CN108046499B - Desulfurization waste water drying energy-saving and emission-reducing system with spray tower as feeding bin - Google Patents
Desulfurization waste water drying energy-saving and emission-reducing system with spray tower as feeding bin Download PDFInfo
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- CN108046499B CN108046499B CN201711364616.7A CN201711364616A CN108046499B CN 108046499 B CN108046499 B CN 108046499B CN 201711364616 A CN201711364616 A CN 201711364616A CN 108046499 B CN108046499 B CN 108046499B
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- 239000007921 spray Substances 0.000 title claims abstract description 131
- 238000001035 drying Methods 0.000 title claims abstract description 121
- 239000002351 wastewater Substances 0.000 title claims abstract description 101
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 91
- 230000023556 desulfurization Effects 0.000 title claims abstract description 91
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000003546 flue gas Substances 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000000428 dust Substances 0.000 claims abstract description 22
- 150000003839 salts Chemical class 0.000 claims abstract description 13
- 238000001223 reverse osmosis Methods 0.000 claims description 18
- 230000003009 desulfurizing effect Effects 0.000 claims description 12
- 239000000779 smoke Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 238000005189 flocculation Methods 0.000 claims description 7
- 230000016615 flocculation Effects 0.000 claims description 7
- 238000004065 wastewater treatment Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 14
- 238000002425 crystallisation Methods 0.000 abstract description 6
- 230000008025 crystallization Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 11
- 239000000203 mixture Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 1
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002918 waste heat Substances 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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
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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)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Treating Waste Gases (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a desulfurization waste water drying energy-saving and emission-reducing system taking a spray tower as a charging bin, which comprises a flue gas treatment system, a waste water pretreatment unit, a spray tower, a drying tower, a crystallization salt, a water inlet, a flue gas outlet, a flue gas inlet and a flue gas outlet, wherein the flue gas treatment system consists of an air preheater, a dust remover, a draught fan, a desulfurization tower and a chimney which are sequentially connected; its advantages are low energy consumption, high safety and reliability and low cost.
Description
Technical Field
The invention relates to a desulfurization wastewater treatment technology, in particular to a desulfurization wastewater drying energy-saving and emission-reducing system taking a spray tower as a charging bin.
Background
Flue gas discharged from the boiler enters a desulfurization system from an electric dust collector, desulfurization is implemented in an absorption tower in the desulfurization system, and the flue gas is discharged into the atmosphere from a chimney after the humidity of the flue gas is removed by a demister. Along with the continuous enhancement of the reaction in the absorption tower, a great deal of active ingredients of the absorbent are consumed, the generated calcium sulfite becomes gypsum after forced oxidation, and meanwhile, chloride contained in the flue gas can be dissolved into the absorption liquid to form desulfurization wastewater in the flue gas washing process of the absorbent. The desulfurization waste water has the characteristics of higher waste water turbidity, higher suspended matter content, heavy metal content, lower particle viscosity and the like, and is the most difficult waste water to be treated in the currently recognized thermal power plant.
At present, the common desulfurization wastewater treatment modes at home and abroad mainly comprise a chemical method, a membrane concentration and evaporation crystallization method and a flue spraying method.
Chemical method: at present, the wet desulfurization wastewater of most domestic power plants is pretreated by adopting the methods of triple box process neutralization, flocculation, reaction, precipitation, separation and the like, and sludge is subjected to filter pressing and outward transportation. The treated desulfurization wastewater is generally discharged up to the standard or is simply recycled by dry ash humidification, ash field spraying and the like. The method can effectively reduce suspended matters, heavy metals, F-, SO in the desulfurization wastewater 4 2-, SS, but the treated desulfurization waste water has extremely high salt content and high chloride ion concentration, has extremely strong corrosiveness to metals and equipment, and can not be reused in other systems, thus restricting the zero emission of the waste water of the whole power plant.
Membrane concentration+evaporative crystallization: the effluent of the prior pretreatment system enters an advanced treatment system again, and the membrane concentration and evaporation crystallization process is adopted, so that the desulfurization wastewater can be separated into high-quality water (steam) and solid crystalline salt by the evaporation crystallization device through wastewater membrane concentration reduction quantization, and the zero emission of the desulfurization wastewater is realized. However, the purity of the obtained solid crystalline salt can not reach the purity standard (95%) of industrial salt, and the recycling of the salt can not be realized, and the investment cost, the running cost and the energy consumption are high.
Flue spraying method: the desulfurization waste water is reduced by the triple box process, sprayed into an evaporator from top to bottom, and flue gas at 300-400 ℃ is introduced into a flue between an air preheater and a denitration device to form spiral ascending air flow, the spiral ascending air flow is intensively mixed with atomized liquid drops to evaporate, salt precipitation enters the flue between the air preheater and a dust remover along with the flue gas, and finally is trapped by the dust remover. However, the flue is difficult to reform, the resistance between the drying tower and the air preheater is not easy to match, and the energy consumption is high. The other method is that the desulfurization waste water is directly sprayed into a flue of an inlet of the electric dust collector, and the desulfurization waste water is evaporated to dryness by utilizing low-temperature flue gas, but in actual operation, the flue and a nozzle are seriously scaled due to incomplete evaporation of the desulfurization waste water due to lower flue gas temperature.
Disclosure of Invention
The invention aims to solve the technical problem of providing a desulfurization waste water drying energy-saving and emission-reducing system taking a spray tower as a charging bin, which has the advantages of low energy consumption, high safety and reliability and low cost.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides an use desulfurizing waste water drying energy saving and emission reduction system of spray column as reinforced storehouse, includes flue gas treatment system, flue gas treatment system constitute by air heater, dust remover, draught fan, desulfurizing tower and chimney, air heater's flue gas export with the entry linkage of dust remover, the export of dust remover with the entry linkage of draught fan, the export of draught fan with the inlet connection of desulfurizing tower, the exhaust port of desulfurizing tower with the chimney be connected, its characterized in that: the system also comprises a wastewater pretreatment unit for carrying out precipitation, flocculation and softening treatment on desulfurization wastewater from the desulfurization tower, a spray tower used as a desulfurization wastewater feeding bin, and a drying tower for drying the desulfurization wastewater by using hot air and discharging obtained crystalline salt, wherein the input end of the wastewater pretreatment unit is connected with a water outlet of the desulfurization tower, the output end of the wastewater pretreatment unit is connected with a water inlet of the spray tower, a smoke inlet of the spray tower is connected with an outlet of the induced draft fan, a smoke outlet of the spray tower is connected with a smoke inlet of the desulfurization tower, a discharge outlet of the spray tower is connected with a feed inlet of the drying tower, hot air is introduced into an air inlet of the drying tower, and an air outlet of the drying tower is connected with an inlet of the dust remover.
The air inlet of the drying tower is connected with a hot air supply mechanism, the hot air supply mechanism comprises an air blower and an air heater, the inlet of the air blower is used for introducing air, the outlet of the air blower is connected with the inlet of the air heater, and the outlet of the air heater is connected with the air inlet of the drying tower; the air heater is used for heating the air introduced by the air blower to obtain hot air which is supplied to the drying tower, the heat source of the air heater is provided by steam, and the steam is extracted from the steam turbine, so that the energy consumption is low; the air heater may heat the air to about 300 ℃.
Or the air inlet of the drying tower is connected with a hot air supply mechanism, the hot air supply mechanism comprises an air blower, the inlet of the air blower is connected with the hot air outlet of the air preheater, namely the air channel of the hot secondary air outlet, and the outlet of the air blower is connected with the air inlet of the drying tower; the hot air is directly introduced into the drying tower from the air duct of the hot secondary air outlet of the air preheater by the air blower, so that the energy consumption is low.
Or the air inlet of the drying tower is connected with a hot air supply mechanism, the hot air supply mechanism comprises an air heater, the inlet of the air heater is used for introducing air, and the outlet of the air heater is connected with the air inlet of the drying tower; the air heater is used for heating the air to obtain hot air, the hot air is supplied to the drying tower, the heat source of the air heater is provided by steam, and the steam is extracted from the steam turbine, so that the energy consumption is low; the air heater may heat the air to about 300 ℃.
Or the air inlet of the drying tower is directly connected with the hot air outlet of the air preheater, namely the air channel of the hot secondary air outlet. The hot air in the air duct of the hot secondary air outlet of the air preheater is directly introduced into the drying tower, so that the energy consumption is low.
The system also comprises a reverse osmosis unit for increasing the concentration of the desulfurization wastewater to achieve decrement treatment, wherein the input end of the reverse osmosis unit is connected with the output end of the wastewater pretreatment unit, and the output end of the reverse osmosis unit is connected with the water inlet of the spray tower. Here, the concentration of the desulfurization wastewater is increased by using the reverse osmosis unit, thereby achieving the reduction treatment.
The novel desulfurization waste water treatment device is characterized in that a spray layer is arranged in the spray tower, a water inlet of the spray tower is communicated with the spray layer, and a waste water tank for storing desulfurization waste water output by an output end of the reverse osmosis unit and a spray pump for providing the desulfurization waste water stored in the waste water tank for the spray layer are arranged between an output end of the reverse osmosis unit and the water inlet of the spray tower.
A flue gas fan for introducing the flue gas output by the induced draft fan into the spray tower is arranged between the flue gas inlet of the spray tower and the outlet of the induced draft fan.
The drying tower is a fluidized bed or an empty flue.
A feeding device for feeding the desulfurization wastewater output by the spray tower to the drying tower is arranged between the discharge hole of the spray tower and the feed hole of the drying tower. The feeder may take various forms of existing feeders.
The drying tower is characterized in that a scaling spray pipe and a feeding fan are arranged between the spray tower and the drying tower, a water inlet of the scaling spray pipe is connected with a discharge hole of the spray tower, an air inlet of the scaling spray pipe is connected with an air outlet of the feeding fan, hot air is introduced into the air inlet of the feeding fan, and a wind-material mixing outlet of the scaling spray pipe is connected with a feed inlet of the drying tower. The wind mixture is sprayed into the drying tower by means of a convergent-divergent nozzle.
The drying tower is characterized in that a feeder, a scaling spray pipe and a feeding fan are arranged between the spray tower and the drying tower, a feed inlet of the feeder is connected with a discharge outlet of the spray tower, a discharge outlet of the feeder is connected with a water inlet of the scaling spray pipe, an air inlet of the scaling spray pipe is connected with an air outlet of the feeding fan, hot air is introduced into the air inlet of the feeding fan, and a wind-material mixing outlet of the scaling spray pipe is connected with the feed inlet of the drying tower. The wind mixture is sprayed into the drying tower by means of a convergent-divergent nozzle.
Compared with the prior art, the invention has the advantages that:
1) The spray tower is used as the desulfurization wastewater feeding bin of the drying tower, so that the spray tower is directly fed to the drying tower, the corrosion and blockage risks in the concentrated desulfurization wastewater conveying process are greatly reduced, the energy consumption is greatly reduced, and the safety and reliability are improved.
2) The waste heat of the flue gas output by the induced draft fan is utilized to implement decrement treatment on the desulfurization waste water in the spray tower, the amount of the desulfurization waste water is reduced to one tenth or even less of the original amount, namely, the spray tower can even dry the desulfurization waste water to a muddy water state.
3) The concentrated desulfurization waste water in the drying tower is dried by using hot air, and the obtained crystalline salt is brought into a dust remover, and the crystalline salt is trapped by the dust remover and uniformly mixed into fly ash to be removed, so that the energy consumption is greatly reduced, and the safety and reliability are improved.
4) The desulfurization wastewater from the desulfurization tower is subjected to precipitation, flocculation and softening treatment by utilizing the wastewater pretreatment unit, so that the expensive triple box process and the dosing cost are saved, and the cost is reduced.
5) The drying tower utilizes hot air to carry out drying treatment on the concentrated desulfurization wastewater, and because the temperature of the hot air is higher, the drying tower is not easy to scale.
Drawings
FIG. 1 is a schematic diagram of the composition structure of a desulfurization waste water drying energy-saving and emission-reducing system according to the first embodiment;
fig. 2 is a schematic diagram of a composition structure of a desulfurization waste water drying energy-saving and emission-reducing system in the second embodiment;
fig. 3 is a schematic diagram of the composition structure of a desulfurization waste water drying energy-saving and emission-reducing system in the third embodiment;
fig. 4 is a schematic diagram of the composition structure of a desulfurization waste water drying energy-saving and emission-reducing system in the fourth embodiment;
FIG. 5 is a schematic diagram of the composition structure of a desulfurization waste water drying energy-saving and emission-reducing system in the fifth embodiment;
fig. 6 is a schematic diagram of the composition structure of the desulfurization waste water drying energy-saving and emission-reducing system in the sixth embodiment.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
Embodiment one:
the desulfurization waste water drying energy-saving and emission-reducing system using a spray tower as a charging bin is provided in the embodiment, as shown in fig. 1, and comprises a flue gas treatment system 1, wherein the flue gas treatment system 1 consists of an air preheater 11, a dust remover 12, a draught fan 13, a desulfurization tower 14 and a chimney 15, a flue gas outlet of the air preheater 11 is connected with an inlet of the dust remover 12, an outlet of the dust remover 12 is connected with an inlet of the draught fan 13, an outlet of the draught fan 13 is connected with a flue gas inlet of the desulfurization tower 14, a flue gas outlet of the desulfurization tower 14 is connected with the chimney 15, the system further comprises a waste water pretreatment unit 2 for carrying out precipitation, flocculation and softening treatment on desulfurization waste water from the desulfurization tower 14, a reverse osmosis unit 3 for increasing the concentration of the desulfurization waste water to achieve reduction treatment, a waste water tank 4 for storing the desulfurization waste water output by the output end of the reverse osmosis unit 3, a spray pump 5, a spray tower 6 for being used as a desulfurization waste water charging bin, a drying tower 7 for drying treatment of the desulfurization waste water by hot air and discharging the obtained crystallization salt, the input end of the wastewater pretreatment unit 2 is connected with the water outlet of the desulfurizing tower 14, the output end of the wastewater pretreatment unit 2 is connected with the input end of the reverse osmosis unit 3, the output end of the reverse osmosis unit 3 is connected with the water inlet of the wastewater tank 4, the water outlet of the wastewater tank 4 is connected with the water inlet of the spray pump 5, the water outlet of the spray pump 5 is connected with the water inlet of the spray tower 6, the spray tower 6 is internally provided with a spray layer 61, the water inlet of the spray tower 6 is communicated with the spray layer 61, the spray pump 5 provides the desulfurizing wastewater stored in the wastewater tank 4 to the spray layer 61, the smoke inlet of the spray tower 6 is connected with the outlet of the induced draft fan 13 through the smoke fan 62, the smoke fan 62 introduces the smoke output by the induced draft fan 13 into the spray tower 6, the outlet flue of spray tower 6 is connected with the inlet flue of desulfurizing tower 14, and the discharge gate of spray tower 6 is connected with the feed inlet of drying tower 7, and the hot air is introduced to the air inlet of drying tower 7, and the air outlet of drying tower 7 is connected with the entry of dust remover 12.
In the present embodiment, a feeder 81 for feeding the desulfurization waste water output from the spray tower 6 to the drying tower 7 is provided between the discharge port of the spray tower 6 and the feed port of the drying tower 7.
In the present embodiment, the hot air supply mechanism 9 is connected to the air inlet of the drying tower 7, the hot air supply mechanism 9 includes an air blower 91 and an air heater 92, the air is introduced into the inlet of the air blower 91, the outlet of the air blower 91 is connected to the inlet of the air heater 92, and the outlet of the air heater 92 is connected to the air inlet of the drying tower 7.
The dust remover 12 is an electric dust remover; the desulfurizing tower 14 adopts the prior art; the wastewater pretreatment unit 2 adopts a treatment device capable of carrying out sedimentation, flocculation and softening treatment on desulfurization wastewater; the reverse osmosis unit 3 adopts a treatment device capable of improving the concentration of desulfurization wastewater; the feeding device 81 can adopt various existing feeding machines; the drying tower 7 adopts a fluidized bed; the heat source of the air heater 92 is provided by steam, and the steam is extracted from a steam turbine, so that the energy consumption is low; the air heater 92 may heat the air to about 300 ℃.
Embodiment two:
the desulfurization waste water drying energy-saving and emission-reducing system using the spray tower as the feeding bin provided in this embodiment is basically the same as the system in the first embodiment, and is different in the structure of the hot air supply mechanism 9, as shown in fig. 2, specifically: the hot air supply mechanism 9 is connected to the air inlet of the drying tower 7, the hot air supply mechanism 9 comprises an air blower 91, the inlet of the air blower 91 is connected with the hot air outlet of the air preheater 11, namely the air channel of the hot secondary air outlet, and the outlet of the air blower 91 is connected with the air inlet of the drying tower 7; the hot air is directly introduced into the hot air supply drying tower 7 from the air duct of the hot secondary air outlet of the air preheater 11 by using the air blower 91, so that the energy consumption is low.
Embodiment III:
the energy-saving and emission-reducing system for drying desulfurization wastewater by using a spray tower as a feeding bin provided by the embodiment is basically the same as the structure of the system in the first embodiment, and is different in that the spray tower 6 feeds the drying tower 7 in different structures, as shown in fig. 3, and specifically comprises the following steps: a scaling spray pipe 82 and a feeding fan 83 are arranged between the spray tower 6 and the drying tower 7, a water inlet of the scaling spray pipe 82 is connected with a discharge hole of the spray tower 6, an air inlet of the scaling spray pipe 82 is connected with an air outlet of the feeding fan 83, an air inlet of the feeding fan 83 is connected with an outlet of an air heater 92 to introduce hot air, and a wind-material mixing outlet of the scaling spray pipe 82 is connected with a feed hole of the drying tower 7. The wind mixture is sprayed into the drying tower 7 by means of a convergent-divergent nozzle 82.
Embodiment four:
the energy-saving and emission-reducing system for drying desulfurization wastewater by using a spray tower as a feeding bin provided by the embodiment is basically the same as the system of the second embodiment in structure, and is different in structure that the spray tower 6 feeds the drying tower 7, as shown in fig. 4, specifically: a scaling spray pipe 82 and a feeding fan 83 are arranged between the spray tower 6 and the drying tower 7, a water inlet of the scaling spray pipe 82 is connected with a discharge hole of the spray tower 6, an air inlet of the scaling spray pipe 82 is connected with an air outlet of the feeding fan 83, an air inlet of the feeding fan 83 is connected with an outlet of the air fan 91 to introduce hot air, and a wind-material mixing outlet of the scaling spray pipe 82 is connected with a feed inlet of the drying tower 7. The wind mixture is sprayed into the drying tower 7 by means of a convergent-divergent nozzle 82.
Fifth embodiment:
the energy-saving and emission-reducing system for drying desulfurization wastewater by using a spray tower as a feeding bin provided by the embodiment is basically the same as the system of the third embodiment in structure, and is different in structure of feeding the spray tower 6 to the drying tower 7 and in structure of the hot air supply mechanism 9, as shown in fig. 5, specifically: the hot air supply mechanism 9 is connected to the air inlet of the drying tower 7, the hot air supply mechanism 9 comprises an air heater 92, air is introduced into the inlet of the air heater 92, the outlet of the air heater 92 is connected with the air inlet of the drying tower 7, the air is heated by the air heater 92 to obtain hot air, the hot air is supplied to the drying tower 7, a heat source of the air heater 92 is provided by steam, the steam is extracted from a steam turbine, and the energy consumption is low; the air heater 92 may heat the air to about 300 ℃; be provided with batcher 84, scaling spray tube 82 and feed fan 83 between spray tower 6 and the drying tower 7, the feed inlet of batcher 84 is connected with the discharge gate of spray tower 6, and the discharge gate of batcher 84 is connected with the water inlet of scaling spray tube 82, and the air inlet of scaling spray tube 82 is connected with the air outlet of feed fan 83, and the air inlet of feed fan 83 is introduced with the exit linkage of air heater 92, and the wind material mixing outlet of scaling spray tube 82 is connected with the feed inlet of drying tower 7.
In this embodiment, the drying tower 7 employs an empty flue.
Example six:
the energy-saving and emission-reducing system for drying desulfurization wastewater by using a spray tower as a feeding bin provided by the embodiment is basically the same as the system of the third embodiment in structure, and is different in structure of feeding the spray tower 6 to the drying tower 7 and in source of hot air entering the drying tower 7, as shown in fig. 6, specifically: the air inlet of the drying tower 7 is directly connected with the hot air outlet of the air preheater 11, namely the air channel of the hot secondary air outlet, so that the hot air in the air channel of the hot secondary air outlet of the air preheater 11 is directly introduced into the drying tower 7, and the energy consumption is low; be provided with batcher 84, scaling spray tube 82 and feed fan 83 between spray tower 6 and the drying tower 7, the feed inlet of batcher 84 is connected with the discharge gate of spray tower 6, the discharge gate of batcher 84 is connected with the water inlet of scaling spray tube 82, the air inlet of scaling spray tube 82 is connected with the air outlet of feed fan 83, the air inlet of feed fan 83 is connected with the wind channel of the hot air outlet of air preheater 11 instant heating overgrate air outlet and is introduced hot air, the wind material mixing outlet of scaling spray tube 82 is connected with the feed inlet of drying tower 7.
In this embodiment, the drying tower 7 employs an empty flue.
The working process of the desulfurization waste water drying energy-saving emission-reducing system with the spray tower as a feeding bin is as follows: the desulfurization wastewater generated by the desulfurization tower 14 is subjected to precipitation, flocculation and softening treatment by the wastewater pretreatment unit 2 and then enters the reverse osmosis unit 3, the concentration of the desulfurization wastewater in the reverse osmosis unit 3 is further improved, the high-concentration desulfurization wastewater is injected into the spray layer 61 to be sprayed into the spray tower 6 after passing through the spray pump 5, hot air enters the drying tower 7 to carry out drying treatment on the desulfurization wastewater output by the spray tower 6, and the crystallized salt obtained after drying is carried into the dust remover 12 by the hot air to be removed.
Claims (6)
1. The utility model provides an use desulfurizing waste water drying energy saving and emission reduction system of spray column as reinforced storehouse, includes flue gas treatment system, flue gas treatment system constitute by air heater, dust remover, draught fan, desulfurizing tower and chimney, air heater's flue gas export with the entry linkage of dust remover, the export of dust remover with the entry linkage of draught fan, the export of draught fan with the inlet connection of desulfurizing tower, the exhaust port of desulfurizing tower with the chimney be connected, its characterized in that: the system also comprises a wastewater pretreatment unit for carrying out sedimentation, flocculation and softening treatment on desulfurization wastewater from the desulfurization tower, a reverse osmosis unit for increasing the concentration of the desulfurization wastewater to achieve decrement treatment, a spray tower used as a desulfurization wastewater feeding bin, and a drying tower for drying the desulfurization wastewater by using hot air and discharging obtained crystalline salt, wherein the drying tower is a fluidized bed or an empty flue, the input end of the wastewater pretreatment unit is connected with a water outlet of the desulfurization tower, the output end of the wastewater pretreatment unit is connected with the input end of the reverse osmosis unit, the output end of the reverse osmosis unit is connected with a water inlet of the spray tower, a smoke inlet of the spray tower is connected with an outlet of the induced draft fan, a smoke outlet of the spray tower is connected with a smoke inlet of the spray tower, a discharge outlet of the spray tower is connected with a feed inlet of the drying tower, a hot air is introduced into an air inlet of the drying tower, and a smoke outlet of the drying tower is connected with a dust collector;
the air inlet of the drying tower is connected with a hot air supply mechanism, the hot air supply mechanism comprises an air blower and an air heater, the inlet of the air blower is used for introducing air, the outlet of the air blower is connected with the inlet of the air heater, and the outlet of the air heater is connected with the air inlet of the drying tower;
or the air inlet of the drying tower is connected with a hot air supply mechanism, the hot air supply mechanism comprises an air blower, the inlet of the air blower is connected with the hot air outlet of the air preheater, and the outlet of the air blower is connected with the air inlet of the drying tower;
or the air inlet of the drying tower is connected with a hot air supply mechanism, the hot air supply mechanism comprises an air heater, the inlet of the air heater is used for introducing air, and the outlet of the air heater is connected with the air inlet of the drying tower;
or the air inlet of the drying tower is directly connected with the hot air outlet of the air preheater.
2. The desulfurization waste water drying energy-saving and emission-reducing system taking a spray tower as a charging bin as claimed in claim 1, wherein the desulfurization waste water drying energy-saving and emission-reducing system is characterized in that: the novel desulfurization waste water treatment device is characterized in that a spray layer is arranged in the spray tower, a water inlet of the spray tower is communicated with the spray layer, and a waste water tank for storing desulfurization waste water output by an output end of the reverse osmosis unit and a spray pump for providing the desulfurization waste water stored in the waste water tank for the spray layer are arranged between an output end of the reverse osmosis unit and the water inlet of the spray tower.
3. The desulfurization waste water drying energy-saving and emission-reducing system taking a spray tower as a charging bin as claimed in claim 1, wherein the desulfurization waste water drying energy-saving and emission-reducing system is characterized in that: a flue gas fan for introducing the flue gas output by the induced draft fan into the spray tower is arranged between the flue gas inlet of the spray tower and the outlet of the induced draft fan.
4. A desulfurization waste water drying energy-saving and emission-reducing system using a spray tower as a charging bin according to any one of claims 1 to 3, characterized in that: a feeding device for feeding the desulfurization wastewater output by the spray tower to the drying tower is arranged between the discharge hole of the spray tower and the feed hole of the drying tower.
5. A desulfurization waste water drying energy-saving and emission-reducing system using a spray tower as a charging bin according to any one of claims 1 to 3, characterized in that: the drying tower is characterized in that a scaling spray pipe and a feeding fan are arranged between the spray tower and the drying tower, a water inlet of the scaling spray pipe is connected with a discharge hole of the spray tower, an air inlet of the scaling spray pipe is connected with an air outlet of the feeding fan, hot air is introduced into the air inlet of the feeding fan, and a wind-material mixing outlet of the scaling spray pipe is connected with a feed inlet of the drying tower.
6. A desulfurization waste water drying energy-saving and emission-reducing system using a spray tower as a charging bin according to any one of claims 1 to 3, characterized in that: the drying tower is characterized in that a feeder, a scaling spray pipe and a feeding fan are arranged between the spray tower and the drying tower, a feed inlet of the feeder is connected with a discharge outlet of the spray tower, a discharge outlet of the feeder is connected with a water inlet of the scaling spray pipe, an air inlet of the scaling spray pipe is connected with an air outlet of the feeding fan, hot air is introduced into the air inlet of the feeding fan, and a wind-material mixing outlet of the scaling spray pipe is connected with the feed inlet of the drying tower.
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