CN211636471U

CN211636471U - Microwave crystal oscillator drying device for zero discharge of desulfurization wastewater

Info

Publication number: CN211636471U
Application number: CN201922342528.8U
Authority: CN
Inventors: 陈彦涛
Original assignee: Shanghai Tianxiao Environmental Protection Engineering Co ltd
Current assignee: Shanghai Tianxiao Environmental Protection Engineering Co ltd
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-10-09
Anticipated expiration: 2029-12-24

Abstract

The utility model relates to a microwave crystal oscillator drying device for zero discharge of desulfurization waste water, wherein the spraying end of a rotary type spraying head is downward and extends into a drying cylinder body, the liquid inlet end is communicated with crystal slurry solution, the gas inlet end is communicated with one end of a heat exchanger, and the other end of the heat exchanger is provided with an air suction inlet communicated with the heat exchanger; the drying cylinder is vertically arranged, a spiral guide chute is arranged on the inner wall of the drying cylinder from top to bottom, and a finished product discharge port is arranged at the bottom of the drying cylinder; a magnetron device for emitting microwaves to the center is arranged around the drying cylinder, an upright nested vibrating sieve tube corresponding to the magnetron device is arranged at the center of the drying cylinder, the outer ring of the nested vibrating sieve tube is a microwave scattering surface with a breathable film sandwiched therein, the inner ring is a crystal oscillator element, and an air interlayer is left between the outer ring and the inner ring; the nested vibrating screen pipe extends out of the drying cylinder body and is connected with the fan, then the air is exhausted outwards through the exhaust pipeline, the exhaust pipeline penetrates through the heat exchanger, and the air sucked in from the air suction port is heated through the heat exchanger.

Description

Microwave crystal oscillator drying device for zero discharge of desulfurization wastewater

Technical Field

The invention relates to a drying device for zero discharge of desulfurization wastewater, in particular to a microwave crystal oscillator drying device for zero discharge of desulfurization wastewater.

Background

Limestone/lime-gypsum desulfurization is a widely applied desulfurization method with high efficiency, reliability, stability, safety and low operation cost, and is the most important method for desulfurizing flue gas of thermal power coal-fired boilers for a long time. However, this method has a large problem of wastewater treatment. The wastewater generated by desulfurization contains a large amount of ions such as chloride ions, sulfate radicals, calcium, magnesium and the like, the wastewater quality is complex, and the wastewater mainly contains impurities such as suspended matters, sulfate, supersaturated sulfite, heavy metals and the like, and many pollutants are first pollutants strictly required and controlled in national environmental protection standards, become the most difficult-to-treat wastewater of a coal-fired power plant, and are the key for realizing zero discharge of the wastewater of the coal-fired power plant.

The technology related to the desulfurization wastewater zero-discharge process is more, and mainly comprises pretreatment (heavy metal removal, hardness and the like), concentration and decrement, evaporative crystallization and other technologies. For the evaporation crystallization stage, devices in various modes are adopted to obtain a crystal slurry solution which is generally a saturated suspension liquid with 20-40% of water content, and the conventional thought is to adopt a mechanical centrifugal dehydrator and a circulating fluidized bed dryer to meet the production requirement, but the defects are that the energy utilization rate is not high, too many operating devices are needed, the equipment is huge and the drying cost is high when the energy is converted into heat energy for transmission and evaporation; the mode that the wastewater is completely evaporated in the tower by the flue gas by using the high-speed rotary atomizer in the SDA dry desulfurization appears at the later stage, the equipment quantity is reduced, and the one-time investment is reduced, but due to the adoption of the method. The demand for flue gas is too large, the drying volume is increased, the volume heat transfer coefficient is lower, and dust in the flue gas can cause secondary pollution to crystal mush components, so that the purity of industrial salt is reduced. Directly affects the change of sale and cannot be converted into reasonable economic benefit.

Disclosure of Invention

The invention aims to provide a microwave crystal oscillator drying device for zero emission of desulfurization wastewater, which does not need to additionally use a flue gas or steam heat source, adopts air circulation heat transfer, utilizes a simplified rotary atomization technology to be combined with a microwave technology, completely dries a crystal slurry solution with NaCl as a main component by using a sound wave crystal oscillator and controlling circulating air quantity under the condition of meeting the theoretical result of NaCl reflection loss coefficient (less than 1/8 wavelength), and can replace a conventional centrifugal dehydration and surface drying machine to finally meet the secondary standard of industrial salt dry salt, thereby meeting the economic and environmental protection properties.

The invention adopts the following technical scheme:

a microwave crystal oscillator drying device for zero discharge of desulfurization wastewater comprises a drying cylinder, a heat exchanger and a rotary spray head 101; the spraying end of the rotary spraying head 101 faces downwards and extends into the drying cylinder, the liquid inlet end is communicated with the crystal slurry solution, the gas inlet end is communicated with one end of the heat exchanger, and the other end of the heat exchanger is provided with an air suction inlet communicated with the heat exchanger; the drying cylinder is vertically arranged, a spiral material guide groove 102 is formed in the inner wall of the drying cylinder from top to bottom, and a finished product discharge hole is formed in the bottom of the drying cylinder; a magnetron device 106 for emitting microwaves to the center is arranged around the drying cylinder, an upright nested vibrating sieve tube 104 corresponding to the magnetron device 106 is arranged at the center of the drying cylinder, the outer ring of the nested vibrating sieve tube 104 is a microwave scattering surface with a gas-permeable membrane sandwiched therein, the inner ring is a crystal oscillator element, and an air interlayer is left between the outer ring and the inner ring; the nested vibrating screen pipe 104 extends out of the drying cylinder body and is connected with a fan, and then the air is exhausted outwards through an exhaust pipeline, the exhaust pipeline penetrates through a heat exchanger, and the air sucked in from the air suction port is heated through the heat exchanger.

Preferably, the heat exchanger is a tube heat exchanger 107; the bottom of the drying cylinder body is provided with a funnel structure surrounded by a fluidization plate 108, and the bottom of the funnel structure is provided with a finished product discharge hole; an air cannon 105 for vibrating blanking is arranged on the fluidization plate 108.

Preferably, the drying cylinder is a microwave suppression section in the area above and below the coverage area of the magnetron device 106.

Preferably, the magnetron device 106 is arranged on the side wall of the drying cylinder at an angle of 120 degrees, and the ultrasonic crystal oscillators 103 are arranged on the side wall of the drying cylinder in a layered mode in the vertical direction.

Preferably, the nested vibrating screen pipe 104 is of a nested structure, the outer ring is a microwave scattering surface, the inner layer is a film-sandwiched high-molecular breathable film, the inner ring is provided with a crystal oscillator element, the middle interlayer is reserved for an air channel, the bottom of the vibrating screen is connected with a main fan, and a discharge pipe passes through a tubular heat exchanger and is discharged to the high altitude; the lower part of the heat exchanger is provided with an air suction inlet of a whole set of device, and preheated air enters the tube type heat exchanger and enters the high-speed rotating spray head; the whole set of device uses a PLC to control integrated full-automatic operation.

Preferably, the rotating speed of the high-speed rotating spray head is 15000 to 20000 revolutions per minute, the slurry is atomized through high-speed centrifugal rotation, preliminary solid-liquid separation is realized, and the solid is thrown out of the tower wall in the tangential direction and enters the spiral material guide groove to generate spiral falling motion.

Preferably, the spiral material guide chute 102 extends through the straight section of the drying cylinder body to prolong the retention time in the material cylinder.

Further, the ultrasonic crystal oscillator 103; and (4) carrying out vibration purging according to a set program to generate vibration waves and control the retention time of the materials.

Preferably, the bottom of the hopper structure is provided with a roller crusher 109 with a weighing output function.

The invention has the beneficial effects that:

1) the microwave crystal oscillator drying device for zero discharge of desulfurization wastewater is provided, other heat transfer media are not needed, and the structure is simple and reliable.

2) The equipment adopts microwave radiation energy transfer, and is medium integral heating, the drying process is uniform and thorough, thermal inertia is avoided, the speed is high, the efficiency is high, the drying period is greatly shortened, and the energy consumption is reduced.

3) The control is simple: the microwave power can be adjusted quickly and has no inertia, and the PLC automatic control system is combined to control in time, so that the adjustment and determination of the process parameters are facilitated.

4) The rotating equipment is few, the main components can be replaced by mature electronic spare parts, the accident probability is low, the maintenance is simple and convenient, the production capacity is high, and the product quality is stable;

5) has no noise, no toxic gas and liquid discharge, and belongs to the environment-friendly drying technology.

6) Main fan entry linkage is at nested vibration screen pipe tail end, and the shale shaker sets up polymer ventilated membrane (PTFE peritoneum) for nested structure, allows hot moisture to pass through, and hot moisture is taken out through tubular heat exchanger to the high altitude emission in the dry barrel, and the high altitude is discharged and also can be produced from the power of pulling out, reduces the fan energy consumption, and ordinary air gets into rotatory atomizer through tubular heat exchanger primary heating.

7) The mouth of the air suction pipe of the fan is larger than the air inlet of the rotary spray head, so that the drying cylinder generates micro vacuum negative pressure, the boiling point of water is lowered, and the drying is further accelerated;

8) the slurry solution inlet is configured with a high speed rotating spray head that atomizes the liquid as it is delivered to the high speed rotating disk as it spreads as a thin film on the rotating surface and moves at an increasing velocity toward the edge of the disk and away from the edge of the disk. The non-uniformity of the spray, which decreases with increasing rotational speed of the disc, gives a very uniform droplet distribution at a disc peripheral speed of 60 m/s. Mixing hot air, and performing primary solid-liquid separation;

9) the solid is thrown out of the tower wall in the tangential direction and enters the spiral material guide groove to generate spiral falling motion. The spiral guide chute penetrates through the straight section of the whole drying cylinder body, the retention time in the material tower is prolonged, microwaves are generated by a magnetron device on the wall of the tower, the whole straight section is heated through a microwave scattering surface of the nested vibrating sieve tube, the heating is controlled by a PLC, and the parameters are adjustable.

10) The outer wall of the cylinder body is layered with ultrasonic crystal oscillators along the spiral material guide groove. And carrying out vibration purging according to a set program to generate 8MHZ vibration waves and reasonably control the retention time of the materials.

11) The nested vibrating sieve tube is provided with a high-molecular breathable film for allowing moisture to pass through, and the nested vibrating sieve tube is connected with a main fan for pumping high-moisture heated by microwaves. Meanwhile, a crystal oscillator element and an air channel are arranged and matched with an air cannon to generate high-frequency vibration, so that crystal material particles are separated from an attachment surface, and the material is better guided to dry and fall.

12) The bottom of the drying cylinder is provided with a fluidization plate, and the wall-hanging blockage can be prevented by vibrating through a compressed air cannon. The bottom is provided with a roller crusher and has a weighing output function.

13) Aiming at the zero discharge treatment process of the desulfurization wastewater, the device is designed according to NaCl crystal slurry solution, selects a high-speed rotary spray head, adopts an 8MHZ sound wave crystal oscillator, uses 2.4Ghz microwave, can effectively dry sodium chloride salt, and meets the secondary standard of industrial salt dry salt. The function of zero discharge of waste water is achieved, and the economic benefit is obvious.

Drawings

FIG. 1 is a schematic structural diagram of a microwave crystal oscillator drying device for zero discharge of desulfurization wastewater in accordance with the present invention.

Fig. 2 is a schematic view of a rotary spray head.

Fig. 3 is a top view of the drying cylinder.

FIG. 4 is a schematic view of a nested vibrating screen configuration.

In the figure, 101, a rotary spray head, 102, a spiral guide chute, 103, an ultrasonic crystal oscillator, 104, a nested vibrating screen, 105, an air cannon, 106, a magnetron device, 107, a tubular heat exchanger, 108, a fluidization plate, 109, a roller crusher; 104A crystal oscillator element, 104B high-molecular air-permeable film, 104C microwave scattering surface, and 104D air interlayer.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

Referring to fig. 1-4, a microwave crystal oscillator drying device for zero discharge of desulfurization wastewater comprises a drying cylinder and a tubular heat exchanger. The top of the drying cylinder body is provided with a high-speed rotary spray head 101, the straight pipe section is provided with a spiral guide chute 102, the center is internally provided with a nested vibration sieve pipe 104, and the outer wall is provided with ultrasonic crystal oscillators in layers according to the spiral guide chute. Meanwhile, a magnetron device is arranged in the direction of 120 degrees on the circumference to generate microwaves for drying. The nested vibrating sieve tube is provided with a high-molecular breathable film, high-temperature moisture generated by microwave drying penetrates through the vibrating sieve tube, is pumped out of the drying cylinder body by the main fan, enters the tubular heat exchanger and is discharged to the high altitude.

In this example, referring to fig. 1, the NaCl magma solution enters the vessel at the top of the drying cylinder through a high speed rotating spray head 101; and NaCl finished salt is continuously discharged from an outlet at the conical bottom, the fluidization plate 108 is arranged at the conical bottom, and the NaCl finished salt is rapped through the compressed air cannon 105 to prevent wall-hanging blockage. The bottom is equipped with a roller crusher 109 with a weighing output function.

Referring to fig. 1, the main fan outlet evacuation line enters a tubular heat exchanger 107 to initially heat the air used by the high speed rotating atomizer head 101.

Referring to fig. 2, the NaCl magma solution and initially heated air enter the interior of the vessel through the high speed rotating spray head 101. And (3) performing primary solid-liquid separation at the microwave inhibition section on the straight upper part of the drying cylinder.

Referring to fig. 1 and 2, the liquid is atomized and, upon mixing with hot air, the solids are thrown tangentially out of the wall of the column into a helical chute 102 to produce a helical falling motion.

Referring to fig. 1, the spiral material guiding chute 102 extends through the whole straight section of the drying cylinder body, and prolongs the retention time in the material tower.

In this embodiment, referring to figures 1 and 3, the magnetron apparatus 106 of the tower wall generates microwaves which heat the entire straight pipe section by nesting the microwave scattering surfaces of the vibrating screen 104.

Referring to fig. 1, ultrasonic crystal oscillators 103 are layered on the outer wall of the cylinder along the spiral material guide chute 102. And carrying out vibration purging according to a set program to generate 8MHZ vibration waves and reasonably control the retention time of the materials.

In this embodiment, referring to fig. 1 and 2, the nested vibrating sieve tube 104 is a nested structure, and is provided with a high-molecular air permeable membrane for allowing moisture to pass through, and the nested vibrating sieve tube is connected with a main blower for extracting high-moisture heated by microwaves; meanwhile, a crystal oscillator element and an air channel are arranged simultaneously, and the air channel is matched with the air cannon 105 to generate high-frequency vibration, so that crystal material particles are separated from an attachment surface, and the material is guided to dry and fall better.

During specific work, the main blower continuously takes out hot moisture in the drying cylinder, discharges to the high altitude through tubular heat exchanger, and new air enters into the high-speed rotatory atomising head of drying cylinder through tubular heat exchanger primary heating, inside NaCl magma solution and primary heating air advance the rotatory atomising head of high speed and mix and get into drying cylinder, preliminary atomizing in the microwave suppression section, solid separation, the solid is thrown away the tower wall with tangential direction and is produced spiral whereabouts motion in entering into spiral baffle box. Meanwhile, in the whole process, drying and heating are carried out under the action of microwave radiation generated by a distributed magnetron, and proper residence time and blowing blockage are controlled by an ultrasonic crystal oscillator; hot moisture is pumped out by a main fan through a polymer membrane of the nested vibrating screen pipe and enters the tubular heat exchanger to be discharged, and the drying material is left in the drying cylinder. Under the action of an air cannon and a crystal oscillator, the screw is screwed to the conical section of the drying cylinder body, and the roller crusher is prevented from hardening and is arranged below the discharge hole.

Wherein:

high-speed rotating spray head 101: the crystal mush solution with different properties is dried as shown in figure 1, and the applicability is strong to adjust. When coarse particles are required, centrifugal pressure type nozzles are generally adopted, and when fine particles are required, a rotary atomizer is usually adopted, and the materials are wear-resistant materials such as 2205 alloy steel.

Spiral chute 102: as shown in figure 1, the spiral material guide groove penetrates through the straight section of the whole drying cylinder body, and the retention time in the material tower is prolonged. The wear-resistant material can be a ceramic-coated stainless steel sheet.

Ultrasonic crystal oscillator 103: referring to fig. 1, ultrasonic crystal oscillators are arranged on the outer wall of the cylinder body in layers along the spiral material guide chute. The vibration wave of 8MHZ is generated, the NaCl crystal has fluidity through the vibration of sound wave, the retention time of the material is reasonably controlled, the material is uniformly controlled by a PLC program, and the parameters can be modified and adjusted.

Nested vibrating screen 104: as shown in fig. 4, the device is of a nested structure, a high-molecular breathable film is arranged to allow moisture to pass through, a nested vibrating screen is connected with a main fan, and high-moisture heated by microwaves is pumped out; meanwhile, a crystal oscillator element and an air channel are arranged and matched with an air cannon to generate high-frequency vibration, so that crystal material particles are separated from an attachment surface, and the material is better guided to dry and fall.

Air cannon 105: referring to fig. 1, the apparatus is directed into the dead zone of the stored bulk material at a velocity exceeding mach (sonic velocity) with a sudden burst of a strong stream of compressed gas, and this sudden release of an expanding shock wave overcomes the material static friction and resumes the flow of the material again in the vessel.

Magnetron device 106: the magnetron is an electric vacuum device for generating microwave energy, electrons in the tube of the device interact with a high-frequency electromagnetic field under the control of a constant magnetic field and a constant electric field which are vertical to each other, and energy obtained from the constant electric field is converted into microwave energy, so that the aim of generating the microwave energy is fulfilled. The distributed use characteristic of the invention is satisfied.

The tube heat exchanger 107: the typical dividing wall type heat exchanger does not relate to dust-containing smoke because the scheme adopts heat exchange between hot moisture and clean air, is made of all stainless steel, is efficient and energy-saving, has the heat transfer coefficient of 6000-.

Fluidizing plate 108: perforated ventilation bottom plate-fluidization plate with 3-4 deg. of horizontal plane inclination. With two fluidization plates, the lower layer slopes in the opposite direction to the upper layer. Spaces are reserved below the two layers of fluidization plates and used as airflow distribution chambers, a partition plate is arranged between the two layers, and ventilation and material channels are reserved at two ends of the partition plate respectively.

While the preferred embodiments of the present invention have been described, those skilled in the art will appreciate that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a microwave crystal oscillator drying device for desulfurization waste water zero release which characterized in that:

comprises a drying cylinder, a heat exchanger and a rotary spray head (101);

the spraying end of the rotary spraying head (101) faces downwards and extends into the drying cylinder, the liquid inlet end is communicated with the crystal slurry solution, the gas inlet end is communicated with one end of the heat exchanger, and the other end of the heat exchanger is provided with an air suction inlet communicated with the heat exchanger;

the drying cylinder is vertically arranged, a spiral material guide groove (102) is formed in the inner wall of the drying cylinder from top to bottom, and a finished product discharge hole is formed in the bottom of the drying cylinder; a magnetron device (106) for emitting microwaves to the center is arranged around the drying cylinder, an upright nested vibrating sieve tube (104) corresponding to the magnetron device (106) is arranged at the center of the drying cylinder, the outer ring of the nested vibrating sieve tube (104) is a microwave scattering surface with a gas-permeable membrane sandwiched inside, the inner ring is a crystal oscillator element, and an air interlayer is left between the outer ring and the inner ring;

the nested vibrating screen pipe (104) extends out of the drying cylinder body and is connected with the fan, and then the air is exhausted outwards through the exhaust pipeline, the exhaust pipeline penetrates through the heat exchanger, and the air sucked from the air suction port is heated through the heat exchanger.

2. The microwave crystal oscillator drying device for zero discharge of desulfurization waste water according to claim 1, characterized in that: the heat exchanger is a tube heat exchanger (107); the bottom of the drying cylinder body is provided with a funnel structure surrounded by a fluidization plate (108), and the bottom of the funnel structure is provided with a finished product discharge hole; an air cannon (105) for vibrating blanking is arranged on the fluidization plate (108).

3. The microwave crystal oscillator drying device for zero discharge of desulfurization waste water according to claim 1, characterized in that: the drying cylinder is provided with microwave suppression sections in the areas above and below the coverage area of the magnetron device (106).

4. The microwave crystal oscillator drying device for zero discharge of desulfurization waste water according to claim 1, characterized in that: the magnetron device (106) is arranged on the side wall of the drying cylinder body according to an angle of 120 degrees, and the ultrasonic crystal oscillator (103) is arranged on the side wall of the drying cylinder body in a layered mode in the vertical direction.

5. The microwave crystal oscillator drying device for zero discharge of desulfurization waste water according to claim 1, characterized in that:

the nested vibrating screen pipe (104) is of a nested structure, the outer ring is a microwave scattering surface, the inner layer is a film-sandwiched high-molecular breathable film, the inner ring is provided with a crystal oscillator element, the middle interlayer is reserved for an air channel, the bottom of the vibrating screen is connected with a main fan, and a discharge pipe passes through a tubular heat exchanger and is discharged to the high altitude;

the lower part of the heat exchanger is provided with an air suction inlet of a whole set of device, and preheated air enters the tube type heat exchanger and enters the high-speed rotating spray head;

the whole set of device uses a PLC to control integrated full-automatic operation.

6. The microwave crystal oscillator drying device for zero discharge of desulfurization waste water according to claim 1, characterized in that: the rotating speed of the high-speed rotating spray head is 15000 to 20000 revolutions per minute, the slurry is atomized through high-speed centrifugal rotation, preliminary solid-liquid separation is realized, and the solid is thrown out of the tower wall in the tangential direction and enters the spiral guide chute to generate spiral falling motion.

7. The microwave crystal oscillator drying device for zero discharge of desulfurization waste water according to claim 1, characterized in that: the spiral material guide groove (102) penetrates through the straight section of the whole drying cylinder body, and the retention time in the material cylinder is prolonged.

8. The microwave crystal oscillator drying device for zero discharge of desulfurization waste water according to claim 1, characterized in that: the bottom of the funnel structure is provided with a roller crusher (109) and has a weighing output function.