CN107382016B - Low-temperature closed-loop sludge drying system - Google Patents
Low-temperature closed-loop sludge drying system Download PDFInfo
- Publication number
- CN107382016B CN107382016B CN201710776841.5A CN201710776841A CN107382016B CN 107382016 B CN107382016 B CN 107382016B CN 201710776841 A CN201710776841 A CN 201710776841A CN 107382016 B CN107382016 B CN 107382016B
- Authority
- CN
- China
- Prior art keywords
- heat exchanger
- air
- temperature
- drying
- drying box
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Drying Of Solid Materials (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a low-temperature closed-loop sludge drying system, which comprises a drying box and a circulating system, wherein the drying box is provided with a feed inlet (8) and a discharge outlet (20), and the drying box is respectively communicated with the circulating system through an air outlet (7) and a hot air inlet (24); the circulating system comprises a first heat exchanger (6), a second heat exchanger (4), a third heat exchanger (31), a fourth heat exchanger (28) and a fan (33), wherein one end of the first heat exchanger is communicated with the drying box through an air outlet (7), the other end of the first heat exchanger is communicated with the second heat exchanger through an air pipe, the second heat exchanger is communicated with the third heat exchanger through an air pipe, the other end of the third heat exchanger is communicated with the fourth heat exchanger through an air pipe, the other end of the fourth heat exchanger is communicated with the drying box through a hot air inlet, and the fan is arranged in the air pipe. The invention has low drying temperature, runs in a closed loop system, does not generate peculiar smell in the drying process, and has low water content and low energy consumption of the dried sludge.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a low-temperature closed-loop sludge drying system.
Background
Along with the expansion of sewage treatment scale and the improvement of standards, the sludge production is continuously increased, and together with the accumulated sludge, the treatment and disposal of the sludge become a great problem in the field of sewage treatment, and the drying treatment of the sludge is one step of the key.
In order to reduce pollution and avoid the generation of greenhouse gases, the sludge can be turned into wealth, and is subjected to drying treatment to become a fuel which can be utilized. The general sludge treatment process is drying and dewatering. The current sludge drying has the advantages that the sludge is dried through high-temperature flue gas, the dried tail gas also needs to be reprocessed, the temperature of the drying process is higher, the temperature is generally between 150 ℃ and 200 ℃, the generated taste is heavier during drying, toxic and harmful gas is easy to generate, and the whole system structure is complex. At present, electroosmosis is also adopted to dry and dehydrate sludge, but the electroosmosis also has the problems of high energy consumption, poor dehydration effect caused by overlarge sludge resistance when the water content of the sludge is low, easy loss of electrode plates and the like.
Disclosure of Invention
In view of the above, the invention provides a low-temperature closed-loop sludge drying system with low drying temperature, low water content of dried sludge and low energy consumption, which aims at the technical problems of high drying requirement temperature, easiness in generating toxic and harmful tail gas and poor drying effect in the prior art.
The technical scheme of the invention is that the low-temperature closed-loop sludge drying system with the following structure comprises a drying box and a circulating system, wherein the drying box is provided with a feed inlet and a discharge outlet, and the drying box is respectively communicated with the circulating system through an air outlet and a hot air inlet;
the circulating system comprises a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger and a fan, wherein one end of the first heat exchanger is communicated with the drying box through an air outlet, the other end of the first heat exchanger is communicated with the second heat exchanger through an air pipe, the second heat exchanger is communicated with the third heat exchanger through an air pipe, the other end of the third heat exchanger is communicated with the fourth heat exchanger through an air pipe, the other end of the fourth heat exchanger is communicated with the drying box through a hot air inlet, and the fan is arranged in the air pipe;
the coil pipe of the second heat exchanger is connected with the compressor, and two ends of the coil pipe of the first heat exchanger are respectively communicated with two ends of the third heat exchanger.
Optionally, the dry air enters the drying box from the hot air inlet, the hot air utilizes air convection to take away the moisture of the sludge, the moisture is changed into medium-temperature wet air in the drying box, the medium-temperature wet air is discharged from the air outlet and enters the first heat exchanger, the cold energy of the first heat exchanger is absorbed, the heat is transferred to the first heat exchanger, the temperature of the medium-temperature wet air is reduced to the dew point temperature of the medium-temperature wet air, partial moisture is separated out, the saturated air continuously enters the second heat exchanger, the temperature of the saturated air is further reduced, more moisture is separated out to become low-temperature saturated air, the low-temperature saturated air is heated to the medium-temperature through the third heat exchanger, then the temperature is increased to the high temperature through the fourth heat exchanger, and the high-temperature low-humidity air enters the drying box from the hot air inlet and circulates accordingly.
Optionally, the circulation system further comprises a fifth heat exchanger, the coil pipe of the second heat exchanger is further communicated with the coil pipe of the fifth heat exchanger, a throttling element is arranged on a connecting pipeline of the coil pipe of the second heat exchanger and the coil pipe of the fifth heat exchanger, and the fifth heat exchanger is communicated with the coil pipe of the fourth heat exchanger through a hot water channel.
Optionally, the drying cabinet includes drying cabinet body, material conveying guipure, guipure drive arrangement, baffle and hot-water line, conveying guipure top-down distribute and have the multilayer, the baffle set up in the below of every layer of conveying guipure correspondingly, by baffle will drying cabinet body top-down separates into 1 st, 2 nd, 3 rd.
Optionally, the fifth heat exchanger comprises a coil pipe and a shell, wherein the shell is filled with water, the coil pipe is positioned in water in the shell, and the shell of the fifth heat exchanger is communicated with a hot water pipeline in the drying box through a hot water pipeline.
Optionally, each layer of baffle divide into two in the width direction, all can realize the upset on every baffle, has seted up feed opening and gas vent in one side of baffle, and the feed opening and the gas vent of the baffle of upper and lower adjacent layer distribute in different sides.
Optionally, the drying cabinet still include the gear train who drives the baffle upset, gear train include driving motor, first straight gear, second straight gear, belt, pivot, first bevel gear and second bevel gear, driving motor be connected with first straight gear, first straight gear and second straight gear meshing, first straight gear drives the pivot rotation, is fixed with a plurality of second bevel gears in the pivot, the second straight gear passes through the belt and drives another pivot rotation, also is provided with a plurality of second bevel gears in another pivot, second bevel gear and first bevel gear one-to-one meshing, first bevel gear link to each other with the baffle in order to drive the baffle rotation.
Optionally, the hot air inlet install in the lower part of drying cabinet, the air outlet install in the upper portion of drying cabinet, first heat exchanger and second heat exchanger lower extreme be provided with the ponding dish, the fifth heat exchanger in be provided with the polylith baffle, the high temperature end of fifth heat exchanger, fourth heat exchanger and hot-water line are linked together through the pipeline, hot air inlet import department be provided with the deep bead.
Optionally, a plurality of combing devices for loosening and turning the sludge are arranged on each layer of baffle.
Optionally, a water pump is arranged on a connecting pipeline between the first heat exchanger and the third heat exchanger, and a water pump is also arranged on a connecting pipeline between the fifth heat exchanger and the hot water pipeline between the fourth heat exchanger and the drying box.
With the structure, the invention has the following advantages: the whole system is divided into three sub-circulation systems, namely an air circulation system, a hot water circulation system and a refrigerant circulation system. The first heat exchanger exchanges cold and heat with the third heat exchanger, the second heat exchanger exchanges cold and heat with the fifth heat exchanger, the fourth heat exchanger exchanges cold and heat with the fifth heat exchanger, the cold and heat are utilized to the maximum extent, meanwhile, the drying medium is dehumidified and heated in the system, no tail gas is discharged, and a closed-loop drying system is formed. The invention utilizes the heat pump principle, and the heat pump has a COP value, namely consumes one degree of electric energy, can generate several times of heat energy, and has low energy consumption. The invention has low drying temperature, and the whole air runs in a closed loop system, so that no peculiar smell is generated in the drying process, the water content of the dried sludge is low, and the energy consumption is low.
Drawings
FIG. 1 is a schematic diagram of a low-temperature closed-loop sludge drying system;
FIG. 2 is an isometric view of a low temperature closed loop sludge drying system of the present invention;
FIG. 3 is a cross-sectional view of the low temperature closed loop sludge drying system of the present invention;
fig. 4 is a right side view of the low temperature closed loop sludge drying system of the present invention.
As shown, 1, compressor, 2, throttling element, 3, ii-v line, 4, second heat exchanger, 5, air duct, 6, first heat exchanger, 7, air outlet, 8, material inlet, 9, conveying mesh belt, 10, drying box, 11, feed opening, 12, exhaust opening, 13, baffle, 14, first straight gear, 15, first bevel gear, 16, second bevel gear, 17, spindle, 18, mesh belt driving device, 19, hot water line, 20, discharge opening, 21, comb, 22, wind deflector, 23, connecting line, 24, hot air inlet, 25, flowmeter, 26, water outlet pipe, 27, three-way valve, 28, fourth heat exchanger, 29, temperature and humidity sensor, 30, i-iii line, 31, third heat exchanger, 32, water pump, 33, fan, 34, controller, 35, baffle, 36, fifth heat exchanger, 37, water accumulation tray, 38, second bevel gear, 39, belt, 40, driving motor.
Detailed Description
The invention will be further described with reference to the drawings and the specific examples.
The invention is intended to cover any alternatives, modifications, equivalents, and variations that fall within the spirit and scope of the invention. In the following description of preferred embodiments of the invention, specific details are set forth in order to provide a thorough understanding of the invention, and the invention will be fully understood to those skilled in the art without such details. Furthermore, the drawings of the present invention are not necessarily to scale, nor are they necessarily drawn to scale.
As shown in fig. 1 and 2, the low-temperature closed-loop sludge drying system provided by the invention comprises a drying box and a circulating system, wherein the drying box is provided with a feed inlet 8 and a discharge outlet 20, the circulating system comprises a plurality of heat exchangers and a fan 33, the fan 33 can adopt a variable-frequency fan, and the air quantity is adjustable.
The circulating system comprises a first heat exchanger 6, a second heat exchanger (serving as an evaporator) 4, a third heat exchanger 31, a fourth heat exchanger 8 and a fifth heat exchanger (serving as a condenser) 36, wherein the first heat exchanger, the second heat exchanger (serving as the evaporator), the third heat exchanger and the fourth heat exchanger are all coil pipe fin type heat exchangers, a plurality of fins are arranged in the heat exchangers, the fins are made of aluminum materials, the coils are copper pipes with good heat conduction performance, and the area of the heat exchange fins is determined according to the heat exchange quantity. The fifth heat exchanger is also a coiled baffle heat exchanger, the first heat exchanger 6 is connected with the drying box body through an air outlet 7, the other end of the first heat exchanger is connected with the second heat exchanger 4 through an air pipe 5, the first heat exchanger 6 is also connected with the third heat exchanger 31 through an I-III pipeline 30, the second heat exchanger 4 is connected with the third heat exchanger 31 through an air pipe 5, the second heat exchanger 4 is connected with the fifth heat exchanger 36 through an II-V pipeline 3, a fan 33 is further arranged between the second heat exchanger 4 and the third heat exchanger 31, one end of the fourth heat exchanger 28 is connected with the third heat exchanger 31 through an air pipe, the other end of the fourth heat exchanger is connected with the drying box body through a hot air inlet 24, the fourth heat exchanger is also connected with the fifth heat exchanger 36 and a water pipe 19 in the drying box through a connecting pipeline 23, the II-V pipeline 3 is filled with refrigerant freon, the I-III pipeline 30 is filled with water, and a water pump 32 is further arranged between the I-III pipeline.
The drying box comprises a drying box body 10, a material conveying net belt 9, net belt driving devices 18, baffles 13 and hot water pipelines 19, wherein the drying box body is of a cuboid structure, the baffles 13 are fixedly arranged on the drying box body 10, each baffle 13 and the drying box body 10 form a relatively closed space, the conveying net belt 9 is arranged in the relatively closed space formed by the baffles 13 and the drying box body, multiple layers of net belts 9 are distributed from top to bottom, the mesh size is gradually reduced from the upper layer to the lower layer, the layers are determined according to the drying speed and the water content, the sludge water content is required to be lower, the more distributed layers are the net belt 9 is made of a metal material with good heat conducting performance, the baffles 13 and the net belt 9 are in one-to-one correspondence, each net belt 9 is provided with one baffle, the baffles 13 and the net belt 9 form a sub-drying area from top to bottom, the N drying area is staggered in a certain direction, when the material moves from left to right, the next net belt is arranged on the right side of the net belt to the net belt, the net belt is more than the upper net belt, the net belt is in a right side of the net belt 9, the net belt is in direct contact with the hot water pipelines, and the heat can be directly driven by the net belt 18, and the heat can be directly driven by the net belt driving devices 18.
The baffle 13 is divided into two in the width direction, each baffle is connected with a first bevel gear 15, a feed opening 11 and an exhaust opening 12 are formed in one end, close to the drying oven, of each baffle, the feed opening is arranged right below the conveying mesh belt 9, the exhaust opening 12 is arranged at the outer end of the feed opening 11 and is used for drying air flow, the feed opening 11 and the exhaust opening 12 of the next baffle 13 are formed in the other end of the drying oven, so that materials, drying air and hot water all travel in an S-shaped route in the drying oven, and the materials are in inverse contact with the drying air and the hot water. Each baffle 13 is provided with a plurality of comb units 21 for loosening and turning the sludge, so as to enhance the heat and mass transfer between the sludge and the dry air and hot water.
The drying cabinet still includes the gear drive mechanism that the drive baffle overturned, and this gear drive mechanism includes driving motor 40, first straight-line gear 14, second straight-line gear 38, belt 39, pivot 17, first bevel gear 15, second bevel gear 16, driving motor 40 is connected with first straight-line gear 14, first straight-line gear 14 and second straight-line gear 35 meshing, first straight-line gear 14 drives pivot 17 rotation, is fixed with a plurality of second bevel gears 16 on the pivot 17, and second straight-line gear 38 passes through belt 39 and drives another pivot 17 rotation, also is provided with a plurality of second bevel gears 16 on another pivot 17, second bevel gears 16 and first bevel gear 15 one-to-one meshing, first bevel gear 15 links to each other with baffle 13, gear drive mechanism install outside drying cabinet 10. In order to form a plurality of drying subchambers, the baffle is arranged, and the net belt is provided with a mesh structure, so that the small-size sludge of fine particles easily passes through the net belt and falls onto the baffle, and the baffle adopts a turnover structure to turn down the sludge falling and collected on the baffle.
The hot air inlet 24 is arranged at the lower end of the drying box 10 and corresponds to the Nth sub-drying area, the wind guard 22 is arranged at the inlet of the hot air inlet 24, hot air can not be directly discharged from the discharge hole 22 through the wind guard 22, the air outlet 7 is arranged at the upper part of the drying box and corresponds to the first drying area, the water accumulation tray 37 is arranged at the lower ends of the first heat exchanger 6 and the second heat exchanger 4, a plurality of baffle plates 32 are arranged in the fifth heat exchanger, and the connecting pipeline 23 is respectively connected with the high-temperature end of the fifth heat exchanger 36, the fourth heat exchanger 28 and the in-box hot water pipeline 19.
The gas circulation line is hot air inlet 24- & gt N sub-drying area- & gt N-1 sub-drying area- & gt 2 sub-drying area- & gt 1 sub-drying area- & gt air outlet 7- & gt first heat exchanger 6- & gt second heat exchanger 4- & gt blower 33- & gt third heat exchanger 31- & gt fourth heat exchanger 28- & gt hot air inlet 24, the gas is heated by convection and conduction during drying due to the fact that the gas passes through a plurality of drying areas, the double effect is achieved, the air at the outlet is saturated wet air or nearly saturated wet air, a large amount of water can be separated out after the temperature of the first heat exchanger and the second heat exchanger is reduced, the hot water circulation line is the hot end of the fifth heat exchanger 36- & gt water pump 32- & gt three-way valve 27- & gt connecting pipeline 23 and the coil of the fourth heat exchanger- & gt hot end of the tank of the N-1 sub-drying area is the hot water pipe 19 of the N-1 sub-drying area,. Hot water pipe 19 of the 2 sub-drying area- & gt hot water pipe 19 of the fourth heat exchanger- & gt 2 sub-drying area is the coil of the fourth heat exchanger and the cold end of the fifth heat exchanger 36 is the fifth heat exchanger 36, and the hot end of the fifth heat exchanger is the fifth heat exchanger 1 is the expansion valve of the fifth heat exchanger 1.
The temperature of the air is 75-85 ℃, the temperature of hot water is 80-90 ℃, the temperature of outlet air is low-temperature saturated air, the temperature is 40-50 ℃, the moisture content of saturated air per cubic air at 45 ℃ is 65.5g, the temperature of the air is reduced to 30-40 ℃ after passing through a first heat exchanger 6, the moisture content of saturated air per cubic air at 35 ℃ is 39.7g, the moisture removal amount of saturated air per cubic air is 25.8g after passing through the first heat exchanger, the temperature of an evaporator is 10-15 ℃, the temperature of saturated air per cubic air is reduced to 15-20 ℃ after passing through a second heat exchanger 4, the moisture removal amount of saturated air per cubic air is 17.3g after passing through the second heat exchanger is 22.4g, the total moisture removal amount is 48.2g, the moisture removal amount is 74%, and the more the temperature is reduced, the moisture removal amount is larger. The temperature rises to 35-40 deg.c after passing through the third heat exchanger 31 and to 75-85 deg.c after passing through the fourth heat exchanger 28, at which time the air humidity is 5.9%, essentially dry air, which ensures that sufficient moisture is carried out.
The sludge drying system further comprises a plurality of temperature and humidity sensors 29, a flowmeter 25 and a controller 34, wherein the temperature and humidity sensors 29 are arranged in the hot air inlet 24, the air outlet 7, the inlet and outlet of each heat exchanger and the bellows, and the controller 34 is connected with the temperature and humidity sensors 29, the flowmeter 25, the fan 33, the water pump 32, the compressor 1, the throttling element 2 and the like and is used for realizing automatic control of the system. The saturation humidity of the air can be detected in real time through the installed temperature and humidity sensor, the air humidity of the outlet is ensured to be in a saturated state or close to the saturated state, and if the air humidity does not reach the saturated state, the air quantity, the air speed, the rotating speed of the net belt, the opening degree of the throttling element, the pressure of the compressor and the like of the fan are adjusted, so that the whole system is kept in an optimal state.
The working principle of the system is as follows: the sludge enters the uppermost layer of the mesh belt from the material inlet, the mesh belt drives the sludge to slowly move from left to right under the action of the mesh belt driving device, when the sludge moves to the right end, the sludge falls to the rightmost end of the second layer of mesh belt from the discharging hole, the second layer of mesh belt slowly moves from right to left under the action of the mesh belt driving device, the mesh belt and the sludge are driven to slowly move from right to left, when the sludge moves to the leftmost end, the sludge falls to the third layer of mesh belt from the discharging hole, and the sludge moves from left to right until the sludge falls to the last layer of mesh belt to be discharged from the material outlet. In the sludge movement process, dry air enters a drying box from a hot air inlet, hot water also enters the drying box from a hot water pipeline to an Nth sub-drying area, the hot water pipeline transfers heat of water to sludge to heat the sludge, meanwhile, the dry hot air contacts the sludge, the hot air enters an N-1 sub-drying area from an exhaust port of the Nth drying area, the hot water also enters the N-1 sub-drying area from a hot water pipeline in the box to continuously heat the sludge, moisture of the sludge is taken away, and so on, the hot water enters the 1 st sub-drying area, the temperature of the hot water is reduced to medium temperature water (40-50 ℃), the air is also changed to medium temperature saturated humid air (the temperature is 40-50 ℃), the saturation temperature is 90% -100%), the air is discharged from an air outlet and enters a first heat exchanger to absorb the cold energy of the first heat exchanger, the heat is transferred to the first heat exchanger, the saturated humid air temperature is reduced to 30-40 ℃ below the dew point temperature, part of the saturated air is continuously enters a second heat exchanger to be further reduced to 15-20 ℃, more moisture is separated out to be low-temperature and air, then enters a third heat exchanger (the third heat exchanger is increased to the temperature is higher than the fourth heat exchanger from the fourth heat exchanger to the fifth heat exchanger) to the fifth heat exchanger, and the temperature is increased from the fourth heat exchanger to the fourth heat exchanger is increased to the fourth heat exchanger to the heat the fourth heat exchanger is subjected to the heat exchanger is from the fifth heat exchanger to the heat exchanger is heated to the heat the fourth heat exchanger is subjected to the heat temperature is 75 heat the heat temperature after the temperature is heated to the temperature is entering the temperature is heated to the temperature is heated. Part of the hot water from the fifth heat exchanger directly enters a hot water pipeline in the drying box, the other part of the hot water enters the fourth heat exchanger, heat is transferred to air passing through the fourth heat exchanger to heat the hot water, the hot water reversely runs with sludge from the lower layer to the upper layer in the drying box according to an S-shaped route, is discharged to the cold end of the fifth heat exchanger from a water outlet pipe, exchanges heat with the fifth heat exchanger, and then turns into hot water with the temperature of 80-90 ℃ and then reenters the drying box. The refrigerant freon circulation route is compressor- & gt the hot end of the fifth heat exchanger- & gt the cold end of the fifth heat exchanger- & gt the expansion valve- & gt the second heat exchanger- & gt the compressor.
The whole system is divided into three sub-circulation systems, namely a dry air circulation system, a hot water circulation system and a refrigerant Freon circulation system. The first heat exchanger exchanges cold and heat with the third heat exchanger, the second heat exchanger exchanges cold and heat with the fifth heat exchanger, the fourth heat exchanger exchanges cold and heat with the fifth heat exchanger, the cold and heat are utilized to the maximum extent, meanwhile, the drying medium is dehumidified and heated in the system, no tail gas is discharged, and a closed-loop drying system is formed. Compared with the prior art, the low-temperature closed-loop sludge drying system has the advantages that the drying temperature is relatively low, so that the low-temperature closed-loop sludge drying system is called as low temperature, and the technical problem to be solved by the invention is embodied.
Although the embodiments have been described and illustrated separately above, and with respect to a partially common technique, it will be apparent to those skilled in the art that alternate and integration may be made between embodiments, with reference to one embodiment not explicitly described, and reference may be made to another embodiment described.
The foregoing is illustrative of the preferred embodiments of the present invention, and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. In general, all changes that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (4)
1. The utility model provides a low temperature closed loop sludge drying system, includes drying cabinet and circulation system, its characterized in that: the drying box is provided with a feed inlet (8) and a discharge outlet (20), and the drying box is respectively communicated with the circulating system through an air outlet (7) and a hot air inlet (24);
the circulating system comprises a first heat exchanger (6), a second heat exchanger (4), a third heat exchanger (31), a fourth heat exchanger (28) and a fan (33), wherein one end of the first heat exchanger (6) is communicated with the drying box through an air outlet (7), the other end of the first heat exchanger is communicated with the second heat exchanger (4) through an air pipe, the second heat exchanger (4) is communicated with the third heat exchanger (31) through an air pipe, the other end of the third heat exchanger (31) is communicated with the fourth heat exchanger (28) through an air pipe, the other end of the fourth heat exchanger (28) is communicated with the drying box through a hot air inlet (24), and the fan (33) is arranged in the air pipe;
the coil pipe of the second heat exchanger (4) is connected with the compressor (1), and two ends of the coil pipe of the first heat exchanger (6) are respectively communicated with two ends of the third heat exchanger (31);
the dry air enters a drying box from a hot air inlet (24), hot air utilizes air convection to take away the moisture of sludge, the moisture is changed into medium-temperature wet air in the drying box, the medium-temperature wet air is discharged from an air outlet (7) and enters a first heat exchanger (6), the cold energy of the first heat exchanger (6) is absorbed, the heat is transferred to the first heat exchanger (6), the temperature of the medium-temperature wet air is reduced to the dew point temperature of the medium-temperature wet air, partial moisture is separated, the saturated air continues to enter a second heat exchanger (4), the temperature of the saturated air is further reduced, more moisture is separated and becomes low-temperature saturated air, the low-temperature saturated air is heated to the medium-temperature through a third heat exchanger (31), then the temperature is increased to the high temperature through a fourth heat exchanger (28), and the high-temperature low-humidity air enters the drying box from the hot air inlet (24) and circulates accordingly;
the circulating system further comprises a fifth heat exchanger (36), the coil pipe of the second heat exchanger (4) is also communicated with the coil pipe of the fifth heat exchanger (36), a throttling element (2) is arranged on a connecting pipeline of the coil pipe and the fifth heat exchanger, and the fifth heat exchanger (36) is communicated with the coil pipe of the fourth heat exchanger (28) through a hot water channel;
the drying box comprises a drying box body (10), conveying mesh belts (9), mesh belt driving devices (18), baffles (13) and hot water pipelines (19), wherein multiple layers of conveying mesh belts (9) are distributed from top to bottom, the baffles (13) are correspondingly arranged below each layer of conveying mesh belts (9), the drying box body (10) is divided into a 1 st drying area, a 2 nd drying area and a 3 rd drying area from top to bottom by the baffles (13), and the conveying mesh belts (9) are in contact with the hot water pipelines (19) so that heat of hot water can be directly conducted onto the conveying mesh belts (9);
the drying oven also comprises a gear transmission mechanism for driving the baffle plate to turn over, the gear transmission mechanism comprises a driving motor (40), a first straight gear (14), a second straight gear (38), a belt (39), a rotating shaft (17), a first bevel gear (15) and a second bevel gear (16), the driving motor (40) is connected with the first straight gear (14), the first straight gear (14) is meshed with the second straight gear (38), the first straight gear (14) drives the rotating shaft (17) to rotate, a plurality of second bevel gears (16) are fixed on the rotating shaft (17), the second straight gear (38) drives the other rotating shaft (17) to rotate through the belt (39), a plurality of second bevel gears (16) are also arranged on the other rotating shaft (17), the second bevel gears (16) are meshed with the first bevel gears (15) one by one, and the first bevel gears (15) are connected with the baffle plate (13) to drive the baffle plate to rotate;
the fifth heat exchanger (36) comprises a coil pipe and a shell, a water body is filled in the shell, the coil pipe is positioned in the water in the shell, and the shell of the fifth heat exchanger (36) is communicated with a hot water pipeline in the drying box through a hot water pipeline;
each layer of baffle (13) is provided with a plurality of comb units (21) for loosening and turning sludge.
2. The low temperature closed loop sludge drying system of claim 1, wherein: each layer of baffle (13) divide into two in the width direction, can realize the upset on every baffle (13), has seted up feed opening (11) and gas vent (12) in one side of baffle (13), and feed opening (11) and gas vent (12) of the baffle of upper and lower adjacent layer distribute in different sides.
3. The low temperature closed loop sludge drying system of claim 1, wherein: the hot air inlet (24) is arranged at the lower part of the drying box body (10), the air outlet (7) is arranged at the upper part of the drying box body (10), a water accumulation disc is arranged at the lower ends of the first heat exchanger (6) and the second heat exchanger (4), a plurality of baffle plates (35) are arranged in the fifth heat exchanger (36), the high-temperature end of the fifth heat exchanger (36), the fourth heat exchanger (28) and the hot water pipeline (19) are communicated through pipelines, and a wind shield (22) is arranged at the inlet of the hot air inlet (24).
4. The low temperature closed loop sludge drying system of claim 2, wherein: a water pump (32) is arranged on a connecting pipeline between the first heat exchanger (6) and the third heat exchanger (31), and a water pump (32) is also arranged on a connecting pipeline between the fifth heat exchanger (36) and the fourth heat exchanger (28) and a hot water pipeline (19) of the drying box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710776841.5A CN107382016B (en) | 2017-09-01 | 2017-09-01 | Low-temperature closed-loop sludge drying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710776841.5A CN107382016B (en) | 2017-09-01 | 2017-09-01 | Low-temperature closed-loop sludge drying system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107382016A CN107382016A (en) | 2017-11-24 |
| CN107382016B true CN107382016B (en) | 2023-08-18 |
Family
ID=60348230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710776841.5A Active CN107382016B (en) | 2017-09-01 | 2017-09-01 | Low-temperature closed-loop sludge drying system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107382016B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110395873B (en) * | 2019-07-23 | 2021-12-24 | 华北水利水电大学 | Van-type vacuum drying device for urban sludge |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102923929A (en) * | 2012-12-03 | 2013-02-13 | 湖北国新天汇能源有限公司 | Method and device for drying sludge through solar energy |
| KR101338369B1 (en) * | 2013-11-08 | 2013-12-06 | 배희동 | Equipment and method for renewable energy production process by continuous air circulation drying process without emission |
| CN103992019A (en) * | 2014-06-04 | 2014-08-20 | 宋雷震 | System for drying sludge by virtue of diversified heat energy |
| CN203866171U (en) * | 2014-06-04 | 2014-10-08 | 宋雷震 | System for drying sludge by using diversified heat energy |
| EP2788701A1 (en) * | 2011-12-09 | 2014-10-15 | TSP GmbH | Process for drying sludge |
| CN104098241A (en) * | 2014-08-04 | 2014-10-15 | 饶宾期 | Sewage sludge advanced treatment device |
| CN104129896A (en) * | 2014-07-25 | 2014-11-05 | 华南理工大学 | Heat-pump drying device of sludge |
| CN204550367U (en) * | 2015-03-24 | 2015-08-12 | 北京石油化工学院 | Solar-assisted heat pump sludge drying system |
| KR20160121731A (en) * | 2015-04-10 | 2016-10-20 | 김부열 | Consecutive dry system for sludge having contained purification function of pollutant |
| CN106045275A (en) * | 2016-07-21 | 2016-10-26 | 黄志荣 | Sludge drying system |
| CN106380056A (en) * | 2016-08-18 | 2017-02-08 | 郭凯 | A municipal sludge deep drying device |
| CN106630539A (en) * | 2017-01-18 | 2017-05-10 | 成都天润泽环保科技有限公司 | Low-temperature drying device for sludge |
| CN107076513A (en) * | 2014-08-08 | 2017-08-18 | 苏伊士国际公司 | The heated drying method and apparatus of pasty product |
-
2017
- 2017-09-01 CN CN201710776841.5A patent/CN107382016B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2788701A1 (en) * | 2011-12-09 | 2014-10-15 | TSP GmbH | Process for drying sludge |
| CN102923929A (en) * | 2012-12-03 | 2013-02-13 | 湖北国新天汇能源有限公司 | Method and device for drying sludge through solar energy |
| KR101338369B1 (en) * | 2013-11-08 | 2013-12-06 | 배희동 | Equipment and method for renewable energy production process by continuous air circulation drying process without emission |
| CN103992019A (en) * | 2014-06-04 | 2014-08-20 | 宋雷震 | System for drying sludge by virtue of diversified heat energy |
| CN203866171U (en) * | 2014-06-04 | 2014-10-08 | 宋雷震 | System for drying sludge by using diversified heat energy |
| CN104129896A (en) * | 2014-07-25 | 2014-11-05 | 华南理工大学 | Heat-pump drying device of sludge |
| CN104098241A (en) * | 2014-08-04 | 2014-10-15 | 饶宾期 | Sewage sludge advanced treatment device |
| CN107076513A (en) * | 2014-08-08 | 2017-08-18 | 苏伊士国际公司 | The heated drying method and apparatus of pasty product |
| CN204550367U (en) * | 2015-03-24 | 2015-08-12 | 北京石油化工学院 | Solar-assisted heat pump sludge drying system |
| KR20160121731A (en) * | 2015-04-10 | 2016-10-20 | 김부열 | Consecutive dry system for sludge having contained purification function of pollutant |
| CN106045275A (en) * | 2016-07-21 | 2016-10-26 | 黄志荣 | Sludge drying system |
| CN106380056A (en) * | 2016-08-18 | 2017-02-08 | 郭凯 | A municipal sludge deep drying device |
| CN106630539A (en) * | 2017-01-18 | 2017-05-10 | 成都天润泽环保科技有限公司 | Low-temperature drying device for sludge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107382016A (en) | 2017-11-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201919594U (en) | Multistage direct-flow tempering heat pump drying device | |
| US9702572B2 (en) | Solar dehumidifying and cooling system | |
| CN204907720U (en) | Grain drier | |
| CN105104522A (en) | Cereal drying machine | |
| CN103423978B (en) | Heat pump drying device for water on surface of material | |
| CN202630632U (en) | Air dehumidifying and heating device | |
| CN106091181B (en) | High-efficiency dehumidification system | |
| US20170067657A1 (en) | Integrated Dehumidification Method and System Combining Boundary Layer Control with Mainstream Disturbance Enhanced Heat Exchange | |
| CN203011097U (en) | A heat pump dehumidification drying device | |
| CN107382016B (en) | Low-temperature closed-loop sludge drying system | |
| CN107344809B (en) | Air, hot water and refrigerant cooperative circulation sludge drying system | |
| CN204811761U (en) | Open multistage heat pump drying equipment of closed circulation | |
| CN209042989U (en) | A kind of viscosity object drying unit | |
| CN203605664U (en) | Heat pump drying device for removing water on surface of material | |
| CN104128074B (en) | A kind of compressed air drying adsorption system | |
| CN107311428B (en) | Low-temperature closed-loop sludge drying method | |
| CN106172735A (en) | A kind of open and close type cycle multistage heat pump drying equipment | |
| CN104501466A (en) | Thermal regeneration solution dehumidifying unit of ground source heat pump | |
| CN208566926U (en) | A kind of semiconductor refrigerating dehumidizer | |
| CN207699432U (en) | A kind of air, hot water and refrigerant cooperate with circulating sludge anhydration system | |
| CN204987795U (en) | Dry dehydrating unit | |
| CN104534591B (en) | A kind of double low-temperature receiver solution dehumidification units of heat-pump-type | |
| CN110015832A (en) | A kind of sludge drying system based on heat pump techniques | |
| CN204513968U (en) | Plate dryer | |
| CN104456769B (en) | The tower heating power actified solution dehumidifying unit of one kind cooling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |