Fluidized bed furnace for low-temperature incineration and purification of ash
By setting up multiple air supply ducts on the side wall of the boiling furnace, the ash is purified in a graded combustion, which solves the problem of ash bonding caused by high-temperature incineration, extends the life of refractory materials and reduces polluted gas emissions.
Patent Information
- Application Number
- CN202420223908.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-30
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-01-30
AI Technical Summary
The purified ash produced by the calcium carbide furnace is easily bonded to the side wall of the boiling furnace during high temperature burning, affecting the life of the refractory material.
A low-temperature incineration boiling furnace was designed. By setting up multiple air supply ducts on the side wall of the furnace body, purifying ash in graded combustion, using first-level, second-level and third-level combustion air to improve combustion efficiency step by step, reducing heat release and ash melting .
It effectively reduces the bonding of ash on the side walls of the boiling furnace, extends the life of the refractory material, and reduces the combustion temperature and polluted gas emissions.
Smart Images
Figure CN222210299U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fluidized bed furnaces, in particular to a fluidized bed furnace for low-temperature incineration and purification of ash. Background Art
[0002] Calcium carbide is a very important basic raw material and plays a very important role in my country's economic development. Purified ash is produced in the production process of calcium carbide. Purified ash is a combustible dust. The purified ash can be transported to a boiling furnace for combustion for secondary utilization.
[0003] An ash conveying pipe is provided at the bottom of the boiling furnace, which is used to convey the purified ash to the bottom of the boiling furnace. A wind hood is provided at the bottom of the boiling furnace, and a blower is provided at the wind hood. The blower allows air to enter the furnace at a more appropriate angle, speed and intensity through the wind hood, so as to achieve a better combustion effect.
[0004] In view of the above-mentioned related technologies, the applicant believes that in the related technologies, the purified ash produced by the calcium carbide furnace has a relatively high temperature during the incineration process due to its large fineness and high fixed carbon content. The ash in the purified ash of the calcium carbide furnace has a low melting point. When burned at high temperature, the ash melts and adheres to the vault and side walls of the boiling furnace, making it difficult to clean. In severe cases, it reduces the life of the refractory material and causes high-temperature fractures, which restricts production. Utility Model Content
[0005] The utility model aims to provide a fluidized bed furnace for low-temperature incineration of purified ash, so as to solve the problem that when purified ash is burned at high temperature in the fluidized bed furnace, the ash melts and easily adheres to the side wall of the fluidized bed furnace, thereby affecting the life of the refractory material of the fluidized bed furnace.
[0006] The utility model is realized by the following technical solutions:
[0007] A boiling furnace for low-temperature incineration and purification of ash comprises a furnace body, an ash conveying pipe is connected to the furnace body, a hood group is arranged at the bottom of the furnace chamber of the furnace body, and a plurality of air supply ducts are arranged on the side wall of the furnace body in an interval arrangement along the height direction of the furnace body, one end of the plurality of air supply ducts are connected to the inside of the furnace body, and the other end of the plurality of air supply ducts are connected to the outside of the furnace body.
[0008] Furthermore, a first air supply pipe, a second air supply pipe and a third air supply pipe are sequentially arranged on the side wall of the furnace body from bottom to top.
[0009] Furthermore, three first air supply pipes are arranged at intervals at the same height on one side wall of the furnace body, three second air supply pipes are arranged at intervals at the same height on one side wall of the furnace body, and three third air supply pipes are arranged at intervals at the same height on one side wall of the furnace body.
[0010] Furthermore, three first air supply pipes, three second air supply pipes and three third air supply pipes are arranged on the side walls of the furnace body that face each other.
[0011] Furthermore, the air inlet end of the wind hood is connected to an air supply main pipe, and the air supply main pipe is connected to a first air supply branch pipe and a second air supply branch pipe. The three first air supply pipes, three second air supply pipes and three third air supply pipes located on one side of the furnace body are all connected to the first air supply branch pipe, and the three first air supply pipes, three second air supply pipes and three third air supply pipes located on the other side of the furnace body are all connected to the second air supply branch pipe.
[0012] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0013] The ash conveying pipe conveys the purified ash to the bottom wall of the furnace chamber of the furnace body. The air conveyed to the inside of the furnace body by the blower through the hood ignites the charcoal and purified ash. The air conveyed to the inside of the furnace body is increased through the hood, so that the purified ash in the furnace chamber is blown up, and the purified ash begins to burn at the bottom of the furnace chamber of the furnace body. Since there are multiple air supply ducts on the side wall of the furnace body, the air supply volume of the hood is smaller than the conventional air volume, so that the purified ash cannot be fully burned during the initial combustion at the bottom of the furnace body, which can reduce the release of heat. When the purified ash rises to the side of the first air supply pipe, it contacts the primary combustion-supporting air conveyed by the first air supply pipe. At this time, the purified ash undergoes primary combustion. The purified ash fuel that is still not fully burned after the primary combustion continues to rise to the second air supply pipe. When the purified ash reaches one side of the tube, it contacts the secondary combustion-supporting air delivered by the second air supply pipe, and the purified ash completes the secondary combustion. After the secondary combustion, the purified ash that is still not fully burned continues to rise to the side of the third air supply pipe, where it contacts the air delivered by the third air supply pipe, and the purified ash undergoes tertiary combustion. The advantage of graded combustion is that a large amount of heat generated during the original primary combustion is decomposed into three stages, burned step by step, and the heat of each combustion chamber is reduced, which can reduce the melting of ash in the purified ash to a certain extent, thereby reducing the adverse effect on the life of the refractory material caused by the ash melting and sticking to the inner wall of the boiling furnace. In addition, while reducing the combustion temperature, the generation of nitrogen oxides will also be reduced due to the reduction in combustion temperature, which is beneficial to reducing the emission of polluting gases. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model.
[0015] In the attached picture:
[0016] Figure 1 This is a schematic diagram of the structure of Example 1 of the utility model.
[0017] Marks and corresponding parts names in the attached drawings:
[0018] 1. Furnace body; 2. Ash conveying pipe; 3. Air cap assembly; 4. First air supply pipe; 5. Second air supply pipe; 6. Third air supply pipe; 7. Main air supply pipe; 8. First air supply branch pipe; 9. Second air supply branch pipe. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in combination with the embodiments and drawings. The schematic implementation mode and description of the utility model are only used to explain the utility model and are not intended to limit the utility model. It should be noted that the utility model is already in the actual development and use stage.
[0020] Example 1
[0021] A fluidized bed furnace for low temperature incineration and purification of ash, Figure 1 , including a furnace body 1, an ash conveying pipe 2 is connected to the furnace body 1, a hood group 3 is arranged at the bottom of the furnace of the furnace body 1, and a plurality of air supply ducts are arranged on the side wall of the furnace body 1 at intervals along the height direction of the furnace body 1, one end of the plurality of air supply ducts is connected to the inside of the furnace body 1, and the other end is connected to the outside of the furnace body 1.
[0022] As a preferred embodiment, refer to Figure 1 A first air supply pipe 4, a second air supply pipe 5 and a third air supply pipe 6 are sequentially arranged on the side wall of the furnace body 1 from bottom to top.
[0023] As a preferred embodiment, refer to Figure 1 Three first air supply pipes 4 are arranged at intervals at the same height on one side wall of the furnace body 1, three second air supply pipes 5 are arranged at intervals at the same height on one side wall of the furnace body 1, and three third air supply pipes 6 are arranged at intervals at the same height on one side wall of the furnace body 1, so that each level of combustion-supporting air delivered to the inside of the furnace body 1 is evenly distributed.
[0024] As a preferred embodiment, refer to Figure 1 Three first air supply pipes 4, three second air supply pipes 5 and three third air supply pipes 6 are arranged on the side walls of the furnace body 1 facing each other.
[0025] As a preferred embodiment, refer to Figure 1The air inlet end of the hood is connected with an air supply main pipe 7, and the air supply main pipe 7 is connected with a first air supply branch pipe 8 and a second air supply branch pipe 9. The three first air supply pipes 4, the three second air supply pipes 5 and the three third air supply pipes 6 located on one side of the furnace body 1 are respectively connected with the first air supply branch pipe 8, and the three first air supply pipes 4, the three second air supply pipes 5 and the three third air supply pipes 6 located on the other side of the furnace body 1 are respectively connected with the second air supply branch pipe 9; the air inlet end of the air supply main pipe 7 is provided with a blower, and air is supplied to the hood and multiple air supply pipes through the blower. The air is transported by pipes; the blower distributes the air to the first air supply branch pipe 8 and the second air supply branch pipe 9 through the air supply main pipe 7, and the first air supply branch pipe 8 and the second air supply branch pipe 9 transport the air to multiple air supply pipes on the corresponding sides of the furnace body 1, and the multiple air supply pipes located at the same height of the furnace body 1 transport air into the furnace body 1, the six first air supply pipes 4 transport the first-level combustion-supporting air into the furnace body 1, the six second air supply pipes 5 transport the second-level combustion-supporting air into the furnace body 1, and the six third air supply pipes 6 transport the third-level combustion-supporting air into the furnace body 1.
[0026] The working principle of the scheme of this embodiment is as follows: the ash conveying pipe 2 conveys the purified ash to the bottom wall of the furnace chamber of the furnace body 1. The air conveyed to the inside of the furnace body 1 by the blower through the hood ignites the charcoal and the purified ash. The air conveyed to the inside of the furnace body 1 is increased through the hood, so that the purified ash in the furnace chamber is blown up, and the purified ash begins to burn at the bottom position of the furnace chamber of the furnace body 1. Since a plurality of air supply ducts are arranged on the side wall of the furnace body 1, the air supply volume of the hood group 3 is smaller than the conventional air volume, so that the purified ash cannot be fully burned during the initial combustion at the bottom of the furnace body 1, which can reduce the release of heat. When the purified ash rises to the side of the first air supply pipe 4, it contacts the primary combustion-supporting air conveyed by the first air supply pipe 4. At this time, the purified ash undergoes primary combustion. The purified ash that is still not fully burned after the primary combustion burns When the material continues to rise to the side of the second air supply pipe 5, it contacts the secondary combustion-supporting air delivered by the second air supply pipe 5, and the purified ash completes the secondary combustion. After the secondary combustion, the purified ash that is still not fully burned continues to rise to the side of the third air supply pipe 6, and contacts the air delivered by the third air supply pipe 6. At this time, the purified ash undergoes tertiary combustion. The advantage of graded combustion is that a large amount of heat generated during the original primary combustion is decomposed into three stages, burned step by step, and the heat of each combustion chamber is reduced. The melting of ash in the purified ash can be reduced to a certain extent, thereby reducing the adverse effect on the life of the refractory material caused by the ash melting and sticking to the inner wall of the boiling furnace. In addition, while reducing the combustion temperature, the reduction in combustion temperature will also reduce the generation of nitrogen oxides, which is beneficial to reducing the emission of pollutants.
[0027] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.
Claims
1. A fluidized bed furnace for low-temperature incineration and purification of ash, comprising a furnace body (1), an ash conveying pipe (2) being connected to the furnace body (1), and a hood group (3) being arranged at the bottom of the furnace chamber of the furnace body (1), characterized in that: A plurality of air supply ducts are arranged at intervals on the side wall of the furnace body (1) along the height direction of the furnace body (1); one end of the plurality of air supply ducts is connected to the interior of the furnace body (1), and the other end of the plurality of air supply ducts is connected to the exterior of the furnace body (1).
2. A fluidized bed furnace for low temperature incineration and purification of ash according to claim 1, characterized in that: A first air supply pipe (4), a second air supply pipe (5) and a third air supply pipe (6) are sequentially arranged on the side wall of the furnace body (1) from bottom to top.
3. A fluidized bed furnace for low temperature incineration and purification of ash according to claim 2, characterized in that: Three first air supply pipes (4) are arranged at intervals at the same height on one side wall of the furnace body (1), three second air supply pipes (5) are arranged at intervals at the same height on one side wall of the furnace body (1), and three third air supply pipes (6) are arranged at intervals at the same height on one side wall of the furnace body (1).
4. A fluidized bed furnace for low temperature incineration and purification of ash according to claim 3, characterized in that: Three first air supply pipes (4), three second air supply pipes (5) and three third air supply pipes (6) are arranged on the two side walls facing each other of the furnace body (1).
5. A fluidized bed furnace for low temperature incineration and purification of ash according to claim 4, characterized in that: The air inlet end of the hood is connected to an air supply main pipe (7), and the air supply main pipe (7) is connected to a first air supply branch pipe (8) and a second air supply branch pipe (9). The three first air supply pipes (4), the three second air supply pipes (5) and the three third air supply pipes (6) located on one side of the furnace body (1) are all connected to the first air supply branch pipe (8), and the three first air supply pipes (4), the three second air supply pipes (5) and the three third air supply pipes (6) located on the other side of the furnace body (1) are all connected to the second air supply branch pipe (9).