Boiler continuous drainage recycling device and method thereof

Abstract

The present application relates to a boiler continuous drainage recycling device and method, comprising a boiler, a recovery tank, a water turbine and a backwater pump, a transmission shaft is arranged between the water turbine and the backwater pump, the sewage outlet of the boiler is connected to the water turbine, the sewage of the boiler drives the water turbine to rotate, the water turbine drives the backwater pump to rotate synchronously through the transmission shaft, the water turbine is connected to the recovery tank, a coil pipe connected to the backwater pump is arranged in the recovery tank, a driving shaft is arranged at the top of the recovery tank, a synchronous sliding shaft which rotates synchronously with the driving shaft and can slide up and down is arranged in the driving shaft, an installation shaft is connected to the bottom of the synchronous sliding shaft, an air bag ring which floats with the sewage level in the recovery tank is arranged in the middle of the installation shaft, a top plate is fixed to the top of the installation shaft, and an opening and closing taper block is fixed to the bottom of the installation shaft, so that the two functions of sewage discharge and descaling are simultaneously controlled by a single component, and the sewage discharge and descaling are automatically completed according to the water level without an electric control system and external energy.

Description

Technical Field

[0001] This invention relates to the field of boiler wastewater recycling, and more specifically to a boiler wastewater recycling device and method. Background Technology

[0002] A boiler is a device that heats water and converts it into steam or hot water. It is widely used in heating, power generation, and industrial production. During boiler operation, as water is repeatedly heated and evaporated, minerals such as calcium and magnesium, as well as suspended impurities, continuously concentrate. Once they reach a certain concentration, they precipitate and adhere to the boiler's heating surfaces and the inner walls of pipes, forming scale. Scale has a much lower thermal conductivity than metal, and its presence significantly reduces the boiler's heat transfer efficiency, increases fuel consumption, and in severe cases, can cause localized overheating of the heating surfaces, affecting the boiler's operational safety.

[0003] Therefore, the concentration of impurities in the boiler water must be strictly controlled during boiler operation. The conventional practice is to continuously discharge a portion of the boiler water with a high concentration of impurities from the boiler and simultaneously replenish it with treated clean water. This continuously discharged high-temperature wastewater is called continuous wastewater discharge.

[0004] When continuous wastewater is discharged, it is still close to the water temperature inside the boiler, carrying a large amount of waste heat. Direct discharge would result in considerable waste of thermal energy, and the wastewater has a high concentration of impurities, including a large amount of suspended impurities and scaling substances. Therefore, when recycling continuous wastewater, it is usually introduced into a recovery device to preheat the purified water using its waste heat, thereby reducing the energy consumption of the boiler in heating the purified water. At the same time, impurities in the continuous wastewater will adhere to the heat exchange wall surface during the waste heat recovery process, forming scale, which will gradually reduce the heat exchange efficiency over time. Therefore, it is necessary to remove impurities from the heat exchange wall surface in a timely manner. In addition, the boiler's continuous wastewater discharge fluctuates with operating conditions, and the recovery device must also automatically adjust the retention and discharge of wastewater according to the amount of wastewater entering the device to maintain a stable water level within the device.

[0005] In existing boiler wastewater recycling systems, the aforementioned problems are typically addressed by multiple independent components. For water level control, level sensors are often used to detect the wastewater level within the recycling system. A controller then controls the opening and closing of an electric drain valve based on the detection signal, enabling wastewater retention and discharge. For descaling, independent descaling mechanisms are often installed, such as motor-driven brushes or scrapers, which are activated periodically or manually to remove impurities adhering to the heat exchanger walls. Water level control and descaling rely on multiple independent systems, including level sensors, controllers, electric drain valves, motors, and brushes. Each of the sensing and actuating components requires an electrical control system and relies on external power. Once the power is cut off, it cannot work. The reliability of the device is constrained by the power supply conditions. Sewage discharge and descaling are controlled independently and do not work together. The timing of descaling cannot be adaptively adjusted according to the sewage level and the amount of impurities. When the sewage level is low and there are few impurities, the descaling mechanism may still run idle and wear out. When the sewage level is high and there are a lot of impurities, descaling cannot be done in time, resulting in a decrease in heat exchange efficiency. The number of sensing, control and actuating components is large, the device structure is complex, the manufacturing cost is high, there are many failure points, and maintenance is inconvenient.

[0006] In summary, existing boiler wastewater recovery and utilization devices have drawbacks in the waste heat recovery process, such as insufficient reliability due to complex structure and high cost in the implementation of water level control and heat exchange surface descaling. Summary of the Invention

[0007] The purpose of this invention is to provide a boiler wastewater recycling device and method to solve the above-mentioned problems. It realizes the simultaneous control of two functions, sewage discharge and descaling, with a single component. It can automatically complete sewage discharge and descaling according to water level changes without the need for an electrical control system and external energy. It has a simple structure, reliable operation, and reduced manufacturing cost. See the following description for details.

[0008] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a boiler wastewater recycling device, comprising a boiler, a recycling tank, a water turbine, and a return water pump. A drive shaft is provided between the water turbine and the return water pump. The wastewater outlet of the boiler is connected to the water turbine. The boiler wastewater drives the water turbine to rotate. The water turbine drives the return water pump to rotate synchronously via the drive shaft. The water turbine is connected to the recycling tank, and a coil connected to the return water pump is provided inside the recycling tank. The top of the recycling tank is equipped with a drive shaft, inside which is a synchronous sliding shaft that rotates synchronously with the drive shaft and can slide up and down. The bottom of the synchronous sliding shaft is connected to an installation shaft. An airbag ring that floats with the water level of the sewage in the recycling tank is sleeved in the middle section of the installation shaft. A top plate is fixed to the top of the installation shaft, and an opening and closing cone block is fixed to the bottom of the installation shaft. The bottom of the recycling tank is equipped with a drain port that connects with the opening and closing cone block. The opening and closing cone block floats up with the airbag ring and disengages from the drain port to discharge sewage. A clutch disc is rotatably mounted at the bottom of the drive shaft. A wiping plate is mounted on the clutch disc, and a docking groove is opened at the bottom of the clutch disc. When the airbag ring floats up, it pushes the top plate into the docking groove and engages, so that the clutch disc rotates synchronously with the drive shaft, driving the wiping plate to wipe away impurities on the outer wall of the disc.

[0009] Preferably, a follower disk is fixed in the middle of the drive shaft, and a curved plate is provided on the outer circumference of the follower disk. The curved plate is bent downwards, and a stirring rod is fixed at the bottom of the curved plate. The top of the curved plate is higher than the top of the wiping plate. The curved plate causes the stirring rod to cover the rotation range of the wiping plate when it rotates around the drive shaft. The stirring rod rotates and the wiping plate removes impurities from the rod body.

[0010] Preferably, a support rod is provided between the mounting shaft and the opening and closing cone block so that the bottom of the opening and closing cone block is located inside the drain outlet. The bottom of the mounting shaft is also fixed with a support plate located at the top of the support rod. The support plate is used to support the bottom of the airbag ring. The airbag ring is located on the mounting shaft body between the support plate and the top plate to position the airbag ring.

[0011] Preferably, a connecting rod is fixed to the outer circumference of the clutch disc. The connecting rod is used to connect the pad and the clutch disc. The length of the connecting rod is less than the length of the bent plate. The wiping plate is made of flexible material to adapt to the extrusion of the stirring rod. A synchronizing rod is fixed to the bottom of one side of the pad. A synchronizing sleeve is fixed to the end of the synchronizing rod. The synchronizing sleeve is fitted onto the middle section of the support rod.

[0012] Preferably, the top plate has multiple snap-fit ​​inclined surfaces. After the top plate is inserted into the docking groove, it rotates with the synchronous sliding shaft and snaps the snap-fit ​​inclined surfaces into the docking groove. The synchronous sliding shaft is a polygonal column to ensure that the synchronous sliding shaft and the drive shaft slide up and down and maintain synchronous rotation.

[0013] Preferably, the bottom of the recycling tank has an installation groove, in which an opening and closing plate is fixed. The drain outlet is located in the middle of the opening and closing plate and is a tapered opening with a diameter that gradually decreases from top to bottom. The opening and closing cone is adapted to the drain outlet, and the bottom of the opening and closing cone has an arc-shaped connector to guide the opening and closing cone and the drain outlet to connect. A drain pipe communicating with the drain outlet is fixed to the bottom of the opening and closing plate, and multiple supports are fixed to the bottom of the recycling tank. The supports are used to raise the distance between the recycling tank and the installation surface to avoid the drain pipe body. A motor is fixed to the top of the recycling tank, and the output shaft of the motor is fixed to the top of the drive shaft.

[0014] Preferably, the turbine is equipped with multiple turbine blades that rotate inside it, and the shaft ends connecting the multiple turbine blades rotate synchronously with the drive shaft, and the other end of the drive shaft is fixedly connected to the rotating shaft of the return water pump.

[0015] Preferably, the water turbine is fixed to the mounting surface by a water turbine frame, and a sewage pipe is fixed to the water outlet of the water turbine. A pipe frame is fixed in the middle of the sewage pipe, and a connecting pipe is provided at the end of the sewage pipe, which is connected to the inside of the recovery tank.

[0016] Preferably, the return water pump has a return water frame fixed at the bottom, the return water pump inlet is connected to a clean water pipe, the clean water pipe is connected to an external clean water source, and the return water pump outlet is connected to a water supply pipe connected to the coil inlet. The coil outlet is equipped with an outlet head, which is connected to the boiler feedwater tank, and the water is pressurized by the boiler before entering the boiler. The coil is a spiral rising pipe that fits against the inner wall of the recovery tank.

[0017] The method for the boiler wastewater recycling device includes the following steps: a. Boiler wastewater enters the turbine through the boiler's wastewater outlet, driving the turbine to rotate. The turbine then drives the return water pump to rotate synchronously via the drive shaft, and the wastewater enters the recovery tank through the turbine. b. The return water pump sends clean water into the coil, and the clean water in the coil exchanges heat with the sewage in the recovery tank through the coil wall. c. When the sewage level in the recovery tank rises, the airbag ring floats up with the sewage level, driving the synchronous sliding shaft, mounting shaft and opening and closing cone to move upward synchronously. The opening and closing cone disengages from the drain outlet, opening the drain outlet to discharge sewage. When the sewage level drops, the airbag ring sinks with the water level, and the opening and closing cone returns to its original position to close the drain outlet. The degree of opening of the drain outlet increases with the increase of the airbag ring's upward movement, so that the drainage flow rate is adapted to the inflow flow rate. d. When the sewage level continues to rise until the airbag ring pushes the top plate into the docking groove and engages, the clutch disc rotates synchronously with the drive shaft, causing the wiping plate to rotate and wipe away impurities from the outer wall of the coil.

[0018] The beneficial effects are as follows: 1. By fitting an airbag ring onto the mounting shaft and allowing it to float with the water level of the sewage in the recovery tank, the airbag ring floats up, which not only drives the opening and closing cone block to move upward and separate from the drain outlet, opening the drain outlet to discharge sewage, but also pushes the top plate to move upward and insert into the docking groove and engage through the fastening inclined surface, so that the clutch disc rotates synchronously with the drive shaft, driving the wiping plate to wipe away impurities on the outer wall of the coil. This invention achieves simultaneous control of the two functions of sewage discharge and descaling with a single component. It can automatically complete sewage discharge and descaling with changes in water level without the need for an electrical control system and external energy. The structure is simple, the operation is reliable, and the manufacturing cost of the device is reduced.

[0019] 2. The turbine and the return water pump are connected by a drive shaft. Boiler sewage drives the turbine to rotate and synchronously drives the return water pump to rotate. This achieves synchronous increase and decrease of sewage flow into the recovery tank and clean water flow into the coil. The heat exchange conditions can always be matched without the need for an additional flow control mechanism. This avoids the situation where sewage accumulates in large quantities and clean water is insufficient, or clean water is excessive and sewage waste heat is insufficient. It can still operate stably and adaptively when the boiler blowdown fluctuates.

[0020] 3. The recovery tank is equipped with a coil connected to a return water pump. The return water pump sends clean water into the coil, and the clean water in the coil exchanges heat with the sewage in the recovery tank through the coil wall, realizing the recovery and utilization of waste heat from the boiler's continuous discharge sewage. The preheated clean water flows back to the boiler feedwater tank and is pressurized by the boiler before entering the furnace, reducing the energy consumption required for the boiler to heat the clean water and realizing energy recovery.

[0021] 4. The opening and closing cone blocks rely on their own weight and the sewage pressure inside the recovery tank to seal the drain outlet. The air bladder ring moves the opening and closing cone blocks up and down with the water level, realizing the continuous change of the drain outlet opening with the sewage level. When the water level rises, the opening and closing cone blocks move upward, the drain outlet opening increases, and the drainage flow increases. The drainage flow and the inflow flow are automatically balanced. When the water level drops, the opening and closing cone blocks move downward and reset, and the drain outlet closes. This achieves adaptive sewage discharge, which is fast when the water volume is large and sewage remains in the recovery tank when the water volume is small, without the need for manual intervention or electronic control adjustment.

[0022] 5. By inserting the top plate into the docking groove and engaging with the clutch disc only when the airbag ring floats to a high position, the wiping plate is driven to rotate for descaling only when the sewage level is high, there are many impurities deposited in the tank, the top coil is submerged in sewage, and the heat exchange demand is real. When the water level is low, the top plate separates from the docking groove, the clutch disc does not rotate, and the wiping plate remains stationary, avoiding ineffective rotation and wear of the wiping plate under low water level conditions, and extending the service life of the wiping plate.

[0023] 6. By synchronously changing the speed of the return water pump with the speed of the turbine, the speed of the return water pump decreases accordingly when the boiler blowdown volume and waste heat from the sewage decrease. This slows down the discharge speed of the clean water in the coil and prolongs the residence time of the clean water in the coil, allowing the limited waste heat from the sewage to be more fully transferred to the clean water. The clean water receives more preheating, thus optimizing the heat exchange effect under low load conditions. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the water turbine and return water pump of the present invention; Figure 3 This is a structural breakdown diagram of the water turbine of the present invention; Figure 4 This is a schematic diagram of the structure of the return water pump and drive shaft of the present invention; Figure 5 This is a structural breakdown diagram of the recycling tank and coil of the present invention; Figure 6 This is a schematic diagram of the structure of the coil of the present invention; Figure 7 This is a schematic diagram of the drive shaft and clutch disc of the present invention; Figure 8 This is a structurally disassembled schematic diagram of the drive shaft and airbag ring of the present invention; Figure 9 This is a schematic diagram of the drive shaft structure of the present invention; Figure 10 This is a schematic diagram of the clutch disc of the present invention; Figure 11 This is a structural breakdown diagram of the recycling tank of the present invention; Figure 12 This is a schematic diagram of the bottom three-dimensional structure of the present invention; Figure 13 This is a three-dimensional structural diagram of the bottom of the recycling tank of the present invention; Figure 14 This is a schematic diagram of the wiping plate of the present invention; Figure 15 This is a schematic diagram of the bottom structure of the clutch disc of the present invention.

[0026] The annotations in the attached figures are explained as follows: 1. Boiler; 2. Recycling tank; 201. Motor; 202. Opening / closing disc; 202a. Drain outlet; 203. Drain pipe; 204. Bracket; 205. Drive shaft; 206. Follower disc; 207. Bend plate; 208. Stirring rod; 209. Synchronous sliding shaft; 210. Mounting shaft; 210a. Support plate; 210b. Top plate; 210c. Snapping inclined surface; 211. Support rod; 212. Opening / closing cone block; 212a. Connecting joint; 213. Clutch disc 213a. Connecting groove; 214. Connecting rod; 215. Pad; 215a. Wiping plate; 216. Synchronizing sleeve; 217. Synchronizing rod; 218. Mounting groove; 3. Water turbine; 301. Water turbine blade; 302. Water turbine frame; 303. Pipe rack; 304. Sewage pipe; 305. Connecting pipe; 4. Return water pump; 401. Clean water pipe; 402. Water supply pipe; 403. Return water rack; 5. Coil; 501. Water outlet; 6. Airbag ring; 7. Drive shaft. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0028] See Figures 1-15 As shown, this invention provides a boiler wastewater recycling device, including a boiler 1, a recycling tank 2, a water turbine 3, and a return water pump 4. The wastewater outlet of the boiler 1 is connected to the water inlet of the water turbine 3. Multiple water turbine blades 301 are rotatably mounted on the shaft of the water turbine 3 (see details). Figure 3 The turbine blades 301 are set facing the water inlet direction. The turbine 3 is fixed to the mounting surface by the turbine frame 302. The outlet of the turbine 3 is fixedly connected to the sewage pipe 304. The middle part of the sewage pipe 304 is fixed by the pipe frame 303. The end of the sewage pipe 304 is connected to the inside of the recovery tank 2 through the connecting pipe 305. When the boiler 1 discharges sewage, the sewage enters the turbine 3 from the sewage outlet of the boiler 1, impacting the turbine blades 301 and driving the turbine 3 to rotate. At the same time as the turbine 3 rotates, the torque is transmitted to the return water pump 4 through the drive shaft 7. The return water pump 4 rotates synchronously. The sewage enters the recovery tank 2 through the outlet of the turbine 3, the sewage pipe 304 and the connecting pipe 305 for temporary storage. The sewage level in the tank begins to rise. The bottom of the return water pump 4 is fixed to the mounting surface via the return water bracket 403. The inlet of the return water pump 4 is connected to the clean water pipe 401, which is connected to an external clean water source. The outlet of the return water pump 4 is connected to the inlet of the coil 5 via the water supply pipe 402. The coil 5 is a spring-shaped spiral rising pipe that fits against the inner wall of the recovery tank 2. The outlet of the coil 5 is equipped with an outlet head 501, which is connected to the feed water tank of the boiler 1. When the return water pump 4 rotates synchronously with the water turbine 3, it draws in external clean water through the clean water pipe 401 and sends it into the coil 5 through the water supply pipe 402. The clean water flows from bottom to top along the spiral coil. The clean water in the coil 5 exchanges heat with the sewage in the recovery tank 2 through the wall of the coil 5, absorbs the waste heat of the sewage, and then flows into the feed water tank of the boiler 1 through the outlet head 501. The boiler 1 then pressurizes the water and sends it into the boiler.

[0029] A motor 201 is fixed to the top of the recycling tank 2. The output shaft of the motor 201 is fixedly connected to the top of the drive shaft 205. The drive shaft 205 extends vertically into the recycling tank 2 along its axis. The drive shaft 205 is hollow inside and contains a polygonal prism-shaped synchronous slide shaft 209 coaxial with the drive shaft 205. The outer peripheral wall of the synchronous slide shaft 209 is fitted to the inner wall of the drive shaft 205, so that the synchronous slide shaft 209 rotates synchronously with the drive shaft 205 and can also move along the drive shaft 205. The axis of the 5 slides up and down. The output shaft of the motor 201 drives the drive shaft 205 to rotate. When the drive shaft 205 rotates, it drives the synchronous slide shaft 209 to rotate synchronously through the cooperation of the polygonal column. The synchronous slide shaft 209 transmits the rotation to the mounting shaft 210. The bottom of the synchronous slide shaft 209 is fixedly connected to the mounting shaft 210. The mounting shaft 210 extends downward along the axis of the recycling tank 2. The top of the mounting shaft 210 is fixed with a top plate 210b. The top of the top plate 210b has multiple snap-fit ​​inclined surfaces 210c (see details). Figure 8 A support rod 211 is fixed to the bottom of the mounting shaft 210. The support rod 211 extends downward along the axis of the mounting shaft 210 to connect the opening and closing cone 212 and allow the bottom of the opening and closing cone 212 to extend into the drain outlet 202a (see details). Figure 11 A support plate 210a is fixed at the lower part of the mounting shaft 210 and at the top of the support rod 211. The support plate 210a extends outward radially along the mounting shaft 210. The airbag ring 6 is fitted onto the shaft of the mounting shaft 210, located between the support plate 210a and the top plate 210b. The bottom of the airbag ring 6 is supported by the support plate 210a, and the top of the airbag ring 6 is limited by the top plate 210b, thus positioning the airbag ring 6 on the shaft of the mounting shaft 210. The airbag ring 6 is an annular float that floats on the surface of the sewage in the recovery tank 2. When the sewage level in the recovery tank 2 rises, the airbag ring 6 rises with the buoyancy, causing the mounting shaft 210 and the synchronous sliding shaft 209 to move upward along the drive shaft 205. The upward movement of the mounting shaft 210 causes the top plate 210b to move upward toward the docking groove 213a at the bottom of the clutch disc 213 (see details). Figure 14 , Figure 15 At the same time, the support rod 211 and the opening and closing cone block 212 move upward. When the sewage level in the recovery tank 2 drops, the air bag ring 6 sinks with the liquid level, which drives the installation shaft 210 and the synchronous sliding shaft 209 to move downward. The top plate 210b moves away from the docking groove 213a, and the opening and closing cone block 212 moves downward and resets.

[0030] The bottom of the recycling tank 2 has an installation groove 218, and an opening and closing plate 202 is fixed in the installation groove 218. The opening and closing plate 202 is disc-shaped and horizontally arranged. A drain outlet 202a is opened in the middle of the opening and closing plate 202. The drain outlet 202a is a tapered opening with a diameter that gradually decreases from top to bottom. A drain pipe 203 is fixed at the bottom of the opening and closing plate 202. The drain pipe 203 is connected to the drain outlet 202a and is used to lead the sewage discharged from the drain outlet 202a out of the recycling tank 2. Multiple supports 204 are fixed at the bottom of the recycling tank 2. The supports 204 are distributed around the circumference of the recycling tank 2. The supports 204 are used to raise the distance between the recycling tank 2 and the installation surface to avoid the drain pipe 203 body, so that the lower end of the drain pipe 203 is suspended above the installation surface to ensure smooth sewage discharge. The opening and closing cone 212 is positioned above the opening and closing plate 202 and is coaxially arranged with the drain outlet 202a. The support rod 211 at the bottom of the mounting shaft 210 extends downward along the axis of the recycling tank 2 to the bottom of the recycling tank 2. The bottom of the support rod 211 is fixedly connected to the opening and closing cone 212. The length of the support rod 211 allows the bottom of the opening and closing cone 212 to extend into the drain outlet 202a. The outer contour of the opening and closing cone 212 is adapted to the conical hole of the drain outlet 202a. The conical surface of the opening and closing cone 212 fits against the wall of the conical hole of the drain outlet 202a. The bottom of the opening and closing cone 212 is provided with an arc-shaped connector 212a, which protrudes downward from the bottom of the opening and closing cone 212 to guide the opening and closing cone 212 to connect with the drain outlet 202a.

[0031] Under normal conditions, when the sewage level in the recovery tank 2 does not reach the airbag ring 6, the opening and closing cone 212 presses against the drain outlet 202a under its own weight and the pressure of the sewage in the recovery tank 2. The conical surface of the opening and closing cone 212 is in contact with the conical hole wall of the drain outlet 202a, keeping the drain outlet 202a closed and the sewage in the recovery tank 2 stagnant. When the sewage level in the recovery tank 2 rises and touches the airbag ring 6, the airbag ring 6 floats upward under the action of buoyancy, driving the mounting shaft 210 and the support rod 211 to move upward. The support rod 211 drives the opening and closing cone 212 to move upward, and the opening and closing cone 212 disengages from the drain outlet 202a, opening the drain outlet 202a. The sewage is discharged from the recovery tank 2 through the drain outlet 202a and the drain pipe 203. The upward movement of the opening and closing cone 212... The amount of water increases with the increase of the floating amount of the airbag ring 6, that is, the floating amount increases with the increase of the amount of sewage in the recovery tank 2. The opening gap of the drain outlet 202a increases accordingly, and the drainage flow rate increases accordingly. When the drainage flow rate and the inlet flow rate tend to be equal, the sewage level in the recovery tank 2 remains roughly balanced and continues to preheat the clean water in the coil 5. When the drainage flow rate is greater than the inlet flow rate, the liquid level slowly drops. When the sewage level drops, the airbag ring 6 sinks with the liquid surface, driving the mounting shaft 210, support rod 211 and opening and closing cone block 212 to move down. The arc-shaped butt joint 212a first contacts the drain outlet 202a, guiding the cone surface of the opening and closing cone block 212 to re-fit with the cone hole wall of the drain outlet 202a, resetting and sealing the drain outlet 202a.

[0032] A clutch disc 213 is rotatably mounted at the bottom of the drive shaft 205. The clutch disc 213 is loosely fitted onto the lower end of the drive shaft 205 and does not normally rotate with the drive shaft 205. It only rotates synchronously with the drive shaft 205 after engaging with the top plate 210b at the top of the mounting shaft 210. A mating groove 213a is provided at the bottom of the clutch disc 213, with the groove opening facing downwards and opposite to the engaging inclined surface 210c of the top plate 210b. This groove accommodates and engages the upwardly inserted top plate 210b. A connecting rod 214 is fixed to the outer circumference of the clutch disc 213. The connecting rod 214 extends radially outwards along the clutch disc 213. A fixed connection pad 215 is provided at the end. The pad 215 is vertically arranged on the outside of the clutch disc 213. The side of the pad 215 closest to the inner wall of the recycling tank 2 is a wiping plate 215a. The wiping plate 215a is long and extends along the height of the inner wall of the recycling tank 2. The wiping plate 215a is made of flexible material and can be elastically deformed under external force. The wiping plate 215a is attached to the outer wall of the coil 5. The coil 5 is a spiral channel set in contact with the inner wall of the recycling tank 2. The extension length of the wiping plate 215a covers the axial span of the spiral channel, so that the wiping plate 215a can wipe the outer wall of each section of the spiral coil 5 in turn as the clutch disc 213 rotates one revolution.

[0033] A synchronizing rod 217 is fixed to one bottom side of the pad 215. The synchronizing rod 217 extends downward along the axis of the recovery tank 2. A synchronizing sleeve 216 is fixed to the end of the synchronizing rod 217. The synchronizing sleeve 216 is fitted onto the middle section of the support rod 211. The support rod 211 passes through the synchronizing sleeve 216. The synchronizing sleeve 216 and the support rod 211 are in clearance fit, allowing the synchronizing sleeve 216 to rotate relative to the support rod 211 and slide relative to the support rod 211. Under normal conditions, the sewage level in the recovery tank 2 is low, the airbag ring 6 is in a low position, the top plate 210b is located below the docking groove 213a and separated from the docking groove 213a, the clutch disc 213 remains stationary, and the wiping plate 215a is stationary against the outer wall of the coil 5 and does not rotate with the drive shaft 205. When the sewage level in tank 2 rises and the airbag ring 6 floats to a high position, the mounting shaft 210 moves upward with the airbag ring 6, and the top plate 210b moves upward synchronously with the mounting shaft 210 and is inserted into the docking groove 213a. The multiple snapping inclined surfaces 210c on the top of the top plate 210b abut against the groove wall of the docking groove 213a. When the top plate 210b rotates with the synchronous sliding shaft 209, the snapping inclined surfaces 210c slide over the opening of the docking groove 213a and snap together, locking the top plate 210b and the clutch disc 213 circumferentially. The clutch disc 213 then rotates synchronously with the drive shaft 205, and drives the pad 215 and the wiping plate 215a to rotate around the axis of the recovery tank 2 via the connecting rod 214. The wiping plate 215a sweeps along the spiral path of the outer wall of the coil 5 to wipe away the impurities attached to the outer wall of the coil 5. During the rotation of the wiping plate 215a, the stirring rod 208 rotates with the drive shaft 205 and periodically passes the position of the wiping plate 215a. The wiping plate 215a is made of flexible material and undergoes elastic deformation when squeezed by the stirring rod 208, separating from the coil 5. After the stirring rod 208 passes, the wiping plate 215a returns to its original shape and simultaneously wipes away impurities on the stirring rod 208 in the opposite direction. When the wiping plate 215a rotates, the synchronous sleeve 216 rotates around the support rod 211 with the pad 215 and moves with the support rod. The lifting and lowering of 211 slides along the support rod 211. The relative rotation and relative sliding of the synchronous sleeve 216 and the support rod 211 do not interfere with each other, ensuring that the pad 215 and the wiping plate 215a do not get stuck due to the displacement of the support rod 211 during rotation. The wiping plate 215a is always in contact with the outer wall of the coil 5, and the outer wall of the stirring rod 208 is kept separate from the coil 5. The flexible nature of the wiping plate 215a allows the stirring rod 208 to pass through the wiping plate 215a when separated from the coil 5. When the sewage level in the recovery tank 2 drops, the airbag ring 6 sinks, the mounting shaft 210 and the top plate 210b move down, the top plate 210b disengages from the docking groove 213a, the fastening inclined surface 210c is released from fastening, the clutch disc 213 stops rotating, and the wiping plate 215a stops rotating and rests against the outer wall of the coil 5. A follower disk 206 is fixed to the middle of the drive shaft 205. The follower disk 206 is disc-shaped and horizontally arranged. The follower disk 206 is coaxial with the drive shaft 205 and rotates synchronously with the drive shaft 205. A bent plate 207 is fixed to the outer circumference of the follower disk 206. The bent plate 207 extends radially outward along the follower disk 206 and then bends downward. The lower end of the bent plate 207 is fixedly connected to a stirring rod 208. The stirring rod 208 extends downward from the lower end of the bent plate 207 and is suspended in the sewage in the recovery tank 2. The top of the bent plate 207 is higher than the top of the scrubbing plate 215a, so that the stirring rod 208... When the stirring rod 208 rotates around the drive shaft 205, the rotation of the stirring rod 208 covers the rotation range of the wiping plate 215a. That is, the circumferential trajectory of the stirring rod 208 rotating around the drive shaft 205 overlaps with the circumferential trajectory of the wiping plate 215a rotating around the drive shaft 205 in the axial projection. Moreover, the rotation height range of the stirring rod 208 covers the height range of the wiping plate 215a. This ensures that the stirring rod 208 will pass through the position of the wiping plate 215a and make contact with the wiping plate 215a once for each rotation of the drive shaft 205, without colliding with the wiping plate 215a and the connecting rod 214. When the drive shaft 205 rotates, it drives the follower disk 206 to rotate synchronously. The follower disk 206 drives the stirring rod 208 to rotate around the axis of the drive shaft 205 via the bending plate 207. The stirring rod 208 agitates the sewage in the recovery tank 2, keeping impurities in the sewage suspended and preventing impurities from settling at the bottom of the recovery tank 2 and on the outer wall of the coil 5. During the rotation of the stirring rod 208 around the drive shaft 205, it periodically passes the position of the wiping plate 215a and comes into contact with the flexible wiping plate 215a. The stirring rod 208 squeezes the wiping plate 215a. a. The wiping plate 215a undergoes elastic deformation. After the stirring rod 208 passes by, the wiping plate 215a returns to its original shape. During the recovery process, the wiping plate 215a wipes away the impurities attached to the stirring rod 208 in the opposite direction, keeping the stirring rod 208 clean. At the same time, the rotation of the stirring rod 208 causes the sewage in the recovery tank 2 to be disturbed. The disturbed water flow washes the outer wall of the coil 5. Combined with the intermittent wiping of the wiping plate 215a, the adhesion of impurities to the outer wall of the coil 5 is further reduced, maintaining the heat exchange efficiency between the wall of the coil 5 and the sewage.

[0034] The turbine 3 and the return water pump 4 are rigidly connected by a drive shaft 7. When the boiler 1 discharges sewage, the turbine 3 rotates, and the turbine 3 drives the return water pump 4 to rotate synchronously at a corresponding speed via the drive shaft 7. This ensures that the sewage flow rate entering the recovery tank 2 corresponds one-to-one with the clean water flow rate entering the coil 5 and increases or decreases synchronously. No additional flow control components are needed. When the sewage inflow is large, the turbine 3 rotates at a high speed, and the return water pump 4 rotates at a high speed accordingly, and the clean water flow rate in the coil 5 increases accordingly. When the sewage inflow is small, the turbine 3 rotates at a low speed, and the return water pump 4 rotates at a low speed accordingly, and the clean water flow rate in the coil 5 decreases accordingly. The synchronous entry of sewage and clean water keeps the heat exchange conditions matched. The sewage discharge of the boiler 1 fluctuates, but the clean water flow rate in the coil 5 is adapted to the sewage volume in the recovery tank 2, avoiding the situation where a large amount of sewage accumulates and there is insufficient clean water, or excessive clean water and insufficient waste heat from sewage. When the water level is high, there are many impurities deposited in the recovery tank 2. At this time, the amount of sewage entering is large, the speed of the water turbine 3 is high, and the amount of clean water driven by the return water pump 4 into the coil 5 is also large. The top coil 5 is submerged by sewage. Wiping the top coil 5 and removing impurities from its outer wall to maintain heat exchange efficiency is of practical significance. Therefore, at this time, the air bag ring 6 floats to a high position as the amount of sewage increases, pushing the top plate 210b to insert into the docking groove 213a and engage. The clutch disc 213 rotates synchronously with the drive shaft 205, driving the wiping plate 215a to rotate and wipe away impurities from the outer wall of the coil 5. When the initial water level is low, there are few impurities and little clean water, so the wiping plate 215a does not rotate, avoiding ineffective rotation and wear at low water levels. When the boiler 1's blowdown volume decreases and the wastewater's own output rate decreases, the wastewater flow rate entering the recovery tank 2 decreases, the liquid level in the recovery tank 2 drops, the drainage rate of the drain outlet 202a is greater than the wastewater's inflow rate, the air bladder ring 6 sinks with the liquid level, the opening and closing cone 212 moves down, the opening of the drain outlet 202a decreases accordingly, and the drainage flow rate decreases accordingly, restoring the balance between drainage and inflow. At the same time, the decrease in wastewater flow rate causes the turbine 3's speed to decrease, the return water pump 4's speed to slow down, and the clean water discharge rate in the coil 5 decreases accordingly. Since less wastewater can only provide less heat, the synchronous rotation of the return water pump 4 and the turbine 3 causes the clean water discharge rate to decrease synchronously with the wastewater volume, and the residence time of the clean water in the coil 5 is correspondingly extended. Thus, under the condition of insufficient waste heat from wastewater, the limited waste heat is utilized more fully, the clean water receives more preheating, and the heat exchange effect is optimized.

[0035] A method for recycling boiler wastewater includes the following steps: a. Wastewater from boiler 1 enters turbine 3 through the wastewater outlet of boiler 1, driving turbine 3 to rotate. Turbine 3 drives return water pump 4 to rotate synchronously through drive shaft 7. Wastewater enters recovery tank 2 through turbine 3. b. The return water pump 4 sends clean water into the coil 5. The clean water in the coil 5 exchanges heat with the sewage in the recovery tank 2 through the wall of the coil 5. c. When the sewage level in the recovery tank 2 rises, the airbag ring 6 floats up with the sewage level, driving the synchronous sliding shaft 209, the mounting shaft 210 and the opening and closing cone 212 to move upward synchronously. The opening and closing cone 212 disengages from the drain outlet 202a, opening the drain outlet 202a to discharge sewage. When the sewage level drops, the airbag ring 6 sinks down with the water level, and the opening and closing cone 212 resets and closes the drain outlet 202a. The degree of opening of the drain outlet 202a increases with the increase of the airbag ring 6's floating amount, so that the drainage flow rate is adapted to the inflow flow rate. d. When the sewage level continues to rise until the airbag ring 6 pushes the top plate 210b into the docking groove 213a and engages, the clutch disc 213 rotates synchronously with the drive shaft 205, driving the wiping plate 215a to rotate and wipe away impurities from the outer wall of the coil 5. By mounting the airbag ring 6 on the installation shaft 210 and allowing it to float with the sewage water level in the recovery tank 2, when the airbag ring 6 floats up, it drives the opening and closing cone block 212 to move upward and separate from the drain outlet 202a, opening the drain outlet 202a to discharge sewage. It also pushes the top plate 210b upward and inserts it into the docking groove 213a, which is then fastened by the fastening inclined surface 210c. This causes the clutch disc 213 to rotate synchronously with the drive shaft 205, driving the wiping plate 215a to wipe away impurities on the outer wall of the coil 5. This achieves simultaneous control of the two functions of sewage discharge and descaling with a single component. It can automatically complete sewage discharge and descaling with changes in water level without the need for an electrical control system or external energy. The structure is simple, the operation is reliable, and the manufacturing cost of the device is reduced.

[0036] The turbine 3 and the return water pump 4 are connected by a drive shaft 7. The sewage from the boiler 1 drives the turbine 3 to rotate and synchronously drives the return water pump 4 to rotate. This enables the sewage flow rate entering the recovery tank 2 and the clean water flow rate entering the coil 5 to increase or decrease synchronously. No additional flow control mechanism is needed to ensure that the heat exchange conditions are always matched. This avoids the situation where a large amount of sewage accumulates and there is insufficient clean water, or excessive clean water and insufficient waste heat from the sewage. It can still operate stably and adaptively when the sewage discharge of the boiler 1 fluctuates.

[0037] The recycling tank 2 is equipped with a coil 5 connected to the return water pump 4. The return water pump 4 sends clean water into the coil 5. The clean water in the coil 5 exchanges heat with the sewage in the recycling tank 2 through the wall of the coil 5, realizing the recovery and utilization of the waste heat of the continuous discharge sewage from the boiler 1. The preheated clean water flows back to the feed water tank of the boiler 1 and is pressurized by the boiler 1 before entering the furnace, which reduces the energy consumption required by the boiler 1 to heat the clean water and realizes energy recovery.

[0038] By using the opening and closing cone 212 to close the drain outlet 202a by its own weight and the sewage pressure inside the recovery tank 2, and the air bladder ring 6 to move the opening and closing cone 212 up and down with the rise and fall of the water level, the opening degree of the drain outlet 202a changes continuously with the sewage water level. When the water level rises, the upward movement of the opening and closing cone 212 increases, the opening of the drain outlet 202a increases, and the drainage flow increases. The drainage flow and the inflow flow are automatically balanced. When the water level falls, the opening and closing cone 212 moves down to reset, and the drain outlet 202a closes. This achieves adaptive sewage discharge when the water volume is large and sewage remains in the recovery tank 2 when the water volume is small, without the need for manual intervention or electronic control adjustment.

[0039] By inserting the top plate 210b into the docking groove 213a and engaging with the clutch disc 213 only when the airbag ring 6 floats to a high position, the cleaning plate 215a is driven to rotate for descaling only when the sewage level is high, there is a lot of impurity deposited in the tank, the top coil 5 is submerged in sewage, and the heat exchange demand is real. When the water level is low, the top plate 210b separates from the docking groove 213a, the clutch disc 213 does not rotate, and the cleaning plate 215a remains stationary. This avoids ineffective rotation and wear of the cleaning plate 215a under low water level conditions and extends the service life of the cleaning plate 215a.

[0040] By synchronously changing the speed of the return water pump 4 with the speed of the turbine 3, the speed of the return water pump 4 is reduced accordingly when the boiler 1 discharges less wastewater and the waste heat is reduced. The discharge speed of the clean water in the coil 5 is slowed down and the residence time of the clean water in the coil 5 is extended, so that the limited waste heat of the wastewater is more fully transferred to the clean water, the clean water receives more preheating, and the heat exchange effect under low load conditions is optimized.

[0041] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A boiler continuous drain recycling device, characterized by: The system includes a boiler (1), a recovery tank (2), a water turbine (3), and a return water pump (4). A drive shaft (7) is provided between the water turbine (3) and the return water pump (4). The sewage outlet of the boiler (1) is connected to the water turbine (3). The sewage from the boiler (1) drives the water turbine (3) to rotate. The water turbine (3) drives the return water pump (4) to rotate synchronously via the drive shaft (7). The water turbine (3) is connected to the recovery tank (2). The recovery tank (2) is equipped with a coil (5) that connects to the return water pump (4). The top of the recycling tank (2) is provided with a drive shaft (205). Inside the drive shaft (205) is a synchronous sliding shaft (209) that rotates synchronously with the drive shaft (205) and can slide up and down. The bottom of the synchronous sliding shaft (209) is connected to an installation shaft (210). An airbag ring (6) that floats with the sewage level in the recycling tank (2) is sleeved in the middle section of the installation shaft (210). A top plate (210b) is fixed to the top of the installation shaft (210), and an opening and closing cone block (212) is fixed to the bottom of the installation shaft (210). The bottom of the recycling tank (2) is provided with a connection to the opening and closing cone block (212). The drain outlet (202a) is opened and closed. The opening and closing cone block (212) floats up with the airbag ring (6) and disengages from the drain outlet (202a) to discharge sewage. The bottom of the drive shaft (205) is provided with a clutch disc (213). The clutch disc (213) is provided with a wiping plate (215a). The bottom of the clutch disc (213) is provided with a docking groove (213a). The airbag ring (6) floats up and pushes the top plate (210b) to insert into the docking groove (213a) and engage, so that the clutch disc (213) rotates synchronously with the drive shaft (205) to drive the wiping plate (215a) to wipe away impurities on the outer wall of the coil (5).

2. A boiler continuous drain recovery device according to claim 1, characterized in that: A follower disk (206) is fixed in the middle of the drive shaft (205). A curved plate (207) is provided on the outer circumference of the follower disk (206). The curved plate (207) bends downward. A stirring rod (208) is fixed at the bottom of the curved plate (207). The top of the curved plate (207) is higher than the top of the wiping plate (215a). The curved plate (207) causes the stirring rod (208) to cover the rotation range of the wiping plate (215a) when it rotates around the drive shaft (205). The stirring rod (208) rotates and wipes away impurities on the rod body through the wiping plate (215a).

3. The boiler continuous drain recovery device of claim 2, wherein: A support rod (211) is provided between the mounting shaft (210) and the opening and closing cone (212) so that the bottom of the opening and closing cone (212) is located inside the drain outlet (202a). The bottom of the mounting shaft (210) is also fixed with a support plate (210a) located at the top of the support rod (211). The support plate (210a) is used to support the bottom of the airbag ring (6). The airbag ring (6) is located between the support plate (210a) and the top plate (210b) of the mounting shaft (210) to position the airbag ring (6).

4. The boiler continuous drain recovery device of claim 3, wherein: A connecting rod (214) is fixed to the outer circumference of the clutch disc (213). The connecting rod (214) is used to connect the pad (215) and the clutch disc (213). The length of the connecting rod (214) is less than the length of the bent plate (207). The wiping plate (215a) is made of flexible material to adapt to the extrusion of the stirring rod (208). A synchronizing rod (217) is fixed to the bottom of one side of the pad (215). A synchronizing sleeve (216) is fixed to the end of the synchronizing rod (217). The synchronizing sleeve (216) is sleeved on the middle section of the support rod (211).

5. The boiler continuous drain recovery device of claim 1, wherein: The top plate (210b) has multiple snap-fit ​​inclined surfaces (210c) on its top. After the top plate (210b) is inserted into the docking groove (213a), it rotates with the synchronous sliding shaft (209) and snaps the snap-fit ​​inclined surfaces (210c) into the docking groove (213a). The synchronous sliding shaft (209) is a polygonal column to ensure that the synchronous sliding shaft (209) and the drive shaft (205) slide up and down and maintain synchronous rotation.

6. The boiler continuous drain recovery device of claim 1, wherein: The bottom of the recycling tank (2) is provided with an installation groove (218), and an opening and closing plate (202) is fixed in the installation groove (218). The drain outlet (202a) is located in the middle of the opening and closing plate (202), and the drain outlet (202a) is a tapered opening with a diameter that gradually decreases from top to bottom. The opening and closing cone (212) is adapted to the drain outlet (202a), and the bottom of the opening and closing cone (212) is provided with an arc-shaped connector (212a) to guide the opening and closing cone (212). The bottom of the opening and closing plate (202) is fixed with a drain pipe (203) that connects to the drain outlet (202a), and the bottom of the recycling tank (2) is fixed with multiple brackets (204). The brackets (204) are used to raise the distance between the recycling tank (2) and the mounting surface to avoid the drain pipe (203). The top of the recycling tank (2) is fixed with a motor (201), and the output shaft of the motor (201) is fixed on the top of the drive shaft (205).

7. The boiler continuous drain recovery device of claim 1, wherein: The water turbine (3) is equipped with multiple water turbine blades (301) that rotate inside. The shaft ends of the multiple water turbine blades (301) rotate synchronously with the drive shaft (7), and the other end of the drive shaft (7) is fixedly connected to the rotating shaft of the return water pump (4).

8. The boiler continuous drain recovery device of claim 7, wherein: The water turbine (3) is fixed to the mounting surface by the water turbine frame (302), and a sewage pipe (304) is fixed at the outlet of the water turbine (3). A pipe frame (303) is fixed in the middle of the sewage pipe (304), and a connecting pipe (305) is connected to the end of the sewage pipe (304). The connecting pipe (305) is connected to the inside of the recycling tank (2).

9. The boiler continuous drain recovery device of claim 1, wherein: The bottom of the return water pump (4) is fixed with a return water rack (403). The inlet of the return water pump (4) is connected to a clean water pipe (401). The clean water pipe (401) is connected to an external clean water source. The outlet of the return water pump (4) is provided with a water supply pipe (402) connected to the inlet of the coil (5). The outlet of the coil (5) is provided with a water outlet head (501). The water outlet head (501) is connected to the feed water tank of the boiler (1). The boiler (1) pressurizes the water into the boiler. The coil (5) is a spiral rising pipe and fits the inner wall of the recovery tank (2).

10. The method of claim 1, wherein Includes the following steps: a. Wastewater from boiler (1) enters the turbine (3) through the wastewater outlet of boiler (1), driving the turbine (3) to rotate. The turbine (3) drives the return water pump (4) to rotate synchronously through the transmission shaft (7). Wastewater enters the recovery tank (2) through the turbine (3). b. The return water pump (4) sends clean water into the coil (5). The clean water in the coil (5) exchanges heat with the sewage in the recovery tank (2) through the wall of the coil (5). c. When the sewage level in the recovery tank (2) rises, the airbag ring (6) floats up with the sewage level, driving the synchronous sliding shaft (209), the mounting shaft (210) and the opening and closing cone (212) to move up synchronously. The opening and closing cone (212) disengages from the drain outlet (202a) and opens the drain outlet (202a) to discharge sewage. When the sewage level drops, the airbag ring (6) sinks down with the water level, and the opening and closing cone (212) resets and closes the drain outlet (202a). The degree of opening of the drain outlet (202a) increases with the increase of the airbag ring (6) floating, so that the drainage flow rate is adapted to the inflow flow rate. d. When the sewage level continues to rise to the point that the airbag ring (6) pushes the top plate (210b) into the docking groove (213a) and engages, the clutch disc (213) rotates synchronously with the drive shaft (205), causing the wiping plate (215a) to rotate and wipe away impurities from the outer wall of the coil (5).

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