Large thermal cycle waste heat boiler

Abstract

The invention discloses a large heat cycle waste heat boiler, which relates to the field of waste heat boilers, and comprises a boiler body, a plurality of groups of heating surfaces are arranged in the boiler body at intervals along the flue gas flowing direction, the large heat cycle waste heat boiler further comprises heat exchange pipes, the heat exchange pipes are arranged at intervals along the width direction of the boiler body, and the bottom ends and the top ends of the heat exchange pipes are respectively connected with water circulation pipelines. The heat exchange pipe and a water circulation pipeline in the furnace body form a heating surface, two adjacent groups of heating surfaces in the furnace body can respectively move horizontally and transversely and vertically relative to the furnace body, and the gas pocket is positioned at the top end of the outer part of the furnace body and is used for being connected with the water circulation pipeline of the heat exchange pipe. When the overlapping area of the heat exchange tubes of the adjacent heating surfaces needs to be adjusted according to the smoke flowing speed, the heating surfaces are pushed by the pushing assembly to transversely move in the horizontal direction, and the adjacent heating surfaces can be adjusted to the overlapping area most suitable for heat conduction on the premise that the structural strength of the heating surfaces is kept.

Description

Technical Field

[0001] The invention relates to the field of waste heat boilers, in particular to a large-scale heat cycle waste heat boiler. Background Art

[0002] In the context of today's energy industry, improving the economic efficiency of power plants is of great significance to promoting sustainable development. As the core equipment for improving energy utilization efficiency, the design optimization of waste heat boilers plays a key role in reducing operating costs and improving energy conversion efficiency.

[0003] The existing waste heat boiler is composed of a boiler drum, a movable smoke hood, a furnace mouth flue, an inclined first flue, an inclined second flue, a last flue, a last second flue, a feeding pipe (feeding chute), an oxygen gun mouth, a nitrogen sealing device and a nitrogen sealing plug, an inlet hole, a micro-differential pressure taking device, a flue support and a hanger, etc. The flue gas in the waste heat boiler flows through the heating surface, the temperature of the water in the heat exchange tube of the heating surface increases, and a part of the water is vaporized to form a steam-water mixture in the heat exchange tube, while the water arranged in the downcomer on the outer side of the furnace wall is not heated, and its density is greater than the density of the steam-water mixture, so it flows downward to supplement the heating surface, and the cycle is repeated, and the state change of water is used to realize the transfer and conversion of heat.

[0004] With respect to the above-mentioned related technologies, the heating surfaces in the existing large-scale heat cycle waste heat boilers are mostly fixedly installed. When the heating surfaces are arranged in multiple layers, the heat exchange tubes of each layer of the heating surfaces are generally staggered or arranged in an array in the boiler. When the flue gas pressure changes, the existing waste heat boilers can no longer make adjustments between the appropriate windward area and the more efficient heat exchange efficiency. Too fast wind speeds are likely to reduce the stability of the staggered heat exchange tubes due to the increase in flue gas pressure, and the arranged heat exchange tubes are not easy to efficiently exchange heat under slower wind speeds. In summary, it is not easy for the heating surfaces in the existing large-scale heat cycle waste heat boilers to adjust the windward area according to the flue gas pressure. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a large-scale heat cycle waste heat boiler to solve the technical problem that the heating surface in the existing large-scale heat cycle waste heat boiler is not easy to adjust the wind receiving area according to the flue gas pressure.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a large-scale heat cycle waste heat boiler, comprising a furnace body, wherein a plurality of groups of heating surfaces are arranged at intervals along the flue gas flow direction in the furnace body, and further comprising heat exchange tubes, wherein the heat exchange tubes are arranged at intervals along the width direction of the furnace body, and the bottom and top ends are respectively connected to water circulation pipelines, wherein the heat exchange tubes and the water circulation pipelines in the furnace body constitute heating surfaces, and two adjacent groups of heating surfaces in the furnace body can respectively move horizontally and vertically relative to the furnace body, and further comprising an air bag, wherein the air bag is located at the top end outside the furnace body and is used to be connected to the water circulation pipeline of the heat exchange tube.

[0007] By adopting the above technical solution, when it is necessary to adjust the overlapping area of ​​the heat exchange tubes of adjacent heating surfaces according to the flue gas flow rate, the pushing component is used to push the heating surface to move laterally in the horizontal direction, so that the adjacent heating surfaces can be adjusted to the overlapping area with the most suitable heat conduction while maintaining the structural strength of the heating surface.

[0008] The present invention is further configured such that a confluence bag is installed on one side of the air bag of the furnace body, and the confluence bag and the air bag are connected through confluence pipes arranged at intervals along the width direction of the furnace body.

[0009] Preferably, the manifold inputs the water-gas mixture collected in the manifold bag into the steam drum.

[0010] The present invention is further configured such that a first collector and a third collector are provided at the top of the cabinet body and are parallel to each other, while a second collector and a fourth collector are provided at the bottom of the cabinet body and heat exchange tubes are arranged at intervals between the first collector and the second collector along the width direction of the furnace body, and heat exchange tubes are also arranged at intervals between the third collector and the fourth collector along the width direction of the furnace body.

[0011] Preferably, the heat exchange tubes between the first manifold and the second manifold together constitute a first heating surface, and the heat exchange tubes between the third manifold and the fourth manifold together constitute a second heating surface.

[0012] The present invention is further configured such that the top and bottom ends of the interior of the furnace body are fixedly connected with sliding grooves for horizontally sliding the first manifold and the second manifold, the bottom end of the interior of the cabinet body is vertically slidably connected with a lifting groove for supporting the fourth manifold, the bottom end of the lifting groove is connected with a lifting mechanism, and a telescopic supporting mechanism is arranged between the top end of the third manifold and the inner wall of the furnace body.

[0013] Preferably, the first heating surface can slide horizontally in the sliding groove, and the second heating surface can adjust its height in the vertical direction under the lifting of the lifting mechanism.

[0014] The present invention is further configured such that the first manifold is connected to a first sliding sleeve that passes through the furnace body toward one side of the furnace body, the other end of the first sliding sleeve is slidably connected to the manifold package along the axis of the manifold package, the end of the first manifold away from the first sliding sleeve is connected to a telescopic mechanism, the second manifold is slidably connected along its own axis to a first downcomer that passes through the furnace body toward the other side of the furnace body, the other end of the first downcomer is connected to the air bag, and the end of the second manifold away from the first downcomer is connected to a telescopic mechanism.

[0015] Preferably, a telescopic mechanism is used to push the first heating surface to move horizontally.

[0016] The present invention is further configured as follows: the third manifold is connected with a second bent pipe passing through the furnace body toward one side of the furnace body, the top end of the second bent pipe is slidably connected to the second sliding sleeve along the vertical direction, the other end of the second sliding sleeve is connected to the manifold bag, the fourth manifold is connected with a first bent pipe passing through the furnace body toward the other side of the furnace body, the first bent pipe is slidably connected to the second downcomer along the vertical direction, the other end of the second downcomer is connected to the air bag, and the first bent pipe and the second bent pipe are both fixedly connected with a slide plate vertically slidably connected to the outer wall of the furnace body.

[0017] Preferably, a lifting mechanism is used to achieve vertical movement of the second heating surface.

[0018] The present invention is further configured such that a heat insulating ring is provided on the outer wall of the second curved pipe, and a sealing ring is provided between the heat insulating ring and the inner wall of the second sliding sleeve.

[0019] Preferably, the heat-insulating ring can effectively prevent the sealing ring from leaking due to frequent deformation caused by temperature difference.

[0020] The present invention is further configured such that a leak-proof ring is fixedly connected to the end of the second curved pipe, and an edge of the leak-proof ring is in contact with an inner wall of the second sliding sleeve.

[0021] Preferably, the anti-leakage ring can further prevent the leakage of the soda-water mixture.

[0022] The present invention is further configured such that the heating surface capable of horizontally moving in the furnace body is closer to the smoke inlet direction of the furnace body than the heating surface capable of vertically moving.

[0023] Preferably, the first heating surface is arranged at a position where it contacts the flue gas first, which can effectively prevent the flue gas from damaging the other heating surface.

[0024] In summary, the present invention mainly has the following beneficial effects:

[0025] 1. The present invention provides a heating surface capable of horizontal movement in the furnace body, and respectively provides a sliding sleeve structure for maintaining communication at the top and bottom of the heating surface. When the overlapping area of ​​the heat exchange tubes of adjacent heating surfaces needs to be adjusted according to the flow rate of flue gas, the heating surface is pushed to move laterally in the horizontal direction by a pushing assembly, so that the adjacent heating surfaces can be adjusted to the overlapping area of ​​the most suitable heat conduction while maintaining the structural strength of the heating surfaces.

[0026] 2. The present invention adjusts the height of the heating surface through the lifting structure, so that the heating surface that can adjust the height is adjacent to the heating surface that can adjust the horizontal position. When the heat exchange efficiency of the heating surface needs to be further adjusted, the height of the fin structure on the surface of the heat exchange tube can be adjusted to achieve the height dislocation. When the flue gas flow rate is not high, the heat exchange efficiency of the heat exchange tube can be further improved. When the flue gas flow rate is fast, the height of the heating surface is adjusted to make the fins of the heat exchange tube at the same height, thereby avoiding damage to the heat exchange caused by the influence of airflow;

[0027] 3. The present invention provides a heat-insulating ring in the sliding sleeve structure, which can effectively prevent the expansion or contraction of the sealing ring caused by heat conduction when the mixture of steam and water flows through the sliding sleeve structure, and avoid frequent deformation of the sealing ring. On the premise of maintaining the shape of the sealing ring, the sealing effect of the sealing ring is effectively improved, and water leakage at the sliding sleeve structure is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A perspective view of the present invention;

[0029] Figure 2 It is a three-dimensional diagram of the internal structure of the furnace body of the present invention;

[0030] Figure 3 For the present invention Figure 2 A magnified view of middle;

[0031] Figure 4 For the present invention Figure 2 Enlarged view of middle B;

[0032] Figure 5 A three-dimensional diagram of the internal structure of the furnace body from another perspective of the present invention;

[0033] Figure 6 It is a three-dimensional diagram of the cross-sectional state of the internal structure of the furnace body of the present invention;

[0034] Figure 7 For the present invention Figure 6 Enlarged view of middle C;

[0035] Figure 8 It is a schematic diagram of the internal structure of the second sliding sleeve and the second curved pipe in a sliding connection state according to the present invention.

[0036] Description of reference numerals:

[0037] 1. Furnace body; 101. Slide groove; 102. Slide plate; 2. Air bag; 3. Confluence bag; 301. Confluence pipe; 4. First confluence pipe; 5. Second confluence pipe; 6. Third confluence pipe; 7. Fourth confluence pipe; 8. Heat exchange tube; 9. First downcomer; 10. Second downcomer; 11. First elbow; 12. First sliding sleeve; 13. Second sliding sleeve; 14. Second elbow; 15. Telescopic push rod; 16. Sliding groove; 17. Lifting groove; 18. Lifting push rod; 19. Support groove; 20. Telescopic guide rod; 21. Leak-proof ring; 22. Heat insulation ring; 23. Sealing ring. DETAILED DESCRIPTION

[0038] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] The following describes an embodiment of the present invention based on its overall structure.

[0040] First embodiment:

[0041] Large heat cycle waste heat boiler, please refer to Figure 1-8 , including a furnace body 1, in which a plurality of groups of heating surfaces are arranged at intervals along the flue gas flow direction, each group of heating surfaces includes at least two mutually parallel heating surfaces, and also includes a heat exchange tube 8. Specifically, the outer wall of the heat exchange tube 8 is provided with annular fins for improving the heat exchange efficiency at intervals along the axial direction, the heat exchange tube 8 is arranged at intervals along the width direction of the furnace body 1, and the bottom end and the top end are respectively connected with water circulation pipelines, the heat exchange tube 8 and the water circulation pipeline in the furnace body 1 constitute a heating surface, and the two adjacent groups of heating surfaces in the furnace body 1 can move horizontally and vertically relative to the furnace body 1, respectively, and also includes an air bag 2, which is located at the top end outside the furnace body 1 and is used to be connected to the water circulation pipeline of the heat exchange tube 8.

[0042] In the above embodiments, please refer to Figure 1-7 A confluence bag 3 is installed on one side of the gas bag 2 of the furnace body 1. The confluence bag 3 and the gas bag 2 are connected by confluence pipes 301 arranged at intervals along the width direction of the furnace body 1. The confluence pipe 301 inputs the water-gas mixture collected in the confluence bag 3 into the steam bag. Specifically, the water-gas mixture refers to a mixture of water vapor and water droplets.

[0043] Furthermore, a first manifold 4 and a third manifold 6 are parallel to each other at the top end of the furnace body 1, and a second manifold 5 and a fourth manifold 7 are parallel to each other at the bottom end. Heat exchange tubes 8 are arranged at intervals between the first manifold 4 and the second manifold 5 along the width direction of the furnace body 1, and heat exchange tubes 8 are also arranged at intervals between the third manifold 6 and the fourth manifold 7 along the width direction of the furnace body 1. The heat exchange tubes 8 between the first manifold 4 and the second manifold 5 together constitute a first heating surface, and the heat exchange tubes 8 between the third manifold 6 and the fourth manifold 7 together constitute a second heating surface. Specifically, the first heating surface can be moved horizontally to adjust its position, and the second heating surface can be moved vertically to adjust its position, thereby realizing the adjustment of the wind receiving area of ​​the heat exchange tube 8 and the wind receiving area of ​​the fins on the surface of the heat exchange tube 8.

[0044] In the above embodiments, please refer to Figure 2-7 The top and bottom ends of the furnace body 1 are fixedly connected with sliding grooves 16 for horizontal and transverse sliding of the first collector 4 and the second collector 5. The bottom end of the furnace body 1 is slidably connected with a lifting groove 17 for carrying the fourth collector 7 in the vertical direction. The bottom end of the lifting groove 17 is connected with a lifting mechanism. Specifically, the lifting structure is an interval-arranged lifting push rod 18. The telescopic amount of the lifting push rod 18 is greater than the height of the interval between adjacent fins on the heat exchange tube 8. A telescopic supporting mechanism is arranged between the top of the third collector 6 and the inner wall of the furnace body 1. Specifically, the telescopic supporting structure is a supporting groove 19 slidably arranged on the top of the furnace body 1 in the vertical direction. The supporting groove 19 is used to support the third collector 6. A telescopic guide rod 20 is arranged between the supporting groove 19 and the top wall of the furnace body 1, so that the first heating surface can slide horizontally and transversely in the sliding groove 16, and the second heating surface can adjust its height in the vertical direction under the lifting of the lifting mechanism.

[0045] In the above embodiments, please refer to Figure 2-7 The first manifold 4 is connected to a first sliding sleeve 12 that passes through the furnace body 1 toward one side of the furnace body 1, and the other end of the first sliding sleeve 12 is slidably connected to the manifold package 3 along the axis of the manifold package 3. The end of the first manifold 4 away from the first sliding sleeve 12 is connected to a telescopic mechanism, and the second manifold 5 is slidably connected along its own axis to a first downcomer 9 that passes through the furnace body 1 toward the other side of the furnace body 1, and the other end of the first downcomer 9 is connected to the air bag 2, and the end of the second manifold 5 away from the first downcomer 9 is connected to a telescopic mechanism, and the telescopic mechanism is used to push the first heating surface to move horizontally and laterally. Specifically, the telescopic mechanism is a telescopic push rod 15, and the telescopic push rods 15 at the top and bottom ends of the furnace body 1 have opposite telescopic directions, so that the first heating surface can be pushed to move horizontally and laterally on the sliding groove 16 during the telescopic adjustment.

[0046] Specifically, the third manifold 6 is connected to a second curved pipe 14 that passes through the furnace body 1 toward one side of the furnace body 1, the top end of the second curved pipe 14 is slidably connected to the second sliding sleeve 13 in the vertical direction, and the other end of the second sliding sleeve 13 is connected to the manifold bag 3, and the fourth manifold 7 is connected to a first curved pipe 11 that passes through the furnace body 1 toward the other side of the furnace body 1, the first curved pipe 11 is slidably connected to the second downcomer 10 in the vertical direction, and the other end of the second downcomer 10 is connected to the air bag 2, and the first curved pipe 11 and the second curved pipe 14 are both fixedly connected to a slide plate 102 that is vertically slidably connected to the outer wall of the furnace body 1, specifically, the slide plate 102 is slidably connected to a slide groove 101 provided on the side wall of the furnace body 1, and the length of the slide groove 101 flowing out in the vertical direction is greater than the length of the slide plate 102, and the first curved pipe 11 and the second curved pipe 14 connected with the slide plate can keep the furnace body 1 from leaking flue gas to the outside during vertical sliding, and the vertical movement of the second heating surface is achieved by utilizing a lifting mechanism.

[0047] Second embodiment:

[0048] Large heat cycle waste heat boiler, please refer to Figure 1-8 An insulation ring 22 is provided on the outer wall of the second curved pipe 14, and a sealing ring 23 is provided between the insulation ring 22 and the inner wall of the second sliding sleeve 13. The insulation ring 22 can prevent the heat in the second curved pipe 14 from being directly transferred to the sealing ring 23, thereby effectively avoiding the leakage of the sealing ring 23 due to frequent deformation due to temperature difference.

[0049] In the above embodiments, please refer to Figure 8 A leak-proof ring 21 is fixedly connected to the end of the second elbow 14. During the relative sliding of the second elbow 14 and the second sliding sleeve 13, the edge of the leak-proof ring 21 contacts the inner wall of the second sliding sleeve 13. The leak-proof ring 21 can further prevent the leakage of the steam-water mixture. Specifically, in other sliding sleeve structures of the present invention, such as the second downcomer 10 and the first elbow 11, the first downcomer 9 and the second manifold 5, and the first sliding sleeve 12 and the manifold package 3, a sealing structure equivalent to that between the second sliding sleeve 13 and the second elbow 14 is provided.

[0050] In the above embodiments, please refer to Figure 1-5 The heating surface that can move horizontally in the furnace body 1 is closer to the smoke entry direction of the furnace body 1 than the heating surface that can move vertically. Since the sliding groove 16 is fixedly connected to the inner wall of the furnace body 1, the first heating surface arranged on the sliding groove 16 can withstand the impact of the smoke better than the other heating surface. Therefore, the first heating surface is arranged at the position that contacts the smoke first, which can effectively prevent the smoke from causing damage to the other heating surface.

[0051] When the present invention is working, the telescopic push rods 15 at the top and bottom of the furnace body 1 extend and retract in opposite directions. During the process of adjusting the extension amount of the telescopic push rods 15, the first manifold 4 and the second manifold 5 slide horizontally and transversely in the sliding grooves 16 at the top and bottom of the furnace body 1 respectively, so as to adjust the horizontal and transverse position of the first heating surface, and then adjust the overlap amount of the contact area between the heat exchange tube 8 and the flue gas between the two heating surfaces. The lifting push rods 18 telescope to adjust the height of the lifting grooves 17, and with the support of the supporting grooves 19, the stable height adjustment of the second heating surface is achieved, and then the height position of the outer wall fins of the heat exchange tubes 8 of the two heating surfaces is adjusted. When the flue gas flow rate is small, the fins between the heat exchange tubes 8 are staggered, and when the flue gas flow rate is large, the fins between the heat exchange tubes 8 are kept at the same height to avoid the second heat exchange surface being damaged by the airflow, so that the area of ​​the heating surface of the large-scale thermal cycle boiler can be adaptively adjusted according to the flue gas flow rate.

[0052] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. Large heat cycle waste heat boiler, characterized in that: include: A furnace body (1), wherein a plurality of groups of heating surfaces are arranged at intervals in the furnace body (1) along the flow direction of smoke; Heat exchange tubes (8), the heat exchange tubes (8) being arranged at intervals along the width direction of the furnace body (1), and having a water circulation pipeline connected to the bottom end and the top end respectively, the heat exchange tubes (8) and the water circulation pipeline in the furnace body (1) forming a heating surface, and two adjacent groups of heating surfaces in the furnace body (1) being able to move horizontally and vertically relative to the furnace body (1); An air bag (2) is located at the top of the outside of the furnace body (1) and is used to be connected to the water circulation pipeline of the heat exchange tube (8).

2. The large-scale heat cycle waste heat boiler according to claim 1 is characterized in that: The furnace body (1) is provided with a confluence bag (3) on one side of the gas bag (2); the confluence bag (3) and the gas bag (2) are connected via confluence pipes (301) arranged at intervals along the width direction of the furnace body (1).

3. The large-scale heat cycle waste heat boiler according to claim 2 is characterized in that: A first collector (4) and a third collector (6) are arranged at the top of the cabinet (1), and a second collector (5) and a fourth collector (7) are arranged at the bottom, wherein heat exchange tubes (8) are arranged at intervals along the width direction of the furnace body (1) between the first collector (4) and the second collector (5), and heat exchange tubes (8) are also arranged at intervals along the width direction of the furnace body (1) between the third collector (6) and the fourth collector (7).

4. The large-scale heat cycle waste heat boiler according to claim 3 is characterized in that: The top and bottom ends of the furnace body (1) are fixedly connected with sliding grooves (16) for horizontally sliding the first collector (4) and the second collector (5); the bottom end of the cabinet (1) is vertically connected with a lifting groove (17) for supporting the fourth collector (7); the bottom end of the lifting groove (17) is connected with a lifting mechanism; and a telescopic supporting mechanism is provided between the top end of the third collector (6) and the inner wall of the furnace body (1).

5. The large-scale heat cycle waste heat boiler according to claim 3 is characterized in that: The first manifold (4) is connected to a first sliding sleeve (12) passing through the furnace body (1) toward one side of the furnace body (1); the other end of the first sliding sleeve (12) is slidably connected to the manifold package (3) along the axis of the manifold package (3); the end of the first manifold (4) away from the first sliding sleeve (12) is connected to a telescopic mechanism; the second manifold (5) is slidably connected to a first downcomer (9) passing through the furnace body (1) toward the other side of the furnace body (1) along its own axis; the other end of the first downcomer (9) is connected to the air bag (2); and the end of the second manifold (5) away from the first downcomer (9) is connected to a telescopic mechanism.

6. The large-scale heat cycle waste heat boiler according to claim 3 is characterized in that: The third manifold (6) is connected to a second curved pipe (14) passing through the furnace body (1) toward one side of the furnace body (1); the top end of the second curved pipe (14) is slidably connected to the second sliding sleeve (13) in the vertical direction; the other end of the second sliding sleeve (13) is connected to the manifold bag (3); the fourth manifold (7) is connected to a first curved pipe (11) passing through the furnace body (1) toward the other side of the furnace body (1); the first curved pipe (11) is slidably connected to the second downcomer (10) in the vertical direction; the other end of the second downcomer (10) is connected to the air bag (2); the first curved pipe (11) and the second curved pipe (14) are both fixedly connected to a slide plate (102) vertically slidably connected to the outer wall of the furnace body (1).

7. The large-scale heat cycle waste heat boiler according to claim 6 is characterized in that: The outer wall of the second curved pipe (14) is provided with a heat-insulating ring (22), and a sealing ring (23) is provided between the heat-insulating ring (22) and the inner wall of the second sliding sleeve (13).

8. The large-scale heat cycle waste heat boiler according to claim 7 is characterized in that: A leak-proof ring (21) is fixedly connected to the end of the second curved pipe (14), and the edge of the leak-proof ring (21) is in contact with the inner wall of the second sliding sleeve (13).

9. The large-scale heat cycle waste heat boiler according to claim 1, characterized in that: The heating surface that can move horizontally in the furnace body (1) is closer to the smoke entry direction of the furnace body (1) than the heating surface that can move vertically.

Images