CN214892178U - Drying system of adipic acid fluidized bed device - Google Patents
Drying system of adipic acid fluidized bed device Download PDFInfo
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- CN214892178U CN214892178U CN202121305071.4U CN202121305071U CN214892178U CN 214892178 U CN214892178 U CN 214892178U CN 202121305071 U CN202121305071 U CN 202121305071U CN 214892178 U CN214892178 U CN 214892178U
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- adipic acid
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- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 title claims abstract description 390
- 235000011037 adipic acid Nutrition 0.000 title claims abstract description 196
- 239000001361 adipic acid Substances 0.000 title claims abstract description 195
- 238000001035 drying Methods 0.000 title claims abstract description 135
- 238000001816 cooling Methods 0.000 claims abstract description 128
- 239000000428 dust Substances 0.000 claims abstract description 114
- 239000000463 material Substances 0.000 claims abstract description 86
- 239000000843 powder Substances 0.000 claims abstract description 35
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- 229920000742 Cotton Polymers 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
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- QGBPKJFJAVDUNC-UHFFFAOYSA-N methyl 4-methoxy-3-oxobutanoate Chemical compound COCC(=O)CC(=O)OC QGBPKJFJAVDUNC-UHFFFAOYSA-N 0.000 description 1
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- Drying Of Solid Materials (AREA)
Abstract
The utility model relates to the field of drying systems, in particular to a drying system of an adipic acid fluidized bed device, which comprises an adipic acid mixed feeding system, a drying air inlet system, a cooling air inlet system, a fluidized bed device and a dust removal system; the adipic acid mixing and feeding system is used for receiving wet adipic acid from the outside and dry adipic acid powder recovered by the dust removal system, the tail end of the adipic acid mixing and feeding system is connected with the fluidized bed device, the drying air inlet system and the cooling air inlet system are sequentially connected with the inside of the fluidized bed device, and the dust removal system is used for realizing the treatment and recovery of adipic acid dust discharged from the fluidized bed device; the dry materials required by the adipic acid mixer are a part of dry powders captured by the cyclone dust collector, and conveying equipment is not required to be added; in addition, the temperature of the part of dry adipic acid is close to the temperature of the material in the drying section of the fluidized bed device, and the cold load and the heat load of the fluidized bed device cannot be increased after the part of dry adipic acid enters the bed of the fluidized bed device.
Description
Technical Field
The utility model belongs to the technical field of drying system and specifically relates to adipic acid fluidized bed device drying system.
Background
Adipic acid belongs to aliphatic carboxylic acid, is commonly called as adipic acid, has a molecular formula of C6H10O4, is loose crystals with wide particle size distribution, has the characteristics of corrosion, flammability, explosiveness, easy generation of static electricity, easy softening, agglomeration and deterioration due to overhigh temperature, and has a melting point of 153 ℃, a boiling point of 337.5 ℃ and an explosion limit of 7.9% (upper limit)/3.94% (lower limit).
The product is mainly used for manufacturing the cotton fiber 66 and polyurethane resin, and then is used for manufacturing the plasticizer and the lubricating grease, is used as an acid increasing agent for food in a small amount and is used for replacing tartaric acid to be used for baking powder, can also be used for manufacturing pesticides and adhesives, and the adipic acid is also used for producing medicines, spices and the like.
At present, the industries with fast increase of the usage amount in China include the resin industry for synthetic leather, the polyurethane sole resin industry, the polyurethane adhesive and the TPU polyol industry.
The traditional drying method in the adipic acid production process mainly comprises the following methods:
the first method comprises the following steps: a vibrated fluidized bed apparatus. Because the bed of material is shallow (generally at 20 ~ 50mm) in the vibrated fluidized bed device desiccator, hot-blast process bed of material time is short, and the heat transfer degree is not enough, consequently when the material need carry out deep drying, just must improve the exhaust temperature of tail gas, and the system heat loss is big.
Because the operation gas speed of the vibrated fluidized bed device is low, under the condition that the heat supply quantity and the air supply quantity are not changed, the drier of the vibrated fluidized bed device needs a bed layer area which is much larger than that of the common fluidized bed device.
In addition, the vibrating fluidized bed device is a vibrating device, so the service life of the device is short, a plurality of wearing parts are provided, and the failure rate is high.
And the second method comprises the following steps: an air flow dryer. Because the pneumatic drier operates at a fast gas speed (generally 20m/s), the drying time is short, and the temperature of tail gas of the material must be increased when the material needs to be deeply dried.
Because the materials are violently collided and abraded in the operation process of the airflow dryer, the breakage rate of the material particles is high, and static electricity is easy to generate.
And the third is that: a conventional fluidized bed apparatus. Adipic acid drying is generally carried out using a fluidized bed apparatus.
Although the common fluidized bed device has the advantages of high thermal efficiency, no wearing parts and the like compared with a vibrating fluidized bed device dryer and an airflow dryer.
However, the wet adipic acid is mixed with dry adipic acid powder before entering the fluidized bed device, and the part of the dry adipic acid is a product dried/cooled by the fluidized bed device and is returned by the conveying device. The conveying equipment is required to be added separately.
In addition, the returned adipic acid is cooled, and the material enters the fluidized bed device again for heating and cooling, so that the heat load and the cold load of the fluidized bed device are increased
The fast material generated in the drying process of the adipic acid in the fluidized bed device can not be discharged in time, so that the fluidization of the fluidized bed device is weakened.
The temperature of the product is higher (40-60 ℃) after the adipic acid is dried and cooled by the fluidized bed device, the product has poor fluidity and is easy to harden after being stored for a period of time.
To sum up, the utility model discloses not enough of traditional fluidized bed device drying technology of adipic acid especially provides a new adipic acid fluidized bed device drying system.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve one of above-mentioned technical problem, the technical scheme who adopts is: the adipic acid fluidized bed device drying system comprises an adipic acid mixed feeding system, a drying air inlet system, a cooling air inlet system, a fluidized bed device and a dust removal system;
the adipic acid mixing and feeding system is used for receiving wet adipic acid from the outside and dry adipic acid powder recovered by the dust removal system, the tail end of the adipic acid mixing and feeding system is connected with the fluidized bed device, the drying air inlet system and the cooling air inlet system are sequentially connected with the inside of the fluidized bed device, and the dust removal system is used for realizing the treatment and recovery of adipic acid dust discharged from the fluidized bed device.
In any of the above schemes, preferably, the adipic acid mixing and feeding system includes a mixer, two feed inlets on the mixer are respectively connected with an external centrifuge and a material discharge port of the dust removal system, and a discharge port below the mixer is connected with the feed inlet of the fluidized bed body and corresponds to the position of the drying section.
In any of the above schemes, preferably, a breaker is installed on a pipeline between the discharge port below the mixer and the feed inlet of the fluidized bed body, and the breaker is used for fully breaking up the mixed powder.
In any one of the above embodiments, it is preferable that the fluidized bed apparatus includes a fluidized bed body, the fluidized bed body is divided into a drying section and a cooling section inside the fluidized bed body, and the drying section and the cooling section are separated by a partition.
In any of the above embodiments, preferably, a plurality of built-in heaters are provided inside the drying section of the fluidized bed body.
In any of the above schemes, preferably, the inlet of each internal heater is respectively communicated with the steam inlet pipe, and the outlet of each internal heater is respectively communicated with the steam condensate water outlet pipe; the steam inlet pipe is used for introducing external steam into the built-in heater; the steam condensate water outflow pipe is used for discharging condensate water in each built-in heater to the outside.
In any of the above schemes, preferably, the drying air inlet system includes a drying air filter, a drying blower and a drying heat exchanger which are sequentially connected through a pipeline from the outside to the inside, and an outlet end of the drying air inlet system is connected with the inside of the drying section of the fluidized bed body.
In the process, air entering the fluidized bed after passing through the drying air inlet system can be effectively controlled, so that materials in the fluidized bed can maintain a stable fluidized state, and the materials and all built-in heaters in the fluidized bed dry adipic acid together.
And (4) feeding the dried qualified material into a cooling section of the fluidized bed body.
In any of the above schemes, preferably, the cooling air inlet system includes a cooling air filter, a dehumidifier, and a cooling blower sequentially connected through a pipeline from the outside to the inside, and an outlet end of the cooling air inlet system is connected to the inside of the cooling section of the fluidized bed body.
The cooling air is purified by a cooling air filter in sequence, dehumidified and cooled by a dehumidifier, pressurized by a cooling blower and then flows into a cooling section of the fluidized bed body.
The cooling air introduced by the cooling air inlet system can maintain the stable fluidization state of the materials in the fluidized bed and cools the adipic acid together with each built-in cooler in the fluidized bed.
And discharging the qualified product through a finished product discharge port on the fluidized bed body, namely discharging the blocky materials generated in the drying and cooling processes of the adipic acid from a bottom material discharge port of the fluidized bed body.
In any of the above schemes, preferably, the dust removal system comprises a cyclone dust collector, a washing tower and a system induced draft fan which are sequentially connected through a pipeline from upstream to downstream, and the dust removal system is used for receiving the dust-containing gas discharged from the top of the fluidized bed body.
The lower part of the cyclone dust collector is provided with a three-way material distributing valve which can control the amount of the dry adipic acid returned to the mixer.
The method comprises the following steps that dusty gas discharged from the top of a fluidized bed body enters a cyclone dust collector of a dust removal system, the dusty gas is firstly subjected to primary dust removal through the cyclone dust collector, dry adipic acid powder is collected by the cyclone dust collector, a part of dry adipic acid enters a corresponding feed inlet of a mixer through a discharge valve of the cyclone dust collector and a three-way material distribution valve and then is mixed with wet adipic acid, the temperature of the part of dry adipic acid is close to that of materials in a drying section of the fluidized bed body, and the cold and heat loads of the fluidized bed cannot be increased after the part of dry adipic acid enters the fluidized bed body; the other part of the dry adipic acid powder enters a cooling section of the fluidized bed body, is cooled and then is discharged.
The distance between the lower edge of the built-in heater, the built-in cooler and the partition plate of the fluidized bed body is 200-300 mm, and enough channels are reserved for discharging blocky materials in the drying and cooling fluidized bed, so that the smoothness of material discharge can be ensured, and the fluidized bed is prevented from being weakened due to the fact that the fast materials cannot be discharged in time.
Compared with a common fluidized bed, the system does not need to cool the dry adipic acid required by mixing materials, and can better ensure the cooling depth of the adipic acid.
The cooling air inlet system is provided with a dehumidifier, so that the humidity and the temperature of cooling air can be controlled, the cooling depth is ensured, and the moisture regain phenomenon caused by the contact of dry adipic acid with wet air is also prevented.
And then the dust is removed by the washing tower for the second time and then is emptied by a system induced draft fan.
The built-in heater is not arranged in the feeding area of the adipic acid, so that the adipic acid is prevented from caking.
In any of the above embodiments, preferably, a plurality of internal coolers are provided inside the cooling section of the fluidized bed body.
In any of the above schemes, preferably, an inlet of each built-in cooler is respectively communicated with a circulating water inlet pipe, and an outlet of each built-in cooler is respectively communicated with a circulating water return pipe; the circulating water inlet pipe is used for introducing external circulating water into the built-in heater; the circulating water return pipe is used for discharging circulating water in each built-in cooler.
In any of the above aspects, it is preferable that the lower edge of the partition plate is not lower than the lower edges of the respective built-in heaters and the respective built-in coolers.
In any of the above schemes, preferably, the size of a space between the lower edge of the built-in heater and/or the built-in cooler and the air distribution plate inside the fluidized bed body is 200-300 mm, and the space is a reserved discharge channel for the bulk material inside the fluidized bed body.
Avoid the fluidized bed to be weakened because the fast material can not be got rid of in time.
In any of the above schemes, preferably, a bed charge discharge port and a finished product discharge port are arranged at the downstream of the fluidized bed body, the large materials are discharged out of the fluidized bed body through the bottom discharge port, and the finished product discharge port is composed of an upper overflow port and a lower discharge valve.
In any of the above schemes, preferably, the lower part of the drying section of the fluidized bed body is connected with the drying air inlet system through a plurality of air inlets, and the lower part of the cooling section of the fluidized bed body is connected with the cooling air inlet system through a plurality of air inlets.
In any of the above schemes, preferably, the cooling air inlet system is provided with a dehumidifier for controlling the humidity and temperature of the cooling air, so that the moisture regain phenomenon caused by the contact of the dry adipic acid with the wet air is prevented while the cooling depth is ensured.
In any of the above schemes, preferably, the upper part of the fluidized bed body is provided with a feed inlet and an exhaust outlet, the feed inlet is connected with the adipic acid mixed feed system, and the exhaust outlet is connected with the dust removal system.
The utility model also provides an utilize adipic acid fluidized bed device drying system to carry out the method that the adipic acid was handled, including following step:
s1: mixing wet adipic acid and dry adipic acid powder to form mixed powder;
s2: feeding the mixed powder into a fluidized bed of a drying system of an adipic acid fluidized bed device;
s3: the mixed powder is fluidized by drying and cooling in a fluidized bed;
s4: after the fluidization treatment, the fluidized bed respectively discharges the finished product of the blocky materials and the dust-containing gas;
s5: carrying out primary dust removal separation on the discharged dust-containing gas to obtain primary dust-removing gas and dry adipic acid powder;
s6: carrying out secondary dust removal on the primary dust removal gas;
s7: part of the obtained dry adipic acid powder is recycled to the step S1 to be mixed with wet adipic acid, and the rest is recycled to the step S3 to be cooled and then discharged with finished block materials.
In any of the above schemes, the weight part ratio of the dry adipic acid powder to the wet adipic acid in the S1 is preferably 1: 2.
In any of the above embodiments, the adipic acid fluidized bed drying system in S1 is preferably the adipic acid fluidized bed drying system described above.
In any of the above schemes, preferably, a material scattering step is further provided before the mixed powder enters the fluidized bed.
The utility model has the advantages as follows:
1) the dry materials required by the adipic acid mixer are a part of dry powders captured by the cyclone dust collector, and conveying equipment is not required to be added; in addition, the temperature of the part of dry adipic acid is close to the temperature of the material at the drying section of the fluidized bed device, and the cold load and the heat load of the fluidized bed device cannot be increased after the part of dry adipic acid enters the bed of the fluidized bed device;
the dry adipic acid required for mixing in the common fluidized bed device is a finished product material cooled by the fluidized bed device, the material enters the fluidized bed device at a lower temperature, and then is heated and heated in a drying section and cooled in a cooling section, so that the heat load and the cold load of the fluidized bed device are increased.
2) The distance between the lower edge of the built-in heater/cooler and the lower edge of the partition plate and the air distribution plate is 200-300 mm, enough channels are reserved for discharging blocky materials in the fluidized bed device, and the phenomenon that fluidization of the fluidized bed device is weakened due to the fact that the fast materials cannot be discharged in time is avoided.
3) The utility model discloses compare with ordinary fluidized bed device and need not cool off the required dry adipic acid of compounding, more can ensure the cooling depth of adipic acid.
4) The cooling air inlet system is provided with a dehumidifier for controlling the humidity and the temperature of cooling air, so that the moisture regain phenomenon caused by the contact of dry adipic acid with wet air is prevented while the cooling depth is ensured.
5) And a built-in heater is not arranged in the adipic acid feeding area, so that the adipic acid can be effectively prevented from caking.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or components are generally identified by like reference numerals. In the drawings, elements or components are not necessarily drawn to scale.
Fig. 1 is a process flow diagram of the system according to embodiment 1 of the present invention.
Fig. 2 is a process flow diagram of the system according to embodiment 2 of the present invention.
In the figure, 1, an adipic acid mixed feeding system; 101. a mixer; 102. a breaker; 2. a drying air inlet system; 201. A dry air filter; 202. a drying blower; 203. drying the heat exchanger; 3. cooling the air inlet system; 301. a cooling air filter; 302. a dehumidifier; 303. a cooling blower; 4. a fluidized bed apparatus; 401. a fluidized bed body; 402. Discharging a finished product; 403. a bottom material discharge hole; 404. a built-in heater; 405. a built-in cooler; 406. a drying section; 407. a cooling section; 408. a partition plate; 5. a dust removal system; 501. a cyclone dust collector; 502. a cyclone dust collector discharge valve; 503. a three-way material distributing valve; 504. a washing tower; 505. a water circulating pump; 506. a system induced draft fan; 6. opening a valve by filtering control; 7. a flow rate control pump.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
Example 1:
as shown in fig. 1, the adipic acid fluidized bed device 4 is a drying system, and comprises an adipic acid mixed feeding system 1, a drying air inlet system 2, a cooling air inlet system 3, a fluidized bed device 4 and a dust removal system 5;
the adipic acid mixing and feeding system 1 is used for receiving wet adipic acid from the outside and dry adipic acid powder recovered by the dust removal system 5, the tail end of the adipic acid mixing and feeding system 1 is connected with the fluidized bed device 4, the drying air inlet system 2 and the cooling air inlet system 3 are sequentially connected with the inside of the fluidized bed device 4, and the dust removal system 5 is used for realizing the treatment and recovery of adipic acid dust discharged from the fluidized bed device 4.
In any of the above solutions, it is preferable that the adipic acid mixing and feeding system 1 includes a mixer 101, two inlets of the mixer 101 are respectively connected to an external centrifuge and a material discharge port of the dust removing system 5, and a discharge port below the mixer 101 is connected to an inlet of the fluidized bed body 401 and corresponds to a position of the drying section 406.
In any of the above embodiments, it is preferable that a breaker 102 is installed on a pipeline between the discharge port below the mixer 101 and the feed port of the fluidized bed body 401, and the breaker 102 is used for sufficiently breaking the mixed powder.
In any of the above embodiments, it is preferable that the fluidized bed apparatus 4 includes a fluidized bed body 401, the fluidized bed body 401 is divided into a drying section 406 and a cooling section 407, and the drying section 406 and the cooling section 407 are separated by a partition 408.
In any of the above solutions, it is preferable that a plurality of built-in heaters 404 are provided inside the drying section 406 of the fluidized bed body 401.
In any of the above schemes, preferably, an inlet of each internal heater 404 is respectively communicated with a steam inlet pipe, and an outlet of each internal heater 404 is respectively communicated with a steam condensate water outlet pipe; the steam inlet pipe is used for introducing external steam into the built-in heater 404; the steam condensate outflow pipe is used for discharging the condensate inside each of the built-in heaters 404 to the outside.
In any of the above schemes, preferably, the drying air inlet system 2 includes a drying air filter 201, a drying blower 202, and a drying heat exchanger 203, which are sequentially connected through a pipeline from the outside to the inside, and an outlet end of the drying air inlet system 2 is connected to the inside of the drying section 406 of the fluidized bed body 401.
In the process, the air entering the fluidized bed after passing through the drying air inlet system 2 can be effectively controlled, so that the materials in the fluidized bed can maintain a stable fluidized state and dry adipic acid together with each built-in heater 404 in the fluidized bed.
The dried qualified material enters the cooling section 407 of the fluidized bed body 401.
In any of the above schemes, preferably, the cooling air inlet system 3 includes a cooling air filter 301, a dehumidifier 302, and a cooling blower 303 sequentially connected through a pipeline from the outside to the inside, and an outlet end of the cooling air inlet system 3 is connected to the inside of the cooling section 407 of the fluidized bed body 401.
The cooling air is purified by the cooling air filter 301, dehumidified and cooled by the dehumidifier 302, pressurized by the cooling blower 303, and then enters the cooling section 407 of the fluidized bed body 401.
The cooling air introduced by the cooling air inlet system 3 can maintain the stable fluidization state of the materials in the fluidized bed, and cools the adipic acid together with each built-in cooler 405 in the fluidized bed.
And discharging the qualified product through a finished product discharge port 402 on the fluidized bed body 401, namely discharging the blocky material generated in the drying and cooling processes of the adipic acid from a bottom material discharge port 403 of the fluidized bed body 401.
In any of the above schemes, preferably, the dust removal system 5 includes a cyclone dust collector 501, a washing tower 504, and a system induced draft fan 506 connected in sequence from upstream to downstream through a pipeline, and the dust removal system 5 is configured to receive the dust-containing gas discharged from the top of the fluidized bed body 401.
The lower part of the cyclone 501 is provided with a three-way material separating valve 503 which can control the amount of the dry adipic acid returned to the mixer 101.
The dust-containing gas discharged from the top of the fluidized bed body 401 enters a cyclone dust collector 501 of the dust removal system 5, the dust-containing gas firstly passes through the cyclone dust collector 501 for primary dust removal, dry adipic acid powder is collected by the cyclone dust collector 501, a part of dry adipic acid enters a corresponding feed inlet of the mixer 101 through a cyclone dust collector discharge valve 502 and a three-way material distribution valve 503 and then is mixed with wet adipic acid, the temperature of the part of dry adipic acid is close to that of the material in a drying section 406 of the fluidized bed body 401, and the cold and heat loads of the fluidized bed cannot be increased after the part of dry adipic acid enters the fluidized bed body 401; the other part of the dry adipic acid powder enters the cooling section 407 of the fluidized bed body 401, is cooled and then is discharged.
The built-in heater 404, built-in cooler 405 and the baffle 408 that the fluidized bed body 401 set up are followed down and are kept for 200 ~ 300mm apart from the grid plate, remain sufficient passageway for cubic material discharge in drying, the cooling fluidized bed to can guarantee material exhaust smoothness nature, avoid leading to the fact the fluidized bed to fluidize the weak because of expediting the unable timely getting rid of.
Compared with a common fluidized bed, the system does not need to cool the dry adipic acid required by mixing materials, and can better ensure the cooling depth of the adipic acid.
The cooling air inlet system 3 is provided with a dehumidifier 302 which can control the humidity and temperature of cooling air, ensure the cooling depth and prevent the moisture regain phenomenon caused by the contact of dry adipic acid with wet air.
And then is exhausted by a system induced draft fan 506 after secondary dust removal by a washing tower 504.
The absence of the built-in heater 404 in the feeding area of the adipic acid prevents the adipic acid from caking.
In any of the above embodiments, preferably, a plurality of internal coolers 405 are provided inside the cooling section 407 of the fluidized bed body 401.
In any of the above schemes, preferably, an inlet of each built-in cooler 405 is respectively communicated with a circulating water inlet pipe, and an outlet of each built-in cooler 405 is respectively communicated with a circulating water return pipe; the circulating water inlet pipe is used for introducing external circulating water into the built-in heater 404; the circulating water return pipe is used for discharging circulating water inside each of the built-in coolers 405.
In any of the above embodiments, it is preferable that the lower edge of the partition 408 is not lower than the lower edges of the respective built-in heaters 404 and the respective built-in coolers 405.
In any of the above schemes, preferably, the size of a space between the lower edge of the internal heater 404 and/or the internal cooler 405 and the air distribution plate inside the fluidized bed body 401 is 200-300 mm, and the space is a reserved discharge channel for the bulk material inside the fluidized bed body 401.
Avoid the fluidized bed to be weakened because the fast material can not be got rid of in time.
In any of the above schemes, preferably, a bed charge outlet 403 and a finished product outlet 402 are arranged at the downstream of the fluidized bed body 401, the bulk material is discharged out of the fluidized bed body 401 through the bottom outlet, and the finished product outlet 402 is composed of an upper overflow port and a lower discharge valve.
In any of the above schemes, preferably, the lower part of the drying section 406 of the fluidized bed body 401 is connected to the drying air inlet system 2 through a plurality of air inlets, and the lower part of the cooling section 407 of the fluidized bed body 401 is connected to the cooling air inlet system 3 through a plurality of air inlets.
In any of the above schemes, it is preferable that the cooling air intake system 3 is provided with a dehumidifier 302, which controls the humidity and temperature of the cooling air, and prevents the moisture regain phenomenon caused by the contact of the dry adipic acid with the wet air while ensuring the cooling depth.
In any of the above schemes, preferably, the upper part of the fluidized bed body 401 is provided with a feed inlet and an exhaust outlet, the feed inlet is connected with the adipic acid mixed feed system 1, and the exhaust outlet is connected with the dust removal system 5.
The utility model also provides an utilize adipic acid fluidized bed device drying system to carry out the method that the adipic acid was handled, including following step:
s1: mixing wet adipic acid and dry adipic acid powder to form mixed powder;
s2: feeding the mixed powder into a fluidized bed body 401 of a drying system of an adipic acid fluidized bed device 4;
s3: the mixed powder is fluidized by drying and cooling in a fluidized bed;
s4: after the fluidization treatment, the fluidized bed respectively discharges the finished product of the blocky materials and the dust-containing gas;
s5: carrying out primary dust removal separation on the discharged dust-containing gas to obtain primary dust-removing gas and dry adipic acid powder;
s6: carrying out secondary dust removal on the primary dust removal gas;
s7: part of the obtained dry adipic acid powder is recycled to the step S1 to be mixed with wet adipic acid, and the rest is recycled to the step S3 to be cooled and then discharged with finished block materials.
In any of the above schemes, the weight part ratio of the dry adipic acid powder to the wet adipic acid in the S1 is preferably 1: 2.
In any of the above embodiments, the drying system of the adipic acid fluidized bed apparatus 4 in S1 is preferably the drying system of the adipic acid fluidized bed apparatus 4 described above.
In any of the above schemes, preferably, a material scattering step is further provided before the mixed powder enters the fluidized bed.
The working process is as follows:
the external wet adipic acid is discharged from the centrifuge and enters the mixer 101, and is mixed with a part of dry adipic acid powder (dry adipic acid powder: wet adipic acid ═ 1:2) collected from the cyclone 501 in the dust removing system 5 in the mixer 101, and the mixed material enters the drying section 406 of the fluidized bed body 401 through the disperser 102.
In the drying in the fluidized bed drying section 406, the drying air is sequentially purified by the drying air filter 201, the drying blower 202 is pressurized, and the drying air is heated by the drying heat exchanger 203 and then flows into the fluidized bed drying section 406.
In the process, the air entering the fluidized bed after passing through the drying air inlet system 2 can be effectively controlled, so that the materials in the fluidized bed can maintain a stable fluidized state and dry adipic acid together with each built-in heater 404 in the fluidized bed.
The dust-containing gas discharged from the top of the fluidized bed body 401 enters a cyclone dust collector 501 of the dust removal system 5, the dust-containing gas firstly passes through the cyclone dust collector 501 for primary dust removal, dry adipic acid powder is collected by the cyclone dust collector 501, a part of dry adipic acid enters a corresponding feed inlet of the mixer 101 through a cyclone dust collector discharge valve 502 and a three-way material distribution valve 503 and then is mixed with wet adipic acid, the temperature of the part of dry adipic acid is close to that of the material in a drying section 406 of the fluidized bed body 401, and the cold and heat loads of the fluidized bed cannot be increased after the part of dry adipic acid enters the fluidized bed body 401; the other part of the dry adipic acid powder enters the cooling section 407 of the fluidized bed body 401, is cooled and then is discharged.
The built-in heater 404, built-in cooler 405 and the baffle 408 that the fluidized bed body 401 set up are followed down and are kept for 200 ~ 300mm apart from the grid plate, remain sufficient passageway for cubic material discharge in drying, the cooling fluidized bed to can guarantee material exhaust smoothness nature, avoid leading to the fact the fluidized bed to fluidize the weak because of expediting the unable timely getting rid of.
Compared with a common fluidized bed, the system does not need to cool the dry adipic acid required by mixing materials, and can better ensure the cooling depth of the adipic acid.
The cooling air inlet system 3 is provided with a dehumidifier 302 which can control the humidity and temperature of cooling air, ensure the cooling depth and prevent the moisture regain phenomenon caused by the contact of dry adipic acid with wet air.
And then is exhausted by a system induced draft fan 506 after secondary dust removal by a washing tower 504.
The absence of the built-in heater 404 in the feeding area of the adipic acid prevents the adipic acid from caking.
Example 2:
as shown in fig. 2, the adipic acid fluidized bed device 4 is a drying system, and includes an adipic acid mixing and feeding system 1, a drying air inlet system 2, a cooling air inlet system 3, a fluidized bed device 4, and a dust removal system 5;
the adipic acid mixing and feeding system 1 is used for receiving wet adipic acid from the outside and dry adipic acid powder recovered by the dust removal system 5, the tail end of the adipic acid mixing and feeding system 1 is connected with the fluidized bed device 4, the drying air inlet system 2 and the cooling air inlet system 3 are sequentially connected with the inside of the fluidized bed device 4, and the dust removal system 5 is used for realizing the treatment and recovery of adipic acid dust discharged from the fluidized bed device 4.
In any of the above solutions, it is preferable that the adipic acid mixing and feeding system 1 includes a mixer 101, two inlets of the mixer 101 are respectively connected to an external centrifuge and a material discharge port of the dust removing system 5, and a discharge port below the mixer 101 is connected to an inlet of the fluidized bed body 401 and corresponds to a position of the drying section 406.
In any of the above embodiments, it is preferable that a breaker 102 is installed on a pipeline between the discharge port below the mixer 101 and the feed port of the fluidized bed body 401, and the breaker 102 is used for sufficiently breaking the mixed powder.
In any of the above embodiments, it is preferable that the fluidized bed apparatus 4 includes a fluidized bed body 401, the fluidized bed body 401 is divided into a drying section 406 and a cooling section 407, and the drying section 406 and the cooling section 407 are separated by a partition 408.
In any of the above solutions, it is preferable that a plurality of built-in heaters 404 are provided inside the drying section 406 of the fluidized bed body 401.
In any of the above schemes, preferably, an inlet of each internal heater 404 is respectively communicated with a steam inlet pipe, and an outlet of each internal heater 404 is respectively communicated with a steam condensate water outlet pipe; the steam inlet pipe is used for introducing external steam into the built-in heater 404; the steam condensate outflow pipe is used for discharging the condensate inside each of the built-in heaters 404 to the outside.
In any of the above schemes, preferably, the drying air inlet system 2 includes a drying air filter group a, a drying blower 202, and a drying heat exchanger 203, which are sequentially connected through a pipeline from the outside to the inside, and an outlet end of the drying air inlet system 2 is connected to the inside of the drying section 406 of the fluidized bed body 401.
The dry air filter group A comprises two dry air filters 201 which are connected in parallel through pipelines, and the branch pipelines where the two dry air filters 201 are located are respectively provided with a filtering control opening valve 6.
The two arranged drying air filters 201 can be mutually standby, so that the service life and the use effect of the drying air filters 201 are greatly prolonged; simultaneously, also can open valve 6 with the filtration control of its both sides alone and close the back in time after one of them breaks down, then dismantle it and maintain to realize maintaining under the complete machine does not shut down state, also do not influence entire system's normal work when guaranteeing the convenience of maintenance, guarantee the sustainability of equipment operation, reduce the influence of shutting down to output.
In the process, the air entering the fluidized bed after passing through the drying air inlet system 2 can be effectively controlled, so that the materials in the fluidized bed can maintain a stable fluidized state and dry adipic acid together with each built-in heater 404 in the fluidized bed.
The dried qualified material enters the cooling section 407 of the fluidized bed body 401.
In any of the above schemes, preferably, the cooling air inlet system 3 includes a cooling air filter group B, a dehumidifier 302, and a cooling blower 303, which are sequentially connected through a pipeline from the outside to the inside, and an outlet end of the cooling air inlet system 3 is connected to the inside of the cooling section 407 of the fluidized bed body 401.
The cooling air filter group B comprises two cooling air filters 301 which are connected in parallel through pipelines, and filtering control opening valves 6 are respectively arranged on branch pipelines where the two cooling air filters 301 are located.
The two cooling air filters 301 can be mutually standby, so that the service life and the use effect of the cooling air filters 301 are greatly prolonged; simultaneously, also can open valve 6 with the filtration control of its both sides alone and close the back in time after one of them breaks down, then dismantle it and maintain to realize maintaining under the complete machine does not shut down state, also do not influence entire system's normal work when guaranteeing the convenience of maintenance, guarantee the sustainability of equipment operation, reduce the influence of shutting down to output.
The cooling air is subjected to double purification of the cooling air filter group B in sequence, dehumidification and cooling by the dehumidifier 302, pressurization by the cooling blower 303, and then enters the cooling section 407 of the fluidized bed body 401.
The cooling air introduced by the cooling air inlet system 3 can maintain the stable fluidization state of the materials in the fluidized bed, and cools the adipic acid together with each built-in cooler 405 in the fluidized bed.
And discharging the qualified product through a finished product discharge port 402 on the fluidized bed body 401, namely discharging the blocky material generated in the drying and cooling processes of the adipic acid from a bottom material discharge port 403 of the fluidized bed body 401.
In any of the above schemes, preferably, the dust removal system 5 includes a cyclone unit C, a washing tower 504, and a system induced draft fan 506 connected in sequence from upstream to downstream through a pipeline, and the dust removal system 5 is configured to receive the dust-containing gas discharged from the top of the fluidized bed body 401.
A circulating water pump 505 is connected to one side of the scrubber 504 through a pipeline, and mainly plays a role in power transmission for water circulation.
The cyclone dust collector unit C comprises two cyclone dust collectors 501 which are connected in series through pipelines, and a flow speed control pump 7 is arranged on the pipeline where the two cyclone dust collectors 501 are located.
The serially arranged cyclone dust collectors 501 can realize continuous dust removal, and meanwhile, gas passing through the upstream cyclone dust collector 501 can enter the downstream cyclone dust collector 501 at a higher speed after being accelerated by the flow rate control pump 7, so that dust removal is realized more effectively, and the dust removal effect is improved.
The bottom discharge port of each cyclone 501 is connected to the feed port of the mixer 101 and the inside of the cooling section 407 of the fluidized bed body 401.
The lower part of each cyclone 501 is provided with a three-way material distributing valve 503 which can control the amount of the dry adipic acid returned to the mixer 101.
The dust-containing gas discharged from the top of the fluidized bed body 401 enters a cyclone dust collector unit C of the dust removal system 5, the dust-containing gas sequentially passes through the cyclone dust collectors 501 for multi-stage dust removal, dry adipic acid powder is collected by each cyclone dust collector 501, a part of dry adipic acid enters a corresponding feed inlet of the mixer 101 through a cyclone dust collector discharge valve 502 and a three-way material distribution valve 503 and then is mixed with wet adipic acid, the temperature of the part of dry adipic acid is close to that of materials in a drying section 406 of the fluidized bed body 401, and the cold and heat loads of the fluidized bed cannot be increased after the part of dry adipic acid enters the fluidized bed body 401; the other dry adipic acid powder enters the cooling section 407 of the fluidized bed body 401 to be cooled and then discharged.
The built-in heater 404, built-in cooler 405 and the baffle 408 that the fluidized bed body 401 set up are followed down and are kept for 200 ~ 300mm apart from the grid plate, remain sufficient passageway for cubic material discharge in drying, the cooling fluidized bed to can guarantee material exhaust smoothness nature, avoid leading to the fact the fluidized bed to fluidize the weak because of expediting the unable timely getting rid of.
Compared with a common fluidized bed, the system does not need to cool the dry adipic acid required by mixing materials, and can better ensure the cooling depth of the adipic acid.
The cooling air inlet system 3 is provided with a dehumidifier 302 which can control the humidity and temperature of cooling air, ensure the cooling depth and prevent the moisture regain phenomenon caused by the contact of dry adipic acid with wet air.
And then is exhausted by a system induced draft fan 506 after secondary dust removal by a washing tower 504.
The absence of the built-in heater 404 in the feeding area of the adipic acid prevents the adipic acid from caking.
In any of the above embodiments, preferably, a plurality of internal coolers 405 are provided inside the cooling section 407 of the fluidized bed body 401.
In any of the above schemes, preferably, an inlet of each built-in cooler 405 is respectively communicated with a circulating water inlet pipe, and an outlet of each built-in cooler 405 is respectively communicated with a circulating water return pipe; the circulating water inlet pipe is used for introducing external circulating water into the built-in heater 404; the circulating water return pipe is used for discharging circulating water inside each of the built-in coolers 405.
In any of the above embodiments, it is preferable that the lower edge of the partition 408 is not lower than the lower edges of the respective built-in heaters 404 and the respective built-in coolers 405.
In any of the above schemes, preferably, the size of a space between the lower edge of the internal heater 404 and/or the internal cooler 405 and the air distribution plate inside the fluidized bed body 401 is 200-300 mm, and the space is a reserved discharge channel for the bulk material inside the fluidized bed body 401.
Avoid the fluidized bed to be weakened because the fast material can not be got rid of in time.
In any of the above schemes, preferably, a bed charge outlet 403 and a finished product outlet 402 are arranged at the downstream of the fluidized bed body 401, the bulk material is discharged out of the fluidized bed body 401 through the bed charge outlet, and the finished product outlet 402 is composed of an upper overflow port and a lower discharge valve.
In any of the above schemes, preferably, the lower part of the drying section 406 of the fluidized bed body 401 is connected to the drying air inlet system 2 through a plurality of air inlets, and the lower part of the cooling section 407 of the fluidized bed body 401 is connected to the cooling air inlet system 3 through a plurality of air inlets.
In any of the above schemes, it is preferable that the cooling air intake system 3 is provided with a dehumidifier 302, which controls the humidity and temperature of the cooling air, and prevents the moisture regain phenomenon caused by the contact of the dry adipic acid with the wet air while ensuring the cooling depth.
In any of the above schemes, preferably, the upper part of the fluidized bed body 401 is provided with a feed inlet and an exhaust outlet, the feed inlet is connected with the adipic acid mixed feed system 1, and the exhaust outlet is connected with the dust removal system 5.
The utility model also provides an utilize adipic acid fluidized bed device drying system to carry out the method that the adipic acid was handled, including following step:
s1: mixing wet adipic acid and dry adipic acid powder to form mixed powder;
s2: feeding the mixed powder into a fluidized bed body 401 of a drying system of an adipic acid fluidized bed device 4;
s3: the mixed powder is fluidized by drying and cooling in a fluidized bed;
s4: after the fluidization treatment, the fluidized bed respectively discharges the finished product of the blocky materials and the dust-containing gas;
s5: carrying out multi-stage dust removal separation on the discharged dust-containing gas to obtain multi-stage dust removal gas and dry adipic acid powder;
s6: carrying out secondary dust removal on the multistage dust removal gas;
s7: part of the obtained dry adipic acid powder is recycled to the step S1 to be mixed with wet adipic acid, and the rest is recycled to the step S3 to be cooled and then discharged with finished block materials.
In any of the above schemes, the weight part ratio of the dry adipic acid powder to the wet adipic acid in the S1 is preferably 1: 2.
In any of the above embodiments, the drying system of the adipic acid fluidized bed apparatus 4 in S1 is preferably the drying system of the adipic acid fluidized bed apparatus 4 described above.
In any of the above schemes, preferably, a material scattering step is further provided before the mixed powder enters the fluidized bed.
The working process is as follows:
the external wet adipic acid is discharged from the centrifuge and enters the mixer 101, and is mixed with a part of dry adipic acid powder (dry adipic acid powder: wet adipic acid ═ 1:2) collected from the cyclone 501 in the dust removing system 5 in the mixer 101, and the mixed material enters the drying section 406 of the fluidized bed body 401 through the disperser 102.
In the drying step 406, the drying air is sequentially purified by the drying air filter 201, the drying blower 202 is pressurized, and the heated drying air is introduced into the fluidized bed drying step 406 through the drying heat exchanger 203.
In the process, the air entering the fluidized bed after passing through the drying air inlet system 2 can be effectively controlled, so that the materials in the fluidized bed can maintain a stable fluidized state and dry adipic acid together with each built-in heater 404 in the fluidized bed.
The dust-containing gas discharged from the top of the fluidized bed body 401 enters a cyclone dust collector 501 of the dust removal system 5, the dust-containing gas firstly passes through the cyclone dust collector 501 for primary dust removal, dry adipic acid powder is collected by the cyclone dust collector 501, a part of dry adipic acid enters a corresponding feed inlet of the mixer 101 through a cyclone dust collector discharge valve 502 and a three-way material distribution valve 503 and then is mixed with wet adipic acid, the temperature of the part of dry adipic acid is close to that of the material in a drying section 406 of the fluidized bed body 401, and the cold and heat loads of the fluidized bed cannot be increased after the part of dry adipic acid enters the fluidized bed body 401; the other part of the dry adipic acid powder enters the cooling section 407 of the fluidized bed body 401, is cooled and then is discharged.
The built-in heater 404, built-in cooler 405 and the baffle 408 that the fluidized bed body 401 set up are followed down and are kept for 200 ~ 300mm apart from the grid plate, remain sufficient passageway for cubic material discharge in drying, the cooling fluidized bed to can guarantee material exhaust smoothness nature, avoid leading to the fact the fluidized bed to fluidize the weak because of expediting the unable timely getting rid of.
Compared with a common fluidized bed, the system does not need to cool the dry adipic acid required by mixing materials, and can better ensure the cooling depth of the adipic acid.
The cooling air inlet system 3 is provided with a dehumidifier 302 which can control the humidity and temperature of cooling air, ensure the cooling depth and prevent the moisture regain phenomenon caused by the contact of dry adipic acid with wet air.
And then is exhausted by a system induced draft fan 506 after secondary dust removal by a washing tower 504.
The absence of the built-in heater 404 in the feeding area of the adipic acid prevents the adipic acid from caking.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification; to those skilled in the art, any alternative improvements or changes made to the embodiments of the present invention are all within the scope of the present invention.
The parts of the present invention not described in detail are the known techniques of those skilled in the art.
Claims (9)
1. Adipic acid fluidized bed device drying system, its characterized in that: comprises an adipic acid mixed feeding system, a drying air inlet system, a cooling air inlet system, a fluidized bed device and a dust removal system;
the adipic acid mixing and feeding system is used for receiving wet adipic acid from the outside and dry adipic acid powder recovered by the dust removal system, the tail end of the adipic acid mixing and feeding system is connected with the fluidized bed device, the drying air inlet system and the cooling air inlet system are sequentially connected with the inside of the fluidized bed device, and the dust removal system is used for realizing the treatment and recovery of adipic acid dust discharged from the fluidized bed device.
2. The adipic acid fluidized bed apparatus drying system of claim 1, wherein: the fluidized bed device comprises a fluidized bed body, the interior of the fluidized bed body is divided into a drying section and a cooling section, and the drying section is separated from the cooling section through a partition plate.
3. The adipic acid fluidized bed apparatus drying system of claim 2, wherein: and a plurality of built-in heaters are arranged in the drying section of the fluidized bed body.
4. The adipic acid fluidized bed apparatus drying system of claim 3, wherein: and a plurality of built-in coolers are arranged in the cooling section of the fluidized bed body.
5. The adipic acid fluidized bed apparatus drying system of claim 4, wherein: and the lower edge of the partition plate is not lower than the lower edges of the built-in heaters and the built-in coolers.
6. The adipic acid fluidized bed apparatus drying system of claim 5, wherein: the size of a space between the lower edge of the built-in heater and/or the built-in cooler and the air distribution plate inside the fluidized bed body is 200-300 mm, and the space is a reserved discharge channel for the inner blocky materials of the fluidized bed body.
7. The adipic acid fluidized bed apparatus drying system of claim 6, wherein: the lower part of the fluidized bed body is provided with a bed charge outlet and a finished product outlet, the large materials are discharged out of the fluidized bed body through the bed charge outlet, and the finished product outlet consists of an upper overflow port and a lower discharge valve.
8. The adipic acid fluidized bed apparatus drying system of claim 7, wherein: the lower part of the drying section of the fluidized bed body is connected with the drying air inlet system through a plurality of air inlets, and the lower part of the cooling section of the fluidized bed body is connected with the cooling air inlet system through a plurality of air inlets.
9. The adipic acid fluidized bed apparatus drying system of claim 8, wherein: the upper portion of fluidized bed body is equipped with feed inlet and air exit, the feed inlet with adipic acid mixes feed system and links to each other, the air exit with dust pelletizing system links to each other.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121305071.4U CN214892178U (en) | 2021-06-10 | 2021-06-10 | Drying system of adipic acid fluidized bed device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113251746A (en) * | 2021-06-10 | 2021-08-13 | 山东奥诺能源科技股份有限公司 | Drying system and method of adipic acid fluidized bed device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113251746A (en) * | 2021-06-10 | 2021-08-13 | 山东奥诺能源科技股份有限公司 | Drying system and method of adipic acid fluidized bed device |
| CN113251746B (en) * | 2021-06-10 | 2023-12-08 | 山东奥诺能源科技股份有限公司 | Adipic acid fluidized bed device drying system and method |
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