CN112456586A - Method for enhancing evaporation reduction of desulfurization wastewater in indirect air cooling tower - Google Patents
Method for enhancing evaporation reduction of desulfurization wastewater in indirect air cooling tower Download PDFInfo
- Publication number
- CN112456586A CN112456586A CN202011159955.3A CN202011159955A CN112456586A CN 112456586 A CN112456586 A CN 112456586A CN 202011159955 A CN202011159955 A CN 202011159955A CN 112456586 A CN112456586 A CN 112456586A
- Authority
- CN
- China
- Prior art keywords
- air
- water
- desulfurization wastewater
- tower
- wastewater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002351 wastewater Substances 0.000 title claims abstract description 135
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 103
- 230000023556 desulfurization Effects 0.000 title claims abstract description 103
- 238000001704 evaporation Methods 0.000 title claims abstract description 78
- 230000008020 evaporation Effects 0.000 title claims abstract description 77
- 238000001816 cooling Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 128
- 238000005399 mechanical ventilation Methods 0.000 claims abstract description 24
- 238000012546 transfer Methods 0.000 claims description 26
- 238000009826 distribution Methods 0.000 claims description 21
- 230000001965 increasing effect Effects 0.000 claims description 17
- 238000005507 spraying Methods 0.000 claims description 13
- 239000000945 filler Substances 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 4
- 230000004308 accommodation Effects 0.000 claims description 3
- 238000011946 reduction process Methods 0.000 claims description 3
- 239000000284 extract Substances 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 3
- 239000003570 air Substances 0.000 description 122
- 239000010408 film Substances 0.000 description 9
- 238000012856 packing Methods 0.000 description 9
- 238000007789 sealing Methods 0.000 description 7
- 208000028659 discharge Diseases 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000004088 simulation Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000009533 lab test Methods 0.000 description 5
- 239000012080 ambient air Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 241000736911 Turritella communis Species 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000009292 forward osmosis Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/138—Water desalination using renewable energy
- Y02A20/141—Wind power
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a method for enhancing evaporation decrement of desulfurization wastewater in an indirect air cooling tower, which comprises the following steps; firstly, the outside air is heated by an air cooling radiator (17) to form high-temperature and low-humidity air, the high-temperature and low-humidity air enters an indirect air cooling tower (15), the high-temperature and low-humidity air extracted by a fan (8) of a mechanical ventilation wastewater evaporation tower (18) enters a tower body (1) through an air inlet (12) arranged at the bottom, the defects that the traditional treatment process of desulfurization wastewater in the prior art has high initial investment and high later-stage running cost are overcome, and the device has the advantages that the surrounding facilities are not corroded through the arranged two layers of high-efficiency water collectors.
Description
Technical Field
The invention relates to the technical field of desulfurization wastewater treatment of thermal power plants, in particular to a method for enhancing evaporation decrement of desulfurization wastewater in an indirect air cooling tower.
Background
With the improvement of environmental protection requirements, a desulfurization device is required to be synchronously built in newly built power plants, and the most widely applied desulfurization method at present is a limestone-gypsum wet desulfurization process. Because the slurry is fully contacted with the flue gas in the desulfurization process, the discharged water of the desulfurization system contains salt and heavy metal with higher concentration. The desulfurization wastewater has high salt content and strong corrosivity, and is the most difficult wastewater to treat in a power plant.
In recent years, some newly built power plants are provided with desulfurization wastewater zero-discharge treatment facilities, and the common process route comprises the following steps: mechanical vapor compression (MVR) recycling technology, forward osmosis (MBC) concentration technology, electric ion membrane (electrodialysis) concentration technology, direct flue spray evaporation technology and bypass flue spray evaporation technology.
The table below shows the investment of the desulfurization wastewater zero-discharge facility of the newly built unit and the cost of water treatment per ton. Therefore, the traditional treatment process has the defects of high initial investment and high later-stage operation cost.
TABLE 1 comparison of economics of desulfurization wastewater treatment process
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provides a method for enhancing evaporation decrement of desulfurization wastewater in an indirect air cooling tower.
The purpose of the invention is implemented by the following technical scheme: the method for enhancing evaporation decrement of desulfurization wastewater in an indirect air cooling tower comprises the following steps;
firstly, the outside air is heated by an air cooling radiator to form high-temperature and low-humidity air which enters an indirect air cooling tower, the high-temperature and low-humidity air extracted by a fan of a mechanical draft wastewater evaporation tower is started to enter the tower body through an air inlet arranged at the bottom,
secondly, a circulating water pump is arranged on one side of the mechanical ventilation wastewater evaporation tower, the circulating water pump pumps the desulfurization wastewater to be treated in the water storage tank, then the desulfurization wastewater to be treated is pumped by the circulating water pump and enters a water distribution pipe arranged in the tower body from a water inlet pipe arranged on one side,
and thirdly, the desulfurization waste water uniformly sprayed in the second step is enabled to be spread to form a water film through a packing layer arranged below, meanwhile, the contact area of the desulfurization waste water and the air is increased, the air speed on the surface of the water film is increased by utilizing a fan arranged above, the air with high temperature and low humidity in the first step reversely flows with the desulfurization waste water, and the effect of high-efficiency evaporation and decrement of the desulfurization waste water is achieved through contact heat transfer and mass transfer.
Fourthly, the desulfurization wastewater after heat transfer with high temperature and low humidity and mass transfer evaporation concentration continuously falls down and is finally recycled to a reservoir arranged at the bottom;
contacting with the desulfurization waste water in the step III, absorbing moisture and increasing humidity of the air through heat transfer and mass transfer, continuously moving upwards, collecting a small amount of water droplets carried in the air by a high-efficiency water collector arranged above, and discharging the residual clean wet air from a barrel opening of a heightened exhaust barrel arranged at the top after being pressurized by a fan.
Sixthly, the desulfurization wastewater recovered to the reservoir arranged at the bottom in the step IV is finally extracted by the circulating water pump again, and the step V is a circulation step to realize the reduction process of the desulfurization wastewater.
In the above technical scheme: the humidity of the humid air in the fifth step is more than 90%.
In the above technical scheme: and when the salt content of the desulfurization wastewater in the step (c) is higher than 3.3 times of the raw water concentration of the desulfurization wastewater in the step (c), the drainage pump arranged on one side of the mechanical ventilation wastewater evaporation tower starts to work, and the drainage pump extracts the desulfurization wastewater in the step (c) to an external desulfurization wastewater reuse water pipe in the power plant for a slag conveyor and dry ash humidification for in-plant accommodation.
In the above technical scheme: each water distribution pipe is provided with a plurality of water spraying nozzles at equal intervals, and hot water is uniformly sprayed through the water spraying nozzles.
The invention has the following advantages: 1. the invention effectively reduces the initial investment by more than 1600 ten thousand yuan, and the operating cost is only 20 percent of that of the conventional scheme, as shown in Table 1.
2. According to the performance test result of the demonstration project, the loss rate of the floating drops is only 4 ten-thousandth, which is 10 percent of the standard limit value, and the huge commercial value and environmental protection performance are reflected.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a top view of the present invention.
FIG. 3 is a schematic structural view of a mechanical draft wastewater evaporation tower according to the present invention.
FIG. 4 is a cross-sectional view of a forced draft wastewater evaporation tower of the present invention.
Fig. 5 is a graph of a mechanical draft wastewater evaporation tower exhaust trace.
FIG. 6 is a diagram showing the heat and mass transfer law between the desulfurized wastewater and the high-temperature, low-humidity air.
In the figure: the device comprises a tower body 1, a sealing panel 2, a water storage tank 3, a packing layer 4, a water distribution pipe 5, a water spraying nozzle 6, a high-efficiency water collector 7, an exhaust fan 8, a heightened exhaust duct 9, a motor 10, a frame 11, an air inlet 12, a water inlet pipe 13, a stair 14, an indirect air cooling tower 15, a circulating water pump 16, an air cooling radiator 17, a mechanical ventilation wastewater evaporation tower 18, a tower barrel 19 and a drainage pump 20.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The technical principle is as follows: a large amount of waste heat of the steam turbine is finally exhausted to the atmosphere through the air cooling tower, and the air cooling tower is in a high-temperature and low-humidity environment state all the year round and has good evaporation conditions.
By additionally arranging the mechanical ventilation wastewater evaporation tower in the indirect air cooling tower, the waste heat in high-temperature low-humidity air in the air cooling tower can be effectively utilized, and the desulfurization wastewater evaporation decrement is more than 70%.
According to the evaporation theory, the enhanced evaporation can be realized by increasing the contact area of air and water, increasing the surface wind speed of a water film and increasing the water temperature.
The thin film filler (filler layer 4) is arranged in the mechanical ventilation wastewater evaporation tower (namely the tower body 1), so that the air-water contact area can be effectively increased; the arranged exhaust fan 8 ensures that the surface of the water film has higher wind speed; the high-temperature and low-humidity air 15 in the indirect air cooling tower is a natural heat source, and can effectively heat the desulfurization wastewater and improve the saturated steam pressure, thereby ensuring the efficient evaporation of the desulfurization wastewater.
The air temperature in the indirect air cooling tower 15 is far higher than the ambient air temperature, and calculation shows that the air temperature in the tower is higher than the ambient air temperature by more than 20 ℃; in winter, the temperature of the air in the tower is higher than that of the ambient air by more than 30 ℃, and the high-temperature and low-humidity environment of the air in the tower provides conditions for effective evaporation of the desulfurization wastewater.
According to the heat transfer theory, the increase of the evaporation capacity of the desulfurization wastewater can be realized by increasing the temperature of the desulfurization wastewater, increasing the surface wind speed of the desulfurization wastewater and increasing the contact area of the desulfurization wastewater and air.
The invention adopts the technical scheme that a mechanical draft waste water evaporation tower (comprising a tower body 1, a sealing panel 2, a packing layer 4, a water distribution pipe 5, a water spraying nozzle 6, a high-efficiency water collector 7, an exhaust fan 8, a heightened exhaust duct 9 and the like) is additionally arranged in an indirect air cooling tower, and the desulfurization waste water is unfolded into a water film shape by using the filler in the packing layer 4 in the evaporation tower, so that the contact area between the desulfurization waste water and air is effectively increased.
The surface wind speed of the water film is effectively improved by the exhaust fan 8 in the mechanical ventilation wastewater evaporation tower; the temperature of the desulfurization wastewater is heated by utilizing high-temperature and low-humidity air in the tower, waste heat is effectively recovered, the temperature of the desulfurization wastewater is increased, and the scheme can realize that the evaporation decrement of the desulfurization wastewater is more than 70%.
The desulfurization waste water generated in the operation process of the unit is sent into a desulfurization waste water evaporation reservoir 3 in an indirect air cooling tower 15, is sucked and pressurized by a desulfurization waste water circulating water pump 16, is sent into a mechanical ventilation waste water evaporation tower (namely the tower body 1) through a pipeline, is sprayed by a water distribution system, and is subjected to heat transfer and mass transfer with high-temperature and low-humidity air in the evaporation tower (namely the tower body 1) to realize evaporation decrement, and the desulfurization waste water after decrement concentration returns to the desulfurization waste water evaporation reservoir to enter next circulation. The desulfurization waste water in the desulfurization waste water reservoir is pumped and pressurized by a water pump and is sent out after being continuously evaporated and concentrated, and the desulfurization waste water is used for a slag conveyor of a power plant, dry ash humidification and the like to be consumed, so that the in-plant consumption is realized without discharge.
After the reinforced evaporation scheme of the desulfurization wastewater in the air cooling tower is provided, the feasibility of the scheme is further verified through laboratory test and three-dimensional numerical simulation, the evaporation rule of the desulfurization wastewater in high-temperature air is mastered, and the operating characteristics of the mechanical ventilation wastewater evaporation tower in the indirect air cooling tower are mastered.
(1) Laboratory testing
The invention also includes the following specific laboratory data: the desulfurization wastewater enters an indirect air cooling tower to strengthen an evaporation reduction system, and the heat and mass transfer rule of the desulfurization wastewater and high-temperature and low-humidity air is obtained through performance test in a laboratory.
The experiment is briefly described as follows: the heat and mass transfer rule of the desulfurization wastewater and high-temperature and low-humidity air is related to the shape of a liquid film in the filler, the falling speed, the air flow rate, the air temperature, the water temperature and the like, and the evaporation coefficient of the desulfurization wastewater is determined by an indoor test.
The laboratory test device includes: the air circulation system, the water circulation system, the measuring system and the water heating system are respectively as follows:
a water circulation system: the water is lifted to a heating system from the reservoir 3 through a circulating water pump 16 and then is sent to a water distribution device after being heated, the water distribution device is three water distribution pipes 5 with the diameter of 25mm, three water spraying nozzles 6 are arranged on each water distribution pipe 5 at equal distances, hot water is uniformly sprayed by the water spraying nozzles 6, and then the hot water flows through a measuring weir to measure the water quantity and returns to the reservoir 3 for recycling.
An air circulation system: the centrifugal exhaust fan 8 at the tail part of the test device sucks external air from an air inlet 12, and the external air is heated by an electric heater arranged in an air inlet pipe 8 to control the temperature of dry and wet balls at the inlet so as to meet the parameter requirement controlled by the test; after entering a test section of the tower (in the tower body 1) to perform air heat exchange with water, the air is discharged from the air pipe, part of the air at the outlet is discharged out of the room, and part of the air flows back to the air inlet so as to adjust the temperature of the wet bulb of the inlet air. The air quantity changes the rotation speed control of the direct current motor through the frequency converter.
The measurement system comprises: mainly include air parameter measurement system and circulating water parameter measurement system, the test parameter includes: inlet air dry bulb temperature, wet bulb temperature, and atmospheric pressure, wind speed, outlet air dry bulb temperature, and wet bulb temperature; the circulating water parameters include: inlet water temperature, outlet water temperature, and circulating water volume.
The evaporation capacity is calculated according to the moisture content difference between the air inlet and the air outlet. The moisture content can be determined from the atmospheric pressure, the dry bulb temperature and the wet bulb temperature.
And (3) a heat and mass transfer law diagram of the desulfurization wastewater and high-temperature and low-humidity air obtained through laboratory tests (as shown in figure 6).
(2) The desulfurization wastewater enters the enhanced evaporation decrement system in the indirect air cooling tower, and the working state of the mechanical ventilation wastewater evaporation tower in the indirect air cooling tower is researched through three-dimensional CFD numerical simulation.
The numerical simulation conditions include 3 meteorological conditions and 5 thermal loads, as shown in tables 1 and 2.
The calculation takes 5 wind speeds (0m/s, 2m/s, 4m/s, 6m/s and 8m/s) and the heights of the three exhaust chimneys (45m, 35m and 32m) into account.
For 100% load, analysis of 90 operating conditions was performed, including 45 full-tower operating conditions and 45 half-tower operating conditions.
For 50% load, an analysis of 38 operating conditions was performed, including 19 full-tower operating conditions, 19 half-tower operating conditions.
For 30% load, 24 working conditions were analyzed, including 12 full-tower operating conditions and 12 half-tower operating conditions.
TABLE 2 different weather parameters
| Name (R) | Atmospheric pressure | Temperature of dry bulb | Relative humidity | Temperature of water outlet |
| Average operating mode of year | 847hPa | 13.5℃ | 53％ | -- |
| Summer working condition | 840hPa | 30.5℃ | 60％ | -- |
| Working conditions in winter | 860hPa | -15.0℃ | 50％ | >30℃ |
TABLE 3 Indirect air cooling tower Heat load
Through numerical simulations, the following main conclusions were drawn: (1) the mechanical ventilation waste water evaporation tower is arranged in the indirect air cooling tower, and the high-temperature air in the indirect air cooling tower is utilized to evaporate the desulfurization waste water, so that the result shows that the ventilation quantity of the mechanical ventilation evaporation tower is 800m3The air volume/s only accounts for 1.5 percent of the ventilation volume of the indirect air cooling tower; the mechanical draft waste water evaporation tower has negligible effect on the cooling performance of the indirect air cooling tower.
(2) The temperature of air in the air cooling tower is higher than that outside the tower, the relative humidity is lower than that outside the tower, the relative humidity is below 30% throughout the year, and the influence of the desulfurization waste water steam on the relative humidity distribution in the indirect air cooling tower is small.
(3) Under the condition that the load is more than 30%, the desulfurization waste water steam is properly discharged in the annual average and summer working condition period, and at the moment, the desulfurization waste water steam does not flow through the air-cooled radiator, so that the corrosion to the interior of the tower is negligible.
(4) Under the condition of low temperature working condition (minus 10 ℃) in winter, waste liquid steam flows in the air cooling tower and is influenced by load. When the load is 100%, the waste liquid steam is not contacted with the radiator, and the system can normally run; when the load is less than 50%, the desulfurization wastewater steam contacts with the radiator, which is not beneficial to the discharge of the desulfurization wastewater evaporation tower and needs to be stopped for a short time.
(5) The higher the height of the exhaust funnel of the desulfurization waste water evaporation tower is, the higher the contact position of the exhaust with the inner wall surface of the air cooling tower shell is, and the smaller the contact area is.
When the ambient wind speed is greater than 4m/s and the discharge height is less than 32m, the effluent vapor will flow through the radiator, thus a discharge height greater than 32m is recommended.
Exhaust trace graph of mechanical draft waste water evaporation tower (as shown in figure 6)
The desulfurization wastewater enters an enhanced evaporation decrement system in an indirect air cooling tower, and the rule of heat transfer and mass transfer between the desulfurization wastewater and high-temperature low-humidity air is obtained through laboratory tests;
the scheme of heightening the exhaust barrel is determined through numerical simulation, and the exhaust of the mechanical draft wastewater evaporation tower is ensured to smoothly converge into the ascending airflow of the air cooling tower; the two-layer high-efficiency water collector 7 is arranged to ensure that saline water drops do not overflow the mechanical ventilation wastewater evaporation tower along with exhaust gas, and ensure that surrounding facilities are not corroded.
Through laboratory tests and numerical simulation, the enhanced evaporation and decrement system of the sulfur wastewater entering the indirect air cooling tower is perfected, the demonstration project of the process system is built and put into operation in a certain power plant in Gansu province, and the operation effect is excellent, as shown in Table 4.
Comparing table 1, the present invention has achieved commercial success at a reduced investment, a design capacity of 20(t/h) for treated water, a reduced investment per ton of water, and a reduced price per ton of water treatment compared to an equivalent power plant.
Referring to FIGS. 1-5: a desulfurization waste water enters an indirect air cooling tower and is enhanced to evaporate and reduce a system, which comprises a tower body 1, a sealing panel 2, a reservoir 3, a packing layer 4, a water distribution pipe 5, a water spraying nozzle 6, a high-efficiency water collector 7, a fan 8, a heightened air exhaust barrel 9, a motor 10, a frame 11, an air inlet 12, a water inlet pipe 13, a stair 14, an indirect air cooling tower 15, a circulating water pump 16, an air cooling radiator 17, a mechanical ventilation waste water evaporation tower 18, a tower barrel 19 and a drainage pump 20;
a circle of air cooling radiators 17 are arranged on the outer side of the bottom of the indirect air cooling tower 15 along the circumferential direction,
the extension of the upper vertex of the air cooling radiator 17 is seamlessly connected with the air inlet 12 through a steel plate;
ambient air is heated by the air cooling radiator 17 and then flows into the indirect air cooling tower 15, the mechanical ventilation wastewater evaporation tower 18 is positioned in a high-temperature and low-humidity environment in the indirect air cooling tower 15, and the mechanical ventilation wastewater evaporation tower 18 sucks high-temperature air through the air inlet 12 to achieve the purpose of evaporating the desulfurization wastewater;
a circulating water pump 16, a mechanical ventilation wastewater evaporation tower 18, a water storage tank 3 and a drainage pump 20 are arranged in the indirect air cooling tower 15;
an air inlet 12 is arranged at the bottom of the mechanical ventilation wastewater evaporation tower 18, a reservoir 3 is arranged below the air inlet 12, a circulating water pump 16 is arranged at one side of the mechanical ventilation wastewater evaporation tower 18, a water inlet pipe at one end of the circulating water pump 16 extends into the reservoir 3, the other end of the circulating water pump is communicated with a water inlet pipe 13 arranged at one side of the sealing panel 2,
the opposite side of mechanical draft waste water evaporation tower 18 be provided with drain pump 20, the one end water pipe of drain pump 20 stretch into to cistern 3, drain pipe and the external power plant of drain pump 20 in the reuse water pipe looks UNICOM of waste water.
The mechanical draft waste water evaporation tower 18 is arranged in the indirect air cooling tower 15; a sealing panel 2, a reservoir 3, a packing layer 4, a water distribution pipe 5, a water spraying nozzle 6, a high-efficiency water collector 7, a fan 8, a heightened exhaust barrel 9, a motor 10, a frame 11, an air inlet 12, a water inlet pipe 13 and a stair 14 are arranged in a tower body 1 of the mechanical draft wastewater evaporation tower 18;
the outer surface of the frame 11 is wrapped with a sealing panel 2, a cylindrical heightening exhaust duct 9 is arranged above the frame 11, a stair 14 is arranged on one side of the frame 11, a motor 10 is arranged at the top of the frame 11, the output end of the motor 10 is connected with a fan 8,
two layers of the high-efficiency water collector 7 are transversely arranged on the beam of the frame 11, water distribution pipes 5 are arranged in the frame 11, each water distribution pipe 5 is provided with a water spraying nozzle 6, a layer of packing layer 4 is transversely paved on the beam in the frame 11,
the high-efficiency water collector 7, the water distribution pipe 5 and the packing layer 4 are arranged in a layered manner from top to bottom;
one side of the sealing panel 2 is provided with a water inlet pipe 13, the other end of the water inlet pipe 13 is communicated with a circulating water pump 16, and the bottom of the frame 11 is provided with an air inlet 12.
The tower body 1 is of a reinforced concrete structure or a glass fiber reinforced plastic structure; the height of the heightened exhaust duct 9 is greater than that of the air cooling radiator 17; the water inlet pipe 13 is communicated with the water distribution pipe 5 arranged in the water distribution pipe.
The invention also comprises the following specific working processes: the method for enhancing evaporation decrement of desulfurization wastewater in an indirect air cooling tower comprises the following steps;
firstly, the outside air is heated by an air cooling radiator 17 to form air with high temperature and low humidity, then the air with high temperature and low humidity is heated to enter an indirect air cooling tower 15, the air with high temperature and low humidity extracted by a fan 8 of a mechanical draft waste water evaporation tower 18 is started to enter a tower body 1 through an air inlet 12 arranged at the bottom,
secondly, a circulating water pump 16 is arranged on one side of the mechanical ventilation wastewater evaporation tower 18, the circulating water pump 16 pumps the desulfurization wastewater to be treated in the reservoir 3, then the desulfurization wastewater to be treated is pumped by the circulating water pump 16 and enters a water distribution pipe 5 arranged in the tower body 1 from a water inlet pipe 13 arranged on one side,
a plurality of water spraying nozzles 6 are arranged on each water distribution pipe 5 at equal intervals, and hot water is uniformly sprayed through the water spraying nozzles 6;
and thirdly, the desulfurization waste water uniformly sprayed in the second step is spread to form a water film through the packing layer 4 arranged below, the contact area of the desulfurization waste water and the air is increased, the air speed on the surface of the water film is increased by using the fan 8 arranged above, the air with high temperature and low humidity in the first step reversely flows with the desulfurization waste water, and the effect of high-efficiency evaporation and reduction of the desulfurization waste water is achieved through contact heat transfer and mass transfer.
Fourthly, the desulfurization wastewater after heat transfer with high temperature and low humidity and mass transfer evaporation concentration continuously falls down and is finally recycled to a reservoir 3 arranged at the bottom;
contacting with the desulfurization wastewater in the step III, absorbing moisture and increasing humidity of air through heat transfer and mass transfer, continuously moving upwards, collecting a small amount of water droplets carried in the air by a high-efficiency water collector 7 arranged above, and discharging the residual clean wet air from a barrel opening of a heightened exhaust barrel 9 arranged at the top after being pressurized by a fan 8;
sixthly, the desulfurization wastewater recovered to the reservoir 3 arranged at the bottom in the step IV is finally extracted by the circulating water pump 16 again, and the step IV-V is circulated to realize the reduction process of the desulfurization wastewater.
The humidity of the humid air in the fifth step is more than ninety percent; when the salt content of the desulfurization wastewater in the step (c) is higher than 3.3 times of the raw water concentration of the desulfurization wastewater in the step (c), the drainage pump 20 arranged on one side of the mechanical ventilation wastewater evaporation tower 18 starts to work, and the drainage pump 20 pumps the desulfurization wastewater in the step (c) to an external desulfurization wastewater reuse water pipe in the power plant for the purposes of slag dragging the machine and humidifying dry ash for in-plant accommodation.
The above-mentioned parts not described in detail are prior art.
Claims (4)
1. The method for enhancing evaporation decrement of desulfurization wastewater in the indirect air cooling tower is characterized by comprising the following steps: it comprises the following steps;
firstly, the outside air is heated by an air cooling radiator (17) to form high-temperature and low-humidity air, the high-temperature and low-humidity air enters an indirect air cooling tower (15), the high-temperature and low-humidity air extracted by a fan (8) of a mechanical ventilation wastewater evaporation tower (18) enters a tower body (1) through an air inlet (12) arranged at the bottom,
secondly, a circulating water pump (16) is arranged on one side of the mechanical ventilation wastewater evaporation tower (18), the circulating water pump (16) extracts the desulfurization wastewater to be treated in the reservoir (3), then the desulfurization wastewater to be treated is extracted by the circulating water pump (16) and enters a water distribution pipe (5) arranged in the tower body (1) from a water inlet pipe (13) arranged on one side,
enabling the desulfurization wastewater uniformly sprayed in the step II to spread to form a water film through a filler layer (4) arranged below, increasing the contact area of the desulfurization wastewater and air, and improving the air speed on the surface of the water film by using a fan (8) arranged above, wherein the air with high temperature and low humidity in the step I and the desulfurization wastewater reversely flow and transfer heat and mass through contact;
fourthly, the desulfurization wastewater after being subjected to heat transfer with high temperature and low humidity and mass transfer evaporation concentration continuously falls down and is finally recycled into a reservoir (3) arranged at the bottom;
fifthly, the air is contacted with the desulfurization wastewater in the step III, and the air after absorbing moisture and increasing humidity continues to move upwards through heat transfer and mass transfer, a small amount of water drops carried in the air are collected by a high-efficiency water collector (7) arranged above the air, and the residual clean and wet air is pressurized by a fan (8) and then is discharged from a barrel opening of a heightened air exhaust barrel (9) arranged at the top of the air exhaust barrel;
sixthly, the desulfurization wastewater recovered to the reservoir (3) arranged at the bottom in the step IV is finally extracted again by a circulating water pump (16), and the reduction process of the desulfurization wastewater is realized in the circulating step V-V.
2. The method for enhancing evaporation decrement of desulfurization waste water entering indirect air cooling tower according to claim 1, characterized in that: the humidity of the humid air in step (v) is greater than ninety percent.
3. The method for enhancing evaporation decrement of desulfurization waste water entering the indirect air cooling tower according to claim 1 or 2, characterized in that: and when the salt content of the desulfurization wastewater in the step (c) is higher than 3.3 times of the raw water concentration of the desulfurization wastewater in the step (c), a drainage pump (20) arranged on one side of the mechanical ventilation wastewater evaporation tower (18) starts to work, and the drainage pump (20) pumps the desulfurization wastewater in the step (c) to an external desulfurization wastewater reuse water pipe in the power plant for humidifying a slag conveyor and dry ash to perform in-plant accommodation.
4. The method for enhancing evaporation decrement of desulfurization waste water entering indirect air cooling tower according to claim 3, characterized in that: each water distribution pipe (5) is provided with a plurality of water spraying nozzles (6) at equal intervals, and hot water is uniformly sprayed through the water spraying nozzles (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011159955.3A CN112456586A (en) | 2020-10-26 | 2020-10-26 | Method for enhancing evaporation reduction of desulfurization wastewater in indirect air cooling tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011159955.3A CN112456586A (en) | 2020-10-26 | 2020-10-26 | Method for enhancing evaporation reduction of desulfurization wastewater in indirect air cooling tower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112456586A true CN112456586A (en) | 2021-03-09 |
Family
ID=74834515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011159955.3A Pending CN112456586A (en) | 2020-10-26 | 2020-10-26 | Method for enhancing evaporation reduction of desulfurization wastewater in indirect air cooling tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112456586A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114573061A (en) * | 2022-02-28 | 2022-06-03 | 中国水利水电科学研究院 | External desulfurization waste liquid treatment system based on natural draft wet cooling tower |
| CN114573062A (en) * | 2022-02-28 | 2022-06-03 | 中国水利水电科学研究院 | Desulfurization waste liquid treatment method based on natural ventilation wet cooling tower |
| CN114656005A (en) * | 2022-02-28 | 2022-06-24 | 中国水利水电科学研究院 | Built-in desulfurization waste liquid treatment system based on natural draft wet cooling tower |
| CN114835182A (en) * | 2022-05-11 | 2022-08-02 | 国能宁夏鸳鸯湖第一发电有限公司 | Desulfurization wastewater treatment device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106629946A (en) * | 2016-12-05 | 2017-05-10 | 中国电力工程顾问集团中南电力设计院有限公司 | Desulfurization wastewater treatment integrated facility and desulfurization wastewater treatment method applicable to indirect air-cooling towers |
| WO2018000774A1 (en) * | 2016-06-29 | 2018-01-04 | 淄博环能海臣环保技术服务有限公司 | Opening and closing switchable air-cooled cool water-type machine cooling tower for air-cooled radiator and operating mode of same |
| CN208008493U (en) * | 2018-02-08 | 2018-10-26 | 西安协力动力科技有限公司 | A kind of equipment that flue residue heat is used for Waste Water From Fire Power Plant zero discharge treatment |
| CN208599198U (en) * | 2018-07-26 | 2019-03-15 | 北京能为科技股份有限公司 | Infant industry evaporating column |
| CN208688286U (en) * | 2018-06-05 | 2019-04-02 | 成武金硕药业化工有限公司 | A kind of modular cooling tower device |
| CN210150894U (en) * | 2019-12-24 | 2020-03-17 | 山东蓝想环境科技股份有限公司 | Efficient energy-saving zero-emission treatment device |
-
2020
- 2020-10-26 CN CN202011159955.3A patent/CN112456586A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018000774A1 (en) * | 2016-06-29 | 2018-01-04 | 淄博环能海臣环保技术服务有限公司 | Opening and closing switchable air-cooled cool water-type machine cooling tower for air-cooled radiator and operating mode of same |
| CN106629946A (en) * | 2016-12-05 | 2017-05-10 | 中国电力工程顾问集团中南电力设计院有限公司 | Desulfurization wastewater treatment integrated facility and desulfurization wastewater treatment method applicable to indirect air-cooling towers |
| CN208008493U (en) * | 2018-02-08 | 2018-10-26 | 西安协力动力科技有限公司 | A kind of equipment that flue residue heat is used for Waste Water From Fire Power Plant zero discharge treatment |
| CN208688286U (en) * | 2018-06-05 | 2019-04-02 | 成武金硕药业化工有限公司 | A kind of modular cooling tower device |
| CN208599198U (en) * | 2018-07-26 | 2019-03-15 | 北京能为科技股份有限公司 | Infant industry evaporating column |
| CN210150894U (en) * | 2019-12-24 | 2020-03-17 | 山东蓝想环境科技股份有限公司 | Efficient energy-saving zero-emission treatment device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114573061A (en) * | 2022-02-28 | 2022-06-03 | 中国水利水电科学研究院 | External desulfurization waste liquid treatment system based on natural draft wet cooling tower |
| CN114573062A (en) * | 2022-02-28 | 2022-06-03 | 中国水利水电科学研究院 | Desulfurization waste liquid treatment method based on natural ventilation wet cooling tower |
| CN114656005A (en) * | 2022-02-28 | 2022-06-24 | 中国水利水电科学研究院 | Built-in desulfurization waste liquid treatment system based on natural draft wet cooling tower |
| CN114573061B (en) * | 2022-02-28 | 2023-08-15 | 中国水利水电科学研究院 | External desulfurization waste liquid treatment system based on natural ventilation wet cooling tower |
| CN114573062B (en) * | 2022-02-28 | 2023-08-15 | 中国水利水电科学研究院 | Desulfurization waste liquid treatment method based on natural ventilation wet cooling tower |
| CN114656005B (en) * | 2022-02-28 | 2023-08-15 | 中国水利水电科学研究院 | Built-in desulfurization waste liquid treatment system based on natural ventilation wet cooling tower |
| CN114835182A (en) * | 2022-05-11 | 2022-08-02 | 国能宁夏鸳鸯湖第一发电有限公司 | Desulfurization wastewater treatment device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112456586A (en) | Method for enhancing evaporation reduction of desulfurization wastewater in indirect air cooling tower | |
| CN108465368A (en) | Desulfurization and dedusting disappears white device for deep cleaning | |
| CN204923035U (en) | Processing system is synthesized to coal fired boiler's flue gas | |
| CN202927864U (en) | Waste-heat utilization system for desulfuration smoke dehumidification | |
| CN106512637A (en) | Device and method for removing white smoke | |
| CN110864342A (en) | Water replenishing system and method for indirectly heating heat supply network by using low-temperature waste heat of flue gas | |
| CN204593692U (en) | The straight swollen composite type energy-saving air-conditioning system of evaporative cooling-refrigerant | |
| CN206037754U (en) | Accuse temperature water conservation fog dispersal device | |
| CN207928911U (en) | A kind of wet plume elimination system | |
| CN209612249U (en) | A kind of water saving fixtures recycling wet desulfurization flue gas condensed water | |
| CN201578867U (en) | Solution concentration device | |
| CN206001971U (en) | A kind of demisting water collection device used for cooling tower and demisting cooling tower | |
| CN112225280A (en) | Desulfurization waste water advances in enhancement evaporation decrement system in indirect air cooling tower | |
| CN203100472U (en) | Closed-type heat accumulating and cooling dual-purpose tower with defrosting function | |
| CN211119603U (en) | Water replenishing system for indirectly heating heat supply network by using low-temperature waste heat of flue gas | |
| CN101762177B (en) | Natural-draught brine cooling tower | |
| CN211367032U (en) | Steam wet type self-condensation device for desulfurization wastewater zero-discharge system | |
| CN111435055B (en) | Method for completely eliminating cooling tower plume | |
| CN208320385U (en) | A kind of elimination white cigarette device for wet fuel gas desulfurizing technology | |
| CN110559786A (en) | flue gas whitening system and method based on partial organic Rankine cycle | |
| CN203717011U (en) | Device for fully utilizing return air waste heat of mine | |
| CN204301556U (en) | A kind of nested type double tower body double flash evaporation cooling tower | |
| CN109114840B (en) | Absorption heat pump treatment equipment | |
| CN208088010U (en) | Papermaking drying portion exhaust air deodorization takes off bletilla afterheat utilizing system | |
| CN112225279A (en) | Mechanical ventilation wastewater evaporation tower suitable for air cooling tower |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210309 |
|
| RJ01 | Rejection of invention patent application after publication |