CN118108283A - Multi-runner drying tower for desulfurization wastewater solidification and application method thereof - Google Patents
Multi-runner drying tower for desulfurization wastewater solidification and application method thereof Download PDFInfo
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- CN118108283A CN118108283A CN202311814430.2A CN202311814430A CN118108283A CN 118108283 A CN118108283 A CN 118108283A CN 202311814430 A CN202311814430 A CN 202311814430A CN 118108283 A CN118108283 A CN 118108283A
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- 238000001035 drying Methods 0.000 title claims abstract description 203
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 83
- 230000023556 desulfurization Effects 0.000 title claims abstract description 83
- 239000002351 wastewater Substances 0.000 title claims abstract description 82
- 230000008023 solidification Effects 0.000 title claims abstract description 27
- 238000007711 solidification Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 371
- 239000003546 flue gas Substances 0.000 claims abstract description 371
- 239000007921 spray Substances 0.000 claims abstract description 93
- 239000000779 smoke Substances 0.000 claims abstract description 58
- 238000001704 evaporation Methods 0.000 claims abstract description 49
- 230000008020 evaporation Effects 0.000 claims abstract description 43
- 239000012530 fluid Substances 0.000 claims abstract description 29
- 238000005192 partition Methods 0.000 claims abstract description 11
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 6
- 239000003595 mist Substances 0.000 claims description 62
- 239000007789 gas Substances 0.000 claims description 40
- 239000000428 dust Substances 0.000 claims description 13
- 230000002035 prolonged effect Effects 0.000 claims description 10
- 238000007689 inspection Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 5
- 238000010926 purge Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 230000001376 precipitating effect Effects 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims 1
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- 239000012141 concentrate Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000001464 adherent effect Effects 0.000 description 3
- 238000000889 atomisation Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- 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
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/005—Valves
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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 discloses a multi-channel drying tower for desulfurization wastewater solidification, and relates to the technical field of wastewater treatment. The device comprises a drying tower, wherein the drying tower comprises an evaporation drying flue gas inlet, a flue gas bin, a double-fluid spray gun interface, a drying tower flue gas outlet and an ash discharge port; the smoke bin is divided into a fog drop direction-changing smoke bin and an adherence cyclone smoke bin in an annular mode by the annular partition plate; the outer wall of the upper end of the evaporation drying flue gas inlet is sequentially and annularly provided with a fog droplet diversion flue gas inlet pipe and an adherence cyclone flue gas inlet pipe from inside to outside; a plurality of fog drop diversion flue gas outlet spray pipes are annularly arranged at the bottom of the fog drop diversion flue gas bin, and a plurality of adherence swirl flue gas outlet spray pipes are annularly arranged at the bottom of the adherence swirl flue gas bin; the interface of the double-fluid spray gun is positioned below the fog drop diversion smoke outlet spray pipe and the adherence cyclone smoke outlet spray pipe. The invention can effectively complete the solidification of desulfurization wastewater and effectively avoid scale formation and blockage. The invention also discloses a use method of the multi-channel drying tower for the desulfurization wastewater solidification.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a multi-runner drying tower for desulfurization wastewater solidification. The invention also relates to a use method of the multi-channel drying tower for the desulfurization wastewater solidification.
Background
The desulfurization wastewater generated by limestone-gypsum wet desulfurization of coal-fired power plants is still not consumed by most power plants due to the characteristics of high suspended matter content, high salt content, high chloride ion concentration, complex components containing various heavy metals and pollutants and large fluctuation of water quality and water quantity; along with the stricter ecological environmental protection requirements, the national control force on the waste water of the power plant is also larger and larger, and the 'zero emission' goal of the waste water of the power plant is provided.
At present, the desulfurization wastewater zero release process mainly adopts a pretreatment, concentration decrement and terminal solidification technology, and when a two-phase flow atomization drying tower is adopted for terminal solidification, the following problems exist:
1) The concentrated desulfurization wastewater liquid after concentration and decrement has higher hardness ion content, the nozzle is easy to wear too fast in the running process of the system, and the atomized particle size is increased;
2) The variation of unit load causes great fluctuation of flue gas parameters for atomizing and drying the concentrated solution, and causes incomplete drying of fog drops of the concentrated solution of the desulfurization wastewater.
Therefore, when the desulfurization wastewater concentrated solution curing system is operated, the phenomenon of wall sticking and scaling on the inner wall of the drying tower occurs, and the manual maintenance strength is high; the double-fluid atomizing nozzle is frequently replaced, and the maintenance cost is high; under the serious condition of scale formation and blockage in the drying tower, even the concentrated solution solidifying system is required to be stopped, power plant operators can only find new absorption channels for the uncured concentrated solution, so that the requirements of the power plant on safe, stable and reliable operation of the desulfurization wastewater concentrated solution solidifying system cannot be met.
Therefore, it is necessary to develop a multi-channel drying tower for solidifying desulfurization waste water, which can flexibly adapt to various practical conditions on site, effectively avoid scaling and blocking, and reduce the replacement rate of nozzles of a multi-fluid spray gun.
Disclosure of Invention
A first object of the present invention is to overcome the above-mentioned drawbacks of the related art, and to provide a multi-channel drying tower for solidifying desulfurization waste water.
The second object of the invention is to provide a method for using the multi-channel drying tower for the solidification of desulfurization wastewater.
In order to achieve the first object, the technical scheme of the invention is as follows: the utility model provides a desulfurization is multichannel drying tower for waste water solidification, includes the drying tower, its characterized in that: the drying tower comprises an evaporation drying flue gas inlet, a flue gas bin, a double-fluid spray gun interface, a drying tower flue gas outlet and an ash discharge hole, wherein the upper end of the evaporation drying flue gas inlet is positioned above the top of the drying tower, the lower end of the evaporation drying flue gas inlet extends into the drying tower, the flue gas bin is annularly arranged between the inner wall of the top of the drying tower and the evaporation drying flue gas inlet, the double-fluid spray gun interface is positioned on the side wall of the top of the drying tower, the drying tower flue gas outlet is positioned on the side wall of the bottom of the drying tower, and the ash discharge hole is positioned at the bottom of the drying tower;
the annular partition plate is used for dividing the flue gas bin into a fog drop direction-changing flue gas bin and an adherence cyclone flue gas bin from inside to outside in sequence in an annular mode;
The outer wall of the upper end of the evaporation drying flue gas inlet is sequentially and annularly provided with a fog drop diversion flue gas inlet pipe connected with a fog drop diversion flue gas bin and an adherence cyclone flue gas inlet pipe connected with the adherence cyclone flue gas bin from inside to outside;
A plurality of fog-drop diversion flue gas outlet spray pipes are annularly arranged at the bottom of the fog-drop diversion flue gas bin, and a plurality of adherence swirl flue gas outlet spray pipes are annularly arranged at the bottom of the adherence swirl flue gas bin; the outlet end of the wall-attached cyclone flue gas outlet spray pipe faces the inner wall of the drying tower;
The interface of the double-fluid spray gun is positioned below the fog drop diversion smoke outlet spray pipe and the adherence cyclone smoke outlet spray pipe.
In the technical scheme, the plurality of radial baffles divide the fog drop diversion flue gas bin of the flue gas bin into a plurality of fog drop diversion flue gas independent gas bins uniformly, and divide the wall-attached cyclone flue gas bin of the flue gas bin into a plurality of wall-attached cyclone flue gas bin independent gas bins uniformly;
Each fog drop diversion flue gas independent gas bin bottom is provided with a plurality of fog drop diversion flue gas outlet spray pipes, and each wall-attached cyclone flue gas bin independent gas bin bottom is provided with a plurality of wall-attached cyclone flue gas outlet spray pipes.
In the above technical scheme, a plurality of fog droplet diversion flue gas inlet branch pipes are annularly arranged at the bottom of the fog droplet diversion flue gas inlet pipe, a plurality of adherence swirl flue gas inlet branch pipes are annularly arranged at the bottom of the adherence swirl flue gas inlet pipe, the top of each fog droplet diversion flue gas independent gas bin is correspondingly connected with the fog droplet diversion flue gas inlet branch pipe, and the top of each adherence swirl flue gas bin independent gas bin is correspondingly connected with the adherence swirl flue gas inlet branch pipe.
In the technical scheme, in each independent mist bin of the mist-droplet diversion flue gas, the sum of the outlet cross sections of the mist-droplet diversion flue gas outlet spray pipes is smaller than the sum of the cross sections of the mist-droplet diversion flue gas inlet branch pipes;
in each independent gas bin of the wall-attached cyclone flue gas bin, the sum of the outlet sectional areas of the wall-attached cyclone flue gas outlet spray pipes is smaller than the sum of the sectional areas of the wall-attached cyclone flue gas inlet branch pipes.
In the technical scheme, the outlet end direction of the wall-attached cyclone flue gas outlet spray pipe is tangent to the inner wall of the drying tower by 30 degrees downwards; the wall-attached cyclone flue gas outlet spray pipe is round in inlet end and flat in outlet end.
In the technical scheme, the cross section of the annular partition plate is in a herringbone shape, and the lower parts of the fog drop diversion flue gas bin and the wall-attached cyclone flue gas bin are inclined at an inclination angle of 60 degrees; the side wall of the bottom of the drying tower is provided with an inspection manhole, and the side of the cone hopper at the bottom of the drying tower is provided with a vibrator.
In the technical scheme, the side surface of the bottom of the SCR reactor is connected with a high-temperature flue gas input pipe, a first baffle door and a fan are arranged on a high-temperature flue gas pipeline, the high-temperature flue gas pipeline is divided into three paths, a first pipeline is connected with an evaporation drying flue gas inlet, a second pipeline is connected with a mist-drop diversion flue gas inlet pipe, and a third pipeline is connected with an adherence cyclone flue gas inlet pipe; the flue gas outlet of the drying tower is connected with the dust remover through a high-temperature flue gas discharge pipe, and a second baffle door is arranged on the high-temperature flue gas discharge pipe; the bottom of the SCR reactor is connected with a dust remover.
In the above technical scheme, be provided with first electric butterfly valve on the first pipeline, be provided with the second electric butterfly valve on the second pipeline, be provided with the third electric butterfly valve on the third pipeline.
In order to achieve the second object, the technical scheme of the invention is as follows: the application method of the multi-channel drying tower for the desulfurization wastewater solidification is characterized by comprising the following steps of:
Step 1: opening the first baffle door and the second baffle door, opening a third electric butterfly valve, and starting a fan;
Step 2: the high-temperature flue gas after denitration of the SCR reactor sequentially passes through a high-temperature flue gas pipeline, a third pipeline, an adherence cyclone flue gas inlet pipe and an adherence cyclone flue gas inlet branch pipe to enter each adherence cyclone flue gas bin and separate gas bins through an adherence cyclone flue gas outlet spray pipe of each adherence cyclone flue gas bin and separate gas bin, and is sprayed out towards the inner wall of the drying tower, a layer of cyclone adherence flue gas is formed on the inner wall of the drying tower, and an adherence protection flue gas zone is formed in the area between the inner wall of the drying tower and the lower part of the adherence cyclone flue gas outlet spray pipe;
Step 3: opening the second electric butterfly valve and the first electric butterfly valve; after the second electric butterfly valve is opened, high-temperature smoke sequentially enters each independent mist bin of mist-drop diversion smoke through a high-temperature smoke pipeline, a second pipeline, a mist-drop diversion smoke inlet pipe and a mist-drop diversion smoke inlet branch pipe, the high-temperature smoke is sprayed out through a mist-drop diversion smoke outlet spray pipe of the independent mist bin of mist-drop diversion smoke, a circle of mist-drop diversion smoke flow is formed circumferentially along the outer side of the wall of the evaporation drying smoke inlet pipe, and a mist-drop diversion area is formed in the area below the mist-drop diversion smoke outlet spray pipe by the mist-drop diversion smoke flow;
after the first electric butterfly valve is opened, high-temperature flue gas sequentially enters the drying tower through a high-temperature flue gas pipeline, a first pipeline and an evaporation drying flue gas inlet, and a main evaporation drying flue gas area is formed in the area below the evaporation drying flue gas inlet by the high-temperature flue gas;
the area between the adherence protection smoke area and the fog drop diversion area is a drying buffer area;
Step 4: introducing compressed air into the double-fluid spray gun, starting a concentrated solution conveying pump, conveying the desulfurization wastewater concentrated solution, atomizing the desulfurization wastewater concentrated solution by using the compressed air, and spraying the desulfurization wastewater concentrated solution into the drying tower through a nozzle of the double-fluid spray gun arranged at the joint of the double-fluid spray gun;
Step 5: firstly evaporating the desulfurization waste water concentrated solution fog drops in a main evaporation drying smoke zone, and reducing the particle size of the desulfurization waste water concentrated solution fog drops; then, the desulfurization waste water concentrated solution fog drops reach a fog drop turning area and are purged by the vertical downward fog drop turning flue gas flow, and the vertical downward dividing speed of the desulfurization waste water concentrated solution fog drops is increased; then, the desulfurization waste water concentrated solution droplets enter a drying buffer zone, and as the vertical downward separation speed of the desulfurization waste water concentrated solution droplets is increased, the movement path of the desulfurization waste water concentrated solution droplets is prolonged, and the desulfurization waste water concentrated solution droplets are further evaporated and dried; cyclone adherence flue gas in adherence protection flue gas zone moves downwards along spiral of drying tower inner wall, sweeps drying tower inner wall
Step 6: evaporating and drying the concentrated solution mist drops of the desulfurization wastewater to form dry ash, enabling the dry ash to move towards the bottom of the drying tower along with high-temperature flue gas, collecting and precipitating most of the dry ash in a cone hopper at the bottom of the drying tower, discharging the dry ash outside through an ash discharge hole under the action of a cone hopper side vibrator, and sending a small amount of dry ash into a dust remover along with the high-temperature flue gas through a high-temperature flue gas discharge pipe along with a drying tower flue gas outlet at the side surface of the bottom of the drying tower; completing the solidification of desulfurization wastewater;
step 7: sequentially closing the concentrated solution delivery pump, compressed air of the double-fluid spray gun, the second electric butterfly valve and the first electric butterfly valve;
step 8: sequentially closing the fan, the third electric butterfly valve, the first baffle door and the second baffle door, and stopping the system;
Step 9: during system shutdown, the scaling condition of the inner wall of the drying tower is checked regularly through the inspection manhole, if an initial scaling phenomenon is found, when the next system is operated, the purging time of the attached cyclone flue gas outlet spray pipe is prolonged after the fan is started, and the flue gas inlet quantity of the mist diversion flue gas inlet pipe is increased.
In the above technical scheme, in step 5, according to the parameter of the flue gas measured by the outlet of the SCR reactor, the opening of the second electric butterfly valve is adjusted.
Compared with the prior art, the invention has the following advantages:
1) The hot air for drying is taken from high-temperature flue gas at the bottom of the SCR reactor, and a heater is not required to be additionally arranged; the drying tower is an upper-inlet lower-outlet hollow tower, and has a simple structure; the system is provided with a fan, so that the flue gas amount for drying the desulfurization waste water concentrate droplets is ensured, and the problem of wet wall scaling caused by incomplete drying of the desulfurization waste water concentrate droplets in the tower when the load change of a unit is large is solved.
2) The drying tower is a multi-channel air inlet, and an adherence protection smoke zone, a drying buffer zone, a fog drop diversion zone and a main evaporation drying smoke zone are formed in the drying tower; atomizing and spraying the desulfurization waste water concentrated solution into a drying tower by a double-fluid spray gun, wherein mist drops of the desulfurization waste water concentrated solution are firstly evaporated in a main evaporation drying flue gas area, and the particle size of the mist drops is reduced; when the fog drops reach the fog drop diversion area, the fog drops are purged by the vertical downward high-speed diversion airflow, and the vertical downward diversion speed is increased; the fog drops enter a drying buffer zone, and as the vertical downward dividing speed of the fog drops is higher, the movement path is greatly prolonged, and the fog drops are further evaporated until being dried; in the wall-attached protection flue gas area, the high-temperature wall-attached cyclone flue gas moves downwards at a high speed along the inner wall of the drying tower in a spiral way, so that the inner wall of the drying tower is effectively purged; the desulfurization wastewater solidification is efficiently completed, and meanwhile, scale formation and blockage are effectively avoided.
3) When the atomization effect is poor and the smoke parameters for drying are greatly changed due to the abrasion of the nozzle of the double-fluid spray gun, the motion track of the mist drops of the desulfurization waste water concentrate is effectively controlled by adjusting the smoke flow of the mist drop diversion smoke outlet spray pipe in the mist drop diversion area, the evaporation and drying time of the mist drops of the desulfurization waste water concentrate is ensured, and the drying effect is ensured; simultaneously, the flue gas flow of the attached cyclone flue gas outlet spray pipe is matched and regulated, so that double protection effects are formed on preventing scaling of the tower wall of the drying tower, the replacement rate of the multi-fluid spray gun nozzle is reduced, and the cost is saved.
4) The top of the drying tower is provided with the adjacent wall-attached cyclone flue gas bin and the adjacent mist turning flue gas bin, and the wall-attached cyclone flue gas bin and the mist turning flue gas bin are separated by the annular partition plate, so that the cyclone wall-attached flue gas and the mist turning flue gas are mutually independent; and the flue gas quantity of cyclone adherence flue gas and fog drop diversion flue gas can be flexibly adjusted according to actual working conditions, and the system adjustment range is wide.
5) The invention discloses a fog-drop diversion flue gas inlet pipe and an adherence cyclone flue gas inlet pipe which are both in annular arrangement, wherein a plurality of fog-drop diversion flue gas inlet branch pipes are annularly arranged at the bottom of the fog-drop diversion flue gas inlet pipe, and the plurality of fog-drop diversion flue gas inlet branch pipes are respectively led into corresponding independent fog bins of fog-drop diversion flue gas; a plurality of adherence cyclone flue gas inlet branch pipes are annularly arranged at the bottom of the adherence cyclone flue gas inlet pipe, a plurality of adherence cyclone flue gas inlet branch pipes are respectively introduced into corresponding adherence cyclone flue gas bin independent gas bins, the uniformity of the flue gas distribution of each fog drop diversion flue gas independent gas bin and the adherence cyclone flue gas bin independent gas bin is ensured, and then stable fog drop diversion flue gas flow and cyclone adherence flue gas are formed.
6) According to the invention, the mist turning flue gas bin is divided into a plurality of mist turning flue gas independent gas bins along the circumferential direction of the drying tower by a plurality of radial partition plates, and meanwhile, each mist turning flue gas independent gas bin is provided with a plurality of mist turning flue gas outlet spray pipes which are uniformly distributed along the circumferential direction of the outer side of the wall of the evaporation drying flue gas inlet pipe, so that a circle of stable mist turning flue gas flow is effectively formed; and the sum of the outlet sectional areas of the spray pipes of the spray nozzles of the spray direction changing smoke outlets is smaller than the sum of the outlet sectional areas of the branch pipes of the spray nozzles of the spray direction changing smoke outlets, so that the outlet smoke flow rate of the spray pipes of the spray direction changing smoke outlets is higher than the smoke flow rate of the evaporation drying smoke inlet, the downward movement separation speed of the spray drops of the concentrated liquid of the desulfurization waste water can be effectively increased, the movement path of the spray drops of the concentrated liquid of the desulfurization waste water is prolonged, the drying time of the spray drops of the concentrated liquid of the desulfurization waste water is prolonged, and the risk of scale formation of wet walls when the spray drops of the concentrated liquid of the desulfurization waste water are not well dried is reduced.
7) According to the wall-attached cyclone flue gas bin, a plurality of radial partition plates are circumferentially divided into a plurality of wall-attached cyclone flue gas bin independent gas bins along a drying tower, a plurality of wall-attached cyclone flue gas outlet spray pipes are arranged in each wall-attached cyclone flue gas bin independent gas bin, the wall-attached cyclone flue gas outlet spray pipes are uniformly circumferentially arranged along the inner wall of the drying tower, the outlet end direction of the wall-attached cyclone flue gas outlet spray pipes is tangential to the inner wall of the drying tower by 30 degrees downwards, and stable cyclone wall-attached flue gas is ensured to be formed along the direction of the tower wall; and the inlet end of the wall-attached cyclone flue gas outlet spray pipe is a circular pipe, the outlet end of the wall-attached cyclone flue gas outlet spray pipe is a flat pipe, and the sum of the outlet sectional areas of the wall-attached cyclone flue gas outlet spray pipes is smaller than the sum of the sectional areas of the wall-attached cyclone flue gas inlet branch pipes, so that the outlet flue gas flow velocity of the wall-attached cyclone flue gas outlet spray pipe is high, a layer of high-speed cyclone wind is formed on the inner wall of the drying tower, and the wall-attached cyclone flue gas outlet spray pipe has a good sweeping effect on the early-stage accumulated ash formed by the wet wall of the tower wall.
8) The cross section of the annular partition plate is of a herringbone design, so that the lower parts of the fog drop diversion flue gas bin and the wall-attached cyclone flue gas bin are inclined, the inclination angle is about 60 degrees, and ash in the flue gas is effectively prevented from being deposited in the corresponding fog drop diversion flue gas bin and the wall-attached cyclone flue gas bin.
9) The first pipeline is provided with the first electric butterfly valve, the second pipeline is provided with the second electric butterfly valve, and the third pipeline is provided with the third electric butterfly valve, so that the required smoke amount can be adjusted according to the operation working condition, various actual working conditions on site can be flexibly adapted, and scaling blockage of the drying tower can be effectively avoided.
Drawings
Fig. 1 is a schematic structural view of a drying tower.
Fig. 2 is a schematic structural view of a mist-droplet direction-changing flue gas inlet pipe and an adherent cyclone flue gas inlet pipe.
Fig. 3 is a schematic diagram of the structure of the mist-droplet direction-changing flue gas bin, the wall-attached cyclone flue gas bin and the evaporation drying flue gas inlet.
Fig. 4 is a schematic structural diagram of a mist-droplet direction-changing flue gas independent gas bin and an attached cyclone flue gas bin independent gas bin.
Fig. 5 is a diagram of the inner cross-section flue gas distribution area of the drying tower.
Fig. 6 is a schematic structural view of an attached swirl flue gas outlet nozzle.
Fig. 7 is a diagram showing the connection relationship among a drying tower, an SCR reactor and a dust collector.
Wherein, the device comprises a 1-drying tower, a 11-evaporation drying flue gas inlet, a 12-flue gas bin, a 121-mist turning flue gas bin, a 1211-mist turning flue gas outlet nozzle, a 1212-mist turning flue gas independent gas bin, a 122-wall-attached cyclone flue gas bin, a 1221-wall-attached cyclone flue gas outlet nozzle, a 12211-round tube, a 12212-flat tube, a 1222-wall-attached cyclone flue gas bin independent gas bin, a 123-annular baffle, a 124-radial baffle, a 13-double fluid spray gun interface, a 131-double fluid spray gun, a 14-drying tower flue gas outlet, a 15-ash discharge port, a 161-mist turning flue gas inlet tube and a 1611-mist turning flue gas inlet branch tube, 162-wall-attached cyclone flue gas inlet pipe, 1621-wall-attached cyclone flue gas inlet branch pipe, 17-inspection manhole, 18-vibrator, 2-SCR reactor, 21-high temperature flue gas input pipe, 211-first baffle gate, 212-fan, 22-first pipeline, 221-first electric butterfly valve, 23-second pipeline, 231-second electric butterfly valve, 24-third pipeline, 241-third electric butterfly valve, 3-dust remover, 31-high temperature flue gas discharge pipe, 311-second baffle gate, 41-wall-attached protective flue gas zone, 42-fog drop diversion zone, 43-main evaporation dry flue gas zone, 44-drying buffer zone.
Detailed Description
The following detailed description of the invention is, therefore, not to be taken in a limiting sense, but is made merely by way of example. While the advantages of the invention will become apparent and readily appreciated by reference to the following description.
As can be seen with reference to the accompanying drawings: as shown in fig. 1, the multi-flow channel drying tower for the solidification of desulfurization wastewater comprises a drying tower 1, wherein the drying tower 1 comprises an evaporation drying flue gas inlet 11, an annular flue gas bin 12, a double-fluid spray gun interface 13, a drying tower flue gas outlet 14 and an ash discharge opening 15, wherein the upper end of the evaporation drying flue gas inlet 11 is positioned above the top of the drying tower 1, the lower end of the evaporation drying flue gas inlet 11 extends into the drying tower 1, the annular flue gas bin 12 is positioned between the inner wall of the top of the drying tower 1 and the evaporation drying flue gas inlet 11, the double-fluid spray gun interface 13 is positioned on the side wall of the top of the drying tower 1, the drying tower flue gas outlet 14 is positioned on the side wall of the bottom of the drying tower 1, and the ash discharge opening 15 is positioned at the bottom of the drying tower 1;
as shown in fig. 3, the annular partition 123 separates the flue gas bin 12 into a mist-drop direction-changing flue gas bin 121 and an adherence cyclone flue gas bin 122 from inside to outside in an annular manner;
As shown in fig. 1 and 2, the outer wall of the upper end of the evaporation drying flue gas inlet 11 is sequentially and annularly provided with a fog-drop diversion flue gas inlet pipe 161 connected with a fog-drop diversion flue gas bin 121 and an adherence cyclone flue gas inlet pipe 162 connected with an adherence cyclone flue gas bin 122 from inside to outside;
As shown in fig. 3 and fig. 4, a plurality of mist turning flue gas outlet nozzles 1211 are annularly arranged at the bottom of the mist turning flue gas bin 121, and a plurality of adherence swirling flue gas outlet nozzles 1221 are annularly arranged at the bottom of the adherence swirling flue gas bin 122; the outlet end of the attached cyclone flue gas outlet spray pipe 1221 faces the inner wall of the drying tower 1; the plurality of mist diversion flue gas outlet nozzles 1211 are uniformly arranged along the outer circumference of the wall of the evaporation drying flue gas inlet 11; the plurality of adherence cyclone flue gas outlet nozzles 1221 are uniformly arranged along the circumferential direction of the inner wall of the drying tower 1;
as shown in fig. 3, the two-fluid spray gun interface 13 is located below the mist redirecting smoke outlet nozzle 1211 and the wall-mounted swirl smoke outlet nozzle 1221;
As shown in fig. 5, in the drying tower 1, a region between the inner wall of the drying tower 1 and the lower side of the wall-attached swirl flue gas outlet nozzle 1221 is an wall-attached protection flue gas region 41, a region below the mist-droplet direction-changing flue gas outlet nozzle 1211 is a mist-droplet direction-changing region 42, a region below the evaporation drying flue gas inlet 11 is a main evaporation drying flue gas region 43, and a region between the wall-attached protection flue gas region 41 and the mist-droplet direction-changing region 42 is a drying buffer region 44.
As shown in fig. 4, the plurality of radial baffles 124 divide the mist-droplet direction-changing flue gas bin 121 of the flue gas bin 12 into a plurality of mist-droplet direction-changing flue gas individual gas bins 1212, and divide the wall-attached cyclone flue gas bin 122 of the flue gas bin 12 into a plurality of wall-attached cyclone flue gas bin individual gas bins 1222;
A plurality of mist diversion smoke outlet nozzles 1211 are arranged at the bottom of each mist diversion smoke independent gas bin 1212, and a plurality of adherence swirl smoke outlet nozzles 1221 are arranged at the bottom of each adherence swirl smoke independent gas bin 1222.
A plurality of mist diversion flue gas inlet branch pipes 1611 are annularly arranged at the bottom of the mist diversion flue gas inlet pipe 161, a plurality of adherence swirl flue gas inlet branch pipes 1621 are annularly arranged at the bottom of the adherence swirl flue gas inlet pipe 162, each of the mist diversion flue gas independent gas bins 1212 top is connected with a plurality of mist diversion flue gas inlet branch pipes 1611, and each of the adherence swirl flue gas bin independent gas bins 1222 top is connected with a plurality of adherence swirl flue gas inlet branch pipes 1621.
In each of the mist-redirecting flue gas independent gas bins 1212, the sum of the outlet cross-sectional areas of the plurality of mist-redirecting flue gas outlet nozzles 1211 is smaller than the sum of the cross-sectional areas of the plurality of mist-redirecting flue gas inlet branches 1611; therefore, the flow rate of the flue gas at the outlet of the mist turning flue gas outlet nozzle 1211 is improved, the downward movement dividing speed of the mist is increased, the movement path of the mist reaching the wall surface is prolonged, the drying time of the mist is prolonged, and the risk of scaling of the wet wall when the mist is not well dried is reduced.
In each of the wall-mounted cyclone flue gas bin individual gas bins 1222, the sum of the outlet cross-sectional areas of the plurality of wall-mounted cyclone flue gas outlet nozzles 1221 is less than the sum of the cross-sectional areas of the plurality of wall-mounted cyclone flue gas inlet branches 1621; the flow velocity of the flue gas at the outlet of the adherent cyclone flue gas outlet nozzle 1221 is improved, a layer of high-speed cyclone wind is formed on the tower wall of the drying tower 1, and the blowing effect on the early-stage accumulated ash formed on the tower wall is good.
As shown in fig. 6, the outlet end direction of the wall-attached cyclone flue gas outlet nozzle 1221 is tangent to the inner wall of the drying tower 1 by 30 degrees; the wall-attached cyclone flue gas outlet spray pipe 1221 is provided with a circular pipe 12211 at the inlet end and a flat pipe 12212 at the outlet end; the flow velocity of the flue gas at the outlet of the adherent cyclone flue gas outlet nozzle 1221 is improved, and a thin layer of high-speed spiral downward cyclone wind is formed on the tower wall of the drying tower 1.
As shown in fig. 3, the cross section of the annular partition 123 is in a herringbone shape, the lower parts of the fog drop diversion flue gas bin 121 and the wall-attached cyclone flue gas bin 122 are inclined, the inclination angle is about 60 degrees, and ash in the flue gas is prevented from being deposited in the fog drop diversion flue gas bin 121 and the wall-attached cyclone flue gas bin 122; the drying tower 1 bottom lateral wall is provided with the inspection manhole 17, drying tower 1 bottom awl fight side is provided with the vibrator 18, and drying tower 1 bottom is the awl fight, and the vibrator 18 is used for rapping the awl fight, prevents that bottom deposition from piling up, the bottom deposition of being convenient for is discharged outward.
As shown in fig. 7, the side surface of the bottom of the SCR reactor 2 is connected with a high-temperature flue gas input pipe 21, the high-temperature flue gas pipe 21 is provided with a first baffle door 211 and a fan 212, the high-temperature flue gas pipe 21 is divided into three paths, a first pipeline 22 is connected with an evaporation drying flue gas inlet 11, a second pipeline 23 is connected with a mist-drop diversion flue gas inlet pipe 161, and a third pipeline 24 is connected with an adherence cyclone flue gas inlet pipe 162; the drying tower flue gas outlet 14 is connected with the dust remover 3 through a high-temperature flue gas discharge pipe 31, and a second baffle door 311 is arranged on the high-temperature flue gas discharge pipe 31; the bottom of the SCR reactor 2 is connected with a dust remover 3.
As shown in fig. 7, the first pipeline 22 is provided with a first electric butterfly valve 221, the second pipeline 23 is provided with a second electric butterfly valve 231, and the third pipeline 24 is provided with a third electric butterfly valve 241.
The application method of the multi-channel drying tower for the desulfurization wastewater solidification is characterized by comprising the following steps of:
Step 1: opening the first baffle door 211 and the second baffle door 311, opening the third electric butterfly valve 241, starting the fan 212, and running for 3-5min;
Step 2: the high-temperature flue gas after denitration of the SCR reactor 2 sequentially passes through the high-temperature flue gas pipeline 21, the third pipeline 24, the adherence cyclone flue gas inlet pipe 162 and the adherence cyclone flue gas inlet branch pipe 1621 to enter each adherence cyclone flue gas bin separate gas bin 1222 through the adherence cyclone flue gas outlet spray pipe 1221 of the adherence cyclone flue gas bin separate gas bin 1222 to be sprayed out towards the inner wall of the drying tower 1, and a layer of spiral downward high-speed stable cyclone adherence flue gas is formed on the inner wall of the drying tower 1 by the high-temperature flue gas to purge the inner wall of the drying tower 1; the cyclone adherence flue gas forms an adherence protection flue gas zone 41 in the area between the inner wall of the drying tower 1 and the lower part of the adherence cyclone flue gas outlet nozzle 1221;
Step 3: opening the second electric butterfly valve 231 and the first electric butterfly valve 221; after the second electric butterfly valve 231 is opened, high-temperature flue gas sequentially enters each individual mist-droplet direction-changing flue gas bin 1212 through the high-temperature flue gas pipeline 21, the second pipeline 23, the mist-droplet direction-changing flue gas inlet pipe 161 and the mist-droplet direction-changing flue gas inlet branch pipe 1611, the high-temperature flue gas is sprayed out through the mist-droplet direction-changing flue gas outlet spray pipe 1211 of the individual mist-droplet direction-changing flue gas bins 1212, a circle of mist-droplet direction-changing flue gas flow is formed along the outer circumference of the wall of the evaporation drying flue gas inlet 11, and the mist-droplet direction-changing flue gas flow forms a mist-droplet direction-changing area 42 in the area below the mist-droplet direction-changing flue gas outlet spray pipe 1211;
After the first electric butterfly valve 221 is opened, high-temperature flue gas sequentially enters the drying tower 1 through the high-temperature flue gas pipeline 21, the first pipeline 22 and the evaporation drying flue gas inlet 11, and a main evaporation drying flue gas area 43 is formed in the region below the evaporation drying flue gas inlet 11 by the high-temperature flue gas;
The area between the adherence protection smoke area 41 and the fog drop diversion area 42 is a drying buffer area 44;
Step 4: introducing compressed air into the double-fluid spray gun 131, starting a concentrated solution conveying pump, conveying the desulfurization wastewater concentrated solution, atomizing the desulfurization wastewater concentrated solution by using the compressed air, and spraying the desulfurization wastewater concentrated solution into the drying tower 1 through a nozzle of the double-fluid spray gun 131 arranged at the double-fluid spray gun interface 13;
Step 5: the desulfurization waste water concentrated solution fog drops have horizontal dividing speed (from the center of the drying tower 1 to the tower wall of the drying tower 1) and vertical dividing speed (from the tower top of the drying tower 1 to the tower bottom of the drying tower 1), the desulfurization waste water concentrated solution fog drops are firstly evaporated in a main evaporation drying flue gas area 43, and the particle size of the desulfurization waste water concentrated solution fog drops is reduced; then, the desulfurization waste water concentrated solution droplets reach the droplet diversion area 42 and are purged by the vertical downward droplet diversion flue gas flow, and the vertical downward diversion speed of the desulfurization waste water concentrated solution droplets is increased; then, the desulfurization waste water concentrate droplets enter a drying buffer zone 44, and as the vertical downward component speed of the desulfurization waste water concentrate droplets increases, the movement path of the desulfurization waste water concentrate droplets is greatly prolonged, and the desulfurization waste water concentrate droplets are further evaporated and dried; the cyclone adherence flue gas of the adherence protection flue gas zone 41 moves downwards along the spiral of the inner wall of the drying tower 1 to sweep the inner wall of the drying tower 1
Step 6: evaporating and drying the concentrated solution mist drops of the desulfurization wastewater to form dry ash taking salt as a main component, enabling the dry ash to move towards the bottom of the drying tower 1 along with high-temperature flue gas, collecting and precipitating most of the dry ash in a cone hopper at the bottom of the drying tower 1, discharging the dry ash outwards through an ash discharge port 15 under the action of a vibrator 18, and feeding a small amount of dry ash into a dust remover 3 along with the high-temperature flue gas through a high-temperature flue gas discharge pipe 31 along with the high-temperature flue gas through a drying tower flue gas outlet 14 at the side surface of the bottom of the drying tower 1, wherein the flue gas after dust removal by the dust remover 3 enters a subsequent desulfurization system for further desulfurization; completing the solidification of desulfurization wastewater;
Step 7: sequentially closing the concentrated solution delivery pump, the compressed air of the double-fluid spray gun 131, the second electric butterfly valve 231 and the first electric butterfly valve 221, and maintaining for 3-5min;
step 8: sequentially closing the fan 212, the third electric butterfly valve 241, the first baffle door 211 and the second baffle door 311, and stopping the system;
Step 9: during system shutdown, the scaling condition of the inner wall of the drying tower 1 is periodically checked through the inspection manhole 17, if an initial scaling phenomenon is found, when the next system is operated, the purging time of the attached cyclone flue gas outlet spray pipe 1221 is prolonged after the blower 212 is started, and the flue gas inlet amount of the mist diversion flue gas inlet pipe 161 is increased.
In step 5, the opening of the second electric butterfly valve 231 is adjusted according to the parameter of the flue gas measured at the outlet of the SCR reactor 2.
Other non-illustrated parts are known in the art.
Claims (10)
1. The utility model provides a desulfurization is multichannel drying tower for waste water solidification, includes drying tower (1), its characterized in that: the drying tower (1) comprises an evaporation drying flue gas inlet (11) with the upper end positioned above the top of the drying tower (1) and the lower end extending into the drying tower (1), a flue gas bin (12) which is annularly arranged between the inner wall of the top of the drying tower (1) and the evaporation drying flue gas inlet (11), a double-fluid spray gun interface (13) positioned on the side wall of the top of the drying tower (1), a drying tower flue gas outlet (14) positioned on the side wall of the bottom of the drying tower (1) and an ash discharge opening (15) positioned at the bottom of the drying tower (1);
the annular partition plate (123) is used for dividing the flue gas bin (12) into a fog drop direction-changing flue gas bin (121) and an adherence cyclone flue gas bin (122) from inside to outside in sequence in an annular mode;
A fog droplet diversion flue gas inlet pipe (161) connected with a fog droplet diversion flue gas bin (121) and an adherence cyclone flue gas inlet pipe (162) connected with an adherence cyclone flue gas bin (122) are sequentially and annularly arranged on the outer wall of the upper end of the evaporation drying flue gas inlet (11) from inside to outside;
A plurality of mist diversion smoke outlet nozzles (1211) are annularly arranged at the bottom of the mist diversion smoke bin (121), and a plurality of adherence swirl smoke outlet nozzles (1221) are annularly arranged at the bottom of the adherence swirl smoke bin (122); the outlet end of the wall-attached cyclone flue gas outlet spray pipe (1221) faces the inner wall of the drying tower (1);
The dual fluid spray gun interface (13) is positioned below the mist diversion smoke outlet nozzle (1211) and the wall-attached cyclone smoke outlet nozzle (1221).
2. The multi-channel drying tower for desulfurization waste water solidification according to claim 1, wherein: the plurality of radial baffles (124) divide the fog drop direction-changing flue gas bin (121) of the flue gas bin (12) into a plurality of fog drop direction-changing flue gas independent gas bins (1212), and divide the wall-attached cyclone flue gas bin (122) of the flue gas bin (12) into a plurality of wall-attached cyclone flue gas bin independent gas bins (1222);
A plurality of fog drop diversion flue gas outlet spray pipes (1211) are arranged at the bottom of each fog drop diversion flue gas independent gas bin (1212), and a plurality of wall-attached cyclone flue gas outlet spray pipes (1221) are arranged at the bottom of each wall-attached cyclone flue gas bin independent gas bin (1222).
3. The multi-channel drying tower for desulfurization waste water solidification according to claim 2, wherein: the utility model discloses a mist spray diversion flue gas inlet pipe, including mist spray diversion flue gas inlet pipe (161) and wall-attached swirl flue gas inlet pipe (162), a plurality of mist spray diversion flue gas inlet branch pipes (1611) have been arranged to mist spray diversion flue gas inlet pipe (161) bottom annular, a plurality of wall-attached swirl flue gas inlet branch pipes (1621) have been arranged to wall-attached swirl flue gas inlet pipe (162) bottom annular, every mist spray diversion flue gas independent gas storehouse (1212) top all corresponds with mist spray diversion flue gas inlet branch pipe (1611) and is connected, every wall-attached swirl flue gas storehouse independent gas storehouse (1222) top all corresponds with wall-attached swirl flue gas inlet branch pipe (1621).
4. A multi-channel drying tower for the solidification of desulfurization waste water according to claim 3, wherein: in each independent mist spray bin (1212), the sum of the outlet cross sectional areas of the mist spray pipes (1211) is smaller than the sum of the cross sectional areas of the mist spray inlet branch pipes (1611);
In each of the wall-mounted cyclone flue gas bins (1222), a sum of outlet cross-sectional areas of the plurality of wall-mounted cyclone flue gas outlet nozzles (1221) is less than a sum of cross-sectional areas of the plurality of wall-mounted cyclone flue gas inlet branches (1621).
5. The multi-channel drying tower for desulfurization waste water solidification according to claim 1, wherein: the outlet end direction of the attached cyclone flue gas outlet nozzle (1221) is tangential to the inner wall of the drying tower (1) by 30 degrees downwards; the wall-attached cyclone flue gas outlet spray pipe (1221) is provided with a circular pipe (1341) at the inlet end and a flat pipe (1342) at the outlet end.
6. The multi-channel drying tower for desulfurization waste water solidification according to claim 1, wherein: the cross section of the annular partition plate (123) is in a herringbone shape, and the lower parts of the fog drop diversion flue gas bin (121) and the wall-attached cyclone flue gas bin (122) are inclined at an inclination angle of 60 degrees; an inspection manhole (17) is formed in the side wall of the bottom of the drying tower (1), and a vibrator (18) is arranged on the side of the conical hopper at the bottom of the drying tower (1).
7. The multi-channel drying tower for desulfurization waste water solidification according to claim 1, wherein: the side surface of the bottom of the SCR reactor (2) is connected with a high-temperature flue gas input pipe (21), a first baffle door (211) and a fan (212) are arranged on the high-temperature flue gas pipeline (21), the high-temperature flue gas pipeline (21) is divided into three paths, a first pipeline (22) is connected with an evaporation drying flue gas inlet (11), a second pipeline (23) is connected with a fog-drop diversion flue gas inlet pipe (161), and a third pipeline (24) is connected with an adherence cyclone flue gas inlet pipe (162); the drying tower flue gas outlet (14) is connected with the dust remover (3) through a high-temperature flue gas discharge pipe (31), and a second baffle door (311) is arranged on the high-temperature flue gas discharge pipe (31); the bottom of the SCR reactor (2) is connected with a dust remover (3).
8. The multi-channel drying tower for desulfurization waste water solidification according to claim 7, wherein: the first pipeline (22) is provided with a first electric butterfly valve (221), the second pipeline (23) is provided with a second electric butterfly valve (231), and the third pipeline (24) is provided with a third electric butterfly valve (241).
9. The application method of the multi-channel drying tower for the desulfurization wastewater solidification is characterized by comprising the following steps of:
step 1: opening the first baffle door (211) and the second baffle door (311), opening the third electric butterfly valve (241), and starting the fan (212);
Step 2: the high-temperature flue gas after denitration of the SCR reactor (2) sequentially passes through a high-temperature flue gas pipeline (21), a third pipeline (24), an adherence swirl flue gas inlet pipe (162) and an adherence swirl flue gas inlet branch pipe (1621) to enter each adherence swirl flue gas bin independent gas bin (1222), the high-temperature flue gas is sprayed out towards the inner wall of the drying tower (1) through an adherence swirl flue gas outlet spray pipe (1221) of the adherence swirl flue gas bin independent gas bins (1222), a layer of swirl adherence flue gas is formed on the inner wall of the drying tower (1), and an adherence protection flue gas zone (41) is formed in the area between the inner wall of the drying tower (1) and the lower part of the adherence swirl flue gas outlet spray pipe (1221);
Step 3: opening the second electric butterfly valve (231) and the first electric butterfly valve (221); after the second electric butterfly valve (231) is opened, high-temperature smoke sequentially passes through the high-temperature smoke pipeline (21), the second pipeline (23), the mist turning smoke inlet pipe (161) and the mist turning smoke inlet branch pipe (1611) to enter each mist turning smoke independent gas bin (1212), the high-temperature smoke is sprayed out through the mist turning smoke outlet spray pipe (1211) of the mist turning smoke independent gas bin (1212), a circle of mist turning smoke flow is circumferentially formed along the outer side of the pipe wall of the evaporation drying smoke inlet (11), and a mist turning region (42) is formed in the region below the mist turning smoke outlet spray pipe (1211);
after the first electric butterfly valve (221) is opened, high-temperature flue gas sequentially passes through the high-temperature flue gas pipeline (21), the first pipeline (22) and the evaporation drying flue gas inlet (11) to enter the drying tower (1), and a main evaporation drying flue gas region (43) is formed in the region below the evaporation drying flue gas inlet (11);
The area between the adherence protection smoke area (41) and the fog drop direction changing area (42) is a drying buffer area (44);
Step 4: introducing compressed air into the double-fluid spray gun (131), starting a concentrated solution conveying pump, conveying desulfurization wastewater concentrated solution, atomizing the desulfurization wastewater concentrated solution by using the compressed air, and spraying the desulfurization wastewater concentrated solution into the drying tower (1) through a nozzle of the double-fluid spray gun (131) arranged at the double-fluid spray gun interface (13);
Step 5: firstly evaporating the desulfurization waste water concentrated solution fog drops in a main evaporation drying flue gas area (43), and reducing the particle size of the desulfurization waste water concentrated solution fog drops; then, the desulfurization waste water concentrated solution fog drops reach a fog drop turning area (42) and are purged by the vertically downward fog drop turning flue gas flow, and the vertically downward dividing speed of the desulfurization waste water concentrated solution fog drops is increased; then, the desulfurization waste water concentrated solution droplets enter a drying buffer zone (44), and as the vertical downward component speed of the desulfurization waste water concentrated solution droplets is increased, the movement path of the desulfurization waste water concentrated solution droplets is prolonged, and the desulfurization waste water concentrated solution droplets are further evaporated and dried; the rotational flow adherence flue gas of the adherence protection flue gas zone (41) moves downwards along the spiral of the inner wall of the drying tower (1) to purge the inner wall of the drying tower (1)
Step 6: evaporating and drying the concentrated solution mist drops of the desulfurization wastewater to form dry ash, enabling the dry ash to move towards the bottom of the drying tower (1) along with high-temperature flue gas, collecting and precipitating most of the dry ash in a cone hopper at the bottom of the drying tower (1), discharging a small amount of dry ash outside through an ash discharging hole (15) under the action of a vibrator (18), and sending the dry ash into a dust remover (3) along with the high-temperature flue gas through a high-temperature flue gas discharge pipe (31) along with a flue gas outlet (14) of the drying tower on the side surface of the bottom of the drying tower (1); completing the solidification of desulfurization wastewater;
step 7: sequentially closing the concentrated solution delivery pump, compressed air of the double-fluid spray gun (131), the second electric butterfly valve (231) and the first electric butterfly valve (221);
Step 8: sequentially closing a fan (212), a third electric butterfly valve (241), a first baffle door (211) and a second baffle door (311), and stopping the system;
Step 9: during system shutdown, through the inspection manhole (17), the scale formation condition of drying tower (1) inner wall is regularly inspected, if found to have initial scale formation phenomenon, when next system operation, extension is adherence whirl flue gas outlet nozzle (1221)'s purge time behind start-up fan (212) to increase fog droplet diversion flue gas inlet pipe (161) flue gas intake.
10. The method according to claim 9, wherein in step 5, the opening of the second electric butterfly valve (231) is adjusted according to the parameter of the flue gas measured at the outlet of the SCR reactor (2).
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| Application Number | Priority Date | Filing Date | Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118929820A (en) * | 2024-09-06 | 2024-11-12 | 中铝环保节能集团有限公司 | Anti-scaling desulfurization wastewater evaporation tower |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118929820A (en) * | 2024-09-06 | 2024-11-12 | 中铝环保节能集团有限公司 | Anti-scaling desulfurization wastewater evaporation tower |
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