CN111285423A - System and method for treating desulfurization concentrated tail solution - Google Patents
System and method for treating desulfurization concentrated tail solution Download PDFInfo
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- CN111285423A CN111285423A CN202010128071.5A CN202010128071A CN111285423A CN 111285423 A CN111285423 A CN 111285423A CN 202010128071 A CN202010128071 A CN 202010128071A CN 111285423 A CN111285423 A CN 111285423A
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 79
- 230000023556 desulfurization Effects 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000003546 flue gas Substances 0.000 claims abstract description 112
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 109
- 239000007788 liquid Substances 0.000 claims abstract description 83
- 239000002351 wastewater Substances 0.000 claims abstract description 73
- 238000001704 evaporation Methods 0.000 claims abstract description 46
- 230000008020 evaporation Effects 0.000 claims abstract description 41
- 238000002425 crystallisation Methods 0.000 claims abstract description 40
- 230000008025 crystallization Effects 0.000 claims abstract description 39
- 230000008569 process Effects 0.000 claims abstract description 11
- 238000005260 corrosion Methods 0.000 claims abstract description 6
- 230000007797 corrosion Effects 0.000 claims abstract description 6
- 239000007921 spray Substances 0.000 claims description 35
- 239000012530 fluid Substances 0.000 claims description 26
- 238000012544 monitoring process Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 239000000428 dust Substances 0.000 claims description 16
- 230000009467 reduction Effects 0.000 claims description 11
- 239000012141 concentrate Substances 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 10
- 239000003595 mist Substances 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 4
- 239000000779 smoke Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000000889 atomisation Methods 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 3
- 238000004065 wastewater treatment Methods 0.000 abstract description 5
- 238000006722 reduction reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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Abstract
The invention belongs to the technical field of desulfurization wastewater treatment, and particularly relates to a system and a method for treating desulfurization concentrated tail liquid. The system comprises a boiler tail flue system and a high-temperature bypass flue tail liquid treatment system, wherein a flue gas inlet flue at the top of a bypass evaporation crystallization tower in the high-temperature bypass flue tail liquid treatment system is communicated with an inlet of an air preheater of the boiler tail flue system; the invention solves the technical problems of zero discharge of concentrated solution of the desulfurization wastewater after concentration and decrement of the desulfurization wastewater treatment process and potential safety hazard caused by equipment corrosion and scaling due to contact of fog drops with walls in the evaporation process of the bypass flue.
Description
Technical Field
The invention belongs to the technical field of desulfurization wastewater treatment, and particularly relates to a system and a method for treating desulfurization concentrated tail liquid.
Background
In the face of huge pressure required by environmental protection policies and potential huge economic benefits of the desulfurization wastewater zero-discharge market, the desulfurization wastewater treatment process is in diversified development, such as a chemical method, a membrane concentration and reduction method, an electrodialysis method, a low-temperature multi-effect flash evaporation method, an evaporative crystallization method, a flue evaporation method and the like. Most processes are used for dry ash humidification, ash yard spraying and other process systems after desulfurization wastewater is subjected to decrement concentration, and zero emission of desulfurization wastewater is not really realized. The energy-saving and efficient desulfurization waste water concentrated tail liquid treatment technology is developed, and the method has great practical significance for accelerating the implementation process of waste water zero discharge of a power plant and realizing water saving, energy saving and environmental protection of the power plant.
Disclosure of Invention
The invention aims to provide a system and a method for treating desulfurization concentrated tail liquid, which aim to solve the technical problems of zero discharge of concentrated desulfurization wastewater after concentration and decrement of the conventional desulfurization wastewater treatment process and equipment corrosion, scaling and potential safety hazard caused by contact of fog drops with walls in the evaporation process of a bypass flue.
In order to achieve the purpose, the invention adopts the technical scheme that: a system for treating desulfurization concentrated tail liquid comprises a boiler tail flue system and a high-temperature bypass flue tail liquid treatment system, wherein a flue gas inlet flue at the top of a bypass evaporation crystallization tower in the high-temperature bypass flue tail liquid treatment system is communicated with an inlet of an air preheater of the boiler tail flue system; the boiler tail flue system is used for providing high-temperature flue gas at 270-350 ℃ for the high-temperature bypass flue tail liquid treatment system, and the high-temperature bypass flue tail liquid treatment system is used for carrying out atomization and evaporation on tail liquid after concentration and reduction.
The boiler tail flue system comprises a boiler tail flue, an SCR denitration system, an air preheater, a dust remover, a flue gas desulfurization tower and a chimney, wherein the SCR denitration system, the air preheater, the dust remover, the flue gas desulfurization tower and the chimney are sequentially installed from left to right.
The high-temperature bypass flue tail liquid treatment system comprises a desulfurization wastewater concentration and reduction system, a concentrated liquid buffer tank, a wastewater lift pump, at least one double-fluid spray gun, an air compressor, a bypass evaporative crystallization tower, a bypass flue gas inlet flue, a flue gas internal rectification system, a tower wall fog isolation system and a bypass flue gas outlet flue;
the tower wall mist separation system consists of a hot air inlet system and a radial air distribution system; and a third electric baffle door for adjusting the radial hot air flow is arranged on the hot air inlet system.
The flue gas internal rectification system is arranged at a flue gas inlet in the bypass evaporation crystallization tower; the double-fluid spray gun is arranged in a bypass evaporative crystallization tower just below the flue gas internal rectification system in a close manner, a compressed air inlet of the double-fluid spray gun is connected with an air source interface of an air compressor through a connecting pipeline, a concentrated tail liquid inlet of the double-fluid spray gun is connected with a water outlet of a wastewater lift pump through a connecting pipeline, a water inlet of the wastewater lift pump is connected with a water outlet of a concentrated liquid buffer tank through a connecting pipeline, and a water inlet of the concentrated liquid buffer tank is connected with a water outlet of a desulfurization wastewater concentration and reduction system through a connecting pipeline; a stirring device is arranged on the concentrated solution buffer tank;
the tower wall mist separation system is arranged at the middle lower part of the bypass evaporative crystallization tower; the bypass flue gas inlet flue is sequentially provided with a first electric damper for adjusting the flue gas flow and a flue gas flowmeter for monitoring the flue gas flow in real time, an inlet thermometer and an outlet thermometer are respectively arranged at the inlet and the outlet of the bypass evaporative crystallization tower, and the first electric damper is controlled in a linkage manner by establishing a function relation between the flue gas inlet and outlet temperatures and the waste water flow, so that the bypass flue gas flow is adjusted in real time; an electric valve for adjusting the flow of the wastewater, a liquid flow meter for measuring the flow of the concentrated solution in real time and a first pressure transmitter for measuring the pressure of the pipeline in real time are arranged on a connecting pipeline between the double-fluid spray gun and the wastewater lift pump and are linked with the second electric baffle door, the electric valve and the third electric baffle door so as to adjust the amount of compressed air and the amount of hot air according to the flow of the desulfurization wastewater concentrated solution; a second electric baffle door for adjusting the flow rate of the compressed air, a compressed air flow meter for monitoring the flow rate of the compressed air in real time and a second pressure transmitter for monitoring the pressure of the compressed air pipeline in real time are arranged on a connecting pipeline between the two-fluid spray gun and the air compressor, and the second electric baffle door and the second pressure transmitter are in linkage control with the liquid flow meter to match the amount of the compressed air with the amount of the concentrated liquid; a fourth electric baffle door is arranged on the bypass flue gas outlet flue and is used for emergency isolation of faults or other conditions inside the spraying system and the evaporation system;
as a preferred mode of the technical scheme, the bypass flue gas inlet flue is a double-turning-angle flue which is U-shaped and used for rectifying flue gas.
As a preferred mode of the technical scheme, the flue gas inner rectification system is of a disc-shaped porous structure and is used for uniformly distributing the flow and the flow direction of the flue gas at the inlet of the bypass evaporation crystallization tower.
As a preferred mode of the above technical scheme, the radial wind distribution system is of an annular structure and should be arranged near the position of the maximum dispersion point of the spray to generate radial wind force so as to prevent the fog drops from being sprayed to the tower wall to cause corrosion and scaling or bring potential safety hazards;
in a preferred mode of the above technical solution, the liquid flowmeter is an electromagnetic flowmeter for monitoring the flow rate of the desulfurization wastewater concentrate, and the range is 0 to 5m3H; the cigaretteGas flowmeter the flue gas flowmeter is target-type flowmeter for monitor high temperature flue gas's import flow, and the range is 0 ~ 20000m3/h。
In a preferred embodiment of the above technical solution, the compressed air flow meter is a vortex shedding meter for monitoring the compressed air flow, and the range is 0-300 m3/h。
As a preferable mode of the technical scheme, the first pressure transmitter and the second pressure transmitter are diaphragm pressure transmitters and are respectively used for monitoring the pressure of a water inlet pipeline and the pressure of a compressed air pipeline of the evaporator, and the measuring range is 0-1.6 MPa.
The method for treating the concentrated tail liquid of the desulfurization wastewater by using the system for treating the concentrated tail liquid of desulfurization comprises a concentration and decrement treatment stage and a spray evaporation treatment stage, and comprises the following specific steps:
firstly, when the operation is started, the electric baffle doors and the electric valves on all pipelines are in a closed state, and at the moment, high-temperature flue gas is discharged after sequentially passing through an SCR (selective catalytic reduction) denitration system, an air preheater, a dust remover, a flue gas desulfurization tower and a chimney which are arranged on a flue at the tail part of a boiler;
and secondly, conveying the desulfurization wastewater into a concentrated solution cache box after the desulfurization wastewater is treated by a concentration and decrement system, starting a stirring device, simultaneously opening a first electric baffle door, a second electric baffle door, an electric valve and a third electric baffle door, conveying the desulfurization wastewater concentrated solution to a double-fluid spray gun through a wastewater pipeline by a wastewater lifting pump, and measuring the flow of the concentrated solution in the wastewater pipeline to be Q when the desulfurization wastewater flows through a liquid flowmeter and a first pressure transmitter1Pressure of P1The data are fed back to the linkage control system in real time to regulate and control the first electric baffle door and the second electric baffle door in real time, and when the compressed air flowmeter displays data Q2＝190Q1Second pressure transmitter display data P2＝1.1P1When the control of the second electric baffle door is finished, compressed air enters the two-fluid spray gun to atomize the concentrated solution into liquid drops of 60-80 mu m and then the liquid drops are sprayed out; when the flue gas flowmeter displays data Q3＝10000Q1When the control is finished, the first electric baffle door is regulated and controlled, and the high-temperature flue gas enters the bypass evaporation crystallization tower to be atomizedEvaporating the liquid drops;
thirdly, in the evaporation process, the third electric baffle door is always opened, hot air enters the bypass evaporation crystallization tower through the tower wall fog isolation system to prevent fog drops from spraying to the tower wall, and the inlet temperature measuring instrument and the outlet temperature measuring instrument which are arranged on the bypass evaporation crystallization tower measure the inlet and outlet temperatures of the flue gas and are TInto、TGo outThe smoke is fed back to the linkage control system in real time, the first electric baffle door is further regulated and controlled in real time, and the flow of the inlet smoke is controlled to be Q3＝(1763657+1396TGo out)Q1/(TInto-TGo out) Continuously evaporating the desulfurization wastewater concentrated solution;
fourthly, the residual solid impurities after evaporation to dryness enter a dust remover through a bypass flue gas outlet flue to be captured and removed, and the flue gas is discharged after sequentially passing through a flue gas desulfurization tower and a chimney, so that zero emission of the desulfurization wastewater is finally realized;
and fifthly, when the high-temperature bypass flue tail liquid treatment system stops working, the liquid flowmeter displays 0, at the moment, the linkage control system closes the first electric baffle door, the second electric baffle door, the electric valve, the third electric baffle door and the fourth electric baffle door, and the high-temperature bypass flue tail liquid treatment system is isolated from the boiler tail flue system.
According to the invention, the boiler tail flue system and the high-temperature bypass flue tail liquid treatment system are effectively combined and arranged, high-temperature flue gas in front of the boiler tail flue air preheater is used as a heat source, atomized liquid drops are evaporated and crystallized in the bypass evaporation crystallization tower, and solid impurities left after water is evaporated to dryness enter the dust remover to be removed, so that zero emission of desulfurization wastewater is realized in a real sense, and the advantages of energy conservation and consumption reduction are achieved; meanwhile, the desulfurization wastewater is subjected to concentration and decrement treatment, so that the wastewater amount is greatly reduced, and the flue gas consumption is low; the U-shaped structure of the bypass flue gas inlet flue enables the flue gas at the inlet of the bypass evaporation crystallization tower to generate vortex, enhances the mixing degree of high-temperature flue gas and desulfurization wastewater, and is beneficial to rapid evaporation of fog drops; the flue gas internal rectification system has good uniform distribution effect on flue gas entering the bypass evaporative crystallization tower, further enhances the mixing effect of high-temperature flue gas and desulfurization wastewater, and further accelerates the evaporation rate of fog drops; the tower wall mist isolation system is creatively added into the bypass evaporation crystallization tower, so that the problems of equipment corrosion, scaling and potential safety hazards caused by spraying mist drops to the tower wall in the evaporation process of the bypass flue are effectively solved, and the method has higher popularization and application values.
Drawings
FIG. 1 is a schematic diagram of a system for treating a concentrated desulfurization tail solution according to the present invention;
FIG. 2 is a block diagram of the flue gas internal rectification system of the present invention;
FIG. 3 is a block diagram of the tower wall mist barrier system of the present invention;
in the figure, 1-boiler tail flue, 2-SCR denitration system, 3-air preheater, 4-dust remover, 5-flue gas desulfurization tower, 6-chimney, 7-desulfurization wastewater concentration and decrement system, 8-concentrated solution buffer tank, 9-wastewater lift pump, 10-double fluid spray gun, 11-air compressor, 12-bypass evaporative crystallization tower, 13-bypass flue gas inlet flue, 14-flue gas internal rectification system, 15-tower wall fog isolation system, 16-bypass flue gas outlet flue, 17-hot air inlet system, 18-radial air distribution system, 19-stirring device, 20-first electric baffle door, 21-second electric baffle door, 22-electric valve, 23-third electric baffle door, 24-fourth electric baffle door, 24-third electric baffle door, 23-fourth electric baffle door, 9-waste water lift pump, 10-double fluid spray gun, 11-air compressor, 12-bypass evaporative crystallization tower, 13-bypass flue gas inlet flue, 14, 25-inlet thermometer, 26-outlet thermometer, 27-liquid flowmeter, 28-first pressure transmitter, 29-compressed air flowmeter, 30-second pressure transmitter and 31-flue gas flowmeter.
Detailed Description
Referring to fig. 1 to 3, a system for treating a concentrated desulfurization tail liquid according to an embodiment of the present invention includes a boiler tail flue system and a high temperature bypass flue tail liquid treatment system, a flue gas inlet flue 13 at the top of a bypass evaporation crystallization tower 12 in the high temperature bypass flue tail liquid treatment system is communicated with an inlet of an air preheater 3 in the boiler tail flue system, and a flue gas outlet flue 16 at the bottom of the bypass evaporation crystallization tower 12 in the high temperature bypass flue tail liquid treatment system is communicated with a boiler tail flue 1 between the air preheater 3 and a dust remover 4 in the boiler tail flue system; the boiler tail flue system is used for providing high-temperature flue gas at 270-350 ℃ for the high-temperature bypass flue tail liquid treatment system, and the high-temperature bypass flue tail liquid treatment system is used for carrying out atomization and evaporation on tail liquid after concentration and reduction.
The boiler tail flue system comprises a boiler tail flue 1, an SCR denitration system 2, an air preheater 3, a dust remover 4, a flue gas desulfurization tower 5 and a chimney 6, wherein the SCR denitration system 2, the air preheater 3, the dust remover 4, the flue gas desulfurization tower 5 and the chimney 6 are sequentially arranged from left to right.
The high-temperature bypass flue tail liquid treatment system comprises a desulfurization wastewater concentration and reduction system 7, a concentrated liquid buffer tank 8, a wastewater lift pump 9, at least one double-fluid spray gun 10, an air compressor 11, a bypass evaporative crystallization tower 12, a bypass flue gas inlet flue 13, a flue gas internal rectification system 14, a tower wall fog isolation system 15 and a bypass flue gas outlet flue 16;
the tower wall mist separation system 15 consists of a hot air inlet system 17 and a radial air distribution system 18; and a third electric baffle door 23 for adjusting the radial hot air flow is arranged on the hot air inlet system 17.
The flue gas internal rectification system 14 is arranged at a flue gas inlet in the bypass evaporative crystallization tower 12; the double-fluid spray gun 10 is arranged in a bypass evaporative crystallization tower 12 right below a flue gas internal rectification system 14, a compressed air inlet of the double-fluid spray gun 10 is connected with an air source interface of an air compressor 11 through a connecting pipeline, a concentrated tail liquid inlet of the double-fluid spray gun 10 is connected with a water outlet of a wastewater lift pump 9 through a connecting pipeline, a water inlet of the wastewater lift pump 9 is connected with a water outlet of a concentrated liquid buffer tank 8 through a connecting pipeline, and a water inlet of the concentrated liquid buffer tank 8 is connected with a water outlet of a desulfurization wastewater concentration and reduction system 7 through a connecting pipeline; a stirring device 19 is arranged on the concentrated solution buffer tank 8;
the tower wall mist-isolating system 15 is arranged at the middle lower position of the bypass evaporative crystallization tower 12; a first electric damper 20 for adjusting the flow of the flue gas and a flue gas flowmeter 31 for monitoring the flow of the flue gas in real time are sequentially arranged on the bypass flue gas inlet flue 13, an inlet temperature measuring instrument 25 and an outlet temperature measuring instrument 26 are respectively arranged at the inlet and the outlet of the bypass evaporative crystallization tower 12, and the first electric damper 20 is controlled in a linkage manner to adjust the flow of the bypass flue gas in real time by establishing a functional relationship between the inlet and outlet temperatures of the flue gas and the flow of the wastewater; an electric valve 22 for adjusting the flow of the wastewater, a liquid flow meter 27 for measuring the flow of the concentrated solution in real time and a first pressure transmitter 28 for measuring the pressure of the pipeline in real time are arranged on a connecting pipeline between the double-fluid spray gun 10 and the wastewater lift pump 9 and are linked with the second electric baffle door 21, the electric valve 22 and the third electric baffle door 23 so as to adjust the amount of compressed air and the amount of hot air according to the flow of the desulfurization wastewater concentrated solution; a second electric baffle door 21 for adjusting the flow rate of the compressed air, a compressed air flow meter 29 for monitoring the flow rate of the compressed air in real time and a second pressure transmitter 30 for monitoring the pressure of the compressed air pipeline in real time are arranged on a connecting pipeline between the two-fluid spray gun 10 and the air compressor 11, and the second electric baffle door and the second pressure transmitter are in linkage control with the liquid flow meter 27 to match the amount of the compressed air with the amount of the concentrated liquid; a fourth electric baffle door 24 is arranged on the bypass flue gas outlet flue 16 and is used for emergency isolation of faults or other situations inside the spraying system and the evaporation system;
as a preferable mode of the above technical solution, the bypass flue gas inlet flue 13 is a double-turning-angle flue, is U-shaped, and is used for rectifying flue gas.
As a preferable mode of the above technical solution, the flue gas internal rectification system 14 is a disk-shaped porous structure, and is used for uniformly distributing the flow rate and the flow direction of the flue gas at the inlet of the bypass evaporation crystallization tower 12.
As a preferred mode of the above technical solution, the radial air distribution system 18 is an annular structure and should be arranged near the position of the maximum dispersion point of the spray to generate radial wind force, so as to prevent the spray droplets from spraying to the tower wall to cause corrosion and scaling or bring about potential safety hazards;
in a preferred embodiment of the above technical solution, the liquid flow meter 27 is an electromagnetic flow meter for monitoring the flow rate of the desulfurization wastewater concentrate, and the range is 0 to 5m3H; the flue gas flowmeter 31 is a target-type flowmeter and used for monitoring the inlet flow of high-temperature flue gas, and the measuring range is 0-20000 m3/h。
In a preferred embodiment of the above technical solution, the compressed air flowmeter 29 is a vortex flowmeter for monitoring the flow rate of compressed air, and the range is 0-300 m3/h。
In a preferred mode of the above technical solution, the first pressure transmitter 28 and the second pressure transmitter 30 are diaphragm pressure transmitters, and are respectively used for monitoring the pressures of the evaporator water supply pipeline and the compressed air pipeline, and the measuring range is 0 to 1.6 MPa.
The method for treating the concentrated tail liquid of the desulfurization wastewater by using the system for treating the concentrated tail liquid of the desulfurization wastewater comprises a concentration and decrement treatment stage and a spray evaporation treatment stage, and comprises the following specific steps:
firstly, when the operation is started, the electric baffle doors and the electric valves on all pipelines are in a closed state, and at the moment, high-temperature flue gas is discharged after sequentially passing through an SCR denitration system 2, an air preheater 3, a dust remover 4, a flue gas desulfurization tower 5 and a chimney 6 which are arranged on a tail flue 1 of a boiler;
secondly, the desulfurization wastewater is treated by a concentration and decrement system 7 and then sent into a concentrated solution buffer tank 8, a stirring device 19 is started, meanwhile, a first electric baffle door 20, a second electric baffle door 21, an electric valve 22 and a third electric baffle door 23 are all opened, a wastewater lifting pump 9 is used for conveying the desulfurization wastewater concentrated solution to a double-fluid spray gun 10 through a wastewater pipeline, and when the desulfurization wastewater flows through a liquid flowmeter 27 and a first pressure transmitter 28, the flow of the concentrated solution in the wastewater pipeline is measured to be Q1Pressure of P1Immediately feeding back to the linkage control system to regulate and control the first electric baffle door 20 and the second electric baffle door 21 in real time, and displaying data Q when the compressed air flowmeter 29 displays the data2＝190Q1Second pressure transmitter 30 displays data P2＝1.1P1When the control is finished, the second electric baffle door 21 is regulated, and compressed air enters the two-fluid spray gun 10 to atomize the concentrated solution into liquid drops of 60-80 mu m and spray the liquid drops; when the flue gas flowmeter 31 displays the data Q3＝10000Q1When the control is finished, the first electric baffle door 20 is regulated, and the high-temperature flue gas enters the bypass evaporation crystallization tower 12 to evaporate atomized liquid drops;
third, during evaporation, a third electrically operated flapper door23 is always opened, hot air enters the bypass evaporative crystallization tower 12 through the tower wall fog isolation system 15 to prevent fog drops from being sprayed to the tower wall, and the inlet temperature measuring instrument 25 and the outlet temperature measuring instrument 26 which are arranged on the bypass evaporative crystallization tower 12 measure the inlet and outlet temperature of flue gas as TInto、TGo outAnd the real-time feedback is carried out to the linkage control system, the first electric baffle door 20 is further regulated and controlled in real time, and the flow of the inlet flue gas is controlled to be Q3＝1763657+1396TGo outQ1/TInto-TGo outContinuously evaporating the desulfurization wastewater concentrated solution;
fourthly, the residual solid impurities after evaporation enter a dust remover 4 through a bypass flue gas outlet flue 16 to be captured and removed, and the flue gas is discharged after sequentially passing through a flue gas desulfurization tower 5 and a chimney 6, so that zero discharge of the desulfurization wastewater is finally realized;
and fifthly, when the high-temperature bypass flue tail liquid treatment system stops working, the liquid flow meter 27 shows 0, at the moment, the linkage control system closes the first electric baffle door 20, the second electric baffle door 21, the electric valve 22, the third electric baffle door 23 and the fourth electric baffle door 24, and the high-temperature bypass flue tail liquid treatment system is isolated from the boiler tail flue system.
Claims (10)
1. A system for treating desulfurization concentrated tail liquid is characterized in that: the system is composed of a boiler tail flue system and a high-temperature bypass flue tail liquid treatment system, wherein a flue gas inlet flue (13) at the top of a bypass evaporation crystallization tower (12) in the high-temperature bypass flue tail liquid treatment system is communicated with an inlet of an air preheater (3) in the boiler tail flue system, and a flue gas outlet flue (16) at the bottom of the bypass evaporation crystallization tower (12) in the high-temperature bypass flue tail liquid treatment system is communicated with a boiler tail flue (1) between the air preheater (3) and a dust remover (4) in the boiler tail flue system; the boiler tail flue system is used for providing high-temperature flue gas at 270-350 ℃ for the high-temperature bypass flue tail liquid treatment system, and the high-temperature bypass flue tail liquid treatment system is used for carrying out atomization and evaporation on tail liquid after concentration and reduction.
2. The system for treating desulfurization concentrate tailings of claim 1, wherein: the boiler tail flue system comprises a boiler tail flue (1), an SCR denitration system (2), an air preheater (3), a dust remover (4), a flue gas desulfurization tower (5) and a chimney (6), wherein the SCR denitration system (2), the air preheater (3), the dust remover (4), the flue gas desulfurization tower (5) and the chimney (6) are sequentially installed from left to right.
3. The system for treating desulfurization concentrate tailings of claim 1, wherein: the high-temperature bypass flue tail liquid treatment system comprises a desulfurization wastewater concentration and reduction system (7), a concentrated liquid buffer tank (8), a wastewater lift pump (9), at least one double-fluid spray gun (10), an air compressor (11), a bypass evaporation crystallization tower (12), a bypass flue gas inlet flue (13), a flue gas internal rectification system (14), a tower wall mist isolation system (15) and a bypass flue gas outlet flue (16);
the tower wall mist separation system (15) consists of a hot air inlet system (17) and a radial air distribution system (18); and a third electric baffle door (23) for adjusting the radial hot air flow is arranged on the hot air inlet system (17).
The flue gas internal rectification system (14) is arranged at a flue gas inlet in the bypass evaporative crystallization tower (12); the double-fluid spray gun (10) is arranged in a bypass evaporative crystallization tower (12) which is arranged right below a flue gas internal rectification system (14) in a close manner, a compressed air inlet of the double-fluid spray gun (10) is connected with an air source interface of an air compressor (11) through a connecting pipeline, a concentrated tail liquid inlet of the double-fluid spray gun (10) is connected with a water outlet of a wastewater lift pump (9) through a connecting pipeline, a water inlet of the wastewater lift pump (9) is connected with a water outlet of a concentrated liquid buffer tank (8) through a connecting pipeline, and a water inlet of the concentrated liquid buffer tank (8) is connected with a water outlet of a desulfurization wastewater concentration and reduction system (7) through a connecting pipeline; a stirring device (19) is arranged on the concentrated solution buffer tank (8);
the tower wall mist separation system (15) is arranged at the middle lower part of the bypass evaporative crystallization tower (12); a first electric damper (20) for adjusting the flow of the flue gas and a flue gas flowmeter (31) for monitoring the flow of the flue gas in real time are sequentially arranged on the bypass flue gas inlet flue (13), an inlet thermometer (25) and an outlet thermometer (26) are respectively arranged at the inlet and the outlet of the bypass evaporative crystallization tower (12), and the first electric damper (20) is controlled in a linkage manner to adjust the flow of the bypass flue gas in real time by establishing a functional relationship between the inlet and outlet temperatures of the flue gas and the flow of the wastewater; an electric valve (22) for adjusting the flow of the wastewater, a liquid flow meter (27) for measuring the flow of the concentrated solution in real time and a first pressure transmitter (28) for measuring the pressure of the pipeline in real time are arranged on a connecting pipeline between the double-fluid spray gun (10) and the wastewater lift pump (9), and are linked with a second electric baffle door (21), the electric valve (22) and a third electric baffle door (23) so as to adjust the amount of compressed air and the amount of hot air according to the flow of the concentrated solution of the desulfurization wastewater; a second electric baffle door (21) for adjusting the flow rate of the compressed air, a compressed air flow meter (29) for monitoring the flow rate of the compressed air in real time and a second pressure transmitter (30) for monitoring the pressure of the compressed air pipeline in real time are arranged on a connecting pipeline between the two-fluid spray gun (10) and the air compressor (11), and the second electric baffle door and the second pressure transmitter are linked with the liquid flow meter (27) to control the amount of the compressed air to be matched with the amount of the concentrated liquid; and a fourth electric baffle door (24) is arranged on the bypass flue gas outlet flue (16) and is used for emergency isolation of faults or other conditions inside the spraying system and the evaporation system.
4. The system for treating desulfurization concentrate tailings of claim 3, wherein: the bypass flue gas inlet flue (13) is a double-turning-angle flue which is U-shaped and used for rectifying flue gas.
5. The system for treating desulfurization concentrate tailings of claim 3, wherein: the flue gas inner rectification system (14) is of a disc-shaped porous structure and is used for uniformly distributing the flow and the flow direction of flue gas at the inlet of the bypass evaporation crystallization tower (12).
6. The system for treating desulfurization concentrate tailings of claim 3, wherein: the radial air distribution system (18) is of an annular structure and is arranged near the position of the maximum dispersion point of the spray to generate radial wind force so as to prevent fog drops from being sprayed to the tower wall to cause corrosion and scaling or bring potential safety hazards.
7. The system for treating desulfurization concentrate tailings of claim 3, wherein: the liquid flowmeter (27) is an electromagnetic flowmeter and is used for monitoring the flow of the desulfurization wastewater concentrated solution, and the measuring range is 0-5 m3H; the flue gas flowmeter (31) is a target-type flowmeter and used for monitoring the inlet flow of high-temperature flue gas, and the measuring range is 0-20000 m3/h。
8. The system for treating desulfurization concentrate tailings of claim 3, wherein: the compressed air flowmeter (29) is a vortex shedding flowmeter and is used for monitoring the flow of compressed air, and the measuring range is 0-300 m3/h。
9. The system for treating desulfurization concentrate tailings of claim 3, wherein: the first pressure transmitter (28) and the second pressure transmitter (30) are diaphragm pressure transmitters and are respectively used for monitoring the pressure of a water inlet pipeline and the pressure of a compressed air pipeline of the evaporator, and the measuring range is 0-1.6 MPa.
10. A method for treating concentrated tail liquid of desulfurization wastewater by using the system for treating the concentrated tail liquid of desulfurization is characterized by comprising a concentration and decrement treatment stage and a spray evaporation treatment stage, and comprises the following specific steps:
firstly, when the operation is started, electric baffle doors and electric valves on all pipelines are in a closed state, and at the moment, high-temperature flue gas is discharged after sequentially passing through an SCR denitration system (2), an air preheater (3), a dust remover (4), a flue gas desulfurization tower (5) and a chimney (6) which are arranged on a tail flue (1) of a boiler;
secondly, the desulfurization wastewater is sent into a concentrated solution buffer tank (8) after being treated by a concentration and decrement system (7), a stirring device (19) is started, meanwhile, a first electric baffle door (20), a second electric baffle door (21), an electric valve (22) and a third electric baffle door (23) are all opened, and a wastewater lifting pump (9) is used for enabling the desulfurization wastewater concentrated solution to pass through a wastewater pipeThe concentrated solution is conveyed to a double-fluid spray gun (10) and flows through a liquid flowmeter (27) and a first pressure transmitter (28), and the flow of the concentrated solution in the waste water pipeline is measured to be Q1Pressure of P1The real-time feedback is carried out to the linkage control system to regulate and control the first electric baffle door (20) and the second electric baffle door (21) in real time, and when the compressed air flowmeter (29) displays data Q2＝190Q1The second pressure transmitter (30) displays data P2＝1.1P1When the control is finished, the second electric baffle door (21) is regulated, and compressed air enters the two-fluid spray gun (10) to atomize the concentrated solution into liquid drops of 60-80 mu m and spray the liquid drops; when the flue gas flowmeter (31) displays data Q3＝10000Q1When the control is finished, the first electric baffle door (20) is regulated, and the high-temperature flue gas enters the bypass evaporation crystallization tower (12) to evaporate atomized liquid drops;
thirdly, in the evaporation process, the third electric baffle door (23) is always opened, hot air enters the bypass evaporation crystallization tower (12) through the tower wall fog-proof system (15) to prevent fog drops from being sprayed to the tower wall, and the inlet temperature measuring instrument (25) and the outlet temperature measuring instrument (26) which are arranged on the bypass evaporation crystallization tower (12) measure the inlet and outlet temperatures of the flue gas as TInto、TGo outThe smoke is fed back to the linkage control system in real time, and the first electric baffle door (20) is further regulated and controlled in real time to control the inlet smoke flow to be Q3＝(1763657+1396TGo out)Q1/(TInto-TGo out) Continuously evaporating the desulfurization wastewater concentrated solution;
fourthly, residual solid impurities after evaporation enter a dust remover (4) through a bypass flue gas outlet flue (16) to be captured and removed, and the flue gas is discharged after sequentially passing through a flue gas desulfurization tower (5) and a chimney (6), so that zero emission of desulfurization wastewater is finally realized;
and fifthly, when the high-temperature bypass flue tail liquid treatment system stops working, the liquid flow meter (27) shows 0, and at the moment, the linkage control system closes the first electric baffle door (20), the second electric baffle door (21), the electric valve (22), the third electric baffle door (23) and the fourth electric baffle door (24), so that the high-temperature bypass flue tail liquid treatment system is isolated from the boiler tail flue system.
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