Drum dewatering drying apparatus

Abstract

The application discloses a drum drying equipment, and main components include an inner drum, an outer drum, a support, a heat source, a rotating system and an absorption system; the inner drum and the outer drum are installed on the support, the inner drum has the same axial direction as the outer drum, the inner drum is sleeved in the outer drum, and a gap is formed between the two drums; the heat source is arranged in the gap between the inner drum and the outer drum; the rotating system drives the inner drum to rotate; the heat source provides heat energy to heat the drum to realize dehydration and drying; and the absorption system removes smoke dust and reactive active substances and recycles heat energy.

Description

Technical Field

[0001] This invention relates to the field of material drying technology; specifically, it relates to drum drying equipment. Background Technology

[0002] Dryers are common industrial drying equipment that use heat energy to heat and dehydrate materials. Heat energy causes the moisture in the material to change from bound water and liquid water to a gaseous state. This heat energy is provided by a heat source, including electricity, natural gas, hot air, and steam. Heating methods include convection (direct contact between the heat medium and the material, such as hot air drying), conduction (heat transfer through metal walls, high thermal efficiency but limited by the heat transfer area), radiation (using electromagnetic waves to heat the material surface), and dielectric (such as microwave drying, which generates heat through the high-frequency vibration of polar molecules). Based on their structure, dryers are classified into drum dryers, spray dryers, fluidized bed dryers, scraper dryers, disc dryers, rake dryers, and paddle dryers, among others.

[0003] Rotary drum dryers offer high operational flexibility and are particularly suitable for drying solid materials such as coal slime, fly ash, sand, silica sand, and chemical raw materials. They boast high processing capacity, low fuel consumption, and low drying costs. A rotary drum dryer mainly consists of a heat source, drums, lifting plates, a rotating system, supporting equipment, and sealing components. It is a highly efficient drying device that can utilize both conductive and convection heating. Most existing rotary drum dryers employ convection heating, where hot air directly heats the material; others use flames to heat the outer wall of the drum. Conductive heating is the primary heating method, but equipment for achieving true drying remains lacking. This invention provides a novel rotary drum dryer with gas-fired conductive heating. Summary of the Invention

[0004] The purpose of this invention is to provide a novel drum dehydration and drying device, expanding the application range of drum dryers. The novel drum dryer utilizes a heat source to heat the outer wall of the drum, and the heat is conducted through the drum wall to heat the material. In traditional drum dehydration and drying machines, the heat source is placed inside the drum, and the heat and carbon dioxide generated by the flame directly contact the material inside the drum, causing pollution. If the carbon dioxide can react with the material, it will damage the material, violating the purpose of dehydration and drying. The purpose of this invention is to solve this problem by placing the heat source outside the drum, such as a burner flame heating the outer wall of the drum, and the drum wall transferring heat energy to the material to achieve dehydration and drying. Furthermore, the rolling of toothed rollers or toothed balls inside the drum solves the problem of material adhering to the drum wall; alternatively, lifting plates and chains can be used to peel the material off. The structure of the novel drum drying equipment is as follows: Figure 1 As shown.

[0005] Furthermore, the flue gas discharged from the dryer contains heat, pollutants, and substances that may chemically react with the materials. To recover the waste heat and reuse the flue gas, it is necessary to remove the pollutants and reactive substances. To address this problem, this invention discloses a gas scrubbing system for removing pollutants and reactive substances from flue gas; such as... Figure 3 .

[0006] Figure 1 This is a schematic diagram of the drum structure of the novel drum dehydration and drying device of the present invention, and also a schematic diagram of the novel structure and components involved in the present invention. The main feature of this drum is that it contains two cylindrical components: one is a drum 3, also called the inner drum, fixed to a support and equipped with gears. The rotation of the drum 3 is driven by a rotating system through the transmission between the gears; the other is an outer drum 2, with the drum 3 placed inside the outer drum 2. The two drums have the same axial direction and a certain gap between them. The outer drum 2 is fixed to the support and is mainly composed of insulation material to reduce heat radiation. One end of the outer drum 2 has a sealing ring to seal it with the drum 3. An exhaust pipe 1 is placed at the top of the outer drum 2 and is used to discharge the exhaust gas produced by combustion. A heat source 4 is fixed to the support, and a heat nozzle 5 is located in the gap between the drum 3 and the outer drum 2. The heat flow from the nozzle 5 heats the drum 3.

[0007] Figure 2 This is a schematic diagram of the drum structure of the novel drum dehydration and drying device of the present invention, wherein the drum 3 is wound by the spiral tube 6.

[0008] Figure 3 This is a schematic diagram of a drum dryer containing a washing system, which is related to the present invention. The airflow pipe 10 connects the exhaust pipe 1 and the absorption tower 11. The absorption tower 11 is connected to the induced draft fan 13 via the pipe 12. The airflow pipe 14 connects the induced draft fan 13 and the air inlet end of the inner cylinder 3 of the drum dryer.

[0009] Furthermore, the drum dryer of the present invention also includes necessary supporting equipment such as a feeding machine, a discharging machine, a waste heat recovery system, a drum rotation system, a material conveying pump, a flow meter, a throttle valve, a thermometer, and a control system.

[0010] Furthermore, in the drum drying equipment of the present invention, the two ends of the drum 3 are the feed inlet and the discharge outlet, respectively. The feed inlet is connected to the feeder, and the discharge outlet is connected to the unloader.

[0011] Furthermore, in the drum dehydration and drying device of the present invention, the drum 3 may also have a damping plate on its exterior.

[0012] Furthermore, in the drum dehydration and drying device of the present invention, the drum 3 may also have a spiral tube wound around its outer wall surface. Hot fluid enters one end of the spiral tube to heat the drum 3, and the hot fluid exits from the other end of the spiral tube. Figure 2.

[0013] Furthermore, the inside of the roller 3 may contain toothed rollers, toothed balls, lifting plates, or chains. One of these components may be selected, or two or more may be used in combination.

[0014] Furthermore, the outer cylinder 2 described in this invention is mainly composed of heat-insulating materials, such as heat-insulating cotton, heat-insulating materials, and refractory bricks.

[0015] Furthermore, in the drum dehydration and drying device of the present invention, the heat source 4 is selected from fuel burners, electric heaters, hot fluids, steam and hot air, etc.; multiple burners and electric heaters 4 can be used, and multiple nozzles 5 of the burner 4 can also be used.

[0016] Furthermore, in the drum dehydration and drying device of the present invention, the burner 4 can be selected from burners of various fuels, such as natural gas, biomass pyrolysis gas, fuel gas, coal, coal pyrolysis gas, fuel oil, hydrogen, and ammonia.

[0017] Furthermore, in the drum dehydration and drying device of the present invention, the electric heater 4 can be selected from resistance heaters, electromagnetic heaters, infrared heaters, etc.

[0018] Furthermore, in the drum dehydration and drying device of the present invention, the resistance heater and the electromagnetic heater can surround the outer wall of the drum 3.

[0019] Furthermore, in the drum dehydration and drying device of the present invention, the heat fluid 4 is selected from various heat transfer fluids, such as molten salt, heat transfer oil, steam, hot water, hot air and hot air flow.

[0020] Furthermore, the drum dehydration and drying device of the present invention also includes a gas washing system, which mainly consists of an induced draft fan, a pipeline, an absorbent, and an absorption tower; the absorbent is inside the absorption tower, the induced draft fan is connected to the airflow pipeline, and the airflow pipeline is connected to the absorption tower and the drum 3.

[0021] Furthermore, in the drum dehydration and drying device of the present invention, the absorption tower includes an air inlet, an air outlet, an absorbent, and a spraying device.

[0022] Furthermore, in the drum dehydration and drying device of the present invention, the absorption tower is selected from wet absorption tower, semi-dry absorption tower and dry absorption tower.

[0023] Furthermore, the absorbent described in this invention is selected from sodium hydroxide, potassium hydroxide, ammonia, calcium oxide, and calcium hydroxide, etc.

[0024] Furthermore, the drum dehydration and drying device and air washing system described in this invention utilize an intelligent control system to intelligently adjust the burner, drum speed, feeding and discharging systems, enabling automated material drying.

[0025] The beneficial effects and novelty of this invention are as follows: The novelty of the drum dryer of this invention lies in its use of a double-drum structure to effectively isolate the contact between the hot fluid and the material, solving the problem of pollution of the material by combustion exhaust gas and hot fluid, and also preventing the exhaust gas and hot fluid from reacting chemically with the material and causing deterioration. A wide variety of heat sources can be utilized, and the gas scrubbing system removes active substances and soot from the flue gas, enabling heat energy recovery and reuse, thus saving energy and reducing emissions. The technical equipment of this invention expands the application range of drum dryers and enhances their functionality. Attached Figure Description

[0026] Figure 1 is a schematic diagram of the drum structure of the drum dehydration and drying device of the present invention.

[0027] Figure 2 This is a schematic diagram of the spiral tube drum 3 of the drum dehydration and drying device involved in the present invention.

[0028] Figure 3 This invention relates to a drum dehydration and drying device containing a washing air system.

[0029] like Figure 1 —3 shows: 1, exhaust pipe; 2, outer cylinder; 3, inner roller; 4, heat source; 5, hot flow nozzle; 6, spiral pipe; 7, spiral pipe inlet; 10, airflow duct; 11, absorption tower; 12, airflow duct; 13, induced draft fan; 14, airflow duct. Detailed Implementation

[0030] To make the content of this invention clearer and more understandable, the technical solution of this invention will be clearly and completely described below with reference to the accompanying drawings. In specific implementation, appropriate drying equipment and drying processes are selected according to the characteristics of the material and heat source.

[0031] Example 1, Combined with appendix Figure 1 In specific implementations of this invention: Figure 1 The drum dehydration and drying device shown has a burner 4 that burns natural gas. The flame heats the drum 3 between the drum 3 and the outer cylinder 2. The outer cylinder 2 is mainly composed of insulating asbestos and refractory bricks. A rotation system drives the drum 3 to rotate, while the outer cylinder 2 is fixed to the support. Magnesium sulfate solution is sprayed into the drum 3 from the left end. The aqueous solution evaporates upon heating, producing solid magnesium sulfate that adheres to the inner wall of the drum. The rotation of the drum drives the internal toothed rollers to roll, causing the solid material to detach from the drum wall and flow into the next section of the drum. Finally, the dried material flows out of the dryer from the right end of the drum 3. By adjusting the drum speed and the heat source temperature, the dehydrated products can be either magnesium sulfate containing water of crystallization or anhydrous magnesium sulfate.

[0032] Example 2, Combined with appendix Figure 1 In specific implementations of this invention: Figure 1 The illustrated drum dehydration and drying device uses fuel gas generated by a biomass gasification furnace, which is burned in burner 4. Burner 4 has five flame nozzles, and the flames heat drum 3 between drum 3 and outer drum 2. Outer drum 2 is mainly composed of insulation cotton and refractory bricks. A rotation system drives drum 3 to rotate, while outer drum 2 is fixed to a support. Sodium sulfate solution is sprayed into the drum of the drum dryer. The aqueous solution evaporates upon heating, producing solid sodium sulfate. The rotating toothed rollers crush the solid material adhering to the drum wall, causing the solid material to detach from the drum wall and flow into the next section of the drum. Finally, the dried material is discharged from the dryer at the tail end of drum 3. By adjusting the drum speed and heat source temperature, the dehydrated products are sodium sulfate containing water of crystallization and anhydrous sodium sulfate, respectively.

[0033] Example 3, Combined with appendix Figure 1 In specific implementations of this invention: Fuel oil enters burner 4 for combustion. Burner 4 has two burners, totaling eight flame nozzles. The flames heat drum 3 between drum 3 and outer drum 2. Outer drum 2 is mainly composed of insulation cotton and refractory bricks. A rotating system drives drum 3 to rotate, while outer drum 2 is fixed to a support. Sodium sulfate crystals are injected. Figure 1 Inside the drum 3 of the drum dryer shown, solid magnesium sulfate is produced by heating and evaporation and adheres to the inner wall of the drum. The inner wall of the drum 3 is equipped with a chain, which causes the solid material to detach from the drum wall. The dehydrated anhydrous sodium sulfate flows out of the dryer at the tail end of the drum 3.

[0034] Example 4, Combined with appendix Figure 1 and Figure 2 Saturated steam at 300 degrees Celsius enters the spiral tube to provide heat energy. The outer cylinder 2 is mainly composed of insulation cotton and refractory bricks; the outer cylinder 2 is fixed to the support. The rotation system drives the drum 3 to rotate. The inner wall of the drum 3 is equipped with a chain. The compound fertilizer enters the drum 3, and after being heated, the water evaporates to obtain fertilizer with a water content of less than 10%, which flows out of the dryer at the tail of the drum 3.

[0035] Example 5, Combined with appendix Figure 1 The drum 3 is heated by an electromagnetic heater, and quicklime enters the drum 3. The rotating system drives the drum 3 to rotate. The inner wall of the drum 3 is equipped with lifting plates and toothed rollers. The outer cylinder 2 is mainly composed of heat insulation cotton and refractory bricks. The quicklime flows out of the dryer at the tail end of the drum 3.

[0036] Example 6, Combined with appendix Figure 1 and Figure 3The drum 3 is heated by gas, and quicklime enters the drum 3. The rotating system drives the drum 3 to rotate. The drum 3 and the outer cylinder 2 are mainly composed of insulation cotton and refractory bricks. The flue gas from the combustion enters the absorption tower through pipes 1 and 10 and reacts with the absorbent lime. The clean hot gas flows into the air inlet of the drum 3 through pipes and induced draft fan. The quicklime flows out of the dryer at the tail of the drum 3.

[0037] Note: The technical features and applications of this invention are not intended to limit the scope of this invention. Any technical modifications or substitutions made within the spirit and scope of the technical solutions and claims involved in this invention fall within the technical scope of this invention.

Claims

1. A drum dehydration and drying device, the main components of which include an inner drum, an outer drum, a support, a heat source, and a rotating system; characterized in that: The inner roller and outer cylinder are mounted on a bracket, with the inner roller being fitted inside the outer cylinder and having the same axial direction, and a gap between the two cylinders; the heat source is placed in the gap between the inner roller and the outer cylinder, and the rotation system drives the inner roller to rotate.

2. The drum dehydration and drying device according to claim 1, the main components include an inner drum, an outer drum, a support, a heat source, a rotation system, and a washing air system; characterized in that: The air washing system is connected to the outer cylinder and inner drum of the dehydration and drying device according to claim 1 via an airflow pipe.

3. The drum dehydration and drying apparatus according to claims 1 and 2, characterized in that: The outer wall of the inner drum of the drying device has a spiral pipe, in which hot fluid flows and transfers heat energy to the inner drum.

4. The drum dehydration and drying apparatus according to claims 1 and 2, characterized in that: The heat source for the drying device is selected from burners, resistance heaters, electromagnetic heating, infrared heating, hot fluids, steam, and hot air.

5. The drum dehydration and drying device according to claim 4, characterized in that: The burner of the drying device is selected from burners for natural gas, biomass pyrolysis gas, fuel gas, coal, coal pyrolysis gas, fuel oil, hydrogen, and ammonia.

6. The drum dehydration and drying apparatus according to claims 1 and 2, characterized in that: The rotation system of the drying device includes a motor and gears, and the rotation system drives the inner drum to rotate.

7. The drum dehydration and drying apparatus according to claims 1 and 2, characterized in that: An exhaust pipe is located at the top of one end of the outer cylinder of the drying device.

8. The drum dehydration and drying apparatus according to claims 1, 2 and 7, characterized in that: The outer cylinder is mainly composed of thermal insulation material, which is selected from heat insulation material and refractory material.

9. The drum dehydration and drying apparatus according to claim 2, characterized in that: The air washing system of the drying device mainly consists of pipelines, induced draft fans, absorption towers, and absorbents.

10. The drum dehydration and drying apparatus according to claim 9, characterized in that: The absorbent for the gas washing system of the drying device is selected from sodium hydroxide, potassium hydroxide, calcium oxide, and calcium hydroxide.

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