Boiler waste heat recycling device for low-nitrogen energy-saving combustion
By adopting a threaded pipe structure and a cleaning brush design controlled by a three-way valve in the boiler waste heat recovery device, the problems of low heat exchange efficiency and inconvenient pipe cleaning in traditional devices are solved, achieving efficient waste heat recovery and stable equipment operation.
Patent Information
- Application Number
- CN202423079015.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-13
AI Technical Summary
In existing boiler waste heat recovery devices, the contact area of traditional heat exchange tubes is limited, resulting in low heat exchange efficiency. This makes it difficult to achieve efficient waste heat recovery, especially under conditions of high exhaust gas velocity or large temperature changes.
The recovery assembly, which uses a threaded tube structure, increases the contact area between exhaust gas and cold air. A three-way valve controls the flow of high-pressure water to drive a cleaning brush to clean the inner wall of the pipe, improving heat exchange efficiency and convenience.
It improves the efficiency of waste heat recovery, solves the problem of insufficient utilization of waste heat in traditional devices, and facilitates the cleaning of the inner wall of the pipeline, ensuring long-term efficient operation of the equipment.
Smart Images
Figure CN223678274U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of boiler waste heat recovery, especially to the low nitrogen energy -conserving combustion boiler waste heat recycling device. BACKGROUND
[0002] The boiler waste heat recycling device is a device for recycling and utilizing waste heat (waste heat) generated during the operation of a boiler. When a boiler is working, it will generate high-temperature flue gas, steam or hot water, which contains a large amount of heat energy that has not been fully utilized. If it is directly discharged, not only will it cause energy waste, but it may also cause thermal pollution to the environment. In order to recycle this waste heat and convert it into usable heat energy or electrical energy for heating, heating or industrial production, thereby further improving the overall thermal efficiency of the boiler, a low-nitrogen energy-saving combustion boiler waste heat recycling device is needed.
[0003] The low-nitrogen energy-saving combustion boiler waste heat recycling device can be divided into various types, including waste heat recovery steam generators, flue gas waste heat recovery devices and air preheaters, etc. These waste heat recycling devices can be used alone or combined according to requirements to achieve energy saving and environmental protection goals under different working conditions. The waste heat recovery steam generator converts the high-temperature flue gas discharged by the boiler into steam, and uses a heat exchanger to transfer the flue gas waste heat to water to generate steam.
[0004] However, the existing boiler waste heat recycling device still has obvious deficiencies in actual application. For example, most of the traditional heat exchange pipes use straight pipes or single structure forms, which have limited contact area with exhaust gas, resulting in low heat exchange efficiency. Especially in the working condition where the exhaust gas flow rate is fast or the temperature changes greatly, it is difficult to achieve efficient heat energy recovery, resulting in that the waste heat resources discharged by the boiler cannot be fully utilized. Therefore, how to optimize the structure of the heat exchange pipe and further improve the waste heat recovery efficiency has become a problem to be solved in the existing technology. UTILITY MODEL CONTENTS
[0005] In order to make up for the above shortcomings, the utility model provides a low-nitrogen energy-saving combustion boiler waste heat recycling device, which aims to improve the problem that the boiler waste heat recycling device only contacts exhaust gas for heat absorption through a single heat exchange pipe, resulting in low waste heat recovery efficiency.
[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: the low-nitrogen energy-saving combustion boiler waste heat recycling device comprises a tank body, an air inlet pipe two and an air outlet pipe two are fixedly connected inside the tank body, a supporting assembly is arranged inside the tank body, and a recycling assembly is arranged inside the tank body.
[0007] The recovery assembly comprises a threaded pipe, a left shell fixedly connected to one end of the threaded pipe, a gas inlet pipe one fixedly connected to the inside of the left shell, a right shell fixedly connected to the other end of the threaded pipe, a gas outlet pipe one fixedly connected to the inside of the right shell, and the threaded pipe being fixedly connected in an annular array inside the right shell.
[0008] Moreover, the support assembly comprises a support fixedly connected to the inside of the tank body, and the threaded pipe is arranged in the support.
[0009] Moreover, the gas outlet pipe two is fixedly connected with a support rod inside, and the support rod is fixedly connected with a limiting column inside.
[0010] Moreover, the limiting column is slidably connected with a sliding block outside, and the sliding block is fixedly connected with a cleaning brush.
[0011] Moreover, the gas outlet pipe two is fixedly connected with an annular pipe inside, and the annular pipe is fixedly connected with a nozzle outside.
[0012] Moreover, the annular pipe is fixedly connected with a connecting pipe outside, and the connecting pipe is fixedly connected with a three-way valve outside.
[0013] Moreover, the cleaning brush is attached to the inner wall of the gas outlet pipe two.
[0014] The advantages and positive effects of the present application are as follows:
[0015] 1. In the present application, the exhaust gas first contacts the outer wall of the threaded pipe, and then the cold air absorbs the waste heat in the exhaust gas through the threaded pipe to warm up the cold air. Since the threaded pipe is threaded, the contact area with the exhaust gas is increased, thereby improving the waste heat recovery efficiency. The problem of low waste heat recovery efficiency caused by the single heat exchange pipe contacting the exhaust gas for heat absorption in the boiler waste heat recycling device is solved, and the waste heat recovery efficiency of the boiler waste heat recycling device is improved.
[0016] 2. In the present application, the three-way valve is connected to the left connecting pipe, high-pressure water enters the left annular pipe through the connecting pipe and is sprayed out from the nozzle, thereby driving the cleaning brush to move outside the limiting column, and the cleaning brush cleans the inner wall of the gas outlet pipe two. The effect of facilitating the cleaning of the inner wall of the pipeline is achieved, the problem of dirt accumulation on the inner wall of the exhaust gas pipeline, which makes cleaning inconvenient, is solved, and the convenience of the boiler waste heat recycling device is improved. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 The present application provides a three-dimensional view of a low-nitrogen energy-saving combustion boiler waste heat recycling device;
[0018] Figure 2 The present application provides a tank body internal structure schematic diagram of a low-nitrogen energy-saving combustion boiler waste heat recycling device;
[0019] Figure 3 The threaded pipe structure schematic view of the low-nitrogen energy-saving combustion boiler waste heat recycling device provided by the present application is shown in the figure.
[0020] Figure 4 The internal structure schematic view of the gas outlet pipe two of the low-nitrogen energy-saving combustion boiler waste heat recycling device provided by the present application is shown in the figure.
[0021] Legend:
[0022] 1, tank body; 2, air inlet pipe one; 3, air outlet pipe one; 4, air inlet pipe two; 5, air outlet pipe two; 6, left shell; 7, threaded pipe; 8, right shell; 9, support; 10, support rod; 11, limit column; 12, sliding block; 13, cleaning brush; 14, annular pipe; 15, nozzle; 16, connecting pipe; 17, three-way valve. DETAILED DESCRIPTION
[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.
[0024] With reference to Figures 1-3 The present application provides an embodiment: a low-nitrogen energy-saving combustion boiler waste heat recycling device, which comprises a tank body 1, the tank body 1 is internally fixedly connected with an air inlet pipe two 4 and an air outlet pipe two 5, the air inlet pipe two 4 is used for introducing waste gas, the air outlet pipe two 5 is used for discharging waste gas after heat exchange, so as to ensure smooth flow of the waste gas, the tank body 1 is internally provided with a support assembly for fixing and supporting a recycling assembly, the tank body 1 is internally provided with a recycling assembly for recycling and utilizing waste heat.
[0025] The recycling assembly includes a threaded pipe 7 for heat exchange between water and exhaust gas, the threaded structure of which increases the contact area with the exhaust gas and improves the heat exchange efficiency. One end of the threaded pipe 7 is fixedly connected with the left shell 6, and the inside of the left shell 6 is fixedly connected with the air inlet pipe 2, which is used to introduce cooling water into the device to supply circulating water. The other end of the threaded pipe 7 is fixedly connected with the right shell 8, and the inside of the right shell 8 is fixedly connected with the air outlet pipe 3, which is used to discharge water after absorbing waste heat to realize the recycling of hot water. The threaded pipes 7 are fixedly connected in a ring array inside the right shell 8, which further improves the overall heat exchange area of the threaded pipes 7 and enhances the heat exchange effect. The support assembly includes a bracket 9 fixedly connected to the inside of the tank body 1 for stabilizing the recycling assembly and ensuring its stability in the device. The threaded pipes 7 are arranged inside the bracket 9, which can maintain appropriate stress and position during heat exchange to avoid deviation or damage caused by exhaust gas flow and ensure long-term stable operation of the device.
[0026] Specifically, after the water source is introduced into the internal space of the left shell 6 through the air inlet pipe 2, it quickly enters the threaded pipe 7 after a short flow. Then, the water source further flows to the right shell 8 through the threaded pipe 7, while the exhaust gas is introduced into the internal cavity of the tank body 1 through the air inlet pipe 2. After entering the tank body 1, the exhaust gas fully contacts the outer wall of the threaded pipe 7, and the outer wall of the threaded pipe 7 significantly increases the contact surface area with the exhaust gas through its unique threaded design, thereby enhancing the efficiency of heat exchange. The water in the threaded pipe 7 can efficiently absorb the waste heat in the exhaust gas, and the water temperature gradually rises. The heated exhaust gas is smoothly discharged from the system through the air outlet pipe 5, avoiding the influence of exhaust gas residue on the equipment. At the same time, the heated water flows out through the channel inside the right shell 8 and is transported to the downstream use scene through the air outlet pipe 1. In order to ensure the stability of the threaded pipe 7 in the tank body 1, it is firmly supported and fixed by the bracket 9. This structural design not only improves the overall stability of the device, but also effectively guarantees the efficiency and continuity of the waste heat recovery process, thereby realizing the full recovery and utilization of waste heat.
[0027] Referring to Figure 4The support rod 10 is internally fixedly connected with the limiting column 11, the limiting column 11 is used for limiting the sliding range of the sliding block 12, and the operation precision and stability of the cleaning structure are guaranteed, the limiting column 11 is slidably connected with the sliding block 12, the sliding block 12 moves the cleaning brush 13 in the exhaust pipe two 5 through sliding, and the cleaning coverage range and effect are enhanced. The sliding block 12 is fixedly connected with the cleaning brush 13, the cleaning brush 13 is attached to the inner wall of the exhaust pipe two 5, the cleaning brush 13 is used for brushing the inner wall of the exhaust pipe two 5, the adhering matters and dirt on the inner wall can be effectively removed through the sliding of the sliding block 12, the exhaust pipe two 5 is internally fixedly connected with the annular pipe 14, the annular pipe 14 is used for guiding uniform distribution of cleaning liquid, and the cleaning efficiency is enhanced, the annular pipe 14 is fixedly connected with the nozzle 15, the nozzle 15 is used for spraying high-pressure water flow, so that the inner wall of the exhaust pipe two 5 is flushed, and the brushing effect of the cleaning brush 13 is further assisted. The annular pipe 14 is fixedly connected with the connecting pipe 16, the connecting pipe 16 is used for connecting the annular pipe 14 and the cleaning liquid conveying system, and the continuous supply of cleaning liquid is guaranteed, the connecting pipe 16 is fixedly connected with the three-way valve 17, the three-way valve 17 is used for controlling the flow direction of the cleaning liquid, and the reciprocating movement of the cleaning brush 13 can be realized through switching the flow direction, and the comprehensive cleaning of the inner wall of the exhaust pipe two 5 is guaranteed.
[0028] Specifically, when the inner wall of the exhaust pipe two 5 is cleaned, high-pressure water is first introduced into the connecting pipe 16 through the three-way valve 17, according to the requirement of the cleaning position, the three-way valve 17 is controlled to connect the passage of the left connecting pipe 16. The high-pressure water flows through the left connecting pipe 16 and quickly enters the inside of the annular pipe 14, and is sprayed out through the evenly distributed nozzles 15 on the annular pipe 14, forming a high-pressure water flow. In this process, the sprayed high-pressure water not only has a cleaning effect on the inner wall of the exhaust pipe two 5, but also drives the cleaning brush 13 to move linearly along the outer wall of the limiting column 11. While the cleaning brush 13 moves, the adhering matters on the inner wall of the exhaust pipe two 5 are efficiently removed by the bristles of the cleaning brush 13. When the cleaning brush 13 moves to the right cleaning limit, the three-way valve 17 is switched to close the left valve and connect the right connecting pipe 16. After the high-pressure water flow reenters the right connecting pipe 16, the cleaning brush 13 is driven to return in the opposite direction, and the cleaning work on the other side is continued. Through the reciprocating movement design, the cleaning brush 13 can realize the comprehensive cleaning of the inner wall of the exhaust pipe two 5, and the whole process does not need to disassemble the pipeline structure, greatly improving the operation convenience, and ensuring the cleanliness of the inner wall of the exhaust pipe two 5, thereby ensuring the long-term efficient operation of the equipment.
[0029] Working principle: when using the low-nitrogen energy-saving boiler waste heat recycling device, first, cold air enters the left shell 6 through the air inlet pipe 1, then the cold air enters the right shell 8 through the threaded pipe 7, and the exhaust gas enters the tank body 1 through the air inlet pipe 2, the exhaust gas contacts the outer wall of the threaded pipe 7, and the water absorbs the waste heat in the exhaust gas through the threaded pipe 7 to warm the cold air, then the exhaust gas is discharged through the air outlet pipe 2, and the threaded pipe 7 is supported in the tank body 1 through the support 9, so as to improve the waste heat recovery efficiency, then when cleaning the air outlet pipe 2, high-pressure water is connected to the connecting pipe 16 through the three-way valve 17, first, the high-pressure water is connected to the left connecting pipe 16 through the control of the three-way valve 17, then the high-pressure water enters the left annular pipe 14 through the connecting pipe 16 and is sprayed from the nozzle 15, then the cleaning brush 13 is driven to move on the outer wall of the limiting column 11, and the inner wall of the air outlet pipe 2 is cleaned at the same time, when the cleaning brush 13 moves to the right side, the three-way valve 17 closes the left valve and connects the right connecting pipe 16, then the cleaning brush 13 is driven to move to the left side, so as to facilitate the cleaning of the inner wall of the pipeline.
[0030] Although the embodiments and drawings of the utility model are disclosed for the purpose of illustration, those skilled in the art can understand that various substitutions, changes and modifications are possible without departing from the spirit and scope of the utility model and the appended claims, therefore, the scope of the utility model is not limited to the disclosed content of the embodiments and drawings.
Claims
1. A boiler waste heat reuse device for low-nitrogen energy-saving combustion, comprising a tank body (1), characterized in that: The inside of the tank body (1) is fixedly connected with the air inlet pipe two (4) and the air outlet pipe two (5), the inside of the tank body (1) is provided with a supporting assembly, and the inside of the tank body (1) is provided with a recycling assembly; The recycling assembly comprises a threaded pipe (7), one end of the threaded pipe (7) is fixedly connected with a left shell (6), the inside of the left shell (6) is fixedly connected with an air inlet pipe one (2), the other end of the threaded pipe (7) is fixedly connected with a right shell (8), the inside of the right shell (8) is fixedly connected with an air outlet pipe one (3), and the threaded pipe (7) is fixedly connected in an annular array in the inside of the right shell (8).
2. The low-nitrogen energy-saving boiler waste heat recycling device according to claim 1, characterized in that: The supporting assembly comprises a support (9), the outer wall of the support (9) is fixedly connected in the inside of the tank body (1), and the threaded pipe (7) penetrates in the inside of the support (9).
3. The low-nitrogen energy-saving boiler waste heat recycling device according to claim 1, characterized in that: The inside of the air outlet pipe two (5) is fixedly connected with a supporting rod (10), and the inside of the supporting rod (10) is fixedly connected with a limiting column (11).
4. The low-nitrogen energy-saving boiler waste heat recycling device according to claim 3, characterized in that: The outer wall of the limiting column (11) is slidably connected with a sliding block (12), and the outer wall of the sliding block (12) is fixedly connected with a cleaning brush (13).
5. The low-nitrogen energy-saving boiler waste heat recycling device according to claim 1, characterized in that: The inside of the air outlet pipe two (5) is fixedly connected with an annular pipe (14), and the outer wall of the annular pipe (14) is fixedly connected with a nozzle (15).
6. The low-nitrogen energy-saving boiler waste heat recycling device according to claim 5, characterized in that: The outer wall of the annular pipe (14) is fixedly connected with a connecting pipe (16), and the outer wall of the connecting pipe (16) is fixedly connected with a three-way valve (17).
7. The low-nitrogen energy-saving boiler waste heat recycling device according to claim 4, characterized in that: The outer wall of the cleaning brush (13) is attached to the inner wall of the air outlet pipe two (5).