Waste mineral oil treatment tower

Abstract

The utility model relates to a treatment tower, belongs to the technical field of waste oil recovery, and particularly discloses a waste mineral oil treatment tower which comprises a tower body, a feed port formed in the upper part of the side wall of the tower body, a gas inlet formed in the lower part of the side wall of the tower body, a gas outlet formed in the top wall of the tower body, and a discharge port formed in the bottom wall of the tower body, a feeding pipe is fixedly arranged at the feeding hole, and the direction of the central axis of the feeding pipe is tangent to the side wall of the tower body; a drainage device is fixedly arranged close to the upper part in the inner cavity of the tower body, and raw materials in the feeding pipe directly enter the drainage device and are subjected to primary flash evaporation in the drainage device; a tower plate is fixedly mounted close to the lower part of the inner cavity of the tower body, and secondary flash evaporation occurs at the tower plate. The gas-liquid separation tower is simple in structure, different gas-liquid separation areas are formed in the upper area and the lower area in the tower respectively, the gas-liquid separation effect is improved, and the gas-liquid separation tower is suitable for recycling waste mineral oil.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of processing towers, belong to waste oil recovery technical field, specifically a kind of waste mineral oil processing tower. BACKGROUND

[0002] Waste mineral oil is mineral oil that cannot be used continuously, generally is changed original physicochemical property and cannot continue to use due to impurity pollution, oxidation or thermal action etc., mainly from oil sludge and oil foot in oil exploitation and refining, precipitate generated in mineral oil class storage process and the replacement oil of mechanical equipment etc.

[0003] At present, waste mineral oil disposal method has gradually been replaced by recycling mode from direct discharge mode, which can avoid pollution and resource waste caused by waste oil to environment to some extent. In the existing waste oil recovery and treatment, there are various processes and equipment, among which the widely used method is to use the distillation principle of atmospheric and vacuum tower for treatment. This method is based on the principle of mass transfer and heat transfer. By heating waste oil into vapor phase, oil gas continuously mass transfer and heat transfer with liquid during ascending in tower, different fractions are separated. The main equipment for providing gas-liquid contact site, realizing mass transfer and heat transfer and finally separating gas and liquid in the treatment tower is tray. In order to improve the gas-liquid separation effect, the number of trays is increased or full tray type treatment tower is used to increase the flash evaporation process. However, this method will cause high pressure drop. To solve the problem of high pressure drop, the temperature in the tower is often increased. The increase of temperature in the tower will easily cause coking and decomposition. Therefore, the existing equipment mainly has the problems of complex structure and poor gas-liquid separation effect. UTILITY MODEL CONTENT

[0004] In order to solve the above problems in the prior art, the utility model aims to provide a waste mineral oil processing tower to improve the gas-liquid separation effect.

[0005] To achieve the above purpose, the utility model employs the following technical scheme: a waste mineral oil processing tower, comprising a tower body, a feed inlet is formed in the upper part of the side wall of the tower body, a gas inlet is formed in the lower part of the side wall of the tower body, a gas outlet is formed in the top wall of the tower body, and a discharge outlet is formed in the bottom wall of the tower body; a feed pipe is fixedly arranged at the feed inlet, and the center axis of the feed pipe is arranged tangentially to the side wall of the tower body; a flow inducer is fixedly arranged in the upper part of the inner cavity of the tower body, the flow inducer comprises a circular ring body coaxial with the tower body and an upper and lower communication flow ring surface connecting the upper end surface of the circular ring body and the side wall of the tower body, the feed inlet is located on the side wall between the flow ring surface and the lower end surface of the circular ring body, and the circular ring body and the side wall of the tower body form an annular flow passage; a tray is fixedly installed in the lower part of the inner cavity of the tower body, and a gas supply pipe is fixedly arranged below the tray and communicated with the gas inlet.

[0006] As a limitation of the utility model: the insulating and heat preserving layer is fixed on the outer wall of the tower body, and the electric heating coil is arranged around the insulating and heat preserving layer and the outer wall of the tower body.

[0007] As a limitation of the utility model: the electric heating coil is arranged around the outer wall of the tower body corresponding to the position of the annular flow-through area.

[0008] As a limitation of the utility model: the vortex stopping device is fixed between the flow inducer and the tower plate, and the vortex stopping device comprises a plurality of vortex stopping baffles fixed on the inner wall of the tower body.

[0009] As a limitation of the utility model: the vortex stopping baffle is a vertically arranged rectangular thin plate, the horizontal edge of the vortex stopping baffle is arranged radially along the tower body, and the length of the horizontal edge is 1 / 8-1 / 10 of the inner diameter of the tower body.

[0010] As a limitation of the utility model: the gas supply pipe is in a circular ring shape, and a plurality of gas supply openings are formed in the gas supply pipe.

[0011] As a limitation of the utility model: the gas supply opening is arranged in a downward inclined direction by 45 degrees on the gas supply pipe.

[0012] As a limitation of the utility model: the type of the tower plate is any one of a tongue type tower plate, a float valve tower plate and a sieve plate.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] (1) The gas-liquid separation area formed in the utility model comprises a first gas-liquid separation area formed by the position of the flow inducer and a second gas-liquid separation area formed by the tower plate. When the liquid to be treated enters the tower through the tangential feed pipe after being heated by the heating device outside the tower, the first flash evaporation occurs in the rotating flow process formed by the annular flow-through area. The gas separated by the first flash evaporation moves upward through the central through hole of the circular ring body and is discharged from the gas outlet. The separation process of the second gas-liquid separation area is formed by the tower plate and the gas supplied by the gas supply pipe. Since the first flash evaporation has been performed, the requirements for the structure, number and temperature of the tower plate are reduced, which is beneficial to simplify the device structure and avoid high-temperature coking. That is, the gas-liquid separation effect is improved by two flash evaporations, and the utility model is especially suitable for processes requiring separation of high-boiling-point fractions.

[0015] (2) The insulating and heat preserving layer is fixed on the outer wall of the tower body, and the electric heating coil is arranged around the insulating and heat preserving layer and the outer wall of the tower body corresponding to the position of the annular flow-through area. The utility model can provide the necessary temperature for the first gas-liquid separation and can be insulated. Different temperatures can be set according to different fractions of the liquid to be treated to ensure the gas-liquid separation effect of the first flash evaporation. The insulating and heat preserving layer can avoid the diffusion of the temperature of the tower body and reduce the heat loss, thereby achieving the energy-saving effect.

[0016] (3) The utility model discloses a vortex stopping device is equipped on the upper portion of the area where the tower plate is located, can make the vortex that the liquid that passes through the flow inducer is along the annular flow of the inner wall of the tower disappears, and the liquid can be distributed evenly and falls into the tower plate, to better realize the mass transfer and heat transfer process on the tower plate, and the vortex stopping device is simple in structure, and convenient for later maintenance and cleaning.

[0017] In conclusion, the utility model has simple structure, forms different gas-liquid separation zones in the upper portion and lower portion area of the tower respectively, can reduce the number of tower plate use, hardly has pressure drop, avoids high temperature coking simultaneously, improves gas-liquid separation effect, is favorable for the long-term stable operation of equipment, is applicable to the recovery treatment of waste mineral oil. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model will be described further in detail in combination with the drawings and specific embodiments.

[0019] Figure 1 It is internal structure schematic diagram of the embodiment of the utility model;

[0020] Figure 2 It is A-A sectional view in Figure 1 .

[0021] In the drawing: 1-tower body, 2- feed pipe, 3- gas supply pipe, 4- gas outlet, 5- discharge port, 6- circular ring body, 7- flow ring surface, 8- annular flow-through area, 9- tower plate, 10- vortex stopping baffle, 11- insulation heat preservation layer. DETAILED DESCRIPTION

[0022] The preferred embodiment of the utility model will be described below in combination with the drawings. It should be understood that the waste mineral oil treatment tower described here is a preferred embodiment, which is only used to illustrate and explain the utility model, and does not constitute a limitation on the utility model.

[0023] The "up", "down" and other orientation words or position relationships in the utility model are based on the orientation relationship of the drawings of the utility model specification, and are only used to facilitate the description of the utility model and simplify the description, and do not indicate or imply that the device or element must have a specific orientation, a specific orientation structure and operation, so it cannot be understood as a limitation on the content protected by the utility model. EMBODIMENT

[0024] The embodiment is as shown in Figure 1 , Figure 2As shown, it is a waste mineral oil processing tower, including tower body 1, in the upper part of the side wall of tower body 1 open feed inlet, feed inlet is fixedly provided with feed pipe 2, feed pipe 2 is communicated with external heating device (not shown in the figure), in the lower part of the side wall of tower body 1 open gas inlet, gas inlet is fixedly provided with gas supply pipe 3, the top wall of tower body 1 open gas outlet 4, gas outlet 4 is communicated with the condensing device (not shown in the figure) provided outside, in the bottom wall of tower body 1 open discharge port 5.

[0025] The center axis of feed pipe 2 is tangentially arranged with the side wall of tower body 1, so that the raw materials in feed pipe 2 enter the tower along the circular arc direction of the side wall of tower body 1. A flow inducer is fixedly arranged in the inner cavity of tower body 1 at the upper part, the flow inducer comprises a circular ring body 6 which is coaxial with tower body 1 and communicated with the upper and lower parts, and a flow ring surface 7 which connects the upper end surface of circular ring body 6 and the side wall of tower body 1, the circular ring body 6 and the side wall of tower body 1 form an annular flow passage 8, the upper end of annular flow passage 8 is sealed by flow ring surface 7, and the position of feed inlet is arranged on the side wall between flow ring surface 7 and the lower end surface of circular ring body 6, at this time, the position of flow inducer forms a first gas-liquid separation zone. The tangential feed pipe 2 cooperates with the flow inducer to ensure that the raw materials form a swirling flow trajectory after entering the tower, so that the raw materials have a longer flash evaporation time in the annular flow passage 8, so as to realize the first gas-liquid separation, and the first flash evaporation gas-liquid separated gas moves upward through the central through hole of circular ring body 6 and is discharged from the gas outlet 4.

[0026] A tower plate 9 is fixedly arranged in the lower part of the inner cavity of tower body 1, the tower plate 9 can be any one of the tongue type tower plate, float valve tower plate and sieve plate in the prior art, and the tower plate in the embodiment is a tongue type tower plate. A second gas-liquid separation zone is formed at the tower plate 9, the tower plate 9 provides a gas-liquid contact site for the raw materials flowing downward from the upper part, so as to realize mass transfer, heat transfer and finally gas-liquid separation. Since the first flash evaporation has been carried out at the flow inducer, the requirements for the structure, number of tower plates 9 and the temperature at the tower plate 9 are reduced, which is beneficial to simplify the overall structure of the device, and avoids the problem of high temperature coking caused by increasing the temperature in the tower due to the large number of tower plates 9, and improves the gas-liquid separation effect after two flash evaporations.

[0027] A gas supply pipe 3 is fixedly arranged below the tower plate 9 and communicated with the gas inlet, the gas supply pipe 3 is communicated with the device (not shown in the figure) for providing external supply of hot steam to provide hot steam in the tower. The treated raw materials are in full contact with the high-temperature steam on the tower plate 9, so that the components with low boiling point in the treated raw materials become gas and move upward to be discharged from the gas outlet, so as to realize the fractionation effect. Specifically, the gas supply pipe 3 is in the shape of a circular ring, a plurality of gas supply openings are arranged on the gas supply pipe 3, so that the supplied steam is uniformly distributed in the tower, and the gas-liquid separation effect at the tower plate 9 is enhanced. In order to prevent the gas supply opening from being blocked, preferably, the gas supply opening is arranged on the gas supply pipe 3 and is inclined downward by 45°.

[0028] The liquid flowing into the tower through the flow guide and flowing along the inner wall of the tower in a ring shape is in a vortex. In order to make the vortex disappear and to make the liquid evenly fall on the tower plate 9, a vortex stopping device is fixed between the flow guide and the tower plate 9. The vortex stopping device includes a plurality of vortex stopping baffles 10 fixed on the inner wall of the tower body 1. The flowing liquid can be blocked by the vortex stopping baffles 10, so that the flow direction and the speed distribution are changed. Specifically, the vortex stopping baffles 10 are vertically arranged rectangular thin plates. The horizontal edges of the vortex stopping baffles 10 are arranged radially along the tower body 1. The height of the vortex stopping baffles 10 in the vertical direction is not required. The length of the horizontal edges of the vortex stopping baffles 10 is 1 / 8 to 1 / 10 of the diameter of the tower, as shown in FIG. 6. In the embodiment, four vortex stopping baffles 10 are uniformly arranged along the inner diameter of the tower body 1. The vortex stopping device has a simple structure and is convenient for maintenance, cleaning and replacement in the later period. Figure 2

[0029] In order to avoid heat loss caused by the diffusion of the temperature in the tower to the outside, an insulating layer 11 is fixed on the outer wall of the tower body 1. The insulating layer 11 can be arranged on the entire outer wall of the tower body 1 or can be arranged only in the upper region to insulate the first gas-liquid separation zone. In the embodiment, the insulating layer 11 is arranged on the entire outer wall of the tower body 1. In addition, the first gas-liquid separation zone in the upper region of the tower body 1 not only needs to maintain the temperature of the liquid to be treated entering the tower, but also needs to provide necessary temperature conditions for the first flash evaporation. Therefore, an electric heating coil (not shown in the figure) is arranged around the outer wall of the tower body 1 corresponding to the position of the annular flow passage 8. The electric heating coil can provide necessary temperature for the first gas-liquid separation and can be insulated. Different temperatures can be set according to different fractions of the liquid to be treated, so as to ensure the gas-liquid separation effect of the first flash evaporation.

[0030] When the embodiment is used, the waste mineral oil to be treated is heated to a required temperature by the heating device after part of the water and solid impurities are removed through a certain pretreatment. Then the waste mineral oil to be treated enters the treatment tower through the tangential feed pipe 2. The liquid to be treated rotates and flows in the annular flow passage 8, so that the first flash evaporation occurs. The insulating layer 11 and the electric heating coil fixed on the outer wall of the tower body 1 can provide necessary temperature for the first flash evaporation. The liquid after the first flash evaporation falls evenly on the tower plate 9 below through the vortex stopping device. Under the joint action of the tower plate 9 and the hot steam provided by the gas supply pipe 3, the liquid to be treated is subjected to the second flash evaporation. The number of the tower plates 9 can control the degree of the second flash evaporation. The structure and the number of the tower plates 9 can be selected according to specific conditions. All the gases after the fractionation are discharged through the gas outlet 4, condensed in the condensing device, and the residual liquid after the fractionation is discharged through the discharge port 5.​

Claims

1. A waste mineral oil treatment tower, comprising a tower body, characterized in that: A feed inlet is located on the upper part of the side wall of the tower body, a gas inlet is located on the lower part of the side wall of the tower body, a gas outlet is located on the top wall of the tower body, and a discharge outlet is located on the bottom wall of the tower body. A feed pipe is fixed at the feed inlet, and the central axis of the feed pipe is tangent to the side wall of the tower body. A flow guide is fixed in the upper part of the inner cavity of the tower body. The flow guide includes an annular body that is coaxial with the tower body and has vertical connection, and a flow guide annular surface connecting the upper end face of the annular body and the side wall of the tower body. The feed inlet is located on the side wall between the flow guide annular surface and the lower end face of the annular body. There is an annular flow zone between the annular body and the side wall of the tower body. A tower plate is fixedly installed in the lower part of the inner cavity of the tower body, and a gas supply pipe connected to the gas inlet is fixed below the tower plate.

2. The waste mineral oil treatment tower according to claim 1, characterized in that: An insulating layer is fixed to the outer wall of the tower, and an electric heating coil is arranged between the insulating layer and the outer wall of the tower.

3. The waste mineral oil treatment tower according to claim 2, characterized in that: The electric heating coil is arranged around the outer wall of the tower body corresponding to the location of the annular flow zone.

4. A waste mineral oil treatment tower according to any one of claims 1 to 3, characterized in that: An anti-vortex device is fixed between the flow guide and the tower plate. The anti-vortex device includes several anti-vortex baffles fixed on the inner wall of the tower body.

5. The waste mineral oil treatment tower according to claim 4, characterized in that: The anti-vortex baffle is a vertically arranged rectangular thin plate. The horizontal edge of the anti-vortex baffle is arranged radially along the tower body, and the length of the horizontal edge is 1 / 8 to 1 / 10 of the inner diameter of the tower body.

6. The waste mineral oil treatment tower according to claim 5, characterized in that: The air supply pipe is circular in shape, with several air supply openings on it.

7. A waste mineral oil treatment tower according to claim 6, characterized in that: The gas supply opening is located on the gas supply pipe with its opening angled downwards at 45°.

8. A waste mineral oil treatment tower according to any one of claims 1 to 3, 5 to 7, characterized in that: The tray type is any one of tongue-shaped tray, valve tray, or sieve tray.

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