Fischer-Tropsch catalyst reduction reactor
By adopting a stable control system and filter sleeve in the Fischer Tropsch catalyst reduction reactor, the problems of unstable temperature increase rate and low efficiency of steam and catalyst mixing reaction are solved, and efficient reduction and quality improvement of the catalyst are achieved.
Patent Information
- Application Number
- CN202422190282.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-09-06
AI Technical Summary
During the reduction process of the existing Fischer-Tropsch catalyst, the heating rate is unstable, resulting in a great impact on the equipment, and the efficiency of mixing and reaction between steam and catalyst is low, resulting in a decrease in the quality of the catalyst.
A Fischer-Tropsch catalyst reduction reactor is designed, and the first intake mechanism, the second intake mechanism is used to cooperate with the main controller and the temperature controller to achieve stable control of the catalyst temperature increase rate. At the same time, by setting up a filter sleeve and a rotating mechanism, the mixing uniformity and filtration efficiency of steam and catalyst are improved.
The catalyst heating rate is stabilized, the thermal stress affects the equipment, the equipment life is extended, the catalyst activity and quality is improved, the operator labor intensity is reduced, and the device automation level is improved.
Smart Images
Figure CN222998753U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of catalysts, in particular to a Fischer-Tropsch catalyst reduction reactor. Background Art
[0002] Fischer-Tropsch synthesis is one of the most widely used technologies in the indirect coal-to-oil process, and catalyst reduction is the most critical step in the Fischer-Tropsch synthesis production process. As is well known, Fischer-Tropsch catalysts are in the form of an oxidized state when leaving the factory and do not have reaction activity. They must be treated before use, that is, catalyst reduction. Catalyst reduction is a process of converting an oxidized iron-based catalyst into a reduced iron-based catalyst with reaction activity under the action of hydrogen. This process is the preliminary step of the Fischer-Tropsch synthesis reaction, and the quality of the reduction effect directly affects the Fischer-Tropsch synthesis reaction. Catalyst reduction is mainly divided into three processes: heating up, constant temperature, and cooling down.
[0003] The process of heating up the catalyst is the catalyst activation process. Heating up the catalyst strictly according to the heating curve is conducive to the excitation of catalyst activity. In the initial feeding stage, the heating requirement is not high, and the temperature can be raised relatively quickly before 120°C, generally 15 - 20°C / h. When the temperature is between 120°C and 250°C, the heating rate needs to be controlled at 10°C / h to reduce the influence of thermal stress on the equipment. When the temperature is between 250°C and 260°C, the temperature is controlled at 8°C / h, and when the temperature is between 260°C and 265°C, the temperature is controlled at 5°C / h to prevent temperature runaway; the temperature in the constant temperature stage is controlled at 265°C; the temperature in the cooling stage is controlled at -15°C / h. The entire heating process lasts for about 13 hours. In this process, two on-site teams need to cooperate closely to maintain a constant heating rate. Fluctuations in the heating steam pressure, fluctuations in the inlet hydrogen temperature, and the activation time of the catalyst may all change the heating rate, making it difficult to control the heating.
[0004] In the prior art, traditional methods mostly adopt manual control. The 5.0 Mpa steam valve at the inlet of the reduction reactor is adjusted to stabilize the heating rate of hydrogen at the reactor inlet. At the same time, the 6.0 Mpa steam valve of the reduction steam drum is adjusted in cooperation to maintain the stability of the heating rate of the reduction reactor. During the adjustment, the heating rate is unstable, overly relying on the experience of the operator. And during the use process, the mixing and reaction efficiency of steam and catalyst is low, ensuring the filtering function, resulting in the inability to remove impurities in the gas, reducing the quality of the catalyst. Summary of the Utility Model
[0005] The utility model provides a Fischer-Tropsch catalyst reduction reactor to solve the problems in the background art.
[0006] To achieve the above object, the present utility model provides the following technical solutions: A Fischer-Tropsch catalyst reduction reactor, comprising a tank body, a grid cylinder is fixedly installed on the lower side wall of the tank body, a sealing cover is threadedly installed on the lower surface of the grid cylinder, a filter mesh sleeve is installed between the upper surface of the sealing cover and the inner wall on the upper side of the grid cylinder, a rotating mechanism is installed on the inner wall on the upper side of the grid cylinder, a cleaning mechanism is installed on the rotating mechanism, a first air inlet mechanism and a second air inlet mechanism are sequentially installed on the left side wall of the tank body from top to bottom, both the first air inlet mechanism and the second air inlet mechanism are fixedly connected to the left side wall of the grid cylinder, an air inlet conduit is fixedly installed at a position near the lower side of the right side wall of the tank body, and the left end of the air inlet conduit is fixedly connected to the right side wall of the grid cylinder, an air outlet conduit is installed at a position near the upper side of the right side wall of the tank body, and a main controller and a first temperature controller are arranged on the front side surface of the tank body.
[0007] Further, the lower surface of the grid cylinder is an open structure, and the upper surface of the grid cylinder is a sealed structure.
[0008] Further, the rotating mechanism includes a transmission rod, a bearing assembly and turbine blades, the upper end of the transmission rod is installed on the inner wall on the upper side of the grid cylinder through the bearing assembly, and turbine blades are fixedly installed on the transmission rod at positions corresponding to the first air inlet mechanism and the second air inlet mechanism.
[0009] Further, the cleaning mechanism includes a fixed rod and a scraper, the fixed rods are respectively fixedly installed on the left and right side surfaces of the transmission rod, the fixed rods are fixedly installed with scrapers, and the scrapers are movably attached to the inner wall of the filter mesh sleeve.
[0010] Further, the first air inlet mechanism includes a steam pipe, a control valve and a second temperature controller, the steam pipe is installed on the left side wall of the tank body, and the right end of the steam pipe is embedded in the left side wall of the grid cylinder, a control valve and a second temperature controller are installed on the steam pipe, and the second air inlet mechanism has the same structure as the first air inlet mechanism.
[0011] Further, through holes are respectively opened on the side wall of the filter mesh sleeve at positions corresponding to the first air inlet mechanism, the second air inlet mechanism and the air inlet conduit.
[0012] Further, a slag discharge valve is fixedly installed on the lower surface of the sealing cover.
[0013] Compared with the prior art, the present utility model provides a Fischer-Tropsch catalyst reduction reactor, which has the following beneficial effects:
[0014] 1. The Fischer-Tropsch catalyst reduction reactor realizes stable heating rate of the catalyst in the tank by coordinating the first air inlet mechanism, the second air inlet mechanism with the main controller and the first temperature controller, reduces the influence of thermal stress generated by temperature rise change on the key equipment of the reactor, prolongs the equipment life, is beneficial to improving the catalyst activity, realizes the automatic control of the catalyst reduction process, is beneficial to reducing the labor intensity of operators, and improves the automation level of the device.
[0015] 2. The Fischer-Tropsch catalyst reduction reactor can filter impurities in steam and the catalyst by setting a filter mesh sleeve, and increases the cleaning function of the filter mesh sleeve, prolongs the service life cycle, enables the catalyst to be mixed with the injected steam evenly and quickly, heats up more comprehensively and at a higher speed, and improves the catalyst quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a structural schematic diagram of the present utility model;
[0017] Figure 2 is a sectional view of the present utility model;
[0018] Figure 3 is a structural schematic diagram of the rotating mechanism of the present utility model.
[0019] In the figure: 1. Tank body; 2. Grid cylinder; 3. Sealing cover; 4. Filter mesh sleeve; 5. Rotating mechanism; 501. Transmission rod; 502. Bearing assembly; 503. Turbine blade; 6. Cleaning mechanism; 601. Fixed rod; 602. Scraper; 7. First air inlet mechanism; 701. Steam pipe; 702. Control valve; 703. Second temperature controller; 8. Second air inlet mechanism; 9. Air inlet duct; 10. Air outlet duct; 11. Main controller; 12. First temperature controller; 13. Through hole; 14. Discharge valve. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0021] Please refer to Figures 1-3, the utility model discloses a Fischer-Tropsch catalyst reduction reactor, which comprises a tank body 1. A grid cylinder 2 is fixedly installed on the lower side wall of the tank body 1. A sealing cover 3 is installed on the lower surface of the grid cylinder 2 by means of screw threads. A filter net sleeve 4 is installed between the upper surface of the sealing cover 3 and the inner wall on the upper side of the grid cylinder 2. A rotating mechanism 5 is installed on the inner wall on the upper side of the grid cylinder 2. A cleaning mechanism 6 is installed on the rotating mechanism 5. A first air inlet mechanism 7 and a second air inlet mechanism 8 are successively installed on the left side wall of the tank body 1 from top to bottom. Both the first air inlet mechanism 7 and the second air inlet mechanism 8 are fixedly connected with the left side wall of the grid cylinder 2. An air inlet conduit 9 is fixedly installed at a position near the lower side of the right side wall of the tank body 1, and the left end of the air inlet conduit 9 is fixedly connected with the right side wall of the grid cylinder 2. An air outlet conduit 10 is installed at a position near the upper side of the right side wall of the tank body 1. A main controller 11 and a first temperature controller 12 are arranged on the front side surface of the tank body 1.
[0022] Specifically, the lower surface of the grid cylinder 2 is an open structure, and the upper surface of the grid cylinder 2 is a sealed structure.
[0023] In this embodiment, the lower surface of the grid cylinder 2 facilitates the threaded installation and connection of the sealing cover 3, and the sealed upper surface enables the gas to only be discharged through the filter net sleeve 4.
[0024] Specifically, the rotating mechanism 5 includes a transmission rod 501, a bearing assembly 502 and turbine blades 503. The upper end of the transmission rod 501 is installed on the inner wall on the upper side of the grid cylinder 2 through the bearing assembly 502. Turbine blades 503 are fixedly installed on the transmission rod 501 at positions corresponding to the first air inlet mechanism 7 and the second air inlet mechanism 8.
[0025] In this embodiment, the turbine blades 503 rotate with the steam blown in by the first air inlet mechanism 7 and the second air inlet mechanism 8, so that the turbine blades 503 drive the transmission rod 501 to rotate in the bearing assembly 502, achieving the effect of stirring the gas and simultaneously driving the cleaning mechanism 6 to rotate.
[0026] Specifically, the cleaning mechanism 6 includes a fixed rod 601 and a scraper 602. The fixed rods 601 are respectively fixedly installed on the left and right side surfaces of the transmission rod 501. Scrapers 602 are fixedly installed on the fixed rods 601. The scrapers 602 are movably attached to the inner wall of the filter net sleeve 4.
[0027] In this embodiment, the fixed rod 601 rotates with the transmission rod 501, so that the fixed rod 601 drives the scraper 602 to rotate, and the scraper 602 can scrape off the impurities on the inner wall of the filter net sleeve 4.
[0028] Specifically, the first air intake mechanism 7 includes a steam pipe 701, a control valve 702, and a second temperature controller 703. The steam pipe 701 is installed on the left side wall of the tank body 1, and the right end of the steam pipe 701 is embedded in the left side wall of the grid cylinder 2. The control valve 702 and the second temperature controller 703 are installed on the steam pipe 701. The second air intake mechanism 8 has the same structure as the first air intake mechanism 7.
[0029] In this embodiment, on the steam pipe 701, the control valve 702 with 5.0 Mpa is used as the MV (manipulated variable), the temperature monitored by the second temperature controller 703 is used as the CV (controlled variable), and at the same time, the difference between the CV set value and the CV measured value is used as the DV (disturbance variable). When heating up, the CV set value can be automatically accumulated according to the desired heating rate. Due to the automatic accumulation of the CV set value, the deviation is used as the disturbance variable, thereby effectively eliminating this deviation to achieve stable control. For the second air intake mechanism 8, the control valve 702 with 6.0 Mpa is used as the MV (manipulated variable), the temperature monitored by the second temperature controller 703 is used as the CV (controlled variable), and at the same time, the difference between the CV set value and the CV measured value is used as the DV1 (disturbance variable 1), and the reactor inlet temperature is used as the DV2 (disturbance variable 2). When heating up, the CV set value can be automatically accumulated according to the desired heating rate. Due to the automatic accumulation of the CV set value, for the main controller 11, it is a ramp input, and the deviation is used as the disturbance variable, thereby effectively eliminating this deviation to achieve stable control. At the same time, when the heating rate at the reactor inlet changes, it can be fed forward to the main controller 11 C2 in a timely manner, and C2 makes a timely compensation by adjusting the 6.0 Mpa steam.
[0030] Specifically, through holes 13 are opened at positions on the side wall of the filter net sleeve 4 corresponding to the first air intake mechanism 7, the second air intake mechanism 8, and the air intake conduit 9.
[0031] In this embodiment, the through holes 13 enable the gases of the first air intake mechanism 7, the second air intake mechanism 8, and the air intake conduit 9 to directly enter the filter net sleeve 4.
[0032] Specifically, a slag discharge valve 14 is fixedly installed on the lower surface of the sealing cover 3.
[0033] In this embodiment, the slag discharge valve 14 is inclined to discharge the filtered impurities.
[0034] During use, in the first air intake mechanism 7, the control valve 702 on the steam pipe 701 at 5.0 Mpa is used as the MV (manipulated variable), the temperature monitored by the second temperature controller 703 is used as the CV (controlled variable), and at the same time, the difference between the CV set value and the CV measured value is used as the DV (disturbance variable). When heating up, the CV set value can be automatically accumulated according to the desired heating rate. Due to the automatic accumulation of the CV set value, the deviation is used as the disturbance variable, thereby effectively eliminating the deviation to achieve stable control. In the second air intake mechanism 8, the control valve 702 at 6.0 Mpa is used as the MV (manipulated variable), the temperature monitored by the second temperature controller 703 is used as the CV (controlled variable), and at the same time, the difference between the CV set value and the CV measured value is used as the DV1 (disturbance variable 1), and the reactor inlet temperature is used as the DV2 (disturbance variable 2). When heating up, the CV set value can be automatically accumulated according to the desired heating rate. Due to the automatic accumulation of the CV set value, for the main controller 11, it is a ramp input, and the deviation is used as the disturbance variable, thereby effectively eliminating the deviation to achieve stable control. At the same time, when the heating rate at the reactor inlet changes, it can be fed forward to the main controller 11C2 in a timely manner, and C2 makes up for it in a timely manner by adjusting the 6.0 Mpa steam, so as to achieve a stable heating rate of the catalyst in the tank body 1, reduce the influence of the thermal stress generated by the temperature rise change on the key equipment of the reactor, extend the equipment life, is conducive to improving the catalyst activity, realize the automatic control of the catalyst reduction process, is conducive to reducing the labor intensity of the operator, improve the automation level of the device. The filter net sleeve 4 can filter the impurities in the steam and the catalyst, and the turbine blade 503 in the rotating mechanism 5 rotates with the steam blown in by the first air intake mechanism 7 and the second air intake mechanism 8, so that the turbine blade 503 drives the transmission rod 501 to rotate in the bearing assembly 502, achieving the effect of stirring the gas. At the same time, it drives the fixed rod 601 in the cleaning mechanism 6 to rotate, so that the fixed rod 601 drives the scraper 602 to rotate, and the scraper 602 can scrape off the impurities on the inner wall of the filter net sleeve 4, increasing the cleaning function of the filter net sleeve 4, extending the service life, making the catalyst and the injected steam mix evenly and quickly, heating more comprehensively, at a higher speed, and improving the catalyst quality.
[0035] To sum up, this Fischer-Tropsch catalyst reduction reactor can achieve a stable heating rate, reduce the influence of the thermal stress generated by the temperature rise change on the key equipment of the reactor, extend the equipment life, is conducive to improving the catalyst activity, realize the automatic control of the catalyst reduction process, is conducive to reducing the labor intensity of the operator, improve the automation level of the device, and can filter the impurities in the steam and the catalyst, improving the catalyst quality.
[0036] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.
Claims
1. A Fischer-Tropsch catalyst reduction reactor, comprising a tank (1), characterized in that: A mesh cylinder (2) is fixedly mounted on the lower side wall of the tank body (1), a sealing cover (3) is threadedly mounted on the lower surface of the mesh cylinder (2), a filter mesh sleeve (4) is mounted between the upper surface of the sealing cover (3) and the upper inner wall of the mesh cylinder (2), a rotating mechanism (5) is mounted on the upper inner wall of the mesh cylinder (2), a cleaning mechanism (6) is mounted on the rotating mechanism (5), a first air intake mechanism (7) and a second air intake mechanism (8) are mounted on the left side wall of the tank body (1) in sequence from top to bottom, the first air intake mechanism (7) and the second air intake mechanism (8) are both fixedly connected to the left side wall of the mesh cylinder (2), an air intake duct (9) is fixedly mounted on the right side wall of the tank body (1) near the lower side, and the left end of the air intake duct (9) is fixedly connected to the right side wall of the mesh cylinder (2), an air outlet duct (10) is mounted on the right side wall of the tank body (1) near the upper side, and a main controller (11) and a first temperature controller (12) are arranged on the front side of the tank body (1).
2. A Fischer-Tropsch catalyst reduction reactor according to claim 1, characterized in that: The lower surface of the grid tube (2) is an open structure, and the upper surface of the grid tube (2) is a sealed structure.
3. A Fischer-Tropsch catalyst reduction reactor according to claim 1, characterized in that: The rotating mechanism (5) comprises a transmission rod (501), a bearing assembly (502) and a turbine blade (503); the upper end of the transmission rod (501) is mounted on the upper inner wall of the grid cylinder (2) via the bearing assembly (502); and turbine blades (503) are fixedly mounted on the transmission rod (501) at positions corresponding to the first air intake mechanism (7) and the second air intake mechanism (8).
4. A Fischer-Tropsch catalyst reduction reactor according to claim 1, characterized in that: The cleaning mechanism (6) comprises a fixed rod (601) and a scraper (602); the fixed rod (601) is fixedly mounted on the left and right sides of the transmission rod (501), respectively; the fixed rod (601) is fixedly mounted with a scraper (602); the scraper (602) is movably fitted to the inner wall of the filter sleeve (4).
5. The Fischer-Tropsch catalyst reduction reactor according to claim 1, characterized in that: The first air intake mechanism (7) comprises a steam pipe (701), a control valve (702) and a second temperature controller (703); the steam pipe (701) is installed on the left side wall of the tank body (1), and the right end of the steam pipe (701) is embedded in the left side wall of the grid tube (2); the control valve (702) and the second temperature controller (703) are installed on the steam pipe (701); and the second air intake mechanism (8) has the same structure as the first air intake mechanism (7).
6. A Fischer-Tropsch catalyst reduction reactor according to claim 1, characterized in that: Through holes (13) are provided on the side wall of the filter mesh sleeve (4) at positions corresponding to the first air intake mechanism (7), the second air intake mechanism (8) and the air intake duct (9).
7. A Fischer-Tropsch catalyst reduction reactor according to claim 1, characterized in that: A slag discharge valve (14) is fixedly mounted on the lower surface of the sealing cover (3).