CN115231799A - Sludge drying device - Google Patents
Sludge drying device Download PDFInfo
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- CN115231799A CN115231799A CN202210858347.4A CN202210858347A CN115231799A CN 115231799 A CN115231799 A CN 115231799A CN 202210858347 A CN202210858347 A CN 202210858347A CN 115231799 A CN115231799 A CN 115231799A
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- gas
- heat exchange
- sludge
- conveying
- air
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- 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
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
Abstract
The present disclosure relates to a sludge drying device, comprising: the device comprises a first heat exchange device, a heating unit and a conveying mesh belt. The first air inlet of the first heat exchange device is suitable for introducing external air. The air inlet end of the heating unit is communicated with the first air outlet of the first heat exchange device, and the heating unit is provided with a heat storage device. The conveying mesh belt is provided with a first gas distribution device and a first gas collection device and is suitable for conveying sludge to be treated. And the air inlet end of the first air distribution device is communicated with the air outlet end of the heating device and is used for blowing the heated air to the sludge to be treated on the conveying belt. The heating unit can be stored the generated heat quantity in the valley electricity period through setting up the heat-retaining device, and the peak electricity period stops the electricity and changes heat, utilizes the heat energy of deposit to heat the fresh air through the heating and the steam after the condensation dehumidification, the effectual running cost that has reduceed.
Description
Technical Field
The disclosure relates to the technical field of sludge treatment, in particular to a sludge drying device.
Background
In the process of treating sewage, sludge is generated in municipal sewage treatment plants, industrial sewage treatment plants, bottom sludge of wastewater ponds (tanks) and various industries such as chemical industry, medicine, refining, papermaking and the like, and the common sludge treatment method comprises the following steps: concentration, digestion, dehydration, drying, incineration, solidification and comprehensive utilization. In addition, a final disposal method for sanitary landfill of the landfill site is also provided. Among these, dehydration is currently the main treatment method in wide application.
Current mummification sludge dewatering device utilizes the electric energy to produce heat mostly, evaporates through heated air to the higher mud of water content and realizes the dehydration, but, the peak electricity period charges of electricity are higher when using the electric wire netting to carry out the electricity and change heat, greatly increased running cost.
Disclosure of Invention
In view of this, the present disclosure provides a sludge drying device, which can store the generated heat during the off-peak period, stop the power-to-heat during the peak period, and dry the sludge by using the stored heat energy, thereby effectively reducing the operation cost.
According to an aspect of the present disclosure, there is provided a sludge drying apparatus including:
the system comprises a first heat exchange device, a heating unit and a conveying mesh belt;
the first heat exchange device is provided with a first air inlet, a first exhaust gas inlet and a first air outlet, and the first air inlet is suitable for introducing external air;
the air inlet end of the heating unit is communicated with the first air outlet of the first heat exchange device, and the heating unit is provided with a heat storage device;
the conveying mesh belt is provided with a first gas distribution device and a first gas collection device and is suitable for conveying sludge to be treated;
the gas collecting end of the first gas collecting device faces the side, away from the sludge conveying side, of the conveying net belt, the gas outlet end of the first gas distributing device faces the side, away from the sludge conveying side, of the conveying net belt, the first gas distributing device and the first gas collecting device are arranged oppositely, and the gas inlet end of the first gas distributing device is communicated with the gas outlet end of the heating device;
the first gas collecting device is communicated with the first gas inlet and exhaust port of the first heat exchange device.
In a possible implementation manner, the heat exchanger further comprises a second heat exchange device and a third heat exchange device;
the conveying mesh belt is also provided with a second gas distribution device and a second gas collection device, the gas collection end of the second gas collection device faces one side of the conveying mesh belt for conveying the sludge, the gas outlet end of the second gas distribution device faces one side of the conveying mesh belt away from the side for conveying the sludge, and the second gas distribution device and the second gas collection device are arranged oppositely;
the first gas collecting device is communicated with the first waste gas inlet and outlet of the first heat exchange device through the third heat exchange device;
the second heat exchange device is provided with a second air inlet, a second exhaust gas inlet and a second air outlet, and the second air inlet is suitable for introducing external air;
the second gas outlet is communicated with the second gas distribution device through the third heat exchange device, and the second waste gas inlet is communicated with the second gas collecting device.
In one possible implementation, the heating unit is provided with a heat exchange chamber, a circulating air duct, a heat exchange pipeline and a hot air blower;
the heat exchange chamber, the circulating air duct and the air heater are sequentially communicated in a head position;
the heat exchange pipeline penetrates through the heat exchange chamber, and two ends of the heat exchange pipeline are respectively communicated with the first air outlet and the first air distribution device.
In a possible implementation manner, the heating unit is further provided with a heat storage chamber;
the heat storage device comprises a heat storage brick and a heating device;
the hot air blower is communicated with the heat exchange chamber through the heat storage chamber;
the heat storage brick is arranged inside the cavity of the heat storage chamber and is provided with a mounting hole;
the heating device is arranged in the cavity of the mounting hole.
In one possible implementation manner, the number of the heat storage bricks is more than two;
more than two heat storage bricks are stacked inside the cavity of the heat storage chamber.
In a possible implementation manner, the heat storage brick is also provided with a ventilation groove, a clamping groove and a positioning part;
the mounting holes penetrate through the two opposite side surfaces of the heat storage brick;
the ventilation groove and the clamping groove are respectively positioned on two opposite side surfaces of the side of the heat storage brick where the mounting hole is formed, the ventilation groove is matched with the clamping groove, and the ventilation groove is suitable for enabling air to flow through the heat storage brick;
the positioning parts are two and matched with each other, and the two positioning parts are respectively positioned on two opposite side surfaces of the heat storage brick, which are provided with the mounting holes.
In a possible implementation mode, the conveying mesh belt is also provided with a sludge distributor;
the first gas distribution device and the second gas distribution device are respectively close to two ends of the conveying net belt in the conveying direction, and the conveying net belt is suitable for conveying the sludge to be treated from one end close to the first gas distribution device to one end close to the second gas distribution device;
the sludge distributing machine is positioned on one side of the first gas distribution device, which deviates from the second gas distribution device, and the discharge port of the sludge distributing machine faces towards the conveying of the conveying mesh belt on one side of the sludge to be treated.
In a possible implementation manner, the conveying mesh belt is further provided with a shaping unit;
the shaping unit is arranged between the first gas collecting device and the second gas collecting device, the shaping unit is positioned on one side of the conveying net belt for conveying the sludge to be treated, and the shaping unit is suitable for crushing the sludge to be treated.
In a possible realization, the conveying mesh belt is also provided with a micro negative pressure box;
the conveying net belt penetrates through the micro negative pressure box, and the second gas collecting device and the second gas distributing device are both located inside a cavity of the micro negative pressure box.
In a possible implementation manner, the system further comprises a tail gas treatment unit;
the first heat exchange device is also provided with a first waste gas outlet, and the second heat exchange device is also provided with a second waste gas outlet;
the first exhaust gas outlet is respectively communicated with the gas inlet end of the heating unit and the tail gas treatment unit, and the first exhaust gas outlet is suitable for discharging the exhaust gas subjected to heat exchange in the first heat exchange device;
the second waste gas outlet is respectively communicated with the third heat exchange device and the tail gas treatment unit, and the second waste gas outlet is suitable for discharging waste gas which completes heat exchange in the second heat exchange device.
The present disclosure is applicable to sludge drying. The sludge to be treated is conveyed through the conveying mesh belt, and the first gas distribution device positioned on one side of the conveying mesh belt, which is far away from the side for conveying the sludge to be treated, emits high-temperature gas to evaporate and dry the sludge to be treated. The water on the excrement surface of the sludge to be treated is quickly evaporated into the air by the high-temperature gas, and the first gas collecting device is used for collecting steam generated by heating the sludge to be treated by the first gas distributing device. The first gas collecting device leads the collected saturated steam into the first heat exchange device to heat the fresh air supplemented by the first heat exchange device, and condenses and dehumidifies the steam collected by the first gas collecting device to form dry air with lower temperature. The heating unit can be stored the generated heat quantity in the valley electricity period through setting up the heat-retaining device, and the peak electricity period stops the electricity and changes heat, utilizes the heat energy of deposit to heat the fresh air through the heating and the steam after the condensation dehumidification, the effectual running cost that has reduceed.
Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a main structure diagram of a sludge drying apparatus according to an embodiment of the present disclosure;
FIG. 2 illustrates an industrial flow diagram of a sludge drying apparatus of an embodiment of the present disclosure;
FIG. 3 shows a main body structure view of a heating unit of an embodiment of the present disclosure;
fig. 4 shows a front view of a heat storage brick of an embodiment of the present disclosure;
fig. 5 shows a left side view of a heat storage brick of an embodiment of the present disclosure;
FIG. 6 illustrates a front view of a partial heat storage brick stack of an embodiment of the present disclosure;
fig. 7 shows a left side view of a partial heat storage brick stack of an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
It is to be understood, however, that the terms "central," "longitudinal," "lateral," "length," "width," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing or simplifying the disclosure, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be considered limiting of the disclosure.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
Fig. 1 is a main body structure view of a sludge drying apparatus according to an embodiment of the present disclosure. Fig. 2 shows an industrial flow diagram of a sludge drying apparatus according to an embodiment of the present disclosure. Fig. 3 illustrates a main body structure view of a heating unit according to an embodiment of the present disclosure. Fig. 4 shows a front view of a heat storage brick according to an embodiment of the present disclosure. Fig. 5 shows a left side view of a heat storage brick according to an embodiment of the present disclosure. Fig. 6 illustrates a front view of a partial heat storage brick stack according to an embodiment of the present disclosure. Fig. 7 shows a left side view of a partial heat storage brick stack according to an embodiment of the present disclosure. As shown in fig. 1, the sludge drying apparatus includes: a first heat exchange device 100, a heating unit 400 and a mesh belt conveyor 500. The first heat exchange device 100 is provided with a first air inlet, a first exhaust air inlet and a first air outlet, and the first air inlet is suitable for introducing external air. The air inlet end of the heating unit 400 is communicated with the first air outlet of the first heat exchanging device 100, and the heating unit 400 is provided with a heat storage device. The conveying mesh belt 500 is provided with a first gas distribution device 510 and a first gas collection device 520, and the conveying mesh belt 500 is suitable for conveying sludge to be treated. The gas collecting end of the first gas collecting device 520 faces one side of the conveying mesh belt 500 for conveying the sludge, the gas outlet end of the first gas distributing device 510 faces one side of the conveying mesh belt 500 away from the conveying sludge, the first gas distributing device 510 and the first gas collecting device 520 are oppositely arranged, and the gas inlet end of the first gas distributing device 510 is communicated with the gas outlet end of the heating device. The first gas collecting device 520 is communicated with the first gas inlet and outlet port of the first heat exchange device 100.
The present disclosure is applicable to sludge drying. The sludge to be treated is conveyed through the conveying mesh belt 500, and the first gas distribution device 510 positioned at one side of the conveying mesh belt 500, which is far away from the side for conveying the sludge to be treated, emits high-temperature gas to evaporate and dry the sludge to be treated. The water on the excrement surface of the sludge to be treated is quickly evaporated into the air by the high-temperature gas, and the first gas collecting device 520 is used for collecting the steam generated by heating the sludge to be treated by the first gas distributing device 510. The first gas collecting device 520 introduces the collected saturated steam into the first heat exchanging device 100, heats the fresh air supplemented by the first heat exchanging device 100, condenses and dehumidifies the steam collected by the first gas collecting device 520 to form dry air with lower temperature, and the heated fresh air and the condensed and dehumidified steam are introduced into the heating unit 400 together to be heated into high-temperature dry air for reuse, so that the heat of the waste gas is effectively utilized, and the heat loss is reduced. Heating unit 400 can be stored the generated heat quantity in the valley electricity period through setting up heat-retaining device, and the peak electricity period stops the electricity and changes heat, utilizes the heat energy of deposit to heat the fresh air through the heating and the steam after the condensation dehumidification, the effectual running cost that has reduceed. Furthermore, the solar heat storage system is also suitable for utilizing wind power or solar power which is not convenient for grid connection, converting electric energy generated during wind power or solar power generation into heat and storing heat energy through the heat storage device, and is lower in requirement on electric energy quality and more energy-saving and environment-friendly.
In a possible implementation, a second heat exchange device 200 and a third heat exchange device 300 are further included. The conveying mesh belt 500 is further provided with a second gas distribution device 530 and a second gas collection device 540, the gas collection end of the second gas collection device 540 faces one side of the conveying mesh belt 500 for conveying sludge, the gas outlet end of the second gas distribution device 530 faces one side of the conveying mesh belt 500 away from the conveying sludge, and the second gas distribution device 530 and the second gas collection device 540 are arranged oppositely. The first gas collecting device 520 is communicated with the first gas inlet and outlet of the first heat exchange device 100 through the third heat exchange device 300. The second heat exchanging device 200 is provided with a second air inlet, a second exhaust air inlet and a second air outlet, and the second air inlet is suitable for introducing external air. The second gas outlet is communicated with the second gas distribution device 530 through the third heat exchange device 300, and the second waste gas inlet is communicated with the second gas collecting device 540. The first gas distribution device 510 and the second gas distribution device 530 which are positioned at the side of the conveying mesh belt 500 away from the side for conveying the sludge to be treated emit high-temperature gas, and the sludge to be treated is evaporated and dried in sequence. The water content on the excrement surface of the sludge to be treated is quickly evaporated into the air by high-temperature gas, and the first gas collecting device 520 and the second gas collecting device 540 are respectively used for collecting steam generated by heating the sludge to be treated by the first gas distribution device 510 and steam generated by heating the sludge to be treated by the second gas distribution device 530. The first gas collecting device 520 sequentially introduces the collected saturated steam into the third heat exchange device 300 and the first heat exchange device 100 for heat exchange and condensation, the saturated steam enters the first heat exchange device 100 through the first waste gas inlet, the air sucked by the first heat exchange device 100 through the first air inlet is heated, the heated fresh air and the steam dehumidified by condensation are together introduced into the heating unit 400 for further heating, and the heated air is introduced into the first gas distribution device 510 for heating and evaporating the sludge to be treated. The second gas collecting device 540 introduces the collected saturated steam into the second heat exchange device 200 through the second gas inlet and outlet, heats the air sucked by the second heat exchange device 200 through the second air inlet, condenses and dehumidifies the high-temperature steam collected by the second gas collecting device 540, introduces the heated air and the condensed and dehumidified steam into the third heat exchange device 300, heats the gas introduced by the second heat exchange device 200 in the third heat exchange device 300 by the saturated steam with higher temperature collected by the first gas collecting device 520, and introduces the heated gas into the second gas distribution device 530 for heating and evaporating the sludge to be treated by the third heat exchange device 300. Through setting up first heat transfer device 100, second heat transfer device 200 and third heat transfer device 300 and utilize the high-temperature steam that first gas collecting device 520 and second gas collecting device 540 were collected respectively, heat the air, the effectual heat of utilizing the waste gas reduces the heat loss.
In one possible implementation, as shown in fig. 3, the heating unit 400 is provided with a heat exchange chamber 420, a circulation duct 410, a heat exchange pipe 460, and a hot air blower 440. The heat exchange chamber 420, the circulating air duct 410 and the hot air blower 440 are sequentially communicated with each other at the head. The heat exchange pipe 460 penetrates the heat exchange chamber 420, and two ends of the heat exchange pipe 460 are respectively communicated with the first air outlet and the first air distribution device 510. The air in the heat exchange chamber 420 and the circulating air duct 410 flows in the closed loop formed by the heat exchange chamber 420 and the circulating air duct 410 by heating and driving of the hot air blower 440, when the hot air heated by the hot air blower 440 flows through the heat exchange chamber 420, the heat exchange pipe 460 in the heat exchange chamber 420 is heated, and the air exhausted by the first heat exchange device 100 is heated by the heat exchange pipe 460 and then is introduced into the first air distribution device 510, so that the air is heated.
It should be noted that, the heat exchange chamber 420 is provided with two perforated rectification baffles 470, and the two perforated rectification baffles 470 are respectively located on the side of the heat exchange pipe 460 facing the hot air blower 440 and the side of the heat exchange pipe 460 facing away from the hot air blower 440. By arranging the porous rectifying baffle 470, the hot air delivered by the air heater 440 is guided, so that the heating efficiency of the heat exchange pipeline 460 is improved.
In one possible implementation, the heating unit 400 is further provided with a heat storage chamber 430. The heat storage device includes a heat storage brick 450 and a heating device. The hot air blower 440 communicates with the heat exchange chamber 420 through the heat storage chamber 430. Heat storage brick 450 is arranged inside the cavity of heat storage chamber 430, and heat storage brick 450 is provided with mounting hole 451. The heating means is disposed inside the cavity of the mounting hole 451. The hot air output by the air heater 440 passes through the heat storage chamber 430 and then enters the heat exchange chamber 420, the heating unit 400 is converted into heat energy by using electric energy, the heat storage chamber 430, the heat storage brick 450 and the heating device are arranged, electricity can be converted into heat energy in the valley power period, the heating device stores the converted heat energy in the heat storage brick 450, the heating device and heating elements of the air heater 440 are stopped from being powered in the flat power period and the peak power period, the air heater 440 only carries out air conveying at the moment, and heat is supplied by using the heat energy stored in the heat storage brick 450, so that the reduction of the operation cost can be realized, and the unbalanced power supply pressure of a power grid can be favorably relieved.
In one possible implementation, there are more than two heat storage bricks 450. More than two heat storage bricks 450 are stacked inside the cavity of heat storage chamber 430. Through setting up more than two heat-retaining bricks 450, promote the heat-retaining ability.
In one possible implementation, as shown in fig. 4 and 5, heat storage brick 450 is further provided with ventilation channel 453, card slot 454 and positioning part 452. The mounting holes 451 are provided through opposite sides of the heat storage brick 450. The ventilation groove 453 and the clamping groove 454 are respectively arranged on two opposite sides of the side of the heat storage brick 450 where the mounting hole 451 is arranged, the ventilation groove 453 is matched with the clamping groove 454, and the ventilation groove 453 is suitable for enabling air to flow through the heat storage brick 450. Two positioning portions 452 are provided, the two positioning portions 452 are matched with each other, and the two positioning portions 452 are respectively located on two opposite side surfaces of the heat storage brick 450 where the mounting hole 451 is provided. When the air is driven by the hot air blower 440 through the heat storage bricks 450 in the heat storage chamber 430, the air exchanges heat by passing through the ventilation grooves 453 of each heat storage brick 450.
Further, as shown in fig. 6 and 7, a plurality of heat storage bricks 450 are stacked in a three-dimensional matrix in the heat storage chamber 430, the length direction of the ventilation groove 453 is consistent with the axial direction of the installation hole 451, the length direction of the ventilation groove 453 is along the air flowing direction in the heat storage chamber 430, so that the heating device can heat more than two heat storage bricks 450 through the installation hole 451, and the heat storage bricks 450 are positioned when being stacked by arranging the clamping groove 454 and the positioning part 452, so that the installation is facilitated.
Here, it should be noted that the positioning portion 452 is a positioning protrusion and a positioning groove which are matched with each other, so that the overall structure is simple, and the production cost is effectively reduced.
Furthermore, the outer side walls of the heat storage chamber 430, the heat exchange chamber 420 and the circulating air duct 410 are all provided with heat insulation layers, so that the heat loss is further reduced.
In a possible implementation, the conveying mesh belt 500 is further provided with a sludge distributor 550. The first gas distribution device 510 and the second gas distribution device 530 are respectively close to two ends of the conveying direction of the conveying mesh belt 500, and the conveying mesh belt 500 is suitable for conveying sludge to be treated from one end close to the first gas distribution device 510 to one end close to the second gas distribution device 530. The sludge distributor 550 is located on the side of the first gas distributor 510 away from the second gas distributor 530, and the discharge port of the sludge distributor 550 faces the side of the mesh conveyor 500 conveying the sludge to be treated. The sludge spreader 550 breaks up the sludge to be treated into loose blocks, improves the air permeability and the contact area of the sludge to be treated, and evenly spreads the sludge on the conveying mesh belt 500, thereby improving the efficiency of evaporation drying. The sludge distributor 550 treats the sludge to be treated into particles with a particle size of 10mm to 20mm, and the width of the cloth on the conveying mesh belt 500 is 1m to 3m, and the thickness of the cloth is 20mm to 40mm.
In one possible implementation, the foraminous conveyor belt 500 is further provided with a shaping unit 560. The shaping unit 560 is arranged between the first gas collecting device 520 and the second gas collecting device 540, the shaping unit 560 is positioned on the side of the conveying mesh belt 500 where the sludge to be treated is conveyed, and the shaping unit 560 is suitable for crushing the sludge to be treated. After being heated and evaporated by the first air distribution device 510, the sludge to be treated enters the shaping unit 560, the sludge to be treated is further crushed by the shaping unit 560 into sludge with a particle size of 4mm to 6mm, the air permeability and the contact area of the sludge to be treated are further increased, and the moisture in the sludge to be treated can be further reduced when the sludge to be treated is heated by the second air distribution device 530.
Here, it should be noted that the shaping unit 560 is a two-stage slow-rotation crushing cutter set, so that the overall structure is simple, and the production cost is effectively reduced.
In one possible implementation, the mesh conveyor belt 500 is further provided with a slight negative pressure tank. The conveying mesh belt 500 penetrates through the micro-negative pressure tank, and the second gas collecting device 540 and the second gas distributing device 530 are both located inside a cavity of the micro-negative pressure tank. Through setting up little negative pressure case, make pending mud be in little negative pressure state when being heated by second gas distribution device 530, promote evaporation efficiency, further reduce the moisture in pending mud.
In a possible implementation manner, the system further comprises a tail gas treatment unit. The first heat exchange device 100 is further provided with a first exhaust gas outlet. The first exhaust gas outlet is respectively communicated with the gas inlet end of the heating unit 400 and the tail gas treatment unit, and the first exhaust gas outlet is suitable for discharging the exhaust gas which completes heat exchange in the first heat exchange device 100. As shown in fig. 1, after the saturated steam subjected to heat exchange in the first heat exchange device 100 is subjected to heat exchange, temperature reduction, condensation and drying, a part of the saturated steam enters the tail gas treatment device for treatment, and the other part of the saturated steam is introduced into the heating unit 400 for reuse, so that the heat loss of the saturated steam is further reduced.
In a possible implementation, the second heat exchanging device 200 is further provided with a second exhaust gas outlet. The second exhaust gas outlet is respectively communicated with the third heat exchange device 300 and the tail gas treatment unit, and the second exhaust gas outlet is suitable for discharging the exhaust gas which completes heat exchange in the second heat exchange device 200. Similar to the first heat exchange device 100, after the saturated steam subjected to heat exchange in the second heat exchange device 200 is subjected to heat exchange, temperature reduction, condensation and drying, a part of the saturated steam enters the tail gas treatment device for treatment, and the other part of the saturated steam is introduced into the second gas distribution device 530 through the third heat exchange device 300 for reuse, so that the heat loss of the saturated steam is further reduced.
Here, it should be noted that the first heat exchanger 100, the second heat exchanger 200, and the third heat exchanger 300 are all provided with condensed water discharge pipes, and are suitable for discharging condensed water generated by saturated steam condensation drying in the first heat exchanger 100, the second heat exchanger 200, and the third heat exchanger 300.
Here, it should be noted that the tail gas treatment unit 600 includes a spray absorption chamber 610, an adsorption dehumidification chamber 620, a plasma reaction chamber 630, a catalytic oxidation chamber 640, and a chimney 650. The spraying absorption chamber 610, the adsorption dehumidification chamber 620, the plasma reaction chamber 630, the catalytic oxidation chamber 640 and the chimney 650 are sequentially communicated, the first waste gas outlet and the second waste gas outlet are communicated with the spraying dehumidification chamber, the sludge is influenced by sludge components in the drying treatment process, volatile VOC gas overflows and is mixed in circulating air, and the circulating air maintains the balance of the concentration of pollutants in the circulating air through quantitative discharge and fresh air supplement. The tail gas treatment unit 600 is used for treating the exhausted circulating air to prevent pollution to the air.
The tail gas treatment unit 600 decomposes and removes pollutants by using a combination process of spray absorption, plasma decomposition, catalytic oxidation, and the like. The stack 650 discharges the recycled air up to process standards into the air.
The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A sludge drying device is characterized by comprising:
the device comprises a first heat exchange device, a heating unit and a conveying mesh belt;
the first heat exchange device is provided with a first air inlet, a first exhaust gas inlet and a first air outlet, and the first air inlet is suitable for introducing external air;
the air inlet end of the heating unit is communicated with the first air outlet of the first heat exchange device, and the heating unit is provided with a heat storage device;
the conveying mesh belt is provided with a first gas distribution device and a first gas collection device and is suitable for conveying sludge to be treated;
the gas collecting end of the first gas collecting device faces the side, away from the sludge conveying side, of the conveying net belt, the gas outlet end of the first gas distributing device faces the side, away from the sludge conveying side, of the conveying net belt, the first gas distributing device and the first gas collecting device are arranged oppositely, and the gas inlet end of the first gas distributing device is communicated with the gas outlet end of the heating device;
the first gas collecting device is communicated with the first gas inlet and exhaust port of the first heat exchange device.
2. The sludge drying device according to claim 1, further comprising a second heat exchange device and a third heat exchange device;
the conveying mesh belt is also provided with a second gas distribution device and a second gas collection device, the gas collection end of the second gas collection device faces the sludge conveying side of the conveying mesh belt, the gas outlet end of the second gas distribution device faces the side, away from the sludge conveying side, of the conveying mesh belt, and the second gas distribution device and the second gas collection device are arranged oppositely;
the first gas collecting device is communicated with the first gas inlet and outlet port of the first heat exchange device through the third heat exchange device;
the second heat exchange device is provided with a second air inlet, a second exhaust gas inlet and a second air outlet, and the second air inlet is suitable for introducing external air;
the second gas outlet is communicated with the second gas distribution device through the third heat exchange device, and the second waste gas inlet is communicated with the second gas collecting device.
3. The sludge drying device as claimed in claim 1, wherein the heating unit is provided with a heat exchange chamber, a circulating air duct, a heat exchange pipeline and a hot air blower;
the heat exchange chamber, the circulating air duct and the air heater are sequentially communicated in a head position;
the heat exchange pipeline penetrates through the heat exchange chamber, and two ends of the heat exchange pipeline are respectively communicated with the first air outlet and the first air distribution device.
4. The sludge drying device according to claim 3, wherein the heating unit is further provided with a heat storage chamber;
the heat storage device comprises a heat storage brick and a heating device;
the hot air blower is communicated with the heat exchange chamber through the heat storage chamber;
the heat storage brick is arranged in the cavity of the heat storage chamber and is provided with a mounting hole;
the heating device is arranged in the cavity of the mounting hole.
5. The sludge drying device as claimed in claim 4, wherein the number of the heat storage bricks is more than two;
more than two heat storage bricks are stacked inside the cavity of the heat storage chamber.
6. The sludge drying device as claimed in claim 5, wherein the heat storage brick is further provided with a ventilation groove, a clamping groove and a positioning part;
the mounting holes penetrate through the two opposite side surfaces of the heat storage brick;
the ventilation groove and the clamping groove are respectively positioned on two opposite side surfaces of the side of the heat storage brick where the mounting hole is formed, the ventilation groove is matched with the clamping groove, and the ventilation groove is suitable for enabling air to flow through the heat storage brick;
the positioning parts are two and matched with each other, and the two positioning parts are respectively positioned on two opposite side surfaces of the heat storage brick, which are provided with the mounting holes.
7. The sludge drying device as claimed in any one of the claims 2 to 6, wherein the conveying mesh belt is further provided with a sludge distributor;
the first gas distribution device and the second gas distribution device are respectively close to two ends of the conveying net belt in the conveying direction, and the conveying net belt is suitable for conveying the sludge to be treated from one end close to the first gas distribution device to one end close to the second gas distribution device;
the sludge distributing machine is positioned on one side of the first gas distribution device, which is deviated from the second gas distribution device, and the discharge port of the sludge distributing machine faces towards the conveying of the conveying mesh belt on one side of sludge to be treated.
8. The sludge drying device according to claim 7, wherein the conveying mesh belt is further provided with a shaping unit;
the shaping unit is arranged between the first gas collecting device and the second gas collecting device, the shaping unit is positioned on one side of the conveying net belt for conveying the sludge to be treated, and the shaping unit is suitable for crushing the sludge to be treated.
9. The sludge drying device according to claim 7, wherein the conveying mesh belt is further provided with a micro negative pressure tank;
the conveying net belt penetrates through the micro negative pressure box, and the second gas collecting device and the second gas distributing device are both located inside a cavity of the micro negative pressure box.
10. The sludge drying device according to claim 7, further comprising a tail gas treatment unit;
the first heat exchange device is also provided with a first waste gas outlet, and the second heat exchange device is also provided with a second waste gas outlet;
the first waste gas outlet is respectively communicated with the gas inlet end of the heating unit and the tail gas treatment unit, and the first waste gas outlet is suitable for discharging waste gas subjected to heat exchange in the first heat exchange device; the second waste gas outlet is respectively communicated with the third heat exchange device and the tail gas treatment unit, and the second waste gas outlet is suitable for discharging waste gas which completes heat exchange in the second heat exchange device.
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