CN106587239A - Wastewater concentrating system and method utilizing flue gas waste heat and based on liquid column evaporation - Google Patents
Wastewater concentrating system and method utilizing flue gas waste heat and based on liquid column evaporation Download PDFInfo
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- CN106587239A CN106587239A CN201710054360.3A CN201710054360A CN106587239A CN 106587239 A CN106587239 A CN 106587239A CN 201710054360 A CN201710054360 A CN 201710054360A CN 106587239 A CN106587239 A CN 106587239A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 164
- 238000001704 evaporation Methods 0.000 title claims abstract description 122
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 239000003546 flue gas Substances 0.000 title claims abstract description 64
- 230000008020 evaporation Effects 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000007788 liquid Substances 0.000 title abstract description 6
- 239000002918 waste heat Substances 0.000 title abstract description 5
- 238000005507 spraying Methods 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims description 52
- 239000007921 spray Substances 0.000 claims description 45
- 239000003517 fume Substances 0.000 claims description 27
- 230000003009 desulfurizing effect Effects 0.000 claims description 19
- 239000000779 smoke Substances 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000009834 vaporization Methods 0.000 claims description 5
- 230000008016 vaporization Effects 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 3
- 235000019504 cigarettes Nutrition 0.000 claims 1
- 230000005619 thermoelectricity Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 34
- 238000006477 desulfuration reaction Methods 0.000 abstract description 14
- 230000023556 desulfurization Effects 0.000 abstract description 11
- 238000012546 transfer Methods 0.000 abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000004065 wastewater treatment Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 239000010908 plant waste Substances 0.000 description 3
- 238000010025 steaming Methods 0.000 description 3
- 238000013517 stratification Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000001223 reverse osmosis Methods 0.000 description 2
- 239000006200 vaporizer Substances 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
- B01D2252/103—Water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a wastewater concentrating system and method utilizing flue gas waste heat and based on liquid column evaporation. The system comprises an evaporation tower and is characterized in that the evaporation tower is arranged on one side of the gas inlet end of a desulfurization tower and communicated with the desulfurization tower; the evaporation tower is provided with a spraying area inside, the spraying area comprises a plurality of vertical liquid column spraying orifices used for spraying wastewater, flue gas enters the evaporation tower through the flue gas inlet of the evaporation tower and transfers heat and mass with the wastewater sprayed by the liquid column spraying orifices vertical to or intersecting with the flue gas, the wastewater evaporates after absorbing heat to generate steam which enters the flue gas, the flue gas flows out through the flue gas outlet of the evaporation tower and enters the desulfurization tower, the liquid column spraying orifices are connected with a wastewater storage tank, the evaporation tower is connected with the wastewater storage tank, and the evaporated wastewater enters the wastewater storage tank so as to achieve wastewater circulating concentration. The wastewater concentrating system has the advantages that flue gas waste heat is utilized on the basis that boiler efficiency loss is avoided, the problem of blocking is avoided, wastewater treatment quantity is lowered greatly, desulfurization water and water replenishing are reduced greatly, energy and water are saved, and huge economic and environmental benefits are produced.
Description
Technical field
The present invention relates to energy and environment field, more particularly to a kind of waste water of utilization fume afterheat based on fluid column evaporation is dense
Compression system and method.
Background technology
Coal fired thermal power plant is the rich and influential family of China's water for industrial use, and its water consumption and displacement are very huge, in water for industrial use
About 40% is used for coal fired thermal power plant, and the annual draining of coal fired thermal power plant accounts for the 10% of national industrial undertaking's discharge capacity.As water is provided
The growing tension in source and environmental requirement it is increasingly strict, the water saving of coal-fired power plant subtracts dirty imperative.Coal-fired power plant's waste water
Zero-emission can be minimum utilization water resource, to greatest extent reduce or do not carry out wastewater disposition, with good environment
Benefit and economic benefit.Wastewater zero discharge is realized, finally needs waste water to solidify, curing process includes function of mechanical steam recompression
(MVR) and high-temperature flue gas spray evaporation, its investment and operating cost are directly related with wastewater treatment capacity.
Waste water MVR evaporative crystallization techniques at home and abroad have been obtained for widely studied and practical application, using in vaporizer
The indirect steam of generation, the compression of Jing compressors, pressure, temperature are raised, and heat content increases, be then delivered to the heating chamber of vaporizer as
Plus vapourss are used, the heating of feed liquid to be evaporated is carried out, and add vapourss itself to be then condensed into water.Steam latent heat obtains abundant profit
With while reclaiming condensed water, salinity realizes that solidification is reclaimed in water.The technology maturation reliability, but investment cost and processing cost
Height, typically with Waste water concentrating technique connected applications, while MVR vapo(u)rization systems are higher to water quality requirement.
At present, in the handling process of coal-burning power plant's waste water, gradually received using high-temperature flue gas spray evaporation coal-burning power plant waste water
To concern, will spray evaporation technology be used for the advanced treating of wet flue gas coal-burning power plant waste water, in boiler back end ductwork air
Region between preheater and cleaner unit arranges atomizer, and coal-burning power plant's waste water is pumped in atomizer, sprays into and divides
In being scattered to high-temperature flue gas environment, after absorbing flue gas heat, waste water atomized drop is evaporated to water vapour and discharges with flue gas, former
Dry ash and solidss in waste water is then suspended in flue gas and enters into electric cleaner and caught by electrode, finally outer with flying dust
Row.But during high-temperature flue gas spray evaporation, the extraction of high-temperature flue gas have lost part boiler efficiency, increased power plant
Coal consumption, extract high-temperature flue gas amount depend on spray into wastewater flow rate.
Either MVR technologies or high-temperature flue gas spray evaporation technology, its investment and operating cost are and wastewater treatment capacity
Directly related, the concentration for realizing waste water is very necessary.Current main flow concentration technique is reverse osmosis membrane technology, reverse osmosis membrane
Operation it is higher to the water quality requirement of waste water.Calcium ions and magnesium ions are high in coal-burning power plant's waste water, need to be adjusted by flocculation sediment, pH value,
The techniques such as ion exchange resin realize waste water except hard, its pretreatment expense is very high.On the other hand, coal-fired plant flue gas waste heat
Not yet it is fully used, if Waste water concentrating can be realized using fume afterheat, the cost of wastewater zero discharge will be substantially reduced.
The content of the invention
An object of the present disclosure is to provide a kind of Waste water concentrating system of utilization fume afterheat based on fluid column evaporation, the system
By arranging evaporating column, there is no heat-transfer surface in the mode for taking fluid column to evaporate in evaporating column, without the need for pretreatment,
Overcome nozzle in spray evaporation easily block, wall dust stratification the problems such as.
Second purpose of the invention is to provide a kind of Waste water concentrating method of utilization fume afterheat based on fluid column evaporation, the method
Middle coal-burning power plant's waste water evaporation and concentration under fume afterheat, can substantially reduce the treating capacity of waste water, cost-effective；Smoke absorption
Desulphurization system is entered after the moisture of part, unit can reduce desulfurization water rate of water make-up；Flue-gas temperature into desulphurization system is reduced,
Desulfuration efficiency can be improved.
In order to reach above-mentioned purpose, first technical scheme that the present invention is provided：
A kind of Waste water concentrating system of utilization fume afterheat based on fluid column evaporation, including：
Evaporating column, evaporating column is connected located at the side of desulfurizing tower inlet end and with desulfurizing tower；Spraying zone is set in evaporating column,
The fluid column spray orifice for spraying waste water that spraying zone is vertically arranged including several, flue gas enters same from the smoke inlet of evaporating column
The waste water heat and mass sprayed by fluid column spray orifice that is vertical with flue gas or intersecting, waste water absorbs heat of vaporization and produces vapor entrance
In flue gas, exited in desulfurizing tower by evaporating column exhanst gas outlet, fluid column spray orifice is connected with wastewater holding chamber, evaporating column with it is useless
Waste water after the connection evaporation of water storage pool realizes that waste water circulation is concentrated into wastewater holding chamber, or the waste water after evaporation is directly from steaming
Send out tower to discharge.
In the Waste water concentrating system, flue gas and waste water heat and mass decreasing temperature and increasing humidity, using fume afterheat, waste water is by heat exchange
Heat is extracted, water vapour is flashed to, thus waste water be concentrated, while flue-gas temperature is reduced, greatly make use of fume afterheat, kept away
Thermal waste, part SO are exempted from2Can be absorbed；By flue gas and the waste water water column perpendicular contact of fluid column spray orifice injection, it is possible to decrease
The pressure loss, flue gas enters desulphurization system after evaporating column interior suction receiving portions moisture, and unit can reduce desulfurization water rate of water make-up；
Flue-gas temperature into desulphurization system is reduced, and can further improve desulfuration efficiency；Additionally, in evaporating column, flue gas release heat
Temperature reduces absorbing moisture simultaneously, and fluid column absorbs heat of vaporization, i.e. fluid column surface intensification evaporation and flue gas cool-down humidification process.Return
Receipts utilize fume afterheat for the fluid column evaporation and concentration of coal-burning power plant's waste water, achieve significant energy-saving effect and economic benefit,
Avoid the problem of pretreatment in conventional water treatment, overcome nozzle easily block, wall dust stratification the problems such as.
Wherein, for the contact area for increasing flue gas and waste water in evaporating column, the two ends of the evaporating column are smaller in size than
Size in the middle part of evaporating column, evaporating column can be formed by flue duct retrofit before desulfurizing tower, also can be realized by bypassing.
The fluid column spray orifice is located at the bottom of the spraying zone, after the waste water of such fluid column spray orifice injection sprays upward and certainly
By falling bodies, increase time of contact of the waste water with flue gas and contact area.If flue gas intersects setting, intersecting angle with fluid column spray orifice
Between 60 °～120 °.
Further, multiple fluid column spray orifices are arranged in parallel in a row, and fluid column spray orifice arrangement is according to crossed array
Either matrix arrangement or fan-shaped array are arranged.
Waste water circulation pump is set on the fluid column spray orifice and the connecting line of wastewater holding chamber, waste water circulation pump enters to waste water
Row supercharging, so as to fluid column spray orifice sprays in evaporating column water column is formed, and accelerates evaporation of the waste water in evaporating column, additionally, at this
Effusion meter, thermocouple and pressure gauge are set on connecting line.
The exhanst gas outlet of the evaporating column is connected with described desulfurizing tower, and in the exhanst gas outlet of evaporating column demister is arranged,
Demister is used to stop that drop is carried that flue gas to enter desulfurizing tower body after demister.
In this scenario, the bottom of evaporating column arranges the second pipeline and connects with wastewater holding chamber, and concentrated solution is back to water storage
Pond, and constantly circulate.
The present invention provide alternative plan be：
A kind of Waste water concentrating method of utilization fume afterheat based on fluid column evaporation, in the inlet end of desulfurizing tower evaporation is arranged
Tower, flue gas is entered from the smoke inlet of evaporating column, the waste water injection direction being pressurized sprayed by fluid column spray orifice in evaporating column
Vertical with flue gas direction, waste water and flue gas heat and mass, waste water absorbs the vapor that heat of vaporization produces and enters in flue gas, from steaming
Send out tower flue gas outlet to exit in desulfurizing tower.
In the above-mentioned methods, the waste water is pressurized to after 0.1-0.5MPa and is injected in evaporating column.
The waste water of the fluid column spray orifice injection is highly less than evaporating column top wall 0.5-1m, to prevent waste water to be sprayed onto evaporation
Tower wall face causes fouling, corrosion etc., jetting height to realize by adjusting spray flow, pressure etc..
Demister is set in the exhanst gas outlet of the evaporating column, and demister can be horizontal type, chevron shaped, V-shape, X
Type or perforating etc..
Additionally, the evaporating column is connected by the first pipeline with wastewater holding chamber, waste water circulation is set on the first pipeline
Pump, effusion meter, thermocouple and pressure gauge；
Further, the smoke inlet in evaporating column is respectively provided with temperature point and pressure-measuring-point with exhanst gas outlet；
The evaporation tower bottom is additionally provided with the second pipeline to discharge waste water, equally, in order to the waste water after evaporation and concentration
It is monitored, it is same on the second pipeline that effusion meter, thermocouple and pressure gauge are set.
So, waste water can be concentrated into evaporating column repeatedly by waste water circulation pump, be concentrated to after finite concentration and discharged；When one
When secondary evaporation capacity reaches concentration ratio requirement (concentration ratio sets, and can be obtained by online TDS monitorings), evaporating column
Outlet waste water is expelled directly out, and does not enter back into wastewater holding chamber circulating and evaporating, for this purpose, the bottom of evaporating column arranges at least two band valves
The wastewater outlet of door a, wastewater outlet is connected with wastewater holding chamber, and another is connected with subsequent treatment process.
The present invention has advantages below：
1), there is no heat-transfer surface in coal-burning power plant's waste water and flue gas direct contact heat transfer, without the need for pretreatment, gram
Taken nozzle in spray evaporation easily block, wall dust stratification the problems such as；
2) coal-burning power plant's waste water evaporation and concentration under fume afterheat, can substantially reduce the treating capacity of waste water, cost-effective；
3) desulphurization system is entered after the moisture of smoke absorption part, unit can reduce desulfurization water rate of water make-up；
4) by flue gas and waste water water column perpendicular contact, to SO2There is certain clearance；
5) investment and operating cost are relatively low, it is only necessary to increase an evaporating column, or realize that water column is sprayed by the former flue of transformation,
Operating cost is only the power consumption of pump.
6) present invention make use of fume afterheat on the basis of do not lose boiler efficiency, it is to avoid blockage problem, drop significantly
The treating capacity of low waste water and desulfurization water moisturizing, takes into account raising desulfuration efficiency and part removes SO2, reduce desulfurization pressure tower, energy
Energy-saving and water-saving effect is enough reached, huge economic benefit and environmental benefit is produced.
Description of the drawings
Waste water concentrating system diagrams (highly enriched ratio) of the Fig. 1 using fume afterheat based on fluid column evaporation, wherein, 1- evaporating columns,
2- spraying zones, 3- fluid column spray orifices, 4- demisters, 5- desulfurizing tower bodies, 6- waste water circulation pumps, 7- wastewater holding chambers, 8- waste water row
Go out pump
Waste water concentrating system diagrams (low cocnentration factor) of the Fig. 2 using fume afterheat based on fluid column evaporation, wherein, 1- evaporating columns,
2- spraying zones, 3- spraying zone spray orifices, 4- demisters, 5- desulfurizing tower bodies, 6- waste water circulation pumps, 7- wastewater holding chambers, 8- waste water
Excavationg pump.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Whole description.
Evaporating column smoke inlet and outlet are respectively arranged with temperature and pressure measuring point, for monitoring flue gas, the flue gas of evaporating column 1
Outlet is provided with demister 4；Exhanst gas outlet is connected with desulfurizing tower body 5, has spraying zone 2 in the evaporating column 1, is provided with difference
The fluid column spray orifice 3 of arrangement mode；Flue gas intersects that setting is vertical or intersecting setting with fluid column spray orifice, if flue gas intersects with fluid column spray orifice
Arrange, intersecting angle sets between 60 °～120 ° between the waste water inlet of 1 spraying zone of the evaporating column 2 and wastewater holding chamber 7
Be equipped with waste water circulation pump 6, effusion meter, thermocouple, pressure gauge, for monitoring evaporation and concentration before wastewater flow, temperature, pressure, with
Temperature into the waste water in evaporating column 1, pressure and flow are controlled, it is to avoid temperature is too high, the too small situation of pressure；Institute
State the wastewater outlet of evaporating column 1 and be arranged on evaporation tower bottom, can be connected with wastewater holding chamber 7 by the first pipeline, also can be by the
Two pipelines are discharged and are for further processing, and are set on the first pipeline and the second pipeline and are provided with effusion meter, thermocouple, pressure gauge,
The flow of waste water, temperature, pressure after for monitoring evaporation and concentration, as depicted in figs. 1 and 2.
The exhanst gas outlet of the evaporating column 1 is provided with demister 4, for stopping that drop is carried, with Desulphurization for Coal-fired Power Plant tower sheet
Body phase connects；
The evaporating column 1 can be formed by flue duct retrofit before desulfurizing tower, be carried out according to field condition and wastewater treatment capacity size
It is determined that, flue is typically arranged horizontally before desulfurization, is realized by increasing the height at flue center；May also be arranged on bypass；
The arrangement of fluid column spray orifice 3 classification has crossed array, matrix arrangement, fan-shaped array etc.；
In Waste water concentrating system of the above-mentioned utilization fume afterheat based on fluid column evaporation, waste water can be anti-by waste water circulation pump 6
Concentrate into evaporating column again, be concentrated to after finite concentration and discharge；When flush distillation amount reaches concentration ratio requirement, evaporating column goes out
Mouth waste water is expelled directly out by the second pipeline, does not enter back into the circulating and evaporating of wastewater holding chamber 7.
Additionally, the Waste water concentrating method using a kind of utilization fume afterheat of said apparatus based on fluid column evaporation, including such as
Lower step：
1) coal-burning power plant's waste water is concentrated by pipeline and is stored in wastewater holding chamber 7, is pressurized to by waste water circulation pump 6
After 0.1-0.5MPa, Jing spraying zones 2 spray into evaporating column 1；
2) flue gas direct contact heat transfer mass transfer of the waste water in fluid column form in evaporating column 1 with 100-150 DEG C, using flue gas
Waste heat is evaporated concentration；
3) waste water evaporation in evaporating column 1, water vapour enters desulfurizing tower with flue gas after demister 4.
4) waste water after concentrating reenters wastewater holding chamber 7 by the outlet at bottom of evaporating column 1, can pass through waste water circulation pump
6 reenter evaporating column 1 concentrates, and after concentration to a certain extent, is discharged by waste water excavationg pump 8, is for further processing；When one
When secondary evaporation capacity reaches concentration ratio requirement, the outlet waste water of evaporating column 1 is expelled directly out, and does not enter back into wastewater holding chamber circulation and steams
Send out.
The step 1) in enter fluid column wastewater flow rate need to according to actual operation parameters determine (actual parameter include waste water temperature
Degree, flue gas flow, flue-gas temperature, concentration ratio, spray orifice arrangement etc.).
The step 2) in the evaporation capacity of waste water be by wastewater temperature, flue-gas temperature, flue gas flow rate, spray orifice arrangement etc.
What factor determined jointly.
Embodiment 1：
By taking 300MW unit concentration cycles water as an example.Mark condition flue gas flow is about 1000000Nm3/ h flows are 100t/h, complete
Salt amount squeezes into evaporating column spraying zone for coal-burning power plant's recirculated water draining Jing waste water circulation pumps of 3000mg/L, is sprayed into by spray orifice and is steamed
Fa Tanei and flue gas direct contact heat transfer mass transfer, waste water enters wastewater holding chamber by the outlet of evaporating column bottom after concentration, leads to
Cross the concentration of waste water circulation pump further circulating and evaporating, it is to be concentrated to total salt quantity be 60000mg/L, wastewater flow be 5t/h, pass through
Waste water excavationg pump is discharged, and is for further processing.
Embodiment 2：
By taking 300MW units concentration desulfurization wastewater as an example.Mark condition flue gas flow is about 1000000Nm3/ h, flow be 10t/h,
Total salt quantity squeezes into evaporating column spraying zone for the Desulphurization for Coal-fired Power Plant waste water Jing waste water circulation pumps of 30000mg/L, is sprayed into by spray orifice
With flue gas direct contact heat transfer mass transfer in evaporating column, after concentration waste water total salt quantity be 150000mg/L, flow be 2t/h, by steaming
The outlet for sending out tower bottom is expelled directly out, and is for further processing.From unlike the technological process of embodiment 1, it is dense that waste water needs
When contracting ratio is relatively low, the concentration waste water of evaporating column outlet need not be circulated concentration into wastewater holding chamber, directly by waste water
Excavationg pump is discharged, into next step process.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
Various modifications to embodiment will be apparent for those skilled in the art, as defined herein general
Principle can in other embodiments be realized without departing from the spirit or scope of the present invention, is not described in detail
The part presented with partial enlargement, is prior art, and here is not repeated.Therefore, the present invention is not intended to be limited to herein
These shown embodiments, and it is to fit to the most wide scope consistent with principles disclosed herein and feature.
Claims (10)
1. the Waste water concentrating system that a kind of utilization fume afterheat is evaporated based on fluid column, it is characterised in that include：
Evaporating column, evaporating column is connected located at the side of desulfurizing tower inlet end and with desulfurizing tower；Spraying zone, spray are set in evaporating column
The fluid column spray orifice for spraying waste water that area is vertically arranged including several, flue gas enters same and cigarette from the smoke inlet of evaporating column
The vertical or intersecting waste water heat and mass sprayed by fluid column spray orifice of gas, waste water absorbs heat of vaporization generation vapor and enters flue gas
In, being exited in desulfurizing tower by evaporating column exhanst gas outlet, fluid column spray orifice is connected with wastewater holding chamber, and evaporating column is stored up with waste water
Deposit the waste water after the connection evaporation of pond and realize that waste water circulation is concentrated into wastewater holding chamber, or the waste water after evaporation is directly from evaporating column
Discharge.
2. the Waste water concentrating system that a kind of utilization fume afterheat as claimed in claim 1 is evaporated based on fluid column, it is characterised in that
The two ends of the evaporating column are smaller in size than the size in the middle part of evaporating column.
3. the Waste water concentrating system that a kind of utilization fume afterheat as claimed in claim 1 is evaporated based on fluid column, it is characterised in that
The fluid column spray orifice is located at the bottom of the spraying zone；
Further, fluid column spray orifice arrangement according to crossed array, either arrange by matrix arrangement or fan-shaped array.
4. the Waste water concentrating system that a kind of utilization fume afterheat as claimed in claim 1 is evaporated based on fluid column, it is characterised in that
Waste water circulation pump is set on the fluid column spray orifice and the connecting line of wastewater holding chamber.
5. the Waste water concentrating system that a kind of utilization fume afterheat as claimed in claim 1 is evaporated based on fluid column, it is characterised in that
The exhanst gas outlet of the evaporating column is connected with described desulfurizing tower, and in the exhanst gas outlet of evaporating column demister is arranged.
6. a kind of Waste water concentrating method that utilization fume afterheat is evaporated based on fluid column, it is characterised in that in the inlet end of desulfurizing tower
Evaporating column is set, and flue gas is entered from the smoke inlet of evaporating column, the waste water being pressurized sprayed by fluid column spray orifice in evaporating column
Injection direction is vertical with flue gas direction, waste water and flue gas heat and mass, and waste water absorbs vapor that heat of vaporization produces from evaporation
Tower flue gas outlet is exited in desulfurizing tower, and the waste water after evaporation enters wastewater holding chamber, can be further by waste water circulation pump
Circulation concentration, also can be discharged by waste water excavationg pump.
7. the Waste water concentrating method that a kind of utilization fume afterheat as claimed in claim 6 is evaporated based on fluid column, it is characterised in that
The waste water is pressurized to 0.1-0.5MPa.
8. the Waste water concentrating method that a kind of utilization fume afterheat as claimed in claim 6 is evaporated based on fluid column, it is characterised in that
The waste water of the fluid column spray orifice injection is highly less than evaporating column top wall 0.5-1m.
9. the Waste water concentrating method that a kind of utilization fume afterheat as claimed in claim 6 is evaporated based on fluid column, it is characterised in that
The evaporating column is connected by the first pipeline with wastewater holding chamber, and waste water circulation pump, effusion meter, thermoelectricity are arranged on the first pipeline
Even summation pressure gauge；
Further, the smoke inlet in evaporating column is respectively provided with temperature point and pressure-measuring-point with exhanst gas outlet.
10. the Waste water concentrating method that a kind of utilization fume afterheat as claimed in claim 9 is evaporated based on fluid column, its feature exists
In the evaporation tower bottom is additionally provided with the second pipeline to discharge waste water.
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| CN201710054360.3A CN106587239A (en) | 2017-01-24 | 2017-01-24 | Wastewater concentrating system and method utilizing flue gas waste heat and based on liquid column evaporation |
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| CN109110846A (en) * | 2018-08-22 | 2019-01-01 | 盛发环保科技（厦门）有限公司 | A kind of desulfurization wastewater flue gas concentration decrement and cement fixed system and technique |
| CN111032576A (en) * | 2016-08-31 | 2020-04-17 | 威马克泰克私人有限公司 | Evaporator with a heat exchanger |
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