Novel waste heat recovery device of boiler

Abstract

The novel waste heat recovery device comprises a waste heat recovery structure, a high-temperature section, a medium-temperature section and a low-temperature section are arranged in the waste heat recovery structure, each section is provided with a high-temperature section maintenance door, a medium-temperature section maintenance door and a low-temperature section maintenance door which correspond to each other, and the three maintenance doors are fixed to the side face of the waste heat recovery structure through bolts. A waste residue collecting box is arranged below the filtering section, an exhaust pipe is arranged above the left side of the filtering section and the smoke inlet, and a drainage pipe is arranged below the right side of the waste heat recovery structure. The heat recovery rate can be improved through three-section temperature-dividing gradient heat exchange, three maintenance doors are arranged, all the modules are treated respectively, maintenance is more convenient, a filtering layer can be cleaned at regular time through a filtering section and a waste residue collecting box, and the situation that dust is enriched, and the working efficiency is affected is avoided.

Description

A novel waste heat recovery device for boilers Technical Field

[0001] This utility model belongs to the field of boiler waste heat recovery technology, specifically relating to a novel waste heat recovery device for boilers. Background Technology

[0002] When boilers burn fuel to generate heat, they typically emit high-temperature flue gas (above 200°C) or waste heat such as steam condensate. Directly releasing this waste heat into the environment results in energy waste. Waste heat recovery systems use technology to capture this heat and reuse it in the boiler itself or other processes, thereby improving overall energy efficiency. Using water tanks to transfer heat to the water can increase waste heat utilization by 20%–30%, a crucial aspect of industrial energy conservation and cost reduction. Because boilers emit high-temperature flue gas, the flue gas contains dust. Direct emission not only results in heat loss but also impacts the environment and human health. Therefore, waste heat recovery devices typically filter the flue gas. However, since the filter is located inside the recovery unit, cleaning is inconvenient, leading to clogging and affecting the recovery effect. Common waste heat recovery devices use water tanks for heat recovery, resulting in low heat recovery utilization rates.

[0003] In summary, existing technologies suffer from low heat recovery rates and inconvenient cleaning of filtration devices. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this utility model, to avoid obscuring the purpose of these documents, and such simplifications or omissions should not be used to limit the scope of this utility model.

[0005] Therefore, the purpose of this utility model is to provide a novel waste heat recovery device for boilers, which can solve the problems of low heat recovery rate and inconvenient cleaning of filter devices in existing technologies. This utility model provides a novel waste heat recovery device for boilers, comprising a waste heat recovery structure, which internally includes a high-temperature section, a medium-temperature section, and a low-temperature section. Each section has corresponding maintenance doors for the high-temperature section, the medium-temperature section, and the low-temperature section. The three maintenance doors are bolted to the side of the waste heat recovery structure and have internal rubber rings. A filter section is located to the left of the high-temperature section, below which is a waste residue collection box. The filter section is located to the left of the flue gas inlet. An exhaust pipe is located above the right side of the waste heat recovery structure, and a drain pipe is located below it.

[0006] Optionally, the filter section has a filter layer on the right side, which is a filter screen. The filter layer has a matching shovel block, which is connected to an air pump via a telescopic rod. The air pump is welded to the top of the filter section. The waste collection box is placed inside the outer shell of the waste collection box, which is welded to the bottom of the filter section. The opening on the top of the waste collection box outer shell is compatible with the shovel block. Rubber rings are provided on all four sides of the waste collection box, and handles are provided on the outside. The waste collection box and the waste collection box outer shell are compatible.

[0007] Optionally, the high-temperature section corresponding to the high-temperature section maintenance door is located on the right side of the filter section, and is equipped with a spiral radiation heat exchange tube bundle inside. The spiral radiation heat exchange tube bundle includes a spiral coil and a high emissivity ceramic coating sprayed on its surface. Other gaps outside the initial air inlet of the spiral radiation heat exchange tube bundle are filled with a phase energy storage unit, which is made of aluminum-silicon alloy.

[0008] Optionally, the medium-temperature section corresponding to the maintenance door is located to the right of the high-temperature section. From left to right, a serrated finned tube heat exchanger and an ultrasonic guide vane are respectively provided. The serrated finned tube heat exchanger is made of stainless steel with a nickel-phosphorus alloy plating on the surface. The ultrasonic guide vane is connected to the PLC and consists of the guide vane and an ultrasonic wind speed sensor array.

[0009] Optionally, the low-temperature section corresponding to the low-temperature section maintenance door is located to the right of the medium-temperature section, including an upper porous medium condenser and a lower guide block. One side of the guide block is connected to the ultrasonic guide vane, and the other side is connected to the bottom of the drain pipe.

[0010] Optionally, the porous medium condenser is a sintered copper fiber porous layer with a surface coated with a graphene-fumed silica hydrophilic-hydrophobic composite coating.

[0011] Optionally, the exhaust pipe is provided with an activated carbon filter layer.

[0012] Optionally, the air pump is connected to the PLC.

[0013] Optionally, the drain pipe, exhaust pipe, and smoke inlet are all equipped with sealing blocks.

[0014] In summary, this utility model has at least one of the following beneficial effects:

[0015] (1) This utility model can improve the heat recovery rate through three-stage temperature gradient heat exchange, and set three maintenance doors to handle each module separately, making maintenance more convenient. The filter section and waste collection box can clean the filter layer regularly to avoid dust accumulation and affect work efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 is a front view of a novel waste heat recovery device for boilers according to this utility model;

[0018] Figure 2 is a schematic diagram of the internal structure of a novel waste heat recovery device for boilers according to this utility model.

[0019] Figure 3 is a schematic cross-sectional view of the high-temperature collection layer of a novel waste heat recovery device for boilers according to this utility model;

[0020] List of symbols in the attached diagram: 1. Smoke inlet; 2. Waste residue collection box shell; 3. Waste heat recovery structure; 4. High-temperature section maintenance door; 5. Medium-temperature section maintenance door; 6. Low-temperature section maintenance door; 7. Exhaust pipe; 8. Handle; 9. Stabilizing foot; 10. Drain pipe; 11. Air pump; 12. Waste residue collection box; 13. Filter layer; 14. Shovel block; 15. Telescopic rod; 16. Spiral radiant heat exchanger tube bundle; 17. Serrated finned tube heat exchanger; 18. Ultrasonic guide vane; 19. Porous medium condenser; 20. Guide block; 21. Vent hole; 22. Phase change energy storage unit. Detailed Implementation Methods

[0021] The present invention will now be described in further detail with reference to Figures 1-3.

[0022] Example 1, referring to Figures 1-3, addresses the problems of low heat recovery rate and inconvenient cleaning of filter devices in existing waste heat recovery devices. This utility model discloses a novel waste heat recovery device for boilers, including a waste heat recovery structure 3. A stabilizing foot 9 is located at the bottom of the waste heat recovery structure 3. The waste heat recovery structure 3 is internally divided into a high-temperature section, a medium-temperature section, and a low-temperature section. Each section has a corresponding maintenance door 4 for the high-temperature section, a maintenance door 5 for the medium-temperature section, and a maintenance door 6 for the low-temperature section. The three maintenance doors are bolted to the side of the waste heat recovery structure 3 and have internal rubber rings. These doors allow for maintenance through which any module malfunctions, and the rubber rings reinforce the gaps, preventing flue gas from escaping through. The high-temperature section contains a spiral radiative heat exchange tube bundle 16, which includes spiral coils and a high-emissivity ceramic coating. All gaps in the spiral radiative heat exchange tube bundle 16, except for the vent 21, are filled with phase change energy storage units 22, which are made of aluminum-silicon alloy. When high-temperature flue gas flows through the spiral radiative heat exchange tube bundle 16, the spiral structure extends the flue gas path, and the ceramic coating improves the radiation efficiency to transfer heat to the phase change energy storage unit 22 for storage. When the load recovers, the phase change energy storage unit 22 will release heat.

[0023] The intermediate temperature section, from left to right, is equipped with a serrated finned tube heat exchanger 17 and ultrasonic guide vanes 18. The serrated finned tube heat exchanger 17 is made of stainless steel with a nickel-phosphorus alloy plating. The ultrasonic guide vanes 18 are connected to the PLC and consist of guide vanes and an array of ultrasonic wind speed sensors. The intermediate temperature section is a control layer. After the flue gas is cooled in the high-temperature section, it enters the intermediate temperature section. The serrated finned tube heat exchanger 17 increases the heat exchange area and promotes convection circulation to improve heat exchange efficiency. Then, the ultrasonic guide vanes 18 regulate the flow rate, causing the flue gas to flow evenly to the low-temperature section. The ultrasonic wind speed sensors transmit the detected data to the PLC, which adjusts the angle of the guide vanes according to the preset speed. This ensures stable flue gas delivery to the low-temperature section and avoids ash accumulation at low speeds or wear at high speeds.

[0024] The low-temperature section includes an upper porous media condenser 19 and a lower guide block 20. One side of the guide block 20 is connected to the ultrasonic guide vane 18, and the other side is connected to the bottom of the drain pipe 10. The porous media condenser 19 is a sintered copper fiber porous layer with a graphene-fumed silica hydrophilic-hydrophobic composite coating. The hydrophilic region of the fumed silica has a contact angle of 10°, and the hydrophobic region has a contact angle of 150°. The hydrophilic and hydrophobic regions of the fumed silica are alternately distributed. The gradient design of the coating can increase the condensation rate. When the flue gas cools down to about 120°C, water vapor will condense rapidly in the hydrophilic region of the fumed silica, releasing heat. The hydrophobic region accelerates liquid dripping. The porous media condenser 19 expands the condensation area through capillary action, accelerating latent heat recovery.

[0025] The high-temperature section has a filtration section on the left, with a waste collection box 12 below it. The left side of the filtration section and the flue gas inlet 1, the upper right side of the waste heat recovery structure 3, and the lower right side have an exhaust pipe 7 and a drain pipe 10. The filtration section has a filter layer 13 on the right side, with a matching shovel block 14. The shovel block 14 is connected to an air pump 11 via a telescopic rod 15. The air pump 11 is welded to the top of the filtration section. The waste collection box 12 is placed inside the waste collection box shell 2, which is welded to the bottom of the filtration section. The opening on the top of the waste collection box shell 2 matches the shovel block 14. Rubber rings are provided on all four sides of the waste collection box 12, and a handle 8 is provided on the outside. The waste collection box 12 and the waste collection box shell 2 are compatible. An activated carbon filter layer is installed inside the exhaust pipe 7. The air pump 11 is connected to a PLC. Sealing blocks are installed on the drain pipe 10, exhaust pipe 7, and flue gas inlet 1. The filter layer 13 performs preliminary filtration of the flue gas entering the device. The air pump 11 is connected to the PLC to process impurities on the filter layer 13 in real time to prevent them from accumulating on the filter layer 13 and affecting the performance. The waste collection box 12 is equipped with a rubber ring to prevent flue gas leakage. The exhaust pipe 7 is equipped with an activated carbon filter layer to further ensure that the exhaust gas does not pollute the environment or humans.

[0026] Specific implementation principle: When using this utility model, the flue gas first enters the filter layer 13 of this equipment to filter impurities. The high-temperature flue gas falls into the high-temperature section and comes into contact with the high-emissivity ceramic coating through the vent 21, transferring heat to the phase change energy storage unit 22 for storage. The remaining flue gas enters the medium-temperature section, where the heat exchange area is increased and convection circulation is promoted through the serrated finned tube heat exchanger 17 to improve heat exchange efficiency. The ultrasonic wind speed sensor detects the wind speed and transmits the data to the PLC. The PLC adjusts the angle of the guide vanes according to the preset speed. When the flue gas enters the low-temperature layer, because the porous medium condenser 19 is a sintered copper fiber porous layer with a surface coated with a graphene-vaporized silica hydrophilic-hydrophobic composite coating, water... The vapor will condense rapidly in the hydrophilic region of the fumed silica and accelerate liquid dripping in the hydrophobic region. The porous media condenser 19 expands the condensation area through capillary action, accelerating latent heat recovery. Excess gas can be discharged through the activated carbon filter layer of the exhaust pipe 7 above, and excess water can be discharged through the drain pipe 10. When the ultrasonic wind speed sensor detects that the wind speed has slowed down, the PLC will control the air pump 11 to move the telescopic rod 15 downward. The shovel block 14 will move the impurities on the filter layer 13 downward, push the impurities into the waste collection box 12 and then return to its original position. The operator only needs to clean the waste collection box 12 regularly. If a fault occurs, the faulty module can be identified and the problem can be addressed accordingly, making maintenance more convenient.

[0027] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A novel waste heat recovery device for boilers, characterized in that, It includes a waste heat recovery structure (3), which is equipped with a high temperature section, a medium temperature section and a low temperature section. Each section has a corresponding high temperature section maintenance door (4), a medium temperature section maintenance door (5) and a low temperature section maintenance door (6). The three maintenance doors are fixed to the side of the waste heat recovery structure (3) by bolts. There are rubber rings inside. The left side of the high temperature section is the filter section, and the bottom of the filter section is the waste residue collection box (12). The left side of the filter section is the smoke inlet (1). The upper right side of the waste heat recovery structure (3) is the exhaust pipe (7), and the lower right side is the drain pipe (10).

2. The novel waste heat recovery device for boilers according to claim 1, characterized in that, The filter section has a filter layer (13) on the right side. The filter layer (13) is a filter screen. The filter layer (13) has a matching shovel block (14). The shovel block (14) is connected to the air pump (11) through the telescopic rod (15). The air pump (11) is welded to the top of the filter section. The waste collection box (12) is placed inside the waste collection box shell (2). The waste collection box shell (2) is welded to the bottom of the filter section. The opening on the top of the waste collection box shell (2) is compatible with the shovel block (14). Rubber rings are provided on all four sides of the waste collection box (12). A handle (8) is provided on the outside. The waste collection box (12) and the waste collection box shell (2) are compatible.

3. The novel waste heat recovery device for boilers according to claim 1, characterized in that, The high-temperature section corresponding to the high-temperature section maintenance door (4) is located on the right side of the filter section. It is equipped with a spiral radiation heat exchange tube bundle (16). The spiral radiation heat exchange tube bundle (16) includes a spiral coil and a high emissivity ceramic coating sprayed on its surface. Except for the vent (21), the gaps in the spiral radiation heat exchange tube bundle (16) are filled with phase change energy storage units (22). The phase change energy storage units (22) are made of aluminum-silicon alloy.

4. A novel waste heat recovery device for boilers according to claim 1, characterized in that, The medium-temperature section of the maintenance door (5) is located to the right of the high-temperature section. From left to right, there are a serrated finned tube heat exchanger (17) and an ultrasonic guide vane (18). The serrated finned tube heat exchanger (17) is made of stainless steel with a nickel-phosphorus alloy plating on the surface. The ultrasonic guide vane (18) is connected to the PLC and consists of the guide vane and an ultrasonic wind speed sensor array.

5. A novel waste heat recovery device for boilers according to claim 4, characterized in that, The low-temperature section of the maintenance door (6) is located to the right of the medium-temperature section, including the upper porous medium condenser (19) and the lower guide block (20). One side of the guide block (20) is connected to the ultrasonic guide vane (18), and the other side is connected to the bottom of the drain pipe (10).

6. A novel waste heat recovery device for boilers according to claim 5, characterized in that, The porous medium condenser (19) is a sintered copper fiber porous layer with a surface coated with a graphene-vaporized silica hydrophilic-hydrophobic composite coating.

7. A novel waste heat recovery device for boilers according to claim 1, characterized in that, The exhaust pipe (7) is equipped with an activated carbon filter layer inside.

8. A novel waste heat recovery device for boilers according to claim 2, characterized in that, The air pump (11) is connected to the PLC.

9. A novel waste heat recovery device for boilers according to claim 1, characterized in that, The drain pipe (10), exhaust pipe (7) and smoke inlet (1) are all equipped with sealing blocks.

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