CN101544383B - Method for microwave drying of sodium chloride - Google Patents
Method for microwave drying of sodium chloride Download PDFInfo
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- CN101544383B CN101544383B CN2009100944356A CN200910094435A CN101544383B CN 101544383 B CN101544383 B CN 101544383B CN 2009100944356 A CN2009100944356 A CN 2009100944356A CN 200910094435 A CN200910094435 A CN 200910094435A CN 101544383 B CN101544383 B CN 101544383B
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- Prior art keywords
- microwave
- sodium chloride
- heating
- cavity
- conveyer belt
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 title claims abstract description 94
- 239000011780 sodium chloride Substances 0.000 title claims abstract description 47
- 238000001035 drying Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 22
- 208000002925 dental caries Diseases 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 238000009423 ventilation Methods 0.000 abstract 3
- 239000002245 particle Substances 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 239000002893 slag Substances 0.000 abstract 1
- 229910052719 titanium Inorganic materials 0.000 abstract 1
- 239000010936 titanium Substances 0.000 abstract 1
- 238000007599 discharging Methods 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012797 qualification Methods 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention relates to a method for microwave drying of sodium chloride, which comprises the following steps: using the sodium chloride of which the water content is between 0.8 and 4 weight percent as a raw material; adopting a continuous microwave drying device; according to relatively fixed microwave power, changing the ventilation volumes of different microwave cavities, further adjusting parameters such as the transporting rate of materials in the microwave cavities, the thickness of the material and the like; and mounting a stirrer and cavity clapboards in the microwave drying device.The ventilation volumes of ventilation devices in the microwave cavities are controlled to be between 1,247 and 2,250 m<3>/h, the speed rate of a conveying belt is between 0.5 and 2 meters per minute, the thickness of material layers is controlled to be between 1 and 5 centimeters, the stirrer and the cavity clapboards are arranged on the microwave drying device, a roll-type breaking plant is arranged in front of a discharge port, and the particle size of the sodium chloride is controlled to be less than 3 millimeters, thus the method achieves the effect that the mass water content of high-titanium slag is dried to be less than 0.5 percent from 0.8 to 4 percent at drying temperature of between 65 and 70 DEG C.
Description
One, technical field
The present invention relates to a kind of method of microwave drying sodium chloride, belong to the heating using microwave applied technical field.
Two, background technology
Nearly all industrial circle all has dry this link of heating power, and the material that relates to reaches tens thousand of kinds.Dry materials belongs to the high energy consumption industry, and according to incompletely statistics, the energy of global 10-25% is used for industrial heating power drying, and the dry used energy accounts for about 12% of national economy total energy consumption in China.And the low situation of the dry on the other hand industry ubiquity thermal efficiency, the pollution that produces of dry run simultaneously also is the main source of China's environmental pollution, steam drying workshop especially, the harmful substance that is produced: flue dust, CO
2, SO
2And minor N O
2, these materials all are the principal elements that causes atmosphere greenhouse effects, acid rain and ozone layer destroying.
Present known drying means is more, and some new drying means have also appearred in swinging drying, fluidized bed drying, pneumatic conveying drying etc. in recent years, as spray-drying, roller drying, rotary disk posture drying etc.These drying modes are that hot dry air or steam are sent into hothouse, directly enter atmosphere after absorbing the moisture of the material that is dried, and the major defect of existence has: (1) energy utilization efficiency is low.Because the hot humid air of discharging contains a large amount of sensible heats and latent heat, therefore cause the energy utilization efficiency of conventional drying equipment generally all very low, the highest also have only about 35%; (2) arid cycle is long.The mode of heating of conventional drying technology is an external heat, and heat can only transmit from outside to inside, and heating is slow, and drying time is long; (3) product lack of homogeneity; (4) drying equipment is backward in technique, and is difficult in maintenance, and part technology easily causes the loss of material and the decline of quality, has both increased production cost, reduces the rate of recovery, contaminated environment again.
Because microwave has preferential selectivity heat characteristic to glassware for drinking water, especially for the drying of metallurgical material, the plan that its efficient drying object mainly is a minute quantity removes moisture, greatly reduces energy consumption, and has effectively avoided the discharging of greenhouse gases and pollutant.
The present invention is directed to the sodium chloride of water content at 0.8-4 quality %, be dried to below the 0.5 quality %, to make full use of microwave Fast Heating, selectivity mode of heating, by stirrer and pair roller breaker are set, solve in the sodium chloride dry run defectives such as surface crust and granularity do not meet the demands to a certain extent in microwave device.
Three, summary of the invention
The object of the present invention is to provide a kind of method of microwave drying sodium chloride, adopt continuous microwave dryer, by the relative fixed microwave power, the exhausting amount of the different microwave cavities of conversion, by regulating parameters such as the transfer rate of material in microwave cavity, material thickness, stirrer and pair roller breaker are set, on the basis of effective control sodium chloride baking temperature, reduce the sodium chloride granularity, and under energy saving condition, realize the drying of sodium chloride.
The present invention is based on following mode realizes:
(1), moisture content is placed the feed arrangement of microwave dryer at the sodium chloride of 0.8-4 quality %, sodium chloride is joined on the conveyer belt by hopper, conveyer belt speed 0.5-2m/min, bed of material baffle plate is set on the conveyer belt, distance between controllable register and the conveyer belt, the control thickness of feed layer is 1-5cm, makes material be transported in the microwave cavity continuously under the situation that keeps consistency of thickness;
(2), dispose moisture teller on the feed arrangement, detect the variation of moisture in the sodium chloride automatically, and moisture value is reflected on the control panel;
(3), microwave dryer is composed in series by 3-15 heating using microwave cavity and cavity body, behind per 2 heating using microwave cavitys 1 cavity body is set, each heating cavity configuration magnetron, speed by the control conveyer belt, and then regulate the time of staying of material in microwave cavity, thereby the temperature that reaches sodium chloride in the control dry run is 65-70 ℃;
(4), the top, interval of per 2 heating using microwave cavitys installs extractor fan, the exhausting amount of extractor fan reaches 1247-2250m
3/ h guarantees that the steam that the sodium chloride of different moisture content produces in time discharges from microwave cavity in dry run, effectively prevented in the microwave cavity " dewfall ", prevent that promptly cavity inner wall from having the globule to separate out, in case dewfall, the part microwave will heat the globule, cause energy loss;
(5), on conveyer belt, settle stirrer, material is carried out stirring, avoid the sodium chloride crust;
(6), magnetron adopts copper ring-type cooler, water flowing is cooled off, and has effectively improved the service life of magnetron, what is more important has been avoided the generation of microwave output power relaxation phenomenon;
(7), at the afterbody of drawing mechanism, roller type crushing device is installed, oarse-grained sodium chloride is crushed to below the 3mm.
Technological principle of the present invention is and adopts microwave drying, does not need heat conduction from outward appearance to inner essence, but directly carries out drying by microwave in the energy dissipation of material internal moisture, can remove moisture timely and effectively; The electric medium constant of water is very high, and room temperature condition is issued to 78, belongs to strong suction ripple material, utilizes the microwave selective heating, need not whole material is heated, and only the moisture in the material is heated, thereby realizes dry saving energy and reduce the cost; Utilize the volume-heated characteristics of microwave, microwave directly penetrates material inside, and the moisture of material inside and outside portion is heated simultaneously, has effectively improved the dynamic conditions of moisture removal, has improved the thermal efficiency; By under the condition of specified microwave power, exhausting amount, control conveyer belt speed can be carried out drying at a lower temperature simultaneously; By setting up stirrer, effectively avoided the crust phenomenon of sodium chloride, further improved rate of drying; Set up the pair roller breaker at discharging opening at last, the granularity of sodium chloride is controlled at below the 3mm, improved the factor of merit and the qualification rate of product.
The present invention has following advantage:
(1) because sodium chloride itself does not absorb microwave, under the condition of fixedly microwave power, exhausting amount, adjusting conveyer belt speed, when sodium chloride temperature during at 65-70 ℃, can effectively reduce temperature below the moisture drying to 0.5% with moisture 0.8-4%, realize energy-saving and cost-reducing;
(2) by at feed arrangement configuration moisture teller, can regulate conveyer belt speed automatically to the sodium chloride of different moisture content, compare with the manual adjustments and the fixing control of existing microwave drying instrument, energy-saving effect is remarkable;
(3) with magnetron by the air-cooled water-cooled of being replaced by, improved service life, guarantee the stability of microwave input power, avoided the decay of microwave power;
(4) on conveyer belt, set up stirrer, effectively avoided the crust phenomenon of sodium chloride, further improved rate of drying;
(5) before discharging, set up roller type crushing device, the granularity of sodium chloride is controlled at below the 3mm, improved the factor of merit and the qualification rate of product.
Four, description of drawings
Fig. 1 is the microwave drying process device connection diagram.
Five, the specific embodiment
Embodiment 1: with moisture content is that the sodium chloride of 1.0 quality % is dry object, the microwave output power that adopts is 12kW, behind per 2 microwave cavities 1 cavity is set, 6 magnetrons of each cavity configuration, each magnetron power is 1.5kW, frequency is 2450MHz, and the control thickness of feed layer is 2cm, and the exhausting amount is 1247m
3/ h, line speed is 1.5m/min, the temperature of sodium chloride is 65 ℃ in the microwave cavity, the input and output material of continuous 2h, the moisture of discharging opening sodium chloride all is lower than 0.5 quality %, average out to 0.48%, by calculating, microwave drying sodium chloride, its dehydrating amount are 0.41kg/kWh, the power consumption 42kWh that promptly dry material per ton needs.
Embodiment 2: with moisture content is that the sodium chloride of 3.5 quality % is dry object, the microwave output power that adopts is 18kW, behind per 2 microwave cavities 1 cavity is set, 6 magnetrons of each cavity configuration, each magnetron power is 1.5kW, frequency is that 2450MHz control thickness of feed layer is 1.5cm, and the exhausting amount is 2250m
3/ h, line speed is 1m/min, the temperature of sodium chloride is 70 ℃ in the microwave cavity at this moment, by the input and output material of continuous 4h, the moisture of discharging opening sodium chloride all is lower than 0.5 quality %, average out to 0.46%, by calculating, microwave drying sodium chloride, its dehydrating amount are 0.38kg/kWh, the power consumption 8kWh that promptly dry material per ton needs.
Claims (3)
1. the method for a microwave drying sodium chloride, it is characterized in that: it is implemented in the following manner,
(1), moisture content is placed the feed arrangement of microwave dryer at the sodium chloride of 0.8-4 quality %, sodium chloride is joined on the conveyer belt by hopper, conveyer belt speed 0.5-2m/min, bed of material baffle plate is set on the conveyer belt, distance between controllable register and the conveyer belt, realize that thickness of feed layer is controlled at 1-5cm, material is transported in the heating using microwave cavity under the situation that keeps consistency of thickness continuously;
(2), dispose moisture teller on the feed arrangement, detect the variation of moisture in the sodium chloride automatically, and moisture value is reflected on the control panel;
(3), microwave dryer is composed in series by 3-15 heating using microwave cavity and cavity body, behind per 2 heating using microwave cavitys 1 cavity body is set, each heating using microwave cavity configuration magnetron, speed by the control conveyer belt, and then regulate the time of staying of material in the heating using microwave cavity, the temperature of sodium chloride is 65-70 ℃ in the control dry run;
(4), the top, interval of per 2 heating using microwave cavitys installs extractor fan, the exhausting amount of extractor fan reaches 1247-2250m
3/ h guarantees that the steam that the sodium chloride of different moisture content produces in time discharges from the heating using microwave cavity in dry run;
(5), on conveyer belt, settle stirrer, material is carried out stirring, avoid the sodium chloride crust;
(6), magnetron adopts copper ring-type cooler, water flowing is cooled off;
(7), at the afterbody of drawing mechanism, roller type crushing device is installed, oarse-grained sodium chloride is crushed to below the 3mm.
2. the method for microwave drying sodium chloride according to claim 1, it is characterized in that: with moisture content is that the sodium chloride of 1.0 quality % is dry object, the microwave output power that adopts is 12kW, behind per 2 heating using microwave cavitys 1 cavity body is set, 6 magnetrons of each heating using microwave cavity configuration, each magnetron power is 1.5kW, frequency is 2450MHz, the control thickness of feed layer is 2cm, and the exhausting amount is 1247m
3/ h, line speed is 1.5m/min, the temperature of sodium chloride is 65 ℃ in the heating using microwave cavity.
3. the method for microwave drying sodium chloride according to claim 1, it is characterized in that: with moisture content is that 3.5% sodium chloride is dry object, the microwave output power that adopts is 18kW, each magnetron power is 1.5kW, frequency is 2450MHz, the control thickness of feed layer is 1.5cm, and the exhausting amount is 2250m
3/ h, line speed is 1m/min, baking temperature is 70 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100944356A CN101544383B (en) | 2009-05-06 | 2009-05-06 | Method for microwave drying of sodium chloride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100944356A CN101544383B (en) | 2009-05-06 | 2009-05-06 | Method for microwave drying of sodium chloride |
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| Publication Number | Publication Date |
|---|---|
| CN101544383A CN101544383A (en) | 2009-09-30 |
| CN101544383B true CN101544383B (en) | 2011-01-05 |
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|---|---|---|---|
| CN2009100944356A Expired - Fee Related CN101544383B (en) | 2009-05-06 | 2009-05-06 | Method for microwave drying of sodium chloride |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538404A (en) * | 2012-01-17 | 2012-07-04 | 锡矿山闪星锑业有限责任公司 | Microwave drying method for wet monohydrate zinc sulfate product |
| CN102538435B (en) * | 2012-02-09 | 2014-08-13 | 机械科学研究总院先进制造技术研究中心 | Equipment for drying gypsum boards |
| CN103234339B (en) * | 2013-05-02 | 2015-06-03 | 昆明理工大学 | Device for ilmenite concentrate microwave drying and application method thereof |
| CN104628015B (en) * | 2013-11-08 | 2018-02-13 | 中核四○四有限公司 | A kind of drying pretreating process of fused salt |
| CN105605884B (en) * | 2016-03-02 | 2018-08-28 | 北京富海天环保科技有限公司 | A kind of drying equipment and method of sodium sulfocyanate |
| CN107192245A (en) * | 2017-06-22 | 2017-09-22 | 宁夏塞上阳光太阳能有限公司 | Automatic continuous dryer |
| CN110064482B (en) * | 2019-05-23 | 2021-01-26 | 南通大学 | Method for crushing waste concrete with different strengths by microwave assistance |
| CN115340893B (en) * | 2021-05-14 | 2023-08-29 | 蓝天众成环保工程有限公司 | Sludge recycling treatment method |
| CN116007335A (en) * | 2022-12-22 | 2023-04-25 | 天津海光药业股份有限公司 | Medicinal sodium bicarbonate drying system, method and application |
| CN117469954B (en) * | 2023-12-21 | 2024-03-26 | 潍坊鲁创机械设计有限公司 | Drying method for feed preparation |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2539115Y (en) * | 2002-05-15 | 2003-03-05 | 中国石油化工股份有限公司 | Continuous microwave drier |
| CN1995883A (en) * | 2006-01-05 | 2007-07-11 | 卓卫民 | Microwave heating device driven by metal chain |
-
2009
- 2009-05-06 CN CN2009100944356A patent/CN101544383B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2539115Y (en) * | 2002-05-15 | 2003-03-05 | 中国石油化工股份有限公司 | Continuous microwave drier |
| CN1995883A (en) * | 2006-01-05 | 2007-07-11 | 卓卫民 | Microwave heating device driven by metal chain |
Non-Patent Citations (2)
| Title |
|---|
| JP平4-32688A 1992.02.04 |
| JP特开平7-280433A 1995.10.27 |
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| CN101544383A (en) | 2009-09-30 |
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