Boiler inlet water preheating device

Abstract

The boiler water inlet preheating device particularly relates to the technical field of boilers and comprises a heat exchange box, the left side of the heat exchange box is connected with a first heat exchange pipe and a second heat exchange pipe from top to bottom, and the right end of the first heat exchange pipe and the right end of the second heat exchange pipe are connected with a third heat exchange pipe; the left end of the first heat exchange pipe is connected with a first gas conveying pipe, one end of the first gas conveying pipe is provided with a purification mechanism, and the left end of the second heat exchange pipe is connected with an exhaust pipe. A turbulent flow mechanism is arranged in the heat exchange box and located between the first heat exchange pipe and the second heat exchange pipe, high-temperature flue gas can be conveniently guided into the cyclone dust collector by arranging the flue gas inlet pipe, the dust removal effect is achieved, meanwhile, a calcium oxide layer is arranged in the flue gas inlet pipe, calcium oxide makes contact with and reacts with sulfur dioxide, and therefore the dust removal effect is improved. Sulfur dioxide in the flue gas is converted into solid calcium sulfite or calcium sulfate, so that effective removal of sulfur dioxide is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of boilers, and particularly to a boiler feed water preheating device. Background Art

[0002] A boiler is a device that uses the heat energy released by fuel combustion or other heat energy to heat a working medium (usually water) to a certain parameter (temperature, pressure) and produce steam, hot water or other heat media of specified quality. It consists of two parts: a "boiler" and a "furnace". The "boiler" refers to the pressure-bearing components that accommodate water and steam, including a boiler drum, water-cooled walls, convective tube bundles, economizers, etc.; the "furnace" refers to the place where fuel is burned, including a furnace chamber, burners, air preheaters, etc. Among them, boiler feed water preheating refers to the process of heating and raising the temperature of water before introducing it into the boiler. After the preheated water enters the boiler, it can absorb heat more quickly and be converted into steam, reducing the heating time and energy consumption of the boiler and improving the thermal efficiency of the boiler.

[0003] In the current process of using a boiler feed water preheating device, the common method is to use the waste heat of the flue gas discharged from the boiler itself to heat the feed water. This method not only recovers the waste heat in the flue gas but also reduces the flue gas discharge temperature and improves the overall thermal efficiency of the boiler. However, the flue gas contains impurities such as dust and sulfur dioxide, which are likely to gradually accumulate on the inner wall of the heat conduction tube to form a fouling layer during the heat exchange process with the heat conduction tube, reducing the heat transfer efficiency of the heat conduction tube and thus affecting the preheating efficiency. Summary of the Invention

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A boiler feed water preheating device, comprising:

[0006] A heat exchange box, the top of the heat exchange box is connected with a water inlet pipe, the right side of the heat exchange box is connected with a drain pipe, the left side of the heat exchange box is connected with a first heat exchange tube and a second heat exchange tube from top to bottom, the right ends of the first heat exchange tube and the second heat exchange tube are connected with a third heat exchange tube, the left end of the first heat exchange tube is connected with a first gas transmission pipe, one end of the first gas transmission pipe is provided with a purification mechanism, and the left end of the second heat exchange tube is connected with an exhaust pipe;

[0007] A turbulence mechanism is arranged at the middle position inside the heat exchange box between the first heat exchange tube and the second heat exchange tube.

[0008] In a possible implementation, the purification mechanism includes a cyclone dust collector. A central pipe is connected to the top of the cyclone dust collector. The top end of the central pipe is fixedly connected to a first gas transmission pipe. A ash hopper is connected to the bottom of the cyclone dust collector. A flue gas inlet pipe is connected to the outside of the cyclone dust collector. A through hole is formed on one side of the flue gas inlet pipe. A calcium oxide layer is slidably connected inside the through hole. A side plate is connected to one side of the calcium oxide layer.

[0009] In a possible implementation, a sleeve is connected to the outside of the side plate. Insertion cylinders are connected to both the left and right sides of the through hole on one side of the flue gas inlet pipe. The positions of the insertion cylinders correspond to the position of the sleeve. A pair of sliding grooves are correspondingly formed on the front side of the sleeve. A sliding rod is slidably connected inside the sliding groove. A insertion rod is connected to one side of the sliding rod. One end of the insertion rod extends into the insertion cylinder. The other end of the insertion rod is connected to a return spring. One end of the return spring is connected to a spacer block. The outside of the spacer block is fixedly connected to the sleeve.

[0010] In a possible implementation, inner retaining strips and outer retaining strips are respectively connected to both the left and right sides of the inner wall of the flue gas inlet pipe at the position of the through hole.

[0011] In a possible implementation, the distance between the inner retaining strip and the outer retaining strip is the same as the width of the calcium oxide layer.

[0012] In a possible implementation, both the first heat exchange pipe and the second heat exchange pipe are arranged in a serpentine shape.

[0013] In a possible implementation, the flow disturbing mechanism includes a first shaft rod and a second shaft rod. Both ends of the first shaft rod and the second shaft rod are rotatably connected to both sides of the heat exchange box. A number of blades are circumferentially connected to the outside of the first shaft rod and the second shaft rod.

[0014] In a possible implementation, a servo motor is connected to the right end of the first shaft rod. The bottom of the servo motor is fixedly connected to the heat exchange box. A first pulley and a second pulley are respectively connected to the left ends of the first shaft rod and the second shaft rod. A belt is sleeved on the outside of the first pulley and the second pulley.

[0015] In a possible implementation, a pair of sealed bearings are embedded in both the front and back sides of the heat exchange box. The pair of sealed bearings are respectively rotatably connected to the first shaft rod and the second shaft rod.

[0016] In a possible implementation, a pair of sealed sleeves are respectively embedded in the right side of the heat exchange box from top to bottom. The pair of sealed sleeves are respectively fixedly connected to the first heat exchange pipe and the second heat exchange pipe.

[0017] In the above technical solution, the technical effects and advantages provided by the present invention:

[0018] 1. By setting up a flue gas inlet pipe, it is convenient to introduce high-temperature flue gas into the cyclone dust collector. The centrifugal force generated by the rotating airflow is used to separate dust particles from the high-temperature airflow. The dust is thrown towards the wall of the device under the action of centrifugal force and falls along the wall surface to the ash hopper. The purified high-temperature flue gas is discharged from the central pipe, achieving the dust removal effect. At the same time, a calcium oxide layer is arranged inside the flue gas inlet pipe. Sulfur dioxide is an acidic gas, and calcium oxide is a basic oxide, and the two will undergo an acid-base neutralization reaction. In the flue gas inlet pipe, calcium oxide contacts and reacts with sulfur dioxide, converting sulfur dioxide in the flue gas into solid calcium sulfite or calcium sulfate, thereby effectively removing sulfur dioxide and reducing the content of sulfur dioxide in the flue gas. Furthermore, it is beneficial to avoid the problem that a dirt layer gradually accumulates on the inner wall of the heat conduction pipe, which will reduce the heat transfer efficiency of the heat conduction pipe.

[0019] 2. By starting the servo motor, driving the first shaft to rotate, through the connection between the first pulley, the second pulley and the belt, it is convenient to drive the second shaft to rotate synchronously, driving the blades outside the two side shafts to rotate, enhancing the flow of water, making the water fully mixed, and uniforming the water temperature distribution, avoiding the situation of local overheating or overcooling, enabling the entire water body to more effectively absorb the heat transferred by the heat exchange pipe, accelerating the speed of heat transfer, and further improving the preheating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0021] Figure 1 is one of the overall structural schematic diagrams of the present invention;

[0022] Figure 2 is the second of the overall structural schematic diagrams of the present invention;

[0023] Figure 3 is one of the side sectional views of the heat exchange box of the present invention;

[0024] Figure 4 is the second of the side sectional views of the heat exchange box of the present invention;

[0025] Figure 5 is the structural schematic diagram of the first heat exchange pipe, the second heat exchange pipe and the third heat exchange pipe of the present invention;

[0026] Figure 6 is the internal structural explosion diagram of the flue gas inlet pipe of the present invention.

[0027] Description of the reference numerals:

[0028] 1. First gas pipeline; 2. Central pipe; 3. Cyclone dust collector; 4. Flue gas inlet pipe; 5. Ash hopper; 6. Exhaust pipe; 7. Servo motor; 8. Heat exchange box; 9. Water inlet pipe; 10. Drain pipe; 11. Belt; 12. First shaft rod; 13. First heat exchange pipe; 14. Second shaft rod; 15. Blade; 16. Second heat exchange pipe; 17. Third heat exchange pipe; 18. Sealed bearing; 19. First pulley; 20. Second pulley; 21. Sealing sleeve; 22. Inner retaining strip; 23. Insertion cylinder; 24. Outer retaining strip; 25. Through hole; 26. Calcium oxide layer; 27. Side plate; 28. Sleeve; 29. Chute; 30. Partition block; 31. Return spring; 32. Slide rod; 33. Insertion rod. Specific embodiments

[0029] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] The embodiments of the present application provide a boiler feed water preheating device to solve the problems in the prior art.

[0031] The technical solutions in the embodiments of the present application for solving the above problems are generally as follows:

[0032] As Figures 1-6 shown, a boiler feed water preheating device includes:

[0033] A heat exchange box 8, a water inlet pipe 9 is connected to the top of the heat exchange box 8, a drain pipe 10 is connected to the right side of the heat exchange box 8, a first heat exchange pipe 13 and a second heat exchange pipe 16 are respectively connected to the left side of the heat exchange box 8 from top to bottom, the right ends of the first heat exchange pipe 13 and the second heat exchange pipe 16 are connected to a third heat exchange pipe 17, the left end of the first heat exchange pipe 13 is connected to a first gas pipeline 1, a purification mechanism is provided at one end of the first gas pipeline 1, and the left end of the second heat exchange pipe 16 is connected to an exhaust pipe 6;

[0034] Inside the heat exchange box 8, a flow disturbing mechanism is arranged at the middle position between the first heat exchange tube 13 and the second heat exchange tube 16. Without the flow disturbing mechanism, the water near the heat exchange tube will be heated first. As time goes by, this part of the hot water will flow upward under the action of gravity, resulting in uneven water temperature distribution. The hot water accumulates at the top, while the water at the bottom cannot be fully heated. Such a temperature stratification phenomenon is not conducive to the overall heat transfer because the thermal resistance will increase with the increase of the temperature difference. By turning on the servo motor 7, the first shaft rod 12 is driven to rotate. Through the connection between the first pulley 19, the second pulley 20 and the belt 11, it is convenient to drive the second shaft rod 14 to rotate synchronously, drive the blades 15 on the outer sides of the two shaft rods to rotate, enhance the water flow, make the water fully mixed, even the water temperature distribution, avoid local overheating or overcooling, enable the whole water body to absorb the heat transferred by the heat exchange tube more effectively, speed up the heat transfer speed, and further improve the preheating effect.

[0035] In some examples, the purification mechanism includes a cyclone dust collector 3. The top of the cyclone dust collector 3 is connected with a central pipe 2. The top end of the central pipe 2 is fixedly connected with the first gas transmission pipe 1. The bottom of the cyclone dust collector 3 is connected with an ash hopper 5. The outside of the cyclone dust collector 3 is connected with a flue gas inlet pipe 4. A through hole 25 is opened on one side of the flue gas inlet pipe 4. An oxide calcium layer 26 is slidably connected inside the through hole 25. One side of the oxide calcium layer 26 is connected with a side plate 27. The high-temperature flue gas is introduced into the cyclone dust collector 3. The centrifugal force generated by the rotating airflow is used to separate the dust particles from the high-temperature airflow. The dust is thrown towards the wall of the device under the action of centrifugal force and falls along the wall surface to the ash hopper 5. The purified high-temperature flue gas is discharged from the central pipe 2 to achieve the dust removal effect. At the same time, an oxide calcium layer 26 is arranged inside the flue gas inlet pipe 4. Sulfur dioxide is an acidic gas, and calcium oxide is a basic oxide. The two will undergo an acid-base neutralization reaction. In the flue gas inlet pipe 4, calcium oxide contacts and reacts with sulfur dioxide to convert the sulfur dioxide in the flue gas into solid calcium sulfite or calcium sulfate, thereby effectively removing the sulfur dioxide in the flue gas and reducing the content of sulfur dioxide in the flue gas.

[0036] In some examples, a sleeve 28 is connected to the outer side of the side panel 27, and an insert 23 is connected to the left and right sides of the through hole 25 on one side of the smoke inlet pipe 4. The position of the insert 23 corresponds to the position of the sleeve 28, and a pair of slide grooves 29 are correspondingly opened on the front side of the sleeve 28. A sliding rod 32 is slidably connected to the inside of the slide groove 29, and a plug 33 is connected to one side of the sliding rod 32. One end of the plug 33 extends to the inside of the insert 23, and the other end of the plug 33 is connected to a return spring 31. One end of the return spring 31 is connected to a spacer 30, and the outer side of the spacer 30 is fixedly connected to the sleeve 28. When the calcium oxide layer 26 needs to be removed and replaced, the sliding rods 32 on both sides are pressed to move back to back, so that the plug 33 on both sides are driven to move back to back, so that the plug 33 is taken out from the inside of the plug 23, thereby facilitating the removal and replacement of the side panel 27 and the calcium oxide layer 26.

[0037] In some examples, the inner wall of the smoke inlet pipe 4 is located on the left and right sides of the through hole 25 and is respectively connected with an inner stop bar 22 and an outer stop bar 24 , which is beneficial to limit the position of the calcium oxide layer 26 .

[0038] In some examples, the distance between the inner stop bar 22 and the outer stop bar 24 is consistent with the width of the calcium oxide layer 26, so as to facilitate the positioning of the calcium oxide layer 26 and prevent it from being displaced.

[0039] In some examples, the first heat exchange tube 13 and the second heat exchange tube 16 are both configured in a serpentine shape.

[0040] In some examples, the spoiler mechanism includes a first shaft 12 and a second shaft 14, both ends of the first shaft 12 and the second shaft 14 are rotatably connected to the two sides of the heat exchange box 8, and the outer sides of the first shaft 12 and the second shaft 14 are circumferentially connected with a plurality of blades 15. When there is no spoiler mechanism, the water close to the heat exchange tube will be heated first. As time goes by, this part of the hot water will flow upward under the action of gravity, resulting in uneven water temperature distribution, hot water gathering at the top, and the water below cannot be fully heated. Such temperature stratification is not conducive to overall heat transfer, because thermal resistance will increase with the increase of temperature difference. The blades 15 fully mix the water, evenly distribute the water temperature, avoid local overheating or overcooling, and enable the entire water body to more effectively absorb the heat transferred by the heat exchange tube, thereby accelerating the speed of heat transfer.

[0041] In some examples, a servo motor 7 is connected to the right end of the first shaft 12. The bottom of the servo motor 7 is fixedly connected to the heat exchange box 8. The left ends of the first shaft 12 and the second shaft 14 are respectively connected with a first pulley 19 and a second pulley 20. A belt 11 is sleeved outside the first pulley 19 and the second pulley 20. When the servo motor 7 is started, the first shaft 12 is driven to rotate. Through the connection between the first pulley 19, the second pulley 20 and the belt 11, it is convenient to drive the second shaft 14 to rotate synchronously, drive the blades 15 outside the two shafts to rotate, and enhance the flow of water.

[0042] In some examples, a pair of sealed bearings 18 are embedded on the front and back sides of the heat exchange box 8. The pair of sealed bearings 18 are respectively rotationally connected to the first shaft 12 and the second shaft 14, which facilitates the rotational connection of the first shaft 12 and the second shaft 14.

[0043] In some examples, a pair of sealed sleeves 21 are respectively embedded from top to bottom on the right side of the heat exchange box 8. The pair of sealed sleeves 21 are respectively fixedly connected to the first heat exchange tube 13 and the second heat exchange tube 16, which is beneficial to increasing the sealing effect between the first heat exchange tube 13, the second heat exchange tube 16 and the heat exchange box 8.

[0044] In the present invention, by providing the flue gas inlet pipe 4, it is convenient to introduce high-temperature flue gas into the cyclone dust collector 3. The centrifugal force generated by the rotating airflow is used to separate dust particles from the high-temperature airflow. The dust is thrown towards the wall of the device under the action of centrifugal force and falls along the wall surface to the ash hopper 5. The purified high-temperature flue gas is discharged from the central pipe 2 to achieve the dust removal effect. At the same time, a calcium oxide layer 26 is provided inside the flue gas inlet pipe 4. Sulfur dioxide is an acidic gas, and calcium oxide is a basic oxide, and the two will undergo an acid-base neutralization reaction. In the flue gas inlet pipe 4, calcium oxide contacts and reacts with sulfur dioxide to convert sulfur dioxide in the flue gas into solid calcium sulfite or calcium sulfate, thereby effectively removing sulfur dioxide and reducing the content of sulfur dioxide in the flue gas. Furthermore, it is beneficial to avoid the gradual accumulation of a dirt layer on the inner wall of the heat conduction pipe. At the same time, by starting the servo motor 7, the first shaft 12 is driven to rotate. Through the connection between the first pulley 19, the second pulley 20 and the belt 11, it is convenient to drive the second shaft 14 to rotate synchronously, drive the blades 15 outside the two shafts to rotate, enhance the flow of water, make the water fully mixed, even the water temperature distribution, avoid local overheating or overcooling, enable the entire water body to more effectively absorb the heat transferred by the heat exchange tube, accelerate the heat transfer speed, and further improve the preheating effect.

[0045] Only some exemplary embodiments of the present invention have been described by way of illustration. Without doubt, for those of ordinary skill in the art, various different ways can be used to modify the described embodiments without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A boiler water preheating device, characterized in that: include: A heat exchange box (8), wherein the top of the heat exchange box (8) is connected to a water inlet pipe (9), the right side of the heat exchange box (8) is connected to a drain pipe (10), the left side of the heat exchange box (8) is respectively connected to a first heat exchange pipe (13) and a second heat exchange pipe (16) from top to bottom, the right ends of the first heat exchange pipe (13) and the second heat exchange pipe (16) are connected to a third heat exchange pipe (17), the left end of the first heat exchange pipe (13) is connected to a first gas transmission pipe (1), one end of the first gas transmission pipe (1) is provided with a purification mechanism, and the left end of the second heat exchange pipe (16) is connected to an exhaust pipe (6); A flow disturbance mechanism is provided inside the heat exchange box (8) at a position intermediate between the first heat exchange tube (13) and the second heat exchange tube (16).

2. A boiler inlet water preheating device according to claim 1, characterized in that: The purification mechanism comprises a cyclone dust collector (3), the top of the cyclone dust collector (3) is connected to a central tube (2), the top of the central tube (2) is fixedly connected to a first air supply pipe (1), the bottom of the cyclone dust collector (3) is connected to an ash hopper (5), the outer side of the cyclone dust collector (3) is connected to a flue gas inlet pipe (4), one side of the flue gas inlet pipe (4) is provided with a through hole (25), the interior of the through hole (25) is slidably connected to a calcium oxide layer (26), and one side of the calcium oxide layer (26) is connected to a side plate (27).

3. A boiler inlet water preheating device according to claim 2, characterized in that: The outer side of the side plate (27) is connected to a sleeve (28), and one side of the smoke inlet pipe (4) is connected to an insert sleeve (23) on both sides of the left and right sides of the through hole (25). The position of the insert sleeve (23) corresponds to the position of the sleeve (28). A pair of slide grooves (29) are correspondingly opened on the front side of the sleeve (28). The interior of the slide groove (29) is slidably connected to a slide rod (32). One side of the slide rod (32) is connected to an insert rod (33). One end of the insert rod (33) extends to the interior of the insert sleeve (23). The other end of the insert rod (33) is connected to a return spring (31). One end of the return spring (31) is connected to a spacer (30). The outer side of the spacer (30) is fixedly connected to the sleeve (28).

4. A boiler inlet water preheating device according to claim 2, characterized in that: The inner wall of the smoke inlet pipe (4) is located on the left and right sides of the through hole (25), and is respectively connected to an inner stop bar (22) and an outer stop bar (24).

5. A boiler inlet water preheating device according to claim 4, characterized in that: The distance between the inner barrier strip (22) and the outer barrier strip (24) is consistent with the width of the calcium oxide layer (26).

6. A boiler inlet water preheating device according to claim 1, characterized in that: The first heat exchange tube (13) and the second heat exchange tube (16) are both arranged in a serpentine shape.

7. A boiler inlet water preheating device according to claim 1, characterized in that: The spoiler mechanism comprises a first shaft (12) and a second shaft (14); both ends of the first shaft (12) and the second shaft (14) are rotatably connected to two sides of the heat exchange box (8); and a plurality of blades (15) are circumferentially connected to the outer sides of the first shaft (12) and the second shaft (14).

8. A boiler inlet water preheating device according to claim 7, characterized in that: The right end of the first shaft (12) is connected to a servo motor (7), the bottom of the servo motor (7) is fixedly connected to the heat exchange box (8), the left ends of the first shaft (12) and the second shaft (14) are respectively connected to a first pulley (19) and a second pulley (20), and the outer sides of the first pulley (19) and the second pulley (20) are provided with a belt (11).

9. A boiler inlet water preheating device according to claim 7, characterized in that: A pair of sealed bearings (18) are embedded in the front and rear sides of the heat exchange box (8), and the pair of sealed bearings (18) are rotatably connected to the first shaft (12) and the second shaft (14) respectively.

10. A boiler inlet water preheating device according to claim 1, characterized in that: A pair of sealing sleeves (21) are respectively embedded in the right side of the heat exchange box (8) from top to bottom, and the pair of sealing sleeves (21) are respectively fixedly connected to the first heat exchange tube (13) and the second heat exchange tube (16).

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