CN109293209B

CN109293209B - Dehumidifying and drying device

Info

Publication number: CN109293209B
Application number: CN201810401200.6A
Authority: CN
Inventors: 西川丰康; 信泽雄一郎; 佐藤稔
Original assignee: Nishihara Environment Co Ltd
Current assignee: Nishihara Environment Co Ltd
Priority date: 2017-07-25
Filing date: 2018-04-28
Publication date: 2021-05-07
Anticipated expiration: 2038-04-28
Also published as: JP2019027599A; JP6367439B1; CN113108555A; CN113108555B; CN109293209A

Abstract

The invention provides a dehumidifying dryer which can efficiently dry an object to be dried and obtain a dried object with stable quality even when the object to be dried is dried at a low temperature in order to suppress deterioration of the object to be dried and generation of odor. The dehumidifying and drying device comprises: a forming part (2) having a shaper (21) for shaping the object to be dried (K) into a cylindrical shape and a cutter (22) for cutting off the object to be dried (K) shaped into a cylindrical shape; and a drying section (3) having a loop conveyor (31), a dehumidifier (32), a heater (33), and a cover (34), wherein the loop conveyor (31) has a loop (311), receives the object to be dried (K) from the forming section (2), and conveys the object in a horizontal direction, the dehumidifier (32) removes the humidity of air, the heater (33) heats the air dehumidified by the dehumidifier (32) with warm water, and the cover (34) covers the loop conveyor (311).

Description

Dehumidifying and drying device

Technical Field

The present invention relates to drying of dewatered sludge obtained by dewatering activated sludge generated in a sewage treatment facility or the like.

Background

Generally, dewatered sludge produced in sewage treatment facilities and the like is reused as a resource. Although there are various recycling destinations, it is not uncommon to use the dewatered sludge as it is, and the water content is adjusted depending on the use of the recycling destination.

The adjustment of the water content is generally performed by evaporating water in the dewatered sludge (drying the dewatered sludge). In this case, the temperature on the dehydrated sludge side, the temperature on the gas side (mostly air), the humidity, and the air pressure are generally operated so that the moisture of the dehydrated sludge is easily moved to the gas side.

Mechanical-based drying means include direct heat drying and indirect heat drying.

The direct heating drying is a drying method in which the dewatered sludge is directly contacted with a heating medium to transfer heat, and examples of the heating medium include hot air for drying at a higher temperature than the dewatered sludge, heated water vapor, and the like.

The indirect heating and drying is a drying method in which the dewatered sludge is indirectly transferred from the heating medium by contacting with the heat transfer surface of the heat transfer body, and the heat transfer body may be a material having high heat resistance and heat transfer property such as a metal plate. Further, as the heating medium, steam is generally used.

In any of the drying methods, the drying efficiency is improved, and the opportunity of contact with a heating medium or a heat transfer surface is increased by stirring, or the dewatered sludge before drying is shaped to increase the surface area per unit weight.

Here, when the temperature is raised to a high temperature so that water in the dewatered sludge can be rapidly evaporated, the odor component contained in the dewatered sludge moves to the gas side to generate an odor, or the odor is absorbed by the moisture moving to the gas side to generate an odor in the separated moisture.

In the conventional drying technique of the direct heating method, the sludge is dried by hot air at a high temperature (100 ℃ or higher). Therefore, the dry exhaust gas containing odor components such as hydrogen sulfide and ammonia is retained at, for example, about 800 ℃ for several seconds, and is deodorized by pyrolysis.

However, in this method, the ratio of the heat for sludge drying (evaporation water amount × latent heat of water) among the applied heat is low, and the drying energy efficiency is low. Alternatively, in addition to the latent heat of evaporation of moisture required for drying, a large amount of heat required for deodorization needs to be supplied as sensible heat, so that drying energy efficiency is low.

There is a technique of drying dehydrated sludge at a low temperature in order to suppress the movement of odor components from the dehydrated sludge side to the outside. In this case, since the evaporation of water is slow and the drying time is long, it is necessary to increase the size of the apparatus or to install a plurality of apparatuses in order to treat a large amount of dewatered sludge.

As a measure for shortening the drying time of the dewatered sludge even at low temperature, it is useful to increase the drying efficiency by increasing the surface area (specific surface area) per unit weight of the dewatered sludge. In the case of recycling, since the water content of the dried product is required to be within a constant range, a forming machine for uniformly forming the dewatered sludge having a high viscosity is required.

As for the problems associated with the drying of such dewatered sludge, a technique (patent document 1) has been proposed, which includes: a cooling step of cooling air for drying to a temperature 5 ℃ or lower than the temperature of sludge immediately after drying and dehumidifying the cooled air; a heating step of heating the air cooled in the cooling step to 40 ℃ or higher to obtain air for drying; and a drying step of directly contacting the drying air with the sludge to be dried and drying the sludge at a temperature of 25 to 60 ℃ immediately after the drying, wherein the cooling step cools and dehumidifies air whose temperature is lowered and humidified by the drying step, thereby drying the sludge by circulating a heating medium. By drying the sludge at a relatively low temperature, the production of malodorous gases is reduced.

Further, there has been proposed a dewatered sludge forming machine which is less susceptible to the influence of the viscosity of the dewatered sludge, does not have the problem of adhesion of the sludge, and does not have the problem of biting of foreign matters generated by the compression roller (patent document 2).

Further, a sludge drying treatment apparatus has been proposed which can ensure a large treatment capacity, can perform drying treatment efficiently at low cost, and can reduce labor and time required for maintenance (patent document 3).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2001 and 70995

Patent document 2: japanese patent laid-open No. 2012-179591

Patent document 3: japanese laid-open patent publication No. 2007-105565

Disclosure of Invention

Problems to be solved by the invention

In view of the present invention, the inventors of the present invention have recognized at least the problems described below.

In the method for drying sludge of patent document 1, the drying time is prolonged because the temperature of the sludge immediately after drying is set to a low temperature in the range of 25 to 60 ℃. In addition, there are problems as follows: measures for shaping and homogenizing the sludge to be dried are required to stabilize the drying quality, which makes the equipment large-sized and necessitates stabilization of the sludge shaping quality.

When the dewatered sludge former of patent document 2 is used for low-temperature drying, the number of holes of the perforated plate needs to be increased in order to form the dewatered sludge into a small diameter suitable for low-temperature drying, and thus there is a problem that the width of the perforated plate is increased and the width of the conveyor needs to be increased accordingly.

On the contrary, when the diameter of the hole is determined by the conveyor, there is a problem that the dehydrated sludge in a rope form has a large diameter, and in order to dry the sludge at a low temperature, it is necessary to extend the drying time, and the apparatus is large in size.

In order to prevent the width of the perforated plate from being widened, for example, in the case where the holes of the perforated plate are arranged like a watering can, in the case where the holes are arranged in two stages or three stages in the conveying direction of the conveyor, or in the case where a chute in which the outlet is narrowed down to the width of the conveyor is laid on the conveyor, there is a problem that the dehydrated sludge in a rope form is piled up and arranged on the conveyor, the chance of contact with the heating medium becomes uneven, and the local reduction in drying efficiency occurs, and in order to compensate for this, it is necessary to increase the circulation amount of the heating medium or to extend the drying time, and to increase the chance of contact with the dehydrated sludge. Such measures have a problem that power needs to be increased or the size of the apparatus needs to be increased.

Further, if the number of holes is increased, foreign matter may entangle or clog the holes that extrude the dewatered sludge into a rope shape, thereby increasing the frequency of clogging, leading to an increase in the frequency and time of cleaning and a decrease in the amount of drying treatment.

The sludge drying apparatus and the sludge drying method of reference 3 are configured such that the water-containing sludge is attached to the surface of the heating drum, the sludge having a reduced water content is scraped off from the surface of the heating drum by the scraper, and the water-containing sludge in contact with the surface of the heating drum is exposed to a high temperature, and therefore, there is a problem that local deterioration of the sludge due to heat and generation of odor cannot be suppressed.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a dehumidifying dryer capable of efficiently drying sludge and obtaining a dried product with stable quality even when drying is performed at a low temperature in order to suppress deterioration of sludge and generation of odor.

Means for solving the problems

Structure 1

A dehumidification drying device is provided with: a shaping unit having a shaper for shaping a dried object into a cylindrical shape and a cutter for cutting off the cylindrical dried object; and a drying unit including an endless wire conveyor having an endless wire, receiving a drying object from the forming unit, and conveying the drying object in a horizontal direction, a cover covering the endless wire conveyor, a dehumidifier removing humidity of air in the cover, and a heater heating the air dehumidified by the dehumidifier with warm water, the shaper including: a receiving port and a delivery port; a cylindrical outer body; and a cone disposed inside the outer body so that a vertex faces the receiving opening and a bottom face faces the delivery opening, the cutter including: one or more cutting blades each including a cutting portion for cutting off the dried object extruded from the shaper, and a guide surface for peeling off the cut dried object from the dried object extruded from the shaper; and a driving device for moving the cutting blade along the delivery port.

Structure 2

The dehumidifying and drying device according to structure 1 is characterized in that the diameter of the delivery port is larger than the diameter of the receiving port.

Structure 3

The dehumidifying and drying device according to configuration 1 or configuration 2 is characterized in that the forming unit includes a dispersing device for dispersing the formed drying object.

Effects of the invention

According to the dehumidifying and drying apparatus of the present invention, even when drying is performed at a low temperature in order to suppress deterioration of sludge and generation of odor, the object to be dried can be dried efficiently, and a dried object having stable quality can be obtained.

Drawings

Fig. 1 is a schematic diagram showing a dehumidifying and drying apparatus according to an embodiment of the present invention.

Fig. 2 is a schematic diagram showing a molding machine in the dehumidifying and drying apparatus according to the embodiment.

Fig. 3 is a schematic diagram showing a dispersing machine in the dehumidifying and drying apparatus according to the embodiment.

Fig. 4 is a schematic configuration diagram of the entire dehumidifying and drying apparatus according to the embodiment.

Fig. 5 is a diagram showing a principle of a basic mechanism of drying.

Fig. 6 is a graph showing three periods of the relationship between the water content and the drying rate.

Detailed Description

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. The following embodiments are merely embodiments for embodying the present invention, and are not intended to limit the scope of the present invention.

Fig. 1 is a partial cross-sectional view showing a dehumidifying and drying apparatus 1 according to an embodiment of the present invention shown in fig. 4.

The dehumidifying and drying apparatus 1 of the present embodiment is composed of a forming section 2 and a drying section 3, the forming section 2 is composed of a shaper 21 and a cutter 22, the shaper 21 shapes an object to be dried K into a substantially cylindrical shape, the cutter 22 cuts the object to be dried K shaped into a substantially cylindrical shape, the drying section 3 is composed of a loop conveyor 31, a dehumidifier 32, a heater 33, and a cover 34, the loop conveyor 31 is provided with a loop 311, receives the object to be dried K from the forming section 2, and conveys the object to be dried K in a horizontal direction, the dehumidifier 32 removes humidity of air, the heater 33 heats the air dehumidified by the dehumidifier 32 with warm water, and the cover 34 covers the loop conveyor 31, the dehumidifier 32, and the heater 33.

First, the movement of the object to be dried K will be described. According to the present embodiment, the object to be dried K is supplied to the shaper 21 of the shaping section 2 by, for example, a pressure-feed pump, and is shaped into a substantially cylindrical shape. The drying object K shaped into a substantially cylindrical shape by the shaper 21 is cut by the cutter 22, formed into a uniform thickness, and laid over the receiving side 311ac of the endless wire 311a disposed at the uppermost stage of the endless wire conveyor 31.

The object K to be dried which has spread over the receiving side 311ac of the endless network 311a is conveyed toward the delivery side 311af of the endless network 311a, and is spread over the receiving side 311bc of the endless network 311 b. The object K to be dried which has spread over the receiving side 311bc of the loop network 311b is conveyed toward the delivery side 311bf of the loop network 311b, and is spread over the receiving side 311cc of the loop network 311 c. The object K to be dried, which has spread over the receiving side 311cc of the loop network 311c, is conveyed toward the delivery side 311cf of the loop network 311c, falls from the delivery side 311cf, and is discharged through the discharge port 346, whereby the dried object P is obtained.

The endless wire 311 (each of the endless wires 311a to c) is formed of a wire having a size such that the formed object to be dried K cannot pass therethrough, and is horizontally arranged in a so-called belt conveyor shape by at least a pair of cylindrical rotating bodies 312. At least one of the rotating bodies 312 is rotated by a driving machine (not shown) and conveys the endless wire 311 in one direction at a constant speed.

Next, drying of the object K to be dried will be described.

Fig. 5 is a diagram showing a principle of a basic mechanism of drying. The dried product has A: during preheating of the material, B: fixed rate drying period and C: three periods of drying with decreasing rate. A: the material preheating period is a period during which the material is heated, and the drying is performed a little. B: during the constant-rate drying period, all the heat flowing into the material is consumed by evaporation of water in a state where the temperature of the material is constant. During this period, free water is present at the surface and continues to exist as long as evaporation is occurring. C: the reduction rate drying period is a period until the water content reaches equilibrium after the evaporation rate of water decreases.

FIG. 6 is a graph showing three periods (A: material preheating period, B: constant rate drying period, and C: decreasing rate drying period) of the relationship between the water content and the drying rate. It is understood that the material is kept in a state where the drying rate is high from the material preheating period to the constant rate drying period, and the drying rate is also decreased as the water content is decreased in the decreasing rate drying period.

In the dehumidifying and drying apparatus 1, the object to be dried K on the endless web 311a comes into contact with air (a heating medium for heating and drying the object to be dried K) circulated and blown by the circulating machines 341a and b. The air circulated and blown is dehumidified by the dehumidifier 32, heated by the heater 33 using warm water as a heat source, sent to the drying unit 3 by the blower 331, and circulated and stirred by the circulators 341a and b circulating the air in the drying unit 3, thereby being uniformly held in the drying unit 3.

The object to be dried K which has just been formed by the forming section 2 and spread over the endless web 311a is in a state where the product temperature is low and the moisture content is high, and the temperature difference with the air in the drying section 3 is large. Although the object to be dried K is heated by contact with the air in the drying section 3, the temperature of the object to be dried K formed to have a uniform thickness is uniformly heated, and drying hardly progresses until the temperature becomes constant (material preheating period).

In this way, it is desirable that the material to be dried K stays on the endless wire 311a until at least the surface is dried during the material preheating period.

When the product temperature is constant and the heat quantity flowing into the drying object K is totally consumed by the evaporation of the moisture, the drying speed, that is, the speed of the moisture dissipation from the drying object K becomes the fastest. In this case, in the dehumidifying and drying device 1 of the present embodiment, as will be described later, the thickness of the object K to be dried is formed uniformly by the forming section 2, and therefore, the evaporation (drying) of the moisture of the object K is performed uniformly and efficiently. Therefore, even in low-temperature drying, a good dried product P can be obtained.

In addition, the drying rate can be controlled by the laying interval of the object to be dried K in addition to the control of the temperature and flow rate of the air as the heating medium and the control of the heating time. When the drying speed is increased, the paving interval of the dried object K is only required to be enlarged. The specific conditions may be set as appropriate depending on the state of the object to be dried K, the condition of the dried object P to be obtained (target water content), and the like. The control of the laying interval of the drying object K can be controlled by the supply amount of the drying object K, the conveying speed of the endless web conveyor 31, and the like.

The object K to be dried is formed to have a uniform thickness by the forming section 2 and easily laid flat on the endless web, and the object K to be dried is efficiently dried even in the reduced rate drying period without compensating for a decrease in the drying rate by enlarging the specific surface area of the object K after the constant rate drying period, so that the drying quality is not required to be made uniform by extending the drying time. The dried material K after completion of drying is discharged to the outside through the discharge port 346.

Next, the formation of the object K to be dried by the forming section 2 will be described.

Fig. 2 is a diagram showing the forming section 2 in the dehumidifying and drying apparatus 1 according to the embodiment shown in fig. 4.

The forming section 2 is composed of a shaper 21 and a cutter 22.

The shaper 21 includes: a cylindrical outer body 211 having a receiving port 213 and a delivery port 214 having a diameter larger than that of the receiving port 213; and a cone 212 disposed inside the outer body 211 so that the apex thereof faces the receiving port 213 and the bottom thereof faces the delivery port 214. The bottom surface of the cone 212 is disposed so as to be flush with or project toward the delivery port 214-side edge of the outer body 211, and a perpendicular line from the apex of the cone 212 to the bottom surface is disposed so as to be the same as the central axis of a cross section perpendicular to the delivery direction of the outer body 211.

The cutter 22 includes: a cutting blade 221 including a cutting portion 221a and a guide surface 221b, the cutting portion 221a cutting off the dried object extruded from the shaper 21, and the guide surface 221b peeling off the dried object cut off by the cutting portion 221a from the dried object extruded from the shaper 21; a cutting blade fixing member 224 for coupling the cutting blade 221 to the rotary shaft 223 of the driving device 222; and a driving device 222 for rotating the rotary shaft 223 around the center of the delivery port 214.

In the dehumidifying and drying device 1 of the present embodiment, the axis of the cone 212 and the rotation axis 223 are disposed coaxially, and the cone 212 is attached to be rotatable with respect to the rotation axis 223. Although the cone 212 is rotatable with respect to the rotation shaft 223, the cone 212 may be rotated (the cone 212 is fixedly attached to the rotation shaft 223) while the cone 212 is stopped during operation. As described later, a mechanism for moving the cone 212 in the direction of the rotation axis 223 of the cutter 22 may be provided as a mechanism for adjusting the thickness of the object to be dried K.

When the object to be dried K is pushed into the outer body 211 from the receiving port 213, it is transported from the apex of the cone 212 toward the delivery port 214 so as to be sandwiched between the side surface and the inner wall portion of the outer body. The cross section of the object to be dried K thus conveyed in the receiving port 213 so as to be circular in cross section perpendicular to the conveying direction is formed into an annular shape in the shaper 21 by the cone 212, and the width (thickness) thereof is gradually narrowed. When the object to be dried K is sent out from the outlet 214, the shape thereof becomes a substantially cylindrical shape having a uniform thickness. The object to be dried K is cut by the cutting portion 221a by moving the cutting blade 221 along the annular delivery port 214. In the present embodiment, the four cutting blades 221 are fixed to the circular cutting blade fixing member 224 at 90-degree intervals, and the cutting blades 221 are moved along the feed port 214 by being coupled to the rotary shaft 223 of the driving device 222 to be rotated.

In the embodiment, four cutting blades 221 are provided, but the number of cutting blades 221 may be appropriately set (at least one or more may be provided) depending on the size of the delivery port 214, the thickness of the object K to be dried (the gap between the delivery port 214 and the cone 212), the state and the supply amount of the object K, and the like.

The dried material K cut by the cutting portion 221a of the cutting blade 221 is extruded along a guide surface 221b, which is disposed so as not to contact the dried material K continuously extruded from the output port 214, and is molded into the dried material K having a uniform thickness. That is, the cutting portion 221a has a knife portion having a size corresponding to the thickness of the object K (the gap between the sending port 214 and the cone 212), and the guide surface 221b is formed so as to be continuously curved from the cutting portion 221a (so as to be curved so as to be away from the sending port 214), whereby the peeling of the object K is promoted, and the object K having a uniform thickness is peeled off.

The thickness of the object K to be dried can be adjusted by moving the cone 212 on the rotary shaft 223 of the cutter 22. When the cone 212 is moved in the direction of the cutter 22, the gap between the outer body 211 and the cone 212 is widened, and the substantially cylindrical object to be dried K having an increased thickness can be obtained. When the cone 212 is moved in the direction of the receiving port 213, the distance between the outer body 211 and the cone 212 is narrowed, and the substantially cylindrical object to be dried K having a reduced thickness can be obtained.

Next, the dispersing machine 23 for dispersing the dried material K formed by the forming section 2 in the width direction of the endless wire 311a will be described.

Fig. 3 is a diagram showing the dispersing machine 23 in the dehumidifying and drying apparatus 1 according to the embodiment shown in fig. 4.

The dispersing machine 23 is composed of a supply pipe 230, a connecting rod 231, an egg-shaped cam 232, and an egg-shaped cam driving device 233, wherein the supply pipe 230 connects the forming section 2 and the dried material K conveying pipe 4, the connecting rod 231 transmits the horizontal movement to the supply pipe 230, the egg-shaped cam 232 transmits the circular movement to one end of the connecting rod 231, and the egg-shaped cam driving device 233 rotates the egg-shaped cam 232.

The supply pipe 230 is an L-shaped pipe, one end of which is attached to the forming section 2, and the other end of which is connected to the dried material K conveying pipe 4 via a rotary joint 234. The connection rod 231 has one end rotatably connected to the supply pipe 230 to be movable in the horizontal direction and the other end rotatably mounted to the tip of an egg-shaped cam to be movable in the horizontal direction, wherein the egg-shaped cam is configured to be rotated in the horizontal direction.

The forming section 2 reciprocates in the short side direction of the endless wire 311a by a horizontal reciprocating motion generated by a horizontal circular motion of the egg-shaped cam 232 transmitted from the connecting rod 231 to the supply pipe 230. Therefore, the formed object to be dried K can be uniformly dispersed on the endless wire 311a, and the object to be dried K can be dried in a uniform state. The spreading performed by the disperser 23 is effective especially in the case where the width of the endless wire 311 is wide.

As described above, according to the dehumidifying and drying apparatus 1 of the present embodiment, since the forming section 2 and the drying section 3 are provided, the forming section 2 is constituted by the shaper 21 and the cutter 22, the shaper 21 shapes the object to be dried K into a substantially cylindrical shape, the cutter 22 cuts off the object to be dried K shaped into a substantially cylindrical shape, and the drying section 3 is constituted by the loop conveyor 31, the dehumidifier 32, the heater 33, and the cover 34, wherein the loop conveyor 31 is provided with the loop 311, receives the object to be dried K from the forming section 2, and conveys the object to be dried K in a horizontal direction, the dehumidifier 32 removes humidity of air, the heater 33 heats the air dehumidified by the dehumidifier 32 with warm water, and the cover 34 covers the loop conveyor 31, the dehumidifier 32, and the heater 33.

The dried material K is formed by the forming section 2 including the shaper 21 and the cutter 22, so that the thickness of the formed dried material K is uniform. Furthermore, they are laid on the endless web conveyor 31 without overlapping. Therefore, even in the drying with the air of a low temperature after the temperature is raised with the warm water, the drying of the object K can be performed uniformly, and the dried object P having the target water content can be obtained stably within the set drying time.

By horizontally conveying the object to be dried K by the endless wire conveyor 31, the external force applied to the object to be dried K formed to have a uniform thickness in the forming section 2 can be reduced, and thus the crushing of the object to be dried K after forming can be suppressed. Therefore, it is possible to prevent the small pieces of the object to be dried K, which are generated by the pulverization of the object to be dried K, from being dried and becoming powder, and from being attached to the dehumidifier 32 or the heater 33, thereby causing a decrease in efficiency.

By covering the endless web conveyor 31, the dehumidifier 32, and the heater 33 with the cover 34, the drying object K can be dried in an environment independent of the outside. Therefore, the temperature, humidity, and air flow in the drying section 3 can be arbitrarily controlled, and the object to be dried K can be dried to the target moisture content within a predetermined drying time. Further, it is possible to prevent odor from the material to be dried K, which is generated in a large amount, from being diffused to the outside. In the present embodiment, the case where the endless web conveyor 31, the dehumidifier 32, and the heater 33 are covered with the cover 34 is exemplified, but the present invention is not limited thereto, and separate covers may be provided (it is only necessary to place the drying section in an environment separate from the outside).

The dehumidifier 32 removes the humidity of the air in the drying unit 3, thereby supplying the air having a lowered humidity into the drying unit 3 again. Therefore, the humidity of the air in the drying section 3 is lowered, and the moisture of the object K is easily moved to the air in the drying section 3, thereby promoting the drying of the object K. Further, a part of the odor in the drying section 3 is removed by dehumidification. Further, since the air in the drying section 3 can be recycled, the amount of air to be extracted from the drying section 3 for the purpose of removing odor can be set to any amount. Therefore, the amount of air to be drawn can be matched to the processing capacity of the deodorization device.

The air dehumidified by the dehumidifier 32 is heated by the heater 33 using hot water as a heat source, whereby heat required for drying can be supplied into the drying unit 3. Therefore, the temperature of the air in the drying section 3 is stabilized, and the object K to be dried is heated, so that the moisture of the object K to be dried is easily moved to the air in the drying section 3, and the drying of the object K is promoted.

Since the hot water is used as a heat source, the temperature in the drying section 3 does not rise to such an extent that the odor component of the object K to be dried is volatilized. Therefore, the load on the deodorization device can be reduced, and the deterioration of the device such as corrosion can be prevented.

Since warm water is used as a heat source, renewable energy such as a solar water heater can be used as a heat source for producing warm water in addition to waste heat of a generator, an incinerator, a factory, or the like.

According to the forming section 2 of the present embodiment, the shaper 21 is provided as the outer body 211 and the cone 212, and the cutter 22 is provided as the one or more cutting blades 221 and the driving device 222 each including the cutting portion 221a and the guide surface 221b, so that the outer body 211 has the receiving port 213 and the delivery port 214 having a diameter larger than that of the receiving port, the cone 212 is disposed inside the outer body 211 so that the apex is directed toward the receiving port 213 side and the bottom surface is directed toward the delivery port 214 side, the cutting portion 221a cuts the object to be dried K extruded from the shaper 21, the guide surface 221b cuts the object to be dried K extruded from the shaper 21 away, and the driving device 222 rotates the cutting blade 221 about the center of the cross section perpendicular to the delivery direction of the outer body 211.

Since the gap between the outer body 211 and the cone 212 is gradually narrowed from the receiving port 213 toward the delivery port 214, a region where the object to be dried K is retained in the outer body 211, that is, a so-called dead space is not generated. Therefore, the clogging of the shaper 21 due to the deposition of the object to be dried K or the foreign matter mixed in the object to be dried K near the dead zone can be prevented. In the conventional molding device (for example, a dehydration and decontamination device in patent document 2), the sludge (object to be dried) is molded by the partition plate, the holes provided in the partition plate, or the like, and therefore clogging of the sludge is likely to occur due to dead spaces caused by the partition plate with holes or the like, but according to the dehumidification and drying apparatus 1 of the present embodiment, the outer body 211 in which the cone 212 is arranged at the center portion constitutes the molding section 2, so that the portions of the partition plate or the like that cause clogging are excluded as much as possible, and pressure is uniformly applied at the time of shaping the sludge (object to be dried), and therefore, occurrence of problems such as clogging can be suppressed.

Since the delivery port 214 is formed in an annular shape by the inner wall of the outer body 211 and the bottom edge of the cone 212, the object to be dried K can be extruded into a substantially cylindrical shape having a uniform thickness. By cutting off the drying object K with the cutting blade 221, the drying object K formed to have a uniform thickness can be easily and stably obtained.

By extruding the object to be dried K in a substantially cylindrical shape, the width of the forming section 2 is 1/3 or less compared with the width of a forming device having a linear slit for forming the object to be dried K in the same thickness as the thickness of the object to be dried K at the time of forming by the forming section 2, and the restriction of the width of the forming device on the width of the endless wire conveyor 31 can be reduced.

Since the cutting blade 221 includes the cutting portion 221a that cuts off the object to be dried K extruded from the shaper 21 and the guide surface 221b that peels off the cut object to be dried K from the object to be dried K extruded from the shaper 21, it is possible to prevent the cut object to be dried K from being deformed by contact with the object to be dried K extruded from the shaper 21, the objects to be dried K from adhering to each other and being deformed, or from being overlapped on the endless wire 311 a. Since the laying of the drying object K on the endless wire 311a is substantially the same even on the endless wire 311 after the endless wire 311a, the drying object K formed to have a uniform thickness can be stably laid on the endless wire conveyor 31.

Since the forming section 2 includes the dispersing machine 23 that disperses the dried material K after forming, the dried material K can be uniformly laid on the endless wire 311a even when the forming section 2 has a width smaller than that of the endless wire 311 a. Therefore, the upper surface of the wide endless web 311a can be used for drying without excess, and the drying throughput can be optimized. Further, the object to be dried K on the endless web conveyor 31 is uniformly exposed to the air in the drying section 3, and the quality of the dried object P is stabilized.

In the present embodiment, the shaper for shaping the object to be dried into a substantially cylindrical shape is taken as an example of the shaper, but the present invention is not limited to this, and the shaper for shaping the object to be dried into a cylindrical shape may be used. For example, the drying object may be shaped into an elliptical tube or a polygonal tube. Only the outer body and the cone corresponding to each shape are needed. However, a shaper formed in a substantially cylindrical shape as in the present embodiment is preferable because it is most efficient in obtaining a dried object having a uniform thickness.

Since the dehumidifying and drying device according to the present invention performs drying by low-temperature heat, it is possible to perform drying and volume reduction using waste heat of heat used in a product manufacturing process as a heat source for residue generated in a food processing process, for example.

Description of the symbols

1 dehumidifying and drying apparatus

2 forming section

21 shaper

211 outer body

212 Cone (Cone)

213 receiving port

214 outlet

22 cutting machine

221 cutting-off knife

221a cutting part

221b guide surface

222 driving device

23 dispersing machine

3 drying section

31 endless web conveyor

311 Ring network

32 dehumidifier

33 heating device

34 cover

Claims

1. A dehumidification drying device is provided with:

a shaping unit having a shaper for shaping a dried object into a cylindrical shape and a cutter for cutting off the cylindrical dried object; and

a drying section including an endless wire conveyor having an endless wire for receiving a drying object from the forming section and conveying the drying object in a horizontal direction, a cover for covering the endless wire conveyor, a dehumidifier for reducing humidity of air in the cover, and a heater for heating the air dehumidified by the dehumidifier with warm water,

the shaper includes:

a receiving port and a delivery port;

a cylindrical outer body; and

a cone disposed inside the outer body such that a vertex faces the receiving opening side and a bottom face faces the delivery opening side,

the cutting machine is provided with:

one or more cutting blades each including a cutting portion for cutting off the dried object extruded from the shaper, and a guide surface for peeling off the cut dried object from the dried object extruded from the shaper; and

and a driving device for moving the cutting blade along the delivery port.

2. The dehumidifying and drying apparatus according to claim 1,

the diameter of the delivery port is larger than that of the receiving port.

3. Dehumidification drying apparatus as in claim 1 or 2,

the forming section includes a dispersing machine for dispersing the dried material after forming.