A sludge solar drying device

Abstract

This invention relates to the field of sludge solar drying technology, specifically disclosing a sludge solar drying device, comprising: a water curtain forming mechanism, which includes a lifter and a water distribution cylinder. The water distribution cylinder is fixedly installed on the top of the treatment chamber. When the working temperature inside the treatment chamber exceeds the safety set upper limit, the lifter can transport cooling water to the water distribution cylinder, which then transports the cooling water to the top of the treatment chamber, causing the cooling water to flow from the top of the treatment chamber to its outer wall and form a water curtain. In this sludge solar drying device, when the monitoring equipment detects that the working temperature inside the treatment chamber exceeds the safety set upper limit and there is a risk of overheating, the lifter transports cooling water to the water distribution cylinder, which then transports the cooling water to the top of the treatment chamber, causing the cooling water to flow from the top of the treatment chamber to its outer wall and form a water curtain, thereby reducing the working temperature inside the treatment chamber and preventing any impact on the normal drying treatment of wet sludge.

Description

Technical Field

[0001] This invention relates to the field of solar sludge drying technology, specifically to a solar sludge drying device. Background Technology

[0002] Solar-powered sludge drying is a low-temperature dewatering process for sludge, primarily using solar energy as the heat source. It treats sludge from wastewater treatment plants that has undergone mechanical dewatering via filter press and centrifugation. The incoming sludge typically has a moisture content between 78% and 83%. The entire system consists of a sealed, light-transmitting greenhouse, an automatic turning and composting device, an intelligent ventilation system, and a sludge conveying and spreading mechanism. Some auxiliary heating devices and exhaust gas collection and treatment units are also included. During operation, wet sludge is conveyed into the greenhouse via a sealed conveyor. The spreading mechanism evenly distributes the sludge into a thin layer. Sunlight penetrates the greenhouse through the translucent roof panels, causing the sludge to absorb solar radiation and heat up, vaporizing the internal free water. The greenhouse's ventilation system continuously regulates the indoor temperature and humidity, automatically expelling saturated, humid air and introducing dry fresh air, maintaining a constant water vapor pressure difference to accelerate moisture dissipation. The track-mounted turner on the equipment travels back and forth according to a set cycle, turning and breaking up the surface sludge, breaking up the sludge crust, balancing the uniformity of the material pile drying, and avoiding the generation of odors from local anaerobic conditions.

[0003] Chinese patent document CN221500929U discloses a solar photovoltaic sludge drying composting device, comprising: an exhaust fan, solar panels, a pig manure water pipe, a blower, a PLC control system, an inverter, a power controller, a battery, walls, a compost turner, a sprinkler system, a solar greenhouse, glass walls, and aeration pipes. The solar greenhouse consists of walls, glass walls, and a roof. The lower part of the solar greenhouse is enclosed by the walls, with the glass walls mounted on them and the roof mounted on them. The solar panels are placed on the exterior of the roof. The exhaust fan is mounted on the upper wall of the solar greenhouse. The sprinkler system is located in the central area of ​​the solar greenhouse, and the inlet of the sprinkler system is connected to the pig manure water pipe. The lower part of the greenhouse is divided into air chambers by a support plate. Ventilation pipes are installed on the walls of these air chambers. Sludge is piled on the support plate below the spray system. Guide rails are placed on the walls, and a turner travels on the guide rails to turn the sludge pile. Several parallel branch pipes are arranged on the support plate. Aeration pipes extend from the outside of the air chamber into the air chamber. One end of the aeration pipe is connected to a blower, and the other end passes through the support plate and connects to the various branch pipes on the support plate. The solar panels are connected to the power controller, and the battery is bidirectionally connected to the power controller. The power controller, inverter, and PLC control system are connected in sequence. The inverter is connected to the blower, exhaust fan, turner, and spray system to provide them with power.

[0004] However, the aforementioned patent documents also have the following shortcomings: Using a top-mounted polycarbonate panel as a light-collecting and heat-collecting carrier, and utilizing a sealed shed to create a greenhouse effect to increase the internal environmental temperature, relying on solar energy to achieve low-temperature dehydration and drying of sludge. Under strong midday sunlight in summer, a large amount of infrared heat radiation continuously penetrates the polycarbonate panel and floods into the shed. The shed's insulation structure dissipates heat slowly, easily causing the internal temperature to exceed 65°C. Excessively high environmental temperatures will cause multiple negative problems: Firstly, malodorous substances such as ammonia, hydrogen sulfide, and volatile organic acids contained in the sludge will rapidly and massively volatilize upon heating, significantly increasing the odor concentration inside the shed. This unorganized dispersion will worsen the plant's operating environment and increase the processing load on the exhaust gas deodorization system. Secondly, high temperatures will significantly increase the saturated water vapor content in the air. The air inside the shed will reach water vapor saturation in a short time, the water vapor partial pressure difference between the sludge surface and the ambient air will disappear, and the capillary water and adsorbed water inside the sludge will have difficulty continuously migrating and vaporizing. This will significantly reduce the daily sludge reduction efficiency and lengthen the drying cycle. Summary of the Invention

[0005] This invention provides a sludge solar drying device, which aims to solve the problem in related technologies that the temperature inside the silo easily exceeds 65°C in summer, which can easily affect the normal drying process of sludge.

[0006] The sludge solar drying device of the present invention includes a light-transmitting treatment chamber for drying wet sludge, and a water curtain forming mechanism. The water curtain forming mechanism includes a lifter and a water distributor. The water distributor is fixedly installed on the top of the treatment chamber. When the working temperature inside the treatment chamber exceeds the safety set upper limit, the lifter can transport cooling water to the water distributor, and the water distributor transports the cooling water to the top of the treatment chamber, so that the cooling water flows from the top of the treatment chamber to its outer wall and forms a water curtain to reduce the working temperature inside the treatment chamber.

[0007] Beneficial effects: During the drying process of wet sludge, the wet sludge is transported to the treatment chamber. Natural light shines into the chamber through the light-transmitting structure, generating solar radiation heat. The wet sludge accumulated inside the chamber continuously absorbs radiant heat and gradually heats up. The free water and bound water trapped inside the sludge continuously vaporize after being heated, generating water vapor. The moisture content inside the sludge continuously decreases. The drying process of the wet sludge is completed by relying on the continuous heat absorption and vaporization effect of solar energy. When the monitoring equipment detects that the working temperature inside the treatment chamber exceeds the safe upper limit and there is a risk of overheating, the elevator is activated to deliver cooling water to the water distribution cylinder. The water distribution cylinder delivers the cooling water to the top of the treatment chamber, so that the cooling water flows from the top of the treatment chamber to its outer wall and forms a water curtain to reduce the working temperature inside the treatment chamber and avoid affecting the normal drying process of the wet sludge.

[0008] Preferably, the water curtain forming mechanism further includes a water tank surrounding the lower outer side of the treatment chamber. The water tank is connected to the lifter and is used to provide a holding space for cooling water and to collect cooling water flowing down from the outer wall of the treatment chamber, so as to form a cycle of cooling water.

[0009] Its effects are as follows: the water tank, as the water storage and bearing component of the entire cooling water circulation system, can completely hold the cooling water that returns after heat exchange on the outer wall of the treatment chamber. Together with the lift, various pipelines, and water distribution cylinder, it forms a closed circulation water circuit. The recovered water can be extracted and transported to the outside of the chamber to form a cooling water curtain for reuse, reducing the loss caused by the one-time discharge of cooling water, reducing the frequency of water replenishment, improving the overall water resource recycling rate, and reducing water resource waste.

[0010] Preferably, the pumping end of the elevator is fixedly connected to a pumping pipe, the end of the pumping pipe away from the elevator is fixedly connected to a water tank, the draining end of the elevator is fixedly connected to a water supply pipe, the end of the water supply pipe away from the elevator is fixedly connected to a connecting pipe, and one end of the connecting pipe is fixedly connected to a water distribution cylinder.

[0011] Its effect is as follows: After the lifter starts running, the internal mechanism continuously generates a stable negative pressure suction force, and the water flow driving force is formed by the negative pressure difference, which drives the water pumping pipe to continuously draw the circulating cooling water stored in the water tank; the drawn cooling water flows orderly along the pipeline under the negative pressure traction, and flows through the water supply pipe and connecting pipe in sequence, and is continuously transported to the water distribution cylinder for storage and diversion. The cooling water is stably supplied by the entire set of negative pressure water supply channels, thereby completing the continuous water supply operation required for the formation of the cooling water curtain on the outer wall of the treatment chamber.

[0012] Preferably, the lower outer side of the water distribution cylinder is provided with multiple water outlets for discharging the cooling water in the water distribution cylinder to the top of the treatment chamber.

[0013] Its effect is that the side wall of the water distribution cylinder is surrounded by multiple water outlets of the same size and evenly distributed. The cooling water flowing into the water distribution cylinder will be released outward synchronously through all the water outlets. The structure design of multiple outlets releasing water synchronously disperses the concentrated water flow, so that the cooling water is sprayed and spread evenly and smoothly to the entire top surface of the treatment chamber without dead corners, avoiding local water accumulation and uneven water output.

[0014] Preferably, it also includes a filtration mechanism, which is connected to the water pumping pipe. The cooling water drawn by the water pumping pipe can pass through the filtration mechanism and be filtered.

[0015] Its effects are as follows: the filtration mechanism installed with the equipment can continuously filter and purify the water during the cooling water circulation process, intercepting various solid impurities such as sludge, debris, and dust particles mixed in the water; if unfiltered cooling water is directly circulated and sprayed, impurities in the water will adhere to and accumulate on the outer surface of the treatment chamber with the water flow. After a long period of accumulation, it will weaken the light transmission efficiency of the chamber's light-transmitting structure. The filtration mechanism eliminates the problem of impurity adhesion from the source through pre-filtering, ensuring that the stable and good light transmission effect of the treatment chamber is not affected by the sediment.

[0016] Preferably, the filtration mechanism includes a water tank, a mounting plate, and a filter assembly. The pumping pipe includes a pipe body one and a pipe body two. The two ends of the pipe body one are fixedly connected to the pumping end of the lift and the water tank, respectively. The two ends of the pipe body two are fixedly connected to the water tank and the water tank, respectively, so that the cooling water pumped by the pumping pipe can pass through the water tank. The mounting plate is fixedly connected inside the water tank, and the filter assembly is inserted into the mounting plate for filtering the cooling water flowing through the water tank.

[0017] Its effect is as follows: after the lift is started, the cooling water in the water tank is drawn by the water pump pipe, and the cooling water passes through the water tank. During this process, the cooling water is filtered by the filter assembly supported by the mounting plate to prevent impurities in the cooling water from adhering to the surface of the treatment chamber when it flows through the treatment chamber and affecting its light transmission effect.

[0018] Preferably, the top of the water tank is fitted with a top cover to cover the top of the water tank.

[0019] Its effect is that the top cover can shield the top of the water tank, preventing external debris from falling into the water tank from above.

[0020] Preferably, the mounting plate is provided with mounting holes, and the filter assembly includes a connector and a filter cartridge. The connector is inserted into the mounting hole, and the filter cartridge is fixedly connected to the bottom end of the connector for filtering cooling water.

[0021] Its effect is that the cooling water entering the water tank is poured into the filter cartridge through the connector, and the filter cartridge intercepts and filters the impurities in the cooling water.

[0022] Preferably, the top of the connector is fixedly connected to a handle for the operator to hold.

[0023] Its effect is that the handle makes it easy for operators to install or remove the filter components.

[0024] Preferably, it also includes a water-blocking mechanism, which includes a water-blocking frame and a connecting plate. The water-blocking frame is sleeved on the upper outer side of the treatment chamber, and the bottom surface of the water-blocking frame is lower than the top surface of the treatment chamber, while the top surface of the water-blocking frame is higher than the top surface of the treatment chamber. The connecting plate is fixedly connected between the water-blocking frame and the treatment chamber, and a set gap is left between the inner side of the water-blocking frame and the treatment chamber.

[0025] Its effect is as follows: when the cooling water flowing out from the water outlet falls to the top of the treatment chamber and spreads to the surroundings, flowing towards the outer wall of the chamber, the ring-shaped water baffle will form a barrier structure at the corner where the top of the treatment chamber intersects with the outer wall. This precisely intercepts the water flow that is about to spill outwards and detach from the chamber wall, constraining the water flow trajectory. This ensures that all the cooling water flows down neatly and continuously at a uniform speed along the outer wall of the treatment chamber, preventing the cooling water from splashing out from the corners of the chamber, reducing unnecessary water loss, and avoiding the problem of unnecessary waste of water resources.

[0026] The beneficial effects of this invention are:

[0027] 1. When the monitoring equipment detects that the real-time operating temperature inside the processing chamber is higher than the preset safety threshold, and determines that an overheating condition has occurred inside the chamber, the control system automatically starts the lift to deliver circulating cooling water to the water distribution cylinder. The water distribution cylinder diverts the cooling water and evenly distributes it to the top of the processing chamber. The cooling water flows along the top of the processing chamber to the surrounding outer walls, adhering to the walls and continuously descending to form a full-coverage cooling water curtain. Relying on the heat exchange of the water curtain, the accumulated heat in the chamber is continuously removed, and the operating temperature inside the processing chamber is quickly reduced, avoiding the problem of high temperature environment interfering with the stable drying operation of wet sludge.

[0028] 2. The water tank, together with the lift, various pipelines, and water distribution cylinder, forms a closed-loop water circuit. The recovered water can be pumped out again and transported to the outside of the tank to form a cooling water curtain for reuse, reducing the loss caused by the one-time discharge of cooling water, reducing the frequency of water replenishment, improving the overall water resource recycling rate, and reducing water waste.

[0029] 3. The equipment is equipped with a filter mechanism that is installed along the cooling water circulation path. It can continuously filter and purify the circulating water, intercepting solid impurities such as sludge, debris, and dust particles carried by the water. If the cooling water is sprayed and circulated directly without being purified by the filter mechanism, impurities in the water will adhere to and deposit on the outer wall surface of the treatment chamber with the water flow. Over time, the accumulation of dirt will reduce the light transmittance of the light-transmitting components of the chamber. The filter mechanism completes the impurity removal operation at the front end of the cooling water transmission, preventing impurities from adhering and forming scale at the source, and continuously maintaining the stable light transmittance of the treatment chamber.

[0030] 4. After the cooling water discharged from the water outlet falls to the top of the treatment chamber, it spreads outwards and is guided to the outer wall of the chamber. The surrounding water baffle is set at the corner where the top of the treatment chamber meets the outer wall, forming a ring-shaped barrier to intercept the overflowing water that is easy to splash or break away from the chamber wall, limit the flow path of the cooling water, and make all the water flow evenly and continuously downwards close to the outer wall of the treatment chamber, preventing the cooling water from splashing out from the corners of the chamber, reducing the ineffective loss of water, and avoiding the waste of water resources. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the main structure of the present invention.

[0032] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0033] Figure 3 This is a top view of the structure of the present invention.

[0034] Figure 4 This is the invention Figure 3 A magnified structural diagram of point A in the middle.

[0035] Figure 5 This is a front view cross-sectional structural diagram of the filtration mechanism of the present invention.

[0036] Figure 6 This is a three-dimensional structural diagram of the filter assembly and mounting plate of the present invention.

[0037] Figure label: 1. Processing chamber; 11. Support frame; 12. Transparent glass plate; 13. Door frame; 2. Water curtain forming mechanism; 21. Water tank; 22. Water distribution cylinder; 221. Water distribution outlet; 23. Lifter; 24. Water pumping pipe; 241. Pipe body one; 242. Pipe body two; 25. Water delivery pipe; 26. Connecting pipe; 3. Filtration mechanism; 31. Water tank; 32. Top cover; 33. Mounting plate; 331. Mounting hole; 34. Filtration assembly; 341. Connecting pipe end; 342. Filter cartridge; 343. Handle; 4. Water blocking mechanism; 41. Water blocking frame; 42. Connecting plate. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] like Figures 1 to 6As shown, the sludge solar drying device of the present invention includes a processing chamber 1, a water curtain forming mechanism 2, a filtration mechanism 3, and a water-blocking mechanism 4. The processing chamber 1 forms a sealed, light-transmitting processing cavity. After wet sludge is transported into the processing cavity, sunlight passes through the processing chamber 1, and the wet sludge absorbs solar radiation and heats up, causing the water inside to vaporize into water vapor, thereby achieving the drying treatment of the sludge. The water curtain forming mechanism 2 is fixedly installed on the processing chamber 1. When the temperature inside the processing chamber 1 is too high, the water curtain forming mechanism 2 supplies cooling water to the outer surface of the processing chamber 1, causing the cooling water to form a water curtain on the outer surface of the processing chamber 1. The water curtain flowing on the outer surface of the processing chamber 1 can reduce the temperature inside the processing chamber 1, thus avoiding affecting the normal drying treatment of the wet sludge. The filtration mechanism 3 is fixedly connected to the water curtain forming mechanism 2 and can filter the circulating cooling water to prevent impurities in the cooling water from adhering to the surface of the processing chamber 1 and affecting the sludge drying effect. The water-blocking mechanism 4 is fixedly connected to the top of the treatment chamber 1 to block the water flowing from the top of the treatment chamber 1 to the side, so as to ensure that the water can be recycled and to prevent water from splashing around the treatment chamber 1 and wasting water resources.

[0040] In the solar drying process of wet sludge, the wet sludge is first transported into the treatment chamber 1. Sunlight passes through the treatment chamber 1, and the wet sludge absorbs solar radiation and heats up, causing the water inside to vaporize into water vapor, thereby achieving the drying process of the sludge. When the temperature inside the treatment chamber 1 is too high, the water curtain forming mechanism 2 is activated to supply cooling water to the outer surface of the treatment chamber 1, so that the cooling water forms a water curtain on the outer surface of the treatment chamber 1, thereby reducing the temperature inside the treatment chamber 1. At the same time, the water curtain formed on the outer surface of the treatment chamber 1 can clean the dust attached to its outer surface, preventing the dust from affecting the light transmittance of the treatment chamber 1, so that the solar energy can be fully utilized. When the cooling water flows from the top to the side of the treatment chamber 1, the water flow is blocked by the water blocking mechanism 4 to prevent the cooling water from splashing directly onto the ground around the treatment chamber 1. When the cooling water is circulated in the water curtain forming mechanism 2, the circulating cooling water is filtered by the filter component 34 to prevent impurities in the cooling water from adhering to the outer surface of the treatment chamber 1 and affecting its light transmittance.

[0041] like Figure 1 and Figure 2As shown, the processing chamber 1 includes a support frame 11, multiple transparent glass panels 12, a door frame 13, and a sealed door. The multiple transparent glass panels 12 are fixedly connected to the outside of the support frame 11 to form a light-transmitting processing chamber. The door frame 13 is fixedly connected to the front side of the support frame 11. The sealed door is installed inside the door frame 13. The sealed door has an open state and a closed state. When the sealed door is in the open state, the staff can enter the processing chamber 1 to carry out work. When the sealed door is in the closed state, the processing chamber 1 can be sealed (the sealed door is prior art and is not shown in the figure, so it will not be described in detail here).

[0042] When carrying out solar drying of wet sludge, first open the sealed door of the treatment chamber 1, and use the conveying mechanism to smoothly transport and fill the wet sludge to be treated into the treatment chamber 1. After the sludge is filled, the sealed door can be closed to maintain the airtight condition inside the chamber. External natural light can penetrate the multiple transparent glass plates 12 arranged on the upper part of the chamber and enter the cavity of the treatment chamber 1. The solar radiation heat is fully projected onto the surface of the accumulated wet sludge. The wet sludge inside the chamber continuously absorbs radiant heat energy and gradually increases its own temperature. The free water and attached water contained in the sludge pores are continuously vaporized after being heated to form water vapor. The water content inside the sludge continues to decrease. By relying on the continuous heating and vaporization of water by solar energy, the drying process of wet sludge is completed.

[0043] like Figure 1 and Figure 2As shown, the water curtain forming mechanism 2 includes a water tank 21, a water distribution cylinder 22, a lifter 23, a pumping pipe 24, a water supply pipe 25, and a connecting pipe 26. The water tank 21 is fixedly installed at the lower outer side of the treatment chamber 1, used to store cooling water and provide sufficient water for the formation of the water curtain. It also collects cooling water flowing down from the outer wall of the treatment chamber 1, thereby achieving water resource recycling. A filter screen is placed inside the water tank 21 to intercept large solid impurities in the cooling water. The water distribution cylinder 22 is fixedly connected to the center of the top surface of the treatment chamber 1. Multiple water distribution ports 221 arranged in a circular pattern are provided at the lower outer side of the water distribution cylinder 22, allowing for the dispersed discharge of water. The lifter 23 is a lift pump. One end of the suction pipe 24 is fixedly connected to the suction end of the lifter 23, and the other end of the suction pipe 24 is fixedly connected to the water tank 21. Activating the lifter 23 allows water to be drawn from the water tank 21 through the suction pipe 24 under negative pressure. The delivery pipe 25 is fixedly connected to the discharge end of the lifter 23, and the connecting pipe 26 is fixedly connected to the water distribution cylinder 22. The end of the connecting pipe 26 away from the water distribution cylinder 22 is fixedly connected to the delivery pipe 25. The water drawn by the lifter 23 is transported to the water distribution cylinder 22 through the delivery pipe 25 and the connecting pipe 26. The water entering the water distribution cylinder 22 flows from multiple water outlets 221 to the top of the treatment chamber 1, and then flows downwards along the outer wall of the treatment chamber 1, thus forming a water curtain. The water curtain flowing on the outer surface of the treatment chamber 1 reduces the temperature inside the treatment chamber 1, thus avoiding any impact on the normal drying process of the sludge. Water flowing down the outer wall of the treatment chamber 1 returns to the water tank 21 and is then pumped out by the elevator 23 for use, thus forming a water recycling system to avoid wasting water resources.

[0044] When the temperature inside the processing chamber 1 exceeds the preset safety threshold, indicating a high-temperature condition, the system automatically triggers the operation of the lift 23. During operation, the lift 23 continuously generates negative pressure suction, drawing cooling water stored inside the water tank 21. Under the traction of negative pressure, the water in the water tank 21 flows sequentially through the pumping pipe 24, the delivery pipe 25, and the connecting pipe 26, and is stably delivered to the interior of the water distribution cylinder 22. The cooling water flowing into the water distribution cylinder 22 is simultaneously and evenly distributed outwards through multiple evenly distributed water outlets 221 around the circumference of the water distribution cylinder 22, spraying and flowing to the top surface of the processing chamber 1. After the cooling water, having completed its spraying process, spreads completely from the top of the treatment chamber 1, it flows smoothly downwards along the outer walls of the treatment chamber 1. The water body adheres to the outer wall of the chamber and continuously flows downwards, forming a fully covered, sealed water curtain. Relying on the continuous heat absorption and exchange of the water curtain, the heat conducted by the shell of the treatment chamber 1 is quickly carried away, thereby effectively neutralizing and reducing the internal working temperature of the treatment chamber 1. The cooling water, after completing heat exchange and cooling, flows continuously downwards along the outer walls of the treatment chamber 1 and falls back naturally under the action of gravity, all of which is collected and returned to the bottom water tank 21 for storage, forming a closed-loop water circulation circuit. This allows for continuous supply to the lifter 23 for uninterrupted circulation, extraction, and repeated cooling.

[0045] like Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6As shown, the water pumping pipe 24 includes a first pipe body 241 and a second pipe body 242, and the filtration mechanism 3 includes a water tank 31, a top cover 32, a mounting plate 33, and a filter assembly 34. One end of the first pipe body 241 is fixedly connected to the water pumping end of the lifter 23, and the other end of the first pipe body 241 is fixedly connected to the lower right side of the water tank 31; one end of the second pipe body 242 is fixedly connected to the lower outer side of the water tank 21, and the other end of the second pipe body 242 is fixedly connected to the upper left side of the water tank 31; the water pumped by the water pumping pipe 24 can pass through the water tank 31. The mounting plate 33 is fixedly connected inside the water tank 31. The mounting plate 33 has multiple mounting holes 331, and multiple filter components 34 are installed, each inserted into one of the mounting holes 331 on the mounting plate 33. These filter components are used to filter impurities in the water, preventing them from entering the lifter 23 and causing damage. They also prevent impurities from adhering to the outer surface of the treatment chamber 1 when the water flows to it, thus reducing the light transmittance of the treatment chamber 1. One end of the pipe body 242, which is fixedly connected to the water tank 31, is located above the mounting plate 33, while the other end of the pipe body 241, which is fixedly connected to the water tank 31, is located below the mounting plate 33. When the water pipe 24 draws water from the water tank 21, the water in the water tank 21 enters the water tank 31 along the pipe body 242 and is filtered by the filter components 34 inside the water tank 31. The top cover 32 is fitted on the top of the water tank 31 to cover the top of the water tank 31 and prevent external debris from falling into the water tank 31 from the top.

[0046] Continue to refer to Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the filter assembly 34 includes a connector 341, a filter cartridge 342, and a handle 343. The connector 341 is inserted into the mounting hole 331. The cross-section of the connector 341 is T-shaped so that it can be placed on the mounting plate 33. The filter cartridge 342 is fixedly connected to the bottom of the connector 341 and is used to filter water. Water delivered to the water tank 31 by the pipe body 242 flows into the filter cartridge 342 from the top of the connector 341, and the filter cartridge 342 filters out impurities in the water. The handle 343 is fixedly connected to the top edge of the connector 341 to facilitate the removal of the connector 341 and the filter cartridge 342 from the water tank 31 for cleaning. When the equipment performs the reflux cooling water filtration and purification process, the second pipe 242 continuously draws water containing impurities from the water tank 21 after cooling and circulation, and continuously transports the water into the water tank 31 for temporary storage. The water to be filtered flowing into the water tank 31 is poured from top to bottom into the filter cartridge 342 through the upper opening of the connector 341. During the process of water penetrating the filter cartridge 342, the filter cartridge 342 relies on its own dense filter medium to intercept and retain various impurities such as solid residues and suspended dirt mixed in the water, thus completing the water purification. The clean water purified by the filter cartridge 342 is retained at the bottom of the water tank 31 cavity, and then the first pipe 241 draws the purified cooling water from the water tank 31. The extracted clean water is continuously transported to the water distribution cylinder 22 through the water supply pipe 25 and the connecting pipe 26, and supplied to the subsequent chamber cooling water circulation.

[0047] like Figures 1 to 4 As shown, the water-blocking mechanism 4 includes a water-blocking frame 41 and connecting plates 42. The water-blocking frame 41 is fitted onto the upper outer side of the treatment chamber 1, with the bottom surface of the water-blocking frame 41 being lower than the top surface of the treatment chamber 1, and the top surface of the water-blocking frame 41 being higher than the top surface of the treatment chamber 1. Four connecting plates 42 are provided, each fixedly connected to one of the four inner corners of the water-blocking frame 41. The end of each connecting plate 42 away from the water-blocking frame 41 is fixedly connected to the treatment chamber 1. A certain gap exists between the inner side of the water-blocking frame 41 and the treatment chamber 1. The water-blocking frame 41 can block water flowing from the top of the treatment chamber 1 to its outer wall, preventing water from splashing onto the ground around the treatment chamber 1 and thus avoiding waste of water resources.

[0048] When the cooling water flowing out of the water outlet 221 falls to the top of the treatment chamber 1 and spreads outwards and transitions towards the outer wall of the chamber, the ring-shaped water baffle 41 forms a barrier structure at the corner where the top of the treatment chamber 1 intersects with the outer wall. This precisely intercepts the water flow that is about to spill outwards and detach from the chamber wall, constrains the water flow trajectory, and ensures that all the cooling water flows down neatly and continuously at a uniform speed along the outer wall of the treatment chamber 1. This prevents the cooling water from splashing out from the corners of the chamber, reduces meaningless water loss, and avoids the problem of unnecessary waste of water resources.

[0049] Working principle: In the process of drying wet sludge using solar heating, the wet sludge to be treated is first transported and placed into the treatment chamber 1 by a conveying device. After placement, the sealing door of the treatment chamber 1 is closed and locked to form a sealed and isolated space inside the treatment chamber 1. Natural light shines into the treatment chamber 1 through the light-transmitting structure to form solar radiation heat energy. The wet sludge accumulated in the chamber continuously absorbs radiant heat and gradually heats up. The free water and bound water trapped inside the sludge continuously vaporize after being heated to generate water vapor. The water content inside the sludge continuously decreases. The drying process of wet sludge is completed by the continuous heat absorption and vaporization effect of solar energy.

[0050] When the monitoring equipment detects that the internal working temperature of the processing chamber 1 exceeds the safety limit and there is a risk of overheating, the control system automatically starts the lifter 23 to operate continuously. After the lifter 23 starts working, it continuously generates negative pressure suction, relying on the negative pressure difference to draw the circulating cooling water stored in the water tank 21. Under the action of negative pressure traction, the cooling water in the water tank 21 flows smoothly along the pipeline through the water pumping pipe 24, the water delivery pipe 25 and the connecting pipe 26, and is transported to the interior of the water distribution cylinder 22 in a completely closed manner. The cooling water that flows into the water distribution cylinder 22 is then distributed through multiple water distribution cylinders evenly arranged on the cylinder body. Simultaneously, the cooling water from outlet 221 flows outwards, evenly covering and flowing across the entire top surface of the treatment chamber 1. After the cooling water covers the top of the treatment chamber 1, it extends outwards and is guided to the outer wall of the chamber. The water flows down along the outer wall of the treatment chamber 1, continuously spreading to form a full-coverage cooling water curtain. The heat is transferred from the chamber through the water curtain to regulate the temperature inside the chamber. After completing the heat exchange and cooling, the cooling water continues to fall along the outer wall of the treatment chamber 1 under the action of gravity, and all of it is collected and returned to the water tank 21 for storage, forming a complete closed-loop water circuit that can be continuously supplied to the lifter 23 for repeated extraction and recycling.

[0051] During the process of pumping cooling water from the water tank 21 by the pumping pipe 24, the water in the water tank 21 carrying impurities such as sludge and dust is first transported to the water tank 31 for temporary storage and buffering through the second pipe 242. The water to be purified flowing into the water tank 31 is completely poured into the filter chamber of the filter cartridge 342 from top to bottom through the opening at the upper end of the connector 341. As the water passes through the filter medium of the filter cartridge 342, the filter cartridge 342 can intercept and retain various solid impurities mixed in the water, completing the purification and impurity removal process. The clean cooling water after being filtered by the filter cartridge 342 is retained in the bottom area of ​​the water tank 31, and then the purified water is pumped out by the first pipe 241. The clean water then flows through the water supply pipe 25 and the connecting pipe 26 to be continuously transported to the water distribution cylinder 22, supplying qualified cooling water for the water curtain cooling process on the outer wall of the treatment chamber 1.

[0052] After the cooling water flowing out of the water outlet 221 covers the top of the treatment chamber 1, the water spreads outwards and flows towards the outer wall of the chamber. The water-blocking frame 41 located at the intersection of the top of the treatment chamber 1 and the outer wall forms a ring-shaped barrier, which limits and blocks the water flow that is prone to splashing outwards and overflowing from the chamber wall at the junction, and restricts the direction of water flow. This ensures that all the cooling water flows smoothly and continuously downwards in close contact with the outer wall of the treatment chamber 1, preventing the cooling water from splashing out from the corners of the chamber and being unable to be recovered, reducing unnecessary water loss and avoiding water waste from the source.

[0053] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A sludge solar drying device, comprising a light-transmitting processing chamber (1) for drying wet sludge, characterized in that, It also includes a water curtain forming mechanism (2), which includes a lifter (23) and a water distribution cylinder (22). The water distribution cylinder (22) is fixedly installed on the top of the processing chamber (1). When the working temperature inside the processing chamber (1) exceeds the safety setting limit, the lifter (23) can deliver cooling water to the water distribution cylinder (22), and the water distribution cylinder (22) delivers the cooling water to the top of the processing chamber (1), so that the cooling water flows from the top of the processing chamber (1) to its outer wall and forms a water curtain to reduce the working temperature inside the processing chamber (1).

2. The sludge solar drying device according to claim 1, characterized in that, The water curtain forming mechanism (2) also includes a water tank (21) surrounding the lower outer side of the treatment chamber (1). The water tank (21) is connected to the lifter (23) to provide a holding space for cooling water and to collect cooling water flowing down from the outer wall of the treatment chamber (1) so as to form a cycle of cooling water.

3. The sludge solar drying device according to claim 2, characterized in that, The pumping end of the elevator (23) is fixedly connected to a pumping pipe (24), and the end of the pumping pipe (24) away from the elevator (23) is fixedly connected to a water tank (21). The draining end of the elevator (23) is fixedly connected to a water supply pipe (25), and the end of the water supply pipe (25) away from the elevator (23) is fixedly connected to a connecting pipe (26). One end of the connecting pipe (26) is fixedly connected to a water distribution cylinder (22).

4. The sludge solar drying device according to claim 1, characterized in that, The lower outer side of the water distribution cylinder (22) is provided with multiple water outlets (221) for discharging the cooling water in the water distribution cylinder (22) to the top of the treatment chamber (1).

5. The sludge solar drying device according to claim 3, characterized in that, It also includes a filter mechanism (3), which is connected to a water pumping pipe (24). Cooling water drawn by the water pumping pipe (24) can pass through the filter mechanism (3), and the cooling water entering the filter mechanism (3) can be filtered.

6. The sludge solar drying device according to claim 5, characterized in that, The filtration mechanism (3) includes a water tank (31), a mounting plate (33), and a filter assembly (34). The water pumping pipe (24) includes a pipe body one (241) and a pipe body two (242). The two ends of the pipe body one (241) are fixedly connected to the pumping end of the lifter (23) and the water tank (31), respectively. The two ends of the pipe body two (242) are fixedly connected to the water tank (21) and the water tank (31), respectively, so that the cooling water pumped by the water pumping pipe (24) can pass through the water tank (31). The mounting plate (33) is fixedly connected inside the water tank (31). The filter assembly (34) is inserted into the mounting plate (33) for filtering the cooling water flowing through the water tank (31).

7. The sludge solar drying device according to claim 6, characterized in that, The top of the water tank (31) is fitted with a top cover (32) to cover the top of the water tank (31).

8. The sludge solar drying device according to claim 7, characterized in that, The mounting plate (33) is provided with mounting holes (331). The filter assembly (34) includes a connector (341) and a filter cartridge (342). The connector (341) is inserted into the mounting hole (331), and the filter cartridge (342) is fixedly connected to the bottom end of the connector (341) for filtering cooling water.

9. The sludge solar drying device according to claim 8, characterized in that, The top of the connector (341) is fixedly connected to a handle (343) for workers to hold.

10. The sludge solar drying device according to claim 1, characterized in that, It also includes a water-blocking mechanism (4), which includes a water-blocking frame (41) and a connecting plate (42). The water-blocking frame (41) is fitted on the upper outer side of the treatment chamber (1), and the bottom surface of the water-blocking frame (41) is lower than the top surface of the treatment chamber (1), while the top surface of the water-blocking frame (41) is higher than the top surface of the treatment chamber (1). The connecting plate (42) is fixedly connected between the water-blocking frame (41) and the treatment chamber (1), and a set gap is left between the inner side of the water-blocking frame (41) and the treatment chamber (1).

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