CN108178362A - A kind of desulfurization by lime gypsum method wastewater zero emission treatment method and system - Google Patents
A kind of desulfurization by lime gypsum method wastewater zero emission treatment method and system Download PDFInfo
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- CN108178362A CN108178362A CN201611124452.6A CN201611124452A CN108178362A CN 108178362 A CN108178362 A CN 108178362A CN 201611124452 A CN201611124452 A CN 201611124452A CN 108178362 A CN108178362 A CN 108178362A
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- slurries
- desulfurization
- gypsum
- belt machine
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- 239000010440 gypsum Substances 0.000 title claims abstract description 63
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 44
- 230000023556 desulfurization Effects 0.000 title claims abstract description 43
- 239000002351 wastewater Substances 0.000 title claims abstract description 35
- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 18
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 18
- 239000004571 lime Substances 0.000 title claims abstract description 18
- 239000002002 slurry Substances 0.000 claims abstract description 65
- 239000000706 filtrate Substances 0.000 claims abstract description 42
- 238000010521 absorption reaction Methods 0.000 claims abstract description 25
- 239000010883 coal ash Substances 0.000 claims abstract description 23
- 208000028659 discharge Diseases 0.000 claims abstract description 15
- 238000003828 vacuum filtration Methods 0.000 claims abstract description 9
- 238000002425 crystallisation Methods 0.000 claims abstract description 5
- 230000008025 crystallization Effects 0.000 claims abstract description 5
- 210000002966 serum Anatomy 0.000 claims description 31
- 238000002347 injection Methods 0.000 claims description 18
- 239000007924 injection Substances 0.000 claims description 18
- 235000013339 cereals Nutrition 0.000 claims description 17
- 241000220317 Rosa Species 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 235000007164 Oryza sativa Nutrition 0.000 claims description 4
- 235000009566 rice Nutrition 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 6
- 230000001737 promoting effect Effects 0.000 abstract description 3
- 239000003245 coal Substances 0.000 description 5
- 238000001914 filtration Methods 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 241000209094 Oryza Species 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000006071 cream Substances 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000370738 Chlorion Species 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000032258 transport Effects 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Sustainable Development (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to a kind of desulfurization by lime gypsum method wastewater zero emission treatment methods and system, this method to include the following steps：1) modified coal ash is added in filtrate box, the slurries in filtrate box are delivered to absorption tower；2) slurries exported after desulfurization in absorption tower are sent to hydraulic cyclone station, and the larger slurries of grain size flow to underflow outlet, and then downstream to vacuum belt machine, the smaller slurries of grain size flow to overflow outlet, then downstream to vacuum belt machine；3) slurries pass through the vacuum filtration of vacuum belt machine, after modified coal ash is rested on salinity crystallization on gypsum, are transported together with gypsum, the slurries outflow after vacuum filtration；4) slurries after being filtered by vacuum filtered are flow in filtrate box.Compared with prior art, the present invention can very easily desulfurization wastewater it is and simple for process into zero discharge treatment, can realize desulfurization wastewater zero-emission truly, there is promotional value.
Description
Technical field
The present invention relates to flue gases purification field, at a kind of desulfurization by lime gypsum method wastewater zero discharge
Manage method and system.
Background technology
China is a country using coal as main energy sources, coal fired power generation be the most important approach that utilizes of coal in China it
One.According to the national conditions in China, 21st century coal fired power generation will occupy an leading position.In the numerous big of fossil-fired unit discharge
In gas pollutant, SO2And dust is larger to the harm of environment, is the major pollutants to be controlled.With social progress and
Expanding economy, thermal power plant is to the pollution of atmospheric environment by people's common concern, therefore effectively reduce pollutant emission
It is the severe challenge that China's energy field sustainable development is faced with the influence improved to environment.
In China Today, the flue gas desulfurization technique used includes wet desulphurization, semi-dry desulphurization, dry desulfurization etc..
Wherein desulfurization method of limestone-gypsum technology due to desulfuration efficiency height, technology maturation, raw material are simple and easy to get and use the widest
It is general.Limestone-gypsum method flue gas desulfurization is also the technological process that domestic and international 80% or so large thermal power plant uses.Wet flue gas takes off
Sulphur system in the process of running, constantly accumulate, such as Cl by absorption tower slurries intermediate ion-、F-, mercury, lead, nickel, arsenic and chromium heavy metal from
Son etc. after these ions reach a certain concentration, can accelerate the corrosion of desulphurization plant and be brought sternly to the stability of desulphurization system
The harm of weight, and desulfurization wastewater direct emission endangers ecological environment very big, general chemistry precipitation treatment method complexity, and needs
Chemicals is constantly added, operating cost is high.Chlorine ion concentration in another desulfurization wastewater chemical treatment method treated waste water
It is almost unchanged.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of limestone-gypsum methods
Zero emission treatment of desulfured waste water and system, can very easily desulfurization wastewater is into zero discharge treatment, and simple for process, energy
Enough desulfurization wastewater zero-emissions realized truly, have promotional value.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of desulfurization by lime gypsum method wastewater zero emission treatment method includes the following steps：
1) modified coal ash is added in filtrate box, the slurries in filtrate box are delivered to absorption tower, with the stone in absorption tower
Cream slurries are sufficiently mixed, stir evenly；
2) slurries exported after desulfurization in absorption tower are sent to hydraulic cyclone station, are detached through hydraulic cyclone station, on the one hand, grain size
Larger slurries flow to underflow outlet, and then downstream to vacuum belt machine, on the other hand, the smaller slurries of grain size flow to overflow and go out
Mouthful, then downstream to vacuum belt machine；
3) slurries pass through the vacuum filtration of vacuum belt machine, on the one hand, modified coal ash rests on gypsum with salinity crystallization
After upper, transported together with gypsum, on the other hand, the slurries outflow after vacuum filtration；
4) be filtered by vacuum after slurries it is filtered flow in filtrate box, jump procedure 1).
In the step 3), the rotating speed of variable frequency adjustment vacuum belt machine so that the thickness of gypsum is maintained at 10-20mm.
In the step 2), the slurries exported after desulfurization in absorption tower are pumped to hydraulic cyclone station, frequency conversion through the first slurries
Adjust the rotating speed of the first slurries pump so that the operating pressure at hydraulic cyclone station is in 0.12-0.15MPa.
The grain size of the modified coal ash is 5-20 microns.
A kind of desulfurization by lime gypsum method Wastewater zero-discharge treatment system for realizing the above method includes hydraulic cyclone station, true
Empty belt feeder, the first slurries pump, filtrate box, filtrate tank, vacuum pump, underflow uniform device and overflow uniform device, on the Rose Box
Equipped with modified coal ash charge door, the injection point on the serum outlet connection absorption tower of Rose Box, the injection point of Rose Box connects
The serum outlet of filtrate tank, the serum outlet of the injection point connection vacuum belt machine of the filtrate tank are connect, the vacuum pump connects
Filtrate tank is connect, the injection point at the hydraulic cyclone station pumps the serum outlet on connection absorption tower, hydraulic cyclone by the first slurries
Stand bottom underflow outlet connection underflow uniform device injection point, the overflow outlet connection overflow at the top of hydraulic cyclone station is evenly distributed with
The injection point of device, the serum outlet of the underflow uniform device and the serum outlet of overflow uniform device are respectively positioned on vacuum belt machine
Top.
The transmission direction of the serum outlet of the underflow uniform device and the serum outlet of overflow uniform device along vacuum belt machine
It sets gradually.
Horizontal standoff distance is 0.6- between the serum outlet of the underflow uniform device and the serum outlet of overflow uniform device
1.2 rice.
The system further includes central controller and respectively the gypsum thickness detecting sensor and the of connection central controller
One frequency converter, the gypsum thickness detecting sensor are set on vacuum belt machine, and first frequency converter connects vacuum belt machine
Belt drive.
The system further includes press detection sensor and the second frequency converter, and the central controller is connected by the second frequency converter
The first slurries pump is connect, the press detection sensor is set in water conservancy rotational flow station.
Blender is equipped in the filtrate box, the blender is set on by height-adjustable component in filtrate box.
Using modified coal ash, the gypsum in desulfurization wastewater intensifies under effect the present invention, react with chlorion, generates and " take
Family name's salt ", and modified coal ash is to Cl-, heavy metal etc. have stronger physical and chemical adsorption ability, taken out with reference to vacuum belt machine vacuum
It inhales, crystallization forms salt crystal, recycles all kinds of impurity in the filtration removal filtrate of gypsic horizon, and gypsum is sent outside, filtrate
Absorption tower or lime stone pulping system are recycled to, achievees the purpose that zero-emission.
Compared with prior art, the present invention has the following advantages：
1st, the modified coal ash that grain size is 5-20 microns is added in absorption tower slurries by present system, in absorption tower
After being mixed with slurries, hydraulic cyclone station is pumped to, underflow is flow on vacuum belt machine, and hydraulic cyclone station overflow portion is flow to together
It on one vacuum belt machine, filters simultaneously, solid particulate material by filter-cloth filtering, collect to filtrate box by filtrate, is recycled to suction
Tower is received, filtrate water quality reaches the requirement of desulfurization method of limestone-gypsum water, realizes desulfurization wastewater zero-emission, can be very convenient
Desulfurization wastewater carry out zero discharge treatment, it is and simple for process, save manpower.
2nd, underflow uniform device and overflow uniform device realize the uniform sprinkling of slurries, the serum outlet of underflow uniform device and overflow
It is arranged on before and after the serum outlet of uniform device above vacuum belt machine, and keeps optimal spacing so that modified coal ash and stone
Cream comes into full contact with, and preferably eliminates all kinds of impurity in filtrate.
The 3rd, central controller is set, by gypsum thickness detecting sensor and the first frequency converter, variable frequency adjustment belt feeder turns
Speed efficiently controls the thickness of gypsum in 10-20mm, avoids vacuum belt machine rotating speed too fast and lead to modified coal ash and gypsum
The problem of time of contact in desulfurization wastewater is insufficient, poor filtration effect avoids vacuum belt machine rotating speed excessively slow and influences waste water
The problem of organic efficiency.
4th, also by press detection sensor and the second frequency converter, the first slurries of variable frequency adjustment pump turns central controller
Speed efficiently controls the operating pressure at hydraulic cyclone station in 0.12-0.15MPa, is conducive to hydraulic cyclone station grain size is larger
Gypsum slurries and the smaller gypsum slurries of grain size are detached to underflow outlet and overflow outlet, are fully connect with gypsum for modified coal ash
It touches and provides safeguard.
5th, existing limestone-gypsum FGD plant is made full use of, it is only necessary to a little change, you can realize desulfurization wastewater zero
Emission treatment.
6th, system structure of the invention is compact, and method is implemented simply, and can realize desulfurization wastewater zero truly
Discharge, not only environmental protection but also safety, had promotional value.
Description of the drawings
Fig. 1 is present system structure diagram；
Fig. 2 is the method for the present invention flow chart.
In figure：1st, hydraulic cyclone station, 2, vacuum belt machine, the 3, first slurries pump, 4, filtrate box, 5, filtrate tank, 6, vacuum
Pump, 7, underflow uniform device, 8, overflow uniform device, 9, modified coal ash charge door, 10, central controller, 11, gypsum Thickness sensitivity
Sensor, the 12, first frequency converter, 13, press detection sensor, the 14, second frequency converter, 15, blender, 16, height-adjustable
Component, the 17, second slurries pump, 18, manually-operated gate, 19, absorption tower.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
As shown in Figure 1, a kind of desulfurization by lime gypsum method Wastewater zero-discharge treatment system includes hydraulic cyclone station 1, vacuum
Belt feeder 2, the first slurries pump 3, filtrate box 4, filtrate tank 5, vacuum pump 6, underflow uniform device 7 and overflow uniform device 8, on Rose Box
Equipped with modified coal ash charge door 9, which uses to add in grain size as 5-20 microns of modification fine coal
The charge door of ash, is additionally provided with the dust hood for preventing dust, the serum outlet of Rose Box passes through the second slurries above charge door
The injection point on 17 connection absorption tower 19 of pump, the serum outlet of the injection point connection filtrate tank 5 of Rose Box, the slurry of filtrate tank 5
Liquid entrance connects the serum outlet of vacuum belt machine 2, and vacuum pump 6 connects filtrate tank 5, and the injection point at hydraulic cyclone station 1 passes through
The serum outlet on 3 connection absorption tower 19 of the first slurries pump, the underflow outlet connection underflow uniform device 7 of 1 bottom of hydraulic cyclone station
Injection point, the injection point of the overflow outlet connection overflow uniform device 8 at 1 top of hydraulic cyclone station, the slurries of underflow uniform device 7
The serum outlet of outlet and overflow uniform device 8 is respectively positioned on the top of vacuum belt machine 2.
The serum outlet of underflow uniform device 7 and the serum outlet of overflow uniform device 8 along vacuum belt machine 2 transmission direction according to
Secondary setting.Horizontal standoff distance is 0.6-1.2 between the serum outlet of underflow uniform device 7 and the serum outlet of overflow uniform device 8
Rice.
Optionally, which further includes central controller 10 and respectively the gypsum thickness inspection of connection central controller 10
11 and first frequency converter 12 of sensor is surveyed, gypsum thickness detecting sensor 11 is set on vacuum belt machine 2, and the first frequency converter 12 connects
Connect the belt drive of vacuum belt machine 2.PLC controller can be used in central controller 10, and gypsum thickness detecting sensor 11 can
Using upper and lower two laser displacement sensors to penetrating.
Optionally, which further includes 13 and second frequency converter 14 of press detection sensor, and central controller 10 passes through
Two frequency converters 14 connect the first slurries pump 3, and press detection sensor 13 is set in water conservancy rotational flow station.
Blender 15 is equipped in filtrate box 4, blender 15 is set on by height-adjustable component 16 in filtrate box 4, height
Ball screw arrangement can be used in adjustable component 16, and the stirring rod of blender 15 is arranged on the nut of ball screw structure, rolling
The screw rod connection motor of ballscrew structure, the height so as to fulfill the stirring rod of blender 15 is adjusted, to adapt in filtrate box 4 not
With the stirring demand of liquid level.
Manually-operated gate 18 before the injection point at hydraulic cyclone station 1 is set, is used in overhaul of the equipments.
As shown in Fig. 2, using the method that above system realizes the processing of desulfurization by lime gypsum method wastewater zero discharge include with
Lower step：
1) modified coal ash of 5-20 microns of grain size is added in filtrate box 4, the slurries in filtrate box 4 are delivered to absorption tower
Gypsum slurries in 19, with absorption tower 19 are sufficiently mixed, stir evenly that (in the present embodiment, the grain size selection 15 of modified coal ash is micro-
Rice)；
2) slurries exported after desulfurization in absorption tower 19 are sent to hydraulic cyclone station 1, are detached through hydraulic cyclone station 1, on the one hand,
The larger slurries of grain size flow to underflow outlet, and then downstream to vacuum belt machine 2, on the other hand, the smaller slurries of grain size are flow to
Overflow exports, then downstream to vacuum belt machine 2；
3) slurries pass through vacuum belt machine 2 vacuum filtration, on the one hand, the density of 5-20 microns of modified coal ash of grain size compared with
Gypsum is light, and flyash swims in gypsum slurries surface, 2 sizing liquor of vacuum belt machine through vacuum filtration, therefore flyash with
Salinity crystallization rests on gypsum surface, then the impurity in waste water is removed together with gypsum into gypsum storehouse, and A is true in Fig. 1
The gypsum that empty belt feeder 2 transports, on the other hand, the slurries outflow after vacuum filtration；
4) slurries after being filtered by vacuum are filtered to be flow in filtrate box 4, and gypsum is transported outward in gypsum storehouse, jump procedure 1), it is real
Existing gypsum slurries recycling.
In step 3), the rotating speed of variable frequency adjustment vacuum belt machine 2 so that the thickness of gypsum is maintained at 10-20mm (this implementation
In example, thickness selection 15mm), avoid 2 rotating speed of vacuum belt machine too fast and lead to modified coal ash and gypsum in desulfurization wastewater
Time of contact it is insufficient, the problem of poor filtration effect, avoid 2 rotating speed of vacuum belt machine excessively slow and influence asking for Sewage treatment efficiency
Topic.
In step 2), the slurries exported after desulfurization in absorption tower 19 are sent through the first slurries pump 3 to hydraulic cyclone station 1, frequency conversion
Adjust the rotating speed of the first slurries pump 3 so that the operating pressure at hydraulic cyclone station 1 (in the present embodiment, works in 0.12-0.15MPa
Pressure selects 0.13MPa), be conducive to hydraulic cyclone station 1 by the larger gypsum slurries of grain size and grain size smaller gypsum slurries point
From to underflow outlet and overflow outlet, come into full contact with and provide safeguard with gypsum for modified coal ash.
Claims (10)
1. a kind of desulfurization by lime gypsum method wastewater zero emission treatment method, which is characterized in that include the following steps：
1) modified coal ash is added in filtrate box (4), the slurries in filtrate box (4) are delivered to absorption tower (19), with absorption tower
(19) gypsum slurries in are sufficiently mixed, stir evenly；
2) slurries exported after absorption tower (19) interior desulfurization are sent to hydraulic cyclone station (1), are detached through hydraulic cyclone station (1), a side
Face, the larger slurries of grain size flow to underflow outlet, then downstream to vacuum belt machine (2), on the other hand, the smaller slurries of grain size
Overflow outlet is flow to, then downstream to vacuum belt machine (2)；
3) slurries pass through the vacuum filtration of vacuum belt machine (2), on the one hand, modified coal ash is rested on salinity crystallization on gypsum
Afterwards, it is transported together with gypsum, on the other hand, the slurries outflow after vacuum filtration；
4) the filtered filtrate box (4) that flow to of slurries after being filtered by vacuum is interior, jump procedure 1).
A kind of 2. desulfurization by lime gypsum method wastewater zero emission treatment method according to claim 1, which is characterized in that institute
It states in step 3), the rotating speed of variable frequency adjustment vacuum belt machine (2) so that the thickness of gypsum is maintained at 10-20mm.
A kind of 3. desulfurization by lime gypsum method wastewater zero emission treatment method according to claim 1, which is characterized in that institute
It states in step 2), the slurries exported after absorption tower (19) interior desulfurization pump (3) through the first slurries and send to hydraulic cyclone station (1), frequency conversion
Adjust the rotating speed of the first slurries pump (3) so that the operating pressure of hydraulic cyclone station (1) is in 0.12-0.15MPa.
A kind of 4. desulfurization by lime gypsum method wastewater zero emission treatment method according to claim 1, which is characterized in that institute
The grain size for stating modified coal ash is 5-20 microns.
5. a kind of desulfurization by lime gypsum method Wastewater zero-discharge treatment system for realizing method as described in claim 1, feature
It is, including hydraulic cyclone station (1), vacuum belt machine (2), the first slurries pump (3), filtrate box (4), filtrate tank (5), vacuum pump
(6), underflow uniform device (7) and overflow uniform device (8), the Rose Box are equipped with modified coal ash charge door (9), Rose Box
The injection point of serum outlet connection absorption tower (19), the serum outlet of the injection point connection filtrate tank (5) of Rose Box are described
The serum outlet of the injection point connection vacuum belt machine (2) of filtrate tank (5), vacuum pump (6) the connection filtrate tank (5), institute
The injection point for stating hydraulic cyclone station (1) pumps the serum outlet of (3) connection absorption tower (19), hydraulic cyclone station by the first slurries
(1) injection point of the underflow outlet connection underflow uniform device (7) of bottom, the overflow outlet connection at the top of hydraulic cyclone station (1)
The injection point of overflow uniform device (8), the serum outlet of the underflow uniform device (7) and the serum outlet of overflow uniform device (8)
It is respectively positioned on the top of vacuum belt machine (2).
A kind of 6. desulfurization by lime gypsum method Wastewater zero-discharge treatment system according to claim 5, which is characterized in that institute
State the serum outlet of underflow uniform device (7) and the serum outlet of overflow uniform device (8) along vacuum belt machine (2) transmission direction according to
Secondary setting.
A kind of 7. desulfurization by lime gypsum method Wastewater zero-discharge treatment system according to claim 6, which is characterized in that institute
It is 0.6-1.2 to state horizontal standoff distance between the serum outlet of underflow uniform device (7) and the serum outlet of overflow uniform device (8)
Rice.
8. a kind of desulfurization by lime gypsum method Wastewater zero-discharge treatment system according to claim 5, which is characterized in that should
System further include central controller (10) and respectively connection central controller (10) gypsum thickness detecting sensor (11) and
First frequency converter (12), the gypsum thickness detecting sensor (11) is on vacuum belt machine (2), first frequency converter
(12) belt drive of connection vacuum belt machine (2).
9. a kind of desulfurization by lime gypsum method Wastewater zero-discharge treatment system according to claim 8, which is characterized in that should
System further includes press detection sensor (13) and the second frequency converter (14), and the central controller (10) passes through the second frequency converter
(14) connection the first slurries pump (3), the press detection sensor (13) is in water conservancy rotational flow station.
10. a kind of desulfurization by lime gypsum method Wastewater zero-discharge treatment system according to claim 5, which is characterized in that
Blender (15) is equipped in the filtrate box (4), the blender (15) is by height-adjustable component (16) set on filtrate box
(4) in.
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| CN111732235A (en) * | 2020-07-21 | 2020-10-02 | 西安西热水务环保有限公司 | Coal-fired power plant desulfurization wastewater self-circulation zero-discharge system and method |
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