Boiler waste heat gradient utilization heat recovery device

Abstract

The utility model provides a boiler waste heat gradient utilization heat recovery device which comprises a heat exchange box, a first water storage tank arranged at the top of the inner side of the heat exchange box, a second water storage tank arranged at the bottom of the inner side of the heat exchange box and a heat conduction tank arranged between the first water storage tank and the second water storage tank. The heat conduction plates are arranged on the two sides of the heat conduction groove, and the two ends of the U-shaped heat exchange plate are embedded into the first water storage groove and the second water storage groove correspondingly. The interior of the heat conduction groove communicates with the interior of the first water storage groove and the interior of the second water storage groove. And one side of the heat conducting plate is embedded into the heat conducting groove. And a heat exchange cavity is formed in the U-shaped heat exchange plate. High-temperature sewage generated by the boiler is introduced into the first water storage tank and the second water storage tank, domestic water in the heat exchange cavity is heated, and primary heat recycling is achieved. And then air flow entering the heat exchange box is heated through the heat conduction plate, the heated hot air flow is used for daily life, and secondary heat recycling is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler waste heat recovery, in particular to a boiler waste heat cascade utilization heat recovery device. Background Art

[0002] Steam condensate recovery as an important energy-saving measure for boiler users has been increasingly recognized and acknowledged, especially in papermaking, chemical, food, pharmaceutical, grain and oil processing, printing and dyeing, wood processing and other processing and manufacturing industries.

[0003] In existing condensate reflux production equipment, the wastewater generated by the boiler is generally discharged directly into the ditch, which causes heat waste. There is a lack of a heat recovery device that can recover and fully utilize the waste heat of the boiler. Utility Model Content

[0004] The utility model aims to provide a boiler waste heat cascade utilization heat recovery device, which can solve the problem that the boiler waste heat recovery cannot be fully utilized.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A heat recovery device for cascade utilization of waste heat from a boiler, comprising a heat exchange box 1, a first water storage tank 2 arranged at the inner top of the heat exchange box 1, a second water storage tank 3 arranged at the inner bottom of the heat exchange box 1, a heat conduction tank 4 arranged between the first water storage tank 2 and the second water storage tank 3, a plurality of heat conduction plates 5 arranged on both sides of the heat conduction tank 4, and a U-shaped heat exchange plate 6 with both ends respectively embedded in the first water storage tank 2 and the second water storage tank 3. The interior of the heat conduction tank 4 is connected to the interior of the first water storage tank 2 and the interior of the second water storage tank 3. One side of the heat conduction plate 5 is embedded in the interior of the heat conduction tank 4. A heat exchange cavity 61 is arranged inside the U-shaped heat exchange plate 6.

[0007] Preferably, an air outlet 11 and an air inlet 12 are respectively provided on both sides of the heat exchange box 1, and the air outlet 11 and the air inlet 12 are both of a constricted structure.

[0008] Preferably, an activated carbon plate 7 is provided on one side of the heat exchange box 1 close to the air outlet 11 ; and a blowing device 8 is provided inside the air inlet 12 .

[0009] Preferably, the blowing device 8 includes a motor 81 , a fan blade 82 connected to an output end of the motor 81 , and a support rod 83 for fixing the motor 81 inside the air inlet 12 .

[0010] Preferably, the heat exchange chamber 61 is isolated from the interior of the first water storage tank 2 and the second water storage tank 3. A first water outlet pipe 62 is provided at the top of the U-shaped heat exchange plate 6, and a first water inlet pipe 63 is provided at the bottom. The first water outlet pipe 62 and the first water inlet pipe 63 are both in communication with the heat exchange chamber 61. The first water outlet pipe 62 and the first water inlet pipe 63 pass through the inner wall of the heat exchange box 1 and are connected to an external water pipe.

[0011] Preferably, a second water outlet pipe 21 is provided at the top of the first water storage tank 2. A second water inlet pipe 31 is provided at the bottom of the second water storage tank 3. Both the second water outlet pipe 21 and the second water inlet pipe 31 pass through the inner wall of the heat exchange box 1 and are connected to an external water pipe.

[0012] Preferably, the U-shaped heat exchange plate 6 is made of stainless steel.

[0013] The utility model heats the domestic water in the heat exchange chamber by passing the high-temperature sewage generated by the boiler into the first water storage tank and the second water storage tank, thereby realizing primary heat recovery. Then, the airflow entering the heat exchange box is heated by the heat conduction plate, and the heated hot airflow is used in daily life, thereby realizing secondary heat recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of a boiler waste heat cascade utilization heat recovery device of the utility model.

[0015] Figure 2 for Figure 1 Structural diagram of other structures installed inside the heat exchanger box.

[0016] Figure 3 for Figure 1 Schematic diagram of the cross section of the heat exchange box in the AA direction.

[0017] Figure 4 for Figure 1 Schematic diagram of the cross section of the heat exchange box in the BB direction.

[0018] The following are the descriptions of the reference numerals:

[0019] 1: heat exchange box, 2: first water storage tank, 3: second water storage tank, 4: heat conduction tank, 5: heat conduction plate, 6: U-shaped heat exchange plate, 7: activated carbon plate, 8: blowing device, 11: air outlet, 12: air inlet, 21: second water outlet pipe, 31: second water inlet pipe, 61: heat exchange chamber, 62: first water outlet pipe, 63: second water outlet pipe, 81: motor, 82: fan blades, 83: support rod. DETAILED DESCRIPTION

[0020] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0021] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand the advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0022] Embodiment 1

[0023] The utility model heats the domestic water in the heat exchange chamber by passing the high-temperature sewage generated by the boiler into the first water storage tank and the second water storage tank, thereby realizing primary heat recovery. Then, the airflow entering the heat exchange box is heated by the heat conduction plate, and the heated hot airflow is used in daily life, thereby realizing secondary heat recovery.

[0024] like Figure 1-2 As shown, a boiler waste heat cascade utilization heat recovery device comprises a heat exchange box 1, a first water storage tank 2 arranged at the inner top of the heat exchange box 1, a second water storage tank 3 arranged at the inner bottom of the heat exchange box 1, a heat conduction tank 4 arranged between the first water storage tank 2 and the second water storage tank 3, a plurality of heat conduction plates 5 arranged on both sides of the heat conduction tank 4, and a U-shaped heat exchange plate 6 whose two ends are respectively embedded in the first water storage tank 2 and the second water storage tank 3. The interior of the heat conduction tank 4 is connected to the interior of the first water storage tank 2 and the interior of the second water storage tank 3. One side of the heat conduction plate 5 is embedded in the interior of the heat conduction tank 4.

[0025] like Figure 4 As shown, a heat exchange cavity 61 is provided inside the U-shaped heat exchange plate 6. Furthermore, the heat exchange cavity 61 is isolated from the inside of the first water storage tank 2 and the second water storage tank 3. A first water outlet pipe 62 is provided on the top of the U-shaped heat exchange plate 6, and a first water inlet pipe 63 is provided on the bottom. The first water outlet pipe 62 and the first water inlet pipe 63 are both connected to the heat exchange cavity 61. The first water outlet pipe 62 and the first water inlet pipe 63 pass through the inner wall of the heat exchange box 1 and are connected to the external water pipe, and valves can also be provided to control the inflow and outflow of water. Furthermore, the U-shaped heat exchange plate 6 is made of stainless steel. Since the heated water is used in daily life, the U-shaped heat exchange plate 6 is prevented from being rusted or having other structural damages due to long-term heating and contact with water, thereby polluting the domestic water. The material of the U-shaped heat exchange plate 6 is stainless steel.

[0026] In this embodiment, the first water inlet pipe 63 is located at the bottom of the entire heat exchange box 1, which allows domestic water to enter from the lower part of the U-shaped heat exchange plate 6 and flow out from the higher part, so that the domestic water can stay in the heat exchange chamber 61 for a longer time, thereby increasing the heating time.

[0027] like Figure 3 As shown, further, an air outlet 11 and an air inlet 12 are respectively provided on both sides of the heat exchange box 1, and the air outlet 11 and the air inlet 12 are both of a contracted structure.

[0028] In this embodiment, the air outlet 11 and the air inlet 12 are both of a contracted structure so that the internal space of the heat exchange box 1 is relatively larger than the space of the air outlet 11 and the air inlet 12. When the airflow enters the interior of the heat exchange box 1, the airflow velocity decreases due to the increase in the space through which the airflow passes, and the airflow can stay in the interior of the heat exchange box 1 for a longer time, and the heat conducting plate 5 has a longer time to heat the airflow. At the same time, the volume of the airflow increases after being heated inside the heat exchange box 1, and the internal air pressure of the heat exchange box 1 is relatively large. At this time, the space of the air outlet 11 is relatively small relative to the internal space of the heat exchange box 1, and the airflow can quickly flow out from the air outlet 11.

[0029] Furthermore, an activated carbon plate 7 is provided on one side of the heat exchange box 1 near the air outlet 11. There are many ways to install the activated carbon plate 7 inside the heat exchange box 1. A frame can be fixed inside the heat exchange box 1 to install the activated carbon plate 7, or the activated carbon plate 7 can be directly placed inside the heat exchange box 1 and clamped to the inner wall of the heat exchange box 1 during the equipment production process. A blowing device 8 is provided inside the air inlet 12. Furthermore, the blowing device 8 includes a motor 81, a fan blade 82 connected to the output end of the motor 81, and a support rod 83 for fixing the motor 81 inside the air inlet 12.

[0030] In this embodiment, the motor 81 drives the fan blades 82 to rotate, and the fan blades 82 blow the airflow into the interior of the heat exchange box 1, and the airflow contacts the heat conduction plate 5 to be heated.

[0031] Furthermore, a second water outlet pipe 21 is provided at the top of the first water storage tank 2. A second water inlet pipe 31 is provided at the bottom of the second water storage tank 3. Both the second water outlet pipe 21 and the second water inlet pipe 31 pass through the inner wall of the heat exchange box 1 and are connected to an external water pipe, and a valve may be provided to control the inflow and outflow of water.

[0032] In this embodiment, the second water inlet pipe 31 is located at the bottom of the second water storage tank 3, which allows the high-temperature sewage generated by the boiler to flow from the bottom to the top of the heat conduction tank 4. The high-temperature sewage can have a longer residence time inside the heat conduction tank 4, so that it can have a longer time to transfer heat to the heat conduction plate 5, so that the heat can be fully dissipated.

[0033] Working principle:

[0034] The high-temperature sewage generated by the boiler is introduced into the second water storage tank 3 from the second water inlet pipe 31. At the same time, the motor 81 is started and the domestic water is introduced into the heat exchange chamber 61 from the first water inlet pipe 63. In this process, the high-temperature sewage flows from the second water storage tank 3 through the heat conduction groove 4 to the first water storage tank 2, and then flows out from the second water outlet pipe 21. During the flow, the heat of the high-temperature sewage is transferred to the outside of the heat conduction groove 4 through the heat conduction plate 5, and fully contacts with the internal air flow of the heat exchange box 1, thereby heating the internal air flow of the heat exchange box 1. The blowing device 8 continuously blows the cold air outside the heat exchange box 1 into the inside of the heat exchange box 1, and the heated air flow inside the heat exchange box 1 is discharged from the air outlet 11 for household heating, drying clothes or dehumidification. After heat transfer in the heat exchange chamber 61, the domestic water is discharged from the first water outlet pipe 62 for daily washing or showering.

[0035] In the description of the present invention, it should be understood that the terms "middle", "length", "up", "down", "front", "back", "vertical", "horizontal", "inside", "outside", "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 device or element referred to 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.

[0036] In the present invention, unless otherwise clearly specified and limited, the first feature "on" 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. "Multiple" means at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0037] 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 one; it can be a mechanical connection, an electrical connection, or communication with each other; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The above is only for explaining the implementation mode of the utility model and is not used to limit the utility model. For those skilled in the art, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the utility model without creative work should be included in the protection scope of the utility model.

Claims

1. A boiler waste heat cascade utilization heat recovery device, characterized in that: The invention comprises a heat exchange box (1), a first water storage tank (2) arranged at the top of the inner side of the heat exchange box (1), a second water storage tank (3) arranged at the bottom of the inner side of the heat exchange box (1), a heat conduction tank (4) arranged between the first water storage tank (2) and the second water storage tank (3), a plurality of heat conduction plates (5) arranged at both sides of the heat conduction tank (4), and a U-shaped heat exchange plate (6) with both ends respectively embedded in the first water storage tank (2) and the second water storage tank (3); the interior of the heat conduction tank (4) is connected to the interior of the first water storage tank (2) and the interior of the second water storage tank (3); one side of the heat conduction plate (5) is embedded in the interior of the heat conduction tank (4); and a heat exchange cavity (61) is provided in the interior of the U-shaped heat exchange plate (6).

2. A boiler waste heat cascade utilization heat recovery device as claimed in claim 1, characterized in that: An air outlet (11) and an air inlet (12) are respectively arranged on both sides of the heat exchange box (1), and the air outlet (11) and the air inlet (12) are both of a constricted structure.

3. A boiler waste heat cascade utilization heat recovery device as claimed in claim 2, characterized in that: An activated carbon plate (7) is provided on one side of the interior of the heat exchange box (1) close to the air outlet (11); and a blowing device (8) is provided inside the air inlet (12).

4. A boiler waste heat cascade utilization heat recovery device as claimed in claim 3, characterized in that: The blowing device (8) comprises a motor (81), a fan blade (82) connected to the output end of the motor (81), and a support rod (83) for fixing the motor (81) inside the air inlet (12).

5. The boiler waste heat cascade utilization heat recovery device as claimed in claim 1, characterized in that: The heat exchange chamber (61) is isolated from the interior of the first water storage tank (2) and the second water storage tank (3); a first water outlet pipe (62) is arranged on the top of the U-shaped heat exchange plate (6), and a first water inlet pipe (63) is arranged on the bottom; the first water outlet pipe (62) and the first water inlet pipe (63) are both in communication with the heat exchange chamber (61); the first water outlet pipe (62) and the first water inlet pipe (63) pass through the inner wall of the heat exchange box (1) and are connected to an external water pipe.

6. A boiler waste heat cascade utilization heat recovery device as claimed in claim 1, characterized in that: A second water outlet pipe (21) is arranged at the top of the first water storage tank (2); a second water inlet pipe (31) is arranged at the bottom of the second water storage tank (3); the second water outlet pipe (21) and the second water inlet pipe (31) both pass through the inner wall of the heat exchange box (1) and are connected to an external water pipe.

7. A boiler waste heat cascade utilization heat recovery device as claimed in claim 1, characterized in that: The U-shaped heat exchange plate (6) is made of stainless steel.

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