A drying device suitable for wet sludge

Abstract

The invention discloses a drying device suitable for wet sludge, comprising a reactor and a thermal dryer, wherein a material inlet and an exhaust pipe are arranged on the top of the reactor; the thermal dryer comprises an inner tank and a sleeve which are coaxially arranged with inner and outer seals, and the inner tank can rotate relative to the sleeve around a central axis; an interlayer channel for an external gas heat source to flow through is formed between the inner wall of the sleeve and the outer wall of the inner tank; a reaction discharge port communicated with the inner tank is provided at the bottom of the reactor; wet sludge and a self-heating drying agent put into the reaction tube from the material inlet undergo a hydration and heat reaction to obtain wet crushed mud, wherein high-temperature water vapor generated by the reaction is discharged from the exhaust pipe to the interlayer channel for recycling as a gas heat source; and the wet crushed mud after the reaction is put into the inner tank from the reaction discharge port, and the wet crushed mud undergoes heat exchange with the gas heat source of the interlayer channel along with the rotation of the inner tank.

Description

Technical Field

[0001] The invention relates to the technical field of sludge treatment equipment, in particular to a drying device suitable for wet sludge. Background Art

[0002] How to effectively recycle and treat wet sludge has always been a topic of continuous research in the field of environmental protection. There are many technical methods being used on the market: drying, incineration, landfill, composting to make organic fertilizer, etc., but the utilization effect is not ideal. Among them, drying and incineration methods consume a lot of energy and have high operating costs; landfilling occupies land and causes secondary pollution; composting to make organic fertilizer has the risk of affecting the quality of crops. These have not achieved the purpose of energy saving, environmental protection, and resource recycling. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a drying device suitable for wet sludge, which has the characteristics of energy saving, environmental protection and high efficiency.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a drying device suitable for wet sludge, comprising a reactor and a thermal dryer, wherein a material inlet and an exhaust pipe are provided at the top of the reactor; the thermal dryer comprises an inner tank and a sleeve which are coaxially arranged with inner and outer seals, and the inner tank can rotate relative to the sleeve around the central axis; an interlayer channel for the external gas heat source to flow through is formed between the inner wall of the sleeve and the outer wall of the inner tank; an air inlet and an air outlet are respectively provided at the front and rear ends of the sleeve, and the air inlet and the air outlet are both communicated with the interlayer channel, and the air inlet is communicated with the exhaust pipe; a reaction discharge port communicated with the inner tank is provided at the bottom of the reactor; wet sludge and a self-heating drying agent put into the reaction cylinder from the material inlet are subjected to hydration and heat reaction to obtain wet crushed mud, wherein the high-temperature water vapor generated by the reaction is discharged from the exhaust pipe to the interlayer channel for recycling as a gas heat source; and the wet crushed mud after the reaction is put into the inner tank from the reaction discharge port, and the wet crushed mud is heat-exchanged with the gas heat source of the interlayer channel along with the rotation of the inner tank.

[0005] Furthermore, a crushing and stirring knife group is provided in the reaction cylinder, wherein the wet sludge and the self-heating drying agent put into the reaction cylinder from the material inlet are crushed and stirred under the action of the crushing and stirring knife group.

[0006] Furthermore, the crushing and mixing blade group is provided with a rotation driving unit for driving it to rotate in a directional manner.

[0007] Furthermore, the discharge port is provided with a discharge gate which can be movably opened and closed.

[0008] Furthermore, the discharging gate is provided with a discharging telescopic unit for driving it to perform a turning motion around a fixed point.

[0009] Furthermore, a spiral tunnel is formed on the inner wall of the inner tank, wherein the wet crushed mud fed into the inner tank from the feed port is spirally transported toward the discharge port along the spiral tunnel.

[0010] Furthermore, the interlayer channel is filled with a heat storage metal mesh, wherein the heat storage metal mesh tightly covers the outer wall of the inner tank.

[0011] Furthermore, the tail end of the inner liner extends outside the sleeve, wherein the overlapping area of ​​the inner liner and the sleeve serves as a heating section, and the area of ​​the inner liner extending outside the sleeve serves as a heat dissipation section, and the outer wall of the sleeve is covered with an insulation layer.

[0012] Furthermore, a suction hood is provided at the rear end of the inner container.

[0013] Furthermore, the inner liner is provided with an inner liner driving unit capable of driving the inner liner to rotate around a central axis.

[0014] The present invention adopts the above-mentioned scheme, and its beneficial effects are: the wet sludge and the self-heating drying agent are crushed and stirred for pre-treatment through the reactor, and then the generated high-temperature water vapor is transported to the interlayer channel for recycling as a gas heat source, so as to facilitate the thermal drying treatment of the wet crushed mud material, and has the characteristics of high efficiency, energy saving, and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the drying device.

[0016] Figure 2 Schematic diagram of a thermal dryer.

[0017] Figure 3 A side view of a thermal dryer.

[0018] Figure 4 for Figure 2 Enlarged view of local A in the figure.

[0019] Figure 5 This is a front cross-sectional view of the reactor.

[0020] Figure 6 A side cross-sectional view of the reactor.

[0021] Among them, 10-thermal dryer, 11-sleeve, 111-air inlet, 112-air outlet, 12-inner tank, 121-feeding port, 122-inner tank outlet, 123-spiral tunnel, 13-heat storage metal mesh, 14-suction hood, 15-negative pressure induced draft fan, 16-inner tank drive unit, 30-insulation layer, 20-reaction cylinder, 201-material inlet, 202-reaction outlet, 21-discharge gate, 211-discharge telescopic unit, 22-crushing and mixing knife group, 221-rotation drive unit, 23-exhaust pipe. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present invention, the present invention is described more fully below with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0023] See attached Figure 1-6 As shown, a drying device suitable for wet sludge includes a reactor and a thermal dryer 10. The reactor includes a reaction tube 20, a crushing and stirring blade group 22 and a rotary drive unit 221, wherein the reaction tube 20 is an elliptical cylindrical structure with a cavity, made of metal, and the outer wall of the tube is covered with an insulation layer to reduce heat loss. The thermal dryer 10 includes an inner tank 12 and a sleeve 11. The outer shapes of the inner tank 12 and the sleeve 11 are both cylindrical structures and are made of metal materials. The sleeve 11 is sleeved on the outer periphery of the inner tank 12 to achieve a coaxial internal and external sealing arrangement of the two. The end of the sleeve 11 and the outer wall of the inner tank 12 can be sealed and connected by setting a sealing block or other sealing method. It is not limited here and can be selected as needed.

[0024] In this embodiment, the crushing and mixing knife group 22 is arranged in the reaction tube 20, wherein the crushing and mixing knife group 22 includes a knife shaft and a plurality of crushing knives mounted on the knife shaft, wherein the knife shaft is arranged to extend in the transverse direction, and its two ends extend through the outside of the reaction tube 20 and are connected to a preset bearing seat to realize the rotation connection between the knife shaft and the reaction tube 20; one end of the knife shaft is connected to the rotation drive unit 221 arranged on the periphery of the reaction tube 20, thereby driving the knife shaft to rotate through the rotation drive unit 221. Secondly, each crushing knife is in an arc shape and its outer end is formed with a horizontal knife extending along the axial direction parallel to the knife shaft,

[0025] Specifically, as the rotary drive unit 221 drives the knife shaft to rotate at high speed, it synchronously drives each crushing knife to rotate rapidly in the reaction tube 20, so as to cut, crush and stir the wet sludge to solve the adhesion problem of the wet sludge. At the same time, the horizontal knife is used to synchronously spread and turn the wet sludge to prevent the wet sludge from clumping.

[0026] Furthermore, the rotation driving unit 221 of this embodiment may adopt a reduction motor.

[0027] In this embodiment, the inner liner 12 can rotate around the central axis relative to the sleeve 11, wherein the inner liner 12 is provided with an inner liner driving unit 16 which can drive it to rotate around the central axis. Specifically, the inner liner driving unit 16 of this embodiment includes an inner liner 12 reduction motor and a transmission gear sleeved on the inner liner 12. A driving gear is sleeved on the output shaft of the inner liner 12 reduction motor, and the driving gear is meshed with the transmission gear for transmission. Thus, the inner liner 12 is driven by the inner liner 12 reduction motor to rotate.

[0028] In this embodiment, the top material inlet 201 of the reaction cylinder 20 leads to at least one exhaust pipe 23, wherein the material inlet 201 is used to put wet sludge and self-heating drying agent into the reaction cylinder 20. One or more material inlets 201 can be set according to actual conditions. The wet sludge and the self-heating drying agent can be put in through the same material inlet 201 or through different material inlets 201. It can be selected as needed and is not limited here.

[0029] In this embodiment, an interlayer channel is formed between the inner wall of the sleeve 11 and the outer wall of the inner liner 12, and the interlayer channel can be used for the external gas heat source to flow through. The gas heat source can release heat in the interlayer channel, so that the heat energy is transmitted to the inner cavity through the outer wall of the inner liner 12. Specifically, the front and rear ends of the sleeve 11 are respectively provided with an air inlet 111 and an air outlet 112, and the air inlet 111 is connected to the exhaust pipe 23, so that the high-temperature water vapor discharged from the exhaust pipe 23 can be sent into the interlayer channel as a gas heat source through the air inlet 111, and the air outlet 112 can be externally connected to the negative pressure induced draft fan 15, and the gas heat source is discharged from the air outlet 112 after passing through the interlayer channel through the negative pressure.

[0030] In this embodiment, a reaction discharge port 202 is provided at the bottom of the reaction cylinder 20, wherein the reaction discharge port 202 is provided with a discharge gate 21 that can be movably opened and closed. Specifically, the discharge gate 21 is provided with a discharge telescopic unit 211 that drives it to perform a flipping action around a fixed point. The discharge telescopic unit 211 of this embodiment is preferably a telescopic cylinder, the tail end of which is hinged on the outer wall of the reaction cylinder 20 and the telescopic end of which is hinged to a rotating lever arm preformed on the discharge gate 21, and the rotating lever arm is hinged on the outer wall of the reaction cylinder 20 at a fixed point. Thus, the discharge gate 21 is flipped around a fixed point by the telescopic action of the discharge telescopic unit 211, thereby realizing the opening / closing action of the reaction discharge port 202.

[0031] In this embodiment, a feed port 121 and a tank outlet port 122 are respectively provided at both ends of the inner tank 12, wherein the feed port 121 is used to put wet crushed mud into the inner tank 12, and the tank outlet port 122 is used to discharge the processed crushed mud material. Specifically, the feed port 121 of the inner tank 12 is connected to the reaction outlet port 202 of the reaction barrel 20, so that the wet crushed mud processed by the reaction barrel 20 can be put into the inner tank 12 through the feed port 121.

[0032] In this embodiment, the inner wall of the inner liner 12 is formed with a spiral tunnel 123. Through the rotation of the inner liner 12 and the coordination of the spiral tunnel 123, the wet crushed mud delivered from the feed port 121 into the inner liner 12 can be spirally transported along the spiral tunnel 123 toward the inner liner discharge port 122. At the same time, the wet crushed mud will continuously contact the heated inner wall of the inner liner 12 during transportation, so that the wet crushed mud can exchange heat with the gas heat source of the interlayer channel through the inner liner 12 during transportation, so that the remaining moisture in the wet crushed mud can be evaporated by absorbing heat.

[0033] In order to facilitate the understanding of the above-mentioned reactor, further explanation is given below in combination with the specific working principle.

[0034] When working, first close the discharge gate 21 and start the rotary drive unit 221; then, the wet sludge and the self-heating desiccant are put into the reaction barrel 20 from the material inlet 201, and the crushing and stirring knife group 22 will crush and stir the wet sludge, and the self-heating desiccant will fully contact with the water in the wet sludge to produce a hydration and exothermic reaction, thereby releasing a large amount of heat to cause the wet sludge to quickly heat up to above 80°C, so that the water in the wet sludge is heated and evaporated to convert into high-temperature water vapor; with the continuous crushing and stirring action of the crushing and stirring knife group 22, the wet sludge and the self-heating desiccant can be fully mixed and reacted; during this period, a large amount of water vapor generated can be discharged from the reaction barrel 20 through the exhaust pipe 23 (the heat energy of the water vapor can be recycled or treated for environmental protection); finally, when the predetermined stirring and crushing effect or time is achieved, the discharge gate 21 can be opened to discharge the wet crushed sludge and other materials from the discharge port.

[0035] In this embodiment, the self-heating drying agent used is composed of inorganic minerals and metal powders, and its main material components include calcium carbonate, ferric oxide and aluminum powder, and the proportion of its components is determined by the water content of the actual wet sludge, which is not limited here. Specifically, calcium carbonate will produce a hydration reaction when in contact with water, which has the characteristics of exothermic temperature rise, so that the temperature in the reaction tube 20 first reaches above 80°C, which serves as the excitation temperature of the subsequent thermite reaction, and aluminum powder and ferric oxide can produce a thermite reaction at a higher excitation temperature, which causes the temperature in the reaction tube 20 to rise again to above 150°C, thereby accelerating the evaporation of water. At the same time, the high temperature generated can kill the bacteria contained in the wet sludge at high temperature, and finally achieve the purpose of deodorization, sterilization, and water evaporation.

[0036] In this embodiment, the usage of aluminum powder and ferric oxide in the self-heating drying agent is 1-5% and 3-10% respectively. The usage is relatively small, which means that the excitation temperature required for the thermite reaction does not need to be too high, and uncontrollable heat energy generated by excessive thermite reaction can be avoided, thereby ensuring the safety performance of the reactor.

[0037] In this embodiment, in order to improve the heat conduction effect of the gas heat source in the interlayer channel, a heat storage metal mesh 13 can be filled in the interlayer channel, wherein the heat storage metal mesh 13 is closely wrapped around the outer wall of the inner liner 12, and utilizes the thermal conductivity and heat storage of the metal material to absorb the heat energy of the gas heat source and conduct it to the inner liner 12. The heat storage metal mesh 13 of this embodiment is a honeycomb aluminum alloy mesh.

[0038] In this embodiment, the wet crushed mud material is thermally dried by releasing heat in the interlayer channel through a gas heat source, and the wet crushed mud material is converted into a dried crushed mud material with a moisture content of less than 40%.

[0039] In this embodiment, the tail end of the inner liner 12 extends to the outside of the sleeve 11, wherein the overlapping area of ​​the inner liner 12 and the sleeve 11 serves as a heating section, and the crushed mud material in the heating section continuously exchanges heat with the gas heat source, thereby achieving a thermal drying effect; and the area where the inner liner 12 extends to the outside of the sleeve 11 serves as a heat dissipation section, and the outer wall of the inner liner 12 at the heat dissipation end is directly exposed to the air. At this time, the heat of the crushed mud material and the inner liner 12 can be dissipated into the air, thereby achieving a heat dissipation and cooling effect.

[0040] Furthermore, the outer wall of the sleeve 11 is coated with a heat-insulating layer 30 to reduce heat loss in the heating section.

[0041] In this embodiment, a suction hood 14 is provided at the tail end of the inner liner 12, wherein the suction hood 14 is sleeved on the tail end of the inner liner 12 and the inner liner 12 can rotate relative to the suction hood 14. At this time, the suction hood 14 is externally connected to the negative pressure draft fan 15 through a pipeline, and the wet vapor and residual odor in the inner liner 12 are sucked out by the negative pressure suction effect.

[0042] Furthermore, the wet steam, odor in the inner tank 12 and the gas heat source in the interlayer channel can be discharged by the negative pressure draft fan 15 to a separately configured environmental protection treatment device (not shown) for environmental protection treatment, which is not limited here.

[0043] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any technician familiar with the art who, without departing from the scope of the technical solution of the present invention, makes more possible changes and modifications to the technical solution of the present invention using the technical content disclosed above, or modifications are all equivalent embodiments of the present invention. Therefore, any equivalent and equivalent changes made according to the ideas of the present invention without departing from the content of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A drying device suitable for wet sludge, characterized in that: The invention comprises a reactor and a thermal dryer (10), wherein a material inlet (201) and an exhaust pipe (23) are provided at the top of the reactor; the thermal dryer (10) comprises an inner liner (12) and a sleeve (11) which are coaxially arranged with inner and outer seals, and the inner liner (12) can rotate around a central axis relative to the sleeve (11); an interlayer channel is formed between the inner wall of the sleeve (11) and the outer wall of the inner liner (12); an air inlet (111) and an air outlet (112) are respectively provided at the front and rear ends of the sleeve (11), and the air inlet (111) and the air outlet (112) are both connected to the interlayer channel. The air inlet (111) is connected to the exhaust pipe (23); the bottom of the reactor is provided with a reaction outlet (202) connected to the inner tank (12); wet sludge and a self-heating drying agent are introduced into the reaction cylinder (20) from the material inlet (201) for hydration and heat reaction to obtain wet crushed sludge, wherein high-temperature water vapor generated by the reaction is discharged from the exhaust pipe (23) to the interlayer channel for recycling; and the wet crushed sludge after the reaction is introduced into the inner tank (12) from the reaction outlet (202), and the wet crushed sludge is heat-exchanged with the gas heat source of the interlayer channel as the inner tank (12) rotates.

2. A drying device suitable for wet sludge according to claim 1, characterized in that: The reaction cylinder (20) is provided with a crushing and stirring blade group (22), wherein wet sludge and self-heating drying agent introduced into the reaction cylinder (20) from the material inlet (201) are crushed and stirred under the action of the crushing and stirring blade group (22).

3. A drying device suitable for wet sludge according to claim 2, characterized in that: The crushing and stirring blade group (22) is provided with a rotation driving unit (221) for driving it to rotate in a directional manner.

4. A drying device for wet sludge according to claim 1, characterized in that: The discharge port is provided with a discharge gate (21) which can be movably opened and closed.

5. A drying device for wet sludge according to claim 4, characterized in that: The discharge gate (21) is provided with a discharge telescopic unit (211) for driving it to perform a turning motion around a fixed point.

6. A drying device for wet sludge according to claim 1, characterized in that: The inner wall of the inner container (12) is formed with a spiral tunnel (123), wherein the wet crushed mud delivered into the inner container (12) from the feed port (121) is spirally transported along the spiral tunnel toward the discharge port.

7. A drying device for wet sludge according to claim 1, characterized in that: The interlayer channel is filled with a heat storage metal mesh (13), wherein the heat storage metal mesh (13) closely covers the outer wall of the inner container (12).

8. The drying device for wet sludge according to claim 1, characterized in that: The rear end of the inner liner (12) extends outside the sleeve (11), wherein the overlapping area of ​​the inner liner (12) and the sleeve (11) serves as a heating section, and the area of ​​the inner liner (12) extending outside the sleeve (11) serves as a heat dissipation section, and the outer wall of the sleeve (11) is coated with a thermal insulation layer (30).

9. A drying device for wet sludge according to claim 1, characterized in that: A suction hood (14) is provided at the rear end of the inner container (12).

10. The drying device for wet sludge according to claim 1, characterized in that: The inner container (12) is provided with an inner container driving unit (16) capable of driving the inner container to rotate around a central axis.

Images