A cooling system for adipic acid fluidized bed
By designing a temperature reduction system in the fluidized bed of adipic acid, high-purity water spraying reduces the steam temperature, the problem of low-pressure steam temperature overtemperature is solved, and the long-term stable operation and extension of the operating time of the fluidized bed is achieved.
Patent Information
- Application Number
- CN202421447459.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-06-24
AI Technical Summary
During the production process of adipic acid, the overtemperature of the low-pressure steam temperature causes the temperature of the heat exchanger in the fluidized bed to be higher than the melting point of the adipic acid, causing the melting and adhesion of the adipic acid, and the fluidized bed is not well fluidized, and even causing the fluidized bed to die.
A temperature reduction system for a fluidized bed of adipic acid is designed. By adding high-purity water spraying method after decompression, the temperature of low-pressure steam is reduced, and the steam temperature entering the fluidized bed is controlled to ensure the stability of the temperature in the fluidized bed.
The steam temperature entering the fluidized bed is effectively controlled, the steam temperature is avoided, the steam temperature is overtempered, the stable operation of the fluidized bed is ensured, the running time of the fluidized bed is extended, and the labor intensity and operation and maintenance costs of the cleaning bed are reduced.
Smart Images
Figure CN222694705U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemical equipment, in particular to a temperature reduction system of an adipic acid fluidized bed. Background Art
[0002] In the adipic acid production process, the adipic acid in the drying section is separated by the third centrifugal separation system. The adipic acid filter cake (water content 8%-12%) flows into the double-shaft mixer through the chute, and is mixed with the adipic acid return material in the return bin conveyed by the screw conveyor in the mixer. The mixed materials are added to the fluidized bed dryer cooler through the feed disperser. The air is preheated by the air preheater, purified by the air filter, pressurized by the blower, heated by the steam heat exchanger, and then enters the bottom wind chamber of the fluidized bed drying section, and then passes through the air distribution plate into the bed layer.
[0003] In this process, the air entering the bed is effectively controlled so that the material in the bed maintains a stable fluidization state, and exchanges heat and dries with the heat exchanger in the bed. When the steam temperature rises, the low-pressure steam temperature entering the fluidized bed for adipic acid drying appears to be over-temperature, with the highest steam temperature reaching 230°C. The low-pressure steam pressure after decompression also exceeds the maximum display value. The steam entering the fluidized bed cannot be reduced by decompression, resulting in the temperature of the heat exchanger coil in the fluidized bed being higher than the melting point of adipic acid, 153°C. The adipic acid entering the fluidized bed is melted and adhered to the heat exchanger coil and the air supply plate at the bottom of the fluidized bed, resulting in a poor fluidization state of the fluidized bed, which is an important reason for the dead bed of the fluidized bed.
[0004] How to control the temperature of steam entering the fluidized bed, ensure the long-term stable operation of the adipic acid unit, increase the operating time of the fluidized bed, and reduce the labor intensity of bed cleaning and operation and maintenance costs are technical problems that need to be solved at present. Utility Model Content
[0005] In order to solve the problems that the low-pressure steam temperature overheats in the existing adipic acid production, resulting in the temperature of the heat exchanger coil in the fluidized bed being higher than the melting point of adipic acid, the adipic acid melts and adheres to the heat exchanger coil and the air supply plate at the bottom of the fluidized bed, thereby causing the fluidization state of the fluidized bed to be poor and leading to the dead bed of the fluidized bed, etc., the utility model provides a cooling system for an adipic acid fluidized bed to achieve the purpose of controlling the temperature of the steam entering the fluidized bed in the adipic acid drying fluidized bed, ensuring the long-term stable operation of the adipic acid device, increasing the operation time of the fluidized bed, and reducing the labor intensity of bed cleaning and the operation and maintenance costs.
[0006] The utility model adopts the following technical scheme to solve the above technical problems: a cooling system for an adipic acid fluidized bed, comprising a fluidized bed, a steam hand valve entering the fluidized bed, a first thermometer, a pressure regulating valve front hand valve, a pressure regulating valve rear hand valve, a regulating valve bypass, a steam cooler, a pure water steam front hand valve entering the steam, a check valve, a regulating valve, a pressure gauge, a second thermometer, a steam cooling pure water main valve, a low-pressure steam main pipeline and a pure water main pipeline, the low-pressure steam main pipeline and the pure water main pipeline are arranged in parallel, the inlet end of the steam hand valve entering the fluidized bed is connected to the low-pressure steam main pipeline, the first thermometer, the pressure regulating valve front hand valve, the pressure regulating valve rear hand valve, the regulating valve bypass, the steam cooler, the pure water Before steam enters, a manual valve, a check valve, a regulating valve, a pressure gauge and a second thermometer are connected to the outlet end of the manual valve for steam entering the fluidized bed. The head end of the steam cooling pure water main valve is connected to the outlet end of the regulating valve. The end of the steam cooling pure water main valve is connected to the pure water main pipeline. The inlet end of the fluidized bed is connected in parallel with the steam desuperheater, the pressure gauge and the second thermometer. Low-pressure steam is arranged in the low-pressure steam main pipeline. The low-pressure steam is measured by the first thermometer, and enters the fluidized bed after being adjusted by each steam control regulating valve group, and the material in the fluidized bed is dehumidified and dried. The amount of pure water added is adjusted by the regulating valve, the second thermometer and the steam cooling pure water main valve to adjust the temperature in the fluidized bed.
[0007] As a further optimization scheme of the cooling system of the above-mentioned adipic acid fluidized bed, the temperature of the low-pressure steam entering the fluidized bed is -°C.
[0008] As a further optimization scheme of the above-mentioned cooling system of the adipic acid fluidized bed, the pressure of the low-pressure steam entering the fluidized bed is controlled by a regulating valve to control the temperature in the fluidized bed.
[0009] As a further optimization scheme of the cooling system of the adipic acid fluidized bed, the regulating valve bypass is arranged in parallel beside the pressure regulating valve front hand valve and the pressure regulating valve rear hand valve.
[0010] Compared with the prior art, the beneficial effects of the utility model are:
[0011] The utility model comprises a fluidized bed, a manual valve for steam entering the fluidized bed, a first thermometer, a manual valve before the pressure regulating valve, a manual valve after the pressure regulating valve, a regulating valve bypass, a steam desuperheater, a manual valve before pure water enters the steam, a check valve, a regulating valve, a pressure gauge, a second thermometer, a steam desuperheating pure water main valve, a low-pressure steam main pipeline and a pure water main pipeline, and a method for controlling the temperature of low-pressure steam entering the fluidized bed heat exchanger: when the temperature of the low-pressure steam after decompression exceeds the control range, the temperature of the low-pressure steam can be reduced by adding a spray of high-purity water after decompression, thereby avoiding the occurrence of such events and achieving long-term stable operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic diagram of the process structure of the utility model;
[0013] Markings in the figure: 1. Manual valve for steam entering the fluidized bed, 2. First thermometer, 3. Manual valve before the pressure regulating valve, 4. Manual valve after the pressure regulating valve, 5. Bypass of regulating valve, 6. Steam desuperheater, 7. Manual valve before pure water enters the steam, 8. Check valve, 9. Regulating valve, 10. Pressure gauge, 11. Second thermometer, 12. Steam desuperheating pure water main valve, 13. Low-pressure steam main pipeline, 14. Pure water main pipeline. DETAILED DESCRIPTION
[0014] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.
[0015] like Figure 1 As shown, a cooling system for an adipic acid fluidized bed includes a steam cooler 6, a hand valve 7 before pure water enters the steam, a check valve 8, a regulating valve 9, a steam cooling pure water main valve 12, a first thermometer 2, a pressure gauge 10, and a second thermometer 11.
[0016] The first thermometer 2 entering the adipic acid drying fluidized bed is controlled at 130-155° C. to ensure the temperature in the fluidized bed is stable and remove the humidity and fluidization state of the adipic acid entering the fluidized bed.
[0017] The steam pressure gauge 10 entering the fluidized bed is controlled by a regulating valve, thereby controlling the temperature of the steam entering the fluidized bed, so that the second thermometer 11 entering the fluidized bed is controlled within a controllable range.
[0018] After entering the fluidized bed, the steam is decompressed and the pressure gauge 10 and the second thermometer 11 are out of the control range. The pure water regulating valve is opened and automatically adjusted according to the temperature indication of the second thermometer 11, so that the temperature of the second thermometer 11 is controlled at 130-155°C.
[0019] When pure water is added to the steam pipeline, the steam pressure gauge 10 will decrease, and its pressure is displayed on the pressure gauge 10 after the pure water and steam are mixed. When the pressure is less than the steam pressure of 0.28MPA, the pure water addition regulating valve 9 is reduced or fully closed to prevent the steam pressure from being too low, which will affect the adipic acid drying effect in the fluidized bed.
[0020] After pure water is added to the steam pipe, the moisture inside the steam pipe increases, the water flow of the fluidized bed heat exchanger steam trap increases, and the fluidized bed temperature decreases. When pure water is added to the pipeline, the bypass of the fluidized bed steam trap should be opened less appropriately to accelerate the discharge of moisture.
[0021] Combined with the attached drawings, the workflow of the utility model is as follows: the fluidized bed cooling device includes a hardware system: a regulating valve 9, two first thermometers 2, and a second thermometer 11; a software system: a pressure gauge, the temperature entering the fluidized bed is controlled at 130-155°C, and the pressure is controlled at 0.26-0.28MPA. When the temperature of the steam entering the fluidized bed exceeds the set temperature, the pure water regulating valve 9 will be adjusted according to the detected second thermometer 11, and the adjustment range is based on the speed of the temperature drop. When the steam pressure entering the fluidized bed exceeds the control range, after detection by the pressure gauge 10, the regulating valve 9 will automatically adjust so that the pressure is always controlled at 0.26-0.28MPA. When pure water is added, the steam pressure will increase or decrease, and the second thermometer 11 will change. When the temperature changes, the pure water that has entered is adjusted as the main adjustment. By adjusting the amount of pure water entering the regulating valve 9, the second thermometer 11 of the steam entering the fluidized bed is controlled.
[0022] In actual operation, pure water is added to the middle of the steam pipeline to form a steam cooler 6 in the same direction as the steam flow. The added pure water should be evenly distributed to avoid uneven contact with the steam, which would prevent the purpose of cooling from being achieved.
[0023] The utility model is cleverly designed, and realizes the purpose of ensuring the long-term stable operation of the adipic acid device by controlling the temperature of the steam entering the fluidized bed in the adipic acid drying fluidized bed, improving the operation time of the fluidized bed, and reducing the labor intensity of bed cleaning and the operation and maintenance costs. It solves the problem of overheating of the low-pressure steam in the existing adipic acid production, which causes the temperature of the heat exchanger coil in the fluidized bed to be higher than the melting point of the adipic acid, and the adipic acid melts and adheres to the heat exchanger coil and the air supply plate at the bottom of the fluidized bed, thereby making the fluidization state of the fluidized bed poor, resulting in the dead bed of the fluidized bed, and the like. Compared with the existing technology, the utility model has a good market prospect and development space.
[0024] The preferred specific implementation modes and embodiments of the utility model are described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above implementation modes and embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the concept of the utility model.
Claims
1. A cooling system for an adipic acid fluidized bed, characterized in that: The invention comprises a fluidized bed, a manual valve (1) for steam entering the fluidized bed, a first thermometer (2), a manual valve before the pressure regulating valve (3), a manual valve after the pressure regulating valve (4), a regulating valve bypass (5), a steam desuperheater (6), a manual valve before pure water enters the steam (7), a check valve (8), a regulating valve (9), a pressure gauge (10), a second thermometer (11), a steam desuperheating pure water main valve (12), a low-pressure steam main pipeline (13) and a pure water main pipeline (14), wherein the low-pressure steam main pipeline (13) and the pure water main pipeline (14) are arranged in parallel, the inlet end of the manual valve (1) for steam entering the fluidized bed is connected to the low-pressure steam main pipeline (13), the first thermometer (2), the manual valve before the pressure regulating valve (3), the manual valve after the pressure regulating valve (4), the regulating valve bypass (5), the steam desuperheater (6), the manual valve before the ... the check valve The reverse valve (8), the regulating valve (9), the pressure gauge (10), and the second thermometer (11) are connected to the outlet end of the steam manual valve (1) entering the fluidized bed; the head end of the steam cooling pure water main valve (12) is connected to the outlet end of the regulating valve (9); the tail end of the steam cooling pure water main valve (12) is connected to the pure water main pipeline (14); the inlet end of the fluidized bed is connected in parallel with the steam cooler (6), the pressure gauge (10), and the second thermometer (11); low-pressure steam is arranged in the low-pressure steam main pipeline (13); the low-pressure steam is measured by the first thermometer (2), and is adjusted by each steam control regulating valve group before entering the fluidized bed, and dehumidifies and dries the material in the fluidized bed; the amount of pure water added is adjusted by the regulating valve (9), the second thermometer (11), and the steam cooling pure water main valve (12) to adjust the temperature in the fluidized bed.
2. The cooling system of a fluidized bed of adipic acid according to claim 1, characterized in that: The temperature of the low-pressure steam entering the fluidized bed is 130-155°C.
3. The cooling system of a fluidized bed of adipic acid according to claim 1, characterized in that: The pressure of the low-pressure steam entering the fluidized bed is controlled by a regulating valve (9) to control the temperature in the fluidized bed.
4. The cooling system of a fluidized bed of adipic acid according to claim 1, characterized in that: The regulating valve bypass (5) is arranged in parallel beside the pressure regulating valve front hand valve (3) and the pressure regulating valve rear hand valve (4).