A boiler with automatic cleaning of heating surface

Abstract

The present invention provides a boiler with automatic cleaning of heating surface, which belongs to the field of heat utilization technology. It includes a water tank, an exhaust gas inlet pipe, an exhaust gas outlet pipe, a steam outlet pipe, a water inlet pipe and a heating inner tank. The heating inner tank is cylindrical with a spiral guide groove. The exhaust gas inlet pipe is connected to the lower end of the heating inner tank, the exhaust gas outlet pipe is connected to the upper end of the heating inner tank, and a rotating frame is connected to the outside of the heating inner tank for rotation. The inner side of the radial plate is fixedly provided with a permanent magnetic strip located in the water tank, and a receiving hopper is fixedly provided at the bottom of the heating inner tank. The end of the guide pipe is connected with the lower end of the spiral guide groove. A filter screen with a conical cylindrical structure is connected between the outer edge of the large diameter end of the receiving hopper and the inner wall of the heating inner tank. The receiving hopper is located above the exhaust gas inlet pipe; the cross section of the spiral guide groove is a semicircular curved surface, and a plurality of steel balls with a diameter smaller than the diameter of the spiral guide groove are built into the receiving hopper. The present invention has the advantages of being able to clean the scale on the heating surface of the boiler online.

Description

Technical Field

[0001] The invention belongs to the technical field of heat utilization and relates to a boiler with automatic cleaning of the heating surface. Background Art

[0002] A boiler is an energy conversion device. The energy input into the boiler is in the form of chemical energy in the fuel, electrical energy, thermal energy of high-temperature flue gas, etc. After conversion by the boiler, it outputs steam, high-temperature water or organic heat carrier with a certain amount of thermal energy.

[0003] There are various types of boilers that recycle waste gas in industry. Although the waste heat in the waste gas is effectively utilized, the scaling of the boiler heating surface caused by dust and other substances contained in the waste gas is a criticism of the waste gas boiler. There are many existing methods for descaling the boiler heating surface, such as ultrasonic dust removal type mineral heating furnace waste heat boiler, compressed air or high-pressure steam purge dust removal mineral heating furnace waste heat boiler: blasting shock wave dust removal mineral heating furnace waste heat boiler, mechanical vibration dust removal mineral heating furnace waste heat boiler, etc. The dust removal methods are all active, and the cost is high, and the damage to the boiler heating surface is large, which is not ideal in practical applications.

[0004] A Chinese patent with patent number CN200910154109.X discloses a steel ball dust removal type submerged arc furnace waste heat boiler, which realizes the purpose of automatic dust removal of the submerged arc furnace waste heat boiler through steel ball circulation transportation, automatic unloading, automatic tipping over of steel balls, automatic spreading, and automatic cleaning of steel balls. It has a complex structure, drives the steel balls to circulate inside and outside, and requires the heating surface of the boiler to be flat, otherwise it is difficult to clean. As is known to all, the area of ​​the heating surface of the boiler directly affects the heat utilization efficiency. Furthermore, the circulation and heat exchange efficiency of water in the boiler are low. Summary of the invention

[0005] The purpose of the present invention is to provide a boiler with automatic heating surface cleaning in view of the above problems existing in the prior art. The technical problem to be solved by the present invention is how to enable the boiler to have the function of online cleaning of scale on the heating surface.

[0006] The purpose of the present invention can be achieved through the following technical solutions: a boiler with automatic cleaning of the heating surface, characterized in that it includes a water tank, an exhaust gas inlet pipe, an exhaust gas outlet pipe, a steam outlet pipe, a water inlet pipe and a heating inner tank, the steam outlet pipe is connected to the top of the water tank, the water inlet pipe is connected to the bottom of the water tank, the heating inner tank is cylindrical with a spiral guide groove, the exhaust gas inlet pipe is connected to the lower end of the heating inner tank, the exhaust gas outlet pipe is connected to the upper end of the heating inner tank, a rotating frame is rotatably connected to the outside of the heating inner tank, the rotating frame includes a plurality of spokes evenly distributed on the outside of the heating inner tank in the circumferential direction, the inner side of the spoke is fixedly provided with a permanent magnetic strip located in the water tank, and the bottom of the heating inner tank is fixedly provided with a A receiving hopper is provided, the lower end of which gradually contracts to form a material guide pipe, the material guide pipe is connected to the inner wall of the heated inner tank, the end of the material guide pipe is connected to the lower end of the spiral guide groove, the upper end of the spiral guide groove is smoothly transitioned to the inner wall of the heated inner tank, a filter screen with a conical cylindrical structure is connected between the outer edge of the large diameter end of the receiving hopper and the inner wall of the heated inner tank, the receiving hopper is located above the exhaust gas intake pipe; the cross-section of the spiral guide groove is a semicircular curved surface, a number of steel balls with a diameter smaller than that of the spiral guide groove are built into the receiving hopper, the heated inner tank and the receiving hopper are both made of high temperature resistant polymer materials; the permanent magnet strip can cover the entire peripheral wall of the heated inner tank where the spiral guide groove is located.

[0007] Furthermore, the exhaust gas inlet pipe and the exhaust gas outlet pipe are both rotatably connected to a shaft sleeve, and the rotating frame is fixed between the two shaft sleeves.

[0008] Furthermore, a first pulley is fixedly provided on the shaft sleeve on the exhaust gas outlet pipe, a reduction motor is provided on the inner wall of the water tank, a second pulley is fixedly provided on the output shaft of the reduction motor, and a belt is connected between the first pulley and the second pulley.

[0009] Furthermore, the lower end of the heated inner tank is connected to the exhaust gas inlet pipe via a conical transition pipe 1, the upper end of the heated inner tank is connected to the exhaust gas outlet pipe via a conical transition pipe 2, the radial plate has an inclined guide portion 1 at one transition pipe location, and the radial plate has an inclined guide portion 2 at a second transition pipe location.

[0010] Furthermore, the guide portion 1 is located above the water surface of the water tank.

[0011] Furthermore, a flow limiting valve is provided on the exhaust gas outlet pipe.

[0012] Furthermore, the heating liner and the receiving hopper may be made of polyphenylene or polyarylate.

[0013] The waste gas for waste heat utilization enters the heating inner tank through the waste gas inlet pipe, and is guided by the receiving hopper and the transition pipe. The waste gas passes through the filter along the inner wall of the heating inner tank and enters the area with the spiral guide groove, thereby enhancing the contact between the waste gas and the inner wall of the heating inner tank, and utilizing the high temperature difference between the waste gas and water to achieve rapid exchange of heat energy, thereby avoiding the waste of heat energy caused by the waste gas being discharged directly through the middle of the heating inner tank. Furthermore, after the waste gas enters the heating inner tank, it is affected by the spiral guide groove, which extends the rising path of the waste gas, thereby making fuller use of the heat. The circumference of the heating inner tank is cylindrical with a spiral guide groove, which can increase the heating area of ​​the heating inner tank. In addition, the heating inner tank has a larger diameter, which can greatly increase the heating surface area of ​​the heating inner tank.

[0014] The waste heat is discharged from the exhaust gas outlet pipe, and the reduction motor drives the rotating frame to rotate, so that the spoke plate rotates slowly outside the heated inner tank. Of course, the reduction motor can be normally open or turned on as needed. The rotation of the rotating frame can make the permanent magnetic strip on the spoke plate lift the steel ball along the spiral guide groove. After lifting to the top end of the spiral guide groove, the steel ball is no longer supported and cannot continue to stay on the inner wall of the heated inner tank only by the adsorption of the permanent magnetic strip. The steel ball slides from the inner wall of the heated inner tank to the filter screen in the receiving hopper or the outer periphery of the receiving hopper. On the upper side, under the guidance of the filter screen and the heated inner pot, the steel balls enter the guide pipe. Since the guide pipe smoothly transitions to the lower end opening of the spiral guide groove, the steel balls can be adsorbed by the permanent magnetic strip and then circulate in the spiral guide groove from bottom to top again, thereby circulating. During the upward movement, the steel balls rub against the inner wall of the spiral guide groove to clean the scale in the spiral guide groove. During the downward movement, the steel balls can also clean the raised parts between adjacent spiral guide groove circles to a certain extent, thereby the heated surface of the heated inner pot can be cleaned online.

[0015] In fact, the spiral guide groove part in the heating surface of the heated inner tank is easy to accumulate scale due to its concave shape, while the convex part is not easy to accumulate scale due to the action of airflow. Therefore, the movement of the steel ball in the spiral guide groove during its upward movement can better clean the heated inner tank.

[0016] The existence of the filter, on the one hand, does not affect the exhaust gas entering the heated inner tank, and on the other hand, it can receive and guide the falling steel balls to enter the receiving hopper.

[0017] In this solution, the heated inner tank has a large heating area, and the permanent magnetic strip is located in the water tank, the temperature of which will not be too high because water has a constant boiling point, and will not seriously affect the magnetism of the permanent magnetic strip.

[0018] The guide part 2 at the lower end of the auxiliary plate can stir the water in the water tank to a certain extent, so that the water in the water tank can convect better and accelerate the generation of steam. The guide part 1 at the upper end of the spoke plate can stir and drive away the steam above the water surface better, so that the water vapor concentration above the water surface is not too high, thereby improving the efficiency of water vapor generation by the water surface.

[0019] By adjusting the pressure limiting valve, the exhaust gas outlet pressure can be adjusted, thereby adjusting the circulation pressure and flow rate of the exhaust gas in the heated inner tank, so that the scale in the heated inner tank can be discharged through high-pressure exhaust gas when necessary, and the peeled scale in the heated inner tank can be discharged by increasing the intake pressure when necessary. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of this boiler.

[0021] Figure 2 yes Figure 1 Enlarged view of part A in the figure.

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the receiving hopper.

[0023] In the figure, 1. water tank; 11. exhaust gas inlet pipe; 12. exhaust gas outlet pipe; 13. steam outlet pipe; 14. water inlet pipe; 2. heating liner; 21. spiral guide groove; 3. rotating frame; 31. spoke plate; 32. permanent magnet strip; 33. receiving hopper; 34. material guide pipe; 35. filter screen; 36. transition pipe 1; 37. transition pipe 2; 38. guide part 1; 39. guide part 2; 41. first pulley; 42. reduction motor; 43. second pulley; 44. belt; 5. flow limiting valve. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] like Figure 1 , Figure 2 and Figure 3As shown, it includes a water tank 1, an exhaust gas inlet pipe 11, an exhaust gas outlet pipe 12, a steam outlet pipe 13, a water inlet pipe 14 and a heated inner tank 2, the steam outlet pipe 13 is connected to the top of the water tank 1, the water inlet pipe 14 is connected to the bottom of the water tank 1, the heated inner tank 2 is a cylinder with a spiral guide groove 21, the exhaust gas inlet pipe 11 is connected to the lower end of the heated inner tank 2, the exhaust gas outlet pipe 12 is connected to the upper end of the heated inner tank 2, and a rotating frame 3 is rotatably connected to the outside of the heated inner tank 2. The rotating frame 3 includes a plurality of spokes 31 uniformly distributed on the outside of the heated inner tank 2 in the circumferential direction, and a permanent magnet strip 32 located in the water tank 1 is fixedly arranged on the inner side of the spoke 31. A receiving hopper 33 is fixedly arranged at the bottom of the heated inner tank 2, and the lower end of the receiving hopper 33 is gradually It gradually contracts to form a material guide pipe 34, which is connected to the inner wall of the heated inner tank 2. The end of the material guide pipe 34 is connected to the lower end of the spiral guide groove 21, and the upper end of the spiral guide groove 21 smoothly transitions to the inner wall of the heated inner tank 2. A filter screen 35 with a conical cylindrical structure is connected between the outer edge of the large-diameter end of the hopper 33 and the inner wall of the heated inner tank 2. The hopper 33 is located above the exhaust gas intake pipe 11; the cross-section of the spiral guide groove 21 is a semicircular curved surface, and the hopper 33 is equipped with a number of steel balls with a diameter smaller than that of the spiral guide groove 21. The heated inner tank 2 and the hopper 33 are both made of high-temperature resistant polymer materials; the permanent magnet strip 32 can cover the entire wall of the heated inner tank 2 where the spiral guide groove 21 is located.

[0026] The exhaust gas inlet pipe 11 and the exhaust gas outlet pipe 12 are both rotatably connected with a shaft sleeve, and the rotating frame 3 is fixed between the two shaft sleeves.

[0027] A first pulley 41 is fixedly provided on the shaft sleeve on the exhaust gas outlet pipe 12, a reduction motor 42 is provided on the inner wall of the water tank 1, a second pulley 43 is fixedly provided on the output shaft of the reduction motor 42, and a belt 44 is connected between the first pulley 41 and the second pulley 43.

[0028] The lower end of the heated inner tank 2 is connected to the exhaust gas inlet pipe 11 via a conical transition pipe 36, and the upper end of the heated inner tank 2 is connected to the exhaust gas outlet pipe 12 via a conical transition pipe 37. The radial plate 31 has an inclined guide portion 38 at the transition pipe 36, and the radial plate 31 has an inclined guide portion 39 at the transition pipe 37.

[0029] The flow guide part 1 38 is located above the water surface of the water tank 1. A flow limiting valve 5 is arranged on the exhaust gas outlet pipe 12.

[0030] Specifically, the material of the heated inner container 2 and the receiving hopper 33 can be polyphenylene or polyarylate.

[0031] The waste gas for waste heat utilization enters the heating inner tank 2 through the waste gas inlet pipe 11, and is guided by the receiving hopper 33 and the transition pipe 36. The waste gas passes through the filter 35 along the inner wall of the heating inner tank 2 and enters the area where the spiral guide groove 21 is located, thereby enhancing the contact between the waste gas and the inner wall of the heating inner tank 2, and utilizing the high temperature difference between the waste gas and water to achieve rapid exchange of heat energy, thereby avoiding the waste of heat energy caused by the waste gas being discharged directly through the middle of the heating inner tank 2. Furthermore, after the waste gas enters the heating inner tank 2, it is affected by the spiral guide groove 21, which extends the rising path of the waste gas, thereby making fuller use of the heat. The circumference of the heating inner tank 2 is cylindrical with the spiral guide groove 21, which can increase the heating area of ​​the heating inner tank 2. In addition, the heating inner tank 2 has a larger diameter, which can greatly increase the heating surface area of ​​the heating inner tank 2.

[0032] The waste heat is discharged from the exhaust gas outlet pipe 12, and the reduction motor 42 drives the rotating frame 3 to rotate, so that the spoke plate 31 rotates slowly outside the heated inner tank 2. Of course, the reduction motor 42 can be normally open or turned on as needed. The rotation of the rotating frame 3 can enable the permanent magnetic strip 32 on the spoke plate 31 to lift the steel ball along the spiral guide groove 21. After lifting to the top end of the spiral guide groove 21, since the steel ball is no longer supported, it cannot continue to stay on the inner wall of the heated inner tank 2 only by the adsorption of the permanent magnetic strip 32. The steel ball slides from the inner wall of the heated inner tank 2 to the receiving hopper 33 or the outer periphery of the receiving hopper 33. On the filter screen 35, under the guidance of the filter screen 35 and the heated inner pot 2, the steel balls enter the guide tube 34. Since the guide tube 34 smoothly transitions to the lower end opening of the spiral guide groove 21, the steel balls can be adsorbed by the permanent magnet strip 32 and then circulate in the spiral guide groove 21 from bottom to top, thereby circulating. During the upward movement, the steel balls rub against the inner wall of the spiral guide groove 21, so that the scale in the spiral guide groove 21 is cleaned. During the downward movement, the steel balls can also clean the raised parts between adjacent spiral guide grooves 21 to a certain extent, thereby the heated surface of the heated inner pot 2 can be cleaned online.

[0033] In fact, the spiral guide groove 21 in the heating surface of the heated inner tank 2 is easily fouled due to its concave shape, while the convex part is not easily fouled due to the airflow, so the movement of the steel ball in the spiral guide groove 21 during its upward movement can better clean the heated inner tank 2.

[0034] The existence of the filter 35 , on the one hand, does not affect the exhaust gas from entering the heated inner tank 2 , and on the other hand, can receive and guide the falling steel balls to enter the receiving hopper 33 .

[0035] In this solution, the heated inner tank 2 has a large heating area, and the permanent magnetic strip 32 is located in the water tank 1 , the temperature of which will not be too high because water has a constant boiling point, and will not seriously affect the magnetism of the permanent magnetic strip 32 .

[0036] The guide part 2 39 at the lower end of the auxiliary plate can stir the water in the water tank 1 to a certain extent, so that the water in the water tank 1 can convect better and accelerate the generation of steam. The guide part 1 38 at the upper end of the spoke plate 31 can stir and drive away the steam above the water surface better, so that the water vapor concentration above the water surface is not too high, thereby improving the efficiency of water vapor generation by the water surface.

[0037] By adjusting the pressure limiting valve, the exhaust gas outlet pressure can be adjusted, thereby adjusting the circulation pressure and flow rate of the exhaust gas in the heated inner tank 2, so that the scale in the heated inner tank 2 can be discharged through high-pressure exhaust gas when necessary, and the peeled scale in the heated inner tank 2 can be discharged by increasing the intake pressure when necessary.

[0038] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A boiler with automatic cleaning of heating surfaces, characterized in that: The invention comprises a water tank (1), an exhaust gas inlet pipe (11), an exhaust gas outlet pipe (12), a steam outlet pipe (13), a water inlet pipe (14) and a heated inner tank (2), wherein the steam outlet pipe (13) is connected to the top of the water tank (1), the water inlet pipe (14) is connected to the bottom of the water tank (1), the heated inner tank (2) is cylindrical and has a spiral guide groove (21), the exhaust gas inlet pipe (11) is connected to the lower end of the heated inner tank (2), the exhaust gas outlet pipe (12) is connected to the upper end of the heated inner tank (2), a rotating frame (3) is rotatably connected to the outside of the heated inner tank (2), the rotating frame (3) comprises a plurality of radial plates (31) uniformly distributed on the outside of the heated inner tank (2), a permanent magnetic strip (32) located in the water tank (1) is fixedly arranged on the inner side of the radial plates (31), a receiving hopper (33) is fixedly arranged at the bottom of the heated inner tank (2), and the receiving hopper (33) The lower end of the material receiving hopper (33) gradually contracts to form a material guide pipe (34), the material guide pipe (34) is connected to the inner wall of the heated inner container (2), the end of the material guide pipe (34) is connected to the lower end of the spiral guide groove (21), the upper end of the spiral guide groove (21) and the inner wall of the heated inner container (2) are smoothly transitioned, a filter screen (35) with a conical cylindrical structure is connected between the outer edge of the large diameter end of the material receiving hopper (33) and the inner wall of the heated inner container (2), the material receiving hopper (33) is located above the exhaust gas intake pipe (11); the cross section of the spiral guide groove (21) is a semicircular curved surface, the material receiving hopper (33) contains a plurality of steel balls with a diameter smaller than that of the spiral guide groove (21), the heated inner container (2) and the material receiving hopper (33) are both made of high temperature resistant polymer material; the permanent magnetic strip (32) can cover the entire peripheral wall of the heated inner container (2) where the spiral guide groove (21) is located.

2. A boiler with automatic heating surface cleaning according to claim 1, characterized in that: The exhaust gas inlet pipe (11) and the exhaust gas outlet pipe (12) are both rotatably connected to a shaft sleeve, and the rotating frame (3) is fixed between the two shaft sleeves.

3. A boiler with automatic heating surface cleaning according to claim 1 or 2, characterized in that: A first pulley (41) is fixedly arranged on the shaft sleeve on the exhaust gas outlet pipe (12), a reduction motor (42) is arranged on the inner wall of the water tank (1), a second pulley (43) is fixedly arranged on the output shaft of the reduction motor (42), and a belt (44) is connected between the first pulley (41) and the second pulley (43).

4. A boiler with automatic heating surface cleaning according to claim 1 or 2, characterized in that: The lower end of the heated inner tank (2) is connected to the exhaust gas inlet pipe (11) via a conical transition pipe 1 (36), and the upper end of the heated inner tank (2) is connected to the exhaust gas outlet pipe (12) via a conical transition pipe 2 (37), the radial plate (31) has an inclined guide portion 1 (38) at the transition pipe 1 (36), and the radial plate (31) has an inclined guide portion 2 (39) at the transition pipe 2 (37).

5. A boiler with automatic heating surface cleaning according to claim 4, characterized in that: The first guide portion (38) is located above the water surface of the water tank (1).

6. A boiler with automatic heating surface cleaning according to claim 1 or 2, characterized in that: The exhaust gas outlet pipe (12) is provided with a flow limiting valve (5).

7. A boiler with automatic heating surface cleaning according to claim 1 or 2, characterized in that: The heating inner container (2) and the receiving hopper (33) are made of polyphenylene or polyarylate.

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