Efficient flue gas waste heat recovery device

Abstract

An efficient flue gas waste heat recovery device comprises a waste heat recovery assembly assembled with a flue gas outlet of an evaporator. The circulating pipe assembly is arranged on one side of the waste heat recovery assembly, the waste heat recovery assembly converts flue gas waste heat in the waste heat recovery assembly into available energy according to the heat exchange principle, and the preheating process of circulating water in the circulating pipe assembly is achieved; the waste heat recovery assembly comprises two supports and a plurality of barrels assembled between the two supports, two spiral flow guide plates are symmetrically distributed on the outer wall of a single transmission pipe, when a flue gas pipeline rotates, the two spiral flow guide plates can generate hedging vortexes of local areas in the corresponding barrels, the flow speed of circulating water is slowed down, and the heat exchange efficiency of the flue gas pipeline is improved. The process is performed synchronously as follows: the structural characteristic that the diameters of the transmission pipes are gradually reduced from the middle to the two ends enables the flue gas injected into the transmission pipes to decelerate step by step when passing through the middle parts of the plurality of transmission pipes, so that the contact time of the flue gas and circulating water is prolonged, and the heat conduction efficiency of the flue gas and the circulating water is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery, and in particular to a high-efficiency flue gas waste heat recovery device. Background Art

[0002] The heat energy of flue gas emissions accounts for 20% to 50% of the total energy consumption of industrial production (for example, the flue gas temperature in thermal power, metallurgy, cement and other industries can reach 300-600℃). Direct discharge causes huge energy waste.

[0003] Install a flue gas waste heat recovery device on the flue gas emission path, such as a shell and tube heat exchanger or a plate heat exchanger. A heat transfer medium (such as water, air or thermal oil, etc.) is provided inside the heat exchanger. Through the heat exchange between the flue gas and the heat transfer medium, the heat in the flue gas is transferred to the heat transfer medium. Existing waste heat recovery devices:

[0004] First, the recovery efficiency is low, the flue gas residence time is short, and the heat cannot be effectively absorbed and utilized;

[0005] Second, in the condensate treatment process for low-temperature economizers, the water temperature is 50°C, and it is often necessary to preheat the condensate to increase the inlet condensate temperature of the low-temperature economizer to 100°C-120°C, thereby solving the problem of low-temperature economizer blockage. How to efficiently apply the flue gas waste heat in the condensate treatment process of the low-temperature economizer?

[0006] For this purpose, this high-efficiency flue gas waste heat recovery device is designed. Summary of the Invention

[0007] Therefore, the technical problem to be solved by the present invention is: low heat recovery efficiency.

[0008] The above technical problems are solved by the following technical solutions: The present invention proposes a high-efficiency flue gas waste heat recovery device, comprising: a waste heat recovery assembly assembled with the flue gas outlet of the evaporator; a circulation pipe assembly arranged on one side of the waste heat recovery assembly, wherein the waste heat recovery assembly converts the waste heat of the flue gas inside it into usable energy through the heat exchange principle, thereby realizing the preheating process of the circulating water inside the circulation pipe assembly; the waste heat recovery assembly includes two supports and a plurality of cylinders assembled between the two supports, wherein adjacent cylinders are connected by a pipe arranged therebetween, and the inlet and outlet ends of the circulation pipe assembly are respectively connected to the first and tail cylinders; it also includes a plurality of flue gas pipes running across the plurality of cylinders, and each flue gas pipe includes a branch pipe arranged between adjacent cylinders and rotatable, and a transmission pipe placed inside each cylinder and connected to the adjacent branch pipes and fixed, the diameter of the transmission pipe decreasing from the middle to the two ends; it also includes spiral guide plates symmetrically fixed on the outer wall of each transmission pipe, when the flue gas pipe rotates, the two opposing spiral guide plates generate counter-vortexes to slow down the flow rate of the circulating water.

[0009] In a preferred embodiment of the high-efficiency flue gas waste heat recovery device of the present invention, a first rotary sealing plug is respectively provided between each branch pipe and the two cylinders connected thereto.

[0010] In a preferred embodiment of the high-efficiency flue gas waste heat recovery device described in the present invention: a number of flue gas ducts are also provided with an air intake assembly and an air outlet assembly with the same structure at both ends, wherein the air intake assembly includes a docking pipe assembled with the flue gas outlet of the evaporator, a number of connecting pipes arranged at the end of the docking pipe away from the evaporator, and an annular pipe connected to the number of connecting pipes, and the annular pipe is provided with a first connecting pipe corresponding to the number of flue gas ducts; it also includes a number of second connecting pipes rotatably installed at the end of the first cylinder, and one end of each second connecting pipe is connected to and fixed with the end of the transmission pipe arranged in the first cylinder, and the other end is rotatably installed with the corresponding first connecting pipe; and an engaging drive assembly for the synchronous rotation of the number of second connecting pipes.

[0011] In a preferred embodiment of the high-efficiency flue gas waste heat recovery device of the present invention: the meshing drive assembly includes a drive motor fixed in the middle of the annular tube, a central gear fixed to the output end of the drive motor, and a planetary gear fixed on each second connecting tube and meshing with the central gear.

[0012] In a preferred embodiment of the high-efficiency flue gas waste heat recovery device of the present invention, a second rotary sealing plug is installed between the first connecting pipe and its corresponding second connecting pipe.

[0013] In a preferred embodiment of the high-efficiency flue gas waste heat recovery device of the present invention: a third rotary sealing plug is installed between each of the second connecting pipes and the head and tail cylinders.

[0014] In a preferred embodiment of the high-efficiency flue gas waste heat recovery device of the present invention: connecting rods are rotatably installed at both ends of each cylinder, wherein the two connecting rods arranged opposite to each other are fixed, and the two connecting rods located at the head and the tail are fixedly connected to the two central gears respectively, and a support rod is arranged inside each of the cylinders and fixed to the adjacent connecting rods, and each of the support rods is fixed with a fan blade.

[0015] In a preferred embodiment of the high-efficiency flue gas waste heat recovery device of the present invention: a fourth rotary sealing plug is installed between each connecting rod and the cylinder connected thereto.

[0016] In a preferred embodiment of the high-efficiency flue gas waste heat recovery device of the present invention: the circulation pipe assembly includes connecting pieces fixed on the top of the first and tail cylinders and connected thereto; and mounting pieces arranged on each of the connecting pieces; and also includes a box body, in which a circulation return pipe is arranged, wherein the two ends of the circulation return pipe are respectively assembled with two mounting pieces; and a drainage pump and a suction pump are respectively arranged at both ends of the circulation return pipe.

[0017] In a preferred embodiment of the high-efficiency flue gas waste heat recovery device of the present invention: the mounting member is composed of a plurality of butt joints connected to the connecting member and a control valve provided on each butt joint.

[0018] The beneficial effects of the present invention are: 1. Two spiral guide plates are symmetrically distributed on the outer wall of a single transmission pipe provided in the present invention. When the flue gas pipe rotates, the two spiral guide plates can generate counter-vortexes in local areas inside the corresponding cylinder, thereby slowing down the flow rate of the circulating water. Synchronous with this process is the structural characteristic that the diameter of the transmission pipe decreases from the middle to the two ends, so that the flue gas injected into the transmission pipe is gradually decelerated when passing through the middle of several transmission pipes, thereby prolonging the contact time between the flue gas and the circulating water and improving the heat conduction efficiency between the two.

[0019] 2. As another embodiment of the present invention, the driving motor is configured to rotate the flue gas duct fixed to the planetary gear one by one, and at the same time, it can synchronously drive the support rod, fan blades and connecting rod fixed to the central gear to rotate. Specifically, when the fan blades installed in each cylinder rotate, the circulating water injected into the cylinder can be stirred from the middle to the sides, further improving the heat conduction efficiency of the circulating water. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings of the embodiments of the present invention. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Among them:

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention from a first viewing angle;

[0022] Figure 2 is a schematic diagram of the third perspective structure of the present invention;

[0023] Figure 3 A schematic diagram of a partially disassembled three-dimensional structure from a first perspective of the present invention;

[0024] Figure 4 A schematic diagram of a partially disassembled three-dimensional structure from a second perspective of the present invention;

[0025] Figure 5 This is a partially disassembled top view of an enlarged structure of the present invention;

[0026] Figure 6 It is a schematic diagram of the enlarged structure at A;

[0027] Figure 7 This is a schematic diagram of the partially enlarged structure of the flue gas duct;

[0028] Figure 8 for Figure 7 A schematic diagram of the front structure of FIG.

[0029] Figure 9 This is a schematic diagram of the enlarged structure at point B.

[0030] In the figure: 111, support; 112, cylinder; 113, branch pipe; 114, pipe body; 211, box body; 212, circulation return pipe; 213, connecting piece; 214, docking joint; 215, drainage pump; 216, suction pump; 311, docking pipe; 312, connecting pipe; 313, annular pipe; 314, first connecting pipe; 315, second connecting pipe; 316, second rotary sealing plug; 411, drive motor; 412, central gear; 413, planetary gear; 511, transmission pipe; 512, spiral guide plate; 611, support rod; 612, fan blade; 613, connecting rod. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0032] The terms used in the present invention are those commonly used in the art in view of the functions of the present invention, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as the meanings of the terms and the overall description of the present invention.

[0033] See also Figures 1 to 9The present invention preferably provides a technical solution: a high-efficiency flue gas waste heat recovery device, comprising: a waste heat recovery component assembled with the flue gas outlet of the evaporator; a circulation pipe component arranged on one side of the waste heat recovery component, wherein the waste heat recovery component converts the waste heat of the flue gas inside it into usable energy through the heat exchange principle, thereby realizing the preheating process of the circulating water inside the circulation pipe component; the waste heat recovery component comprises two supports 111, and a plurality of cylinders 112 assembled between the two supports 111, wherein adjacent cylinders 112 are connected through a pipe 114 arranged therebetween, and the inlet and outlet ends of the circulation pipe component are connected. It is respectively connected to the head and tail cylinders 112; it also includes a number of flue gas ducts that run across the cylinders 112, and each flue gas duct includes a branch pipe 113 that is arranged between adjacent cylinders 112 and can rotate, and a transmission pipe 511 that is placed inside each cylinder 112 and connected and fixed to the adjacent branch pipe 113, and the diameter of the transmission pipe 511 decreases from the middle to the two ends; it also includes spiral guide plates 512 symmetrically fixed on the outer wall of each transmission pipe 511. When the flue gas duct rotates, the two opposite spiral guide plates 512 generate counter-vortexes to slow down the flow rate of the circulating water.

[0034] Combine Figure 1 、 2 As shown, a plurality of cylinders 112 are placed between two supports 111 and are connected through the pipe body 114 arranged therebetween. At the same time, the circulation pipe assembly is connected with the first and last cylinders 112, that is, the circulation process of the circulating water is realized. A plurality of flue gas pipes pass through the interior of the plurality of cylinders 112 and are assembled with the flue gas outlet of the evaporator to establish a branch flow of the flue gas path. Here, the flue gas and the circulating water are distributed inside and outside, and the flue gas is combined with the flue gas outlet. Figure 2 、 3 As shown in FIG4 , when the cylinder 112 and the flue gas duct provided in the cylinder 112 are respectively filled with circulating water and hot flue gas, the preheating process of the circulating water can be achieved by utilizing the heat conduction principle;

[0035] In order to enhance the efficiency of heat conduction between the two, Figure 7 、 8 As shown, the outer wall of a single transmission pipe 511 provided by the present invention has two spiral guide plates 512 symmetrically distributed. When the flue gas duct rotates, the two spiral guide plates 512 can generate a localized counter-vortex flow inside the corresponding cylinder 112, thereby slowing down the flow rate of the circulating water. Simultaneously with this process, the diameter of the transmission pipe 511 decreases from the middle to both ends. Figure 5 、 7 As shown in FIG. 8 , the flue gas injected into the transmission pipe 511 is gradually decelerated when passing through the middle of the transmission pipes 511 , thereby extending the contact time between the flue gas and the circulating water and improving the heat conduction efficiency between the two.

[0036] The flue gas waste heat recovery design of the present invention achieves a win-win situation in terms of energy, environment and economy by "turning waste into treasure". The flue gas pipeline is arranged in a single transmission pipe 511 whose diameter decreases from the middle to both ends. The spiral guide plates 512 symmetrically arranged on the outer periphery of the transmission pipe 511 are used to slow down the flow rate of the flue gas and circulating water, thereby extending the heat conduction time between the two and enhancing the heat conduction efficiency of the two.

[0037] The circulating water inside the circulating pipe assembly here can preferably be the condensate of the low-temperature economizer, which can increase the inlet condensate temperature of the low-temperature economizer from 50°C to 100°C-120°C, thereby improving the blockage problem of the low-temperature economizer.

[0038] Furthermore, a first rotating sealing plug is provided between each branch pipe 113 and the two cylinders 112 connected thereto. This design can improve the stability of the flue gas duct when it rotates relative to the cylinder 112 .

[0039] Example 2

[0040] As another embodiment of the present invention, the head and tail ends of a number of flue gas ducts are respectively provided with air intake components and air outlet components with the same structure, wherein the air intake component includes a docking tube 311 assembled with the flue gas outlet of the evaporator, a number of connecting tubes 312 arranged at the end of the docking tube 311 away from the evaporator, and an annular tube 313 connected with the number of connecting tubes 312, and the annular tube 313 is provided with a first connecting tube 314 corresponding to the number of flue gas ducts; it also includes a number of second connecting tubes 315 rotatably installed at the end of the first cylinder 112, and one end of each second connecting tube 315 is connected and fixed to the end of the transmission tube 511 provided in the first cylinder 112, and the other end is rotatably installed with the corresponding first connecting tube 314; and an engaging drive component for the synchronous rotation of the number of second connecting tubes 315.

[0041] In this embodiment, the air inlet components and the air outlet components respectively provided at the head and tail ends of the plurality of smoke pipes have the same structure. Figure 1 、 2 As shown, the air intake assembly is explained here;

[0042] The specific air intake assembly includes a butt joint pipe 311, a connecting pipe 312, a ring pipe 313, a first connecting pipe 314 and a second connecting pipe 315 which are connected in sequence. The butt joint pipe 311 is assembled with the smoke outlet of the evaporator. The second connecting pipe 315 is rotatably mounted on the first cylinder 112, and one end thereof is fixed and connected to the transmission pipe 511 of the first smoke pipe, and the other end is rotatably mounted with the corresponding first connecting pipe 314. Figure 6 When the meshing drive assembly drives the second connecting pipes 315 to rotate, the synchronous rotation process of the flue gas ducts can be realized, thereby realizing the transmission process of the spiral guide plates 512.

[0043] Furthermore, the meshing drive assembly includes a drive motor 411 fixed to the middle of the annular tube 313 , a central gear 412 fixed to the output end of the drive motor 411 , and a planetary gear 413 fixed to each second connecting tube 315 and meshing with the central gear 412 .

[0044] Combine Figure 6 The central gear 412 at the output end of the driving motor 411 is engaged with the planetary gear 413 fixed on the second connecting pipe 315. When the driving motor 411 is running, the synchronous rotation process of the plurality of second connecting pipes 315 can be realized, and the rotation process of the plurality of flue gas ducts can be further realized.

[0045] Furthermore, a second rotary sealing plug 316 is installed between the first connecting pipe 314 and its corresponding second connecting pipe 315. Figure 6 , improving the sealing of the connection between the two.

[0046] Furthermore, a third rotating sealing plug is installed between each second connecting pipe 315 and the first cylinder 112 .

[0047] Example 3

[0048] As other embodiments of the present invention, connecting rods 613 are rotatably installed at both ends of each cylinder 112, wherein the two connecting rods 613 arranged opposite to each other are fixed, the two connecting rods 613 located at the head and the tail are fixedly connected to the two center gears 412 respectively, and a support rod 611 is arranged inside each cylinder 112 and fixed to the adjacent connecting rods 613, and each support rod 611 is fixed with a fan blade 612.

[0049] Combine Figure 9 As shown, when the driving motor 411 drives the flue gas duct fixed to the planetary gear 413 to rotate, it can synchronously drive the support rod 611, the fan blade 612 and the connecting rod 613 fixed to the central gear 412 to rotate. Specifically, when the fan blade 612 in each cylinder 112 rotates, the circulating water injected into the cylinder 112 can be stirred from the middle to both sides, thereby improving the heat conduction efficiency of the circulating water.

[0050] Furthermore, a fourth rotary sealing plug is installed between each connecting rod 613 and the cylinder 112 connected thereto.

[0051] Example 4

[0052] As another embodiment of the present invention, the circulation pipe assembly includes connecting pieces 213 respectively fixed on the top of the first and tail cylinders 112 and connected thereto; and mounting pieces arranged on each connecting piece 213; and also includes a box body 211, in which a circulation return pipe 212 is arranged, wherein the two ends of the circulation return pipe 212 are respectively assembled with two mounting pieces; and a drainage pump 215 and a suction pump 216 respectively arranged at the two ends of the circulation return pipe 212.

[0053] Combined with Figure 1 、 2 As shown, the circulating return pipe 212 provided in the box body 211 is respectively assembled with the mounting parts provided on the first and the last cylinders 112 at both ends and is respectively provided with a drainage pump 215 and a suction pump 216. When the drainage pump 215 is running, the circulating cold water inside the circulating return pipe 212 can be injected into the first cylinder 112, and the circulating cold water that undergoes heat conduction through several cylinders 112 can be preheated. The preheated circulating water is again sucked into the circulating return pipe 212 by the power provided by the suction pump 216, thereby realizing the heat recycling process.

[0054] Furthermore, each mounting part is composed of several docking joints 214 connected to the connecting part 213 and a control valve arranged on each docking joint 214. Here, the docking joints 214 can be selected as several connecting pipes adapted to different heat transfer media (water, air or thermal oil, etc.). Here, they can be selected to be connected to the condensate generated by the low-temperature economizer to improve the applicability of the device.

[0055] Finally, it should be pointed out that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A high-efficiency flue gas waste heat recovery device, characterized by: include, Waste heat recovery assembly assembled with the evaporator flue gas outlet; A circulation pipe assembly is provided on one side of the waste heat recovery assembly, wherein the waste heat recovery assembly converts the waste heat of the flue gas inside it into usable energy through the heat exchange principle, thereby realizing the preheating process of the circulating water inside the circulation pipe assembly; The waste heat recovery assembly comprises two supports (111), and a plurality of cylinders (112) assembled between the two supports (111), wherein adjacent cylinders (112) are connected via a pipe (114) arranged therebetween, and the inlet and outlet ends of the circulation pipe assembly are respectively connected to the first and the last cylinders (112); The device further comprises a plurality of smoke ducts running across the plurality of cylinders (112), and each smoke duct comprises a rotatable branch pipe (113) disposed between adjacent cylinders (112), and a transmission pipe (511) disposed inside each cylinder (112) and connected and fixed to the adjacent branch pipe (113), wherein the diameter of the transmission pipe (511) decreases gradually from the middle to both ends; It also includes spiral guide plates (512) symmetrically fixed on the outer wall of each transmission pipe (511). When the smoke duct rotates, the two opposite spiral guide plates (512) generate counter-vortexes to slow down the flow rate of the circulating water.

2. The high-efficiency flue gas waste heat recovery device according to claim 1 is characterized in that: A first rotary sealing plug is respectively provided between each branch pipe (113) and the two cylinders (112) connected thereto.

3. The high-efficiency flue gas waste heat recovery device according to claim 2, characterized in that: The head and tail ends of the plurality of flue gas ducts are respectively provided with air intake components and air outlet components with the same structure, wherein the air intake component includes a butt joint pipe (311) assembled with the flue gas outlet of the evaporator, a plurality of connecting pipes (312) arranged at the end of the butt joint pipe (311) away from the evaporator, and an annular pipe (313) connected with the plurality of connecting pipes (312), wherein the annular pipe (313) is provided with a first connecting pipe (314) corresponding to the plurality of flue gas ducts; and further includes a plurality of second connecting pipes (315) rotatably mounted on the end of the first cylinder (112), wherein one end of each second connecting pipe (315) is connected and fixed to the end of the transmission pipe (511) arranged in the first cylinder (112), and the other end is rotatably mounted with the corresponding first connecting pipe (314); and an engaging drive component for synchronous rotation of the plurality of second connecting pipes (315).

4. The high-efficiency flue gas waste heat recovery device according to claim 3 is characterized in that: The meshing drive assembly comprises a drive motor (411) fixed to the middle of the annular tube (313), a central gear (412) fixed to the output end of the drive motor (411), and a planetary gear (413) fixed to each second connecting tube (315) and meshing with the central gear (412).

5. The high-efficiency flue gas waste heat recovery device according to claim 4 is characterized in that: A second rotary sealing plug (316) is installed between the first connecting pipe (314) and its corresponding second connecting pipe (315).

6. The high-efficiency flue gas waste heat recovery device according to claim 5, characterized in that: A third rotary sealing plug is installed between each of the second connecting pipes (315) and the first cylinder (112).

7. The high-efficiency flue gas waste heat recovery device according to claim 6, characterized in that: Connecting rods (613) are rotatably mounted at both ends of each cylinder (112), wherein two connecting rods (613) arranged opposite to each other are fixed, and the two connecting rods (613) arranged at the head and tail are fixedly connected to the two central gears (412) respectively. A supporting rod (611) is arranged inside each cylinder (112) and fixed to the adjacent connecting rod (613), and a fan blade (612) is fixed on each supporting rod (611).

8. The high-efficiency flue gas waste heat recovery device according to claim 7, characterized in that: A fourth rotary sealing plug is installed between each connecting rod (613) and the cylinder (112) connected thereto.

9. The high-efficiency flue gas waste heat recovery device according to claim 8, characterized in that: The circulation pipe assembly comprises connecting pieces (213) respectively fixed to the tops of the first and the last cylinders (112) and communicating therewith; and mounting pieces arranged on each of the connecting pieces (213); a box (211) in which a circulation return pipe (212) is arranged, wherein two ends of the circulation return pipe (212) are respectively assembled with two mounting pieces; and a drainage pump (215) and a suction pump (216) respectively arranged at the two ends of the circulation return pipe (212).

10. The high-efficiency flue gas waste heat recovery device according to claim 9, characterized in that: Each of the mounting parts is composed of a plurality of butt joints (214) communicating with the communicating part (213) and a control valve arranged on each butt joint (214).

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