Ceramic body far infrared drying and microwave drying technology
A far-infrared drying technology
Infrared radiation drying technology more and more people's attention all walks of life , in food drying , tobacco , wood , herbs, cardboard, cars, bicycles , metal body paint has played a significant role. Moreover , far -infrared drying are also used in the ceramic dried . Most of the infrared wavelength range absorbed by the object are in the far infrared region , and the ceramic body of water in the far infrared region have strong absorption peaks can strongly absorb far infrared rays to produce intense resonance phenomenon , the body heat up rapidly leaving dried. And far infrared illuminated objects than the penetration depth of near-, mid -infrared deep . Therefore, the use of far -infrared drying ceramic is more reasonable. Far infrared drying than hot air , heating and other heating method is an efficient drying , energy saving, time-saving , easy to use , uniform drying , small footprint , etc., so as to achieve a high yield , high quality, low consumption of good results.
According to the ceramics factory production proved , using far-infrared drying than the near-infrared drying time can be shortened by half , is air dried 1/10, a rate of 90 % or more blanks than the near- infrared drying saving 20 to 60 percent . Zhengzhou porcelain on the 10-inch flat panel for far-infrared drying technology implementation , the results show that doubling the production cycle , the drying time is usually 2.5 to 3 hours , shortened to one hour , low cost, small investment, quick , good sanitary conditions small footprint. Far infrared materials research is very active in recent years , and has made great progress .
2 microwave drying technology
Means between the microwave frequency electromagnetic waves and far infrared rays between the wavelength of 0.001-1m, a frequency of 300-300000MHz. Microwave drying wet body with microwave irradiation , electromagnetic direction and periodically changing the polarity of water molecules in the blank body with a high frequency alternating electric field , the molecules have a dramatic rotation friction into heat, achieve uniform heating body as a whole , the purpose of drying . Microwave penetration greater than the far infrared rays , and the frequency the smaller the greater the depth of the microwave half power .
3 Microwave drying characteristics
( 1 ) uniformly fast , which is the main characteristic of microwave drying . As has greater penetration of microwave heating time can generate heat directly inside the medium . No matter how complex the shape of the green body , rapid heating is uniform , which makes the body dehydrated quickly, releasing uniform deformation is small, easy to crack.
( 2 ) selective microwave heating and the nature of the material itself , in a certain frequency of the microwave field , the water because of its large dielectric loss than the other materials , the water absorption than other dry materials much heat ; the same time as microwave heating is table simultaneously , the internal water can be heated quickly and directly evaporated , so that the ceramic body in a very short period of time by heating the mold.
( 3 ) high thermal efficiency, response, and directly from the drying due to the heat within the material , the heat loss in the surrounding medium, rarely , with the microwave heating chamber itself does not heat , does not absorb microwave , all of the radiation effect on the body , the thermal efficiency high .
Microwave heating equipment mainly from the DC power supply, microwave tubes, connecting waveguide , heaters and cooling systems and several other components of microwave heated and the heater in accordance with the form of microwave field resonant standing wave field can be divided into the heater , traveling wave field waveguide heaters, radiant heaters , slow-wave -type heater and other categories .
4 Microwave drying applied in Ceramics
Hunan GuoGuang Ceramic Group Co., Ltd. , according to the technological characteristics of Ceramics , Ceramics designed a rapid dehydration drying line for the production , the practice has proved that , compared with conventional drying line chain , into a 10% increase in billet more time off the plaster mold shortened from 35 to 45 minutes to 5 to 8 minutes, using a mold number decreased from 400 ~ 500 100 ~ 120 induced , microwave drying line small footprint, non-polluting. Its efficiency is 6.5 times the dry -type chain , in addition to substantial savings plaster mold , but with the second line with the use of fast-drying , 10.5 -inch flat panel for total drying costs can be reduced by 350 yuan / ten thousand .
5 microwave drying in porcelain application
Liaoning Fushun Petrochemical Company , Li primal porcelain drying process using microwave heating and drying techniques , weight Kam read control technology, infrared temperature Kam read control technology, the complex shape of the porcelain to dry , with conventional steam drying method comparison can improve productivity 24 to 30 times , improve the yield of 15% to 35% , the same production area is only one twentieth of existing processes around , can greatly improve economic efficiency. This building and sanitary ceramics, tiles and some other special-shaped products, dry can provide reference.
Drying of porous ceramic porous ceramic Because of high mechanical strength, easy regeneration , chemical stability, heat resistance, pore distribution , etc., and has broad application prospects, and is widely used in chemical industry . Environmental protection, energy , metallurgy, electronics, petroleum , metallurgy, textile, pharmaceutical, food machinery, cement and other fields. As a sound-absorbing material sensitive components and bone , tooth root and other materials are also more and more people 's attention. As the porous material containing more moisture molding , pores , and the preform body very thin cell walls , using traditional methods due to uneven heating , very difficult to dry, coupled with the poor thermal conductivity of porous material , the drying process is particularly demanding , particularly for environmentally friendly cars and other aspects of honeycomb ceramics, poor control of the drying process , deformation, affecting porosity and specific surface area . Microwave drying technology has been successfully applied to a dry porous ceramics , which can easily put the green body of water from 18% to 25 % to 3%, precipitation rate of 0.7 ~ 1.5kg, greatly reducing the drying time and improve the finished product rate . We also used the microwave drying temperature of billet split brick drying , the effect is very obvious.
6 Prospects
Although there are many advantages of microwave heating , but its net fixed investment and production costs than other heating method is high , especially higher power , the production costs; microwave irradiation at high energy long under unfavorable to human health influence of microwave heating is selective . Therefore, a separate microwave drying or convective drying have their advantages and disadvantages . If the combination of the two will make the advantages of both methods to be fully exploited . I.e. in the fast drying chamber , increasing the microwave generator . In the body of the heat-up stage , the microwave generator is operating at maximum power in a very short period of time so that the body temperature. Then gradually reduce the microwave power , and air dried to maximum intensity running, so the total heating time will be reduced by 50 % and no increase in the total energy consumption , and body pass rate. Moreover, we should try to make even reasonable structural design microwave , radiation and appropriate measures microwave radiation can be minimized , no impact on the human body . Therefore, in order to better play the advantages of microwave technology , in addition to using mixed heating or mixing and drying technologies, strengthen and improve the ceramic material between the mechanism of action of microwave research, strengthen the dielectric properties of ceramic materials , media consumption and microwave frequency and temperature relations on the basis of data test, and perfect microwave drying technology and equipment to make this technology committee ceramic industry services.

 

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