Boiler flue gas waste heat recovery device

Abstract

The utility model discloses a boiler flue gas waste heat recovery device, which relates to the technical field of flue gas waste heat recovery, and comprises a shell, a flue gas inlet pipe and a flue gas outlet pipe are respectively arranged on the side walls of two opposite sides of the shell, a plurality of first flue gas baffles are arranged on the inner wall of the shell, and a plurality of second flue gas baffles are arranged on the inner wall of the shell. A second smoke baffle is arranged between every two adjacent first smoke baffles, the height of the second smoke baffles is smaller than that of the first smoke baffles, and snake-shaped heat exchange pipes are arranged on the inner walls of the first smoke baffles, the second smoke baffles and the shell. The number of the snakelike heat exchange pipe in the shell is one, low-temperature water flows in the snakelike heat exchange pipe for a long time, the heat exchange time is sufficient, the waste heat recovery effect is good, the multiple partition plates are driven by the motor to rotate, and ash is conveyed into the discharging pipe when the multiple partition plates rotate; the heat exchange effect can be effectively prevented from being affected by the fact that the accumulation height of ash at the bottom of the shell reaches the position of the snakelike heat exchange pipe.

Description

TECHNICAL FIELD

[0001] The utility model relates to flue gas waste heat recovery technical field, concretely is a kind of boiler flue gas waste heat recovery device. BACKGROUND

[0002] Boiler is widely used in industrial production, and the high-temperature flue gas discharged carries a large amount of waste heat, which will cause energy waste and environmental pollution if directly discharged. Therefore, boiler flue gas waste heat recovery is crucial. It not only can improve the thermal efficiency of the boiler and reduce fuel consumption, but also can reduce waste gas emission, which meets the requirements of energy saving and sustainable development.

[0003] However, the existing flue gas waste heat recovery device has some shortcomings. When flue gas flows through the waste heat recovery device, solid particulate matters such as fly ash and unburned carbon particles will gradually settle and form ash slag. If not cleaned in time, the ash slag layer will reduce the heat exchange efficiency, increase the flow resistance of flue gas, and exacerbate equipment wear and tear, and even pose a safety hazard. The current common device ignores the convenience of ash slag cleaning in design, some use fixed structure which makes it difficult to clean ash slag, and some have ash cleaning device but the operation is complex and inefficient. Therefore, it is necessary to develop a new device that can efficiently recover waste heat and conveniently clean the settled ash slag. SUMMARY

[0004] In view of the above shortcomings of the prior art, the utility model provides a boiler flue gas waste heat recovery device, the serpentine heat exchange pipe in the shell is one, the low-temperature water flows in the serpentine heat exchange pipe for a long time, the heat exchange time is sufficient, the waste heat recovery effect is better, the motor drives multiple partitions to rotate, and the multiple partitions convey the ash slag to the discharge pipe when rotating, which can effectively prevent the height of the ash slag accumulated at the bottom of the shell from reaching the position of the serpentine heat exchange pipe and affecting the heat exchange effect.

[0005] To achieve the above purpose, the utility model realizes the following technical scheme: a boiler flue gas waste heat recovery device, comprising a shell, the side walls on the opposite sides of the shell are respectively provided with an inlet flue and an outlet flue, a plurality of first smoke baffles are arranged on the inner wall of the shell, a second smoke baffle is arranged between every two adjacent first smoke baffles, the height of the second smoke baffle is lower than that of the first smoke baffle, a serpentine heat exchange pipe is arranged on the inner wall of the shell, the outer wall of the shell near the bottom is provided with a motor, the output shaft of the motor penetrates the side wall of the shell and is connected with a rotating shaft at the end, a plurality of circular plates are arranged on the rotating shaft corresponding to the positions of the multiple second smoke baffles, a plurality of partitions are arranged on the rotating shaft and located on both sides of each circular plate, a plurality of discharge pipes are arranged at the bottom of the shell and located on both sides of the circular plate, and a discharge valve is arranged on each discharge pipe.

[0006] Preferably, the number of partitions in each group is four and arranged in a cross shape.

[0007] Preferably, a plurality of pairs of fixing plates are arranged on the inner wall of the shell and located at both sides of each second smoke baffle, and each pair of fixing plates can correspond to a position of an adjacent pair of partition plates.

[0008] Preferably, the motor is a servo motor.

[0009] The boiler flue gas waste heat recovery device has the following beneficial effects:

[0010] 1. The serpentine heat exchange pipe in the shell is one, the low-temperature water flows in the serpentine heat exchange pipe for a long time, the heat exchange time is sufficient, the waste heat recovery effect is better, the plurality of partition plates are driven to rotate by the motor, and the plurality of partition plates convey the ash residue into the discharge pipe when rotating, so that the height of the ash residue accumulated at the bottom of the shell reaches the position of the serpentine heat exchange pipe and the heat exchange effect is affected.

[0011] 2. After the ash residue falls from the flue gas, the ash residue falls between the pair of partition plates and the pair of fixing plates located above, and the motor is started each time to drive the rotating shaft to rotate by 180 degrees, so that the ash residue is discharged from the discharge pipe. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is an internal structure schematic view of the utility model;

[0013] Figure 2 It is a sectional view of A-A in the utility model. Figure 1

[0014] In the figure: 1, shell; 2, first smoke baffle; 3, second smoke baffle; 4, serpentine heat exchange pipe; 5, smoke inlet pipe; 6, smoke outlet pipe; 7, motor; 8, rotating shaft; 9, partition plate; 10, fixing plate; 11, discharge pipe; 12, discharge valve; 13, round plate. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0016] As Figures 1-2 ​As shown, a boiler flue gas waste heat recovery device, including the shell 1, the side wall of the opposite two sides are provided with the smoke pipe 5 and the smoke pipe 6 respectively, the inner wall of the shell 1 is provided with a plurality of first smoke baffle 2, every two adjacent first smoke baffle 2 is provided with second smoke baffle 3, the height of the second smoke baffle 3 is lower than the height of first smoke baffle 2, a plurality of first smoke baffle 2, second smoke baffle 3 and the inner wall of shell 1 are provided with serpentine heat exchange pipe 4, the outer wall of the shell 1 is close to the bottom and is provided with motor 7, the output shaft of the motor 7 penetrates the side wall of the shell 1 and the end is connected with the rotating shaft 8, a plurality of circular plates 13 are arranged on the rotating shaft 8 and correspond to the position of a plurality of second smoke baffles 3, a plurality of groups of baffle plates 9 are arranged on the rotating shaft 8 and located on both sides of each circular plate 13, a plurality of discharge pipes 11 are arranged on the bottom of the shell 1 and located on both sides of the circular plate 13, and a discharge valve 12 is arranged on each discharge pipe 11; The number of each group of baffle plates 9 is four and is arranged in a cross shape; a plurality of pairs of fixed plates 10 are arranged on the inner wall of the shell 1 and located on both sides of each second smoke baffle 3, and each pair of fixed plates 10 can correspond to the position of an adjacent pair of baffle plates 9; the motor 7 is a servo motor.

[0017] The detailed connection means is a known technology in the art, and the working principle and process are described as follows:

[0018] According to the description attached Figures 1-2 It can be known that the two ends of the serpentine heat exchange pipe 4 extend to the outside of the shell 1 and are connected with the inlet and outlet of the circulating water system, the circulating water system sends low-temperature water into the serpentine heat exchange pipe 4, the smoke pipe 6 is connected with an air induction device, in use, the boiler flue gas flows to the inside of the shell 1 through the smoke pipe 5, because the circular plate 13 arranged on the rotating shaft 8 is located below the plurality of second smoke baffles 3, therefore the flue gas cannot flow from below the second smoke baffles 3, the flue gas flows in the guiding gap between the plurality of first smoke baffles 2 and the second smoke baffles 3 (as shown by the arrows in the attached Figure 1 , and finally flows out from the smoke pipe 6, the flue gas exchanges heat with the low-temperature water in the serpentine heat exchange pipe 4 in the flowing process, to heat the low-temperature water, because the serpentine heat exchange pipe 4 in the shell 1 is one, the low-temperature water flows in the serpentine heat exchange pipe 4 for a long time, therefore there is enough heat exchange time, in the flowing process of the flue gas, part of the ash in the flue gas will fall to the bottom of the shell 1, when it is needed to clean the ash, open the discharge valve 12, start the motor 7 arranged on the outer wall of the shell 1, the output shaft of the motor 7 drives the rotating shaft 8 to rotate, the rotating shaft 8 drives the plurality of groups of baffle plates 9 to rotate, the baffle plates 9 discharge the ash at the bottom of the shell 1 through the discharge pipe 11.

[0019] There is a possibility of implementation, the number of each group of partition plate 9 is four and is cross-shaped, the inner wall of the shell 1 and is located on both sides of each second smoke baffle 3 is provided with a plurality of pairs of fixed plate 10, each pair of fixed plate 10 can be position corresponding to the adjacent pair of partition plate 9, after the ash falls from the flue gas, falls to the position between the pair of partition plate 9 and the pair of fixed plate 10 above, each time the motor 7 starts to drive the rotating shaft 8 rotates 180 degrees, so that the ash is discharged from the discharge pipe 11.

[0020] There is a possibility of implementation, the motor 7 is a servo motor, when the servo motor drives a plurality of groups of partition plate 9 to rotate, by setting the rotation angle, the partition plate 9 above can be rotated to the position of the fixed plate 10.

[0021] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A boiler flue gas waste heat recovery device comprising a housing (1), characterized in that, The shell (1) is provided with an inlet pipe (5) and an outlet pipe (6) on the side walls of the opposite sides, respectively, a plurality of first smoke baffle plates (2) are arranged on the inner wall of the shell (1), a second smoke baffle plate (3) is arranged between every two adjacent first smoke baffle plates (2), the height of the second smoke baffle plate (3) is lower than that of the first smoke baffle plate (2), a plurality of serpentine heat exchange pipes (4) are arranged on the first smoke baffle plates (2), the second smoke baffle plates (3) and the inner wall of the shell (1), a motor (7) is arranged on the outer wall of the shell (1) close to the bottom, the output shaft of the motor (7) penetrates through the side wall of the shell (1) and is connected with a rotating shaft (8) at the end, a plurality of circular plates (13) are arranged on the rotating shaft (8) at positions corresponding to the plurality of second smoke baffle plates (3), a plurality of partition plates (9) are arranged on the rotating shaft (8) at both sides of each circular plate (13), a plurality of discharge pipes (11) are arranged on the bottom of the shell (1) at both sides of the circular plate (13), and a discharge valve (12) is arranged on each discharge pipe (11).

2. A boiler flue gas waste heat recovery device according to claim 1, characterized in that, The number of the partition plates (9) in each group is four and they are arranged in a cross shape.

3. A flue gas heat recovery device for a boiler according to claim 2, characterized in that A plurality of pairs of fixing plates (10) are arranged on the inner wall of the shell (1) at both sides of each second smoke baffle plate (3), and each pair of fixing plates (10) is positionally corresponding to an adjacent pair of partition plates (9).

4. A flue gas waste heat recovery device for a boiler according to claim 1, characterized in that, The motor (7) is a servo motor.

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