CN111908536B - Desulfurization wastewater concentrated solution pulsation spray drying method and drying device - Google Patents
Desulfurization wastewater concentrated solution pulsation spray drying method and drying device Download PDFInfo
- Publication number
- CN111908536B CN111908536B CN202010925896.XA CN202010925896A CN111908536B CN 111908536 B CN111908536 B CN 111908536B CN 202010925896 A CN202010925896 A CN 202010925896A CN 111908536 B CN111908536 B CN 111908536B
- Authority
- CN
- China
- Prior art keywords
- hot air
- concentrated solution
- waste water
- drying
- pulsation
- 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.)
- Active
Links
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 116
- 230000023556 desulfurization Effects 0.000 title claims abstract description 116
- 239000002351 wastewater Substances 0.000 title claims abstract description 115
- 238000001035 drying Methods 0.000 title claims abstract description 112
- 230000010349 pulsation Effects 0.000 title claims abstract description 54
- 238000001694 spray drying Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000005507 spraying Methods 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 239000008247 solid mixture Substances 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 6
- 238000000926 separation method Methods 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 39
- 239000012141 concentrate Substances 0.000 claims description 33
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 23
- 239000003546 flue gas Substances 0.000 claims description 23
- 239000000428 dust Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 20
- 238000005299 abrasion Methods 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 2
- 239000012071 phase Substances 0.000 description 20
- 238000000889 atomisation Methods 0.000 description 15
- 238000012546 transfer Methods 0.000 description 11
- 239000007791 liquid phase Substances 0.000 description 10
- 150000003839 salts Chemical class 0.000 description 9
- 239000000126 substance Substances 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 239000000047 product Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000009690 centrifugal atomisation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- C02F1/048—Purification of waste water by evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/18—Evaporating by spraying to obtain dry solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/20—Sprayers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
-
- 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
- C02F1/043—Details
-
- 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
- C02F2301/06—Pressure conditions
- C02F2301/066—Overpressure, high pressure
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention provides a desulfurization waste water concentrated solution pulsation spray drying method and a drying device, wherein the method dries and solidifies the desulfurization waste water concentrated solution by hot air, and the method comprises the following steps: 1) Pressurizing the desulfurization wastewater concentrated solution to 2-7MPa; pressurizing hot air to 10-30KPa, and then modulating into 60-120 Hz pulsating hot air flow; 2) Pressurizing the desulfurization waste water concentrated solution and the pressurized pulsating hot air flow according to the following steps (1-2): 1, atomizing by a spraying device after mixing the liquid and gas mass ratios, modulating into vortex fluid by an airflow modulating device after atomizing, and entering a drying chamber for drying treatment; the gas-solid mixture discharged from the drying chamber is sent to a cyclone separator for gas-solid separation. The invention carries out spray drying treatment by mixing the desulfurization wastewater concentrated solution with the pulsating hot air, so that the atomizer is not easy to be blocked, the abrasion is reduced, the maintenance and use cost of equipment is reduced, the energy consumption can be reduced, and the volume and the cost of the drying equipment can be reduced.
Description
Technical field:
the invention relates to a drying method and a drying device, in particular to a desulfurization wastewater concentrated solution pulsating spray drying method and a desulfurization wastewater concentrated solution pulsating spray drying device, and belongs to the technical field of chemistry and chemical engineering.
The background technology is as follows:
the thermal power generation can generate desulfurization waste water, the salt content of concentrated solution is generally 10-25% (depending on the concentration decrement process adopted) after the desulfurization waste water is purified and concentrated by a front-end process section, solidification is the last link of the desulfurization waste water treatment process, spray drying is carried out, the powder particles dried by the spray drying have good fluidity, the surface characteristics of the particles are excellent, the particle size distribution is reasonable, the spray drying is widely applied to the desulfurization waste water solidification treatment, and after the desulfurization waste water concentrated solution is solidified, the solid powder salt with the water content of about 3-8% is formed for recycling or is treated as solid waste.
The solidification process of the desulfurization waste water concentrated solution is various, a high-speed centrifugal spray drying process and a pressure spray drying process are commonly adopted, the desulfurization waste water concentrated solution is sprayed into a drying solidification chamber through a high-speed centrifugal atomizer or a pressure atomizer, and is sprayed into ultrafine atomized liquid beads, and the direct heat and mass transfer is carried out on hot flue gas in front of a secondary hot air or an air preheater of a coal-fired power plant which is modulated into a cyclone flow state, so that the desulfurization waste water concentrated solution is dried into solid powder in a very short time. The dry and solidified salt is deposited to the bottom of the tower body for collection, or is directly sent to the inlet of a dust remover of the coal-fired power plant along with hot air or hot flue gas at the temperature of about 80-100 ℃ for mixing into flue gas treatment of the coal-fired power plant; or discharged from the bottom after cyclone separation, and recycled (only purified hot air can be used for solidification and drying during recycling), and the hot air is sent to a dust collector inlet of the coal-fired power plant and mixed with flue gas treatment of the coal-fired power plant.
However, the desulfurization wastewater concentrate has the characteristics of complex components, extremely high content of chloride ions, sulfate radicals and the like, strong corrosiveness, high abrasion, high viscosity and extremely serious scaling tendency, and a high-speed centrifugal atomizer or a pressure atomizer is required to be used in the spraying process, so that the atomizer is required to be shut down, repaired and replaced due to blockage, abrasion and other reasons, and the maintenance cost is higher. The traditional high-speed centrifugal atomization dryer and pressure atomization dryer have the advantages of low heat and mass transfer efficiency, high heat consumption, low volume evaporation intensity and large hot air consumption or hot smoke consumption of a drying system.
The invention comprises the following steps:
the invention provides a pulsating spray drying method of desulfurization wastewater concentrate, aiming at the characteristics of desulfurization wastewater concentrate and the defects of a traditional high-speed centrifugal atomization dryer and a traditional pressure atomization dryer.
The invention further aims to provide a desulfurization wastewater concentrated solution pulsating spray drying device.
The specific technical scheme of the invention is as follows:
a method for drying desulfurization waste water concentrated solution by pulsation spray comprises the following steps of:
1) Pressurizing the desulfurization wastewater concentrated solution to 2-7MPa; pressurizing hot air to 10-30KPa, and then modulating into 60-120 Hz pulsating hot air flow;
2) Pressurizing the desulfurization waste water concentrated solution and the pressurized pulsating hot air flow according to the following steps (1-2): 1, atomizing by a spraying device after mixing the liquid and gas mass ratios, modulating into vortex fluid by an airflow modulating device after atomizing, and entering a drying chamber for drying treatment; the gas-solid mixture discharged from the drying chamber is sent to a cyclone separator for gas-solid separation; the gas discharged by the cyclone separator is sent to the inlet of the dust remover of the coal-fired power plant by an induced draft fan and is further trapped and treated by the dust remover of the coal-fired power plant.
Further, a second path of desulfurization wastewater concentrated solution and a second path of hot air are also arranged and are conveyed into a drying chamber for drying treatment; the mass ratio of the second desulfurization wastewater concentrated solution to the second hot air liquid-air is (0.13-0.16): 1.
further, the hot air is secondary hot air of a coal-fired power plant or hot flue gas before an air preheater.
Further, the hot flue gas before the secondary hot air or the air preheater is subjected to supercharging treatment after being purified by a gas filter.
Further, the hot air is pressurized to 30KPa; the pulsation modulator modulates into a pulsation airflow of 83Hz, 100.51Hz or 117 Hz; the desulfurization wastewater concentrate is pressurized to 2MPa.
A desulfurization wastewater concentrated solution pulsation spray drying device comprises a blower, a supercharging device, a spraying device, an airflow modulating device, a feed pump, a drying chamber, a cyclone separator, an induced draft fan and a pulsation device; the pulsation device, the spraying device and the airflow modulation device are arranged at the top of the drying chamber; the blower is sequentially connected with the supercharging device and the pulsation device through pipelines; the material supply pump is connected to the outlet of the pulsation device in the drying chamber through a pipeline; mixing the hot air and the desulfurization wastewater concentrated solution at the outlet of the pulsation device, and then spraying the mixture into a drying chamber through a spraying device and an airflow modulation device in sequence; the outlet of the drying chamber is sequentially connected with a cyclone separator and an induced draft fan.
Further, the feed pump and the blower are also provided with pipelines which are directly connected into the drying chamber.
Further, a purification device is arranged in front of the supercharging device.
Further, the pulsation device is a pulsation valve.
Further, the supercharging device is a supercharging fan, the spraying device is a centrifugal pressure type nozzle, and the purifying device is a gas filter.
Compared with the prior art, the invention has the following technical effects:
1. according to the desulfurization waste water concentrated solution pulsating spray drying method, the pulsating hot air is used for carrying out atomization drying treatment on the desulfurization waste water concentrated solution to form a gas-liquid mixed phase, and a plurality of tiny bubbles exist in atomized mixed liquid drops, so that the mass and heat transfer surface area in the drying process is greatly increased, the mass and heat transfer efficiency is improved, and the drying time is shortened.
2. According to the desulfurization wastewater concentrated solution pulsation spray drying method, a pulsation modulation process is added, so that an atomizer used in an atomization process is not easy to block, and abrasion can be reduced.
3. The method for pulse spray drying of the desulfurization waste water concentrated solution can also be provided with a second path of desulfurization waste water concentrated solution and a second path of hot air, and the second path of desulfurization waste water concentrated solution and the second path of hot air are directly conveyed into a drying chamber for drying, so that the consumption of secondary hot air of a coal-fired power plant or the consumption of hot flue gas before an air preheater required by drying is reduced, thereby reducing the energy consumption of a fan and the energy consumption of a heat source, and compared with the traditional pressure spray drying, the energy consumption of pulse atomization treatment can be reduced by 36-45%.
4. According to the desulfurization waste water concentrated solution pulsating spray drying device, the pulsating device is arranged, hot air is modulated into pulsating air flow, the pulsating air flow is mixed with the desulfurization waste water concentrated solution and then atomized and enters the drying chamber for drying, a gas-liquid mixed phase is formed, a plurality of tiny bubbles exist in atomized mixed liquid drops, the mass and heat transfer surface area in the drying process is greatly increased, the mass and heat transfer efficiency is improved, the drying time is shortened, and therefore the energy consumption of the air blower and the energy consumption of a heat source are reduced.
5. Compared with the traditional pressure spray drying, the volume evaporation intensity of the desulfurization wastewater concentrated solution pulsation spray drying device is greatly improved, so that the volume and the manufacturing cost of drying equipment are reduced.
Description of the drawings:
FIG. 1 is a schematic diagram of a third embodiment of the present invention;
FIG. 2 is a schematic diagram of a fourth embodiment of the present invention;
in the figure: 1. a blower; 2. a supercharging device; 3. a pulsating device; 4. a spraying device; 5. an air flow modulating device; 6. a feed pump; 7. a drying chamber; 8. a cyclone separator; 9. an induced draft fan; 10. a purifying device.
The specific embodiment is as follows:
embodiment one:
the desulfurization waste water concentrated solution pulsation spray drying method of the embodiment dries and solidifies the desulfurization waste water concentrated solution by hot air, and comprises the following two steps:
1) Pressurizing the desulfurization wastewater concentrated solution to 2-7MPa; and pressurizing the hot air to 10-30KPa, and then modulating into 60Hz-120Hz pulsating hot air flow. Because the embodiment is used in a coal-fired power plant, the hot air is preferably secondary hot air of the coal-fired power plant or pre-air preheater hot flue gas.
2) Pressurizing the desulfurization waste water concentrated solution and the pressurized pulsating hot air flow according to the following steps (1-2): and 1, after mixing the liquid and the gas in the mass ratio, atomizing by a spraying device, modulating into vortex fluid by an airflow modulating device after atomizing, and entering a drying chamber for drying treatment. In the drying chamber, the desulfurization waste water concentrated solution and the hot air form a strong turbulence flow state, and liquid phase droplets fluctuate along with the gas phase and rapidly diffuse. In the strong turbulent flow state, the two items are subjected to mass, momentum and energy exchange, the liquid phase is dried, and the gas phase is humidified. The gas-solid mixture discharged from the drying chamber is sent to a cyclone separator for gas-solid separation, and the gas discharged from the cyclone separator is sent to an inlet of a dust remover of a coal-fired power plant by an induced draft fan and is further trapped and treated by the dust remover of the coal-fired power plant; the separated solid product is the dried product of the desulfurization wastewater concentrated solution, and is subjected to subsequent treatment.
According to the pulsating spray drying method for the desulfurization wastewater concentrated solution, the pulsating hot air is used for carrying out atomization drying treatment on the desulfurization wastewater concentrated solution to form a gas-liquid mixed phase, and a plurality of tiny bubbles exist in atomized mixed liquid drops, so that the mass and heat transfer surface area in the drying process is greatly increased, the mass and heat transfer efficiency is improved, and the drying time is shortened. Meanwhile, as the pulsation modulation process is added, the atomizer used in the atomization process is not easy to block, and the abrasion can be reduced.
Embodiment two:
in the method for pulsating spray drying of desulfurization waste water concentrate of the present embodiment, on the basis of the first embodiment, a second path of desulfurization waste water concentrate and a second path of hot air are further provided, and the second path of desulfurization waste water concentrate and the second path of hot air are directly conveyed into a drying chamber for drying treatment. The mass ratio of the second desulfurization wastewater concentrated solution to the second hot air liquid-air is (0.13-0.16): 1. the hot air is secondary hot air of a coal-fired power plant or hot flue gas before an air preheater, and the secondary hot air or the hot flue gas before the air preheater is subjected to supercharging treatment after particulate matters which can block a subsequent atomization process are removed through a gas filter.
Through experiments and actual demands of coal-fired power plants, the embodiment is preferable, in the step 1), hot air is pressurized to 30KPa, and desulfurization wastewater concentrate is pressurized to 2MPa; the pulsing modulator in step 2) modulates into a pulsing gas flow of 83Hz, 100.51Hz or 117 Hz.
The embodiment reduces the consumption of secondary hot air of a coal-fired power plant or hot flue gas before an air preheater required for drying, thereby reducing the energy consumption of a fan and the energy consumption of a heat source, and compared with the traditional pressure spray drying, the energy consumption of the pulsating atomization treatment can be reduced by 36-45%.
Embodiment III:
in this example, a desulfurization wastewater concentrate pulsating spray drying device with a treatment capacity of 1 m/h and a salt content of 10% (mass percent) is taken as an example:
as shown in fig. 1, the desulfurization wastewater concentrate pulsating spray drying device comprises a blower 1, a supercharging device 2, a pulsation device 3, a spraying device 4, an airflow modulating device 5, a feed pump 6, a drying chamber 7, a cyclone separator 8 and an induced draft fan 9, wherein the airflow modulating device is a vortex airflow modulating device, the supercharging device 2 is a supercharging fan, the pulsation device 3 is a pulsation valve, and the spraying device 4 is a centrifugal pressure nozzle.
The blower 1 is selected as follows: the rotating speed is 1450 rpm, the frequency conversion is adjustable, and the rated air quantity is 8500kg/h under the conditions of 300 ℃ and 2 KPa. The centrifugal pressure type nozzle is selected from the following types: the atomizing aperture is 4.5mm, the angle is 67 degrees, the working pressure is 2MPa, and the rated flow is 18.4L/min. The diameter of the air inlet of the vortex air flow modulation device is 500mm, the air inlet of the vortex air flow modulation device is connected with the drying air flow air supply pipeline, and the diameter of the air outlet of the vortex air flow modulation device is 120mm.
The blower 1 is sequentially connected with the supercharging device 2 and the pulsation device 3, the material feeding pump 6 is connected to the outlet of the pulsation device 3 to mix hot air with the desulfurization wastewater concentrate, and the air flow modulation device 5 is arranged at the outlet of the pulsation device 4. The pulsation device, the spraying device and the airflow modulation device are arranged at the top of the drying chamber. The hot air is sequentially sent to a pressurizing device 2 and a pulsation device 3 through a blower 1 to obtain pressurized pulsation airflow. Meanwhile, after being pressurized by the feed pump 6, the desulfurization wastewater concentrated solution is sent into the spraying device 4 together with the pressurized pulsating air flow for mixed atomization, and then is modulated into vortex-shaped air flow by the air flow modulation device 5 and then is sprayed into the drying chamber 7, and the drying treatment is carried out in the drying chamber 7. The outlet of the drying chamber 7 is connected with a cyclone separator 8 and an induced draft fan 9 for processing the dried product.
The hot air in the embodiment is hot flue gas before the air preheater of the coal-fired power plant, the hot flue gas before the air preheater (the temperature is about 300 ℃) is sent into the pressurizing device 2 through a hot air pipeline to be pressurized to 30KPa, and then the hot air is modulated into 83Hz pulsating air flow through the pulsation device 3. The desulfurization waste water concentrated solution is pressurized to 2MPa by an incoming pump 6, and then the desulfurization waste water concentrated solution and the hot air after pressurizing pulsation are mixed according to the mass ratio of liquid to gas of 1.19:1 are sent into a centrifugal pressure nozzle for atomization, hot flue gas and desulfurization wastewater concentrated solution before the air preheater are modulated into vortex fluid by a vortex air flow modulation device 5, and enter a drying chamber 7 for drying treatment.
In the drying chamber 7, the two flows (desulfurization waste water concentrate and hot air) form a strongly turbulent flow state, and liquid-phase droplets fluctuate with the gas phase and rapidly spread. In the strong turbulent flow state, the two items are subjected to mass, momentum and energy exchange, the liquid phase is dried, and the gas phase is humidified.
The gas-solid mixture discharged from the discharging air pipe of the drying chamber 7 is separated by the cyclone separator 8, the dried and solidified substance is directly sent to the inlet of the dust remover of the coal-fired power plant by the induced draft fan 9, and the dried and solidified substance is trapped by the dust remover of the coal-fired power plant and mixed with fly ash of the coal-fired power plant. The hot air for drying is mixed into the flue gas of the coal-fired power plant and is discharged after being purified along with the flue gas of the coal-fired power plant.
Embodiment four:
as shown in fig. 2, in this embodiment, in order to reduce energy consumption, a second hot air channel and a second desulfurization waste water concentrated solution channel are further provided, a feed pump 6 and a blower 1 are respectively provided with a pipeline leading to a drying chamber 7, and the pressurized second desulfurization waste water concentrated solution channel is formed by mixing the second desulfurization waste water concentrated solution channel with the second hot air channel according to a mass ratio of 0.133:1, and the second path of desulfurization waste water concentrated solution and the second path of hot air are used for drying the desulfurization waste water concentrated solution by means of the pulsating desulfurization waste water concentrated solution and the hot air, so that the energy consumption of the whole device can be reduced.
In this embodiment, for the desulfurization waste water concentrate having a salt content of 10%, the mass ratio of the desulfurization waste water concentrate to the dry gas stream is preferably 0.133:1.
fifth embodiment:
in this example, a desulfurization wastewater concentrate pulsating spray drying device with a treatment capacity of 2 m/h and a salt content of 20% (mass percent) is taken as an example:
referring to fig. 2, the desulfurization wastewater concentrate pulsating spray drying device comprises a blower 1, a purifying device 10, a supercharging device 2, a pulsating device 3, a spraying device 4, an airflow modulating device 5, a feed pump 6, a drying chamber 7, a cyclone separator 8 and an induced draft fan 9, wherein the airflow modulating device 5 is a vortex airflow modulating device, the supercharging device 2 is a supercharging fan, the pulsating device 3 is a pulsating valve, the spraying device 4 is a centrifugal pressure type nozzle, the purifying device 10 is a gas filter, and the cyclone separator 8 is a secondary cyclone separator.
The blower 1 is selected as follows: the rotating speed is 1450 rpm, the frequency conversion is adjustable, and the rated air quantity is 17450kg/h under the conditions of 260 ℃ and 2 KPa. The centrifugal pressure type nozzle is selected from the following types: the atomizing aperture is 4.5mm, the angle is 67 degrees, the working pressure is 2MPa, and the rated flow is 18.4L/min. The diameter of an air inlet of the vortex type air flow modulation device is 650mm, the vortex type air flow modulation device is connected with a secondary hot air supply pipeline, the diameter of an air outlet of the vortex type air flow modulation device is 180mm, two air flow modulation devices 5 are arranged, and the two air flow modulation devices are symmetrically arranged at the top of a drying chamber 7 at 180 degrees.
The air blower 1 is sequentially connected with the purifying device 10, the supercharging device 2 and the pulsation device 3, the material feeding pump 6 is connected to the outlet of the pulsation device 3 to mix hot air with the desulfurization wastewater concentrate, and the air flow modulation device 5 is arranged at the outlet of the pulsation device 3. The pulsating device 3, the spraying device 4 and the air flow modulation device 5 are arranged at the top of the drying chamber 7. The hot air is sequentially sent to a purification device 10, a supercharging device 2 and a pulsation device 3 through a blower 1, so that the supercharged pulsation airflow which is purified through a gas filter and removes particles possibly blocking an atomizer is obtained. Meanwhile, after being pressurized by the feed pump 6, the desulfurization wastewater concentrated solution is sent into the spraying device 4 together with the pressurized pulsating air flow for mixed atomization, and then is modulated into vortex-shaped air flow by the air flow modulation device 5 and then is sprayed into the drying chamber 7, and the drying treatment is carried out in the drying chamber 7. The outlet of the drying chamber 7 is connected with a cyclone separator 8 and an induced draft fan 9 for processing the dried product.
The hot air in this example is the secondary hot air (temperature about 260 ℃) of the coal-fired power plant, the secondary hot air is conveyed to the gas filter through the hot air pipeline, then is conveyed into the supercharging device 2 to be supercharged to 30KPa, and then is modulated into a pulsating air flow of 100 Hz through the pulsation valve. The desulfurization waste water concentrated solution is pressurized to 2MPa by an incoming pump 6, and then the desulfurization waste water concentrated solution and the hot air after pressurizing pulsation are mixed according to the mass ratio of liquid to gas of 1.34:1 is fed into a centrifugal pressure nozzle for atomization. The mixed fluid is regulated to be in cyclone state by two air flow regulating devices, and enters a drying chamber 7 for drying treatment.
In order to reduce energy consumption, the embodiment is further provided with a second path of hot air and a second path of desulfurization waste water concentrated solution, the feed pump 6 and the blower 1 are respectively provided with a pipeline to the drying chamber 7, and the pressurized second path of desulfurization waste water concentrated solution is fed into the drying chamber 7 according to the mass ratio of the second path of desulfurization waste water concentrated solution to the second path of hot air of 0.15:1, and the second path of desulfurization waste water concentrated solution and the second path of hot air are used for drying the desulfurization waste water concentrated solution by means of the pulsating desulfurization waste water concentrated solution and the hot air, so that the energy consumption of the whole device can be reduced.
In the drying chamber 7, four streams (two desulfurization waste water concentrates and two hot air streams) form a strongly turbulent flow state, and liquid-phase droplets fluctuate with the gas phase and rapidly spread. In the strong turbulent flow state, the two items are subjected to mass, momentum and energy exchange, the liquid phase is dried, and the gas phase is humidified.
The gas-solid mixture discharged from the discharging air pipe of the drying chamber 7 is sent to the secondary cyclone separator, the dried and solidified substance is captured by the cyclone separator, and the gas-solid mixture is discharged from the discharging hole of the cyclone separator, so that the resource utilization of the dried and solidified substance can be realized. Hot air discharged by the cyclone separator is sent to an inlet of a dust remover of the coal-fired power plant through a draught fan 9, and fine dry solidified matters which are not trapped by the cyclone separator are trapped by the dust remover of the coal-fired power plant and mixed with fly ash of the coal-fired power plant. The hot air for drying is mixed into the flue gas of the coal-fired power plant and is discharged after being purified along with the flue gas of the coal-fired power plant.
In this embodiment, for the desulfurization waste water concentrate having a salt content of 20%, the mass ratio of the desulfurization waste water concentrate to the dry gas stream is preferably 0.15:1.
example six:
in this example, a desulfurization wastewater concentrate apparatus having a treatment capacity of 3.2 m/h and a salt content of 25% (mass percent) was used as an example:
referring to fig. 2, the desulfurization wastewater concentrate pulsating spray drying device comprises a blower 1, a purifying device 10, a supercharging device 2, a pulsating device 3, a spraying device 4, an airflow modulating device 5, a feed pump 6, a drying chamber 7, a cyclone separator 8 and an induced draft fan 9, wherein the airflow modulating device 5 is a vortex airflow modulating device 5, the supercharging device 2 is a supercharging fan, the pulsating device 3 is a pulsating valve, the spraying device 4 is a centrifugal pressure nozzle, the purifying device 10 is a gas filter, and the cyclone separator 8 is a secondary cyclone separator.
The blower 1 is selected as follows: the rotating speed is 1450 rpm, the frequency conversion is adjustable, and the rated air quantity is 23500kg/h under the conditions of 300 ℃ and 2 KPa. The centrifugal pressure type nozzle is selected from the following types: the atomizing aperture is 4mm, the angle is 65 degrees, the working pressure is 2MPa, and the rated flow is 13.9L/min. The diameter of the air inlet of the vortex type air flow modulation device 5 is 1000mm, the air inlet is connected with a hot air supply pipeline, the diameter of the air outlet of the vortex type air flow modulation device is 210mm, and the four air flow modulation devices are symmetrically arranged at the top of the drying tower at 90 degrees.
The air blower 1 is sequentially connected with the purifying device 10, the supercharging device 2 and the pulsation device 3, the material feeding pump 6 is connected to the outlet of the pulsation device 3 to mix hot air with the desulfurization wastewater concentrate, and the air flow modulation device 5 is arranged at the outlet of the pulsation device 3. The pulsating device 3, the spraying device 4 and the air flow modulation device 5 are arranged at the top of the drying chamber 7. The hot air is sequentially sent to a pressurizing device 2 and a pulsation device 3 through a blower 1, so that pressurized pulsation airflow which is purified through a gas filter and removes particulate matters which can block an atomizer is obtained. Meanwhile, after being pressurized by the feed pump 6, the desulfurization wastewater concentrated solution is sent into the spraying device 4 together with the pressurized pulsating air flow for mixed atomization, and then is modulated into vortex-shaped air flow by the air flow modulation device 5 and then is sprayed into the drying chamber 7, and the drying treatment is carried out in the drying chamber 7. The outlet of the drying chamber 7 is connected with a cyclone separator 8 and an induced draft fan 9 for processing the dried product.
The hot air in this example is the secondary hot air (temperature about 300 ℃) of the coal-fired power plant, the secondary hot air is conveyed to the gas filter through the hot air pipeline, then is conveyed into the pressurizing device 2 to be pressurized to 30KPa, and then is modulated into the pulsating air flow of 117Hz through the pulsating valve. The desulfurization waste water concentrated solution is pressurized to 2MPa by an incoming pump 6, and then the desulfurization waste water concentrated solution and the hot air after pressurizing pulsation are mixed according to the mass ratio of liquid to gas of 1.43:1 is fed into a centrifugal pressure nozzle for atomization. The mixed fluid is regulated to be in cyclone state by four air flow regulating devices, and enters a drying chamber 7 for drying treatment.
In order to reduce energy consumption, the embodiment is further provided with a second path of hot air and a second path of desulfurization waste water concentrated solution, the feed pump 6 and the blower 1 are respectively provided with a pipeline to the drying chamber 7, and the pressurized second path of desulfurization waste water concentrated solution is fed into the drying chamber 7 according to the mass ratio of the second path of desulfurization waste water concentrated solution to the second path of hot air of 0.16:1, and the desulfurization waste water concentrated solution and the second path of hot air are used for drying the desulfurization waste water concentrated solution by means of the pulsating desulfurization waste water concentrated solution and the hot air, so that the energy consumption of the whole device can be reduced.
In the drying chamber 7, four streams (two desulfurization waste water concentrates and two hot air streams) form a strongly turbulent flow state, and liquid-phase droplets fluctuate with the gas phase and rapidly spread. In the strong turbulent flow state, the two items are subjected to mass, momentum and energy exchange, the liquid phase is dried, and the gas phase is humidified.
The gas-solid mixture discharged from the discharging air pipe of the drying chamber 7 is sent to the secondary cyclone separator, the dried and solidified substance is captured by the cyclone separator, and the gas-solid mixture is discharged from the discharging hole of the cyclone separator, so that the resource utilization of the dried and solidified substance can be realized. Hot air discharged by the cyclone separator is sent to an inlet of a dust remover of the coal-fired power plant through a draught fan 9, and fine dry solidified matters which are not trapped by the cyclone separator are trapped by the dust remover of the coal-fired power plant and mixed with fly ash of the coal-fired power plant. The hot air for drying is mixed into the flue gas of the coal-fired power plant and is discharged after being purified along with the flue gas of the coal-fired power plant.
In this embodiment, for the desulfurization waste water concentrate having a salt content of 30%, the mass ratio of the desulfurization waste water concentrate to the dry gas stream is preferably 0.16:1.
in the embodiment, a certain amount of high-temperature high-pressure hot air is mixed into the desulfurization wastewater concentrated solution to form a gas-liquid mixed phase, and atomized liquid drops have a plurality of tiny bubbles, so that the mass and heat transfer surface area in the drying process is greatly increased, the mass and heat transfer efficiency is improved, and the drying time is shortened. On the other hand, the high-temperature high-pressure pulsating gas flow has strong concussion, so that the particle size of the atomized liquid drops is more uniformly distributed in the range of 60-100 mu m, and after the atomized gas-liquid mixed phase enters a drying chamber, the atomized gas-liquid mixed phase and the hot gas drying gas flow in front of a secondary hot air or an air preheater of a coal-fired power plant which is prepared into a cyclone flow state according to a certain liquid-gas ratio form a strong turbulence flow state in the drying chamber, and the liquid-phase liquid drops fluctuate and rapidly diffuse along with the gas phase to form a gas-liquid two-phase flow. Because of the momentum and temperature difference between the two phases, under the strong turbulence flow state, the two phases are subjected to intense mass, momentum and energy exchange, the liquid phase is dried, and the gas phase is humidified. Especially, a plurality of tiny bubbles exist in the atomized liquid-gas mixed phase, so that the mass and heat transfer surface area in the drying process is greatly increased, the convective drying speed is greatly increased, and the drying time can be shortened to hundreds or even tens of milliseconds.
As a result of the combined action of the two, the residence time of liquid drops in a drying chamber is greatly shortened, the volume evaporation intensity of the traditional pressure spray drying is about 12kg H2O/m & h, the maximum volume evaporation intensity of the embodiment can reach 217 kg H2O/m & h, and compared with the traditional pressure spray drying, the volume evaporation intensity is greatly improved, so that the volume and the manufacturing cost of drying equipment are reduced.
The heat energy consumption of the traditional pressure spray drying is about 5500KJ/kgH2O, and the heat energy consumption of the embodiment is about 3000-3500KJ/kgH2O, compared with the traditional pressure spray drying, the method reduces the consumption of secondary hot air of a coal-fired power plant or hot flue gas before an air preheater, which is required by drying, so that the energy consumption of a fan and the energy consumption of a heat source are reduced, and the energy consumption can be reduced by 36-45%.
Meanwhile, a certain amount of high-temperature high-pressure hot air is mixed into the desulfurization wastewater concentrated solution, so that a gas-liquid mixed phase is formed, and the problems of blockage, abrasion and the like of the atomizer are solved.
Claims (7)
1. A method for drying desulfurization waste water concentrated solution by pulsation spray drying, which is characterized in that the desulfurization waste water concentrated solution is dried and solidified by hot air, and is characterized in that: the method comprises the following steps:
1) Pressurizing the desulfurization wastewater concentrated solution to 2-7MPa; pressurizing hot air to 10-30KPa, and then modulating into 60-120 Hz pulsating hot air flow;
2) Pressurizing the desulfurization waste water concentrated solution and the pressurized pulsating hot air flow according to the following steps (1-2): 1, atomizing by a spraying device after mixing the liquid and gas mass ratios, modulating into vortex fluid by an airflow modulating device after atomizing, and entering a drying chamber for drying treatment; the gas-solid mixture discharged from the drying chamber is sent to a cyclone separator for gas-solid separation; the gas discharged by the cyclone separator is sent to the inlet of the dust remover of the coal-fired power plant by an induced draft fan and is further trapped and treated by the dust remover of the coal-fired power plant; the hot air is secondary hot air of a coal-fired power plant or hot flue gas before an air preheater;
the second desulfurization waste water concentrated solution and the second hot air are directly conveyed into a drying chamber through a pipeline to be dried, and the desulfurization waste water concentrated solution and the second hot air dry the desulfurization waste water concentrated solution by means of the pulsating desulfurization waste water concentrated solution and the hot air; the mass ratio of the second desulfurization wastewater concentrated solution to the second hot air liquid-air is (0.13-0.16): 1.
2. the desulfurization wastewater concentrate pulsating spray drying method according to claim 1, wherein: and purifying the hot flue gas before the secondary hot air or the air preheater by a gas filter, and then carrying out supercharging treatment.
3. The desulfurization wastewater concentrate pulsating spray drying method according to claim 2, characterized in that: the secondary hot air is pressurized to 30KPa, and the pulsation modulator modulates the hot air into a pulsation airflow of 83Hz, 100.51Hz or 117 Hz; the desulfurization wastewater concentrate is pressurized to 2MPa.
4. The desulfurization wastewater concentrate pulsating spray drying method according to claim 1, wherein: the pulsation spray drying device adopted by the method comprises a blower, a supercharging device, a spraying device, an air flow modulating device, a feed pump, a drying chamber, a cyclone separator, an induced draft fan and a pulsation device; the pulsation device, the spraying device and the airflow modulation device are arranged at the top of the drying chamber; the blower is sequentially connected with the supercharging device and the pulsation device through pipelines; the material supply pump is connected to the outlet of the pulsation device in the drying chamber through a pipeline; mixing the hot air and the desulfurization wastewater concentrated solution at the outlet of the pulsation device, and then spraying the mixture into a drying chamber through a spraying device and an airflow modulation device in sequence; the outlet of the drying chamber is sequentially connected with a cyclone separator and an induced draft fan; a purifying device is arranged in front of the pressurizing device.
5. The desulfurization wastewater concentrate pulsating spray drying method according to claim 4, wherein: the feed pump and the blower are also provided with pipes which are directly connected into the drying chamber.
6. The desulfurization wastewater concentrate pulsating spray drying method according to claim 4, wherein: the pulsation device is a pulsation valve.
7. The desulfurization wastewater concentrate pulsating spray drying method according to claim 4, wherein: the supercharging device is a supercharging fan, the spraying device is a centrifugal pressure type nozzle, and the purifying device is a gas filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010925896.XA CN111908536B (en) | 2020-09-07 | 2020-09-07 | Desulfurization wastewater concentrated solution pulsation spray drying method and drying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010925896.XA CN111908536B (en) | 2020-09-07 | 2020-09-07 | Desulfurization wastewater concentrated solution pulsation spray drying method and drying device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111908536A CN111908536A (en) | 2020-11-10 |
| CN111908536B true CN111908536B (en) | 2024-02-20 |
Family
ID=73267471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010925896.XA Active CN111908536B (en) | 2020-09-07 | 2020-09-07 | Desulfurization wastewater concentrated solution pulsation spray drying method and drying device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111908536B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115089985B (en) * | 2022-06-24 | 2024-02-27 | 胜利油田新邦石油科技有限责任公司 | Spray drying concentration equipment for preparing polyaluminium chloride compound serving as water treatment agent |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1351247A (en) * | 2000-11-01 | 2002-05-29 | 浙江吉利达化工有限公司 | Spray drying tower and processor drying alpha-ensulfonate |
| CN201532096U (en) * | 2009-11-17 | 2010-07-21 | 山东天力干燥设备有限公司 | Pulse combustion drying machine |
| CN104591461A (en) * | 2015-01-13 | 2015-05-06 | 广东海洋大学 | Integrated seawater desalination and salt production method and device |
| CN109626468A (en) * | 2019-02-14 | 2019-04-16 | 中国神华能源股份有限公司 | The processing system of desulfurization wastewater |
| CN210237178U (en) * | 2019-05-13 | 2020-04-03 | 西安协力动力科技有限公司 | Wastewater zero discharge device for performing multistage evaporation concentration evaporation by using boiler hot flue gas |
-
2020
- 2020-09-07 CN CN202010925896.XA patent/CN111908536B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1351247A (en) * | 2000-11-01 | 2002-05-29 | 浙江吉利达化工有限公司 | Spray drying tower and processor drying alpha-ensulfonate |
| CN201532096U (en) * | 2009-11-17 | 2010-07-21 | 山东天力干燥设备有限公司 | Pulse combustion drying machine |
| CN104591461A (en) * | 2015-01-13 | 2015-05-06 | 广东海洋大学 | Integrated seawater desalination and salt production method and device |
| CN109626468A (en) * | 2019-02-14 | 2019-04-16 | 中国神华能源股份有限公司 | The processing system of desulfurization wastewater |
| CN210237178U (en) * | 2019-05-13 | 2020-04-03 | 西安协力动力科技有限公司 | Wastewater zero discharge device for performing multistage evaporation concentration evaporation by using boiler hot flue gas |
Non-Patent Citations (1)
| Title |
|---|
| 脉动气流喷雾干燥的数值模拟;吴中华,刘相东;农业工程学报(04);第18-21页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111908536A (en) | 2020-11-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10472257B2 (en) | Efficient and energy-saving wastewater evaporation crystallizer | |
| CN107032428B (en) | System and method for zero emission treatment of undersaturated flue gas concentration crystallization desulfurization wastewater | |
| CN111362342A (en) | Wastewater zero discharge system and method for multi-stage treatment | |
| CN205676177U (en) | A kind of bypass flue gas fluidization desulfurization wastewater drying system | |
| CN111908536B (en) | Desulfurization wastewater concentrated solution pulsation spray drying method and drying device | |
| CN104998531B (en) | A kind of cement kiln flue gas SNCR denitration system | |
| CN107983059A (en) | Press mist theisen disintegrator | |
| CN206799197U (en) | A kind of undersaturation flue gas condensing crystallizing desulfurization wastewater zero-discharge treatment system | |
| CN109133234A (en) | A kind of desulfurization wastewater Zero discharging system | |
| CN101229466A (en) | Air purification method using wind and water mixing mechanism | |
| CN110605021A (en) | Humidification-activated desulfurization, denitrification and dust removal system and treatment method using same | |
| CN112479293A (en) | Wastewater and flue gas waste heat drying system and method based on semi-dry desulfurization tower | |
| CN210410179U (en) | Flue gas treatment system | |
| CN212269514U (en) | Desulfurization waste water concentrate pulsation spray drying device | |
| CN209383589U (en) | A kind of desulfurization wastewater multi-heat source coupled processing system | |
| CN201930709U (en) | Novel semi-dry process flue gas desulfurization device | |
| CN110455090A (en) | A kind of efficient swirling flow atomizing desulfurization and dust-removal method | |
| CN205419832U (en) | Energy -efficient waste water evaporated crystallizer | |
| CN101721907B (en) | Flue gas desulfurizing method for W-shaped multi-fluid alkaline spray generator | |
| CN106986401A (en) | A kind of method for treating desulfurized wastewater | |
| CN208927936U (en) | A kind of flue-gas dust-removing and desulfurization denitrification integrated device | |
| CN206810051U (en) | Desulfurization wastewater efficient concentration evaporates Zero emission device | |
| CN111099683A (en) | System and method for treating wastewater by evaporating and desulfurizing through drying tower | |
| CN106927469B (en) | Recovery system of chlorosilane waste liquid | |
| CN112853031A (en) | Converter primary flue gas particulate matter ultralow emission device and method |
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 | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 210023 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Applicant after: National Energy Group Science and Technology Research Institute Co.,Ltd. Applicant after: Guoneng Nanjing Electric Power Test Research Co.,Ltd. Address before: 210046 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Applicant before: GUODIAN SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. Applicant before: GUODIAN NANJING ELECTRIC POWER TEST RESEARCH Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |