阅读说明：本技术 一种脱硫废水干燥装置及方法 (Desulfurization wastewater drying device and method ) 是由 张锡乾 王建强 王浩宇 耿宣 杨彭飞 胡小夫 吴冲 王凯亮 张起 王桦 于 2019-11-03 设计创作，主要内容包括：本发明涉及一种脱硫废水干燥装置,包括高温烟气入口烟道、外侧烟道挡板门、内侧烟道挡板门、外侧烟道、内侧烟道、径向旋流叶片、废水给料口、雾化盘、干燥塔和轴向旋流叶片；所述高温烟气入口烟道与外侧烟道和内侧烟道相连通,外侧烟道与外侧烟道挡板门相连,内侧烟道与内侧烟道挡板门相连；所述外侧烟道内部设有旋向和角度相同的径向旋流叶片,所述内侧烟道内部设有旋向和角度相同的轴向旋流叶片；所述废水给料口与废水雾化盘相连；所述雾化盘出口在干燥塔上部；同时还公开了脱硫废水干燥方法。本发明装置结构合理、集成度高、废水干燥充分、降低了腐蚀隐患,具有投资成本低、处理量宽、调节灵活、运行稳定、不需添加任何化学药品等优势。(The invention relates to a desulfurization wastewater drying device, which comprises a high-temperature flue gas inlet flue, an outer side flue damper, an inner side flue damper, an outer side flue, an inner side flue, a radial rotational flow blade, a wastewater feed inlet, an atomizing disc, a drying tower and an axial rotational flow blade, wherein the high-temperature flue gas inlet flue is connected with the outer side flue damper; the high-temperature flue gas inlet flue is communicated with the outer side flue and the inner side flue, the outer side flue is connected with the outer side flue damper, and the inner side flue is connected with the inner side flue damper; radial rotational flow blades with the same rotation direction and angle are arranged inside the outer side flue, and axial rotational flow blades with the same rotation direction and angle are arranged inside the inner side flue; the wastewater feeding port is connected with a wastewater atomizing disc; the outlet of the atomizing disc is arranged at the upper part of the drying tower; also discloses a method for drying the desulfurization wastewater. The device has the advantages of reasonable structure, high integration level, full wastewater drying, reduction of corrosion hidden danger, low investment cost, wide treatment capacity, flexible adjustment, stable operation, no need of adding any chemical and the like.)

1. A desulfurization waste water drying device is characterized by comprising a high-temperature flue gas inlet flue (1), an outer side flue damper (2), an inner side flue damper (3), an outer side flue (4), an inner side flue (5), radial swirl blades (9), a waste water feeding port (10), an atomizing disc (11), a drying tower (14) and axial swirl blades (19); the high-temperature flue gas inlet flue (1) is communicated with an outer side flue (4) and an inner side flue (5), the outer side flue (4) is connected with an outer side flue baffle door (2), and the inner side flue (5) is connected with an inner side flue baffle door (3); radial swirl blades (9) with the same rotation direction and angle are arranged in the outer side flue (4), and axial swirl blades (19) with the same rotation direction and angle are arranged in the inner side flue (5); the wastewater feeding port (10) is connected with a wastewater atomizing disc (11); the outlet of the atomizing disc (11) is arranged at the upper part of the drying tower (14).

2. The desulfurization waste water drying apparatus according to claim 1, characterized in that: the radial rotational flow blades (9) are arranged around the outer side flue (4) in a circumferential array, and the circumferential array angle is 15-30 degrees; the axial swirl blades (19) are arranged in a circumferential array around the inner side flue (5), and the circumferential array angle is 15-30 degrees; the included angle between the radial rotational flow blade (9) and the incoming flow direction of the flue gas in the outer side flue (4) is 15-75 degrees; the included angle between the axial rotational flow blade (19) and the axis of the inner side flue (5) is 15-75 degrees.

3. The desulfurization waste water drying apparatus according to claim 1, characterized in that: the outlets of the inner side flue (5) and the outer side flue (4) are provided with flue flaring holes (18), and the angle of the flue flaring holes is 15-60 degrees.

4. The desulfurization waste water drying apparatus according to claim 3, characterized in that: the flue flaring (18) comprises a flaring of the inner flue (5) and a flaring of the outer flue (4), the flaring length is 0.2-0.6 times of the diameter of the corresponding flue, and the flaring outlets of the two flues are flush.

5. The desulfurization waste water drying apparatus according to claim 1, characterized in that: the lateral surface 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 waste water drying apparatus according to claim 1, characterized in that: the outer side flue damper (2) and the inner side flue damper (3) are double-shutter dampers (23), and the double-shutter dampers (23) are welded with the flue or connected with the flue by flanges; the blades (25) are connected to the flapper door frame (24) by a shaft (27), the shaft (27) being connected by a linkage (26).

7. The method for drying desulfurization waste water using the apparatus according to 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 respectively enters an outer side flue (4) and an inner side flue (5), passes through an outer side flue damper (2) and an inner side flue damper (3), respectively passes through a radial swirl vane (9) in the outer side flue (4) and an axial swirl vane (19) in the inner side flue (5), is sprayed out at a flue gas outlet to form rotary flue gas (16), and simultaneously forms a low-pressure backflow zone (15);

s2 desulfurization waste water enters an atomizing disc (11) through a waste water feeding port (10), the atomizing disc (11) is driven to rotate by a high-speed rotating motor (6), and the desulfurization waste water is sprayed out and then is broken and dispersed into atomized small droplets (17) on the edge of the atomizing disc (11);

s3, mixing the wastewater atomization droplets (17) with the rotating flue gas (16) in a low-pressure backflow area (15) for heat transfer, and fully contacting the rotating flue gas (16) with the wastewater atomization droplets (17) to evaporate the droplets to dryness;

s4, after the atomized small droplets (17) are evaporated to dryness, the water vapor leaves the drying tower (14) from a flue gas outlet (12) at the lower part of the drying tower (14) along with the flue gas; the dried solid matter partially falls into an ash bucket at the bottom of the drying tower (14) and is collected and processed from an ash discharge port (13).

8. The desulfurization waste water drying method according to claim 7, characterized in that: in the step S1, the amount of flue gas entering the outer side flue (4) and the inner side flue (5) is controlled by adjusting the opening degree of the outer side flue damper (2) and the inner side flue damper (3), and the area of the low-pressure return area (15) is further adjusted; the rotational speed of the radial swirl blades (9) is greater than the rotational speed of the axial swirl blades (19).

9. The desulfurization waste water drying method according to claim 7, characterized in that: in the step S3, when the waste water amount is large, the area of the reflux area is increased; when the amount of waste water is small, the area of the reflux zone is reduced.

10. The desulfurization waste water drying method according to claim 7, characterized in that: in the step S3, the area of the low-pressure recirculation zone (15) is changed by adjusting the angles of the outer flue damper (2) and the radial swirl vanes (9).

Technical Field

The invention relates to the technical field of desulfurization wastewater treatment of thermal power plants, in particular to a desulfurization wastewater drying device and method.

Background

At present, most of domestic wet desulphurization wastewater treatment systems of thermal power plants adopt the traditional triple box process, but the overall operation rate is very low. Cl in the desulfurization wastewater treated by the conventional treatment system^-The concentration is high and cannot be removed. Due to high concentration of Cl^-Resulting in the failure of recycling the treated wastewater. In consideration of environmental requirements and economic benefits, the realization of zero discharge of wastewater by adopting advanced treatment technology is a necessary trend of wastewater treatment. At present, the domestic existing desulfurization wastewater zero-discharge technology comprises evaporative crystallization, flue direct injection and the like, wherein the investment and the operating cost of the evaporative crystallization technology are high, the flue direct injection technology also has certain limitation, if the desulfurization wastewater discharge amount is large, wastewater is directly injected into a flue and can face the situation that liquid drops can not be completely evaporated to dryness, and residual liquid drops directly enter a flue dust removal system, so that the temperature of flue gas of a main flue is lower than the acid dew point, and the dust remover, downstream equipment and the like are causedCorrosion and potential safety hazards. Spray drying is a common way to dry desulfurized wastewater. Drying media (hot air or flue gas and the like) are introduced into a drying chamber, desulfurization wastewater is atomized into wastewater fog drops by an atomization spray gun and sprayed into the drying chamber, and the wastewater fog drops are contacted with the drying media in the drying chamber to be dried to form salt particles. As disclosed in application No. 201811315095.0, the height of the drying chamber is three times or more the diameter thereof, the evaporation distance is long, the diameter is small, and there are disadvantages that the wall surface is easily scaled and the drying is insufficient because the mist of the desulfurization waste water collides with the inner wall surface of the drying chamber.

Disclosure of Invention

The invention aims to provide a desulfurization wastewater drying device and a desulfurization wastewater drying method, which are used for solving the problems of long process flow, high investment cost and high operation and maintenance cost of the conventional desulfurization wastewater treatment system and the technical problems of flue corrosion, large volume of a thin and high drying chamber device and easy scaling of the wall surface, which are caused by the adoption of a flue evaporation technology, so that potential safety hazards are caused.

In order to achieve the purpose, the invention adopts the following technical scheme:

a desulfurization waste water drying device comprises a high-temperature flue gas inlet flue, an outer side flue damper, an inner side flue damper, an outer side flue, an inner side flue, radial rotational flow blades, a waste water feeding port, an atomizing disc, a drying tower and axial rotational flow blades; the high-temperature flue gas inlet flue is communicated with the outer side flue and the inner side flue, the outer side flue is connected with the outer side flue damper, and the inner side flue is connected with the inner side flue damper; radial rotational flow blades with the same rotation direction and angle are arranged inside the outer side flue, and axial rotational flow blades with the same rotation direction and angle are arranged inside the inner side flue; the wastewater feeding port is connected with a wastewater atomizing disc; the outlet of the atomizing disk is arranged at the upper part of the drying tower.

In order to make the smoke flow more uniform, a plurality of cyclone blades are respectively arranged in two flues, the radial cyclone blades are arranged around the periphery of the outer flue in an array manner, and the peripheral array angle is 15-30 degrees; the axial swirl blades are circumferentially arrayed around the inner side flue, the circumferential array angle is 15-30 degrees, but the flue resistance and the weight of the flue are increased due to the excessive number of the blades, so that the number of the blades is selected according to the actual condition; in order to change the strength and the direction of the high-temperature flue gas rotational flow, the included angle between the radial rotational flow blade and the incoming flow direction of the flue gas in the outer side flue is 15-75 degrees; the included angle between the axial swirl blades and the axis of the inner side flue ranges from 15 degrees to 75 degrees, 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, the larger the resistance is, the swirl effect generated in the angle range meets the production requirements through tests, and different angle combinations of the swirl blades in two directions can provide more swirl adjustment options.

The outlet of the flue is provided with a flue flaring, the angle of the flue flaring is 15-60 degrees, and the size of the low-pressure return region can be adjusted by adjusting the flaring angle.

The flaring of the flue comprises flaring of the inner side flue and flaring of the outer side flue, the length of the flaring is 0.2-0.6 times of the diameter of the corresponding flue, the flaring of the two flues is flush with the outlet of the flaring, the flaring length is increased within a certain range, the range of a low-pressure backflow area can be enlarged, and the flaring is beneficial to the mixed evaporation of high-temperature flue gas and waste water.

The side surface of the atomizing disk is provided with atomizing holes, the atomizing holes are arranged in a circumferential array, and the circumferential array angle is 15-60 degrees, so that the waste water is more fully atomized, liquid drops are uniform, and the waste water is favorably dried by distillation after being contacted with flue gas.

In order to adjust the flue gas inlet amount 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 connected by flanges; the blades are connected with the baffle door frame through a rotating shaft, 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 regions formed by different air inflow of the two flues are different, so as to adapt to different waste water volumes; the double-shutter baffle door can play a good role in sealing and closing.

The desulfurization wastewater drying method adopting the device comprises the following steps:

s1 high-temperature flue gas extracted from the denitration outlet enters a high-temperature flue gas inlet flue, then respectively enters an outer side flue and an inner side flue, passes through an outer side flue baffle door and an inner side flue baffle door, respectively passes through a radial swirl vane in the outer side flue and an axial swirl vane in the inner side flue, is sprayed out at a flue gas outlet to form rotary flue gas, and simultaneously forms a low-pressure backflow zone;

s2, enabling the desulfurization wastewater to enter an atomizing disc through a wastewater feeding port, driving the atomizing disc to rotate by a high-speed rotating motor, and breaking and dispersing the desulfurization wastewater into atomized droplets at the edge of the atomizing disc after the desulfurization wastewater is sprayed out; the inner side flue 5 and the high-speed rotating motor 6 are separated by the heat-insulating layer 7, so that the high-speed rotating motor 6 is prevented from being damaged by long-term high-temperature flue gas;

s3, mixing the wastewater atomization small drops with the rotating smoke in a low-pressure return zone to transfer heat, and fully contacting the rotating smoke with the wastewater atomization small drops to dry the liquid drops to dryness;

s4, after the atomized droplets are evaporated to dryness, the water vapor leaves the drying tower from a flue gas outlet at the lower part of the drying tower along with the flue gas; the dried solid matter partially falls into an ash bucket at the bottom of the drying tower and is collected and treated from an ash discharge port.

In order to realize a low-pressure return area at the flue outlet, in the step S1, the amount of flue gas entering the outer side flue and the inner side flue is controlled by adjusting the opening degree of the outer side flue damper and the inner side flue damper, so as to adjust the area of the low-pressure return area; 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; when the amount of waste water is small, the area of the reflux zone is reduced.

In order to prevent the liquid droplets from adhering to the wall surface of the drying tower, the area of the low-pressure reflux zone is changed by adjusting the angle of the outer flue damper and the radial swirl vanes in step S3.

Compared with the prior art, the invention has the following advantages:

the device and the method for drying the desulfurization wastewater solve the problems of long process flow, high investment cost and high operation and maintenance cost of the conventional desulfurization wastewater treatment system, and the technical problems of flue corrosion, large volume of a thin and high drying chamber device and easy wall surface scaling caused by the adoption of a flue evaporation technology, so that potential safety hazards are caused.

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; meanwhile, a backflow area is formed in the smoke outlet area due to the effect of smoke rotational flow; due to the existence of the low-pressure backflow area, the residence time of the flue gas in the backflow area can be prolonged, the reaction distance is shortened, and then the waste water droplets are fully contacted with the flue gas to exchange heat and evaporate the flue gas, so that the drying height of the drying tower is effectively reduced, the waste water evaporation rate is high, no droplets are left, the problem of flue corrosion does not exist, and the low-pressure backflow area has high popularization and application values.

The drying device of the invention can increase or reduce the area of the low-pressure reflux area by adjusting the angle of the baffle door and the rotational flow blade to enhance or weaken the flow velocity and the rotating speed of the flue gas in the outer flue, and meanwhile, the atomizer is additionally provided with the atomizing holes to increase the atomization degree of the wastewater, thereby reducing the influence of the temperature of the flue gas on the evaporation of the wastewater and preventing atomized liquid drops from flying out of the atomizing disc and being stained on the wall surface of the drying tower; the inner and outer flues adjust the flue gas volume to match with the radial and axial swirl blades to adjust the swirl strength to improve the waste water droplet evaporation efficiency, the whole device reduces auxiliary devices such as temperature sensors, various electric valves and vortex-proof plates, 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 view of a desulfurization waste water drying apparatus according to the present invention;

FIG. 2 is a schematic view of the axial swirl vane structure of the present invention;

FIG. 3 is a schematic view of the radial swirl vanes of the present invention;

FIG. 4 is a schematic view of the structure of the atomizing disk of the present invention;

FIG. 5 is a schematic view of a double-louvered flapper door of the present invention.

Reference numerals:

1-high temperature flue gas inlet, 2-outer flue damper, 3-inner flue damper, 4-outer flue, 5-inner flue, 6-high speed rotating motor, 7-heat preservation layer, 8-radial swirl vane clapboard, 9-radial swirl vane, 10-waste water feeding port, 11-atomizing disk, 12-flue gas outlet, 13-ash conveying port, 14-drying tower, 15-low pressure reflux zone, 16-rotating flue gas, 17-atomizing droplet, 18-flue flaring, 19-axial swirl vane, 20-axial swirl vane outer cylinder, 21-axial swirl vane inner cylinder, 22-atomizing hole, 23-double-hundred-leaf damper, 24-damper door frame, 25-vane, 26-link mechanism, 27-rotating shaft, A-flue gas inlet and B-flue gas outlet.

Detailed Description

The invention is described in further detail below with reference to the figures and the detailed description.

Example 1 of the invention: as shown in fig. 1-4, a desulfurization wastewater drying device comprises a high-temperature flue gas inlet flue 1, an outer side flue damper 2, an inner side flue damper 3, an outer side flue 4, an inner side flue 5, radial swirl vanes 9, a wastewater feed port 10, an atomizing disc 11, a drying tower 14 and axial swirl vanes 19; the high-temperature flue gas inlet flue 1 is communicated with an outer side flue 4 and an inner side flue 5, the outer side flue 4 is connected with an outer side flue damper 2, and the inner side flue 5 is connected with an inner side flue damper 3; the inside of the outer side flue 4 is provided with radial rotational flow blades 9 with the same rotation direction and angle, and the inside of the inner side flue 5 is provided with axial rotational flow blades 19 with the same rotation direction and angle; in order to make the flue gas flow more uniform, a plurality of swirl vanes are respectively arranged in the two flues, the radial swirl vanes 9 are circumferentially arrayed around the outer flue 4, and the circumferential array angle is 15 degrees; the axial swirl blades 19 are circumferentially arrayed around the inner side flue 5, and the circumferential array angle is 30 degrees; in order to change the strength and the direction of the high-temperature flue gas rotational flow, the included angle between the radial rotational flow blade 9 and the incoming flow direction of the flue gas in the outer side flue 4 is 15 degrees; the included angle between the axial swirl blades 19 and the axis of the inner side flue 5 is 75 degrees, and more swirl adjustment options can be provided by combining the swirl blades in two directions at different angles; the outlet of the flue is provided with a flue flaring 18, and the angle of the flue flaring is 15 degrees; the flue flaring 18 comprises a flaring of the inner side flue 5 and a flaring of the outer side flue 4, the flaring length of the inner side flue 5 is 0.2 times of the diameter of the corresponding flue, the flaring length of the outer side flue 4 is 0.6 times of the diameter of the corresponding flue, and the flaring outlets of the two flues are flush; the wastewater feeding port 10 is connected with a wastewater atomizing disc 11; the outlet of the atomizing disc 11 is arranged at the upper part of the drying tower 14; in order to fully atomize the wastewater and facilitate the drying of the wastewater by distillation, 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 damper 2 and the inner side flue damper 3 are double-shutter dampers 23, and the double-shutter dampers 23 are welded with the flue or connected with the flue by 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, 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 to adjust the high-temperature flue gas inlet amount of the inner side flue and the outer side flue.

The desulfurization wastewater drying method adopting the device comprises the following steps:

s1 high-temperature flue gas extracted from a denitration outlet is at the temperature range of (280-; when the outer side flue damper 2 is adjusted to be small and the inner side flue damper 3 is adjusted to be large or not adjusted, the area of a backflow area can be reduced; the rotating speed of the radial rotational flow blades 9 is greater than that of the axial rotational flow blades 19, smoke passes through the rotational flow effect of the inner flue and the outer flue, so that the smoke at the outlet has a larger rotating effect, and the flow speed of the smoke at the outlet is relatively higher, so that the smoke is sprayed out to form rotating smoke 16 at the smoke outlet, and a low-pressure backflow area 15 is formed;

s2, enabling the desulfurization wastewater to enter an atomizing disc 11 through a wastewater feeding port 10, driving the atomizing disc 11 to rotate through a high-speed rotating motor 6, and after the desulfurization wastewater is sprayed out, stretching the desulfurization wastewater into a film or drawing the desulfurization wastewater into filaments which are broken and dispersed at the edge of the atomizing disc 11 into atomized small droplets 17; the inner side flue 5 and the high-speed rotating motor 6 are separated by the heat-insulating layer 7, so that the high-speed rotating motor 6 is prevented from being damaged by long-term high-temperature flue gas;

s3, mixing the waste water atomization small droplets 17 with the rotating smoke 16 in the low-pressure return zone 15 for heat transfer, and fully contacting the rotating smoke 16 with the waste water atomization small droplets 17 to evaporate the droplets to dryness; because the amount of desulfurization wastewater to be treated is not constant, when the amount of wastewater is large, the area of the low-pressure reflux area 15 is increased, so that the wastewater atomization small liquid droplets 17 can exchange heat fully; when the amount of waste water is small, the area of the low-pressure reflux area 15 is reduced; in order to prevent liquid drops from being attached to the wall surface of the drying tower 14, the angles of the baffle door 2 of the outer side flue and the radial swirl blades 9 can be adjusted to be large, the flow speed and the rotating speed of flue gas in the outer side flue 4 are enhanced, the area of the low-pressure reflux area 15 is further enlarged, and atomized small liquid drops 17 are included in the low-pressure reflux area 15;

s4, after the atomized small droplets 17 are evaporated to dryness, the water vapor leaves the drying tower 14 from the flue gas outlet 12 at the lower part of the drying tower 14 along with the flue gas; the dried solid matter partially falls into an ash hopper at the bottom of the drying tower 14 and is collected and treated from an ash discharge port 13.