Anti-coking dehydrating tower for pretreatment of waste lubricating oil

Abstract

The utility model discloses an anti-coking waste lubricating oil pretreatment dehydrating tower, which comprises a tower body, a herringbone baffle plate, a support grating, a liquid outlet cylinder, a cooling ring pipe and a filter casing, the side part of the tower body is provided with a liquid inlet and a cold feed port, the bottom of the tower body is provided with a tower bottom oil liquid outlet, and the top of the tower body is provided with a gas phase outlet; the herringbone baffles are arranged at the middle lower part of the inner cavity of the tower body and are arranged in an up-and-down staggered manner; the supporting grid is arranged in the inner cavity of the tower body at the upper part of the herringbone baffle plate; the supporting grid is filled with filler; the liquid outlet cylinder is centrally and fixedly arranged in the inner cavity of the tower body below the herringbone baffle, the liquid outlet cylinder is of a cylindrical structure, a conical disc is arranged at the bottom of the liquid outlet cylinder, a plurality of liquid outlet holes are formed in the cylinder wall, and the liquid outlet cylinder is communicated with the liquid inlet; the cooling ring pipe is arranged at the upper part of the inner cavity of the tower body and is communicated with the cold feeding hole; the filter cover is fixedly arranged on the tower bottom oil outlet; the anti-coking device is simple in structure, obvious in anti-coking effect and high in practicability, and can be widely applied to the dehydration tower for pretreatment of waste lubricating oil.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical equipment, in particular to an anti-coking waste lubricating oil pretreatment dehydration tower. Background Art

[0002] Lubricating oil is a liquid or semi-solid lubricant used on various mechanical equipment to reduce friction and protect machinery and processed parts. During use, its composition, structure and performance will change due to external conditions. As a result, waste lubricating oil will contain a large number of other impurities, mainly including water and light oil. Waste lubricating oil regeneration has become the mainstream process for waste lubricating oil recycling due to the economic, environmental and product advantages of hydrogenation process. However, metals and chlorides in waste oil can cause coking and blockage of regeneration equipment and poisoning of hydrogenation catalysts, making it impossible to achieve continuous long-term operation of equipment, seriously affecting production efficiency. Therefore, metals and chlorides in waste lubricating oil are removed by pretreatment to make their content meet the requirements of hydrogenation process. Reducing or avoiding the problems of hydrogenation catalyst poisoning, equipment blockage and equipment corrosion caused by HCl during hydrogenation is the core of the industrialization of waste lubricating oil hydrogenation process.

[0003] Among them, in the pretreatment process of waste lubricating oil, the dehydration tower is the first step of the pretreatment process. The waste lubricating oil first passes through the dehydration tower to remove most of the water in the waste oil. The upper and lower sections of the dehydration tower are both provided with packing sections, and the raw oil is fed from the middle of the dehydration tower. In the continuous pretreatment process, there is a problem of coking and clogging of the packing in the upper and lower sections of the dehydration tower, which seriously affects the long-term production of the device. How to design an internal structure of the dehydration tower to extend the coking and clogging of the dehydration tower becomes a necessity. Summary of the invention

[0004] Aiming at the deficiencies of the prior art, the utility model proposes a waste lubricating oil pretreatment dehydration tower for preventing coking.

[0005] The technical scheme of the utility model is: a dehydration tower for pretreatment of waste lubricating oil to prevent coking, the dehydration tower comprises a tower body 1, a herringbone baffle 6, a support grid 9, a liquid outlet cylinder 8, a cooling ring pipe 12 and a filter cover 7, the side of the tower body 1 is provided with a liquid inlet 2 and a cold feed inlet 4, the bottom is provided with a tower bottom oil outlet 3, and the top is provided with a gas phase outlet 5; the herringbone baffle 6 is arranged in the middle and lower part of the inner cavity of the tower body 1, and is arranged in an upper and lower staggered manner; the support grid 9 is arranged on the tower body above the herringbone baffle 6 1, a filler 10 is installed on the supporting grid 9; the liquid outlet cylinder 8 is centrally fixedly arranged in the inner cavity of the tower body 1 below the herringbone baffle 6, the liquid outlet cylinder 8 is a cylindrical structure, a conical disk is arranged at the bottom, and a plurality of liquid outlet holes are arranged on the cylinder wall, and the liquid outlet cylinder 8 is connected with the liquid inlet 2; the cooling ring pipe 12 is arranged at the upper part of the inner cavity of the tower body 1, a plurality of nozzles 11 are arranged at the bottom of the cooling ring pipe, and the cooling ring pipe 12 is connected with the cold feed port 4; the filter cover 7 is fixedly installed on the oil outlet 3 at the bottom of the tower.

[0006] Furthermore, a wire mesh demister 13 is provided at the top of the inner cavity of the tower body, and the wire mesh demister 13 uses 250Y stainless steel corrugated plate filler.

[0007] Furthermore, the herringbone baffles 6 are arranged alternately up and down, and are provided with three layers in total.

[0008] Furthermore, the filler 10 installed on the top of the supporting grid 9 is Dg38 stainless steel random stacked saddle ring filler.

[0009] Furthermore, the liquid outlet holes on the wall of the liquid outlet cylinder 8 are evenly arranged, and the hole size is φ8~φ10mm.

[0010] Furthermore, the nozzles 11 are distributed in a manner of evenly opening φ10 mm circular holes at the bottom of the cooling ring tube 12 .

[0011] Furthermore, circular holes of φ10-φ12 mm are uniformly opened around the filter cover 7.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] 1. The filler in the lower section of the dehydration tower is cancelled, and the feed port is set in the lower middle part of the dehydration tower. The coke at the bottom of the dehydration tower is directly settled at the bottom of the dehydration tower, eliminating the problem of difficulty in feeding caused by blockage of the filler in the lower section of the dehydration tower.

[0014] 2. A filter cover is installed at the bottom outlet of the dehydration tower to allow the coking materials to coke at the bottom of the tower as much as possible, thus prolonging the blockage period of the outlet pipe, filter and subsequent stage pump.

[0015] 3. The herringbone baffle can intercept most of the coking materials entrained in the gas phase, prolonging the clogging period of the upper packing of the dehydration tower. The packing in the dehydration tower adopts excellent Dg38 polysaddle ring packing, which has the advantages of reducing the overall gas phase resistance and not easy to coke, thereby prolonging the coking period.

[0016] 4. The direct cooling ring tube injection method is adopted to reduce the risk of top gas phase coking. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model provides a schematic diagram of a waste lubricating oil pretreatment dehydration tower for preventing coking.

[0018] Among them: 1-tower body, 2-liquid inlet, 3-tower bottom oil outlet, 4-cold feed inlet, 5-gas phase outlet, 6-herringbone baffle, 7-filter cover, 8-liquid outlet cylinder, 9-support grid, 10-filler, 11-nozzle, 12-cooling loop pipe, 13-wire mesh demister. DETAILED DESCRIPTION

[0019] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Example 1

[0020] A dehydration tower for pretreatment of waste lubricating oil for preventing coking, the dehydration tower comprises a tower body 1, a herringbone baffle 6, a support grid 9, a liquid outlet cylinder 8, a cooling ring pipe 12 and a filter cover 7, a liquid inlet 2 and a cold feed inlet 4 are arranged on the side of the tower body 1, a tower bottom oil outlet 3 is arranged at the bottom, and a gas phase outlet 3 is arranged at the top; the herringbone baffle 6 is arranged in the middle and lower part of the inner cavity of the tower body 1, and the upper and lower staggered arrangement is adopted; the support grid 9 is arranged in the inner cavity of the tower body 1 above the herringbone baffle 6 , a filler 10 is installed on the supporting grid 9; a liquid outlet cylinder 8 is centrally fixedly arranged in the inner cavity of the tower body 1 below the herringbone baffle 6, the liquid outlet cylinder 8 is a cylindrical structure, a conical disk is arranged at the bottom, a plurality of liquid outlet holes are arranged on the cylinder wall, and the liquid outlet cylinder 8 is connected with the liquid inlet 2; a cooling ring pipe 12 is arranged at the upper part of the inner cavity of the tower body 1, a plurality of nozzles 11 are arranged at the bottom of the cooling ring pipe, and the cooling ring pipe 12 is connected with the cold feed port 4; a filter cover 7 is fixedly installed on the oil outlet 3 at the bottom of the tower.

[0021] A wire mesh demister 13 is arranged at the top of the inner cavity of the tower body 1, and the wire mesh demister 13 adopts 250Y stainless steel corrugated plate filler; the herringbone baffles 6 are arranged alternately up and down, and a total of three layers are arranged; the filler installed on the top of the supporting grid 9 is Dg38 stainless steel random pile saddle ring filler; the liquid outlet holes on the wall of the liquid outlet cylinder 8 are evenly arranged, and the opening size is φ8~φ10mm; the nozzles 11 are distributed in the form of evenly opening φ10mm circular holes at the bottom of the cooling ring pipe; and the filter cover 7 is evenly opened with φ10~φ12mm circular holes.

[0022] When in use, waste lubricating oil with a temperature of about 160℃~180℃ enters from the liquid inlet 2, and evenly enters the inner cavity of the tower body 1 through the multi-hole opening of the liquid outlet tube 8; the high-temperature oil and gas rise and intercept part of the coking material through the herringbone baffle 6, and then make gas-liquid contact with the cold oil evenly distributed through the nozzle 11 of the cooling ring pipe 12 from the cold feed port 4 in the packing 10 of the inner cavity of the tower body 1, so as to minimize the clogging of the packing. The packing adopts excellent Dg38 polysaddle ring packing. After the gas-liquid contact, the oil and gas are separated by the wire mesh demister 13 and then extracted from the gas phase outlet 5; a filter cover 7 is provided at the bottom oil outlet of the tower, which can intercept the coke blocks falling off in the dehydration tower to avoid clogging the bottom oil outlet 3 of the tower. The overall structure of this tower can effectively extend the service life of the device.

[0023] The present invention is not limited to the above-mentioned implementation schemes. Various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention, and the changed contents still belong to the protection scope of the present invention.

Claims

1. A waste lubricating oil pretreatment dehydration tower for preventing coking, characterized in that: The dehydration tower comprises a tower body (1), a herringbone baffle (6), a support grid (9), a liquid outlet cylinder (8), a cooling ring pipe (12) and a filter cover (7); The tower body (1) is provided with a liquid inlet (2) and a cold feed inlet (4) on the side, a tower bottom oil outlet (3) at the bottom, and a gas phase outlet (5) at the top; The herringbone baffles (6) are arranged in the lower middle part of the inner cavity of the tower body (1) in an up-and-down staggered arrangement; The support grid (9) is arranged in the inner cavity of the tower body (1) above the herringbone baffle (6), and a filler (10) is installed on the support grid (9); The liquid outlet cylinder (8) is centrally fixedly arranged in the inner cavity of the tower body (1) below the herringbone baffle (6); the liquid outlet cylinder (8) is a cylindrical structure, with a conical disk arranged at the bottom and a plurality of liquid outlet holes arranged on the cylinder wall; the liquid outlet cylinder (8) is in communication with the liquid inlet (2); The cooling ring pipe (12) is arranged at the upper part of the inner cavity of the tower body (1), a plurality of nozzles (11) are arranged at the bottom of the cooling ring pipe, and the cooling ring pipe (12) is connected to the cold feed port (4); The filter cover (7) is fixedly mounted on the oil outlet (3) at the bottom of the tower; A wire mesh demister (13) is arranged at the top of the inner cavity of the tower body (1), and the wire mesh demister (13) uses stainless steel corrugated metal plate filler.

2. The anti-coking waste lubricating oil pretreatment dehydration tower according to claim 1, characterized in that: The herringbone baffles (6) are arranged in an alternating manner up and down, and are provided with three layers in total.

3. The anti-coking waste lubricating oil pretreatment dehydration tower according to claim 1, characterized in that: The filler (10) installed on the top of the support grid (9) is a stainless steel random stacked saddle ring filler.

4. The anti-coking waste lubricating oil pretreatment dehydration tower according to claim 1, characterized in that: The liquid outlet holes on the wall of the liquid outlet cylinder (8) are evenly arranged, and the size of the openings is φ8 to φ10 mm.

5. The anti-coking waste lubricating oil pretreatment dehydration tower according to claim 1, characterized in that: The nozzles (11) are distributed in a manner of evenly opening φ10 mm circular holes at the bottom of the cooling ring tube (12).

6. The anti-coking waste lubricating oil pretreatment dehydration tower according to claim 1, characterized in that: The filter cover (7) is evenly provided with circular holes of φ10 to φ12 mm around it.

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