Fluidized bed boiler capable of improving combustion rate of purified ash
By designing a purified ash auxiliary combustion mechanism in a fluidized bed boiler, the combination of auxiliary baffles, extension baffles and auxiliary air ducts is used to solve the problem that purified ash cannot be burned in the dense phase area, and more efficient combustion efficiency and combustion rate are achieved.
Patent Information
- Application Number
- CN202420509566.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-15
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-03-15
AI Technical Summary
After entering the furnace, the purified ash cannot burn and release heat in the dense phase area, resulting in overtemperature in the upper part of the furnace, severe ash accumulation in the water-cooled wall, superheater, and low combustion efficiency.
A fluidized bed boiler is designed, including a purified ash auxiliary combustion mechanism, which consists of an auxiliary baffle, an extended baffle and an auxiliary air duct. By changing the movement trajectory of the purified ash and accelerating the combustion rate, it ensures that the purified ash is fully burned in the furnace body.
The combustion efficiency of purified ash is effectively improved, the situation where purified ash is directly eliminated from the furnace body is avoided, the combustion rate of purified ash in the flue gas is improved, and the practicality of the device is enhanced.
Smart Images
Figure CN222560013U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fluidized bed boilers, in particular to a fluidized bed boiler capable of improving the combustion rate of purified ash. Background Art
[0002] Purified ash has a huge output in the calcium carbide industry. Since purified ash has fine particles and contains combustibles, directly discarding it is not only uneconomical but also polluting the environment.
[0003] Since the particle size of the purified ash is too small and it cannot be separated by the cyclone separator and then enter the furnace for circulating combustion, the treated purified ash is directly carried by the primary air to the upper part of the furnace or even the tail flue for combustion after entering the furnace. It cannot burn and release heat in the dense phase area, resulting in problems such as overheating of the upper part of the furnace, serious ash accumulation on the water-cooled wall and superheater, and low combustion efficiency.
[0004] For this purpose, a fluidized bed boiler which can improve the combustion rate of purified ash is proposed. Utility Model Content
[0005] The purpose of the utility model is to solve the problem that the purified ash is directly carried to the upper part of the furnace or even the tail flue by the primary wind after entering the furnace and cannot burn and release heat in the dense phase area. The utility model provides a fluidized bed boiler that can improve the combustion rate of purified ash.
[0006] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:
[0007] A fluidized bed boiler capable of improving the combustion rate of purified ash comprises a furnace body, a raw material pipe is fixedly installed at the bottom of one side wall of the furnace body, a secondary air duct is fixedly installed at the outer side wall of the furnace body, the secondary air duct is located directly above the raw material pipe, a slag discharge pipe and a primary air duct are fixedly installed at the bottom of the furnace body, a smoke exhaust hole is opened on the other side wall of the furnace body, and a purified ash auxiliary combustion mechanism is arranged on the furnace body;
[0008] Specifically, when the furnace body is performing combustion operations, the purified ash inside is longitudinally moved by wind and heat energy, and the purified ash is affected by the purified ash auxiliary combustion mechanism, which extends the length of the movement trajectory of the purified ash in the furnace body, thereby ensuring the combustion efficiency of the purified ash.
[0009] Furthermore, the bottom of the smoke exhaust hole is arranged horizontally with the top of the secondary air duct.
[0010] Furthermore, the ash purification auxiliary combustion mechanism includes an auxiliary baffle, an extension baffle and an auxiliary air duct. The inner wall of the furnace body is located on the outer wall of the smoke exhaust hole and the extension baffle is fixedly installed. The extension baffle is arranged in a "C" shape and forms a group of independent flues with the inner wall of the furnace body. The smoke exhaust hole is located at the bottom of the extension baffle. The extension baffle is located on the corresponding side wall of the furnace body and the auxiliary baffle is fixedly installed. The auxiliary baffle is arranged in an inclined structure, and the outer wall of the furnace body is fixedly installed with an auxiliary air duct.
[0011] Specifically, when the purified ash rises in the furnace body, the auxiliary baffle initially blocks the longitudinal movement speed of the purified ash, and at the same time, the auxiliary air duct continues to inject fresh air to accelerate the combustion rate of the purified ash, causing the purified ash to be completely burned. At the same time, the flue gas enters the exhaust hole through the extended baffle for exhaust treatment.
[0012] Furthermore, the number of auxiliary baffles on the extended baffle is one group, the number of auxiliary baffles on the inner wall of the furnace body is two groups, and the auxiliary air duct is located at the interval between the two groups of auxiliary baffles on the inner wall of the furnace body.
[0013] Furthermore, a primary exhaust pipe is fixedly installed on the outer wall of the furnace body located at the outer wall of the exhaust hole, the primary exhaust pipe is arranged in a "Z"-shaped structure, a cyclone separator is fixedly installed on the free end of the primary exhaust pipe, the free end of the primary exhaust pipe is connected to the feed end of the cyclone separator, a return pipe is fixedly installed on the solid material discharge end of the cyclone separator, and the free end of the return pipe is fixedly connected to the furnace body;
[0014] Specifically, when the flue gas enters the extended baffle and the primary exhaust pipe, due to the long path of the extended baffle and the primary exhaust pipe, the burning ash accumulates in the primary exhaust pipe. At the same time, the flue gas enters the cyclone separator to separate the unburned coal particles, and the separated coal particles enter the return pipe for reuse.
[0015] Furthermore, the connection between the free end of the return pipe and the furnace body is located at the interval between the raw material pipe and the secondary air duct, the return pipe is arranged in an inclined structure, and the secondary smoke exhaust pipe is fixedly installed at the smoke discharge end of the cyclone separator.
[0016] Furthermore, the bottom of the return pipe is located at the smoke exhaust hole and is arranged in a funnel-shaped structure, an auxiliary ash discharge pipe is fixedly installed at the bottom of the return pipe, and a stop valve is arranged on the auxiliary ash discharge pipe;
[0017] Specifically, the accumulated ash is in the auxiliary ash discharge pipe, and the user opens the auxiliary ash discharge pipe by opening the stop valve to remove the ash.
[0018] The beneficial effects of the utility model are as follows:
[0019] 1. The utility model provides a purified ash auxiliary combustion mechanism in conjunction with a smoke exhaust hole that changes its position, and uses an auxiliary baffle to effectively increase the combustion time of flue gas fly ash in the furnace, while also avoiding the situation where the purified ash is directly discharged from the furnace body, thereby increasing the burnout rate of carbon particles in the fly ash, allowing the purified ash in the flue gas to be fully burned, and greatly improving the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a structural schematic diagram of the utility model;
[0021] Figure numerals: 1. Auxiliary baffle; 2. Auxiliary air duct; 3. Smoke exhaust hole; 4. Secondary air duct; 5. Furnace body; 6. Raw material pipe; 7. Slag discharge pipe; 8. Primary air duct; 9. Auxiliary ash discharge pipe; 10. Stop valve; 11. Return pipe; 12. Cyclone separator; 13. Secondary smoke exhaust pipe; 14. Primary smoke exhaust pipe; 15. Extension baffle. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0024] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0025] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0026] like Figure 1 As shown, a fluidized bed boiler capable of improving the combustion rate of purified ash comprises a furnace body 5, a raw material pipe 6 is fixedly mounted on the bottom of one side wall of the furnace body 5, a secondary air duct 4 is fixedly mounted on the outer side wall of the furnace body 5, and the secondary air duct 4 is located directly above the raw material pipe 6, a slag discharge pipe 7 and a primary air duct 8 are fixedly mounted on the bottom of the furnace body 5, a smoke exhaust hole 3 is opened on the other side wall of the furnace body 5, and a purified ash auxiliary combustion mechanism is arranged on the furnace body 5;
[0027] Specifically, when the furnace body 5 is performing combustion operations, the purified ash inside is longitudinally moved by wind and heat energy, and the purified ash is affected by the purified ash auxiliary combustion mechanism, which extends the length of the movement trajectory of the purified ash in the furnace body 5, thereby ensuring the combustion efficiency of the purified ash.
[0028] like Figure 1 As shown, the bottom of the smoke exhaust hole 3 and the top of the secondary air duct 4 are arranged horizontally.
[0029] like Figure 1 As shown, the ash purification auxiliary combustion mechanism includes an auxiliary baffle 1, an extension baffle 15 and an auxiliary air duct 2. The inner wall of the furnace body 5 is located on the outer wall of the smoke exhaust hole 3 and the extension baffle 15 is fixedly installed. The extension baffle 15 is arranged in a "C" shape to form a group of independent flues with the inner wall of the furnace body 5. The smoke exhaust hole 3 is located at the bottom of the extension baffle 15. The extension baffle 15 is located on the corresponding side wall of the furnace body 5 and the auxiliary baffle 1 is fixedly installed. The auxiliary baffle 1 is arranged in an inclined structure, and the outer wall of the furnace body 5 is fixedly installed with the auxiliary air duct 2.
[0030] Specifically, when the purified ash rises in the furnace body 5, the auxiliary baffle 1 first blocks the longitudinal movement speed of the purified ash, and at the same time, the auxiliary air duct 2 continues to inject fresh air to accelerate the combustion rate of the purified ash, so that the purified ash is completely burned, and at the same time, the flue gas enters the smoke exhaust hole 3 through the extended baffle 15 for smoke exhaust treatment.
[0031] like Figure 1 As shown, the number of auxiliary baffles 1 on the extended baffle 15 is one group, the number of auxiliary baffles 1 on the inner wall of the furnace body 5 is two groups, and the auxiliary air duct 2 is located at the interval between the two groups of auxiliary baffles 1 on the inner wall of the furnace body 5.
[0032] like Figure 1 As shown, a primary exhaust pipe 14 is fixedly installed on the outer wall of the furnace body 5 located at the outer wall of the exhaust hole 3, and the primary exhaust pipe 14 is arranged in a "Z"-shaped structure. A cyclone separator 12 is fixedly installed on the free end of the primary exhaust pipe 14, and the free end of the primary exhaust pipe 14 is connected to the feed end of the cyclone separator 12. A return pipe 11 is fixedly installed on the solid material discharge end of the cyclone separator 12, and the free end of the return pipe 11 is fixedly connected to the furnace body 5.
[0033] Specifically, after the flue gas enters the extended baffle 15 and the primary smoke exhaust pipe 14, since the extended baffle 15 and the primary smoke exhaust pipe 14 have a long path, the burning ashes are accumulated in the primary smoke exhaust pipe 14. At the same time, the flue gas enters the cyclone separator 12 to separate the unburned coal particles, and the separated coal particles enter the return pipe 11 for reuse.
[0034] like Figure 1As shown, the connection between the free end of the return pipe 11 and the furnace body 5 is located at the interval between the raw material pipe 6 and the secondary air pipe 4. The return pipe 11 is arranged in an inclined structure, and the secondary smoke exhaust pipe 13 is fixedly installed at the smoke discharge end of the cyclone separator 12.
[0035] like Figure 1 As shown, the bottom of the return pipe 11 is located at the smoke exhaust hole 3 and is arranged in a funnel-shaped structure. An auxiliary ash discharge pipe 9 is fixedly installed at the bottom of the return pipe 11, and a stop valve 10 is arranged on the auxiliary ash discharge pipe 9;
[0036] Specifically, the accumulated ash is in the auxiliary ash discharge pipe 9, and the user opens the auxiliary ash discharge pipe 9 by opening the stop valve 10 to remove the ash.
[0037] In summary: when the furnace body 5 is performing combustion operations, the purified ash inside is longitudinally moved by wind force and heat energy, and the purified ash is affected by the purified ash auxiliary combustion mechanism, which extends the length of the movement trajectory of the purified ash in the furnace body 5, thereby ensuring the combustion efficiency of the purified ash. When the purified ash rises in the furnace body 5, the preferential auxiliary baffle 1 initially blocks the longitudinal movement speed of the purified ash, and at the same time, the auxiliary air duct 2 continues to inject fresh air to accelerate the combustion rate of the purified ash, causing the purified ash to be completely burned. At the same time, the flue gas enters the exhaust hole 3 through the extension baffle 15 for exhaust treatment. When the flue gas enters the extension baffle 15 and the primary exhaust pipe 14, due to the longer paths of the extension baffle 15 and the primary exhaust pipe 14, the burning ash is accumulated in the primary exhaust pipe 14. At the same time, the flue gas enters the cyclone separator 12 to separate the unburned coal particles, and the separated coal particles enter the return pipe 11 for reuse. The accumulated ash is in the auxiliary ash discharge pipe 9, and the user opens the auxiliary ash discharge pipe 9 by opening the stop valve 10 to remove the ash.
[0038] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. A fluidized bed boiler capable of improving the combustion rate of purified ash, characterized in that: The furnace body (5) comprises a furnace body (5), a raw material pipe (6) is fixedly mounted on the bottom of one side wall of the furnace body (5), a secondary air pipe (4) is fixedly mounted on the outer side wall of the furnace body (5), the secondary air pipe (4) is located directly above the raw material pipe (6), a slag discharge pipe (7) and a primary air pipe (8) are fixedly mounted on the bottom of the furnace body (5), a smoke exhaust hole (3) is opened on the other side wall of the furnace body (5), and an ash purification auxiliary combustion mechanism is arranged on the furnace body (5).
2. The fluidized bed boiler capable of improving the combustion rate of purified ash according to claim 1, characterized in that: The bottom of the smoke exhaust hole (3) is arranged horizontally with the top of the secondary air duct (4).
3. The fluidized bed boiler capable of improving the combustion rate of purified ash according to claim 1, characterized in that: The purified ash auxiliary combustion mechanism comprises an auxiliary baffle (1), an extended baffle (15) and an auxiliary air duct (2); the inner wall of the furnace body (5) is located on the outer wall of the smoke exhaust hole (3) and is fixedly mounted with the extended baffle (15); the extended baffle (15) is arranged in a "C"-shaped structure and forms a group of independent flues with the inner wall of the furnace body (5); the smoke exhaust hole (3) is located at the bottom of the extended baffle (15); the extended baffle (15) is located on the corresponding side wall of the furnace body (5) and is fixedly mounted with the auxiliary baffle (1); the auxiliary baffle (1) is arranged in an inclined structure; and the outer wall of the furnace body (5) is fixedly mounted with the auxiliary air duct (2).
4. The fluidized bed boiler capable of improving the combustion rate of purified ash according to claim 3, characterized in that: The number of auxiliary baffles (1) on the extended baffle (15) is one group, the number of auxiliary baffles (1) on the inner wall of the furnace body (5) is two groups, and the auxiliary air duct (2) is located at the interval between the two groups of auxiliary baffles (1) on the inner wall of the furnace body (5).
5. The fluidized bed boiler capable of improving the combustion rate of purified ash according to claim 1, characterized in that: A primary smoke exhaust pipe (14) is fixedly mounted on the outer wall of the furnace body (5) located at the outer wall of the smoke exhaust hole (3); the primary smoke exhaust pipe (14) is arranged in a "Z"-shaped structure; a cyclone separator (12) is fixedly mounted on the free end of the primary smoke exhaust pipe (14); the free end of the primary smoke exhaust pipe (14) is connected to the feed end of the cyclone separator (12); a return pipe (11) is fixedly mounted on the solid material discharge end of the cyclone separator (12); and the free end of the return pipe (11) is fixedly connected to the furnace body (5).
6. The fluidized bed boiler capable of improving the combustion rate of purified ash according to claim 5, characterized in that: The connection between the free end of the return pipe (11) and the furnace body (5) is located at the interval between the raw material pipe (6) and the secondary air pipe (4), the return pipe (11) is arranged in an inclined structure, and the secondary smoke exhaust pipe (13) is fixedly installed at the smoke discharge end of the cyclone separator (12).
7. The fluidized bed boiler capable of improving the combustion rate of purified ash according to claim 5, characterized in that: The bottom of the primary smoke exhaust pipe (14) is located at the smoke exhaust hole (3) and is arranged in a funnel-shaped structure. An auxiliary ash exhaust pipe (9) is fixedly installed at the bottom of the primary smoke exhaust pipe (14), and a stop valve (10) is arranged on the auxiliary ash exhaust pipe (9).