A belt-type sludge low-temperature drying equipment using waste heat

Abstract

The present invention discloses a belt-type sludge low-temperature drying device utilizing waste heat, comprising a heat-insulating sealed frame, a filtering and condensing device, a heat-exchanging and evaporating device, and a circulating fan, wherein the heat-insulating and sealed frame defines a left installation area and a right installation area, wherein the left installation area and the right installation area are sealed and separated by a heat-insulating partition, wherein a first through hole is provided at the top of the heat-insulating partition, and a second through hole is provided at the bottom of the heat-insulating partition, wherein the filtering and condensing device is installed in the left installation area, and the heat-exchanging and evaporating device is installed in the right installation area. The present invention separates the condenser in the filtering and condensing device from the heat exchanger in the heat-exchanging and evaporating device by providing a heat-insulating and sealed frame, thereby ensuring that the moisture in the hot and humid air is condensed and liquefied to form humid and cold air, and at the same time ensuring the heat conduction effect, thereby improving energy utilization and reducing costs.

Description

Technical Field

[0001] The invention relates to the technical field of sludge drying, and in particular to a belt-type sludge low-temperature drying device utilizing waste heat. Background Art

[0002] Industrial sludge or municipal sludge (generally refers to sludge produced by domestic sewage treatment plants) generally has a moisture content between 65% and 85% after chemical conditioning and mechanical dehydration. Sludge drying refers to a method of further removing moisture from sludge through various means such as heating and evaporation, thereby reducing the volume of the sludge and facilitating further harmless treatment.

[0003] Sludge drying equipment can be divided into three types according to the contact mode between heat medium and sludge: direct heating type, indirect heating type and direct / indirect combined drying type. According to the process type, it can be divided into five types: fluidized bed drying, belt drying, paddle drying, horizontal rotary drying and vertical disc drying. According to the temperature of the heat medium provided, it can be divided into high temperature (greater than 200℃), medium temperature (100℃~200℃) and low temperature (less than 100℃) sludge drying.

[0004] The existing sludge low-temperature drying equipment is basically similar or the same in principle, usually including dehumidification heat pump sludge low-temperature drying technology and waste heat utilization sludge low-temperature drying technology.

[0005] The principle of low-temperature sludge drying: using different forms of active heat sources or waste heat sources, converting their heat energy through heat exchange devices (indirect contact utilization, the heat source and cold source do not contact the sludge and are not contaminated by the sludge). The heated air is driven by the internal circulation fan and passes through the sludge stacking layer with a certain air permeability, evaporating the moisture in the sludge to form humid hot air, and then enters the condensation area. After the humid hot air is cooled, the water vapor forms condensation and precipitates, and is discharged from the system through the collection and outflow equipment. The condensed air re-enters the heat exchange area and evaporation area, and the cycle continues to evaporate and condense the moisture in the sludge at low temperature.

[0006] Compared with other types of sludge drying technologies, the main advantages of sludge low-temperature drying technology are: 1. The evaporation and drying process of water in the sludge is carried out under low temperature (less than 100°C), and only a very small amount of organic matter in the sludge evaporates from the sludge. The condensed water formed by the equipment is basically pollution-free and can be directly discharged; 2. The medium air used for evaporation and condensation circulates in a strictly closed space and does not diffuse to the outside world. Therefore, no odor is generated during the sludge drying process; 3. In terms of energy utilization, sludge low-temperature drying makes full use of waste heat and waste cold, saving drying costs. Especially in some enterprises with sufficient waste heat, the heat cost of sludge drying is basically zero, and the system only requires a very small amount of mechanical power cost.

[0007] However, the existing sludge low-temperature drying technology also has some disadvantages. For example, when using heat pump technology for sludge low-temperature drying equipment, the system needs to use electricity and energy, and the internal overall heat diffusion and expansion, so it is necessary to add an additional cold source, otherwise the internal circulating hot air will be forced to overflow due to thermal expansion, forming secondary pollution. In addition, based on the structure of the heat pump system, its condenser and heat exchanger are basically placed on one side, so that the condenser and heat exchanger will affect each other, reducing the heat utilization efficiency. In addition, the system uses electrical energy to form an evaporation and condensation temperature difference, and the electricity cost is relatively high. About 3 to 4 kg of water is evaporated per kilowatt-hour, which is equivalent to about 250 kw.h of electricity cost to dry about 82% of the sludge, and the cost is relatively high. The drying efficiency of sludge low-temperature drying equipment using waste heat is relatively poor. Summary of the invention

[0008] In view of the deficiencies of the prior art, the present invention provides a belt-type sludge low-temperature drying equipment that utilizes waste heat, which is used to solve the problems of high cost and low drying efficiency of the sludge low-temperature drying equipment in the prior art.

[0009] To this end, according to an embodiment of the present invention, the belt-type sludge low-temperature drying equipment comprises:

[0010] A heat-insulating sealed frame, wherein the heat-insulating sealed frame defines a left installation area and a right installation area, wherein the left installation area and the right installation area are sealed and separated by a heat-insulating baffle, wherein a first through hole is disposed at the top of the heat-insulating baffle, and a second through hole is disposed at the bottom of the heat-insulating baffle;

[0011] A filtering and condensing device, the filtering and condensing device is installed in the left installation area, the filtering and condensing device comprises a condenser, which is used to condense and liquefy the moisture in the hot and humid air to form humid and cold air;

[0012] a heat exchange evaporation device, the heat exchange evaporation device is installed in the right installation area, the heat exchange evaporation device comprises a heat exchanger arranged at the bottom of the right installation area and a sludge conveyor belt located above the heat exchanger, the heat exchanger receives the wet and cold air condensed by the condenser through the second through hole, and converts the wet and cold air into dry hot air; and

[0013] A circulation fan, wherein the circulation fan is arranged at the top of the left installation area, the air inlet of the circulation fan is connected to the right installation area through the first through hole, and the air outlet of the circulation fan is placed in the left installation area.

[0014] As a further optional solution of the belt-type sludge low-temperature drying equipment, the circulating fan is a medium-pressure centrifugal fan.

[0015] As a further optional solution of the belt-type sludge low-temperature drying equipment, there are multiple medium-pressure centrifugal fans, and the multiple medium-pressure centrifugal fans are evenly spaced along the conveying direction of the sludge conveyor belt.

[0016] As a further optional solution of the belt-type sludge low-temperature drying equipment, the heat-insulating sealed frame is formed by connecting stainless steel square tubes, and the stainless steel square tubes are filled with heat-insulating asbestos.

[0017] As a further optional scheme for the belt-type sludge low-temperature drying equipment, the left installation area is formed with a left first zone, a left second zone, a left third zone, a left fourth zone and a left fifth zone from top to bottom, the circulating fan is arranged in the left first zone, the filtering and condensing device also includes a water collecting tray, and the water collecting tray is located below the condenser. Each of the left second zone, the left third zone and the left fourth zone is provided with at least one group of the condenser and the water collecting tray, and the left fifth zone is connected to the right installation area through the second through hole.

[0018] As a further optional scheme of the belt-type sludge low-temperature drying equipment, a left sixth zone is provided between the left first zone and the left second zone, and a filter is provided in the left sixth zone for filtering particulate matter in the hot and humid air coming out of the circulating fan.

[0019] As a further optional scheme for the belt-type sludge low-temperature drying equipment, the right installation area forms a right first zone, a right second zone, a right third zone and a right fourth zone from top to bottom, the right first zone is connected to the left first zone through the first through hole, the sludge conveyor belt is arranged in the right first zone, the right second zone and the right third zone, and the heat exchanger is arranged in the right fourth zone.

[0020] As a further optional solution of the belt-type sludge low-temperature drying equipment, baffle plates are provided at both ends of the sludge conveyor belt to allow the sludge to be dried to enter the right third zone from the right first zone along the sludge conveyor belt.

[0021] As a further optional solution of the belt-type sludge low-temperature drying equipment, a sludge conveyor is also connected to the output end of the right third zone to convey the dried sludge.

[0022] As a further optional solution of the belt-type sludge low-temperature drying equipment, a sludge extrusion granulator is also provided on the top of the right installation area.

[0023] Beneficial effects of the present invention:

[0024] According to the belt-type sludge low-temperature drying equipment in the above embodiment, the left installation area and the right installation area of ​​the thermal insulation sealing frame are sealed and separated, and the condenser is installed in the left installation area, while the heat exchanger is installed in the right installation area. In this way, the heat exchanger is separated from the condenser, and the influence of the heat diffusion of the heat exchanger on the condensation work of the left installation area is eliminated, and the moisture in the humid hot air is condensed and liquefied to form the effect of humid and cold air. At the same time, the heat diffuses upward, which is more conducive to the heat transfer to the sludge conveyor belt above the heat exchanger in the right installation area, and the heat conduction effect is guaranteed, thereby improving the energy utilization rate, reducing the cost, and improving the drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It shows a front view of a belt-type sludge low-temperature drying device utilizing waste heat provided in accordance with an embodiment of the present invention;

[0027] Figure 2 A side view of a belt-type sludge low-temperature drying device utilizing waste heat provided in accordance with an embodiment of the present invention is shown.

[0028] Description of main component symbols:

[0029] 100-insulated sealed frame; 200-filter condensation device; 300-heat exchange evaporation device; 400-circulating fan; 500-humidity sensor; 600-sludge conveyor; 700-sludge extrusion granulator; 110-left installation area; 120-right installation area; 130-insulated baffle; 210-condenser; 220-water collection tray; 230-filter; 310-heat exchanger; 320-sludge conveyor belt; 330-reducer; 4 10-wind baffle; 111-left first zone; 112-left second zone; 113-left third zone; 114-left fourth zone; 115-left fifth zone; 116-left sixth zone; 121-right first zone; 122-right second zone; 123-right third zone; 124-right fourth zone; 131-first through hole; 132-second through hole; 321-side baffle; 322-first end plate; 323-second end plate; 1000-sludge to be dried. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] Example

[0036] This embodiment provides a belt-type sludge low-temperature drying device that utilizes waste heat.

[0037] Please refer to Figure 1-2 The belt-type sludge low-temperature drying equipment includes a heat-insulating and sealed frame 100 , a filtering and condensing device 200 , a heat exchange evaporation device 300 and a circulating fan 400 .

[0038] The heat-insulating sealed frame 100 defines a left installation area 110 and a right installation area 120, and the left installation area 110 and the right installation area 120 are sealed and separated by a heat-insulating baffle 130, and a first through hole 131 is provided on the top of the heat-insulating baffle 130, and a second through hole 132 is provided on the bottom of the heat-insulating baffle 130. The filter condensation device 200 is installed in the left installation area 110, and the filter condensation device 200 includes a condenser 210, which is used to condense and liquefy the moisture in the humid hot air to form humid cold air. The heat exchange evaporation device 300 is installed in the right installation area 120, and the heat exchange evaporation device 300 includes a heat exchanger 310 arranged at the bottom of the right installation area 120 and a sludge conveyor belt 320 located above the heat exchanger 310, and the heat exchanger 310 receives the humid cold air condensed by the condenser 210 through the second through hole 132, and heats the humid cold air into dry hot air. The circulation fan 400 is disposed at the top of the left installation area 110 , an air inlet of the circulation fan 400 is connected to the right installation area 120 through the first through hole 131 , and an air outlet of the circulation fan 400 is disposed in the left installation area 110 .

[0039] In this way, through the action of the circulation fan 400, a circulating airflow can be formed inside the heat-insulating sealed frame 100. The circulating airflow flows downward from the air outlet of the circulation fan 400 along the left installation area 110 to the bottom of the right installation area 120, and then returns to the air inlet of the circulation fan 400. In the above process, since the left installation area 110 and the right installation area 120 of the heat-insulating sealed frame 100 are sealed and separated, and the condenser 210 is installed in the left installation area 110, and the heat exchanger 310 is installed in the right installation area The installation area 120 separates the heat exchanger 310 from the condenser 210, thereby preventing the heat diffusion of the heat exchanger 310 from affecting the condensation work of the left installation area 110, ensuring that the moisture in the humid hot air is condensed and liquefied to form humid cold air, and at the same time allowing the dry hot air to diffuse upward, which is more conducive to heat transfer to the sludge conveyor belt 320 above the heat exchanger 310 in the right installation area 120, and ensuring the heat conduction effect, thereby improving energy utilization, reducing costs, and improving drying efficiency.

[0040] In addition, since the circulation fan 400 is placed on the top of the left installation area 110, it is convenient for the circulation fan 400 to be assembled, disassembled and inspected later.

[0041] In the embodiment of the present invention, the circulating fan 400 is a medium-pressure centrifugal fan. The function of the medium-pressure centrifugal fan is to provide a certain positive pressure to the left installation area 110, which can enhance the condensation effect, and at the same time form a negative pressure in the right installation area 120 to enhance the evaporation effect. In this way, the drying efficiency of the belt-type sludge low-temperature drying device is improved through the dual enhancement effect of the medium-pressure centrifugal fan.

[0042] It is understandable that in the sludge low-temperature drying technology, the control of the circulating air volume is quite critical. When the circulating air volume is too large, the contact time between the dry hot air and the wet sludge is insufficient, and the moisture brought out is not enough to form saturation, and the temperature difference required for the unsaturated water vapor to reach the dew point condensation is large, so that it cannot condense or the condensation effect is poor after entering the left installation area 110; when the circulating air volume is too small, it is not conducive to improving the drying efficiency of the belt sludge low-temperature drying equipment.

[0043] In this regard, in an embodiment of the present invention, a plurality of the above-mentioned medium-pressure centrifugal fans are provided and are evenly spaced apart along the conveying direction of the sludge conveyor belt 320 .

[0044] Furthermore, a humidity sensor 500, a temperature sensor, a frequency converter, etc. are provided at an appropriate position of the heat-insulating sealing frame 100, for example, at the upper end of the right installation area 120. A plurality of medium-pressure centrifugal fans are connected in parallel, and the air volume of the medium-pressure centrifugal fan is jointly controlled by the humidity sensor 500 and the frequency converter installed at the upper end of the right installation area 120. When the humidity decreases, the circulating air volume is reduced, and when the relative humidity reaches 100%, the circulating air volume is increased. The relative humidity at the upper end of the right installation area 120 is controlled between 97% and 100% to ensure efficient condensation.

[0045] Generally speaking, the wind speed at the inlet and outlet of a medium-pressure centrifugal fan is relatively high. To ensure that the hot and humid air is evenly collected and passes through the left installation area 110, an air distribution baffle 410 is installed at the inlet and outlet of the circulation fan 400 to distribute the air.

[0046] Similarly, wind balancing baffles 410 are provided at both ends of the heat exchanger 310 for balancing the air.

[0047] In an embodiment of the present invention, in order to ensure the thermal insulation and sealing effect of the entire belt-type sludge low-temperature drying equipment, the thermal insulation and sealing frame 100 is composed of a combination of stainless steel square tubes and wall panels, and a sealed thermal insulation inspection door is arranged at an appropriate position. The stainless steel square tubes, wall panels and inspection doors are all filled with thermal insulation asbestos.

[0048] Please refer to Figure 2In the embodiment of the present invention, the left installation area 110 is formed with a left first area 111, a left second area 112, a left third area 113, a left fourth area 114 and a left fifth area 115 from top to bottom, the circulating fan 400 is arranged in the left first area 111, the filtering and condensing device 200 also includes a water collecting tray 220, and the water collecting tray 220 is located below the condenser 210. Each of the left second area 112, the left third area 113 and the left fourth area 114 is provided with at least one set of condensers 210 and water collecting trays 220, and the left fifth area 115 is connected to the right installation area 120 through the second through hole 132.

[0049] In this way, by setting up multiple groups of condensers 210 and water collecting trays 220, it can be ensured that the moisture in the hot and humid air coming out of the circulating fan 400 can be fully condensed and liquefied. At the same time, because each group of condensers 210 and water collecting trays 220 are arranged separately in layers, it can also effectively prevent condensation dripping from affecting the condenser 210 in the lower layer, which is beneficial to extending the service life of the condenser 210.

[0050] It should be noted that the condenser 210 and the water collecting pan 220 can be modularly installed in the left installation area 110 in a detachable manner. Each group of modules includes a condenser 210 and a water collecting pan 220, and each group of modules can be provided with two cold source water inlets and outlets, which are all collected in the water supply and drainage main pipeline at the lower end of the condenser 210. After being collected by the water collecting pan 220 through the water supply and drainage main pipeline, the condensed water can be transmitted to the water seal device discharge system and discharged outside the belt sludge low-temperature drying equipment. If necessary, a collection bucket can be provided to collect and measure the amount of water obtained in the drying process, so as to facilitate the testing of the energy consumption ratio.

[0051] In the embodiment of the present invention, the required cold source can be at 25-35°C, and no lower cold source is required. The cold source comes out directly after entering the condenser 210 without any pollution, so the selection range of the cold source is wide. If there is sufficient available cold source, it can be used directly. If not, a clean water cooling tower can be added next to the belt sludge low-temperature drying equipment according to the required cold source scale. Under the power provided by the cooling circulation pump, the cold source water is condensed and heated, enters the cooling tower to cool down and becomes a new cold source again to enter the condenser 210.

[0052] In addition to the above, a left sixth zone 116 is provided between the left first zone 111 and the left second zone 112 , and a filter 230 is provided in the left sixth zone 116 for filtering particulate matter in the hot and humid air coming out of the circulation fan 400 .

[0053] In this way, by providing the filter 230 , particulate matter that may be brought from the right installation area 120 can be removed to prevent the particulate matter from adhering to the fins of the condenser 210 and reducing its heat transfer efficiency.

[0054] In some specific implementations, the filter 230 may be a medium-efficiency filter, a primary-efficiency filter, or a combination of the two.

[0055] Please refer to Figure 1-2 In the embodiment of the present invention, the right installation area 120 forms a right first area 121, a right second area 122, a right third area 123 and a right fourth area 124 from top to bottom, the right first area 121 is connected to the left first area 111 through the first through hole 131, the sludge conveyor belt 320 is arranged in the right first area 121, the right second area 122 and the right third area 123, and the heat exchanger 310 is arranged in the right fourth area 124.

[0056] In other words, a heat exchanger 310 is arranged in the right fourth zone 124 at the bottom of the right installation zone 120, and three groups of sludge conveyor belts 320 are arranged above the heat exchanger 310. In this way, the combined effect of the heat exchanger 310 and the sludge conveyor belts 320 can ensure that the sludge is well dried.

[0057] Specifically, the three groups of sludge conveyor belts 320 are driven by reducers 330 respectively. Three reducers 330 are used to transmit power to the three layers of sludge conveyor belts 320 respectively. The transmission speed can be adjusted independently. In this way, by adjusting the speed, the sludge can be dried layer by layer and the sludge stacking thickness can be increased layer by layer, thereby increasing the contact time between the dry hot air and the wet sludge, thereby improving the sludge drying efficiency.

[0058] In some specific embodiments, the sludge conveyor belt 320 is a combination of a stainless steel chain steel mesh belt (support) and a pet mesh belt.

[0059] In addition, in order to prevent sludge from overflowing and regulate the routing of sludge, a material blocking plate is provided on the sludge conveyor belt 320 to block the sludge so that the sludge 1000 to be dried can enter the right third zone 123 from the right first zone 121 along the sludge conveyor belt 320 .

[0060] Specifically, the baffle plate includes side baffles 321 arranged on both sides of the sludge conveyor belt 320, a first end plate 322 arranged at one end of the sludge conveyor belt 320, and a second end plate 323 arranged at the other end of the sludge conveyor belt 320, wherein the first end plate 322 is used to prevent the sludge from overflowing from this end, and the second end plate 323 is used to regulate the direction of the sludge so that the sludge can enter the sludge conveyor belt 320 on the lower layer under the restriction of the second end plate 323.

[0061] Please continue to refer to Figure 1 A sludge conveyor 600 is also connected to the output end of the right third zone 123 for conveying dried sludge. At the same time, the sludge conveyor 600 and the material at its output end also play a role in strengthening the sealing of the device.

[0062] In addition, a sludge extrusion granulator 700 is provided on the top of the right installation area 120. The purpose of the sludge extrusion granulator 700 is to increase the contact surface between the sludge and the dry hot air, improve the sludge drying efficiency, and also facilitate the transportation and packaging of the dried sludge. This invention adopts an active feeding sludge extrusion granulator 700, which is fully adapted to sludge with a moisture content of 65% to 85%, and ensures that the feed is evenly distributed in the linear area.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0064] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A belt-type sludge low-temperature drying equipment utilizing waste heat, characterized in that: include: A heat-insulating sealed frame, wherein the heat-insulating sealed frame defines a left installation area and a right installation area, wherein the left installation area and the right installation area are sealed and separated by a heat-insulating baffle, wherein a first through hole is disposed at the top of the heat-insulating baffle, and a second through hole is disposed at the bottom of the heat-insulating baffle; A filtering and condensing device, the filtering and condensing device is installed in the left installation area, the filtering and condensing device comprises a condenser, and is used to condense and liquefy moisture in the hot and humid air to form humid and cold air; a heat exchange evaporation device, the heat exchange evaporation device is installed in the right installation area, the heat exchange evaporation device comprises a heat exchanger arranged at the bottom of the right installation area and a sludge conveyor belt located above the heat exchanger, the heat exchanger receives the wet and cold air condensed by the condenser through the second through hole, and converts the wet and cold air into dry hot air; and A circulation fan, wherein the circulation fan is arranged at the top of the left installation area, the air inlet of the circulation fan is connected to the right installation area through the first through hole, and the air outlet of the circulation fan is placed in the left installation area; the circulation fan is a medium-pressure centrifugal fan; there are multiple medium-pressure centrifugal fans, and the multiple medium-pressure centrifugal fans are evenly spaced along the conveying direction of the sludge conveyor belt; The heat-insulating sealing frame is formed by connecting stainless steel square tubes, and the stainless steel square tubes are filled with heat-insulating asbestos; The left installation area is formed with a left first area, a left second area, a left third area, a left fourth area and a left fifth area from top to bottom, the circulating fan is arranged in the left first area, the filtering and condensing device further comprises a water collecting pan, the water collecting pan is located below the condenser, each of the left second area, the left third area and the left fourth area is provided with at least one group of the condenser and the water collecting pan, and the left fifth area is connected to the right installation area through the second through hole; A left sixth zone is also provided between the left first zone and the left second zone, and a filter is provided in the left sixth zone for filtering particulate matter in the hot and humid air coming out of the circulating fan; The right installation area is formed from top to bottom into a right first area, a right second area, a right third area and a right fourth area, the right first area is connected to the left first area through the first through hole, the sludge conveyor belt is arranged in the right first area, the right second area and the right third area, and the heat exchanger is arranged in the right fourth area; Both ends of the sludge conveyor belt are provided with baffle plates for allowing the sludge to be dried to enter the right third zone from the right first zone along the sludge conveyor belt; A sludge conveyor is also connected to the output end of the right third zone to convey the dried sludge; A sludge extrusion granulator is also arranged on the top of the right installation area.

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