KR20160073665A - Drying system and drying method for high water content materials - Google Patents

Abstract

According to the present invention, a system for drying a high water content material comprises: a heat source supply unit to supply a heat source generated by a boiler which combusts fuel; a heating medium supply unit to store oil which is a heating medium, and supply the oil; a heating unit to heat the heating medium by the heat source supply unit; an evaporation drying unit to dry a material to be dried, which is supplied from the outside while immersing the material to be dried in the heated heating medium to discharge the material to be dried; a collecting unit to collect evaporation gas including steam, foul odor gas, and oil droplets produced while drying the material to be dried in the evaporation drying unit; a compressor to adiabatically compress the steam in the evaporation gas; a heat exchanger to use the steam adiabatically compressed by the compressor to heat the heating medium discharged from the evaporation drying unit; a circulation pipe to supply the heating medium discharged from the evaporation drying unit to the heat exchanger, and supply the heating medium heated by the heat exchanger to the evaporation drying unit; a condenser to condense the steam included in the evaporation gas produced during a drying process in the evaporation drying unit to discharge the steam as condensate; a solid/liquid separator to separate oil from the material to be dried, which is dried and discharged from the evaporation drying unit to discharge the material to be dried and the oil; a foul odor gas transport unit to supply the foul odor gas to the heat source unit to combust the foul odor gas after discharging the condensate; and an oil droplet separation unit to separate the oil droplets contained in the discharged condensate. The present invention dries a high water content material which is a material to be dried while maintaining the high water content material in a condition where the high water content material is immersed in oil which is an indirectly heated heating medium. The evaporation drying unit, the collecting unit, etc. are sealed systems to prevent foul odor gas or the like from being discharged to the outside.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high-

The present invention relates to a high-function material drying system and a high-function material drying method, and more particularly, to a high-function material drying system for drying a high-function material, which is an externally supplied drying target, And a method for drying a high-function material.

Generally, a method of drying a substance containing moisture is a direct heating drying method or an indirect heating drying method.

The direct heating drying method is a method of directly heating and drying a high temperature heating medium such as a high temperature combustion gas or air and a drying target material by direct contact. In the indirect heating drying method, a heating medium such as high temperature steam or gas is indirectly contacted Heating, and drying. Among them, the direct heating drying method is used to dry a material having a relatively high water content (hereinafter referred to as a 'high moisture material') or to rapidly dry a material having a low water content. Indirect heating and drying methods are mainly used when the material of the building is damaged by thermal contact or the property is altered.

High moisture content such as sewage sludge, wastewater sludge, food waste, and livestock manure has a high water content, and when it is dried using a direct heating and drying method, a large amount of odorous substances are generated, which is difficult to treat. Further, since the drying target material is agglomerated or the drying target material itself has a low water content, it has a high adhesive strength that rapidly coalesces with the drying target material.

When the above-mentioned high-function material is dried by the indirect heating and drying method, the drying object is adhered to the inner wall surface of the drying apparatus to make it difficult to operate the apparatus, and the drying time becomes very long, more than 1 hour, There is a lot of problems with this.

Prior art to the present invention may be exemplified by the publication No. 2012-0050819.

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the above-mentioned problems, and it is a principal object of the present invention to provide a method for indirectly heating and drying a high functional material which is a subject to be dried by being kept in an oil- And a method for drying a high-boiling matter material, which is capable of drying the boiling heat-transferring method in which water is evaporated as the boiling water is evaporated.

In addition, the present invention separates water vapor and odorous substances generated in the drying process of the material to be dried into condensate and gas in the condenser, and directly burns and treats the material in a combustion apparatus that produces a high-temperature heat source, System and a method for drying a high-function material.

According to an aspect of the present invention, there is provided a fuel cell system including: a heat source supply unit for supplying a heat source generated by a boiler for burning fuel; A heating medium supply unit for storing and supplying the oil as the heating medium; A heating unit for heating the heating medium by the heat source; An evaporating and drying unit for drying and discharging the drying target material supplied from the outside in a state of being immersed in the heated heating medium; A collecting unit for collecting evaporative gas including water vapor, odor gas and oil droplets generated during drying in the evaporating and drying unit; A compressor for adiabatically compressing water vapor in the evaporation gas; A heat exchanger for heating the heat medium discharged from the evaporation and drying unit by using the steam adiabatically compressed in the compressor; A circulation pipe for supplying the heating medium discharged from the evaporating and drying unit to the heat exchanger and supplying the heating medium heated by the heat exchanger to the evaporating and drying unit; A condenser for condensing the water vapor contained in the evaporation gas generated during the drying process in the evaporation and drying unit and discharging it as condensed water; A solid-liquid separator for separating and discharging oil from the drying target material which is dried and discharged in the evaporating and drying unit; A malodorous gas transfer unit for supplying the malodorous gas to the heat source supply unit and burning the molten gas after discharging the condensed water; And a oil droplet separator for separating the oil droplets contained in the discharged condensed water.

The heating medium supply unit, the evaporation and drying unit, and the collecting unit are closed, so that the increase of odor and water generated in the evaporation and drying unit may not be discharged to the outside.

The heat source supply unit may supply steam by generating steam at 120 to 250 ° C or combustion gas at 300 to 1,500 ° C.

The heating unit may heat the heating medium to 110 to 200 ° C.

The moisture content of the drying target material may be 30 to 99% by weight.

The evaporation and drying unit may include a drying unit body having a space formed therein and storing the heating medium supplied from the heating medium supply unit, and a drying unit unit configured to mix the drying target material and the heating medium supplied to the drying unit main body, And a discharging means for discharging the drying target material, which is moved by the mixing means, to the outside.

The feeding means may be a bucket belt conveyor in which a plurality of buckets are spaced apart along the belt.

The internal pressure of the drying unit main body may be 0.9 to 2 bar (absolute pressure).

The heating medium stored in the drying unit main body may be 2 to 50 times the drying target material.

The oil recovery unit may be of the centrifugal separation type.

According to an aspect of the present invention, there is provided a method for heating a combustion apparatus, the method comprising: supplying steam or combustion gas generated from a combustion apparatus to oil, Supplying a high-function material as a drying target material to the heated heating medium and drying the same; Collecting and separating water vapor, odor gas, and oil droplets generated during the drying step; And separating the oil from the drying target material that is dried and discharged in the drying step, wherein the drying is performed by moving and holding the drying target material in a state of being immersed in the heating medium, ≪ / RTI >

The heating medium may be heated to 110 to 200 ° C.

The drying may be performed by mixing the drying target material and the heating medium.

The step of separating the oil may be performed by centrifugation.

The step of collecting and separating the steam, the malodor gas, and the oil droplet includes separating and discharging the collected steam, collecting and discharging the trapped malodor gas to the combustion apparatus, And separating the oil droplets from the condensed water.

In the present invention as described above, the high functional material, which is a drying target material, can be kept in a state of being immersed in oil, which is a heating medium, to be dried.

In addition, the present invention can solve the odor problem by directly burning and treating the steam and the odorous substance generated in the drying process of the material to be dried in the condenser by condensing water and gas and directly burning it in a combustion device producing a high-temperature heat source.

1 is a view showing a configuration of a high-function material drying system according to an embodiment of the present invention.
Fig. 2 is a flow chart showing the construction of the high-function material drying method according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a configuration of a high-function material drying system according to an embodiment of the present invention.

1, a high-function material drying system 100 according to an embodiment of the present invention includes a heat source supply unit 110, a heating medium supply unit 120, a heating unit 130, an evaporation and drying unit 140, A condenser 190, an oil droplet separator 192, an odor gas transfer unit 194, and a solid-liquid separator 200. The compressor 150, the compressor 160, the heat exchanger 170, the circulation pipe 180,

Fig. 2 is a flow chart showing the construction of the high-function material drying method according to the present invention.

Referring to FIG. 2, the method for drying a high-function material according to the present invention includes a heating step (S110), a drying step (S120), a step of collecting and separating water vapor, odor gas and oil droplets (S130) (S140).

The components shown in Figs. 1 and 2 will be described together.

In the heating step (S110), the heating medium, which is a heating medium used for drying the drying target material, is heated to a predetermined temperature as a heating medium. To this end, a heat source supply unit 110, a heating medium supply unit 120, and a heating unit 130 are used.

The heat source supply unit 110 operates a boiler for burning a fuel such as oil or gas to supply water vapor or combustion gas having a predetermined temperature. The temperature of the steam supplied from the heat source supply unit 110 is preferably 120 to 250 ° C. The temperature of the combustion gas supplied from the heat source supply unit 110 is preferably 300 to 1500 ° C.

Since the construction of the boiler is a well-known technology, a detailed description thereof will be omitted.

The heating medium supply unit 120 has a predetermined space therein, stores oil as a heating medium in the space, and supplies oil as a heating medium according to the user's needs.

Here, the oil used as the heating medium includes animal oil, vegetable oil, refined waste oil and petroleum oil.

The heating unit 130 heats oil, which is a heating medium supplied from the heating medium supply unit 120, using steam or combustion gas, which is a heat source supplied from the heat source supply unit 110. The heating temperature in the heating unit 130 is preferably 110 to 200 ° C.

The drying step (S120) is a step of receiving and drying the high-function material, which is a drying target material, from the outside, and is performed while moving the high-function material in a state of being immersed in the heating medium.

The drying step (S120) uses the evaporation drying unit (140).

The evaporation and drying unit 140 receives the high-function material, which is a drying target material, from the outside, and injects it into the heating unit 130 as oil, which is a heating medium, to perform drying. Here, the drying target material to be supplied to the evaporation and drying unit 140 is a material having a moisture content of 30 to 99% by weight and includes sewage sludge, wastewater sludge, food waste, livestock manure, and the like.

The evaporation and drying unit 140 includes a drying unit main body 142, mixing means 144 and discharge means 146.

The drying unit main body 142 receives the heating medium heated by the heating unit 130, stores the heated heating medium therein, and can dry the high-function material as a drying target material. Here, the amount of the heating medium stored in the drying unit main body 142 may be 2 to 50 times the amount of the drying target material supplied from the outside.

The drying unit main body 142 may have a predetermined space and may be in the form of a closed hexahedron, but may be formed in various shapes according to the needs of the user. At both ends of the drying unit main body 142, there are formed an inlet port 141a through which the drying target material flows and a discharge port 141b through which the dried drying target material is discharged.

The heating medium stored in the drying unit main body 142 can be circulated to the heating unit 130 according to the temperature drop. The connecting portion between the drying unit main body 142 and the heating unit 130 may be adjacent to the inlet 141a.

The inner pressure of the drying unit main body 142 is preferably 0.9 to 2 bar (absolute pressure) while the drying unit main body 142 is drying.

The mixing means 144 is disposed inside the drying unit main body 142 to mix the drying target material supplied from the outside with the heating medium. The mixing means 144 moves the material to be dried, which is supplied from the outside, from the inlet 141a side to the outlet 141b side so as to be stacked on the loading space 145.

Here, when the object to be dried is dried under the condition that it is immersed in the heating medium oil, the heat transfer rate is 500 W / m ² . In addition, the time period for which the drying target material supplied from the outside is immersed in the heating medium and dried and discharged is 4 to 30 minutes.

The mixing means 144 comprises a conveyor belt having a predetermined length. Various mechanisms can be used as the mixing means 144 as long as the drying target material and the heating medium are mixed and can be moved toward the discharge port 141b side.

The drying object main body 142 may be detached from the mixing means 144 while being mixed with the heating medium by the mixing means 144 so as to fall down to the lower portion of the drying portion main body 142, In the present invention.

The drying target material mixed with the heating medium is heat-exchanged with the heating medium oil, so that the moisture content of the drying target material is 2 to 20% by weight.

The discharging means 146 is a means for improving the energy efficiency by preventing the energy in the evaporating and drying unit 140 from leaking in the process of discharging the dried solids to the outside. One example of such a discharge means 146 is a screw conveyor for discharging dried solids through a shaft having a spiral wing formed therein.

Although one end of the discharging means 146 is disposed on the loading space 145 to discharge the drying target material to the outside, the discharging means 146 may have one end of the discharging means 146, May be directly connected to the end of the drying target material 144 and mixed by the mixing means 144, and the transferred drying target material may be immediately transferred to the outside.

On the other hand, during drying, evaporative gas containing various components contained in the substance to be dried is generated.

That is, in the drying step (S120), water vapor, odor gas and oil droplets are generated in the drying target material. In order to improve the drying efficiency, a step S130 of collecting and separating the evaporated gas including water vapor, odor gas and oil droplet is performed. For this purpose, a collecting unit 150, a heat exchanger 170, a circulation pipe 180, and a condenser 190 are used.

The collecting unit 150 is disposed on the upper part of the drying unit main body 142 and collects evaporative gas including water vapor, odor gas and oil droplet generated during drying of the drying target material in the drying unit main body 142 S131) and supplies it to the compressor 160, which will be described later.

The collecting part 150 may have an inverted triangular cross-sectional shape to facilitate collection of the evaporative gas.

The heat medium supply part 120 and the collecting part 150 are closed to prevent evaporation gas and oil droplets from being generated from the solid material and the solid material inside. Further, the evaporation and drying unit 140 is also configured to be hermetically sealed so that odor gas and water vapor are not discharged to the outside.

The compressor 160 is a means for compressing the evaporated gas in the collecting part 150. The compressor 120 may be reciprocating, centrifugal, or the like. More specifically, it may be a screw type, a wing type oil-free type, or a rocking type oil-free type.

When the evaporator is compressively adiabatically pressurized to 2 to 10 bar (absolute pressure) using the compressor 160, the water vapor of the evaporated gas becomes saturated water vapor and the temperature rises to 120 to 190 ° C. Therefore, when the latent heat of the adiabatically compressed saturated steam is used to heat the heating medium (the heating medium whose temperature is lowered in contact with the dried high-moisture product) discharged from the evaporation drying unit 140, the energy consumption used in the drying process of the high- Can be minimized. When the latent heat of saturated steam, which is adiabatically compressed water vapor, is used, it is possible to drive the drying system by only 250 ~ 400 ㎉ / kg steam, which is 30 ~ 60% of the energy consumed in the conventional drying system, .

The heat exchanger 170 is connected to the evaporation and drying unit 140 through the circulation pipe 180. In this heat exchanger 170, heat exchange is performed between the heating medium discharged from the evaporation and drying unit 140 (the heating medium whose temperature is lowered in contact with the dry matter of the high moisture content) and the saturated steam of high temperature adiabatically compressed in the compressor 160. The heating medium heated in the heat exchanger 170 is supplied again to the evaporation and drying unit 140 through the circulation pipe 180 to be used for drying the high-moisture dry matter. Further, the water vapor used to heat the heating medium is condensed in the condenser 190 to be discharged into the outside.

At this time, a circulation pump 172 for circulating the heating medium is installed on the circulation pipe 180. If the amount of the heating medium filled in the evaporation and drying unit 140 is insufficient, the heating medium auxiliary tank 202 for supplying the heating medium is connected to the circulation pipe 180. In this embodiment, the heating medium auxiliary tank 202 is used, but the heating medium supplying unit 110 may be connected to the circulation pipe 180.

Meanwhile, the discharge means 146 of the evaporation and drying unit 140 is connected to the solid-liquid separator 200 described later.

The condenser 190 performs cooling at a predetermined temperature with respect to the evaporation gas including water vapor, odor gas, and oil droplets generated during drying of the drying object material in the drying unit main body 142. The condensed water vapor condensed by cooling is discharged as condensed water. When the condensed water is generated, the condensed water may contain oil droplets (S132).

The condenser (190) is connected to the oil droplet separator (192) and the odor gas conveyor (194).

The oil droplet separator 192 separates the oil droplets contained in the condensed water from the condensed water and discharges them. The discharged oil droplets can be recycled to the heating medium supply unit 120 as needed (S133). Also, the condensed water can be recycled through a predetermined wastewater treatment process.

The odor gas transfer unit 194 transfers the odor gas remaining after the condensed water is deflated in the steam separator 154 to the boiler of the heat source supply unit 110 serving as the combustion apparatus. The malodor gas transferred to the boiler is burned and removed (S134).

The malodor gas transfer part 194 may include a predetermined induction blower. The manned blower facilitates the transfer of odor gas to the boiler.

Since the oil content of the dried material discharged from the drying unit main body 142 is 15 to 30% by weight, it is necessary to separate the oil from the dry material.

The step of separating the oil (S140) separates the oil, which is a heating medium contained in the dried solid material discharged from the evaporation and drying unit (140). For this, a solid-liquid separator 200 is used.

The solid-liquid separator 200 is a centrifugal separator for separating and removing the heat medium contained in the dried and discharged solid matter in the evaporation and drying unit 140, and separating the heat medium by centrifugal force. The heating medium separated and removed in the solid-liquid separator 200 is supplied to the evaporation and drying unit 140 through the circulation pipe 180 when the heating medium is insufficient after being stored in the heating medium auxiliary tank 202.

Here, the solid-liquid separator 200 can use a centrifugal separator. The separated oil can be supplied to the heating medium auxiliary tank 202 and reused.

In the present invention, a high-function material, which is a drying target material, is kept in a state of being immersed in oil, which is indirectly heated heat medium, so that drying can be performed. These evaporation drying units, collecting units, The structure is not discharged to

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: High moisture material drying system
110: heat source supply unit 120: heating medium supply unit
130: heating section 140: evaporating drying section
150: collecting section 160: compressor
170: Heat exchanger 180: Circulation piping
190: condenser 200: solid-liquid separator

Claims (15)

A heat source supply unit for supplying a heat source generated by a boiler for burning fuel;
A heating medium supply unit for storing and supplying the oil as the heating medium;
A heating unit for heating the heating medium by the heat source supply unit;
An evaporating and drying unit for drying and discharging the drying target material supplied from the outside in a state of being immersed in the heated heating medium;
A collecting unit for collecting evaporative gas including water vapor, odor gas and oil droplets generated during drying in the evaporating and drying unit;
A compressor for adiabatically compressing water vapor in the evaporation gas;
A heat exchanger for heating the heat medium discharged from the evaporation and drying unit by using the steam adiabatically compressed in the compressor;
A circulation pipe for supplying the heating medium discharged from the evaporating and drying unit to the heat exchanger and supplying the heating medium heated by the heat exchanger to the evaporating and drying unit;
A condenser for condensing the water vapor contained in the evaporation gas generated during the drying process in the evaporation and drying unit and discharging it as condensed water;
A solid-liquid separator for separating and discharging oil from the drying target material which is dried and discharged in the evaporating and drying unit;
A malodorous gas transfer unit for supplying the malodorous gas to the heat source supply unit and burning the molten gas after discharging the condensed water; And
And a oil droplet separator for separating the oil droplets contained in the discharged condensed water. The method according to claim 1,
Wherein the heating medium supply part, the evaporation drying part, and the collecting part are hermetically closed so that an increase in odor and water generated in the evaporation and drying part is not discharged to the outside. The method according to claim 1,
The heat source supply unit
A high-boiling substance drying system that generates and supplies water vapor of 120 to 250 ° C or combustion gas of 300 to 1,500 ° C. The method according to claim 1 or 3,
Wherein the heating unit heats the heating medium to 110-200 ° C. The method according to claim 1,
Wherein the moisture content of the drying target material is 30 to 99 wt%. The method according to claim 1,
The evaporation /
A drying unit main body in which a space is formed inside the space and in which the heating medium supplied from the heating medium supply unit is stored,
Mixing means for mixing and moving the drying target material supplied to the drying unit main body and the heating medium,
And discharging means for discharging the drying target material while being moved by the mixing means to the outside. The method according to claim 6,
Wherein the feeding means is a bucket belt conveyor in which a plurality of buckets are spaced apart along the belt. The method according to claim 6,
Wherein the internal pressure of the drying unit body is 0.9 to 2 bar (absolute pressure). The method according to claim 6,
Wherein the heating medium stored in the drying unit main body is 2 to 50 times the drying target material. The method according to claim 1,
Wherein the oil recovery unit is a centrifugal type. Supplying steam or combustion gas generated from the combustion apparatus to oil as a heating medium and heating the steam;
Supplying a high-function material as a drying target material to the heated heating medium to move the drying target material in a state of being immersed in the heating medium, and moving the drying target material;
Collecting and separating the evaporated gas generated during the drying step; And
And separating the oil from the drying target material dried and discharged in the drying step. 12. The method of claim 11,
Wherein the heating medium is heated to 110 to 200 占 폚. 12. The method of claim 11,
Wherein the drying step is performed by mixing the drying target material and the heating medium. 12. The method of claim 11,
Wherein the step of separating the oil is performed by centrifugation. 12. The method of claim 11,
The step of collecting and separating the water vapor, odor gas,
Separating and discharging the collected water vapor,
Transferring the collected odor gas to the combustion device, burning and removing the same,
And separating the oil droplets from the condensed water.

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