Four-in and four-out eight-channel blanking drying device

Abstract

The utility model provides a kind of four-in four-out eight-channel blanking's drying device, it is related to calcium carbide, semi-coke and coal industry drying technical field, this kind of drying device, mainly by vertically arranged drying cylinder, the side of drying cylinder is equipped with air inlet header pipe, air inlet pipe is divided into upper air inlet pipe and lower air inlet pipe, opposite side of drying cylinder is equipped with air outlet header pipe, air outlet header pipe and drying cylinder between are equipped with air outlet pipe, air outlet pipe is located between upper air inlet pipe and lower air inlet pipe, air outlet pipe is equipped with air guide fan, hot airflow enters drying cylinder from upper air inlet pipe and lower air inlet pipe, air guide fan forms negative pressure to the hot airflow to drying cylinder, force hot airflow to concentrate from the top and bottom of drying cylinder to middle part, hot airflow can be dried to the material that descending in flowing process, improve drying efficiency.

Description

Technical Field

[0001] This utility model relates to the field of chemical and metallurgical drying technology, and in particular to a drying device with four inlets, four outlets, and eight channels for material feeding. Background Technology

[0002] Drying equipment is crucial in the calcium carbide and raw (washed) coal industries, characterized by high production capacity, convenient construction, high thermal efficiency, long operating cycles, and simple operation. Drying kilns are also widely known for their advanced structure, reliable operation, and stable performance. A drying kiln production line is a mechanically automated production line composed of multiple auxiliary equipment. During production, it can use fluidized bed furnaces (or lime kiln exhaust gas) as a heat source. Its operating principle is based on physical reactions in industrial mass production, and it is currently one of the most widely used pieces of equipment in the calcium carbide and raw (washed) coal industries. For example, existing drying kilns (or sleeve kilns) on the market have a capacity of 15-17 tons / hour, playing a positive role in energy conservation and consumption reduction in the energy-intensive calcium carbide production process.

[0003] However, due to the inherent characteristics of its process and equipment, drying kilns (or sleeve kilns) suffer from technical problems such as low output, red material output, high breakage rate, and unstable moisture content. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a drying device with four inlets and four outlets and eight channels for feeding, so as to solve the technical problems of low output, red material output, high breakage rate and unstable moisture content in the existing drying devices due to their own process and equipment characteristics.

[0005] To achieve the above objectives, this utility model provides a drying device with four inlets and four outlets and eight channels for material feeding. It includes a vertically arranged drying cylinder with an inlet at the top and an outlet at the bottom. An air inlet manifold is located on one side of the drying cylinder, and four air inlet pipes are arranged between the air inlet manifold and the drying cylinder. Each air inlet pipe is divided into an upper air inlet pipe and a lower air inlet pipe. An air outlet manifold is located on the opposite side of the drying cylinder, and four air outlet pipes are arranged between the air outlet manifold and the drying cylinder. Each air outlet pipe is located between the upper air inlet pipe and the lower air inlet pipe, and an induced draft fan is installed inside the air outlet pipe.

[0006] Optionally, the presence of the induced draft fan creates a preheating drying zone, a hot air drying zone, and a low-temperature drying zone inside the drying cylinder, which are arranged sequentially from top to bottom.

[0007] Optionally, the area inside the drying cylinder corresponding to the upper air inlet pipe and the two upper air outlet pipes is the preheating and drying zone.

[0008] Optionally, the area inside the drying cylinder corresponding to the lower air inlet pipe and the two lower air outlet pipes is the hot air drying zone.

[0009] Optionally, the area inside the drying cylinder below the lower air inlet pipe is the low-temperature drying zone.

[0010] Optionally, the drying cylinder is provided with several guide cylinders, which are arranged sequentially from top to bottom in the inner cavity of the drying cylinder. During the process of the material passing through the guide cylinders, it is dried in sequence by the preheating drying zone, the hot air drying zone and the low temperature drying zone.

[0011] Optionally, the guide cylinder includes an outer ring of the material layer and an inner ring of the material layer, wherein the inner ring of the material layer is disposed inside the outer ring of the material layer and forms an annular guide channel between them.

[0012] Optionally, both the outer ring and the inner ring of the material layer are configured as louver structures.

[0013] Optionally, it also includes a baffle plate, which includes an inner baffle plate and an outer baffle plate. The inner baffle plate is disposed inside the inner ring of the material layer, and the outer baffle plate is disposed between the outer ring of the material layer and the inner wall of the drying cylinder.

[0014] Optionally, both the inner and outer wind deflectors are shaped like a frustum of a cone, with the larger radius end of the inner wind deflector facing downwards and the larger radius end of the outer wind deflector facing upwards.

[0015] The drying device with four inlets and four outlets and eight channels for material feeding provided by this utility model has the following technical effects: This type of drying device mainly consists of a vertically arranged drying cylinder. An air inlet manifold is provided on one side of the drying cylinder, which is divided into an upper air inlet manifold and a lower air inlet manifold. An air outlet manifold is provided on the opposite side of the drying cylinder. An air outlet manifold is provided between the air outlet manifold and the drying cylinder. The air outlet manifold is located between the upper air inlet manifold and the lower air inlet manifold. An induced draft fan is installed in the air outlet manifold. Hot air enters the drying cylinder from the upper air inlet manifold and the lower air inlet manifold. The induced draft fan creates a negative pressure on the hot air flowing towards the drying cylinder, forcing the hot air to concentrate from the top and bottom of the drying cylinder towards the middle. During the flow of hot air, the descending material can be dried, thus improving the drying efficiency.

[0016] In the optional solution, since the drying drum has a preheating drying zone, a hot air drying zone, and a low-temperature drying zone arranged sequentially from top to bottom, the material first reaches the preheating drying zone when it enters the drying drum. The preheating drying zone uses relatively low-temperature hot air to pre-dry the material, so that the material temperature gradually rises under the influence of the gentle hot air. When the material reaches the hot air drying zone, the material already has a certain temperature and will not burst, effectively preventing secondary damage and reducing the material breakage rate. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0018] Figure 1 This is a three-dimensional structural diagram of the drying device with four inlets, four outlets, and eight channels for material feeding according to this utility model; Figure 2 yes Figure 1 Schematic diagram of the internal structure of the drying device; Figure 3 yes Figure 2 Schematic diagram of the feed cylinder of the medium drying device Figure 4 yes Figure 2 Relative flow diagram of hot air and materials.

[0019] in, Figures 1-4 : 1. Drying drum; 11. Feed inlet; 12. Discharge outlet; 13. Preheating drying zone; 14. Hot air drying zone; 15. Low temperature drying zone; 16. Guide cylinder; 161. Annular guide channel; 162. Inner ring of material layer; 163. Outer ring of material layer; 164. Louver structure; 17. Inner baffle plate; 18. Outer baffle plate; 2. Air inlet manifold; 21. Upper air inlet duct; 22. Lower air inlet duct; 3. Air outlet manifold; 31. Air outlet duct. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In existing technologies, drying equipment, as a crucial component of the calcium carbide and raw coal industries, generally suffers from technical bottlenecks such as low output, red-hot material, high breakage rates, and unstable moisture content. Traditional drying kilns employ a single-channel hot air circulation mode, resulting in uneven heating of the material within the cylinder. This leads to premature surface drying while residual moisture remains inside. Furthermore, the concentration of high-temperature areas easily causes localized overheating, resulting in carbonization and breakage of the material. For example, in the operation of a certain type of sleeve kiln, the material undergoes rapid heating and cooling along a single hot air path, and the repeated thermal stress results in a particle breakage rate as high as 8%-12%.

[0022] To address the aforementioned issues, researchers discovered that uneven hot air distribution and uncontrolled temperature gradients were the core factors leading to material breakage. By observing the material's movement trajectory within the drying cylinder 1, they found that the existing single-inlet, single-outlet structure was insufficient to create a gradual temperature zone. Based on thermodynamic simulation experiments, they attempted to divide the drying cylinder 1 into multiple independent temperature-controlled zones, establishing a temperature gradient using a layered air inlet method. Further investigation revealed that the position of the induced draft fan directly affected the hot air residence time; adjusting the layout of the inlet and outlet ducts 31 created a three-stage drying environment. Ultimately, a four-inlet, four-outlet air duct structure was adopted, causing the hot air to form a spiral upward airflow inside the cylinder, which, combined with the guide cylinder 16, extended the material residence time.

[0023] Therefore, as Figure 1-3 As shown, this utility model provides a drying device, specifically including a vertically arranged drying cylinder 1. The drying cylinder 1 has a feed inlet 11 at the top and a discharge outlet 12 at the bottom. An air inlet manifold 2 is provided on one side and connected to the drying cylinder 1 through four air inlet pipes. The air inlet pipe is divided into an upper air inlet pipe 21 and a lower air inlet pipe 22. An air outlet manifold 3 is provided on the opposite side and connected to the drying cylinder 1 through four air outlet pipes 31. The air outlet pipes 31 are located between the upper air inlet pipe 21 and the lower air inlet pipe 22, and an induced draft fan is installed inside the air outlet pipes 31.

[0024] The inlet manifold 2 is an airflow distribution device for centrally distributing hot air. It can be implemented using a ring manifold structure, and its function is to evenly distribute the airflow generated by the heat source to the four inlet manifolds. The upper inlet manifold 21 is a hot air input channel located at the top of the drying cylinder 1, used to deliver initial hot air to the preheating area. The lower inlet manifold 22 is a hot air input channel located at the bottom of the drying cylinder 1, used to provide high-temperature airflow to the main drying area. The outlet manifold 3 is a waste gas recovery device; its internal negative pressure environment guides the airflow in a directional direction. The induced draft fan is an airflow driving device installed inside the outlet manifold 31, specifically an axial flow fan, whose speed is adjusted to control the exhaust rate of each area.

[0025] like Figure 1 and Figure 2 As shown, the air inlet manifold 2 and the air outlet manifold 3 are both placed vertically and parallel to the drying cylinder 1. The upper air inlet pipe 21, the lower air inlet pipe 22 and the air outlet pipe 31 are all arranged in parallel.

[0026] like Figure 2 As shown, the presence of the induced draft fan creates a preheating drying zone 13, a hot air drying zone 14, and a low-temperature drying zone 15 within the drying cylinder 1, arranged sequentially from top to bottom. The area inside the drying cylinder 1 corresponding to the upper air inlet pipe 21 and the two upper air outlet pipes 31 is the preheating drying zone 13. The area inside the drying cylinder 1 corresponding to the lower air inlet pipe 22 and the two lower air outlet pipes 31 is the hot air drying zone 14. The area inside the drying cylinder 1 below the lower air inlet pipe 22 is the low-temperature drying zone 15.

[0027] The preheating drying zone 13, the hot air drying zone 14, and the low temperature drying zone 15 are described in detail below.

[0028] Preheating and drying zone 13: (1) When the moisture content of the carbon material is ≤20%, the hot air temperature in this area is controlled at around 260℃ (±5℃). After the carbon material passes through this area, the moisture content is reduced to 7-9%.

[0029] (2) When the moisture content of the carbon material is ≥20%, the hot air temperature in this area is controlled at around 280℃ (±5℃). After the carbon material passes through this area, the moisture content is reduced to 7-9%.

[0030] (3) Hot air temperature control relies on an integrated measuring element on the hot air pipeline and is displayed in real time on the DCS; carbon material temperature control relies on thermocouples to measure the temperature of the hot air after heat exchange through the material and is displayed in real time on the DCS with alarms and interlocks set (detailed below).

[0031] (4) The moisture content of the carbon material is monitored by an online moisture analyzer installed in the 31 outlet ducts. The moisture content of the hot air is determined by the empirical formula: moisture content in hot air + 2%, and the result is displayed in real time on the DCS. The following measures are taken based on the data: a. If the moisture content of the carbon material is ≥9%, the hot air temperature can be increased by adjusting the air distribution valve to ensure that the moisture content of the carbon material in this area is between 7-9%; b. If the moisture content of the carbon material is ≤7%, the hot air temperature can be reduced by adjusting the air distribution valve to ensure that the moisture content of the carbon material in this area is between 7-9%.

[0032] Hot air drying zone 14: When carbon materials with a moisture content of ≤7-9% enter the hot air drying zone 14, the hot air temperature in this zone is controlled at around 260℃ (±5℃). After passing through this zone, the moisture content of the carbon materials is reduced to 3-5%. The hot air temperature is controlled by an integrated measuring element on the hot air pipeline and is displayed in real time on the DCS. The carbon material temperature is controlled by thermocouples measuring the temperature of the material after the hot air penetrates the material and undergoes heat exchange. This temperature is also displayed in real time on the DCS, and alarms and interlocks are set (details below).

[0033] The moisture content of the carbon material is monitored by an online moisture analyzer installed in 31 outlet ducts. The moisture content in the hot air is determined using an empirical formula: moisture content in hot air + 2%, and the result is displayed in real-time on the DCS. Based on the data, the following measures are taken: a. If the moisture content of the carbon material is >5%, the hot air temperature can be increased by adjusting the air distribution valve to ensure that the moisture content of the carbon material in this area is between 3% and 5%. b. If the moisture content of the carbon material is <3%, the hot air temperature can be reduced by adjusting the air distribution valve to ensure that the moisture content of the carbon material in this area is between 3% and 5%.

[0034] The moisture content in this area is controlled between 3% and 5%.

[0035] Low-temperature drying zone 15 The moisture content in this area is controlled to be below 1%. The control method is the same as above.

[0036] Using the drying apparatus of this embodiment, hot airflow enters the drying cylinder 1 through the upper air inlet duct 21 and the lower air inlet duct 22. The induced draft fan creates a negative pressure on the hot airflow flowing towards the drying cylinder 1, forcing the hot airflow to concentrate from the top and bottom of the drying cylinder 1 towards the middle. During the flow of the hot airflow, the descending material can be dried, thus improving the drying efficiency. In a preferred embodiment, the drying cylinder 1 is provided with several guide cylinders 16, which are arranged sequentially from top to bottom in the inner cavity of the drying cylinder 1. During the process of the material passing through the guide cylinders 16, it is dried in sequence by the preheating drying zone 13, the hot air drying zone 14 and the low temperature drying zone 15.

[0037] Specifically, such as Figure 3 As shown, the material guide cylinder 16 includes an outer ring 163 and an inner ring 162 of the material layer. The inner ring 162 is located inside the outer ring 163 of the material layer, and forms an annular material guide channel 161 between them. Both the outer ring 163 and the inner ring 162 of the material layer are provided with a louver structure 164.

[0038] Under the influence of gravity, the material creeps into the feed cylinder 16 and is gradually dried. The material is evenly distributed in the annular feed channel 161 by the outer ring 163 and inner ring 162 of the material layer. The annular feed channel 161 is divided into eight compartments by the material layer partitions. While blocking the material from entering and exiting, the outer ring 163 and inner ring 162 of the material layer maximize the passage of hot air. The material layer partitions divide the material layer into eight compartments, enabling precise control of the drying cylinder 1.

[0039] As a preferred embodiment, such as Figure 2As shown, it also includes a baffle plate, which includes an inner baffle plate 17 and an outer baffle plate 18. The inner baffle plate 17 is located inside the inner ring 162 of the material layer, and the outer baffle plate 18 is located between the outer ring 163 of the material layer and the inner wall of the drying cylinder 1. Both the inner baffle plate 17 and the outer baffle plate 18 are truncated cones, with the larger radius end of the inner baffle plate 17 facing downwards and the larger radius end of the outer baffle plate 18 facing upwards.

[0040] like Figure 2 As shown, there are four outer wind deflectors 18, which are arranged at intervals from top to bottom, while there are two inner wind deflectors 17, which are arranged at intervals within the outer wind deflectors 18, that is, the first and third outer wind deflectors 18 have inner wind deflectors 17 inside them.

[0041] The relative flow direction of hot air and materials is as follows Figure 4 As shown, when hot air enters the drying cylinder 1 through the air inlet, it passes through the material under the action of the outer baffle 18 and the negative pressure principle, achieving a heat exchange with the material once, and then enters the inner chamber of the drying cylinder 1. Due to the pressure difference, the hot air entering the inner chamber of the drying cylinder 1 moves upward and reaches the inner baffle 17. Under the action of the inner baffle 17 and the negative pressure principle, the hot air will penetrate the material again into the outer chamber of the drying cylinder 1. The air outlet pipe 31 of the drying cylinder 1 is directly connected to the air outlet collector pipe 3. At this time, the hot air will directly enter the dust removal system through the air outlet collector pipe 3, reducing the dust content to below 20mg / Nm³, and then being discharged into the atmosphere through the chimney.

[0042] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A drying device of four-in-four-out eight-channel blanking, characterized in that, The device includes a vertically arranged drying cylinder with a feed inlet at the top and a discharge outlet at the bottom. An air inlet manifold is located on one side of the drying cylinder, and four air inlet pipes are connected between the air inlet manifold and the drying cylinder. These air inlet pipes are divided into an upper air inlet pipe and a lower air inlet pipe. An air outlet manifold is located on the opposite side of the drying cylinder, and four air outlet pipes are connected between the air outlet manifold and the drying cylinder. The air outlet pipes are located between the upper and lower air inlet pipes, and an induced draft fan is installed inside each air outlet pipe.

2. The four-by-four eight-lane down-drying apparatus according to claim 1, wherein, The presence of the induced draft fan creates a preheating drying zone, a hot air drying zone, and a low-temperature drying zone inside the drying cylinder, which are arranged sequentially from top to bottom.

3. The four-by-four eight-lane down-drying apparatus according to claim 2, wherein, The area inside the drying cylinder corresponding to the upper air inlet pipe and the two upper air outlet pipes is the preheating and drying zone.

4. The four-by-four eight-lane downstack drying apparatus of claim 2, wherein, The area inside the drying cylinder corresponding to the lower air inlet pipe and the two lower air outlet pipes is the hot air drying zone.

5. The four-by-four eight-lane downstack drying apparatus of claim 2, wherein, The area inside the drying cylinder below the lower air inlet pipe is the low-temperature drying zone.

6. The four-by-four eight-lane downstack drying apparatus of any of claims 2-5, wherein, The drying cylinder is equipped with several guide cylinders, which are arranged sequentially from top to bottom in the inner cavity of the drying cylinder. As the material passes through the guide cylinders, it is dried in sequence by the preheating drying zone, the hot air drying zone, and the low temperature drying zone.

7. The four-by-four eight-lane downstack drying apparatus of claim 6, wherein, The material guide cylinder includes an outer ring of material layer and an inner ring of material layer. The inner ring of material layer is located inside the outer ring of material layer and forms an annular material guide channel with the outer ring of material layer.

8. The drying device with four inlets and four outlets and eight channels for material feeding according to claim 7, characterized in that, Both the outer and inner rings of the material layer are designed with louvered structures.

9. The four-by-four eight-lane downstack drying apparatus of claim 7, wherein, It also includes a wind baffle, which includes an inner wind baffle and an outer wind baffle. The inner wind baffle is located inside the inner ring of the material layer, and the outer wind baffle is located between the outer ring of the material layer and the inner wall of the drying cylinder.

10. The four-by-four eight-lane downstack drying apparatus of claim 9, wherein, Both the inner and outer wind deflectors are shaped like truncated cones, with the larger radius end of the inner wind deflector facing downwards and the larger radius end of the outer wind deflector facing upwards.

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