CN115751923A - Four-layer spiral turn-back material conveying type hot gas flow-through dehumidifier and four-step filter cake dehumidification method - Google Patents
Four-layer spiral turn-back material conveying type hot gas flow-through dehumidifier and four-step filter cake dehumidification method Download PDFInfo
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Abstract
The invention relates to a four-layer spiral turn-back material conveying type hot gas flow-through dehumidifier and a four-step dehumidification method of a filter cake, wherein the dehumidifier comprises a four-layer material conveying mechanism, a laminated frame, a hot air blower and a dust bag; each layer of material conveying mechanism is a spiral conveyor with a hot air channel, and the four layers of material conveying mechanisms are integrated into a whole by the laminated frame; the dehumidifier is directly and vertically butted with the filter cake output machine to replace a closed filter cake dryer, so that a filter cake transfer elevator is omitted, the working procedures of stirring, crushing and slitting the filter cake are simplified, and the post-treatment process of the filter cake is optimized; the four-layer steel spiral material conveying mechanism equivalently replaces a double-layer mesh belt material conveying mechanism of the dryer, so that the service life of key parts is prolonged. A filter cake four-step dehumidification method comprises the steps of inputting 90 ℃ hot gas by using the dehumidifier, carrying out high-temperature evaporation drying to replace low-temperature condensation dehumidification to minimize energy consumption, carrying out four-time heat exchange between the hot gas returning and flowing through four-layer material conveying mechanism and a filter cake, carrying out four-step dehumidification by comprehensively, uniformly and repeatedly heating four-layer wet filter cakes, and dehumidifying the wet filter cake with the water content of 30-50% into a dry filter cake with the water content of 10-30%.
Description
Technical Field
The invention belongs to the technical field of filter cake dryers of filter press units, and relates to a spiral hot-air type filter cake dehumidifier and a dehumidification method thereof.
Background
The filter press is a pressurized filtering device with multiple filtering chambers operated intermittently; a large filter press having an effective filter area of 1000-2000m and a filter plate size of 3000mm × 3000mm to 3200mm × 3200 mm; the device is suitable for solid-liquid separation of various large-quantity suspension materials (namely, a mixture of liquid and solid particles); the water content of filter cakes of a common filter press is 30-50% (different materials have different water contents), and if a diaphragm filter press is used, the water content can be reduced by only 10%; according to the requirements of different materials, subsequent drying treatment is required, and the water content of the filter cake is further reduced so as to facilitate storage or outward transportation.
The filter press unit, namely a material filter-pressing and drying unit, mainly comprises a filter press, a material mixing tank and a flocculation stirrer thereof, a material delivery pump, an air compressor, a hydraulic station, a filtrate tank, a filter cake horizontal output machine (such as a screw conveyor), a filter cake transfer elevator (such as a scraper conveyor) and a closed filter cake dryer; generally, the filter press is arranged on the second floor, the filter cake horizontal output machine is arranged below the filter press, the closed filter cake dryer is arranged beside the filter cake horizontal output machine, and the filter cake transfer elevator is communicated with the filter cake horizontal output machine and the closed filter cake dryer. The material treatment process comprises the following steps: material mixing pool → material transfer pump → filter press → filter cake horizontal output machine → filter cake transfer elevator → closed filter cake dryer.
The drier is a mechanical device which reduces the moisture of materials by using heat energy; the filter cake dryer is continuous drying equipment for carrying out subsequent treatment on the filter cake formed by the operation of the filter press; the closed filter cake dryer is a normal pressure continuous convection type full-closed environment-friendly filter cake dryer; the device mainly comprises a closed box body, a filter cake crushing and slitting mechanism, a double-layer mesh belt material conveying mechanism, a high-low temperature drying system, a dry material spiral output mechanism and a PLC program control system; the method is suitable for drying wet filter cake materials with the water content of 30-50% into dry filter cake strips with the water content of 10-30% (the drying rate is freely adjustable). Because wet cake drying processes are dusty, closed cake dryers, such as "a high and low temperature cake dryer" are commonly used (patent No. CN 201721372460.2); some materials also use flash dryers.
The existing material filter pressing and drying unit has the following defects: (1) The process equipment is more, the equipment investment is higher, and the failure rate is higher; (2) The unit equipment is loosely arranged, the closed filter cake dryer and the filter cake horizontal output machine cannot be vertically butted, the occupied area is large, and the factory investment is high; (3) The closed filter cake dryer has a complex structure, such as a filter cake crushing and strip cutting mechanism; (4) The double-layer material conveying mesh belt of the closed filter cake dryer belongs to a quick-wear part, and has short service life and high maintenance cost; (5) The drying mode of the closed filter cake dryer, namely the high-temperature evaporation drying and low-temperature condensation dehumidification combined mode has higher energy consumption; the requirements of optimization of the process, unit integration, simplification of the structure, longest service life, minimized energy consumption, minimized cost and maximized efficiency of large-scale modern sewage treatment engineering (easy-winding sludge drying) cannot be met.
Disclosure of Invention
The invention aims to overcome the defects of the existing material filter pressing and drying unit, solve the technical problems of long process, various devices, loose unit, complex structure, easy damage of mesh belt and high energy consumption in large-scale sewage treatment engineering, how to reasonably omit elements (filter cake transfer elevator) to optimize the process, how to organically vertically butt the filter cake dryer, the filter cake horizontal output machine and the filter press to integrate main equipment of the unit and minimize the occupied area, how to reasonably omit a sludge filter cake stirring and slitting mechanism to simplify the structure of the drying equipment, how to equivalently replace a double-layer material conveying mesh belt to maximize the service life of key parts, and how to optimize the drying mode to minimize the energy consumption, and provide a four-layer spiral turn-back material conveying type hot gas flow-through dehumidifier and a four-step filter cake dehumidification method; the invention relates to a filter cake four-step dehumidifying method, in particular to a filter cake four-step dehumidifying method using a four-layer spiral turn-back material conveying type hot gas flow-through dehumidifier, which is called for short because the number of characters of a patent name is limited.
The invention solves the problems of the prior art and adopts the innovative technical scheme that: compared with the prior art, the innovative overall structure of the four-layer spiral foldback and conveying type hot air flow-through dehumidifier (hereinafter referred to as a four-layer spiral filter cake dehumidifier) has the key points of the overall technical scheme that: (1) optimizing a machine set: a four-layer spiral filter cake dehumidifier is created to replace a closed filter cake dryer and is directly and vertically butted with a filter cake spiral output machine, so that a filter cake transfer hoisting machine is reasonably omitted, the post-treatment process of a filter cake is optimized, main equipment is relatively integrated, and the occupied area is minimized; (2) host optimization: the four-layer spiral filter cake dehumidifier comprises an upper layer material conveying mechanism, a middle layer material conveying mechanism, a lower layer material conveying mechanism, a laminated frame, a hot air blower and a dust bag; each layer of material conveying mechanism is a closed dry type shaftless screw conveyor, and the structure is simple; compared with a closed filter cake dryer, the four-layer steel shaftless spiral body equivalently replaces a double-layer mesh belt material conveying mechanism, so that the service life of key parts is prolonged, and meanwhile, a sludge filter cake crushing and slitting mechanism and a filter cake crushing and slitting process are reasonably omitted, so that the structure and the process of drying equipment are simplified; (3) optimization of drying mode: a high-temperature evaporation drying mode of a filter cake in a hot gas return flow-through four-layer material conveying mechanism is adopted to replace a low-temperature condensation dehumidification mode, so that the energy consumption is minimized; therefore, the technical problems of long process, multiple equipment, loose unit, complex structure, easy damage of mesh belt and high energy consumption of large-scale sewage treatment engineering are solved.
The specific design scheme of the invention is as follows: (1) The upper layer material conveying mechanism is a fourth layer closed dry type shaftless screw conveyor and comprises a driving motor, a U-shaped material conveying groove, a shaftless screw body, an angle steel type support, a material inlet, a material outlet, a hot air inlet and a material conveying groove cover plate; the U-shaped conveying chute is a U-shaped wear-resistant conveying chute, is 50mm higher than the U-shaped conveying chute of a common single-function screw conveyor and is used as a hot air channel; the shaftless spiral body is arranged, so that the sludge filter cake can be prevented from winding, and the conveying efficiency is improved; (2) The middle layer material transfer mechanism is a second layer closed dry shaftless screw conveyor and a third layer closed dry shaftless screw conveyor, the number of the hot air inlets is less than that of the upper layer material transfer mechanism, and the material inlet and the material outlet of the adjacent material transfer mechanisms are mutually corresponding; (3) The lower layer material conveying mechanism is a first layer closed dry type shaftless screw conveyor, a left end air outlet is additionally arranged on the basis of the middle layer material conveying mechanism, and a feed inlet of the left end air outlet corresponds to a discharge outlet of the second material conveying mechanism; (4) The laminated rack is shared by four layers of material conveying mechanisms and comprises a rack main body and an angle steel type support; the frame main body is a frame type frame main body and comprises three stand columns, two cross beams and two stable inclined ribs, the length of the frame main body corresponds to that of each layer of material conveying mechanism, and the height of the frame main body corresponds to the total height of the four layers of material conveying mechanisms; four angle steel formula support alternate welding on the stand of frame main part, its interval and individual layer pass the height of material mechanism corresponding (guarantee adjacent material mechanism's feed inlet and discharge gate butt joint), so form the range upon range of formula frame.
The connection relation of the main parts of the invention is as follows: for convenience of explanation, a filter cake spiral output machine closely related to the invention is additionally arranged; (1) Assembly of the invention: because the four-layer spiral filter cake dehumidifier is higher, a horizontal assembly method is adopted for convenient assembly, the four-layer material conveying mechanisms are sequentially connected into a whole by utilizing a double-layer stacked type frame, the feed inlets and the discharge outlets of the adjacent material conveying mechanisms are accurately butted, and then the horizontal type is righted to be vertical, so that a four-layer spiral filter cake dehumidifier main body is formed; when the assembly is carried out, the hot air blower and the dust bag are arranged at corresponding positions to form a four-layer spiral filter cake dehumidifier which has the function of hot air dehumidification and drying of filter cakes (easily-wound sludge) which are transmitted back and forth; (2) final assembly of the invention: the four layers of spiral filter cake dehumidifiers are integrally arranged below the filter cake spiral output machine, a feed inlet of an upper layer material conveying mechanism of the four layers of spiral filter cake dehumidifiers is butted with a discharge outlet of the filter cake spiral output machine, a hot air machine of the four layers of spiral filter cake dehumidifiers is communicated with a hot air source, and driving motors of all layers of the four layers of spiral filter cake dehumidifiers are communicated with a PLC program control system; the filter cake outward transport equipment corresponds to the discharge hole of the lower layer material conveying mechanism.
The invention also provides a four-step dehumidification method of the filter cake, namely the four-step dehumidification method of the high-temperature evaporation drying type filter cake of the four-layer spiral turn-back material conveying type hot gas flow-through dehumidifier of the invention, in order to make the process complete, the processes of pulling plate cake unloading and filter cake outputting which are closely related to the filter cake dehumidification are additionally arranged; under the control of the PLC program control system; the four-layer spiral filter cake dehumidifier, the filter cake spiral output machine and the pull plate cake unloading mechanism of the large-scale filter press work intermittently and synchronously, and the specific process flow of the filter cake four-step dehumidifying method is as follows: (1) plate pulling and cake unloading: after the filtration is finished, a pulling plate cake-unloading mechanism of the large-scale filter press pulls open a filter plate to unload cakes, and a material guide device guides wet filter cakes to a cover-free filter cake spiral output machine; (2) inputting filter cakes: a filter cake spiral output machine horizontally inputs the wet filter cake with the water content of 30-50% into an upper layer material conveying mechanism; (3) dehumidifying filter cakes: the four-layer spiral filter cake dehumidifier returns to transmit wet filter cakes, the hot air blower inputs high-temperature hot air of 90 ℃ into the upper-layer material conveying mechanism, the hot air returns to flow through the four-layer material conveying mechanism and carries out four-time heat exchange (four-step dehumidification) with the filter cakes, the four-layer wet filter cakes are comprehensively, uniformly and repeatedly heated, water in the wet filter cakes is evaporated into water vapor by heat and discharged from a gas outlet, and the wet filter cakes are dehumidified into dry filter cakes with the water content of 10% -30% and are output from a discharge port of the lower-layer material conveying mechanism on an outward conveying device.
The invention provides a four-layer spiral turn-back material conveying type hot gas flow-through dehumidifier and a four-step filter cake dehumidifying method, which have the prominent substantive characteristics and remarkable progress that: (1) By creating a four-layer spiral filter cake dehumidifier which is directly and vertically butted with a filter cake spiral output machine to replace a closed filter cake dryer, and reasonably omitting a filter cake transfer hoisting machine, the post-treatment process of a filter cake is optimized, main equipment is relatively integrated, and the occupied area is minimized; (2) By arranging the four layers of steel shaftless spiral material conveying mechanisms, the closed filter cake dryer double-layer mesh belt material conveying mechanisms are equivalently replaced, the service life of key parts is prolonged, and meanwhile, the sludge filter cake crushing and slitting mechanism and the filter cake crushing and slitting process are reasonably omitted, and the structure and the process of drying equipment are simplified; (3) A high-temperature evaporation drying mode of a filter cake in a hot gas back-turn flow-through four-layer material conveying mechanism replaces a low-temperature condensation dehumidification mode, so that the energy consumption is minimized; the effect and efficiency of dehumidification and drying of the sludge filter cake are improved; the requirements of optimization of the process of large-scale modern sewage treatment engineering (easy winding sludge drying), unit integration, simplification of the structure, longest service life, minimized energy consumption, minimized cost and maximized efficiency are met; represents the development trend of a sludge filter cake dehumidifier, and has remarkable technical effect.
Drawings
FIG. 1 is a front view of a four-tier spiral cake dehumidifier of the present invention.
FIG. 2 is a side view of a four-tier spiral cake dehumidifier of the present invention.
FIG. 3 is a front view of a stacked frame of the four-tier spiral filter cake dehumidifier of the present invention.
FIG. 4 is a side view of a stacked frame of the four-tier spiral filter cake dehumidifier of the present invention.
FIG. 5 is a schematic view of an upper layer material conveying mechanism of the four-layer spiral filter cake dehumidifier of the present invention.
FIG. 6 is a schematic view of a middle layer material transfer mechanism of the four-layer spiral filter cake dehumidifier of the present invention.
FIG. 7 is a schematic view of a lower layer material conveying mechanism of the four-layer spiral filter cake dehumidifier of the present invention.
FIG. 8 is a schematic view of the main equipment assembly of the four-layer spiral filter cake dehumidifier and the corresponding filter press unit.
Reference numerals: 1-upper layer material conveying mechanism, 2-middle layer material conveying mechanism, 3-lower layer material conveying mechanism, 4-stacked type frame, 5-frame main body, 6-angle steel type support, 7-feeding hole, 8-discharging hole, 9-hot air inlet, 10-material conveying trough cover plate, 11-air outlet, 12-four layers of spiral filter cake dehumidifier (the invention), 13-material guiding device, 14-filter cake spiral output machine, 17-large-scale filter press and 18-PLC program control system.
The four-layer material conveying mechanism comprises 1-an upper layer material conveying mechanism, 2-a middle layer material conveying mechanism and 3-a lower layer material conveying mechanism.
Detailed Description
The technical solution in the embodiment of the present invention is described below with reference to the drawings in the embodiment of the four-layer spiral-fold material-returning type hot-gas flow-through dehumidifier and the four-step filter cake dehumidifying method of the present invention, and the described embodiment is only a part of preferred embodiments of the present invention, but not all embodiments. Based on the embodiment of the present invention, all other embodiments without creativity, such as a four-layer spiral filter cake dehumidifier with the same folding and returning material conveying mode and the hot air flow-through drying mode and the similar structure, which are made by the technical personnel in the field belong to the protection scope of the present invention.
Example 1
A four-layer spiral turn-back material conveying type hot gas flow-through dehumidifier 12 (for short: a four-layer spiral filter cake dehumidifier) has the key points of the innovative overall implementation scheme that: (1) optimizing a machine set: a four-layer spiral filter cake dehumidifier 12 is created to replace a closed filter cake dryer and is directly and vertically butted with a filter cake spiral output machine 14, so that a filter cake transfer hoisting machine is reasonably omitted, the post-treatment process of the filter cake is optimized, the main equipment is relatively integrated, and the occupied area is minimized; (2) host optimization: a four-layer spiral filter cake dehumidifier 12, which comprises an upper layer material conveying mechanism 1, a middle layer material conveying mechanism 2, a lower layer material conveying mechanism 3, a laminated frame 4, a hot air blower and a dust bag; each layer of material conveying mechanism is a closed dry type shaftless screw conveyor, and the structure is simple; compared with a closed filter cake dryer, the four-layer steel shaftless spiral body equivalently replaces a double-layer mesh belt material conveying mechanism, so that the service life of key parts is prolonged, and meanwhile, a sludge filter cake stirring and slitting mechanism and a sludge filter cake stirring and slitting process (a spiral body is used for stirring and slitting a filter cake) are reasonably omitted, so that the structure and the process of drying equipment are simplified; and (3) optimizing a drying mode: a high-temperature evaporation drying mode of filter cakes in a hot-gas back-turning flow-through four-layer material conveying mechanism 1-3 is adopted to replace a low-temperature condensation dehumidification mode, so that the energy consumption is minimized; specific embodiments are described in detail below.
The upper-layer material conveying mechanism 1 is a fourth-layer closed dry shaftless screw conveyor and comprises a driving motor, a U-shaped material conveying groove, a shaftless screw body, an angle steel type support 6, a material inlet 7, a material outlet 8, a hot air inlet 9 and a material conveying groove cover plate 10; the U-shaped conveying chute is a U-shaped wear-resistant conveying chute, is 50mm higher than the U-shaped conveying chute of a common single-function screw conveyor and is used as a hot air channel; the shaftless spiral body is arranged, so that the sludge filter cake can be prevented from winding, and the conveying efficiency is improved; and the angle iron type support 6 is arranged on the fourth layer of angle iron type support 6 of the stacked frame 4 and is used for butting against a filter cake spiral output machine 14, receiving and conveying wet filter cakes and providing a hot air channel.
The middle layer material transfer mechanism 2 is a second and a third layer closed dry type shaftless screw conveyor, and has less hot air inlets 9 than the upper layer material transfer mechanism 1, and the feed inlet 7 and the discharge outlet 8 of the adjacent material transfer mechanisms are corresponding to each other; the angle steel type supports 6 are respectively arranged on the second layer and the third layer of the stacked frame 4 and are used for butt joint of the upper layer and the lower layer material conveying mechanisms 1 and 3, relay transmission of filter cakes, hot air passage providing, expansion of the contact surface of hot air and the filter cakes and heat exchange time, and improvement of dehumidification and drying effects and efficiency of the filter cakes.
The lower layer material conveying mechanism 3 is a first layer closed dry type shaftless screw conveyor, a left end air outlet 11 is additionally arranged on the basis of the middle layer material conveying mechanism 2, and a feed inlet 7 of the lower layer material conveying mechanism corresponds to a discharge outlet 8 of the second layer material conveying mechanism 2; the device is arranged on a first layer of angle steel type support 6 of the laminated frame 4 and is used for butting a second layer of material conveying mechanism 2, transferring in a relay way, outputting a dry filter cake, providing a hot gas channel, further enlarging the contact surface of hot gas and the filter cake and the heat exchange time, and further improving the dehumidifying and drying effect and efficiency of the filter cake.
The laminated frame 4 is a laminated frame 4 shared by four layers of material conveying mechanisms and comprises a frame main body and an angle steel type support 6; the frame main body is a frame type frame main body and comprises three upright posts, two cross beams and two stable inclined ribs, the length of the frame main body corresponds to that of each layer of material conveying mechanism, and the height of the frame main body corresponds to the total height of four layers of material conveying mechanisms; four angle steel type supports 6 are respectively welded on the upright posts of the frame main body at intervals, the distance between the four angle steel type supports corresponds to the height of the single-layer material conveying mechanism (the butt joint of the feed inlet 7 and the discharge outlet 8 of the adjacent material conveying mechanisms is ensured), and the laminated frame 4 is formed in such a way; the double-layer stacked frame 4 connects the four-layer material conveying mechanisms 1-3 into a whole in sequence and is used for integrating the four-layer material conveying mechanisms into a four-layer spiral filter cake dehumidifier main body.
The invention comprises the following steps: because the four-layer spiral filter cake dehumidifier 12 is higher, a horizontal assembly method is adopted for convenient assembly, the four-layer material conveying mechanisms 1-3 are connected into a whole in sequence by utilizing the double-layer stacked type frame 4, the feed inlet 7 and the discharge outlet 8 of the adjacent material conveying mechanisms are precisely butted, and then the horizontal type is righted to be vertical, so that a four-layer spiral filter cake dehumidifier main body is formed; when the assembly is finished, the hot air blower is arranged at the hot air inlet 9, the dust-proof bag is arranged at the air outlet 11, a four-layer spiral filter cake dehumidifier 12 is formed, and the four-layer spiral filter cake dehumidifier has the function of performing hot air dehumidification and drying on filter cakes (easily-wound sludge) which are turned back and conveyed.
The final assembly of the invention: the four layers of spiral filter cake dehumidifiers 12 are integrally arranged below the filter cake spiral output machine 14, a feed inlet 7 of the upper layer material conveying mechanism 1 is in butt joint with a discharge outlet 8 of the filter cake spiral output machine 14, the hot air machine is communicated with a hot air source, and the driving motors and the hot air machines of all the layers are respectively communicated with the PLC program control system 18; the filter cake outward conveying equipment corresponds to the discharge hole 8 of the lower layer material conveying mechanism 3. The wet filter cake with the water content of 30-50% can be dehumidified by inputting hot air with the temperature of 90 ℃ into a dry filter cake with the water content of 10% -30%, and the dry filter cake is output to an outward transportation device.
The invention provides a four-layer spiral turn-back material conveying type hot air flow-through dehumidifier 12, which has the prominent substantive characteristics and remarkable progress that: (1) By creating a four-layer spiral filter cake dehumidifier 12 which is directly and vertically butted with a filter cake spiral output machine 14, a closed filter cake dryer is replaced, and a filter cake transfer hoisting machine is reasonably omitted, so that the post-treatment process of the filter cake is optimized, the main equipment is relatively integrated, and the occupied area is minimized; (2) By arranging the four layers of steel shaftless spiral material conveying mechanisms, the closed filter cake dryer double-layer mesh belt material conveying mechanisms are equivalently replaced, the service life of key parts is prolonged, and meanwhile, the sludge filter cake crushing and slitting mechanism and the filter cake crushing and slitting process are reasonably omitted, and the structure and the process of drying equipment are simplified; (3) A low-temperature condensation dehumidification mode is replaced by a high-temperature evaporation drying mode for creating a filter cake in the hot-gas reentry flow-through four-layer material conveying mechanism 1-3, so that the energy consumption is minimized; the effect and efficiency of dehumidification and drying of the sludge filter cake are improved; the technical problems of long process, multiple equipment, loose unit, complex structure, easy damage of mesh belt and high energy consumption of large-scale sewage treatment engineering are solved; the requirements of users of large-scale modern sewage treatment projects on cost reduction and efficiency improvement are met; represents the development trend of a sludge filter cake dehumidifier and has remarkable technical effect.
Example 2
A four-step dehumidification method of filter cake, namely use the four-layer spiral turn back the material transporting type hot gas of the invention to flow through the four-step dehumidification method of filter cake of the dehumidifier 12 (for short: four layers of spiral filter cake dehumidifiers), in order to make the process complete, add and remove cake and export the filter cake process with the pulling plate closely related to filter cake dehumidification; under the control of the PLC program control system 18; the four-layer spiral filter cake dehumidifier 12, the filter cake spiral output machine 14 and the pull plate cake unloading mechanism of the large-scale filter press 17 work intermittently and synchronously, and the specific process flow of the filter cake four-step dehumidification method is as follows:
(1) Pulling a plate and unloading a cake: after the filtration is finished, a plate pulling and cake unloading mechanism of the large-scale filter press 17 pulls open a filter plate and unloads cakes, and the material guide device 13 guides the wet filter cakes to fall into the cover-free filter cake spiral output machine 14;
(2) Inputting a filter cake: the filter cake spiral output machine 14 horizontally inputs the wet filter cake with the water content of 30-50% into the upper-layer material conveying mechanism 1;
(3) Dehumidifying a filter cake: while the four-layer spiral filter cake dehumidifier 12 returns and transmits the wet filter cake, the adopted four-step dehumidification method of the high-temperature evaporation drying type filter cake is as follows:
the first step, connect material and admit air: the upper layer material conveying mechanism 1 (a fourth layer material conveying mechanism) receives and conveys wet filter cakes of the filter cake spiral output machine 14, and the shaftless spiral body stirs the large filter cakes to fully expose water in gaps of the filter cakes; meanwhile, the hot air blower inputs high-temperature hot air of 90 ℃ into the upper layer material conveying mechanism 1, most hot air flow enters the middle layer material conveying mechanism 2 and the lower layer material conveying mechanism 3 forwards through a hot air channel, and a small part of hot air exchanges heat with the filter cake in the upper layer material conveying mechanism 1 for the first time;
step two, secondary dehumidification: the third layer of the material conveying mechanism of the middle layer of the material conveying mechanism 2 is used for relaying, turning back and transmitting filter cakes; half hot air flow continuously enters the second layer material conveying mechanism and the lower layer material conveying mechanism 3 of the middle layer material conveying mechanism 2 forwards through the hot air channel, part of hot air and the filter cake in the third layer material conveying mechanism carry out secondary heat exchange, the contact surface and the heat exchange time of the hot air and the filter cake are expanded for the second time, and the dehumidifying and drying effect and the dehumidifying and drying efficiency of the filter cake are improved;
step three, dehumidification for three times: a second layer of material conveying mechanism of the middle layer of material conveying mechanism 2 is used for relaying and turning back to convey filter cakes; a small amount of hot air continuously enters the lower-layer material conveying mechanism 3 through the hot air channel, part of the hot air carries out third heat exchange with the filter cake in the second-layer material conveying mechanism, the contact surface of the hot air and the filter cake is expanded for the third time, and the dehumidification and drying effect and efficiency of the filter cake are further improved;
step four, dehumidification for four times: the lower layer material conveying mechanism 3 finally relays to return and convey the filter cake; part of hot gas and the filter cake in the first layer of material conveying mechanism carry out fourth heat exchange, the contact surface of the hot gas and the filter cake is expanded for the fourth time, and the heat exchange time is prolonged, so that the dehumidifying and drying effects and efficiency of the filter cake are further improved;
finally, moisture removal and discharging: hot air flow returns through the four-layer material conveying mechanism 1-3 through the hot air channel, the four layers of wet filter cakes are completely, uniformly and repeatedly heated, water in the wet filter cakes is evaporated into water vapor (heat exchange) when heated and is discharged from the air outlet 11, and meanwhile, the dust-proof bag prevents the hot air flow from escaping along with dust; and (3) dehumidifying the wet filter cake into a dry filter cake with the water content of 10-30% and outputting the dry filter cake from a discharge port 8 of the lower-layer material conveying mechanism 3.
The four-step dehumidification method of the filter cake provided by the invention has the beneficial effects that the four layers of spiral foldback material conveying type hot air flow-through dehumidifier are used: (1) By creating a four-layer spiral filter cake dehumidifier which is directly and vertically butted with a filter cake spiral output machine to replace a closed filter cake dryer, and reasonably omitting a filter cake transfer hoisting machine, the post-treatment process of a filter cake is optimized, main equipment is relatively integrated, and the occupied area is minimized; (2) By arranging the four layers of steel shaftless spiral material conveying mechanisms, the closed filter cake dryer double-layer mesh belt material conveying mechanisms are equivalently replaced, the service life of key parts is prolonged, and meanwhile, a sludge filter cake stirring and slitting mechanism and a filter cake stirring and slitting process are reasonably omitted, so that the structure and the process of drying equipment are simplified; (3) A high-temperature evaporation drying mode of a filter cake in a hot gas back-turn flow-through four-layer material conveying mechanism replaces a low-temperature condensation dehumidification mode, so that the energy consumption is minimized; the effect and efficiency of dehumidification and drying of the sludge filter cake are improved; the requirements of optimization of the process of large-scale modern sewage treatment engineering (easy winding sludge drying), unit integration, simplification of structure, longest service life, minimized energy consumption, minimized cost and maximized efficiency are met; represents the development trend of a sludge filter cake dehumidifier, and has remarkable technical effect.
Claims (3)
1. A four-layer spiral turn-back material conveying type hot gas flow-through dehumidifier comprises an upper layer material conveying mechanism, a middle layer material conveying mechanism, a lower layer material conveying mechanism, a laminated frame, a hot air blower and a dust bag; the method is characterized in that: the upper layer material conveying mechanism is a fourth layer closed dry type shaftless screw conveyor and comprises a driving motor, a U-shaped material conveying groove, a shaftless screw body, an angle steel type support, a material inlet, a material outlet, a hot air inlet and a material conveying groove cover plate; the U-shaped conveying chute is a U-shaped wear-resistant conveying chute, is 50mm higher than the U-shaped conveying chute of a common single-function screw conveyor and is used as a hot air channel; the arranged shaftless spiral body can prevent the sludge filter cake from winding and improve the conveying efficiency; the middle layer material transfer mechanism is a second layer closed dry shaftless screw conveyor and a third layer closed dry shaftless screw conveyor, the number of the hot air inlets is less than that of the upper layer material transfer mechanism, and the material inlet and the material outlet of the adjacent material transfer mechanisms are mutually corresponding; the lower layer material conveying mechanism is a first layer closed dry type shaftless screw conveyor, a left end air outlet is additionally arranged on the basis of the middle layer material conveying mechanism, and a feed inlet of the left end air outlet corresponds to a discharge outlet of the second material conveying mechanism; the laminated rack is shared by four layers of material conveying mechanisms and comprises a rack main body and an angle steel type support; the interconnection relationship is: because the four-layer spiral filter cake dehumidifier is higher, a horizontal assembly method is adopted for convenient assembly, the four-layer material conveying mechanisms are sequentially connected into a whole by utilizing a double-layer stacked type frame, the feed inlets and the discharge outlets of the adjacent material conveying mechanisms are accurately butted, and then the horizontal type is righted to be vertical, so that the four-layer spiral turn-back material conveying type hot gas flow-through dehumidifier main body is formed; when the assembly is carried out, the hot air blower and the dust bag are arranged at corresponding positions to form a four-layer spiral turn-back material conveying type hot air flow-through dehumidifier which has the function of hot air dehumidification and drying of a filter cake which is turned back and conveyed; the four layers of spiral turn-back material conveying type hot gas flow-through dehumidifiers are integrally arranged below the filter cake spiral output machine, a feed inlet of an upper layer material conveying mechanism is in butt joint with a discharge outlet of the filter cake spiral output machine, a hot air machine is communicated with a hot gas source, and driving motors of all layers are communicated with the hot air machine and a PLC program control system; the filter cake outward conveying equipment corresponds to a discharge hole of the lower layer material conveying mechanism; the wet filter cake with the water content of 30-50% can be dehumidified by inputting hot air with the temperature of 90 ℃ into a dry filter cake with the water content of 10-30%, and the dry filter cake is output to outward transportation equipment.
2. The four-layer spiral foldback hot air flow-through dehumidifier recited in claim 1, wherein: the laminated frame is characterized in that a frame main body arranged on the laminated frame is a frame main body and comprises three stand columns, two cross beams and two stable inclined ribs, the length of the laminated frame corresponds to that of each layer of material conveying mechanism, and the height of the laminated frame corresponds to the total height of four layers of material conveying mechanisms; four angle steel formula support alternate welding on the stand of frame main part, its interval and the individual layer pass the height of material mechanism corresponding, so form the range upon range of formula frame.
3. A four-step dehumidification method of filter cakes is characterized by comprising the following steps: the four-layer spiral-turn-back material conveying type hot gas percolation dehumidifier as claimed in claim 1 is used, under the control of a PLC program control system, the four-layer spiral-turn-back material conveying type hot gas percolation dehumidifier, the filter cake spiral output machine and a pulling plate cake unloading mechanism of a large-scale filter press intermittently and synchronously work, and the specific process flow of the filter cake four-step dehumidification method is as follows:
(1) Inputting a filter cake: a filter cake screw output machine horizontally inputs the wet filter cake with the water content of 30-50% into an upper layer material conveying mechanism;
(2) Dehumidifying a filter cake: the four-step dehumidification method for evaporating and drying the filter cake at high temperature is adopted while the four layers of spiral foldback material conveying type hot air flow-through dehumidifiers fold and return conveying wet filter cakes as follows:
step one, material receiving and air inlet: upper layer material conveying mechanism, namely fourth layer material conveying mechanism for receiving and conveying wet filter cake spiral output machine
A filter cake, namely, a shaftless spiral body stirs the massive filter cake to fully expose the water in gaps of the filter cake; meanwhile, the hot air blower inputs high-temperature hot air at 90 ℃ into the upper layer material conveying mechanism, most hot air flow enters the middle layer material conveying mechanism and the lower layer material conveying mechanism forwards through the hot air channel, and a small part of hot air exchanges heat with the filter cake in the upper layer material conveying mechanism for the first time;
step two, secondary dehumidification: a third layer of material conveying mechanism of the middle layer of material conveying mechanism returns back to transmit filter cakes in a relay manner; half hot air flow continuously enters a second layer material conveying mechanism and a lower layer material conveying mechanism of the middle layer material conveying mechanism forwards through a hot air channel, part of hot air and filter cakes in a third layer material conveying mechanism carry out secondary heat exchange, and the contact surface and the heat exchange time of the hot air and the filter cakes are expanded for the second time;
thirdly, dehumidification for the third time: a second layer of material conveying mechanism of the middle layer of material conveying mechanism returns back in relay to transmit filter cakes; a small amount of hot air continuously enters the lower-layer material conveying mechanism through the hot air channel, part of the hot air is subjected to third heat exchange with the filter cake in the second-layer material conveying mechanism, and the contact surface between the hot air and the filter cake is expanded for the third time;
step four, dehumidification for four times: the lower layer material conveying mechanism finally relays to turn back and convey the filter cake; part of hot gas and the filter cake in the first layer of material conveying mechanism carry out fourth heat exchange, the contact surface of the hot gas and the filter cake is expanded for the fourth time, and the heat exchange time is prolonged, so that the dehumidifying and drying effects and efficiency of the filter cake are further improved;
finally, moisture removal and discharge: hot air flow returns through the four-layer material conveying mechanism through the hot air channel, the four layers of wet filter cakes are comprehensively, uniformly and repeatedly heated, water in the wet filter cakes is evaporated into water vapor by heat and is discharged from the air outlet, and meanwhile, the dust-proof bag prevents the hot air flow from escaping along with dust; and (4) dehumidifying the wet filter cake into a dry filter cake with the water content of 10-30% and outputting the dry filter cake from a discharge port of the lower-layer material conveying mechanism.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211469718.6A CN115751923A (en) | 2022-11-23 | 2022-11-23 | Four-layer spiral turn-back material conveying type hot gas flow-through dehumidifier and four-step filter cake dehumidification method |
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| CN202211469718.6A CN115751923A (en) | 2022-11-23 | 2022-11-23 | Four-layer spiral turn-back material conveying type hot gas flow-through dehumidifier and four-step filter cake dehumidification method |
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| CN202211469718.6A Pending CN115751923A (en) | 2022-11-23 | 2022-11-23 | Four-layer spiral turn-back material conveying type hot gas flow-through dehumidifier and four-step filter cake dehumidification method |
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