Two-stage fluidized bed series drying and cooling system
By adopting a two-stage fluidized bed series drying and cooling system and an independent gas circulation system in the fluidized bed drying system, the problem of static electricity and dust generated by the powder after drying is solved, and the drying and cooling effect with low exhaust emissions and high safety and environmental protection is achieved.
Patent Information
- Application Number
- CN202420560085.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-03-21
AI Technical Summary
During the fluidized bed drying process, the material has good stability before drying, but after drying, the powder is prone to static electricity and dust, resulting in dust problems. The existing technology is difficult to effectively solve this problem.
A two-stage fluidized bed series drying and cooling system is adopted, and the internal heat drying bed and the internal heat cooling bed are independent gas circulation systems. The heat circulation uses air and the cold circulation uses nitrogen, and strictly zoning and recycling to reduce exhaust emissions.
It realizes strict zoning recycling of drying and cooling, reduces exhaust emissions, improves the safety and environmental protection of the system, and has good adjustability of drying and cooling, and controllable product quality.
Smart Images
Figure CN222598224U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a powder material drying system, in particular to a two-stage fluidized bed series drying and cooling system. Background Art
[0002] Some wet materials have different characteristics before and after fluidized bed drying. Before drying, the materials are more stable and less likely to generate dust. After drying, the powders are prone to static electricity and dust clouds. Therefore, air environment is used for drying and nitrogen environment is used for cooling. Therefore, it is of great significance to develop a two-stage fluidized bed series drying and cooling method. Utility Model Content
[0003] The utility model aims to provide a two-stage fluidized bed series drying and cooling system for drying and cooling materials.
[0004] To achieve the above-mentioned purpose, the utility model provides a two-stage fluidized bed series drying and cooling system, which includes: an internal heating drying bed, a drying cyclone dust collector, a washing tower, an internal heating cooling bed, a cooling bag dust collector and a surface cooler; the drying cyclone dust collector is connected to the top of the internal heating drying bed, the bottom of the washing tower is connected to the top of the drying cyclone dust collector, and the discharge port of the internal heating drying bed is connected to the internal heating cooling bed; the top of the washing tower is connected to the bottom of the internal heating drying bed; the top of the internal heating cooling bed is connected to the cooling bag dust collector, the surface cooler is connected to the top of the cooling bag dust collector, and the surface cooler is also connected to the internal heating cooling bed, and the carrier gas in the internal heating cooling bed is returned to the internal heating cooling bed for recycling after being processed by the cooling bag dust collector and the surface cooler.
[0005] In one embodiment, the top of the internal heating cooling bed is connected to the discharge port of the internal heating drying bed, and the discharge port of the internal heating drying bed is also provided with a drying discharge valve.
[0006] In one embodiment, a drying cyclone discharge valve is provided on the pipeline connecting the drying cyclone dust collector and the internal heating drying bed, and another pipeline is provided on the top of the drying cyclone dust collector to connect with the top of the internal heating drying bed; a feed port is provided on the top of the internal heating drying bed, and the feed port is connected to the disperser.
[0007] In one embodiment, a drying circulation fan and a heater are provided on a pipeline connecting the top of the scrubbing tower and the bottom of the internal heating drying bed; the drying circulation fan is also connected to an air filter; the hot carrier gas in the internal heating drying bed passes through the scrubbing tower, the drying circulation fan and the heater, and then returns to the internal heating drying bed for recycling.
[0008] In one embodiment, a washing pump and a cooler are further provided, one end of the washing pump is connected to the bottom of the cooler, and the other end of the washing pump is connected to the bottom of the washing tower; the top of the cooler is connected to the lower part, the middle part, and the upper part of the washing tower; the circulating low-temperature water is input from the lower part of the cooler and then output from the upper part of the cooler.
[0009] In one embodiment, the heat medium of the internal heating drying bed is 0.7-1.3MPa steam or electricity; when the heat medium of the internal heating drying bed is steam; a steam coil is provided in the internal heating drying bed, and the number of the steam coils is one, two, or more; low-pressure steam is input from one end of the steam coil and output from the other end of the steam coil; the low-pressure steam is used to dry the material in the internal heating drying bed.
[0010] In one embodiment, a cooling water coil or a chilled water coil is provided in the internal heat cooling bed. The number of the cooling water coil or the chilled water coil is one, two, or more. The cooling water coil or the chilled water coil has circulating cooling water input, and the circulating cooling water is used to cool the material in the internal heat cooling bed.
[0011] In one embodiment, a cooling discharge valve is provided at the discharge port of the internal heating cooling bed, and the cooled material is output from the discharge port of the internal heating cooling bed and discharged through the cooling discharge valve; a cooling bag discharge valve is provided at the bottom of the cooling bag dust collector, and the cooling bag discharge valve is connected to the discharge port of the internal heating cooling bed, and the dust falling through the cooling bag discharge valve is sent to the discharge box of the internal heating cooling bed.
[0012] In one embodiment, a cooling circulation fan is provided on the pipeline connecting the cooling bag dust collector and the surface cooler; circulating low-temperature water is input from the top of the surface cooler and then output from the bottom of the surface cooler; a waste water outlet is also provided at the bottom of the surface cooler; and a nitrogen inlet is also provided at the top of the cooling bag dust collector.
[0013] In one embodiment, the scrubbing tower is a plate tower or a packed tower.
[0014] Compared with the prior art, the utility model has at least the following advantages:
[0015] 1. The internal heating drying bed and the internal heating cooling bed of the utility model adopt independent gas circulation systems. The two circulation systems do not interfere with each other. The hot cycle and the cold cycle are strictly zoned and recycled. The hot cycle uses air as a carrier gas, and the cold cycle uses nitrogen as a carrier gas. The exhaust gas emission is small. Only the internal heating cooling bed consumes nitrogen. The nitrogen consumption is low, which is safer and more environmentally friendly.
[0016] 2. The two-stage fluidized bed series drying and cooling process is adopted, with good adjustability of drying and cooling and controllable product quality.
[0017] 3. The two-stage fluidized bed series drying and cooling system of the utility model fully considers the phenomenon of most powdered high-temperature materials sticking to the materials, and adopts two methods for dehumidification respectively. It has higher operational reliability and can run continuously. It has the advantages of simple operation, high degree of automation, and small exhaust emissions. It can be widely promoted and applied to the deep drying of materials such as resins, nylon, polyethylene, adipic acid, and inorganic salts, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0019] Figure 1 It is a structural schematic diagram of a two-stage fluidized bed series drying and cooling system according to an embodiment of the utility model;
[0020] Among them, the accompanying drawings illustrate: a disperser 1; an internally heated drying bed 2; a drying cyclone dust collector 3; a drying cyclone discharge valve 4; a washing tower 5; a washing pump 6; a cooler 7; an air filter 8; a drying circulation fan 9; a heater 10; a drying discharge valve 11; an internally heated cooling bed 12; a cooling bag dust collector 13; a cooling bag discharge valve 14; a cooling circulation fan 15; a surface cooler 16; and a cooling discharge valve 17. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0022] Figure 1 The schematic diagram of the structure of a two-stage fluidized bed series drying and cooling system of an embodiment of the utility model is as follows. The two-stage fluidized bed series drying and cooling system of the utility model comprises an internal heating drying bed 2, a drying cyclone dust collector 3, a washing tower 5, an internal heating cooling bed 12, a cooling bag dust collector 13 and a surface cooler 16.
[0023] The drying cyclone dust collector 3 is connected to the top of the internal heating drying bed 2, the bottom of the washing tower 5 is connected to the top of the drying cyclone dust collector 3, the discharge port of the internal heating drying bed 2 is connected to the internal heating cooling bed 12; the top of the washing tower 5 is connected to the bottom of the internal heating drying bed 2.
[0024] The top of the internal heating cooling bed 12 is connected to the cooling bag dust collector 13, the surface cooler 16 is connected to the top of the cooling bag dust collector 13, and the surface cooler 16 is also connected to the internal heating cooling bed 12. The carrier gas in the internal heating cooling bed 12 is processed by the cooling bag dust collector 13 and the surface cooler 16 and then returns to the internal heating cooling bed 12 for recycling.
[0025] Preferably, the top of the internal heating cooling bed 12 is connected to the discharge port of the internal heating drying bed 2 , and the discharge port of the internal heating drying bed 2 is also provided with a drying discharge valve 11 .
[0026] Preferably, a drying cyclone discharge valve 4 is provided on the pipeline connecting the drying cyclone dust collector 3 and the internally heated drying bed 2, and another pipeline is provided on the top of the drying cyclone dust collector 3 to connect with the top of the internally heated drying bed 2; a feed port is provided on the top of the internally heated drying bed 2, and the feed port is connected with the disperser 1. The material is input into the disperser 1, and enters the internally heated drying bed 2 after being dispersed by the disperser 1.
[0027] Preferably, a drying circulation fan 9 and a heater 10 are provided on a pipeline connecting the top of the washing tower 5 and the bottom of the internal heating drying bed 2; the drying circulation fan 9 is also connected to the air filter 8; the hot carrier gas in the internal heating drying bed 2 passes through the washing tower 5, the drying circulation fan 9 and the heater 10, and then returns to the internal heating drying bed 2 for recycling.
[0028] Preferably, a washing pump 6 and a cooler 7 are also provided, one end of the washing pump 6 is connected to the bottom of the cooler 7, and the other end of the washing pump 6 is connected to the bottom of the washing tower 5; the top of the cooler 7 is connected to the lower part, the middle part and the upper part of the washing tower 5; the circulating low-temperature water is input from the lower part of the cooler 7 and then output from the upper part of the cooler 7.
[0029] Preferably, the heat medium of the internal heating drying bed 2 is 0.7-1.3MPa steam or electricity; when the heat medium of the internal heating drying bed 2 is steam; a steam coil is provided in the internal heating drying bed 2, and the number of the steam coils is one, two, or more; low-pressure steam is input from one end of the steam coil and output from the other end of the steam coil; the low-pressure steam is used to dry the material in the internal heating drying bed 2.
[0030] Preferably, a cooling water coil or a chilled water coil is provided in the internal heat cooling bed 12, and the number of the cooling water coil or the chilled water coil is one, two, or more. There is circulating cooling water input in the cooling water coil or the chilled water coil, and the circulating cooling water is used to cool the material in the internal heat cooling bed 12.
[0031] Preferably, a cooling discharge valve 17 is provided at the discharge port of the internal heating cooling bed 12, and the cooled material is output from the discharge port of the internal heating cooling bed 12 and discharged through the cooling discharge valve 17; a cooling bag discharge valve 14 is provided at the bottom of the cooling bag dust collector 13, and the cooling bag discharge valve 14 is connected to the discharge port of the internal heating cooling bed 12, and the dust falling through the cooling bag discharge valve 14 is sent to the discharge box of the internal heating cooling bed 12.
[0032] Preferably, a cooling circulation fan 15 is provided on the pipeline connecting the cooling bag dust collector 13 and the surface cooler 16; circulating low-temperature water is input from the top of the surface cooler 16 and then output from the bottom of the surface cooler 16; a wastewater outlet is also provided at the bottom of the surface cooler 16; and a nitrogen inlet is also provided at the top of the cooling bag dust collector 13.
[0033] Preferably, the washing tower 5 is a plate tower or a packed tower.
[0034] The internal heating drying bed 2 and the internal heating cooling bed 12 use their own independent gas circulation systems. The gas circulation process in the internal heating drying bed 2 is as follows: After the hot carrier gas at 75-95°C in the internal heating drying bed 2 dries the material in the internal heating drying bed 2, the hot carrier gas is collected at the top of the internal heating drying bed 2, and then the hot carrier gas passes through the drying cyclone dust collector 3 and the washing tower 5 in turn for dust removal and dehumidification. After dust removal and dehumidification, the carrier gas temperature drops to 25-35°C, and after being pressurized to 5-8kPa by the drying circulation fan 9 and heated to 135-150°C by the heater 10, it returns to the internal heating drying bed 2 for recycling. In addition, the outside air is regularly input through the air filter 8, and after being pressurized by the drying circulation fan 9 and heated by the heater 10, it is input into the internal heating drying bed 2, thereby replenishing fresh air for the internal heating drying bed 2, and the excess exhaust gas is discharged from the outlet of the drying circulation fan 9.
[0035] The gas circulation process in the internal heat cooling bed 12 is as follows: the carrier gas at 45-50°C in the internal heat cooling bed 12 is collected at the top of the internal heat cooling bed 12, and then input into the cooling bag dust collector 13, the carrier gas is dusted in the cooling bag dust collector 13, the dust collected in the cooling bag dust collector 13 is unloaded through the cooling bag discharge valve 14 and input into the discharge box of the internal heat cooling bed 12; the carrier gas after dust removal is pressurized to 5-8kPa by the cooling circulation fan 15 and condensed and dehumidified by the surface cooler 16 and cooled to 15-20°C, and then returned to the internal heat cooling bed 12 for recycling. In addition, low-pressure nitrogen is regularly added to the internal heat cooling bed 12, and the cooling bag dust collector 13 uses low-pressure nitrogen as a purge gas, and the excess exhaust gas is discharged from the outlet of the cooling circulation fan 15 to the gas circulation system of the internal heat drying bed 2.
[0036] Compared with the prior art, the utility model has at least the following advantages:
[0037] 1. The internal heating drying bed and the internal heating cooling bed of the utility model adopt independent gas circulation systems. The two circulation systems do not interfere with each other. The hot cycle and the cold cycle are strictly zoned and recycled. The hot cycle uses air as a carrier gas, and the cold cycle uses nitrogen as a carrier gas. The exhaust gas emission is small. Only the internal heating cooling bed consumes nitrogen. The nitrogen consumption is low, which is safer and more environmentally friendly.
[0038] 2. The two-stage fluidized bed series drying and cooling process is adopted, with good adjustability of drying and cooling and controllable product quality.
[0039] 3. The two-stage fluidized bed series drying and cooling system of the utility model fully considers the phenomenon of most powdered high-temperature materials sticking to the materials, and adopts two methods for dehumidification respectively. It has higher operational reliability and can run continuously. It has the advantages of simple operation, high degree of automation, and small exhaust emissions. It can be widely promoted and applied to the deep drying of materials such as resins, nylon, polyethylene, adipic acid, and inorganic salts, and has broad application prospects.
[0040] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. At the same time, for those skilled in the art, according to the ideas of the utility model, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the utility model.
Claims
1. A two-stage fluidized bed series drying and cooling system, characterized in that: include: An internally heated drying bed (2), a drying cyclone dust collector (3), a washing tower (5), an internally heated cooling bed (12), a cooling bag dust collector (13), and a surface cooler (16); The drying cyclone dust collector (3) is connected to the top of the internally heated drying bed (2), the bottom of the washing tower (5) is connected to the top of the drying cyclone dust collector (3), the discharge port of the internally heated drying bed (2) is connected to the internally heated cooling bed (12); the top of the washing tower (5) is connected to the bottom of the internally heated drying bed (2); The top of the internal heating cooling bed (12) is connected to the cooling bag dust collector (13), the surface cooler (16) is connected to the top of the cooling bag dust collector (13), and the surface cooler (16) is also connected to the internal heating cooling bed (12). The carrier gas in the internal heating cooling bed (12) is processed by the cooling bag dust collector (13) and the surface cooler (16) and then returns to the internal heating cooling bed (12) for recycling.
2. The two-stage fluidized bed series drying and cooling system according to claim 1 is characterized in that: The top of the internal heating cooling bed (12) is connected to the discharge port of the internal heating drying bed (2), and the discharge port of the internal heating drying bed (2) is also provided with a drying discharge valve (11).
3. The two-stage fluidized bed series drying and cooling system according to claim 1 is characterized in that: A drying cyclone discharge valve (4) is provided on the pipeline connecting the drying cyclone dust collector (3) and the internally heated drying bed (2); another pipeline is also provided on the top of the drying cyclone dust collector (3) and connected to the top of the internally heated drying bed (2); The top of the internal heating drying bed (2) is provided with a feed inlet, and the feed inlet is connected to the scatterer (1).
4. The two-stage fluidized bed series drying and cooling system according to claim 1, characterized in that: A drying circulation fan (9) and a heater (10) are provided on a pipeline connecting the top of the washing tower (5) and the bottom of the internally heated drying bed (2); the drying circulation fan (9) is also connected to an air filter (8); and the hot carrier gas in the internally heated drying bed (2) passes through the washing tower (5), the drying circulation fan (9) and the heater (10), and then returns to the internally heated drying bed (2) for recycling.
5. The two-stage fluidized bed series drying and cooling system according to claim 1, characterized in that: A washing pump (6) and a cooler (7) are also provided. One end of the washing pump (6) is connected to the bottom of the cooler (7), and the other end of the washing pump (6) is connected to the bottom of the washing tower (5). The top of the cooler (7) is connected to the lower part, the middle part, and the upper part of the washing tower (5). Circulating low-temperature water is input from the lower part of the cooler (7) and then output from the upper part of the cooler (7).
6. The two-stage fluidized bed series drying and cooling system according to claim 1, characterized in that: The heat medium of the internal heating drying bed (2) is 0.7-1.3 MPa steam or electricity; When the heat medium of the internal heating drying bed (2) is steam; a steam coil is provided in the internal heating drying bed (2), and the number of the steam coils is one, two, or more; low-pressure steam is input from one end of the steam coil and output from the other end of the steam coil; the low-pressure steam is used to dry the material in the internal heating drying bed (2).
7. The two-stage fluidized bed series drying and cooling system according to claim 1, characterized in that: The internal heat cooling bed (12) is provided with a cooling water coil or a freezing water coil, the number of the cooling water coil or the freezing water coil is one, two, or more, and circulating cooling water is input into the cooling water coil or the freezing water coil, and the circulating cooling water is used to cool the material in the internal heat cooling bed (12).
8. The two-stage fluidized bed series drying and cooling system according to claim 1, characterized in that: The discharge port of the internal heating cooling bed (12) is provided with a cooling discharge valve (17), and the cooled material is discharged from the discharge port of the internal heating cooling bed (12) and discharged through the cooling discharge valve (17); A cooling bag discharge valve (14) is provided at the bottom of the cooling bag dust collector (13), and the cooling bag discharge valve (14) is connected to the discharge port of the internal heating cooling bed (12), and the dust falling through the cooling bag discharge valve (14) is sent to the discharge box of the internal heating cooling bed (12).
9. The two-stage fluidized bed series drying and cooling system according to claim 1, characterized in that: A cooling circulation fan (15) is provided on the pipeline connecting the cooling bag dust collector (13) and the surface cooler (16); circulating low-temperature water is input from the top of the surface cooler (16) and then output from the bottom of the surface cooler (16); a waste water outlet is also provided at the bottom of the surface cooler (16); and a nitrogen inlet is also provided at the top of the cooling bag dust collector (13).
10. The two-stage fluidized bed series drying and cooling system according to claim 1, characterized in that: The washing tower (5) is a plate tower or a packed tower.