Fluidized bed waste catalyst regeneration and recovery system and method

Abstract

The fluidized bed waste catalyst regeneration and recovery system comprises a waste catalyst tank, the waste catalyst tank is connected with a vibrating screen device, the vibrating screen device is connected with a feeding hopper, the feeding hopper is connected with a scorching tank and a hot catalyst tank, the hot catalyst tank is connected with the scorching tank, and the scorching tank is connected with a combustion device and a cyclone. The cyclone is connected with the collecting tank which is connected with the vibrating screen device. According to the invention, the waste catalyst is screened, the screened recyclable catalyst enters the charring tank for regeneration charring, and is finally stored in the hot catalyst tank for later use, meanwhile, the heat of the charring tank is used for generating steam, fine powder carried by the charring tank along with flue gas enters the charring tank for screening, and the recyclable catalyst in the waste catalyst is recycled, so that the additional value is increased; the effect of mass production of steam by heat generated by charring of the charring tank is obvious, the whole system is low in energy consumption and environment-friendly, and the operation cost and the investment cost in the regeneration process are low.

Description

Technical Field

[0001] The invention relates to the technical field of fluidized beds in petroleum and coal chemical industries, and in particular to a system and method for regenerating and recovering waste catalysts in a fluidized bed. Background Art

[0002] A fluidized bed is usually composed of a reactor and a regenerator. The reactor is used for catalytic reaction and rapid contact between gas and solid. The regenerator is used to recover heat and regenerate the catalyst, and to keep the catalyst active so that it can continue to be used in the fluidized cycle. Fluidized bed reactors and regenerators are often used as an integrated system to improve chemical efficiency and thermodynamic cycle benefits.

[0003] The expected life of the catalyst in the reactor, that is, the time the catalyst remains active and selective under actual reaction conditions, is an important performance of the catalyst, reflecting the durability and efficiency of the catalyst in use. As time goes by, the catalyst activity decreases to the point where it cannot be used, and the spent catalyst must be regenerated or replaced with a new one.

[0004] In recent years, more and more production processes have been put into fluidized beds, such as FCC, DCC, MTO, MTP, PDH, etc. With the replacement of catalysts, the life of fluidized bed catalysts is getting longer and longer, and the hardness is constantly increasing. However, the recovery of waste fluidized bed catalysts has become a problem at this stage, and centralized and unified treatment is required. The treatment cost is high, which increases the operating costs of productive enterprises. The content of reusable catalysts in waste catalysts is high, and direct treatment of waste catalysts will generate unnecessary waste and incur treatment costs. Summary of the invention

[0005] The present invention aims to solve the problems of high cost and unnecessary waste in the treatment of waste catalyst in a fluidized bed at present, and provides a waste catalyst regeneration and recovery system for a fluidized bed.

[0006] In order to achieve the above technical objectives, the technical solution provided by the present invention is:

[0007] A fluidized bed waste catalyst regeneration and recovery system, wherein a waste catalyst tank for storing waste catalyst is connected to a vibrating screen device, a discharge port of the vibrating screen device is connected to a burnt tank and a hot catalyst tank for burnt regenerated catalyst, a discharge port of the burnt tank is connected to the hot catalyst tank, a flue gas outlet of the burnt tank is connected to a cyclone for separating flue gas and catalyst, the cyclone is connected to a catalyst collecting tank, and the catalyst collecting tank is connected to the vibrating screen device.

[0008] Specifically, a feeding hopper can be provided between the vibrating screen device and the charring tank and the hot catalyst tank; specifically, the catalyst after charring and regeneration enters the hot catalyst tank for standby; the combustion device includes but is not limited to the combustion chamber and the heating furnace of the present invention, the factory wind enters the combustion device to burn and increase the temperature of the charring tank to 450-650°C, and provides the wind required for charring, the smoke generated by the charring tank enters the top of the cyclone and is discharged into the waste heat recovery system, the catalyst fine powder is collected at the bottom of the cyclone, the catalyst fine powder enters the catalyst collection tank, and then enters the vibrating screen device.

[0009] Furthermore, the vibrating screen device includes vibrating screen one and vibrating screen two, and vibrating screen one is connected to vibrating screen two.

[0010] Furthermore, both the vibrating screen 1 and the vibrating screen 2 are provided with a sieve plate, and the sieve plate is provided with a motor and a gear, and the motor drives the gear to carry out conveying and screening. Specifically, the motor and the gear are fixed with a frame.

[0011] Furthermore, the sieve plates are tiltedly arranged inside the vibrating screen 1 and the vibrating screen 2, and the aperture of the sieve plate of the vibrating screen 1 is larger than the aperture of the sieve plate of the vibrating screen 2. Specifically, the vibrating screen 1 filters large particles of catalyst and impurities entrained in the catalyst, and carries out bagging treatment. The vibrating screen can be selected with an aperture size of 80 to 100 mesh to filter particles larger than 150 um, and the filter mesh size can be selected according to the catalyst particle size distribution required by the device; the vibrating screen 2 filters small particles of catalyst, especially fine powder, entrained in the catalyst, and carries out bagging treatment. The vibrating screen can be selected with an aperture size of 1250 mesh or above to filter particles below 10 um, and the filter mesh size can be selected according to the catalyst particle size distribution required by the device.

[0012] Furthermore, both the vibrating screen 1 and the vibrating screen 2 are provided with a feed port and a discharge port.

[0013] Furthermore, a first buffer tank is provided at the discharge port of the vibrating screen 1, and a first baffle plate and a first ton bag hook are provided at the bottom of the first buffer tank.

[0014] Furthermore, the discharge port of the second vibrating screen is provided with a first baffle.

[0015] Furthermore, both the vibrating screen 1 and the vibrating screen 2 are provided with screen slots.

[0016] Furthermore, a collecting trough, a feeding port and a second baffle are sequentially arranged at the bottom of the vibration screen.

[0017] Furthermore, a collecting trough, a feeding port, a second buffer trough, a second baffle and a second ton bag hook are sequentially arranged at the bottom of the second vibrating screen.

[0018] Furthermore, the charring tank is provided with a heat extraction pipeline, the heat extraction pipeline is connected to the steam drum, the steam drum is connected to the superheater, specifically, the heat of charring is extracted by the heat extraction pipeline and steam is produced in the steam drum, the steam drum is connected to the superheater, and finally 1.0MPa superheated steam is produced.

[0019] Another aspect of the present invention provides a method for regenerating and recovering spent catalyst in a fluidized bed, comprising the following steps:

[0020] Step 1: Screening the spent catalyst;

[0021] Step 2: The usable waste catalyst particles after screening enter the coke tank for coke regeneration, and the regenerated catalyst is stored for standby use;

[0022] Step 3: The flue gas dust generated during the coking process enters the cyclone and collects the catalyst particles;

[0023] Step 4: The collected catalyst particles are screened again, and the screened catalyst is stored for future use.

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention adopts a waste catalyst regeneration and recovery system with a reasonable layout, simple structure, small footprint and low investment cost. The system screens the waste catalyst, screens out the reusable catalyst and puts it into the charring tank for regeneration and charring, and finally stores it in the hot catalyst tank for standby use. At the same time, the heat of the charring tank is used to produce steam; the smoke generated by the charring tank enters the top of the cyclone and is discharged into the waste heat recovery system, and the catalyst fine powder is collected at the bottom of the cyclone and then enters the screening again to recover the recyclable catalyst in the waste catalyst, thereby increasing the added value. The overall system has low energy consumption and is environmentally friendly, and the regeneration process has low operating cost and low investment cost.

[0026] 2. On the one hand, the burnt catalyst of the present invention can be regenerated with obvious regeneration effect, and the waste catalyst can be recovered, and the treatment cost of the waste catalyst can be reduced, while the utilization rate of the waste catalyst can be improved, and the added value can be increased. It is safe, reliable and environmentally friendly. On the other hand, a heat extraction pipeline is provided, and the heat of the burnt catalyst is extracted by the heat extraction pipeline and steam is produced in the steam drum. The steam drum is connected to the superheater, and finally 1.0MPa of superheated steam is produced, and the operating cost of the regeneration process is low.

[0027] 3. The vibration device in the present invention can filter out large impurities and fine powder particles, with low power consumption, low energy consumption, good screening effect, and a buffer tank and a ton bag hook are set to collect waste materials of no use value and directly bag them for centralized treatment. The operation is convenient and the classification effect is obvious. The collection tank and baffle are set, which is flexible to operate and easy to control.

[0028] 4. The combustion devices in the present invention can provide the temperature and wind required for burning the tank, can be set independently, and are easy to operate and control.

[0029] 5. The flue gas in the present invention can be incorporated into the waste heat steam production system to recover waste heat and effectively reduce heat loss.

[0030] 6. The regeneration medium in the present invention adopts factory air, and no independent air supply facilities are set up, the system is stable, and the investment cost is low.

[0031] 7. When the catalyst of the present invention does not need to be charred, in order to filter some large particle impurities and fine powder, it can be directly screened by a vibrating screen device and then enter the hot catalyst tank for standby use without starting the charring tank, which is flexible and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A flowchart of Embodiment 1 provided by the present invention;

[0033] Figure 2 A flowchart of Embodiment 2 provided by the present invention;

[0034] Figure 3 A top view of a vibrating screen 1 provided by the present invention;

[0035] Figure 4 A side view of a vibrating screen provided by the present invention;

[0036] Figure 5 A top view of the vibrating screen 2 provided by the present invention;

[0037] Figure 6 This is a side view of the vibrating screen 2 provided by the present invention.

[0038] Markings and corresponding parts names in the attached drawings:

[0039] 1-waste catalyst tank; 2-hot catalyst tank; 3-vibrator 1; 4-vibrator 2; 5-feeding hopper; 6-charred tank; 7-combustion chamber; 8-cyclone; 9-catalyst collecting tank; 10-steam drum; 11-superheater; 12-heating furnace; 101-feeding port; 102-discharging port; 103-frame; 104-sieve plate; 105-motor; 106-gear, 107-first buffer tank; 108-first baffle; 109-first ton bag hook; 110-sieve tank; 111-collecting tank; 112-discharging port; 113-second baffle; 114-second buffer tank; 115-second ton bag hook DETAILED DESCRIPTION

[0040] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the directions or positional relationships indicated by "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are directions or positional relationships based on the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] Example 1

[0044] like Figure 1 As shown, a fluidized bed waste catalyst regeneration and recovery system provided in this embodiment includes a waste catalyst tank 1 and a hot catalyst tank 2. The bottom of the waste catalyst tank 1 is connected with a vibrating screen 3, the vibrating screen 3 is connected to a vibrating screen 4, the vibrating screen 4 is connected to a feeding hopper 5, the feeding hopper 5 is connected to a charring tank 6 and a hot catalyst tank 2, the charring tank 6 is connected to the hot catalyst tank 2, the bottom of the charring tank 6 is connected to a combustion chamber 7, the top of the charring tank 6 is connected to a cyclone 8, the bottom of the cyclone 8 is connected to a catalyst collecting tank 9, the bottom of the catalyst collecting tank 9 is connected to an inlet of a vibrator 4, the charring tank 6 is provided with a heat extraction pipeline, the heat extraction pipeline is connected to a steam drum 10, the steam drum 10 is connected to a deoxygenated water pipeline, the heat of the charring is extracted by the heat extraction pipeline and steam is produced in the steam drum 10, the steam drum 10 is connected to a superheater 11, and finally 1.0 MPa of superheated steam is produced.

[0045] In this embodiment, when the catalyst of the reactor is unloaded into the waste catalyst tank 1, the waste catalyst tank 1 is filtered through a vibrating screen 3 using a sieve plate 104 with a mesh size of 80 to 100 to filter out particles larger than 150 um, and the large particles are bagged for unified treatment. The recyclable catalyst enters the vibrating screen 2 4. The vibrating screen 2 4 uses a sieve plate 104 with a mesh size of 1250 or above to filter out particles smaller than 10 um, and the filtered fine powder is bagged for unified treatment. The remaining recovered catalyst enters the charring tank 6, and the factory wind enters the combustion chamber 7. The fuel gas is ignited to increase the factory wind temperature. The outlet of the combustion chamber 7 is controlled at 450 to 650°C to ensure that the temperature is sufficient for the catalyst in the charring tank 6 to be charred and regenerated. The fuel in the combustion chamber 7 is slowly closed and charred with the factory wind. When the temperature of the charring tank 6 drops slowly and steadily, it indicates that the regeneration of the waste catalyst is completed, and the factory wind is closed to transfer the regenerated catalyst to the hot catalyst tank 2 for standby use.

[0046] A feed port 101 and a discharge port 102 are provided on the vibrating screen 3. The waste catalyst enters the screen plate 104 through the feed port 101. The waste catalyst is transported and screened by a gear 106 driven by a motor 105. The motor 105 and the gear 106 are fixed by a frame 103. A first buffer tank 107 is provided on the discharge port 102. A first baffle 108 and a first ton bag hook 109 are provided at the bottom of the first buffer tank 107. A screen tank 110 is provided on the vibrating screen 3. A collecting tank 111, a discharge port 112 and a first baffle 108 are provided at the bottom of the vibrating screen 3 in sequence. The large particles screened out are directly bagged, which is easy to operate and has a good separation effect.

[0047] The vibrating screen 24 is provided with a feed port 101 and a discharge port 102, the waste catalyst passes through the feed port 101 sieve plate 104, and the waste catalyst is transported and screened by the motor 105 driving the gear 106, the motor 105 and the gear 106 are fixed by the frame 103, the discharge port 102 is provided with a baffle 108, the vibrating screen 24 is provided with a screen slot 110, the bottom of the vibrating screen 14 is provided with a collecting slot 111 and a discharge port 112, the discharge port 112 is provided with a second buffer slot 114, the bottom of the second buffer slot 114 is provided with a second baffle 113 and a second ton bag hook 115, the small particles and fine powder screened out are directly bagged, the operation is convenient, and the separation effect is good.

[0048] The vibrating screen 3 filters the large particles of catalyst and impurities in the catalyst and carries out bagging. The vibrating screen can choose 80-100 mesh filter to filter particles larger than 150um. The aperture size can be selected according to the catalyst particle size distribution required by the device. The vibrating screen 24 filters the small particles of fine powder catalyst in the catalyst and carries out bagging. The vibrating screen can choose 1250 mesh and above aperture size to filter particles below 10um. The aperture size can be selected according to the catalyst particle size distribution required by the device.

[0049] The flue gas regenerated from the charring tank 6 enters the cyclone 8, the catalyst after the cyclone enters the catalyst collecting tank 9, the collected catalyst enters the vibrating screen 2 4 for screening and recovery of useful catalyst, and the flue gas enters the waste heat recovery system for heat recovery. This system is safe, reliable, environmentally friendly and has low energy consumption.

[0050] The fluidized bed waste catalyst regeneration and recovery system provided in this embodiment uses little fuel gas, has a significant regeneration effect, increases added value, produces steam, has a low operating cost for the regeneration process, saves energy and reduces consumption, and has a low investment cost.

[0051] Example 2

[0052] like Figure 2As shown, a fluidized bed waste catalyst regeneration and recovery system provided in this embodiment includes a waste catalyst tank 1 and a hot catalyst tank 2, the bottom of the waste catalyst tank 1 is connected with a vibrating screen 3, the vibrating screen 3 is connected to a vibrating screen 4, the vibrating screen 4 is connected to a feeding hopper 5, the feeding hopper 5 is connected to a charring tank 6 and a hot catalyst tank 2, the bottom of the charring tank 6 is connected to a heating furnace 12, the top of the charring tank 6 is connected to a cyclone 8, the bottom of the cyclone 8 is connected to a catalyst collecting tank 9, the bottom of the catalyst collecting tank 9 is connected to the inlet of the vibrator 4, the charring tank 6 is provided with a heat extraction pipeline, the heat extraction pipeline is connected to a steam drum 10, the steam drum 10 is connected to a deoxygenated water pipeline, the heat of charring is used to produce steam by the heat extraction steam drum 10, the steam drum 10 is connected to a superheater 11, and finally 1.0 MPa of superheated steam is produced, the heating furnace 12 increases the temperature of the charring tank 6 to 450-650°C, and the wind used for charring and the deoxygenated water pipeline are connected to the heating furnace 12 to increase the temperature before entering the steam drum 10.

[0053] The fluidized bed waste catalyst regeneration and recovery system provided in this embodiment has a simple structure, a small footprint, low investment cost, safety and reliability, and is environmentally friendly. The system produces steam, and the operating cost of the regeneration process is low.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0055] The above specific implementation methods are detailed descriptions of the present invention. It cannot be determined that the specific implementation methods of the present invention are limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions and substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A fluidized bed waste catalyst regeneration and recovery system, characterized in that: A waste catalyst tank (1) for storing waste catalyst is connected to a vibrating screen device, a discharge port of the vibrating screen device is connected to a burnt tank (6) for burnt regenerated catalyst and a hot catalyst tank (2), a discharge port of the burnt tank (6) is connected to the hot catalyst tank (2), a smoke outlet of the burnt tank (6) is connected to a cyclone (8) for separating smoke and catalyst, the cyclone (8) is connected to a catalyst collection tank (9), and the catalyst collection tank (9) is connected to the vibrating screen device.

2. A fluidized bed waste catalyst regeneration and recovery system according to claim 1, characterized in that: The vibrating screen device comprises a vibrating screen one (3) and a vibrating screen two (4), wherein the vibrating screen one (3) is connected to the vibrating screen two (4).

3. A fluidized bed waste catalyst regeneration and recovery system according to claim 2, characterized in that: The vibrating screen 1 (3) and the vibrating screen 2 (4) are both provided with a sieve plate (104), and the sieve plate (104) is provided with a motor (105) and a gear (106), and the motor (105) drives the gear (106) to carry out conveying and screening.

4. A fluidized bed waste catalyst regeneration and recovery system according to claim 3, characterized in that: The sieve plates (104) are both obliquely arranged inside the first vibrating screen (3) and the second vibrating screen (4), and the aperture of the sieve plate (104) of the first vibrating screen (3) is larger than the aperture of the sieve plate (104) of the second vibrating screen (4).

5. The fluidized bed waste catalyst regeneration and recovery system according to claim 2, characterized in that: The vibrating screen 1 (3) and the vibrating screen 2 (4) are both provided with a feed port (101) and a discharge port (102).

6. A fluidized bed waste catalyst regeneration and recovery system according to claim 5, characterized in that: The discharge port (102) of the vibrating screen 1 (3) is provided with a first buffer groove (107), and a first baffle (108) and a first ton bag hook (109) are provided at the bottom of the first buffer groove (107).

7. A fluidized bed waste catalyst regeneration and recovery system according to claim 5, characterized in that: The discharge port (102) of the second vibrating screen (4) is provided with a first baffle (108).

8. The fluidized bed waste catalyst regeneration and recovery system according to claim 2, characterized in that: The vibrating screen 1 (3) and the vibrating screen 2 (4) are both provided with a screen slot (110).

9. The fluidized bed waste catalyst regeneration and recovery system according to claim 2, characterized in that: The bottom of the vibrating screen (3) is provided with a collecting trough (111), a material discharge port (112) and a second baffle (113) in sequence.

10. A fluidized bed waste catalyst regeneration and recovery system according to claim 2, characterized in that: The bottom of the second vibrating screen (4) is provided with a collecting tank (111), a material discharge port (112), a second buffer tank (114), a second baffle (113) and a second ton bag hook (115) in sequence.

11. The fluidized bed waste catalyst regeneration and recovery system according to claim 1, characterized in that: The coking tank (6) is provided with a heat extraction pipeline, the heat extraction pipeline is connected to a steam drum (10), and the steam drum (10) is connected to a superheater (11).

12. A method for regenerating and recovering spent catalyst in a fluidized bed, characterized in that: Using a device as described in any one of claims 1 to 11, comprising the following steps: Step 1: Screening the spent catalyst; Step 2: The usable waste catalyst particles after screening enter the coke burning tank for coke regeneration, and the regenerated catalyst is stored for standby use; Step 3: The flue gas dust generated during the coking process enters the cyclone and collects the catalyst particles; Step 4: The collected catalyst particles are screened again, and the screened catalyst is stored for future use.

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