Boiler pre-evaporator

Abstract

The utility model provides a boiler pre-evaporator which comprises an air inlet fan, a steam pipe and a drain pipe and further comprises a first heat exchange piece, the first heat exchange piece comprises a shell, a plurality of heat exchange pipes are arranged in the middle of the shell, the upper end and the lower end of each heat exchange pipe are provided with a heat exchange inlet and a heat exchange outlet respectively, and a flow guide plate is further arranged in the shell. An air inlet and an air outlet are formed in the left side and the right side of the shell correspondingly, the steam pipe is used for conveying steam into the first heat exchange part, and the drain pipe is used for draining condensate water. By arranging the guide plates and forming the S-shaped heat exchange flow channel, the staying time of air in the shell is prolonged, the heat exchange time is prolonged, and the heat exchange efficiency is improved. Therefore, heat transfer efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a preheater, in particular to a boiler steam preheater. Background Art

[0002] At present, the Chinese patent with the announcement number CN204201932U discloses a biomass boiler air preheater, which includes a smoke box body, a smoke pipe is arranged in the smoke box body, a heat exchange inlet and a heat exchange outlet are arranged above and below the box body, and a smoke guide box, a smoke inlet and a smoke outlet are also provided at the side end of the smoke box body, so as to exchange the heat in the smoke pipe to the air in the smoke guide box.

[0003] The above patent still has shortcomings. When performing heat exchange on steam, a large amount of condensed water will be generated in the above patent, and the condensed water usually needs to be recycled to reduce costs. Although a certain amount of heat exchange can be performed only through the above structure, the residence time of steam in the smoke guide box is short, which will lead to poor heat exchange effect, thereby causing the steam temperature to drop too slowly, less condensed water in the product, and a low recovery rate. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a boiler preheater, which has the advantage of efficient heat transfer.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a boiler preheater, including an air intake fan, a steam pipe and a drain pipe, and also including a heat exchange component. The heat exchange component includes a shell, and a plurality of heat exchange pipes are arranged in the middle of the shell. The upper and lower ends of the heat exchange pipes are respectively provided with a heat exchange inlet and a heat exchange outlet. A guide plate is also provided in the shell, and the guide plate and the shell form an S-shaped heat exchange flow channel. The left and right sides of the shell are respectively provided with an air inlet and an air outlet. The steam pipe is used to transport steam into the heat exchange component, and the drain pipe is used to discharge condensed water.

[0006] By means of the above technical means, by setting a guide plate and forming an S-shaped heat exchange flow channel, the time that the air stays in the shell is increased, the heat exchange time is increased, and thus the heat transfer efficiency is increased.

[0007] Preferably, it also includes a heat exchange component 2, and the heat exchange component 1 and the heat exchange component 2 have the same structure and are symmetrically arranged. A connecting air pipe and a transition pipe are also provided between the heat exchange component 1 and the heat exchange component 2. The air intake fan is connected to the air inlet of the heat exchange component 2, and the air outlet of the heat exchange component 2 is connected to the air inlet of the heat exchange component 1 through the connecting air pipe. The steam pipe is connected to the heat exchange inlet of the heat exchange component 1, and the heat exchange outlet of the heat exchange component 1 is connected to the heat exchange inlet of the heat exchange component 2 through the transition pipe. A water pump is provided in the transition pipe, and the water pump is used to input condensed water into the S-shaped heat exchange flow channel of the heat exchange component 2.

[0008] Through the above technical means, by setting up the second heat exchange element, connecting the air pipe and the transition pipe, and pressing the condensed water into the second heat exchange element through the water pump, the heat of the water body is further utilized to heat the air that needs to enter the boiler, thereby further increasing the heat transfer efficiency.

[0009] Preferably, a pressure relief pipe is further provided at the upper end of the drain pipe, the steam pipe is provided at the heat exchange inlet of the first heat exchange element, and the drain pipe and the pressure relief pipe are provided at the heat exchange outlet of the second heat exchange element.

[0010] Through the above technical means, by setting a pressure relief valve, it is possible to prevent the accumulation of excessive non-condensable gas in the heat exchange element 2, and at the same time facilitate the discharge of gas when the equipment is inspected and repaired.

[0011] Preferably, a hydrophobic filter is further provided in the transition pipe, a sampling tube is further provided at the bottom of the transition pipe, and a hydrophobic sampling valve is provided in the sampling tube.

[0012] Through the above technical means, a hydrophobic filter is set up to filter the condensed water, which makes it convenient to recycle and reuse the water. A sampling tube is set up to facilitate sampling of the condensed water after filtration.

[0013] Preferably, a cleaning component is further included, the cleaning component includes a flushing pipe arranged above the steam pipe and the pressure relief pipe, valve 1 is provided on the steam pipe and the drain pipe, and valve 2 is provided in the flushing pipe.

[0014] Through the above technical means, by closing valve one and the drain sampling valve and opening valve two, the rust removal liquid can be introduced to soak and remove rust on the heat exchange tube, thereby removing the rust and scale generated in the heat exchange tube. Finally, the drain sampling valve is opened to discharge the wastewater from the drain sampling valve.

[0015] Preferably, a rotating base is further provided at the bottom of the transition pipe, the transition pipe is fixed to the heat exchange component 1 and the heat exchange component 2 by screws, the sampling tube is rotatably provided on the rotating base, and a trench pipe connected to the sampling tube is opened in the rotating base.

[0016] By means of the above technical means, a rotating base is provided, thereby facilitating the disassembly and installation of the transition tube, and at the same time exposing the heat exchange tube, making it easier to observe the internal conditions of the heat exchange tube.

[0017] Preferably, a plurality of guide protrusions are provided in the shell, the heat exchange tubes are arranged in the guide protrusions and fixed by welding, and the guide plates are provided with through holes for the heat exchange tubes to pass through.

[0018] By means of the above technical means, the fixing accuracy of the heat exchange tube is increased by the guide convex ring, and welding thereof is facilitated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of an embodiment;

[0020] Figure 2 is a schematic cross-sectional view of an embodiment;

[0021] Figure 3 Schematic diagram of the structure of heat exchange element 1;

[0022] Figure 4 is a cross-sectional schematic diagram of a heat exchange element 1;

[0023] Figure 5 for Figure 4 Schematic diagram of part A.

[0024] Figure markings: 1. Intake fan; 2. Steam pipe; 3. Heat exchange component 1; 4. Heat exchange component 2; 5. Shell; 6. Heat exchange tube; 7. Heat exchange inlet; 8. Heat exchange outlet; 9. Guide plate; 10. Air inlet; 11. Air outlet; 12. Guide convex ring; 13. Insulation box; 14. Connecting air pipe; 15. Transition pipe; 16. Drain pipe; 17. Pressure relief pipe; 18. Sampling pipe; 19. Drain sampling valve; 21. Cleaning assembly; 24. Flushing pipeline; 25. Valve 1; 26. Valve 2; 27. Rotating base; 28. Trench pipe; 29. ​​S-shaped heat exchange channel; 31. Water pump; 32. Drain filter. DETAILED DESCRIPTION

[0025] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0026] A boiler preheater includes an air intake fan 1, a steam pipe 2 and a drain pipe 16. The steam pipe 2 is used to transport steam to a heat exchange element 2 4, and the drain pipe 16 is used to discharge condensed water. It also includes a heat exchange element 1 3 and a heat exchange element 2 4. The heat exchange element 1 3 and the heat exchange element 2 4 have the same structure and are symmetrically arranged. The heat exchange element 1 3 includes a shell 5. A plurality of heat exchange tubes 6 for steam to pass through are arranged in the middle of the shell 5. The upper and lower ends of the heat exchange tubes 6 are respectively a heat exchange inlet 7 and a heat exchange outlet 8. A guide plate 9 is also provided in the shell 5. The guide plate 9 is welded and fixed to the shell 5 and forms an S-shaped heat exchange flow channel 29 in the shell 5. The guide plate 9 forms an air inlet 10 and an air outlet 11 on the upper left and lower right sides of the shell 5 respectively. A plurality of guide protrusions 12 are provided on the upper side of the shell 5. The heat exchange tubes 6 are arranged in the guide protrusions 12 and fixed by welding. Through holes for the heat exchange tubes 6 to pass through are opened on the guide plates 9. The fixing accuracy of the heat exchange tubes 6 is increased by the guide protrusions 12.

[0027] The outside of heat exchange element 1 3 and heat exchange element 2 4 is wrapped with an insulation box 13 to reduce heat loss. A connecting air pipe 14 and a transition pipe 15 are also provided between heat exchange element 1 3 and heat exchange element 2 4. The air intake fan 1 is connected to the air inlet 10 of heat exchange element 2 4 and presses air into the air inlet 10. The air outlet 11 of heat exchange element 2 4 is connected to the air inlet 10 of heat exchange element 1 3 through the connecting air pipe 14. The steam pipe 2 is connected to the heat exchange inlet 7 of heat exchange element 1 3. The heat exchange outlet 8 of heat exchange element 1 3 is connected to the heat exchange inlet 7 of heat exchange element 2 4 through the transition pipe 15.

[0028] A water pump 31 is provided in the transition pipe 15, and the water pump 31 inputs the condensed water into the S-shaped heat exchange channel 29 of the heat exchange element 2 4, thereby further utilizing the heat of the water to heat the air that needs to enter the boiler, further increasing the heat transfer efficiency.

[0029] A pressure relief pipe 17 is also provided above the drain pipe 16. The steam pipe 2 is provided at the heat exchange inlet 7 of the heat exchange element 3. The drain pipe 16 and the pressure relief pipe 17 are provided at the heat exchange outlet 8 of the heat exchange element 2 4. When the steam enters the heat exchange tube 6 of the heat exchange element 3 from the steam pipe 2, the temperature of the steam is the highest. The outside of the heat exchange tube 6 here is the air outlet 11 of the heat exchange element 3. When the steam is discharged from the heat exchange outlet 8 of the heat exchange element 2 4, the temperature is relatively low. The outside of the heat exchange tube 6 here is the air inlet 10 of the heat exchange element 2 4. Therefore, in the entire air pipeline, the time when the air starts to heat up is proportional to the temperature of the heat exchange tube 6 in contact with it and gradually increases, thereby ensuring the heat transfer efficiency.

[0030] The heat exchange inlet 7 of the heat exchange element 2 4 and the heat exchange outlet 8 of the heat exchange element 1 3 are both facing downward. A sampling tube 18 is provided at the bottom of the transition pipe 15. A hydrophobic sampling valve 19 is provided in the sampling tube 18. By providing a hydrophobic filter 32, the condensed water is filtered to facilitate the recycling and reuse of the water body. By providing the sampling tube 18, it is convenient to sample the condensed water after the filtration is completed.

[0031] The steam pipe 2 is also provided with a cleaning component 21, which includes a flushing pipe 24 arranged above the steam pipe 2 and the pressure relief pipe 17. Valve 1 25 is provided on the steam pipe 2 and the drain pipe 16. Two valves 26 are provided in the flushing pipe 24. By closing valve 1 25 and the drain sampling valve 19 and opening valve 2 26, chemical rust removers, stain removers, etc. can be added to soak the heat exchange tube 6 for rust and stain removal. After completion, the drain sampling valve 19 is reopened to flush the wastewater out of the sampling pipe 18.

[0032] A rotating base 27 is also provided at the bottom of the transition pipe 15. The transition pipe 15 is fixed to the heat exchange element 24 and the heat exchange element 24 by screws. The sampling tube 18 is rotatably set on the rotating base 27. A trench pipe 28 connected to the sampling tube 18 is opened in the rotating base 27. The transition pipe 15 can be removed by opening a window hinged on the outside of the insulation box 13. After rotating the transition pipe 15, the bottom of the heat exchange tube 6 is exposed, which facilitates observation and sampling of the situation inside the heat exchange tube 6 and corresponding cleaning.

[0033] Of course, the above are only typical examples of the present invention. In addition, the present invention may have many other specific implementation methods. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the present invention.

Claims

1. A boiler preheater, characterized by: The invention comprises an air intake fan (1), a steam pipe (2) and a drain pipe (16), and also comprises a heat exchange component (3). The heat exchange component (3) comprises a shell (5), a plurality of heat exchange pipes (6) are arranged in the middle of the shell (5), and a heat exchange inlet (7) and a heat exchange outlet (8) are respectively arranged at the upper and lower ends of the heat exchange pipes (6). A guide plate (9) is also arranged in the shell (5), and the guide plate (9) and the shell (5) form an S-shaped heat exchange flow channel (29). The left and right sides of the shell (5) are respectively provided with an air inlet (10) and an air outlet (11). The steam pipe (2) is used to transport steam into the heat exchange component (3), and the drain pipe (16) is used to discharge condensed water.

2. A boiler preheater according to claim 1, characterized in that: The invention also includes a heat exchange component 2 (4). The heat exchange component 1 (3) and the heat exchange component 2 (4) have the same structure and are symmetrically arranged. A connecting air pipe (14) and a transition pipe (15) are also arranged between the heat exchange component 1 (3) and the heat exchange component 2 (4). The air intake fan (1) is connected to the air inlet (10) of the heat exchange component 2 (4). The air outlet (11) of the heat exchange component 2 (4) is connected to the air inlet (10) of the heat exchange component 1 (3) through the connecting air pipe (14). The steam pipe (2) is connected to the heat exchange inlet (7) of the heat exchange component 1 (3). The heat exchange outlet (8) of the heat exchange component 1 (3) is connected to the heat exchange inlet (7) of the heat exchange component 2 (4) through the transition pipe (15). A water pump (31) is arranged in the transition pipe (15). The water pump (31) is used to input condensed water into the S-shaped heat exchange flow channel (29) of the heat exchange component 2 (4).

3. A boiler preheater according to claim 2, characterized in that: A pressure relief pipe (17) is also provided at the upper end of the drain pipe (16), the steam pipe (2) is provided at the heat exchange inlet (7) of the first heat exchange element (3), and the drain pipe (16) and the pressure relief pipe (17) are provided at the heat exchange outlet (8) of the second heat exchange element (4).

4. A boiler preheater according to claim 3, characterized in that: A hydrophobic filter (32) is also provided in the transition pipe (15), a sampling pipe (18) is also provided at the bottom of the transition pipe (15), and a hydrophobic sampling valve (19) is provided in the sampling pipe (18).

5. A boiler preheater according to claim 4, characterized in that: The invention also includes a cleaning component (21), wherein the cleaning component (21) includes a flushing pipe (24) arranged above the steam pipe (2) and the drain pipe (16), a valve 1 (25) is arranged on the steam pipe (2) and the pressure relief pipe (17), and a valve 2 (26) is arranged in the flushing pipe (24).

6. A boiler preheater according to claim 4, characterized in that: A rotating base (27) is also provided at the bottom of the transition pipe (15), and the transition pipe (15) and the heat exchange element 2 (4) and the heat exchange element 2 (4) are fixed by screws. The sampling tube (18) is rotatably provided on the rotating base (27), and a trench pipe (28) communicating with the sampling tube (18) is provided in the rotating base (27).

7. The boiler preheater according to claim 1, characterized in that: A plurality of guide convex rings (12) are provided in the shell (5), the heat exchange tube (6) is provided in the guide convex ring (12) and fixed by welding, and the guide plate (9) is provided with a through hole for the heat exchange tube (6) to pass through.

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