Boiler blow-down water heat recovery device

Abstract

The utility model relates to the technical field of boiler sewage treatment, and discloses a boiler blow-down water heat recovery device which comprises a shell, a water inlet and a water outlet are formed in the shell, a plurality of heat exchange pipes are arranged in the shell in parallel, and every two adjacent heat exchange pipes are connected in an end-to-end communication mode. A filter screen cylinder is arranged in each heat exchange tube, the head end of each filter screen cylinder is open, and during working, sewage enters the filter screen cylinders from the openings of the filter screen cylinders and is discharged from the side parts of the filter screen cylinders; a water inlet pipe and a water outlet pipe which are communicated with the heat exchange pipes at the head and the tail are respectively arranged on the shell; according to the heat recovery device, the heat recovery effect can be guaranteed, meanwhile, dirt in sewage can be filtered in time, damage to the inner wall of the pipeline due to dirt washing is reduced, meanwhile, the probability that the interior of the pipeline is blocked is reduced, and the convenience of cleaning the pipeline is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler sewage treatment, in particular to a boiler sewage heat recovery device. Background Art

[0002] In order to ensure that the boiler water quality meets the national standards during operation, the boiler blowdown method must be adopted. Continuous blowdown is to remove salt impurities in the boiler water. The amount of boiler blowdown is directly related to the quality of feed water. The greater the alkalinity and salt content of the feed water, the more blowdown the boiler needs. For small and medium-sized boilers, the sodium ion exchange method is generally used to prepare soft water. This method can only remove the hardness in the water, but cannot reduce the alkalinity and salt content. Groundwater is the main source of boiler water. In recent years, due to excessive exploitation, the water quality has deteriorated day by day. Its alkalinity is generally between 3.5 and 5.5 mgN / 1. According to GB1576-85 standards, the boiler blowdown rate is as high as 19% to 33%. From this point of view, a large amount of high-temperature boiler water is discharged in vain because it cannot be effectively recovered, and the resulting heat energy loss is considerable.

[0003] In the prior art, the heat utilization of boiler sewage is usually achieved by water-water heat exchange. The heat exchange operation is achieved by injecting new water flow into the pipe carrying sewage, and the water flow after heat exchange is transported to a designated location for utilization, thereby improving the utilization of the heat in the sewage. In order to fully utilize the heat in the sewage, a serpentine coil is usually used to extend the flow path of the sewage and increase the heat exchange time. However, sewage contains a lot of impurities. If it is directly passed into the coil, the dirt will not only scour and wear the inner wall of the coil, affecting its service life, but also easily accumulate on the inner wall of the coil, causing the coil to be blocked. In addition, the coil is curved, which makes the cleaning operation more difficult, greatly increases the work intensity, and increases production costs. Utility Model Content

[0004] The purpose of the utility model is to provide a boiler sewage heat recovery device, which can ensure the heat recovery effect while achieving timely filtration of dirt in the sewage, reduce the damage to the inner wall of the pipeline caused by the scouring of the dirt, and at the same time reduce the probability of blockage inside the pipeline, thereby improving the convenience of pipeline cleaning.

[0005] The utility model adopts the following technical solutions:

[0006] A boiler wastewater heat recovery device comprises a shell, the shell is provided with a water inlet and a water outlet, a plurality of heat exchange tubes are arranged inside the shell, the plurality of heat exchange tubes are arranged in parallel, and two adjacent heat exchange tubes are connected end to end; a filter screen cylinder is arranged in each of the heat exchange tubes, and the head end of the filter screen cylinder is open, and when working, the sewage enters from the open end of the filter screen cylinder and is discharged from the side of the filter screen cylinder; the shell is respectively provided with a water inlet pipe and a water outlet pipe which are connected to the head and tail of the heat exchange tubes.

[0007] Preferably, the water inlet is arranged on one side of the bottom of the shell, and the water outlet is arranged on one side of the top of the shell away from the water inlet.

[0008] Preferably, a rotating shaft is rotatably arranged inside the filter cylinder, and an internal cleaning brush is arranged on the rotating shaft.

[0009] Preferably, two drainage tubes are arranged in parallel on the upper and lower sides of the shell, and the heat exchange tube is arranged between the two drainage tubes; a plurality of partition plates are arranged in the drainage tube, each of the partition plates is provided with a diversion hole, and an adjustment sleeve is rotatably arranged in the space formed by each two partition plates, and the adjustment sleeve is provided with a through hole, and the two diversion holes can be connected or closed by adjusting the position state of the through hole and the corresponding diversion hole; the adjustment sleeve is connected to the rotating shaft.

[0010] Preferably, the drainage pipe located below is connected to the sewage bin arranged on the bottom plate of the shell, and a sewage hole connected to the sewage bin is arranged in the drainage pipe located below, and a sewage outlet matching the sewage hole is arranged at the bottom of the adjustment sleeve located below, and the sewage hole and the sewage outlet are in a misaligned state in an initial state; a drainage hole is arranged at the bottom of the filter mesh cylinder in an even position, and a sealing plate rotatably connected to the filter mesh cylinder is arranged on the adjustment sleeve, and a drainage outlet matching the drainage hole is opened on the sealing plate, and the drainage hole and the drainage outlet are in a misaligned state in an initial state; a mounting plate is arranged in the heat exchange tube, and a drainage groove is arranged on the mounting plate, and a drainage hole matching the drainage groove is arranged on the adjustment sleeve located at the bottom, and the drainage hole and the drainage groove are in a misaligned state in an initial state.

[0011] Preferably, the tops of the filter screen cylinders in odd-numbered positions are provided with sealing plates, the sealing plates are provided with cleaning holes, the bottoms of the adjustment sleeves at the top are provided with cleaning ports, and in an initial state, the cleaning ports and the cleaning holes are in a misaligned state.

[0012] Preferably, an external cleaning brush is arranged outside the adjustment sleeve, and both end surfaces of the external cleaning brush are in contact with the outer wall of the filter cylinder and the inner wall of the heat exchange tube respectively.

[0013] Preferably, a plurality of heat dissipation protrusions are evenly arranged on the outer wall of the heat exchange tube.

[0014] Preferably, a sewage pipe is provided at the bottom of the sewage bin, an adjusting pipe is rotatably provided inside the sewage pipe, an auxiliary discharge hole is provided at the bottom of the shell, a sealing gasket is provided after the top end of the adjusting pipe extends to the inside of the shell through the auxiliary discharge hole; a drainage groove is provided on the side wall of the adjusting pipe located in the sewage bin.

[0015] Preferably, the water inlet pipe and the drainage pipe located above are both connected to each other and provided with a cleaning pipe, and the cleaning pipe is provided with a valve.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the utility model can extend the travel of sewage in the shell and ensure sufficient heat exchange by arranging a plurality of heat exchange tubes in parallel inside the shell and connecting the adjacent heat exchange tubes end to end; by arranging a filter screen cylinder inside the heat exchange tube and passing sewage from the head end, i.e., the inlet section, the filter screen cylinder can be used to filter the sewage, and by trapping the dirt in the filter screen cylinder, the scouring and wear of the inner wall of the heat exchange tube caused by solid impurities in the dirt can be avoided, thereby ensuring its service life; at the same time, since the dirt is trapped in the filter screen cylinder, the convenience of subsequent cleaning is also improved; in addition, the setting of the filter screen cylinder can also increase the filtering efficiency by utilizing its length, thereby extending the time interval for cleaning the dirt, and the structure is simple and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application;

[0018] Figure 2 A cross-sectional view of an embodiment of the present application;

[0019] Figure 3 This is a cross-sectional view of a heat exchange tube according to an embodiment of the present application;

[0020] Figure 4 This is a schematic diagram of the structure of the odd-numbered filter screen cartridge of the embodiment of the present application;

[0021] Figure 5 This is a schematic diagram of the structure of the even-numbered filter screen cartridge of the embodiment of the present application;

[0022] Figure 6 This is a schematic diagram of the structure of the mounting plate according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the present invention in conjunction with the accompanying drawings and embodiments:

[0024] like Figures 1 to 6As shown, a boiler sewage heat recovery device described in the utility model comprises a shell 1, on which a water inlet 2 and a water outlet 3 are provided for input and output of heat exchange water flow, wherein the water inlet 2 is preferably arranged on one side of the bottom of the shell 1, and the water outlet 3 is arranged on the side of the top of the shell 1 away from the water inlet 2, so as to achieve full contact between the water flow and the heat and improve the heat exchange effect; a plurality of heat exchange tubes 4 are arranged inside the shell 1, and the plurality of heat exchange tubes 4 are arranged in parallel, and two adjacent heat exchange tubes 4 are connected end to end, so as to provide a winding flow path for the sewage, prolong the contact time of the sewage with the required heating water flow during the heat exchange process, and ensure the full utilization of its heat, and a plurality of heat dissipation protrusions 5 are evenly arranged on the outer wall of each heat exchange tube 4 to enhance the heat transfer effect; wherein each heat exchange tube 4 4 are all provided with filter screen cylinders 6, and the head ends of the filter screen cylinders 6 are all open, and the heat exchange tubes 4 are all provided with mounting plates 7, the filter screen cylinders 6 are detachably connected to the mounting plates 7, and the mounting plates 7 are provided with openings matching the openings of the head ends of the filter screen cylinders 6. When working, sewage enters from the opening of the filter screen cylinders 6 and is discharged from the side of the filter screen cylinders 6, so that the sewage is filtered and the dirt in the sewage is trapped in the filter screen cylinders 6, thereby avoiding the scouring of the inner wall of the heat exchange tubes 4 and extending the service life of the heat exchange tubes 4. At the same time, the dirt is trapped in the filter screen cylinders 6, so that the dirt is adsorbed on the inner wall of the filter screen cylinders 6, which is also convenient for subsequent centralized cleaning; the shell 1 is respectively provided with a water inlet pipe 25 and a water outlet pipe 27 which are connected to the head end and the tail end of the heat exchange tube 4 for the input and output of sewage.

[0025] Furthermore, a rotating shaft 8 is rotatably provided inside the filter screen cylinder 6, and an internal cleaning brush is provided on the rotating shaft 8. By controlling the rotation of the rotating shaft 8, the internal cleaning brush can be used to clean the inner wall of the filter screen cylinder 6, thereby preventing dirt from being adsorbed and accumulated on the filter screen cylinder 6 for a long time and affecting the filtering effect. Specifically, in this embodiment, two drainage tubes 9 are parallelly provided on the upper and lower sides of the interior of the shell 1, and the heat exchange tube 4 is detachably provided between the two drainage tubes 9; a plurality of groups of partition plates 10 are provided inside the drainage tube 9, and each heat exchange tube 4 is correspondingly located in the space formed by each group of two partition plates 10, and each partition plate 10 is provided with a diversion hole 11, and an adjustment sleeve 12 is rotatably provided in the space formed by each two partition plates 10, and the adjustment sleeve 12 is connected to the rotating shaft 8, and the top of the rotating shaft 8 passes through the drainage tube 9 and the top of the shell 1 in sequence above, and an operating handle can be provided thereon for easy rotation and adjustment, and it can also be adjusted by a sprocket chain and an electric The adjusting sleeve 12 is driven in cooperation with the machine, and the matching selection can be made according to actual needs; a through hole 13 is provided on the adjusting sleeve 12, and the size of the through hole 13 is preferably matched with the size of the diverter hole 11. By adjusting the position state of the through hole 13 and the corresponding diverter hole 11, the two diverter holes 11 can be connected or closed, that is, by rotating the adjusting sleeve 12, the diverter holes 11 in each drainage pipe 9 can be completely connected, and the diverter holes 11 on each group of two partition plates 10 can be in an open and closed state by rotating the adjusting sleeve 12, so as to ensure that the sewage can flow in a winding manner in a manner where the multiple heat exchange tubes 4 are connected end to end.

[0026] The drainage pipe 9 located below is connected to the sewage bin 14 set on the bottom plate of the shell 1. Specifically, a drainage pipe 15 is set at the position corresponding to each heat exchange tube 4, and the drainage pipe 15 is connected to the sewage bin 14. A sewage hole 16 connected to the sewage bin 14 is set in the drainage pipe 9 located below. The sewage hole 16 is located outside the axis of the drainage pipe 15 and is arranged symmetrically. The bottom of the adjustment sleeve 12 located below is a sealing setting, and a sewage outlet 17 matching the sewage hole 16 is set on it. In the initial state, the sewage hole 16 and the sewage outlet 17 are in a misaligned state to ensure that the sewage hole 16 is in a sealed state during heat exchange work, and to ensure that the sewage flows according to the set path of the heat exchange tube 4. When sewage needs to be discharged, the rotating shaft 8 is rotated to drive the adjustment sleeve 12 Rotate to achieve the overlap of the sewage discharge hole 16 and the sewage discharge port 17; since the water inlet pipe 25 is located at the bottom in this embodiment, the filter screen cylinders 6 in the even-numbered positions are in the opposite arrangement to the filter screen cylinders 6 in the odd-numbered positions, that is, the filter screen cylinders 6 in the odd-numbered positions are open at the bottom, and the filter screen cylinders 6 in the even-numbered positions are open at the top. In order to facilitate the subsequent discharge of cleaned and fallen dirt, this embodiment provides a drainage hole at the bottom of the filter screen cylinder 6 in the even-numbered positions, which is used to subsequently discharge the dirt cleaned out from the inside of the filter screen from the bottom of the filter screen cylinder 6 in the even-numbered positions, wherein the drainage hole is located outside the axis of the filter screen cylinder 6, and a sealing plate 18 rotatably connected to the filter screen cylinder 6 is provided on the adjusting sleeve 12 to seal the drainage hole, and a sealing plate 18 is provided on the sealing plate 18 to seal the drainage hole. The drainage hole matches the drainage port 19. In the initial state, the drainage hole and the drainage port 19 are in a misaligned state, ensuring that the drainage hole is in a sealed state during normal operation. When the filter screen cylinder 6 needs to be cleaned, the rotating shaft 8 drives the adjusting sleeve 12 to rotate, and the sealing plate 18 is rotated, so that the drainage port 19 and the drainage hole overlap, so that the cleaned dirt can fall smoothly into the drainage pipe 9 below. At this time, the drainage hole 16 and the drainage port 17 at the bottom of the adjusting sleeve 12 are also in a coincidence state, thereby enabling the dirt to fall smoothly into the drainage bin 14. In addition, the sealing plate 18 matches the inner diameter of the heat exchange tube 4. The adjusting sleeve 12 is provided with a hole 20 for the normal flow of filtered sewage at a position outside the drainage port 19, which is generally open at The sewage filtered by the even-numbered filter cylinder 6 above enters the drainage pipe 9 below through the hole 20 and flows normally; a mounting plate 7 is provided in the heat exchange tube 4, and the mounting plate 7 is located on the open side of the filter cylinder 6. A drainage groove 21 is provided on the mounting plate 7, and the drainage groove 21 is located at a position outside the filter cylinder 6. A drainage hole 22 matching the drainage groove 21 is provided on the adjustment sleeve 12. In the initial state, the drainage hole 22 and the drainage groove 21 are in a misaligned state to ensure that the drainage groove 21 is in a sealed state during normal operation. The sewage can only enter the filter cylinder 6 from the opening of the mounting plate 7. The setting of the drainage groove 21 is used to subsequently clean the dirt that has fallen from the outer wall of the filter cylinder 6 and the inner wall of the heat exchange tube 4 and discharge it into the drainage pipe 9 below.

[0027] The top of the filter screen cylinder 6 in the odd-numbered position is provided with a sealing plate 23, and a cleaning hole is provided on the sealing plate 23. The bottom of the adjustment sleeve 12 located at the top is provided with a cleaning port 24. In the initial state, the cleaning port 24 and the cleaning hole are in a misaligned state; to ensure the sealing state during operation; when the cleaning port 24 coincides with the cleaning hole, clean water can be injected into the drainage pipe 9 at the top, and the clean water enters through the cleaning port 24 and the cleaning hole to achieve flushing of the inner wall of the filter screen cylinder 6. Preferably, the water inlet pipe 25 and the drainage pipe 9 located at the top are both connected and provided with a cleaning pipe 26, and a valve is provided on the cleaning pipe 26, so that cleaning water can be introduced into the heat exchange tube 4 during regular cleaning operations. In addition, since the diameter of the adjustment sleeve 12 matches the space enclosed by the two partition plates 10, an overflow hole 28 is also provided on the adjustment sleeve 12 outside the cleaning port 24. The overflow hole 28 and the cleaning port 24 are located on circular rings with different axes, ensuring that the sewage filtered by the odd-numbered filter cylinders 6 is discharged into the drainage pipe 9 above through the overflow hole 28 during normal operation.

[0028] An external cleaning brush 29 is provided outside the adjusting sleeve 12, and both end surfaces of the external cleaning brush 29 are in contact with the outer wall of the filter screen cylinder 6 and the inner wall of the heat exchange tube 4. The external cleaning brush 29 can clean the outer wall of the filter screen cylinder 6 and the inner wall of the heat exchange tube 4, and when the rotating shaft 8 rotates, the inside and outside of the filter screen cylinder 6 and the inner wall of the heat exchange tube 4 are fully cleaned at the same time, thereby enhancing the practicality of the utility model.

[0029] Furthermore, a sewage pipe 30 is provided at the bottom of the sewage bin 14 for discharging sewage, and an adjusting pipe 31 is rotatably provided in the sewage pipe 30. An auxiliary discharge hole communicated with the interior of the sewage bin 14 is provided at the bottom of the shell 1. A sealing gasket 32 ​​is provided after the top of the adjusting pipe 31 extends to the interior of the shell 1 through the auxiliary discharge hole. In the initial state, the auxiliary discharge hole is sealed by the sealing gasket 32; a drainage groove 33 is provided on the side wall of the adjusting pipe 31 located in the sewage bin 14, and sewage discharged into the sewage bin 14 enters the sewage pipe 30 through the drainage groove 33 and is discharged from the sewage pipe 30; the setting of the adjusting pipe 31 can realize the extension of the adjusting pipe 31 to the interior of the shell 1 by rotating the adjusting pipe 31, so that the drainage groove 33 is located inside the shell 1, which helps to discharge the water flow that needs heat exchange inside the shell 1 from the drainage groove 33 on the side wall of the adjusting pipe 31 when it is less and inconvenient to be discharged from the water outlet 3, thereby enhancing the practicality of the utility model.

[0030] When the utility model is in use, the sewage is first passed into the filter screen cylinder 6 in the heat exchange tube 4 through the water inlet pipe 25, and at the same time, the heat exchange water flow is introduced from the water inlet 2 to contact the heat exchange tube 4 inside the shell 1 to achieve the heat exchange operation; the water flow after the heat exchange is discharged from the water outlet 3, and the sewage is discharged from the drain pipe; because the parallel heat exchange tubes 4 are connected end to end, the flow path of the sewage in the shell 1 can be extended, and the contact area between the water flow and the heat exchange tube 4 is increased to ensure the heat exchange effect and the full use of the heat in the sewage;

[0031] When it is necessary to clean the filter screen cylinder 6 and the inner wall of the heat exchange tube 4, the rotating shaft 8 can be rotated to drive the inner cleaning brush and the outer cleaning brush 29 to rotate, thereby realizing the cleaning operation of the dirt adhering to the filter screen cylinder 6 and the inner wall of the heat exchange tube 4; with the rotation of the rotating shaft 8, the adjusting sleeve 12 will also rotate synchronously, thereby realizing the overlap of the sewage hole 16 and the sewage outlet 17, the drainage hole and the drainage outlet 19, and the drainage groove 21 and the drainage hole 22. At this time, the cleaned dirt will smoothly enter the sewage bin 14 for subsequent centralized cleaning; finally, clean water can be introduced through the cleaning pipes on the water inlet pipe 25 and the water outlet pipe 27 to clean the inside of the filter screen cylinder 6.

Claims

1. A boiler wastewater heat recovery device, characterized in that: It comprises a shell, which is provided with a water inlet and a water outlet, and a plurality of heat exchange tubes are arranged inside the shell, the plurality of heat exchange tubes are arranged in parallel, and two adjacent heat exchange tubes are connected head to tail; a filter screen cylinder is arranged in each heat exchange tube, and the head end of the filter screen cylinder is open, and when working, the sewage enters from the open end of the filter screen cylinder and is discharged from the side of the filter screen cylinder; the shell is respectively provided with a water inlet pipe and a water outlet pipe which are connected with the head and tail of the heat exchange tubes.

2. The boiler wastewater heat recovery device according to claim 1, characterized in that: The water inlet is arranged on one side of the bottom of the shell, and the water outlet is arranged on one side of the top of the shell away from the water inlet.

3. The boiler wastewater heat recovery device according to claim 1, characterized in that: A rotating shaft is rotatably arranged inside the filter cylinder, and an internal cleaning brush is arranged on the rotating shaft.

4. The boiler wastewater heat recovery device according to claim 3 is characterized in that: Two drainage tubes are arranged in parallel on the upper and lower sides of the shell, and the heat exchange tube is arranged between the two drainage tubes; multiple groups of partition plates are arranged in the drainage tube, each of the partition plates is provided with a diversion hole, and an adjustment sleeve is rotatably arranged in the space formed by each two partition plates, and the adjustment sleeve is provided with a through hole, and the two diversion holes can be connected or closed by adjusting the position state of the through hole and the corresponding diversion hole; the adjustment sleeve is connected to the rotating shaft.

5. The boiler wastewater heat recovery device according to claim 4, characterized in that: The drainage pipe located below is connected to the sewage bin arranged on the bottom plate of the shell, and a sewage hole connected to the sewage bin is arranged in the drainage pipe located below, and a sewage outlet matching the sewage hole is arranged at the bottom of the adjustment sleeve located below, and the sewage hole and the sewage outlet are in a misaligned state in an initial state; a drainage hole is arranged at the bottom of the filter mesh cylinder in an even position, and a sealing plate rotatably connected to the filter mesh cylinder is arranged on the adjustment sleeve, and a drainage outlet matching the drainage hole is opened on the sealing plate, and the drainage hole and the drainage outlet are in a misaligned state in an initial state; a mounting plate is arranged in the heat exchange tube, and a drainage groove is arranged on the mounting plate, and a drainage hole matching the drainage groove is arranged on the adjustment sleeve located at the bottom, and the drainage hole and the drainage groove are in a misaligned state in an initial state.

6. The boiler wastewater heat recovery device according to claim 5, characterized in that: The top of the filter screen cylinder in the odd-numbered position is provided with a sealing plate, and the sealing plate is provided with a cleaning hole. The bottom of the adjustment sleeve located at the top is provided with a cleaning port. In the initial state, the cleaning port and the cleaning hole are in a misaligned state.

7. The boiler wastewater heat recovery device according to claim 6, characterized in that: An external cleaning brush is arranged outside the regulating sleeve, and both end surfaces of the external cleaning brush are in contact with the outer wall of the filter screen cylinder and the inner wall of the heat exchange tube respectively.

8. The boiler wastewater heat recovery device according to claim 1, characterized in that: The outer wall of the heat exchange tube is evenly provided with a plurality of heat dissipation protrusions.

9. The boiler wastewater heat recovery device according to claim 5, characterized in that: A sewage pipe is arranged at the bottom of the sewage bin, an adjusting pipe is rotatably arranged inside the sewage pipe, an auxiliary discharge hole is arranged at the bottom of the shell, a sealing gasket is arranged after the top end of the adjusting pipe extends to the inside of the shell through the auxiliary discharge hole; a drainage groove is opened on the side wall of the adjusting pipe located in the sewage bin.

10. The boiler wastewater heat recovery device according to claim 6, characterized in that: The water inlet pipe and the drainage pipe located above are both connected to a cleaning pipe, and a valve is arranged on the cleaning pipe.

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