Biomass boiler waste heat recovery device

Abstract

The utility model discloses a biomass boiler waste heat recovery device, which relates to the technical field of biomass boilers and comprises a boiler body, an exhaust pipe communicated with a heating chamber in the boiler body is fixed on the rear side of the boiler body, and a heat exchange water tank is arranged on the outer side of the boiler body. A water inlet pipe and a water outlet pipe which are communicated with an internal heated chamber are symmetrically fixed to the outer side of the boiler body, the end, away from the boiler body, of the water inlet pipe fixedly communicates with a heat exchange water tank, and the side, away from the water inlet pipe, of the heat exchange water tank fixedly communicates with a cold water pipe. A plurality of connecting pipes are evenly fixed between the two heat conduction plates, the exhaust pipe is fixed with the heat exchange water tank, and a tail gas pipe is fixed on the outer side of the heat exchange water tank. And meanwhile, the energy required by the cold water entering the boiler body to be heated to the specified temperature is reduced.

Description

Technical Field

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

[0002] Biomass boiler is a type of boiler. A boiler that uses biomass energy as fuel is called a biomass boiler. It is divided into biomass steam boiler, biomass hot water boiler, biomass hot air boiler, biomass thermal oil boiler, vertical biomass boiler, horizontal biomass boiler, etc.

[0003] During the use of biomass boilers, the flue gas generated by the combustion of biomass inside the boiler is directly discharged through the exhaust pipe. The flue gas carries a large amount of heat, and direct discharge will cause a waste of heat in the flue gas. For this reason, we propose a biomass boiler waste heat recovery device. Utility Model Content

[0004] The purpose of the present invention is to provide a biomass boiler waste heat recovery device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a biomass boiler waste heat recovery device, comprising a boiler body, an exhaust pipe connected to a heating chamber inside the boiler body is fixed on the rear side of the boiler body, a heat exchange water tank is provided on the outside of the boiler body, an inlet pipe and an outlet pipe connected to the internal heated chamber are symmetrically fixed on the outside of the boiler body, one end of the inlet pipe away from the boiler body is fixedly connected to the heat exchange water tank, and a cold water pipe is fixedly connected to the side of the heat exchange water tank away from the inlet pipe, two symmetrically distributed heat conduction plates are provided in the heat exchange water tank, a plurality of connecting pipes are evenly fixed between the two heat conduction plates, two ends of the connecting pipes are respectively connected to the internal space of the heat exchange water tank, one end of the exhaust pipe away from the boiler body is fixed to the heat exchange water tank, and an exhaust pipe is fixed on the side of the heat exchange water tank away from the exhaust pipe. The utility model passes hot flue gas into the heat exchange water tank, uses the waste heat of the flue gas to preheat the cold water in the heat exchange water tank, recovers and utilizes the waste heat of the flue gas, and at the same time reduces the energy required for the cold water to be heated to a specified temperature when entering the boiler body.

[0006] Preferably, a water pump is fixed to one end of the cold water pipe close to the heat exchange water tank. Installing the water pump on the cold water pipe instead of the water inlet pipe allows cold water to fill the heat exchange water tank, thereby improving the utilization of waste heat from flue gas.

[0007] Preferably, the height of the water inlet pipe is greater than that of the cold water pipe. The water inlet pipe is located outside the top of the heat exchange water tank, and the cold water pipe is located outside the bottom of the heat exchange water tank, so that the cold water can fill the heat exchange water tank conveniently.

[0008] Preferably, the middle section of the connecting pipe is a spiral pipe, which increases the contact area between the flue gas and the cold water in the connecting pipe, thereby improving the heat exchange effect.

[0009] Preferably, the connection points between the exhaust pipe and the tail gas pipe and the heat exchange water tank are located between the two heat conduction plates to avoid direct contact between the flue gas and the cold water and contamination of the cold water.

[0010] Preferably, limiting grooves are symmetrically fixed inside the heat exchange water tank, and the two sides of the heat conduction plate are slidably engaged with the limiting grooves. A cover is provided at the top opening of the heat exchange water tank, and the tops of the two heat conduction plates are fixed to the bottom of the cover, making it convenient to remove the heat conduction plates and connecting pipes for cleaning.

[0011] Preferably, evenly distributed partitions are fixed between the two heat conducting plates, and connecting ports are provided at the ends of the partitions. Of the two adjacent connecting ports, one is located at the top of the heat conducting plate and the other is located at the bottom of the heat conducting plate, thereby increasing the travel distance of the flue gas in the heat exchange water tank and thereby improving the heat exchange time between the flue gas and the cold water.

[0012] Preferably, a drain pipe equipped with a valve is fixed to the outside of the bottom of the heat exchange water tank to facilitate the discharge of waste water remaining in the heat exchange water tank when cleaning the heat exchange water tank.

[0013] Compared with traditional technology, the beneficial effects of this utility model are:

[0014] 1. By passing hot flue gas into the heat exchange water tank, the waste heat of the flue gas is used to preheat the cold water in the heat exchange water tank, thereby recycling the waste heat of the flue gas and reducing the energy required for the cold water to enter the boiler body and be heated to the specified temperature;

[0015] 2. By designing the connecting pipe in contact with the flue gas as a spiral tube, the heat exchange area between the flue gas and the cold water in the spiral tube can be greatly increased, so that more waste heat in the flue gas can enter the cold water, thereby improving the waste heat recovery effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the heat exchange water tank of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the heat conducting plate of the utility model;

[0019] Figure 4 This is a schematic cross-sectional view of the interior of the heat exchange water tank of the present invention.

[0020] In the figure: 1- boiler body; 2- exhaust pipe; 3- heat exchange water tank; 4- water inlet pipe; 5- cold water pipe; 6- heat conduction plate; 7- connecting pipe; 8- tail gas pipe; 9- water pump; 10- limit groove; 11- sealing cover; 12- partition; 13- connecting port; 14- drain pipe; 15- outlet pipe. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Example:

[0023] See also Figure 1-Figure 4 The figure shows a waste heat recovery device for a biomass boiler, comprising a boiler body 1, an exhaust pipe 2 connected to the internal heating chamber of the boiler body 1 fixed to the rear side of the boiler body 1, a heat exchange water tank 3 provided on the outside of the boiler body 1, an inlet pipe 4 and an outlet pipe 15 connected to the internal heated chamber symmetrically fixed to the outside of the boiler body 1, the inlet pipe 4 is fixedly connected to the heat exchange water tank 3 at one end away from the boiler body 1, a cold water pipe 5 is fixedly connected to the side of the heat exchange water tank 3 away from the inlet pipe 4, two symmetrically distributed heat conduction plates 6 are provided in the heat exchange water tank 3, a plurality of connecting pipes 7 are evenly fixed between the two heat conduction plates 6, both ends of the connecting pipes 7 are respectively connected to the internal space of the heat exchange water tank 3, the exhaust pipe 2 is fixed to the heat exchange water tank 3 at one end away from the boiler body 1, and a tail gas pipe 8 is fixed to the side of the heat exchange water tank 3 away from the exhaust pipe 2.

[0024] Some embodiments of the present application are described in detail below with reference to the accompanying drawings:

[0025] See also Figure 1-Figure 4 By passing the hot flue gas into the heat exchange water tank 3, the waste heat of the flue gas is used to preheat the cold water in the heat exchange water tank 3, the waste heat of the flue gas is recovered and utilized, and at the same time the energy required for the cold water to enter the boiler body 1 and be heated to the specified temperature is reduced.

[0026] Among them, such as Figure 2 As shown, the connection points between the exhaust pipe 2 and the tail gas pipe 8 and the heat exchange water tank 3 are all located between the two heat conduction plates 6 to avoid direct contact between the flue gas and the cold water and contamination of the cold water. A water pump 9 is fixed to one end of the cold water pipe 5 close to the heat exchange water tank 3. The height of the water inlet pipe 4 is greater than that of the cold water pipe 5. The water inlet pipe 4 is located on the outside of the top of the heat exchange water tank 3, and the cold water pipe 5 is located on the outside of the bottom of the heat exchange water tank 3. The water pump 9 is installed on the cold water pipe 5 instead of on the water inlet pipe 4. At the same time, the position of the water inlet of the water inlet pipe 4 is higher than the position of the water outlet of the cold water pipe 5, so that the cold water can fill the heat exchange water tank 3, which can increase the contact area between the flue gas and the cold water, thereby improving the utilization effect of the waste heat of the flue gas.

[0027] Further, such as Figure 2As shown, the middle section of the connecting pipe 7 is a spiral pipe, which can further increase the contact area between the flue gas and the cold water in the connecting pipe 7, thereby improving the heat exchange effect.

[0028] It is worth noting that Figure 4 As shown, evenly distributed partitions 12 are fixed between the two heat conducting plates 6, and connecting ports 13 are provided at the ends of the partitions 12. Among the two adjacent connecting ports 13, one is located at the top of the heat conducting plate 6 and the other is located at the bottom of the heat conducting plate 6, thereby increasing the travel distance of the flue gas in the heat exchange water tank 3, thereby improving the heat exchange time between the flue gas and the cold water.

[0029] The hot flue gas generated by the heating chamber of the boiler body 1 enters the heat exchange water tank 3 through the exhaust pipe 2, and is turned back through the partition 12 to increase the retention time of the flue gas in the heat exchange water tank 3, and is finally discharged from the tail pipe 8. At this time, cold water is pumped into the heat exchange water tank 3 through the cold water pipe 5 under the action of the water pump 9. Due to the presence of two heat conducting plates 6, the cold water entering the heat exchange water tank 3 reaches the other side of the heat exchange water tank 3 through the connecting pipe 7. In this process, the waste heat of the flue gas enters the cold water inside the connecting pipe 7 to complete the heat exchange. As the water level in the heat exchange water tank 3 rises, when the water level reaches the water inlet of the water inlet pipe 4, the water preheated by the waste heat of the flue gas enters the boiler body 1 through the water inlet pipe 4 and continues to be heated by the boiler body 1.

[0030] See also Figure 2-Figure 4 In this embodiment, the heat exchange water tank 3 is symmetrically fixed with limiting grooves 10, and the two sides of the heat conducting plate 6 are slidably engaged with the limiting grooves 10. A cover 11 is provided at the top opening of the heat exchange water tank 3, and the tops of the two heat conducting plates 6 are fixed to the bottom of the cover 11, which makes it convenient to take out the heat conducting plates 6 and the connecting pipes 7 for cleaning.

[0031] At the same time, a drain pipe 14 equipped with a valve is fixed to the outside of the bottom of the heat exchange water tank 3, which is convenient for draining the waste water remaining in the heat exchange water tank 3 when cleaning the heat exchange water tank 3.

[0032] Since the outer sides of the heat exchange water tank 3 are covered with a thermal insulation layer, the heat of the water in the heat exchange water tank 3 can be reduced from being dissipated into the outside air.

[0033] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but may also include other elements not explicitly listed, or may also include elements that are inherent to such process, method, article, or apparatus.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A biomass boiler waste heat recovery device, characterized in that: include: A boiler body (1) is provided, wherein an exhaust pipe (2) communicating with an internal heating chamber of the boiler body (1) is fixed on the rear side of the boiler body (1), a heat exchange water tank (3) is provided on the outside of the boiler body (1), a water inlet pipe (4) and a water outlet pipe (15) communicating with an internal heated chamber are symmetrically fixed on the outside of the boiler body (1), the end of the water inlet pipe (4) away from the boiler body (1) is fixedly connected with the heat exchange water tank (3), the side of the heat exchange water tank (3) away from the water inlet pipe (4) is fixedly connected with a cold water pipe (5), two symmetrically distributed heat conduction plates (6) are provided in the heat exchange water tank (3), a plurality of connecting pipes (7) are evenly fixed between the two heat conduction plates (6), the two ends of the connecting pipes (7) are respectively connected with the internal space of the heat exchange water tank (3), the end of the exhaust pipe (2) away from the boiler body (1) is fixed with the heat exchange water tank (3), and the side of the heat exchange water tank (3) away from the exhaust pipe (2) is fixed with a tail gas pipe (8).

2. A biomass boiler waste heat recovery device according to claim 1, characterized in that: A water pump (9) is fixed to one end of the cold water pipe (5) close to the heat exchange water tank (3).

3. The biomass boiler waste heat recovery device according to claim 1, characterized in that: The height of the water inlet pipe (4) is greater than that of the cold water pipe (5); the water inlet pipe (4) is located outside the top of the heat exchange water tank (3); and the cold water pipe (5) is located outside the bottom of the heat exchange water tank (3).

4. The biomass boiler waste heat recovery device according to claim 1, characterized in that: The middle section of the connecting tube (7) is a spiral tube.

5. The biomass boiler waste heat recovery device according to claim 2, characterized in that: The connection points between the exhaust pipe (2) and the tail gas pipe (8) and the heat exchange water tank (3) are both located between the two heat conduction plates (6).

6. The biomass boiler waste heat recovery device according to claim 1, characterized in that: The heat exchange water tank (3) has symmetrically fixed limiting grooves (10), and both sides of the heat conduction plates (6) are slidably engaged with the limiting grooves (10). A cover (11) is provided at the top opening of the heat exchange water tank (3), and the tops of the two heat conduction plates (6) are fixed to the bottom of the cover (11).

7. The biomass boiler waste heat recovery device according to claim 1, characterized in that: A partition plate (12) is evenly distributed and fixed between the two heat conducting plates (6). A communication port (13) is provided at the end of the partition plate (12). Of the two adjacent communication ports (13), one is located at the top of the heat conducting plate (6) and the other is located at the bottom of the heat conducting plate (6).

8. The biomass boiler waste heat recovery device according to claim 1, characterized in that: A drain pipe (14) equipped with a valve is fixed to the outside of the bottom of the heat exchange water tank (3).

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