Device for drying oxalic acid crystals
By setting a cooler and heat recovery heat exchanger in the drying device of oxalic acid crystal, the problem of water consumption and pollutant emissions during the drying process of oxalic acid crystals and the discharge of pollutants is solved. Energy consumption.
Patent Information
- Application Number
- CN202420211329.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-29
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-01-29
AI Technical Summary
During the drying of oxalic acid crystals, a large amount of washing water is needed to consume and pollutant emissions are generated, resulting in increased environmental pollution and wastewater treatment pressure.
By setting the cooler, cool down the hot air after dust removal of the whirlwind separator or cloth bag dust collector. The formed water is collected to the condensed liquid collection tank, and heat recycled the heat recovery heat exchanger to reducing the heat consumption during the drying process.
Avoid the wind after drying the oxalic acid crystal, which needs to be washed, reduced the consumption and treatment of water washing water, while avoiding the discharge of pollutants, protecting the environment, and reducing heat consumption during the drying process.
Smart Images
Figure CN222418211U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of oxalic acid drying, in particular to a device for drying oxalic acid crystals. Background Art
[0002] In the coal-to-ethylene glycol process, the by-product anhydrous oxalic acid produced has a wide range of industrial uses. Oxalic acid crystals need to be dried and heated to 100.1℃ to lose crystal water and form anhydrous oxalic acid. In the drying process, a vibrating fluidized bed dryer is needed to dry the oxalic acid crystals. When the vibrating fluidized bed dryer is working, the fan sends air into the air supply duct, which is heated by the heater on the air supply duct and sent to the lower part of the fluidized bed and blown out along the flushing holes. At the same time, the vibrating fluidized bed vibrates with the vibration motor, and the oxalic acid crystals on the material plate have a throwing and loosening process, move forward and contact with the heated air, so that the oxalic acid crystals are dehydrated in the process of moving forward; the hot air carries water and leaves the vibrating fluidized bed dryer after contacting the oxalic acid crystals. The hot air leaving the vibrating fluidized bed dryer enters the washing tower after dust removal by the cyclone separator or bag dust collector, and is washed by washing water in the washing tower and discharged into the atmosphere. A large amount of washing water is consumed in this process. At the same time, the washing water is sent to the wastewater treatment device, which increases the wastewater treatment capacity. The washed air will inevitably carry trace pollutants and be discharged into the atmosphere, polluting the environment. Utility Model Content
[0003] Based on the problems of the prior art, the utility model provides a device for drying oxalic acid crystals, which does not require washing of hot air after drying, avoids the use of washing water and treatment of washing water, and also has no air discharge after drying, thus protecting the environment.
[0004] In order to solve the above technical problems, the technical solution of the utility model is as follows:
[0005] A device for drying oxalic acid crystals comprises a vibrating fluidized bed dryer and a blower and a heater thereof, wherein the blower outlet is connected to the lower part of the vibrating fluidized bed dryer through an air supply duct, the heater is installed on the air supply duct, the gas outlet at the top of the vibrating fluidized bed dryer is connected to the inlet of a cyclone separator or a bag dust collector through an air duct; the air outlet of the cyclone separator or the air outlet of the bag dust collector is connected to the air inlet of a cooler through an air duct, and the air outlet of the cooler is connected to the inlet of the blower through an air duct; the condensate outlet of the cooler is connected to a condensate collecting tank through a pipeline.
[0006] Furthermore, an induced draft fan is also provided on the air duct of the cyclone separator air outlet or the bag dust collector air outlet.
[0007] Furthermore, the inlet of the blower is also connected to the atmosphere through an air duct, and an air filter is arranged on the air duct connecting the blower and the atmosphere.
[0008] Furthermore, the cooler is also provided with a bypass air duct, and an air control valve is provided on the bypass air duct.
[0009] Furthermore, it also includes a heat recovery heat exchanger, the induced draft fan outlet is connected to the tube-side air inlet of the heat recovery heat exchanger through an air duct, the tube-side air outlet of the heat recovery heat exchanger is connected to the air inlet of the cooler through an air duct, the air outlet of the cooler is connected to the shell-side air inlet of the heat recovery heat exchanger through an air duct, and the shell-side air outlet of the heat recovery heat exchanger is connected to the inlet of the blower through an air duct. Beneficial Effects
[0010] 1. The utility model cools down the hot air after dust removal by the cyclone separator or bag dust collector by setting a cooler, and the cooled air is sent into the vibrating fluidized bed dryer by the blower to dry the oxalic acid crystals, so that the air circulates to dry the oxalic acid crystals, and the water condensed by the cooler is collected in the condensate collection tank; the utility model does not need to wash the air after the oxalic acid crystals are dried, thus avoiding the consumption of washing water and the treatment of washing water. The utility model also does not discharge the air after the oxalic acid crystals are dried, thus protecting the environment.
[0011] 2. The utility model recovers the heat carried by the hot air after dust removal by the cyclone separator or bag filter by setting a heat recovery heat exchanger, thereby reducing the heat consumption in the drying process of oxalic acid crystals. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;
[0013] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present utility model;
[0014] 1-blower; 2-heater; 3-vibrating fluidized bed dryer; 4-cyclone separator; 5-bag dust collector; 6-induced draft fan; 7-cooler; 8-wind control valve; 9-air filter; 10-heat recovery heat exchanger. DETAILED DESCRIPTION Example 1
[0015] Reference Figure 1, in order to avoid the consumption of washing water and the treatment of washing water during the drying process of oxalic acid crystals, and at the same time avoid the air after washing from carrying trace pollutants to be discharged into the atmosphere to pollute the environment; the utility model provides a device for drying oxalic acid crystals, including a vibrating fluidized bed dryer 3 and its blower 1, and a heater 2, the inlet of the blower 1 is connected to the atmosphere through an air duct, an air filter 9 is arranged on the air duct connecting the blower 1 with the atmosphere, the outlet of the blower 1 is connected to the lower part of the vibrating fluidized bed dryer 3 through an air supply pipeline, and the heater 2 is installed on the air supply pipeline; the gas outlet at the top of the vibrating fluidized bed dryer 3 is connected to the inlet of the cyclone separator 4 through the air duct; the air outlet of the cyclone separator 4 is connected to the air inlet of the cooler 7 through the air duct, and the air duct of the air outlet of the cyclone separator 4 is also provided with an induced draft fan 6; the air outlet of the cooler 7 is connected to the inlet of the blower 1 through the air duct; the condensate outlet of the cooler 7 is connected to the condensate collection tank through a pipeline; the cooler 7 is also provided with a bypass air duct, and a wind control valve 8 is arranged on the bypass air duct. Example 2
[0016] Reference Figure 2 , in order to avoid the consumption of washing water and the treatment of washing water during the drying process of oxalic acid crystals, and at the same time avoid the air after washing from carrying trace pollutants and being discharged into the atmosphere to pollute the environment; the utility model provides a device for drying oxalic acid crystals, including a vibrating fluidized bed dryer 3 and its air supply fan 1, a heater 2, and a heat recovery heat exchanger 10, the inlet of the air supply fan 1 is connected to the atmosphere through an air duct, an air filter 9 is arranged on the air duct connecting the air supply fan 1 and the atmosphere, the outlet of the air supply fan 1 is connected to the lower part of the vibrating fluidized bed dryer 3 through an air supply duct, and the heater 2 is installed on the air supply duct; the gas outlet at the top of the vibrating fluidized bed dryer 3 is connected to the inlet of the bag dust collector 5 through an air duct The air outlet of the bag-type dust collector 5 is connected to the air inlet of the tube side of the heat recovery heat exchanger 10 through an air duct, the air outlet of the tube side of the heat recovery heat exchanger 10 is connected to the air inlet of the cooler 7 through an air duct, the air outlet of the cooler 7 is connected to the shell side air inlet of the heat recovery heat exchanger 10 through an air duct, and the shell side air outlet of the heat recovery heat exchanger 10 is connected to the inlet of the blower 1 through an air duct; an induced draft fan 6 is also arranged on the air duct of the air outlet of the bag-type dust collector 5; the condensate outlet of the heat recovery heat exchanger 10 and the condensate outlet of the cooler 7 are connected to the condensate collecting tank through a pipeline; the cooler 7 is also provided with a bypass air duct, and a wind control valve 8 is arranged on the bypass air duct.
[0017] The working principle of the utility model is: by setting a cooler 7, the hot air after dust removal by the cyclone separator 4 or the bag dust collector 5 is cooled and cooled, and the cooled air is sent into the vibrating fluidized bed dryer 3 by the air blower 1 again to dry the oxalic acid crystals, so that the wind circulates and dries the oxalic acid crystals, and the water condensed by the cooler 7 is collected in the condensate collection tank; the utility model does not need to wash the wind after the oxalic acid crystals are dried, thus avoiding the consumption of washing water and also avoiding the treatment of washing water. The utility model also does not discharge the wind after the oxalic acid crystals are dried, thus avoiding the pollution of the environment by the trace pollutants carried by the external exhaust wind. At the same time, the utility model also recovers the heat carried by the hot air after dust removal by the cyclone separator 4 or the bag dust collector 5 by setting a heat recovery heat exchanger 10, thereby reducing the heat consumption in the drying process of the oxalic acid crystals.
[0018] Modifications and changes to the invention made by those familiar with the present invention are all within the patent scope of the present invention, and are not limited to those described in the embodiments.
Claims
1. A device for drying oxalic acid crystals, comprising a vibrating fluidized bed dryer and a blower and a heater, wherein the blower outlet is connected to the lower part of the vibrating fluidized bed dryer through an air supply duct, the heater is installed on the air supply duct, and the gas outlet at the top of the vibrating fluidized bed dryer is connected to the inlet of a cyclone separator or a bag filter through an air duct; characterized in that: The air outlet of the cyclone separator or the bag dust collector is connected to the air inlet of the cooler through an air duct, and the air outlet of the cooler is connected to the inlet of the blower through the air duct; the condensate outlet of the cooler is connected to the condensate collection tank through a pipeline.
2. The device for drying oxalic acid crystals according to claim 1, characterized in that: An induced draft fan is also arranged on the air duct of the cyclone separator air outlet or the bag dust collector air outlet.
3. The device for drying oxalic acid crystals according to claim 1, characterized in that: The inlet of the blower is also connected to the atmosphere through an air duct, and an air filter is arranged on the air duct connecting the blower and the atmosphere.
4. The device for drying oxalic acid crystals according to claim 1, characterized in that: The cooler is also provided with a bypass air duct, and an air control valve is provided on the bypass air duct.
5. The device for drying oxalic acid crystals according to claim 2, characterized in that: It also includes a heat recovery heat exchanger, the outlet of the induced draft fan is connected to the tube-side air inlet of the heat recovery heat exchanger through an air duct, the tube-side air outlet of the heat recovery heat exchanger is connected to the air inlet of the cooler through an air duct, the air outlet of the cooler is connected to the shell-side air inlet of the heat recovery heat exchanger through an air duct, and the shell-side air outlet of the heat recovery heat exchanger is connected to the inlet of the blower through an air duct.