Multi-stage gas-solid loop reactor
By designing a multi-stage gas-solid loop reactor, the problems of uneven gas distribution, bed wear and uneven heat and mass transfer in the existing gas-solid fluidized bed reactor are solved, effective contact and reaction between the gas and solid phases are achieved, gas utilization and product yield are improved, and energy consumption is reduced.
Patent Information
- Application Number
- CN202422451504.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-10-11
AI Technical Summary
Existing gas-solid fluidized bed reactors have problems such as uneven gas distribution, bed wear, uneven heat and mass transfer, and severe backmixing of solid particles, which lead to inconsistent gas residence time inside the reactor and low conversion rate and yield in production applications.
A multi-stage gas-solid loop reactor is designed. By arranging multiple sections of single-stage loop structures consisting of a gas distributor, a guide baffle, a solid particle discharge port, an inner sleeve, bolts, a solid particle feed port and an outer sleeve in the reactor body, effective contact and reaction of the gas and solid phases are achieved, and a stirring effect is achieved through a circulation method, thereby increasing the gas-solid contact time and improving the heat and mass transfer efficiency.
The orderly directionality of the flow in the reactor is achieved, the irregular flow of gas phase and solid particles is reduced, the gas utilization rate and product yield are improved, the energy consumption is reduced, and the deposition of solid materials in the reactor is reduced.
Smart Images
Figure CN223351649U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of chemical gas-solid reaction, in particular to a multi-stage gas-solid loop reactor. Background Art
[0002] Prior art Gas-solid fluidized bed reactor is an important chemical equipment and is widely used in chemical reaction processes such as catalytic cracking, gasification, and combustion. Its working principle is based on the flow of gas and solid particles to achieve effective contact and reaction between the gas and solid phases.
[0003] However, existing gas-solid fluidized bed reactors have problems such as uneven gas distribution, bed wear and uneven heat and mass transfer, and severe backmixing of solid particles, which lead to inconsistent gas residence time inside the reactor, and in turn lead to low conversion rate and low yield in production applications.
[0004] Combining the above-mentioned problems, we can find that it is difficult to avoid the above-mentioned problems at the same time when the existing gas-solid fluidized bed reactors on the market are in use, and thus cannot achieve the desired effect. Therefore, we propose a multi-stage gas-solid circulation reactor that can achieve solid fluidization while achieving stirring effect through circulation, increase gas-solid contact time, improve heat transfer and mass transfer efficiency, and reduce dead zones and solid material deposition in the reactor. Utility Model Content
[0005] The purpose of the present utility model is to propose a multi-stage gas-solid loop reactor, which has the advantages of combining the advantages of a gas-solid fluidized bed reactor and a stirred tank reactor, and can achieve the effect of stirring by circulating while realizing solid fluidization, thereby increasing the gas-solid contact time, improving the heat transfer and mass transfer efficiency, reducing the dead zone and the deposition of solid materials in the reactor, and the multi-stage design makes the conditions in the reactor more controllable, ultimately achieving high gas utilization, high product yield, and low overall energy consumption. Compared with a stirred tank reactor, it does not have a complex mechanical structure, the shear stress in the reactor is also small, and the damage to solid particles is weakened. As a special fluidized bed, it is conducive to clean production and has good application prospects and value.
[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a multi-stage gas-solid loop reactor, comprising a reactor body, the reactor body comprising an outer sleeve, the interior of the outer sleeve being provided with an air inlet pipe, an air inlet distributor, a filler, a gas distributor, a guide baffle, a solid particle discharge port, an inner sleeve, bolts, a solid particle feed port and an air outlet pipe in order from bottom to top, the guide baffle being bolted to the top of the gas distributor, and the solid particle discharge port and the solid particle feed port being located between two adjacent gas distributors;
[0007] The outer sleeve is provided with a plurality of sections of single-stage circulation structures composed of a gas distributor, a flow guide baffle, a solid particle discharge port, an inner sleeve, bolts, a solid particle feed port and the outer sleeve;
[0008] The bolt is annularly threadedly connected to the interior of the inner sleeve, and the side of the bolt close to the outer sleeve is threadedly connected to the outer sleeve, forming an external annular gap between the outer sleeve and the inner sleeve;
[0009] The top of the air inlet pipe extends to the interior of the outer sleeve and is communicated with the air inlet distributor, and the air inlet pipe and the air inlet distributor constitute an air inlet system, and the filler and the bottom gas distributor constitute a gas distribution system.
[0010] The utility model is further configured as follows: the diameter ratio of the inner sleeve to the outer sleeve is 0.1-0.95.
[0011] The utility model is further configured as follows: the number of stages of the circulation structure formed by the gas distributor, the solid particle discharge port, the inner sleeve, the solid particle feed port, the bolts, the guide baffle and the outer sleeve is 2-15.
[0012] The utility model is further configured as follows: the hole spacing of the gas distributor is 2mm-10mm.
[0013] The utility model is further configured as follows: the opening rate of the gas distributor is 0.1-0.9.
[0014] The utility model is further configured as follows: the channel angle of the gas distributor is 15°-45°.
[0015] The utility model is further configured such that the included angle between the guide baffle and the gas distributor is 15°-75°.
[0016] The utility model is further configured as follows: the intake type of the intake pipe is reaction gas, inert gas, air, carbon dioxide, steam, nitrogen, carbon monoxide, and hydrogen.
[0017] The utility model is further configured as follows: the length-to-diameter ratio of the reactor body is 1.5-11.
[0018] A method for using a multi-stage gas-solid loop reactor comprises the following steps:
[0019] S1. During operation of the reactor body, gas enters the outer sleeve through the inlet pipe connected to the gas distributor, and is evenly distributed inside the outer sleeve through the gas distribution system consisting of the packing and the gas distributor. Solid particles enter the inner portion of the outer sleeve through the solid particle feed port.
[0020] S2. Due to the annular gap formed between each stage of the inner and outer sleeves, gas is primarily ejected upward from the bottom of the inner sleeve. During the gas flow, it carries solid particles toward the upper portion of the inner sleeve and diffuses them. These particles fall onto the material pile at the bottom of the annular gap, then collapse along the material accumulation angle and are carried to the gas outlet. There, they are carried back into the airflow and ejected upward again, forming a circular flow.
[0021] S3. The solid particles and gas after the reaction are discharged through the solid particle discharge port and the gas outlet pipe respectively.
[0022] In summary, the present invention has the following beneficial effects:
[0023] 1. The multi-stage gas-solid loop reactor is used in the chemical industry for gas-solid two-phase reactions, gas stripping, and heat extraction. It achieves orderly and directional flow within the reactor, reduces the irregular flow of gas and solid particles, and reduces the probability of bubbles coalescing to form large bubbles. It also solves the problems of high energy consumption and numerous dead zones in the original stirred tank reactor. At the same time, the internal shear stress of the reactor is low, which is of great significance to industries such as biomedicine.
[0024] 2. The integration of fluidized bed, solid separation and other systems saves process floor space, simplifies production equipment, reduces energy consumption, and reduces design and manufacturing costs and production operation costs;
[0025] 3. By adjusting the equipment structure parameters and process operation parameters, the bubble size and gas velocity can be controlled, the reaction contact area can be increased, the mass transfer efficiency can be improved, and the conversion rate, residence time and kinetic performance can be effectively controlled;
[0026] 4. The gas distributor can break up bubbles, make the gas flow in a uniformly distributed state, make the gas and solid phases fully contact, avoid dead zones, and prevent a certain amount of backmixing of solid particles. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0028] Figure 2 This is a schematic cross-sectional view of the reactor body of the present invention;
[0029] Figure 3 This is a schematic diagram of the structure of the gas distributor of the present utility model;
[0030] Figure 4 The utility model is a flow chart of a method for using a multi-stage gas-solid loop reactor.
[0031] Figure numerals: 1. Reactor body; 2. Outer sleeve; 3. Air inlet pipe; 4. Air inlet distributor; 5. Filler; 6. Gas distributor; 7. Guide baffle; 8. Solid particle discharge port; 9. Inner sleeve; 10. Bolt; 11. Solid particle feed port; 12. Air outlet pipe. DETAILED DESCRIPTION
[0032] The present invention will be described in further detail below with reference to the accompanying drawings.
[0033] refer to Figure 1-3 A multi-stage gas-solid loop reactor comprises a reactor body 1, the reactor body 1 comprises an outer sleeve 2, the interior of the outer sleeve 2 is provided with an air inlet pipe 3, an air inlet distributor 4, a filler 5, a gas distributor 6, a guide baffle 7, a solid particle discharge port 8, an inner sleeve 9, a bolt 10, a solid particle feed port 11 and an air outlet pipe 12 in order from bottom to top, the guide baffle 7 is bolted to the top of the gas distributor 6, and the solid particle discharge port 8 and the solid particle feed port 11 are located between two adjacent gas distributors 6;
[0034] The outer sleeve 2 is internally provided with a multi-stage single-stage circulation structure consisting of a gas distributor 6, a guide baffle 7, a solid particle discharge port 8, an inner sleeve 9, a bolt 10, a solid particle feed port 11 and the outer sleeve 2;
[0035] The bolt 10 is annularly threadedly connected to the interior of the inner sleeve 9, and the side of the bolt 10 close to the outer sleeve 2 is threadedly connected to it, forming an external annular gap between the outer sleeve 2 and the inner sleeve 9;
[0036] The top of the air inlet pipe 3 extends to the interior of the outer sleeve 2 and is connected to the air inlet distributor 4, and the air inlet pipe 3 and the air inlet distributor 4 constitute an air inlet system, and the filler 5 and the bottom gas distributor 6 constitute a gas distribution system, through the inner sleeve 9, the gas distributor 6, the solid particle feed port 11, the solid particle discharge port 8 and the guide baffle 7 and the inner part of the outer sleeve 2 to form a single-stage circulation structure, and is arranged in a multi-stage manner. It can achieve solid fluidization while achieving the stirring effect through circulation, increasing the gas-solid contact time, improving the heat transfer and mass transfer efficiency, reducing dead zones and solid material deposition in the reactor, combining the advantages of a gas-solid fluidized bed reactor and a stirred tank reactor, and the multi-stage design makes the conditions in the reactor more controllable, ultimately making the gas utilization rate high, the product yield large, and the overall energy consumption low. Compared with the stirred tank reactor, it does not have a complex mechanical structure, the shear stress in the reactor is also small, and the damage to the solid particles is weakened. As a special fluidized bed, it is conducive to clean production and has good application prospects and value.
[0037] The diameter ratio of the inner sleeve 9 to the outer sleeve 2 is 0.1-0.95.
[0038] The number of stages of the annular flow structure formed by the gas distributor 6, the solid particle discharge port 8, the inner sleeve 9, the solid particle feed port 11, the bolts 10, the guide baffle 7 and the outer sleeve 2 is 2-15.
[0039] The hole spacing of the gas distributor 6 is 2 mm to 10 mm.
[0040] The porosity of the gas distributor 6 is 0.1-0.9.
[0041] The channel angle of the gas distributor 6 is 15°-45°.
[0042] The included angle between the guide baffle 7 and the gas distributor 6 is 15°-75°.
[0043] The intake gas types of the intake pipe 3 are reaction gas, inert gas, air, carbon dioxide, steam, nitrogen, carbon monoxide, and hydrogen.
[0044] The reactor body 1 has an aspect ratio of 1.5-11.
[0045] Brief description of the use process: When the reactor body 1 is in operation, the gas enters the outer sleeve 2 through the connection between the air inlet pipe 3 and the air inlet distributor 4, and passes through the gas distribution system composed of the filler 5 and the gas distributor 6, so that the gas is evenly distributed inside the outer sleeve 2, and the solid particles enter the inner sleeve 2 through the solid particle feed port 11. Since an external annular gap is formed between each level of the inner sleeve 9 and the outer sleeve 2, and the air volume in the external annular gap is small, it acts as a loosening wind, so that the solid particles in the external annular gap can flow down, while the air volume entering the inner ring of the inner sleeve 9 is large, and since the air volume between the inner ring and the external annular gap is large, the solid particles in the outer sleeve 2 can flow down. The amount of air introduced is different, and there is a difference in gas content between the inner ring and the outer annular gap, which leads to different bulk densities of solid particles, and creates a pressure difference between the inner ring and the outer annular gap, thereby pushing the solid particles to flow upward from the inner ring, and then downward from the outer annular gap, and pass through the guide baffle 7 to make the solid particles flow to the inner sleeve 9, that is, forming a circular flow between the outer annular gap and the inner ring, so that the gas and solid particles undergo a gas-solid two-phase reaction operation between the corresponding inner sleeve 9 and the outer sleeve 2, and finally the reacted solid particles and gas are discharged through the solid particle discharge port 8 and the air outlet pipe 12 respectively.
[0046] like Figure 4 As shown, the utility model also provides a method for using a multi-stage gas-solid loop reactor, comprising the following steps:
[0047] S1. When the reactor body 1 is in operation, gas enters the outer sleeve 2 through the communication between the gas inlet pipe 3 and the gas distributor 4. The gas is evenly distributed inside the outer sleeve 2 through the gas distribution system composed of the packing 5 and the gas distributor 6. Solid particles are then introduced into the outer sleeve 2 through the solid particle feed port 11.
[0048] S2. Due to the annular gap formed between each stage of the inner sleeve 9 and the outer sleeve 2, gas is primarily ejected upward from the bottom of the inner sleeve. During the gas flow, it carries solid particles toward the upper portion of the inner sleeve and diffuses them. The solid particles fall onto the material pile at the bottom of the annular gap, then collapse along the material accumulation angle and are carried to the gas nozzle. They are then carried by the airflow and ejected upward again, forming a circular flow.
[0049] S3. The reacted solid particles and gas are discharged through the solid particle discharge port 8 and the gas outlet pipe 12 respectively.
[0050] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.
Claims
1. A multi-stage gas-solid loop reactor, comprising a reactor body (1), characterized in that: The reactor body (1) comprises an outer sleeve (2), wherein the interior of the outer sleeve (2) is provided with an air inlet pipe (3), an air inlet distributor (4), a filler (5), a gas distributor (6), a flow guide baffle (7), a solid particle discharge port (8), an inner sleeve (9), a bolt (10), a solid particle feed port (11) and an air outlet pipe (12) in order from bottom to top, wherein the flow guide baffle (7) is bolted to the top of the gas distributor (6), and the solid particle discharge port (8) and the solid particle feed port (11) are located between two adjacent gas distributors (6); The outer sleeve (2) is internally provided with a multi-stage single-stage circulation structure consisting of a gas distributor (6), a flow guide baffle (7), a solid particle discharge port (8), an inner sleeve (9), bolts (10), a solid particle feed port (11) and the outer sleeve (2); The bolt (10) is annularly threadedly connected to the interior of the inner sleeve (9), and the side of the bolt (10) close to the outer sleeve (2) is threadedly connected to it, forming an external annular gap between the outer sleeve (2) and the inner sleeve (9); The top of the air inlet pipe (3) extends to the interior of the outer sleeve (2) and is connected to the air inlet distributor (4), and the air inlet pipe (3) and the air inlet distributor (4) constitute an air inlet system, and the filler (5) and the bottom gas distributor (6) constitute a gas distribution system.
2. A multi-stage gas-solid loop reactor according to claim 1, characterized in that: The diameter ratio of the inner sleeve (9) to the outer sleeve (2) is 0.1-0.
95.
3. The multi-stage gas-solid loop reactor according to claim 1, characterized in that: The number of stages of the annular flow structure formed by the gas distributor (6), the solid particle discharge port (8), the inner sleeve (9), the solid particle feed port (11), the bolts (10), the flow guide baffle (7) and the outer sleeve (2) is 2-15.
4. The multi-stage gas-solid loop reactor according to claim 1, characterized in that: The hole spacing of the gas distributor (6) is 2 mm to 10 mm.
5. The multi-stage gas-solid loop reactor according to claim 1, characterized in that: The gas distributor (6) has an opening ratio of 0.1-0.
9.
6. The multi-stage gas-solid loop reactor according to claim 1, characterized in that: The channel angle of the gas distributor (6) is 15°-45°.
7. The multi-stage gas-solid loop reactor according to claim 1, characterized in that: The included angle between the guide baffle (7) and the gas distributor (6) is 15°-75°.
8. The multi-stage gas-solid loop reactor according to claim 1, characterized in that: The intake type of the intake pipe (3) is reaction gas, inert gas, air, carbon dioxide, steam, nitrogen, carbon monoxide, and hydrogen.
9. The multi-stage gas-solid loop reactor according to claim 1, characterized in that: The reactor body (1) has an aspect ratio of 1.5-11.