Continuous discharge waste heat recovery device capable of enhancing atomization

Abstract

The continuous exhaust waste heat recovery device capable of enhancing atomization comprises a shell, a steam inlet and a steam outlet are formed in the shell, and an atomization assembly and a centrifugal filtering assembly are arranged in the shell; after continuous drainage enters the water inlet pipe, one part of the continuous drainage is refined through the through holes in the flow guide plate, the other part of the continuous drainage is sprayed to the flow guide plate through the flow guide pipe and the flow guide spray head, the flow guide plate rotates at a high speed under the pressure action of the continuous drainage, and continuous drainage beads sprayed out by the flow guide spray head impact the flow guide plate and are secondarily scattered by the rotating flow guide plate. Meanwhile, continuous drainage water beads thrown out from the through holes of the flow guide plate are mutually impacted to form a mutual multiple scattering state, the continuous drainage water is fully atomized and is atomized to the steam inlet in a 360-degree scattering state, the contact area with superheated steam is greatly increased, the atomized continuous drainage water can absorb heat more fully, and the atomization effect of the superheated steam is improved. And the vaporization efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of boilers, in particular to a continuous waste heat recovery device. Background Art

[0002] Boiler blowdown is a major loss in boiler operation. In order to control the quality of boiler water and steam, two parts of boiler wastewater must be discharged. The first part is continuous blowdown, also known as surface blowdown, which requires continuous discharge of part of the boiler water from the part with the highest salt and alkali concentration to reduce the salt content, alkali content, silica content and suspended slag content in the boiler water. The second part is regular blowdown, also known as bottom blowdown, which needs to be discharged from the bottom of the boiler regularly. Among them, continuous blowdown accounts for 90% of the total blowdown.

[0003] The purpose of sewage discharge is to protect the quality of boiler water so that the boiler can operate safely and stably for a long time. However, directly discharging sewage will not only cause heat loss and affect boiler efficiency, but also cause thermal pollution to the environment.

[0004] The "a kind of continuous row waste heat recovery system" mentioned in the patent number "ZL2022223707411" "comprises a continuous row waste heat recovery device, a steam inlet pipe, a steam outlet pipe and a continuous row water inlet pipe, one end of the continuous row water inlet pipe is used to introduce continuous row water, and the other end is connected to the steam inlet pipe; one end of the steam inlet pipe is used to introduce superheated steam, and the other end is connected to the continuous row waste heat recovery device; the continuous row waste heat recovery device is used to purify the mixed steam of vaporized continuous row water and superheated steam, and the steam outlet pipe is used to lead out the mixed steam purified by the continuous row waste heat recovery device", "also includes an atomizing device, the atomizing device is arranged at the connection between the continuous row water inlet pipe and the steam inlet pipe, and is used to atomize the continuous row water". Although it is disclosed that the continuous row water is first atomized by using the atomizing device, "the atomizing device 11 is a plurality of nozzles", and its atomization effect needs to be considered. In the case of incomplete atomization, the subsequent continuous row water will not be completely vaporized, so that part of the liquid is deposited in the shell, affecting the recovery efficiency. Utility Model Content

[0005] In view of the above problems, the utility model proposes an enhanced atomization continuous waste heat recovery system.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A continuous waste heat recovery device with enhanced atomization, comprising a shell, the shell is provided with a steam inlet and a steam outlet, the steam inlet is used to introduce superheated steam, the steam outlet is used to lead out clean steam, and an atomization component and a centrifugal filter component are arranged in the shell;

[0008] The atomizing assembly comprises a water inlet pipe, a guide pipe, a guide nozzle and a plurality of guide plates. One end of the water inlet pipe is used to introduce continuous drainage, and the other end is arranged in the shell; the guide plate is arranged in the shell in a radial ring shape and is located at the steam inlet, and is rotatably connected to the water inlet pipe through a bearing, and the guide plate is a hollow plate, which is connected to the inside of the water inlet pipe, and a plurality of evenly distributed through holes are also provided on both sides of the guide plate; one end of the guide pipe is connected to the water inlet pipe, and the other end is connected to the guide nozzle; the guide nozzle is used to impact the continuous drainage in the water inlet pipe onto the guide plate;

[0009] The centrifugal filter assembly is detachably mounted in the housing and is used for centrifugally filtering the vaporized mixed gas of the waste water and the superheated steam into clean steam.

[0010] In one embodiment of the utility model, the atomization assembly further includes a connecting frame and a conical disperser fixed in the water inlet pipe through the connecting frame, the tip of the conical disperser is arranged opposite to the direction of water flow, and a plurality of hemispherical protrusions are arranged on the surface of the conical disperser.

[0011] In one embodiment of the utility model, the centrifugal filter assembly includes a fixed plate, a bearing, a spiral blade and a plurality of filter tubes; the fixed plate is used to connect the filter tube to the housing, and the fixed plate is sealed to the housing; the filter tube is rotatably connected to the fixed plate through the bearing, and the spiral blade is fixed to the inner wall of the filter tube;

[0012] One end of the filter tube close to the steam inlet is an open end, and the other end is a closed end; the interior of the filter tube is connected to the steam inlet through the open end; the filter tube includes a ceramic layer, a polytetrafluoroethylene filter layer, a hollow fiber ultrafiltration layer, a NF nanofiltration layer and a unidirectional filter membrane layer in sequence along the steam filtration direction.

[0013] In one embodiment of the present invention, the spiral blade is a ceramic blade.

[0014] In one embodiment of the utility model, the shell is further provided with an assembly port, through which the centrifugal filter assembly is installed in the shell; a sealing assembly is also provided between the assembly port and the shell, the sealing assembly includes an end cover, a sealing ring and an elastic fastener, a connecting flange is provided on the assembly port, the end cover and the connecting flange are connected by fastening bolts, the sealing ring is arranged between the end cover and the connecting flange, and the elastic fastener is used for secondary fastening of the end cover and the connecting flange.

[0015] In one embodiment of the utility model, the elastic fastener includes a fastening block 1, a fastening block 2, a connecting block and a spring, the fastening block 1 and the fastening block 2 are respectively fixed at two ends of the connecting block, the fastening block 1 is fixedly connected to the connecting flange, one end of the spring is arranged on the inner side of the fastening block 2, and the other end is arranged on the end cover, and the distance between the fastening block 2 and the end cover is less than the free length of the spring.

[0016] In one embodiment of the utility model, the fastening bolt includes a screw and a nut; the stud of the screw is provided with a first thread and a second thread in opposite directions, the first thread matches the internal thread on the end cover and the connecting flange, and the second thread matches the nut.

[0017] The beneficial effect of the utility model is that the atomizing assembly arranged in the continuous waste heat recovery device, after the continuous waste water enters the water inlet pipe, enters the guide plate along the inside of the water inlet pipe, and then comes out from the through hole on the guide plate, and the continuous waste water is dispersed and refined.

[0018] One end of the guide pipe is connected to the water inlet pipe, and the other end is connected to the guide nozzle; the guide nozzle is used to impact the continuous drainage water in the water inlet pipe onto the guide plate. Part of the continuous drainage water is refined through the through holes on the guide plate, and the other part is sprayed onto the guide plate through the guide pipe and the guide nozzle. The guide plate rotates at high speed under the pressure of the continuous drainage water, and the continuous drainage water beads sprayed by the guide nozzle impact the guide plate, and are broken up by the rotating guide plate for the second time. At the same time, they also impact each other with the continuous drainage water beads ejected from the through holes of the guide plate, forming a state of multiple mutual dispersion. The continuous drainage water has a full atomization effect, and is atomized to the steam inlet in a 360° dispersed state, which greatly increases the contact area with the superheated steam, so that the atomized continuous drainage water can absorb heat more fully, effectively improving the vaporization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the continuous waste heat recovery device for enhanced atomization in this embodiment;

[0020] Figure 2 It is a schematic diagram of the atomization assembly viewed from above;

[0021] Figure 3 yes Figure 2 Schematic diagram of the middle CC section;

[0022] Figure 4 It is a schematic diagram of a conical disperser and a connecting frame;

[0023] Figure 5 yes Figure 4 Schematic diagram looking up;

[0024] Figure 6 yes Figure 1 A local enlarged schematic diagram of the middle A;

[0025] Figure 7 yes Figure 1 A partial enlarged schematic diagram of point B in the middle;

[0026] Figure 8 It is a schematic diagram of the cross-section of the filter tube and the various filter layers.

[0027] The reference numerals in the figures are:

[0028] 1. Shell, 2. Steam inlet, 3. Steam outlet, 4. Atomization assembly, 5. Water inlet pipe, 6. Guide pipe, 7. Guide nozzle, 8. Guide plate, 9. Connecting frame, 10. Conical disperser, 11. Centrifugal filter assembly, 12. Fixed plate, 13. Bearing, 14. Spiral blade, 15. Filter tube, 16. Assembly port, 17. Annular boss, 18. Sealing assembly, 19. End cover, 20. Sealing ring, 21. Elastic Fasteners, 22, connecting flange, 23, fastening block one, 24, fastening block two, 25, connecting block, 26, spring, 27, screw, 28, nut, 29, ceramic layer, 30, polytetrafluoroethylene filter layer, 31, hollow fiber ultrafiltration layer, 32, NF nanofiltration layer, 33, one-way filter membrane layer, 34, pressure detection port one, 35, pressure detection port two, 36, flushing port, 37, flushing nozzle, 38, sewage outlet. DETAILED DESCRIPTION

[0029] The utility model is described in detail below in conjunction with the accompanying drawings.

[0030] Example

[0031] See also Figure 1-8 A continuous waste heat recovery device with enhanced atomization includes a shell 1, on which a steam inlet 2 and a steam outlet 3 are provided. The steam inlet 2 is used to introduce superheated steam, and the steam outlet 3 is used to output clean steam. An atomization component 4 and a centrifugal filter component 11 are provided in the shell 1.

[0032] The atomizing assembly 4 includes a water inlet pipe 5 , a flow guide pipe 6 , a flow guide nozzle 7 and a plurality of flow guide plates 8 .

[0033] One end of the water inlet pipe 5 is used to introduce continuous drainage, and the other end is arranged in the shell 1. The guide plate 8 is arranged in the shell 1 in a radial ring shape and is located at the steam inlet 2. It is rotatably connected to the water inlet pipe 5 through a bearing 13. The guide plate 8 is a hollow plate and communicates with the inside of the water inlet pipe 5. A number of evenly distributed through holes are also provided on both sides of the guide plate 8. One end of the guide pipe 6 is connected to the water inlet pipe 5, and the other end is connected to the guide nozzle 7. The guide nozzle 7 is used to impact the continuous drainage in the water inlet pipe 5 onto the guide plate 8.

[0034] The atomizing assembly 4 arranged in the continuous waste heat recovery device, after the continuous drainage enters the water inlet pipe 5, enters the guide plate 8 along the inside of the water inlet pipe 5, and then comes out from the through hole on the guide plate 8, the continuous drainage is dispersed and refined.

[0035] One end of the guide pipe 6 is connected to the water inlet pipe 5, and the other end is connected to the guide nozzle 7; the guide nozzle 7 is used to impact the continuous drainage in the water inlet pipe 5 onto the guide plate 8. A part of the continuous drainage is refined through the through hole on the guide plate 8, and the other part is sprayed onto the guide plate 8 through the guide pipe 6 and the guide nozzle 7. The guide plate 8 rotates at a high speed under the pressure of the continuous drainage. The continuous drainage beads sprayed by the guide nozzle 7 impact the guide plate 8, and are broken up twice by the rotating guide plate 8. At the same time, they also impact each other with the continuous drainage beads ejected from the through hole of the guide plate 8, forming a state of multiple mutual dispersion. The continuous drainage has a sufficient atomization effect, and is atomized to the steam inlet 2 in a 360° dispersed state, which greatly increases the contact area with the superheated steam, so that the atomized continuous drainage can absorb heat more fully, effectively improving the vaporization efficiency.

[0036] The atomizing assembly 4 also includes a connecting frame 9 and a conical disperser 10 fixed in the water inlet pipe 5 through the connecting frame 9. The tip of the conical disperser 10 is arranged opposite to the direction of the water flow, and a plurality of hemispherical protrusions are arranged on the surface of the conical disperser 10. After the continuous drainage enters the water inlet pipe 5, it first impacts the conical disperser 10, is dispersed by the tip of the conical disperser 10, and then impacts the hemispherical protrusions on the surface of the conical disperser 10, first being dispersed, and then with the subsequent function of the guide plate 8 and the guide nozzle 7, it is more helpful to improve the atomization effect.

[0037] The centrifugal filter assembly 11 is detachably mounted in the housing 1 and is used for centrifugally filtering the vaporized mixed gas of the waste water and the superheated steam into clean steam.

[0038] The centrifugal filter assembly 11 includes a fixed plate 12, a bearing 13, a spiral blade 14 and a plurality of filter tubes 15. The fixed plate 12 is used to connect the filter tube 15 to the housing 1, and the fixed plate 12 is sealed to the housing 1. The filter tube 15 is rotatably connected to the fixed plate 12 through the bearing 13, and the spiral blade 14 is fixed to the inner wall of the filter tube 15. In this embodiment, the spiral blade 14 is a ceramic blade.

[0039] The mixed steam enters the continuous waste heat recovery device through the steam inlet 2. A centrifugal filter assembly 11 is arranged in the shell 1, and the filter tube 15 is rotatably connected to the fixed plate 12 through the bearing 13. After the mixed steam enters the filter tube 15, the steam with impurities acts on the spiral blade 14 of the filter tube 15, driving the spiral blade 14 to drive the filter tube 15 to rotate together, so that the subsequent steam is thrown onto the filter tube 15 along the direction of the spiral blade 14. When filtering, in addition to the pressure brought by the steam itself, it is also affected by the centrifugal force, which enhances the filtering effect.

[0040] Impurities in the steam remain on the filter tube 15, and the clean steam that passes through the filter tube 15 is led out from the steam outlet 3 and enters the steam outlet pipe. The other end of the steam outlet pipe is connected to the heating main pipe to lead the filtered clean steam back to the heating main pipe of the power plant.

[0041] The housing 1 is also provided with an assembly port 16, through which the centrifugal filter assembly 11 is detachably mounted in the housing 1. An integrated annular boss 17 is provided on the inner wall of the housing 1, and an internal thread is provided on the annular boss 17; the fixing plate 12 is disc-shaped, and an external thread is provided on the outer ring of the fixing plate 12, and the fixing plate 12 is connected to the annular boss 17 by threads. When the filter tube 15 is worn out due to long-term use and needs to be replaced, the entire centrifugal filter assembly 11 can be disassembled by removing the fixing plate 12, and then the filter tube 15 can be replaced.

[0042] A sealing assembly 18 is further provided between the assembly opening 16 and the housing 1 .

[0043] The sealing assembly 18 includes an end cover 19, a sealing ring 20 and an elastic fastener 21. A connecting flange 22 is provided on the assembly opening 16, and the end cover 19 and the connecting flange 22 are connected by fastening bolts. The sealing ring 20 is arranged between the end cover 19 and the connecting flange 22, and the elastic fastener 21 is used to fasten the end cover 19 and the connecting flange 22 for a second time.

[0044] The elastic fastener 21 arranged at the assembly port 16 can perform secondary tightening of the end cover 19 and the connecting flange 22. When the fastening bolt connection breaks, the force of the elastic fastener 21 can prevent the end cover 19 and the connecting flange 22 at the broken fastening bolt from instantly losing force and causing an accident, thereby improving the safety of the device.

[0045] The elastic fastener 21 includes a fastening block 1 23 , a fastening block 24 , a connecting block 25 and a spring 26 .

[0046] The fastening block 1 23 and the fastening block 24 are fixed at both ends of the connecting block 25, respectively. The fastening block 1 23 is fixedly connected to the connecting flange 22. One end of the spring 26 is arranged inside the fastening block 24, and the other end is arranged on the end cover 19. The distance between the fastening block 24 and the end cover 19 is smaller than the free length of the spring 26. The spring 26 is in a compressed state, and the rebound thrust of the spring 26 acts on the fastening block 24 and the end cover 19 respectively. At the same time, the fastening block 24 is fixedly connected to the fastening block 1 23 through the connecting block 25, and the fastening block 1 23 is fixedly connected to the connecting flange 22, so that the end cover 19 and the connecting flange 22 form a secondary fastening connection.

[0047] One end of the filter tube 15 close to the steam inlet 2 is an open end, and the other end is a closed end. The interior of the filter tube 15 is connected to the steam inlet 2 through the open end. Steam with impurities enters the continuous waste heat recovery system through the steam inlet 2 and then enters the interior of the filter tube 15 through the open end.

[0048] The fastening bolts include a screw 27 and a nut 28. The stud of the screw 27 is provided with a first thread and a second thread in opposite directions, the first thread matches the internal thread on the end cover 19 and the connecting flange 22, and the second thread matches the nut 28. Since the directions of the first thread and the second thread are opposite, when the first thread and the internal thread on the end cover 19 and the connecting flange 22 tend to loosen, the force generated is opposite to the force of the nut 28, thereby reducing the possibility of loosening of the fastening bolt and enhancing the reliability of the connection between the end cover 19 and the connecting flange 22.

[0049] The filter tube 15 includes a ceramic layer 29, a polytetrafluoroethylene filter layer 30, a hollow fiber ultrafiltration layer 31, a NF nanofiltration layer 32 and a unidirectional filter membrane layer 33 in the steam filtering direction. The spiral blade 14 is a ceramic blade, and the spiral blade 14 and the ceramic layer 29 of the filter tube 15 are an integrally formed structure.

[0050] The steam with impurities is filtered through the ceramic layer 29, the polytetrafluoroethylene filter layer 30, the hollow fiber ultrafiltration layer 31, the NF nanofiltration layer 32 and the unidirectional filter membrane layer 33 in sequence. The ceramic layer 29 first filters the impurities with larger particles in the steam, and then passes through the polytetrafluoroethylene layer to filter the impurities with a particle size between 0.1 and 0.3 μm. The hollow fiber ultrafiltration layer 31 continues to intercept impurities with a size between 0.01 and 0.1 μm, and the NF nanofiltration layer 32 can intercept impurities larger than 0.001 μm. Finally, it passes through the unidirectional filter membrane layer 33 and is discharged from the steam outlet 3. The unidirectional filter membrane layer 33 can prevent the clean steam from backflowing.

[0051] The steam inlet 2 is also provided with a pressure detection port 1 34, and the steam outlet 3 is provided with a pressure detection port 2 35, which are respectively used to detect the steam pressure before and after passing through the filter assembly.

[0052] The steam pressure before and after filtration is detected in real time through the pressure detection port 1 34 and the pressure detection port 2 35. On the one hand, the blockage condition of the filter tube 15 can be judged by the pressure difference, and on the other hand, the perforation condition of the filter tube 15 can be judged by the pressure difference, thereby ensuring that the filter tube 15 is in a normal and usable state.

[0053] Pressure detection port one 34 and pressure detection port two 35 are connected to the DCS control system in the power plant, and can transmit pressure parameters to the DCS control system. The user can directly see the pressure detection conditions of the two pressure detection ports and the pressure difference between the two places on the DCS control system. When designing the continuous waste heat recovery device, the pressure difference parameters can be set according to the actual operating conditions and requirements of the power plant. When the pressure difference exceeds the set parameters, it means that the filter tube 15 in the shell 1 has formed a certain degree of blockage, and the user can suspend the use of the continuous waste heat recovery system and clean and maintain it. When the pressure difference between the two pressure detection ports cannot be established, the filter tube 15 may be perforated and needs to be replaced.

[0054] The housing 1 is also provided with a plurality of flushing ports 36, which are used to connect deionized water. The flushing ports 36 are also provided with flushing nozzles 37, and the flushing nozzles 37 are rotatably connected to the flushing ports 36. When the filter tube 15 is blocked and needs to be cleaned and maintained, deionized water can be introduced into the housing 1 through the flushing ports 36, and the filter tube 15 can be flushed through the flushing nozzles 37, so that the impurities on the filter tube 15 can be dissolved in the deionized water again. After a period of soaking, the soaking water is discharged from the drain port 38 at the bottom of the housing 1, thereby achieving the purpose of cleaning the filter tube 15 and extending the service life of the filter tube 15.

[0055] The above description is only a preferred embodiment of the utility model, and does not limit the patent protection scope of the utility model. Any equivalent structural transformation made using the contents of the utility model specification and drawings, directly or indirectly used in other related technical fields, is also included in the protection scope of the utility model.

Claims

1. A continuous waste heat recovery device for enhancing atomization, characterized in that: It comprises a shell, the shell is provided with a steam inlet and a steam outlet, the steam inlet is used to introduce superheated steam, the steam outlet is used to lead out clean steam, and an atomizing component and a centrifugal filtering component are arranged in the shell; The atomizing assembly comprises a water inlet pipe, a guide pipe, a guide nozzle and a plurality of guide plates. One end of the water inlet pipe is used to introduce continuous drainage, and the other end is arranged in the shell; the guide plate is arranged in the shell in a radial ring shape and is located at the steam inlet, and is rotatably connected to the water inlet pipe through a bearing, and the guide plate is a hollow plate, which is connected to the inside of the water inlet pipe, and a plurality of evenly distributed through holes are also provided on both sides of the guide plate; one end of the guide pipe is connected to the water inlet pipe, and the other end is connected to the guide nozzle; the guide nozzle is used to impact the continuous drainage in the water inlet pipe onto the guide plate; The centrifugal filter assembly is detachably mounted in the housing and is used for centrifugally filtering the vaporized mixed gas of the waste water and the superheated steam into clean steam.

2. The atomization-enhanced row waste heat recovery device according to claim 1, characterized in that: The atomization assembly also includes a connecting frame and a conical disperser fixed in the water inlet pipe through the connecting frame. The tip of the conical disperser is arranged in the opposite direction of the water flow direction, and a plurality of hemispherical protrusions are arranged on the surface of the conical disperser.

3. The atomization-enhanced continuous waste heat recovery device according to claim 1 or 2, characterized in that: The centrifugal filter assembly includes a fixed plate, a bearing, a spiral blade and a plurality of filter tubes; the fixed plate is used to connect the filter tube to the housing, and the fixed plate is sealed to the housing; the filter tube is rotatably connected to the fixed plate through the bearing, and the spiral blade is fixed to the inner wall of the filter tube; One end of the filter tube close to the steam inlet is an open end, and the other end is a closed end; the interior of the filter tube is connected to the steam inlet through the open end; the filter tube includes a ceramic layer, a polytetrafluoroethylene filter layer, a hollow fiber ultrafiltration layer, a NF nanofiltration layer and a unidirectional filter membrane layer in sequence along the steam filtration direction.

4. The atomization-enhanced series waste heat recovery device according to claim 3, characterized in that: The spiral blades are ceramic blades.

5. The atomization-enhanced series waste heat recovery device according to claim 4, characterized in that: The shell is also provided with an assembly port, through which the centrifugal filter assembly is installed in the shell; a sealing assembly is also provided between the assembly port and the shell, the sealing assembly includes an end cover, a sealing ring and an elastic fastener, a connecting flange is provided on the assembly port, the end cover and the connecting flange are connected by fastening bolts, the sealing ring is arranged between the end cover and the connecting flange, and the elastic fastener is used for secondary fastening of the end cover and the connecting flange.

6. The atomization-enhanced series waste heat recovery device according to claim 5, characterized in that: The elastic fastener includes a fastening block 1, a fastening block 2, a connecting block and a spring. The fastening block 1 and the fastening block 2 are respectively fixed at two ends of the connecting block. The fastening block 1 is fixedly connected to the connecting flange. One end of the spring is arranged on the inner side of the fastening block 2, and the other end is arranged on the end cover. The distance between the fastening block 2 and the end cover is less than the free length of the spring.

7. The atomization-enhanced series waste heat recovery device according to claim 6, characterized in that: The fastening bolt comprises a screw and a nut; a first thread and a second thread in opposite directions are arranged on the stud of the screw, the first thread matches with the internal thread on the end cover and the connecting flange, and the second thread matches with the nut.

Images