Energy recovery system for clean coal flotation dehydration

Abstract

The utility model provides an energy recovery system for clean coal flotation dehydration, and relates to the technical field of clean coal flotation dehydration equipment. The energy recovery system for clean coal flotation dehydration comprises a centrifugal dehydrator used for treating water-containing clean coal generated by flotation equipment; the centrifugal dehydrator is at least provided with a first output pipe for discharging centrifugate and a second output pipe for discharging dehydrated clean coal; the plate heat exchanger is communicated with the first output pipe; the plate heat exchanger is provided with a first output port for discharging centrifugate after heat exchange; the reagent storage mechanism is communicated with the plate heat exchanger; the reagent storage mechanism is at least provided with a reagent outlet; wherein a circulating communicating pipeline is arranged between the plate heat exchanger and the water jacket layer, a circulating water pump is arranged on the circulating communicating pipeline, and the circulating water pump can drive circulating water to circularly flow between the plate heat exchanger and the water jacket layer, so that the chemical reagent for flotation is heated; the energy utilization rate and the flotation efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the technical field of clean coal flotation and dewatering equipment, specifically to an energy recovery system for clean coal flotation and dewatering. Background Technology

[0002] Flotation is a core step in coal washing, primarily used for separating fine and ultrafine particles. The flotation dewatering process for clean coal is a crucial link in coal flotation processing, aiming to reduce the moisture content of the clean coal, thereby improving product quality and economic efficiency. Common flotation dewatering processes include: high-pressure pressing and air-flow filtration dewatering technologies, two-stage dewatering processes for flotation clean coal, the process of recovering coarse clean coal using a vibrating arc screen and a coal slime centrifuge, and the process of hydrophobic agglomeration centrifugal filtration dewatering of ultrafine flotation clean coal.

[0003] In centrifuge dewatering processes, the centrifuged liquid typically generates waste heat. This waste heat is the result of multiple factors, including mechanical friction and chemical reactions, during the dewatering of clean coal. During the high-speed rotation of the centrifuge, friction between the rotor and the material generates heat, which is transferred to the centrifuged liquid, raising its temperature. Furthermore, the centrifuged liquid may contain chemical substances that may react during dewatering, releasing heat. However, in current technologies, the centrifuged liquid with waste heat is usually directly fed into a filter press for filtration or recovered through sedimentation tanks and bucket elevators, resulting in the waste of energy as the waste heat remains unutilized. Utility Model Content

[0004] This invention addresses the problem in existing technologies where centrifugal liquid is directly fed into other processes for treatment and recycling, resulting in unused residual heat and energy waste. It provides an energy recovery system for clean coal flotation and dewatering that can recover and utilize the residual heat of centrifugal liquid to heat flotation chemical reagents, thereby improving energy utilization and increasing the efficiency of coal washing flotation.

[0005] The technical solution adopted in this utility model is:

[0006] An energy recovery system for coal flotation dewatering includes:

[0007] A centrifugal dewatering machine is used to process water-containing clean coal produced by flotation equipment; the centrifugal dewatering machine has at least a first output pipe for discharging centrifugal liquid and a second output pipe for discharging dewatered clean coal.

[0008] A plate heat exchanger is connected to the first output pipe; and the plate heat exchanger has a first outlet for discharging the centrifugal liquid after heat exchange; and

[0009] A reagent storage mechanism is connected to the plate heat exchanger; and the reagent storage mechanism has at least a reagent outlet.

[0010] A circulation connection pipeline is provided between the plate heat exchanger and the water jacket of the reagent storage mechanism. A circulation water pump is provided on the circulation connection pipeline. The circulation water pump can drive the circulating water to circulate between the plate heat exchanger and the water jacket, thereby heating the floating chemical reagent in the reagent storage mechanism.

[0011] Furthermore, the centrifugal dehydrator includes a centrifuge body and a drive assembly; the centrifuge body is provided with a centrifuge input pipe and a first output pipe and a second output pipe; the drive assembly has at least a motor and a rotating shaft and a rotating drum disposed within the centrifuge body.

[0012] Furthermore, a filter is installed on the connecting pipe between the first output pipe of the centrifugal dehydrator and the plate heat exchanger.

[0013] Furthermore, the plate heat exchanger has at least a fixed clamping plate, on which a first inlet, a second inlet, a second outlet, and a first outlet are provided; the first inlet is connected to the first outlet pipe; the second inlet is connected to the output end of the circulating water pump; and the second outlet is connected to the water jacket of the reagent storage mechanism.

[0014] Furthermore, the plate heat exchanger is provided with a support frame, and a first slide rail and a second slide rail are provided between the support frame and the fixed pressure plate. A movable pressure plate is slidably arranged on the first slide rail and the second slide rail. A hot and cold flow channel and a number of heat exchange plates are provided between the movable pressure plate and the fixed pressure plate.

[0015] Furthermore, the heat exchange plates are made of 316L stainless steel or titanium alloy.

[0016] Furthermore, the reagent storage mechanism is provided with a stirring assembly, which includes a stirring motor disposed outside the reagent storage mechanism, and a stirring shaft and stirring blades disposed inside the reagent storage mechanism.

[0017] Furthermore, a second reagent inlet and a water inlet are provided on the upper outer side of the reagent storage mechanism.

[0018] Furthermore, it also includes:

[0019] The temperature control mechanism includes at least a PLC controller and a temperature sensor; the PLC controller, the temperature sensor, and the circulating water pump are all electrically connected; the temperature sensor is located at the second output port of the plate heat exchanger; the temperature control mechanism can adjust the flow rate of the circulating water pump according to the temperature of the circulating water at the second output port.

[0020] Furthermore, a three-way valve is installed on the connecting pipeline between the second output port and the reagent storage mechanism, and the branch pipe of the three-way valve is connected to the heating system; and the three-way valve is electrically connected to the temperature control mechanism, which can adjust the flow distribution on both sides of the three-way valve according to the temperature of the circulating water at the second output port.

[0021] The beneficial effects of this utility model are:

[0022] 1. This utility model utilizes a plate heat exchanger to recover and utilize the waste heat from the centrifugal liquid produced by the centrifugal dehydrator to heat the circulating water. The circulating water is then circulated between the plate heat exchanger and the water jacket of the reagent storage mechanism via a circulating water pump and connecting pipelines. This preheats the flotation reagents, thereby enhancing their solubility, dispersibility, and interaction with mineral particles, improving flotation efficiency, and realizing the recovery and utilization of waste heat from the centrifugal liquid. This reduces energy waste and lowers the overall energy consumption of the system, solving the problem in existing technologies where the centrifugal liquid is directly sent to other processes for treatment and recovery, resulting in unutilized waste heat and energy waste. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional schematic diagram of the recycling system of Embodiment 1 of this utility model;

[0025] Figure 2 This is a three-dimensional schematic diagram of a centrifugal dehydrator according to an embodiment of the present utility model;

[0026] Figure 3 This is a three-dimensional schematic diagram of a plate heat exchanger according to an embodiment of the present utility model;

[0027] Figure 4 This is a three-dimensional schematic diagram of the circulating water pump according to an embodiment of the present utility model;

[0028] Figure 5 This is a perspective view of the reagent storage mechanism according to an embodiment of the present utility model;

[0029] Figure 6 This is a schematic diagram of the internal structure of the reagent storage mechanism according to an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the recycling system of Embodiment 2 of this utility model.

[0031] Reference numerals: 100-Centrifuge, 110-Centrifuge body, 111-Centrifuge inlet pipe, 112-First outlet pipe, 114-Second outlet pipe, 115-Filter, 120-Drive assembly, 130-First mounting base, 140-Second mounting base;

[0032] 200-Plate heat exchanger, 210-Fixed pressure plate, 211-First inlet, 212-Second inlet, 213-First outlet, 214-Second outlet, 220-Support frame, 230-First slide rail, 240-Second slide rail, 250-Modible pressure plate, 260-Heat exchange plate;

[0033] 300-Circulating water pump, 310-Base, 320-Pump body, 321-Input end, 322-Output end, 330-Filter assembly, 340-Fixing ring;

[0034] 400 - Reagent storage mechanism; 401 - First reagent inlet; 402 - Second reagent inlet; 403 - Water inlet; 404 - Reagent outlet; 410 - Water jacket layer; 411 - Water jacket inlet; 412 - Water jacket outlet; 420 - Stirring assembly; 421 - Stirring motor; 422 - Stirring shaft; 423 - Stirring blades; 430 - Level gauge.

[0035] 500-Three-way valve;

[0036] 600 - Heating system. Detailed Implementation

[0037] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0039] The embodiments of the utility model will now be described in detail with reference to the accompanying drawings.

[0040] Example 1

[0041] In existing flotation dewatering processes using centrifuges, the centrifuged liquid typically generates waste heat. This waste heat is the result of multiple factors, including mechanical friction and chemical reactions, during the clean coal dewatering process. However, in current technologies, the centrifuged liquid containing waste heat is usually directly fed into a filter press for filtration or recovered through sedimentation tanks and bucket elevators. This waste heat is not utilized, resulting in energy waste.

[0042] To address the aforementioned problems in the prior art, this embodiment provides an energy recovery system for clean coal flotation dewatering. This system recovers and utilizes the waste heat carried by the centrifugal liquid generated by the centrifuge during the dewatering process of coal washing flotation. This energy recovery system can recover and utilize the waste heat of the centrifugal liquid to preheat the flotation chemical reagents, thereby improving energy utilization and increasing the efficiency of coal washing flotation. Please refer to... Figures 1-6 The energy recovery system for coal flotation dewatering mainly includes: a centrifugal dewatering machine 100, a plate heat exchanger 200, a circulating water pump 300, and a reagent storage mechanism 400, etc.

[0043] The centrifugal dewatering machine 100 is used in conjunction with flotation equipment to receive high-moisture coal slime or flotation foam coal, perform dewatering operations, output clean coal slime product, and discharge the centrifugal liquid through pipelines. For example... Figure 1 , Figure 2 As shown, the centrifugal dewatering machine 100 mainly includes a centrifuge body 110 and a drive assembly 120. The centrifuge body 110 is generally a horizontal cylindrical shape. A centrifuge inlet pipe 111 is provided at one end of the cylinder for introducing coarse coal slime or flotation foam coal produced by the flotation equipment. A first outlet pipe 112 and a second outlet pipe 114 are provided on the side wall of the cylinder. Simultaneously, a first mounting base 130 and a second mounting base 140 are provided at both ends of the centrifuge body 110, and a drive assembly 120 is provided at the bottom of the first mounting base 130. The drive assembly 120 includes a motor and a reducer. Furthermore, a rotating shaft and a drum, which are connected to the motor and reducer, are provided inside the centrifuge body 110. The drum is driven to rotate by the motor and reducer, generating a strong centrifugal force through high-speed rotation, causing particles or liquids of different densities to separate. The separated centrifuged liquid is discharged from the first outlet pipe 112, and the separated dewatered coal slime is discharged from the second outlet pipe 114.

[0044] The plate heat exchanger 200 is connected to the first output pipe 112 for recovering residual heat from the centrifuged liquid. A fixed pressure plate 210 is provided on one side of the plate heat exchanger 200, and the fixed pressure plate 210 is provided with a first inlet 211, a second inlet 212, a first output port 213, and a second output port 214. The first inlet 211 is connected to the first output pipe 112 of the centrifugal dehydrator 100 for inputting the centrifuged liquid at a higher temperature; the first output port 213 is connected to a filter press or sedimentation tank for outputting the centrifuged liquid after heat exchange. Since the centrifugal dehydrator 100 is located above the plate heat exchanger 200, the centrifuged liquid flows into the plate heat exchanger 200. Simultaneously, the second inlet 212 is connected to a circulating water pump 300 for inputting circulating water at a lower temperature; the second output port 214 is connected to a reagent storage mechanism 400 for discharging the heated circulating water. The circulating water exchanges heat with the centrifuged liquid within the plate heat exchanger 200 to raise its temperature.

[0045] The circulating water pump 300 is used to drive the circulation of circulating water. The circulating water pump 300 mainly includes a base 310 and a pump body 320. The pump body 320 is mounted on the upper surface of the base 310 by two fixing rings 340. The pump body 320 is provided with an input end 321 and an output end 322. The input end 321 is connected to the reagent storage mechanism 400; the output end 322 is connected to the second input port 212 of the plate heat exchanger 200. The circulating water pump 300 is used to drive the circulating water to circulate between the plate heat exchanger 200 and the reagent storage mechanism 400, thereby heating the reagent storage mechanism 400.

[0046] The reagent storage mechanism 400 is used for storing flotation chemical reagents and adding flotation chemical reagents to the flotation equipment. In this embodiment, the reagent storage mechanism 400 is generally cylindrical in shape and hollow inside. The reagent storage mechanism 400 is provided with a first reagent inlet 401 and a reagent outlet 404. The first reagent inlet 401 is used to add flotation chemical reagents for storage, and the reagent outlet 404 is connected to the dosing pipe of the flotation equipment for adding the required chemical reagents in the flotation process. Furthermore, a water jacket layer 410 is provided on the side wall of the reagent storage mechanism 400. A water jacket inlet 411, connected to the second outlet 214 of the plate heat exchanger 200, and a water jacket outlet 412, connected to the input end 321 of the circulating water pump 300, are located outside the side wall. Both the water jacket inlet 411 and the water jacket outlet 412 are connected to the interior of the water jacket layer 410, thus forming a circulating connection pipeline between the plate heat exchanger 200 and the water jacket layer 410. The water jacket layer 410 is heated through this circulating connection pipeline, and then the flotation chemical reagents stored inside the reagent storage mechanism 400 are heated through the water jacket layer 410. This improves the solubility and dispersibility of the reagents, making their dispersion in water more uniform, thereby enhancing the interaction between the reagents and mineral particles and improving the flotation effect. It also reduces the viscosity of the reagents, increasing their diffusion rate in water, further enhancing the interaction between the reagents and mineral particles and improving flotation efficiency. Especially in low-temperature environments, this preheating method can significantly improve flotation efficiency.

[0047] One specific working method of this embodiment is as follows:

[0048] First, the reagent storage unit 400 adds flotation chemical reagents to the flotation equipment, which then floats the fine coal slurry water to produce flotation frothed clean coal. Next, the flotation frothed clean coal is added to the centrifugal dewatering machine 100, which dewaters the flotation frothed clean coal to obtain clean coal slurry product and discharges the centrifugal liquid. Then, the centrifugal liquid is passed into the plate heat exchanger 200 to heat the circulating water, and the circulating water is circulated between the plate heat exchanger 200 and the reagent storage unit 400 by the circulating water pump 300, so that the water jacket 410 of the reagent storage unit 400 is kept at a suitable temperature to heat the flotation chemical reagents and improve the flotation efficiency.

[0049] In this embodiment, the energy recovery system for coal flotation dewatering utilizes the waste heat from the centrifugal liquid produced by the centrifugal dewatering machine 100 to heat the circulating water via a plate heat exchanger 200. The circulating water then circulates between the plate heat exchanger 200 and the water jacket 410 of the reagent storage mechanism 400 through a circulating water pump 300 and a circulating pipeline, preheating the flotation chemical reagents. This enhances the solubility, dispersibility, and interaction of the flotation chemical reagents with mineral particles, improving flotation efficiency. Furthermore, it recovers and utilizes the waste heat from the centrifugal liquid, reducing energy waste and lowering the overall energy consumption of the system. This solves the problem in existing technologies where the centrifugal liquid is directly sent to other processes for treatment and recovery, resulting in unutilized waste heat and energy waste.

[0050] Specifically, the centrifugal dehydrator 100 in this embodiment is further provided with a filter 115. The filter 115 is installed on the connecting pipe between the first output pipe 112 of the centrifugal dehydrator 100 and the first inlet 211 of the plate heat exchanger 200. It is used to filter out residual solid particles in the centrifuged liquid and prevent solid particles from entering the plate heat exchanger 200 and causing damage to the plate heat exchanger 200. Furthermore, the filter 115 in this embodiment is a self-cleaning filter, equipped with a pressure differential triggered backwashing device. When the inlet and outlet pressure difference exceeds a threshold, it can automatically start backwashing to discharge the solid particles remaining inside.

[0051] Specifically, in this embodiment, the plate heat exchanger 200 has a wide-channel plate structure. A support frame 220 is provided at the other end of the plate heat exchanger 200 opposite to the fixed pressure plate 210. A first upper slide rail 230 and a second lower slide rail 240 are provided between the fixed pressure plate 210 and the support frame 220. A movable pressure plate 250 is slidably mounted on the first slide rail 230 and the second slide rail 240. The fixed pressure plate 210 and the movable pressure plate 250 are connected by multiple bolts, and the distance between them is adjustable. A hot and cold flow channel and several heat exchange plates 260 are provided between the fixed pressure plate 210 and the movable pressure plate 250. The heat exchange plates 260 are used for sufficient contact heat exchange between the centrifugal liquid and the circulating water. In this embodiment, the heat exchange plates 260 are preferably made of 316L stainless steel or titanium alloy.

[0052] Specifically, in this embodiment, a filter assembly 330 is also provided on the input end 321 of the circulating water pump 300. The filter assembly 330 is used to effectively filter impurities in the circulating water and facilitate timely cleaning, so as to avoid impurities causing wear to the internal parts of the circulating water pump 300 and forming blockages inside the circulating water pump 300.

[0053] Specifically, in this embodiment, a stainless steel coil heat exchanger is also built into the water jacket 410 of the reagent storage mechanism 400. Furthermore, the reagent storage mechanism 400 is equipped with a stirring assembly 420, which mainly includes a stirring motor 421 and a matching reducer located on the upper outer side of the reagent storage mechanism 400, and a stirring shaft 422 and stirring blades 423 located inside the reagent storage mechanism 400. The stirring assembly 420 is used to ensure uniform mixing of the flotation chemical reagents stored inside the reagent storage mechanism 400, and can improve the temperature uniformity of the stored flotation chemical reagents, solving the problem of poor flowability and difficulty in discharge of local flotation chemical reagents under low temperatures. In addition to the first reagent inlet 401, the upper outer side of the reagent storage mechanism 400 is also equipped with a second reagent inlet 402 and a water inlet 403, allowing for the simultaneous addition of multiple flotation chemical reagents such as collectors and foaming agents, and enabling the addition of water to adjust the concentration. A level gauge 430 is also installed on the side wall of the reagent storage mechanism 400. Preferably, a nano-aerogel insulation layer can be coated on the outer wall of the reagent storage mechanism 400 to reduce the heat loss rate and improve the heating efficiency; baffles can also be set inside the reagent storage mechanism 400 to enhance heat exchange.

[0054] Furthermore, the energy recovery system for coal flotation dewatering in this embodiment is also equipped with a temperature control mechanism (not shown in the figure). The temperature control mechanism mainly includes a PLC controller, a temperature sensor, and a flow meter. The PLC controller, temperature sensor, flow meter, and circulating water pump 300 are all electrically connected. The temperature sensor is located at the second output port 214 of the plate heat exchanger 200. By detecting the temperature of the circulating water at the second output port 214, the flow rate of the circulating water pump 300 is adjusted, thereby continuously preheating the flotation chemical reagents stored in the reagent storage mechanism 400 and maintaining a stable temperature of the flotation chemical reagents to meet the requirements.

[0055] In addition, the centrifugal liquid after heat exchange can be fed into a filter press along with coal slurry water for filtration. The resulting filtrate is then recycled to the water washing and sorting process via a bucket elevator for further reuse. The resulting filter cake is collected to ensure the recovery rate of clean coal and avoid waste of raw materials.

[0056] Example 2

[0057] In the above embodiments, although the waste heat of the centrifugal liquid in the centrifugal dehydrator 100 is recovered and used to treat the waste heat of the chemical reagents selected for flotation, which solves the problem of the waste heat of the centrifugal liquid being directly sent to other processes for processing and recovery and thus wasting energy, it cannot fully meet the requirements for the recovery and utilization of the waste heat of the centrifugal liquid in some cases, and there is still a problem of insufficient energy utilization. In order to further improve the performance in terms of energy utilization based on the first embodiment, the second embodiment is provided below.

[0058] Please see Figure 5 The second embodiment is basically the same as the first embodiment in terms of the structure and function of the flotation equipment, centrifugal dewatering machine 100, plate heat exchanger 200, circulating water pump 300, and reagent storage mechanism 400 used in conjunction with it. The main difference between the second embodiment and the first embodiment is that the second embodiment also connects the pipeline of the circulating water output from the plate heat exchanger 200 after heat exchange to the heating system 600 of the production workshop, thereby making full use of the waste heat of the centrifuged liquid and improving energy utilization efficiency.

[0059] Specifically, in this embodiment, a three-way valve 500 is installed on the connecting pipeline between the second output port 214 of the plate heat exchanger 200 and the water jacket inlet 411 of the reagent storage mechanism 400. A branch pipe of the three-way valve 500 is connected to the underfloor heating network of the heating system 600 in the production workshop to supplement heat. Furthermore, in this embodiment, the three-way valve 500 is an electrically controlled valve, electrically connected to the temperature control mechanism of the energy recovery system for clean coal flotation dewatering. The temperature sensor of the temperature control mechanism detects the temperature of the circulating water at the second output port 214 of the plate heat exchanger 200 and adjusts the flow distribution between the two sides. In use, when the water temperature at the second output port 214 is below 40°C, heat is preferentially distributed to the reagent storage mechanism 400; when the water temperature at the second output port 214 is above 45°C, excess heat is switched to the heating system 600 in the production workshop.

[0060] In this embodiment, the energy recovery system for coal flotation dewatering connects the heating system 600 of the production workshop to a three-way valve 500 between the plate heat exchanger 200 and the reagent storage mechanism 400. The temperature control mechanism of the energy recovery system for coal flotation dewatering adjusts the three-way valve 500, thereby solving the problem that the recovery and utilization of waste heat of centrifugal liquid cannot be fully met in some cases in the above embodiment, and there is still insufficient energy utilization.

[0061] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An energy recovery system for clean coal flotation dewatering, characterized in that, Include: A centrifugal dewatering machine (100) is used to process water-containing clean coal produced by a flotation device; the centrifugal dewatering machine (100) has at least a first output pipe (112) for discharging centrifugal liquid and a second output pipe (114) for discharging dewatered clean coal. A plate heat exchanger (200) is connected to the first output pipe (112); and the plate heat exchanger (200) has a first output port (213) for discharging the centrifugal liquid after heat exchange. and A reagent storage mechanism (400) is connected to the plate heat exchanger (200); and the reagent storage mechanism (400) has at least a reagent outlet (404). A circulation connection pipeline is provided between the plate heat exchanger (200) and the water jacket layer (410) of the reagent storage mechanism (400). A circulation water pump (300) is provided on the circulation connection pipeline. The circulation water pump (300) can drive the circulating water to circulate between the plate heat exchanger (200) and the water jacket layer (410), thereby heating the floating chemical reagent in the reagent storage mechanism (400).

2. The energy recovery system for clean coal flotation dewatering as described in claim 1, characterized in that, The centrifugal dehydrator (100) includes a centrifuge body (110) and a drive assembly (120); the centrifuge body (110) is provided with a centrifuge input pipe (111), a first output pipe (112), and a second output pipe (114); the drive assembly (120) has at least a motor and a rotating shaft and a rotating drum disposed in the centrifuge body (110).

3. The energy recovery system for clean coal flotation dewatering as described in claim 1, characterized in that, A filter (115) is provided on the connecting pipe between the first output pipe (112) of the centrifugal dehydrator (100) and the plate heat exchanger (200).

4. The energy recovery system for clean coal flotation dewatering as described in claim 1, characterized in that, The plate heat exchanger (200) has at least a fixed clamping plate (210), on which a first inlet (211), a second inlet (212), a second outlet (214) and a first outlet (213) are provided; the first inlet (211) is connected to the first outlet pipe (112); the second inlet (212) is connected to the output end (322) of the circulating water pump (300); and the second outlet (214) is connected to the water jacket layer (410) of the reagent storage mechanism (400).

5. The energy recovery system for clean coal flotation dewatering as described in claim 4, characterized in that, The plate heat exchanger (200) is provided with a support frame (220). A first slide rail (230) and a second slide rail (240) are provided between the support frame (220) and the fixed pressure plate (210). A movable pressure plate (250) is slidably provided on the first slide rail (230) and the second slide rail (240). A hot and cold flow channel and a number of heat exchange plates (260) are provided between the movable pressure plate (250) and the fixed pressure plate (210).

6. The energy recovery system for clean coal flotation dewatering as described in claim 5, characterized in that, The heat exchange plates (260) are made of 316L stainless steel or titanium alloy.

7. The energy recovery system for clean coal flotation dewatering as described in any one of claims 1-6, characterized in that, The reagent storage mechanism (400) is provided with a stirring assembly (420), which includes a stirring motor (421) disposed outside the reagent storage mechanism (400), and a stirring shaft (422) and stirring blades (423) disposed inside the reagent storage mechanism (400).

8. The energy recovery system for clean coal flotation dewatering as described in any one of claims 1-6, characterized in that, The reagent storage mechanism (400) is provided with a second reagent inlet (402) and a water inlet (403) on the upper outer side.

9. The energy recovery system for clean coal flotation dewatering as described in any one of claims 1-6, characterized in that, Also includes: The temperature control mechanism has at least a PLC controller and a temperature sensor; the PLC controller, the temperature sensor and the circulating water pump (300) are all electrically connected; the temperature sensor is located at the second output port (214) of the plate heat exchanger (200); the temperature control mechanism can adjust the flow rate of the circulating water pump (300) according to the temperature of the circulating water at the second output port (214).

10. The energy recovery system for clean coal flotation dewatering as described in claim 9, characterized in that, A three-way valve (500) is provided on the connecting pipeline between the second output port (214) and the reagent storage mechanism (400). The branch pipe of the three-way valve (500) is connected to the heating system (600). The three-way valve (500) is electrically connected to the temperature control mechanism. The temperature control mechanism can adjust the flow distribution on both sides of the three-way valve (500) according to the temperature of the circulating water at the second output port (214).

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