way valve and the second connector, and the blind head is detachably and fixedly connected to the second connector by bolts.

Images