Improved regeneration chamber of reaction device for preparing low-carbon olefin through catalytic cracking of methanol

Abstract

The utility model discloses an improved regeneration chamber of a reaction device for preparing low-carbon olefin by catalytic cracking of methanol, which comprises an upper cylindrical section and a lower conical section which are vertically connected and internally communicated, the lower end of the lower conical section is connected with a gas inlet pipe, the cross section of the gas inlet pipe is rectangular, and a filter screen plate capable of being horizontally pushed and pulled to be replaced is arranged in the gas inlet pipe. The right side of the lower part of the upper cylindrical section is connected with a catalyst conveying pipe assembly; the upper end of the right side of the catalyst conveying pipe assembly is connected with a lower straight cylindrical pipe of the riser reactor. According to the utility model, improvement and optimization are carried out on the basis of the technical scheme with the patent application number of 202323341615.4, so that the whole reaction device for preparing low-carbon olefin by catalytic cracking of methanol is more energy-saving and environment-friendly, the production efficiency is improved, and the catalyst material and the production cost are saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of biomass synthesis gas, and in particular relates to an improved regeneration chamber of a methanol catalytic cracking and preparation of light olefins reaction device. Background Art

[0002] After long-term and systematic research, the technology of biomass (methanol is one of them) gasification to produce synthesis gas has become a major and effective method for producing synthesis gas. This process mainly involves the gasification and pyrolysis of biomass, and the carbon after pyrolysis and the supplied gasification medium undergo an oxidation-reduction reaction under high temperature and oxygen-deficient conditions to finally generate synthesis gas. This technology usually uses agricultural and forestry waste as raw materials to react and synthesize high-grade fuels, which is of great significance for energy conservation and environmental protection.

[0003] There are two main ways to prepare low-carbon olefins using syngas as raw material, namely, direct or indirect preparation of low-carbon olefins from syngas. Direct preparation of low-carbon olefins from syngas includes oxidation-molecular sieve (OX-ZEO) and Fischer-Tropsch synthesis of olefins (FTO). Indirect preparation of low-carbon olefins from syngas means that syngas is first synthesized into intermediate products such as methanol or dimethyl ether, and then low-carbon olefins are obtained through reactions, namely the MTO and DMTO processes.

[0004] The existing MTO reaction device has problems such as high energy consumption and high exhaust gas emissions. The Chinese utility model patent application number is 202323341615.4, which requests protection for a multi-stage riser reactor type methanol catalytic cracking to produce light olefins reaction device. However, there are still the following shortcomings in the actual application process:

[0005] 1) The inner space of the regeneration chamber is cylindrical, and the diameter of the main air inlet arranged in the middle of the bottom of the regeneration chamber is smaller than the inner diameter of the regeneration chamber. When high-temperature compressed air is injected into the regeneration chamber through the main air inlet, it is difficult for the compressed air to form an airflow at the outer edge of the bottom of the regeneration chamber. An annular dead angle area is formed here, which affects the regeneration effect of the catalyst. The catalyst that falls into the dead angle area is difficult to reuse, and it is not convenient to clean the catalyst that falls into the dead angle area, resulting in a waste of catalyst raw materials.

[0006] 2) The inlet of the catalyst delivery pipe passes through the bottom of the regeneration chamber from bottom to top, and the opening of the inlet end of the catalyst delivery pipe faces upward. Under the positive pressure of the high-temperature compressed air, the catalyst enters the lower straight tube through the catalyst delivery pipe. Since the catalyst is transported under positive pressure and the catalyst delivery pipe is a curved structure below the regeneration chamber, the catalyst transportation effect is not good, especially when the second plug valve is closed, the catalyst in the catalyst delivery pipe will be deposited on the curved structure, thus affecting the normal transportation of the catalyst after the second plug valve is opened next time; in addition, during the closing process of the second plug valve, since the opening of the inlet end of the catalyst delivery pipe faces upward, unregenerated catalyst will fall into the catalyst delivery pipe. After the second plug valve is opened, it will fall into the curved structure and block the catalyst delivery pipe. Compressed air with a higher pressure is required to achieve permeability at the curved structure. Utility Model Content

[0007] In order to solve the deficiencies in the prior art, the utility model provides an improved regeneration chamber for a methanol catalytic cracking reaction device for producing low-carbon olefins, which has no dead angle area, good regeneration effect, and smoother upward lifting of the catalyst after regeneration.

[0008] In order to solve the above technical problems, the utility model adopts the following technical scheme: an improved regeneration chamber of a methanol catalytic cracking reaction device for producing low-carbon olefins, comprising an upper cylindrical section and a lower conical section which are connected to each other internally, the lower end of the lower conical section is connected to an air inlet pipe, the cross-section of the air inlet pipe is rectangular, a filter plate which can be horizontally pushed and pulled for replacement is provided in the air inlet pipe, a catalyst delivery pipe assembly is connected to the right side of the lower part of the upper cylindrical section, and the upper right end of the catalyst delivery pipe assembly is connected to the lower straight tube of the riser reactor.

[0009] A long hole is opened horizontally on the right side of the upper part of the intake pipe, and a number of cross bars are evenly spaced along the left and right directions in the intake pipe, and the length direction of each cross bar is horizontally arranged along the front-to-back direction. At least two rollers are installed on each cross bar, and the tops of all the rollers are at the same height as the lower edges of the long holes. The filter plate passes through the long holes from right to left and extends into the intake pipe, and the right side of the filter plate is located outside the intake pipe, and the left side, front side and rear side of the filter plate are in contact with the left side, front side and rear side of the inner wall of the intake pipe respectively. A limit block in contact with the left top surface of the filter plate is fixedly provided on the left side of the inner wall of the intake pipe, and an easily removable sealing component for sealing the gap between the filter plate and the long holes is fixedly provided on the outside of the right side of the intake pipe.

[0010] The easily removable sealing assembly includes a rectangular pressure plate and a plurality of screw rods. The length direction of the screw rods is horizontally arranged in the left-right direction. The left end of the screw rod is fixedly connected to the outer wall of the right side of the intake pipe and is respectively located at the upper and lower parts of the long hole. A long groove for accommodating the protruding long hole part of the right side of the filter plate is provided on the left side of the rectangular pressure plate. A rubber pad located around the long groove is bonded and fixed on the left side of the rectangular pressure plate. Through holes corresponding to the screw rods are provided on the rectangular pressure plate and the rubber pad. The screw rod passes through the through holes. The right end of the screw rod is threadedly connected to a nut crimped to the right side of the rectangular pressure plate. Under the action of the nut on the top pressure of the rectangular pressure plate, the rubber pad is pressed tightly against the right side of the intake pipe.

[0011] The catalyst delivery tube assembly includes two arc tubes and an oblique straight tube. The two arc tubes are symmetrically arranged front to back. The arc tubes are arranged along the outer circle of the upper cylindrical section. The front arc tube is low in front and high in back, and the rear arc tube is high in front and low in back. The rear port of the front arc tube, the front port of the rear arc tube and the lower left port of the oblique straight tube are connected to each other. The front port of the front arc tube and the rear port of the rear arc tube are both blocked. At least one hole is opened on the upper cylindrical section to communicate with the front arc tube, and at least one hole is opened on the upper cylindrical section to communicate with the rear arc tube. The upper right port of the oblique straight tube is connected to the lower straight tube of the riser reactor.

[0012] The oblique straight pipe is provided with a solenoid valve and an air pump located above the solenoid valve.

[0013] By adopting the above technical solution, the utility model has the following technical effects:

[0014] 1) Since the lower part of the regeneration chamber is set as a lower conical section with a thick upper part and a thin lower part, a dead angle area is avoided at the outer edge of the bottom surface of the regeneration chamber. High-temperature compressed air is blown upward through the air inlet pipe to blow up the catalyst that falls into the lower conical section. The catalyst is reduced and regenerated after being heated. The generated flue gas enters the third cyclone separator vertically set at the upper right part of the regeneration chamber. Under the action of compressed air, the third cyclone separator automatically rotates to separate the flue gas and the catalyst. The separated catalyst falls into the lower conical section, and the flue gas is discharged from the exhaust gas outlet pipe.

[0015] 2) If the air permeability of the filter plate is poor, shut down the equipment, replace the filter plate, and clean the catalyst deposited in the lower cone section. The specific operation process is: first separate the lower port of the intake pipe from the compressed air inlet pipe, place a receiving bucket under the lower port of the intake pipe, and then use a wrench to loosen the nut on the right side of the rectangular pressing plate, remove the rectangular pressing plate and rubber pad from the screw, and then pull the filter plate to the right. The catalyst falls into the receiving bucket through the intake pipe. Then clean the filter plate or replace it with a new one. Push the cleaned filter plate or the new filter plate from the long hole to the left into the intake pipe. The setting of the roller plays a good guiding role in the installation of the filter plate until the left side of the filter plate contacts the left side of the inner wall of the intake pipe and stops. Install the rectangular pressing plate, screw the nut on the right end of the screw, and the nut presses the rectangular pressing plate. The rectangular pressing plate presses the rubber pad tightly on the right side of the intake pipe, thereby sealing the gap between the filter plate and the long hole.

[0016] 3) The catalyst delivery pipe assembly uses two arc-shaped pipes with low air inlet and high air outlet and one oblique straight pipe. When the solenoid valve is closed, the catalyst trapped in the arc-shaped pipe and the oblique straight pipe will automatically slide into the regeneration chamber, thereby avoiding the deposition of catalyst in the pipe below the solenoid valve. An air pump is added to the oblique straight pipe. The negative pressure suction of the air pump and the positive pressure high-temperature compressed air injected into the air inlet pipe at the bottom of the regeneration chamber work together (the positive pressure high-temperature compressed air mainly blows the catalyst upward to keep the catalyst in a suspended state), making the upward lifting of the catalyst smoother after regeneration. The holes opened on the upper cylindrical section that are connected to the two arc-shaped pipes are more numerous and more dispersed, which also improves the catalyst lifting amount and work efficiency.

[0017] In summary, the utility model improves and optimizes the technical solution of patent application number 202323341615.4, making the entire methanol catalytic cracking reaction device to produce low-carbon olefins more energy-saving and environmentally friendly, and improves production efficiency, saving catalyst materials and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 for Figure 1 A top view of the catalyst delivery tube assembly;

[0020] Figure 3 for Figure 1 An enlarged view of the easily removable sealing assembly;

[0021] Figure 4 for Figure 2 A right side view of the catalyst delivery pipe assembly;

[0022] Figure 5 for Figure 4 Enlarged view of the easily removable seal assembly. DETAILED DESCRIPTION

[0023] like Figure 1-Figure 5 As shown, the improved regeneration chamber of the methanol catalytic cracking reaction device for producing low-carbon olefins of the utility model comprises an upper cylindrical section 1 and a lower conical section 2 which are connected to each other and penetrate the interior thereof, the lower end of the lower conical section 2 is connected to an air intake pipe 3, the cross section of the air intake pipe 3 is rectangular, a filter plate 4 which can be horizontally pushed and pulled for replacement is arranged in the air intake pipe 3, and a catalyst delivery pipe assembly is connected to the lower right side of the upper cylindrical section 1.

[0024] A long hole is opened horizontally on the upper right side of the air intake pipe 3. A plurality of cross bars 5 are evenly spaced in the left-right direction inside the air intake pipe 3. The length direction of each cross bar 5 is horizontally arranged in the front-back direction. At least two rollers 6 are installed on each cross bar 5. The tops of all rollers 6 are at the same height as the lower edge of the long hole. The filter plate 4 passes through the long hole from right to left and extends into the air intake pipe 3. The right side of the filter plate 4 is located outside the air intake pipe 3. The left side, front side and rear side of the filter plate 4 are in contact with the left side, front side and rear side of the inner wall of the air intake pipe 3 respectively. A stopper 7 in contact with the left top surface of the filter plate 4 is fixed on the left side of the inner wall of the air intake pipe 3. An easily removable sealing component 8 for sealing the gap between the filter plate 4 and the long hole is fixed on the right side of the air intake pipe 3. The roller 6, the stopper 7 and the long hole define the upper and lower positions of the filter plate 4.

[0025] The easily removable sealing assembly 8 includes a rectangular pressing plate 9 and a plurality of screws 10. The length direction of the screw 10 is horizontally arranged in the left-right direction. The left end of the screw 10 is fixedly connected to the right outer wall of the intake pipe 3 and is respectively located at the upper and lower parts of the long hole. A long groove 11 is provided on the left side of the rectangular pressing plate 9 for accommodating the protruding long hole part on the right side of the filter plate 4. A rubber pad 12 located around the long groove 11 is bonded and fixed on the left side of the rectangular pressing plate 9. Through holes corresponding to the screw 10 are provided on the rectangular pressing plate 9 and the rubber pad 12. The screw 10 passes through the through holes. The right end of the screw 10 is threadedly connected to a nut 13 crimped to the right side of the rectangular pressing plate 9. Under the action of the top pressure of the nut 13 on the rectangular pressing plate 9, the rubber pad 12 is pressed tightly against the right side of the intake pipe 3.

[0026] The catalyst delivery tube assembly includes two arc tubes 14 and an oblique straight tube 15. The two arc tubes 14 are symmetrically arranged front to back. The arc tubes 14 are arranged along the outer circle of the upper cylindrical section 1. The front arc tube 14 is low in front and high in back, and the rear arc tube 14 is high in front and low in back. The rear port of the front arc tube 14, the front port of the rear arc tube 14 and the lower left port of the oblique straight tube 15 are connected to each other. The front port of the front arc tube 14 and the rear port of the rear arc tube 14 are both blocked. At least one hole is opened on the upper cylindrical section 1 to communicate with the front arc tube 14, and at least one hole is opened on the upper cylindrical section 1 to communicate with the rear arc tube 14. The upper right port of the oblique straight tube 15 is connected to the lower straight tube 16 of the riser reactor.

[0027] The oblique straight pipe 15 is provided with a solenoid valve 17 and an air pump 18 located above the solenoid valve 17 .

[0028] The working principle of the utility model and its technical effects are as follows:

[0029] 1) The catalyst to be regenerated after stripping slowly falls into the discharge pipe 21 through the screen 22, and then enters the lower conical section 2 of the regeneration chamber through the lower end of the discharge pipe 21. Since the lower part of the regeneration chamber is set as the lower conical section 2 with a thick upper part and a thin lower part, it is avoided to form a dead angle area at the outer edge of the bottom surface of the regeneration chamber. The high-temperature compressed air blows upward through the air inlet pipe 3 to blow up the catalyst that falls into the lower conical section 2. The catalyst is reduced and regenerated after being heated, and the generated flue gas enters the third cyclone separator 19 vertically arranged in the upper right part of the regeneration chamber. Under the action of compressed air, the third cyclone separator 19 automatically rotates to separate the flue gas and the catalyst. The separated catalyst falls into the lower conical section 2, and the flue gas is discharged from the exhaust gas outlet pipe 20.

[0030] 2) If the air permeability of the filter plate 4 is poor, shut down the equipment, replace the filter plate 4, and clean the catalyst deposited in the lower conical section 2. The specific operation process is: first separate the lower port of the intake pipe 3 from the compressed air inlet pipe, place a receiving bucket under the lower port of the intake pipe 3, and then use a wrench to loosen the nut 13 on the right side of the rectangular pressing plate 9, remove the rectangular pressing plate 9 and the rubber pad 12 from the screw 10, and then pull the filter plate 4 to the right. The catalyst falls into the receiving bucket through the intake pipe 3, and then the filter The plate 4 is cleaned or replaced with a new filter plate 4, and the cleaned filter plate 4 or the new filter plate 4 is pushed to the left from the long hole into the intake pipe 3. The setting of the roller 6 plays a good guiding role in the installation of the filter plate 4, until the left side of the filter plate 4 contacts the left side of the inner wall of the intake pipe 3 and stops, and the rectangular pressing plate 9 is installed, and the nut 13 is screwed on the right end of the screw 10. The nut 13 presses the rectangular pressing plate 9, and the rectangular pressing plate 9 presses the rubber pad 12 tightly on the right side of the intake pipe 3, thereby sealing the gap between the filter plate 4 and the long hole.

[0031] 3) The catalyst delivery pipe assembly adopts two arc-shaped pipes 14 with low air inlet and high air outlet and one oblique straight pipe 15. When the solenoid valve 17 is closed, the catalyst trapped in the arc-shaped pipe 14 and the oblique straight pipe 15 will automatically slide into the regeneration chamber, thereby avoiding the deposition of catalyst in the pipe below the solenoid valve 17. An air pump 18 is added to the oblique straight pipe 15. The negative pressure suction of the air pump 18 and the positive pressure high temperature compressed air injected from the air inlet pipe 3 at the bottom of the regeneration chamber work together (the positive pressure high temperature compressed air mainly blows the catalyst upward to put the catalyst in a suspended state), so that the catalyst can be lifted upward more smoothly after regeneration. The holes opened on the upper cylindrical section 1 that are connected to the two arc-shaped pipes 14 are more numerous and more dispersed, which also improves the catalyst lifting amount and work efficiency.

[0032] The above two embodiments do not impose any formal restrictions on the shape, material, structure, etc. of the utility model. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model belong to the protection scope of the technical solution of the utility model.

Claims

1. Improved regeneration chamber of methanol catalytic cracking to produce light olefins reaction device, characterized by: It includes an upper cylindrical section and a lower conical section which are connected to each other internally. The lower end of the lower conical section is connected to an air intake pipe. The cross-section of the air intake pipe is rectangular. A filter plate which can be pushed and pulled horizontally for replacement is provided in the air intake pipe. The right side of the lower part of the upper cylindrical section is connected to a catalyst delivery pipe assembly. The upper right end of the catalyst delivery pipe assembly is connected to the lower straight tube of the riser reactor.

2. The improved regeneration chamber of the methanol catalytic cracking to produce light olefins reaction device according to claim 1 is characterized by: A long hole is opened horizontally on the right side of the upper part of the intake pipe, and a number of cross bars are evenly spaced along the left and right directions in the intake pipe, and the length direction of each cross bar is horizontally arranged along the front-to-back direction. At least two rollers are installed on each cross bar, and the tops of all the rollers are at the same height as the lower edges of the long holes. The filter plate passes through the long holes from right to left and extends into the intake pipe, and the right side of the filter plate is located outside the intake pipe, and the left side, front side and rear side of the filter plate are in contact with the left side, front side and rear side of the inner wall of the intake pipe respectively. A limit block in contact with the left top surface of the filter plate is fixedly provided on the left side of the inner wall of the intake pipe, and an easily removable sealing component for sealing the gap between the filter plate and the long holes is fixedly provided on the outside of the right side of the intake pipe.

3. The improved regeneration chamber of the methanol catalytic cracking to produce light olefins reaction device according to claim 2 is characterized by: The easily removable sealing assembly includes a rectangular pressure plate and a plurality of screw rods. The length direction of the screw rods is horizontally arranged in the left-right direction. The left end of the screw rod is fixedly connected to the outer wall of the right side of the intake pipe and is respectively located at the upper and lower parts of the long hole. A long groove for accommodating the protruding long hole part of the right side of the filter plate is provided on the left side of the rectangular pressure plate. A rubber pad located around the long groove is bonded and fixed on the left side of the rectangular pressure plate. Through holes corresponding to the screw rods are provided on the rectangular pressure plate and the rubber pad. The screw rod passes through the through holes. The right end of the screw rod is threadedly connected to a nut crimped to the right side of the rectangular pressure plate. Under the action of the nut on the top pressure of the rectangular pressure plate, the rubber pad is pressed tightly against the right side of the intake pipe.

4. The improved regeneration chamber of the methanol catalytic cracking to produce light olefins reaction device according to any one of claims 1 to 3, characterized in that: The catalyst delivery tube assembly includes two arc tubes and an oblique straight tube. The two arc tubes are symmetrically arranged front to back. The arc tubes are arranged along the outer circle of the upper cylindrical section. The front arc tube is low in front and high in back, and the rear arc tube is high in front and low in back. The rear port of the front arc tube, the front port of the rear arc tube and the lower left port of the oblique straight tube are connected to each other. The front port of the front arc tube and the rear port of the rear arc tube are both blocked. At least one hole is opened on the upper cylindrical section to communicate with the front arc tube, and at least one hole is opened on the upper cylindrical section to communicate with the rear arc tube. The upper right port of the oblique straight tube is connected to the lower straight tube of the riser reactor.

5. The improved regeneration chamber of the methanol catalytic cracking to produce light olefins reaction device according to claim 4 is characterized by: The oblique straight pipe is provided with a solenoid valve and an air pump located above the solenoid valve.

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