Annular cooler waste heat recovery device and using method thereof

Abstract

The invention discloses an annular cooler waste heat recovery device and a using method thereof, and belongs to the technical field of waste heat recovery, and the waste heat recovery device comprises a water supply assembly, a gas conveying pipeline and a plurality of water tanks. According to the waste heat recovery device, flue gas with heat passes through the multiple water tanks in sequence to recover heat in the flue gas, the temperature of the flue gas can be judged according to the change of the heat in the heat water tanks, and therefore the temperature when the flue gas is exhausted is determined, the water tanks can absorb the heat of the flue gas to the maximum degree, and the heat recovery efficiency is improved. Energy waves caused by incomplete heat absorption are avoided, when the temperature in the corresponding water tank in the waste heat recovery device is higher than the temperature of flue gas, the third electromagnetic valve and the second electromagnetic valve corresponding to the corresponding water tank are closed, low-temperature water vapor is prevented from passing through the corresponding water tank, and therefore it can be avoided that heat in the water tank is brought out by the water vapor; by arranging the distance sensor, the water level in the water tank can be judged, and the temperature in the water tank can be judged when the heat in the smoke is collected.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste heat recovery, and in particular relates to a waste heat recovery device for a ring cooler and a use method thereof. Background Art

[0002] Ring cooler is the abbreviation of ring cooler, which is used to effectively cool the hot sintered ore unloaded from the sintering machine. Compared with the belt cooler, the ring cooler has the advantages of less space occupation, less investment and higher equipment utilization rate.

[0003] However, the existing annular cooler will generate excess waste heat after working, so it is generally recovered through a waste heat recovery device. The traditional heat recovery method is to transport the waste heat in the flue gas of the annular cooler to a water tank, and use the water in the water tank to extract the heat for utilization. The inner diameter of the air inlet is larger than the inner diameter of the air outlet, which can effectively ensure that the flue gas stays in the water tank for a certain period of time and ensures a high utilization rate of the waste heat. However, as the water temperature in the water tank increases, the absorption of heat in the flue gas is limited, and the flue gas finally discharged may still have more heat, which will also cause a waste of heat. In view of this, the present application proposes a waste heat recovery device for annular cooler and a method for using the same.

[0004] It should be noted that the above contents belong to the technical knowledge of the inventor and do not necessarily constitute prior art. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a waste heat recovery device for a ring cooler, which recovers the heat in the flue gas by passing the flue gas with heat through multiple water tanks in sequence, and can judge the temperature of the flue gas according to the heat change in the heat water tank, thereby determining the temperature of the flue gas when it is discharged, so that the water tank can absorb the heat of the flue gas to the maximum extent, avoiding energy waste due to incomplete heat absorption.

[0006] To achieve the above-mentioned purpose, the present invention proposes a waste heat recovery device for a ring cooler, wherein the waste heat recovery device comprises a water supply component, a gas transmission pipeline and a plurality of water tanks.

[0007] The gas supply pipeline includes an air intake pipe, which is connected to the smoke exhaust pipe on the annular cooler. A serpentine pipe is arranged in the water tank, one end of the serpentine pipe is connected to the first connecting pipe, and the other end is connected to the second connecting pipe. The first connecting pipe is connected to the air intake pipe, the second connecting pipe on the water tank at the tail is closed at one end located outside, and the remaining second connecting pipes are connected to the first connecting pipe on the adjacent water tank at one end located outside. The gas supply pipeline also includes a third connecting pipe, and the second connecting pipe and the first connecting pipe at the head are both connected to a fifth connecting pipe, and the fifth connecting pipe is connected to the third connecting pipe, a second solenoid valve is installed on the second connecting pipe, a third solenoid valve is installed on the third connecting pipe, an exhaust pipe is connected to the second connecting pipe, a fourth solenoid valve is installed on the exhaust pipe, and a sixth solenoid valve is installed on the first connecting pipe. The exhaust pipe and the fifth connecting pipe are both located on the side of the second solenoid valve close to the corresponding water tank.

[0008] Furthermore, the water supply assembly includes a water pump, the water pump is connected to a first water outlet pipe, the water tank is connected to a first water inlet pipe, the first water inlet pipe is connected to the first water outlet pipe, and a first solenoid valve is installed on the first water inlet pipe.

[0009] Furthermore, the waste heat recovery device also includes a water outlet main pipe, the bottom of the water tank is connected to a drain pipe, the drain pipe is connected to the water outlet main pipe, and a fifth solenoid valve is installed on the drain pipe.

[0010] Furthermore, a float plate is provided inside the water tank, and the interior of the float plate is hollow. A support ring for supporting the float plate is fixed inside the water tank, and the support ring is located above the serpentine tube. An air cylinder is connected above the float plate, and the air cylinder is slidably connected to the top of the water tank. A piston is slidably provided inside the air cylinder, and an air outlet is opened on the top of the air cylinder.

[0011] Furthermore, an L-shaped bracket is fixed above the water tank, and a distance sensor for detecting the height of the piston is fixed below the top plate of the L-shaped bracket. The distance sensor is located directly above the air outlet, and the distance sensor is electrically connected to a preset control system.

[0012] Furthermore, the water tanks are arranged in a straight line.

[0013] A method for using a waste heat recovery device for a ring cooler, the method for using is as follows:

[0014] Open the corresponding first solenoid valve to fill water into the water tank. When the surface is higher than the support ring, the float plate floats up, thereby driving the air cylinder to rise. The water level in the water tank is determined by the change in the air cylinder height detected by the distance sensor. When the water level reaches the preset value, close the corresponding first solenoid valve.

[0015] When the water level reaches the preset value, the temperature in the water tank is determined by observing the distance detected by the distance sensor;

[0016] The second solenoid valve and the third solenoid valve corresponding to the water tank that has reached the preset temperature are closed, and the corresponding fifth solenoid valve is opened to transport hot water of the preset temperature through the water main.

[0017] The sixth solenoid valve corresponding to one of the water tanks is opened, and then the smoke output from the smoke exhaust pipe is controlled by the cooperation of the second solenoid valve and the third solenoid valve to pass through the serpentine pipe in the water tank to be heated in sequence.

[0018] Open the fourth solenoid valve corresponding to the last water tank transmitted, so that the smoke is finally discharged from the corresponding exhaust pipe.

[0019] When the temperature in the corresponding water tank is higher than the temperature of the smoke, the third solenoid valve and the second solenoid valve corresponding to the corresponding water tank are closed.

[0020] Furthermore, the determination method of whether the temperature in the water tank is higher than the temperature of the flue gas is that the temperature in the water tank does not increase after the flue gas passes through the corresponding water tank for a preset time.

[0021] The waste heat recovery device for annular cooler and the use method thereof proposed by the present invention can bring the following beneficial effects:

[0022] 1. The waste heat recovery device of the present invention recovers the heat in the flue gas by passing the flue gas with heat through multiple water tanks in sequence, and can judge the temperature of the flue gas according to the heat change in the heat water tank, so as to determine the temperature of the flue gas when it is discharged, so that the water tank can absorb the heat of the flue gas to the maximum extent, avoiding energy waste caused by incomplete heat absorption;

[0023] 2. When the temperature in the corresponding water tank in the waste heat recovery device of the present invention is higher than the temperature of the flue gas, the third solenoid valve and the second solenoid valve corresponding to the corresponding water tank are closed to prevent the relatively low-temperature water vapor from passing through the corresponding water tank, thereby preventing the water vapor from taking out the heat in the water tank;

[0024] 3. The waste heat recovery device of the present invention is provided with a distance sensor, which can judge the water level in the water tank when filling and draining water, and can also judge the temperature in the water tank when collecting heat in the flue gas, so that one machine can be used for multiple purposes and save equipment costs;

[0025] 4. The waste heat recovery device of the present invention opens the sixth solenoid valve corresponding to one of the water tanks, and then controls the smoke output from the smoke exhaust pipe to pass through the serpentine pipe in the water tank to be heated in sequence through the second solenoid valve and the third solenoid valve, so that the hot gas can selectively pass through the water tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 This is a first-view structural schematic diagram of a ring cooler waste heat recovery device and a method of using the same according to the present invention.

[0028] Figure 2 It is a schematic cross-sectional structure diagram of a waste heat recovery device for a ring cooler and a method of using the same from a second viewing angle of the present invention.

[0029] Figure 3 for Figure 2 Enlarged structural diagram at A in the middle. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in an exemplary manner in conjunction with the accompanying drawings.

[0031] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one scheme", "some schemes", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more schemes or examples in a suitable manner.

[0035] The embodiment of the present invention provides a waste heat recovery device for a ring cooler, such as Figure 1 As shown, the waste heat recovery device includes a water supply component, a gas transmission pipeline and a plurality of water tanks 1 arranged in a straight line.

[0036] The water supply assembly includes a water pump 2 , which is connected to a first water outlet pipe 3 , a first water inlet pipe 4 is connected to the water tank 1 , the first water inlet pipe 4 is connected to the first water outlet pipe 3 , and a first solenoid valve 5 is installed on the first water inlet pipe 4 .

[0037] The gas pipeline includes an air inlet pipe 6, which is connected to the exhaust pipe on the annular cooler. A serpentine pipe 10 is arranged in the water tank 1. Figure 2 As shown, one end of the serpentine tube 10 is connected to the first connecting tube 7, and the other end is connected to the second connecting tube 9, the first connecting tube 7 is connected to the air intake pipe 6, the second connecting tube 9 on the water tank 1 at the tail is closed at one end located outside, and the other second connecting tube 9 is connected to the first connecting tube 7 on the adjacent water tank 1 at one end located outside, the gas transmission pipeline also includes a third connecting tube 12, the second connecting tube 9 and the first connecting tube 7 at the head are both provided with a fifth connecting tube 13, the fifth connecting tube 13 is connected to the third connecting tube 12, a second solenoid valve 11 is installed on the second connecting tube 9, a third solenoid valve 14 is installed on the third connecting tube 12, an exhaust pipe 25 is connected to the second connecting tube 9, a fourth solenoid valve 26 is installed on the exhaust pipe 25, a sixth solenoid valve 8 is installed on the first connecting tube 7, and the exhaust pipe 25 and the fifth connecting tube 13 are both located on the side of the second solenoid valve 11 close to the corresponding water tank 1.

[0038] The waste heat recovery device further includes a water outlet main pipe 15 . A drain pipe 16 is provided at the bottom of the water tank 1 . The drain pipe 16 is connected to the water outlet main pipe 15 . A fifth solenoid valve 17 is installed on the drain pipe 16 .

[0039] The interior of the water tank 1 is provided with a floating plate 19. Figure 3As shown, the interior of the float 19 is hollow, and a support ring 18 for supporting the float 19 is fixed inside the water tank 1, and the support ring 18 is located above the serpentine tube 10. An air cylinder 20 is connected to the top of the float 19, and the air cylinder 20 is slidably connected to the top of the water tank 1. A piston 21 is slidably provided inside the air cylinder 20, and an air outlet 22 is opened on the top of the air cylinder 20. An L-shaped bracket 23 is fixed above the water tank 1, and a distance sensor 24 for detecting the height of the piston 21 is fixed below the top plate of the L-shaped bracket 23. The distance sensor 24 is located directly above the air outlet 22, and the distance sensor 24 is electrically connected to a preset control system.

[0040] A method for using a waste heat recovery device for a ring cooler, the method of using is as follows:

[0041] Opening the corresponding first solenoid valve 5 can fill water into the water tank 1. When the surface is higher than the support ring 18, the float plate 19 floats up, thereby driving the air cylinder 20 to rise. The water level in the water tank 1 is determined by the height change of the air cylinder 20 detected by the distance sensor 24. When the water level reaches the preset value, the corresponding first solenoid valve 5 is closed.

[0042] When the water level reaches the preset value, the sliding distance of the piston 21 in the gas cylinder 20 can be determined by observing the distance detected by the distance sensor 24, thereby determining the expansion degree of the gas in the floating plate 19 and determining the temperature in the water tank 1.

[0043] The second solenoid valve 11 and the third solenoid valve 14 corresponding to the water tank 1 that has reached the preset temperature are closed, and the corresponding fifth solenoid valve 17 is opened, and hot water of the preset temperature is delivered through the water main pipe 15 .

[0044] Open the sixth solenoid valve 8 corresponding to one of the water tanks 1, and then control the smoke output from the smoke exhaust pipe to pass through the serpentine pipe 10 in the water tank 1 to be heated in sequence through the second solenoid valve 11 and the third solenoid valve 14. The specific control method is:

[0045] When the smoke is transmitted in the positive direction between two adjacent water tanks 1, the second solenoid valve 11 between the corresponding two water tanks 1 is opened;

[0046] When smoke is transmitted in the forward direction between two non-adjacent water tanks 1 or in the reverse direction between two water tanks 1, the third solenoid valve 14 corresponding to the transmitting water tank 1 and the third solenoid valve 14 and the second solenoid valve 11 corresponding to the front adjacent water tank 1 of the transmitted water tank 1 are opened (if there is no front water tank, only the corresponding third solenoid valve 14 is opened);

[0047] The fourth solenoid valve 26 corresponding to the last water tank 1 transferred is opened, so that the smoke is finally discharged from the corresponding exhaust pipe 25 .

[0048] When the temperature in the corresponding water tank 1 is higher than the temperature of the flue gas, the judgment method is: the temperature in the water tank 1 does not rise after the flue gas passes through the corresponding water tank 1 for a preset time. At this time, the third solenoid valve 14 and the second solenoid valve 11 corresponding to the corresponding water tank 1 are closed to prevent the lower temperature water vapor from passing through the corresponding water tank 1, thereby preventing the water vapor from taking out the heat in the water tank 1.

[0049] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0050] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A waste heat recovery device for a ring cooler, characterized in that: The waste heat recovery device comprises a water supply component, a gas transmission pipeline and a plurality of water tanks (1); The gas transmission pipeline comprises an air intake pipe (6), the air intake pipe (6) is connected to the smoke exhaust pipe on the annular cooler, a serpentine pipe (10) is arranged in the water tank (1), one end of the serpentine pipe (10) is connected to the first connecting pipe (7), and the other end is connected to the second connecting pipe (9), the first connecting pipe (7) is communicated with the air intake pipe (6), the second connecting pipe (9) on the water tank (1) at the rear end is closed at one end located outside, and the other second connecting pipe (9) is connected to the first connecting pipe (7) on the adjacent water tank (1) at one end located outside, and the gas transmission pipeline further comprises a third connecting pipe (12), the second connecting pipe (9) and the third connecting pipe (13) on the second connecting pipe (9) are connected to the third connecting pipe (14), and the third connecting pipe (15) on the second connecting pipe (9) are connected to the third connecting pipe (16). A fifth connecting pipe (13) is connected to the first connecting pipe (7) at the head, the fifth connecting pipe (13) is connected to the third connecting pipe (12), a second electromagnetic valve (11) is installed on the second connecting pipe (9), a third electromagnetic valve (14) is installed on the third connecting pipe (12), an exhaust pipe (25) is connected to the second connecting pipe (9), a fourth electromagnetic valve (26) is installed on the exhaust pipe (25), a sixth electromagnetic valve (8) is installed on the first connecting pipe (7), and the exhaust pipe (25) and the fifth connecting pipe (13) are both located on the side of the second electromagnetic valve (11) close to the corresponding water tank (1).

2. The waste heat recovery device for annular cooler according to claim 1, characterized in that: The water supply assembly comprises a water pump (2), the water pump (2) is connected to a first water outlet pipe (3), the water tank (1) is connected to a first water inlet pipe (4), the first water inlet pipe (4) is connected to the first water outlet pipe (3), and a first solenoid valve (5) is installed on the first water inlet pipe (4).

3. The waste heat recovery device for annular cooler according to claim 2, characterized in that: The waste heat recovery device also includes a water outlet main pipe (15); a drain pipe (16) is provided at the bottom of the water tank (1); the drain pipe (16) is in communication with the water outlet main pipe (15); and a fifth solenoid valve (17) is installed on the drain pipe (16).

4. The waste heat recovery device for annular cooler according to claim 3, characterized in that: A floating plate (19) is arranged inside the water tank (1), the inside of the floating plate (19) is hollow, a support ring (18) for supporting the floating plate (19) is fixed inside the water tank (1), the support ring (18) is located above the serpentine tube (10), an air cylinder (20) is arranged above the floating plate (19), the air cylinder (20) is slidably connected to the top of the water tank (1), a piston (21) is slidably arranged inside the air cylinder (20), and an air outlet (22) is opened at the top of the air cylinder (20).

5. The waste heat recovery device for annular cooler according to claim 4, characterized in that: An L-shaped bracket (23) is fixed above the water tank (1), and a distance sensor (24) for detecting the height of the piston (21) is fixed below the top plate of the L-shaped bracket (23). The distance sensor (24) is located directly above the air outlet (22), and the distance sensor (24) is electrically connected to a preset control system.

6. The waste heat recovery device for annular cooler according to claim 5, characterized in that: The water tanks (1) are arranged in a straight line.

7. The method for using the waste heat recovery device for annular cooler according to claim 6, characterized in that: The method of use is as follows: Open the corresponding first electromagnetic valve (5) to inject water into the water tank (1); when the surface is higher than the support ring (18), the floating plate (19) floats up, thereby driving the air cylinder (20) to rise; the water level in the water tank (1) is determined by detecting the height change of the air cylinder (20) through the distance sensor (24); when the water level reaches a preset value, close the corresponding first electromagnetic valve (5); When the water level reaches a preset value, the temperature in the water tank (1) is determined by observing the distance detected by the distance sensor (24); The second solenoid valve (11) and the third solenoid valve (14) corresponding to the water tank (1) that has reached the preset temperature are closed, and the corresponding fifth solenoid valve (17) is opened, so that hot water at the preset temperature is delivered through the water main pipe (15); Open the sixth solenoid valve (8) corresponding to one of the water tanks (1), and then control the smoke output from the smoke exhaust pipe to pass through the serpentine pipe (10) in the water tank (1) to be heated in sequence through the second solenoid valve (11) and the third solenoid valve (14); Opening the fourth solenoid valve (26) corresponding to the last water tank (1) transmitted, so that the smoke is finally discharged from the corresponding exhaust pipe (25); When the temperature in the corresponding water tank (1) is higher than the temperature of the smoke, the third solenoid valve (14) and the second solenoid valve (11) corresponding to the corresponding water tank (1) are closed.

8. The method for using the waste heat recovery device for annular cooler according to claim 7, characterized in that: The determination method of whether the temperature in the water tank (1) is higher than the temperature of the flue gas is that the temperature in the water tank (1) does not rise after the flue gas has passed through the corresponding water tank (1) for a preset time.

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