CN104238439A - Device capable of controlling moisture content of fluidized bed drying air accurately - Google Patents
Device capable of controlling moisture content of fluidized bed drying air accurately Download PDFInfo
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- CN104238439A CN104238439A CN201410439070.7A CN201410439070A CN104238439A CN 104238439 A CN104238439 A CN 104238439A CN 201410439070 A CN201410439070 A CN 201410439070A CN 104238439 A CN104238439 A CN 104238439A
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Abstract
The invention provides a device capable of controlling the moisture content of fluidized bed drying air accurately. The device comprises an air inlet filter, a cooling dehumidifier, a rotary wheel dehumidifier, a fluidized bed, an induced draft fan and a data collecting controller. An air outlet of the air inlet filter is connected with an air inlet pipeline of the cooling dehumidifier. An air outlet of the cooling dehumidifier is communicated with an air inlet of the rotary wheel dehumidifier. A dust catcher, a bag shaking device, a sprayer and an air inlet heater are sequentially installed in the fluidized bed from top to bottom. An air outlet of the rotary wheel dehumidifier is communicated with an air inlet of the air inlet heater. An air inlet temperature sensor and an air speed sensor are arranged between the air outlet of the rotary wheel humidifier and the air inlet of the air inlet heater. An air outlet temperature sensor is arranged between an air inlet of the induced draft fan and an air outlet of the fluidized bed. The data collecting controller comprises a PLC host, a digital-to-analog converter and a power source. The device has the advantages of adapting to different climate conditions, adjusting the drying process condition of the fluidized bed accurately, shortening drying time, reducing heating of materials and saving energy sources.
Description
Technical field
The present invention relates to a kind of device that accurately can control fluidized bed dry air water capacity, belong to pharmaceutical engineering apparatus field.
Background technology
Fluid bed dryer is one of drying and facility for granulating the most conventional during current medicine manufactures.Powder suspension is become fluidized state with air stream by this equipment, sprays into wet liquid (or bonding agent) simultaneously, makes powder agglomeration become particle, realizes the dry step of granulation and completes.The particle fine uniform made, good fluidity, production efficiency is high, is therefore generally used.Affect particle to be formed and dry factor comprises the fineness of end powder, the concentration of wet liquid, hydrojet temperature and speed, gas flow temperature and flow etc.
Air humidity content as drying medium has significant impact for fluidized bed drying pelletization, usually requires lower water capacity.If excess moisture, the transfer rate of moisture is lower, and material heated time can be caused to extend, and increases energy resource consumption; If elevate air temperature, can accelerate the destruction of heat-sensitive substance, low melting point melting, causes particle adhesion.And in the different phase of drying and granulating, also different to the suitableeest requirement of aerial temperature and humidity.At end powder warm-up phase, low humidity high temperature air is better; At spray-drying stage, keep stable suitable aerial temperature and humidity for maintenance hydrojet-evaporation balance, particle is formed most important; In the particle drying stage, air themperature can not exceed the tolerable limit of material, and the humidity less time is shorter.Because fluidized bed drying generally adopts surrounding air, be inevitably subject to weather effect, cause process conditions unstable, differ greatly between product batches.In the southern area of China, plum rain season relative air humidity can reach more than 90%, produces and causes extreme difficulties, also can have a strong impact on drug quality to fluidized bed.
Existing part producer adds cooling and dehumidifying device at fluidized bed air inlet, to reduce air humidity at present.But air humidity content can not be down to below the dew point of coolant temperature by this device, be often still difficult to reach low humidity requirement.In addition, the water droplet condensed on heat exchangers, also likely by air-flow band blast pipe, weakens effect on moisture extraction.The air humidity content that this dehydrating unit exports is relatively fixing, can not adapt to the requirement of different process stage to air humidity.
Summary of the invention
The present invention is directed to current cooling and dehumidifying device and air humidity content can not be down to below the dew point of coolant temperature, often still be difficult to reach low humidity requirement, the water droplet that condenses on heat exchangers also likely by air-flow band blast pipe, weaken the problem of effect on moisture extraction, propose and a kind ofly can adapt to different weather conditions, fine adjustment fluid bed drying process condition, reaches and shortens drying time, reduces material and be heated and the device that accurately can control fluidized bed dry air water capacity of effect of economize energy.
The device that accurately can control fluidized bed dry air water capacity of the present invention, it is characterized in that: comprise air intake filtrator, cooling dehumidifier, rotary dehumidifier, fluidized bed, induced draft fan and data acquisition controller, the air outlet of described air intake filtrator is connected with the air inlet pipeline of described cooling dehumidifier, the air outlet of described cooling dehumidifier is communicated with the air inlet of described rotary dehumidifier; Described fluidized bed inside is equipped with dust catcher from top to bottom successively and is trembled bagging apparatus, sprayer and air intake well heater, the air outlet of described rotary dehumidifier is communicated with the air inlet of air intake well heater, and is provided with air inlet Temperature Humidity Sensor and the air velocity transducer converting air quantity according to airduct sectional area between the air inlet of described rotary dehumidifier air outlet and described air intake well heater; The air outlet of described fluidized bed is communicated with the air inlet of induced draft fan, and described fan inlet and fluidized bed air outlet are furnished with air outlet Temperature Humidity Sensor; Described data acquisition controller comprises PLC main frame, digital to analog converter, power supply, described air intake filtrator, cooling dehumidifier, rotary dehumidifier, induced draft fan and described air inlet Temperature Humidity Sensor, air velocity transducer and air outlet Temperature Humidity Sensor are all by being connected with the signal of described PLC main frame, and described power supply and described PLC main frame are electrically connected.
The air inlet of described rotary dehumidifier is furnished with regeneration wind well heater and regeneration wind filter, and wherein, the air outlet of regeneration wind filter is communicated with the air inlet regenerating wind well heater, the air inlet of the air outlet and rotary dehumidifier that regenerate wind well heater is communicated with.
Described cooling dehumidifier adopts the refrigerant circulation system from public refrigeration system or independent cooling unit.
Be silica gel, lithium chloride, lithium bromide, molecular sieve or their compound for the medium of adsorption moisture in rotary dehumidifier.
Described air intake Temperature Humidity Sensor and described air outlet Temperature Humidity Sensor tolerable temperature are 180-200 DEG C, and moisture measurement precision is within ± 5%, and temperature measurement accuracy is within ± 2 DEG C.
After air intake humiture, air quantity, air-out humiture data are collected, are analyzed by computing machine, provide real-time moisture removal:
Q＝(H
out-H
in)×V
air×α
Wherein, H
outfor air outlet absolute moisture content (g/m
3) converted by air outlet Temperature Humidity Sensor; H
in(g/m
3) be air inlet absolute moisture content (g/m
3), converted by air inlet Temperature Humidity Sensor; V
airrefer to wind speed (m/s); α is the experience reduction coefficient that airduct sectional area is corresponding, is recorded in advance by air velocity transducer.
The course of work of the present invention: air intake filtrator purifies air, then carries out elementary dehumidifying by dehumidification by condensation device, then by rotary adsorptive dehumidification, air moisture content is reduced to target level further.Air flows through air intake Temperature Humidity Sensor, air velocity transducer (can convert air quantity according to airduct sectional area), then target temperature is heated to by the heat interchanger of fluidized bed, flow through material bed after, tackle fine dusts by dust-removal cloth-bag, finally flow through air outlet Temperature Humidity Sensor.
The operation stage of drying and granulating can be judged: at powder warm-up phase, Q is close to 0 according to real-time moisture removal; In the spraying granulation stage, Q should be corresponding with the wet liquid water cut (or quantity of solvent) sprayed into, and maintain steady state (SS), illustrate evaporation capacity and straying quatity in a basic balance; In the particle drying stage, Q should progressively reduce, until tend towards stability.According to the situation of change of Q, can flexible induced draft fan power (rotating speed), rotary dehumidifier rotating speed (change air intake humidity), guarantee that particle size distribution and water cut meet the requirements.This device utilizes cooling and dehumidifying machine air moisture content can be reduced 70-90%, then by rotary dehumidifier, air is dried to target level further.By sensor, Real-Time Monitoring is carried out to process, and realize stability contorting by induced draft fan power and rotary dehumidifier rotating speed.
The invention has the beneficial effects as follows: 1) can adapt to high humidity environment condition operating mode, air intake air humidity content can be reduced to below 3g/kg by adsorption and dehumidification; 2) according to sensor measurement data and computational analysis, accurate judgement can be made to operation stage, reduce the bed that collapses, excessively and the risk of long-time heating, for guaranteeing between product batches consistance and energy-saving and cost-reducing significant; 3) by the multiple batches of production process data of accumulation, be conducive to progressively deepening the understanding to technological process, for Continual Improvement provides Data support; 4) the Q value of drying stage also directly reflects material moisture.More existing off-line sampling and measuring moisture method is sensitive more rapidly, and easy economy, practicality is good.
Accompanying drawing explanation
Fig. 1 is structural drawing of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing
With reference to accompanying drawing:
Embodiment 1 device that accurately can control fluidized bed dry air water capacity of the present invention, comprise air intake filtrator 11, cooling dehumidifier 12, rotary dehumidifier 13, fluidized bed 20, induced draft fan 24 and data acquisition controller 16, the air outlet of described air intake filtrator 11 is connected with the air inlet pipeline of described cooling dehumidifier 12, the air outlet of described cooling dehumidifier 12 is communicated with the air inlet of described rotary dehumidifier 13; Described fluidized bed 16 inside is equipped with dust catcher from top to bottom successively and is trembled bagging apparatus 23, sprayer 22 and air intake well heater 21, the air outlet of described rotary dehumidifier 13 is communicated with the air inlet of air intake well heater 21, and is provided with air inlet Temperature Humidity Sensor 31 and the air velocity transducer 32 converting air quantity according to airduct sectional area between the air inlet of described rotary dehumidifier 13 air outlet and described air intake well heater 21; The air outlet of described fluidized bed 20 is communicated with the air inlet of induced draft fan 24, and described induced draft fan 24 air inlet and fluidized bed 20 air outlet are furnished with air outlet Temperature Humidity Sensor 33; Described data acquisition controller 16 comprises PLC main frame, digital to analog converter, power supply, described air intake filtrator 11, cooling dehumidifier 12, rotary dehumidifier 13, induced draft fan 24 and sprayer 22, described air inlet Temperature Humidity Sensor 31, air velocity transducer 32 and air outlet Temperature Humidity Sensor 33 are all by being connected with the signal of described PLC main frame, and described power supply and described PLC main frame are electrically connected.
The air inlet of described rotary dehumidifier 13 is furnished with regeneration wind well heater 14 and regeneration wind filter 15, wherein, the air outlet regenerating wind filter 15 is communicated with the air inlet of rotary dehumidifier 13 with the air outlet that the air inlet of regeneration wind well heater 14 is communicated with, regenerates wind well heater 14.
Described cooling dehumidifier 12 adopts from the refrigerant circulation system of public refrigeration system or independent freon or environmental protection type refrigeration unit.
Be silica gel for the medium of adsorption moisture in rotary dehumidifier 13.
Described air intake Temperature Humidity Sensor 31 and described air outlet Temperature Humidity Sensor 33 tolerable temperature are 180-200 DEG C, and moisture measurement precision is within ± 5%, and temperature measurement accuracy is within ± 2 DEG C.
After air intake humiture, air quantity, air-out humiture data are collected, are analyzed by computing machine, provide real-time moisture removal:
Q＝(H
out-H
in)×V
air×α
Wherein, H
outfor air outlet absolute moisture content (g/m
3) converted by air outlet Temperature Humidity Sensor; H
in(g/m
3) be air inlet absolute moisture content (g/m
3), converted by air inlet Temperature Humidity Sensor; V
airrefer to wind speed (m/s); α is the experience reduction coefficient that airduct sectional area is corresponding, is recorded in advance by air velocity transducer.
The course of work of the present invention: air intake filtrator purifies air, then carries out elementary dehumidifying by dehumidification by condensation device, then by rotary adsorptive dehumidification, air moisture content is reduced to target level further.Air flows through air intake Temperature Humidity Sensor, air velocity transducer (can convert air quantity according to airduct sectional area), then target temperature is heated to by the heat interchanger of fluidized bed, flow through material bed after, tackle fine dusts by dust-removal cloth-bag, finally flow through air outlet Temperature Humidity Sensor.
The operation stage of drying and granulating can be judged: at powder warm-up phase, Q is close to 0 according to real-time moisture removal; In the spraying granulation stage, Q should be corresponding with the wet liquid water cut (or quantity of solvent) sprayed into, and maintain steady state (SS), illustrate evaporation capacity and straying quatity in a basic balance; In the particle drying stage, Q should progressively reduce, until tend towards stability.According to the situation of change of Q, can flexible induced draft fan power (rotating speed), rotary dehumidifier rotating speed (change air intake humidity), guarantee that particle size distribution and water cut meet the requirements.This device utilizes cooling and dehumidifying machine air moisture content can be reduced 70-90%, then by rotary dehumidifier, air is dried to target level further.By sensor, Real-Time Monitoring is carried out to process, and realize stability contorting by induced draft fan power and rotary dehumidifier rotating speed.
Content described in this instructions embodiment is only enumerating the way of realization of inventive concept; protection scope of the present invention should not be regarded as being only limitted to the concrete form that embodiment is stated, protection scope of the present invention also comprises those skilled in the art and conceives the equivalent technologies means that can expect according to the present invention.
Claims (6)
1. accurately can control the device of fluidized bed dry air water capacity, it is characterized in that: comprise air intake filtrator, cooling dehumidifier, rotary dehumidifier, fluidized bed, induced draft fan and data acquisition controller, the air outlet of described air intake filtrator is connected with the air inlet pipeline of described cooling dehumidifier, the air outlet of described cooling dehumidifier is communicated with the air inlet of described rotary dehumidifier; Described fluidized bed inside is equipped with dust catcher from top to bottom successively and is trembled bagging apparatus, sprayer and air intake well heater, the air outlet of described rotary dehumidifier is communicated with the air inlet of air intake well heater, and is provided with air inlet Temperature Humidity Sensor and the air velocity transducer converting air quantity according to airduct sectional area between the air inlet of described rotary dehumidifier air outlet and described air intake well heater; The air outlet of described fluidized bed is communicated with the air inlet of induced draft fan, and described fan inlet and fluidized bed air outlet are furnished with air outlet Temperature Humidity Sensor; Described data acquisition controller comprises PLC main frame, digital to analog converter, power supply, described air intake filtrator, cooling dehumidifier, rotary dehumidifier, induced draft fan and described air inlet Temperature Humidity Sensor, air velocity transducer and air outlet Temperature Humidity Sensor are all by being connected with the signal of described PLC main frame, and described power supply and described PLC main frame are electrically connected.
2. accurately can control the device of fluidized bed dry air water capacity as claimed in claim 1, it is characterized in that: the air inlet of described rotary dehumidifier is furnished with regeneration wind well heater and regeneration wind filter, wherein, the air inlet of the air outlet regenerating wind filter is communicated with the air inlet of regeneration wind well heater, regenerate wind well heater air outlet and rotary dehumidifier is communicated with.
3. accurately can control the device of fluidized bed dry air water capacity as claimed in claim 1, it is characterized in that: described cooling dehumidifier adopts from the refrigerant circulation system of public refrigeration system or independent freon or environmental protection type refrigeration unit.
4. accurately can control the device of fluidized bed dry air water capacity as claimed in claim 1, it is characterized in that: be silica gel, lithium chloride, lithium bromide, molecular sieve or their compound for the medium of adsorption moisture in rotary dehumidifier.
5. accurately can control the device of fluidized bed dry air water capacity as claimed in claim 1, it is characterized in that: described air intake Temperature Humidity Sensor and described air outlet Temperature Humidity Sensor tolerable temperature are 180-200 DEG C, moisture measurement precision is within ± 5%, and temperature measurement accuracy is within ± 2 DEG C.
6. accurately can control the device of fluidized bed dry air water capacity as claimed in claim 1, it is characterized in that: after air intake humiture, air quantity, air-out humiture data are collected, are analyzed by computing machine, provide real-time moisture removal:
Q＝(H
out-H
in)×V
air×α
Wherein, H
outfor air outlet absolute moisture content (g/m
3) converted by air outlet Temperature Humidity Sensor; H
in(g/m
3) be air inlet absolute moisture content (g/m
3), converted by air inlet Temperature Humidity Sensor; V
airrefer to wind speed (m/s); α is the experience reduction coefficient that airduct sectional area is corresponding, is recorded in advance by air-quantity measuring device.
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| CN201410439070.7A CN104238439B (en) | 2014-08-29 | 2014-08-29 | Device capable of controlling moisture content of fluidized bed drying air accurately |
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| CN104238439B CN104238439B (en) | 2017-01-18 |
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Cited By (5)
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| TWI651496B (en) * | 2016-08-31 | 2019-02-21 | 創昇科技股份有限公司 | Temperature-based adaptive dehumidification sysyem |
| CN110131965A (en) * | 2019-05-10 | 2019-08-16 | 特一药业集团股份有限公司 | A kind of bangxiaoan preparation facility for granulating and bangxiaoan production technology |
| CN110208322A (en) * | 2019-06-24 | 2019-09-06 | 河南科技大学 | A kind of grain drier and its grain measurement of moisture content method |
| CN110398771A (en) * | 2019-06-26 | 2019-11-01 | 浙江国辐环保科技有限公司 | A kind of device using tritium in condensation method acquisition air |
| CN113483552A (en) * | 2017-03-30 | 2021-10-08 | 特吕茨施勒有限及两合公司 | Module for determining the residual moisture of a web of fabric for use in a dryer |
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| CN113483552A (en) * | 2017-03-30 | 2021-10-08 | 特吕茨施勒有限及两合公司 | Module for determining the residual moisture of a web of fabric for use in a dryer |
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| CN110208322B (en) * | 2019-06-24 | 2022-03-18 | 河南科技大学 | Grain drying machine and grain moisture detection method thereof |
| CN110398771A (en) * | 2019-06-26 | 2019-11-01 | 浙江国辐环保科技有限公司 | A kind of device using tritium in condensation method acquisition air |
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