KR101931379B1 - Apparatus for drying peat - Google Patents

Abstract

In this invention, the granules and the fine particles are separated in a short time at a low temperature of 150 ° C or lower in the drying apparatus, the granules can be dried with hot air, the fine particles can be dried quickly with a microwave heat source, In order to use the pulverized coal as fuel for the coal-fired power plant, the peat having a moisture content of 40 to 60% is separated into the granulated powder and the fine powder in the drying apparatus, the granulated powder is subjected to hot air drying and the fine powder is heated with a microwave heat source Which is lower than the conventional 400 ° C by 250 ° C or lower and less than or equal to 150 ° C to satisfy the condition as a mixed fuel of a coal-fired power plant,
A highly concentrated peat supply unit composed of a high-concentrated peat storage tank, a rotary feeder, and a diaphragm; A vibrating drying device having a high peat peat input port, a heated air inlet port, a dry peat discharge port, a vibration lowering device lower spring, a vibration supply device, and a vibrating device support; A pressure gauge for measuring the pressure of the outside air, a regulating flow meter for regulating the amount of outside air, a heat exchanger for heat recovery of the dried peat, and a heat exchanger for drying the peat and heat exchanged air An air heater for heating the air, an atmospheric air bypass valve to be used for circulating air, and a temperature measuring unit for controlling the temperature of the heated injection air; A rotary feeder connected to the heat exchanger, and a dry peat storage tank; A vapor sucking unit attached to an upper part of the vibrating and drying device and sucking the decomposed steam during the drying process of the high-moisture peat, a decomposed vapor condenser for condensing the sucked vapor-phase air, a gas-liquid separator for separating the gas in the condensed condensed water, A condensate reservoir for storing condensate discharged from the gas-liquid separator, and a condenser for circulating the condensed water to the cooling water.

Description

[0001] Apparatus for drying peat [0003]

The present invention relates to a drying device for the granularity of high-moisture peat. More specifically, the granulated powder and the granular powder are separated in a short time in a drying device at a low temperature of 150 ° C or less for about 30 minutes, , And the fine particles can be quickly dried with a microwave heat source. In order to use the high-moisture coal as a fuel for a coal-fired power plant, the peat having a moisture content of 40 to 60% is separated into a granulated powder and a fine powder in a drying apparatus, And the fine particles are heated to a temperature of 150 ° C or lower, which is 250 ° C or lower than that of the conventional 400 ° C, by heating with a microwave heat source. Thus, the particle size of a high- Drying apparatus.

When coal is classified according to the degree of carbonization, it is classified into anthracite with a degree of carbonization of 90% or more, bituminous coal with 80 to 90%, lignite having 70 to 80% and peat having a degree of 70% or less, It is divided into brown coal, lignite, sub-bituminous coal, bituminous coal and anthracite. The bituminous coal is further divided into low volatile matter, medium volatile matter, high volatile bituminous coal, Anthracite is divided into semi-anthracite, anthracite, meta-anthracite and black anthracite. Among these, low grade coal (LRC) refers to brown coal to sub-bituminous coal, and from bituminous coal it is classified as high grade coal (HRC).

The amount of imported coal such as bituminous coal used in power plants is about 500 billion tons, and peat has a similar amount to imported coal. Therefore, the conversion of power generation through the drying of peat is indispensable for diversification of power generation fuel.

The peat is deposited 5,000-10,000 years ago in a marshy swamp area such as mosses, reeds, and shoots, such as ferns and plants, pine trees and birch, in a cold, swampy lake basin, and is biochemically changed by fungi in the presence of water. , Which is composed of 30% or more of sediment organic matter, 40 ~ 60% of moisture and calorific value 3,500 ~ 6,500 kcal / kg. Unlike coal, which is buried underground, lignin and cellulose, which are the main components of the plant, are mainly produced by the decomposition of the surface, unlike the wood, which has been produced by acupressure and geothermal action for a long time. It is not enough to be used as fuel. Therefore, it is necessary to increase the content of hydrogen and carbon components relatively through the drying of water which occupies about 40 to 60% of the peat.

Water in the peat can be divided into free water, interstitial water, surface water, and bound water. A large portion of the peat water occupies a free water adhered to the surface of the peat, and water present between the peat molecule and the molecule is internal water, and the number of bonds is chemically bonded to the lower coal molecule. The free water and surface water are dried at 100 ± 5 ° C, but the internal water and the combined water are destroyed and dried at about 400 ° C. Therefore, they must be dried for at least one hour at a temperature of at least 400 ° C, Combined water and internal retained water are decomposed and dried. However, it is difficult to keep the high temperature up to the inside of the low grade coal by the conventional drying method.

Conventional techniques for drying and stabilizing highly concentrated coal include a method of drying by heating at a temperature of 400 ° C or more for 1 hour, or a method of drying in oil.

The oil drying method includes a slurry dewatering step of dewatering the pulverized low grade coal in oil, an oil recovery step of subjecting the dewatered slurry to solid-liquid separation by centrifugation, a drying step of heating and recovering the oil remaining in the separated solid matter, And a molding process for molding the modified powder in the form of a dry powder.

However, in the above-mentioned in-oil drying method, the kerosene component (oil band) added to the process remains in the dry coal, and acts as a cause of increase in power and failure of the coal fired power plant differentiator. In the coal fired power plant, And the particles of the coal powder and the combustion locus are different, the oil band is not burned and the oil band and the fine soot are discharged, which lowers the dust collecting characteristics of the electrostatic precipitator, and the oil band remaining in the collected coal fly ash There is a problem that acts as an obstacle to recycling.

On the other hand, Korean Patent No. 10-0960793 entitled " Method and Apparatus for High-grade Coal Coal "discloses that raw coal having a particle size of 30 to 50 mm is ground to a particle size of 10 to 30 mm during coal mining based on low grade lignite and bituminous coal, A technique of blocking the pores of dry coal by using microwave irradiation and adding heavy oil powder to the low-grade coal having a content of 30% or more and using hydrophobic in heavy oil.

However, when this process technology is applied to the drying of the high peat peat, the peat is carbonized in the rivers and the like, and since the surface of the peat is hydrophilic, the heavy oil does not show any effect on moisture drying, There is a problem in that it is advantageous for free water drying on the surface of the agglomerated peat but is ineffective for drying the particulate bond water. High-grade low-grade coal has a long carbonization period and is crushed to 10-50mm in length. It is used for storage and combustion in coal-fired power plant. However, peat has a characteristic of distributing fine grains up to 25mm in the form of soil I have.

Therefore, in the case of the conventional method of drying at a high temperature and a high temperature of 400 ° C. or more, the burning fuel value is lowered due to the devolatilization of volatile components during the drying process, the unnecessary heat consumption is large in the drying process, and additives such as heavy oil and asphaltene are used In the case of evaporation in the air, the process is very complicated and heavy oil residues are present in the dry coal, which causes problems such as deterioration of dust collecting characteristics of the electrostatic precipitator and inability to recycle fly ash by forming oil bands in the combustion by-products (fly ash)

DISCLOSURE OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a method for separating granular components and minute particles in a short time of about 30 minutes at a low temperature of 150 ° C or lower, , And the fine particles are capable of rapidly drying with a microwave heat source.

Another object of the present invention is to separate peat having a moisture content of 40 to 60% into a granulated powder and a fine powder in a drying apparatus in order to use a high-moisture coal as fuel for a coal-fired power plant, And the fine particles are dried at a temperature of 150 ° C or lower, which is 250 ° C lower than the conventional 400 ° C, by heating with a microwave heat source to provide a granular drying device of a high water content I have to.

In order to achieve the above-mentioned object, the present invention provides a high-density peat-to-peer feeder comprising a high-moisture peat storage tank, a rotary feeder, and a diaphragm; A vibrating drying device having a high peat peat input port, a heated air inlet port, a dry peat discharge port, a vibration lowering device lower spring, a vibration supply device, and a vibrating device support; A pressure gauge for measuring the pressure of the outside air, a regulating flow meter for regulating the amount of outside air, a heat exchanger for heat recovery of the dried peat, and a heat exchanger for drying the peat and heat exchanged air An air heater for heating the air, an atmospheric air bypass valve to be used for circulating air, and a temperature measuring unit for controlling the temperature of the heated injection air; A rotary feeder connected to the heat exchanger, and a dry peat storage tank; A vapor sucking unit attached to an upper part of the vibrating and drying device and sucking the decomposed steam during the drying process of the high-moisture peat, a decomposed vapor condenser for condensing the sucked vapor-phase air, a gas-liquid separator for separating the gas in the condensed condensed water, , A condensate reservoir for storing condensate discharged from the gas-liquid separator, and a condenser for circulating the condensed water to the cooling water.

The constitution of this invention is characterized in that the above-mentioned fluidized bed perforated plate has a pore size of 8 mm x 8 mm, which is the boundary line between the granular component and the granular component in the particle size distribution of the peat, and the outlet for discharging the finally dried granular component, .

In the structure of the present invention, it is preferable that the material of the above-described fluidized-bed perforated plate is made of stainless steel (SUS310) in order to prevent abrasion.

The structure of the present invention is preferably such that the outside of the vibration drying device is made of aluminum oxide (Al 2 O 3) material in order to block leakage of microwaves.

The structure of the present invention is preferably such that the internal vibration flow plate is made of a Teflon material having a low permittivity for the purpose of transmitting the supplied microwave.

The constitution of the present invention is preferably such that the thermocouple thermometer for controlling the microwave output by measuring the temperature inside the fine particle coal to be dried in the microwave vibration drying apparatus is made of a stainless steel shielding material.

In the structure of the present invention, it is preferable that the microwave feeder is arranged so as to intersect without facing each other in order to prevent malfunctioning of the magnetron by inflow of the microwave and uniform Irradiation, and the thermocouple is disposed between the microwave supply units to which the microwave is not irradiated .

In the present invention, the granulated minerals and fine particles are separated by the granularity in the high peat peat drying apparatus, and the granular minerals are dried using heated air such as power plant waste heat and the fine granular peat is dried at a low temperature It is possible to dry quickly.

FIG. 1 is a graph showing mass distribution of particle size of peat.
2 is a heat loss curve of the high water and dry peat.
3 is a heat loss differential curve according to the heating temperature of the high-water-content peat according to the particle size.
4 is a graph showing the dry conversion ratio of the high-water-content peat by the particle size.
FIG. 5 is a configuration diagram of a drying apparatus according to an embodiment of the present invention.
FIG. 6 is a detailed view of a vibrating drying device of a drying device according to an embodiment of the present invention.
7 is a sectional view taken along the line AA in Fig.
FIG. 8 is a plan view of a fluidized bed perforated plate of a vibrating drying device of a drying device according to an embodiment of the present invention; FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention. Other objects, features, and operational advantages, including the purpose, operation, and effect of the present invention will become more apparent from the description of the preferred embodiments.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not to be construed as limiting the scope of the invention as disclosed in the accompanying claims. It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities, many of which are within the scope of the present invention.

Also, terms and words used in the description and claims of the present invention are defined based on the principle that the inventor can properly define the concept of a term in order to explain its invention in the best way, And should not be construed as limited to only the prior art, and should be construed in a meaning and concept consistent with the technical idea of the present invention. For example, the terms relating to directions are set on the basis of the position represented on the drawing for convenience of explanation.

FIG. 5 is a configuration diagram of a drying apparatus according to an embodiment of the present invention.

As shown in Fig. 5, the construction of the drying apparatus for each grain size of the high-water-content peat according to the embodiment of the present invention is characterized by comprising a high-water-concentration peat storage tank 1, a rotary feeder 2, Min. And the vibrating device support 24 are arranged in the same manner as the vibrating device support 24, the high-moisture peat input port 4, the heated air inlet 5, the dry peat discharge port 21, the oscillating flow device lower spring 22, A vibrating and drying device (20) provided with the vibrating device (20); (10) for injecting outside air, a pressure gauge (11) for measuring the pressure of outside air, a regulating flow meter (12) for regulating the amount of outside air, a heat exchanger (14) for heating the air exchanged with the peat with drying air, an atmospheric air bypass valve (15) used as recirculating air, a temperature control unit A heating air supply part composed of a measuring device 7; A peat recovery and storage unit comprising a rotary feeder 25 connected to the heat exchanger 13 and a dry peat storage tank 26; A steam suction part 8 attached to the upper part of the vibration drying device 20 for sucking the steam decomposed in the drying process of the high moisture condensate, a decomposition steam condenser 16 for condensing the sucked steam air, Liquid separator 17 for separating the gas in the condensed water, a condensed water storage tank 18 for storing condensed water descending from the gas-liquid separator 17, and a condensing portion for circulating the condensed water to the cooling water .

FIG. 6 is a detailed view of the vibrating drying device of the drying device according to an embodiment of the present invention, and FIG. 7 is a sectional view taken along line A-A of FIG.

6 and 7, the vibration drying device 20 of the drying device according to an embodiment of the present invention has a heating air inlet nozzle 5 2, a fluidized-bed perforated plate 20-1 is provided at the center, and an internal oscillating flow plate 20-5 is provided at a lower portion. And a thermocouple thermometer 20-4 for measuring the temperature is provided.

The outside of the vibrating and drying device 20 is made of aluminum oxide (Al 2 O 3) to block leakage of microwaves, and the flow-through porous blanks 20-1 for injecting heated air for surface water drying are made of stainless steel SUS310). The inner vibration flow plate 20-5 is made of a Teflon material having a low permittivity for the purpose of permeating the supplied microwave. The temperature of the inside of the fine particle to be dried in the microwave vibration dryer And the thermocouple thermometer 20-4 for controlling the microwave output by the measurement is made of a stainless steel shielding material.

The microwave supplier 20-3 prevents the magnetron malfunction due to the inflow of microwaves and arranges the microwaves in such a way that they cross each other without facing each other for uniform irradiation. The thermocouple 20-4 is disposed between the microwave feeders 20-3 where the microwave is not irradiated. All the inlet and outlet ports 20-8, such as the upper drying air outlet 8, are made of an aluminum material with high microwave permeation resistance to prevent microwave leakage.

8 is a plan structural view of a fluidized-bed perforated plate 20-1 of a vibrating drying device 20 of a drying device according to an embodiment of the present invention.

As shown in FIG. 8, the fluidized-bed perforated plate 20-1 of the vibrating drying device 20 of the drying apparatus according to an embodiment of the present invention has a particle size distribution (20-1-1) is 8mm x 8mm, which is the boundary line between the granules and the fine particles in the particle size distribution of the peat, based on the distribution of 32-50% And the discharge port 20-1-2 for discharging the finally dried granulated peat to maintain the diaphragm at the size. The material is made of stainless steel (SUS310) to prevent wear.

The operation of the drying device according to the embodiment of the present invention, which has the above-described structure, according to the particle size of the high-moisture agitated peat is as follows.

As shown in FIG. 1, in the case of high-moisture coal, the distribution of particle sizes is distributed within 0-25 mm, 32-50% is distributed as granules of 8 mm or more, and the rest is in a range of 74 to 8 mm. However, peat 1 (Peat 1) is often less than 74μm and more than 50% is also distributed.

As shown in FIG. 2, when the high-moisture peat was analyzed by a thermal drying curve in a nitrogen atmosphere, it was found that dehydration of free water occurred at a temperature of about 75 to 200 ° C., The drying reaction and the devolatilization reaction of some volatile components occur at the same time.

However, as shown in FIG. 3, when the peat is separated by the particle size and dried, the dried peat having a size of 8 mm or more is mostly dried in a low temperature range of 200 ° C or less, And the remaining part is mostly dried at a high temperature range of 200 to 500 ° C. As a result, it is considered that only the number of the surface is present due to the large pore size and granularity in the case of granulated powder. It was found that there was pore water and drying was difficult.

As shown in Fig. 4, the activation energy and the drying rate constant required for the drying of the high-moisture coal slurry by using the dry conversion rate curve for each high-water-content peat particle size were calculated as shown in Table 1 below.

Kinds Activation energy
(kJ / mol) Drying rate constant
(s-1) R ² Rough peat
(raw peat) 26.3410 31,183 0.994 8mm or less peat
(fine peat) 39.1028 2,308 0.993 8mm or more peat
(coarse peat) 11.2491 62,712 0.978

As shown in Table 1, the activation energy of peat of 8 mm or less is highest and the drying rate is very low in the case of the high-hydrate peat. In the case of the peat of 8 mm or more, the activation energy is also lowered and the burning speed is greatly increased. In the case of the min. Peat, it was proper to separate the granularity and dry the granulated material with hot air, and to supply the strong energy source such as microwave, and to dry the granular material at low temperature rapidly.

Therefore, based on the particle size distribution of the high-moisture agglomerates, the dry activation energy and the drying rate of each grain size, the high-moisture coal peat is put into the drying apparatus and the granulated powder is subjected to hot air drying by particle size after the grain size separation, To make it possible to dry at high speed.

In order to accomplish this, in order to dry a highly concentrated peat having a moisture content of 30% or more with a peat for combustion combustion of coal having a moisture content of 10% or less, the microparticles separated through the particle separating vibrator are heated by a microwave heat source The degradable water such as the pore water, the capillary coupling water, the inner holding water and the like which is decomposed and dried at a temperature of 400 ° C or higher is dried at a temperature of 150 ° C or less in a short time and the remaining granular material which does not pass through the vibrating body, The hot air is injected and dried efficiently.

First, the heated water inlet 5 for drying the surface water is kept at a temperature of 120 to 150 ° C. to prevent the condensation of the steam evaporated during the drying of the surface water through the injection of the heated air, and the upper heated air injection nozzle 20-2), a certain amount of air at 100 to 130 ° C should be flown to prevent condensation of evaporated air.

Secondly, in the case of particulate level coal with surface water removed, the microwave powder is continuously irradiated with microwaves until the temperature of the mixture reaches 120 ~ 150 ° C. When the internal temperature of the mixture reaches about 120 to 150 ° C, the microwave irradiation is automatically stopped.

<Examples>

Two microwave feeders (2.45 GHz, 2 kW, 220 V, single phase, two vibration feeders (23) of 0.45 kW capacity are attached on both sides in order to uniformly oscillate the vibrating fluidized bed body. The volume of the vibrating body is 200 cm, the width is 30 cm, and the height of the drying apparatus of the vibrating fluidized bed is 30 cm. The thermometer 20-4 uses a stainless steel shielded thermocouple, The area of the high-purity peat pouring inlet 8 and the high-pit peat inlet 4 is 2 inches × 2 inches, the diameter of the thermometer 20-4 is 1 cm, 20-1-1) was installed at an interval of 4 mm on the horizontal and vertical axes with a size of 8 mm.times.8 mm on the basis of the peat particle size, and the granulation outlet 20-1-2 was provided at the end of the fluidized- 25 cm x 195 cm.

The experimental conditions are as follows.

◇ Peat: 1 Russian, ◇ Total moisture content: 42.5%

◇ Peat size: 0 ~ 25mm, ◇ Peat density: 0.4g / cm3

◇ Drying method of granulation: Heating air contact with perforated plate

◇ Drying temperature of granules: 100 ~ 130 ℃

◇ Dry air injection rate of granulation: 1 ~ 2m / s

◇ Amount of air injected for heating and drying: 0.18 ~ 0.36㎥ / min

◇ Injection amount of upper heating air for prevention of condensation and upper circulation: 0.54 ~ 0.72㎥ / min

◇ Fine powder drying method: microwave irradiation and molecular rotation

◇ Drying temperature of fine powder: 120 ~ 150

◇ Drying time of fine powder: 5 ~ 20 minutes

◇ High throughput peat throughput: 20kg / hr

Table 2 shows the physical properties of the granules and the fine particles prepared through the drying of the high-moisture peat and the granules used in the experiment.

peat Feedstock Dry-peat microparticulate Dry peat granulate moisture(%) 42.5 8.72 8.70 time(%) 3.0 2.69 2.98 Volatile matter (%) 38.38 61.47 60.83 Fixed carbon (%) 16.12 27.13 27.50 Fuel cost
(Fixed carbon / volatile matter) 0.42 0.44 0.45 Calorific value (Kcal / Kg) 4.253 5.840 5.810 C (%) 69.76 58.03 55.57 H (%) 4.82 6.14 5.85 N (%) 1.15 1.12 0.88 S (%) 0.12 0.14 0.12 O (%) 24.13 31.62 34.42 Particle size distribution 0 to 23 0 to 8 8-23

As shown in Table 2, the water content of high-moisture coal is 42.5% and the calorific value is 4,253 Kcal / kg as the dry weight, which is similar to anthracite coal and lower than coal for coal-fired power plants. The fuel ratio was 0.42. As a result of the dry test, the moisture content of dried peat was very low, 8.72% or less, and the calories were very high, more than 5,810 kcal / kg. In particular, it has a characteristic that the fuel cost greatly improves to 0.42 or more. The properties of Table 2 were found to be suitable as raw materials for combustion of coal-fired power plants.

The present invention is intended to dry a highly concentrated peat having a moisture content of 40% or more and a calorific value of 4,500 kcal / kg or less with coal for power generation of 10% or less and 5,500 kcal / kg or more.

Unlike coal tar (30 ~ 50mm), which has low carbonization and low carbonization, high purity peat is distributed in the range of 10μm ~ 25mm and distributed 30 ~ 50% in 8mm (particle size passing through the fluidized bed power plant) . &Lt; / RTI &gt; The drying characteristics of the peat according to the granularity are as low as 11.25 kJ / mol and the drying speed is 62,712 s-1, while the activation energy required for the drying of the granules of 8 mm or more is fast, while the activation energy required for drying is 39.10 kJ / mol And high drying rate of 2,308 s-1. As a result, it is technically and economically advantageous to apply high-purity peat raw material as a separate energy source after grain size separation.

1: High-concentrated peat storage tank 2: Rotary feeder
3: diaphragm 4: high-purity peat inlet
5: Heating air inlet 6: Upper heating air inlet
7: Temperature meter 8: Upper disassembled steam inlet
9: Disassembled steam transfer pump 10: External air injection blower
11: pressure gauge 12: air flow rate meter
13: heat exchanger 14: injection air heater
15: bypass valve 16: condenser
17: Gas-liquid separator 18: Condensate storage tank
19: circulation pump 20: drying chamber
21: peat discharge port 22: vibration flow device lower spring
23: Vibration supply device 24: Vibration device support
24: Rotary feeder 25: Dry peat storage tank

Claims (7)

A highly concentrated peat supply unit composed of a high-concentrated peat storage tank, a rotary feeder, and a diaphragm;
A vibrating drying device having a high peat peat input port, a heated air inlet port, a dry peat discharge port, a vibration lowering device lower spring, a vibration supply device, and a vibrating device support;
A pressure gauge for measuring the pressure of the outside air, a regulating flow meter for regulating the amount of outside air, a heat exchanger for heat recovery of the dried peat, and a heat exchanger for drying the peat and heat exchanged air An air heater for heating the air, an atmospheric air bypass valve to be used for circulating air, and a temperature measuring unit for controlling the temperature of the heated injection air;
A rotary feeder connected to the heat exchanger, and a dry peat storage tank;
A vapor sucking unit attached to an upper part of the vibrating and drying device and sucking the decomposed steam during the drying process of the high-moisture peat, a decomposed vapor condenser for condensing the sucked vapor-phase air, a gas-liquid separator for separating the gas in the condensed condensed water, , A condensate reservoir for storing condensate discharged from the gas-liquid separator, and a condenser for circulating the condensed water to the cooling water,
The above vibration drier unit
A fluidized-bed perforated plate for sorting the peat according to the size of pores into a granulated powder and a fine powder;
A heating air supply nozzle for applying the heating injection air to the granules selected by the fluidized bed perforated plate to perform drying; And
And a microwave supplier for applying microwaves to the fine particles selected by the fluidized bed perforated plate to perform drying. The method according to claim 1,
The above-mentioned fluidized bed perforated plate has a pore size of 8 mm.times.8 mm, which is the boundary line between the granular component and the granular component in the particle size distribution of the peat, and the discharge port for discharging the granulated granular final dried granulate, Drying device according to the particle size of the high-water-content peat The method according to claim 1,
Wherein the material of the fluidized-bed perforated plate is made of stainless steel (SUS310) in order to prevent abrasion, The method according to claim 1,
Wherein the outside of the vibration drying device is made of aluminum oxide (Al 2 O 3) to prevent leakage of microwaves. The method according to claim 1,
Wherein the vibration drier unit further comprises an internal vibration flow plate and the internal vibration flow plate is made of a Teflon material having a low permittivity for the purpose of transmitting the supplied microwave. Drying unit by size The method according to claim 1,
Characterized in that the thermocouple thermometer for controlling the microwave output by measuring the temperature inside the fine particle coal to be dried in the microwave vibration drying apparatus is made of a stainless steel shielding material. The method according to claim 1,
Characterized in that the microwave feeder is disposed between the microwave feeders which are not irradiated with the microwave, and the thermocouples are arranged between the microwave feeders which are not irradiated with the microwave, in order to prevent the malfunction of the magnetron due to the inflow of the microwaves and to cross them without facing each other for uniform irradiation. Drying unit by size

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