CN106336077A - System and method for treating low-rank coal pyrolysis sewage - Google Patents
System and method for treating low-rank coal pyrolysis sewage Download PDFInfo
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- CN106336077A CN106336077A CN201610841923.9A CN201610841923A CN106336077A CN 106336077 A CN106336077 A CN 106336077A CN 201610841923 A CN201610841923 A CN 201610841923A CN 106336077 A CN106336077 A CN 106336077A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C37/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring
- C07C37/68—Purification; separation; Use of additives, e.g. for stabilisation
- C07C37/685—Processes comprising at least two steps in series
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- 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
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- 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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- 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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- 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
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- 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
- C02F1/5281—Installations for water purification using chemical agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1263—Sequencing batch reactors [SBR]
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Abstract
The invention provides a system and a method for treating low-rank coal pyrolysis sewage. The system for treating the low-rank coal pyrolysis sewage, provided by the invention, comprises an oil removal unit, a precipitating unit, a phenol and ammonia removal unit, an ammonia nitrogen recycling unit, an acidification treatment unit, a phenol extracting unit and a biochemical treatment unit. The precipitating unit is connected with each of the oil removal unit and the phenol and ammonia removal unit; the ammonia nitrogen recycling unit is connected with each of the phenol and ammonia removal unit and the acidification treatment unit; the phenol extracting unit is connected with each of the acidification treatment unit and the biochemical treatment unit; the biochemical treatment unit is also connected with the phenol and ammonia removal unit. According to the system and method provided by the invention, sewage produced by a low-rank coal pyrolysis process is treated effectively in a targeted manner; utilizable resources in the sewage are recycled.
Description
Technical field
The present invention relates to Industrial Waste Water Treatments are and in particular to a kind of process processes system and the side of low order pyrolysis of coal sewage
Method.
Background technology
China's low-order coal rich reserves, account for coal resources total amount more than 50%.Low order pyrolysis of coal is very big using having
Market prospect, it will become the following important energy of China and support.Semicoke, coal gas, tar can be produced after low order pyrolysis of coal.
Coal fast pyrogenation sewage is that coal reclaims the process generation such as refined in fast pyrogenation, pyrolysis coal gas reclaiming clean and chemical products
Sewage is referred to as, and wherein contain a large amount of pollutant, such as volatile phenol, contain cyanogen compound, ammonia nitrogen etc., this pollutant toxicity is big, difficult drops
Solution, processing cost is high, unprocessed and be directly discharged in natural water will serious environment pollution, indirect hazard human health
Existence.For this kind of sewage, conventional treatment technology has physical-chemical process, biological treatment and method of chemical treatment.
Biochemical treatment process is the main method processing pyrolysis of coal sewage, has that treatment scale is big, processing cost is low, water outlet water
The advantages of matter is high.But biochemical process is higher to sewage quality requirement, such as b/c value (bod/cod value) is higher than 0.3, ammonia nitrogen, volatile phenol
It is maintained at low concentration level Deng toxic substance concentration.This makes being used alone of biological treatment be restricted, and often only uses
Pretreatment in sewage.
Physical-chemical process both can have as the method for sewage disinfection treatment it is also possible to be applied to the advanced treating of sewage
Sewage quality is required with the advantages of low, process load is high, treatment effeciency is high, but processing cost is higher, and the requirement to equipment
Higher, therefore cannot obtain large-scale use.
Find and pollute the low, handling process of efficiency high, low cost, be to process mainly grinding of coal fast pyrogenation sewage at present
Study carefully direction, be also beneficial to realize the pyrolysis near-zero release of sewage and recycling of water resource, meet economy and society is sustainable
The demand of development.
Content of the invention
For solving the above problems, the invention provides a kind of process the system of low order pyrolysis of coal sewage and utilize this system
The method processing low order pyrolysis of coal sewage.
According to an aspect of the present invention, the invention provides a kind of process low order pyrolysis of coal sewage system, its
Including oil removing unit, precipitation unit, dephenolize deamination unit, ammonia nitrogen recovery unit, acidification unit, phenol extraction cells and life
Change processing unit；
Described oil removing unit is provided with pyrolysis sewage inlet, pyrolysis coke entrance and oil removing outlet of sewer；
Described precipitation unit is provided with oil removing sewage inlet, flocculant entrance and precipitation outlet of sewer, and described oil removing sewage enters
Mouth is connected with described oil removing outlet of sewer；
Described dephenolize deamination unit is provided with precipitation sewage inlet, dephenolize deamination outlet of sewer and the steam (vapor) outlet containing ammonia containing phenol,
Described precipitation sewage inlet is connected with described precipitation outlet of sewer；
Described ammonia nitrogen recovery unit be provided with steam inlet, containing phenol steam inlet containing ammonia, alkali liquor inlet, steam (vapor) outlet containing ammonia and
Lye export containing phenol, described is connected containing phenol steam (vapor) outlet containing ammonia with described containing phenol steam inlet containing ammonia；
Described acidification unit is provided with sour entrance, alkali liquor inlet containing phenol and acidifying solution outlet, described alkali liquor inlet containing phenol
It is connected with described lye export containing phenol；
Described phenol extraction cells are provided with acidifying solution entrance, extractant entrance, extract outlet and abstraction waste liquor outlet, institute
State acidifying solution entrance to be connected with the outlet of described acidifying solution；
Described biochemical treatment unit is provided with dephenolize deamination sewage inlet, abstraction waste liquor entrance and outlet, and described dephenolize takes off
Ammonia sewage inlet is connected with described dephenolize deamination outlet of sewer, and described abstraction waste liquor entrance is connected with the outlet of described abstraction waste liquor.
In one embodiment of the invention, described dephenolize deamination unit is provided with phenol extract process chamber, described benzene
Phenol extraction liquid process chamber is provided with extract entrance, steam (vapor) outlet containing phenol and waste liquid outlet, and described phenol extraction cells are additionally provided with useless
Liquid entrance, described extract entrance is connected with the outlet of described extract, and described waste liquid outlet is connected with described waste liquid entrance.
In one embodiment of the invention, described acidification unit is additionally provided with backflow water inlet, described recirculation water
Entrance is connected with the outlet of described abstraction waste liquor.
In one embodiment of the invention, described dephenolize deamination unit includes stripper, and described stripper has multilamellar,
The temperature and pressure of described stripper top layer is less than the temperature and pressure of described stripper bottom.
In one embodiment of the invention, the inlet pipeline of described stripper top layer is circular spiral structure.
In one embodiment of the invention, the bottom of described stripper is provided with steam heater.
In one embodiment of the invention, described ammonia nitrogen recovery unit is furnished with acid-base value analyzer.
According to another aspect of the present invention, present invention also offers a kind of process low order pyrolysis of coal dirt using said system
The method of water, methods described comprises the steps:
Sewage will be pyrolyzed, pyrolysis coke sends into described oil removing unit, oil removing will be carried out to described pyrolysis sewage；
Sewage after oil removing is sent into described precipitation unit, and adds flocculant, except the float in decontaminated water；
The sewage removing float is sent into described dephenolize deamination unit, phenol and ammonia nitrogen are separated with steam from sewage
Out；
The steam discharged from described dephenolize deamination unit containing phenol and ammonia nitrogen is sent into described ammonia nitrogen recovery unit, and plus
Enter alkali liquor, be passed through initial steam, reclaim ammonia nitrogen；
Send discharging the alkali liquor containing phenol from described ammonia nitrogen recovery unit into described acidification unit, and add
Acid, adjusts ph；
The acidifying solution mixing up ph is sent into described phenol extraction cells, and adds extractant, prepared extract, by extract
Process further and phenol is obtained；
Sewage and the abstraction waste liquor described biochemistry of feeding from the discharge of described phenol extraction cells of phenol and ammonia nitrogen will be removed
Processing unit carries out biochemical treatment, is then discharged out.
In one embodiment of the invention, described abstraction waste liquor is partly refluxed to described acidification unit.
In one embodiment of the invention, the ph of the alkali liquor containing phenol discharged from described ammonia nitrogen recovery unit≤
10.
The system and method for the process low order pyrolysis of coal sewage that the present invention provides combines low order pyrolytic process of coal feature, enters
Gone scientific and reasonable Process Route Planning it is achieved that to low order pyrolytic process of coal produce sewage carry out efficient, targeted
Process, and the available resources in sewage is reclaimed.
Secondly, the system and method for the process low order pyrolysis of coal sewage that the present invention provides achieves pyrolysis coke using sewage
Quenching, also primary adsorption treatment has been carried out to sewage simultaneously.
Additionally, the system and method for the process low order pyrolysis of coal sewage of present invention offer rationally utilizes giving up in production process
Alkali liquor and acid pickle, decrease soda acid usage amount, reduce operation processing cost.
Further, the stripper used by the present invention is vertical double-chamber structure, carries out denitrogenation dephenolize and extract with phenol simultaneously,
Decrease the quantity of stripper, reduce process costs.
Further, the system and method for the process low order pyrolysis of coal sewage that the present invention provides is extracted the phenol in sewage
With ammonia nitrogen it is achieved that the resource of garbage.
Brief description
Fig. 1 is the structural representation of the system that one of embodiment of the present invention processes low order pyrolysis of coal sewage.
Fig. 2 is the process chart that one of embodiment of the present invention processes low order pyrolysis of coal sewage.
In figure:
1st, grease removal tank；1-1, pyrolysis sewage inlet；1-2, pyrolysis coke entrance；1-3, coke export；
2nd, sedimentation tank；2-1, precipitate outlet；
3rd, stripper；3-1, steam inlet；
4th, alkali liquor absorption tank；4-1, steam inlet；4-2, alkali liquor inlet；
5th, acidification device；5-1, sour entrance；
6th, phenol extraction tower；6-1, extractant entrance；
7th, regulating reservoir；
8th, sbr biochemical treatment tank；8-1, outlet；
9th, chemicals feeder；
10th, phenol storage tank；
11st, tank used for storing ammonia.
Specific embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in more details, so that energy
The advantage enough more fully understanding the solution of the present invention and its various aspects.However, specific embodiments described below and enforcement
Example is only descriptive purpose, rather than limitation of the present invention.
The invention discloses a kind of system processing low order pyrolysis of coal sewage.Comprising: it is oil removing unit, precipitation unit, de-
Phenol deamination unit, ammonia nitrogen recovery unit, acidification unit, phenol extraction cells and biochemical treatment unit.
Oil removing unit is provided with pyrolysis sewage inlet, pyrolysis coke entrance and oil removing outlet of sewer.
Oil removing unit is used for oil slick and some organic pollutants in absorption pyrolysis sewage, and sewage is heated.
Additionally, oil removing unit can also cool down to pyrolysis coke quenching, and wash away the part lime-ash in pyrolysis coke.Oil removing unit is best
Closed, prevent secondary pollution.Sewage after oil removing cell processing enters precipitation unit.
The concrete equipment of oil removing unit does not need to be particularly limited to, as long as corresponding function can be had.Preferably, oil removing
Unit includes grease removal tank, and grease removal tank top seals.
Precipitation unit is provided with oil removing sewage inlet, flocculant entrance and precipitation outlet of sewer, oil removing sewage inlet and oil removing
Outlet of sewer is connected.
Precipitation unit passes through flocculent precipitation and gravitational settling method removes the insoluble matter in decontaminated water.After precipitation unit is processed
Sewage enters dephenolize deamination unit.
The concrete equipment of precipitation unit does not need to be particularly limited to, as long as corresponding function can be had.Preferably, precipitate
Unit includes sedimentation tank.For the more easily dosing toward in sedimentation tank, can configure a chemicals feeder.
Dephenolize deamination unit is provided with precipitation sewage inlet, steam inlet, dephenolize deamination outlet of sewer and the steam containing ammonia containing phenol
Outlet, precipitation sewage inlet is connected with precipitation outlet of sewer.
Dephenolize deamination unit, by way of steam stripping, phenol, ammonia nitrogen is separated from sewage, and with steam row
Go out, and improve the biodegradability of sewage.Sewage after dephenolize deamination cell processing enters biochemical treatment unit, containing phenol, ammonia
The steam of nitrogen enters ammonia nitrogen recovery unit.
Dephenolize deamination unit includes stripper, and stripper does not need particularly to limit, as long as corresponding function can be had.
Stripper is to be passed through detached for the volatile component in liquid device during liquid using high-temperature gas, in the present invention, preferably
Multilamellar.The temperature and pressure of its top layer needs the temperature and pressure less than described stripper bottom, because steam is from bottom liter
To top, in order to realize the displacement of steam, top layer pressure is low.The inlet pipeline of precipitation sewage is preferably circular spiral knot
Structure, is conducive to waste heat to exchange.In order to improve Srteam Stripping effect, the bottom of stripper preferably arranges one or more steam heating again
Device, heats to the steam entering tower.
Ammonia nitrogen recovery unit is provided with steam inlet, contains phenol steam inlet containing ammonia, alkali liquor inlet, steam (vapor) outlet containing ammonia and contain phenol
Lye export, is connected with containing phenol steam (vapor) outlet containing ammonia containing phenol steam inlet containing ammonia.
Ammonia nitrogen recovery unit is used for reclaiming the ammonia nitrogen in sewage.There is alkali liquor, the steaming containing phenol, ammonia nitrogen in ammonia nitrogen recovery system
After vapour enters ammonia nitrogen recovery unit, by alkali liquor absorption, ammonia separating treatment again under the effect of steam stripping, discharge ammonia with steam
Nitrogen recovery unit, condensed rear formation low concentration ammonia.Remaining alkali liquor enters acidification unit.
The concrete equipment of ammonia nitrogen recovery unit does not need to be particularly limited to, as long as corresponding function can be had.Preferably,
Ammonia nitrogen recovery unit includes alkali liquor absorption tank.
When ph is less than 11, deamination effect on driving birds is not good.Therefore, on-line monitoring for convenience, ammonia nitrogen recovery unit can configure soda acid
Degree analyzer.
Acidification unit is provided with sour entrance, alkali liquor inlet containing phenol and acidifying solution outlet, and alkali liquor inlet containing phenol and ammonia nitrogen return
The lye export containing phenol receiving unit is connected.
Acidification unit is used for for the sodium phenate in alkali liquor containing phenol being converted into phenol.The acidifying that acidification unit is discharged
Liquid enters phenol extraction cells.
The concrete equipment of acidification unit does not need to be particularly limited to, as long as corresponding function can be had.Preferably,
Acidification unit includes acidification device.
Phenol extraction cells are provided with acidifying solution entrance, extractant entrance, extract outlet and abstraction waste liquor outlet, acidifying solution
Entrance is connected with the acidifying solution outlet of acidification unit.
Phenol extraction cells carry out counter-current extraction by organic extractant and phenol-containing wastewater, by the phenol in sewage from aqueous phase
It is transferred in organic faciess.
Phenol just can be obtained after the extract that phenol extraction cells are discharged also needs to process further.Steam stripping can be adopted
Mode phenol is extracted from extract, can dephenolize deamination unit arrange phenol extract process chamber, phenol extract
Liquid process chamber need to be provided with extract entrance, steam (vapor) outlet containing phenol and waste liquid outlet, the extraction of extract entrance and phenol extraction cells
Liquid outlet is taken to be connected.Waste liquid can be recycled to phenol extraction cells and be re-used for phenol extraction, and now, phenol extraction cells also need to set
There is waste liquid entrance, waste liquid entrance is connected with the waste liquid outlet of phenol extract process chamber.
The abstraction waste liquor that phenol extraction cells are discharged is containing sour sewage, reflowable to acidification unit, reduce at acidifying
The concentration of sewage in reason unit.Now, acidification unit need to be provided with backflow water inlet, backflow water inlet and phenol extraction cells
Abstraction waste liquor outlet be connected.Another part abstraction waste liquor enters biochemical treatment unit.
The concrete equipment of phenol extraction cells does not need to be particularly limited to, as long as corresponding function can be had.Preferably,
Phenol extraction cells include phenol extraction tower.
Biochemical treatment unit is provided with dephenolize deamination sewage inlet, abstraction waste liquor entrance and outlet, and dephenolize deamination sewage enters
Mouth is connected with the dephenolize deamination outlet of sewer of dephenolize deamination unit, and abstraction waste liquor entrance is gone out with the abstraction waste liquor of phenol extraction cells
Mouth is connected.
Biochemical treatment unit is used for processing further sewage, makes the water discharged after biochemical treatment reach industrial cycle and uses
The water standard of water.
The concrete equipment of biochemical treatment unit does not need to be particularly limited to, as long as corresponding function can be had.Preferably,
Biochemical treatment unit includes sbr biochemical treatment tank and regulating reservoir.
Sbr is the abbreviation of batch-type batch activated sludge method (sequencing batch reactor).It is in recent years
At home and abroad it is caused a kind of extensive biochemical wastewater treatment new technique paid attention to popularization increasingly.Sbr technique is by by certain time
The reactor composition that sequential batch operation runs, the operating process when processing sewage for each batch reactor includes by intaking
The cycle of operation that phase, reaction phase, precipitation phase, draining spoil disposal phase and lay-up period are constituted.In a cycle of operation, each stage
In run time, reactor the change of mixeding liquid volume and running status all can according to the property of concrete sewage, effluent quality and
Operation function requirement etc. is flexibly grasped.Its main feature has: occupation of land is little, effluent quality is good, anti impulsion load can high and operation pipe
Reason is simple.
Present invention also offers a kind of method that utilization said system processes low order pyrolysis of coal sewage.The method includes as follows
Step:
Sewage will be pyrolyzed, pyrolysis coke sends into described oil removing unit, oil removing will be carried out to described pyrolysis sewage；
Sewage after oil removing is sent into described precipitation unit, and adds flocculant, except the float in decontaminated water；
The sewage removing float is sent into described dephenolize deamination unit, phenol and ammonia nitrogen are separated with steam from sewage
Out；
The steam discharged from described dephenolize deamination unit containing phenol and ammonia nitrogen is sent into described ammonia nitrogen recovery unit, and plus
Enter alkali liquor, be passed through initial steam, reclaim ammonia nitrogen；
Send discharging the alkali liquor containing phenol from described ammonia nitrogen recovery unit into described acidification unit, and add
Acid, adjusts ph；
The acidifying solution mixing up ph is sent into described phenol extraction cells, and adds extractant, prepared extract, by extract
Process further and phenol is obtained；
Sewage and the abstraction waste liquor described biochemistry of feeding from the discharge of described phenol extraction cells of phenol and ammonia nitrogen will be removed
Processing unit carries out biochemical treatment, is then discharged out.
Wherein, abstraction waste liquor is partly refluxed to described acidification unit.
Additionally, ph≤10 of the alkali liquor containing phenol discharged from ammonia nitrogen recovery unit.
Below with reference to specific embodiment, the present invention will be described.In following embodiments, institute's taking technique condition value is
Exemplary, its desirable numerical range is as shown in foregoing summary.Detection method used by following embodiments is one's own profession
The conventional detection method of industry.
Embodiment 1
The present embodiment provides a kind of system of low order pyrolysis of coal sewage, and its structural representation is as shown in Figure 1.Specifically include:
At grease removal tank 1, sedimentation tank 2, stripper 3, alkali liquor absorption tank 4, acidification device 5, phenol extraction tower 6, regulating reservoir 7, sbr biochemistry
Reason pond 8, chemicals feeder 9, phenol storage tank 10 and tank used for storing ammonia 11.
Grease removal tank 1 top seals, and grease removal tank 1 is provided with pyrolysis sewage inlet 1-1, pyrolysis coke entrance 1-2, coke go out
Mouth 1-3 and oil removing outlet of sewer.
Sedimentation tank 2 is provided with oil removing sewage inlet, flocculant entrance, precipitate outlet 2-1 and precipitation outlet of sewer.Sedimentation tank
2 are furnished with chemicals feeder 9, and chemicals feeder 9 is connected with flocculant entrance.Oil removing sewage inlet is connected with the oil removing outlet of sewer of grease removal tank 1.
3 points of upper, middle and lower three-deckers of stripper, are longitudinally divided into two cell structures, and a Room is sewage disposal room, and a Room is phenol
Extract process chamber, the structure of two Room is similar.Stripper 3 is internal to be environment under high pressure, and the temperature and pressure of its top layer is less than bottom
Temperature and pressure.The attached insulation material of tower wall is it is ensured that temperature stabilization in tower.The middle level of stripper 3 sets packing layer, and packing layer is provided with
Through even in liquid phase distributor, bottom is provided with steam inlet 3-1.
Sewage disposal room upper strata is provided with precipitation sewage inlet, the steam (vapor) outlet containing ammonia containing phenol, and bottom is provided with dephenolize deamination sewage
Outlet and steam heater.Precipitation sewage inlet is connected with the precipitation outlet of sewer of sedimentation tank 2.Additionally, water treatment room upper strata
Inlet pipeline is circular spiral structure, and steam, when inlet pipeline flows through, can carry out being preheated to more than 85 DEG C to the sewage entering.
The steam heater of lower floor heats to entering tower steam, improves the temperature of steam, is conducive to Srteam Stripping effect.
Phenol extract process chamber upper strata is provided with steam (vapor) outlet containing phenol, extract entrance, and bottom is provided with waste liquid outlet.Phenol
Storage tank 10 is connected with steam (vapor) outlet containing phenol.
Alkali liquor absorption tank 4 top is provided with steam (vapor) outlet containing ammonia, and side is provided with steam inlet 4-1, and bottom is provided with alkali liquor containing phenol
Outlet, alkali liquor absorption tank 4 is additionally provided with containing phenol steam inlet containing ammonia, alkali liquor inlet 4-2.Containing phenol steam inlet containing ammonia and stripper 3
Containing phenol steam (vapor) outlet containing ammonia be connected.Alkali liquor absorption tank 4 is furnished with ph analyzer, for the ph value of on-line monitoring alkali liquor.Ammonia stores up
Tank 11 is connected with steam (vapor) outlet containing ammonia.
Acidification device 5 is provided with sour entrance 5-1, alkali liquor inlet containing phenol, backflow water inlet and acidifying solution outlet, alkali liquor containing phenol
Entrance is connected with the lye export containing phenol of alkali liquor absorption tank 4.
The tower top of phenol extraction tower 6 is provided with acidifying solution entrance and extract outlet, and side wall is provided with extractant entrance 6-1, benzene
Phenol extraction tower 6 is additionally provided with waste liquid entrance, abstraction waste liquor outlet.Acidifying solution entrance is connected with the acidifying solution outlet of acidification device 5,
Waste liquid entrance is connected with the waste liquid outlet of stripper 3, and extract outlet is connected with the extract entrance of stripper 3, abstraction waste liquor
Outlet is connected with the backflow water inlet of acidification device 5.
Regulating reservoir 7 is provided with dephenolize deamination sewage inlet, abstraction waste liquor entrance and adjusts water out, dephenolize deamination sewage inlet
It is connected with the dephenolize deamination outlet of sewer of stripper 3, abstraction waste liquor entrance also exports phase with the abstraction waste liquor of phenol extraction tower 6
Even.
Sbr biochemical treatment tank 8 is provided with water inlet and outlet, and water inlet is connected with the regulation water out of regulating reservoir 7.
Embodiment 2
The method of the system low order pyrolysis of coal sewage that a kind of utilization embodiment 1 of the present embodiment offer is provided.Concrete technology
Flow process is as shown in Figure 2.
The water quality of the low order pyrolysis of coal sewage that the present embodiment adopts is as follows:
Cod=8000mg/l, bod5=4100mg/l, ammonia nitrogen=1800mg/l, volatile phenol=5600mg/l, ph=10.
The pyrolysis sewage that pyrolysis system produces and pyrolysis coke are delivered to grease removal tank 1.Pyrolysis sewage cools down to pyrolysis coke
Cooling, reaches quenching purpose.Meanwhile, pyrolysis coke heats up to pyrolysis sewage during quenching and heats, and pyrolysis sewage water temperature can
Rise to 65 DEG C.Pyrolysis coke also has adsorption, can adsorb the oily substance in pyrolysis sewage, is conducive to follow-up dephenolize to take off
Ammonia and the normal operation of biochemical treatment.
Enter sedimentation tank 2 from the sewage that grease removal tank 1 is discharged.Chemicals feeder 9 adds flocculating settling agent toward in sedimentation tank 2, will
Suspended substance sedimentation in sewage at the bottom of pond, by deslagging by precipitate discharge system.
Enter stripper 3 from the sewage that sedimentation tank 2 is discharged.In the present embodiment, the pressure of stripper 3 top layer is
0.3mpa, the pressure of bottom is 0.6mpa.From sedimentation tank 2 precipitation outlet of sewer discharge sewage at the sewage of stripper 3
The precipitation sewage inlet on the upper strata of reason room enters in tower, by water inlet pipe to packing layer, fills after the distribution of even in liquid phase distributor
Full packing layer.Steam is out-of-date from the inlet pipeline intermediate flow of circular spiral structure, and the sewage entering tower is preheated to about 85 DEG C.Bottom
Steam heater the temperature entering the live steam of tower is promoted to 150 DEG C.Abundant with sewage after bottom steam entrance packing layer
Contact, by the phenol in sewage, ammonia nitrogen separating treatment, and sets out with steam, by exporting stripper containing phenol steam (vapor) outlet containing ammonia
2, enter alkali liquor absorption tank 4.
The sewage discharged from stripper 2 enters regulating reservoir 7, then enters back in sbr biochemical treatment tank 8 and processes further,
After reaching industrial cycle water water standard, reuse is as the recirculated cooling water of low order pyrolytic process of coal.
In the present embodiment, the alkali liquor used by alkali liquor absorption tank 4 is naoh solution.Contain ammonia steaming from what stripper 2 was discharged containing phenol
Vapour generates sodium phenate, ammonia, ammonium hydroxide etc. with naoh solution reaction.It is passed through fresh steam toward in alkali liquor absorption tank 4, new
Fresh steam continues under stripping, and the ammonia nitrogen absorbing in alkali liquor is separated once more, sets out with steam, condensed rear formation ammonia, storage
It is stored in tank used for storing ammonia 11.When the ph of alkali liquor is less than 11, alkali liquor is discharged.
Enter ph after acid adding acidification device 5 from the alkali liquor that alkali liquor absorption tank 4 is discharged to adjust to 6.After acidification, water
Sodium phenate in body becomes phenol.
Send into phenol extraction tower 6 from the acidification wastewater that acidification device 5 is discharged.Add acetic acid toward in phenol extraction tower 6
Butyl ester, butyl acetate and acidification wastewater carry out counter-current extraction, and gained contains sour foul water fraction and is back in acidification device 5, another
Part then flow to regulating reservoir 7, then enters back in sbr biochemical treatment tank 8 and processes further.
Send into the phenol extract process chamber of stripper 3 from the phenol extract that phenol extraction tower 6 is discharged, equal through liquid phase
Even distributor is full of packing layer, and bottom steam is fully contacted with phenol extract, by the phenol in extract after entering packing layer
Separate, and set out with steam, stripper 3 is exported by steam (vapor) outlet containing phenol, enter phenol storage tank 10；Waste liquid passes through waste liquid outlet
Return in phenol extraction tower 6.
In summary, the system and method for the process low order pyrolysis of coal sewage that the present invention provides combines low order pyrolysis of coal work
Skill feature, carried out scientific and reasonable Process Route Planning it is achieved that to low order pyrolytic process of coal produce sewage carry out efficiently,
Targetedly process, and the available resources in sewage is reclaimed.
Secondly, the system and method for the process low order pyrolysis of coal sewage that the present invention provides achieves pyrolysis coke using sewage
Quenching, also primary adsorption treatment has been carried out to sewage simultaneously.
Additionally, the system and method for the process low order pyrolysis of coal sewage of present invention offer rationally utilizes giving up in production process
Alkali liquor and acid pickle, decrease soda acid usage amount, reduce operation processing cost.
Further, the stripper used by the present invention is vertical double-chamber structure, carries out denitrogenation dephenolize and extract with phenol simultaneously,
Decrease the quantity of stripper, reduce process costs.
Further, the system and method for the process low order pyrolysis of coal sewage that the present invention provides is extracted the phenol in sewage
With ammonia nitrogen it is achieved that the resource of garbage.
It should be noted that each embodiment above by reference to described by accompanying drawing only limits this in order to illustrate rather than
The scope of invention, it will be understood by those within the art that, right under the premise without departing from the spirit and scope of the present invention
Modification or equivalent that the present invention is carried out, all should cover within the scope of the present invention.Additionally, unless stated otherwise, that
All or part of of any embodiment can use in conjunction with all or part of of any other embodiment.
Claims (10)
1. a kind of process low order pyrolysis of coal sewage system it is characterised in that it include oil removing unit, precipitation unit, dephenolize take off
Ammonia unit, ammonia nitrogen recovery unit, acidification unit, phenol extraction cells and biochemical treatment unit；
Described oil removing unit is provided with pyrolysis sewage inlet, pyrolysis coke entrance and oil removing outlet of sewer；
Described precipitation unit be provided with oil removing sewage inlet, flocculant entrance and precipitation outlet of sewer, described oil removing sewage inlet with
Described oil removing outlet of sewer is connected；
Described dephenolize deamination unit is provided with precipitation sewage inlet, dephenolize deamination outlet of sewer and the steam (vapor) outlet containing ammonia containing phenol, described
Precipitation sewage inlet is connected with described precipitation outlet of sewer；
Described ammonia nitrogen recovery unit is provided with steam inlet, contains phenol steam inlet containing ammonia, alkali liquor inlet, steam (vapor) outlet containing ammonia and contain phenol
Lye export, described is connected containing phenol steam (vapor) outlet containing ammonia with described containing phenol steam inlet containing ammonia；
Described acidification unit is provided with sour entrance, alkali liquor inlet containing phenol and acidifying solution outlet, described alkali liquor inlet containing phenol and institute
State lye export containing phenol to be connected；
Described phenol extraction cells are provided with acidifying solution entrance, extractant entrance, extract outlet and abstraction waste liquor outlet, described acid
Change liquid entrance to be connected with the outlet of described acidifying solution；
Described biochemical treatment unit is provided with dephenolize deamination sewage inlet, abstraction waste liquor entrance and outlet, and described dephenolize deamination is dirty
Water inlet is connected with described dephenolize deamination outlet of sewer, and described abstraction waste liquor entrance is connected with the outlet of described abstraction waste liquor.
2. system according to claim 1 is it is characterised in that described dephenolize deamination unit is provided with the process of phenol extract
Room, described phenol extract process chamber is provided with extract entrance, steam (vapor) outlet containing phenol and waste liquid outlet, described phenol extraction cells
It is additionally provided with waste liquid entrance, described extract entrance is connected with the outlet of described extract, described waste liquid outlet and described waste liquid entrance
It is connected.
3. system according to claim 1 is it is characterised in that described acidification unit is additionally provided with backflow water inlet, institute
State backflow water inlet to be connected with the outlet of described abstraction waste liquor.
4. system according to claim 1 is it is characterised in that described dephenolize deamination unit includes stripper, described stripping
Tower has multilamellar, and the temperature and pressure of described stripper top layer is less than the temperature and pressure of described stripper bottom.
5. system according to claim 4 is it is characterised in that the inlet pipeline of described stripper top layer is tied for circular spiral
Structure.
6. system according to claim 4 is it is characterised in that the bottom of described stripper is provided with steam heater.
7. system according to claim 1 is it is characterised in that described ammonia nitrogen recovery unit is furnished with acid-base value analyzer.
8. in a kind of utilization claim 1-7, arbitrary described system processes the method for low order pyrolysis of coal sewage it is characterised in that institute
The method of stating comprises the steps:
Sewage will be pyrolyzed, pyrolysis coke sends into described oil removing unit, oil removing will be carried out to described pyrolysis sewage；
Sewage after oil removing is sent into described precipitation unit, and adds flocculant, except the float in decontaminated water；
The sewage removing float is sent into described dephenolize deamination unit, phenol and ammonia nitrogen are isolated with steam from sewage
Come；
The steam discharged from described dephenolize deamination unit containing phenol and ammonia nitrogen is sent into described ammonia nitrogen recovery unit, and adds alkali
Liquid, it is passed through initial steam, reclaim ammonia nitrogen；
Send discharging the alkali liquor containing phenol from described ammonia nitrogen recovery unit into described acidification unit, and add acid, adjust
Section ph；
The acidifying solution mixing up ph is sent into described phenol extraction cells, and adds extractant, prepared extract, extract is entered one
Step processes and phenol is obtained；
Sewage and the abstraction waste liquor described biochemical treatment of feeding from the discharge of described phenol extraction cells of phenol and ammonia nitrogen will be removed
Unit carries out biochemical treatment, is then discharged out.
9. method according to claim 8 is it is characterised in that be partly refluxed to described acidification by described abstraction waste liquor
Unit.
10. method according to claim 8 it is characterised in that from described ammonia nitrogen recovery unit discharge containing phenol
Ph≤10 of alkali liquor.
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| CN201610841923.9A CN106336077A (en) | 2016-09-22 | 2016-09-22 | System and method for treating low-rank coal pyrolysis sewage |
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| CN201610841923.9A CN106336077A (en) | 2016-09-22 | 2016-09-22 | System and method for treating low-rank coal pyrolysis sewage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023108859A1 (en) * | 2021-12-17 | 2023-06-22 | 北京工业大学 | Pyrolysis recycling method for organic component in waste light-emitting diode |
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2016
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023108859A1 (en) * | 2021-12-17 | 2023-06-22 | 北京工业大学 | Pyrolysis recycling method for organic component in waste light-emitting diode |
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