KR102504044B1 - Sludge drying apparatus having moving device for supplying air into sludge using porosity air nozzle - Google Patents

Abstract

The present invention relates to a sludge drying apparatus comprising: a refrigerating cycle which generates low-temperature dry air; a blower which guides the dry air generated by the refrigerating cycle; a dry air inflow unit which introduces the dry air guided by the blower into a drying room; an air-permeable conveyor which distributes the dry air guided into the drying room throughout the drying room to achieve drying; a temperature sensor which detects a temperature of the dry air which is generated by the refrigerating cycle, guided by the blower, and introduced into the drying room through the dry air inflow unit, and a temperature of the dry air which is returned to the refrigerating cycle after drying the sludge; and a humidity sensor which detects the humidity in the drying room. The sludge drying apparatus includes: a diffuser which introduces dry air from the blower; a transfer pump which pumps dry air transferred to the drying room through the diffuser; and an air nozzle which sprays the dry air pumped by the transfer pump into the drying room. According to the present invention, the evaporation efficiency can be increased by bypassing some of heated dry air.

Description

Sludge drying device having a transfer device for supplying air to the inside of the sludge using a porous air nozzle

The present invention relates to a sludge drying apparatus having a transfer device for supplying air (dry air) to the inside of sludge using a porous air nozzle.

In more detail, the present invention induces rapid water evaporation of the initial water content by bypassing a part of the dry air recirculated from the heat exchanger, and physically pulverizes the internally bound water bound between the sludge molecules, Optimal drying of the sludge introduced into the dryer is what made it possible

The sludge treatment problem, which is increasing every year, is an environmental and social pending issue. Currently, various treatment technologies have been developed and applied to the field, but most of the technologies are hot air and high temperature drying technologies, causing various civil complaints such as odor and dust.

Therefore, there is an urgent need to develop a new technology tailored to the field that can overcome the limitations of the hot air drying method used in the past.

Currently, environment-oriented developed countries in Europe are applying a new low-temperature drying technology rather than a hot air drying method to minimize environmental pollutants such as odor and dust, and greatly improve the operational efficiency of treatment plants by improving energy efficiency.

In order to introduce these foreign advanced technologies, as a result of demonstration tests at domestic sites, it is not suitable for domestic conditions such as the properties of sludge, so it is better to develop low-temperature sludge drying technology suitable for domestic conditions and apply it to small and medium-sized sewage and wastewater treatment plants. became a top priority.

Sludge refers to the precipitate generated when suspended matter in water is separated from liquid by water purification and wastewater treatment, and is also called sludge.

Due to sludge's water content (more than 80%), perishability, pathogenicity, and containing harmful substances, environmental potential hazards and technical problems of treatment are important. In particular, the sewage sludge treatment problem, which is generated in large quantities due to the increase in the amount of sewage and solid substances in the inflow sewage due to the maintenance of sewage pipelines and the increase in the sewage supply rate, and the treatment of manure, requires comprehensive measures in terms of environmental preservation and recycling of useful resources. .

The amount of sewage treatment generated at sewage treatment plants nationwide has recently increased rapidly and is in a saturation state. Sludge generated in each region is being transported and landfilled to each landfill, and the transportation distance and landfill operating cost are rapidly increasing. Currently, sludge with a high moisture content causes various difficulties in terms of loading conditions in landfills across the country.

In order to solve this problem, a sludge dewatering process is usually performed.

In general, a mechanical dehydrator is used to reduce the moisture content, but the general moisture content is very high at 82 to 85%.

At present, when environmental regulations have been strengthened due to the high water content of dehydrated sludge, it is impossible to landfill or incinerate unless the water content is further reduced. During incineration, it is reported that the moisture content must be maintained at about 65% to secure the heat, so that direct combustion proceeds smoothly.

In addition to incineration, a hot air dryer using a high temperature of 100℃ or higher is applied for sludge recycling, and civil complaints are frequently generated due to problems such as odor, dust, and noise, and a lot of energy costs are incurred in drying. difficulties are arising.

In addition, when high-moisture sludge is introduced into the dryer, air permeability due to high viscosity is deteriorated and drying air is not introduced to the inside of the sludge, so it is difficult to dry the internally bound water.

Therefore, there is a need for a technology that allows dry air to flow into the sludge of the introduced high water content.

Patent Registration No. 10-1338379 relates to an air flow circulation type low-temperature hot air sludge drying treatment facility and treatment method. On the other hand, air discharged from the dryer is continuously circulated through a condensation process and dried at a low temperature to utilize low-temperature waste heat to increase economic feasibility and minimize odor and wastewater treatment problems. Since it is not a technology, there are limitations in improving drying speed and drying efficiency.

Patent Registration No. 10-0759237 relates to a sludge drying system, which includes an incinerator and a dryer, wherein the incinerator forms a primary combustion chamber and a secondary combustion chamber in communication with the primary combustion chamber, and the secondary In a system for drying sludge by waste heat by connecting a waste heat discharge pipe formed in a combustion chamber to a dryer, the other end of an exhaust gas conduit connected to an outlet of the dryer is connected to an inlet header of a heat exchanger, and the waste heat discharge pipe and the discharge A bypass conduit is connected between the gas conduits, first and second dampers are installed behind the connection points of the bypass conduit and the waste heat discharge pipe, respectively, and an automatic temperature controller is installed in the exhaust gas conduit. Therefore, by configuring the first and second dampers to open and close in opposite directions according to the output signal of the automatic temperature controller, the occurrence of odor can be well prevented with a simple configuration, but the inflow of dry air into the heating room Since it is not a related technology, there are limitations in improving the drying speed and drying efficiency.

1. Patent Registration No. 10-1338369 (registered on December 2, 2013, name: air circulation type low-temperature hot air sludge drying treatment facility and treatment method) 2. Patent Registration No. 10-0759237 (Registered on September 11, 2007, Name: Sludge Drying System)

The present invention has been made to improve the problems inherent in the prior art as described above, and an object of the present invention is to forcefully transfer dry air to a drying chamber through a diffuser, a duct, and a transfer pump, thereby drying a large amount of dry air. An air nozzle designed to spray air is used to destroy the bond between sludge molecules and moisture, which makes evaporation of the bound water inside the sludge difficult, so that the moisture inside the sludge can be evaporated. It is to provide a sludge drying device having a conveying device for supplying.

Another object of the present invention is to provide a sludge drying apparatus having a conveying device for supplying air to the inside of the sludge by using a porous air nozzle to increase evaporation efficiency by bypassing some heated drying air.

Another object of the present invention is to install a damper in the duct connected to the air nozzle so that it can be properly controlled according to the temperature and humidity of the drying room, a transfer device for supplying air to the inside of the sludge using a porous air nozzle It is to provide a sludge drying apparatus having.

Another object of the present invention is to use a porous air nozzle to appropriately control the operation of a transfer pump that forcibly transfers dry air from a diffuser through a duct to an air nozzle according to the temperature and humidity of the drying room. It is to provide a sludge drying device having a conveying device for supplying air therein.

The technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

Drying device having a transfer device for supplying air to the inside of the sludge using the porous air nozzle of the present invention for achieving the above object

A refrigeration cycle for generating low-temperature dry air, a blower for inducing the dry air generated by the refrigeration cycle, a dry air inlet for introducing the dry air induced by the blower into a drying chamber, and A ventilation conveyor that disperses dry air throughout the drying chamber to allow drying, and the temperature of the dry air generated by the refrigeration cycle and then induced by the blower introduced into the drying chamber and the temperature of the dry air returning to the refrigeration cycle after drying the sludge In the sludge drying apparatus consisting of a temperature sensor for detecting temperature and a humidity sensor for detecting humidity in the drying room,

a diffuser introducing dry air from the blower;

a transfer pump for pumping dry air transferred to the drying chamber through the diffuser; and

an air nozzle for injecting dry air pumped by the transfer pump into the drying chamber; It is characterized by consisting of.

In the present invention, it is characterized in that a duct is connected between the diffuser and the dry air injection nozzle so that the dry air is transferred from the diffuser to the air nozzle.

In the present invention, the air nozzle is characterized in that a plurality of injection holes are formed.

In the present invention, the dry air is generated by the refrigeration cycle and then induced by the blower and introduced into the drying chamber through the dry air inlet The temperature of the dry air returning to the refrigeration cycle after drying the sludge and the temperature of the drying air, It is characterized in that the amount is adjusted according to the humidity.

In the present invention, it is characterized in that the amount of dry air can be adjusted by driving a damper that controls the amount of dry air flowing into the air nozzle.

In the present invention, it is characterized in that the amount of dry air can be adjusted by driving a transfer pump that controls dry air flowing into the air nozzle.

In the present invention, it is characterized in that the adjustment of the amount of dry air by the damper starts with the driving of the damper located at the bottom.

In the present invention, the control of the amount of dry air by the transfer pump is characterized in that the transfer pump is stopped or the drive speed is adjusted.

According to the drying device having a transfer device for supplying air to the inside of the sludge using the porous air nozzle of the present invention, the drying air can be forcibly transferred to the drying chamber through a diffuser, a duct, and a transfer pump, and a large amount of dry air By constructing an air nozzle designed to spray, it is possible to improve the drying efficiency by evaporating the moisture inside the sludge at an early stage by destroying the bond between sludge molecules and moisture, which makes it difficult to evaporate the bound water in the sludge.

In addition, evaporation efficiency can be increased by bypassing some heated dry air.

In addition, by installing a damper in the duct connected to the air nozzle so that it can be properly controlled according to the temperature and humidity of the drying room, it is possible to improve the drying speed and drying efficiency, as well as to prevent power consumption and drying air waste.

In addition, the operation of the transfer pump, which forcibly transfers dry air from the diffuser through the duct to the dry air injection nozzle, can be appropriately controlled according to the temperature and humidity of the drying room, thereby improving drying speed and drying efficiency, as well as power consumption and drying. Air loss can be avoided.

Effects of the present invention are not limited to those described above, and other effects not mentioned will be clearly recognized by those skilled in the art from the description below.

1 is a configuration diagram for explaining a refrigeration cycle of a closed low temperature drying system according to a first embodiment of the present invention.
2 is a block diagram of a closed low-temperature drying system according to a first embodiment of the present invention.
FIG. 3 is a view schematically showing the flow of drying air to the drying chamber in the system of FIG. 2;
Figure 4 is a view showing the dry air flow of the blower of Figure 1;
5 is a view showing the blowing fan of FIG. 1;
6 is a view showing the relationship between the diffuser, duct, and air nozzle of FIG. 2;
7 is a detailed configuration diagram of the dry air injection nozzle of FIG. 6;
8 is a sequential configuration diagram illustrating the operation of the closed low-temperature drying system according to the first embodiment of the present invention to dry sludge.
9 is a configuration diagram showing air permeability of dry air.
10 is a graph showing the sludge drying performance of the closed low-temperature drying system according to the first embodiment of the present invention.
11 is a block diagram of a closed low-temperature drying system according to a second embodiment of the present invention.
12 is a block diagram of sludge drying control of a closed low-temperature drying system according to a second embodiment of the present invention.
13 is a flowchart of a sludge drying control operation of a closed low-temperature drying system according to a second embodiment of the present invention.
14 is a block diagram of sludge drying control of a closed low-temperature drying system according to a third embodiment of the present invention.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description.

However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

Terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention.

Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

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

[First Embodiment]

1 is a block diagram for explaining a refrigeration cycle of a closed low-temperature drying system according to a first embodiment of the present invention. 2 is a block diagram of a closed low-temperature drying system according to a first embodiment of the present invention. FIG. 3 is a diagram schematically illustrating a flow of drying air to a drying chamber in the system of FIG. 2 . 4 is a view showing the flow of dry air of the blower of FIG. 1; 5 is a view showing the blowing fan of FIG. 1; FIG. 6 is a diagram showing the relationship between the diffuser, the duct, and the air nozzle of FIG. 2 . 7 is a detailed configuration diagram of the dry air injection nozzle of FIG. 6; 8 is a sequential configuration diagram in which the closed low-temperature drying system according to the first embodiment of the present invention operates to dry sludge. 9 is a configuration diagram showing breathability of dry air. 10 is a graph showing the sludge drying performance of the closed low-temperature drying system according to the first embodiment of the present invention.

As shown in Figure 1, the sludge drying apparatus of the present invention is composed of a refrigerating cycle 100 for generating dry air by circulating a refrigerant.

The sludge drying apparatus of the present invention may include a blower 200 equipped with a fan rotating at a constant speed so that dry air that has passed through the refrigeration cycle 100 can be smoothly transferred into the sludge drying apparatus.

A plurality of blowers 200, preferably two, may be configured, and the air volume may be the same or different. However, it is not limited to these. In addition, the blower 200 may be configured to be in close contact with the dry air inlet 300 with a predetermined inclination angle so that the dry air passing through the refrigerating cycle 100 is transferred to the drying chamber without loss. That is, dry air is transferred to the drying chamber through the dry air inlet 300, and the dry air passing through the refrigerating cycle 100 is installed toward the dry air inlet 300 without loss as much as possible. At this time, the angle between the blower 200 and the dry air inlet 300 for the optimal air flow may be formed as a gradient angle of about 30°.

Two of the blowers 200 may be driven simultaneously, or one of them may be selectively driven according to the drying state of the sludge inside the drying chamber. The rotational driving of the blower 12 follows the control of the control unit 10 to be described later.

A dry air inlet 300 may be formed adjacent to the front portion of the blower 200 so that the dry air circulated by the blower 200 can be smoothly circulated.

A diffuser 350 may be configured as shown in FIG. 2 in proximity to the dry air inlet 300 .

In the diffuser 350, when the dry air supplied by the blower 200 is transferred toward the drying chamber through the dry air inlet 300, the dry air is randomly transported so that the dry air cannot be efficiently transported toward the drying chamber. It is configured in consideration of the fact that it can be connected to the duct 600 in the form of a pipe to intensively transport dry air to the drying room.

In addition, the diffuser 350 bypasses a portion of the dry air introduced from the blower 200 so that moisture evaporation of the initial moisture content can be achieved quickly. To this end, the diffuser 350 may be configured to transfer part of the dry air to the air nozzle 450 through the duct 600 and bypass the other part without passing through the duct. That is, the diffuser 350 is connected with a duct 600 for transporting the dry air as shown in FIG. 6 to transport the dry air to the air nozzle 450, can be connected to

As another embodiment, the duct 600 may be configured as a duct different from the duct connected to the air nozzle 450 so that the bypassed dry air flows into the drying chamber.

When the dry air introduced into the diffuser 350 is transferred to the drying chamber, the transfer pump 500 forcibly, that is, increases the transfer speed, so that the dry air can be rapidly transferred to the drying chamber. At this time, the transfer pump 500 may be configured to pump both dry air transferred to the air nozzle 450 and dry air bypassed and transferred to the drying chamber.

As shown in FIGS. 3 and 7, the sludge drying apparatus includes a plurality of air permeable conveyors 400 that automatically and continuously transport the introduced sludge, and a plurality of drying air blowing holes 455 on the upper side of these conveyors 400 ) The air nozzle 450 formed is configured. It is preferable that the spray holes 455 are formed in as many numbers as possible in order to improve the drying speed and drying efficiency of the sludge introduced into the drying chamber.

As shown in FIG. 6 , the air nozzle 450 is in the form of a ventilation pipe, and may also be configured to ventilate the duct 600 in the form of a pipe. At this time, the dry air transferred to the air nozzle 450 through the duct 600 is not returned to the diffuser.

In the state where the air nozzle 450 configured as described above is configured on the upper side of the conveyor 400, the drying air is forcedly transported by the transfer pump 500 and flows into the drying chamber through the diffuser 350 and the duct 600, so that the drying speed and Drying efficiency can be improved.

In addition, as some of the dry air is bypassed through the diffuser 350 and introduced into the drying chamber, moisture may be rapidly evaporated.

On the other hand, the conveyor 400 may be formed with a plurality of ventilation holes through which dry air passes within a range to prevent the sludge from falling down toward the conveyor located below. In this case, through the air nozzle 450 A large amount of dry air is sprayed to the sludge at once to improve the drying speed and drying efficiency, and the dry air sprayed from the spray hole 455 of the air nozzle 450 to dry the sludge on the conveyor 400 is transported between conveyors As a result, the sludge can be dried more quickly and reliably by the increased amount of drying air.

Although not shown, the present invention is composed of a sludge stirring unit that allows the contact area between the sludge and dry air to be increased, and the sludge stirring unit is formed in the form of a plurality of rake to crush the sludge put into the air permeable conveyor 400. , a distributor for distributing the sludge that has passed through the grinder, and a rotary agitator that agitates the sludge that has passed through the distributor so that the interior of the relatively less dried sludge can be exposed to dry air.

The crusher is a device that is disposed in the initial section of the air permeable conveyor and first crushes the sludge introduced into the air permeable conveyor.

The distributors are respectively installed on top of the plurality of air permeable conveyors and are spaced apart from each other at a minimum distance that does not interfere with the air permeable conveyors.

The distributor is formed in a form in which a plurality of wedges are suspended side by side in parallel, so that furrows are formed in the sludge that is transported by the air permeable conveyor and passes through the distributor. As a result, the problem of the sludge blocking the ventilation hole of the ventilation conveyor 400 is solved, so that the dry air can be smoothly ventilated through the ventilation hole of the ventilation conveyor 400.

The rotary agitator is installed at a position where the sludge furrow formed by the distributor collapses due to drying, and is spaced apart from the ventilation conveyor 400 at a minimum distance that does not interfere.

In addition, the rotary agitator more finely agitates the sludge that has passed through the distributor to agitate the surface portion of the sludge that is relatively dry and the interior of the sludge that is less dry, so that the entire sludge can be exposed to circulating air do.

In the sludge drying apparatus of the present invention, a height adjustment guide installed on top of the air permeable conveyor 400 may be configured to guide the sludge put into the air permeable conveyor 400 to be spread widely to a certain height.

The height adjustment guide is installed on the upper part of the ventilation conveyor 400, and the cross section is formed in the shape of an alphabet 'J'. Therefore, the sludge that is transported by the air permeable conveyor 400 and passes through the height adjustment guide comes into contact with the lower surface of the height adjustment guide so that it can be compressed. That is, the height adjustment guide guides the height of the sludge passing through the height adjustment guide to be equal to the height of the lower surface of the height adjustment guide, and allows the sludge to spread widely. In addition, the height of the height adjustment guide can be adjusted according to the moisture content of the sludge introduced into the air permeable conveyor 400 .

In the sludge drying apparatus of the present invention configured as described above, dry air at a constant temperature generated by the refrigeration cycle flows into the diffuser 350, and the diffuser 350 dries toward the air nozzle 450 of the drying chamber through the duct 600 transport air At this time, while the transfer pump 500 operates, the dry air transferred to the drying chamber through the duct 600 is forcibly transferred, and thus the transfer speed of the dry air increases. In addition, some of the drying air is bypassed and directly introduced into the drying chamber.

As described above, the dry air forcibly transported by the transfer pump 500 is applied to the sludge through the spray hole 455 of the air nozzle 450, thereby drying the sludge.

In this way, according to the present invention, as shown in FIG. 9, a large amount of dry air injected from the air nozzle 450 is ventilated to the inside of the sludge, and internal moisture such as bound water and pore water can be completely dried.

In addition, as shown in FIG. 10, by bypassing the high-dry condensed drying air and quickly transferring it to the drying chamber at the beginning, the drying efficiency of the high-moisture and high-viscosity sludge increases while overall drying performance can be improved.

[Second Embodiment]

11 is a block diagram of a closed low-temperature drying system according to a second embodiment of the present invention. 12 is a block diagram of a sludge drying control device of a closed low-temperature drying system according to a second embodiment of the present invention. 13 is a flow chart of a sludge drying control operation of a closed low-temperature drying system according to a second embodiment of the present invention.

In the drying system according to the second embodiment, the air nozzles 450 are located above each conveyor 400, and the dampers 1100, 1200, and 1300 are installed in the duct 600 for supplying dry air to the air nozzles 450. may be configured to correspond to each air nozzle 450, and the damper serves to maintain or block dry air transferred to each air nozzle 450. That is, while operating under the control of the control unit, the drying air is appropriately transferred to the drying chamber without waste.

As shown in FIG. 12, the sludge drying control apparatus of the present invention includes a first temperature sensor 910 for sensing the temperature of the dry air generated through the refrigeration cycle 100 through the filter 110, and the air permeability A second temperature sensor 920 for detecting the temperature of the dry air passing through the conveyor 400 and a humidity sensor 930 for detecting the humidity of the drying room may be configured.

In the sludge drying apparatus of the present invention, the control unit 10 controls the operation of the damper by processing and analyzing the detection signals of the sensors 910, 920, and 930.

During the initial operation, the controller 10 may store a program for driving the damper without considering the temperature and humidity in the drying chamber detected by the first and second temperature sensors 910 and 920 and the humidity sensor 930. there is.

In addition, the control unit 10 may process and analyze detection signals of the first and second temperature sensors 910 and 920 to store a program for driving the damper.

In addition, the control unit 10 controls the temperature detected by the first and second temperature sensors 910 and 920, that is, the temperature of the dry air transferred to the drying chamber and the temperature of the dry air returned to the refrigeration cycle, and the humidity sensor 930 A program that processes and analyzes the humidity in the drying room sensed by and connects all of these signals to drive the damper may be stored.

The damper driver 1000 shown in FIG. 12 drives the damper under the control of the controller 10 . Here, the damper driving means a state in which dry air transferred from the diffuser 350 is introduced into the drying chamber through the duct 600 .

That is, the control unit 10 processes and analyzes the temperature detected by the first and second temperature sensors 910 and 920 and the humidity in the drying chamber detected by the humidity sensor 930, and according to the analysis result, driving power is reduced and Since the drying operation is controlled to optimize the drying efficiency, the operation of the damper is appropriately controlled considering both the appropriateness of the temperature and the appropriateness of the humidity.

Next, referring to FIG. 13, the sludge drying operation flow for transporting dry air to enable optimal drying will be described.

The drying operation of the present invention includes the steps of generating dry air (S100), introducing dry air (S200), drying the sludge (S300), determining the amount of dry air (S400), controlling the amount of dry air (S500), , It may consist of a drying completion determination step (S600).

The dry air generation step (S100) is a step of generating low-temperature air for drying the sludge through the refrigeration cycle (100).

In the dry air introduction step (S200), the dry air generated by the refrigerating cycle 100 is introduced into the drying chamber through the diffuser 350, the duct 600, the transfer pump 500, and the damper 1100. That is, the dry air generated by the refrigerating cycle 100 is introduced into the diffuser 350, and is then forcibly transported toward the drying chamber through the duct 600 while the transfer pump 500 operates. At this time, all of the dampers are driven so that dry air can be introduced.

The sludge drying step (S300) is a step of drying the sludge while spraying dry air through the dry air spray nozzle 450 while the damper is driven as described above.

Sludge drying may be performed for a predetermined time according to the humidity detected by the humidity sensor 930. That is, the control unit 10 stores the amount of drying air inflow according to humidity and the drying time, etc., so that drying is performed for a certain period of time based on this.

The dry air amount determination step (S400) is a step of determining whether or not the amount of dry air injected into the sludge through the air nozzle 450 should be introduced while the damper is continuously driven and maintained.

That is, since the control unit 10 stores a program that appropriately controls the operation of the damper when the sludge in the drying chamber is dried to a certain extent, for example, when it is determined that about 90% of the drying has been achieved, the control unit 10 operates the damper. It is properly controlled so that drying is performed while the drying air is transferred to the corresponding air nozzle. In this way, it is possible to quickly dry and save driving power at the same time.

The drying air amount control step (S500) is a step of adjusting the amount of dry air introduced into the drying chamber by the control unit 10.

The controller 10 may analyze and compare the temperature values detected by the temperature sensors 910 and 920 and the humidity detected by the humidity sensor 930, and control the amount of dry air according to the comparison result.

That is, the amount of dry air can be controlled according to how the temperature value sensed by the temperature sensors 910 and 920 and the humidity value sensed by the humidity sensor 930 change. For example, if the humidity changes much faster than expected (lower), the damper can be controlled to adjust the amount of drying air.

At this time, it is preferable to selectively drive the damper so that the transport of dry air is blocked by driving the damper connected to the lowermost air nozzle, if possible. This means that after the dry air injected into the conveyor located at the top is injected from the air nozzle corresponding to it, it is transferred to the conveyor located at the lower side through this conveyor. This is because it may be the same as a relatively large amount of dry air being applied.

The drying completion determination step (S600) is a step of determining whether drying has been completed when a predetermined time has elapsed after controlling the amount of drying air.

This determination may be determined by, for example, humidity detected by the humidity sensor 930 . That is, since the controller 10 stores the initial humidity before drying and the humidity after drying is completed, the controller 10 analyzes the detection signal input through the humidity sensor 930 in real time to complete drying of the sludge to determine whether it has been

[Third Embodiment]

14 is a block diagram of sludge drying control of a closed low-temperature drying system according to a third embodiment of the present invention.

The drying system according to the third embodiment appropriately controls the driving of the transfer pump 500 according to the sludge drying state, and is omitted in FIG. 14, but like the second embodiment, the damper 1100 , 1200, 1300) may be configured, respectively, and play a role of maintaining or blocking the dry air transferred to each air nozzle 450 through the dampers, and at the same time controlling the driving of the transfer pump 500 to dry Air is properly transported without waste to the drying chamber.

That is, the transfer of dry air may be controlled using only the transfer pump 500, or the transfer of dry air may be controlled by controlling the transfer pump in conjunction with a damper.

As in the second embodiment, the control unit 10 analyzes and compares the temperature value sensed by the temperature sensors 910 and 920 and the humidity sensed by the humidity sensor 930, and compares them with each other, and the amount of dry air according to the comparison result. can control.

That is, the amount of dry air can be controlled according to how the temperature value sensed by the temperature sensors 910 and 920 and the humidity value sensed by the humidity sensor 930 change. For example, when humidity changes very quickly (lower) than expected, the transfer pump 500 may be controlled through the transfer pump driver 550 to adjust the amount of dry air.

At this time, the control of the transfer pump 500 can be divided into a method of temporarily stopping the operation of the pump and a method of adjusting the speed of the pump. For example, when the speed of the transfer pump 500 is lowered, the amount of dry air transferred to the drying chamber for a certain period of time can be adjusted, so this method is applied.

In the case of control in association with the damper, the amount of dry air can be adjusted by driving at least one or two dampers according to the speed of the transfer pump 500.

Even in this case, as in the second embodiment, it would be preferable to selectively drive the damper so that the dry air transport is blocked according to the drive of the damper connected to the air nozzle located at the bottom. This means that after the dry air injected into the conveyor located at the top is injected from the air nozzle corresponding to it, it is transferred to the conveyor located at the lower side through this conveyor. This is because it may be the same as a relatively large amount of dry air being applied.

As described above, the detailed description of the present invention has been described with respect to the preferred embodiments of the present invention, but this is the best embodiment of the present invention described by way of example, but does not limit the present invention. In addition, it is of course possible for anyone having ordinary knowledge in the technical field to which the present invention belongs to various modifications and imitations without departing from the scope of the technical idea of the present invention.

Therefore, the scope of the present invention is not limited to the above-described embodiments, but may be implemented in various forms of embodiments within the scope of the appended claims. And without departing from the subject matter of the present invention claimed in the claims, anyone with ordinary knowledge in the art to which the invention pertains is considered to be within the scope of the claims of the present invention to various extents that can be modified.

An embodiment of a device for implementing a sludge drying device having a transfer device for supplying air to the inside of the sludge using a porous air nozzle has been described. The embodiments described above are illustrative of some of the many specific embodiments that demonstrate the principles described herein. Therefore, by using the embodiments of the present invention, those skilled in the art will be able to easily implement many other arrangements within the scope defined by the claims of the present invention.

10: control unit 300: dry air inlet unit
350; Diffuser 400: Ventilation Conveyor
450: air nozzle 455: injection hole
500: transfer pump 600: duct
910. 920: temperature sensor 930: humidity sensor
1000: damper driving unit 1100, 1200, 1300: damper

Claims (8)

A refrigeration cycle that generates low-temperature dry air, and a plurality of blowers configured with different air volumes so that two of them are simultaneously driven or selectively driven according to the drying condition of the sludge inside the drying chamber to induce the dry air generated by the refrigeration cycle. And, a dry air inlet for introducing the dry air induced by the blower into the drying chamber, a ventilation conveyor for dispersing the dry air introduced into the drying chamber throughout the drying chamber so that drying is performed, and the refrigerating cycle generated Then, a temperature sensor for detecting the temperature of the dry air introduced by the blower and introduced into the drying chamber through the dry air inlet and the temperature of the dry air returning to the refrigeration cycle after drying the sludge, and a humidity sensor for detecting the humidity of the drying chamber. In the sludge drying device,
a diffuser introducing dry air from the blower;
The diffuser transfers some of the dry air introduced from the blower to the air nozzle through a duct connected between the diffuser and the air nozzle so that the moisture evaporation of the initial water content is rapid, and the other dry air is bypassed without passing through the duct to dry the room. introduced into;
a transfer pump for pumping dry air transferred to the drying chamber through the diffuser;
The transfer pump pumps both the dry air transferred to the air nozzle and the dry air bypassed and transferred to the drying chamber; and
an air nozzle for injecting dry air pumped by the transfer pump into the drying chamber; made up of,
The amount of dry air pumped into the drying chamber by the transfer pump is determined by the temperature of the dry air generated by the refrigeration cycle and then introduced by the blower and introduced into the drying chamber through the dry air inlet, and the temperature of the dry air returned to the refrigeration cycle after drying the sludge. It is controlled by a damper or a transfer pump according to the temperature and humidity of the drying room,
The adjustment of the amount of dry air by the damper is performed by controlling the damper connected to the air nozzle for spraying dry air to the lowermost conveyor,
Sludge drying apparatus having a transfer device for supplying air to the inside of the sludge using a porous air nozzle, characterized in that the adjustment of the amount of drying air by the transfer pump is performed by stopping the operation of the transfer pump or adjusting the driving speed.
delete The method of claim 1,
The air nozzle is a sludge drying apparatus having a transfer device for supplying air to the inside of the sludge using a porous air nozzle, characterized in that a plurality of injection holes are formed and configured on the upper side of the conveyor. delete delete delete delete delete

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