Deslagging device for pre-polycondensation liquid seal tank

Abstract

The utility model discloses a pre-polycondensation liquid seal tank deslagging device which comprises a first pre-polycondensation liquid seal tank, the first pre-polycondensation liquid seal tank comprises an inner chamber and an outer chamber, the first pre-polycondensation liquid seal tank is provided with a top cover, the top cover is provided with a deslagging port, the bottom of the outer chamber is provided with a filter plate, the filter plate is provided with a plurality of overflow ports, and the overflow ports are communicated with the inner chamber and the outer chamber. A duplex filter basket is arranged in each overflow port; and a residue removal pipe is arranged above the filter plate, one end of the residue removal pipe penetrates through the residue removal opening to be connected with a residue collection barrel, the residue removal pipe is connected with a gear pump, and the gear pump conveys low-molecular residues in the outer chamber into the residue collection barrel. According to the utility model, the low-molecular residue in the outer chamber of the first pre-polycondensation liquid seal tank is pumped into the residue collecting barrel by using the gear pump, so that the circulation of ethylene glycol is ensured, and the breakdown of a vacuum system of the first pre-polycondensation reaction kettle is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of polyester production, in particular to a pre-condensation liquid sealing tank slag removal device. Background Art

[0002] The polycondensation process of polyester continuously generates ethylene glycol, and the polycondensation reaction itself is a reversible reaction. If the generated ethylene glycol is not removed in time, the reaction will not proceed, or even degrade, so that the molecular weight of the product cannot meet the production requirements. In the process of ethylene glycol removal, the polycondensation reaction is in a decompression state, which will cause low-molecular entrainment. Due to the existence of low-molecular entrainment, the outer chamber in the first pre-polycondensation liquid seal tank will have low-molecular residues when ethylene glycol flows through. The low-molecular will stick to the wall of the outer chamber over time and clump. When the low-molecular block is large enough, it will fall off naturally. As the ethylene glycol flows to the filter, it will block the filter basket and cause the ethylene glycol to stop flowing, causing the ethylene glycol sprayed by the scraper condenser to disappear, and the tail gas of the reactor cannot be cooled, causing the tail gas temperature to exceed 60°C and flow into the liquid ring vacuum pump. The liquid ring vacuum pump loses its vacuum extraction function because the tail gas temperature exceeds 60°C, which causes the vacuum system of the first pre-polycondensation reactor to collapse, so it is necessary to regularly remove the slag from the first pre-polycondensation liquid seal tank. In the prior art, when low molecular weight residues are deposited and agglomerated in the outer chamber of the first precondensation liquid sealing tank, manual slag removal is usually used. Manual slag removal is not only time-consuming and labor-intensive, but also has the problem that the net bag is too large to reach the bottom of the outer chamber.

[0003] Based on the above situation, the utility model proposes a pre-condensation liquid sealing tank slag removal device, which can effectively solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a pre-condensation liquid sealing tank slag removal device. The utility model provides a pre-condensation liquid sealing tank slag removal device, which uses a gear pump to extract the low molecular weight residue in the outer chamber of the first pre-condensation liquid sealing tank into a residue collection bucket to ensure the circulation of ethylene glycol, thereby preventing the vacuum system of the first pre-condensation reactor from collapsing. Compared with the existing manual slag removal, it has the advantages of being timely, safe, efficient and comprehensive, and also solves the problem of manual slag removal that the net bag is too large to reach the bottom of the outer chamber.

[0005] The utility model is realized by the following technical solutions:

[0006] A pre-condensation liquid sealing tank slag removal device comprises a first pre-condensation liquid sealing tank, wherein the first pre-condensation liquid sealing tank comprises an inner chamber and an outer chamber, the first pre-condensation liquid sealing tank is provided with a top cover, the top cover is provided with a slag removal port, a filter plate is provided at the bottom of the outer chamber, a plurality of overflow ports are provided on the filter plate, and a double filter basket is provided in each overflow port; a slag removal pipe is provided above the filter plate, one end of the slag removal pipe passes through the slag removal port and is connected to a residue collection barrel, a gear pump is connected to the slag removal pipe, and the gear pump transports low molecular weight residues in the outer chamber to the residue collection barrel.

[0007] According to the above technical solution, as a further preferred technical solution of the above technical solution, a check valve is connected to the slag removal pipe.

[0008] According to the above technical solution, as a further preferred technical solution of the above technical solution, an EG output pipe is provided at the bottom of the first pre-condensation liquid sealing tank, and the EG output pipe is communicated with the outer chamber.

[0009] According to the above technical solution, as a further preferred technical solution of the above technical solution, two slag removal ports are provided, and the two slag removal ports are symmetrically arranged on the horizontal axis of the top cover.

[0010] According to the above technical solution, as a further preferred technical solution of the above technical solution, a through hole is opened in the middle of the top cover, and a plurality of hole covers are arranged around the top cover, and the plurality of hole covers are symmetrically distributed on both sides of the line connecting the two slag removal ports.

[0011] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0012] The utility model provides a pre-condensation liquid sealing tank slag removal device, which uses a gear pump to extract low molecular weight residues in the outer chamber of the first pre-condensation liquid sealing tank into a residue collection bucket to ensure the circulation of ethylene glycol, thereby preventing the vacuum system of the first pre-condensation reactor from collapsing. Compared with the existing manual slag removal, it has the advantages of being timely, safe, efficient and comprehensive, and also solves the problem that the net bag cannot penetrate into the bottom of the outer chamber due to the large size of the manual slag removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is a structural schematic diagram of the top cover of the utility model. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the technical solution of the utility model, the preferred implementation scheme of the utility model is described below in conjunction with specific embodiments. However, it should be understood that the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only used for illustrative purposes and cannot be understood as a limitation on this patent.

[0016] Embodiment 1:

[0017] A precondensation liquid sealing tank slag removal device comprises a first precondensation liquid sealing tank 1, wherein the first precondensation liquid sealing tank 1 comprises an inner chamber 11 and an outer chamber 12, wherein the first precondensation liquid sealing tank 1 is provided with a top cover 13, wherein the top cover 13 is provided with a slag removal port 131, wherein a filter plate 14 is provided at the bottom of the outer chamber 12, wherein a plurality of overflow ports 141 are provided on the filter plate 14, wherein each overflow port 141 is provided with a double filter basket 15; wherein a slag removal pipe 2 is provided above the filter plate 14, wherein one end of the slag removal pipe 2 passes through the slag removal port 131 and is connected to a residue collecting barrel 3, wherein a gear pump 4 is connected to the slag removal pipe 2, wherein the gear pump 4 transports the low molecular weight residue in the outer chamber 12 to the residue collecting barrel 3.

[0018] The utility model uses a gear pump 4 to extract the low molecular weight residues in the outer chamber 12 of the first precondensation liquid sealing tank 1 into the residue collection barrel 3 to ensure the circulation of ethylene glycol, thereby preventing the vacuum system of the first precondensation reactor from collapsing. Compared with the existing manual slag removal, the utility model has the advantages of being timely, safe, efficient and comprehensive, and also solves the problem that the net bag cannot penetrate into the bottom of the outer chamber due to being too large.

[0019] Furthermore, in another embodiment, the slag removal pipe 2 is connected with a check valve 5. By providing the check valve 5, the low molecular weight residue in the residue collection barrel 3 is prevented from flowing back to the outer chamber 12 of the first pre-condensation liquid sealing tank 1 to cause deposition.

[0020] Furthermore, in another embodiment, an EG output pipe 6 is disposed at the bottom of the first pre-condensation liquid seal tank 1 , and the EG output pipe 6 is communicated with the outer chamber 12 .

[0021] Furthermore, in another embodiment, two slag removal openings 131 are provided, and the two slag removal openings 131 are symmetrically arranged on the horizontal axis of the top cover 13 .

[0022] Furthermore, in another embodiment, a through hole 132 is opened in the middle of the top cover, and a plurality of hole covers 133 are arranged around the top cover 13 , and the plurality of hole covers 133 are symmetrically distributed on both sides of the line connecting the two slag removal ports 131 .

[0023] The utility model is convenient for connecting with the atmospheric leg of the scraper condenser by setting the through hole 132, so as to facilitate the input of EG into the through hole 132; by setting the hole cover 133, it is convenient to draw out the double filter basket 15 in the outer chamber for cleaning, insert the double filter basket 10 back after cleaning, and then reset the hole cover 15, so as to avoid the overall disassembly of the top cover and reduce the workload during cleaning.

[0024] According to the description and drawings of the utility model, those skilled in the art can easily manufacture or use the pre-condensation liquid sealing tank slag removal device of the utility model, and can produce the positive effects recorded in the utility model.

[0025] Unless otherwise specified, in the present invention, the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in conjunction with the drawings and according to specific circumstances.

[0026] Unless otherwise specified and limited, in the present invention, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A pre-condensation liquid sealing tank slag removal device, characterized in that: The invention comprises a first pre-condensation liquid sealing tank (1), wherein the first pre-condensation liquid sealing tank (1) comprises an inner chamber (11) and an outer chamber (12), wherein the first pre-condensation liquid sealing tank (1) is provided with a top cover (13), wherein the top cover (13) is provided with a slag removal port (131), wherein a filter plate (14) is provided at the bottom of the outer chamber (12), wherein a plurality of overflow ports (141) are provided on the filter plate (14), wherein each overflow port (141) is provided with a double filter basket (15); wherein a slag removal pipe (2) is provided above the filter plate (14), wherein one end of the slag removal pipe (2) passes through the slag removal port (131) and is connected to a residue collection barrel (3), wherein a gear pump (4) is connected to the slag removal pipe (2), wherein the gear pump (4) transports low molecular weight residues in the outer chamber (12) to the residue collection barrel (3).

2. A pre-condensation liquid sealing tank slag removal device according to claim 1, characterized in that: The slag removal pipe (2) is connected to a check valve (5).

3. A pre-condensation liquid sealing tank slag removal device according to claim 1, characterized in that: An EG output pipe (6) is provided at the bottom of the first pre-condensation liquid sealing tank (1), and the EG output pipe (6) is communicated with the outer chamber (12).

4. A pre-condensation liquid sealing tank slag removal device according to claim 1, characterized in that: Two slag removal openings (131) are provided, and the two slag removal openings (131) are symmetrically arranged on the horizontal axis of the top cover (13).

5. The pre-condensation liquid sealing tank slag removal device according to claim 1, characterized in that: A through hole (132) is provided in the middle of the top cover, and a plurality of hole covers (133) are provided around the top cover (13), wherein the plurality of hole covers (133) are symmetrically distributed on both sides of a line connecting the two slag removal ports (131).

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