CN110697823B - Desulfurization wastewater drying device and method - Google Patents
Desulfurization wastewater drying device and method Download PDFInfo
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- CN110697823B CN110697823B CN201911062569.XA CN201911062569A CN110697823B CN 110697823 B CN110697823 B CN 110697823B CN 201911062569 A CN201911062569 A CN 201911062569A CN 110697823 B CN110697823 B CN 110697823B
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- 239000002351 wastewater Substances 0.000 title claims abstract description 122
- 238000001035 drying Methods 0.000 title claims abstract description 92
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 52
- 230000023556 desulfurization Effects 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims description 12
- 239000003546 flue gas Substances 0.000 claims abstract description 106
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 103
- 239000000779 smoke Substances 0.000 claims description 28
- 238000000889 atomisation Methods 0.000 claims description 27
- 238000001704 evaporation Methods 0.000 claims description 18
- 206010022000 influenza Diseases 0.000 claims description 11
- 238000010992 reflux Methods 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000010354 integration Effects 0.000 abstract description 2
- 239000003814 drug Substances 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 230000008020 evaporation Effects 0.000 description 13
- 239000002956 ash Substances 0.000 description 11
- 230000001105 regulatory effect Effects 0.000 description 10
- 230000009471 action Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000004065 wastewater treatment Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009692 water atomization Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
- C02F1/12—Spray evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a desulfurization waste water drying device, which comprises a high-temperature flue gas inlet flue, an outer flue baffle door, an inner flue baffle door, an outer flue, an inner flue, radial swirl vanes, a waste water feeding port, an atomizing disk, a drying tower and axial swirl vanes; the high-temperature flue gas inlet flue is communicated with the outer flue and the inner flue, the outer flue is connected with the outer flue baffle door, and the inner flue is connected with the inner flue baffle door; the inside of the outer flue is provided with radial swirl blades with the same rotation direction and angle, and the inside of the inner flue is provided with axial swirl blades with the same rotation direction and angle; the wastewater feeding port is connected with the wastewater atomizing disk; the outlet of the atomizing disk is arranged at the upper part of the drying tower; meanwhile, a desulfurization wastewater drying method is also disclosed. The device has the advantages of reasonable structure, high integration level, full waste water drying, reduced corrosion hidden danger, low investment cost, wide treatment capacity, flexible adjustment, stable operation, no need of adding any chemical medicine and the like.
Description
Technical Field
The invention relates to the technical field of desulfurization waste water treatment of thermal power plants, in particular to a desulfurization waste water drying device and method.
Background
At present, most of wet desulfurization wastewater treatment systems of thermal power plants in China adopt a traditional triple box process, but the overall operation rate is very low. The concentration of Cl - in the desulfurization wastewater treated by the conventional treatment system is high and cannot be removed. The treated wastewater cannot be recycled due to the high concentration of Cl -. In view of environmental protection requirements and economic benefits, the realization of zero wastewater discharge by adopting advanced treatment technology is a necessary trend of wastewater treatment. At present, the existing domestic desulfurization wastewater zero-emission technology comprises evaporation crystallization, direct flue injection and the like, wherein the investment and the operation cost of the evaporation crystallization technology are higher, the direct flue injection technology also has certain limitation, if the desulfurization wastewater emission is large, the wastewater is directly injected into a flue, the droplets can not be completely evaporated, and the residual droplets directly enter a flue dust removal system, so that the temperature of the main flue gas is lower than the acid dew point, and corrosion and potential safety hazards are caused to a dust remover, downstream equipment and the like. Spray drying is a common way to dry desulfurization waste water. The method comprises the steps of introducing a drying medium (hot air or flue gas and the like) into a drying chamber, atomizing desulfurization wastewater into wastewater mist drops by an atomization spray gun, spraying the wastewater mist drops into the drying chamber, and drying the wastewater mist drops in the drying chamber by contacting the drying medium to form salt particles. According to the scheme disclosed in application number 201811315095.0, the height of the drying chamber is more than three times of the diameter of the drying chamber, the evaporation distance of the drying chamber is long, the diameter of the drying chamber is small, and the defects that the wall surface is scaled and the drying is insufficient due to the fact that desulfurization waste water fog drops impact the inner wall surface of the drying chamber are easily caused.
Disclosure of Invention
The invention aims to provide a desulfurization waste water drying device and method, which are used for solving the problems of long process flow, high investment cost and high operation and maintenance cost of the existing desulfurization waste water treatment system, and the technical problems of flue corrosion caused by adopting a flue evaporation technology, large volume of a thin high-type drying chamber device and easy scaling of the wall surface, thereby causing potential safety hazard.
In order to achieve the above purpose, the invention adopts the following technical scheme:
A desulfurization waste water drying device comprises a high-temperature flue gas inlet flue, an outer flue baffle door, an inner flue baffle door, an outer flue, an inner flue, radial swirl vanes, a waste water feeding port, an atomizing disk, a drying tower and axial swirl vanes; the high-temperature flue gas inlet flue is communicated with the outer flue and the inner flue, the outer flue is connected with the outer flue baffle door, and the inner flue is connected with the inner flue baffle door; the inside of the outer flue is provided with radial swirl blades with the same rotation direction and angle, and the inside of the inner flue is provided with axial swirl blades with the same rotation direction and angle; the wastewater feeding port is connected with the wastewater atomizing disk; the outlet of the atomizing disk is arranged at the upper part of the drying tower.
In order to make the flue gas flow more uniform, a plurality of swirl blades are respectively arranged in two flues, the radial swirl blades are arranged in a circumferential array around the outer flue, and the circumferential array angle is 15-30 degrees; the axial swirl blades are arranged around the circumferential array of the inner flue, the circumferential array angle is 15-30 degrees, but the excessive number of the blades can increase the resistance of the flue and the weight of the flue, so that the number of the blades is selected according to actual conditions; in order to change the strength and direction of the swirling flow of the high-temperature flue gas, the included angle between the radial swirling flow blades and the incoming flow direction of the flue gas in the outer flue is 15-75 degrees; the included angle between the axial swirl vane and the axis of the inner flue is 15-75 degrees, the swirl effect is mainly influenced by the angle of the vane, the larger the angle is, the better the swirl effect is, but the larger the angle is, the larger the resistance is, the swirl effect generated by the angle range is tested to meet the production requirement, and different angle combinations of the swirl vanes in two directions can provide more swirl adjustment options.
The outlet of the flue is provided with the flue flaring, the angle of the flue flaring is 15-60 degrees, and the size of the low-pressure backflow area can be adjusted by adjusting the size of the flaring angle.
The flue flaring comprises an inner flue flaring and an outer flue flaring, the flaring length is 0.2-0.6 times of the diameter of the corresponding flue, the outlets of the two flue flaring are flush, the range of a low-pressure backflow area can be enlarged by increasing the flaring length within a certain range, and the mixed evaporation of high-temperature flue gas and waste water is facilitated.
The side surface of the atomizing disk is provided with the atomizing holes, the atomizing holes are arranged in a circumferential array, and the angle of the circumferential array is 15-60 degrees, so that the wastewater is atomized more fully, the liquid drops are uniform, and the wastewater is evaporated after contacting with the flue gas.
In order to adjust the smoke entering quantity of the two flues, the outer flue baffle door and the inner flue baffle door are double-shutter baffle doors, and the double-shutter baffle doors are welded with the flues or are connected by flanges; the blades are connected with the baffle door frame through a rotating shaft, and the rotating shaft is connected through a connecting rod mechanism, so that the blades are synchronously opened or closed, and the areas of low-pressure backflow areas formed by different air inflow of the two flues are different so as to adapt to different wastewater amounts; the double-shutter door can play a good sealing and closing role.
The desulfurization waste water drying method adopting the device comprises the following steps:
S1, high-temperature flue gas extracted from a denitration outlet enters a high-temperature flue gas inlet flue, then enters an outer flue and an inner flue respectively, passes through an outer flue baffle door and an inner flue baffle door, and then passes through a radial swirl vane in the outer flue and an axial swirl vane in the inner flue respectively, and is sprayed out at a flue gas outlet to form rotary flue gas, and a low-pressure backflow area is formed;
S2, the desulfurization wastewater enters an atomizing disc through a wastewater feeding port, the atomizing disc is driven to rotate by a high-speed rotating motor, and the desulfurization wastewater is broken and dispersed into atomized droplets at the edge of the atomizing disc after being sprayed out; the inner flue 5 and the high-speed rotating motor 6 are separated by the heat insulation layer 7, so that the high-speed rotating motor 6 is prevented from being damaged by long-term high-temperature smoke;
S3, mixing the wastewater atomization droplets with the rotating flue gas in a low-pressure backflow area for heat transfer, and fully contacting the rotating flue gas with the wastewater atomization droplets to evaporate the droplets;
S4, evaporating the atomized droplets to dryness, and enabling the water vapor to leave the drying tower along with the flue gas from a flue gas outlet at the lower part of the drying tower; the evaporated solid matter falls into the ash bucket at the bottom of the drying tower partially, and is collected and treated from the ash discharge port.
In order to realize a low-pressure backflow area at the flue outlet, in the step S1, the opening degree of an outer flue baffle door and an inner flue baffle door is adjusted to control the amount of smoke entering an outer flue and an inner flue, so that the area of the low-pressure backflow area is adjusted; the radial swirl vane rotational speed is greater than the axial swirl vane rotational speed.
Because the amount of desulfurization wastewater to be treated is not constant, in the step S3, when the amount of wastewater is large, the area of the reflux zone is increased; and when the waste water amount is smaller, the area of the reflux zone is reduced.
In order to prevent the liquid drop from adhering to the wall surface of the drying tower, in the step S3, the area of the low-pressure backflow area is changed by adjusting the angles of the outer flue baffle door and the radial swirl vanes.
Compared with the prior art, the invention has the following advantages:
the desulfurization waste water drying device and method provided by the invention solve the problems of long process flow, high investment cost and high operation and maintenance cost of the existing desulfurization waste water treatment system, and the technical problems of flue corrosion caused by adopting a flue evaporation technology, large volume and easy wall scaling caused by using a thin high-type drying chamber device, thereby causing potential safety hazard.
By using the drying device, high-temperature flue gas enters the drying tower at a certain speed and a higher rotating speed after passing through the inner flue and the outer flue, and a low-pressure area is formed in a flue gas outlet area due to the high-speed movement of the flue gas; simultaneously, a reflux area is formed in the smoke outlet area due to the effect of smoke rotational flow; due to the existence of the low-pressure reflux zone, the residence time of the flue gas in the reflux zone can be improved, the reaction distance is shortened, and then the waste water droplets are fully contacted with the flue gas to exchange heat and are evaporated to dryness, so that the drying height of the drying tower is effectively reduced, the evaporation rate of the waste water is high, the residue of the droplets is avoided, the problem of flue corrosion is avoided, and the method has higher popularization and application values.
According to the drying device, the angles of the baffle door and the cyclone blades are adjusted, so that the flow speed and the rotation speed of the flue gas in the outer flue are increased or reduced, the area of the low-pressure backflow area can be enlarged or reduced, meanwhile, the atomization holes are additionally formed in the atomizer, the atomization degree of the waste water is increased, the influence of the temperature of the flue gas on the evaporation of the waste water is reduced, and atomized liquid drops are prevented from flying out of the atomization disc and being adhered to the wall surface of the drying tower; the inner flue and the outer flue are matched with the radial and axial swirl blades to adjust the swirl intensity, so that the evaporation efficiency of waste water droplets is improved, the whole device reduces auxiliary devices such as a temperature sensor, various electric valves, a vortex-proof plate and the like, the structure is simple and reasonable, the equipment integration level is high, the process is simple, the operation is convenient, the operation is reliable, and the investment and the operation cost are reduced.
Drawings
FIG. 1 is a schematic diagram of a desulfurization waste water drying apparatus according to the present invention;
FIG. 2 is a schematic view of axial swirl vanes in accordance with the present invention;
FIG. 3 is a schematic view of a radial swirl vane according to the present invention;
FIG. 4 is a schematic view of the structure of the atomizing disk according to the present invention;
FIG. 5 is a schematic view of a double blind door according to the present invention.
Reference numerals:
1-high temperature flue gas inlet, 2-outside flue baffle door, 3-inside flue baffle door, 4-outside flue, 5-inside flue, 6-high speed rotating electrical machine, 7-heat preservation, 8-radial swirl vane baffle, 9-radial swirl vane, 10-waste water feed inlet, 11-atomizing disk, 12-flue gas outlet, 13-ash delivery port, 14-drying tower, 15-low pressure reflux zone, 16-rotating flue gas, 17-atomized droplet, 18-flue flaring, 19-axial swirl vane, 20-axial swirl vane outer cylinder, 21-axial swirl vane inner cylinder, 22-atomization hole, 23-double-shutter baffle door, 24-baffle door frame, 25-vane, 26-link mechanism, 27-rotating shaft, A-flue gas inlet, B-flue gas outlet.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
Example 1 of the present invention: as shown in fig. 1-4, a desulfurization waste water drying device comprises a high-temperature flue gas inlet flue 1, an outer flue baffle door 2, an inner flue baffle door 3, an outer flue 4, an inner flue 5, radial swirl vanes 9, a waste water feeding port 10, an atomizing disk 11, a drying tower 14 and axial swirl vanes 19; the high-temperature flue gas inlet flue 1 is communicated with an outer flue 4 and an inner flue 5, the outer flue 4 is connected with an outer flue baffle door 2, and the inner flue 5 is connected with an inner flue baffle door 3; the inside of the outer flue 4 is provided with radial swirl blades 9 with the same rotation direction and angle, and the inside of the inner flue 5 is provided with axial swirl blades 19 with the same rotation direction and angle; in order to make the flue gas flow more uniform, a plurality of swirl blades are respectively arranged in the two flues, the radial swirl blades 9 are arranged in a circumferential array around the outer flue 4, and the circumferential array angle is 15 degrees; the axial swirl vanes 19 are arranged in a circumferential array around the inner flue 5, and the circumferential array angle is 30 degrees; in order to change the strength and direction of the swirling flow of the high-temperature flue gas, the included angle between the radial swirling flow vane 9 and the incoming flow direction of the flue gas in the outer flue 4 is 15 degrees; the included angle between the axial swirl blades 19 and the axis of the inner flue 5 is 75 degrees, and the combination of different angles of the swirl blades in two directions can provide more swirl adjustment options; the flue outlet is provided with a flue flaring 18, and the angle of the flue flaring is 15 degrees; the flue flaring 18 comprises an inner flue 5 flaring and an outer flue 4 flaring, the length of the inner flue 5 flaring is 0.2 times of the diameter of the corresponding flue, the length of the outer flue 4 flaring is 0.6 times of the diameter of the corresponding flue, and the outlets of the two flue flaring are flush; the wastewater feeding port 10 is connected with a wastewater atomizing disk 11; the outlet of the atomizing disk 11 is arranged at the upper part of the drying tower 14; in order to enable the atomization of the wastewater to be more sufficient and facilitate the evaporation of the wastewater, the side surface of the atomizing disk 11 is provided with atomizing holes 22, the atomizing holes 22 are arranged in a circumferential array, and the circumferential array angle is 15 degrees; the outer side flue baffle door 2 and the inner side flue baffle door 3 are double-shutter baffle doors 23, and the double-shutter baffle doors 23 are welded with the flue or connected with the flue by adopting flanges; the blades 25 are connected with the baffle door frame 24 through a rotating shaft 27, the rotating shaft 27 is connected by a connecting rod mechanism 26, the blades 25 are synchronously opened or closed, and the opening degrees of the blades of the outer side flue baffle door 2 and the inner side flue baffle door 3 are adjusted so as to adjust the inlet amount of high-temperature flue gas of the inner side flue and the outer side flue.
The desulfurization waste water drying method adopting the device comprises the following steps:
s1, high-temperature flue gas extracted from a denitration outlet enters a high-temperature flue gas inlet flue 1 at the temperature range of (280-450), then enters an outer flue 4 and an inner flue 5 respectively, the gas quantity entering the outer flue 4 and the inner flue 5 is controlled by adjusting the opening degree of blades of an outer flue baffle door 2 and an inner flue baffle door 3, when the total gas quantity is unchanged, the area of a backflow area can be enlarged by adjusting the outer flue baffle door 2, adjusting the inner flue baffle door 3 or not adjusting the total gas quantity; the area of the reflux area can be reduced when the outer side flue baffle door 2 is regulated down and the inner side flue baffle door 3 is regulated up or not regulated down; the rotation speed of the radial swirl vane 9 is greater than that of the axial swirl vane 19, and the smoke passes through the swirling action of the inner flue and the outer flue, so that the outlet smoke has a larger rotation action, and meanwhile, the flow velocity of the smoke at the outlet is relatively higher, so that the smoke 16 which is rotated is sprayed out at the smoke outlet, and a low-pressure backflow area 15 is formed;
S2, the desulfurization wastewater enters an atomization disc 11 through a wastewater feeding port 10, the atomization disc 11 is driven to rotate by a high-speed rotating motor 6, the desulfurization wastewater is stretched into a film or pulled into filaments after being sprayed out, and the edges of the atomization disc 11 are broken and dispersed into atomized droplets 17; the inner flue 5 and the high-speed rotating motor 6 are separated by the heat insulation layer 7, so that the high-speed rotating motor 6 is prevented from being damaged by long-term high-temperature smoke;
S3, mixing the wastewater atomization droplets 17 with the rotating smoke 16 in a low-pressure backflow area 15, and conducting heat transfer, wherein the rotating smoke 16 is fully contacted with the wastewater atomization droplets 17, so that the droplets are evaporated; because the amount of desulfurization waste water to be treated is not constant, when the amount of waste water is large, the area of the low-pressure backflow area 15 is regulated to ensure that the atomized waste water droplets 17 fully exchange heat; when the waste water amount is small, the area of the low-pressure backflow area 15 is reduced; in order to prevent the droplets from being adhered to the wall surface of the drying tower 14, the angles of the baffle door 2 of the outer flue and the radial swirl vanes 9 can be adjusted to increase the flow speed and the rotation speed of the flue gas in the outer flue 4, further enlarge the area of the low-pressure backflow area 15 and enable the atomized droplets 17 to be included in the low-pressure backflow area 15;
S4, evaporating the atomized droplets 17 to dryness, and enabling water vapor to leave the drying tower 14 along with the flue gas from a flue gas outlet 12 at the lower part of the drying tower 14; the evaporated solid matter falls partly into the ash bucket at the bottom of the drying tower 14 and is collected and treated from the ash discharge opening 13.
Example 2: as shown in fig. 1, the desulfurization waste water drying device comprises a high-temperature flue gas inlet flue 1, an outer flue baffle door 2, an inner flue baffle door 3, an outer flue 4, an inner flue 5, radial swirl vanes 9, a waste water feeding port 10, an atomizing disk 11, a drying tower 14 and axial swirl vanes 19; the high-temperature flue gas inlet flue 1 is communicated with an outer flue 4 and an inner flue 5, an outer flue baffle door 2 and radial swirl blades 9 with the same rotation direction and angle are arranged in the outer flue 4, and an inner flue baffle door 3 and axial swirl blades 19 with the same rotation direction and angle are arranged in the inner flue 5; the wastewater feeding port 10 is connected with a wastewater atomizing disk 11; the outlet of the atomizing disk 11 is at the upper part of the drying tower 14.
Example 3: as shown in fig. 1-4, a desulfurization waste water drying device comprises a high-temperature flue gas inlet flue 1, an outer flue baffle door 2, an inner flue baffle door 3, an outer flue 4, an inner flue 5, radial swirl vanes 9, a waste water feeding port 10, an atomizing disk 11, a drying tower 14 and axial swirl vanes 19; the high-temperature flue gas inlet flue 1 is communicated with an outer flue 4 and an inner flue 5, the outer flue 4 is connected with an outer flue baffle door 2, and the inner flue 5 is connected with an inner flue baffle door 3; the inside of the outer flue 4 is provided with radial swirl blades 9 with the same rotation direction and angle, and the inside of the inner flue 5 is provided with axial swirl blades 19 with the same rotation direction and angle; in order to make the flue gas flow more uniform, a plurality of swirl blades are respectively arranged in the two flues, the radial swirl blades 9 are arranged in a circumferential array around the outer flue 4, and the circumferential array angle is 20 degrees; the axial swirl vanes 19 are arranged in a circumferential array around the inner flue 5, the circumferential array angle being 15 °; in order to change the strength and direction of the swirling flow of the high-temperature flue gas, the included angle between the radial swirling flow vane 9 and the incoming flow direction of the flue gas in the outer flue 4 is 75 degrees; the included angle between the axial swirl blades 19 and the axis of the inner flue 5 is 15 degrees, and the combination of different angles of the swirl blades in two directions can provide more swirl adjustment options; the flue outlet is provided with a flue flaring 18, and the angle of the flue flaring is 60 degrees; the flue flaring 18 comprises an inner flue 5 flaring and an outer flue 4 flaring, the length of the inner flue 5 flaring is 0.6 times of the diameter of the corresponding flue, the length of the outer flue 4 flaring is 0.2 times of the diameter of the corresponding flue, and the outlets of the two flue flaring are flush; the wastewater feeding port 10 is connected with a wastewater atomizing disk 11; the outlet of the atomizing disk 11 is arranged at the upper part of the drying tower 14; in order to enable the atomization of the wastewater to be more sufficient and facilitate the evaporation of the wastewater, the side surface of the atomizing disk 11 is provided with atomizing holes 22, the atomizing holes 22 are arranged in a circumferential array, and the circumferential array angle is 60 degrees; the outer side flue baffle door 2 and the inner side flue baffle door 3 are double-shutter baffle doors 23, and the double-shutter baffle doors 23 are welded with the flue or connected with the flue by adopting flanges; the blades 25 are connected with the baffle door frame 24 through a rotating shaft 27, the rotating shaft 27 is connected by a connecting rod mechanism 26, the blades 25 are synchronously opened or closed, and the opening degrees of the blades of the outer side flue baffle door 2 and the inner side flue baffle door 3 are adjusted so as to adjust the inlet amount of high-temperature flue gas of the inner side flue and the outer side flue.
Example 4: as shown in fig. 1-3, a desulfurization waste water drying device comprises a high-temperature flue gas inlet flue 1, an outer flue baffle door 2, an inner flue baffle door 3, an outer flue 4, an inner flue 5, radial swirl vanes 9, a waste water feeding port 10, an atomizing disk 11, a drying tower 14 and axial swirl vanes 19; the high-temperature flue gas inlet flue 1 is communicated with an outer flue 4 and an inner flue 5, the outer flue 4 is connected with an outer flue baffle door 2, and the inner flue 5 is connected with an inner flue baffle door 3; the inside of the outer flue 4 is provided with radial swirl blades 9 with the same rotation direction and angle, and the inside of the inner flue 5 is provided with axial swirl blades 19 with the same rotation direction and angle; the wastewater feeding port 10 is connected with a wastewater atomizing disk 11; the outlet of the atomizing disk 11 is arranged at the upper part of the drying tower 14; the opening degrees of the blades of the outer side flue baffle door 2 and the inner side flue baffle door 3 are adjusted to adjust the inlet amount of high-temperature flue gas of the inner side flue and the outer side flue; in order to make the flue gas flow more uniform, a plurality of swirl blades are respectively arranged in two flues, the radial swirl blades 9 are arranged in a circumferential array around the outer flue 4, and the circumferential array angle is 30 degrees; the axial swirl vanes 19 are arranged in a circumferential array around the inner flue 5, the circumferential array angle being 20 °; in order to change the strength and direction of the swirling flow of the high-temperature flue gas, the included angle between the radial swirling flow vane 9 and the incoming flow direction of the flue gas in the outer flue 4 is 45 degrees; the included angle between the axial swirl blades 19 and the axis of the inner flue 5 is 45 degrees, and the combination of different angles of the swirl blades in two directions can provide more swirl adjustment options; the flue outlet is provided with a flue flaring 18, and the angle of the flue flaring is 40 degrees; the flue flaring 18 comprises an inner flue 5 flaring and an outer flue 4 flaring, the length of the inner flue 5 flaring is 0.4 times of the diameter of the corresponding flue, the length of the outer flue 4 flaring is 0.5 times of the diameter of the corresponding flue, and the outlets of the two flue flaring are flush.
Example 5: as shown in fig. 1 and 4, a desulfurization waste water drying device comprises a high-temperature flue gas inlet flue 1, an outer flue baffle door 2, an inner flue baffle door 3, an outer flue 4, an inner flue 5, radial swirl vanes 9, a waste water feeding port 10, an atomizing disk 11, a drying tower 14 and axial swirl vanes 19; the high-temperature flue gas inlet flue 1 is communicated with an outer flue 4 and an inner flue 5, the outer flue 4 is connected with an outer flue baffle door 2, and the inner flue 5 is connected with an inner flue baffle door 3; the inside of the outer flue 4 is provided with radial swirl blades 9 with the same rotation direction and angle, and the inside of the inner flue 5 is provided with axial swirl blades 19 with the same rotation direction and angle; the wastewater feeding port 10 is connected with a wastewater atomizing disk 11; the outlet of the atomizing disk 11 is arranged at the upper part of the drying tower 14; in order to enable the atomization of the wastewater to be more sufficient and facilitate the evaporation of the wastewater, the side surface of the atomizing disk 11 is provided with atomizing holes 22, the atomizing holes 22 are arranged in a circumferential array, and the circumferential array angle is 20 degrees; the outer side flue baffle door 2 and the inner side flue baffle door 3 are double-shutter baffle doors 23, and the double-shutter baffle doors 23 are welded with the flue or connected with the flue by adopting flanges; the blades 25 are connected with the baffle door frame 24 through a rotating shaft 27, the rotating shaft 27 is connected by a connecting rod mechanism 26, the blades 25 are synchronously opened or closed, and the opening degrees of the blades of the outer side flue baffle door 2 and the inner side flue baffle door 3 are adjusted so as to adjust the inlet amount of high-temperature flue gas of the inner side flue and the outer side flue.
Example 6: a desulfurization waste water drying method comprises the following steps:
s1, high-temperature flue gas extracted from a denitration outlet enters a high-temperature flue gas inlet flue 1 at the temperature range of (280-450), then enters an outer flue 4 and an inner flue 5 respectively, the gas quantity entering the outer flue 4 and the inner flue 5 is controlled by adjusting the opening degree of blades of an outer flue baffle door 2 and an inner flue baffle door 3, when the total gas quantity is unchanged, the area of a backflow area can be enlarged by adjusting the outer flue baffle door 2, adjusting the inner flue baffle door 3 or not adjusting the total gas quantity; the area of the reflux area can be reduced when the outer side flue baffle door 2 is regulated down and the inner side flue baffle door 3 is regulated up or not regulated down; the rotation speed of the radial swirl vane 9 is greater than that of the axial swirl vane 19, and the smoke passes through the swirling action of the inner flue and the outer flue, so that the outlet smoke has a larger rotation action, and meanwhile, the flow velocity of the smoke at the outlet is relatively higher, so that the smoke 16 which is rotated is sprayed out at the smoke outlet, and a low-pressure backflow area 15 is formed;
S2, the desulfurization wastewater enters an atomization disc 11 through a wastewater feeding port 10, the atomization disc 11 is driven to rotate by a high-speed rotating motor 6, the desulfurization wastewater is stretched into a film or pulled into filaments after being sprayed out, and the edges of the atomization disc 11 are broken and dispersed into atomized droplets 17; the inner flue 5 and the high-speed rotating motor 6 are separated by the heat insulation layer 7, so that the high-speed rotating motor 6 is prevented from being damaged by long-term high-temperature smoke;
S3, mixing the wastewater atomization droplets 17 with the rotating smoke 16 in a low-pressure backflow area 15, and conducting heat transfer, wherein the rotating smoke 16 is fully contacted with the wastewater atomization droplets 17, so that the droplets are evaporated;
S4, evaporating the atomized droplets 17 to dryness, and enabling water vapor to leave the drying tower 14 along with the flue gas from a flue gas outlet 12 at the lower part of the drying tower 14; the evaporated solid matter falls partly into the ash bucket at the bottom of the drying tower 14 and is collected and treated from the ash discharge opening 13.
Example 7: a desulfurization waste water drying method comprises the following steps:
S1, high-temperature flue gas extracted from a denitration outlet enters a high-temperature flue gas inlet flue 1 at the temperature range of (280-450) DEG C, then enters an outer flue 4 and an inner flue 5 respectively, passes through an outer flue baffle door 2 and an inner flue baffle door 3, passes through a radial swirl vane 9 in the outer flue 4 and a axial swirl vane 19 in the inner flue 5 respectively, and is sprayed out as rotating flue gas 16 at the flue gas outlet, and simultaneously forms a low-pressure backflow zone 15;
S2, the desulfurization wastewater enters an atomization disc 11 through a wastewater feeding port 10, the atomization disc 11 is driven to rotate by a high-speed rotating motor 6, the desulfurization wastewater is stretched into a film or pulled into filaments after being sprayed out, and the edges of the atomization disc 11 are broken and dispersed into atomized droplets 17; the inner flue 5 and the high-speed rotating motor 6 are separated by the heat insulation layer 7, so that the high-speed rotating motor 6 is prevented from being damaged by long-term high-temperature smoke;
S3, mixing the wastewater atomization droplets 17 with the rotating smoke 16 in a low-pressure backflow area 15, and conducting heat transfer, wherein the rotating smoke 16 is fully contacted with the wastewater atomization droplets 17, so that the droplets are evaporated; in order to prevent the droplets from being adhered to the wall surface of the drying tower 14, the angles of the baffle door 2 of the outer flue and the radial swirl vanes 9 can be adjusted to increase the flow speed and the rotation speed of the flue gas in the outer flue 4, further enlarge the area of the low-pressure backflow area 15 and enable the atomized droplets 17 to be included in the low-pressure backflow area 15;
S4, evaporating the atomized droplets 17 to dryness, and enabling water vapor to leave the drying tower 14 along with the flue gas from a flue gas outlet 12 at the lower part of the drying tower 14; the evaporated solid matter falls partly into the ash bucket at the bottom of the drying tower 14 and is collected and treated from the ash discharge opening 13.
The working principle of the invention is illustrated by example 1:
As shown in fig. 1-4, high-temperature flue gas enters the high-temperature flue gas inlet flue 1 and enters the drying device through an outer flue 4 and an inner flue 5; the inside of the outer flue 4 is provided with an outer flue baffle door 2 and radial swirl vanes 9 with the same rotation direction and angle, and the inside of the inner flue 5 is provided with an inner flue baffle door 3 and axial swirl vanes 19 with the same rotation direction and angle; the outer side flue baffle door 2 and the inner side flue baffle door 3 are double-shutter baffle doors 23, and the double-shutter baffle doors 23 are welded with the flue or connected by adopting flanges; the blades 25 are connected with the baffle door frame 24 through a rotating shaft 27, the rotating shaft 27 is connected through a connecting rod mechanism 26, so that the blades 25 are synchronously opened or closed, the opening degrees of the blades of the outer side flue baffle door 2 and the inner side flue baffle door 3 are adjusted, and the inlet amount of high-temperature flue gas of the inner side flue and the outer side flue can be adjusted; in order to make the flue gas flow more uniform, a plurality of swirl blades are respectively arranged in two flues, but the excessive number of the blades can increase the resistance of the flues and the weight of the flues, so that the number of the blades is selected according to actual conditions; in order to change the intensity and direction of the swirling flow of the high-temperature flue gas, the included angle between the radial swirling flow vane 9 and the incoming flow direction of the flue gas in the outer flue 4 can be adjusted; the included angle between the axial swirl blades 19 and the axis of the inner flue 5 can be adjusted, the swirl effect is mainly influenced by the angle of the blades, the larger the angle is, the better the swirl effect is, but the larger the angle is and the larger the resistance is, so the angle of the blades is selected according to actual conditions; the outlets of the inner side flue 5 and the outer side flue 4 are provided with flue flaring 18, the flaring angle of the flue flaring 18 is adjustable, the size of the low-pressure backflow area is adjusted by adjusting the angle of the flaring, the flue flaring 18 comprises the flaring of the inner side flue 5 and the flaring of the outer side flue 4, the flaring length is 0.2-0.6 times of the diameter of the corresponding flue, the outlets of the two flue flaring are flush, the range of the low-pressure backflow area can be enlarged by increasing the flaring length within a certain range, and the mixed evaporation of high-temperature flue gas and waste water is facilitated; the flue gas passes through the swirling action of the inner flue and the outer flue, so that the outlet flue gas has a larger swirling action, and the flow velocity of the flue gas at the outlet is relatively higher, so that the flue gas 16 is sprayed out at the flue gas outlet to rotate, and a low-pressure backflow area 15 is formed. When the total smoke amount is unchanged, the outer side flue baffle door 2 is regulated, the inner side flue baffle door 3 is regulated or not regulated, the area of the low-pressure backflow area 15 can be enlarged; the area of the low pressure recirculation zone 15 can be reduced when the outside flue damper door 2 is reduced, the inside flue damper door 3 is enlarged or not.
The desulfurization waste water enters the waste water atomizing disk 11 through the waste water feeding port 10, is stretched into a film or pulled into filaments after being sprayed out through the high-speed rotating atomizing disk 11, and is broken and dispersed into atomized droplets 17 at the edge of the atomizing disk 11. The atomized droplets 17 transfer heat with the rotating high-temperature flue gas 16, and due to the low-pressure backflow area 15, the residence time of the high-temperature flue gas 16 in the low-pressure backflow area 15 can be prolonged, and then the atomized droplets 17 can be fully contacted with the wastewater and evaporated to dryness. If atomized droplets 17 are sprayed out and then adhered to the wall surface of the drying tower 14, the angles of the outer flue baffle door 2 and the radial swirl vanes 9 of the outer flue 4 can be properly adjusted to enhance the flow speed and the rotation speed of the flue gas in the outer flue 4, so that the area of the low-pressure backflow area 15 is enlarged, and the atomized droplets 17 are positioned in the backflow area.
After the atomized droplets 17 are evaporated to dryness, water vapor leaves the drying tower along with the flue gas from a flue gas outlet 12 at the lower part of the drying tower 14, enters an inlet flue in front of the electric dust collector, and solid matters in the atomized droplets 17 are evaporated to dryness to become fly ash and salt impurities, part of the solid impurities are carried away by the flue gas, and the rest of the solid impurities fall into an ash bucket at the bottom of the drying tower 14 and are periodically collected and treated from an ash discharge port 13.
The device provided by the invention is used for drying desulfurization wastewater, so that the residence time of high-temperature flue gas in the low-pressure reflux zone 15 is effectively improved, the heat exchange distance between the flue gas and liquid drops is shortened, and further, the atomized liquid drops 17 of the wastewater are fully contacted with the flue gas for heat exchange and evaporated to dryness, and the drying height of the drying tower 14 is effectively reduced.
Claims (10)
1. The desulfurization waste water drying device is characterized by comprising a high-temperature flue gas inlet flue (1), an outer flue baffle door (2), an inner flue baffle door (3), an outer flue (4), an inner flue (5), radial swirl vanes (9), a waste water feeding port (10), an atomizing disk (11), a drying tower (14) and axial swirl vanes (19); the high-temperature flue gas inlet flue (1) is communicated with the outer flue (4) and the inner flue (5), the outer flue (4) is connected with the outer flue baffle door (2), and the inner flue (5) is connected with the inner flue baffle door (3); radial swirl blades (9) with the same rotation direction and angle are arranged in the outer flue (4), and axial swirl blades (19) with the same rotation direction and angle are arranged in the inner flue (5); the wastewater feeding port (10) is connected with a wastewater atomizing disk (11); the outlet of the atomizing disk (11) is arranged at the upper part of the drying tower (14).
2. The desulfurization wastewater drying apparatus according to claim 1, characterized in that: the radial swirl vanes (9) are arranged around the circumferential array of the outer flue (4), and the circumferential array angle is 15-30 degrees; the axial swirl vanes (19) are arranged around the inner flue (5) in a circumferential array, and the circumferential array angle is 15-30 degrees; the included angle between the radial swirl blades (9) and the incoming flow direction of the flue gas in the outer flue (4) is 15-75 degrees; the included angle between the axial swirl blades (19) and the axis of the inner flue (5) is 15-75 degrees.
3. The desulfurization wastewater drying apparatus according to claim 1, characterized in that: the outlets of the inner flue (5) and the outer flue (4) are provided with flue flaring (18), and the angle of the flue flaring is 15-60 degrees.
4. A desulfurization waste water drying apparatus according to claim 3, wherein: the flue flaring (18) comprises an inner flue (5) flaring and an outer flue (4) flaring, the flaring length is 0.2-0.6 times of the diameter of the corresponding flue, and the outlets of the two flues flaring are flush.
5. The desulfurization wastewater drying apparatus according to claim 1, characterized in that: the side of the atomizing disk (11) is provided with atomizing holes (22), the atomizing holes (22) are arranged in a circumferential array, and the angle of the circumferential array is 15-60 degrees.
6. The desulfurization wastewater drying apparatus according to claim 1, characterized in that: the outer side flue baffle door (2) and the inner side flue baffle door (3) are double-shutter baffle doors (23), and the double-shutter baffle doors (23) are welded with the flue or connected by adopting flanges; the blades (25) are connected with the baffle door frame (24) through rotating shafts (27), and the rotating shafts (27) are connected through a connecting rod mechanism (26).
7. A method for drying desulfurization waste water using the apparatus as claimed in any one of claims 1 to 6, characterized by comprising the steps of:
s1, high-temperature flue gas extracted from a denitration outlet enters a high-temperature flue gas inlet flue (1), then enters an outer flue gas inlet flue (4) and an inner flue gas inlet flue (5) respectively, passes through an outer flue gas baffle door (2) and an inner flue gas baffle door (3), passes through a radial swirl vane (9) in the outer flue gas inlet flue (4) and an axial swirl vane (19) in the inner flue gas inlet flue (5) respectively, and is sprayed out as rotating flue gas (16) at a flue gas outlet, and meanwhile, a low-pressure backflow area (15) is formed;
s2, the desulfurization wastewater enters an atomizing disc (11) through a wastewater feeding port (10), the atomizing disc (11) is driven to rotate by a high-speed rotating motor (6), and after being sprayed out, the desulfurization wastewater is broken and dispersed into atomized droplets (17) at the edge of the atomizing disc (11);
s3, mixing the wastewater atomization droplets (17) with the rotating smoke (16) in a low-pressure backflow area (15) to transfer heat, wherein the rotating smoke (16) is fully contacted with the wastewater atomization droplets (17) so that the droplets are evaporated;
S4, evaporating the atomized droplets (17) to dryness, and enabling water vapor to leave the drying tower (14) along with the flue gas from a flue gas outlet (12) at the lower part of the drying tower (14); the evaporated solid matter falls into the ash bucket at the bottom of the drying tower (14) partially, and is collected and treated from the ash discharge port (13).
8. The desulfurization wastewater drying method according to claim 7, characterized in that: in the step S1, the opening degree of the outer flue baffle door (2) and the opening degree of the inner flue baffle door (3) are adjusted to control the amount of smoke entering the outer flue (4) and the inner flue (5), so that the area of the low-pressure backflow area (15) is adjusted; the rotation speed of the radial swirl blades (9) is greater than that of the axial swirl blades (19).
9. The desulfurization wastewater drying method according to claim 7, characterized in that: in the step S3, when the wastewater amount is large, the area of a reflux zone is enlarged; and when the waste water amount is smaller, the area of the reflux zone is reduced.
10. The desulfurization wastewater drying method according to claim 7, characterized in that: in the step S3, the area of the low-pressure backflow zone (15) is changed by adjusting the angles of the outer flue baffle door (2) and the radial swirl vanes (9).
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