Energy-saving and environment-friendly pneumatic drying device for crystals

Abstract

The utility model relates to an energy-saving and environment-friendly pneumatic drying device for crystals, which is particularly suitable for a finished product preparation process of crystals with the average mesh number of 40-200, taking small crystal monosodium glutamate as an example, wet crystal raw materials are sequentially subjected to vibrated fluidized bed drying and pneumatic drying and are output to a packaging device, and finished products at a discharge port of a pneumatic cyclone separator are packaged. Large particles are sequentially connected to a crusher and an airflow feeding section, an airflow outlet is connected to a fan, and then connected to an air inlet of a fluidized bed and a discharge port of a pre-drying cyclone separator or / and a pre-drying bag-type dust collector and connected to the airflow feeding section, so that the defects of an existing vibrated fluidized bed and an airflow drying process can be avoided; the method has the advantages of high investment cost performance, low maintenance and operation cost, good environmental protection property of exhausted tail gas, low crystallization rate, low acid damage rate and good finished product brightness.

Description

TECHNICAL FIELD

[0001] The utility model relates to drying equipment technical field, concretely is a kind of energy-saving and environment-friendly type airflow drying device of crystalline body. BACKGROUND

[0002] There are many crystalline materials, including inorganic salts (sodium chloride, sodium sulfate, calcium carbonate, silicate, etc.), organic compounds (citric acid, some amino acids, etc.), chemical intermediates (ammonium sulfate, etc.), etc. The particle size varies, and the small crystalline amino acids include monosodium glutamate, threonine, citrulline, glutamic acid, alanine, isoleucine and valine. The present application uses monosodium glutamate (sodium glutamate) as a typical material for demonstration. The monosodium glutamate crystallizes into needle-like shape, and the decomposition temperature is relatively high (about > 150℃).

[0003] Currently, the drying methods for monosodium glutamate include airflow drying and vibration fluidized bed drying. The principles and structures of vibration fluidized bed drying and airflow drying are different. One requires low wind speed, and the other requires high wind speed, which are exactly opposite. They cannot be used as reference to each other, and they do not belong to the same technical field. Airflow drying is a technology that suspends and quickly dries wet materials by high-speed hot air. It is suitable for processing small particles and relatively stable crystalline bodies with heat, but the dust amount is large, and there is a risk of heat damage. Vibration fluidized bed drying has good uniformity and low breakage, but high energy consumption. Monosodium glutamate was previously crystallized in batches, with a particle size of 1-2 mm, and was mainly dried by vibration fluidized bed. Now, the continuous crystallization process is mainly used, with a smaller particle size, about 40-200 mesh on average. When using vibration fluidized bed drying, a large amount of crystal is easily produced, the drying is uneven, and the product has poor visual brightness, thus the feasibility is relatively low. When using airflow drying process, the airflow drying temperature is usually controlled at 80-150℃, which will not cause decomposition or deterioration of monosodium glutamate. The moisture content of monosodium glutamate is moderate, generally about 4-6% (wet basis). Airflow drying can quickly remove the surface and internal moisture to a final moisture content of ≤0.3%. The traditional airflow drying of monosodium glutamate has the following problems:

[0004] 1. In airflow drying, the flow direction of wet crystals and airflow is the same. The airflow temperature is the highest during the wet material stage, the drying speed and capacity are fast, and in the last heat exchange stage, the airflow temperature decreases, the humidity increases, and the moisture content of monosodium glutamate decreases, which greatly slows down the drying speed and capacity. At the same time, the airflow drying time is only a few seconds, which results in low heat energy utilization rate of airflow drying, and a large amount of heat energy in the exhaust gas is not utilized. For every ton of monosodium glutamate product, 0.2-0.4 tons of steam and about 18-28 degrees of electricity are consumed to dry from 5% wet basis to below 0.3%, which has high energy consumption. It requires an average of 6 tons of steam to dry one ton of water, and it is difficult to achieve a moisture content of less than 0.25% in the product. The power in the later drying stage is severely low.

[0005] 2. Because of the airflow drying only for a few seconds, it is not suitable for the material with high moisture content, large particle size and containing crystal water. For monosodium glutamate, it is better to operate at high wind speed to facilitate the dispersion and rapid drying of monosodium glutamate particles, which leads to excessive friction of monosodium glutamate particles in the airflow, resulting in the finished product with reduced particle surface brightness and whitening phenomenon, and the broken product produces dust, the drying is too fast in the early stage, the crystal is more prone to cracking and powder crystal.

[0006] 3. The wet crystal coming out of the centrifuge is not completely dehydrated, when the wet basis is greater than 3%, the airflow drying pipe is easy to stick to the wall and block, frequent shutdown for cleaning is required, the normal continuous operation time is only 1-2 days, the equipment maintenance cost accounts for about 6%-12% of the total drying link cost per year, and there is acid loss due to long-time contact with high-temperature gas after the monosodium glutamate is coated, resulting in coking or decomposition, yellow particles appear in the finished product, affecting the product quality, and shutdown for cleaning causes material loss.

[0007] 4. There are a lot of dust and powder crystals in the finished product, which causes easy caking and hygroscopicity, the dried monosodium glutamate has high hygroscopicity (humidity environment about 60% RH), some enterprises use film packaging + desiccant, but small and medium-sized factories still have substandard packaging problems.

[0008] 5. There is a safety hazard of dust explosion, particles with a particle size of less than 100 um are explosive, the minimum explosive concentration is about 30 g / m³, and small and medium-sized enterprises lack explosion-proof measures, and flash explosion has occurred.

[0009] 6. It depends on coal / gas-fired boiler heating, and the carbon emission intensity is high, the monosodium glutamate industry requires a 8%-10% reduction in energy consumption per unit of output value, some enterprises try to use biomass fuel or waste heat recovery, but the cost increases by about 15%-20%.

[0010] 7. The exhaust gas of the drying system contains trace amounts of organic volatile substances (VOCs) and dust, and the environmental protection investment is large. Practical new type content

[0011] The utility model aims at providing a kind of energy-saving and environment-friendly type crystalline airflow drying device, it is especially suitable for the finished product preparation of crystalline with average number of 40-200, can avoid the defects of existing vibration fluidized bed and airflow drying process, with the comprehensive advantages of high investment cost performance, low maintenance and operation cost, good exhaust tail gas environmental protection, low crystal rate, low acid loss rate and good finished product brightness.

[0012] The technical scheme to realize the above-mentioned purpose is: an energy-saving and environment-friendly type crystalline airflow drying device for drying wet crystal, characterized by comprising vibration fluidized drying system and airflow drying system connected in sequence, and wet crystal is sequentially dried by vibration fluidized drying system and airflow drying system and then output.

[0013] The vibration fluidization drying system comprises a vibration fluidized bed, a fluidized bed feeding port, a fluidized bed air inlet, a fluidized bed discharging port and a fluidized bed air outlet, the fluidized bed air outlet of the vibration fluidization drying system is connected with a dust removal device, the dust removal device adopts a pre-drying cyclone separator or / and a pre-drying bag dust collector, and the dust removal device is provided with a discharging port;

[0014] The air flow drying system comprises an air flow heater, an air flow drying pipe and an air flow cyclone separator connected in sequence, the air flow cyclone separator is provided with a discharging port and an air outlet connected with a fan;

[0015] The fluidized bed discharging port is communicated with the air flow drying pipe, and the air outlet of the fan is connected to the fluidized bed air inlet.

[0016] The application of the air flow drying device to monosodium glutamate drying is taken as an example to specifically explain the beneficial effects of the utility model:

[0017] The utility model realizes that the material loss is reduced, the operation energy consumption is greatly reduced, the energy consumption of each ton of finished product is less than 0.1 tons of steam, the surface of the finished product particle has the natural luster of the crystal body, the crystal combination phenomenon is less, the broken phenomenon is less, the system continuous operation time can be greater than 3 days, the air flow drying system pipeline can realize more than half a year without cleaning, and has the comprehensive effects of greatly reducing the dark color particle of the finished product formed due to high temperature, reducing the moisture absorption of the finished product, reducing the dust explosion risk, and greatly reducing the exhaust gas discharge amount.

[0018] The utility model adopts the drying process that the vibration fluidization drying system and the air flow drying system are combined, wherein the role of the vibration fluidized bed drying is gentle preliminary drying, most of the crystal surface moisture is dried, the adhesion between the crystal particles is reduced, the crystal moisture content is reduced to below 2.5%, and preferably to below 1.5%, so as to ensure that the crystal does not adhere to the inner wall of the air flow drying system pipeline, especially the inner wall of the air flow drying system feeding section, and the wet crystal block is dispersed, the wet crystal is dispersed under the action of air flow and vibration, preliminary drying is carried out, and the powder crystal caused by direct and rapid drying of the air flow drying is avoided, because the crystal surface liquid is concentrated after preliminary drying, and the operating wind speed of the vibration fluidized bed is much lower than that of the air flow drying, the secondary crystallization and coating of the crystal surface liquid are avoided, the surface brightness of the crystal is increased, and the strength of the crystal is increased.

[0019] The role of the air flow drying is high-temperature short-time treatment, the final moisture content and the finished product quality are ensured, the material is prevented from denaturation due to long-time drying, and the crystal combination is prevented, because most of the surface moisture of the crystal is dried by the vibration fluidized bed, the heat and air volume required by the air flow drying are greatly reduced, the semi-wet crystal can be deeply dried, and preferably, the temperature, wind speed and drying time of each part are intelligently controlled, the hot air flow and the feeding speed are automatically adjusted, the moisture content of the finished product is ensured, the particle surface has glossiness, and the crystal combination is less.

[0020] The utility model discloses still through the exhaust gas of air flow drying part or all directly back to the vibration fluidized bed drying, realize the energy saving of large amplitude, can save energy 1 / 3 to 3 / 4, greatly reduce the air quantity, heat and exhaust air volume required for air flow drying, the exhaust gas of air flow drying has the characteristics of high temperature and high humidity than ambient temperature, the temperature of air flow drying inlet air is much lower, under the action of this gentle drying force, in the vibration fluidized bed, it is more easy to avoid the crack caused by the rapid drying of crystal surface, and it is beneficial to the surface brightness of finished product, and the recrystallization and coating phenomenon of crystal surface are also better.

[0021] Further, the air path of the vibration fluidized drying system is a fluidized bed air inlet, a vibration fluidized bed, a dust removal device and an exhaust, and the material path of the vibration fluidized drying system is a fluidized bed feeding port, a vibration fluidized bed, a fluidized bed discharge port and a discharge port connected to an air flow drying pipe.

[0022] Further, the air flow feeding section is connected in series to the air flow drying pipe, and the fluidized bed discharge port and the discharge port are respectively connected to the air flow feeding section.

[0023] The material output by the dust removal device has the characteristics of unqualified water content and fine particle size, which is directly fed into the air flow drying pipe to realize deep drying, avoid material loss and mix finished product particles.

[0024] Further, the discharge port is provided with a pneumatic conveying system, and the pneumatic conveying system comprises a pneumatic conveying fan and a pneumatic conveying pipe connected in sequence, the discharge port is connected to the pneumatic conveying pipe of the pneumatic conveying system, and the outlet of the pneumatic conveying pipe is connected to the air flow drying pipe.

[0025] The pneumatic conveying system directly feeds the unqualified material output by the dust removal device into the air flow drying pipe to realize deep drying, avoid material loss and mix finished product particles.

[0026] Further, the discharge port is connected to the air flow drying pipe through a spiral conveying device. The spiral conveying device can directly feed the unqualified material output by the dust removal device into the air flow drying pipe to realize deep drying, avoid material loss and mix finished product particles.

[0027] Further, the fluidized bed feeding port is provided with a vibrating distributor, the vibrating distributor is provided with a distributor process air inlet and a distributor process air outlet, and the wet crystal raw material is input into the vibration fluidized bed through the vibrating distributor.

[0028] The vibrating distributor is used for receiving the wet crystal raw material from the outside, and the function is to uniformly distribute and convey the wet crystal to the vibration fluidized bed, and to preliminarily disperse and reduce the possibility of crystal agglomeration, and to preliminarily reduce the moisture of the wet crystal, thereby reducing the possibility of material hardening at the feeding port of the vibration fluidized bed.

[0029] The process air inlet of the distributor is connected to the process air, which blows away part of the water on the surface of the crystal, reduces the possibility of clumping and the possibility of powder crystal, and is beneficial to the better performance of the vibrating fluidized bed. Further, the process air inlet of the distributor is directly connected to the ambient air, which has weak water carrying capacity and is gentle in carrying water, thereby further reducing energy consumption and being beneficial to the better performance of the vibrating fluidized bed.

[0030] Further, the air heat exchanger is connected to the exhaust outlet of the dust removal equipment, the exhaust gas of the dust removal equipment is cooled, dehumidified and dedusted by the air heat exchanger, and the heat exchange air outlet of the air heat exchanger is connected to the inlet of the airflow heater and / or the process air inlet of the distributor.

[0031] The heat in the exhaust gas of the vibrating fluidized bed is reused after heat exchange by the air heat exchanger, thereby further reducing the energy consumption. In addition, the exhaust gas in the air heat exchanger has high humidity, and there is condensation during the heat exchange and temperature reduction process, which can adsorb dust and greatly reduce the dust discharge of the exhaust gas, thereby achieving the functions of energy saving, consumption reduction and environmental protection.

[0032] Further, the heat exchange air outlet of the air heat exchanger is also connected to the inlet of the fan, which is beneficial to improving the drying intensity and supplementing the air volume of the vibrating fluidized bed and / or the vibrating distributor.

[0033] Further, the discharge outlet of the airflow cyclone separator is sequentially connected to the cyclone fan and the screening machine, the large particle outlet of the screening machine is sequentially connected to the crusher and the airflow drying pipe, and the non-large particle outlet of the screening machine outputs the finished dry material.

[0034] The large particle material discharged from the airflow cyclone separator has many disadvantages such as clumping, crystal aggregation, excessive water content and low bulk density. After being coarsely crushed by the crusher, the material is directly sent to the airflow drying for deep drying and mixing.

[0035] The cooperation of the screening machine and the crusher not only ensures the qualified particle size and water content of the finished product, but also increases the bulk density and reduces the hygroscopicity of the finished product due to the reduction of small crystal aggregates.

[0036] Further, the crusher is a universal crusher, and the outlet of the universal crusher is sequentially connected to the crushed material conveying device and the airflow feeding section. Preferably, the crusher is adjusted by frequency conversion to control the crushing force, so that the large particles can be crushed without excessive crushing to increase the amount of dust. Preferably, gravity conveying is adopted, i.e. the crushed material conveying device is omitted.

[0037] Further, the outlet of the fan is connected to the fan outlet bypass, the fan outlet bypass is connected to the dust removal equipment and / or the process air inlet of the vibrating distributor, and the process air outlet of the distributor is connected to the dust removal equipment.

[0038] The inlet bypass of the fan is connected to the inlet of the fan, which takes air from the atmosphere. The function is to adjust the temperature and humidity of the process air at each location, achieve the required process air temperature and humidity for airflow drying and vibration fluidized bed drying, and achieve the adjustment and balance of the required air volume and heat for vibration fluidized bed and airflow drying.

[0039] Further, the inlet of the drying fan is connected to the drying fan inlet bypass, which takes air from the atmosphere. The function is to adjust the temperature and humidity of the process air at each location, achieve the required process air temperature and humidity for airflow drying and vibration fluidized bed drying, and achieve the adjustment and balance of the required air volume and heat for vibration fluidized bed and airflow drying.

[0040] Further, the inlet of the drying fan is connected to the drying fan inlet bypass, which takes air from the atmosphere. The function is to adjust the temperature and humidity of the process air at each location, achieve the required process air temperature and humidity for airflow drying and vibration fluidized bed drying, and achieve the adjustment and balance of the required air volume and heat for vibration fluidized bed and airflow drying.

[0041] Further, a plurality of airflow feeding sections are connected in series on the airflow drying pipe, and pulse airflow is used. The airflow feeding section is a Venturi tube or pulse type. Multiple airflow feeding sections are used to accommodate different materials entering and different heights of material entering, such as the discharge of the vibration fluidized bed, which is suitable for the reduced diameter pipe of the Venturi feeder. The discharge of the dust removal equipment is more suitable for being connected above the reduced diameter pipe of the Venturi feeder.

[0042] Further, the main body of the airflow drying pipe can have multiple variable diameter pipes or flow guide devices to adjust airflow speed, control temperature, wind speed and residence time in sections. Through dynamic adjustment of thermodynamic parameters, the heat transfer efficiency is optimized, and the problems of high energy consumption and uneven product of single machine drying pipe are solved.

[0043] Further optimization: The process air entering the process air inlet of the distributor is preferably the ambient air entering the process air inlet bypass of the distributor. The water carrying capacity of the ambient air is relatively weak, which can further reduce energy consumption and help the vibration fluidized bed to better perform its function.

[0044] Further, the operating air speed at the air distribution plate of the vibration fluidized bed is 0.1-0.6 m / s, and the air speed in the airflow drying pipe is 6-15 m / s, which can better achieve preliminary drying and reduce the breaking force of airflow drying, and better achieve the above functions.

[0045] In view of the problems of the air flow drying of small crystal monosodium glutamate in the prior art, firstly, the wet crystal before entering the drying tube should be uniform and dispersed, so as to reduce the lumping and crystal from the source; the lower the moisture of the wet crystal entering the drying tube, the lower the viscosity, and the less likely to stick to the pipe wall. The effect of the front centrifugation should also be good, most large enterprises use high-efficiency centrifuges, and the moisture content after dehydration can be reduced to below 5% (wet basis), but the phenomenon of wet crystal sticking to the pipe wall still exists, and it still needs to be cleaned once every day or so, and the continuous production effect is poor.

[0046] Therefore, the idea of the utility model is: the wet crystal is pre-dried by the vibration fluidized bed to remove a considerable part of the surface water, and the more water blown away, the better, the temperature and humidity in the pre-drying process should be appropriate, and the drying air speed is relatively low. If the drying is too fast and too high, the liquid on the surface of the crystal will become powder crystal, and cracks will be generated on the surface of the crystal, and if the temperature is too high, the monosodium glutamate will deteriorate, the surface of the particle will become dry and lose luster, and if the air speed is too high, the particles will rub against each other. Microscopically, monosodium glutamate is a needle-shaped crystal, which is easy to break and easy to break, and macroscopically, the amount of system dust increases; deep drying is carried out by using air flow drying to prevent crystal. In order to create a "dust-free" workshop, the system must be equipped with dust removal equipment to avoid running, leaking, and intelligent control of the air speed, drying time and temperature at each position, reduce the breakage of the crystal, also reduce the system dust, and the surface of the particle has luster, avoids discoloration, acid damage, the system recovers most of the heat in multiple places, reduces the air volume and heat of the system, and also reduces the dust discharge amount and environmental protection pressure of the system, achieves the functions of energy saving and environmental protection.

[0047] After the initial pre-drying of the vibration type distributor and the secondary pre-drying of the vibration fluidized bed process, most of the surface water of the wet crystal can be removed, and the viscosity of the wet crystal is reduced, so that it is less likely to stick to the air flow drying pipe wall; the vibration device in the vibration type distributor and the vibration fluidized bed process can also disperse the wet crystal, which is beneficial to the evaporation of the surface water, the recrystallization of the crystal surface, and the reduction of the possibility of crystal and lumping; the design of the air flow feeding section in the air flow drying system controls the collision strength of the particles, balances the crystal rate and the particle collision breakage rate, improves the product particle size, uniformity and surface brightness. The combination of the whole air flow drying process reduces the system energy consumption and the dust discharge amount, and the maintenance cost of the system. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 The system schematic diagram of the first embodiment;

[0049] Figure 2 The system schematic diagram of the second embodiment.

[0050] In the figure: drying blower 1, airflow heater 4, airflow drying pipe 5, vibrating fluidized bed 6, vibrating distributor 7, air conveying fan 9, crusher 10, screening machine 11, air induction fan 12, air heat exchanger 13, pre-drying cloth bag dust collector 15, pre-drying cyclone separator 16, airflow cyclone separator 17, cyclone fan 18, fan 19, airflow cloth bag dust collector 20, discharge port 21, screw conveying device 22, pulverized material conveying device 23;

[0051] Airflow feeding section 51;

[0052] Fluidized bed feeding port 61, fluidized bed air inlet 62, fluidized bed air outlet 63, fluidized bed discharge port 64;

[0053] Distributor process air inlet 71, distributor process air outlet 72;

[0054] Air conveying feeding section 91, air conveying air pipe 92;

[0055] Drying blower inlet bypass 101, distributor process air inlet bypass 102

[0056] Fan inlet bypass 191, fan outlet bypass 192. DETAILED DESCRIPTION

[0057] The utility model discloses an energy -conserving and environment -friendly crystalline body airflow drying device, suitable for the average number of 40-200 of crystalline amino acid's finished product preparation process, the utility model takes small crystalline body monosodium glutamate drying as an example, but is not limited to monosodium glutamate drying, the following preferred configuration equipment composition is increased or decreased according to specific needs, all do not constitute the limitation to the utility model. Example one

[0058] As Figure 1 Shown, an energy -conserving and environment -friendly crystalline body's airflow drying device for wet crystal drying, including vibrating fluidized drying system and airflow drying system that connect gradually, wet crystal is outputted after drying in vibrating fluidized drying system and airflow drying system gradually.

[0059] Vibrating fluidized bed 6 has fluidized bed feeding port 61, fluidized bed air inlet 62, fluidized bed discharge port 64, fluidized bed air outlet 63, and the fluidized bed air outlet 63 of vibrating fluidized bed 6 is connected to dust removal equipment, and the dust removal equipment adopts pre-drying cloth bag dust collector 15 and pre-drying cyclone separator 16, the fluidized bed discharge port 64 of vibrating fluidized bed 6 is connected to airflow drying pipe 5, the fluidized bed air outlet 63 of vibrating fluidized bed 6 is connected to the air inlet of pre-drying cyclone separator 16, the air outlet of pre-drying cyclone separator 16 is connected to the air inlet of pre-drying cloth bag dust collector 15, and the air outlet of pre-drying cloth bag dust collector 15 is connected to air induction fan 12.

[0060] The inlet of the fluidized bed feeding port 61 is provided with a vibrating distributor 7, which can be one of a vibrating conveyor, a vibrating distributor and a vibrating screen. The vibrating distributor 7 is provided with a distributor process air inlet 71 and a distributor process air outlet 72. The wet crystal raw material is input into the vibrating fluidized bed 6 through the vibrating distributor 7.

[0061] The air flow drying system comprises, in sequence, a drying blower 1, an air flow heater 4, an air flow drying pipe 5, an air flow cyclone separator 17, and an air flow bag dust collector 20. The air flow bag dust collector 20 is connected to a fan 19 at an air outlet thereof. The fan 19 is connected to the fluidized bed air inlet 62 at an air outlet thereof.

[0062] The outlet of the air induction fan 12 in the vibrating fluidized drying system is connected to an air heat exchanger 13. The air heat exchanger is an indirect heat exchange type air-air heat exchanger, which can be, but is not limited to, the energy-saving heat exchanger device for drying equipment tail gas disclosed in patent No. 202222178689X. The exhaust gas of the pre-drying bag dust collector 15 is discharged after being cooled, dehumidified and dedusted by the air heat exchanger 13. The heat exchange air outlet of the air heat exchanger 13 is connected to the inlet of the drying blower 1.

[0063] The discharge port of the air flow cyclone separator 17 in the air flow drying system is connected, in sequence, to a cyclone air lock fan 18 and a screening machine 11. The large particle outlet of the screening machine 11 is connected, in sequence, to a crusher 10 and an air flow feeding section 51. The non-large particle outlet of the screening machine 11 outputs the finished product to a packaging process.

[0064] The fan outlet bypass 192 is connected to the vibrating distributor process air inlet 71. The distributor process air outlet 72 is connected to the air inlet of the pre-drying bag dust collector 15, so as to realize the collection and treatment of unqualified dust and the filtration of exhaust tail gas.

[0065] The air flow drying system comprises, in sequence, a drying blower 1, an air flow heater 4, an air flow drying pipe 5, an air flow cyclone separator 17, and an air flow bag dust collector 20. The air flow bag dust collector 20 is connected to a fan 19 at an air outlet thereof. The fan 19 is connected to the fluidized bed air inlet 62 at an air outlet thereof.

[0066] Further, the discharge port 21 of the pre-drying cloth bag dust collector 15 and the pre-drying cyclone separator 16 is provided with a pneumatic conveying system, which comprises a pneumatic conveying fan 9 and a pneumatic conveying air pipe 92 connected in sequence, the discharge port 21 of the pre-drying cloth bag dust collector 15 and the pre-drying cyclone separator 16 is connected with a pneumatic conveying feeding section 91 connected in series on the pneumatic conveying air pipe 92, and the outlet of the pneumatic conveying air pipe 92 is connected with the airflow feeding section 51, so that the unqualified material in the pre-drying cloth bag dust collector 15 and the pre-drying cyclone separator 16 is directly sent to the airflow drying device to realize deep drying, avoid material loss, and mix the finished product with different particle sizes.

[0067] Further, the pneumatic conveying feeding section 91 can adopt one or more of a Venturi tube type, a pulse type, a straight pipe type, and a inclined tee type, and one or more sections can be arranged on the pneumatic conveying air pipe 92. Figure 1 Fig. 6 shows a schematic view of the inclined tee type of the pneumatic conveying feeding section 91. Embodiment Two

[0068] As shown in Fig. 2, compared with the embodiment one, Figure 2

[0069] In this embodiment, the pre-drying cyclone separator 16 is omitted, and the discharge port 63 of the fluidized bed is directly connected with the feeding port of the pre-drying cloth bag dust collector 15.

[0070] In this embodiment, the discharge port of the pre-drying cloth bag dust collector 15 is connected with the airflow feeding section 51 through a screw conveying device 22, the screw conveying device 22 replaces the pneumatic conveying system in the embodiment one, the screw conveying device 22 can directly send the unqualified material in the pre-drying cloth bag dust collector 15 to the airflow drying device to realize deep drying, avoid material loss, and mix the finished product with different particle sizes, and the screw conveying device 22 is not limited to the screw conveying and pneumatic conveying system disclosed in the embodiment one and two, but can also adopt any conveying form disclosed in the prior art.

[0071] In this embodiment, the crusher 10 is a universal crusher, and the outlet of the universal crusher 10 is connected with the airflow feeding section 51 through a crushed material conveying device 23.

[0072] In this embodiment, the fan outlet bypass 192 is connected to the air inlet of the pre-drying cloth bag dust collector 15 to replace the connection of the vibration cloth feeder process air inlet 71 in the embodiment one, the air inlet of the vibration fluidized bed 6 is adjusted through the fan outlet bypass 192 to realize the adjustment of the effect of gentle drying and the adjustment of the air volume, and the system can be balanced.

[0073] ​The drying blower 1 is connected with a drying blower inlet bypass 101, and the drying blower inlet bypass 101 is connected with air from the atmosphere; the fan 19 is connected with a fan inlet bypass 191, and the fan inlet bypass 191 is connected with air from the atmosphere; the functions are to adjust the temperature and humidity of the process air at each place, to realize the temperature and humidity of the process air required by the air flow drying and the vibration fluidized bed drying, and to realize the adjustment and balance of the air volume required by the vibration fluidized bed and the air flow drying.

[0074] Further, the heat exchange air outlet of the air heat exchanger 13 in the embodiment can also be connected to the fan inlet bypass 191 and the vibration distributor process air inlet 71, so as to improve the drying intensity and the air volume of the vibration fluidized bed 5 and the vibration distributor 7, and when the route of the first embodiment is adopted, the drying intensity and the air volume of the vibration distributor 7 are improved.

[0075] The vibration distributor process air inlet 71 is provided with a vibration distributor process air inlet bypass 102, and the process air entering the vibration distributor process air inlet 71 can also be the ambient air entering the vibration distributor process air inlet bypass 102; the water carrying capacity of the ambient air is weak, and the water carrying is gentle, so that the energy consumption is further reduced, and the vibration fluidized bed can better play a role.

[0076] In the embodiment, the air flow feeding section 51 is provided with two, which are connected with the discharge port of the screw conveying device 22 and the crushed material conveying device 23, respectively; the air flow feeding section 51 can be but is not limited to a Venturi tube type, a pulse type and a straight pipe type, and a plurality of feeding sections 51 are used to adapt to different materials entering and different heights of the materials entering, for example, the discharge of the vibration fluidized bed 6 is more suitable to be connected to the reduced diameter pipe of the Venturi feeder, and the discharge of the discharge port 21 is more suitable to be connected to the reduced diameter pipe of the Venturi feeder. Figure 1 and Figure 2 It can be seen that the inclined tee type has two forms of conforming to the air flow direction or being opposite to the air flow direction.

[0077] The working process of the utility model:

[0078] The wet crystal raw material sequentially passes through the vibration distributor, the vibration fluidized bed drying and the air flow drying, and is output to the packaging process; the unqualified products are processed in the drying system, and the qualified products are packaged.

[0079] Taking monosodium glutamate as an example, the wet crystal is obtained from a high-efficiency centrifuge, such as a horizontal screw centrifuge; if the viscosity of the mother liquor is too high, steam can be used for heating to reduce the viscosity; after centrifugal dewatering, the moisture content can be reduced to below 6% (wet crystal).

[0080] The wet crystal first enters the vibrating distributor 7, which preliminarily disperses, reduces and prevents agglomeration of the wet crystal, and preliminarily reduces the moisture of the wet crystal, reduces the possibility of agglomeration of the material at the inlet 61 of the fluidized bed, and uniformly distributes and transports the wet crystal to the vibrating fluidized bed 6. At this time, the moisture of the wet crystal can be reduced to 4-5%, which is beneficial to the better performance of the vibrating fluidized bed. The vibrating distributor 7 discharges to the inlet 61 of the fluidized bed, and is connected to the pre-drying bag dust collector 15 through the air outlet 72 of the distributor process to realize the collection and treatment of unqualified dust and the filtration of exhaust gas.

[0081] The function of the vibrating fluidized bed drying is gentle preliminary drying, which dries most of the surface moisture of the crystal, reduces the adhesion between the crystal particles, and reduces the moisture content of the monosodium glutamate to below 2.5%, preferably below 1.5%, to ensure that it will not adhere to the inner wall of the air flow drying pipe 5, especially the inner wall of the air flow feeding section 51, and at the same time disperses the wet crystal agglomerates. Under the action of air flow and vibration, the wet crystal is dispersed and further preliminarily dried to avoid the direct and rapid drying of the air flow drying, which causes the powder crystal. After preliminary drying, the liquid on the surface of the crystal is concentrated, and the operating wind speed of the vibrating fluidized bed is much lower than that of the air flow drying, which has a secondary crystallization and coating effect on the crystal surface, increasing the surface brightness of the crystal and the strength of the crystal. The monosodium glutamate after centrifugal dewatering has slight adhesion, and the vibration and air flow double action avoids local overheating or insufficient drying. The wet material in the vibrating fluidized bed 6 is dried by air flow and transported forward by vibration at the same time, and the fine particles collected in the separation chamber enter the pre-drying cyclone separator 16 or / and the pre-drying bag dust collector 15 with the wind, and the fine particles collected are input into the air flow feeding section 51 for re-drying as finished products.

[0082] The material discharged from the pre-drying cyclone separator 16 or / and the pre-drying bag dust collector 15 has the characteristics of unqualified moisture content and fine particle size, which can be deeply dried by directly entering the air flow drying, avoiding material loss and mixing of finished product particles. This part of the particle surface has good brightness and can be directly used as finished product after deep drying. The conveying method can be natural falling by gravity, air conveying or spiral conveying.

[0083] The material output from the vibrating fluidized bed 6 is connected to the air flow feeding section 51, and the function of the air flow drying is high-temperature short-time treatment to ensure the final moisture content and product quality, avoid material denaturation due to long-time drying, and prevent crystal agglomeration. Because the vibrating fluidized bed has dried most of the surface moisture, the heat and air volume required for air flow drying is greatly reduced, and semi-wet crystal can be deeply dried. Preferably, the temperature, wind speed and drying time of each part are intelligently controlled, and the hot air flow and feeding speed are automatically adjusted to ensure that the finished product moisture is qualified, the particle surface has glossiness, and the crystal agglomeration is less.

[0084] The filtered fresh air is heated by the airflow heater 4 and then enters the airflow drying tube 5. The airflow drying tube 5 has multiple sections of variable diameter pipes or airflow guiding devices to adjust the airflow speed, control the temperature, airflow speed and residence time in sections. The small diameter pipe disperses the material at high speed, the large diameter pipe reduces the speed and prolongs the residence time, reduces the particle collision and breakage rate, and alternately performs, which can improve the product particle size uniformity and surface brightness.

[0085] By dynamically adjusting the thermodynamic parameters, the heat transfer efficiency is optimized, and the problems of high energy consumption and uneven product of single machine drying tube are solved. The airflow drying process is provided with an airflow cyclone separator 17 and an airflow bag dust collector 20. The dust collected by the airflow bag dust collector 20 is mostly 200-300 mesh fine particles, which can be directly dissolved and recrystallized or treated separately. The tail wind filtered by the airflow bag dust collector 20 is discharged at a temperature of 75-100℃, containing a large amount of heat, which can be selected to be provided to the fluidized bed air inlet 62 and the distributor process air inlet 71. The process air inlet 71 enters the process air, blows away part of the water on the crystal surface, reduces the possibility of clumping and powdering, and is beneficial to the better performance of the vibrating fluidized bed.

[0086] Preferably, the process air entering the distributor process air inlet 71 is ambient air, which has a weak water-carrying capacity and is more gentle in water-carrying, which can further reduce energy consumption and is beneficial to the better performance of the vibrating fluidized bed. By directly returning part or all of the exhaust air of the airflow drying to the vibrating fluidized bed drying, a large amount of energy can be saved, which can save 1 / 3 to 3 / 4 of the energy, greatly reducing the air volume, heat and exhaust air volume required for airflow drying. The exhaust air of the airflow drying has the characteristics of higher temperature and higher humidity than the ambient temperature, and lower temperature than the airflow drying inlet air. Under the action of this gentle drying force, it is easier to avoid the rapid drying of the crystal surface in the vibrating fluidized bed, which is beneficial to the surface brightness of the finished product and the recrystallization phenomenon on the crystal surface.

[0087] Preferably, the operating air speed at the air distribution plate of the vibrating fluidized bed 6 is 0.1-0.6 m / s, and the air speed in the airflow drying tube 5 is 6-15 m / s, which can better realize the preliminary drying and reduce the breakage force of the airflow drying, and better realize the above functions.

[0088] The discharge port of the air flow cyclone separator 17 is connected with a cyclone air lock 18 and a screening machine 11 in sequence, the large particle outlet of the screening machine 11 is connected to a crusher 10 and an air flow feeding section 51 in sequence, and the finished product outlet of the screening machine 11 is connected to a packaging device. In addition to ensuring the qualified particle size and water content of the finished product, the product bulk density is improved and the hygroscopicity is reduced due to the significant reduction of crystal and small lumps. After crushing the large particles, the large particles are sent to the air flow drying to realize further drying and mixing of the large particles. The crusher 10 is a universal crusher, and the outlet of the universal crusher 10 is connected to a conveying device 23 and the air flow feeding section 51 in sequence. Preferably, the crusher 10 adopts frequency conversion adjustment to control the crushing force, so that the large particles can be crushed without excessive crushing to increase the amount of dust. Preferably, gravity conveying is adopted, and the conveying device 23 is not needed. When gravity conveying cannot be used, the conveying device 23 needs to be additionally increased.

[0089] An air heat exchanger 13 is connected to the outlet of the air inducing fan 12, the air heat exchanger 13 exchanges heat with fresh air, and the air heat exchanger 13 is connected to the drying air blower 1 or / and the cloth feeder process air inlet 71. The exhaust gas of the pre-drying bag-type dust collector 15 is cooled, dehumidified and dedusted by the air heat exchanger 13 and then is exhausted. The function is to reduce the heat in the exhaust gas of the vibrating fluidized bed, to realize the reuse of a large part of the heat through the air heat exchanger 13, to reduce the energy consumption, to absorb dust and greatly reduce the exhaust dust discharge due to the large humidity of the exhaust gas in the air heat exchanger 13 and the condensation phenomenon in the heat exchange and temperature reduction process, and to realize the functions of energy saving and consumption reduction and environmental protection.

[0090] The process air entering the cloth feeder process air inlet 71 can be input through the fan outlet bypass 192 connected to the outlet pipeline of the fan 19 or can be the environmental air entering the cloth feeder process air inlet bypass 102. The water carrying capacity of the environmental air is relatively weak, the water carrying is more gentle, the energy consumption can be further reduced, and it is beneficial to the better play of the vibrating fluidized bed. The cloth feeder process air outlet 72 can be connected to the pre-drying bag-type dust collector 15.

[0091] The fan outlet bypass 192 is used to adjust the air volume of the vibrating fluidized bed 6 or / and the vibrating cloth feeder 7, to realize the effect adjustment of gentle drying and the air volume adjustment, and the system can be balanced.

[0092] The drying air blower 1 is connected with a drying air blower inlet bypass 101, the drying air blower inlet bypass 101 takes air from the environment, and the fan inlet is connected with a fan inlet bypass 191, the fan inlet bypass 191 takes air from the environment. The function is to adjust the temperature and humidity of the process air at each place, to realize the temperature and humidity of the process air required by the air flow drying and the vibrating fluidized bed drying, and to realize the adjustment and balance of the air volume required by the vibrating fluidized bed and the air flow drying.

[0093] The fresh air channel of the air heat exchanger 13 is connected to the fan inlet bypass 191 at the same time, so as to improve the drying intensity of the vibrating fluidized bed 5 or / and the vibrating distributor and supplement the air volume.

[0094] The fan outlet bypass 192 is connected to the fan outlet pipeline, and the fan outlet bypass 192 is connected to the pre-drying bag-type dust collector 15 or / and the vibrating distributor process air inlet 71; the distributor process air outlet 72 is connected to the pre-drying bag-type dust collector 15; by means of the fan outlet bypass 192, the air volume of the vibrating fluidized bed 6 or the vibrating distributor 7 is adjusted, the effect of gentle drying is adjusted, and the air volume is adjusted; and the system can be balanced.

[0095] Therefore, the comprehensive effects of reducing the loss of running materials, greatly reducing the energy consumption, reducing the energy consumption per ton of product to less than 0.1 tons of steam, the surface of the product particles having a natural luster of crystal, less crystal phenomenon, less crushing phenomenon, the continuous running time being greater than 3 days, the airflow drying pipe being cleaned for more than half a year, the dark particles in the product due to high temperature being greatly reduced, the hygroscopicity of the product being reduced, the risk of dust explosion being reduced, and the exhaust gas volume being greatly reduced are realized.

[0096] The utility model also gives the technical prompt of the rest combination, such as the heat exchange air outlet of the air heat exchanger 13 being connected to the air inlet 62 of the vibrating fluidized bed, the distributor process air inlet 71 and the drying air blower 1 at the same time; the fan 19 air outlet being connected to the distributor process air inlet 71 and the fluidized bed air inlet 62 at the same time; the vibrating fluidized bed adopting the equipment of the rest drying mode; the airflow adopting the equipment of the rest drying mode; and the vibrating distributor 7 being provided with a separate dust removal equipment.

[0097] The above-mentioned terms in the implementation scheme and working process are all prior art.

Claims

1. A flow drying device of energy saving and environment friendly crystalline body for drying of wet crystalline body, characterized in that: The vibration fluidization drying system and the airflow drying system are connected in sequence, and the wet crystal is sequentially dried by the vibration fluidization drying system and the airflow drying system and then output; The vibration fluidization drying system comprises a vibration fluidized bed (6), and the vibration fluidized bed (6) has a fluidized bed feeding port (61), a fluidized bed air inlet (62), a fluidized bed discharging port (64), and a fluidized bed air outlet (63). The fluidized bed air outlet (63) of the vibration fluidized bed (6) is connected to a dust removal device, and the dust removal device adopts a pre-drying cyclone separator (16) or / and a pre-drying bag dust collector (15). The dust removal device has a discharging port (21). The airflow drying system comprises an airflow heater (4), an airflow drying pipe (5), and an airflow cyclone separator (17) connected in sequence. The discharging port of the airflow cyclone separator (17) outputs dry materials, and the air outlet is connected to a fan (19). The fluidized bed discharging port (64) is communicated with the airflow drying pipe (5), and the air outlet of the fan (19) is connected to the fluidized bed air inlet (62).

2. The energy-saving and environment-friendly airflow drying device for crystalline bodies according to claim 1, characterized in that: The air path of the vibration fluidization drying system is the fluidized bed air inlet (62), the vibration fluidized bed (6), the dust removal device, and the exhaust. The material path of the vibration fluidization drying system is the fluidized bed feeding port (61), the vibration fluidized bed (6), and the fluidized bed discharging port (64). The discharging port (21) is communicated with the airflow drying pipe (5).

3. The energy-saving and environment-friendly airflow drying device for crystalline bodies according to claim 1, characterized in that: The airflow drying pipe (5) is connected in series with an airflow feeding section (51). The fluidized bed discharging port (64) and the discharging port (21) are respectively connected to the airflow feeding section (51).

4. The energy-saving and environment-friendly airflow drying device for crystalline bodies according to claim 1, characterized in that: The discharging port (21) is provided with an air conveying system, which comprises an air conveying fan (9) and an air conveying air pipe (92) connected in sequence. The discharging port (21) is connected to the air conveying air pipe (92) of the air conveying system. The outlet of the air conveying air pipe (92) is connected to the airflow drying pipe (5).

5. The energy-saving and environment-friendly airflow drying device for crystalline bodies according to claim 1, characterized in that: The discharging port (21) is connected to the airflow drying pipe (5) through a spiral conveying device (22).

6. The energy-saving and environment-friendly airflow drying device for crystalline bodies according to claim 1, characterized in that: The fluidized bed feeding port (61) is provided with a vibrating distributor (7) provided with a distributor process air inlet (71) and a distributor process air outlet (72). The wet crystal raw material is input into the vibration fluidized bed (6) through the vibrating distributor (7).

7. The energy-saving and environment-friendly airflow drying device for crystalline bodies according to claim 1 or 6, characterized in that: The exhaust port of the dust removal device is connected to an air heat exchanger (13). The exhaust gas of the dust removal device is cooled, dehumidified, and dedusted by the air heat exchanger (13) and then exhausted. The heat exchange air outlet of the air heat exchanger (13) is connected to the inlet of the airflow heater (4) or / and the distributor process air inlet (71).

8. The energy-saving and environment-friendly airflow drying device for crystalline bodies according to claim 1, characterized in that: The discharging port of the airflow cyclone separator (17) is connected in sequence to a cyclone air lock fan (18) and a screening machine (11). The large particle outlet of the screening machine (11) is connected in sequence to a crusher (10) and the airflow drying pipe (5).

9. The energy-saving and environment-friendly airflow drying device for crystalline bodies according to claim 1 or 6, characterized in that: The air outlet of the fan (19) is connected to a fan outlet bypass (192), which is connected to the dust removal device or / and the vibrating distributor process air inlet (71).

10. The energy-saving and environment-friendly airflow drying device for crystalline bodies according to claim 1, characterized in that: The air inlet of the fan (19) is connected to a fan inlet bypass (191), which takes air from the atmosphere.

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