A sludge treatment system using a coal mill to dry sludge and coupled with coal-fired power generation

Abstract

The present application relates to the field of sludge treatment technology, and discloses a sludge treatment system that utilizes a coal mill to dry sludge and couples it with coal-fired power generation, which includes a coal mill, wherein a sludge barrel and a coal barrel are coaxially arranged in the coal mill, wherein the coal barrel is arranged in the sludge barrel, an air inlet pipe is connected between the sludge barrel and the rotating hot air nozzle ring, a rotating shaft is fixedly connected to the grinding disc, wherein the rotating shaft is coaxially arranged in the coal barrel, a primary crushing assembly and a secondary crushing assembly are arranged between the sludge barrel and the coal barrel, wherein the primary crushing assembly is located above the secondary crushing assembly, and the rotating shaft is used to drive the primary crushing assembly and the secondary crushing assembly to rotate. The present application has the effect of preventing wet sludge from adhering to the surface of the grinding disc and the grinding roller, maintaining the normal operation of the coal mill equipment, and at the same time improving the grinding and screening efficiency of wet sludge, ensuring the continuous supply of coal powder and sludge powder mixed fuel, and improving the power generation efficiency of the power station boiler.

Description

Technical Field

[0001] The present application relates to the field of sludge treatment technology, and in particular to a sludge treatment system that utilizes a coal mill to dry sludge and couples it with coal-fired power generation. Background Art

[0002] Municipal sludge refers to solid, semi-solid and liquid wastes produced after sewage treatment in municipal sewage treatment plants. Sludge contains a large amount of organic matter and trace elements such as nitrogen, phosphorus and potassium. These substances have certain utilization value, but there are also heavy metal elements and toxic and harmful organic pollutants. At present, common sludge treatment and disposal methods include sludge incineration, sanitary landfill, land and building materials utilization, etc. During sludge incineration treatment, due to the low calorific value of sludge, the combustion state is unstable during the incineration process, the energy consumption is relatively large, and the construction and operation costs of sludge incineration plants are high. The one-time investment in the introduced equipment is large, and the pollutant treatment is also relatively complicated. To solve this problem, the prior art generally adopts a solution of mixing sludge with coal for combustion, and uses existing coal-fired boiler equipment and pollutant treatment equipment for appropriate transformation, which has obvious advantages over the construction of new independent sludge incineration plants.

[0003] The Chinese invention patent with the authorization publication number CN101723570B discloses a sludge treatment method that utilizes a power plant coal mill to dry the sludge and use it for power generation. The method includes directly introducing wet sludge with a moisture content of 70 to 90% into the coal mill, and utilizing the waste heat of the power plant boiler flue gas to dry the sludge. In the coal mill, the sludge is mixed with coal, ground, and dried, and finally coal powder containing dry sludge is obtained, which is directly sprayed into the power plant boiler for combustion and used for power generation.

[0004] Among them, the coal mill structure is as follows Figure 1 As shown, it includes a shell 15, a grinding disc 11, a grinding roller 12, a rotating hot air nozzle ring 13, a rotating separator 14 and other structures. A feed cylinder 16 and two output cylinders 17 are arranged on the top of the rotating separator 14. Coal blocks and wet sludge are put into the feeding cylinder 16 and fall onto the grinding disc 11. The rotation of the grinding disc 11 drives the grinding roller 12 to rotate. The grinding roller 12 grinds the coal blocks and wet sludge and grinds them into a mixture containing sludge powder and coal powder. The flue gas of the power station boiler is sprayed into the coal mill 1 through the rotating hot air nozzle ring 13, and the crushed mixture is blown upward into the rotating separator 14. The cyclone separator 14 screens it, and the powder that meets the fineness enters the two output cylinders 17 with the hot air and is transported to the power station boiler. The remaining larger mixture hits the outer wall of the feeding cylinder 16 and falls back on the grinding disc 11 to continue grinding.

[0005] With regard to the above-mentioned related technologies, the inventors found that this scheme directly introduces wet sludge with a moisture content of 70-90% into the coal mill and dries it during the grinding process. However, the wet sludge has a high moisture content and high viscosity, and it takes a considerable amount of time to complete the drying. During this period, the wet sludge is easy to adhere to the surface of the grinding disc and the grinding roller, which will have a great impact on the grinding of the coal. At the same time, due to the pressure of the grinding disc, the wet sludge will form blocks during the process of drying and being compressed, and the ground coal powder is also mixed in the sludge. At this time, the hot air introduced into the rotating hot air nozzle ring is not easy to blow up the sludge blocks mixed with coal powder. Even if it is blown up, the sludge blocks are too large and cannot be screened into the output cylinder at the rotary separator. The oversized sludge blocks fall down and are ground again, which leads to a longer grinding time, a decrease in the efficiency of supplying fuel to the power station boiler, and ultimately a decrease in the power generation efficiency of the power station boiler. Summary of the invention

[0006] In order to prevent wet sludge from adhering to the surface of the grinding disc and grinding roller, maintain the normal operation of the coal mill equipment, improve the grinding and screening efficiency of wet sludge, ensure the continuous supply of coal powder and sludge powder mixed fuel, and improve the power generation efficiency of power station boilers, the present application provides a sludge treatment system that utilizes a coal mill to dry sludge and couples it with coal-fired power generation.

[0007] The present application provides a sludge treatment system that uses a coal mill to dry sludge and couples it with coal-fired power generation, which adopts the following technical solutions:

[0008] A sludge treatment system which utilizes a coal mill to dry sludge and couples it with coal-fired power generation comprises a coal mill, wherein a grinding disc and three sets of grinding rollers are arranged in the coal mill, a rotating hot air nozzle ring is arranged at the bottom of the coal mill, and the rotating hot air nozzle ring is used to pass the flue gas of the power station boiler into the coal mill, a sludge barrel and a coal barrel are coaxially arranged in the coal mill, the coal barrel is arranged in the sludge barrel, an air inlet pipe is connected between the sludge barrel and the rotating hot air nozzle ring, a rotating shaft is fixedly connected to the grinding disc, the rotating shaft is coaxially arranged in the coal barrel, a primary crushing assembly and a secondary crushing assembly are arranged between the sludge barrel and the coal barrel, the primary crushing assembly is located above the secondary crushing assembly, and the rotating shaft is used to drive the primary crushing assembly and the secondary crushing assembly to rotate.

[0009] By adopting the above technical scheme, the wet sludge enters the pulverizer from between the sludge barrel and the coal barrel, the coal enters the pulverizer from the coal barrel, and the hot air from the rotating hot air nozzle ring is transported to the sludge barrel through the air inlet pipe to dry the wet sludge in the sludge barrel, so that the sludge can be in a dry state when it falls on the grinding disc, avoiding the wet sludge from adhering to the surface of the grinding disc and the grinding roller, and maintaining the normal operation of the pulverizer equipment; the dried sludge is then primarily crushed by the primary crushing component to form smaller dry sludge blocks, and the secondary crushing component crushes the sludge blocks again to form smaller sludge particles. Since the sludge is already in the form of smaller particles when it falls on the grinding disc, the grinding roller can grind the sludge more easily at this time, thereby improving the grinding and screening efficiency of the wet sludge, ensuring the continuous supply of coal powder and sludge powder mixed fuel, and improving the power generation efficiency of the power station boiler.

[0010] Optionally, a weight measuring base plate is provided between the sludge barrel and the coal barrel, the weight measuring base plate is located above the primary crushing assembly, the air outlet of the air inlet pipe is located at the top of the sludge barrel, a stirring element is provided above the weight measuring base plate, the rotating shaft is used to drive the stirring element to rotate, a discharge port is provided at the weight measuring base plate, and the weight measuring base plate is used to open and close the discharge port.

[0011] By adopting the above technical solution, the sludge falls on the weighing bottom plate after entering the sludge barrel. While the hot air output from the air inlet pipe dries the sludge, the rotating shaft drives the stirring element to rotate circumferentially along the coal-fired barrel, thereby cutting and breaking the fallen wet sludge, increasing the contact area between the wet sludge and the hot air, and thus improving the drying efficiency; when the drying is completed, the discharge port is opened, and the sludge can fall from the discharge port for the next step of crushing treatment.

[0012] Optionally, the coal-fired barrel is separately arranged, and the coal-fired barrel includes a first barrel, a second barrel and a third barrel. The stirring member includes a first driving ring, and the first driving ring is coaxially rotatably connected between the first barrel and the second barrel. The rotating shaft and the first driving ring are connected through a first driving rod. A limit ring is arranged on the first driving ring. The stirring member also includes a stirring shaft, and the stirring shaft is coaxially arranged in the limit ring. A plurality of cutting blades are arranged on the stirring shaft.

[0013] By adopting the above technical solution, the grinding disc drives the rotating shaft to rotate, the rotating shaft drives the first driving ring to rotate, the first driving ring drives the stirring shaft to rotate along the circumference of the coal barrel through the limiting ring, and the stirring shaft drives the cutting blade to slide along the circumference of the coal barrel, so that the fallen wet sludge can be cut and broken, thereby increasing the contact area between the wet sludge and the hot air.

[0014] Optionally, a first driving gear is coaxially fixedly connected to the second barrel, a first driven gear is coaxially fixedly connected to the bottom of the stirring shaft, the first driving gear is meshed with the first driven gear, a slider is threadedly connected to the stirring shaft, a guide cylinder is provided on the stirring shaft, guide rods are fixedly connected to both ends of the slider, grooves are provided at both ends of the guide cylinder corresponding to the guide rods, and the cutting blade is fixedly connected to the guide rod.

[0015] By adopting the above technical solution, since the first driving gear is meshed with the first driven gear, when the stirring shaft drives the first driven gear to rotate along the first driving gear, the first driven gear rotates at the same time, driving the stirring shaft to rotate at the same time. The rotation of the stirring shaft drives the slider to slide up and down in the guide cylinder, thereby driving the cutting blade to slide up and down through the guide rod, which can improve the crushing effect of wet sludge.

[0016] Optionally, the weight measuring base plate includes a fixed plate and a rotating plate, the fixed plate is fixedly connected between the outer wall of the coal barrel and the inner wall of the sludge barrel, a support ring is arranged in the discharge port, the rotating plate is located above the support ring, the rotating plate can rotate circumferentially along the coal barrel, the rotating plate is used to open and close the discharge port, a push rod is arranged on the guide rod located below, a positioning rod is fixedly connected to the bottom of the push rod, a cleaning plate is fixedly connected to the rotating plate, a positioning groove is provided on the cleaning plate toward one end of the positioning rod, and the positioning rod can be inserted into the positioning groove.

[0017] By adopting the above technical scheme, when the weight of the sludge on the weighing bottom plate reaches the weight required for blending with coal, the time for the rotating shaft to drive the stirring shaft to rotate in one direction becomes longer, so that the distance the slider slides downward becomes longer. At this time, the slider drives the push rod to slide downward through the guide rod, and the push rod rotates circumferentially along the coal barrel with the stirring shaft. When the push rod rotates and descends until the positioning rod is inserted into the positioning groove, the driving motor of the grinding disc changes direction, the slider slides upward, and drives the push rod to slide upward through the guide rod. The push rod drives the cleaning plate to slide upward, and the cleaning plate drives the rotating plate to slide upward. At the same time, the stirring shaft drives the cleaning plate to rotate circumferentially along the coal barrel, so that the cleaning plate and the rotating plate both slide upward in a spiral manner. On the one hand, the discharge port is opened to allow the dried sludge to fall; on the other hand, the sludge that falls on the fixed plate is pushed to the discharge port to facilitate the falling of the sludge.

[0018] Optionally, a weight sensor is installed at the bottom of the fixed plate, and the weight sensor is electrically connected to the driving motor of the grinding disc. The driving motor of the grinding disc can rotate in the reverse direction, and the weight sensor is used to control the duration of switching the direction of the driving motor of the grinding disc.

[0019] By adopting the above technical scheme, the weight sensor monitors the weight of the sludge on the weighing bottom plate. When the weight of the sludge does not reach the weight required for blending with coal, the rotating shaft drives the push rod to always rotate above the cleaning plate, thereby ensuring that the discharge port is in a closed state; when the required weight is reached, the weight sensor controls the grinding disc drive motor to extend the time of switching the steering direction, so that the distance the slider slides downward becomes longer. At this time, the slider drives the push rod to slide downward through the guide rod, so that the push rod can be rotated down until the positioning rod is inserted into the positioning groove. At this time, the grinding disc drive motor rotates in the opposite direction, driving the rotating plate to rotate spirally upward, thereby opening the discharge port and allowing the dried sludge to fall.

[0020] Optionally, a material guide box is provided on the coal-fired material barrel, and the material guide box is configured to be in a truncated cone shape. The first driving gear and the first driven gear are both located in the material guide box. The material guide box includes a first material guide box, a second material guide box and a third material guide box. The first material guide box and the third material guide box are both fixedly connected to the coal-fired material barrel, the second material guide box is coaxially rotatably connected between the first material guide box and the third material guide box, and the bottom of the stirring shaft extends into the second material guide box and is fixedly connected to the second material guide box.

[0021] By adopting the above technical solution, the bottom of the stirring shaft extends into the second material guide box, which can drive the second material guide box to rotate together. The first driving gear and the first driven gear are both located in the material guide box, which can protect them and prevent wet sludge from affecting the operation of the first driving gear and the first driven gear, while also guiding the sludge.

[0022] Optionally, the first-stage crushing assembly includes a second driving ring, which is coaxially rotatably connected between the second barrel and the third barrel, and the rotating shaft is fixedly connected to the second driving ring through a second driving rod. A second driving gear is coaxially arranged on the second driving ring, and a guide barrel is arranged on the coal barrel. The second driving gear is located in the guide barrel, and a second driven gear is arranged in the guide barrel. The second driven gear is meshed with the second driving gear, and a first crushing shaft is coaxially arranged on the second driven gear. A plurality of groups of first crushing blades are arranged on the first crushing shaft at intervals along the axial direction thereof, and a plurality of groups of second crushing blades are arranged on the coal barrel at intervals along the axial direction thereof, and the first crushing blades and the second crushing blades are arranged at intervals.

[0023] By adopting the above technical scheme, when the wet sludge is dried, it falls from the discharge port to the primary crushing assembly, the rotating shaft drives the second drive ring to rotate, the second drive ring drives the second drive gear to rotate through the second drive rod, the second drive gear drives the second driven gear to rotate, the second driven gear drives the first crushing shaft to rotate, the first crushing shaft drives the first crushing blade to rotate, the coal barrel drives the second crushing blade to rotate, the first crushing blade and the second crushing blade jointly crush the falling sludge, thereby crushing the sludge into smaller sludge blocks.

[0024] Optionally, the secondary crushing assembly includes a sludge discharge hopper, which is coaxially fixedly connected to the bottom of the coal barrel, a filter is provided at the bottom of the sludge discharge hopper, a second crushing shaft is coaxially provided on the grinding roller, the second crushing shaft extends into the sludge discharge hopper, and a plurality of crushing rods are provided on the second crushing shaft.

[0025] By adopting the above technical solution, the sludge blocks fall on the filter screen, the rotation of the grinding roller drives the second crushing shaft to rotate, and the second crushing shaft drives the crushing rod to rotate. Under the stirring of the crushing rod, the sludge blocks falling on the filter screen are further broken into sludge particles, and at the same time can pass through the filter screen and fall onto the grinding disc, making it convenient for the grinding roller to grind it into powder, thereby improving the grinding efficiency.

[0026] Optionally, an auxiliary heating cylinder is coaxially arranged outside the sludge barrel, and an intake fan is arranged on the top of the coal mill. The air inlet of the intake fan is connected with the interior of the sludge barrel through a heat absorption pipe, and the air outlet of the intake fan is connected with the interior of the auxiliary heating cylinder through a heat exhaust pipe.

[0027] By adopting the above technical solution, the exhaust steam generated in the process of drying wet sludge is extracted from the sludge barrel into the auxiliary heating barrel by the suction fan. The exhaust steam in the auxiliary heating barrel heats the sludge in the entire sludge barrel, thereby accelerating the sludge drying process and effectively utilizing the waste heat of the drying sludge.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. The wet sludge enters the coal mill from between the sludge barrel and the coal barrel, and the coal enters the coal mill from the coal barrel. The hot air from the rotating hot air nozzle ring is transported to the sludge barrel through the air inlet pipe to dry the wet sludge in the sludge barrel, so that the sludge can be in a dry state when it falls on the grinding disc, avoiding the wet sludge from adhering to the surface of the grinding disc and the grinding roller, and maintaining the normal operation of the coal mill equipment; the dried sludge is then crushed by the primary crushing component to form smaller dry sludge blocks, and the secondary crushing component crushes the sludge blocks again to form smaller sludge particles. Since the sludge is already in the form of smaller particles when it falls on the grinding disc, the grinding roller can grind the sludge more easily at this time, which improves the grinding and screening efficiency of the wet sludge, ensures the continuous supply of coal powder and sludge powder mixed fuel, and improves the power generation efficiency of the power station boiler;

[0030] 2. Since the first driving gear is meshed with the first driven gear, when the stirring shaft drives the first driven gear to rotate along the first driving gear, the first driven gear rotates at the same time, driving the stirring shaft to rotate at the same time, and the rotation of the stirring shaft drives the slider to slide up and down in the guide cylinder, thereby driving the cutting blade to slide up and down through the guide rod, which can improve the crushing effect of wet sludge;

[0031] 3. When the wet sludge is dry, it falls from the discharge port to the primary crushing assembly. The rotating shaft drives the second drive ring to rotate. The second drive ring drives the second drive gear to rotate through the second drive rod. The second drive gear drives the second driven gear to rotate. The second driven gear drives the first crushing shaft to rotate. The first crushing shaft drives the first crushing blade to rotate. The coal barrel drives the second crushing blade to rotate. The first crushing blade and the second crushing blade jointly crush the falling sludge, thereby crushing the sludge into smaller sludge blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a partial cross-sectional view of the overall structure of the background technology of this application, mainly used to show the coal mill;

[0033] Figure 2 It is a schematic diagram of the overall structure of the embodiment of the present application;

[0034] Figure 3 It is a partial structural cross-sectional view of the embodiment of the present application, mainly used to show the sludge barrel, coal barrel and drying assembly;

[0035] Figure 4 It is a front view of part of the structure of the embodiment of the present application, mainly used to show the coal-burning barrel;

[0036] Figure 5 It is a partial structural cross-sectional view of an embodiment of the present application, mainly used to show the drying component;

[0037] Figure 6 yes Figure 5 The partial enlarged view of part A is mainly used to show the stirring parts;

[0038] Figure 7 It is a front cross-sectional view of part of the structure of the embodiment of the present application, mainly used to show the material guide box;

[0039] Figure 8 It is a partial structural schematic diagram of an embodiment of the present application, mainly used to show the weight measuring base plate;

[0040] Fig. 9 It is a front cross-sectional view of part of the structure of the embodiment of the present application, mainly used to show the primary crushing component;

[0041] Fig.10 It is a partial structural schematic diagram of the embodiment of the present application, mainly used to show the primary crushing component;

[0042] Fig.11 It is a partial structural cross-sectional view of an embodiment of the present application, mainly used to show the secondary crushing component.

[0043] Explanation of reference numerals: 1, coal mill; 11, grinding disc; 12, grinding roller; 13, rotary hot air nozzle ring; 14, rotary separator; 15, housing; 16, feed cylinder; 17, output cylinder; 21, sludge barrel; 22, sludge silo; 221, feed port; 222, sealing plate; 223, guide plate; 231, cylinder; 232, connecting rod; 233, support rod; 31, coal barrel; 311, first barrel; 312, second barrel; 313, third barrel; 32, coal hopper; 4, drying assembly; 41, feed port; 42, feed port; 43, feed port; 44, feed port; 45, feed port; 46, feed port; 47, feed port; 48, feed port; 49, feed port; 50, feed port; 51, feed port; 52, feed port; 53, feed port; 54, feed port; 55, feed port; 56, feed port; 57, feed port; 58, feed port; 59, feed port; 60, feed port; 61, feed port; 62, feed port; 63, feed port; 64, feed port; 65, feed port; 66, feed port; 67, feed port; 68, feed port; 69, feed port; 70, feed port; 71, feed port; 72, feed port; 73, feed port; 74, feed port; 75, feed port; 76, feed port; 77, feed port; 78, feed port; 79, feed port; 80, feed port; 81, feed port; 82, feed port; 83, feed port; 84, feed port; 85, feed port; 86, feed port; 87, feed port; Duct; 411, fender; 42, rotating shaft; 43, stirring member; 431, first driving ring; 432, first driving rod; 433, first clamping ring; 434, first clamping groove; 435, connecting plate; 436, limiting ring; 437, stirring shaft; 438, first driving gear; 439, first driven gear; 440, slider; 441, guide rod; 442, guide cylinder; 443, cutting blade; 45, material guide box; 451, first material guide box; 452, second material guide box; 453, third material guide box; 454, rotating shaft; Moving ring; 455, rotating groove; 46, weighing bottom plate; 461, fixing plate; 462, rotating plate; 463, discharging port; 464, supporting ring; 465, guiding inclined plane; 466, rotating inclined plane; 471, pushing rod; 472, positioning rod; 473, clearing plate; 474, positioning groove; 475, weight sensor; 5, primary crushing assembly; 51, second driving ring; 52, second driving rod; 53, second clamping ring; 54, second clamping groove; 55, second driving gear; 56, first crushing member; 561, first crushing shaft; 562, second driven gear; 563, fixed block; 564, first crushing blade; 57, second crushing blade; 58, guide cylinder; 6, secondary crushing assembly; 61, sludge discharge hopper; 62, second crushing member; 621, second crushing shaft; 622, crushing rod; 63, filter screen; 7, auxiliary heating cylinder; 8, exhaust steam recovery assembly; 81, suction fan; 811, heat absorption pipe; 812, heat exhaust pipe; 82, water pump; 821, water inlet pipe; 822, drain pipe; 83, exhaust fan; 831, suction pipe; 832, exhaust pipe. DETAILED DESCRIPTION

[0044] The following is combined with Figure 2-11 This application is described in further detail.

[0045] The embodiment of the present application discloses a sludge treatment system that utilizes a coal mill to dry sludge and couples it with coal-fired power generation.

[0046] Reference Figure 2 and Figure 3A sludge treatment system using a coal mill to dry sludge and coupled with coal-fired power generation includes a coal mill 1, a sludge barrel 21 is vertically arranged at the center of the coal mill 1, the bottom opening of the sludge barrel 21 is located above the grinding disc 11, and the sludge barrel 21 is used to transport wet sludge into the coal mill 1. A coal barrel 31 is coaxially arranged in the sludge barrel 21, the top opening of the coal barrel 31 is higher than the sludge barrel 21, the bottom opening of the coal barrel 31 is located above the grinding disc 11, and the coal barrel 31 is used to transport coal blocks into the coal mill 1. A drying component 4, a primary crushing component 5 and a secondary crushing component 6 are arranged in sequence from top to bottom between the sludge barrel 21 and the coal barrel 31. After the wet sludge enters the sludge barrel 21, the drying component 4 first dries it, and the dried sludge is then primarily crushed by the primary crushing component 5 to form smaller dry sludge blocks. The secondary crushing component 6 crushes the sludge blocks again to form smaller sludge particles. The sludge particles fall onto the grinding disc 11, and the grinding roller 12 grinds them into powder. The hot air introduced by the rotating hot air nozzle ring 13 is blown to the rotating separator 14, and finally transported to the power station boiler for combustion.

[0047] Since the sludge is already in the form of small particles when it falls on the grinding disc 11, the grinding roller 12 can grind the sludge more easily, which speeds up the grinding process of the sludge and improves the grinding efficiency, thereby facilitating the supply of fuel to the power station boiler and improving the power generation efficiency of the power station boiler. At the same time, since the sludge has been dried when it falls, it is not easy to adhere to the grinding disc 11 and the grinding roller 12, thereby reducing the impact on the grinding of coal blocks by the grinding roller 12 and maintaining the stable operation of the coal mill 1.

[0048] Reference Figure 3 , an auxiliary heating cylinder 7 is coaxially arranged outside the sludge barrel 21, and the auxiliary heating cylinder 7 is fixedly connected to the top of the coal mill 1, and the sludge barrel 21 is fixedly connected to the auxiliary heating cylinder 7. A waste steam recovery component 8 is arranged on the coal mill 1, which is used to recover the waste steam generated during the drying process of the wet sludge and inject it into the auxiliary heating cylinder 7, and the heat of the waste steam is used to assist the drying of the sludge in the entire sludge barrel 21, so as to speed up the drying process of the sludge and improve the drying efficiency. After the waste steam is used, it can be transported to the power station boiler through the waste steam recovery component 8 for combustion treatment. At the same time, the waste steam condensed into liquid can be discharged from the coal mill 1 for subsequent wastewater treatment.

[0049] Reference Figure 3 A coal hopper 32 is coaxially fixedly connected to the top of the coal barrel 31 . The top of the coal hopper 32 is inclined away from the axis of the coal barrel 31 to facilitate the input of coal blocks. The coal hopper 32 is fixedly connected to the top of the coal mill 1 .

[0050] Reference Figure 2 and Figure 3, a sludge silo 22 is fixedly connected to the top of the sludge barrel 21, which is convenient for feeding wet sludge. The sludge silo 22 is sleeved outside the coal barrel 31 and is located below the coal hopper 32. The top of the sludge silo 22 is closed to prevent coal blocks from entering the sludge silo 22 when they are put into the coal hopper 32. The sludge silo 22 is horizontally arranged in the length direction and a feed port 221 is opened at one end in the length direction. A sealing plate 222 is arranged at the feed port 221 to close the feed port 221. The sealing plate 222 is horizontally arranged in the length direction and is perpendicular to the length direction of the sludge silo 22. Two guide plates 223 are fixedly connected at both ends of the sealing plate 222. The bottoms of the two guide plates 223 are rotatably connected to the side walls at both ends of the feed port 221 respectively. The top of the sludge silo 22 is grooved corresponding to the shape of the guide plate 223 to facilitate the rotation of the guide plate 223. Cylinders 231 are fixedly connected to the two vertical side walls of the sludge silo 22 that are perpendicular to the feed port 221. The telescopic axis of the cylinder 231 is located near one end of the feed port 221 and is tilted downward. A connecting rod 232 is fixedly connected between the two telescopic axes of the cylinders 231. Two support rods 233 are rotatably connected to the connecting rod 232. The other ends of the support rods 233 are hinged to the side of the sealing plate 222 away from the feed port 221. When it is necessary to open the sealing plate 222, the cylinder 231 is started, and the telescopic rod of the cylinder 231 is extended, and the sealing plate 222 is driven to rotate through the connecting rod 232 and the support rod 233, thereby opening the feed port 221 to facilitate the input of sludge. Similarly, when the feeding is completed, the telescopic rod of the cylinder 231 contracts to drive the sealing plate 222 to rotate in the opposite direction, thereby closing the feed port 221.

[0051] Reference Figure 3 and Figure 4 The drying assembly 4 includes an air inlet pipe 41, a rotating shaft 42, a stirring member 43 and a weight measuring base plate 46. The rotating shaft 42 is coaxially arranged in the coal barrel 31 and the bottom end is fixedly connected to the center of the grinding disc 11. The stirring member 43 is arranged on the rotating shaft 42 and is located between the weight measuring base plate 46 and the coal hopper 32. The coal barrel 31 is divided into a first barrel 311, a second barrel 312 and a third barrel 313. The first barrel 311 is fixedly connected to the coal hopper 32, the second barrel 312 is fixedly connected to the weight measuring base plate 46, and the third barrel 313 is fixedly connected to the sludge barrel 21.

[0052] Reference Figure 2 and Figure 3One end of the air inlet pipe 41 is connected to the rotating hot air nozzle ring 13, and the other end is connected to the inside of the sludge barrel 21 and is located above the sludge barrel 21. The hot air from the rotating hot air nozzle ring 13 is transported to the sludge barrel 21 through the air inlet pipe 41 to dry the wet sludge in the sludge barrel 21. At the same time, the stirring member 43 stirs the wet sludge to cut the wet sludge into pieces, increase the contact area between the wet sludge and the hot air, and thus improve the drying efficiency. In order to prevent the wet sludge from entering the air inlet pipe 41 and causing blockage, a mud guard 411 is fixedly connected to the inner wall of the sludge barrel 21, and the air outlet of the air inlet pipe 41 is located below the mud guard 411. The mud guard 411 is tilted downward, and the sludge falls along the mud guard 411.

[0053] Reference Figure 4 and Figure 5 The stirring member 43 includes a first driving ring 431, which is coaxially arranged between the first barrel 311 and the second barrel 312. The rotating shaft 42 is fixedly connected to the inner wall of the first driving ring 431 through the first driving rod 432. The rotating shaft 42 drives the first driving ring 431 to rotate. The upper and lower ends of the first driving ring 431 are coaxially fixedly connected with a first clamping ring 433. The cross section of the first clamping ring 433 is set to T shape. The bottom surface of the first barrel 311 and the top surface of the second barrel 312 are both provided with a first clamping groove 434 corresponding to the first clamping ring 433. The first clamping ring 433 is rotatably connected in the corresponding first clamping groove 434. The outer wall of the first driving ring 431 is fixedly connected to a limit ring 436 through a connecting plate 435, and a stirring shaft 437 is rotatably connected inside the limit ring 436. The axial direction of the stirring shaft 437 is parallel to the axial direction of the rotating shaft 42. A first driving gear 438 is coaxially fixedly connected to the outer wall of the second barrel 312, and a first driven gear 439 is coaxially fixedly connected to the bottom of the stirring shaft 437. The first driving gear 438 is meshed with the first driven gear 439. When the first driving ring 431 drives the stirring shaft 437 to rotate circumferentially along the coal-fired barrel 31, since the first driving gear 438 is meshed with the first driven gear 439, the first driven gear 439 rotates around the axis of the stirring shaft 437 at the same time, thereby driving the stirring shaft 437 to rotate.

[0054] Reference Figure 3 and Figure 5, a slider 440 is threadedly connected to the stirring shaft 437, two guide rods 441 are fixedly connected at both ends of the slider 440, a guide cylinder 442 is coaxially fixedly connected to the stirring shaft 437, both ends of the guide cylinder 442 are closed, a spiral groove is provided in the part of the stirring shaft 437 located in the guide cylinder 442, the slider 440 is slidably connected in the guide cylinder 442, and grooves are provided at both ends of the guide cylinder 442 corresponding to the guide rods 441. Multiple groups of cutting blades 443 are fixedly connected to each guide rod 441, the length of the cutting blades 443 is arranged in parallel along the circumference of the coal-fired barrel 31, and the multiple groups of cutting blades 443 are arranged at equal intervals along the length direction of the guide rod 441. The two groups of cutting blades 443 located at the same end of the slider 440 are symmetrically arranged on the plane where the axis of the stirring shaft 437 is located. The driving motor of the grinding disc 11 can rotate in the reverse direction, driving the rotating shaft 42 to rotate in the reverse direction, and the rotating shaft 42 drives the stirring shaft 437 to rotate in the reverse direction through the first driving ring 431, so that the slider 440 slides up and down.

[0055] When the wet sludge falls from the sludge bin 22, the grinding disc 11 drives the rotating shaft 42 to rotate, and the rotating shaft 42 drives the first driving ring 431 to rotate through the first driving rod 432. The first driving ring 431 drives the stirring shaft 437 to rotate along the circumference of the coal barrel 31 through the limiting ring 436. At the same time, since the first driving gear 438 is engaged with the first driven gear 439, the first driven gear 439 drives the stirring shaft 437 to rotate. The self-rotation of the stirring shaft 437 drives the slider 440 to slide up and down in the guide cylinder 442, thereby driving the cutting blade 443 to slide up and down through the guide rod 441. At the same time, the stirring shaft 437 can also drive the cutting blade 443 to slide along the circumference of the coal barrel 31, so that the falling wet sludge can be cut and crushed.

[0056] Reference Figure 7In order to prevent wet sludge from affecting the operation of the first driving gear 438 and the first driven gear 439, a material guide box 45 is coaxially sleeved on the coal barrel 31. The material guide box 45 is set in a truncated cone shape, and the first driving gear 438 and the first driven gear 439 are both located in the material guide box 45. The guide box 45 is divided into a first guide box 451, a second guide box 452 and a third guide box 453. The first guide box 451 and the third guide box 453 are fixedly connected to the outer wall of the coal barrel 31. The second guide box 452 is rotatably connected between the first guide box 451 and the third guide box 453. The two ends of the second guide box 452 are coaxially fixedly connected with a rotating ring 454. The bottom of the first guide box 451 and the top of the third guide box 453 are correspondingly provided with a rotating groove 455. The bottom of the stirring shaft 437 extends into the second guide box 452 and is fixedly connected to the second guide box 452. When the stirring shaft 437 rotates circumferentially along the coal barrel 31, the second guide box 452 can be driven to rotate. By setting the guide box 45, on the one hand, it can protect the first driving gear 438 and the first driven gear 439, and on the other hand, it can guide the falling sludge.

[0057] Reference Figure 5 and Figure 8 The weight measuring bottom plate 46 is located below the guide box 45. The weight measuring bottom plate 46 includes a fixed plate 461 and a rotating plate 462. The fixed plate 461 and the rotating plate 462 are both arranged in an arc shape and are both arranged coaxially with the coal barrel 31. The fixed plate 461 is fixedly connected between the outer wall of the coal barrel 31 and the inner wall of the sludge barrel 21. A discharge port 463 is formed between the two ends of the fixed plate 461 and the inner wall of the sludge barrel 21. The rotating plate 462 is used to close the discharge port 463 and is located above the fixed plate 461. The rotating plate 462 can rotate along the circumference of the coal barrel 31. When the rotating plate 462 rotates in a direction close to the fixed plate 461, the discharge port 463 is opened, and the wet sludge stirred by the stirring assembly falls from the discharge port 463. A support ring 464 is fixedly connected between the two ends of the fixed plate 461, and the rotating plate 462 is located above the support ring 464.

[0058] Reference Figure 5 and Figure 8A push rod 471 is fixedly connected to a cutting blade 443 located below, a positioning rod 472 is fixedly connected to the bottom of the push rod 471, and a cleaning plate 473 is fixedly connected to the top surface of the rotating plate 462. A positioning groove 474 is provided at one end of the cleaning plate 473 facing the positioning rod 472, and the positioning rod 472 can be inserted into the positioning groove 474. When the rotating plate 462 does not need to be opened, the slider 440 drives the push rod 471 to slide up and down above the cleaning plate 473 through the guide rod 441, and the positioning rod 472 is located above the cleaning plate 473. A weight sensor 475 is installed at the bottom of the fixed plate 461, and the weight sensor 475 is electrically connected to the driving motor of the grinding disc 11, and is used to control the duration of the switching direction of the driving motor of the grinding disc 11.

[0059] Reference Figure 5 and Figure 8 When the weight of the sludge on the weighing bottom plate 46 reaches the weight required for blending with coal, the weight sensor 475 controls the driving motor of the grinding disc 11 to extend the time for switching the direction. The grinding disc 11 drives the rotating shaft 42 to rotate in one direction for a longer time, and the rotating shaft 42 drives the stirring shaft 437 to rotate in one direction for a longer time, so that the sliding distance of the slider 440 sliding downward becomes longer. At this time, the slider 440 drives the push rod 471 to slide downward through the guide rod 441, and the push rod 471 rotates circumferentially along the coal barrel 31 with the stirring shaft 437. When the push rod 471 rotates and descends until the positioning rod 472 is inserted into the positioning groove 474, the driving motor of the grinding disc 11 changes direction, and the slider 440 slides upward, and drives the push rod 471 to slide upward through the guide rod 441, and the push rod 471 drives the positioning rod 472 to slide upward, and the positioning rod 472 drives the cleaning plate 473 to slide upward, and the cleaning plate 473 drives the rotating plate 462 to slide upward. At the same time, the stirring shaft 437 drives the push rod 471 to rotate along the circumference of the coal barrel 31, and the push rod 471 drives the cleaning plate 473 to rotate along the circumference of the coal barrel 31, so that the cleaning plate 473 and the rotating plate 462 both spirally slide upward, on the one hand, the discharge port 463 is opened, and on the other hand, the sludge falling on the fixed plate 461 is pushed to the discharge port 463, so that the sludge falls. At the same time, since the slider 440 slides up and down, the rotating plate 462 is driven to slide up and down, so that the discharge port 463 is periodically opened and closed, so that the dropping speed of the discharge port 463 can be evenly controlled, avoiding a large amount of sludge from being blocked at the primary crushing component 5, maintaining the normal operation of the primary crushing component 5, and facilitating the full crushing of the sludge.

[0060] Reference Figure 8In order to facilitate the upward spiral movement of the rotating plate 462, the two ends of the fixed plate 461 are provided with guide slopes 465, and the two guide slopes 465 are arranged to be tilted downward at one end away from the other. Two rotating slopes 466 are also arranged at the two ends of the bottom surface of the rotating plate 462 corresponding to the two guide slopes 465, and the two rotating slopes 466 are arranged to be tilted upward at one end away from the other. When the rotating plate 462 rotates upward, the guide slopes 465 guide it.

[0061] Reference Figure 3 and Fig. 9 The primary crushing assembly 5 is located below the weighing bottom plate 46, and includes a second drive ring 51, which is coaxially arranged between the second barrel 312 and the third barrel 313. The rotating shaft 42 is fixedly connected to the inner wall of the second drive ring 51 through the second drive rod 52, and the rotation of the rotating shaft 42 drives the second drive ring 51 to rotate. The upper and lower ends of the second drive ring 51 are coaxially fixedly connected with a second clamping ring 53, and the cross section of the second clamping ring 53 is set in a T shape. The bottom surface of the second barrel 312 and the top surface of the third barrel 313 are both provided with a second clamping groove 54 corresponding to the second clamping ring 53, and the second clamping ring 53 is rotatably connected in the corresponding second clamping groove 54.

[0062] Reference Figure 3 and Fig.10 The second driving ring 51 has a second driving gear 55 coaxially fixedly connected to the side wall thereof. The coal barrel 31 has a guide barrel 58 fixedly connected thereto. The second driving gear 55 is located in the guide barrel 58. The bottom of the guide barrel 58 is tilted away from the coal barrel 31. The bottom of the guide barrel 58 is closed. The guide barrel 58 is used to protect the second driving gear 55 and guide the sludge after the primary crushing. The guide barrel 58 has four groups of first crushing members 56 arranged uniformly along the circumference of the coal barrel 31. The first crushing member 56 includes a first crushing shaft 561. The first crushing shaft 561 is axially parallel to the axial direction of the coal barrel 31. The bottom of the first crushing shaft 561 extends into the guide barrel 58 and is coaxially fixedly connected to a second driven gear 562. The second driven gear 562 meshes with the second driving gear 55. A fixing block 563 is provided at the top of the first crushing shaft 561, and the fixing block 563 is fixedly connected to the inner wall of the sludge barrel 21. The top of the first crushing shaft 561 is rotatably connected to the fixing block 563. A plurality of first crushing blades 564 are fixedly connected to the first crushing shaft 561 at equal intervals along its axial direction, and a plurality of second crushing blades 57 are fixedly connected to the coal barrel 31 at equal intervals along its axial direction, and the first crushing blades 564 and the second crushing blades 57 are arranged at intervals.

[0063] After the wet sludge is dried by the drying component 4, it falls from the discharge port 463 to the primary crushing component 5, and the rotating shaft 42 drives the second driving ring 51 to rotate through the second driving rod 52, and the second driving ring 51 drives the second driving gear 55 to rotate, and the second driving gear 55 drives four groups of second driven gears 562 to rotate, and the four groups of second driven gears 562 drive the first crushing shafts 561 thereon to rotate, and the four first crushing shafts 561 drive the first crushing blades 564 thereon to rotate, and the coal barrel 31 drives the second crushing blades 57 to rotate, and the four groups of first crushing blades 564 and one group of second crushing blades 57 jointly crush the falling sludge, thereby crushing the sludge into smaller sludge blocks.

[0064] Reference Fig.11 The secondary crushing assembly 6 includes a sludge discharge hopper 61 and three groups of second crushing members 62. The sludge discharge hopper 61 is set in a truncated cone shape and is coaxially fixedly connected to the bottom of the coal barrel 31. A filter screen 63 is fixedly connected to the bottom of the sludge discharge hopper 61. The filter screen 63 is fixedly connected to the outer wall of the bottom opening of the third barrel 313. The three groups of second crushing members 62 are respectively arranged on three grinding rollers 12. The second crushing member 62 includes a second crushing shaft 621, which is coaxially fixedly connected to the center of the corresponding grinding roller 12 and extends into the sludge discharge hopper 61. A plurality of crushing rods 622 are evenly fixedly connected to the second crushing shaft 621, and the crushing rods 622 are located above the filter screen 63. When the grinding roller 12 rotates, the second crushing shaft 621 thereon is driven to rotate, and the second crushing shaft 621 drives the crushing rod 622 to rotate. Under the stirring of the crushing rod 622, the sludge blocks falling on the filter screen 63 are further broken into sludge particles, and can pass through the filter screen 63 and fall onto the grinding disc 11.

[0065] Reference Figure 2, the auxiliary heat cylinder 7 is coaxially sleeved outside the sludge barrel 21, and is fixedly connected between the sludge silo 22 and the sludge discharge hopper 61. The exhaust steam recovery component 8 includes an air intake fan 81 and a water pump 82. The air intake fan 81 is installed on the top of the sludge silo 22, and the air inlet of the air intake fan 81 is connected to the top of the sludge silo 22 through a heat absorption pipe 811, and the air outlet of the air intake fan 81 is connected to the inside of the auxiliary heat cylinder 7 through a heat exhaust pipe 812. When the air intake fan 81 is started, the exhaust steam generated by the drying component 4 during the drying of wet sludge is extracted from the sludge barrel 21 to the auxiliary heat cylinder 7 by the air intake fan 81. The exhaust steam in the auxiliary heat cylinder 7 heats the sludge in the entire sludge barrel 21, thereby accelerating the drying process of the sludge and effectively utilizing the waste heat of the dried sludge. The water pump 82 is located on the ground. The water inlet of the water pump 82 is connected to the bottom of the auxiliary heat tube 7 through the water inlet pipe 821. The water outlet of the water pump 82 is connected to a drain pipe 822. When the exhaust steam in the auxiliary heat tube 7 is cooled and condensed into waste water, it is extracted by the water pump 82 and discharged to the waste water treatment site. An exhaust fan 83 is also installed on the base of the coal mill 1. The air inlet of the exhaust fan 83 is connected to the bottom of the auxiliary heat tube 7 through the suction pipe 831. The air outlet of the exhaust fan 83 is connected to an exhaust pipe 832. The exhaust pipe 832 is connected to the power station boiler, and the exhaust steam after the temperature drops can be discharged to the power station boiler for combustion to treat the exhaust gas.

[0066] The implementation principle of the sludge treatment system of the embodiment of the present application that uses a coal mill to dry sludge and is coupled with coal-fired power generation is as follows: start the cylinder 231, the telescopic rod of the cylinder 231 extends to drive the guide plate 223 to rotate, thereby opening the feed port 221, and feeding the wet sludge from the feed port 221. The sludge enters the sludge barrel 21 from the sludge silo 22 and falls on the weighing bottom plate 46. The hot air from the rotating hot air nozzle ring 13 is transported to the sludge barrel 21 through the air inlet pipe 41 to dry the wet sludge in the sludge barrel 21. At the same time, the grinding wheel 11 drives the rotating shaft 42 to rotate, and the rotating shaft 42 drives the stirring shaft 437 to rotate circumferentially along the coal-fired barrel 31. At the same time, since the first driving gear 438 is engaged with the first driven gear 439, the first driven gear 439 drives the stirring shaft 437 to rotate. The rotation of the stirring shaft 437 drives the slider 440 to slide up and down in the guide cylinder 442, thereby driving the cutting blade 443 to slide up and down through the guide rod 441. At the same time, the stirring shaft 437 can also drive the cutting blade 443 to slide circumferentially along the coal-fired barrel 31, so that the fallen wet sludge can be cut and broken, increasing the contact area between the wet sludge and the hot air, thereby improving the drying efficiency.

[0067] When the weight of the sludge on the weighing base plate 46 reaches the weight required for blending with coal, the weight sensor 475 controls the driving motor of the grinding disc 11 to extend the time for switching the direction. The rotating shaft 42 drives the stirring shaft 437 to rotate in one direction for a longer time, so that the sliding distance of the slider 440 sliding downward becomes longer. At this time, the slider 440 drives the push rod 471 to slide downward through the guide rod 441, and the push rod 471 rotates circumferentially along the coal barrel 31 with the stirring shaft 437. When the push rod 471 rotates and descends until the positioning rod 472 is inserted into the positioning groove 474, the driving motor of the grinding disc 11 changes direction, and the slider 440 slides upward, and drives the push rod 471 to slide upward through the guide rod 441. The push rod 471 drives the cleaning plate 473 to slide upward, and the cleaning plate 473 drives the rotating plate 462 to slide upward. At the same time, the stirring shaft 437 drives the cleaning plate 473 to rotate circumferentially along the coal-fired barrel 31, so that the cleaning plate 473 and the rotating plate 462 both slide upward in a spiral, on the one hand opening the discharge port 463 to allow the dried sludge to fall; on the other hand, the sludge that falls on the fixed plate 461 is pushed to the discharge port 463 to facilitate the falling of the sludge.

[0068] After the wet sludge is dried by the drying component 4, it falls from the discharge port 463 to the primary crushing component 5, the rotating shaft 42 drives the second driving gear 55 to rotate, the second driving gear 55 drives the four groups of second driven gears 562 to rotate, the four groups of second driven gears 562 drive the first crushing shafts 561 thereon to rotate, the four first crushing shafts 561 drive the first crushing blades 564 thereon to rotate, the coal barrel 31 drives the second crushing blades 57 to rotate, the four groups of first crushing blades 564 and one group of second crushing blades 57 jointly crush the falling sludge, thereby crushing the sludge into smaller sludge blocks.

[0069] The sludge blocks fall on the filter screen 63, and the grinding roller 12 rotates to drive the second crushing shaft 621 thereon to rotate, and the second crushing shaft 621 drives the crushing rod 622 to rotate. Under the stirring of the crushing rod 622, the sludge blocks falling on the filter screen 63 are further broken into sludge particles, and can pass through the filter screen 63 and fall on the grinding disc 11.

[0070] During the whole process, the exhaust steam generated by the drying component 4 in the process of drying the wet sludge is extracted from the sludge barrel 21 to the auxiliary heating barrel 7 by the suction fan 81. The exhaust steam in the auxiliary heating barrel 7 heats the sludge in the entire sludge barrel 21, thereby accelerating the drying process of the sludge.

[0071] The sludge particles fall onto the grinding disc 11, and the grinding roller 12 grinds them into powder. The coal lumps enter the grinding disc 11 from the coal barrel 31, and the grinding roller 12 grinds them into powder. Finally, the hot air introduced by the rotating hot air nozzle ring 13 blows the mixed powder of sludge and coal to the rotating separator 14, and finally transports them to the power station boiler for combustion.

[0072] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sludge treatment system utilizing a coal mill to dry sludge and coupled with coal-fired power generation, comprising a coal mill (1), wherein a grinding disc (11) and three sets of grinding rollers (12) are arranged in the coal mill (1), and a rotating hot air nozzle ring (13) is arranged at the bottom of the coal mill (1), wherein the rotating hot air nozzle ring (13) is used to pass the flue gas of a power station boiler into the coal mill (1), and wherein: A sludge barrel (21) and a coal barrel (31) are coaxially arranged in the coal mill (1); the coal barrel (31) is arranged in the sludge barrel (21); an air inlet pipe (41) is connected between the sludge barrel (21) and the rotating hot air nozzle ring (13); a rotating shaft (42) is fixedly connected to the grinding disc (11); the rotating shaft (42) is coaxially arranged in the coal barrel (31); a primary crushing assembly (5) and a secondary crushing assembly (6) are arranged between the sludge barrel (21) and the coal barrel (31); the primary crushing assembly (5) is located above the secondary crushing assembly (6); the rotating shaft (42) is used to drive the primary crushing assembly (5) to move the primary crushing assembly (6) to the secondary crushing assembly (6); The crushing assembly (5) and the secondary crushing assembly (6) rotate, a weight measuring bottom plate (46) is arranged between the sludge barrel (21) and the coal barrel (31), the weight measuring bottom plate (46) is located above the primary crushing assembly (5), the air outlet of the air inlet pipe (41) is located at the top of the sludge barrel (21), a stirring member (43) is arranged above the weight measuring bottom plate (46), the rotating shaft (42) is used to drive the stirring member (43) to rotate, a discharge port (463) is arranged at the weight measuring bottom plate (46), and the weight measuring bottom plate (46) is used to open and close the discharge port (463), the coal barrel (31) is arranged in a split body, and the coal barrel (31) comprises The stirring member (43) comprises a first drive ring (431), the first drive ring (431) is coaxially rotatably connected between the first barrel (311) and the second barrel (312), the rotating shaft (42) and the first drive ring (431) are connected via a first drive rod (432), a limit ring (436) is provided on the first drive ring (431), and the stirring member (43) further comprises a stirring shaft (437), the stirring shaft (437) is coaxially arranged in the limit ring (436), and a plurality of cutting blades ( 443), a first driving gear (438) is coaxially fixedly connected to the second barrel (312), a first driven gear (439) is coaxially fixedly connected to the bottom of the stirring shaft (437), the first driving gear (438) is meshed with the first driven gear (439), a slider (440) is threadedly connected to the stirring shaft (437), a guide cylinder (442) is provided on the stirring shaft (437), both ends of the slider (440) are fixedly connected to guide rods (441), both ends of the guide cylinder (442) are provided with grooves corresponding to the guide rods (441), and the cutting blade (443) is fixedly connected to the guide rods (441).

2. A sludge treatment system utilizing a coal mill to dry sludge and coupled with coal-fired power generation according to claim 1, characterized in that: The weighing bottom plate (46) comprises a fixed plate (461) and a rotating plate (462); the fixed plate (461) is fixedly connected between the outer wall of the coal barrel (31) and the inner wall of the sludge barrel (21); a support ring (464) is provided in the discharge port (463); the rotating plate (462) is located above the support ring (464); the rotating plate (462) can rotate along the circumference of the coal barrel (31); the rotating plate (462) 2) used for opening and closing the discharge port (463), a push rod (471) is provided on the guide rod (441) located below, a positioning rod (472) is fixedly connected to the bottom of the push rod (471), a cleaning plate (473) is fixedly connected to the rotating plate (462), a positioning groove (474) is provided on one end of the cleaning plate (473) facing the positioning rod (472), and the positioning rod (472) can be inserted into the positioning groove (474).

3. The sludge treatment system using a coal mill to dry sludge and coupled with coal-fired power generation according to claim 2, characterized in that: A weight sensor (475) is installed at the bottom of the fixing plate (461); the weight sensor (475) is electrically connected to a driving motor of the grinding disc (11); the driving motor of the grinding disc (11) can rotate in the reverse direction; and the weight sensor (475) is used to control the duration of switching the direction of the driving motor of the grinding disc (11).

4. The sludge treatment system using a coal mill to dry sludge and coupled with coal-fired power generation according to claim 1, characterized in that: The coal-fired material barrel (31) is provided with a material guide box (45), the material guide box (45) being arranged in a truncated cone shape, the first driving gear (438) and the first driven gear (439) being both located in the material guide box (45), the material guide box (45) comprising a first material guide box (451), a second material guide box (452) and a third material guide box (453), the first material guide box (451) and the third material guide box (453) being both fixedly connected to the coal-fired material barrel (31), the second material guide box (452) being coaxially rotatably connected between the first material guide box (451) and the third material guide box (453), the bottom of the stirring shaft (437) extending into the second material guide box (452) and being fixedly connected to the second material guide box (452).

5. The sludge treatment system using a coal mill to dry sludge and coupled with coal-fired power generation according to claim 1, characterized in that: The primary crushing assembly (5) comprises a second drive ring (51), the second drive ring (51) being coaxially rotatably connected between the second barrel (312) and the third barrel (313), the rotating shaft (42) being fixedly connected to the second drive ring (51) via a second drive rod (52), the second drive ring (51) being coaxially provided with a second drive gear (55), the coal barrel (31) being provided with a guide barrel (58), the second drive gear (55) being located in the guide barrel (58), the guide barrel A second driven gear (562) is arranged inside (58), the second driven gear (562) meshes with the second driving gear (55), a first crushing shaft (561) is coaxially arranged on the second driven gear (562), a plurality of groups of first crushing blades (564) are arranged at intervals along the axial direction of the first crushing shaft (561), a plurality of groups of second crushing blades (57) are arranged at intervals along the axial direction of the coal barrel (31), and the first crushing blades (564) and the second crushing blades (57) are arranged at intervals.

6. The sludge treatment system according to claim 1, which utilizes a coal mill to dry sludge and couples it with coal-fired power generation, is characterized in that: The secondary crushing assembly (6) comprises a sludge discharge hopper (61), the sludge discharge hopper (61) being coaxially fixedly connected to the bottom of the coal barrel (31), a filter screen (63) being arranged at the bottom of the sludge discharge hopper (61), a second crushing shaft (621) being coaxially arranged on the grinding roller (12), the second crushing shaft (621) extending into the sludge discharge hopper (61), and a plurality of crushing rods (622) being arranged on the second crushing shaft (621).

7. The sludge treatment system using a coal mill to dry sludge and coupled with coal-fired power generation according to claim 1, characterized in that: An auxiliary heating cylinder (7) is coaxially arranged outside the sludge barrel (21), and an air intake fan (81) is arranged on the top of the coal mill (1); the air inlet of the air intake fan (81) is connected to the interior of the sludge barrel (21) through a heat absorption pipe (811), and the air outlet of the air intake fan (81) is connected to the interior of the auxiliary heating cylinder (7) through a heat exhaust pipe (812).

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