KR102607591B1 - Thermal desorption device for sewage sludge fuel coal having a baffle - Google Patents

Abstract

The present invention is provided with a mesh conveyor that continuously transfers fuel coal inputted to the front end of a body portion having an internal space to the rear end, and a heat medium supply pipe extending along the longitudinal direction inside the body portion to continuously heat treat the transported fuel coal. It provides a thermal desorption device for sewage sludge fuel coal, which includes at least one stirring unit in contact with the top of the mesh conveyor, so that the transported fuel coal is agitated up and down.

Description

Thermal desorption device for sewage sludge fuel coal having a stirring configuration {Thermal desorption device for sewage sludge fuel coal having a baffle}

The present invention relates to a thermal desorption device for removing odor from sewage sludge fuel coal. More specifically, it supplies heat to sewage sludge fuel coal to evaporate internal and external moisture and volatilize and remove odorous substances during transportation and storage of fuel coal. It relates to a thermal desorption device that suppresses possible corruption and odor.

Herein, background technology regarding the present disclosure is provided, and does not necessarily mean that it is well-known technology.

Sludge refers to sediment produced when suspended matter in water is separated from liquid through treatment of purified water, sewage, and wastewater. Sewage sludge fuel coal refers to a product manufactured using sewage sludge and turned into fuel.

In general, sewage sludge was disposed of by burying it in the soil or dumping it in the ocean, but as the International Convention on the Prevention of Marine Pollution came into effect, ocean dumping of sewage sludge was banned, and it was treated through composting, fuel conversion, solidification, etc., among which fuel treatment. This method accounts for 48.2% in 2018, and when the dry fuel conversion facility in progress is operated, the fuel conversion rate increases to 58.7%, making it the most significant treatment method.

Sewage sludge fuel coal is similar in quality and characteristics to wood pellets used as co-combustion fuel in power plants, so it is an alternative fuel that can replace wood pellets that rely on imports. The power generation capacity of sewage sludge solid fuel increased from 282,542 MWh in 2015 to 338,143 in 2019. As the number of MWh increases, there is a trend of expanding the use of sewage sludge fuel coal in power plants.

In addition, according to the carbon incorporation strategy, the demand for new and renewable energy is expected to increase as the main energy supply source is shifted from fossil fuels to new and renewable energy, and among new and renewable energy, solar energy and wind power, which have high production instability and uncertainty, are expected to increase. Compared to other fuels, sewage sludge solid fuel has the advantage of stable supply.

In the past, bad odors were generated during the storage and drying of sewage sludge, which led to problems such as air pollution and civil complaints, so technology for treating odors generated during processes such as drying of sewage sludge and turning it into fuel was advanced.

However, there has been no application of technology to reduce odor generated from sewage sludge fuel coal, and its use is being discouraged due to problems such as civil complaints due to odor and air pollution. Therefore, the need for a thermal desorption device to solve these problems is emerging.

Conventionally, when fuel coal is piled up and transported on a mesh conveyor, thermal desorption of fuel coal close to the heat medium supply pipe is excessive, and thermal desorption of fuel coal distant from the heat medium supply pipe is insufficient, which may reduce homogeneity. If thermal desorption is insufficient, the odor is not removed, and secondary effects such as increased heat and durability are also insufficient. If thermal desorption is excessive, a carbonization odor occurs, which increases complex odor and increases the risk of fire. Product yield decreases and economic feasibility decreases.

In addition, fine dust generated during the injection of fuel coal or in the process of transferring each stage was not smoothly removed, resulting in a decrease in product homogeneity and a decrease in operational efficiency by shortening the maintenance cycle of the mesh conveyor.

In addition, when fuel coal is put into the thermal desorption device, it can be transported in piles ranging from 2 to 3 cm to a maximum of 6 to 7 cm, depending on the degree of adjustment of the equal distribution control plate. It is mainly operated in piles at a height of 2 to 3 cm. As shown in Figures 1 and 2, when the fuel coal is transferred, the fuel coal located close to the heat medium supply pipe undergoes excessive thermal desorption due to direct high-temperature heat supply, and the fuel coal located away from the heat medium supply pipe or located in the middle undergoes indirect heat transfer depending on the internal air temperature. Heat supply may result in insufficient thermal desorption, reducing homogeneity. Because the quality of fuel coal is not consistent, bad odors are not completely removed, and secondary effects such as increased heat, improved storability and durability are also reduced.

In order to solve the above problems, the present invention seeks to provide a thermal desorption device for sewage sludge fuel coal that can form turbulence inside the thermal desorption device by injecting high temperature recirculated air into the bottom or top of the mesh conveyor.

In addition, in order to solve the above problems, the present invention provides a stirrer (baffle) inside the thermal desorption device that can turn and mix the fuel coal being transported on the mesh conveyor to enable proper mixing, thereby ensuring uniform quality. The aim is to provide a thermal desorption device for sewage sludge fuel coal capable of producing fuel coal.

In addition, in order to solve the above problems, the present invention consists of a mesh conveyor with a specific mesh size, so that fine dust is smoothly discharged to the bottom of the mesh conveyor, maximizing the effect of turbulence and agitation and minimizing the defect rate and departure rate of fuel coal. The object is to provide a thermal desorption device for sewage sludge fuel coal.

However, the objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those skilled in the art from the description below.

The present invention is provided with a mesh conveyor that continuously transfers fuel coal inputted to the front end of a body portion having an internal space to the rear end, and a heat medium supply pipe extending along the longitudinal direction inside the body portion to continuously heat treat the transported fuel coal. It provides a thermal desorption device for sewage sludge fuel coal, which includes at least one stirring unit in contact with the top of the mesh conveyor, so that the transported fuel coal is agitated up and down.

In addition, the stirring unit is in the form of a plate and is provided at an angle so that the transported fuel coal can climb up the surface of the stirring unit.

In addition, the height of the stirring unit, measured as the vertical distance from the top of the mesh conveyor to the top of the stirring unit, is characterized in that it is provided at a level of 1/2 to 1 time the height of the fuel coal being transported.

Additionally, V-shaped grooves are further provided at both ends of the top of the stirring unit.

In addition, both sides of the stirring unit are characterized in that they are bent at an angle of 5° to 15° in the opposite direction of the mesh conveyor.

The thermal desorption device according to the present invention can produce thermally desorbed fuel coal of constant quality by uniformly supplying heat to the input fuel coal, and significantly reduces the defect rate and departure rate of thermal desorption products, providing excellent economic efficiency. In addition, while the odor removal effect is excellent, secondary effects such as increased heat and durability can also be obtained.

Figure 1 shows problems with conventional thermal desorption devices.
Figure 2 shows images of fuel coal with insufficient, moderate, and excessive thermal desorption.
Figures 3 to 7 show a thermal desorption device according to an embodiment of the present invention.

All technical and scientific terms used in this specification have the same meaning as generally understood by those skilled in the art, unless otherwise specified. Additionally, throughout this specification and claims, unless otherwise specified, the terms "comprise", "comprises", and "comprising" mean including the stated article, step or group of articles, and steps, and any other It is not used in the sense of excluding an object, step, or group of objects or group of steps.

Before describing the present invention in detail below, it is understood that the terms used in this specification are only for describing specific embodiments and are not intended to limit the scope of the present invention, which is limited only by the scope of the appended claims. shall.

Meanwhile, various embodiments of the present invention may be combined with any other embodiments unless clearly indicated to the contrary. Any feature indicated as being particularly preferred or advantageous may be combined with any other feature or feature indicated as being preferred or advantageous. Hereinafter, embodiments of the present invention and effects thereof will be described with reference to the attached drawings.

The thermal desorption device according to an embodiment of the present invention removes bad odors by thermally desorbing fuel coal manufactured in the form of pellets with an average diameter (D) of 6 to 20 mm and an average length (L) of 10 to 40 mm using sewage sludge. As a device that incidentally provides the effect of increasing heat and durability, it is a mesh that continuously transports the fuel coal 1 inserted into the front end of the body 10 having an internal space to the rear end, as shown in the side view of FIG. 3. A conveyor 20 is provided, and is configured to include a heat medium supply pipe 30 that extends along the longitudinal direction inside the body portion and continuously heat-treats the transported fuel coal.

In addition, the thermal desorption device is further provided with at least one air inlet 40 at the top or bottom of the mesh conveyor 20, as shown in the side view of FIG. 4, so that turbulence is formed in the internal space of the body 10. Make it possible.

In addition, the thermal desorption device further includes at least one stirring part 50 in contact with the top of the mesh conveyor 20, as shown in the side view of FIG. 5, to provide an upward and downward stirring effect of the transported fuel coal. The stirring unit 50 is not transported along the mesh conveyor 20 but is fixed at a specific position through a separate fixing member (not shown).

Since the upper end of the mesh conveyor and the lower end of the stirring unit are in contact with each other at a distance that prevents fuel coal from passing through, the fuel coal transported on the mesh conveyor is lifted to the top via the fixed stirring unit, and is driven by the fuel coal that is continuously transferred. As it is pushed, it passes over the top of the agitation unit and falls into the mesh conveyor. More specifically, the separation distance is set to 1/2 or less of the fuel coal diameter. For example, if the fuel coal diameter is 9mm, the separation distance is set to 1mm to 4mm to minimize equipment failure factors by minimizing friction between the agitator and the mesh conveyor. And the stirring efficiency can be maximized. If the separation distance is greater than the above range, the lowest fuel coal being transported along the mesh conveyor cannot pass the baffle and remains in that position, resulting in excessive thermal desorption and the risk of fire. Additionally, as pieces of fuel coal, etc. get caught in the agitator and the mesh conveyor, the separation distance between the baffle and the mesh conveyor increases, which can worsen the above-mentioned problems.

The body portion 10 is a rectangular member with a certain internal space, and serves to heat-treat the fuel coal using the heat generated from the heat medium supply pipe 30 while allowing the fuel coal to be accommodated in the internal space. do.

One side of the front end of the body portion 10 is provided with a fuel coal inlet 110 through which fuel coal is input, and the other side of the front end is provided with a gas outlet 120 through which gas generated during thermal desorption of fuel coal can be discharged to the outside. It is done. In addition, on one side of the rear end of the body 10, a fuel coal outlet 130 is provided for discharging fuel coal from which heat treatment has been completed and the odor has been removed to the outside.

The mesh conveyor 20 is a plate-shaped member having a mesh shape with pores formed on the plate surface, and moves circularly while forming a certain trajectory by driving a mesh conveyor motor (not shown) provided on one side to transport the fuel coal seated on the upper surface. will be transported.

The mesh conveyor 20 is formed in the form of a mesh with pores formed on the plate surface so that fine dust generated from fuel coal is discharged to the bottom of the mesh conveyor through the mesh, smoothly passes through the turbulent flow formed inside the device, and supplies heat evenly to the fuel coal. am.

One feature is that the mesh size of the mesh conveyor 20 is 0.2 cm to 1 cm. As shown in cases where the mesh size is less than 0.2cm, fine dust generated during the injection of fuel coal or in the process of transferring each stage is not smoothly removed and the mesh network is clogged, which hinders uniform temperature distribution due to turbulence and reduces product homogeneity. There is a problem in that the maintenance cycle of the mesh conveyor is shortened and operational efficiency is reduced. If the mesh size exceeds 1cm, fuel coal passes through the mesh net, falls on the bottom of each stage of the thermal desorption device, and accumulates, causing frequent maintenance cycles and product loss, which reduces economic efficiency.

When the mesh size is preferably set to 0.5 cm to 0.7 cm, the turbulence formation effect caused by the air injection port is optimized, as shown in the experimental example described later, and heat is uniformly supplied to the input fuel coal, thereby producing thermally desorbed fuel coal of constant quality. Can be produced with minimum defect rate.

The heat medium supply pipe 30 is a member extending along the length of the body 10 to heat-treat the fuel coal introduced into the body 10 through the fuel coal inlet 110 to remove bad odors. There is no limitation with respect to the medium that supplies heat. The heat medium releases heat while moving along the supply pipe, and the heat medium that releases heat can be recovered by a heat exchanger, heated, and then re-supplied.

The air injection port 40 is configured to inject air into the body portion 10 to form turbulence, and is provided to inject air diagonally toward the fuel coal in the direction of travel of the fuel coal. Preferably, the air is injected obliquely at an angle of 10° to 60° from the ground horizon, and more preferably at an angle of 20° to 40°. If the injection angle (θ ₁ ) exceeds 60°, the fuel coal is shaken by the force of direct injection into the fuel coal, and at this time, fuel coal escapes the mesh conveyor, causing a problem of reduced product production. If it is less than 10°, the fuel coal will shake. In this case, there is a problem where air flows in one direction and turbulence does not form up and down.

The air inlet 40 is provided at least one at the top or bottom of the mesh conveyor 20, and when at least one is provided at the top and bottom, the air inlet 410 is provided at the top and the air inlet 410 is provided at the bottom. Air inlets 420 are provided on different vertical cross-sections of the body portion 10. For example, when two air inlets 40 are provided at the top and two at the bottom, they are provided in a zigzag pattern at the bottom, top, bottom, and top along the moving direction of the mesh conveyor 20.

When two or more air inlets 40 are provided, the distance D ₁ between the air inlets can be appropriately selected according to the facility capacity corresponding to the length of the mesh conveyor. For example, if the length of the mesh conveyor 20 is 3 m or more, it is recommended that air inlets be provided at intervals of 50 to 150 cm. If the air inlet spacing is narrower than the above spacing and the water volume increases, the temperature inside the thermal desorption device decreases, which increases the thermal desorption processing time and increases the cost, which reduces economic efficiency. If the air inlet spacing is wider than the above spacing, turbulence is not formed. Therefore, there is a problem that the temperature inside the thermal desorption device is not uniform and the homogeneity of the produced fuel coal is reduced.

The air injected through the air inlet 40 may be recirculated air that reuses the gas discharged from the gas outlet 120. When recirculating air is injected, the temperature inside the thermal desorption device can be effectively prevented from falling when air is injected, and economic efficiency is improved because the injected air does not need to be heated separately.

The thermal desorption device having a turbulent flow forming structure as described above can produce thermally desorbed fuel coal of constant quality by uniformly supplying heat to the input fuel coal, and significantly reduces the defect rate of thermal desorption products, providing excellent economic efficiency. The defect rate (insufficient + excessive) of the fuel coal discharged according to the presence or absence of turbulence and the air injection angle (θ ₁ ) through the air inlet and the recovery rate relative to the weight of the injected fuel coal (including the amount of fuel coal released and the amount of moisture volatilized during thermal desorption) were measured. The results are shown in Table 1 below. At this time, the mesh size of the mesh conveyors was all the same at 0.6cm.

division Injection angle (°) defect rate recovery rate moderation Inadequate excess Air injection - 60% 20% 20% 89% Air injection O 5 64% 18% 18% 88% 10 96% 2% 2% 87% 20 97% 1.5% 1.5% 88% 30 99% 0.5% 0.5% 87% 40 97% 1.5% 1.5% 87% 60 95% 2.5% 2.5% 85% 70 70% 15% 15% 79%

As shown in Table 1 above, when air was not injected into the thermal desorption device or when air was injected at an angle of less than 10° (5°), turbulence was not formed and the product defect rate was around 40%, and at angles exceeding 60° When air was injected at (70°), the recovery rate dropped significantly to 79%, and the defect rate was also high at 30%. When turbulence is formed at the injection angle according to the present invention, the defect rate is excellent at 5% or less. In particular, when air is injected at an angle of 20° to 40°, the defect rate is very excellent at 3% or less.

When air is injected into the thermal desorption device at an angle of 30° to form a turbulent flow, the results of measuring the product defect rate and recovery rate according to the mesh size of the mesh conveyor are shown in Table 2 below.

Mesh size (cm) defect rate recovery rate moderation Inadequate excess 0.1 70% 15% 15% 87% 0.2 97% 1.5% 1.5% 88% 0.5 99% 0.5% 0.5% 87% 0.7 99% 0.5% 0.5% 87% 1.0 97% 1.5% 1.5% 86% 1.2 86% 7% 7% 80% 2.0 90% 5% 5% 72%

As shown in Table 2, when the mesh size is less than 0.2 cm (0.1 cm), even if turbulence is formed by injecting air at the optimal injection angle, thermal desorption is not performed properly, resulting in a high defective rate, and when the mesh size exceeds 1.0 cm (1.2 cm), the defect rate is high. cm, 2cm), it can be seen that even if air is injected at the optimal injection angle to form turbulence, the recovery rate is low and the economic feasibility is significantly reduced. When the mesh size is 0.2cm to 1.0cm, the thermal desorption treatment efficiency is excellent with a turbulence forming effect and a defect rate of less than 3%. When the mesh size is 0.5cm to 0.7cm, the defective rate is less than 1%, which optimizes the turbulence forming effect. You can see that

The stirring unit 50 is in the form of a plate with a surface as shown in the front view of FIG. 6, and the lower end is provided in contact with the upper end of the mesh conveyor 20, and the surface of the stirring unit is inclined so that the transported fuel coal can ride up. It is well equipped. More specifically, the stirring angle (θ ₂ ) formed between the upper surface of the mesh conveyor and the surface of the stirring unit is 10° to 45°. If the stirring angle of the stirring part is less than 10°, the stirring efficiency decreases, and if the stirring angle exceeds 45°, more fuel coal escapes to the left and right of the mesh conveyor due to the stacking phenomenon, and the recovery rate decreases. Preferably, the stirring angle (θ ₂ ) is 10° to 30°.

In Figure 6, the surface of the stirring part is shown as being square, but the shape of the surface can be provided without limitation as long as it includes a surface and the lower end is in contact with the top of the mesh conveyor. In addition, even if the surface has irregularities or holes in all or part of it, if it can be recognized as a plate at the level of a person skilled in the art, it is considered to be a surface.

Additionally, as shown in the plan view of FIG. 7, the surface of the stirring unit may be provided perpendicular to the moving direction of the mesh conveyor (FIG. 7A) or may be provided not perpendicular (FIG. 7B).

In addition, the stirring unit 50 has an end that contacts the top of the mesh conveyor bent in the moving direction of the mesh conveyor, thereby preventing damage due to friction when the mesh conveyor moves. In addition, as shown in Figure 6b, V-shaped grooves may be further provided at both ends of the top of the stirring unit 50, and as shown in Figure 7c, both sides are angled 5° to 15° in the opposite direction of the moving direction of the mesh conveyor. It is provided in a bent shape and has the effect of gathering fuel coal to the center of the mesh conveyor when it passes over, minimizing the phenomenon of fuel coal falling off to the left and right of the mesh conveyor and increasing stirring efficiency.

The height (d) of the stirrer 50, measured as the vertical distance from the top of the mesh conveyor 20 to the top of the stirrer 50, is set at 1/2 to 1 time the height of the fuel coal being transported. If it is lower than the above range, the mixing efficiency of up and down is significantly reduced, and if it is higher than the above range, the fuel coal may fall outside the conveyor due to a stacking phenomenon, and the falling shock that occurs when lifting and falling may break the fuel coal and generate fine dust and fragments. , problems such as reduced yield may occur. Preferably, it is provided at a level of 3/5 to 3/4 times the height of the fuel coal being transported. The term “level” has the same meaning as “approximately,” and includes an error range of less than 20% because it is difficult to specify a specific value for the piled height of fuel coal due to the nature of transporting a large number of fuel coals in the form of pellets.

When two or more stirring units 50 are provided, the distance D ₂ between the stirring units can be appropriately selected depending on the length of the mesh conveyor 20. For example, when the length of the mesh conveyor 20 is 6 m or more, it is better to provide stirring units at intervals of 2 m to 3 m.

If the height of the stirring part is lower than the above-mentioned height or the spacing between the stirring parts is wider than the above-mentioned spacing, the agitation efficiency is reduced and the uniform heat supply is not possible, which reduces the homogeneity of the product and increases the production of fuel coal with excessive or insufficient thermal desorption. There is a growing problem.

On the other hand, if the height of the stirring part is higher than the above-mentioned height or the gap between the stirring parts is tighter than the above-mentioned spacing, the impact strength generated when the fuel coal that was lifted while passing through the stirring part falls back to the mesh conveyor becomes stronger. , As the impact frequency increases due to frequent stirring, the fuel coal is broken, fragmented, and dusted, reducing the yield of thermally desorbed fuel coal produced, and problems such as mesh network clogging and reduced maintenance cycle due to fine dust occur.

In addition, if the height of the stirring part is higher than the height suggested above, a backlog of transported fuel coal occurs, and the amount of fuel coal falling to the bottom of the device beyond the guides provided on both sides of the mesh conveyor increases, reducing product production and shortening the maintenance cycle. There is a problem with shortening.

The thermal desorption device with the stirring effect as described above can produce thermally desorbed fuel coal of consistent quality by enabling a uniform supply of heat to the transported fuel coal, and significantly reduces the defect rate of thermal desorption products, providing excellent economic efficiency. The results of measuring the product defect rate and recovery rate according to whether or not the product was stirred through the stirrer and the height and spacing of the stirrer are shown in Table 3 below. At this time, the height of the fuel coal being transported was 2 to 3 cm, and the mesh size of the mesh conveyor was all the same at 0.6 cm.

division Height (cm) defect rate recovery rate moderation Inadequate excess Stirring unit - 60% 20% 20% 88% Stirring part O 0.5 70% 15% 15% 87% One 96% 2% 2% 87% 1.5 98% One% One% 89% 2 99% 0.5% 0.5% 88% 3 96% 2% 2% 86% 4 60% 20% 20% 74%

As shown in Table 3 above, if a stirring part is not provided inside the thermal desorption device or the height of the stirring part is lower than 1/2 of the height of the fuel coal (0.5 cm), the stirring effect does not occur sufficiently and the defect rate is about 30%. When it was higher than the height of the fuel coal (4cm), the escape rate due to excessive stirring was very high, so the recovery rate was quite low. When the stirring part is provided at the height according to the present invention (1 to 3 cm), the defect rate is less than 4%, excellent uniformity, and the recovery rate is also high, and the height of the stirring part is 2/3 times the height of the fuel coal (1.5 to 2 cm). It can be seen that the yield is very high, with the defect rate being less than 1%.

Table 4 below shows the results of measuring the product defect rate and recovery rate according to the mesh size of the mesh conveyor when a stirring effect is provided by providing a stirring effect by providing a stirring part with a height of about 2/3 times the height of the fuel coal inside the thermal desorption device.

Mesh size (mm) defect rate recovery rate moderation Inadequate excess 0.1 60% 20% 20% 87% 0.2 96% 2% 2% 87% 0.5 99% 0.5% 0.5% 89% 0.7 99% 0.5% 0.5% 88% 1.0 95% 2.5% 2.5% 85% 1.2 90% 5% 5% 79% 2.0 80% 10% 10% 74%

As shown in Table 4 above, if the mesh size is less than 0.2 cm (0.1 cm), the defect rate is high due to poor thermal desorption even if it provides optimal stirring effect, and if the mesh size is more than 1.2 cm (1.2 cm, 2.0 cm), the defect rate is high. In this case, even if the optimal stirring effect is provided, it can be seen that the recovery rate is relatively low. When the mesh size is 0.2 cm to 1.0 cm, the thermal desorption treatment efficiency is excellent with a stirring effect and a defect rate of less than 5%. When the mesh size is 0.5 cm to 0.7 cm, the defect rate is less than 1%, which optimizes the stirring effect. You can.

The 10m long mesh conveyor has a mesh size of 0.6cm, and is equipped with 5 air inlets at the bottom and 4 at the top in a zigzag pattern at intervals of a, with an injection angle of 30°, and is stirred at the same or similar height as the height of the fuel coal. The results of measuring the product defect rate and recovery rate according to the spacing between the air inlet and the stirring part of the thermal desorption device equipped with three parts at b intervals are shown in Table 5 below.

a(m) b(m) defect rate recovery rate moderation Inadequate excess One 2.5 >99% <0.5% <0.5% 89% 0.5 2.5 >99% <0.5% <0.5% 88% 1.5 2.5 >99% <0.5% <0.5% 87% One 2 >99% <0.5% <0.5% 88% One 3 >99% <0.5% <0.5% 88% 0.25 2.5 96% 2% 2% 76% 1.75 2.5 90% 5% 5% 84% One One 97% 1.5% 1.5% 72% One 4 90% 5% 5% 87%

As shown in Table 5 above, it can be seen that the appropriate spacing between the air inlet and the stirring part also has a significant impact on the defect rate and recovery rate. In other words, it can be seen that if the gap between the air inlet or the stirring part is too tight, the recovery rate is low, and if it is too wide, the defect rate is relatively high.

The features, structures, effects, etc. illustrated in each of the above-described embodiments can be combined or modified for other embodiments by those skilled in the art. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

Claims (5)

A mesh conveyor is provided to continuously transfer fuel coal inputted to the front end of the body portion having an internal space to the rear end,
It includes a heat medium supply pipe extending along the longitudinal direction inside the body portion to continuously heat-treat the transported fuel coal,
Equipped with at least one stirring unit in contact with the top of the mesh conveyor, the transported fuel coal is stirred up and down,
The stirring unit is in the form of a plate, and is provided at an angle of 10° to 30° between the upper surface of the mesh conveyor and the surface of the stirring unit so that the transported fuel coal can climb up the surface of the stirring unit,
The height of the stirring unit, measured as the vertical distance from the top of the mesh conveyor to the top of the stirring unit, is 3/5 to 3/4 times the height of the transported fuel coal,
A thermal desorption device for sewage sludge fuel coal, characterized in that both sides of the stirring unit are bent at an angle of 5° to 15° in the reverse direction of the mesh conveyor.
delete delete According to paragraph 1,
A thermal desorption device for sewage sludge fuel coal further comprising V-shaped grooves at both ends of the top of the stirring unit.
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