Boiler with three longitudinally-arranged boiler barrels

Abstract

The utility model relates to the technical field of boilers, in particular to a boiler with three longitudinally-arranged boiler barrels, which comprises a boiler body, a lower boiler barrel is fixedly connected to the lower position in the boiler body, a combustion chamber is fixedly connected to the lower position in the lower boiler barrel, and an ash removal mechanism is arranged in the combustion chamber. Through the mode that the ash removal mechanism is arranged in the combustion chamber, when the combustor combusts and outputs heat to generate hot air flow and the air flow passes through the impeller, potential energy generated by flowing of the air flow can push the impeller to rotate, and therefore the rotating ring is driven to rotate in the combustion chamber; the rotating resistance of the rotating ring can be greatly reduced, and smoke dust attached to the inner wall of the combustion chamber is continuously scraped in the rotating process of the scraping strips connected with the outer wall of the rotating ring, so that the situation that the smoke dust is accumulated on the heating surface of the combustion chamber, a heat insulation layer is formed, and the heat transfer efficiency of the combustion chamber is reduced is avoided.

Description

Technical Field

[0001] This utility model relates to the field of boiler technology, specifically a three-drum longitudinal boiler. Background Technology

[0002] A three-drum longitudinal boiler is a specific type of boiler structure, primarily composed of three longitudinally arranged drums. Generally, the steam drum, also known as the steam chamber, mainly functions as a steam-water separator, separating steam and water to ensure the quality of the output steam. The middle and lower drums play crucial roles in water circulation and heat transfer. This three-drum longitudinal layout makes the boiler structurally more compact and occupies relatively less space. Simultaneously, this structure facilitates the rational flow of water and steam between the different drums, improving thermal efficiency and operational stability.

[0003] Existing technology, such as publication number CN201221839Y, provides a three-drum quick-assembly water-tube boiler. The boiler adopts a three-drum longitudinal "D"-shaped arrangement, including an economizer, downcomer, top drum, riser, and boiler body. The top drum is located above the boiler body and supported by the riser. The economizer is located on the left side of the boiler body. The boiler body includes a middle drum, a lower drum, a convection tube bundle, and a furnace. The middle and lower drums are arranged vertically, and the convection tube bundle connects the middle drum and the lower drum. Between the cylinders, the furnace is located to the right of the intermediate boiler drum, the convection tube bundle, and the lower boiler drum. The furnace is formed by a left membrane wall, a right membrane wall, a front membrane wall, and a rear membrane wall. The left and right membrane walls are directly connected to the intermediate boiler drum and the lower boiler drum. The front and rear membrane walls are connected by an upper header and a lower header. The upper header is connected to the intermediate boiler drum, and the lower header is connected to the lower boiler drum. The top boiler drum is connected to the lower boiler drum by a downcomer, and the top boiler drum is connected to the intermediate boiler drum by a riser. The top boiler drum is connected to the superheater.

[0004] However, during operation, soot accumulates on the boiler's heating surface, forming an insulating layer that hinders radiative heat transfer from the high-temperature flames and hot furnace walls to the heating surface. This reduces radiative heat transfer efficiency. Previously, a clean heating surface could efficiently absorb radiative heat from the furnace, causing the water inside the tubes to heat up rapidly. However, with soot accumulation, the radiative heat is blocked by the soot layer, and only a portion of the heat can penetrate to reach the heating surface, thus slowing down the water's heating rate. Therefore, we propose a three-drum longitudinal boiler. Utility Model Content

[0005] The purpose of this utility model is to provide a three-drum longitudinal boiler, which solves the problem that the accumulation of soot on the boiler heating surface forms a heat insulation layer, which hinders the radiative heat transfer from the high-temperature flame and the hot furnace wall to the heating surface, resulting in a reduction in radiative heat transfer efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A three-drum longitudinal boiler includes a furnace body, a lower drum fixedly connected to the lower part of the furnace body, a combustion chamber fixedly connected to the lower part of the lower drum, a burner fixedly connected to one end of the combustion chamber outside the lower drum, a flue gas pipe fixedly connected to the other end of the combustion chamber away from the burner, and a ash removal mechanism provided inside the combustion chamber.

[0008] The ash removal mechanism includes two sets of rotating rings, which are rotatably connected to both ends of the inner wall of the combustion chamber. Multiple scraper blades are fixedly connected to the outer walls of the two sets of rotating rings, and the scraper blades are spiral-shaped. An impeller is fixedly connected to the inner wall of the rotating ring near the flue gas pipe through a bracket. An ash discharge pipe is fixedly connected to the combustion chamber at the position below the flue gas pipe.

[0009] Preferably, the outer wall of the rotating ring is connected to multiple ball bearings, and the ball bearings are evenly distributed on the outer wall of the rotating ring and are connected to the inner wall of the combustion chamber in a rolling manner.

[0010] Preferably, a dust collection box is fixedly connected to the bottom of the flue pipe, and a drawer is slidably connected to the inner wall of the dust collection box.

[0011] Preferably, the top of the ash collection box is fixedly connected to an ash discharge hopper, and the ash discharge hopper is fixedly connected to the bottom of the flue gas pipe.

[0012] Preferably, a middle drum is fixedly connected inside the furnace body above the lower drum, and a flue gas passage is provided between the lower drum and the middle drum. This flue gas passage is connected to a flue gas pipe through a first pipe. A steam chamber is fixedly connected inside the furnace body above the middle drum, and a flue gas passage is provided between the steam chamber and the middle drum. An exhaust pipe is fixedly connected to one end of this flue gas passage above the flue gas pipe. The two flue gas passages between the steam chamber and the middle and lower drums are connected through a second pipe. A wire mesh separator is provided inside the steam chamber to capture small water droplets carried in the steam and return them to the water.

[0013] Preferably, the lower drum is located above the burner and connected to a water inlet pipe, and the gas chamber is located at one end of the exhaust pipe and fixedly connected to a steam pipe.

[0014] Preferably, the lower pot drum is connected to the middle pot drum through a first heat riser pipe, and the first heat riser pipe is arranged on both sides between the middle pot drum and the lower pot drum, and the outer wall of the first heat riser pipe is wrapped with a first heat-conducting plate. The middle pot drum is connected to the gas chamber through a second heat riser pipe, and the second heat riser pipe is arranged on both sides between the middle pot drum and the gas chamber, and the outer wall of the second heat riser pipe is wrapped with a second heat-conducting plate.

[0015] By employing the above technical solution, this utility model provides a three-drum longitudinally arranged boiler. It possesses at least the following beneficial effects:

[0016] I. This utility model, by setting a ash removal mechanism in the combustion chamber, when the burner outputs heat to generate hot airflow, the potential energy generated by the airflow when passing through the impeller will drive the impeller to rotate, thereby driving the rotating ring to rotate in the combustion chamber. Since the rotating ring is equipped with ball bearings at the contact position with the inner wall of the combustion chamber, the resistance of the rotating ring can be greatly reduced through rolling contact. During the rotation of the scraper connected to the outer wall of the rotating ring, the dust attached to the inner wall of the combustion chamber is continuously scraped off. Since the scraper is spiral, the dust falling to the bottom of the inner wall of the combustion chamber will be continuously pushed to the ash discharge pipe for discharge during the rotation, so as to avoid the dust accumulating on the heating surface of the combustion chamber, forming a heat insulation layer, affecting the heat transfer efficiency of the combustion chamber and reducing the heating efficiency of the water inside the lower drum.

[0017] II. This utility model transfers heat to the water inside the lower boiler drum through the combustion chamber, facilitating comprehensive heating of the water inside the lower boiler drum. The flue gas generated by combustion inside the combustion chamber enters the flue gas passage between the lower and middle boiler drums through the flue gas pipe and the first pipe, then enters the flue gas passage between the air jacket and the middle boiler drum through the second pipe, and finally exits at the exhaust pipe. By the way the flue gas meanders through the flue gas passages inside the lower and middle boiler drums and the air jacket, the passage time of the flue gas is extended, which facilitates the transfer of residual heat in the flue gas to the interior of the middle boiler drum and the air jacket, thereby improving the heat utilization rate. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a partial cross-sectional view of the present invention;

[0021] Figure 3 This is a diagram showing the internal structure of the lower boiler drum in this utility model;

[0022] Figure 4This is a structural diagram showing the transfer ring, scraper, and impeller of this utility model.

[0023] In the diagram: 1. Furnace body; 10. Water inlet pipe; 11. Lower drum; 111. First heat riser pipe; 112. First heat conduction plate; 12. Middle drum; 121. Second heat riser pipe; 122. Second heat conduction plate; 13. Gas manifold; 14. Burner; 15. Combustion chamber; 16. Flue gas pipe; 161. First pipe; 162. Second pipe; 163. Exhaust pipe; 17. Steam pipe; 2. Ash removal mechanism; 21. Rotary ring; 211. Ball bearing; 22. Scraper; 23. Impeller; 231. Support; 24. Ash discharge pipe; 25. Ash collection box; 251. Drawer box; 26. Ash discharge hopper. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1

[0026] A type of three-drum longitudinal boiler, such as Figures 1-4 As shown, the furnace includes a furnace body 1. A lower boiler drum 11 is fixedly connected to the lower part of the furnace body 1. A combustion chamber 15 is fixedly connected to the lower part of the lower boiler drum 11. A burner 14 is fixedly connected to one end of the combustion chamber 15 outside the lower boiler drum 11. A flue gas pipe 16 is fixedly connected to the other end of the combustion chamber 15 away from the burner 14. A ash removal mechanism 2 is installed inside the combustion chamber 15. The ash removal mechanism 2 includes two sets of rotating rings 21, which are rotatably connected to the combustion chamber 15. At both ends of the inner wall, and on the outer wall of the two sets of rotating rings 21, multiple scraper blades 22 are fixedly connected, and the scraper blades 22 are spiral-shaped. On the inner wall of the combustion chamber 15 near the flue gas pipe 16, an impeller 23 is fixedly connected to the inner wall of the rotating ring 21 through a bracket 231. The combustion chamber 15 is fixedly connected to the ash discharge pipe 24 at the position below the flue gas pipe 16. Multiple ball bearings 211 are rolledly connected to the outer wall of the rotating ring 21, and the ball bearings 211 are evenly distributed on the outer wall of the rotating ring 21 and rolledly connected to the inner wall of the combustion chamber 15.

[0027] In this embodiment, by setting a cleaning mechanism 2 in the combustion chamber 15, when the burner 14 generates hot airflow by burning heat, the potential energy generated by the airflow when passing through the impeller 23 will drive the impeller 23 to rotate, thereby driving the rotating ring 21 to rotate in the combustion chamber 15. Since the rotating ring 21 is provided with ball bearings 211 at the contact position with the inner wall of the combustion chamber 15, the resistance to the rotation of the rotating ring 21 can be greatly reduced by the rolling contact. During the rotation of the scraper 22 connected to the outer wall of the rotating ring 21, the dust attached to the inner wall of the combustion chamber 15 is continuously scraped off. Since the scraper 22 is spiral, the dust falling to the bottom of the inner wall of the combustion chamber 15 will be continuously pushed to the position of the ash discharge pipe 24 for discharge during the rotation, so as to avoid the dust accumulating on the heating surface of the combustion chamber 15, forming a heat insulation layer, affecting the heat transfer efficiency of the combustion chamber 15 and causing a decrease in the heating efficiency of the water inside the lower boiler drum 11.

[0028] Example 2

[0029] like Figure 2 , Figure 3 As shown, a dust collection box 25 is fixedly connected to the bottom of the flue gas pipe 16, a drawer 251 is slidably connected to the inner wall of the dust collection box 25, and a discharge hopper 26 is fixedly connected to the top of the dust collection box 25, and the discharge hopper 26 is fixedly connected to the bottom of the flue gas pipe 16.

[0030] In this embodiment, the smoke and dust discharged from the flue pipe 16 will fall into the ash collection box 25 for collection. When the hot airflow passes through the vertical channel of the flue pipe 16, it will perform secondary separation on some of the heavier smoke and dust remaining in the hot airflow. The heavier smoke and dust will fall from the ash discharge hopper 26 into the ash collection box 25 due to its own gravity, so as to facilitate the subsequent removal of the extraction box 251 for centralized treatment of the collected dust.

[0031] Example 3

[0032] like Figure 1 , Figure 2As shown, a middle drum 12 is fixedly connected inside the furnace body 1 above the lower drum 11. A flue gas passage is provided between the lower drum 11 and the middle drum 12. This flue gas passage is connected to the flue gas pipe 16 through a first pipe 161. A steam chamber 13 is fixedly connected inside the furnace body 1 above the middle drum 12. A flue gas passage is provided between the steam chamber 13 and the middle drum 12. An exhaust pipe 163 is fixedly connected to one end of this flue gas passage above the flue gas pipe 16. The two flue gas passages between the steam chamber 13 and the middle drum 12 and the lower drum 11 are connected through a second pipe 162. A water inlet pipe 10 is connected to the lower drum 11 above the burner 14. A steam pipe 17 is fixedly connected to one end of the steam chamber 13 at the exhaust pipe 163. A wire mesh separator is provided inside the steam chamber 13 to capture small water droplets carried in the steam and return the water droplets to the water.

[0033] In this embodiment, heat is transferred to the water inside the lower boiler drum 11 through the combustion chamber 15 to facilitate comprehensive heating of the water inside the lower boiler drum 11. The flue gas generated by combustion inside the combustion chamber 15 enters the flue gas passage between the lower boiler drum 11 and the middle boiler drum 12 through the flue gas pipe 16 and the first pipe 161, then enters the flue gas passage between the air chamber 13 and the middle boiler drum 12 through the second pipe 162, and finally exits at the exhaust pipe 163. By the way the flue gas meanders through the flue gas passages inside the lower boiler drum 11, the middle boiler drum 12 and the air chamber 13, the passage time of the flue gas is extended, so as to facilitate the transfer of residual heat in the flue gas to the interior of the middle boiler drum 12 and the air chamber 13, thereby improving the heat utilization rate.

[0034] Example 4

[0035] like Figure 1 , Figure 2 As shown, the lower pot drum 11 is connected to the middle pot drum 12 through the first heat riser pipe 111, and the first heat riser pipe 111 is arranged on both sides between the middle pot drum 12 and the lower pot drum 11. The outer wall of the first heat riser pipe 111 is wrapped with a first heat-conducting plate 112. The middle pot drum 12 is connected to the gas chamber 13 through the second heat riser pipe 121, and the second heat riser pipe 121 is arranged on both sides between the middle pot drum 12 and the gas chamber 13. The outer wall of the second heat riser pipe 121 is wrapped with a second heat-conducting plate 122.

[0036] In this embodiment, by connecting the first heat riser 111 and the second heat riser 121 between the lower boiler drum 11, the middle boiler drum 12, and the steam drum 13, when the flue gas passes through, the heat in the flue gas will be transferred to the water on the inner wall of the first heat riser 111 and the second heat riser 121 through the first heat conduction plate 112 and the second heat conduction plate 122. As the water temperature rises, the thermal motion between molecules intensifies and the intermolecular distance increases, resulting in volume expansion. By utilizing the pressure increase caused by volume expansion and the thermal convection phenomenon due to temperature difference, the water can be heated sufficiently to form steam.

[0037] In operation, this utility model discloses a three-drum longitudinal boiler. By installing a cleaning mechanism 2 within the combustion chamber 15, when the burner 14 generates hot airflow from combustion, the potential energy generated by the airflow passing through the impeller 23 drives the impeller 23 to rotate, thereby causing the rotating ring 21 to rotate within the combustion chamber 15. Because ball bearings 211 are installed at the contact points between the rotating ring 21 and the inner wall of the combustion chamber 15, the resistance to rotation of the rotating ring 21 is significantly reduced through rolling contact. During rotation, the scraper strips 22 connected to the outer wall of the rotating ring 21 continuously scrape away the adhering soot and dust from the inner wall of the combustion chamber 15. The scraper 22 is spiral-shaped, which pushes the soot falling to the bottom of the inner wall of the combustion chamber 15 towards the ash discharge pipe 24 during rotation, thus preventing the soot from accumulating on the heated surface of the combustion chamber 15 and forming a heat insulation layer, which would reduce the heat transfer efficiency of the combustion chamber 15. The soot discharged from the flue pipe 16 falls into the ash collection box 25 for collection. When the hot air flows through the vertical channel of the flue pipe 16, some of the heavier soot remaining in the hot air will be separated a second time. The heavier soot will fall from the ash discharge hopper 26 into the ash collection box 25 due to its own gravity, so that the collection box 251 can be pulled out later to concentrate the collected dust. The combustion chamber 15 transfers heat to the water inside the lower drum 11, facilitating comprehensive heating of the water inside the lower drum 11. The flue gas generated during combustion in the combustion chamber 15 enters the flue gas passage between the lower drum 11 and the middle drum 12 via the flue gas pipe 16 and the first pipe 161, then enters the flue gas passage between the air chamber 13 and the middle drum 12 via the second pipe 162, and finally exits at the exhaust pipe 163. By meandering through the flue gas passages between the lower drum 11, the middle drum 12, and the air chamber 13, the passage time of the flue gas is extended, facilitating the transfer of residual heat from the flue gas to the middle drum 11. 2. The interior of the steam chamber 13 is connected to the lower boiler drum 11, the middle boiler drum 12, and the steam chamber 13 to improve heat utilization. When the flue gas passes through, the heat in the flue gas is transferred through the first heat-conducting plate 112 and the second heat-conducting plate 122 to the water inside the first heat-conducting pipe 111 and the second heat-conducting pipe 121. As the water temperature rises, the thermal motion between molecules intensifies and the intermolecular distance increases, resulting in volume expansion. By utilizing the increased pressure caused by volume expansion and the thermal convection phenomenon due to temperature difference, the water can be heated sufficiently to form steam.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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 process, method, article, or apparatus.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A three-drum longitudinal boiler, comprising a boiler body (1), characterized in that: The furnace body (1) is fixedly connected to the lower part of the furnace body (1). The lower part of the furnace body (11) is fixedly connected to the combustion chamber (15). The end of the combustion chamber (15) located outside the lower part of the furnace body (11) is fixedly connected to the burner (14). The end of the combustion chamber (15) away from the burner (14) is fixedly connected to the flue gas pipe (16). The combustion chamber (15) is equipped with a ash removal mechanism (2). The ash removal mechanism (2) includes two sets of rotating rings (21). The two sets of rotating rings (21) are rotatably connected to both ends of the inner wall of the combustion chamber (15). Multiple scraper blades (22) are fixedly connected to the outer wall of the two sets of rotating rings (21), and the scraper blades (22) are spiral. An impeller (23) is fixedly connected to the inner wall of the rotating ring (21) near the flue gas pipe (16) through a bracket (231). An ash discharge pipe (24) is fixedly connected to the combustion chamber (15) at the position below the flue gas pipe (16).

2. A three-drum longitudinal boiler according to claim 1, characterized in that: The outer wall of the rotating ring (21) is connected to multiple balls (211), and the balls (211) are evenly distributed on the outer wall of the rotating ring (21) and are connected to the inner wall of the combustion chamber (15).

3. A three-drum longitudinal boiler according to claim 1, characterized in that: The bottom of the flue pipe (16) is fixedly connected to an ash collection box (25), and the inner wall of the ash collection box (25) is slidably connected to a drawer (251).

4. A three-drum longitudinal boiler according to claim 3, characterized in that: The top of the ash collection box (25) is fixedly connected to the ash discharge hopper (26), and the ash discharge hopper (26) is fixedly connected to the bottom of the flue gas pipe (16).

5. A three-drum longitudinal boiler according to claim 1, characterized in that: The furnace body (1) is fixedly connected to the middle drum (12) above the lower drum (11) and a flue gas passage is opened between the lower drum (11) and the middle drum (12). The flue gas passage is connected to the flue gas pipe (16) through the first pipe (161). The furnace body (1) is fixedly connected to the gas chamber (13) above the middle drum (12) and a flue gas passage is opened between the gas chamber (13) and the middle drum (12). The end of the flue gas passage above the flue gas pipe (16) is fixedly connected to the exhaust pipe (163). The two flue gas passages between the gas chamber (13) and the middle drum (12) and the lower drum (11) are connected through the second pipe (162). The gas chamber (13) is equipped with a wire mesh separator to capture the small water droplets carried in the steam and return the water droplets to the water.

6. A three-drum longitudinal boiler according to claim 5, characterized in that: The lower drum (11) is located above the burner (14) and is connected to a water inlet pipe (10). The steam drum (13) is located at one end of the exhaust pipe (163) and is fixedly connected to a steam pipe (17).

7. A three-drum longitudinal boiler according to claim 5, characterized in that: The lower boiler drum (11) is connected to the middle boiler drum (12) through a first heat riser pipe (111), and the first heat riser pipe (111) is arranged on both sides between the middle boiler drum (12) and the lower boiler drum (11), and the outer wall of the first heat riser pipe (111) is wrapped with a first heat-conducting plate (112). The middle boiler drum (12) is connected to the gas chamber (13) through a second heat riser pipe (121), and the second heat riser pipe (121) is arranged on both sides between the middle boiler drum (12) and the gas chamber (13), and the outer wall of the second heat riser pipe (121) is wrapped with a second heat-conducting plate (122).

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