Heat exchange device for sodium silicate kiln

Abstract

The utility model discloses a heat exchange device for a sodium silicate kiln, which relates to the field of waste gas treatment and comprises a shell, an exhaust pipe is connected to the left part of the front end of the shell in a penetrating manner, a gas inlet pipe is connected to the right end of the shell in a penetrating manner, and a gas flowmeter is connected to the upper end of the gas inlet pipe in a penetrating manner; a spiral heat exchange pipe is arranged in the center of the interior of the shell in the axial direction of the shell, the two ends of the heat exchange pipe extend to the two ends of the shell correspondingly and extend out of the shell, two movable plates are symmetrically arranged on the portions, located on the two sides of the heat exchange pipe, in the shell, and a heat exchange cavity is defined by the two movable plates and the inner wall of the shell. The movable plate and the movable part are arranged to be matched together, so that the internal volume of the shell can be adjusted, the retention time of waste gas in the shell is prolonged, heat is absorbed more sufficiently, the waste gas can make full contact with the heat exchange pipe, the operation efficiency of equipment is improved, and energy waste is reduced; and the phenomenon of local overheating or supercooling of the heat exchange pipe is avoided, and the heat exchange process is more efficient.

Description

Technical Field

[0001] The utility model relates to the field of waste gas treatment, in particular to a heat exchange device for a sodium silicate kiln. Background Art

[0002] A sodium silicate kiln is a kiln specifically used for the preparation of sodium silicate. The raw materials for producing sodium silicate are quartz sand and soda ash. The two are mixed in a certain proportion and sent to the sodium silicate kiln for calcination at high temperature. The temperature of the kiln during calcination is usually between 1250 and 1400 degrees Celsius. Therefore, the exhaust temperature of the sodium silicate kiln is relatively high. If it is directly discharged, it will cause energy waste. In addition, the temperature of the air entering the sodium silicate kiln also directly affects the thermal efficiency of combustion. Preheating the air entering the sodium silicate kiln can effectively improve the thermal efficiency of combustion and reduce energy consumption. A heat exchange device is required to absorb the temperature of the exhaust gas.

[0003] The prior art (publication number: CN 217844846 U) discloses a heat exchange device for a sodium silicate kiln, an industrial waste gas waste heat recovery heat exchange device, comprising a shell and a waste gas treatment unit; the shell: a switch is fixedly mounted on the upper surface, a heat exchange plate is fixed on the right side inside the shell, the heat exchange plate is wavy, the heat exchange plates are distributed in an array, and an S-shaped heat exchange tube is fixed on the heat exchange plate; the waste gas treatment unit: comprises a mounting tube, a filter, an air pump, a nozzle, an exhaust pipe and a connecting pipe, the inner side of the mounting tube is fixedly connected to the side of the filter.

[0004] Although the above patent filters the exhaust gas entering the shell to participate in waste heat recovery, preventing dust in the exhaust gas from adhering to the heat exchange plate and affecting the heat exchange effect, it has the following disadvantages: the volume of the shell cannot be adjusted. When the exhaust gas flow rate is large, the volume of the shell is too small, and the exhaust gas does not stay in the heat exchanger for a long time, resulting in insufficient heat exchange; or when the flow rate is small, the volume of the heat exchanger is too large, resulting in low operating efficiency of the equipment and energy waste. Further improvement is needed. For this reason, a heat exchange device for a sodium silicate kiln is proposed. Utility Model Content

[0005] In order to solve the technical problems existing in the above-mentioned prior art, the utility model provides a heat exchange device for a sodium silicate kiln.

[0006] To achieve the above object, the utility model provides the following technical solution: comprising a housing, an exhaust pipe is inserted and connected to the left front end of the housing, an intake pipe is inserted and connected to the right end of the housing, and a gas flow meter is inserted and connected to the upper end of the intake pipe;

[0007] A spiral heat exchange tube is arranged at the center of the interior of the shell along its axial direction. The two ends of the heat exchange tube extend to the outside of the shell respectively. Two movable plates are symmetrically arranged on both sides of the heat exchange tube in the shell. A heat exchange chamber is formed between the two movable plates and the inner wall of the shell. The movable plates move toward or away from each other inside the shell so that the volume of the heat exchange chamber changes with the change of the exhaust flow rate.

[0008] Preferably, the upper and lower ends of the housing are both equipped with moving parts, the moving parts are used to drive the moving plate to move in the housing, and the two moving parts are symmetrically distributed up and down;

[0009] The moving part includes a U-shaped frame installed on the shell, and a first motor is installed on the outside of the U-shaped frame. The motor shaft of the first motor extends to the inside of the U-shaped frame and is fixedly sleeved with a first gear. The outside of the shell is rotatably installed with a second gear that meshes with the first gear. A screw rod is fixed on the moving plate and connected. The screw rod extends to the outside of the shell and is threadedly connected to the second gear.

[0010] Preferably, at least one of the two movable plates moves within the housing.

[0011] Preferably, the two movable plates move synchronously toward or away from each other inside the housing.

[0012] Preferably, two limit blocks symmetrically distributed up and down are installed on the left inner wall of the shell, and the two limit blocks are located between the two movable plates.

[0013] Preferably, the heat exchange tube is rotatably connected to the shell.

[0014] Preferably, an L-shaped plate is installed at the left end of the shell, and a second motor is installed on the outside of the L-shaped plate. The motor shaft of the second motor extends to the inside of the L-shaped plate and is fixedly sleeved with a third gear. Rotating disks are rotatably installed at both ends of the shell, and the rotating disks are fixedly sleeved with the heat exchange tubes. An annular tooth is fixed on the outside of one of the rotating disks, and the annular tooth is meshed with the third gear.

[0015] Preferably, the left end and the right end of the heat exchange tube are both fixedly connected with a rotary joint.

[0016] Preferably, two electric valves are provided on the heat exchange tube, and the two electric valves are respectively located on the left and right sides of the shell.

[0017] Compared with the prior art, the utility model provides a heat exchange device for a sodium silicate kiln, which has the following beneficial effects:

[0018] (1) The volume of the heat exchange chamber can be adjusted by arranging a movable plate and a movable component to cooperate with each other. When the flow rate of the gas at the intake pipe increases, the movable component on the upper side is controlled to drive the movable plate to move upward, so that the volume of the heat exchange chamber increases, thereby increasing the residence time of the exhaust gas in the shell and allowing the heat to be absorbed more fully. On the contrary, when it is detected that the flow rate of the gas at the intake pipe decreases, the two movable plates are controlled by the movable component to move closer to each other, reducing the volume of the shell, so that the exhaust gas can fully contact with the heat exchange tube, thereby improving the operating efficiency of the equipment and reducing energy waste.

[0019] (2) The heat exchange tube can be driven to rotate by setting a rotating component. When in use, the second motor is controlled to drive the rotating disk on the left side to rotate through the third gear and the ring gear. The rotating disk drives the heat exchange tube to rotate, which can continuously change the contact area between the exhaust gas and the wall of the heat exchange tube, thereby making the heat distribution more uniform, avoiding the occurrence of local overheating or overcooling, and making the heat exchange process more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of the overall structure of the embodiment;

[0022] Figure 2 Schematic diagram of the internal structure of the housing in the embodiment;

[0023] Figure 3 Schematic diagram of the structure of the moving parts in the embodiment;

[0024] Figure 4 Schematic diagram of the structure of the rotating component in the embodiment.

[0025] In the figure: 1. Shell; 2. Moving part; 3. Support column; 4. Exhaust pipe; 6. Heat exchange pipe; 7. Inlet pipe; 8. Gas flow meter; 9. Moving plate; 10. Limit block; 21. U-shaped frame; 22. First gear; 23. Second gear; 24. Screw; 51. L-shaped plate; 52. Third gear; 53. Ring gear; 54. Rotating disk; 61. Electric valve; 62. Rotary joint. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0027] This embodiment proposes a heat exchange device for a sodium silicate kiln, such as Figures 1 to 4 As shown, it includes a shell 1, an exhaust pipe 4 is inserted and connected to the left front end of the shell 1, an intake pipe 7 is inserted and connected to the right end of the shell 1, and a spiral heat exchange tube is arranged at the center of the interior of the shell 1 along its axial direction, and both ends of the heat exchange tube 6 extend to the outside of the shell 1 respectively.

[0028] During operation, the shell 1 is installed near the sodium carbonate kiln through the support column 3, the tail gas pipe of the sodium carbonate kiln is connected to the air inlet pipe 7, and the gas to be heated is transported to the heat exchange tube 6. When the exhaust gas contacts the heat exchange tube 6, the exhaust gas transfers its temperature to the air in the heat exchange tube 6, and finally the exhaust gas is discharged through the exhaust pipe 4. Finally, the heated air is transported to the sodium carbonate kiln. When the exhaust gas flow rate discharged from the sodium carbonate kiln is large, the volume of the shell 1 is too small, and the exhaust gas does not stay in the heat exchanger for a long time, resulting in insufficient heat exchange, or when the flow rate is small, the volume of the shell 1 is too large, resulting in low operating efficiency of the equipment.

[0029] In order to improve the above situation, two movable plates 9 are symmetrically arranged on both sides of the heat exchange tube 6 in the shell 1, and a heat exchange chamber is formed between the two movable plates 9 and the inner wall of the shell 1. The upper end of the air inlet pipe 7 is connected with a gas flow meter 8, and the flow rate of the exhaust gas is measured by the gas flow meter 8. The two ends of the heat exchange tube 6 extend to the outside of the shell 1 respectively. The upper and lower ends of the shell 1 are respectively equipped with movable parts 2, and the movable parts 2 are used to drive the movable plate 9 to move in the shell 1. The two movable parts 2 are symmetrically distributed up and down; the movable part 2 includes a U-shaped frame 21 installed on the shell 1, and a first motor is installed on the outside of the U-shaped frame 21. The motor shaft of the first motor extends to the inside of the U-shaped frame 21 and is fixedly sleeved with a first gear 22. The outside of the shell 1 is rotatably installed with a second gear 23 that meshes with the first gear 22. A screw rod 24 is fixedly connected to the movable plate 9, and the screw rod 24 extends to the outside of the shell 1 and is connected to the second gear 22. The second gear 23 is threadedly connected. When the volume of the heat exchange chamber needs to be changed, at least one of the two movable plates 9 moves in the shell 1. Of course, as a preferred embodiment, the two movable plates 9 can be made to move synchronously toward or away from each other inside the shell 1. When the gas flow meter 8 detects that the flow rate of gas at the intake pipe 7 increases, the first motor above is controlled to drive the corresponding first gear 22 to rotate, the first gear 22 drives the second gear 23 to rotate, the second gear 23 drives the screw rod 24 to move upward, and the screw rod 24 drives the movable plate 9 to move upward. Similarly, the movable plate 9 below is controlled to move downward, so that the volume of the heat exchange chamber becomes larger, thereby increasing the residence time of the exhaust gas in the heat exchange chamber and allowing the heat to be more fully absorbed. On the contrary, when it is detected that the flow rate of gas at the intake pipe 7 becomes smaller, the two movable plates 9 are controlled to approach each other through the moving component 2, reducing the volume of the heat exchange chamber so that the exhaust gas can fully contact the heat exchange tube 6.

[0030] In order to avoid collision between the movable plate 9 and the heat exchange tube 6, two limit blocks 10 symmetrically distributed up and down are installed on the left inner wall of the shell 1. The two limit blocks 10 are located between the two movable plates 9. The diameter of the heat exchange tube 6 is smaller than the distance between the two limit blocks 10. At the same time, the air intake pipe 7 and the exhaust pipe 4 are both located between the two limit blocks 10. The diameters of the air intake pipe 7 and the exhaust pipe 4 are smaller than the distance between the two limit blocks 10, ensuring that the gas can enter between the two movable plates 9.

[0031] In addition, in order to change the contact area between the exhaust gas and the wall of the heat exchange tube 6 and make the heat distribution more uniform, this embodiment chooses to rotatably connect the heat exchange tube 6 to the shell 1. The specific setting is: an L-shaped plate 51 is installed at the left end of the shell 1, and a second motor is installed on the outside of the L-shaped plate 51. The motor shaft of the second motor extends to the inside of the L-shaped plate 51 and is fixedly sleeved with a third gear 52. Rotating disks 54 are rotatably installed at both ends of the shell 1. The rotating disks 54 are fixedly sleeved with the heat exchange tube 6. An annular gear 53 is fixed on the outside of one of the rotating disks 54. The annular gear 53 is meshed with the third gear 52. The second motor is controlled to drive the third gear 52 to rotate, and the third gear 52 drives the annular gear 53. The annular gear 53 drives the rotating disk 54 on the left to rotate. The rotating disk 54 on the left drives the heat exchange tube 6 to rotate, which can continuously change the contact area between the exhaust gas and the wall of the heat exchange tube 6, thereby making the heat distribution more uniform, avoiding the occurrence of local overheating or overcooling, and making the heat exchange process more efficient.

[0032] Since the heat exchange tube 6 can rotate, a rotary joint 62 needs to be fixedly connected to the left and right ends of the heat exchange tube 6. The rotary joint 62 can be used to input gas into the heat exchange tube 6 and discharge gas from the heat exchange tube 6.

[0033] In addition, in order to control the opening of the heat exchange tube 6 , two electric valves 61 are provided on the heat exchange tube 6 , and the two electric valves 61 are respectively located on the left and right sides of the shell 1 .

[0034] In the description of this utility model, the terms "first," "second," "another," and "yet another" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more features. In the description of the embodiments of this utility model, "plurality" means two or more, unless otherwise specifically specified.

[0035] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances. In addition, in the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0036] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A heat exchange device for a sodium silicate kiln, comprising a housing (1), characterized in that: The front left portion of the housing (1) is connected to an exhaust pipe (4), the right end of the housing (1) is connected to an intake pipe (7), and the upper end of the intake pipe (7) is connected to a gas flow meter (8). A spiral heat exchange tube (6) is arranged at the center of the interior of the shell (1) along its axial direction. The two ends of the heat exchange tube (6) extend to the outside of the shell (1) respectively. Two movable plates (9) are symmetrically arranged on both sides of the heat exchange tube (6) in the shell (1). The two movable plates (9) and the inner wall of the shell (1) form a heat exchange chamber. The movable plates (9) move toward or away from each other in the shell (1) so that the volume of the heat exchange chamber changes with the change of the exhaust gas flow rate.

2. The heat exchange device for a sodium silicate kiln according to claim 1, characterized in that: The upper and lower ends of the housing (1) are both equipped with moving parts (2), and the moving parts (2) are used to drive the moving plate (9) to move within the housing (1). The two moving parts (2) are symmetrically distributed in the upper and lower parts. The moving component (2) includes a U-shaped frame (21) mounted on the housing (1), a first motor is mounted on the outside of the U-shaped frame (21), a motor shaft of the first motor extends to the inside of the U-shaped frame (21) and is fixedly sleeved with a first gear (22), a second gear (23) meshing with the first gear (22) is rotatably mounted on the outside of the housing (1), and a screw rod (24) is fixedly connected to the moving plate (9), and the screw rod (24) extends to the outside of the housing (1) and is threadedly connected to the second gear (23).

3. The heat exchange device for a sodium silicate kiln according to claim 1 or 2, characterized in that: At least one of the two movable plates (9) moves within the housing (1).

4. The heat exchange device for a sodium silicate kiln according to claim 1 or 2, characterized in that: The two moving plates (9) move synchronously towards or away from each other inside the housing (1).

5. The heat exchange device for a sodium silicate kiln according to claim 1, characterized in that: Two upper and lower symmetrically distributed limit blocks (10) are installed on the left inner wall of the housing (1), and the two limit blocks (10) are located between the two movable plates (9).

6. The heat exchange device for a sodium silicate kiln according to claim 1, characterized in that: The heat exchange tube (6) is rotatably connected to the shell (1).

7. The heat exchange device for a sodium silicate kiln according to claim 6, characterized in that: An L-shaped plate (51) is installed at the left end of the housing (1), and a second motor is installed on the outside of the L-shaped plate (51). The motor shaft of the second motor extends to the inside of the L-shaped plate (51) and is fixedly sleeved with a third gear (52). Rotating disks (54) are rotatably installed at both ends of the housing (1). The rotating disks (54) are fixedly sleeved with the heat exchange tube (6). An annular tooth (53) is fixed on the outside of one of the rotating disks (54), and the annular tooth (53) is meshed with the third gear (52).

8. The heat exchange device for a sodium silicate kiln according to claim 1, characterized in that: The left end and the right end of the heat exchange tube (6) are both fixedly connected to a rotary joint (62).

9. The heat exchange device for a sodium silicate kiln according to claim 1, characterized in that: Two electric valves (61) are provided on the heat exchange tube (6), and the two electric valves (61) are respectively located on the left and right sides of the shell (1).

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