Waste catalyst deoiling device

Abstract

The invention discloses a waste catalyst deoiling device, which carries out deoiling treatment through hot nitrogen, and comprises an outer cylinder, two ends of which are provided with a hollow rotating shaft in a penetrating manner; one side wall surface of the outer cylinder is provided with an open-type different-temperature nitrogen introduction area, and the other side wall surface of the outer cylinder is provided with a mixed gas outlet of deoiled oil gas and nitrogen; the deoiling inner cylinder is communicated and fixed with the hollow rotating shaft, so that the deoiling inner cylinder can rotate relative to the outer cylinder; the side wall of the deoiling inner cylinder is of a filter screen structure, and the mesh size is smaller than the minimum particle size of the waste catalyst; and the deoiling inner cylinder is obliquely arranged and is sequentially provided with nitrogen feed ports corresponding to the nitrogen introduction areas with different temperatures along the moving direction of the waste catalyst particles. According to the invention, the continuous operation of deoiling the waste catalyst can be realized by virtue of the inclined rotatable barrel and the partitioned introduction of nitrogen at different temperatures.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial catalyst regeneration, and particularly relates to an oil removal device for waste catalysts. Background Art

[0002] For most industrial catalysts, the long-term operation process will lead to a decrease in catalyst activity or selectivity, that is, catalyst deactivation. At this time, if the catalyst cannot meet the product quality requirements or is economically unreasonable, it must be subjected to coke burning regeneration to restore the catalyst activity. For example, the catalyst in the hydrogenation stabilization unit of the coal liquefaction process exists in a boiling state in the reactor, and the heavy oil content in the spent catalyst unloaded through the catalyst on-line loading system is as high as 30%. Therefore, in order to enable the catalyst unloaded from the ebullated bed hydrogenation process to meet the regeneration conditions, it is necessary to first perform an oil removal operation on this catalyst. Most of the catalyst oil removal methods use high-temperature incineration, which not only wastes resources, but also the discharged incineration waste gas contains more harmful substances. If not properly treated, it is easy to cause serious environmental pollution.

[0003] In the prior art, there are also other ways to remove oil from waste catalysts. For example, Chinese Patent Application CN102527448A discloses a catalyst oil removal device and an oil removal method. The device includes an oil removal tank, a gas-liquid separator, an oil-gas pipeline, a circulating nitrogen compressor, a nitrogen pipeline, an oil-gas water cooler, a circulating nitrogen heater, and an oil-gas-nitrogen heat exchanger. Among them, a filter element is provided in the oil removal tank. The oil-gas pipeline is led out from the bottom of the oil removal tank and is successively connected in series with the oil-gas-nitrogen heat exchanger, the oil-gas water cooler, and the gas-liquid separator; the nitrogen pipeline is led out from the top of the gas-liquid separator and is successively connected in series with the circulating nitrogen compressor, the oil-gas-nitrogen heat exchanger, the circulating nitrogen heater, and the oil removal tank. The nitrogen gas escaping from the gas-liquid separator is boosted by the circulating nitrogen compressor and then heat-exchanged through the oil-gas-nitrogen heat exchanger and heated by the circulating nitrogen heater and then transported to the oil removal tank to vaporize the oil in the oil-containing catalyst into oil gas. The device in this solution can complete the oil removal of the catalyst in a short time, and the oil removal rate is as high as 98.7%.

[0004] The solution of this prior art is to introduce hot nitrogen into the oil removal tank to heat the oil stored on the surface and in the pores of the catalyst. The oil gas is continuously separated from the catalyst and taken away together with the hot nitrogen. After further cooling, the nitrogen and oil are separated. Since a stepped heating mode is adopted, the oil removal operation time can be shortened and the oil removal efficiency can be improved. This solution performs stepped heating on the nitrogen inlet temperature of the oil removal tank through a circulating nitrogen heater and separately controls the constant temperature time. Among them, the stage with a lower temperature (for example, 120-140 °C) is used to remove moisture, and the constant temperature time is shorter (2-4 hours); in the stage with a higher temperature (for example, 280-300 °C) is used for the vaporization of the oil product, and the constant temperature time is longer (4-8 hours). However, the adoption of the stepped heating mode will cause the oil removal of the waste catalyst to be unable to be continuously operated.

[0005] Therefore, there is an urgent need for a device that can achieve continuous deoiling operation of waste catalysts, which not only has better deoiling effect but also can effectively save energy consumption.

[0006] The information disclosed in this background art section is only intended to enhance the understanding of the overall background of the present invention and should not be regarded as an admission or any form of implication that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Invention

[0007] The object of the present invention is to provide a waste catalyst deoiling device, through a rotatable cylinder arranged obliquely and nitrogen gas at different temperatures introduced into different zones, continuous operation of waste catalyst deoiling can be achieved.

[0008] Another object of the present invention is to provide a waste catalyst deoiling device, through a plurality of rotatable cylinders arranged obliquely and connected in series, nitrogen gas at different temperatures can be introduced into different cylinders, not only can continuous operation of waste catalyst deoiling be achieved, but also the mixed gas of oil gas and nitrogen gas at different temperatures in different cylinders can be separately treated and recycled.

[0009] To achieve the above object, according to the first aspect of the present invention, the present invention provides a waste catalyst deoiling device for deoiling treatment with hot nitrogen gas, including: an outer cylinder, with hollow rotating shafts passing through both ends thereof; an open-type nitrogen gas introduction zone at different temperatures is provided on one side wall surface of the outer cylinder, and an outlet for the mixed gas of oil gas and nitrogen gas after deoiling is provided on the other side wall surface; a deoiling inner cylinder, which is communicated with and fixed to the hollow rotating shaft, so that the deoiling inner cylinder can rotate relative to the outer cylinder; the side wall of the deoiling inner cylinder is a filter structure, and the pore size of the mesh is smaller than the minimum particle size of the waste catalyst; the deoiling inner cylinder is arranged obliquely and successively provided with nitrogen gas inlet ports corresponding to the nitrogen gas introduction zones at different temperatures along the moving direction of the waste catalyst particles.

[0010] Further, in the above technical solution, the nitrogen gas introduction zone at different temperatures of the outer cylinder includes a low-temperature nitrogen gas introduction zone, a medium-temperature nitrogen gas introduction zone, and a high-temperature nitrogen gas introduction zone, and the nitrogen gas inlet ports of the deoiling inner cylinder include a low-temperature nitrogen gas inlet port, a medium-temperature nitrogen gas inlet port, and a high-temperature nitrogen gas inlet port corresponding to the positions of the nitrogen gas introduction zones at different temperatures.

[0011] Further, in the above technical solution, the port at the higher end of the hollow rotating shaft is the waste catalyst inlet port, and the port at the lower end is the outlet port for the catalyst after deoiling.

[0012] Further, in the above technical solution, the inclination angle of the deoiling inner cylinder can be 5 - 15 °C.

[0013] Further, in the above technical solution, the temperature of the low-temperature nitrogen can be controlled at 120°C, the temperature of the medium-temperature nitrogen can be controlled at 180°C, and the temperature of the high-temperature nitrogen can be controlled at 270°C; the spent catalyst slowly and sequentially inclines downward through the low-temperature nitrogen stripping zone, the medium-temperature nitrogen stripping zone, and the high-temperature nitrogen stripping zone in the oil removal inner cylinder, and water, light oil, and heavy oil in the spent catalyst can be stripped out respectively.

[0014] Further, in the above technical solution, while the spent catalyst slowly inclines downward, it can be in a continuous tumbling state under the rotation of the inner cylinder, thereby completing the continuous oil removal operation of the spent catalyst.

[0015] Further, in the above technical solution, the outer cylinder diameter can be φ500mm and the length can be 3300mm; the inner cylinder diameter can be φ400mm, the length can be 3000mm, and the rotation speed is 2r / min; the volume flow rate at the spent catalyst feed port can be 3m 3 / h.

[0016] Further, in the above technical solution, the introduction direction of nitrogen at different temperatures can be from bottom to top or from top to bottom. Correspondingly, the discharge direction of the mixed gas is the same as the introduction direction of nitrogen.

[0017] According to the second aspect of the present invention, the present invention provides a spent catalyst oil removal device for performing oil removal treatment with hot nitrogen, including a plurality of cylindrical structures connected in series through a hollow rotating shaft. Each cylindrical structure further includes: an outer cylinder, with both ends passing through the hollow rotating shaft; an open nitrogen introduction area is provided on one side wall surface of the outer cylinder, and an outlet for the mixed gas of the oil and gas and nitrogen after oil removal is provided on the other side wall surface; an oil removal inner cylinder, which is communicated with and fixed to the hollow rotating shaft, so that the oil removal inner cylinder can rotate relative to the outer cylinder; the side wall of the oil removal inner cylinder is a filter structure, and the mesh size is smaller than the minimum particle size of the spent catalyst; the oil removal inner cylinder is inclined and different inner cylinders are sequentially introduced with nitrogen at different temperatures along the moving direction of the spent catalyst particles.

[0018] Further, in the above technical solution, the cylindrical structures connected in series can sequentially include a first cylinder, a second cylinder, and a third cylinder along the moving direction of the spent catalyst particles; the first cylinder is introduced with low-temperature nitrogen, the second cylinder is introduced with medium-temperature nitrogen, and the third cylinder is introduced with high-temperature nitrogen.

[0019] Further, in the above technical solution, the port at the higher end of the hollow rotating shaft at the first cylinder is the spent catalyst feed port, and the port at the lower end of the hollow rotating shaft at the third cylinder is the outlet for the catalyst after oil removal.

[0020] Further, in the above technical solution, the inclination angle of the oil removal inner cylinder of each cylindrical structure is 5-15°C.

[0021] Further, in the above technical solution, the temperature of the low-temperature nitrogen is 120°C, the temperature of the medium-temperature nitrogen is 180°C, and the temperature of the high-temperature nitrogen is 270°C; the spent catalyst slowly and sequentially inclines downward through the oil-removing inner cylinder of each cylinder structure, and water, light oil, and heavy oil in the spent catalyst are respectively stripped in the oil-removing inner cylinders of the first cylinder, the second cylinder, and the third cylinder.

[0022] Further, in the above technical solution, while the spent catalyst is slowly moving downward at an inclination, it can be in a continuous tumbling state under the rotation of the oil-removing inner cylinder of each cylinder structure. The spent catalyst completes the continuous oil removal operation of the spent catalyst after passing through the first cylinder, the second cylinder, and the third cylinder in sequence.

[0023] Further, in the above technical solution, the outer cylinder diameter of each cylinder structure can be φ500mm, and the length can be 1100mm; the oil-removing inner cylinder diameter of each cylinder structure can be φ400mm, the length can be 1000mm, and the rotation speed is 2r / min; the volume flow rate at the spent catalyst feed inlet can be 3m 3 / h.

[0024] Further, in the above technical solution, the oil removal device can recycle nitrogen in the following way: the fresh high-temperature nitrogen heated to 270°C is introduced into the third cylinder to strip the heavy oil in the spent catalyst; the medium-temperature nitrogen condensed and cooled to 180°C and separated is introduced into the second cylinder to strip the light oil in the spent catalyst; the low-temperature nitrogen condensed and cooled to 120°C and separated is introduced into the first cylinder to strip the water in the spent catalyst; the nitrogen after further cooling and the supplemented fresh nitrogen are heated to 270°C together and then recycled.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1) Through the inclined inner and outer cylinder structures and the hollow rotating shaft (i.e., the first embodiment) of the present invention, for the spent catalyst particles that are simultaneously moving axially and tumbling circumferentially, nitrogen at different temperatures can be used to strip the spent catalyst in different regions, thereby effectively realizing the continuous operation of spent catalyst oil removal; the spent catalyst slowly and sequentially inclines downward through the low-temperature nitrogen stripping zone, the medium-temperature nitrogen stripping zone, and the high-temperature nitrogen stripping zone in the oil-removing inner cylinder, and water, light oil, and heavy oil in the spent catalyst can be respectively stripped; since the spent catalyst is in a continuous tumbling state in the inner cylinder, the stripping efficiency is improved, the amount of stripping nitrogen is reduced, and the oil removal operation time can be effectively shortened;

[0027] 2) Through the structure of multiple inner and outer cylinders arranged obliquely and connected in series and the shared hollow rotating shaft in the present invention (i.e., the second embodiment), for the waste catalyst particles that move axially and tumble circumferentially simultaneously, nitrogen at different temperatures can be used to strip the waste catalyst in each deoiling inner cylinder respectively, so as to effectively realize the continuous operation of waste catalyst deoiling. Not only can water, light oil, and heavy oil in the waste catalyst be stripped respectively, but also the nitrogen + water, nitrogen + light oil, and nitrogen + heavy oil stripped can be condensed and cooled respectively, separating water, light waste oil, and heavy waste oil and conducting separate treatment; through the oblique arrangement of the three cylinders, the waste catalyst slowly moves from the waste catalyst feed port to the deoiled catalyst outlet under the action of gravity. By setting different cylinders for temperature zoning, and under the rotation of the deoiling inner cylinder of each cylinder structure, the waste catalyst is always in a continuous tumbling state. After the waste catalyst passes through the first cylinder, the second cylinder, and the third cylinder in sequence, the continuous waste catalyst deoiling operation can be completed.

[0028] 3) By using the deoiling device of the second embodiment in combination with the nitrogen + oil and gas separation system in the present invention, nitrogen can be recycled more effectively, saving nitrogen consumption and reducing energy consumption at the same time.

[0029] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly and be able to implement it according to the content of the specification, and in order to make the above and other purposes, technical features, and advantages of the present invention more understandable, one or more preferred embodiments are listed below and described in detail with reference to the accompanying drawings as follows. Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of Embodiment 1 of the waste catalyst deoiling device of the present invention (using the inner and outer cylinder structure, and nitrogen is ventilated from bottom to top in zones).

[0031] Figure 2 It is another schematic structural diagram of Embodiment 1 of the waste catalyst deoiling device of the present invention (using the inner and outer cylinder structure, and nitrogen is ventilated from top to bottom in zones).

[0032] Figure 3 It is a schematic structural diagram of Embodiment 2 of the waste catalyst deoiling device of the present invention (using three series-connected inner and outer cylinder structures, and nitrogen is ventilated from bottom to top in each cylinder).

[0033] Figure 4 It is a connection schematic diagram of Embodiment 3 of the waste catalyst deoiling device of the present invention (using the deoiling device of Embodiment 2 in combination with the separation system after deoiling).

[0034] Main reference numeral description:

[0035] 1 - Outer cylinder, 11 - Partition plate, 12 - Mixed gas outlet, 2 - Inner deoiling cylinder, 21 - Low - temperature nitrogen stripping zone, 22 - Medium - temperature nitrogen stripping zone, 23 - High - temperature nitrogen stripping zone, 3 - Rotating shaft;

[0036] 100 - First cylinder, 101 - First cooler, 102 - First separator, 200 - Second cylinder, 201 - Second cooler, 202 - Second separator, 300 - Third cylinder, 301 - Third cooler, 302 - Third separator, 401 - Heater. Detailed implementation manners

[0037] The following combines the drawings to describe the detailed implementation manners of the present invention in detail. However, it should be understood that the protection scope of the present invention is not limited by the detailed implementation manners.

[0038] Unless otherwise clearly stated, in the whole specification and claims, the term "comprising" or its variations such as "including" or "having" etc. will be understood to include the stated elements or components, without excluding other elements or other components.

[0039] In this article, for the convenience of description, spatial relative terms such as "below", "beneath", "under", "above", "over", "on" etc. can be used to describe the relationship between one element or feature and another element or feature in the drawings. It should be understood that the spatial relative terms are intended to cover different directions of the object in use or operation in addition to the directions depicted in the figures. For example, if the object in the figure is flipped, the element described as "below" or "under" other elements or features will be oriented "above" the element or feature. Therefore, the exemplary term "below" can cover both the lower and upper directions. The object can also have other orientations (rotated 90 degrees or other orientations) and the spatial relative terms used herein should be interpreted accordingly.

[0040] In this article, the terms "first", "second" etc. are used to distinguish two different elements or parts, and are not used to define a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second" etc. can also be interchanged with each other.

[0041] The waste catalyst deoiling device of the present invention deoils in the following manner, that is, hot nitrogen is introduced into the device to heat the oil stored on the surface and in the pores of the catalyst, and the oil and gas are continuously separated from the catalyst and carried away together with the hot nitrogen. After further cooling, the nitrogen and oil are separated. Compared with the stepwise heating method of the prior art, the present invention adopts the method of continuously introducing nitrogen at different temperatures in different regions, so that the waste catalyst gradually heats up during the moving process, thereby realizing the stripping of nitrogen in different regions, stripping out water, light oil and heavy oil respectively, and realizing the continuous operation of deoiling; after the nitrogen at different temperatures is stripped and separated from the oil and gas, it can also be recycled respectively, achieving the effect of energy saving. The following will be described in detail with several specific embodiments.

[0042] Example 1

[0043] As Figure 1 shown, this embodiment provides a waste catalyst deoiling device that performs deoiling treatment through hot nitrogen, and at least includes an outer cylinder 1 and a deoiling inner cylinder 2. Among them, a hollow rotating shaft 3 penetrates through both ends of the outer cylinder 1, which can be used as the rotating shaft of the inner cylinder 2 and can also be used as the inlet and outlet channels for the catalyst respectively. An open different-temperature nitrogen inlet area is provided on one side wall surface of the outer cylinder 1 (that is, Figure 1 the lower wall surface in Figure 1 ), and an outlet 12 for the mixture of the oil and gas and nitrogen after deoiling is provided on the other side wall surface (that is,

[0044] the upper wall surface in Figure 1As shown, preferably but not restrictively, the different temperature nitrogen gas inlet zones of the outer cylinder 1 may include a low-temperature nitrogen gas inlet zone, a medium-temperature nitrogen gas inlet zone, and a high-temperature nitrogen gas inlet zone. The three inlet zones are separated by a partition plate 11. The nitrogen gas inlets of the oil-removing inner cylinder 2 include a low-temperature nitrogen gas inlet, a medium-temperature nitrogen gas inlet, and a high-temperature nitrogen gas inlet corresponding to the positions of the different temperature nitrogen gas inlet zones. The temperature of the low-temperature nitrogen gas can be controlled at 120°C, the temperature of the medium-temperature nitrogen gas can be controlled at 180°C, and the temperature of the high-temperature nitrogen gas can be controlled at 270°C; the spent catalyst slowly and sequentially inclines downward through the low-temperature nitrogen gas stripping zone, the medium-temperature nitrogen gas stripping zone, and the high-temperature nitrogen gas stripping zone in the oil-removing inner cylinder, respectively stripping out water, light oil, and heavy oil from the spent catalyst.

[0045] Specifically, in this embodiment, spent catalyst with a volume flow rate of 3 m 3 / h and an oil content of 25.8% wt is fed into the inner cylinder 2 from the spent catalyst inlet. The diameter of the inner cylinder 2 is φ400 mm and the length is 3000 mm; the diameter of the outer cylinder 1 is φ500 mm and the length is 3300 mm, and the rotational speed of the inner cylinder 2 is 2 r / min. Nitrogen gas at low temperature of 120°C, medium temperature of 180°C, and high temperature of 270°C at 0.8 MPa is respectively fed into the inner cylinder 2 in the corresponding inlet zones, and the feeding amounts are respectively 500 m 3 / h. The spent catalyst slowly and sequentially passes downward through the low-temperature nitrogen gas stripping zone 21, the medium-temperature nitrogen gas stripping zone 22, and the high-temperature nitrogen gas stripping zone 23, and is in a tumbling state under the action of the rotating inner cylinder while passing through, and water, light oil, and heavy oil can be respectively stripped out from the spent catalyst in different zones. Sampling and analysis are carried out on the oil-removed catalyst, and the oil content is 0.5 wt%. The nitrogen gas + oil and gas stripped out are condensed and cooled, and the waste oil is separated and enters the waste oil recovery device (not shown in the figure). Through the inclined setting of the inner cylinder, the spent catalyst slowly moves from the spent catalyst inlet to the oil-removed catalyst outlet under the action of gravity. By setting the structure of stripping with different temperature zones, continuous oil removal operation of the spent catalyst can be realized; at the same time, due to the rotatable structure of the inner cylinder, the spent catalyst is in a continuous tumbling state in the inner cylinder, thereby improving the stripping efficiency, reducing the consumption of stripping nitrogen gas, and effectively shortening the oil removal operation time.

[0046] Further as Figure 2 shown, different from the structure in Figure 1 , the feeding directions of the low-temperature nitrogen gas, the medium-temperature nitrogen gas, and the high-temperature nitrogen gas can also adopt the top-down manner. Correspondingly, the discharging direction of the mixed gas is the same as the feeding direction of the nitrogen gas, which is also top-down. Figure 2 The implementation manner in Figure 1 can achieve the same technical effects as the implementation manner in

[0047] Example 2

[0048] AsFigure 3 As shown in the figure, this embodiment provides a waste catalyst deoiling device, which performs deoiling treatment with hot nitrogen. It includes a plurality of cylinder structures (i.e., inner and outer cylinders) connected in series through a hollow rotating shaft 3. Each cylinder structure further includes an outer cylinder 1 and a deoiling inner cylinder 2. Among them, both ends of the outer cylinder penetrate through the hollow rotating shaft 3; an open nitrogen inlet area is provided on one side wall surface of the outer cylinder, and an outlet for the mixture of deoiled oil gas and nitrogen is provided on the other side wall surface. The deoiling inner cylinder 2 is communicated with and fixed to the hollow rotating shaft, so that the deoiling inner cylinder 2 can rotate relative to the outer cylinder; the side wall of the deoiling inner cylinder 2 is a filter structure, and the mesh size is smaller than the minimum particle size of the waste catalyst; the deoiling inner cylinder 2 is inclined (the inclination angle of each deoiling inner cylinder is preferably 5 - 15 °C; the port at the higher end of the hollow rotating shaft 3 at the first cylinder 100 serves as the waste catalyst feed port, and the port at the lower end of the hollow rotating shaft 3 at the third cylinder 300 is the deoiled catalyst discharge port). Different deoiling inner cylinders 2 are successively passed through nitrogen at different temperatures along the moving direction of the waste catalyst particles.

[0049] In this embodiment, through a plurality of series-connected inner and outer cylinder structures that are inclined and a shared hollow rotating shaft, for waste catalyst particles that are simultaneously moving axially and tumbling circumferentially, nitrogen at different temperatures can be used to strip the waste catalyst in each deoiling inner cylinder respectively, thereby effectively realizing the continuous operation of waste catalyst deoiling.

[0050] Further as Figure 3 shown, preferably but not restrictively, the series-connected inner and outer cylinder structures successively include a first cylinder 100, a second cylinder 200, and a third cylinder 300 along the moving direction of the waste catalyst particles; low-temperature nitrogen is passed into the first cylinder 100, medium-temperature nitrogen is passed into the second cylinder 200, and high-temperature nitrogen is passed into the third cylinder 300. The temperature of the low-temperature nitrogen can be controlled at 120 °C, the temperature of the medium-temperature nitrogen can be controlled at 180 °C, and the temperature of the high-temperature nitrogen can be controlled at 270 °C; the waste catalyst slowly and successively passes through the deoiling inner cylinder 2 of each cylinder structure in a downward inclined manner, and water, light oil, and heavy oil in the waste catalyst can be respectively stripped out in the deoiling inner cylinders 2 of the first cylinder 100, the second cylinder 200, and the third cylinder 300.

[0051] Specifically, in this embodiment, waste catalyst with a volume flow rate of 3 m 3 / h and an oil content of 25.8% wt is fed from the waste catalyst feed port into the inner cylinder 2 of the first cylinder 100. The diameters of the three inner cylinders are φ400 mm and the lengths are 1000 mm; the diameters of the three outer cylinders are φ500 mm and the lengths are 1100 mm, and the rotation speed of the inner cylinder is 2 r / min. Low-temperature nitrogen at 120 °C, medium-temperature nitrogen at 180 °C, and high-temperature nitrogen at 270 °C with a pressure of 0.8 MPa are respectively passed into the first inner cylinder 100, the second inner cylinder 200, and the third inner cylinder 300, and the passing amounts are 500 m 3 / h, the spent catalyst slowly passes downward through the low-temperature nitrogen stripping zone (i.e., the first inner cylinder), the medium-temperature nitrogen stripping zone (i.e., the second inner cylinder), and the high-temperature nitrogen stripping zone (i.e., the third inner cylinder) in sequence, stripping out water, light oil, and heavy oil from the spent catalyst respectively. The deoiled catalyst is sampled and analyzed, and the oil content is 0.5 wt%. The nitrogen + water, nitrogen + light oil, and nitrogen + heavy oil stripped out can be condensed and cooled respectively, and water, light waste oil, and heavy waste oil are separated and treated separately.

[0052] Through the inclined setting of the three cylinders, the spent catalyst slowly moves from the spent catalyst feed port to the deoiled catalyst outlet under the action of gravity. By setting different cylinders for temperature zoning, and at the same time, under the rotation of the deoiled inner cylinder of each cylinder structure, the spent catalyst is always in a continuously tumbling state. After the spent catalyst passes through the first cylinder, the second cylinder, and the third cylinder in sequence, the continuous deoiling operation of the spent catalyst can be completed; due to the use of independent inner and outer cylinder structures in different temperature zones, the water, light waste oil, and heavy waste oil in the deoiling products can be treated separately.

[0053] Example 3

[0054] As Figure 4 shown, this embodiment is a further application of Embodiment 2. By using the deoiling device of Embodiment 2 in combination with the nitrogen + oil-gas separation system, nitrogen can be recycled more effectively, saving nitrogen consumption and reducing energy consumption at the same time.

[0055] Furthermore, as Figure 4 shown, connect the "water + nitrogen" outlet of the first cylinder 100 to the first cooler 101, the first separator 102, and the heater 401 in sequence, for providing high-temperature nitrogen to the third cylinder 300; connect the "light oil + nitrogen" outlet of the second cylinder 200 to the second cooler 201 and the second separator 202 in sequence, for providing low-temperature nitrogen to the first cylinder 100; connect the "heavy oil + nitrogen" outlet of the third cylinder 200 to the third cooler 301 and the third separator 302 in sequence, for providing medium-temperature nitrogen to the second cylinder 200.

[0056] Specifically, after the fresh nitrogen is heated by the heater 401 to 270 °C, it is sent to the high-temperature nitrogen stripping zone (i.e., the third cylinder 300) to strip the heavy oil from the spent catalyst. The nitrogen + heavy oil is condensed and cooled to 180 °C by the third cooler 301 and then the heavy oil is separated by the third separator 302; the medium-temperature nitrogen after cooling is sent to the medium-temperature nitrogen stripping zone (i.e., the second cylinder 200) to strip the light oil from the spent catalyst. The nitrogen + light oil is condensed and cooled to 120 °C by the second cooler 201 and then the light oil is separated by the second separator 202; the low-temperature nitrogen after cooling is sent to the low-temperature nitrogen stripping zone (i.e., the first cylinder 100) to strip the water from the spent catalyst. The nitrogen + water is condensed and cooled by the first cooler 101 and the water is separated by the first separator 102; the nitrogen after cooling is heated together with the supplemented fresh nitrogen to 270 °C and then recycled. Compared with Embodiment 2, most of the nitrogen in this embodiment can be recycled, and a small part is dissolved in water and waste oil. The amount of the supplemented nitrogen can be controlled to be 5m 3 / h.

[0057] The foregoing description of specific exemplary embodiments of the present invention is for purposes of illustration and exemplification. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many changes and variations are possible in light of the above teaching. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the invention and its practical applications, so that those skilled in the art can implement and utilize the various different exemplary embodiments of the invention as well as various different selections and changes. Any simple modifications, equivalent changes, and modifications made to the above exemplary embodiments shall fall within the protection scope of the present invention.

Claims

1. An oil removal device for waste catalysts, characterized in that, oil removal treatment is carried out by hot nitrogen, including: An outer cylinder, with a hollow rotating shaft passing through both ends thereof; an open-type nitrogen gas inlet area at different temperatures is provided on one side wall surface of the outer cylinder, and an outlet for the mixture of oil gas and nitrogen after oil removal is provided on the other side wall surface; An inner oil removal cylinder, which is communicated with and fixed to the hollow rotating shaft, so that the inner oil removal cylinder can rotate relative to the outer cylinder; the side wall of the inner oil removal cylinder is a filter structure, and the mesh size is smaller than the minimum particle size of the waste catalyst; the inner oil removal cylinder is inclined and is sequentially provided with nitrogen gas inlets corresponding to the different temperature nitrogen gas inlet areas along the moving direction of the waste catalyst particles.

2. The oil removal device for waste catalysts according to claim 1, characterized in that, The different temperature nitrogen gas inlet area of the outer cylinder includes a low-temperature nitrogen gas inlet area, a medium-temperature nitrogen gas inlet area and a high-temperature nitrogen gas inlet area, and the nitrogen gas inlets of the inner oil removal cylinder include a low-temperature nitrogen gas inlet, a medium-temperature nitrogen gas inlet and a high-temperature nitrogen gas inlet corresponding to the positions of the different temperature nitrogen gas inlet areas.

3. The oil removal device for waste catalysts according to claim 1, characterized in that, The port at the higher end of the hollow rotating shaft is the waste catalyst inlet, and the port at the lower end is the outlet for the catalyst after oil removal.

4. The oil removal device for waste catalysts according to claim 1, characterized in that, The inclination angle of the inner oil removal cylinder is 5 - 15 °C.

5. The oil removal device for waste catalysts according to claim 2, characterized in that, The temperature of the low-temperature nitrogen gas is 120 °C, the temperature of the medium-temperature nitrogen gas is 180 °C, and the temperature of the high-temperature nitrogen gas is 270 °C; the waste catalyst slowly passes through the low-temperature nitrogen gas stripping area, the medium-temperature nitrogen gas stripping area and the high-temperature nitrogen gas stripping area in the inner oil removal cylinder in sequence while inclining downward, and water, light oil and heavy oil in the waste catalyst are respectively stripped out.

6. The oil removal device for waste catalysts according to claim 5, characterized in that, The waste catalyst is in a continuous tumbling state under the rotation of the inner cylinder while slowly moving downward obliquely, so as to complete the continuous oil removal operation of the waste catalyst.

7. The oil removal device for waste catalysts according to claim 1, characterized in that, The outer cylinder has a diameter of φ500mm and a length of 3300mm; the inner cylinder has a diameter of φ400mm, a length of 3000mm, and a rotational speed of 2r / min; the volumetric flow rate at the waste catalyst feed inlet is 3m 3 / h.

8. The oil removal device for waste catalysts according to claim 1, characterized in that, The feeding direction of the nitrogen gas at different temperatures is from bottom to top or from top to bottom. Correspondingly, the discharging direction of the mixture gas is the same as the feeding direction of the nitrogen gas.

9. An oil removal device for waste catalysts, characterized in that, oil removal treatment is carried out by hot nitrogen, including a plurality of cylinder structures connected in series through a hollow rotating shaft, and each cylinder structure further includes: An outer cylinder, with the hollow rotating shaft passing through both ends thereof; an open-type nitrogen gas inlet area is provided on one side wall surface of the outer cylinder, and an outlet for the mixture of oil gas and nitrogen after oil removal is provided on the other side wall surface; An inner oil removal cylinder, which is communicated with and fixed to the hollow rotating shaft, so that the inner oil removal cylinder can rotate relative to the outer cylinder; the side wall of the inner oil removal cylinder is a filter structure, and the mesh size is smaller than the minimum particle size of the waste catalyst; the inner oil removal cylinder is inclined and different inner cylinders are sequentially fed with nitrogen gas at different temperatures along the moving direction of the waste catalyst particles.

10. The oil removal device for waste catalysts according to claim 9, characterized in that, The series-connected cylinder structure sequentially includes a first cylinder, a second cylinder, and a third cylinder along the moving direction of the waste catalyst particles; low-temperature nitrogen is introduced into the first cylinder, medium-temperature nitrogen is introduced into the second cylinder, and high-temperature nitrogen is introduced into the third cylinder.

11. The waste catalyst deoiling device according to claim 10, characterized in that the port at the higher end of the hollow rotating shaft located at the first cylinder is the waste catalyst feed port, and the port at the lower end of the hollow rotating shaft located at the third cylinder is the deoiled catalyst discharge port.

12. The waste catalyst deoiling device according to claim 9, characterized in that the inclination angle of the deoiling inner cylinder of each cylinder structure is 5-15°C.

13. The waste catalyst deoiling device according to claim 10, characterized in that the temperature of the low-temperature nitrogen is 120°C, the temperature of the medium-temperature nitrogen is 180°C, and the temperature of the high-temperature nitrogen is 270°C; the waste catalyst slowly and obliquely passes downward through the deoiling inner cylinder of each cylinder structure in turn, and water, light oil, and heavy oil in the waste catalyst are respectively stripped out in the deoiling inner cylinders of the first cylinder, the second cylinder, and the third cylinder.

14. The waste catalyst deoiling device according to claim 13, characterized in that the waste catalyst is in a continuously tumbling state under the rotation of the deoiling inner cylinder of each cylinder structure while slowly moving obliquely downward, and the waste catalyst completes continuous waste catalyst deoiling operation after passing through the first cylinder, the second cylinder, and the third cylinder in turn.

15. The waste catalyst deoiling device according to claim 9, characterized in that The outer cylinder diameter of each cylinder structure is φ500mm and the length is 1100mm; the deoiling inner cylinder diameter of each cylinder structure is φ400mm, the length is 1000mm, and the rotation speed is 2r / min; the volume flow rate at the waste catalyst feed inlet is 3m 3 / h.

16. The waste catalyst deoiling device according to claim 13, characterized in that the deoiling device recycles nitrogen in the following manner: Fresh high-temperature nitrogen heated to 270°C is introduced into the third cylinder to strip out heavy oil in the waste catalyst; the medium-temperature nitrogen condensed and cooled to 180°C and separated is introduced into the second cylinder to strip out light oil in the waste catalyst; the low-temperature nitrogen condensed and cooled to 120°C and separated is introduced into the first cylinder to strip out water in the waste catalyst; the nitrogen further cooled is heated to 270°C together with the supplemented fresh nitrogen and recycled.

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