Waste catalyst deoiling tank

Abstract

The utility model discloses a waste catalyst deoiling tank, which comprises a tank body, a plurality of deoiled mixed gas outlets, a plurality of deoiled mixed gas outlets and a plurality of deoiled mixed gas outlets, and the top of the tank body is provided with a waste catalyst feeding hole; the bottom is hollowed out and is provided with a deoiled catalyst discharge hole; the scraper assembly is arranged in the tank body and can rotate relative to the tank body, the scraper assembly is composed of a plurality of scrapers which are arranged in the radial direction and extend in the axial direction, and the scraper assembly is used for driving the waste catalyst entering the tank body to move in the circumferential direction; and the nitrogen distribution unit is arranged below the hollow bottom of the tank body and is used for simultaneously introducing low-temperature nitrogen, medium-temperature nitrogen and high-temperature nitrogen into different fan-shaped areas of the tank body. Through the fixedly arranged tank body, the fixedly arranged nitrogen distribution unit providing different temperatures and the rotatable scraping plate, nitrogen with different temperatures can be introduced into different positions at the same time when the waste catalyst moves in the circumferential direction, so that the continuous deoiling operation of the catalyst is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of catalyst regeneration, in particular to a waste catalyst de-oiling tank. Background Art

[0002] For most industrial catalysts, long-term operation will lead to a decrease in catalyst activity or selectivity, that is, catalyst deactivation. At this time, the catalyst cannot meet the product quality requirements or is economically unreasonable, so it must be charred and regenerated to restore the activity of the catalyst. For example, the catalyst of the hydrogenation stabilization device in the coal liquefaction process exists in the reactor in a boiling state, and the amount of heavy oil contained in the catalyst to be unloaded by the catalyst online loading system is as high as 30%. Therefore, in order to make the catalyst unloaded from the boiling bed hydrogenation process meet the conditions for regeneration, the catalyst must first be de-oiled. Most catalyst de-oiling methods use high-temperature incineration, which not only wastes resources, but also the discharged incineration waste gas contains more harmful substances. If not handled properly, it is easy to cause serious environmental pollution.

[0003] There are other methods for deoiling waste catalysts in the prior art. For example, Chinese patent application CN102527448A discloses a catalyst deoiling device and deoiling method, which includes a deoiling 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. The deoiling tank is provided with a filter element. The oil-gas pipeline is led out from the bottom of the deoiling tank, and is connected in series with the oil-gas-nitrogen heat exchanger, the oil-gas water cooler and the gas-liquid separator in sequence; the nitrogen pipeline is led out from the top of the gas-liquid separator, and is connected in series with the circulating nitrogen compressor, the oil-gas-nitrogen heat exchanger, the circulating nitrogen heater and the deoiling tank in sequence. The nitrogen escaping from the gas-liquid separator is pressurized by the circulating nitrogen compressor, and then heat-exchanged by the oil-gas-nitrogen heat exchanger and heated by the circulating nitrogen heater, and then transported to the deoiling tank, so that the oil in the oil-containing catalyst is gasified into oil and gas. The device in this scheme can complete the deoiling of the catalyst in a short time, and the deoiling rate is as high as 98.7%.

[0004] The solution of the prior art is to pass hot nitrogen into the deoiling tank to heat the stored oil adsorbed on the catalyst surface and in the pores, and the oil and gas are continuously separated from the catalyst and taken away with the hot nitrogen. After further cooling, the nitrogen and oil are separated. Due to the use of a step-by-step heating mode, the deoiling operation time can be shortened and the deoiling efficiency can be improved. This solution uses a circulating nitrogen heater to step-by-step heat the nitrogen inlet temperature of the deoiling tank and control the constant temperature time separately, wherein the lower temperature stage (for example, 120-140°C) is used to remove moisture, and the constant temperature time is short (2-4 hours); the higher temperature stage (for example, 280-300°C) is used for the gasification of oil products, and the constant temperature time is longer (4-8 hours). However, the use of a step-by-step heating mode will cause the waste catalyst deoiling to be unable to operate continuously.

[0005] Therefore, there is an urgent need for a deoiling tank that can realize continuous deoiling operation of the waste catalyst, with better deoiling effect.

[0006] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0007] The utility model aims to provide a waste catalyst deoiling tank, which can simultaneously introduce nitrogen of different temperatures at different positions while the waste catalyst moves circumferentially through a fixed tank body, a fixed nitrogen distribution unit providing different temperatures, and a rotatable scraper, thereby realizing continuous deoiling operation of the catalyst.

[0008] To achieve the above-mentioned purpose, the utility model provides a waste catalyst deoiling tank, comprising: a tank body, a top of which is provided with a waste catalyst feed inlet and a plurality of deoiled mixed gas outlets; a bottom which is hollowed out and provided with a deoiled catalyst discharge port; a scraper assembly, which is arranged in the tank body and rotatably arranged relative to the tank body, the scraper assembly being composed of a plurality of radially arranged and axially extending scrapers, and being used to drive the waste catalyst entering the tank body to move circumferentially; a nitrogen distribution unit, which is arranged below the hollow bottom of the tank body, and is used to simultaneously introduce low-temperature nitrogen, medium-temperature nitrogen and high-temperature nitrogen into different sector-shaped areas of the tank body.

[0009] Furthermore, in the above technical solution, the scraper assembly may include a first scraper, a second scraper and a third scraper which are radially arranged and vertically extended; each scraper is gap-matched with the inner wall of the tank body and are circumferentially spaced 120° from each other.

[0010] Furthermore, in the above technical solution, the area where low-temperature nitrogen is introduced is a low-temperature nitrogen stripping area, which is used to strip water from the waste catalyst; the area where medium-temperature nitrogen is introduced is a medium-temperature nitrogen stripping area, which is used to strip light oil from the waste catalyst; and the area where high-temperature nitrogen is introduced is a high-temperature nitrogen stripping area, which is used to strip heavy oil from the waste catalyst.

[0011] Furthermore, in the above technical solution, the waste catalyst feed port is arranged at a position corresponding to the low-temperature nitrogen stripping zone; and the deoiled catalyst discharge port is arranged at a position corresponding to the high-temperature nitrogen stripping zone.

[0012] Furthermore, in the above technical solution, the tank body may be a cylindrical structure, and the scraper assembly may rotate along the axis of the tank body at a speed of 1 to 6 r / h.

[0013] Furthermore, in the above technical solution, the hollow bottom plate at the bottom of the tank body may be a metal mesh structure, and it is sufficient to ensure that the mesh size is smaller than the minimum particle size of the waste catalyst.

[0014] Furthermore, in the above technical solution, the temperature of the low-temperature nitrogen can be controlled at 130°C; the temperature of the medium-temperature nitrogen can be controlled at 180°C; the temperature of the high-temperature nitrogen can be controlled at 270°C; and the nitrogen volume flow rate is 350m 3 / h.

[0015] Furthermore, in the above technical solution, the spent catalyst at the spent catalyst feed port may be an ebullated bed hydrogenation regeneration catalyst.

[0016] Furthermore, in the above technical solution, the number of outlets for the deoiled mixed gas can be three, and the locations thereof correspond to the low-temperature nitrogen stripping zone, the medium-temperature nitrogen stripping zone and the high-temperature nitrogen stripping zone, respectively.

[0017] Furthermore, in the above technical solution, the waste catalyst feed port can be extended downward through a feed pipe, and the lower end of the feed pipe can be 50 mm away from the hollow bottom plate of the tank body.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] 1) The utility model uses a fixed tank body, a fixed nitrogen distribution unit providing different temperatures, and a rotatable scraper assembly to simultaneously introduce nitrogen of different temperatures at different positions while the waste catalyst moves circumferentially, thereby realizing continuous deoiling of the catalyst; by continuously introducing nitrogen of different temperatures in different sector-shaped areas, the waste catalyst is gradually heated up during the movement, thereby realizing nitrogen stripping in different areas, and water, light oil and heavy oil can be stripped out separately and discharged from their respective mixed gas outlets, which is convenient for subsequent separate separation of oil and gas;

[0020] 2) The utility model not only realizes the continuous operation of waste catalyst deoiling by three scrapers spaced 120° apart and covering three sector-shaped areas with nitrogen at different temperatures, but also seamlessly connects low-temperature stripping, medium-temperature stripping and high-temperature stripping, and the stripping operation time is more balanced and the stripping efficiency is higher.

[0021] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, and at the same time to make the above and other purposes, technical features and advantages of the utility model easier to understand, one or more preferred embodiments are listed below and described in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the waste catalyst deoiling tank of the utility model.

[0023] Figure 2 yes Figure 1 Schematic diagram of the structure viewed from above.

[0024] 1-tank body, 11-waste catalyst feed port, 12-water+nitrogen outlet, 13-light oil+nitrogen outlet, 14-heavy oil+nitrogen outlet, 15-deoiled catalyst outlet, 2-scraper assembly, 21-first scraper, 22-second scraper, 23-third scraper. DETAILED DESCRIPTION

[0025] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0026] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0027] In this document, for the convenience of description, spatial relative terms such as "below", "below", "down", "above", "above", "upper", etc. may be used to describe the relationship between one element or feature and another element or feature in the accompanying drawings. It should be understood that the spatial relative terms are intended to include different orientations of the object in use or operation in addition to the orientation depicted in the figure. For example, if the object in the figure is turned over, the element described as being "below" or "below" other elements or features will be oriented "above" the element or feature. Therefore, the exemplary term "below" can include both below and above. Objects may also have other orientations (rotated 90 degrees or other orientations) and the spatial relative terms used in this document should be interpreted accordingly.

[0028] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable.

[0029] The utility model provides a waste catalyst deoiling tank, which is used for deoiling used waste catalysts, and the waste catalysts include but are not limited to fluidized bed hydrogenation regeneration catalysts. The processing principle of the deoiling tank of the utility model is as follows: hot nitrogen is introduced into the tank body, so that the catalyst heats the stored oil adsorbed on the catalyst surface and in the pores during the migration process, and the oil and gas are continuously separated from the catalyst and taken out of the tank body together with the hot nitrogen. The mixed gas can be further cooled outside the tank body before the nitrogen and oil are separated. Compared with the step-by-step heating method of the prior art, the utility model adopts a method of continuously introducing nitrogen of different temperatures in different areas, so that the waste catalyst gradually heats up during the movement process, thereby realizing nitrogen stripping in different areas, stripping out water, light oil and heavy oil respectively, and realizing continuous deoiling operation.

[0030] like Figure 1 , 2 As shown, the waste catalyst deoiling tank of the utility model comprises at least a tank body 1, a scraper assembly 2 and a nitrogen distribution unit (not shown in the figure). The tank body 1 preferably adopts a cylindrical structure, and the top of the tank body 1 is provided with a waste catalyst feed port and multiple outlets for the deoiled mixed gas. Figure 1 There are three outlets for the mixed gas, namely, a water + nitrogen outlet 12, a light oil + nitrogen outlet 13, and a heavy oil + nitrogen outlet 14. Waste catalysts include but are not limited to fluidized bed hydrogenation regeneration catalysts. The bottom of the tank body 1 is hollowed out and is provided with a de-oiled catalyst outlet 15. Specifically, the hollow bottom plate at the bottom of the tank body 1 is a metal mesh structure, and it is sufficient to ensure that the mesh size is smaller than the minimum particle size of the waste catalyst. The hollow bottom plate serves as a support plate for the waste catalyst, and the nitrogen introduced upward can fully contact the catalyst particles through the metal mesh. Preferably, but not restrictively, the waste catalyst feed port 11 can extend downward through a feed pipe, and the lower end of the feed pipe can be 50 mm away from the hollow bottom plate of the tank body 1. The scraper assembly 2 is arranged in the tank body 1 and is rotatable relative to the tank body. The scraper assembly 2 is composed of a plurality of scrapers arranged radially and extending axially. Each scraper can be fixedly mounted on a rotating shaft located at the axis of the tank body (not shown in the figure). The overall size of the scraper assembly 2 is slightly smaller than the size of the tank body 1, as long as the scraper assembly 2 can rotate freely in the tank body 1. The scraper assembly 2 of the utility model is used to drive the waste catalyst that has entered the tank body 1 and scattered on the hollow bottom plate of the tank body 1 to move in the circumferential direction (that is, the scraper scrapes the catalyst particles on the hollow bottom plate to make them move along the circumferential direction). Figure 2 The nitrogen distribution unit is arranged below the hollow bottom plate of the tank body 1, and is used to simultaneously introduce low-temperature nitrogen, medium-temperature nitrogen and high-temperature nitrogen into different sector-shaped areas of the tank body 1. Figure 1 As shown, three nitrogen gases of different temperatures are introduced upward into the tank body 1 in three sector-shaped areas respectively, and the nitrogen distribution unit can adopt the structure of existing nozzles or nozzles as long as it can cover the above three sector-shaped areas respectively.

[0031] The utility model uses a fixed tank body 1, a fixed nitrogen distribution unit providing different temperatures, and a rotatable scraper assembly 2 to simultaneously introduce nitrogen at different temperatures at different positions while the waste catalyst moves circumferentially, thereby achieving continuous deoiling operation of the catalyst.

[0032] Further Figure 1 , 2 As shown, preferably but not restrictively, the scraper assembly of the utility model includes a first scraper 21, a second scraper 22 and a third scraper 23 which are radially arranged and vertically extended; each scraper is fitted with the inner wall of the tank body 1 and is 120° apart from each other along the circumferential direction. At the same time, the distribution range of nitrogen can cover the entire hollow bottom plate of the tank body 1. The low-temperature nitrogen introduction area is the low-temperature nitrogen stripping area (i.e. Figure 1 A sector-shaped area in the tank), in this area, water in the waste catalyst can be stripped out under the action of low-temperature nitrogen, and then the mixture of water + nitrogen is discharged from the water + nitrogen outlet 12 in the corresponding area on the top of the tank body 1; the area where medium-temperature nitrogen is introduced is the medium-temperature nitrogen stripping area, in this area, light oil in the waste catalyst can be stripped out under the action of medium-temperature nitrogen, and then the mixture of light oil + nitrogen is discharged from the light oil + nitrogen outlet 13 in the corresponding area on the top of the tank body 1; the area where high-temperature nitrogen is introduced is the high-temperature nitrogen stripping area, in this area, heavy oil in the waste catalyst can be stripped out under the action of high-temperature nitrogen, and then the mixture of heavy oil + nitrogen is discharged from the heavy oil + nitrogen outlet 14 in the corresponding area on the top of the tank body 1. Further, Figure 1 As shown, the waste catalyst feed port 11 is set at a position corresponding to the low-temperature nitrogen stripping zone; and the de-oiled catalyst discharge port 15 is set at a position corresponding to the high-temperature nitrogen stripping zone. Through this arrangement, the waste catalyst feed can always fall into the low-temperature nitrogen stripping zone, and the newly fallen feed can be moved along the scraper as it rotates. Figure 2 The waste catalyst is scraped counterclockwise to the medium-temperature nitrogen stripping zone and the high-temperature nitrogen stripping zone, so that the continuous feed undergoes low-temperature stripping, medium-temperature stripping and high-temperature stripping in turn. The catalyst particles that are fully deoiled after high-temperature stripping are discharged from the deoiled catalyst outlet 15, completing the continuous operation of deoiling the waste catalyst.

[0033] The utility model uses three scrapers with an interval of 120° and the coverage of three sector-shaped areas by nitrogen at different temperatures, which can not only realize the continuous operation of waste catalyst deoiling, but also the low-temperature stripping, medium-temperature stripping and high-temperature stripping can be seamlessly connected, the operation time of the stripping is more balanced, and the stripping efficiency is higher.

[0034] The following is a detailed description using a specific example:

[0035] The de-oiling tank adopts a cylindrical structure with a diameter of φ2000mm. The bottom plate of the cylinder is a hollow structure. The scraper assembly can rotate along the axis of the tank at a speed of 1 to 6 r / h. 3 / h and the waste catalyst with oil content of 22.9wt% is fed into the low-temperature nitrogen stripping zone through the feed port. The feed pipe is a φ150mm pipe. Low-temperature nitrogen, medium-temperature nitrogen and high-temperature nitrogen enter the stripping zone from the bottom of the tank through the hollow bottom plate. The temperature of the low-temperature nitrogen is 130℃; the temperature of the medium-temperature nitrogen is 180℃; the temperature of the high-temperature nitrogen is 270℃; the nitrogen pressure is 0.6mpa(a), and the nitrogen volume flow rate is 350m 3 / h. Low-temperature nitrogen, medium-temperature nitrogen and high-temperature nitrogen are used to gradually strip water, light oil and heavy oil from the waste catalyst. The deoiled catalyst is discharged from the deoiling tank through the catalyst discharge port of the high-temperature nitrogen zone, and the mixed gas of "water + nitrogen", "light oil + nitrogen" and "heavy oil + nitrogen" is discharged through the mixed gas outlet on the top of the tank body. The discharged mixed gas can be further connected to the separation and recovery system to separate nitrogen from the mixed gas of oil, gas and nitrogen and recycle it in the deoiling tank of the utility model. It has been verified by experiments that the oil content in the deoiled catalyst is ≤1.3wt%.

[0036] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of illustration and illustration. These descriptions are not intended to limit the utility model to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the utility model and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the utility model and various different options and changes. Any simple modifications, equivalent changes and modifications made to the above exemplary embodiments should fall within the scope of protection of the utility model.

Claims

1. A waste catalyst deoiling tank, characterized in that: include: The tank body has a waste catalyst feed port and multiple de-oiled mixed gas outlets at the top; The bottom is hollowed out and provided with a discharge port for the de-oiled catalyst; A scraper assembly is disposed in the tank body and is rotatable relative to the tank body, the scraper assembly is composed of a plurality of scrapers disposed radially and extending axially, and is used to drive the waste catalyst entering the tank body to move in a circumferential direction; The nitrogen distribution unit is arranged below the hollow bottom of the tank body and is used to simultaneously introduce low-temperature nitrogen, medium-temperature nitrogen and high-temperature nitrogen into different sector-shaped areas of the tank body.

2. The spent catalyst deoiling tank according to claim 1, characterized in that: The scraper assembly comprises a first scraper, a second scraper and a third scraper which are radially arranged and vertically extended; each scraper is fitted with a clearance between the inner wall of the tank body and are spaced 120 degrees from each other in the circumferential direction.

3. The spent catalyst deoiling tank according to claim 2, characterized in that: The area where the low-temperature nitrogen is introduced is a low-temperature nitrogen stripping area, which is used to strip water from the waste catalyst; the area where the medium-temperature nitrogen is introduced is a medium-temperature nitrogen stripping area, which is used to strip light oil from the waste catalyst; and the area where the high-temperature nitrogen is introduced is a high-temperature nitrogen stripping area, which is used to strip heavy oil from the waste catalyst.

4. The spent catalyst deoiling tank according to claim 3, characterized in that: The waste catalyst feed port is arranged at a position corresponding to the low-temperature nitrogen stripping zone; and the deoiled catalyst discharge port is arranged at a position corresponding to the high-temperature nitrogen stripping zone.

5. The spent catalyst deoiling tank according to claim 1, characterized in that: The tank body is a cylindrical structure, and the scraper assembly rotates along the axis of the tank body at a speed of 1 to 6 r / h.

6. The spent catalyst deoiling tank according to claim 1, characterized in that: The hollow bottom plate at the bottom of the tank body is a metal mesh structure, and the mesh size is smaller than the minimum particle size of the waste catalyst.

7. The spent catalyst deoiling tank according to claim 1, characterized in that: The temperature of the low-temperature nitrogen is 130°C; the temperature of the medium-temperature nitrogen is 180°C; the temperature of the high-temperature nitrogen is 270°C; the nitrogen volume flow rate is 350m 3 / h.

8. The spent catalyst deoiling tank according to claim 1, characterized in that: The spent catalyst at the spent catalyst feed port is an ebullating bed hydrogenation regeneration catalyst.

9. The spent catalyst deoiling tank according to claim 3, characterized in that: The number of the deoiled mixed gas outlets is three, and the locations thereof correspond to the low-temperature nitrogen stripping zone, the medium-temperature nitrogen stripping zone and the high-temperature nitrogen stripping zone, respectively.

10. The spent catalyst deoiling tank according to claim 1, characterized in that: The waste catalyst feed port extends downward through a feed pipe, and the lower end of the feed pipe is 50 mm away from the hollow bottom plate of the tank body.

Images