A waste heat recovery device for a carbonization furnace

Abstract

This utility model discloses a waste heat recovery device for a carbonization furnace, including a carbonization furnace body and a flue gas outlet located at the upper end of the carbonization furnace body. A chimney is installed on the flue gas outlet, and a preheating mechanism for pre-drying wood blocks using the waste heat of the flue gas is set between the flue gas outlet and the chimney. High-temperature flue gas is discharged from the flue gas outlet and enters the heating cylinder. The increased diameter of the heating cylinder increases the flow time of the flue gas in the heating cylinder. In this way, the high-temperature gas in the flue gas is transferred to the wood blocks in the receiving cavity through the heating cylinder, thereby preheating them. The moisture generated by the heating of the wood blocks is discharged upward through the gaps between the wood blocks. After the wood blocks in the carbonization furnace body are carbonized, they can be removed by lifting the handle. The wood blocks slide off the support plate and fall onto the carbonization furnace body, where they are then collected and placed into the carbonization furnace body for carbonization. This shortens the carbonization time, effectively utilizes the heat in the flue gas, and is more energy-efficient.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery devices for carbonization furnaces, specifically a waste heat recovery device for a carbonization furnace. Background Technology

[0002] Carbonization furnaces are used to convert wood blocks into charcoal. Carbonization furnaces are divided into high-temperature and low-temperature furnaces, with temperatures reaching 800 to 1000 degrees Celsius. This process generates flue gas, which needs to be exhausted. The flue gas can be reused for combustion; however, the heat carried by the flue gas at high temperatures is wasted after exhaust, making it inefficient. Therefore, a high-temperature carbonization furnace capable of utilizing waste heat is needed. Utility Model Content

[0003] The purpose of this utility model is to provide a waste heat recovery device for a carbonization furnace to solve the problems mentioned in the background art. It can effectively recover the waste heat from the high-temperature flue gas discharged from the main body of the carbonization furnace and use the waste heat to pre-dry the wood blocks.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A waste heat recovery device for a carbonization furnace includes a carbonization furnace body and a flue gas outlet located at the upper end of the carbonization furnace body. A chimney is installed on the flue gas outlet, and a preheating mechanism for pre-drying wood blocks using the waste heat from the flue gas is provided between the flue gas outlet and the chimney.

[0005] Specifically, in this utility model, the preheating mechanism includes a heating cylinder connected between the flue gas outlet and the chimney to increase the heating area, and a support mechanism for accommodating wood blocks for pre-drying is provided on the outside of the heating cylinder. The support mechanism includes an annular support plate fixed to the lower side of the circumference of the heating cylinder, and an accommodating cylinder that abuts against the upper end of the carbonization furnace body is sleeved on the outside of the support plate. An accommodating cavity for accommodating wood blocks is formed between the accommodating cylinder, the support plate and the heating cylinder, and a distance is left between the support plate and the upper end of the carbonization furnace body to support the accommodating cylinder.

[0006] To increase the time the flue gas spends inside the heating cylinder, the chimney and the exhaust port are symmetrically arranged about the axis of the heating cylinder and near the outer region of the heating cylinder. The heating cylinder is also equipped with several vertically arranged partitions. One end of the partition is fixed to the inner wall of the heating cylinder, and the other end leaves an air duct between it and the inner wall of the heating cylinder. Two adjacent air ducts are located on both sides of the heating cylinder.

[0007] To facilitate the removal of the container, a ring-shaped handle is fitted around the circumference of the container, and the handle is connected to the container via a connecting rod. To facilitate the removal of the pre-dried wood blocks at the bottom of the container, a material outlet is provided near the bottom of the container. The material outlet is sealed by a rotating door, and one side of the rotating door is installed on the outer wall of the container via a hinge.

[0008] Compared with the prior art, the beneficial effects of this utility model are: 1. High-temperature flue gas is discharged from the exhaust port and enters the heating cylinder. The increased diameter of the heating cylinder increases the flow time of the flue gas inside. At the same time, the exhaust port is staggered from the chimney to increase the time the flue gas stays inside. The receiving cylinder is fitted onto the support plate, and the wooden blocks are placed in the receiving cavity formed by the receiving cylinder and the heating cylinder. In this way, the high-temperature gas in the flue gas is transferred to the wooden blocks in the receiving cavity through the heating cylinder, thereby preheating. The moisture generated by the heating of the wooden blocks is discharged upward through the gaps between the wooden blocks. 2. After the wood blocks inside the carbonization furnace are carbonized, remove them and lift the handle. The wood blocks will slide off the support plate and fall onto the carbonization furnace body, where they will be collected and placed inside for carbonization. Because the wood blocks have been preheated and have a certain temperature, carbonization is faster, thus shortening the carbonization time, effectively utilizing the heat in the flue gas, and saving more energy. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is the front view of the present invention; Figure 3 This is a top view showing the connection between the heating cylinder and the receiving cylinder of this utility model; Figure 4 This is a front view showing the connection between the support plate and the heating cylinder of this utility model; Figure 5 This is a partial sectional view of the main view of this utility model.

[0010] In the diagram: 1. Carbonization furnace body; 11. Exhaust vent; 12. Chimney; 2. Heating cylinder; 21. Baffle plate; 22. Support plate; 23. Container cylinder; 24. Handle; 25. Rotary door. Detailed Implementation

[0011] 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.

[0012] Example 1 like Figure 1 , Figure 2As shown, this utility model provides a technical solution for a waste heat recovery device for a carbonization furnace: a waste heat recovery device for a carbonization furnace includes a carbonization furnace body 1 and a flue gas outlet 11 disposed at the upper end of the carbonization furnace body 1. A chimney 12 is installed on the flue gas outlet 11. A preheating mechanism for pre-drying wood blocks using the waste heat of the flue gas is disposed between the flue gas outlet 11 and the chimney 12. The preheating mechanism includes a heating cylinder 2 connected between the flue gas outlet 11 and the chimney 12 to increase the heating area. The heating cylinder 2 can be made of 310S stainless steel, which has excellent high temperature resistance and good thermal conductivity, with a thermal conductivity coefficient of 15-18 W / (m・K), ensuring efficient transfer of waste heat. The heating cylinder 2 is closed at both ends, and its diameter is larger than the diameter of the flue gas outlet 11 and the chimney 12. A support mechanism for accommodating wood blocks for pre-drying is disposed on the outside of the heating cylinder 2, and the support mechanism supports the preheated wood blocks.

[0013] like Figure 1 , Figure 4 As shown, the support mechanism includes an annular support plate 22 fixed to the lower side of the heating cylinder 2, and a receiving cylinder 23 that abuts against the upper end of the carbonization furnace body 1 is sleeved on the outer side of the support plate 22. The receiving cylinder 23 is open at both the upper and lower ends, and a receiving cavity for receiving wood blocks is formed between the receiving cylinder 23, the support plate 22 and the heating cylinder 2. A distance is left between the support plate 22 and the upper end of the carbonization furnace body 1 to support the receiving cylinder 23. This distance is to prevent the receiving cylinder 23 from tilting and sliding. The outer end of the receiving cylinder 23 can be covered with an insulation layer, which is common technology and will not be described in detail.

[0014] Example 2 like Figure 1 As shown, based on Embodiment 1, the chimney 12 and the exhaust port 11 are symmetrically arranged about the axis of the heating cylinder 2 and close to the outer region of the heating cylinder 2. This increases the residence time of the smoke in the heating cylinder 2 and better transfers heat to the wood block. The heating cylinder 2 is also equipped with several vertically arranged baffles 21. One end of the baffle 21 is fixed to the inner wall of the heating cylinder 2, and the other end leaves an air duct between it and the inner wall of the heating cylinder 2. Two adjacent air ducts are located on both sides of the heating cylinder 2. Through this staggered arrangement of baffles 21, the high-temperature flue gas can form a tortuous flow path in the heating cylinder 2, further extending the residence time of the flue gas in the heating cylinder 2, fully exchanging heat with the inner wall of the heating cylinder 2, and further improving the waste heat recovery efficiency.

[0015] Example 3 like Figure 2 , Figure 3 As shown, based on Embodiment 1, a ring-shaped handle 24 is sleeved on the circumferential side of the receiving cylinder 23, and the handle 24 is connected to the receiving cylinder 23 by a connecting rod, which makes it easy to lift the receiving cylinder 23, thereby exposing and collecting the wood blocks inside the receiving cylinder 23 as a whole, so as to facilitate subsequent carbonization and faster heating.

[0016] Example 4 like Figure 5 As shown in Embodiment 3, to facilitate the removal of the pre-dried wood blocks from the lower part of the receiving cylinder 23, a material inlet is provided near the bottom of the receiving cylinder 23. The material inlet is sealed by a rotating door 25, one side of which is hinged to the outer wall of the receiving cylinder 23. As the high-temperature flue gas rises and heats the wood blocks, the wood blocks at the lower part of the receiving cylinder 23 will certainly dry faster than those at the upper part. At this point, the rotating door 25 can be opened, and the wood blocks at the lower part of the receiving cylinder 23 can be removed from the material inlet. After removal, the rotating door 25 can be closed to seal the material inlet. A latch is provided on the side of the revolving door 25 away from the hinge, which cooperates with the buckle on the receiving cylinder 23 to realize the opening, closing and fixing of the revolving door 25. The latch and buckle are existing technologies and will not be described in detail here. As long as the opening, closing and fixing of the revolving door 25 is realized, the remaining wood blocks in the upper part of the receiving cylinder 23 can move downward by gravity and flow out of the space at the upper end of the receiving cylinder 23. Wood blocks to be dried can continue to be added from the upper end of the receiving cylinder 23. By repeating the above operation, the drying of wood blocks can be continuous, and the dried wood blocks can be removed without removing the receiving cylinder 23 from the carbonization furnace body 1.

[0017] Although 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery device for a carbonization furnace, comprising a carbonization furnace body (1) and a flue gas outlet (11) disposed at the upper end of the carbonization furnace body (1), wherein a chimney (12) is installed on the flue gas outlet (11), characterized in that: A preheating mechanism for pre-drying wood blocks using waste heat from the exhaust gas is provided between the exhaust port (11) and the chimney (12); The preheating mechanism includes a heating cylinder (2) that increases the heating area between the flue gas outlet (11) and the chimney (12), and a support mechanism for accommodating wood blocks for pre-drying is provided on the outside of the heating cylinder (2); The chimney (12) and the exhaust port (11) are symmetrically arranged about the axis of the heating cylinder (2) and close to the outer region of the heating cylinder (2); The heating cylinder (2) is also provided with several vertically arranged partitions (21). One end of the partition (21) is fixed to the inner wall of the heating cylinder (2), and the other end is left with an air duct between it and the inner wall of the heating cylinder (2). The two adjacent air ducts are located on both sides of the heating cylinder (2).

2. A waste heat recovery device for a carbonization furnace according to claim 1, characterized by: The support mechanism includes an annular support plate (22) fixed to the lower side of the heating cylinder (2), and a receiving cylinder (23) that abuts against the upper end of the carbonization furnace body (1) is sleeved on the outside of the support plate (22). A receiving cavity for receiving wood blocks is formed between the receiving cylinder (23), the support plate (22) and the heating cylinder (2), and a distance is left between the support plate (22) and the upper end of the carbonization furnace body (1) to support the receiving cylinder (23).

3. A waste heat recovery device for a carbonization furnace according to claim 2, characterized in that: The container (23) has a ring-shaped handle (24) sleeved on its circumferential side, and the handle (24) is connected to the container (23) by a connecting rod.

4. The waste heat recovery device for a carbonization furnace according to claim 3, characterized in that: The receiving cylinder (23) has a material inlet near its bottom. The material inlet is blocked by a rotating door (25). One side of the rotating door (25) is installed on the outer wall of the receiving cylinder (23) by a hinge.

Images