Energy-saving device utilizing waste heat and waste gas of roasting furnace

Abstract

The utility model discloses an energy-saving device utilizing residual heat and residual gas of a roasting furnace. The energy-saving device solves the problems that in the prior art, the heat storage mode of the residual heat and residual gas of the roasting furnace is single, and the utilization efficiency of the residual heat is poor. The energy-saving device utilizing the waste heat and the waste gas of the roasting furnace comprises a heat insulation box communicated with the roasting furnace through a first pipeline, a heat exchange water tank and a heat storage box are arranged in the heat insulation box, and the first pipeline is communicated with a gas inlet pipeline arranged in the heat insulation box through a first filtering mechanism. The air inlet pipeline is connected with the heat exchange water tank and the heat storage tank through a three-way pipe. The heat exchange water tank and the heat storage tank are used for collecting and recycling heat energy of waste heat and waste gas of the roasting furnace, so that the heat energy collection amount is increased; the heat exchange water tank can heat smoke heat energy and recycle water vapor, energy loss is reduced, and the waste heat utilization rate is increased; according to the energy-saving device utilizing the waste heat and the waste gas of the roasting furnace, the heat storage mode of the waste heat and the waste gas of the roasting furnace is enriched, and the waste heat utilization efficiency is further improved.

Description

Technical Field

[0001] This utility model relates to the field of energy-saving technology for roasting furnaces, and in particular to an energy-saving device that utilizes the waste heat and waste gas of roasting furnaces. Background Technology

[0002] Roasting furnaces generate flue gas during operation. Currently, there are two main methods for treating this flue gas: direct discharge and waste heat recovery devices. Direct discharge not only impacts the surrounding environment but also wastes resources. Waste heat recovery devices can directly absorb heat from the flue gas for heat exchange. However, current waste heat recovery devices have limited heat exchange methods and limited heat storage capacity, which affects the efficiency of waste heat recovery to some extent.

[0003] In existing technologies, such as the energy-saving device utilizing waste heat and gas from a roasting furnace disclosed in CN 219531698 U, the waste heat and gas from the roasting furnace are introduced into a heat exchange chamber through an exhaust pipe. The heat from the waste heat is then collected by several heat exchange fins onto a heat absorption tube. Water flows through the heat absorption tube and absorbs the waste heat from the waste heat, achieving energy savings. Although this device can convert waste heat from the waste heat into water for heat storage, this heat storage method is singular, and its processing efficiency is limited when dealing with large amounts of waste heat waste gas. Furthermore, the form of stored heat is fixed, and its subsequent utilization is limited. Utility Model Content

[0004] To address the shortcomings in the aforementioned background technology, this utility model proposes an energy-saving device that utilizes the waste heat and waste gas of a roasting furnace, thus solving the problem of the single heat storage method and poor waste heat utilization efficiency in the existing technology.

[0005] The technical solution of this utility model is implemented as follows: an energy-saving device that utilizes the waste heat and waste gas of a roasting furnace includes a heat insulation box connected to the roasting furnace through a first pipe. The heat insulation box is equipped with a heat exchange water tank and a heat storage tank. The first pipe is connected to an air inlet pipe installed in the heat insulation box through a first filter mechanism. The air inlet pipe is connected to the heat exchange water tank and the heat storage tank through a three-way pipe.

[0006] Further preferably, the first filtration mechanism includes an outer heat insulation sleeve disposed inside a heat insulation box, a detachable cylindrical filter screen disposed inside the outer heat insulation sleeve, and staggered guide mesh plates disposed inside the cylindrical filter screen. A first pipe is connected to the outer heat insulation sleeve and corresponds to the inlet end of the cylindrical filter screen. An exhaust port connected to the air inlet pipe is provided at the upper part of the outer heat insulation sleeve.

[0007] In a further preferred embodiment, the outer wall of the cylindrical filter screen is provided with a positioning ring, and the positioning ring has a slot that cooperates with a positioning protrusion provided on the inner wall of the outer heat insulation sleeve.

[0008] Further preferably, the heat exchange water tank is equipped with an S-shaped heat exchange pipe. The air inlet end of the heat exchange pipe is connected to a three-way pipe through a first air inlet branch pipe, and the air outlet end of the heat exchange pipe extends out of the heat insulation box through a first air outlet pipe. A flow valve is provided on the first air inlet branch pipe, and a temperature sensor is provided on the heat exchange water tank.

[0009] In a further preferred embodiment, the heat exchange water tank is provided with a steam hopper at the top, which is connected to a drying pipe installed on the heat insulation box. A drying box for placing desiccant is detachably installed inside the drying pipe. The drying pipe is connected to an air pump installed on the heat insulation box, and the air pump is connected to the roasting furnace through an addition pipe.

[0010] Further preferably, the inner wall of the steam hopper is provided with a condensation groove, which is a strip groove or spiral groove arranged along the conical surface of the steam hopper.

[0011] In a further preferred embodiment, the heat storage box includes a heat storage box body, which is divided into an upper cavity and a lower cavity by a partition. At least two outer cylinders are arranged side by side in the upper cavity, and the heat storage medium is stored in the lower cavity. A second filtration mechanism is provided in the outer cylinders, and the outer cylinders are connected to a three-way pipe through a second air inlet branch pipe. Part of the gas medium filtered by the second filtration mechanism is connected to the external preheating pipe through a second exhaust pipe, and part of it flows to the heat storage medium.

[0012] In a further preferred embodiment, the second filtration mechanism includes a filter inner cylinder rotatably disposed within the outer cylinder, the filter inner cylinder being connected to the second air intake branch pipe via a rotary joint, and a spiral guide vane being provided on the inner wall of the filter inner cylinder.

[0013] Preferably, the bottom of the outer cylinder is provided with a guide pipe, which extends through the partition to the lower cavity and contacts the heat storage medium inside the lower cavity. A grid box is provided inside the lower cavity, and the heat storage medium is placed inside the grid box.

[0014] The beneficial effects of this utility model are as follows: This utility model uses a heat exchange water tank and a heat storage tank to collect and reuse the thermal energy of the waste heat and waste gas from the roasting furnace, increasing the amount of thermal energy collected; moreover, the heat exchange water tank can reuse the heat energy of the flue gas by heating water and steaming, reducing energy loss and improving the waste heat utilization rate; the heat storage tank uses a replaceable heat storage medium to continuously store the heat energy of the flue gas, and the heat stored in the heat storage medium can be reused more flexibly. Therefore, this utility model uses parallel heat exchange water tanks and heat storage tanks to achieve free selection of waste heat storage methods. Through the above structural settings, this utility model's energy-saving device for utilizing the waste heat and waste gas from the roasting furnace enriches the heat storage methods for the waste heat and waste gas from the roasting furnace, further improving the waste heat utilization efficiency.

[0015] The first filtration mechanism of this invention features a cylindrical filter screen with staggered guide mesh plates inside. These guide mesh plates increase the contact area between the mesh plates and the flue gas, improving the filtration effect. The second filtration mechanism has spiral guide plates on the inner wall of the filter cylinder. The waste heat flue gas entering the filter cylinder contacts the spiral guide plates at a certain speed, pushing them and causing the filter cylinder to rotate. This achieves dynamic filtration, reduces localized ash and slag accumulation, extends the service life of the filter cylinder, and lowers production costs. Attached Figure Description

[0016] To more clearly illustrate the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a partial schematic diagram of the first filtration mechanism of this utility model;

[0019] Figure 3 This is a schematic diagram showing the connection between the cylindrical filter screen and the external heat insulation sleeve.

[0020] Figure 4 This is a schematic diagram of the internal structure of the thermal storage box;

[0021] Figure 5 This is a side view of the thermal storage box in Example 3. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1As shown in Embodiment 1, an energy-saving device utilizing waste heat and gas from a roasting furnace includes an insulated box 2 connected to the roasting furnace 10 via a first pipe 1. The insulated box can be made of heat-insulating material to insulate the waste heat and gas entering the box, preventing heat loss. The insulated box 2 contains a heat exchange water tank 3 and a heat storage tank 4. The heat exchange water tank stores the waste heat and gas from the roasting furnace in water, i.e., heats the water, thus utilizing the waste heat and gas. The heat exchange water tank, which holds the water medium, represents the first method of recovering and utilizing waste heat and gas from the roasting furnace. The heat storage tank 4 stores heat using a heat storage medium such as sand or gravel. This medium can be replaced after reaching a certain temperature, enabling continuous utilization and storage of the waste heat and gas from the roasting furnace. Furthermore, the stored heat medium can be used for preheating roasted parts, drying other workpieces, etc., making its use more flexible. In this embodiment, the first pipe 1 is connected to the air inlet pipe 5 located inside the heat insulation box 2 via the first filter mechanism 6. The first filter mechanism is used to filter the flue gas entering the air inlet pipe, reducing the amount of dust in the flue gas entering the heat exchange water tank 3 and the heat storage box 4. The air inlet pipe 5 is connected to the heat exchange water tank 3 and the heat storage box 4 via a three-way pipe 7. The heat exchange water tank and the heat storage box are arranged in parallel, allowing for free selection of the waste heat storage method. Through the above structural arrangement, the energy-saving device of this utility model utilizing the waste heat and waste gas of the roasting furnace enriches the waste heat and waste gas storage methods of the roasting furnace and further improves the waste heat utilization efficiency.

[0024] Example 2, as Figure 2 As shown, an energy-saving device utilizing waste heat and gas from a roasting furnace is further optimized based on Embodiment 1. In this embodiment, the first filtration mechanism 6 includes an outer heat insulation sleeve 61 disposed within the heat insulation box 2. A cylindrical filter screen 62 is detachably disposed within the outer heat insulation sleeve 61. The cylindrical filter screen 62 and the outer heat insulation sleeve are coaxially aligned, and their detachable connection facilitates the replacement of the cylindrical filter screen 62. The cylindrical filter screen 62 has a blind cylinder structure, i.e., one end is open and the other end is closed, ensuring sufficient filtration of flue gas entering from the open end. In this embodiment, the cylindrical filter screen 62 is provided with staggered guide meshes 63. The guide meshes increase the contact area between the meshes and the flue gas, improving the filtration effect. The first pipe 1 is connected to the outer heat insulation sleeve 61 and corresponds to the inlet end of the cylindrical filter screen 62. The flue gas enters the cylindrical filter screen through the inlet end for filtration. The upper part of the outer heat insulation sleeve 61 is provided with an exhaust port 64 connected to the air inlet pipe 5. The filtered flue gas enters the air inlet pipe through the exhaust port. In this embodiment, the first pipe is sealed to the outer heat insulation sleeve through a flange structure. The flue gas enters the cylindrical filter screen through the first pipe for filtration. The filtered flue gas enters the outer heat insulation sleeve and enters the air inlet pipe through the exhaust port of the outer heat insulation sleeve, realizing the flow of waste heat flue gas from the roasting furnace 10 to the heat insulation box 2.

[0025] like Figure 3As shown, this embodiment further improves the connection structure between the cylindrical filter screen 62 and the outer heat insulation sleeve 61. Specifically, a positioning ring 65 is provided on the outer wall of the cylindrical filter screen 62, and a slot 66 is provided on the positioning ring 65. The slot 66 cooperates with the positioning protrusion 67 provided on the inner wall of the outer heat insulation sleeve 61. The positioning protrusion extends axially along the inner wall of the outer heat insulation sleeve. The design of the positioning ring not only serves a positioning function, but also leaves a gap between the cylindrical filter screen 62 and the outer heat insulation sleeve 61 to facilitate the flow of flue gas. The positioning ring is engaged with the positioning protrusion through the slot, which facilitates the quick replacement and quick and accurate installation of the cylindrical filter screen.

[0026] Example 3, as Figure 1 As shown, an energy-saving device utilizing waste heat and gas from a roasting furnace is further optimized based on Embodiment 1 or 2. In this embodiment, the heat exchange water tank 3 is equipped with S-shaped heat exchange pipes 31. The heat exchange pipes can be laid in one layer or multiple layers. This embodiment uses a single-layer heat exchange pipe as an example; the heat exchange pipes are in contact with water, increasing heat exchange efficiency. The inlet end of the heat exchange tube 31 is connected to the tee pipe 7 through the first inlet branch pipe. The flue gas from the inlet pipe 5 enters the heat exchange tube through the first inlet branch pipe. The exhaust end of the heat exchange tube 31 extends out of the heat insulation box 2 through the first exhaust pipe 32. As needed, the first exhaust pipe can directly discharge the filtered and cooled flue gas. A flow valve is provided on the first inlet branch pipe. The flow valve is used to control the amount of flue gas entering the heat exchange tube. A temperature sensor is provided on the heat exchange water tank 3. The temperature sensor is used to detect the temperature of the water in the heat exchange water tank 3. Both the flow valve and the temperature sensor are connected to the host computer. The host computer controls the opening of the flow valve according to the temperature of the water in the heat exchange water tank 3 detected by the temperature sensor. When the temperature of the water in the heat exchange water tank 3 reaches the set value, the opening of the flow valve can be closed or reduced to allow more waste heat flue gas to flow to the heat storage box, thereby improving the waste heat utilization rate.

[0027] In this embodiment, a further preferred embodiment includes a steam bucket 33 at the top of the heat exchange water tank 3. The steam bucket collects the hot steam evaporated from the water in the tank. The steam bucket 33 is connected to a drying pipe 34 mounted on the insulation box 2. A drying box 35 for holding desiccant is detachably installed inside the drying pipe 34; that is, the drying box contains desiccant for drying the steam. The drying pipe 34 is connected to an air pump 38 mounted on the insulation box 2. The air pump 38 is connected to the roasting furnace 10 via a feeding pipe 36. The dried gas can be pumped to the roasting furnace through the air pump, which can utilize the waste heat of the roasting furnace, realizing another cycle of heat energy and improving the waste heat utilization rate. In this embodiment, a condensation groove 37 is provided on the inner wall of the steam bucket 33. The condensation groove 37 is a strip groove or spiral groove arranged along the conical surface of the steam bucket 33. When some steam encounters the steam bucket 33 and liquefies, it can return to the heat exchange water tank along the condensation groove 37, preventing condensate from overflowing.

[0028] In this embodiment, a further preferred option is, such as Figure 4 As shown, the heat storage box 4 includes a heat storage box body 41, which is divided into an upper cavity 43 and a lower cavity 44 by a partition 42. At least two outer cylinders 45 are arranged side-by-side in the upper cavity 43; in this embodiment, three outer cylinders are used as an example. A heat storage medium 46, which can be sand, is provided in the lower cavity 44 to store the heat from the waste flue gas. A second filtration mechanism is provided in the outer cylinders 45 to perform secondary filtration of the flue gas entering the outer cylinders. Because some of the hot gas entering the outer cylinders needs to be discharged to the waste heat pipe, the gas needs to have less ash and slag. Therefore, a second filtration mechanism is provided in the outer cylinders 45 of the heat storage box to further filter the flue gas. The outer cylinder 45 is connected to the tee pipe 7 via the second air inlet branch pipe; the flue gas entering through the air inlet pipe enters the outer cylinder through the second air inlet branch pipe and the tee pipe; part of the gas medium filtered by the second filtration mechanism is connected to the external preheating pipe 48 through the second exhaust pipe 47, and part flows to the heat storage medium 46. A flow valve can be installed on the second exhaust pipe, which can be connected to external equipment requiring preheating through the external preheating pipe, or it can return to the roasting furnace through the prefabricated pipe to preheat the preheating equipment or roasting furnace. The high-temperature gas filtered by the second filtration mechanism can flow directly to the heat storage medium for direct heat storage. By changing the heat storage medium, waste heat can be continuously stored, and the heat stored in the heat storage medium can be reused more flexibly in the later stages.

[0029] In this embodiment, the second filtration mechanism includes a filter inner cylinder 49 rotatably disposed within the outer cylinder 45. The filter inner cylinder also adopts a blind cylinder structure made of screen mesh, and it is rotatably connected to the outer cylinder through bearing components. The filter inner cylinder 49 is connected to the second air inlet branch pipe through a rotary joint 410. The second air inlet branch pipe passes the waste heat flue gas to the filter inner cylinder for filtration through the rotary joint. In this embodiment, a spiral guide vane 411 is provided on the inner wall of the filter inner cylinder 49. The waste heat flue gas entering the filter inner cylinder contacts the spiral guide vane 411 at a certain speed, which pushes the spiral guide vane and drives the filter inner cylinder to rotate, thereby realizing dynamic filtration, reducing the local accumulation of ash and slag, and extending the service life of the filter inner cylinder.

[0030] like Figure 5As shown, in this embodiment, the bottom of the outer cylinder 45 is provided with a guide pipe 412. The guide pipe 412 extends through the partition 42 to the lower cavity 44 and contacts the heat storage medium 46 inside the lower cavity 44. The hot gas filtered by the second filtration mechanism is guided to the heat storage medium through the guide pipe 412 and undergoes contact heat conduction with the heat storage medium, storing the heat energy in the heat storage medium. The lower cavity 44 is provided with a grid box 413, and the heat storage medium 46 is placed in the grid box 413. The grid boxes correspond one-to-one with the outer cylinder. In this embodiment, three grid boxes are also used as an example. The three grid boxes are correspondingly set below the three outer cylinders to perform one-to-one heat transfer. The above design increases the heat storage capacity of the heat storage medium, which can store a large amount of waste heat of flue gas at the same time. Moreover, the design of using grid boxes to store the heat storage medium allows for continuous heat storage after the heat storage medium reaches its maximum energy value by replacing the grid box and the heat storage medium. The grid box that has completed energy storage is also easy to move and can be used for preheating or drying other parts, increasing the waste heat utilization efficiency.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An energy-saving device utilizing waste heat and waste gas from a roasting furnace, characterized in that: The equipment includes an insulated box (2) connected to the roasting furnace (10) via a first pipe (1). The insulated box (2) is equipped with a heat exchange water tank (3) and a heat storage box (4). The first pipe (1) is connected to an air inlet pipe (5) located in the insulated box (2) via a first filter mechanism (6). The air inlet pipe (5) is connected to the heat exchange water tank (3) and the heat storage box (4) via a three-way pipe (7).

2. The energy-saving device for utilizing waste heat and waste gas from a roasting furnace according to claim 1, characterized in that: The first filtration mechanism (6) includes an outer heat insulation sleeve (61) disposed in the heat insulation box (2), a cylindrical filter screen (62) is detachably disposed inside the outer heat insulation sleeve (61), and a staggered guide mesh (63) is disposed inside the cylindrical filter screen (62). The first pipe (1) is connected to the outer heat insulation sleeve (61) and corresponds to the inlet end of the cylindrical filter screen (62). The upper part of the outer heat insulation sleeve (61) is provided with an exhaust port (64) connected to the air inlet pipe (5).

3. The energy-saving device for utilizing waste heat and waste gas from a roasting furnace according to claim 2, characterized in that: The cylindrical filter screen (62) has a positioning ring (65) on its outer wall, and a slot (66) is provided on the positioning ring (65). The slot (66) cooperates with the positioning protrusion (67) provided on the inner wall of the outer heat insulation sleeve (61).

4. The energy-saving device for utilizing waste heat and waste gas from a roasting furnace according to any one of claims 1 to 3, characterized in that: The heat exchange water tank (3) is equipped with an S-shaped heat exchange pipe (31). The air inlet of the heat exchange pipe (31) is connected to the three-way pipe (7) through the first air inlet branch pipe. The exhaust end of the heat exchange pipe (31) extends out of the heat insulation box (2) through the first exhaust pipe (32). A flow valve is provided on the first air inlet branch pipe. A temperature sensor is provided on the heat exchange water tank (3).

5. The energy-saving device for utilizing waste heat and waste gas from a roasting furnace according to claim 4, characterized in that: The heat exchange water tank (3) is provided with a steam bucket (33) at the top. The steam bucket (33) is connected to a drying pipe (34) provided on the heat insulation box (2). A drying box (35) for placing desiccant is detachably provided inside the drying pipe (34). The drying pipe (34) is connected to an air pump (38) provided on the heat insulation box (2). The air pump (38) is connected to the roasting furnace (10) through an adding pipe (36).

6. The energy-saving device for utilizing waste heat and waste gas from a roasting furnace according to claim 5, characterized in that: The inner wall of the steam bucket (33) is provided with a condensation groove (37), which is a strip groove or spiral groove arranged along the conical surface of the steam bucket (33).

7. The energy-saving device for utilizing waste heat and waste gas from a roasting furnace according to any one of claims 1 to 3 and 6, characterized in that: The heat storage box (4) includes a heat storage box body (41). The heat storage box body (41) is divided into an upper cavity (43) and a lower cavity (44) by a partition (42). At least two outer cylinders (45) are arranged side by side in the upper cavity (43). The heat storage medium (46) is provided in the lower cavity (44). The outer cylinder (45) is provided with a second filter mechanism. The outer cylinder (45) is connected to the three-way pipe (7) through a second air inlet branch pipe. Part of the gas medium filtered by the second filter mechanism is connected to the external preheating pipe (48) through the second exhaust pipe (47), and part of it flows to the heat storage medium (46).

8. The energy-saving device for utilizing waste heat and waste gas from a roasting furnace according to claim 7, characterized in that: The second filtration mechanism includes a filter inner cylinder (49) rotatably disposed inside the outer cylinder (45). The filter inner cylinder (49) is connected to the second air intake branch pipe through a rotary joint (410). A spiral guide vane (411) is provided on the inner wall of the filter inner cylinder (49).

9. The energy-saving device for utilizing waste heat and waste gas from a roasting furnace according to claim 8, characterized in that: The bottom of the outer cylinder (45) is provided with a guide pipe (412), which extends through the partition (42) to the lower cavity (44) and contacts the heat storage medium (46) in the lower cavity (44).

10. The energy-saving device for utilizing waste heat and waste gas from a roasting furnace according to claim 9, characterized in that: The lower cavity (44) is provided with a grid box (413), and the heat storage medium (46) is placed in the grid box (413).

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