A waste heat recovery device for a steam boiler

Abstract

The present application relates to the technical field of waste heat recovery, and discloses a waste heat recovery device of a steam boiler, which comprises a boiler body, a flue pipe, a fixing pipe, a heat recovery assembly and a discharge pipe arranged on the top of the boiler body, and the flue pipe is fixedly communicated with the top of the boiler body; flue gas enters the chimney through the flue pipe and the fixing pipe, and exchanges heat with multiple groups of heat-conducting plates; heat is transferred to the flow channels of the chimney and the movable cylinder and the flow channels of the movable cylinder and the fixed cylinder through the heat-conducting plates, so as to heat the combustion-supporting air introduced into the flow channels of the fixed cylinder and the movable cylinder through the air inlet pipe and the boiler feed water introduced into the flow channels of the movable cylinder and the chimney through the water inlet pipe, respectively; the contact between the flue gas and the plate surface can be strengthened through the rotation of the heat-conducting plates, the heat transfer area and the waste heat recovery efficiency are improved, and the heat loss is reduced; meanwhile, the air flow channel is arranged outside the water flow channel, the heat dissipated in the secondary use of water flow can be utilized, and the waste heat utilization efficiency and the recovery effect are further improved.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology, and in particular to a waste heat recovery device for a steam boiler. Background Technology

[0002] A steam boiler is a special type of equipment that converts the chemical energy of fuel into thermal energy, and then transfers the thermal energy to the working fluid water in the boiler drum through the heating surface, heating the water to boiling and generating steam. It is widely used in industrial production, district heating, and power generation. Its working process is as follows: fuel is mixed with combustion air and burned in the furnace, releasing a large amount of thermal energy and generating high-temperature flue gas. The high-temperature flue gas transfers heat to the water-cooled walls, economizer, and other heating surfaces through radiation heat exchange (furnace area) and convection heat exchange (flue heating surface). The water in the boiler drum absorbs heat and rises to the saturation temperature at the corresponding pressure, vaporizing to generate saturated steam. The low-temperature flue gas, after releasing heat, is purified by dust removal, desulfurization, and denitrification, and then discharged into the atmosphere through the flue by the induced draft fan.

[0003] In existing flue gas emission systems, flue gas must first undergo purification treatment to remove dust particles before entering the economizer located upstream of the air preheater. This economizer works in conjunction with the subsequent air preheater to heat boiler feedwater and combustion air. However, since dust particles usually carry a certain amount of heat energy, the current process of using cyclone separators for separation results in a large loss of heat energy, leading to low heat utilization efficiency and thus restricting the waste heat recovery effect.

[0004] Therefore, there is a need to provide a waste heat recovery device for steam boilers, which aims to solve the above problems. Summary of the Invention

[0005] The main objective of this invention is to provide a waste heat recovery device for a steam boiler, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A waste heat recovery device for a steam boiler includes a boiler body. The top of the boiler body is provided with a flue pipe, a fixed pipe, a heat recovery component, and an exhaust pipe. The flue pipe is fixedly connected to the top of the boiler body. The heat recovery component includes a sealing seat one, a sealing seat two, and a heat recovery mechanism. The sealing seat one is fixedly connected to the flue pipe through the fixed pipe, and the exhaust pipe is fixedly installed inside the sealing seat two.

[0008] The heat recovery mechanism includes a fixed cylinder, a movable cylinder, and a chimney. The fixed cylinder and the movable cylinder are rotatably connected between a sealing seat one and a sealing seat two. The chimney is rotatably connected inside the chimney and is rotatably connected between a fixed pipe and an exhaust pipe. The movable cylinder is located between the fixed cylinder and the chimney. Multiple heat-conducting plates are fixedly connected inside the chimney. The heat-conducting plates penetrate through and are fixedly installed inside the movable cylinder. A movable pipe is fixedly connected to one end of each of the multiple heat-conducting plates.

[0009] The top of the boiler body is also provided with a drive assembly, which is used to drive the movable cylinder to rotate. A cleaning mechanism is provided on the outside of the movable tube, which is used to clean the surface of the heat-conducting plate.

[0010] As a further improvement to the above solution, an air inlet pipe and a water inlet pipe are fixedly connected inside the sealing seat one, and a water outlet pipe and an air outlet pipe are fixedly connected inside the sealing seat two. The water outlet pipe is fixedly connected to the boiler body through a connecting pipe two, and the air outlet pipe is fixedly connected to the boiler body through a connecting pipe one. The opposite ends of the air inlet pipe and the air outlet pipe both pass through the space between the fixed cylinder and the movable cylinder, and the opposite ends of the water inlet pipe and the water outlet pipe both pass through the space between the movable cylinder and the chimney.

[0011] As a further improvement to the above solution, a protective sleeve is fixedly connected to the top of the boiler body, and the heat recovery mechanism is located inside the protective sleeve.

[0012] As a further improvement to the above solution, the drive assembly includes a mounting bracket fixedly connected to the top of the boiler body, a motor fixedly mounted on the top of the mounting bracket, a driven wheel fixedly connected to the outer side of the movable cylinder, a drive shaft rotatably connected to the top of the mounting bracket, a drive wheel fixedly connected to the outer side of the drive shaft, the drive wheel and the driven wheel meshing with each other, the drive shaft being fixedly connected to the motor output shaft via a coupling, and the discharge pipe being fixedly connected inside the mounting bracket.

[0013] As a further improvement to the above solution, a filter assembly is provided at the end of the discharge pipe away from the heat recovery assembly. The filter assembly includes a mounting base movably installed on the outside of the discharge pipe, a filter element movably installed inside the mounting base, and a scraper fixedly connected to the outside of the movable pipe.

[0014] As a further improvement to the above solution, the cleaning mechanism includes a reciprocating screw disposed inside the movable tube. One end of the reciprocating screw is fixedly connected to the inside of the mounting base. Multiple sealing blocks are slidably connected to the outside of the movable tube. A cleaning frame is fixedly connected to the outside of the sealing blocks. Each cleaning frame is slidably connected between two adjacent heat-conducting plates. A slider is fixedly connected to the inside of the sealing block. A reciprocating helical drive is formed between the slider and the reciprocating screw.

[0015] As a further improvement to the above solution, two fan blades are fixedly connected to one end of the movable pipe near the mounting base, and the fan blades are located inside the discharge pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. After the flue gas enters the chimney through the flue pipe and fixed pipe, it exchanges heat with multiple sets of heat-conducting plates. The heat is transferred through the heat-conducting plates to the flow channels between the chimney and the movable cylinder, and between the movable cylinder and the fixed cylinder, respectively heating the combustion air introduced into the flow channels of the fixed cylinder and the movable cylinder through the air inlet pipe, and the boiler feedwater introduced into the flow channels of the movable cylinder and the chimney through the water inlet pipe. Furthermore, the rotation of the heat-conducting plates can enhance the contact between the flue gas and the plate surface, increase the heat transfer area and waste heat recovery efficiency, and reduce heat loss. At the same time, the air flow channel is arranged outside the water flow channel, which can reuse the heat dissipated during the water heating process, further improving the waste heat utilization efficiency and recovery effect.

[0018] 2. The heat-conducting plate is driven by the movable tube to rotate synchronously with the cleaning mechanism. The slider in the cleaning mechanism and the fixed reciprocating screw form a helical transmission, which in turn drives the sealing block to reciprocate. The sealing block, in conjunction with the cleaning frame, cleans the surface of the heat-conducting plate to prevent dust accumulation and reduced heat transfer efficiency. In addition, the sealing block can effectively block dust from entering the gap between the movable tube and the reciprocating screw, ensuring transmission stability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the boiler body of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the heat recovery component of the present invention;

[0023] Figure 4 This is a schematic diagram of the internal structure of the protective sleeve of the present invention;

[0024] Figure 5 This is a schematic diagram of the internal structure of the fixing cylinder of the present invention;

[0025] Figure 6 This is a schematic diagram of the internal structure of the movable cylinder of the present invention;

[0026] Figure 7 This is a schematic diagram of the internal structure of the sealing seat of the present invention;

[0027] Figure 8 This is a schematic diagram of the internal structure of the sealing seat II of the present invention;

[0028] Figure 9 This is a schematic diagram of the internal structure of the fixing cylinder of the present invention;

[0029] Figure 10 This is a schematic diagram of the structure of the partition of the present invention;

[0030] Figure 11 This is a schematic diagram of the cleaning frame and sealing block of the present invention;

[0031] Figure 12 This is a schematic diagram of the internal structure of the active tube of the present invention;

[0032] Figure 13 This is a schematic diagram of the structure of the filter assembly of the present invention;

[0033] Figure 14 This is a schematic diagram of the reciprocating lead screw of the present invention.

[0034] In the diagram: 1. Boiler body; 2. Flue pipe; 3. Fixed pipe; 4. Heat recovery assembly; 41. Protective sleeve; 42. Sealing seat one; 43. Sealing seat two; 441. Air inlet pipe; 442. Water inlet pipe; 443. Water outlet pipe; 444. Air outlet pipe; 45. Heat recovery mechanism; 451. Fixed cylinder; 452. Movable cylinder; 453. Heat-conducting plate; 454. Chimney; 455. Movable pipe; 456. Fan blade; 46. Cleaning mechanism; 461. Cleaning frame; 462. Sealing block; 463. Slider; 464. Reciprocating screw; 5. Discharge pipe; 6. Drive assembly; 61. Mounting bracket; 62. Motor; 63. Drive shaft; 64. Drive wheel; 65. Driven wheel; 7. Filter assembly; 71. Mounting seat; 72. Filter element; 73. Scraper; 8. Connecting pipe one; 9. Connecting pipe two. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0036] Please see Figures 1 to 14 As shown, the present invention provides an embodiment:

[0037] A waste heat recovery device for a steam boiler includes a boiler body 1. The top of the boiler body 1 is provided with a flue pipe 2, a fixed pipe 3, a heat recovery component 4, and an exhaust pipe 5. The flue pipe 2 is fixedly connected to the top of the boiler body 1. The heat recovery component 4 includes a first sealing seat 42, a second sealing seat 43, and a heat recovery mechanism 45. The first sealing seat 42 is fixedly connected to the flue pipe 2 through the fixed pipe 3. The exhaust pipe 5 is fixedly installed inside the second sealing seat 43.

[0038] The heat recovery mechanism 45 includes a fixed cylinder 451, a movable cylinder 452, and a chimney 454. The fixed cylinder 451 and the movable cylinder 452 are rotatably connected between a first sealing seat 42 and a second sealing seat 43. The chimney 454 is rotatably connected inside the chimney 454 and is rotatably connected between a fixed pipe 3 and an exhaust pipe 5. The movable cylinder 452 is located between the fixed cylinder 451 and the chimney 454. Multiple heat-conducting plates 453 are fixedly connected inside the chimney 454. The heat-conducting plates 453 penetrate through and are fixedly installed inside the movable cylinder 452. A movable pipe 455 is fixedly connected to one end of each heat-conducting plate 453.

[0039] A drive assembly 6 is also provided on the top of the boiler body 1. The drive assembly 6 is used to drive the movable cylinder 452 to rotate. A cleaning mechanism 46 is provided on the outside of the movable tube 455. The cleaning mechanism 46 is used to clean the surface of the heat conduction plate 453.

[0040] The sealing seat 42 is internally fixedly connected to an air inlet pipe 441 and a water inlet pipe 442. The sealing seat 43 is internally fixedly connected to a water outlet pipe 443 and an air outlet pipe 444. The water outlet pipe 443 is fixedly connected to the boiler body 1 through a connecting pipe 9. The air outlet pipe 444 is fixedly connected to the boiler body 1 through a connecting pipe 8. The opposite ends of the air inlet pipe 441 and the air outlet pipe 444 both pass through the space between the fixed cylinder 451 and the movable cylinder 452. The opposite ends of the water inlet pipe 442 and the water outlet pipe 443 both pass through the space between the movable cylinder 452 and the chimney 454.

[0041] In practical applications, the embodiments of the present invention, such as Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 9 As shown, the high-temperature flue gas generated by the boiler body 1 is discharged through the flue pipe 2 and then transported to the heat recovery component 4 through the fixed pipe 3. It then enters the inside of the chimney 454 of the heat recovery mechanism 45 through the sealing seat 42. At this time, the multiple heat-conducting plates 453 fixed inside the chimney 454 are in direct contact with the high-temperature flue gas. They absorb the sensible heat in the flue gas by utilizing their high-efficiency heat conduction characteristics. Since the heat-conducting plates 453 penetrate the movable cylinder 452, their heat can be transferred simultaneously to the flow channel between the movable cylinder 452 and the chimney 454, as well as the flow channel between the fixed cylinder 451 and the movable cylinder 452, forming a dual-path heat transfer structure.

[0042] like Figures 3 to 9 As shown, during the heat recovery process, combustion air enters the annular flow channel between the fixed cylinder 451 and the movable cylinder 452 through the air inlet pipe 441, and boiler feedwater enters the annular flow channel between the movable cylinder 452 and the chimney 454 through the water inlet pipe 442. During the flow process, the two media absorb heat through the heat conduction plate 453, the temperature of the combustion air rises, forming high-temperature combustion air, which returns to the boiler body 1 through the air outlet pipe 444 and the connecting pipe 18, providing preheated air for fuel combustion and enhancing combustion efficiency. After absorbing heat, the boiler feedwater temperature rises, and it is returned to the boiler body 1 through the water outlet pipe 443 and the connecting pipe 29, reducing the energy consumption of boiler heating feedwater and realizing the cascade utilization of waste heat.

[0043] like Figures 2 to 5 as well as Figure 8 As shown, the drive assembly 6 drives the movable cylinder 452 to rotate, which in turn drives the heat-conducting plate 453 connected to it to rotate synchronously. This dynamic process not only increases the contact frequency between the heat-conducting plate 453 and the flue gas, but also breaks the boundary layer thermal resistance by disturbing the flue gas flow field, significantly improving the heat transfer coefficient and enhancing the heat exchange efficiency. At the same time, the cleaning mechanism 46 on the outside of the movable tube 455 moves synchronously with the heat-conducting plate 453 to clean the flue gas side and medium side surface of the heat-conducting plate 453 in real time, avoiding the accumulation of dust to form a thermal resistance layer and ensuring that the heat-conducting plate 453 maintains high-efficiency heat transfer performance for a long time.

[0044] Finally, the low-temperature flue gas that has completed heat exchange enters the discharge pipe 5 through the chimney 454 and is discharged, realizing the deep recovery and efficient utilization of the waste heat of the boiler flue gas.

[0045] like Figures 2 to 6 As shown, a protective sleeve 41 is fixedly connected to the top of the boiler body 1, and the heat recovery mechanism 45 is located inside the protective sleeve 41.

[0046] In practical applications, the protective sleeve 41 on the top of the boiler body 1 forms a closed protective space for the internal heat recovery mechanism 45, which can effectively block the influence of external environmental factors on the core heat exchange components such as the fixed cylinder 451, the movable cylinder 452, and the heat conduction plate 453 in the heat recovery mechanism 45. At the same time, it reduces the dissipation of heat to the outside during the heat recovery process, reduces heat loss, and ensures that the heat recovery mechanism 45 achieves efficient heat exchange under stable operating conditions.

[0047] like Figures 2 to 5 as well as Figure 8As shown, the drive assembly 6 includes a mounting bracket 61 fixedly connected to the top of the boiler body 1. A motor 62 is fixedly mounted on the top of the mounting bracket 61. A driven wheel 65 is fixedly connected to the outer side of the movable cylinder 452. A drive shaft 63 is rotatably connected to the top of the mounting bracket 61. A drive wheel 64 is fixedly connected to the outer side of the drive shaft 63. The drive wheel 64 and the driven wheel 65 mesh with each other. The drive shaft 63 is fixedly connected to the output shaft of the motor 62 through a coupling. The discharge pipe 5 is fixedly connected to the inside of the mounting bracket 61.

[0048] In practical application, the drive assembly 6 uses the mounting bracket 61 to securely assemble components such as the motor 62 and drive shaft 63 with the boiler body 1. After the motor 62 is started, its output shaft drives the drive shaft 63 to rotate through the coupling. The drive wheel 64 on the outside of the drive shaft 63 rotates accordingly and drives the movable cylinder 452 to rotate synchronously through meshing transmission with the driven wheel 65. This provides stable power for the dynamic heat exchange of the heat transfer plate 453 and the ash removal operation of the cleaning mechanism 46. At the same time, the discharge pipe 5 is fixed inside the mounting bracket 61 to ensure the structural stability of the flue gas emission path. The whole system forms a compact and efficient power transmission system, ensuring the dynamic operation performance of the heat recovery mechanism 45.

[0049] like Figure 6 , Figure 8 and Figure 13 As shown, a filter assembly 7 is provided at the end of the discharge pipe 5 away from the heat recovery assembly 4. The filter assembly 7 includes a mounting base 71 that is movably installed on the outside of the discharge pipe 5. A filter element 72 is movably installed inside the mounting base 71. A scraper 73 is fixedly connected to the outside of the movable pipe 455.

[0050] In practical applications, the filter assembly 7 is connected to the discharge pipe 5 via the mounting base 71 to form a modular structure that can be quickly disassembled, facilitating the periodic replacement and maintenance of the filter element 72. When the flue gas after heat exchange flows out through the discharge pipe 5, the filter element 72 intercepts and filters the fine particulate matter in the flue gas. The purified flue gas is discharged through the outlet of the mounting base 71. During this process, the scraper 73 on the outside of the movable pipe 455 rotates synchronously with the heat conduction plate 453. Its scraper blades remain in contact with the inner wall of the filter element 72, dynamically scraping the particulate matter deposited on the inner wall of the filter element 72. This prevents the filter element 72 from becoming clogged, thus significantly extending the service life of the filter element 72 and reducing maintenance costs while ensuring that the flue gas meets emission standards.

[0051] like Figure 6 as well as Figures 10 to 14As shown, the cleaning mechanism 46 includes a reciprocating screw 464 disposed inside the movable tube 455. One end of the reciprocating screw 464 is fixedly connected to the inside of the mounting base 71. Multiple sealing blocks 462 are slidably connected to the outside of the movable tube 455. A cleaning frame 461 is fixedly connected to the outside of the sealing block 462. The cleaning frame 461 is slidably connected between two adjacent heat-conducting plates 453. A slider 463 is fixedly connected to the inside of the sealing block 462. A reciprocating helical drive is formed between the slider 463 and the reciprocating screw 464.

[0052] Two fan blades 456 are fixedly connected to one end of the active pipe 455 near the mounting base 71. The fan blades 456 are located inside the discharge pipe 5.

[0053] In practical application, when the motor 62 starts, the power is transmitted sequentially through the drive shaft 63, drive wheel 64, and driven wheel 65 to the movable cylinder 452, causing it to drive the heat-conducting plate 453 and the movable tube 455 to rotate synchronously. The movable tube 455 drives the fan blade 456 to drive the flow of flue gas. At this time, the reciprocating screw 464 fixed in the mounting base 71 and the slider 463 in the movable tube 455 form a helical transmission pair, which converts the rotational motion of the movable tube 455 into the axial reciprocating motion of the sealing block 462, so that the cleaning frame 461 performs periodic scraping between adjacent heat-conducting plates 453, decoupling the operation of the cleaning mechanism 46 from the flue gas conditions. The cleaning frequency can be precisely controlled by adjusting the speed of the motor 62, and effective cleaning can still be maintained even when running at low load. Compared with the traditional passive cleaning method, the waste heat recovery efficiency is improved.

[0054] In addition, when the internal pressure of the boiler body 1 is too high, the motor 62 can be turned off, and the fan blades 456 can be rotated by the flowing flue gas to achieve self-cleaning of the heat conduction plate 453.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery device for a steam boiler, comprising a boiler body (1), characterized in that: The top of the boiler body (1) is provided with a flue pipe (2), a fixed pipe (3), a heat recovery assembly (4) and a discharge pipe (5), the flue pipe (2) is fixedly communicated with the top of the boiler body (1), the heat recovery assembly (4) comprises a sealing seat one (42), a sealing seat two (43) and a heat recovery mechanism (45), the sealing seat one (42) is fixedly communicated with the flue pipe (2) through the fixed pipe (3), and the discharge pipe (5) is fixedly installed in the inside of the sealing seat two (43); The heat recovery mechanism (45) comprises a fixed cylinder (451), a movable cylinder (452) and a smoke cylinder (454), the fixed cylinder (451) and the movable cylinder (452) are both rotationally connected between the sealing seat one (42) and the sealing seat two (43), the smoke cylinder (454) is rotationally connected to the inside of the smoke cylinder (454), the smoke cylinder (454) is rotationally connected between the fixed pipe (3) and the discharge pipe (5), the movable cylinder (452) is located between the fixed cylinder (451) and the smoke cylinder (454), a plurality of heat-conducting plates (453) are fixedly connected to the inside of the smoke cylinder (454), the heat-conducting plates (453) penetrate and are fixedly installed in the inside of the movable cylinder (452), and opposite ends of the plurality of heat-conducting plates (453) are fixedly connected with movable pipes (455); The top of the boiler body (1) is also provided with a driving assembly (6), the driving assembly (6) is used for driving the movable cylinder (452) to rotate, and the outside of the movable pipe (455) is provided with a cleaning mechanism (46), and the cleaning mechanism (46) is used for cleaning the surface of the heat-conducting plate (453); The inside of the sealing seat one (42) is fixedly connected with an air inlet pipe (441) and a water inlet pipe (442), the inside of the sealing seat two (43) is fixedly connected with a water outlet pipe (443) and an air outlet pipe (444), the water outlet pipe (443) is fixedly communicated with the boiler body (1) through a connecting pipe two (9), the air outlet pipe (444) is fixedly communicated with the boiler body (1) through a connecting pipe one (8), and opposite ends of the air inlet pipe (441) and the air outlet pipe (444) both penetrate between the fixed cylinder (451) and the movable cylinder (452), and opposite ends of the water inlet pipe (442) and the water outlet pipe (443) both penetrate between the movable cylinder (452) and the smoke cylinder (454); One end of the discharge pipe (5) away from the heat recovery assembly (4) is provided with a filter assembly (7), the filter assembly (7) comprises a mounting seat (71) movably mounted on the outside of the discharge pipe (5), a filter element (72) is movably mounted in the inside of the mounting seat (71), and the outside of the movable pipe (455) is fixedly connected with a scraping strip (73). The cleaning mechanism (46) comprises a reciprocating screw rod (464) arranged inside the movable pipe (455), one end of the reciprocating screw rod (464) is fixedly connected to the inside of the mounting seat (71), the outer side of the movable pipe (455) is slidably connected with a plurality of sealing blocks (462), the outer side of the sealing block (462) is fixedly connected with a cleaning frame (461), the cleaning frame (461) is slidably connected between two adjacent heat conducting plates (453), the inner side of the sealing block (462) is fixedly connected with a sliding block (463), and the reciprocating screw rod (464) and the sliding block (463) form a reciprocating screw transmission therebetween. The end of the movable pipe (455) close to the mounting seat (71) is fixedly connected with two flaps (456), and the flaps (456) are located inside the discharge pipe (5).

2. A steam boiler waste heat recovery device according to claim 1, characterized in that: The top of the boiler body (1) is fixedly connected with a protective sleeve (41), and the heat recovery mechanism (45) is located inside the protective sleeve (41).

3. A steam boiler waste heat recovery device according to claim 1, characterized in that: The driving assembly (6) comprises a mounting frame (61) fixedly connected to the top of the boiler body (1), a motor (62) fixedly installed at the top of the mounting frame (61), a driven wheel (65) fixedly connected to the outer side of the movable cylinder (452), a driving shaft (63) rotatably connected to the top of the mounting frame (61), a driving wheel (64) fixedly connected to the outer side of the driving shaft (63), and the driving wheel (64) and the driven wheel (65) are in meshing engagement, the driving shaft (63) is fixedly connected with the output shaft of the motor (62) through a shaft coupling, and the discharge pipe (5) is fixedly connected to the inside of the mounting frame (61).

Images