CN112225280A - Desulfurization waste water advances in enhancement evaporation decrement system in indirect air cooling tower - Google Patents
Desulfurization waste water advances in enhancement evaporation decrement system in indirect air cooling tower Download PDFInfo
- Publication number
- CN112225280A CN112225280A CN202011158473.6A CN202011158473A CN112225280A CN 112225280 A CN112225280 A CN 112225280A CN 202011158473 A CN202011158473 A CN 202011158473A CN 112225280 A CN112225280 A CN 112225280A
- Authority
- CN
- China
- Prior art keywords
- water
- tower
- air cooling
- evaporation
- air
- 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
- 238000001704 evaporation Methods 0.000 title claims abstract description 91
- 230000008020 evaporation Effects 0.000 title claims abstract description 89
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 84
- 230000023556 desulfurization Effects 0.000 title claims abstract description 84
- 238000001816 cooling Methods 0.000 title claims abstract description 77
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 162
- 238000005399 mechanical ventilation Methods 0.000 claims abstract description 29
- 238000009826 distribution Methods 0.000 claims description 29
- 238000007789 sealing Methods 0.000 claims description 17
- 238000012856 packing Methods 0.000 claims description 16
- 238000005507 spraying Methods 0.000 claims description 15
- 230000002708 enhancing effect Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000011152 fibreglass Substances 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 13
- 238000003860 storage Methods 0.000 abstract description 4
- 238000005728 strengthening Methods 0.000 abstract description 2
- 239000003570 air Substances 0.000 description 133
- 238000012546 transfer Methods 0.000 description 15
- 230000001965 increasing effect Effects 0.000 description 14
- 239000010408 film Substances 0.000 description 9
- 208000028659 discharge Diseases 0.000 description 7
- 239000000945 filler Substances 0.000 description 6
- 238000004088 simulation Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000012080 ambient air Substances 0.000 description 5
- 238000009533 lab test Methods 0.000 description 5
- 239000002918 waste heat Substances 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram 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
- 239000007921 spray Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 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
- 230000004308 accommodation Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 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
- 238000007599 discharging Methods 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003546 flue gas Substances 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
- 239000012528 membrane Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002002 slurry 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
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
- C02F1/12—Spray evaporation
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a system for strengthening evaporation decrement of desulfurization wastewater in an indirect air cooling tower, wherein 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); mechanical draft waste water evaporation tower (18) bottom be provided with air intake (12), and the below of air intake (12) is provided with cistern (3), one side of mechanical draft waste water evaporation tower (18) be provided with circulating water pump (16), the inlet tube of the one end of circulating water pump (16) stretch into cistern (3), the other end is linked together with inlet tube (13) that set up in sealed panel (2) one side, it has overcome among the prior art that desulfurization waste water traditional treatment process has the initial investment height, and the high shortcoming of later stage working costs, has to receive the hydrophone through the two-layer high efficiency that sets up, ensures the advantage that the facility does not have the corruption on every side.
Description
Technical Field
The invention relates to the technical field of desulfurization wastewater of a thermal power plant, in particular to a system for strengthening evaporation and reduction 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: heat concentration, membrane concentration, electrodialysis concentration, direct flue spray evaporation, bypass flue spray evaporation and the like.
The table below shows the investment of the desulfurization wastewater zero-discharge facility of part of newly built units and the cost of water treatment per ton in recent years. Therefore, the traditional treatment process of the desulfurization wastewater 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 system 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: a desulfurization waste water enters an indirect air cooling tower and is enhanced to evaporate and reduce a system, which comprises a tower body, a sealing panel, a reservoir, a packing layer, a water distribution pipe, a water spraying nozzle, a high-efficiency water collector, a fan, a heightened exhaust barrel, a motor, a frame, an air inlet, a water inlet pipe, a stair, an indirect air cooling tower, a circulating water pump, an air cooling radiator, a mechanical draft waste water evaporation tower, a tower barrel and a drainage pump;
a circle of air cooling radiators are arranged on the outer side of the bottom of the indirect air cooling tower along the circumferential direction, and the extension of the upper vertex of each air cooling radiator is seamlessly connected with the air inlet through a steel plate;
a circulating water pump, a mechanical ventilation wastewater evaporation tower, a reservoir and a drainage pump are arranged in the indirect air cooling tower;
an air inlet is arranged at the bottom of the mechanical ventilation wastewater evaporation tower, a reservoir is arranged below the air inlet, a circulating water pump is arranged at one side of the mechanical ventilation wastewater evaporation tower, a water inlet pipe at one end of the circulating water pump extends into the reservoir, and the other end of the circulating water pump is communicated with a water inlet pipe arranged at one side of the sealing panel,
the opposite side of mechanical draft waste water evaporation tower be provided with the drain pump, the one end water pipe of drain pump stretch into to the cistern, the drain pipe of drain pump and external power plant in the reuse water pipe looks UNICOM of waste water.
In the above technical scheme: the mechanical draft wastewater evaporation tower is arranged in the indirect air cooling tower; a sealing panel, a reservoir, a packing layer, a water distribution pipe, a water spraying nozzle, a high-efficiency water collector, a fan, a heightened exhaust barrel, a motor, a frame, an air inlet, a water inlet pipe and a stair are arranged in a tower body of the mechanical draft wastewater evaporation tower;
the outer surface of the frame is wrapped with a sealing panel, a cylindrical heightening exhaust duct is arranged above the frame, a stair is arranged on one side of the frame, a motor is arranged on the top of the frame, the output end of the motor is connected with a fan,
two layers of the high-efficiency water collector are transversely arranged on the beam of the frame, water distribution pipes are arranged in the frame, each water distribution pipe is provided with a water spraying nozzle, a packing layer is transversely paved on the beam in the frame,
the efficient water collector, the water distribution pipe and the packing layer are arranged in a layered manner from top to bottom;
one side of sealing panel be provided with the inlet tube, the other end and the circulating water pump of inlet tube communicate with each other, frame bottom be provided with the air intake.
In the above technical scheme: the tower body adopts a reinforced concrete structure or a glass fiber reinforced plastic structure.
In the above technical scheme: the height of the heightened exhaust duct is greater than that of the air cooling radiator.
In the above technical scheme: the water inlet pipe is communicated with a water distribution pipe arranged in the water inlet pipe.
The invention has the following advantages:
1. compared with the traditional process, the invention saves more than 1600 ten thousand yuan, and the operation cost is only 20 percent of that of the conventional scheme; according to the performance test result of the demonstration project, the drift drop loss rate is only four hundred thousandths of a ten-thousandth, which is 10% of the standard limit, and the huge commercial value and the environmental protection performance are reflected.
2. The invention utilizes the filler in the filler layer to expand the desulfurization wastewater to form a water film shape, thereby effectively increasing the contact area of the desulfurization wastewater and air; the surface wind speed of the water film is effectively improved through the exhaust fan in the tower body; the temperature of the desulfurization wastewater is heated by utilizing high-temperature and low-humidity air in the tower body, waste heat in the indirect air cooling tower is effectively utilized, the temperature of the desulfurization wastewater is increased, the evaporation decrement of the desulfurization wastewater is more than 70%, the effective decrement of the desulfurization wastewater is realized, and a small amount of residual desulfurization wastewater can be consumed in a power plant without being discharged outside, so that the environmental pollution is avoided.
3. The desulfurization wastewater in the water storage tank is pumped and pressurized by a water pump after being continuously evaporated and concentrated, and is used for the procedures of slag salvaging machines, dry ash humidification and the like in a power plant for absorption, so that the absorption in the plant is realized without discharge.
4. The two-layer high-efficiency water collector is arranged to ensure that saline water droplets are discharged from the heightened air exhaust cylinder arranged at the top of the saline water droplet non-random force ventilation wastewater evaporation tower and to ensure that surrounding facilities are not corroded.
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
| Name of operating mode | |
|
| 2 machine 100% load, full | 861332KW | |
| 2 | 430666KW | |
| 2 | 258400KW | |
| 1 machine 100% load, half | 430666KW | |
| 1 |
215333KW |
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 more than 4m/s and the discharge height is less than 32m, the waste steam will flow through the radiator. It is therefore recommended that the discharge height be greater than 32 m.
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, a reinforced evaporation reduction system for sulfur wastewater entering an indirect air cooling tower is perfected, a demonstration project of the process system is built and put into operation in the Gansu Wuwei power plant in 2019, 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 system for enhancing evaporation decrement of desulfurization wastewater in an indirect air cooling tower comprises
The system 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 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 wastewater evaporation tower 18, a tower 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, ambient air flows into the indirect air cooling tower 15 after being heated by the air cooling radiators 17, the mechanical ventilation wastewater evaporation tower 18 is located 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 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,
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;
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 (5)
1. The utility model provides a desulfurization waste water advances in indirect air cooling tower and strengthens evaporation decrement system which characterized in that: the tower 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 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);
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 top point of the air cooling radiator (17) is seamlessly connected with the air inlet (12) through a steel plate;
a circulating water pump (16), a mechanical ventilation wastewater evaporation tower (18), a water reservoir (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), and 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 cistern (3), the drain pipe of drain pump (20) and external power plant in waste water reuse water pipe looks UNICOM.
2. The system for enhancing evaporation decrement of desulfurization waste water entering indirect air cooling tower of claim 1, wherein: 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 air exhaust barrel (9), a motor (10), a frame (11), an air inlet (12), an water inlet pipe (13) and a stair (14) are arranged in a tower body (1) of the mechanical ventilation 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 installed 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 laid 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).
3. A mechanical draft wastewater evaporation tower suitable for use in an air cooling tower according to claim 2, wherein: the tower body (1) is of a reinforced concrete structure or a glass fiber reinforced plastic structure.
4. A mechanical draft wastewater evaporation tower suitable for use in an air cooling tower according to claim 3, wherein: the height of the heightened exhaust duct (9) is greater than that of the air cooling radiator (17).
5. The mechanical draft wastewater evaporation tower suitable for use in an air cooling tower of claim 4, wherein: the water inlet pipe (13) is communicated with the water distribution pipe (5) arranged in the water inlet pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011158473.6A CN112225280A (en) | 2020-10-26 | 2020-10-26 | Desulfurization waste water advances in enhancement evaporation decrement system in indirect air cooling tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011158473.6A CN112225280A (en) | 2020-10-26 | 2020-10-26 | Desulfurization waste water advances in enhancement evaporation decrement system in indirect air cooling tower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112225280A true CN112225280A (en) | 2021-01-15 |
Family
ID=74109517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011158473.6A Pending CN112225280A (en) | 2020-10-26 | 2020-10-26 | Desulfurization waste water advances in enhancement evaporation decrement system in indirect air cooling tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112225280A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114684885A (en) * | 2022-03-21 | 2022-07-01 | 华电电力科学研究院有限公司 | A waste water enrichment facility for indirect air cooling tower of thermal power generating unit |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007121670A1 (en) * | 2006-04-21 | 2007-11-01 | Tsinghua University | An environment protecting and water saving cooling tower |
| CN204757734U (en) * | 2015-06-19 | 2015-11-11 | 金川集团股份有限公司 | Turbid water cooling tower of industry |
| 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 |
| 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 |
| CN112093954A (en) * | 2019-06-17 | 2020-12-18 | 绵阳吉华环境工程技术有限公司 | Concentration and separation device for air contact circulating wastewater |
-
2020
- 2020-10-26 CN CN202011158473.6A patent/CN112225280A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007121670A1 (en) * | 2006-04-21 | 2007-11-01 | Tsinghua University | An environment protecting and water saving cooling tower |
| CN204757734U (en) * | 2015-06-19 | 2015-11-11 | 金川集团股份有限公司 | Turbid water cooling tower of industry |
| 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 |
| CN112093954A (en) * | 2019-06-17 | 2020-12-18 | 绵阳吉华环境工程技术有限公司 | Concentration and separation device for air contact circulating wastewater |
Non-Patent Citations (1)
| Title |
|---|
| （苏）革拉特珂夫（В.А.ГЛАДКОВ）著，施健中译: "《机械通风冷却塔》", 31 May 1981, 化学工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114684885A (en) * | 2022-03-21 | 2022-07-01 | 华电电力科学研究院有限公司 | A waste water enrichment facility for indirect air cooling tower of thermal power generating unit |
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 | |
| CN106512637A (en) | Device and method for removing white smoke | |
| CN202927864U (en) | Waste-heat utilization system for desulfuration smoke dehumidification | |
| CN204973504U (en) | Nitrogen oxide waste gas treatment system | |
| CN210993628U (en) | Low-energy-consumption white smoke eliminating device with desulfurization efficiency improving function | |
| CN105056718A (en) | High-efficiency water-saving wet desulphurization absorption tower and application thereof | |
| 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 | |
| CN110864342A (en) | Water replenishing system and method for indirectly heating heat supply network by using low-temperature waste heat of flue gas | |
| CN209612249U (en) | A kind of water saving fixtures recycling wet desulfurization flue gas condensed water | |
| CN112225280A (en) | Desulfurization waste water advances in enhancement evaporation decrement system in indirect air cooling tower | |
| CN103277854B (en) | Evaporative cooling dehumidification air conditioner unit with waste heat recovery used for air compressor | |
| CN211119603U (en) | Water replenishing system for indirectly heating heat supply network by using low-temperature waste heat of flue gas | |
| CN211367032U (en) | Steam wet type self-condensation device for desulfurization wastewater zero-discharge system | |
| CN110559786A (en) | flue gas whitening system and method based on partial organic Rankine cycle | |
| CN104504981A (en) | Mine gas excess heat recovery experiment platform | |
| CN111435055B (en) | Method for completely eliminating cooling tower plume | |
| CN208320385U (en) | A kind of elimination white cigarette device for wet fuel gas desulfurizing technology | |
| CN204301556U (en) | A kind of nested type double tower body double flash evaporation cooling tower | |
| CN203717011U (en) | Device for fully utilizing return air waste heat of mine | |
| CN203355524U (en) | Spray tower | |
| CN112225279A (en) | Mechanical ventilation wastewater evaporation tower suitable for air cooling tower | |
| CN202040926U (en) | Wet film humidifier | |
| CN209771770U (en) | Wet curtain solution dehydrator |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210115 |