CN211946337U - Intelligent waste water zero discharge coupling dechlorination system utilizing waste heat of flue gas - Google Patents
Intelligent waste water zero discharge coupling dechlorination system utilizing waste heat of flue gas Download PDFInfo
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- CN211946337U CN211946337U CN201922481600.5U CN201922481600U CN211946337U CN 211946337 U CN211946337 U CN 211946337U CN 201922481600 U CN201922481600 U CN 201922481600U CN 211946337 U CN211946337 U CN 211946337U
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Abstract
The utility model relates to an intelligent waste water zero discharge coupling dechlorination system for flue gas waste heat utilization, which is used in cooperation with a flue gas dust removal and desulfurization system and comprises a waste water dechlorination device, a control mechanism and a sensing mechanism, wherein the control mechanism and the sensing mechanism are respectively connected with the waste water dechlorination device and the control mechanism is connected with the sensing mechanism; the wastewater dechlorination device comprises a wastewater pretreatment device used for removing suspended matters from the desulfurization wastewater and adjusting the pH value, a concentration and decrement device used for concentrating the desulfurization wastewater, and an evaporation dechlorination and dust removal device used for evaporating the concentrated wastewater and removing solid products. The utility model discloses owing to adopt concentrated decrement device and evaporation dechlorination dust collector, chloride ion gets into waste water concentration system and desulfurization system again along with outer arranging of flue gas when can reducing waste water evaporation, realizes the source emission reduction of waste water.
Description
Technical Field
The utility model belongs to the technical field of energy environmental engineering pollution emission reduction, especially, relate to an intelligent waste water zero release coupling dechlorination system of flue gas waste heat utilization.
Background
Chlorine elements from fire coal, limestone and process water are continuously enriched in the desulfurization slurry, and in order to prevent equipment corrosion and abrasion, the limestone-gypsum wet desulfurization tower needs to periodically supplement the process water and discharge desulfurization wastewater so as to control the concentration of chloride ions in the desulfurization slurry. Aiming at the problem of water pollution, the state department issues policy regulations such as 'action plan for water pollution prevention and control', 'technical policy for pollution prevention and control of thermal power plants', and the like, and the state strengthens the treatment strength on various water pollutions, and requires that the power plants treat various types of waste water according to water quality in a classified manner, and under normal conditions, all the waste water after treatment should be recycled or comprehensively utilized to encourage the thermal power plants to realize the recycling of the waste water without discharge. The desulfurization wastewater has high suspended matter content, complex water quality, heavy metal content and great treatment difficulty, and the traditional chemical precipitation method for treating the desulfurization wastewater is difficult to remove chloride ions in the wastewater, so that the desulfurization wastewater cannot be recycled or directly discharged.
The flue evaporation technology utilizes a high-efficiency atomizing nozzle to atomize the desulfurization wastewater into small liquid drops to be directly sprayed into a flue between an air preheater and a dust remover or adopts an independently arranged evaporation tower, high-temperature flue gas before a certain air preheater is introduced to dry the desulfurization wastewater, and the wastewater is completely evaporated by utilizing the waste heat of the flue gas, so that pollutants in the wastewater are converted into solid crystals or salts which are captured and collected in the dust remover along with fly ash, and zero emission of the desulfurization wastewater is realized. However, the waste water evaporation product contains high chloride and heavy metals, which can cause the ash quality of the dust removal system to be reduced and even cause the dust removal ash to become dangerous waste.
Chinese patent CN 204185326U provides a desulfurization waste water zero release processing system, including waste water pretreatment equipment, evaporative concentration equipment and evaporative crystallization equipment, through the processing of equipment, the final product is distilled water and crystal salt, reduces the emission of harmful substance, but evaporative crystallization technology has the requirement to the purity of crystal salt, needs to carry out deep pretreatment to desulfurization waste water, follow-up membrane concentration and evaporative crystallization operating mode need get rid of turbidity, scaling nature material, Chemical Oxygen Demand (COD), the product magnesium hydroxide that the softening generated is flocculent colloid, difficult sediment, hardly filtration separation, bring the difficulty for the technology operation, the working cost is higher simultaneously, the partial running cost of evaporative crystallization accounts for 45% of total running cost approximately. The system must discharge a small amount of salt-containing water or sludge, and the product crystalline salt obtained in the wastewater treatment is difficult to be commercially utilized or needs to be treated as solid waste.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of prior art existence, improve the waste water treatment technique, the utility model provides a flue gas waste heat utilization's intelligent waste water zero release coupling dechlorination system.
In order to achieve the purpose, the utility model provides a technical scheme does:
the utility model relates to an utilize intelligent waste water zero release coupling dechlorination system of flue gas waste heat, use with the cooperation of flue gas dust removal desulfurization system, flue gas dust removal desulfurization system include by flue gas duct connected gradually dry-type electrostatic precipitator, draught fan and desulfurizing tower, it includes the waste water dechlorination device that is arranged in realizing the waste water dechlorination through boiler flue gas waste heat, the control mechanism who is arranged in controlling waste water dechlorination device operation and is arranged in monitoring waste water dechlorination device flue gas and the sensing mechanism of waste water information, control mechanism and sensing mechanism be connected with waste water dechlorination device respectively, control mechanism is connected with sensing mechanism; the wastewater dechlorination device comprises a wastewater pretreatment device used for removing suspended matters from the desulfurization wastewater and adjusting the pH value, a concentration and decrement device used for concentrating the desulfurization wastewater, and an evaporation dechlorination and dust removal device used for evaporating the concentrated wastewater and removing solid products.
Preferably, the flue gas flue comprises a front-end flue of the dry electric dust remover and a front-end flue of the desulfurizing tower, a smoke inlet of the dry electric dust remover is communicated with the front-end flue of the dry electric dust remover, and a smoke outlet of the dry electric dust remover is communicated with the front-end flue of the desulfurizing tower through an induced draft fan; the waste water pretreatment device be connected with desulfurizing tower and concentrated decrement device respectively, evaporation dechlorination dust collector's smoke inlet and dry-type electrostatic precipitator front end flue and desulfurizing tower front end flue intercommunication, evaporation dechlorination dust collector's outlet and concentrated decrement device's smoke inlet intercommunication, evaporation dechlorination dust collector's smoke inlet department is equipped with concentrated waste water import.
Preferably, the control mechanism comprises a control device, a delivery pump for delivering fresh wastewater, a discharge pump for discharging concentrated wastewater, an electric regulating valve for compressing air, a variable frequency pump for wastewater circulation, a first electric baffle door, a second electric baffle door and a third electric baffle door for opening and closing boiler flue gas extraction, wherein the delivery pump, the discharge pump, the electric regulating valve, the variable frequency pump, the first electric baffle door, the second electric baffle door and the third electric baffle door are connected with the control device.
Preferably, the sensing mechanism including be arranged in the concentrated decrement device of monitoring waste water solid content monitoring devices, be used for monitoring the first flue gas parameter monitoring devices of desulfurizing tower entry flue gas, be used for monitoring the second flue gas parameter monitoring devices of dry-type electrostatic precipitator entry flue gas, be used for monitoring the third flue gas parameter monitoring devices and the fourth flue gas parameter monitoring devices of concentrated decrement device business turn over flue, waste water solid content monitoring devices, first flue gas parameter monitoring devices, second flue gas parameter monitoring devices, third flue gas parameter monitoring devices and fourth flue gas parameter monitoring devices are connected with controlling means respectively.
Preferably, the evaporation dechlorination dust removal device comprises a double-fluid spray gun, a bag type dust collector, a first evaporation flue and a second evaporation flue; one end of the bag type dust collector is provided with a first smoke inlet and a second smoke inlet, the other end of the bag type dust collector is provided with a first smoke outlet, the first smoke inlet is communicated with a flue at the rear end of the induced draft fan through a first evaporation flue, and the second smoke inlet is communicated with a flue at the front end of the dry type electric dust collector through a second evaporation flue; the double-fluid spray gun is arranged in the first evaporation flue and is connected with the wastewater inlet, and the first electric baffle door is arranged at the smoke inlet end of the first evaporation flue; and the second electric baffle door is arranged at the smoke inlet end of the second evaporation flue.
Preferably, the concentration and decrement device consists of an evaporation concentration tower, a variable frequency spraying layer, an extractable liquid drop catcher and a wastewater concentration pool, wherein the wastewater concentration pool is arranged at the bottom of the evaporation concentration tower, the variable frequency spraying layer and the extractable liquid drop catcher are arranged in the evaporation concentration tower, and the extractable liquid drop catcher is positioned above the variable frequency spraying layer; the lower part of the evaporation concentration tower is provided with a third smoke inlet, the top of the evaporation concentration tower is provided with a second smoke outlet, the third smoke inlet is communicated with the first smoke outlet through a smoke inlet flue, and the second smoke outlet is communicated with a front end flue of the desulfurizing tower through a smoke outlet flue; the wastewater concentration tank is connected with the variable-frequency spraying layer through a variable-frequency pump, the wastewater concentration tank is connected with the wastewater inlet through a discharge pump, and the wastewater concentration tank is connected with the wastewater pretreatment device through a delivery pump; the first flue gas parameter monitoring device is arranged on a flue at the rear end of the induced draft fan; the second flue gas parameter monitoring device is arranged on a front-end flue of the dry electric dust remover; the third flue gas parameter monitoring device is installed on the flue inlet of the evaporation concentration tower, the fourth flue gas parameter monitoring device is installed on the flue outlet of the evaporation concentration tower, the waste water solid content monitoring device is arranged in the waste water concentration tank, the electric regulating valve is installed on a pipeline between the discharge pump and the double-fluid spray gun, and the third electric baffle door is installed at the flue outlet end of the flue outlet.
Preferably, the spraying angle of the two-fluid spray gun relative to the first evaporation flue is 30-60 degrees, the spraying speed is 20-60 m/s, and the atomized particle size is 30-80 μm.
Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:
1. the utility model adopts the concentration and decrement device and the evaporation dechlorination and dust removal device, so that the phenomenon that chloride ions enter the wastewater concentration system and the desulfurization system again along with the discharge of flue gas during the evaporation of wastewater can be reduced, and the source emission reduction of wastewater is realized; meanwhile, the concentrated waste water evaporation byproducts are high-chlorine-salt-content and heavy metal-content substances which are collected by an independently-operated high-efficiency bag type dust collector, so that the ash quality of the original dust removal system is prevented from being reduced.
2. The control mechanism of the utility model adjusts and extracts the flue gas flow for concentrating and evaporating the waste water according to the waste water treatment capacity; and meanwhile, the concentrated wastewater injection amount of the double-fluid spray gun is adjusted according to the load of the boiler, so that the high-efficiency stable safe operation of the whole system is realized.
3. The utility model discloses a sensing mechanism can monitor the flue gas of flue gas flue in real time, and the flue gas and the concentrated decrement device waste water of concentrated decrement device business turn over flue contain solid volume to feed back information to control mechanism, control mechanism controls actual motion device.
4. The main pollutants in the desulfurization wastewater of the utility model are heavy metal salt and CaCl2Form C1-In the process of evaporating the liquid drops of the desulfurization wastewater, almost all particles generated by crystallization of the chlorine-containing salt and the heavy metal salt are captured by the bag type dust collector and enter dry ash, so that the circulating accumulation of pollutants is avoided.
Drawings
FIG. 1 is a system flow diagram of the present invention;
FIG. 2 is a layout of a dual fluid spray gun within a first evaporation flue;
1-a wastewater dechlorination device; 2-a control mechanism; 3-a sensing mechanism; 4-flue gas flue; 5-dry electric dust collector; 6-induced draft fan; 7-a desulfurizing tower; 11-a wastewater pretreatment device; 12-a concentration and decrement device; 13-an evaporation dechlorination dust removal device; 21-a control device; 22-a delivery pump; 23-a discharge pump; 24-an electric regulating valve; 25-a variable frequency pump; 26-a first electrically powered flapper door; 27-a second electrically powered flapper door; 28-a third electrically powered flapper door; 31-a wastewater solid content monitoring device; 32-a first flue gas parameter monitoring device; 33-a second flue gas parameter monitoring device; 34-a third flue gas parameter monitoring device; 35-a fourth flue gas parameter monitoring device; 41-front end flue of dry electric dust collector; 42-front flue of desulfurizing tower; 121-an evaporation concentration tower; 122-variable frequency spraying layer; 123-removable drop catcher; 124-a wastewater concentration tank; 125-third inlet; 126-a second smoke outlet; 127-enter the flue; 128-out flue; 131-a two-fluid spray gun; 132-a bag house; 133-a first evaporation flue; 134-a second evaporation flue; 135-a first smoke outlet; 136-a first smoke inlet; 137-second smoke inlet.
Detailed Description
For further understanding of the present invention, the present invention will be described in detail with reference to the following examples, which are provided for illustration of the present invention but are not intended to limit the scope of the present invention.
As shown in figure 1, two 220t/h cogeneration units of a certain thermal power plant adopt a limestone-gypsum wet flue gas dust removal and desulfurization system, the two boiler waste water production amounts are 3.5t/h, the flue gas dust removal and desulfurization system comprises a dry electric dust remover 5, an induced draft fan 6 and a rear-end desulfurization tower 7, and a flue gas flue 4 is sequentially connected with the front-end dry electric dust remover 5, the induced draft fan 6 and the rear-end desulfurization tower 7.
The embodiment relates to an intelligent wastewater zero-discharge coupling dechlorination system utilizing flue gas waste heat, which comprises a wastewater dechlorination device 1 for realizing wastewater dechlorination through the flue gas waste heat of a boiler, a control mechanism 2 for controlling the operation of the wastewater dechlorination device 1 and a sensing mechanism 3 for monitoring flue gas and wastewater information in the wastewater dechlorination device 1, wherein the control mechanism 2 and the sensing mechanism 3 are respectively connected with the wastewater dechlorination device 1, and the control mechanism 2 is connected with the sensing mechanism 3; the wastewater dechlorinating device 1 comprises a wastewater pretreatment device 11 for removing suspended matters from the desulfurization wastewater and adjusting the pH value, a concentration and decrement device 12 for concentrating the desulfurization wastewater, and an evaporation dechlorination and dust removal device 13 for evaporating the concentrated wastewater and removing solid products.
The flue gas flue 4 comprises a front-end flue 41 of the dry electric dust remover and a front-end flue 42 of the desulfurizing tower, a smoke inlet of the dry electric dust remover 5 is communicated with the front-end flue 41 of the dry electric dust remover, and a smoke outlet of the dry electric dust remover 5 is communicated with the front-end flue 42 of the desulfurizing tower through an induced draft fan; the waste water pretreatment device 11 be connected with desulfurizing tower 7 and concentrated deweighting device 12 respectively, evaporation dechlorination dust collector 13's smoke inlet and dry-type electrostatic precipitator front end flue 41 and desulfurizing tower front end flue 42 intercommunication, evaporation dechlorination dust collector 13's outlet and concentrated deweighting device 12's smoke inlet intercommunication, concentrated deweighting device 12's outlet and desulfurizing tower front end flue 42 intercommunication, concentrated deweighting device 12's waste water export and evaporation dechlorination dust collector's smoke inlet intercommunication.
The control mechanism 2 comprises a control device 21, a delivery pump 22 for delivering fresh wastewater, a discharge pump 23 for discharging concentrated wastewater, an electric regulating valve 24 for compressing air, a variable frequency pump 25 for circulating wastewater, a first electric baffle door 26, a second electric baffle door 27 and a third electric baffle door 28 for opening and closing boiler flue gas extraction, wherein the delivery pump 22, the discharge pump 23, the electric regulating valve 24, the variable frequency pump 25, the first electric baffle door 26, the second electric baffle door 27 and the third electric baffle door 28 are connected with the control device 21.
Sensing mechanism 3 including the waste water that is arranged in monitoring concentrated decrement device 12 waste water contain solid monitoring devices 31, a first flue gas parameter monitoring devices 32 for monitoring 7 entry flue gases in desulfurizing tower, a second flue gas parameter monitoring devices 33 for monitoring 5 entry flue gases in dry-type electrostatic precipitator, a third flue gas parameter monitoring devices 34 and a fourth flue gas parameter monitoring devices 35 for monitoring concentrated decrement device 12 business turn over flues, waste water contains solid monitoring devices 31, first flue gas parameter monitoring devices 32, second flue gas parameter monitoring devices 33, third flue gas parameter monitoring devices 34 and fourth flue gas parameter monitoring devices 35 and is connected with controlling means 21 respectively.
The evaporation dechlorination dust removal device 13 comprises a double-fluid spray gun 131, a bag type dust collector 132, a first evaporation flue 133 and a second evaporation flue 134; one end of the bag type dust collector 132 is provided with a first smoke inlet 136 and a second smoke inlet 137, the other end of the bag type dust collector is provided with a first smoke outlet 135, the first smoke inlet 136 is communicated with a flue at the rear end of the induced draft fan 6 through a first evaporation flue 133, the second smoke inlet 137 is communicated with a flue 41 at the front end of the dry type electric dust collector through a second evaporation flue 134, the two-fluid spray gun 131 is vertically arranged in the first evaporation flue 133 at the position of 0.8 meter at the front end of the bag type dust collector 132 and is in reverse contact with the extracted evaporation smoke, and the flow rate of the evaporation smoke extracted by the first evaporation flue 133 is 4.5 m/s; the proportion of the flue gas in the evaporation flue gas source 4 extracted by the first evaporation flue 133 is 25%, the first electric baffle door 26 is arranged at the smoke inlet end of the first evaporation flue 133, and the second electric baffle door 27 is arranged at the smoke inlet end of the second evaporation flue 134; when the smoke quantity extracted by the first evaporation flue 133 is difficult to meet the system operation requirement, the second electric baffle door 27 is started, and part of high-temperature smoke is extracted to ensure the stable operation of the subsequent evaporation dechlorination dust removal device; the two-fluid atomization spray gun 131 mainly comprises an inner layer pipeline, an outer layer pipeline and an inner mixing cavity. The working medium flowing in the central pipeline can be compressed air moving at a high speed, the pressure is 0.5Mpa, and the medium flowing in the outer pipeline is waste water concentrated solution with the flow speed of 1.5-2.0 m/s. Compressed gas is coated by concentrated wastewater after being sprayed out from the central tube at a high speed and moves forward continuously, interaction occurs between the gas and the liquid to realize atomization of the liquid, and the liquid is atomized twice through a mixing part and a nozzle to meet the requirement of finer atomized particle size.
As shown in FIG. 2, the spraying angle of the two-fluid spray gun 131 relative to the first evaporation flue 133 is 60 degrees, the spraying speed is 50m/s, and through early-stage model selection and later-stage debugging, atomized particles reach the optimal evaporation particle size of 50 μm, and the two-fluid spray gun has the advantages of relatively fast evaporation time and relatively short evaporation distance. The atomized wastewater of the two-fluid spray gun 131 contacts with the flue gas at 120-150 ℃, the atomized wastewater is quickly evaporated to dryness to form particles containing chlorine salt and the like, the particles containing chlorine salt and the like enter the bag type dust collector 132 along with the flue gas, the particles containing chlorine salt are collected by the high-efficiency bag type dust collector 132, and the flue gas after dedusting, dechlorination and purification enters the concentration and decrement device 12. The amount of the waste water is related to the content of chloride ions in the concentration and decrement device 12, and after dechlorination and dust removal are carried out on the waste water after concentration and evaporation, the chloride ions in 95-99% of the waste water can be reduced to enter a desulfurization system, so that the waste water production amount is reduced.
The concentration and decrement device 12 consists of an evaporation concentration tower 121, a variable frequency spray layer 122, a removable liquid drop catcher 123 and a wastewater concentration tank 124, wherein the shell of the evaporation concentration tower 121 is made of stainless steel (2205 or 2507) or glass fiber reinforced plastic, the wastewater concentration tank 124 is arranged at the bottom of the evaporation concentration tower 121, the variable frequency spray layer 122 and the removable liquid drop catcher 123 are arranged in the evaporation concentration tower 121, and the removable liquid drop catcher 123 is positioned above the variable frequency spray layer 122; the evaporation concentration tower 121 is provided with a third smoke inlet 125 at the lower part and a second smoke outlet 126 at the top, the first smoke outlet 135 is communicated with the third smoke inlet 125 through a smoke inlet channel 127, and the second smoke outlet 126 is communicated with the front end flue 42 of the desulfurization tower through a smoke outlet channel 128; the waste water concentration tank 124 is connected with the variable frequency spraying layer 122 through the variable frequency pump 25, the variable frequency spraying layer is composed of a circulating pipe, a spraying pipe and a nozzle, and the variable frequency pump 25 can regulate and control the amount of circulating slurry through variable frequency according to the requirements of the temperature and concentration multiple of boiler flue gas in front of the desulfurizing tower 7. The wastewater concentration tank 124 is connected to the two-fluid spray gun 131 through the discharge pump 23, and the wastewater concentration tank 124 is connected to the wastewater pretreatment apparatus 11 through the transfer pump 22. The wastewater pretreatment device 11 removes suspended matters in the desulfurization wastewater, adjusts the pH of the wastewater, and then enters the concentration and decrement device 12. The first flue gas parameter monitoring device 32 is arranged on a flue at the rear end of the induced draft fan 6; the second flue gas parameter monitoring device 33 is arranged on the front end flue 41 of the dry-type electric dust remover; the third flue gas parameter monitoring device 34 is installed on the flue inlet 127 of the evaporation concentration tower 121, the fourth flue gas parameter monitoring device 35 is installed on the flue outlet 128 of the evaporation concentration tower 121, the wastewater solid content monitoring device 31 is arranged in the wastewater concentration pool 124, the third electric damper 28 is installed at the flue outlet end of the flue outlet 128, when the wastewater solid content reaches a certain value, the discharge pump 23 is started, the concentrated wastewater is atomized and sprayed out through the two-fluid spray gun 131, and the electric regulating valve 24 is installed on a pipeline between the discharge pump 23 and the two-fluid spray gun 131. The desulfurization wastewater is atomized into fog drops with the particle size of 200-300 microns by a hollow cone nozzle of the variable-frequency spraying layer 122 and then reversely contacts with the boiler flue gas, and the wastewater is quickly evaporated; the flue gas continues to travel upward into the extractable droplet catcher 123 to remove the wastewater droplets carried in the flue gas.
According to the boiler load and the wastewater treatment capacity, the control device 21 is used for controlling the fresh wastewater delivery pump 22, the concentrated wastewater discharge pump 23, the compressed air electric regulating valve 24, the wastewater circulating variable frequency pump 25, the first electric baffle door 26 and the second electric baffle door 27, so that the efficient, stable and safe operation of the whole system is realized.
By the embodiment, chloride ions discharged along with flue gas during evaporation of the wastewater can be reduced and re-enter the wastewater concentration system and the desulfurization system, so that source emission reduction of the wastewater is realized; meanwhile, the concentrated waste water evaporation byproducts are high-chlorine-salt-content and heavy metal-content substances which are collected by an independently-operated high-efficiency bag type dust collector, so that the ash quality of the original dust collector is prevented from being reduced. Adjusting the flow of flue gas extracted for concentrating and evaporating the wastewater in real time according to the wastewater treatment capacity; and meanwhile, the concentrated wastewater injection amount of the double-fluid spray gun is adjusted according to the load of the boiler, so that the high-efficiency stable safe operation of the whole system is realized.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is merely an embodiment of the present invention, and the actual structure is not limited thereto. Therefore, those skilled in the art should understand that they can easily and effectively implement the present invention without departing from the spirit and scope of the present invention.
Claims (7)
1. The utility model provides an intelligent waste water zero release coupling dechlorination system of flue gas waste heat utilization, uses with the cooperation of flue gas dust removal desulfurization system, flue gas dust removal desulfurization system include by flue gas duct connected gradually dry-type electrostatic precipitator, draught fan and desulfurizing tower, its characterized in that, it includes the waste water dechlorination device that is arranged in realizing the waste water dechlorination through boiler flue gas waste heat, is arranged in controlling mechanism and the sensing mechanism that is arranged in monitoring waste water dechlorination device flue gas and waste water information, controlling mechanism and sensing mechanism be connected with waste water dechlorination device respectively, controlling mechanism is connected with sensing mechanism; the wastewater dechlorination device comprises a wastewater pretreatment device used for removing suspended matters from the desulfurization wastewater and adjusting the pH value, a concentration and decrement device used for concentrating the desulfurization wastewater, and an evaporation dechlorination and dust removal device used for evaporating the concentrated wastewater and removing solid products.
2. The intelligent zero-discharge coupling dechlorination system for waste heat utilization of flue gas as claimed in claim 1, wherein the flue gas flue comprises a front-end flue of a dry electric dust remover and a front-end flue of a desulfurizing tower, a smoke inlet of the dry electric dust remover is communicated with the front-end flue of the dry electric dust remover, and a smoke outlet of the dry electric dust remover is communicated with the front-end flue of the desulfurizing tower through an induced draft fan; the waste water pretreatment device be connected with desulfurizing tower and concentrated decrement device respectively, evaporation dechlorination dust collector's smoke inlet and dry-type electrostatic precipitator front end flue and desulfurizing tower front end flue intercommunication, evaporation dechlorination dust collector's outlet and concentrated decrement device's smoke inlet intercommunication, evaporation dechlorination dust collector's smoke inlet department is equipped with concentrated waste water import.
3. The intelligent zero-discharge coupling dechlorination system for flue gas waste heat utilization according to claim 1 or 2, wherein the control mechanism comprises a control device, a delivery pump for delivering fresh wastewater, a discharge pump for discharging concentrated wastewater, an electric control valve for compressing air, a variable frequency pump for circulating wastewater, a first electric baffle door for opening and closing boiler flue gas extraction, a second electric baffle door and a third electric baffle door for opening and closing flue gas discharge, and the delivery pump, the discharge pump, the electric control valve, the variable frequency pump, the first electric baffle door, the second electric baffle door and the third electric baffle door are connected with the control device.
4. The intelligent zero-emission wastewater coupling dechlorination system for flue gas waste heat utilization according to claim 3, wherein the sensing mechanism comprises a solid content monitoring device for monitoring wastewater in the concentration and reduction device, a first flue gas parameter monitoring device for monitoring flue gas at an inlet of the desulfurizing tower, a second flue gas parameter monitoring device for monitoring flue gas at an inlet of the dry electric dust remover, a third flue gas parameter monitoring device and a fourth flue gas parameter monitoring device for monitoring flue gas inlet and outlet of the concentration and reduction device, and the solid content monitoring device for wastewater, the first flue gas parameter monitoring device, the second flue gas parameter monitoring device, the third flue gas parameter monitoring device and the fourth flue gas parameter monitoring device are respectively connected with the control device.
5. The intelligent zero-discharge wastewater coupling dechlorination system for flue gas waste heat utilization according to claim 3, wherein the evaporation dechlorination dust removal device comprises a two-fluid spray gun, a bag type dust collector, a first evaporation flue and a second evaporation flue; one end of the bag type dust collector is provided with a first smoke inlet and a second smoke inlet, the other end of the bag type dust collector is provided with a first smoke outlet, the first smoke inlet is communicated with a flue at the rear end of the induced draft fan through a first evaporation flue, and the second smoke inlet is communicated with a flue at the front end of the dry type electric dust collector through a second evaporation flue; the double-fluid spray gun is arranged in the first evaporation flue and is connected with the wastewater inlet, and the first electric baffle door is arranged at the smoke inlet end of the first evaporation flue; and the second electric baffle door is arranged at the smoke inlet end of the second evaporation flue.
6. The intelligent zero-discharge coupling dechlorination system for waste heat utilization of flue gas of claim 4, wherein the concentration and reduction device comprises an evaporation concentration tower, a variable-frequency spraying layer, a removable liquid drop catcher and a waste water concentration tank, the waste water concentration tank is arranged at the bottom of the evaporation concentration tower, the variable-frequency spraying layer and the removable liquid drop catcher are arranged in the evaporation concentration tower, and the removable liquid drop catcher is positioned above the variable-frequency spraying layer; the lower part of the evaporation concentration tower is provided with a third smoke inlet, the top of the evaporation concentration tower is provided with a second smoke outlet, the third smoke inlet is communicated with the first smoke outlet through a smoke inlet flue, and the second smoke outlet is communicated with a front end flue of the desulfurizing tower through a smoke outlet flue; the wastewater concentration tank is connected with the variable-frequency spraying layer through a variable-frequency pump, the wastewater concentration tank is connected with the wastewater inlet through a discharge pump, and the wastewater concentration tank is connected with the wastewater pretreatment device through a delivery pump; the first flue gas parameter monitoring device is arranged on a flue at the rear end of the induced draft fan; the second flue gas parameter monitoring device is arranged on a front-end flue of the dry electric dust remover; the third flue gas parameter monitoring device is installed on the flue inlet of the evaporation concentration tower, the fourth flue gas parameter monitoring device is installed on the flue outlet of the evaporation concentration tower, the waste water solid content monitoring device is arranged in the waste water concentration tank, the electric regulating valve is installed on a pipeline between the discharge pump and the double-fluid spray gun, and the third electric baffle door is installed at the flue outlet end of the flue outlet.
7. The intelligent waste water zero-discharge coupling dechlorination system for flue gas waste heat utilization according to claim 5, wherein the injection angle of the two-fluid spray gun relative to the first evaporation flue is 30-60 degrees.
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| CN201922481600.5U CN211946337U (en) | 2019-12-31 | 2019-12-31 | Intelligent waste water zero discharge coupling dechlorination system utilizing waste heat of flue gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113620363A (en) * | 2021-10-13 | 2021-11-09 | 大唐环境产业集团股份有限公司 | Intelligent-adjustment wastewater zero-discharge system and method |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113620363A (en) * | 2021-10-13 | 2021-11-09 | 大唐环境产业集团股份有限公司 | Intelligent-adjustment wastewater zero-discharge system and method |
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