KR102599503B1 - Sludge indirect drying system - Google Patents

Abstract

The sludge indirect drying system 100 of this invention includes a transfer facility 110 for transferring the sludge dehydration cake in the sludge storage tank, a preheating facility 120 for preheating the sludge dewatering cake transferred along the transfer facility 110, A drying facility (130) that receives the sludge dehydration cake preheated by the preheating facility (120), dries it by an indirect drying method, and discharges it, and by-products (water vapor, harmful gases) generated from the preheating facility (120) and the drying facility (130). , fine dust, etc.), and a control panel 150 that controls the operation of the deodorizing facility 140, and the transfer facility 110, the preheating facility 120, and the drying facility 130.

Description

Sludge indirect drying system

This invention relates to a sludge indirect drying system. More specifically, the sludge dewatering cake generated in sewage treatment plants, wastewater treatment plants, etc. is preheated to a certain temperature before being put into the drying furnace, and then put in, depending on the input amount and preheating and drying conditions. This relates to a sludge indirect drying system in which the relevant components operate automatically in conjunction with each other to efficiently dry the sludge dewatering cake.

Sludge generated during the water purification process at sewage treatment plants and wastewater treatment plants contains approximately 99.2 to 99.9% moisture, so its volume must be reduced during the sludge treatment process for the purpose of efficiency in transportation and final treatment (incineration, landfill, recycling, etc.). Dehydrate to do this. As marine dumping has been completely banned since January 2016 (Marine Environment Management Act), the cost of sludge dewatering cake has increased every year, and the standards for incineration and entry into landfills have been strengthened (dewatering cake moisture content of 75% or less), thereby ensuring effective treatment of sludge dewatering cake. Technology was needed to do this.

In the above, sludge refers to the residue generated when water is purified in water treatment facilities such as sewage treatment plants, wastewater treatment plants, and water purification plants, and sludge dewatering refers to sludge generated from sewage treatment plants and wastewater treatment plants, etc., with an organic content of about 80% and an organic content of about 90%. Because it contains an abnormal moisture content, it can cause secondary contamination due to volume and putrefaction during final disposal, so this is a process that reduces the volume through dehydration to facilitate final disposal.

In addition, the dehydration cake is improved with chemicals (organic coagulants, inorganic coagulants, etc.) to reduce the volume of sludge generated during the sewage treatment process and wastewater treatment process to about 99.2 to 99.9%, and then used in centrifugal dehydrators, follicle dehydrators, and screw dehydrators. It refers to sludge whose moisture has been reduced using a press dehydrator, etc. Usually, the water content of sewage or wastewater sludge dewatering cake is about 65 to 83% and varies depending on the dehydrator.

Meanwhile, one of the methods applied for effective treatment of dewatering cake is sludge dewatering cake drying technology. The drying technology for sludge dehydration cake is to introduce heat to vaporize and evaporate moisture to separate solid and liquid. It is largely divided into methods using hot air, conductive heat, and radiant heat. In relative terms, it is dried in the initial state with a large liquid content. This means reducing moisture to the target state. Important factors in the drying technology of the sludge dehydration cake include the water content of the sludge dehydration cake, heat transfer method, and moisture discharge method. In particular, the water vapor generated during sludge drying contains various substances contained in the sludge, and there is a problem in that odor-causing substances are generated along with the water vapor due to heat energy transfer.

The temperature of a typical sludge dehydration cake is about 13 to 20°C. When the sludge is put into a drying furnace for drying, the temperature inside the drying furnace decreases rapidly, which reduces heat transfer efficiency during the drying process.

Meanwhile, in the past, the timing and end of inputting the sludge dewatering cake into the sludge drying furnace was artificially configured to open and close the inlet and outlet of the drying furnace by using the level of input, etc. with the naked eye. If the operator opens and closes the inlet when feeding the sludge dehydration cake into the dryer according to the naked eye, problems such as safety problems, reduced heat transfer efficiency, and leakage of odorous substances may occur.

Public Patent No. 2015-0126149

Therefore, this invention was developed to solve the problems of the prior art as described above. Before putting the sludge dewatering cake generated in sewage treatment plants, wastewater treatment plants, etc. into the drying furnace, it is preheated to a certain temperature and then put in. The purpose is to provide a sludge indirect drying system that efficiently dries the sludge dewatering cake by automatically operating the relevant components in conjunction with preheating and drying conditions.

The sludge indirect drying system of this invention for achieving the above object includes a transfer facility for transferring the sludge dehydration cake in the sludge storage tank, a preheating facility for preheating the sludge dewatering cake transported along the transfer facility, and the preheating facility. A drying facility that receives the preheated sludge dehydration cake, dries it by indirect drying, and discharges it, a deodorizing facility that receives and deodorizes by-products generated from the preheating facility and the drying facility, and the transfer facility, preheating facility, and drying facility. It includes a control panel that controls the operation of the preheating equipment, and the preheating equipment is arranged to seal some sections of the transfer equipment, forming a certain space in the upper part of the partial sections and allowing the inflow and discharge of the sludge dewatering cake on one side and the other. A preheating furnace having an inlet and an outlet, a magnetron in communication with the preheating furnace to output microwaves within the preheating furnace to preheat the sludge dehydration cake, and a magnetron in communication with the preheating furnace to preheat the sludge dehydration cake by removing by-products. An exhaust hood that discharges toward the deodorizing equipment, a blower that is connected to the preheating furnace and blows air so that the airflow in the preheating furnace is formed toward the outlet and the exhaust hood, and the internal temperature of the preheating furnace or the transfer equipment in the preheating furnace. It includes a plurality of temperature sensors that measure temperature, and the drying facility has an internal volume capable of accommodating a certain amount of preheated sludge dehydration cake, an inlet and an outlet for inputting and discharging the sludge dehydration cake on one side and the other, and has a circumference. A drying furnace that has a flow structure that allows heat medium oil to flow along the drying furnace to dry the sludge dehydration cake preheated by the heat of the heat medium oil, and rotates forward or reverse with the driving force of the motor to dry the sludge dehydration cake in the drying furnace inside the drying furnace. A stirrer that assists in drying the sludge dehydration cake by crushing it while transporting it, a heat oil boiler that circulates and supplies the heat oil at a constant temperature along the perimeter of the drying furnace, and the weight of the sludge dehydration cake charged into the drying furnace. and a plurality of load cells that measure the weight of the sludge dewatering cake during the drying process.

In addition, according to this invention, the control panel includes a preheating logic unit and a drying logic unit, and the preheating logic unit performs sludge dehydration using the plurality of load cells so that only the sludge dehydration cake of a set weight is input into the drying furnace. The weight of the cake is measured, and the operation of the sludge storage tank, transfer equipment, blower, and magnetron is controlled according to the measured value, and the drying logic unit heats the drying furnace with the heat of the heat medium oil while the outlet of the drying furnace is closed. In addition, it is desirable to dry the sludge dehydration cake by operating the stirrer, measure the weight loss of the sludge dehydration cake using the plurality of load cells, and control the operation of the stirrer, heat oil boiler, and drying furnace according to the measured value. .

In addition, according to this invention, the preheating logic unit measures the internal temperature of the preheating furnace or the temperature of the transfer equipment within the preheating furnace so that the sludge dewatering cake is preheated to a set temperature, and operates the magnetron according to the measured value. Control is more desirable.

Additionally, according to this invention, it is more preferable that the internal temperature of the preheating furnace or the temperature of the transfer equipment within the preheating furnace is set so that the preheating temperature of the sludge dewatering cake is 50 to 100°C.

Additionally, according to this invention, the exhaust hood may further be provided with an electromagnetic wave exposure blocking net at an end.

In this invention, the sludge dewatering cake generated in sewage treatment plants, wastewater treatment plants, etc. is preheated to a certain temperature before being put into the dryer, and the corresponding components automatically operate in conjunction with the input amount and preheating and drying conditions to dehydrate the sludge. It has the advantage of drying cakes efficiently.

1 is a block diagram of a sludge indirect drying system according to an embodiment of the present invention,
Figure 2 is a conceptual diagram of the sludge indirect drying system shown in Figure 1,
Figures 3 and 4 are front and side detailed views of the transfer equipment and preheating equipment shown in Figure 2;
FIG. 5 is an operation flowchart of the preheating logic unit of the control panel shown in FIG. 1;
FIG. 6 is an operation flowchart of the dry logic unit of the control panel shown in FIG. 1;
Figure 7 is a graph of the phase change of water for setting the preheating temperature of the sludge dehydration cake in this invention.

Hereinafter, a preferred embodiment of the sludge indirect drying system according to the present invention will be described in detail with reference to the attached drawings. This invention is not limited to the embodiments disclosed below and may be implemented in various different forms, but these embodiments only serve to make the disclosure of this invention complete and to fully convey the scope of the invention to those skilled in the art. It is provided for information purposes only.

The sludge indirect drying system of this invention can be used to dry sludge and sludge dewatering cake generated from sewage sludge, wastewater sludge, purified water sludge, food waste, food waste water, livestock waste water, excrement, etc.

When a typical sludge dehydration cake is put into a drying furnace for drying purposes, the temperature is about 13~20℃. Meanwhile, in the drying furnace, the sludge dewatering cake is dried while maintaining a temperature of approximately 250 to 350°C. Therefore, when a sludge dehydration cake of about 13 to 20℃ is directly put into a drying furnace operating at about 250 to 350℃, the heat transfer efficiency in the drying furnace decreases (temperature decrease due to input of the sludge dehydration cake, etc.) It can cause problems.

In the sludge indirect drying system of this invention, the sludge dehydration cake is preheated to a certain temperature before inputting it into the drying furnace, and the corresponding components operate automatically in conjunction with the input amount and preheating and drying conditions to efficiently dehydrate the sludge cake. It is designed to be dried.

Figure 1 is a block diagram of a sludge indirect drying system according to an embodiment of the present invention, Figure 2 is a conceptual diagram of the sludge indirect drying system shown in Figure 1, Figures 3 and 4 are the transport equipment shown in Figure 2 and Detailed front and side views of the preheating facility. And, Figure 5 is an operation flowchart for the preheating logic part of the control panel shown in Figure 1, Figure 6 is an operation flowchart for the drying logic part of the control panel shown in Figure 1, and Figure 7 is a flowchart of the sludge dewatering cake in this invention. This is a graph of the phase change of water for setting the preheating temperature.

As shown in FIGS. 1 to 4, the sludge indirect drying system 100 according to this embodiment includes a transfer facility 110 for transferring the sludge dewatering cake in the sludge storage tank, and a transfer facility 110 that is transferred along the transfer facility 110. A preheating facility 120 that preheats the sludge dehydration cake, a drying facility 130 that receives the sludge dehydration cake preheated by the preheating facility 120, dries it and discharges it by indirect drying, and a preheating facility 120 and drying device. The operation of the deodorizing facility 140, which receives and deodorizes by-products (water vapor, harmful gases, fine dust, etc.) generated in the facility 130, and the transfer facility 110, preheating facility 120, and drying facility 130. It is configured to include a control panel 150 for control. Meanwhile, the sludge indirect drying system 100 of this embodiment may further include a water treatment facility 160 for treating condensed water generated in the deodorization facility 140.

The transfer facility 110 transfers the sludge dewatering cake stored in the sludge storage tank and is configured to transfer by a conveyor drive method. In other words, the transfer equipment 110 can be configured to include a general endless track conveyor belt 111, a plurality of rollers 112, and a motor (not shown).

The preheating facility 120 preheats the sludge dewatering cake transported along the conveyor belt 111 of the transfer facility 110, and is arranged in a form to seal some sections of the conveyor belt 111, A preheating furnace 121 forming a certain space at the top and having an inlet and an outlet for the inflow and discharge of the sludge dewatering cake on one side and the other, and a microwave inside the preheating furnace 121 that is in communication with the preheating furnace 121. A magnetron (122) that outputs and preheats the sludge dehydration cake, and an exhaust hood (123) that communicates with the preheating furnace (121) and discharges by-products generated during preheating of the sludge dehydration cake toward the deodorizing facility (140), The first blower 124 is connected to the preheating furnace 121 and blows the airflow in the preheating furnace 121 toward the outlet of the preheating furnace 121 and the exhaust hood 123, and the internal temperature of the preheating furnace 121. Alternatively, it is configured to include a plurality of temperature sensors 125 that measure the temperature of the conveyor belt 111 in the preheating furnace 121.

The preheating furnace 121 forms a partial section by covering a partial section of the conveyor belt 111, that is, a partial length of the conveyor belt 111 in the longitudinal direction and the entire width direction of the length, and seals the partial section. It is configured to do so. Here, sealing should be interpreted as including complete sealing and partial sealing since the sludge dewatering cake must be introduced through the inlet of the preheating furnace 121. This preheating furnace 121 is used as a space for preheating the sludge dewatering cake transported along the conveyor belt 111 inside it.

Meanwhile, the preheating furnace 121 has an inlet and an outlet on one side and the other side. The entrance smoothly flows into the interior of the preheating furnace 121 with the sludge dewatering cake placed on the upper part of the conveyor belt 111, and electromagnetic waves due to the operation of the magnetron 122 are exposed to the outside of the preheating furnace 121. It is preferable to configure the curtains 126 to overlap each other so that the curtains 126 do not overlap each other. In addition, it is preferable that the outlet communicates with the inlet of the drying furnace 131 of the drying equipment 130, which will be described later.

The magnetron 122 is installed at the top of the preheating furnace 121 to communicate with the inside of the preheating furnace 121 through a waveguide 127 and outputs microwaves to the inside of the preheating furnace 121 to heat the sludge dehydration cake. To preheat, a general industrial magnetron 122 can be used. It is desirable to install this magnetron 122 close to the entrance of the preheating furnace 121.

The exhaust hood 123 is installed on the upper part of the preheating furnace 121 at a certain distance from the magnetron 122 and communicates with the interior of the preheating furnace 121 to remove by-products (water vapor, harmful gases) generated during preheating of the sludge dehydration cake. , fine dust, etc.) are discharged toward the deodorizing facility 140, and by-products such as the above are discharged toward the deodorizing facility 140 by the blowing force of the second blower 128 installed at the front of the deodorizing facility 140. . It is desirable to install this exhaust hood 123 close to the outlet of the preheating furnace 121. In addition, the exhaust hood 123 is preferably configured to have an electromagnetic wave exposure blocking net 129 at an end so that electromagnetic waves resulting from the operation of the magnetron 122 are not exposed to the deodorizing facility 140.

The first blower 124 is installed near the entrance of the preheating furnace 121 to communicate with the inside of the preheating furnace 121, so that the airflow in the preheating furnace 121 flows through the outlet of the preheating furnace 121 and the exhaust hood 123. ) plays a role in blowing air to form the By the operation of the first blower 124, the heating heat generated by the microwave is evenly distributed inside the preheating furnace 121 or forms an air current, and the sludge dehydration cake transported along the conveyor belt 111 is heated and preheated. , During this heating, the above-mentioned by-products (water vapor, harmful gases, fine dust, etc.) generated from the sludge dehydration cake flow toward the exhaust hood 123.

The plurality of temperature sensors 125 measure the internal temperature of the preheating furnace 121 or the temperature of the conveyor belt 111 within the preheating furnace 121, and maintain the sludge dewatering cake transported along the conveyor belt 111 under ideal conditions. Heat to preheat. Meanwhile, it is desirable to heat the sludge dehydration cake to a preheating temperature of about 50 to 100°C.

As can be seen from the phase change graph of water shown in FIG. 7, when the preheating temperature of the sludge dehydration cake is heated to exceed 100°C, the phase of the sludge dehydration cake (solid state, about the level of clay containing moisture) changes from a solid phase to a liquid phase ( It changes to a slurry state, making it difficult to transport it along the conveyor belt 111. In addition, when the sludge dehydration cake is heated to a preheating temperature of less than 50°C, the drying effect due to preheating is minimal when drying the preheated sludge dehydration cake inside the drying furnace 131 of the drying equipment 130, which will be described later. There is. Therefore, in this embodiment, the internal temperature of the preheating furnace 121 or the temperature of the conveyor belt 111 in the preheating furnace 121 is measured by a plurality of temperature sensors 125 so that the preheating temperature of the sludge dehydration cake is 50 to 100 ° C. You can control it by taking into account the correlation between each other while measuring.

For example, looking at the correlation between the internal temperature of the preheating furnace 121 and the preheating temperature of the sludge dewatering cake, it is as follows.

Generally, the moisture content of sludge dewatering cake generated in a wastewater treatment plant is about 80%. In other words, it can be said that 1kg of sludge dehydration cake contains about 800g of moisture. At this time, the temperature of the sludge dewatering cake is usually 13 to 20°C. Therefore, in this example, the amount of heat required to raise the temperature of 1 kg of sludge dewatering cake to 100°C is as follows.

At this time, since the indoor temperature is measured by the temperature of the air, for the explanation of this example, assuming the indoor temperature is 20℃ and the indoor volume is 1㎥, specific heat of air = 0.242 cal/g·℃, air Specific gravity = 1.2 kg/㎥, indoor air weight = 1.2 kg/㎥ * 1 ㎥ = 1.2kg = 1,200 g.

Therefore, the indoor maintenance temperature should be 259.7℃.

In summary, in order to raise the temperature of 1kg of sludge dehydration cake to 100℃, the internal temperature of the preheating furnace must be 259.7℃.

As shown in Figures 1 to 4, the drying equipment 130 receives the sludge dehydration cake preheated by the preheating equipment 120, dries it by indirect drying, and discharges it. It has an internal volume that can accommodate capacity, an inlet and an outlet for inputting and discharging the sludge dehydration cake on one side and the other, and is equipped with a flow structure that allows the heat medium oil to flow along the circumference to dry the sludge dehydration cake preheated by the heat of the heat medium oil. A drying furnace 131 that rotates forward or reverse with the driving force of a motor and crushes the sludge dehydration cake in the drying furnace 131 while transporting it along the inside of the drying furnace 131, and an agitator 132 that helps dry the sludge dehydration cake. ), a heat oil boiler 133 that circulates and supplies heat oil at a constant temperature along the circumference of the drying furnace 131, and the weight and drying process of the sludge dehydration cake that is input and filled into the drying furnace 131. It is configured to include a plurality of load cells 134 that measure the weight of the sludge dewatering cake.

The drying furnace 131 has a shape such as a general drum or box having a certain internal volume and an inlet and an outlet on one side and the other. The inlet has a structure that communicates with the outlet of the preheater, and the outlet is a driving cylinder (139). ) has a structure that opens and closes according to the operation of. Accordingly, the preheated sludge dewatering cake transported along the conveyor belt 111 is input through the inlet, and the dried sludge that has been dried under certain conditions is discharged through the outlet.

Meanwhile, the drying furnace 131 has a flow structure that allows heat medium oil to circulate around its circumference. That is, the drying furnace 131 is configured to have a flow line through which heat medium oil can circulate between its inner and outer surfaces. Since this structural relationship is general, detailed description thereof will be omitted. In this way, the drying furnace 131 is heated by the heat medium oil that circulates around the perimeter of the drying furnace 131, and the sludge dehydration cake is indirectly dried due to the heat.

The agitator 132 crushes the sludge dehydration cake in the drying furnace 131 while transporting it along the inside of the drying furnace 131 to help dry the sludge dehydration cake, and when drying is completed under certain conditions, the dried sludge is discharged through the discharge port. As such, a drive shaft 136 connected to the motor 135, a plurality of connecting rods 137 protruding outwardly of the driving shaft 136, and a plurality of blades provided at each end of the plurality of connecting rods 137 ( 138). On the other hand, when the blade 138 rotates forward by the motor 135, it crushes the sludge dewatering cake while transporting it along the inside of the drying furnace 131 to help dry the sludge dehydration cake, and when rotating reversely, drying is completed under certain conditions. It has a shape that moves the dried sludge toward the discharge port and discharges it through the discharge port.

The heat medium oil boiler 133 circulates and supplies heat medium oil at a constant temperature along the perimeter of the drying furnace 131, and can be configured in the configuration of a general boiler.

The plurality of load cells 134 indirectly measure the weight of the sludge dehydration cake being filled by entering into the drying furnace 131 and the weight of the sludge dehydration cake during the drying process, and are mounted on several outer surfaces of the drying furnace 131. It is installed in several places (for example, 4 places). That is, the plurality of load cells 134 measure the total weight of the drying furnace 131, including the sludge dewatering cake filled therein, and dry in an indirect manner by subtracting the weight of the drying furnace 131 itself from the measured value. The weight of the sludge dehydration cake filled into the furnace 131 and the weight of the sludge dehydration cake during the drying process are measured. Here, the total weight of the drying furnace 131 can be calculated by averaging the values measured by a plurality of load cells 134.

The deodorizing facility 140 receives and deodorizes by-products (water vapor, harmful gases, fine dust, etc.) generated from the preheating facility 120 and drying facility 130 as described above, and removes the by-products from the second blower 128. It is configured to be supplied and deodorized with the blowing power of ). This deodorizing facility 140 is configured in a general manner applied in the industry, but is preferably constructed in a wet scrubber manner.

The control panel 150 controls the operation of the transfer equipment 110, preheating equipment 120, and drying equipment 130 as described above, and includes a preheating logic unit and a drying logic unit.

As shown in FIG. 5, the preheating logic unit measures the weight of the sludge dehydration cake to be filled using a plurality of load cells 134 so that only the sludge dehydration cake of the set weight is input into the drying furnace 131, It is configured to control the operation of the sludge storage tank, transfer facility 110, first blower 124, and magnetron 122 according to the measured value. Meanwhile, the preheating logic unit measures the internal temperature of the preheating furnace 121 or the temperature of the conveyor belt 111 of the transfer equipment 110 within the preheating furnace 121 so that the sludge dewatering cake is preheated to the set temperature, and calculates the temperature according to the measured value. It is desirable to control the operation of the magnetron 122 accordingly.

Specifically, the preheating logic unit starts in a closed state in which the outlet of the sludge storage tank storing the sludge dewatering cake is closed (S502), and then operates the first blower 124 of the preheating furnace 121 (S504). , the magnetron 122 is operated to heat the preheating furnace 134 (S506). Then, it is determined whether the measured temperature of the inside of the preheating furnace 121 or the conveyor belt 111 of the transfer equipment 110 within the preheating furnace 121 is within the set value range (S508) , If it is within the set value range (e.g., YES), open the discharge port of the sludge storage tank (S510), operate the conveyor belt 111 of the transfer equipment 110 (S512), and inject the sludge dewatering cake into the drying furnace 131. Fill. However, in S508, if the measured temperature of the conveyor belt 111 is not within the set value range (NO), the process returns to S504 and proceeds with the next procedure. Meanwhile, in S508, the set value range is preferably set to ±1°C of the set temperature, and the temperature of the conveyor belt 111 or the preheating furnace 121 is set so that the preheating temperature of the sludge dewatering cake is 50 to 100°C. It is desirable to set the internal temperature of .

Afterwards, the total weight of the drying furnace 131 is measured to determine whether the measured filling weight of the sludge dewatering cake charged into the drying furnace 131 is equal to the set value (S514), and the measured filling weight is equal to the set value. If the same as (e.g., YES), the discharge port of the sludge storage tank is closed, the operation of the conveyor belt 111 is stopped (S516), and the operation of the first blower 124 and the magnetron 122 is stopped to operate the preheating furnace 134. It is desirable to stop blowing and heating (S518), and if the measured fill weight is not the same as the set value (NO), return to S510 and proceed with the next procedure.

As shown in FIG. 6, the drying logic unit heats the drying furnace 131 with the heat of heat medium oil while the outlet of the drying furnace 131 is closed, and operates the stirrer 132 to dry the sludge dehydration cake, It is configured to measure the weight loss of the sludge dewatering cake using a plurality of load cells 134, and to control the operation of the stirrer 132, the heat oil boiler 133, and the drying furnace 131 according to the measured value.

Specifically, the drying logic unit starts in a closed state in which the preheated sludge dehydration cake in the drying furnace 131 is filled to a set weight and the outlet of the drying furnace 131 is closed (S602), and then the heat medium oil is The boiler 133 is operated (S604) to heat the drying furnace 131 by heating the heat medium oil, and the stirrer 132 of the drying furnace 131 is operated in the forward rotation direction to dry the sludge dehydration cake (S606). . While performing this process, the temperature of the heat medium oil is measured to determine whether the measured temperature is within the set value range (S608). If it is within the set value range (e.g., YES), the agitator 132 of the drying furnace 131 is rotated in the forward direction. It is dried by continuously operating, and if the measured temperature of the heat medium oil is not within the set value range (No, NO), it returns to S604 and performs the process of heating the heat medium oil. Meanwhile, in S608, it is desirable to set the set value range to ±1°C of the set temperature.

Afterwards, the total weight of the drying furnace 131 is measured, and it is determined whether the measured weight loss of the sludge dehydration cake, which is reduced as it is put into the drying furnace 131 and dried, is the same as the set value (S610), and the measured weight loss is determined. If the weight is equal to the set value (e.g., YES), the agitator 132 of the drying furnace 131 is operated in the reverse direction (S612), and the operation of the heat oil boiler 133 is stopped (S614) to heat the heat oil. Stop, open the outlet of the drying furnace 131 (S616), discharge the dried sludge through the outlet, and if the measured weight loss is not the same as the set value (No, NO), return to S606 and program to proceed with the next procedure. desirable.

In the above, the technical details of the sludge indirect drying system of this invention are described together with the accompanying drawings, but this is an exemplary explanation of the best embodiment of this invention. Therefore, this invention is not limited to the embodiments described above, and it is obvious to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention, and such modifications Examples or modifications may also fall within the scope of the claims of this invention.

100: System 110: Transfer facility
120: preheating equipment 130: drying equipment
140: Deodorization facility 150: Control panel
160: Water treatment facility

Claims (7)

A transfer facility for transferring the sludge dehydration cake in the sludge storage tank, a preheating facility for preheating the sludge dehydration cake transported along the transfer facility, and the sludge dehydration cake preheated by the preheating facility is supplied, dried by an indirect drying method, and discharged. An indirect sludge drying system comprising a drying facility that receives and deodorizes by-products generated from the preheating facility and the drying facility, and a control panel that controls the operation of the transfer facility, preheating facility, and drying facility,
The preheating equipment is arranged in a form that seals a part of the transfer equipment, forming a certain space in the upper part of the part, and has an inlet and an outlet for the inlet and outlet of the sludge dewatering cake on one side and the other, A magnetron in communication with the preheating furnace to preheat the sludge dehydration cake by outputting a microwave within the preheating furnace, an exhaust hood in communication with the preheating furnace for discharging by-products generated during preheating of the sludge dehydration cake toward the deodorization facility, It includes a blower that is connected to the preheating furnace and blows the airflow in the preheating furnace toward the outlet and the exhaust hood, and a plurality of temperature sensors that measure the internal temperature of the preheating furnace or the temperature of the transfer equipment in the preheating furnace. do,
The drying facility has an internal volume that can accommodate a certain amount of preheated sludge dehydration cake, an inlet and an outlet for inputting and discharging the sludge dehydration cake on one side and the other, and is equipped with a flow structure that allows heat medium oil to flow along the circumference. A drying furnace for drying the sludge dehydration cake preheated by the heat of the heat medium oil, and rotating forward or reverse with the driving force of a motor, crushing the sludge dehydration cake in the drying furnace while transporting it along the inside of the drying furnace to help dry the sludge dehydration cake. A stirrer, a heat medium oil boiler for circulating and supplying the heat medium oil at a constant temperature along the perimeter of the drying furnace, and measuring the weight of the sludge dehydration cake that is filled by entering the drying furnace and the weight of the sludge dehydration cake during the drying process. A sludge indirect drying system comprising a plurality of load cells. In claim 1,
The control panel includes a preheating logic unit and a drying logic unit,
The preheating logic unit measures the weight of the sludge dehydration cake filled using the plurality of load cells so that only the sludge dehydration cake of the set weight is input and filled inside the drying furnace, and the sludge storage tank, transfer equipment, and blower are operated according to the measured value. and controls the operation of the magnetron,
The drying logic unit heats the drying furnace with the heat of the heat medium oil while the outlet of the drying furnace is closed, operates the stirrer to dry the sludge dehydration cake, and measures the weight loss of the sludge dehydration cake using the plurality of load cells. , Sludge indirect drying system, characterized in that the operation of the agitator, heat oil boiler, and drying furnace is controlled according to the measured values. In claim 2,
The preheating logic unit measures the internal temperature of the preheating furnace or the temperature of the transfer equipment within the preheating furnace so that the sludge dehydration cake is preheated to a set temperature, and controls the operation of the magnetron according to the measured value. Indirect drying system. In claim 3,
Sludge indirect drying system, characterized in that the internal temperature of the preheating furnace or the temperature of the transfer equipment within the preheating furnace is set so that the preheating temperature of the sludge dewatering cake is 50 to 100 ° C. In claim 3 or claim 4,
The preheating logic unit starts in a closed state in which the outlet of the sludge storage tank storing the sludge dewatering cake is closed (S502), then operates the blower (S504), operates the magnetron to heat the interior of the preheating furnace, and (S506), using the plurality of temperature sensors, it is determined whether the temperature of the inside of the preheating furnace or the conveyor belt of the transfer equipment within the preheating furnace is within the set value range (S508), and if it is within the set value range, the sludge storage tank Open the discharge port (S510), operate the conveyor belt of the transfer equipment (S512), and fill the sludge dewatering cake by inserting it into the drying furnace. If the measured temperature is not within the set value range, return to S504 and proceed with the subsequent procedure. After that, the total weight of the drying furnace is measured to determine whether the measured filling weight of the sludge dewatering cake charged by entering into the drying furnace is equal to the set value (S514). If the measured filling weight is equal to the set value, the sludge The discharge port of the storage tank is closed and the operation of the conveyor belt is stopped (S516), the operation of the blower and the magnetron is stopped to stop blowing and heating in the preheating furnace (S518), and the measured filling weight is not equal to the set value. Otherwise, the sludge indirect drying system is programmed to return to S510 and proceed with the subsequent procedure. In claim 2,
The drying logic unit starts in a closed state in which the preheated sludge dehydration cake in the drying furnace is filled to a set weight and the discharge port of the drying furnace is closed (S602), and then the heat medium oil boiler is operated (S604) to remove the heat medium. The drying furnace is heated through oil heating, and the stirrer is operated in a forward rotation direction to dry the sludge dehydration cake (S606). While performing the drying process, the temperature of the heat medium oil is measured to determine whether the measured temperature is within the set value range. In judgment (S608), if the measured temperature is within the set value range, the stirrer is continuously operated in the forward rotation direction to dry, and if the measured temperature of the heat medium oil is not within the set value range, the process of heating the heat medium oil is performed by returning to S604. Then, the total weight of the drying furnace is measured to determine whether the measured weight loss of the sludge dewatering cake lost as it is dried inside the drying furnace is equal to the set value (S610). If the measured weight loss is equal to the set value, the Operate the stirrer in the reverse rotation direction (S612), stop operation of the heat medium oil boiler (S614) to stop heating the heat medium oil, open the outlet of the drying furnace (S616), and discharge the dried sludge through the outlet, Sludge indirect drying system, characterized in that it is programmed to return to S606 and proceed with the subsequent procedure if the measured weight loss is not the same as the set value. In claim 1 or claim 2,
The sludge indirect drying system is characterized in that the exhaust hood further includes an electromagnetic wave exposure blocking net at an end.