CN111185025A

CN111185025A - Spray drying device, and miscellaneous salt wastewater treatment system and method

Info

Publication number: CN111185025A
Application number: CN202010138138.3A
Authority: CN
Inventors: 刘法鑫; 杜滨; 朱秀伟; 张洪建; 续文振; 史勇春
Original assignee: Shandong Tianli Energy Co ltd
Current assignee: Shandong Tianli Energy Co ltd
Priority date: 2020-03-03
Filing date: 2020-03-03
Publication date: 2020-05-22

Abstract

The invention provides a spray drying device, a mixed salt wastewater treatment system and a method, which relate to the technical field of mixed salt wastewater treatment and comprise a drying tower, wherein a first cleaning mechanism, a first cleaning mechanism cleaning brush, a first driving mechanism and a second driving mechanism are arranged in an inner cavity of the drying tower; the cleaning brush is connected with the movable end of the second driving mechanism, and the first driving mechanism is used for driving the cleaning brush to rotate in the circumferential direction of the inner cavity of the drying tower so that the cleaning brush can clean solid materials adhered to the inner wall of the drying tower; the expansion end of the second driving mechanism is connected with the first driving mechanism, the second driving mechanism is used for driving the first driving mechanism and the cleaning brush to move along the vertical direction, during use, solid materials which are bonded on the inner wall of the drying tower can be comprehensively cleaned by the aid of the first cleaning device, the solid materials in the drying tower are prevented from being accumulated for a long time and being blocked, the drying tower is not required to be stopped for cleaning, time and labor are saved, and equipment and the whole system are enabled to be produced continuously.

Description

Spray drying device, and miscellaneous salt wastewater treatment system and method

Technical Field

The invention relates to the technical field of mixed salt wastewater treatment, in particular to a spray drying device, a mixed salt wastewater treatment system and a mixed salt wastewater treatment method.

Background

Mechanical Vapor Recompression (MVR) technology is widely applied to the industries of chemical industry, metallurgy, medicine, new energy and the like, and the problem of processing the byproduct generated by the process, namely the mixed salt wastewater is always solved.

The existing process for treating MVR saturated miscellaneous salt wastewater mainly comprises a centrifugal mechanical dehydration and thermal drying technology and a spray drying technology, wherein the centrifugal mechanical dehydration and thermal drying technology is to convey supersaturated solution into a centrifugal machine for spin-drying, mechanically separate precipitated crystal particles, convey the mechanically dehydrated miscellaneous salt to the water content of about 3% -5% into thermal drying equipment (such as a fluidized bed) for deep thermal drying, reduce the water content to below 0.5%, and then package; the spray drying technology is that saturated solution is directly fed into a spray dryer after being simply filtered, water is evaporated and removed by contacting the solution with hot air in the dryer, and dehydrated miscellaneous salt particles enter subsequent packaging, so that the water content can be reduced to below 1%.

The two processes can remove water in the miscellaneous salt wastewater, but if the miscellaneous salt wastewater is organic wastewater, the miscellaneous salt wastewater contains a large amount of organic matters, grease and the like, the viscosity of the materials is high, and when the materials are treated by adopting a centrifugal dehydration technology and a thermal drying technology, the materials are very easy to adhere to the inner surface of mechanical dehydration equipment, and the normal work of the equipment can be influenced along with the accumulation of time, so that the dehydration equipment needs to be cleaned regularly, time and labor are wasted, and the production continuity of the equipment and the whole system is influenced.

Disclosure of Invention

The invention aims to provide a spray drying device and a miscellaneous salt treatment system, which aim to solve the technical problems that when the existing centrifugal dehydration technology and thermal drying technology are used for treating organic miscellaneous salt wastewater, materials are very easy to adhere to the inner surface of mechanical dehydration equipment, and the normal operation of the equipment is influenced along with the accumulation of time, so that the dehydration equipment needs to be cleaned regularly, time and labor are wasted, and the production continuity of the equipment and the whole system is influenced.

The spray drying device comprises a drying tower, wherein a first cleaning mechanism is arranged in an inner cavity of the drying tower and comprises a cleaning brush, a first driving mechanism and a second driving mechanism;

the cleaning brush is connected with the movable end of the second driving mechanism, and the first driving mechanism is used for driving the cleaning brush to rotate in the circumferential direction of the inner cavity of the drying tower so as to enable the cleaning brush to clean solid materials adhered to the inner wall of the drying tower;

the movable end of the second driving mechanism is connected with the first driving mechanism, and the second driving mechanism is used for driving the first driving mechanism and the cleaning brush to move along the vertical direction.

Further, first clearance mechanism includes annular linking bridge, first actuating mechanism's expansion end with annular linking bridge connects, the quantity of brush cleaner is a plurality of, and the interval sets up on annular linking bridge's the circumference outer wall, first actuating mechanism can drive annular linking bridge with the brush cleaner is at the horizontal plane internal rotation.

Furthermore, the spray drying device comprises a second cleaning mechanism, the second cleaning mechanism is arranged outside the drying tower, the second cleaning mechanism comprises a vibrator, and the vibrator is used for knocking the outer wall of the drying tower so as to enable the solid materials bonded on the inner wall of the drying tower to shake off.

Furthermore, the number of the rappers is multiple, and the rappers are uniformly distributed on the circumferential outer wall of the drying tower.

A miscellaneous salt wastewater treatment system comprises a calcining device, a material conveying mechanism and the spray drying device;

the discharge port of the spray drying device is connected with the feed port of the calcining device through the material conveying mechanism, and the calcining device is used for calcining the solid material treated by the spray drying device.

Furthermore, the calcining device comprises a cylinder, a calcining kiln and a third driving mechanism, wherein the cylinder is obliquely arranged, one part of the cylinder penetrates through the calcining kiln, and the calcining kiln heats the cylinder;

the cylinder body is provided with a cylinder body inlet and a cylinder body inlet, and the position of the cylinder body inlet is higher than that of the cylinder body outlet;

the third driving mechanism is connected with the cylinder through a transmission assembly and used for driving the cylinder to rotate.

Further, a material raising plate is arranged on the inner wall of the cylinder body and used for stirring the solid materials in the cylinder body.

Further, the miscellaneous salt wastewater treatment system comprises a blower and a heat exchanger; the air blower is connected with an inlet of the heat exchanger, and an outlet of the heat exchanger is connected with a hot air inlet of the drying tower and used for conveying hot air into the drying tower.

Further, the mixed salt wastewater treatment system comprises a first purification device and a second purification device;

the first purification device comprises a first dry dust collector, a first wet dust collector and a first induced draft fan which are sequentially connected, and an inlet of the first dry dust collector is communicated with the spray drying device and used for treating the dried tail gas;

the second purification device comprises a second dry dust collector, a second wet dust collector and a second induced draft fan which are sequentially connected, wherein an inlet of the second dry dust collector is communicated with the calcining device and is used for treating tail gas generated after the solid material is calcined.

A method for treating miscellaneous salt wastewater comprises the following steps:

carrying out atomization treatment on the mixed salt wastewater;

drying the miscellaneous salt wastewater after atomization treatment by using heating gas to obtain a solid material;

and calcining the dried solid material.

The spray drying device comprises a drying tower, wherein a first cleaning mechanism is arranged in an inner cavity of the drying tower and comprises a cleaning brush, a first driving mechanism and a second driving mechanism; the cleaning brush is connected with the movable end of the second driving mechanism, and the first driving mechanism is used for driving the cleaning brush to rotate in the circumferential direction of the inner cavity of the drying tower so as to enable the cleaning brush to clean solid materials adhered to the inner wall of the drying tower; second actuating mechanism's expansion end with first actuating mechanism connects, second actuating mechanism is used for the drive first actuating mechanism with the brush cleaner moves along vertical direction, and during the use, the inner wall circumferential direction of drying tower is followed to first actuating mechanism drive brush cleaner to make the brush cleaner can be with bonding the ascending solid material clearance of inner wall circumference, and second actuating mechanism can drive first actuating mechanism and brush cleaner and move along vertical direction in the drying tower, makes the brush cleaner can follow the vertical direction of drying tower inner wall and clear up. According to the spray drying device provided by the invention, the first cleaning device can be used for comprehensively cleaning the solid materials adhered to the inner wall of the drying tower, so that the solid materials in the drying tower are prevented from being accumulated for a long time and being blocked, the drying tower is not required to be stopped for cleaning, the time and the labor are saved, and the equipment and the whole system are continuously produced.

The miscellaneous salt wastewater treatment system provided by the invention comprises a calcining device, a material conveying mechanism and the spray drying device; the discharge port of the spray drying device is connected with the feed port of the calcining device through the material conveying mechanism, and the calcining device is used for calcining the solid material treated by the spray drying device. The whole system is operated continuously, the dried solid material is conveyed to a calcining device by a material conveying mechanism to be calcined, and the phenol naphthalene and the macromolecular hydrocarbon are calcined into carbon dioxide and water, so that the environment is prevented from being polluted; and the whole process is continuous and non-intermittent operation, so that the efficiency of treating the organic mixed salt wastewater is improved.

The method for treating the miscellaneous salt wastewater provided by the invention atomizes the miscellaneous salt wastewater; drying the miscellaneous salt wastewater after atomization treatment by using heating gas to obtain a solid material; the solid material after drying treatment is calcined, the solid material after drying treatment of the miscellaneous salt wastewater is burnt, and phenol naphthalene and macromolecular hydrocarbons are converted into carbon dioxide and water by baking, so that the harm of direct discharge to the environment is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a spray drying device provided in an embodiment of the present invention;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

FIG. 3 is a block diagram of a system for treating miscellaneous salt wastewater according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a calcining apparatus of a mixed salt wastewater treatment system according to an embodiment of the present invention.

Icon: 10-a spray drying device; 20-a calcination device; 31-a miscellaneous salt waste water storage tank; 32-a high pressure pump; 41-a blower; 42-a heat exchanger; 50-a scraper conveyor; 61-a first dry precipitator; 62-a first wet scrubber; 63-a first induced draft fan; 71-a second dry precipitator; 72-a second wet scrubber; 73-a second induced draft fan; 100-a drying tower; 101-a hot air inlet; 102-a tail gas outlet; 103-a discharge hole; 104-manhole; 110-an atomizer; 120-a first cleaning mechanism; 121-a drive motor; 122-oil cylinder; 123-annular connecting bracket; 124-cleaning brush; 130-a second cleaning mechanism; 210-roasting kiln; 211-a heater; 220-barrel body; 221-a material raising plate; 222-barrel inlet; 223-outlet of the cylinder; 230-a support base; 241-cylinder motor; 242-gear; 243-ring gear.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 and fig. 2, in the spray drying device 10 provided by the present invention, a first cleaning mechanism 120 is disposed in an inner cavity of the drying tower 100, and the first cleaning mechanism 120 includes a cleaning brush 124, a first driving mechanism and a second driving mechanism; the cleaning brush 124 is connected with the movable end of the second driving mechanism, and the first driving mechanism is used for driving the cleaning brush 124 to rotate in the circumferential direction of the inner cavity of the drying tower 100, so that the cleaning brush 124 can clean the solid materials adhered to the inner wall of the drying tower 100; the movable end of the second driving mechanism is connected with the first driving mechanism, and the second driving mechanism is used for driving the first driving mechanism and the cleaning brush 124 to move along the vertical direction.

During the use, first actuating mechanism drive brush cleaner 124 is along the inner wall circumferential direction of drying tower 100 to make brush cleaner 124 can be with bonding the solid material clearance in inner wall circumference, second actuating mechanism can drive first actuating mechanism and brush cleaner 124 and follow vertical direction motion in drying tower 100, make brush cleaner 124 can clear up along the vertical direction of drying tower 100 inner wall. According to the spray drying device 10 provided by the invention, the solid materials adhered to the inner wall of the drying tower 100 can be comprehensively cleaned by using the first cleaning device, the solid materials in the drying tower 100 are prevented from being accumulated for a long time and being blocked, the drying tower 100 is not required to be cleaned by stopping the machine, the time and the labor are saved, and the equipment and the whole system are continuously produced.

Specifically, the organic mixed salt wastewater is treated by the MVR, enters the mixed salt wastewater storage tank 31 for temporary storage, and is pressurized and conveyed into the atomizer 110 by the high-pressure pump 32.

The spray drying device 10 comprises a drying tower 100, wherein an atomizer 110 is arranged in the drying tower 100 and is used for atomizing organic miscellaneous salt wastewater entering the drying tower 100, and a hot air inlet 101 communicated with an inner cavity of the drying tower 100 is arranged on the drying tower 100 and is used for sending hot air into the drying tower 100 and drying the atomized miscellaneous salt wastewater.

The hot interior may enter the interior of the drying tower 100 from a tangential direction.

The drying tower is provided with a tail outlet 102 for discharging gas generated in the drying process of the organic mixed salt wastewater.

The first drive mechanism may be a drive motor 121; the second driving mechanism may be the oil cylinder 122 or an air cylinder.

Preferably, a manhole 104 may be provided on the upper side wall of the drying tower 100, if the atomizer 110 has a problem, such as blockage, the pump may be temporarily stopped, and the nozzle of the atomizer 110 may be manually replaced by opening the manhole 104, during the replacement process, only the pump is stopped, other devices are not stopped, and the time for replacing the nozzle is only 30 min. The spray head is arranged near the access hole 104, so that the access space is met, and the manual operation is simple; the whole process of the drying tower 100 is in a negative pressure mode, namely after the access hole 104 is opened, gas in the tower is not sprayed outwards, and air is sent into the tower, so that the working environment and conditions meet the construction requirements, and the spray heads can be replaced on line without influencing production.

The organic wastewater is atomized by the atomizer 110, the liquid needs to be pressurized by the high-pressure pump 32, the high-pressure liquid is sprayed out through one or a plurality of apertures with very small diameters on the spray head, the size of liquid drops and the size of formed fog clusters are related to the pressure and the aperture form of the liquid, and the forms of the spray head are different according to different solid materials.

In the embodiment, the miscellaneous salt wastewater is organic miscellaneous salt wastewater, the components are complex, the viscosity is high, a spraying device with high pressure and small nozzle aperture is needed, and formed fog drops are small and uniform to form fog clusters.

During the use, utilize the hot-blast in getting into drying tower 100, can carry out drying process with the miscellaneous salt waste water after the atomizer 110 atomization process, generate solid-state solid material, first clearance mechanism 120 can be with bonding the solid material clearance on drying tower 100 inner wall, prevents that solid material from accumulating on the inner wall, need not shut down regularly to clear up drying tower 100, saves time and manpower to make equipment and entire system production continuous.

The cleaning brushes 124, the first driving mechanism and the second driving mechanism are all arranged inside the drying tower 100, the cleaning brushes 124 are distributed uniformly in the circumferential direction of the drying tower 100, the first driving mechanism is connected with each cleaning brush 124 through the annular connecting support 123 and can drive the cleaning brushes 124 to horizontally rotate in the horizontal plane, and therefore solid materials on the inner wall of the drying tower 100 are cleaned completely.

Specifically, the first cleaning mechanism 120 includes an annular connecting bracket 123, an output shaft of the driving motor 121 is connected to the center of the annular connecting bracket 123, and the output shaft is perpendicular to the plane of the annular connecting bracket 123 to drive the annular connecting bracket 123 to rotate, so as to drive the cleaning brush 124 installed on the outer wall thereof to rotate, the rotating cleaning brush 124 can clean the solid material adhered to the inner wall of the drying tower 100, and the solid material can be discharged through the bottom discharge hole 103 of the drying tower due to the gravity.

The number of the cleaning brushes 124 is multiple, and the cleaning brushes are arranged on the circumferential outer wall of the annular connecting bracket 123 at intervals, and the driving motor 121 can drive the annular connecting bracket 123 and the cleaning brushes 124 to rotate in the horizontal plane.

In this embodiment, six cleaning brushes 124 are evenly distributed along the circumference of the connecting support, so that solid materials on the inner wall can be continuously and timely cleaned, and each cleaning brush 124 comprises a plurality of sub-cleaning brushes arranged along the vertical direction, so that the cleaning brushes 124 can clean a larger area.

In this embodiment, each sweeper brush 124 includes three sub-sweeper brushes.

Preferably, the spray drying device 10 comprises a second cleaning mechanism 130, the second cleaning mechanism 130 being arranged outside the drying tower 100, the second cleaning mechanism 130 comprising a rapper for rapping the outer wall of the drying tower 100 to shake off solid material adhering to the inner wall of the drying tower 100.

Preferably, the number of rappers is multiple and evenly distributed on the circumferential outer wall of the drying tower 100.

Specifically, the number of the rappers is multiple, and the rappers are arranged at intervals in the circumferential direction of the outer wall of the drying tower 100, so that the outer wall of the drying tower 100 can be better rapped, and solid materials adhered to the inner wall can be removed.

In this embodiment, four rappers are uniformly distributed on the circumferential outer wall of the drying tower 100, and optionally, the outer wall can be rapped at intervals.

The vibrator can select ZFB type bulkhead vibrator, which is the centrifugal action generated by the high-speed rotation of the novel vibration motor to make the vibrator vibrate at high frequency, thus eliminating the friction between the solid material and the bulkhead and the relative stability between the solid materials in the bin, and further making the solid material discharge from the bin mouth smoothly.

It should be noted that, the operator can select the vibrators with different vibration forces according to the shape and the characteristics of the solid material. If the conical bin has larger surface rigidity, larger vibration force can be properly selected, and the pyramid-shaped bin can be properly smaller, if a single bin has poor effect, two or more bins can be selected for assembly, or a bin wall vibrator, also called a bin wall vibrator, is directly connected with an activator in the bin, so that the using effect is improved.

As shown in fig. 3 and 4, the miscellaneous salt wastewater treatment system comprises a calcining device 20, a material conveying mechanism and a spray drying device 10.

The discharge port 103 of the spray drying device 10 is connected with the feed port of the calcining device 20 through a material conveying mechanism, and the calcining device 20 is used for calcining the solid material processed by the spray drying device 10.

Specifically, the solid material conveying mechanism is a scraper conveyor 50, one end of the scraper conveyor 50 is connected with the discharge port 103 of the spray drying device 10, and the other end is connected with the feed port of the calcining device 20, so that the solid material in the spray drying device 10 can be conveyed to the calcining device 20 for calcining.

As shown in fig. 4, the calcining apparatus 20 includes a cylinder 220, a calcining kiln 210, and a third driving mechanism, the cylinder 220 is disposed obliquely, a part of the cylinder 220 penetrates the calcining kiln 210, and the calcining kiln 210 is used for heating the cylinder 220.

The cylinder 220 is provided with a cylinder inlet 222 and a cylinder outlet 223, and the position of the cylinder inlet 222 is higher than that of the cylinder outlet 223. Wherein, the cylinder inlet 222 is used for feeding the organic solid material processed by the drying tower 100 into the cylinder, and the cylinder outlet 223 is used for discharging the calcined solid material and gas.

The third driving mechanism is connected with the cylinder 220 through a transmission assembly and is used for driving the cylinder 220 to rotate.

Specifically, a part of the obliquely arranged cylinder 220 penetrates through the interior of the roasting kiln 210, a heater 211 is arranged in the roasting kiln 210 and used for heating the outer wall of the cylinder 220, two ends of the roasting kiln 210 are sealed by adopting sealing structures, the air leakage coefficient of the system is small, the oxygen content in the system is easier to control, and the safety of the system is ensured.

Two ends of the cylinder 220 extending out of the roasting kiln 210 are respectively provided with a supporting seat 230, the cylinder 220 is rotatably connected with the supporting seats 230, and one end of the cylinder 220 is provided with a third driving mechanism for driving the cylinder 220 to rotate.

The third driving mechanism comprises a cylinder motor 241, a gear 242 and a gear ring 243 arranged on the outer wall of the cylinder 220, the cylinder motor 241 can drive the gear 242 to rotate, the gear 242 is meshed with the gear ring 243, and the cylinder motor 241 can drive the cylinder 220 to rotate through the gear 242 and the gear ring 243, so that the solid materials in the cylinder 220 can be fully calcined.

The calciner 210 may be electrically or naturally gas heated, may be fired in a manner similar to a cement calciner, or may be a calciner with a lining of refractory bricks.

Preferably, a material raising plate 221 is disposed on the inner wall of the barrel 220 for stirring the solid material in the barrel 220.

Specifically, a plurality of lifting blades 221 are arranged on the circumferential inner wall of the cylinder 220, so that solid materials entering the cylinder 220 can be stirred and lifted.

The solid materials are dynamically calcined in the barrel 220, that is, the solid materials are not in a static state in the equipment, although the temperature in the kiln is 800 ℃, the barrel 220 in the roasting kiln 210 continuously rotates, the solid materials are just in the barrel 220, the lifter plate 221 is arranged in the barrel 220, the solid materials are continuously stirred and lifted along with the rotation of the barrel 220, and the barrel 220 is inclined and is continuously lifted and simultaneously conveyed from the high-end feeding end to the low-end discharging end.

The solid material is in the dynamic calcination, and the solid material is continuous to be raised, falls down, and solid material dispersion is effectual, can accelerate the frequency with the contact of pivoted barrel 220 inner wall, and the solid material is continuous to be turned over the stir-fry, and is even with the contact of barrel 220 inner wall, and the heating is even, can not heat phenomenons such as inhomogeneous, partly overburning, partly not burning.

It should be noted that the calcining temperature of the calcining kiln 210 can be adjusted according to the solid material and the working requirement, and the temperature change is small, and can be stabilized at the set temperature, and the temperature difference between the upper and lower temperature is not more than 5 ℃.

The miscellaneous salt wastewater treatment system comprises a blower 41 and a heat exchanger 42; the blower 41 is connected to an inlet of the heat exchanger 42, and an outlet of the heat exchanger 42 is connected to a hot air inlet 101 of the drying tower 100, for supplying hot air into the drying tower 100.

The hot air is generated by pressing clean air into the heat exchanger 42 by the blower 41 and heating the air, and the heated air is sent into the drying tower 100.

It should be noted that the hot air can be tangentially fed into the drying tower 100, and when drying, the hot air is mixed with the fog cluster at the periphery of the fog cluster in a centrifugal rotation direction, so that the contact range of the fog cluster and the hot air can be expanded, the dropping time of the fog cluster can be prolonged, the liquid of the fog cluster, namely the solid material, is spirally dropped in the drying tower 100 in a rotation mode, the drying time is prolonged, and the drying effect is deepened.

The temperature of the hot air entering the drying tower 100 is 150-400 ℃, the air inlet temperature of the drying tower 100 can be adjusted according to the requirements of solid materials and working requirements, and the temperature range is adjustable from 150 ℃ to 400 ℃.

The mixed salt wastewater treatment system comprises a first purification device and a second purification device; the first purification device comprises a first dry dust collector 61, a first wet dust collector 62 and a first induced draft fan 63 which are connected in sequence, and an inlet of the first dry dust collector 61 is communicated with the spray drying device 10 and used for treating the dried tail gas; the second purification device comprises a second dry dust collector 71, a second wet dust collector 72 and a second induced draft fan 73 which are connected in sequence, and an inlet of the second dry dust collector 71 is communicated with the calcining device 20 and is used for treating tail gas generated after the solid material is calcined.

Specifically, an inlet of the first dry dust collector 61 is connected to the tail gas outlet 102 of the drying tower 100, and a first outlet is provided at the bottom of the first dry dust collector 61, and the first outlet is connected to the calcining device 20 through a material conveying mechanism, and is used for calcining the solid material particles in the dried tail gas.

The inlet of the second dry dust collector 71 is communicated with the outlet 223 of the cylinder of the calcining device 20 and is used for treating tail gas generated after the solid material is calcined; the bottom of the second dry dust collector 71 is provided with a second outlet for discharging the calcined solid matters without harm, thereby facilitating the packaging and the subsequent treatment.

It should be noted that, the first purification device and the second purification device may also adopt a dust removal operation in the electric dust removal process.

The first purification device and the second purification device both adopt equipment meeting the standard and can meet the corresponding environmental protection standard.

The production process of the organic mixed salt wastewater treatment system provided by the invention comprises the following steps:

the first stage process: after being treated by MVR, the organic miscellaneous salt wastewater enters a miscellaneous salt wastewater storage tank 31 for temporary storage, then is pressurized and conveyed into a special atomizer 110 through a high-pressure pump 32, the organic wastewater is sprayed into a fog cluster to be beneficial to thermal dehydration, hot air dries the atomized organic miscellaneous salt wastewater in a drying tower 100, the hot air is generated by pressing clean atmosphere into a heat exchanger 42 through an air blower 41 to be heated, the temperature can be adjusted from 150 ℃ to 400 ℃, the dried tail gas enters a first dry dust collector 61 and a first wet dust collector 62 to be cleaned, then is discharged into the atmosphere under the action of a first induced draft fan 63, and the solid material dried by the drying tower 100 enters a calcining device 20 through a scraper conveyor 50 to be subjected to secondary process treatment;

and a second-stage process: the dried solid material enters the cylinder 220 in the roasting kiln 210 through the scraper conveyor 50, the temperature in roasting can reach 800 ℃ at the highest through the high-temperature environment generated by the heater 211 in the roasting kiln 210, the dynamic roasting is performed in the cylinder 220, the solid material is continuously stirred, lifted and conveyed in the cylinder 220, organic matters in the solid material are fully and thoroughly roasted, and the solid material does not contain substances harmful to the environment any more. And tail gas generated by calcination enters the second dry dust collector 71 and the second wet dust collector 72 for washing, and is discharged into the atmosphere by the second induced draft fan 73 after the tail gas reaches the emission standard. The calcined finished solid substance has no harm and can be packaged and subsequently treated.

A method for treating miscellaneous salt wastewater comprises the following steps: carrying out atomization treatment on the mixed salt wastewater; drying the miscellaneous salt wastewater after atomization treatment by using heating gas to obtain a solid material; and calcining the dried solid material.

Specifically, the method for treating miscellaneous salt wastewater provided by the invention depends on the miscellaneous salt wastewater treatment system, and utilizes the atomizer 110 arranged in the spray drying device 10 to atomize the organic miscellaneous salt wastewater entering the drying tower 100; conveying hot air into the drying tower 100 by using the air blower 41 and the heat exchanger 42, and drying the atomized miscellaneous salt wastewater into a solid material in heat; and (3) conveying the solid material into a calcining device by using a material conveying mechanism to perform dynamic calcination.

Because the solid material adopts a high-temperature calcination mode, the solid material after the drying treatment of the miscellaneous salt wastewater can be burnt, and the phenol naphthalene and macromolecular hydrocarbons are roasted and converted into carbon dioxide and water, thereby avoiding the harm of direct discharge to the environment.

In summary, in the spray drying device 10 provided by the present invention, the spray drying device 10 includes the drying tower 100, the first cleaning mechanism 120 is disposed in the inner cavity of the drying tower 100, and the first cleaning mechanism 120 includes the cleaning brush 124, the first driving mechanism and the second driving mechanism; the cleaning brush 124 is connected with the movable end of the second driving mechanism, and the first driving mechanism is used for driving the cleaning brush 124 to rotate in the circumferential direction of the inner cavity of the drying tower 100, so that the cleaning brush 124 can clean the solid materials adhered to the inner wall of the drying tower 100; the movable end of the second driving mechanism is connected with the first driving mechanism, and the second driving mechanism is used for driving the first driving mechanism and the cleaning brush 124 to move along the vertical direction. During the use, first actuating mechanism drive brush cleaner 124 is along the inner wall circumferential direction of drying tower 100 to make brush cleaner 124 can be with bonding the solid material clearance in inner wall circumference, second actuating mechanism can drive first actuating mechanism and brush cleaner 124 and follow vertical direction motion in drying tower 100, make brush cleaner 124 can clear up along the vertical direction of drying tower 100 inner wall. According to the spray drying device 10 provided by the invention, the solid materials adhered to the inner wall of the drying tower 100 can be comprehensively cleaned by using the first cleaning device, the solid materials in the drying tower 100 are prevented from being accumulated for a long time and being blocked, the drying tower 100 is not required to be cleaned by stopping the machine, the time and the labor are saved, and the equipment and the whole system are continuously produced.

The miscellaneous salt wastewater treatment system provided by the invention comprises a calcining device 20, a material conveying mechanism and the spray drying device 10, wherein a discharge hole 103 of the spray drying device 10 is connected with a feed inlet of the calcining device 20 through the material conveying mechanism, and the calcining device 20 is used for calcining the solid material treated by the spray drying device 10. The whole system is operated continuously, the dried organic solid material is conveyed to the calcining device 20 by the material conveying mechanism to be calcined, and the dried solid material is burnt to calcine, for example, phenol naphthalene and macromolecular hydrocarbon into carbon dioxide and water, so that the environment pollution can be prevented; and the whole process is continuous and non-intermittent operation, so that the efficiency of treating the organic mixed salt wastewater is improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A spray drying device is characterized by comprising a drying tower, wherein a first cleaning mechanism is arranged in an inner cavity of the drying tower and comprises a cleaning brush, a first driving mechanism and a second driving mechanism;

2. The spray drying device according to claim 1, wherein the first cleaning mechanism comprises an annular connecting bracket, the movable end of the first driving mechanism is connected with the annular connecting bracket, the number of the cleaning brushes is multiple, the cleaning brushes are arranged on the circumferential outer wall of the annular connecting bracket at intervals, and the first driving mechanism can drive the annular connecting bracket and the cleaning brushes to rotate in a horizontal plane.

3. A spray drying device according to claim 2, wherein the spray drying device comprises a second cleaning mechanism, the second cleaning mechanism being arranged outside the drying tower, the second cleaning mechanism comprising a rapper for rapping the outer wall of the drying tower to shake off solid material that is adhered to the inner wall of the drying tower.

4. A spray drying device according to claim 3, wherein said rappers are in number and are evenly distributed over the circumferential outer wall of the drying tower.

5. A miscellaneous salt waste water treatment system, characterized in that the miscellaneous salt waste water treatment system comprises a calcining device, a material conveying mechanism and a spray drying device according to any one of claims 1 to 4;

6. The miscellaneous salt wastewater treatment system according to claim 5, wherein the calcination apparatus comprises a cylinder, a roasting kiln, and a third drive mechanism, the cylinder is disposed obliquely, and a part of the cylinder is inserted into the roasting kiln for heating the cylinder;

the cylinder is provided with a cylinder inlet and a cylinder outlet, and the position of the cylinder inlet is higher than that of the cylinder outlet;

7. The miscellaneous salt wastewater treatment system of claim 6, wherein the inner wall of the barrel is provided with a material raising plate for stirring the solid materials in the barrel.

8. The miscellaneous salt wastewater treatment system of claim 5, wherein the miscellaneous salt wastewater treatment system comprises a blower and a heat exchanger; the air blower is connected with an inlet of the heat exchanger, and an outlet of the heat exchanger is connected with a hot air inlet of the drying tower and used for conveying hot air into the drying tower.

9. The miscellaneous salt wastewater treatment system of claim 5, wherein the miscellaneous salt wastewater treatment system comprises a first purification device and a second purification device;

10. The method for treating the miscellaneous salt wastewater is characterized by comprising the following steps of:

carrying out atomization treatment on the mixed salt wastewater;

and calcining the dried solid material.