A lime kiln tail gas utilization waste heat boiler

Abstract

The application is suitable for the technical field of industrial production tail gas utilization, and provides a lime kiln tail gas utilization waste heat boiler, which comprises a rack, a furnace body fixedly connected to the rack, an inner bore body located in the furnace body and provided with a reserved space for tail gas flow between the inner bore body and the furnace body, and a heat exchange pipeline located between the inner bore body and the furnace body and comprising water inlet pipes and water outlet pipes fixedly connected to two sides of the furnace body respectively, wherein the water inlet pipes are arranged close to the bottom of the furnace body, the water outlet pipes are arranged close to the top of the furnace body, the water inlet pipes and the water outlet pipes are connected through a spiral pipe located between the inner bore body and the furnace body, and the outer diameter of the spiral pipe is smaller than the reserved space between the inner bore body and the furnace body. The inner bore body and the furnace body are fixedly connected with spiral flow guide vanes arranged along the spiral pipe. The waste heat boiler can significantly increase the time of tail gas retention, thereby improving the utilization rate of tail gas heat.

Description

Technical Field

[0001] This invention belongs to the field of industrial waste gas utilization technology, and particularly relates to a waste heat boiler for utilizing waste gas from lime kilns. Background Technology

[0002] A lime kiln is a traditional process for producing lime. In a lime kiln, materials such as limestone are heated to high temperatures, causing them to decompose into calcium oxide and carbon dioxide. This process is widely used in construction, metallurgy, chemical industry, and environmental protection.

[0003] Lime kilns produce a large amount of flue gas when burning lime. In addition to harmful substances that have no value, the flue gas also carries a lot of heat energy. Making good use of the heat of the flue gas can effectively reduce the overall energy consumption and meet the current needs of energy conservation. Therefore, waste heat boilers have emerged. Generally, waste heat boilers use the exhaust gas from combustion to heat water, and the hot water is then transported to other industrial production.

[0004] Existing waste heat boilers heat water through heat pipes. The exhaust gas flows directionally within the boiler body. The exhaust gas achieves its heating function when it comes into contact with the heat pipes. Generally, the contact time between the exhaust gas and the heat pipes is short, resulting in the exhaust gas being discharged as soon as it has any remaining heat, which leads to a lack of utilization efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a waste heat boiler for utilizing tail gas from lime kilns, aiming to solve the problems mentioned in the background art.

[0006] The present invention is implemented as follows: a waste heat boiler utilizing tail gas from a lime kiln includes a frame, a furnace body fixedly connected to the frame, and further includes:

[0007] The inner chamber is located inside the furnace body, and a reserved gap is provided between the inner chamber and the furnace body for the flow of exhaust gas. The furnace body and the inner chamber are connected by an annular sealing plate at the bottom of both. An exhaust gas inlet pipe is fixedly connected to the annular sealing plate. A furnace cover is detachably fixedly connected to the top of the furnace body, and an exhaust gas outlet pipe is fixedly connected to the furnace cover.

[0008] The heat exchange pipeline is located between the inner chamber and the furnace body. The heat exchange pipeline includes an inlet pipe and an outlet pipe that are fixedly connected to both sides of the furnace body. The inlet pipe is located near the bottom of the furnace body, and the outlet pipe is located near the top of the furnace body. The inlet pipe and the outlet pipe are connected by a spiral pipe located between the inner chamber and the furnace body. The outer diameter of the spiral pipe is smaller than the reserved gap between the inner chamber and the furnace body.

[0009] A spiral guide vane is fixedly connected between the inner chamber and the furnace body. The spiral guide vane is arranged along the spiral tube, and the inner side of the spiral guide vane is in contact with the surface of the inner chamber, while the outer side of the spiral guide vane is in contact with the inner wall of the furnace body.

[0010] Preferably, the bottom of the inner cavity is an open structure, and the top of the inner cavity is provided with a sealing assembly facing the furnace cover. A cavity is rotatably arranged inside the inner cavity, and the outer surface of the cavity is in contact with the inner wall of the inner cavity. The top of the cavity is located outside the inner cavity, and a mounting bracket facing the outside of the cavity is fixedly connected to the bottom of the cavity. A soot blower is fixedly arranged on the mounting bracket, and the output end of the soot blower is connected to the wall through a straight pipe. Multiple first air inlets are opened on the cavity, and multiple second air inlets are opened on the inner cavity. The positions of the first air inlets and the second air inlets correspond to each other. A drive assembly connected to the mounting bracket is provided on the frame. The drive assembly is used to drive the mounting bracket and the cavity to rotate, so that the first air inlets and the second air inlets are aligned or staggered.

[0011] Preferably, the furnace cover body has a semi-circular structure, and multiple vertically arranged vertical rods are fixedly connected to the cover assembly. An installation ring is fixedly connected to the top of the vertical rod, the installation ring is in contact with the inner wall of the furnace cover body, and a filter screen is fixedly installed inside the installation ring.

[0012] Preferably, the sealing assembly includes a conical ash hopper fixedly connected to the top of the inner cavity, the diameter of the mounting ring is smaller than the diameter of the inner cavity, and a material leakage pipe located in the cavity and vertically arranged is fixedly connected to the bottom of the conical ash hopper. A circular hole is opened at the bottom of the cavity, and a connecting ring rotatably arranged at the bottom of the material leakage pipe is fixedly connected in the circular hole.

[0013] Preferably, a receiving box is fixedly connected to the bottom of the discharge pipe, and a switch door is provided on one side of the receiving box.

[0014] Preferably, the frame includes side frames located on both sides of the furnace body, and horizontally arranged crossbars are fixedly connected between the side frames. Multiple reinforcing plates connected to the side frames and crossbars are fixedly connected to the outside of the furnace body. The drive assembly is located on the side frames, and the mounting bracket is located between the two side frames.

[0015] Preferably, the drive assembly includes a shaft fixedly connected to the mounting bracket and a telescopic member rotatably connected to the side frame, with the other end of the telescopic member rotatably connected to the shaft.

[0016] Preferably, multiple structural reinforcements are provided at the connection between the furnace cover and the furnace body.

[0017] The waste heat boiler for utilizing tail gas from a lime kiln provided in this invention has the following advantages: During use, the tail gas flows within the furnace body through the tail gas inlet pipe and the tail gas outlet pipe. During this process, the tail gas comes into contact with the spiral tube, thereby heating the water inside the spiral tube. The longer contact time between the spiral tube and the tail gas improves heat utilization. Furthermore, the presence of spiral guide vanes allows the tail gas to flow along the spiral tube, significantly increasing the contact time between the tail gas and the spiral tube, further enhancing heat utilization. Therefore, this waste heat boiler significantly increases the tail gas retention time, thereby improving the utilization rate of tail gas heat, resulting in good practical performance. Attached Figure Description

[0018] Figure 1 A front view of a waste heat boiler utilizing tail gas from a lime kiln, provided as an embodiment of the present invention;

[0019] Figure 2 A three-dimensional structural diagram of a waste heat boiler utilizing tail gas from a lime kiln, provided for an embodiment of the present invention;

[0020] Figure 3 This is an internal structural diagram of the furnace body provided in an embodiment of the present invention;

[0021] Figure 4 This is a three-dimensional schematic diagram of the internal structure of the furnace body provided in an embodiment of the present invention;

[0022] Figure 5 This is a three-dimensional schematic diagram of the spiral guide vane and cavity provided in an embodiment of the present invention;

[0023] In the attached diagram: 1-Frame; 101-Side frame; 102-Horizontal bar; 103-Reinforcing plate; 2-Furnace body; 3-Inner chamber; 4-Annular sealing plate; 5-Tail gas inlet pipe; 6-Furnace cover; 7-Tail gas outlet pipe; 8-Heat exchange pipeline; 801-Water inlet pipe; 802-Water outlet pipe; 803-Spiral pipe; 9-Spiral guide vane; 10-Structural reinforcement; 11-Sealing assembly; 1101-Conical ash hopper; 12-Cavity; 13-Mounting bracket; 14-Soot blower; 15-Straight pipe; 16-First air inlet; 17-Second air inlet; 18-Drive assembly; 1801-Shaft; 1802-Telescopic component; 19-Vertical bar; 20-Mounting ring; 21-Filter screen; 22-Material leakage pipe; 23-Connecting ring; 24-Receiving box; 25-Opening and closing door. Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0026] like Figure 1 , Figure 3 , Figure 4 and Figure 5 The diagram shown illustrates the structure of a waste heat boiler utilizing tail gas from a lime kiln, as provided in an embodiment of the present invention. The boiler includes:

[0027] Frame 1, on which furnace body 2 is fixedly connected, also includes:

[0028] The inner chamber 3 is located inside the furnace body 2, and a reserved gap is provided between the inner chamber 3 and the furnace body 2 for the flow of exhaust gas. The furnace body 2 and the inner chamber 3 are connected by an annular sealing plate 4 located at the bottom of both. An exhaust gas inlet pipe 5 is fixedly connected to the annular sealing plate 4. A furnace cover 6 is detachably fixedly connected to the top of the furnace body 2, and an exhaust gas outlet pipe 7 is fixedly connected to the furnace cover 6.

[0029] The heat exchange pipeline 8 is located between the inner chamber 3 and the furnace body 2. The heat exchange pipeline 8 includes an inlet pipe 801 and an outlet pipe 802, which are respectively fixedly connected to both sides of the furnace body 2. The inlet pipe 801 is located near the bottom of the furnace body 2, and the outlet pipe 802 is located near the top of the furnace body 2. The inlet pipe 801 and the outlet pipe 802 are connected by a spiral pipe 803 located between the inner chamber 3 and the furnace body 2. The outer diameter of the spiral pipe 803 is smaller than the reserved gap between the inner chamber 3 and the furnace body 2.

[0030] A spiral guide vane 9 is fixedly connected between the inner chamber 3 and the furnace body 2. The spiral guide vane 9 is arranged along the spiral tube 803, and the inner side of the spiral guide vane 9 is in contact with the surface of the inner chamber 3, while the outer side of the spiral guide vane 9 is in contact with the inner wall of the furnace body 2.

[0031] In one embodiment of the present invention, during use, the exhaust gas can flow within the furnace body 2 through the exhaust gas inlet pipe 5 and the exhaust gas outlet pipe 7. During this process, the exhaust gas comes into contact with the spiral tube 803, thereby heating the water inside the spiral tube 803. The longer contact time between the spiral tube 803 and the exhaust gas improves the heat utilization rate. Furthermore, due to the presence of the spiral guide vane 9, the exhaust gas can flow along the spiral tube 803, significantly increasing the contact time between the exhaust gas and the spiral tube 803, thereby further increasing the heat utilization rate. Therefore, this waste heat boiler can significantly increase the retention time of the exhaust gas, thereby improving the utilization rate of the exhaust gas heat, and the actual use effect is good.

[0032] In one example of the present invention, such as Figure 2As shown, a plurality of structural reinforcing members 10 are provided at the connection between the furnace cover 6 and the furnace body 2. The structural reinforcing members 10 can be connected by bolts, which can tightly connect the furnace cover 6 and the furnace body 2, and is also convenient to disassemble.

[0033] like Figure 1 , Figure 2 and Figure 3 As shown, in a preferred embodiment of the present invention, the bottom of the inner cavity 3 is an open structure, and the top of the inner cavity 3 is provided with a sealing assembly 11 facing the furnace cover 6. A cavity 12 is rotatably arranged inside the inner cavity 3, and the outer surface of the cavity 12 is in contact with the inner wall of the inner cavity 3. The top of the cavity 12 is located outside the inner cavity 3. A mounting bracket 13 facing the outside of the cavity 12 is fixedly connected to the bottom of the cavity 12. A soot blower 14 is fixedly arranged on the mounting bracket 13. The output end of the soot blower 14 is connected to the wall through a straight pipe 15. A plurality of first air inlets 16 are opened on the cavity 12, and a plurality of second air inlets 17 are opened on the inner cavity 3. The positions of the first air inlets 16 and the second air inlets 17 are corresponding. A drive assembly 18 connected to the mounting bracket 13 is provided on the frame 1. The drive assembly 18 is used to drive the mounting bracket 13 and the cavity 12 to rotate, so that the first air inlets 16 and the second air inlets 17 are aligned or staggered.

[0034] In one embodiment, the frame 1 includes side frames 101 located on both sides of the furnace body 2, with transverse crossbars 102 fixedly connected between the side frames 101. Multiple reinforcing plates 103, connected to the side frames 101 and crossbars 102, are fixedly connected to the outside of the furnace body 2. The drive assembly 18 is located on the side frames 101, and the mounting frame 13 is located between the two side frames 101. The drive assembly 18 includes a shaft 1801 fixedly connected to the mounting frame 13, and a telescopic member 1802 rotatably connected to the side frames 101. The other end of the telescopic member 1802 is rotatably connected to the shaft 1801. The 1802 telescopic rod can be either electrically or hydraulically operated. When the telescopic rod 1802 operates, it changes the position of the mounting bracket 13, causing the cavity 12 to rotate within the inner chamber 3. When the first air inlet 16 aligns with the second air inlet 17, the soot blower 14 operates, blowing air into the furnace body 2 through the first and second air inlets 16 and 17, thus achieving the purpose of soot blowing. Due to the characteristics of lime kiln firing, the exhaust gas contains a significant amount of lime powder. Lime powder adhering to the inside of the waste heat boiler affects heat exchange efficiency, and soot blowing can solve this problem. Figure 3As shown, the furnace cover 6 has a semi-circular structure. Multiple vertically arranged vertical rods 19 are fixedly connected to the cover assembly 11. An installation ring 20 is fixedly connected to the top of the vertical rod 19. The installation ring 20 is in contact with the inner wall of the furnace cover 6. A filter screen 21 is fixedly installed inside the installation ring 20. The filter screen 21 can block dust in the exhaust gas. Since the furnace cover 6 can be disassembled, it is also convenient to clean the filter screen 21.

[0035] like Figure 3 and Figure 5 As shown, in a preferred embodiment of the present invention, the sealing assembly 11 includes a conical ash hopper 1101 fixedly connected to the top of the inner body 3. The diameter of the mounting ring 20 is smaller than the diameter of the inner body 3. A material leakage pipe 22 located inside the cavity 12 and vertically arranged is fixedly connected to the bottom of the conical ash hopper 1101. A circular hole is opened at the bottom of the cavity 12, and a connecting ring 23 rotatably arranged at the bottom of the material leakage pipe 22 is fixedly connected inside the circular hole.

[0036] In one embodiment, due to the presence of the filter screen 21, dust adheres to the bottom of the filter screen 21. Since exhaust gas is constantly flowing inside the furnace body 2, the dust will not fall off. However, with the above structure, when the waste heat boiler is shut down, the dust on the filter screen 21 will automatically fall into the conical ash hopper 1101, and then the dust will be discharged into the material leakage pipe 22. The bottom of the material leakage pipe 22 is fixedly connected to the receiving box 24, and a switch door 25 is provided on one side of the receiving box 24. The collected dust will be concentrated in the receiving box 24, and can be taken out after opening the switch door 25. The above structure can realize the periodic collection of dust in the furnace body 2, reduce the frequency of cleaning, and enable the waste heat boiler to maintain long-term heat exchange efficiency.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A waste heat boiler utilizing tail gas from a lime kiln, comprising a frame, with a furnace body fixedly connected to the frame, characterized in that... Also includes: The inner chamber is located inside the furnace body, and a reserved gap is provided between the inner chamber and the furnace body for the flow of exhaust gas. The furnace body and the inner chamber are connected by an annular sealing plate at the bottom of both. An exhaust gas inlet pipe is fixedly connected to the annular sealing plate. A furnace cover is detachably fixedly connected to the top of the furnace body, and an exhaust gas outlet pipe is fixedly connected to the furnace cover. The heat exchange pipeline is located between the inner chamber and the furnace body. The heat exchange pipeline includes an inlet pipe and an outlet pipe that are fixedly connected to both sides of the furnace body. The inlet pipe is located near the bottom of the furnace body, and the outlet pipe is located near the top of the furnace body. The inlet pipe and the outlet pipe are connected by a spiral pipe located between the inner chamber and the furnace body. The outer diameter of the spiral pipe is smaller than the reserved gap between the inner chamber and the furnace body. A spiral guide vane is fixedly connected between the inner cavity and the furnace body. The spiral guide vane is arranged along the spiral tube, and the inner side of the spiral guide vane is in contact with the surface of the inner cavity, while the outer side of the spiral guide vane is in contact with the inner wall of the furnace body. The bottom of the inner cavity is an open structure, and the top of the inner cavity is provided with a sealing assembly facing the furnace cover. A cavity is rotatably arranged inside the inner cavity, and the outer surface of the cavity is in contact with the inner wall of the inner cavity. The top of the cavity is located outside the inner cavity. A mounting bracket facing the outside of the cavity is fixedly connected to the bottom of the cavity. A soot blower is fixedly arranged on the mounting bracket. The output end of the soot blower is connected to the wall through a straight pipe. Multiple first air inlets are opened on the cavity, and multiple second air inlets are opened on the inner cavity. The positions of the first air inlets and the second air inlets correspond to each other. A drive assembly connected to the mounting bracket is provided on the frame. The drive assembly is used to drive the mounting bracket and the cavity to rotate, so that the first air inlets and the second air inlets are aligned or staggered. The furnace cover body has a semi-circular structure. Multiple vertically arranged vertical rods are fixedly connected to the cover assembly. An installation ring is fixedly connected to the top of the vertical rod. The installation ring contacts the inner wall of the furnace cover body. A filter screen is fixedly installed inside the installation ring. The sealing assembly includes a conical ash hopper fixedly connected to the top of the inner cavity. The diameter of the mounting ring is smaller than the diameter of the inner cavity. A material leakage pipe located in the cavity and vertically arranged is fixedly connected to the bottom of the conical ash hopper. A circular hole is opened at the bottom of the cavity, and a connecting ring rotatably arranged at the bottom of the material leakage pipe is fixedly connected in the circular hole. The bottom of the material leakage pipe is fixedly connected to a receiving box, and a switch door is provided on one side of the receiving box.

2. The waste heat boiler utilizing tail gas from lime kilns according to claim 1, characterized in that, The frame includes side frames located on both sides of the furnace body, with horizontally arranged crossbars fixedly connected between the side frames. Multiple reinforcing plates connected to the side frames and crossbars are fixedly connected to the outside of the furnace body. The drive assembly is located on the side frames, and the mounting bracket is located between the two side frames.

3. The waste heat boiler utilizing tail gas from a lime kiln according to claim 2, characterized in that, The drive assembly includes a shaft fixedly connected to the mounting bracket and a telescopic component rotatably connected to the side frame, with the other end of the telescopic component rotatably connected to the shaft.

4. The waste heat boiler utilizing tail gas from a lime kiln according to claim 1, characterized in that, The connection between the furnace cover and the furnace body is provided with multiple structural reinforcements.

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