CN111792690A - Device and method for realizing zero discharge of desulfurization wastewater by using flue gas waste heat - Google Patents
Device and method for realizing zero discharge of desulfurization wastewater by using flue gas waste heat Download PDFInfo
- Publication number
- CN111792690A CN111792690A CN202010341892.7A CN202010341892A CN111792690A CN 111792690 A CN111792690 A CN 111792690A CN 202010341892 A CN202010341892 A CN 202010341892A CN 111792690 A CN111792690 A CN 111792690A
- Authority
- CN
- China
- Prior art keywords
- flue
- drying tower
- wastewater
- outlet
- flue gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002351 wastewater Substances 0.000 title claims abstract description 153
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 239000003546 flue gas Substances 0.000 title claims abstract description 81
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 66
- 230000023556 desulfurization Effects 0.000 title claims abstract description 66
- 239000002918 waste heat Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000001035 drying Methods 0.000 claims abstract description 99
- 239000000428 dust Substances 0.000 claims abstract description 58
- 238000001704 evaporation Methods 0.000 claims abstract description 52
- 230000008020 evaporation Effects 0.000 claims abstract description 50
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 12
- 239000010440 gypsum Substances 0.000 claims abstract description 12
- 230000018044 dehydration Effects 0.000 claims abstract description 7
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 7
- 206010022000 influenza Diseases 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 54
- 238000001914 filtration Methods 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 11
- 150000003839 salts Chemical class 0.000 claims description 11
- 238000011084 recovery Methods 0.000 claims description 9
- 238000001694 spray drying Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000005496 tempering Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 abstract description 3
- 239000002956 ash Substances 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 6
- 239000010881 fly ash Substances 0.000 description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000002927 high level radioactive waste Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000009692 water atomization Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Landscapes
- 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)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention discloses a device and a method for realizing zero discharge of desulfurization wastewater by using flue gas waste heat. The device comprises a boiler, an SCR denitration reactor, an air preheater, a first dust remover and a wet desulphurization device which are sequentially connected through a flue. An outlet flue of the SCR denitration reactor and an outlet flue of the air preheater are both communicated with an inlet flue of the drying tower through bypass flues; a waste water evaporation and concentration device is arranged between the first dust remover and the wet desulphurization device, and the wet desulphurization device is connected with a gypsum dehydration device. The intermediate-temperature flue gas between the first dust remover and the wet desulphurization device is used for concentrating and reducing the desulphurization wastewater, the wastewater amount entering a drying tower is reduced, the extraction amount of hot flue gas can be reduced, and the influence of the system on the boiler efficiency is effectively reduced. Meanwhile, the flue gas behind the SCR denitration reactor and the flue gas behind the air preheater are extracted to evaporate the waste water, so that the system energy efficiency can be effectively improved.
Description
Technical Field
The invention relates to the technical field of zero emission of thermal power desulfurization wastewater, in particular to a device and a method for realizing zero emission of desulfurization wastewater by using flue gas waste heat.
Background
In the action plan for preventing and treating water pollution, namely the water ten item, formally published in the 4 th month in 2015, the desulfurization wastewater of the thermal power plant is definitely proposed to belong to high-pollution wastewater and must be strictly controlled. The desulfurization waste water composition is complicated, and the processing degree of difficulty is very big, how to make desulfurization waste water and administer, realizes that desulfurization waste water zero release becomes the important problem that coal fired power plant awaits the solution urgently.
The desulfurization wastewater has high pollutant content and large water quality fluctuation, contains a large amount of inorganic salt ions, heavy metals and the like, and has strong pollution to the environment. Many of the heavy metal ions are the first pollutants required to be controlled in the national environmental protection standard, so the desulfurization wastewater must be separately treated.
In the desulfurization wastewater zero discharge technology implemented at present, drying and evaporating atomized desulfurization wastewater by using a bypass drying tower is one of the technologies with the most application prospects. The bypass spray drying evaporation technology has the advantages of low cost, good economy, simple structure and easy operation, and can realize zero discharge of the desulfurization wastewater of the power plant. The high-speed rotary atomizer arranged in the bypass drying tower atomizes the desulfurization wastewater into micro droplets, hot flue gas before an air preheater introduced through a bypass flue is dried and evaporated, part of dried products enter an ash hopper at the bottom of the drying tower, and the rest of the dried products and the flue gas enter the electric dust remover together to be collected and collected.
Although the rotary atomization spray drying technology has simple process, less investment and low energy consumption, the slag at the bottom of the drying tower can not be used for mixing concrete and can only be used for paving because the contents of sulfate radicals and chloride ions are higher according to the regulations of mineral admixtures for high-strength high-performance concrete (GB1T 18736-. The existing rotary atomization spray drying technology directly mixes inorganic salt separated from the desulfurization waste water by evaporation into fly ash, thereby influencing the resource utilization of the fly ash. Meanwhile, the hot flue gas used for evaporating the desulfurization wastewater by the existing rotary spray drying technology is completely taken from the hot flue gas in front of the air preheater, so that the influence on the energy consumption of the boiler is large.
Disclosure of Invention
The invention provides a device and a method for realizing zero discharge of desulfurization wastewater by using flue gas waste heat, which solve the problem of high boiler energy consumption in the prior art.
The technical scheme of the invention is realized as follows:
a device for realizing zero emission of desulfurization wastewater by using flue gas waste heat comprises an SCR (selective catalytic reduction) denitration reactor, an air preheater, a first dust remover, a wet desulfurization device and a drying tower which are sequentially connected through a flue;
the boiler, the SCR denitration reactor, the air preheater, the first dust remover and the wet desulphurization device are sequentially connected through a flue;
the outlet flue of the SCR denitration reactor and the outlet flue of the air preheater are both communicated with the inlet flue of the drying tower through bypass flues;
a waste water evaporation and concentration device is arranged between the first dust remover and the wet desulphurization device, and the wet desulphurization device is connected with a gypsum dehydration device;
the water inlet of the waste water evaporation concentration device is communicated with the water outlet of the gypsum dehydration device, and the water outlet of the waste water evaporation concentration device is communicated with the water inlet of the drying tower;
and an inlet flue of the wastewater evaporation concentration device is communicated with an outlet flue of the first dust remover, and an outlet flue of the wastewater evaporation concentration device is communicated with an inlet flue of the wet desulphurization device.
Preferably, the drying tower further comprises a second dust remover, wherein an inlet flue of the second dust remover is communicated with an outlet flue of the drying tower, and an outlet flue of the second dust remover is communicated with an inlet flue of the first dust remover;
and the ash hoppers at the bottoms of the drying tower and the second dust remover are connected with a salt recovery device.
Preferably, a flue between the SCR denitration reactor and the air preheater is communicated with a first bypass flue, and the first bypass flue is provided with an adjusting baffle plate for adjusting the amount of flue gas entering the bypass flue; a second bypass flue is communicated with a flue between the air preheater and the first dust remover; the second bypass flue is provided with an adjusting baffle plate for adjusting the amount of flue gas entering the bypass flue;
the outlet flue of the first bypass flue is communicated with the inlet flue of the drying tower, and the outlet flue of the second bypass flue is communicated with the first bypass flue.
Preferably, the waste water evaporation and concentration device comprises a box body;
an inlet flue, an outlet flue, a water inlet and a water outlet of the wastewater evaporation and concentration device are all communicated with the inner space of the box body;
the outlet flue of the wastewater evaporation concentration device is positioned above the liquid level in the box body, and the inlet flue and the water outlet of the wastewater evaporation concentration device are both positioned below the liquid level.
Preferably, an inlet flue of the drying tower is provided with an inlet baffle, and the inlet baffle adopts an adjusting execution structure;
and an outlet baffle is arranged in an outlet flue of the drying tower, and the outlet baffle adopts a switch-type execution structure.
Preferably, the drying tower is a rotary spray drying tower;
the upper part of the drying tower is provided with a volute type air distributor and a rotary atomizer;
the rotary atomizer is sleeved in the volute type air distributor, and the inlet end of the volute type air distributor is an inlet flue of the drying tower;
the inlet end of the rotary atomizer is a water inlet of the drying tower.
Preferably, an intermediate water path is arranged between the wastewater evaporation and concentration device and the drying tower;
the middle waterway comprises a filtering device, a wastewater lifting pump and a high-level wastewater tank;
the water inlet of the filtering device is communicated with the water outlet of the wastewater evaporative concentration device, the water outlet of the filtering device is communicated with the water inlet of the high-level wastewater tank, the water outlet of the high-level wastewater tank is communicated with the water inlet of the drying tower, and the wastewater lifting pump is arranged on a connecting pipeline between the high-level wastewater tank and the filtering device.
The method for realizing zero discharge of the desulfurization wastewater by using the flue gas waste heat comprises the following steps of:
concentrating the desulfurization wastewater by a wastewater evaporation concentration device after passing through a first dust remover, and spraying the concentrated desulfurization wastewater into a drying tower;
and introducing part of gas discharged by the SCR denitration reactor and the air preheater into the drying tower to be used as a heat source of the drying tower.
Preferably, the flue gas at the outlet of the drying tower passes through a second dust removal device to collect salt particles separated out by drying in the wastewater, and enters a recycling device together with ash discharged from an ash hopper at the bottom of the drying tower;
in the process of concentrating the desulfurization wastewater, finally concentrating and reducing the desulfurization wastewater to 10-50% of the original concentration;
before the concentrated desulfurization waste water is sprayed into the drying tower, the desulfurization waste water is filtered, and Ca (OH) is added2And (4) tempering the slurry to pH 9-10.
Preferably, the gas introduced into the drying tower by the SCR denitration reactor accounts for 1-3% of the total exhaust gas of the boiler;
the gas introduced into the drying tower by the air preheater accounts for 3-5% of the total exhaust amount of the boiler.
Advantageous effects
The technical proposal of the invention utilizes the medium temperature flue gas (80-120 ℃) between the first dust remover and the wet desulphurization device to firstly carry out concentration and decrement treatment on the desulphurization waste water,the waste water is concentrated to about 10 to 50 percent of the original waste water, the waste water entering a drying tower is reduced, the extraction amount of hot flue gas can be reduced, and the influence of a system on the boiler efficiency is effectively reduced; simultaneously, the temperature of the flue gas at the inlet of the wet desulphurization device can be reduced, the humidity of the flue gas can be improved, and the SO in the flue gas by the wet desulphurization device can be improved2The absorption efficiency of the wet desulphurization device is improved, and the water replenishing of the wet desulphurization device is reduced.
According to the invention, the flue gas behind the SCR denitration reactor and the flue gas behind the air preheater are simultaneously extracted to evaporate the wastewater, so that the system energy efficiency can be effectively improved.
Through set up the second dust remover at the drying tower outlet, can carry out the entrapment to the chlorine-containing crystallization product that desulfurization waste water evaporation was appeared to get into the salinity recovery system with drying tower bottom exhaust lime-ash together, can prevent to appear in the salinity gets into main system flue gas, reduce the influence to fly ash resourceization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the device for realizing zero discharge of desulfurization wastewater by using flue gas waste heat provided by the invention.
Wherein:
1: a boiler; 2: an SCR denitration reactor; 3: an air preheater; 4: a drying tower; 5: a first dust remover; 6: a waste water evaporation and concentration device; 7: a wet desulfurization unit; 8: a second dust remover; 9: a gypsum dewatering device; 10: a gypsum discharge device; 11: a filtration device; 12: a wastewater lift pump; 13: a high level wastewater tank; 14: a salt recovery device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present embodiment provides a device for realizing zero emission of desulfurization wastewater by using flue gas waste heat, which includes an SCR denitration reactor 2, an air preheater 3, a first dust remover 5, a wet desulfurization device 7, and a drying tower 4.
Boiler 1, SCR denitration reactor 2, air heater 3, first dust remover 5 and wet flue gas desulfurization device 7 connect gradually through the flue.
And an outlet flue of the SCR denitration reactor 2 and an outlet flue of the air preheater 3 are communicated with an inlet flue of the drying tower 4 through bypass flues.
A waste water evaporation and concentration device 6 is arranged between the first dust remover 5 and the wet desulphurization device 7, and the wet desulphurization device 7 is connected with a gypsum dehydration device 9.
The water inlet of the waste water evaporation concentration device 6 is communicated with the water outlet of the gypsum dehydration device 9, and the water outlet of the waste water evaporation concentration device 6 is communicated with the water inlet of the drying tower 4.
An inlet flue of the waste water evaporation and concentration device 6 is communicated with an outlet flue of the first dust remover 5, and an outlet flue of the waste water evaporation and concentration device 6 is communicated with an inlet flue of the wet desulphurization device 7.
Can be concentrated in waste water evaporation concentration device 6 by 9 exhaust desulfurization waste water of gypsum dewatering device, the waste water volume in getting into drying tower 4 has been reduced, therefore, the required hot flue gas volume of 4 dry waste water of drying tower has been reduced, the required flue gas of drying tower 4 comes from the boiler flue gas (air heater 3 can utilize the boiler flue gas to heat the air that gets into boiler 1, realize the thermal reutilization of boiler exhaust gas), the required flue gas volume of 4 dry waste water of drying tower has been reduced, the heat of corresponding 1 reutilization of boiler can increase, therefore, can effectively reduce the influence of system to boiler 1 efficiency.
One part of the flue gas extracted by the drying tower 4 comes from the outlet flue of the SCR denitration reactor 2, and the other part of the flue gas comes from the outlet flue of the air preheater 3, namely, the flue gas after heat exchange of the air preheater 3 is subjected to secondary heat recovery, so that the energy utilization efficiency is improved, and the influence of the system on the boiler efficiency is further reduced.
Through the arrangement of the waste water evaporation concentration device 6, the temperature of the flue gas at the inlet of the wet desulphurization device 7 is reduced, the humidity of the flue gas is improved, and the SO in the flue gas by the wet desulphurization device 7 can be improved2The absorption efficiency of the wet desulphurization device is improved, and the water replenishing of the wet desulphurization device is reduced.
The device for realizing zero emission of desulfurization wastewater by using the waste heat of flue gas further comprises a second dust remover 8, wherein an inlet flue of the second dust remover 8 is communicated with an outlet flue of the drying tower 4, and an outlet flue of the second dust remover 8 is communicated with an inlet flue of the first dust remover 5. The ash hoppers at the bottom of both the drying tower 4 and the second dust collector 8 are connected with a salt recovery device 14.
Through set up second dust remover 8 at drying tower 4 export, can carry out the entrapment to the chlorine containing crystallization product that desulfurization waste water evaporation was separated out to get into salinity recovery unit 14 with the lime-ash that the drying tower 4 bottom was discharged together, can prevent that the salt that separates out from going into main ash storehouse, reduce the influence to fly ash resourceization.
The first dust remover 5 is an electric dust remover, and the second dust remover 8 is a cyclone dust removal separator. The air intake of the second dust remover 8 is small, and the dust remover is a small dust remover.
In the present embodiment, a specific communication manner between the drying tower 4 and the main flue (the flue formed between the boiler, the SCR denitration reactor, the air preheater, the first dust collector, and the wet desulfurization device) is also provided.
And a first bypass flue is communicated with a flue between the SCR denitration reactor 2 and the air preheater 3, and an adjusting baffle is arranged on the first bypass flue and used for adjusting the amount of flue gas entering the bypass flue. And a second bypass flue is communicated with a flue between the air preheater 3 and the first dust remover 5, and an adjusting baffle is arranged on the second bypass flue and used for adjusting the amount of flue gas entering the bypass flue.
The outlet flue of the first bypass flue is communicated with the inlet flue of the drying tower 4, the outlet flue of the second bypass flue is communicated with the first bypass flue, and the connection point is positioned between the first bypass flue adjusting baffle and the drying tower 4.
The above is an embodiment in which the drying tower 4 is communicated with the main flue, and it is needless to say that the arrangement form of the first bypass flue and the second bypass flue may be appropriately changed according to the implementation requirement, as long as the extraction of the flue gas before entering the air preheater 3 or the flue gas exhausted from the air preheater 3 can be realized. For example, the first bypass stack and the second bypass stack may be two stacks arranged in parallel.
Flue gas discharged from the first dust remover 5 enters the wastewater evaporation concentration device 6 from the bottom, the wastewater evaporation concentration device 6 carries out concentration and decrement on the atomized desulfurization wastewater, and then the flue gas is discharged from the top of the wastewater evaporation concentration device and enters the wet desulphurization device 7. The specific composition structure of the wastewater evaporative concentration device 7 is as follows:
the waste water evaporation and concentration device 7 comprises a box body.
The inlet flue, the outlet flue, the water inlet and the water outlet of the waste water evaporation and concentration device 7 are communicated with the inner space of the box body. The outlet flue of the waste water evaporation and concentration device is positioned above the liquid level in the box body, and the inlet flue and the water outlet of the waste water evaporation and concentration device are both positioned below the liquid level.
The waste water evaporation and concentration device 7 with the structure can ensure that the flue gas entering the device can be fully contacted with the desulfurization waste water, and improve the utilization rate of the waste heat in the flue gas and the concentration degree of the waste water.
An inlet flue of the drying tower 4 is provided with an inlet baffle which adopts an adjusting execution structure and is used for adjusting the flow of hot flue gas entering the drying tower 4.
An outlet baffle is arranged in an outlet flue of the drying tower 4, and the outlet baffle adopts a switch type execution structure and is used for controlling the opening and closing of the outlet flue of the drying tower 4.
The drying tower 4 is a rotary spray drying tower, and a volute type air distributor and a rotary atomizer are arranged at the upper part of the drying tower 4.
The rotary atomizer is sleeved in the volute type air distributor, and the inlet end of the volute type air distributor is an inlet flue of the drying tower.
The inlet end of the rotary atomizer is a water inlet of the drying tower.
The structure of the matching of the rotary spray drying tower and the volute type air distributor enables the hot flue gas and atomized wastewater fog drops to fully exchange heat in the drying tower 4, and rapid drying is realized. Volute type air distributor can make the flue gas that gets into drying tower 4 form rotatory air current, and the waste water atomizing that rotatory atomizer will get into the drying tower becomes tiny fog drop, and flue gas and tiny fog drop contact evaporate the salt particle of separating out, and thick salt particle falls into the bottom of drying tower 4, and the air current that the tiny particle received gets into second dust remover 8, and the tiny particle finally falls into the bottom of second dust remover 8.
An intermediate water channel is arranged between the waste water evaporation and concentration device 6 and the drying tower 4. The intermediate waterway comprises a filter unit 11, a wastewater lift pump 12 and a high level wastewater tank 13.
The water inlet of the filtering device 11 is communicated with the water outlet of the waste water evaporation and concentration device 6, the water outlet of the filtering device 11 is communicated with the water inlet of the high-level waste water tank 13, the water outlet of the high-level waste water tank 13 is communicated with the water inlet of the drying tower 4, and the waste water lift pump 12 is arranged on a connecting pipeline between the high-level waste water tank 13 and the filtering device 11.
The desulfurized wastewater at the water outlet of the wastewater evaporation concentration device 6 enters a filtering device 11 to remove solid suspended substances in the wastewater, and Ca (OH) is added2The slurry is tempered to a pH of about 9-10, a wastewater lift pump 12 can provide power for conveying wastewater to the drying tower 4, and a high-level wastewater tank 13 is used for storing wastewater.
The wet desulphurization device 7 is also connected with a gypsum discharge device 10 for discharging gypsum in the wet desulphurization device 7.
In the embodiment, a method for realizing zero emission of desulfurization wastewater by using flue gas waste heat is also provided, and the method is based on the device for realizing zero emission of desulfurization wastewater by using flue gas waste heat. The specific description is as follows:
the desulfurization waste water passes through the waste water evaporation concentration device 6 of the first dust remover 5 to be concentrated and reduced to about 10 to 50 percent of the original desulfurization waste water, and the desulfurization waste water is discharged from the waste water evaporation concentration device 6The desulfurized wastewater at the water inlet enters a filtering device 11 to remove solid suspended substances in the wastewater, and Ca (OH) is added2The slurry is tempered to pH of about 9-10, and is atomized into fine fog drops through a rotary atomizer through a high-level wastewater tank 13 after being uniformly mixed, the fine fog drops are sprayed into a drying tower 4, hot flue gas between an SCR denitration reactor 2 and an air preheater 3 is used as a heat source for drying, and simultaneously low-temperature flue gas between the air preheater 3 and a first dust remover 5 is introduced as a secondary heat source; the flue gas at the outlet of the drying tower 4 passes through the second dust remover 8 to collect the salt particles separated by the evaporation of the waste water, and enters the salt recovery device 14 together with the ash discharged from the ash hopper at the bottom of the drying tower 4.
Wherein: the gas introduced into the drying tower 4 from the SCR denitration reactor 2 accounts for 1-3% of the total exhaust amount of the boiler; the gas introduced into the drying tower 4 by the air preheater 3 accounts for 3-5% of the total exhaust amount of the boiler.
In summary, the device and method for realizing zero emission of desulfurization wastewater by using flue gas waste heat provided by the embodiment have the following effects:
the desulfurization wastewater is concentrated and reduced to about 50 to 60 percent of the original wastewater amount by utilizing the medium-temperature flue gas (80 to 120 ℃) between the first dust remover 5 and the wet desulfurization device 7, the wastewater amount entering the drying tower 4 is reduced, the extracted hot flue gas amount is obviously reduced, and the influence of the system on the efficiency of the boiler 1 can be effectively reduced; simultaneously, the temperature of the flue gas at the inlet of the wet desulphurization device 7 is reduced, the humidity of the flue gas is improved, and the SO in the flue gas by the wet desulphurization device 7 can be improved2And the water supply of the wet desulfurization device 7 is reduced.
According to the invention, the flue gas behind the SCR denitration reactor 2 and the flue gas behind the air preheater 3 are simultaneously extracted to evaporate the wastewater, so that the system energy efficiency can be effectively improved.
Through set up second dust remover 8 at drying tower 4 export, can carry out the entrapment to the chlorine-containing crystallization product that desulfurization waste water evaporation was separated out to get into the salinity recovery system with the lime-ash of 4 bottoms discharge of drying tower together, can prevent to separate out during the salinity gets into main system flue gas, reduce the influence to fly ash resourceization.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides an utilize flue gas waste heat to realize device of desulfurization waste water zero release which characterized in that: the device comprises an SCR denitration reactor, an air preheater, a first dust remover, a wet desulphurization device and a drying tower which are sequentially connected through a flue;
the boiler, the SCR denitration reactor, the air preheater, the first dust remover and the wet desulphurization device are sequentially connected through a flue;
the outlet flue of the SCR denitration reactor and the outlet flue of the air preheater are both communicated with the inlet flue of the drying tower through bypass flues;
a waste water evaporation and concentration device is arranged between the first dust remover and the wet desulphurization device, and the wet desulphurization device is connected with a gypsum dehydration device;
the water inlet of the waste water evaporation concentration device is communicated with the water outlet of the gypsum dehydration device, and the water outlet of the waste water evaporation concentration device is communicated with the water inlet of the drying tower;
and an inlet flue of the wastewater evaporation concentration device is communicated with an outlet flue of the first dust remover, and an outlet flue of the wastewater evaporation concentration device is communicated with an inlet flue of the wet desulphurization device.
2. The device for realizing zero discharge of desulfurization wastewater by using flue gas waste heat according to claim 1, characterized in that: the inlet flue of the second dust remover is communicated with the outlet flue of the drying tower, and the outlet flue of the second dust remover is communicated with the inlet flue of the first dust remover;
and the ash hoppers at the bottoms of the drying tower and the second dust remover are connected with a salt recovery device.
3. The device for realizing zero discharge of desulfurization wastewater by using the waste heat of flue gas as claimed in claim 1, wherein the device comprises: a first bypass flue is communicated with a flue between the SCR denitration reactor and the air preheater, and an adjusting baffle is arranged on the first bypass flue and used for adjusting the amount of flue gas entering the bypass flue; a second bypass flue is communicated with a flue between the air preheater and the first dust remover, and an adjusting baffle is arranged on the second bypass flue and used for adjusting the amount of flue gas entering the bypass flue;
the outlet flue of the first bypass flue is communicated with the inlet flue of the drying tower, and the outlet flue of the second bypass flue is communicated with the first bypass flue.
4. The device for realizing zero discharge of desulfurization wastewater by using flue gas waste heat according to claim 1, characterized in that: the waste water evaporation and concentration device comprises a box body;
an inlet flue, an outlet flue, a water inlet and a water outlet of the wastewater evaporation and concentration device are all communicated with the inner space of the box body;
the outlet flue of the wastewater evaporation concentration device is positioned above the liquid level in the box body, and the inlet flue and the water outlet of the wastewater evaporation concentration device are both positioned below the liquid level.
5. The device for realizing zero discharge of desulfurization wastewater by using flue gas waste heat according to claim 1, characterized in that: an inlet flue of the drying tower is provided with an inlet baffle which adopts an adjusting execution structure;
and an outlet baffle is arranged in an outlet flue of the drying tower, and the outlet baffle adopts a switch-type execution structure.
6. The device for realizing zero discharge of desulfurization wastewater by using flue gas waste heat according to claim 1, characterized in that: the drying tower is a rotary spray drying tower;
the upper part of the drying tower is provided with a volute type air distributor and a rotary atomizer;
the rotary atomizer is sleeved in the volute type air distributor, and the inlet end of the volute type air distributor is an inlet flue of the drying tower;
the inlet end of the rotary atomizer is a water inlet of the drying tower.
7. The device for realizing zero discharge of desulfurization wastewater by using flue gas waste heat according to claim 1, characterized in that: an intermediate water path is arranged between the waste water evaporation and concentration device and the drying tower;
the middle waterway comprises a filtering device, a wastewater lifting pump and a high-level wastewater tank;
the water inlet of the filtering device is communicated with the water outlet of the wastewater evaporative concentration device, the water outlet of the filtering device is communicated with the water inlet of the high-level wastewater tank, the water outlet of the high-level wastewater tank is communicated with the water inlet of the drying tower, and the wastewater lifting pump is arranged on a connecting pipeline between the high-level wastewater tank and the filtering device.
8. A method for realizing zero emission of desulfurization wastewater by using flue gas waste heat, which is characterized in that the method is based on the device for realizing zero emission of desulfurization wastewater by using flue gas waste heat as claimed in any one of claims 1 to 7, and comprises the following steps:
concentrating the desulfurization wastewater by a wastewater evaporation concentration device after passing through a first dust remover, and spraying the concentrated desulfurization wastewater into a drying tower;
and introducing part of gas discharged by the SCR denitration reactor and the air preheater into the drying tower to be used as a heat source of the drying tower.
9. The method for realizing zero emission of desulfurization waste water by using waste heat of flue gas as claimed in claim 8,
the flue gas at the outlet of the drying tower passes through a second dust removal device to collect salt particles separated out by drying in the wastewater, and enters a recycling device together with ash discharged from an ash hopper at the bottom of the drying tower;
in the process of concentrating the desulfurization wastewater, finally concentrating and reducing the desulfurization wastewater to 10-50% of the original concentration;
before the concentrated desulfurization waste water is sprayed into the drying tower, the desulfurization waste water is filtered, and Ca (OH) is added2And (4) tempering the slurry to pH 9-10.
10. The method for realizing zero emission of desulfurization wastewater by using the waste heat of flue gas as claimed in claim 8, wherein the gas introduced into the drying tower by the SCR denitration reactor accounts for 1-3% of the total exhaust gas volume of the boiler;
the gas introduced into the drying tower by the air preheater accounts for 3-5% of the total exhaust amount of the boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010341892.7A CN111792690A (en) | 2020-04-27 | 2020-04-27 | Device and method for realizing zero discharge of desulfurization wastewater by using flue gas waste heat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010341892.7A CN111792690A (en) | 2020-04-27 | 2020-04-27 | Device and method for realizing zero discharge of desulfurization wastewater by using flue gas waste heat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111792690A true CN111792690A (en) | 2020-10-20 |
Family
ID=72806498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010341892.7A Pending CN111792690A (en) | 2020-04-27 | 2020-04-27 | Device and method for realizing zero discharge of desulfurization wastewater by using flue gas waste heat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111792690A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112499652A (en) * | 2020-10-30 | 2021-03-16 | 南京工业大学 | System and method for zero discharge of magnesium oxide desulfurization wastewater |
| CN112607944A (en) * | 2020-12-16 | 2021-04-06 | 中国华能集团清洁能源技术研究院有限公司 | Coal-fired power plant desulfurization wastewater treatment system and method based on flue gas cooperative treatment |
| CN112607945A (en) * | 2020-12-16 | 2021-04-06 | 中国华能集团清洁能源技术研究院有限公司 | Desulfurization wastewater zero-discharge system and method based on high-temperature and low-temperature flue gas coupling treatment |
| CN112624470A (en) * | 2020-12-16 | 2021-04-09 | 中国华能集团清洁能源技术研究院有限公司 | Desulfurization wastewater integrated treatment system and method based on high-temperature flue gas |
| CN113979501A (en) * | 2021-11-26 | 2022-01-28 | 南京诺克斯环保科技有限公司 | Utilize high temperature flue gas evaporation power plant's waste water to prevent stifled system |
| CN117521963A (en) * | 2023-11-14 | 2024-02-06 | 大唐环境产业集团股份有限公司 | Desulfurization wastewater bypass hot flue gas evaporation coal consumption influence evaluation method, device and medium |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001179047A (en) * | 1999-12-24 | 2001-07-03 | Toshiba Corp | Wastewater treatment facility |
| JP2015128754A (en) * | 2014-01-08 | 2015-07-16 | 三菱重工業株式会社 | Water treatment system and method |
| CN204550303U (en) * | 2015-03-11 | 2015-08-12 | 中国华电集团科学技术研究总院有限公司 | Desulfurization wastewater underload evaporation process system |
| CN105731574A (en) * | 2016-02-29 | 2016-07-06 | 河北省电力勘测设计研究院 | Evaporation treatment controlling method for wastewater from wet flue gas desulfurization |
| CN205556132U (en) * | 2016-02-29 | 2016-09-07 | 河北省电力勘测设计研究院 | Wet flue gas desulfurization waste water evaporating treatment device |
| CN106885252A (en) * | 2017-03-24 | 2017-06-23 | 东南大学 | A kind of saliferous high concentrated organic wastewater processing unit and method |
| CN206428024U (en) * | 2017-01-19 | 2017-08-22 | 四川苏源环保工程有限公司 | Waste water of heat-engine plant condensing crystallizing Zero discharging system |
| CN107697967A (en) * | 2017-10-11 | 2018-02-16 | 江苏中建材环保研究院有限公司 | A kind of Desulphurization for Coal-fired Power Plant wastewater zero discharge system and method |
| CN107739119A (en) * | 2017-11-28 | 2018-02-27 | 华电郑州机械设计研究院有限公司 | - kind of cascade utilization power-plant flue gas waste heat realizes the device of desulfurization wastewater zero-emission |
| CN109485117A (en) * | 2018-12-28 | 2019-03-19 | 大唐环境产业集团股份有限公司 | A kind of thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system and method |
| CN109607907A (en) * | 2018-10-17 | 2019-04-12 | 北京国电龙源环保工程有限公司 | A kind of desulfurization wastewater multi-heat source coupled processing system and processing method |
| CN110065978A (en) * | 2019-03-25 | 2019-07-30 | 罗天翔 | A kind of efficient gas distributor for high-salt wastewater rotary spraying and drying method |
| CN110316778A (en) * | 2019-07-19 | 2019-10-11 | 国电浙江北仑第一发电有限公司 | A kind of high-efficiency energy-saving desulfurizing Waste water concentrating processing unit |
| CN209493342U (en) * | 2018-12-15 | 2019-10-15 | 浙江浙能技术研究院有限公司 | A kind of flue gas distributor |
| CN110627146A (en) * | 2018-11-29 | 2019-12-31 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Desulfurization wastewater treatment system and desulfurization wastewater treatment method |
| CN212669260U (en) * | 2020-04-27 | 2021-03-09 | 大唐环境产业集团股份有限公司 | Device for realizing zero discharge of desulfurization wastewater by using flue gas waste heat |
-
2020
- 2020-04-27 CN CN202010341892.7A patent/CN111792690A/en active Pending
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001179047A (en) * | 1999-12-24 | 2001-07-03 | Toshiba Corp | Wastewater treatment facility |
| JP2015128754A (en) * | 2014-01-08 | 2015-07-16 | 三菱重工業株式会社 | Water treatment system and method |
| CN204550303U (en) * | 2015-03-11 | 2015-08-12 | 中国华电集团科学技术研究总院有限公司 | Desulfurization wastewater underload evaporation process system |
| CN105731574A (en) * | 2016-02-29 | 2016-07-06 | 河北省电力勘测设计研究院 | Evaporation treatment controlling method for wastewater from wet flue gas desulfurization |
| CN205556132U (en) * | 2016-02-29 | 2016-09-07 | 河北省电力勘测设计研究院 | Wet flue gas desulfurization waste water evaporating treatment device |
| CN206428024U (en) * | 2017-01-19 | 2017-08-22 | 四川苏源环保工程有限公司 | Waste water of heat-engine plant condensing crystallizing Zero discharging system |
| CN106885252A (en) * | 2017-03-24 | 2017-06-23 | 东南大学 | A kind of saliferous high concentrated organic wastewater processing unit and method |
| CN107697967A (en) * | 2017-10-11 | 2018-02-16 | 江苏中建材环保研究院有限公司 | A kind of Desulphurization for Coal-fired Power Plant wastewater zero discharge system and method |
| CN107739119A (en) * | 2017-11-28 | 2018-02-27 | 华电郑州机械设计研究院有限公司 | - kind of cascade utilization power-plant flue gas waste heat realizes the device of desulfurization wastewater zero-emission |
| CN109607907A (en) * | 2018-10-17 | 2019-04-12 | 北京国电龙源环保工程有限公司 | A kind of desulfurization wastewater multi-heat source coupled processing system and processing method |
| CN110627146A (en) * | 2018-11-29 | 2019-12-31 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Desulfurization wastewater treatment system and desulfurization wastewater treatment method |
| CN209493342U (en) * | 2018-12-15 | 2019-10-15 | 浙江浙能技术研究院有限公司 | A kind of flue gas distributor |
| CN109485117A (en) * | 2018-12-28 | 2019-03-19 | 大唐环境产业集团股份有限公司 | A kind of thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system and method |
| CN110065978A (en) * | 2019-03-25 | 2019-07-30 | 罗天翔 | A kind of efficient gas distributor for high-salt wastewater rotary spraying and drying method |
| CN110316778A (en) * | 2019-07-19 | 2019-10-11 | 国电浙江北仑第一发电有限公司 | A kind of high-efficiency energy-saving desulfurizing Waste water concentrating processing unit |
| CN212669260U (en) * | 2020-04-27 | 2021-03-09 | 大唐环境产业集团股份有限公司 | Device for realizing zero discharge of desulfurization wastewater by using flue gas waste heat |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112499652A (en) * | 2020-10-30 | 2021-03-16 | 南京工业大学 | System and method for zero discharge of magnesium oxide desulfurization wastewater |
| CN112607944A (en) * | 2020-12-16 | 2021-04-06 | 中国华能集团清洁能源技术研究院有限公司 | Coal-fired power plant desulfurization wastewater treatment system and method based on flue gas cooperative treatment |
| CN112607945A (en) * | 2020-12-16 | 2021-04-06 | 中国华能集团清洁能源技术研究院有限公司 | Desulfurization wastewater zero-discharge system and method based on high-temperature and low-temperature flue gas coupling treatment |
| CN112624470A (en) * | 2020-12-16 | 2021-04-09 | 中国华能集团清洁能源技术研究院有限公司 | Desulfurization wastewater integrated treatment system and method based on high-temperature flue gas |
| CN112624470B (en) * | 2020-12-16 | 2023-08-01 | 中国华能集团清洁能源技术研究院有限公司 | Desulfurization wastewater integrated treatment system and method based on high-temperature flue gas |
| CN113979501A (en) * | 2021-11-26 | 2022-01-28 | 南京诺克斯环保科技有限公司 | Utilize high temperature flue gas evaporation power plant's waste water to prevent stifled system |
| CN117521963A (en) * | 2023-11-14 | 2024-02-06 | 大唐环境产业集团股份有限公司 | Desulfurization wastewater bypass hot flue gas evaporation coal consumption influence evaluation method, device and medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111792690A (en) | Device and method for realizing zero discharge of desulfurization wastewater by using flue gas waste heat | |
| CN105152254B (en) | Coal fired power plant flue gas desulfurization waste water evaporating column processing system | |
| CN107032428B (en) | System and method for zero emission treatment of undersaturated flue gas concentration crystallization desulfurization wastewater | |
| CN107697967A (en) | A kind of Desulphurization for Coal-fired Power Plant wastewater zero discharge system and method | |
| CN106630358A (en) | Zero-release coupling humidifying dust-removing synergizing system and method for desulfurization wastewater | |
| CN104129824B (en) | Heat-engine plant desulfurized wastewater comprehensive treatment and dust granules thing discharge-reducing method | |
| CN108006683A (en) | A kind of method and apparatus that desulfurization wastewater zero-emission is realized using full flue gas | |
| CN111908696A (en) | Zero-discharge system and method for flue gas and water co-treatment of desulfurization wastewater | |
| CN208008493U (en) | A kind of equipment that flue residue heat is used for Waste Water From Fire Power Plant zero discharge treatment | |
| CN104085934B (en) | A kind of method of heat-engine plant desulfurized waste water high-efficiency spray evaporation nucleation | |
| CN111362342A (en) | Wastewater zero discharge system and method for multi-stage treatment | |
| CN103058435A (en) | Method for circularly processing hot boiler flue gas and desulfurization wastewater | |
| CN205011413U (en) | Coal fired power plant flue gas desulfurization effluent disposal system | |
| CN108529808A (en) | A kind of desulfurization wastewater treatment system and technique | |
| CN111072091A (en) | System and method for treating desulfurization wastewater by using flue gas waste heat | |
| CN206486391U (en) | A kind of desulfurization wastewater zero-emission couples damping Improvement of dust removal system | |
| CN107176742A (en) | A kind of desulfurization wastewater rotational flow dust-removing method | |
| CN108557930B (en) | The method comprises the following steps of: waste water from power plants processing device and method | |
| CN212669260U (en) | Device for realizing zero discharge of desulfurization wastewater by using flue gas waste heat | |
| CN208857076U (en) | A kind of desulfurization wastewater treatment system | |
| CN213942667U (en) | Flue gas and waste water's cooperative processing system | |
| CN104326498B (en) | Device utilizing high-temperature flue gas with high CO2 content to produce ultrafine active calcium powder and production method thereof | |
| CN112479293A (en) | Wastewater and flue gas waste heat drying system and method based on semi-dry desulfurization tower | |
| CN205156423U (en) | Exhaust purification and waste heat recovery use multipurposely system | |
| CN208898533U (en) | A kind of Zero discharging system of power plant desulfurization wastewater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |