A waste heat recovery boiler and recovery method

Abstract

The application discloses a waste heat recovery boiler and a recovery method, and belongs to the technical field of waste gas treatment. The device comprises a boiler body. The main body of the boiler body is in a vertically arranged cylindrical structure. A first smoke inlet and a first smoke outlet are respectively arranged at the lower end and the upper end of the boiler body. A heat exchange cylinder is coaxially arranged at the inner side of the boiler body. A second smoke inlet and a second smoke outlet are respectively arranged at the lower end and the upper end of the heat exchange cylinder. A water pipe is coaxially arranged at the center of the heat exchange cylinder. An inlet water pipe and an outlet water pipe are respectively connected to the lower end and the upper end of the water pipe. A spiral large blade is arranged at the outer side of the lower part of the water pipe. A rotating cylinder is rotatably arranged at the upper part of the water pipe in the heat exchange cylinder. A spiral small blade is arranged on the inner wall of the rotating cylinder. A partition block is arranged at the inner side of the water pipe. A water outlet and a water inlet are arranged at the outer side of the rotating cylinder. The method can improve the utilization efficiency of the waste heat of flue gas.

Description

Technical Field

[0001] This invention belongs to the field of waste gas treatment technology, specifically relating to a waste heat recovery boiler and recovery method. Background Technology

[0002] In industrial production processes, large amounts of high-temperature flue gas are typically emitted directly, resulting in significant energy waste and exacerbating environmental thermal pollution. Waste heat recovery boilers are energy-saving devices designed to address this issue. However, existing waste heat recovery boilers still face a significant technical bottleneck in actual operation. When the flue gas flows too quickly within the boiler, although the amount of flue gas passing through the boiler per unit time increases, the velocity of the water flow tubes cannot keep up, leading to insufficient heat exchange and a decrease in the overall heat exchange efficiency of the boiler. This phenomenon is further exacerbated by load fluctuations or deviations from design conditions, causing heat to be insufficiently absorbed and directly discharged, wasting energy and potentially affecting subsequent flue gas treatment processes. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a waste heat recovery boiler and recovery method, which can improve the utilization efficiency of flue gas waste heat.

[0004] To achieve the above objectives, the present invention provides the following technical solution: This invention discloses a waste heat recovery boiler, comprising a boiler body, the main body of which is a vertically arranged cylindrical structure. A first flue gas inlet and a first flue gas outlet are respectively provided at the lower and upper ends of the boiler body. A heat exchange cylinder is coaxially mounted on the inner side of the boiler body. A second flue gas inlet and a second flue gas outlet are respectively provided at the lower and upper ends of the heat exchange cylinder. A water pipe is coaxially mounted at the center of the heat exchange cylinder. A water inlet pipe and a water outlet pipe are respectively connected to the lower and upper ends of the water pipe. A large spiral blade is installed on the lower outer side of the water pipe. A rotating cylinder is rotatably mounted inside the heat exchange cylinder at the upper part of the water pipe. Small spiral blades are installed on the inner wall of the rotating cylinder. A partition block is installed inside the water pipe. An outlet and a water inlet are provided on the outer side of the water pipe and inside the rotating cylinder. The positions of the outlet and inlet correspond to the positions of the water inlet and outlet pipes and are arranged on both sides of the partition block. The large spiral blade is connected to the rotating cylinder via a rotating disc.

[0005] Furthermore, multiple heat exchange plates are installed on the outer side of the rotating drum. The heat exchange plates are evenly spaced along the circumference of the rotating drum. Heat exchange channels are opened on the heat exchange plates, and the two openings of the heat exchange channels correspond to the positions of the water inlet and the water outlet, respectively.

[0006] Furthermore, the heat exchange plate includes an inner plate and an outer plate fixedly connected to the inner plate. The two channel openings of the heat exchange channel are opened on the inner plate and communicate with the inner side of the rotating cylinder. The inner plate and the outer plate are provided with strip grooves, and the strip grooves on the inner plate and the outer plate are combined to form a heat exchange channel.

[0007] Furthermore, the rotating disk is fixedly connected to the rotating cylinder, and the rotating disk rotates in conjunction with the inner wall of the heat exchange cylinder. A slot is provided on the rotating disk, and the large spiral blades are made of elastic material. A locking block that mates with the slot is fixed to the end face of the large spiral blades. An elastic support device is installed between the heat exchange cylinder and the heat exchange plate.

[0008] Furthermore, the elastic support device includes a spring and a rotating ring. One end of the spring is connected to the heat exchange cylinder, and the other end is connected to the rotating ring. The rotating ring is fitted into a groove in the heat exchange plate.

[0009] Furthermore, the center of the spiral blades forms a central hole through which the water supply pipe passes.

[0010] Furthermore, a filter plate is installed at the lower end of the heat exchange cylinder, and the filter plate is formed inside the second flue gas inlet.

[0011] Furthermore, multiple hollow tubes are installed on the outside of the heat exchange tubes. The axis of the hollow tubes is parallel to the axis of the boiler body. The two ends of the hollow tubes face the side where the first flue gas inlet and the first flue gas outlet are located, respectively. The hollow tubes are evenly distributed around the heat exchange tubes along the circumference. Electrically controlled valves are installed on the inside of the hollow tubes.

[0012] A waste heat recovery method employs a waste heat recovery boiler as described above. The flue gas from combustion is introduced into the boiler body through a first flue gas inlet. After being filtered by a filter plate, it enters a heat exchange cylinder. The flowing flue gas drives the large spiral blades to rotate. The large spiral blades drive the rotating cylinder to rotate through a rotating plate. The small spiral blades inside the rotating cylinder rotate and drive the water in the water pipe to flow synchronously, so as to match the flow velocity of the water with the flow velocity of the flue gas.

[0013] The beneficial effects of this invention are as follows: This invention discloses a waste heat recovery boiler that, by applying the force driving the flue gas to drive the water flow, achieves a match between the water flow velocity and the flue gas flow velocity, thereby improving the utilization efficiency of flue gas waste heat. Furthermore, the use of a rotating drum with spiral blades separates the transport of flue gas and water, resulting in a more compact and convenient device. Attached Figure Description

[0014] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a schematic diagram of the structure of the device of the present invention; Figure 2 This is a schematic diagram of the structure of the spiral large blade of the present invention; Figure 3 This is a schematic diagram of the heat exchange plate. Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0015] The following are the markings in the attached diagram: Boiler body 1, First flue gas inlet 2, First flue gas outlet 3, Heat exchange cylinder 4, Second flue gas inlet 5, Second flue gas outlet 6, Water pipe 7, Water inlet pipe 8, Water outlet pipe 9, Large spiral blade 10, Rotary cylinder 11, Small spiral blade 12, Separator block 13, Water outlet 14, Water inlet 15, Rotating disc 16, Heat exchange plate 17, Heat exchange channel 18, Inner plate 19, Outer plate 20, Slot 21, Slot block 22, Spring 23, Rotating ring 24, Ring groove 25, Filter plate 26, Hollow tube 27, Electrically controlled valve 28. Detailed Implementation

[0016] like Figures 1-4 As shown, the present invention discloses a waste heat recovery boiler, including a boiler body 1. The main body of the boiler body 1 is a vertically arranged cylindrical structure. The lower end and the upper end of the boiler body 1 are respectively provided with a first flue gas inlet 2 and a first flue gas outlet 3. The first flue gas inlet 2 is located on the lower side of the boiler body 1 and can be directly connected to the flue gas discharge port of the combustion furnace. The boiler body 1 is placed directly on the ground.

[0017] A heat exchange cylinder 4 is coaxially mounted on the inner side of the boiler body 1. The lower and upper ends of the heat exchange cylinder 4 are respectively provided with a second flue gas inlet 5 and a second flue gas outlet 6. Flue gas from the lower side of the boiler body 1 passes through the heat exchange cylinder 4, enters its upper side, and then exits through the first flue gas outlet 3. A water pipe 7 is coaxially mounted in the center of the heat exchange cylinder 4. The water pipe 7 is used to supply water for heat exchange. The lower and upper ends of the water pipe 7 are respectively connected to a water inlet pipe 8 and a water outlet pipe 9. The water inlet pipe 8 is connected to the cold water end. After heat exchange inside the boiler body 1, the water is discharged through the water outlet pipe 9.

[0018] A large spiral blade 10 is installed on the lower outer side of the water pipe 7. The inlet pressure of the flue gas can drive the large spiral blade 10 to rotate. A rotating cylinder 11 is installed in the heat exchange cylinder 4 at the upper part of the water pipe 7. Small spiral blades 12 are installed on the inner wall of the rotating cylinder 11. A partition block 13 is installed on the inner side of the water pipe 7. An outlet 14 and an inlet 15 are opened on the outer side of the water pipe 7 on the inner side of the rotating cylinder 11. The water in the water pipe 7 first enters the rotating cylinder 11 through the outlet 14. Driven by the small spiral blades 12, it enters the water pipe 7 again through the inlet 15. The positions of the outlet 14 and the inlet 15 correspond to the inlet pipe 8 and the outlet pipe 9, respectively, and are arranged on both sides of the partition block 13. The water that re-enters the water pipe 7 can be discharged through the outlet pipe 9. The large spiral blade 10 is connected to the rotating cylinder 11 through the rotating disk 16. This invention utilizes the force of flue gas to drive water flow. The rotation speed of the small spiral blade 12 is determined by the large spiral blade 10, which in turn is determined by the flow velocity of the flue gas. Therefore, the flow velocity of the water and the flow velocity of the flue gas can be matched, thereby improving the utilization efficiency of flue gas waste heat. This invention employs a configuration of a rotating drum 11 and small spiral blades 12, separating the transport of flue gas and water. The device is more compact and easier to use.

[0019] In this embodiment, multiple heat exchange plates 17 are installed on the outer side of the rotating drum 11. The heat exchange plates 17 are evenly spaced along the circumference of the rotating drum 11. Heat exchange channels 18 are formed on the heat exchange plates 17, with two openings of each channel corresponding to the positions of the inlet 15 and outlet 14, respectively. By setting up the heat exchange plates 17, excess water can enter the heat exchange channels 18 of the heat exchange plates 17 for heat exchange. Since the heat exchange plates 17 can rotate, the heat exchange space can be increased, improving the heat exchange efficiency. The heat exchange channels 18 of this invention can take various forms, such as curved types, or combinations of multiple channels, which can be selected as needed, as will be understood by those skilled in the art.

[0020] In this embodiment, the heat exchange plate 17 includes an inner plate 19 and an outer plate 20 fixedly connected to the inner plate 19. Two openings of the heat exchange channel 18 are formed on the inner plate 19 and communicate with the inner side of the rotating cylinder 11. Strip grooves are formed on both the inner plate 19 and the outer plate 20, and these strip grooves combine to form the heat exchange channel 18. This design facilitates the molding and manufacturing of the strip grooves within the heat exchange plate 17, thereby reducing the manufacturing cost of the heat exchange plate 17.

[0021] In this embodiment, the rotating disk 16 is fixedly connected to the rotating cylinder 11. The rotating disk 16 is made of breathable filter material and rotates in conjunction with the inner wall of the heat exchange cylinder 4. A slot 21 is provided on the rotating disk 16. The large spiral blade 10 is made of elastic material, and a locking block 22 that mates with the slot 21 is fixed to the end face of the large spiral blade 10. An elastic support device is installed between the heat exchange cylinder 4 and the heat exchange plate 17. By designing the large spiral blade 10 to be compressible, when the flue gas pressure is too high, it can push the rotating disk 16 to move upward, and the rotating cylinder 11 and the heat exchange plate 17 connected to it will move upward together. At this time, the large spiral blade 10 is stretched, and the pitch increases, thereby reducing the pushing speed of the flue gas, making the heat exchange more complete and reducing the waste of resources.

[0022] In this embodiment, the elastic support device includes a spring 23 and a rotating ring 24. The rotating ring 24 can be a rotating bearing. One end of the spring 23 is connected to the heat exchange cylinder 4, and the other end is connected to the rotating ring 24. The rotating ring 24 is fitted into the annular groove 25 opened on the heat exchange plate 17. The center of the spiral blade 12 forms a central hole through which the water supply pipe 7 passes, avoiding friction between it and the water pipe 7 and facilitating water flow.

[0023] In this embodiment, a filter plate 26 is installed at the lower end of the heat exchange cylinder 4. The filter plate 26 is formed inside the second flue gas inlet 5. The flue gas can be filtered through the filter plate 26 to reduce the pollution of the device by the flue gas.

[0024] In this embodiment, multiple hollow tubes 27 are installed on the outside of the heat exchange tube. The axis of the hollow tubes 27 is parallel to the axis of the boiler body 1. The two ends of the hollow tubes 27 face the side where the first flue gas inlet 2 and the first flue gas outlet 3 are located, respectively. The hollow tubes 27 are evenly distributed around the heat exchange tube along its circumference. An electrically controlled valve 28 is installed on the inside of the hollow tubes 27. By designing multiple hollow tubes 27, the amount of flue gas entering the heat exchange tube can be controlled to a certain extent. When it is necessary to increase the amount of flue gas in the heat exchange tube, all the hollow tubes 27 are closed, and all the flue gas flows out of the heat exchange tube. Conversely, opening the hollow tubes 27 can achieve the diversion of flue gas and avoid overheating.

[0025] A waste heat recovery method employs a waste heat recovery boiler as described above. The flue gas from combustion is introduced into the boiler body 1 through the first flue gas inlet 2, filtered by the filter plate 26, and then enters the heat exchange cylinder 4. The flowing flue gas drives the large spiral blades 10 to rotate, and the large spiral blades 10 drive the rotating cylinder 11 to rotate through the rotating plate. After the small spiral blades 12 inside the rotating cylinder 11 rotate, they can drive the water in the water pipe 7 to flow synchronously, so as to achieve a match between the water flow velocity and the flue gas flow velocity.

Claims

1. A waste heat recovery boiler, characterized in that: The boiler body is a vertically arranged cylindrical structure. A first flue gas inlet and a first flue gas outlet are located at the lower and upper ends of the boiler body, respectively. A heat exchange cylinder is coaxially mounted inside the boiler body. A second flue gas inlet and a second flue gas outlet are located at the lower and upper ends of the heat exchange cylinder, respectively. A water pipe is coaxially mounted in the center of the heat exchange cylinder. A water inlet pipe and a water outlet pipe are connected to the lower and upper ends of the water pipe, respectively. Large spiral blades are mounted on the lower outer side of the water pipe. A rotating cylinder is rotatably mounted inside the heat exchange cylinder at the upper part of the water pipe. Small spiral blades are mounted on the inner wall of the rotating cylinder. A partition block is installed inside the water pipe. An outlet and a water inlet are located inside the rotating cylinder and outside the water pipe. The positions of the outlet and inlet correspond to the positions of the inlet and outlet pipes, respectively, and are arranged on both sides of the partition block. The large spiral blades are connected to the rotating cylinder via a rotating disc.

2. The waste heat recovery boiler according to claim 1, characterized in that: Multiple heat exchange plates are installed on the outside of the rotating drum. The heat exchange plates are evenly spaced along the circumference of the rotating drum. Heat exchange channels are opened on the heat exchange plates, and the two openings of the heat exchange channels correspond to the positions of the water inlet and the water outlet, respectively.

3. A waste heat recovery boiler according to claim 2, characterized in that: The heat exchange plate includes an inner plate and an outer plate fixedly connected to the inner plate. The two openings of the heat exchange channel are opened on the inner plate and communicate with the inner side of the rotating cylinder. The inner plate and the outer plate are provided with strip grooves, and the strip grooves on the inner plate and the outer plate are combined to form a heat exchange channel.

4. A waste heat recovery boiler according to claim 3, characterized in that: The rotating disk is fixedly connected to the rotating cylinder, and the rotating disk rotates in conjunction with the inner wall of the heat exchange cylinder. The rotating disk has a slot, the large spiral blades are made of elastic material, and the end face of the large spiral blades is fixed with a locking block that mates with the slot. An elastic support device is installed between the heat exchange cylinder and the heat exchange plate.

5. A waste heat recovery boiler according to claim 4, characterized in that: The elastic support device includes a spring and a rotating ring. One end of the spring is connected to the heat exchange cylinder, and the other end is connected to the rotating ring. The rotating ring is fitted into a groove in the heat exchange plate.

6. A waste heat recovery boiler according to claim 5, characterized in that: The center of the spiral blades forms the central hole through which the water supply pipe passes.

7. A waste heat recovery boiler according to claim 6, characterized in that: A filter plate is installed at the lower end of the heat exchange cylinder, and the filter plate is formed inside the second flue gas inlet.

8. A waste heat recovery boiler according to claim 7, characterized in that: Multiple hollow tubes are installed on the outside of the heat exchange tubes. The axis of the hollow tubes is parallel to the axis of the boiler body. The two ends of the hollow tubes face the first flue gas inlet and the first flue gas outlet, respectively. The hollow tubes are evenly distributed around the heat exchange tubes along the circumference. Electrically controlled valves are installed on the inside of the hollow tubes.

9. A waste heat recovery method, characterized in that: Using the waste heat recovery boiler as described in claim 8, the flue gas from combustion is introduced into the boiler body through the first flue gas inlet. After being filtered by the filter plate, it enters the heat exchange cylinder. The flowing flue gas drives the large spiral blades to rotate. The large spiral blades drive the rotating cylinder to rotate through the rotating plate. After the small spiral blades inside the rotating cylinder rotate, they can drive the water in the water pipe to flow synchronously, so as to match the flow velocity of the water with the flow velocity of the flue gas.

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