CN107684812A - Oxidizing process in low-pressure oxidized slurries system and liquid - Google Patents
Oxidizing process in low-pressure oxidized slurries system and liquid Download PDFInfo
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- CN107684812A CN107684812A CN201710844955.9A CN201710844955A CN107684812A CN 107684812 A CN107684812 A CN 107684812A CN 201710844955 A CN201710844955 A CN 201710844955A CN 107684812 A CN107684812 A CN 107684812A
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- slurries
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- 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
- B01D53/73—After-treatment of removed components
Abstract
The present invention discloses oxidizing process on a kind of low-pressure oxidized slurries system and liquid, and it is mainly used in fire coal boiler fume cleaning project.Low-pressure oxidized slurries system includes serum recycle system, oxidation air feed system and slurries oxidation unit；The pipeline of conveying oxidation air does not enter in the slurry tank slurries in purifying column, and it is directly entered in slurries oxidation unit, slurries are met with oxidation air in the form of spraying, then it is sucked and flows into air and liquid mixer, the slurries after oxidation is passed back into purifying column in slurry tank with remaining oxidation air.The method that slurries are aoxidized on the liquid of the present invention considerably reduces the resistance of slurries oxidative system, and the power consumption of oxidation fan is greatly lowered, the efficient mass transfer field formed preferably by spiral-flow type gas-liquid mixer, reaches the effect that high efficiency aoxidizes slurries.Oxidation fan is done with centrifugal fan, simple system, considerably reduces engineering cost, system operation is reliable, is easy to operational management.
Description
Technical field
The invention belongs to environmental protection technical field, more particularly to a kind of technological system of low-pressure oxidized slurries.
Background technology
Slurries oxidative system is a system critically important in gas cleaning engineering, and its effect is to generate desulfurization in slurries
Sulfite oxidation into sulfate, it is concentrated after discharge system as byproduct recovery.It is domestic for the oxidation technology of slurries
Outer accepted practice is to be delivered to after with high-pressure oxidation blower fan, air is boosted with pipeline in the oxidation air pipe network of slurries trench bottom,
Sprayed into by nozzle in slurries, slurries are aoxidized.It is this to be passed through what oxidation air was aoxidized to slurries in slurries trench bottom
Method we be referred to as oxidizing process under liquid.Because the oxidation air pipe net arrangement of oxidizing process under liquid is in the bottom of slurry tank, therefore oxygen
The resistance of change air system is very big, and in order to overcome the resistance of system, oxidation air must have higher pressure, so can only select
Oxidation fan is done with high pressure roots blower or air compressor, the consequence brought is that amount of equipment power consumption is big, high noise, need to be set up
Oxidation fan factory building, investment is high, system complex, adds operational management workload.In order to change this situation, by for many years
Development test and update, propose the present invention finally.
The content of the invention
In view of this, there is provided oxidizing process in a kind of low-pressure oxidized slurries system and liquid, it considerably reduces slurries oxidation
The resistance of system, the power consumption of oxidation fan is greatly lowered, reach high efficiency oxidation slurries effect, the simple system, greatly
Amplitude reduction engineering cost, system operation is reliable, be easy to operational management.
On the one hand technical scheme provides oxidizing process on a kind of liquid, it is characterised in that the oxidizing process of slurries exists
Carried out in slurries oxidation unit more than slurry tank liquid level：The slurry containing sulphite is conveyed into slurries oxidation unit
Liquid and oxidation air, the sulphite in slurries are oxidized to sulfate, and the slurries after then aoxidizing flow into purifying column again.
Further, the pipeline for conveying oxidation air does not enter in the slurry tank slurries in purifying column, and is directly entered institute
State in slurries oxidation unit.
Further, the slurries containing sulphite in the form of spraying with oxidation air in slurries oxidation unit phase
Meet, subsequently into gas-liquid mixing device.
Further, the slurries oxidation unit is provided with spiral-flow type gas-liquid mixer, the slurries containing sulphite with
Oxidation air meets before spiral-flow type gas-liquid mixer, is then sucked and flows into spiral-flow type gas-liquid mixing device, slurries
Main oxidation process carried out in gas-liquid mixer；
The efficient mass transfer field that the spiral-flow type gas-liquid mixer is formed is mixed for the slurries with oxidation air.
The another aspect of technical scheme provides a kind of low-pressure oxidized slurries system, and it includes serum recycle system
System, oxidation air feed system and slurries oxidation unit；
The pipeline of the conveying oxidation air of oxidation air feed system does not enter in the slurry tank slurries in purifying column, and straight
Tap into the slurries oxidation unit；
Slurries equipped with sulphite are delivered into slurries oxygen by serum recycle system, including first device, first device
In makeup is put；
Oxidation air feedway, including second device, second device convey oxidation into described slurries oxidation unit
Air；
Slurries oxidation unit, including 3rd device, the slurries mix oxygen with described oxidation air in 3rd device
Change, then flow into purifying column；
Further, the slurries oxidation unit is arranged in outside purifying column and more than slurry tank liquid level.
Further, the 3rd device include spray system, gas-liquid mixing device, gas-liquid mixing device be centrifugal gas-
Liquid mixer, slurries are sprayed by spray system, and slurries are taken out after being met with the oxidation air sent by oxidation air feed system
Inhale and flow into gas-liquid mixing device, in slurry tank of the slurry reflux after gas-liquid mixing device internal oxidition to purifying column.
Further, the first device includes slurries pump 5, slurries pipeline 6；The 3rd device includes spray system；
The slurries that slurry tank includes sulphite are sucked by slurries pump 5, are sent out through slurries pipeline 6, are sprayed by spray system, and by aoxidizing
The oxidation air that air supply system is sent meets and while entered in slurries oxidation unit, the slurries after oxidation and remaining oxygen
Change air and export discharge from slurries oxidation unit, flow into purifying column.
Further, the gas-liquid mixing device is spiral-flow type gas-liquid mixing device.
Further, the second device includes oxidation fan 1, oxidation air pipeline 2；The oxidation fan is centrifugal
Ventilation blower, oxidation air is sent into spiral-flow type gas-liquid mixer and slurries is aoxidized by the oxidation air pipeline 2, remaining
Oxidation air enters in purifying column through mixed flow tube, is back in the slurry tank of purifying column, remaining oxidation air is with purifying column
Gas cleaning flow is discharged into air through chimney.
The present invention preferable technical scheme innovation and beneficial effect essentially consist in it is following some：
1st, a kind of technological system of low-pressure oxidized slurries has been founded
Oxidation fan is done with centrifugal fan the invention provides one kind, is formed with spiral-flow type gas-liquid mixer
Efficient mass transfer field is that slurries and oxidation air create and mix contact conditions well, and the sulphite in slurries is oxidized to sulphur
The technological system of the low-pressure oxidized slurries of hydrochlorate.The system by serum recycle system (pump containing slurries, slurries pipeline, nozzle etc.),
Oxidation air feed system (containing oxidation fan, oxidation air pipeline etc.) and slurries oxidation unit (gas containing spiral-flow type-liquid mixing
Device, mixed flow tube etc.) three parts composition.
After oxidation air and the slurries sprayed by nozzle enter spiral-flow type gas-liquid mixer simultaneously, in efficient mass transfer field
Sulphite in slurries is oxidized to sulfate, and the slurries after oxidation are flowed into purifying column together with remaining oxidation air.
2nd, the oxidation of slurries is carried out in spiral-flow type gas-liquid mixer, the height formed using spiral-flow type gas-liquid mixer
Effect mass transfer field enables slurries and oxidation air fully to contact and mix, and reaches the purpose of efficient oxidation slurries, is carried for slurries oxidation
A full technical strategies are supplied.
3rd, oxidizing process is a kind of method of brand-new oxidation slurries on liquid.Slurries in slurry tank are delivered to by slurries pumped
In spiral-flow type gas-liquid mixer, during being contacted with oxidation air mixing, the sulphite in slurries is by efficient oxidation
Into sulfate.We are referred to as oxygen on liquid using the gas-liquid mixer being located at outside slurry tank by this to aoxidize the method for slurries
Change method.
4th, make oxidation fan with centrifugal fan, reached the purpose of low-pressure oxidized slurries, due to oxidizing process on liquid
Liquid level of slurry is not influenceed the resistance of oxidation air feed system in by slurry tank, therefore the resistance of oxidation air feed system is very
Low, the pressure provided with centrifugal fan can meet the requirement for aoxidizing slurries completely, it is not necessary that be roused from high pressure roots
Blower fan or air compressor do oxidation fan.
Compared with prior art the beneficial effects of the present invention are：
1st, the resistance of oxidation air feed system of the invention is low, can do oxidation fan with centrifugal fan.
It is made up of for the resistance of oxidizing process under liquid (prior art) oxidation air feed system following items：P=P1+P2
+P3+P4。
In formula：P-oxidation air feed system drag overall；
P1-oxidation air the resistance of ducting；
Liquid level in P2-slurry tank, m；
Flue gas resistance in P3-purifying column；
P4-neat stress the resistance of ducting.
And the resistance of oxidizing process (present invention) oxidation air feed system is made up of following items on liquid：P=P1+P3+P4.
Liquid level is not influenceed the resistance of oxidizing process oxidation air feed system in by slurry tank on liquid as can be seen here.
Judge now to be compared with specific drag parameter for the ease of analysis：
If oxidation air pipeline drag overall P1=500Pa, liquid level H=7m, resistance P2=68670Pa in slurry tank,
The resistance P3=1500Pa of flue gas in purifying column, neat stress resistance of ducting P4=500Pa.
Then the drag overall of oxidizing process (prior art) oxidation air feed system is P=71170Pa under liquid, and is aoxidized on liquid
The drag overall that method (present invention) oxidation air is supplied to system is P=2500Pa, just corresponds to oxidizing process resistance under liquid
3.5%, when liquid level increase in slurry tank, the ratio is also further reduced.Therefore for the present invention, from centrifugal logical
Blower fan is entirely capable of the requirement for meeting oxidation slurries, and for aoxidizing slurry method under liquid, high pressure roots blower can only be selected
Or air compressor does oxidation fan.
2nd, the present invention considerably reduces the power consumption of oxidation fan, reduces running cost.
The power of oxidation fan motor is typically calculated as follows：
Nm=(K1 × P × Q)/η × K2 × 10-3Kw
In formula：Nm-oxidation fan adapted motor power (output)；
P-oxidation air feed system drag overall；
Q-oxidation air amount；
The efficiency of η-oxidation fan；
The safety coefficient of K1-SR；
The safety coefficient of K2-motor.
For in oxidizing process (prior art) above-mentioned formula under oxidizing process on liquid (present invention) and liquid, except system drag overall
P is different outer, and other specification is all identical, it can be seen that the power consumption of oxidizing process oxidation fan just corresponds to oxidizing process oxygen under liquid on liquid
3.5% or so of wind transmission machine power consumption, energy-saving effect is notable, effectively reduces the running cost of system.
3rd, the present invention does oxidation fan with centrifugal fan, and not only equipment manufacturing cost is low, and need not build oxidation fan
Factory building, it is not required to set maintenance crane, and corresponding noise countermeasure, cooling water system etc..Considerably reduce engineering cost.
4th, low-pressure oxidized slurries technological system of the invention is good with oxidation slurries effect, and simple system (contains control system)
The characteristics of, the operational management for system of being more convenient for.
Brief description of the drawings
Fig. 1 is the structural representation of one embodiment of the low-pressure oxidized slurries system of the present invention.
Wherein：
1st, oxidation fan；
2nd, oxidation air pipeline；
3rd, gas-liquid mixer；
4th, mixed flow tube；
5th, slurries pump；
6th, slurries pipeline；
7th, nozzle；
8th, former nozzle；
9th, demister；
10th, chimney；
11st, desulfurizing agent amounts to system；
12nd, magma liquid pump.
Embodiment
The feature and technology contents of the present invention can be further appreciated that for the ease of the relevant personnel of the art, in conjunction with
Embodiments of the present invention are discussed in detail in Figure of description.
Embodiment 1：
Low-pressure oxidized slurries system mainly by oxidation fan 1, oxidation air pipeline 2, gas-liquid mixer 3, mixed flow tube 4,
Slurries pump 5, slurries pipeline 6, nozzle 7 etc. form.
After desulphurization system and slurry low-pressure oxidative system are all run, the SO2 in flue gas is inhaled by the desulfurizing agent in slurries
Midwifery is returned in slurry tank into sulphite, and with slurries.
Slurries pump 5 sucks the slurries in slurry tank, is sent out by slurries pipeline 6 and is sprayed by nozzle 7, simultaneous oxidation blower fan
After outdoor air is aspirated through oxidation air pipeline 2 by 1 to be sent out, and the slurries sprayed before gas-liquid mixer with nozzle meet
Flow into simultaneously in centrifugal gas-liquid mixer, the blender is the bar that oxidation air and slurries create mixing contact well
Part, in efficient mass transfer field, sulphite is oxidized to sulfate.Slurries and remaining oxidation air after oxidation are through mixed flow tube
4 enter in purifying column, and the slurries after oxidation are fallen into slurry tank.Remaining oxidation air is then mixed into flue gas, with the net of flue gas
Change flow and be discharged into air, reach the purpose of slurry low-pressure oxidation.
Embodiment 2：
Low-pressure oxidized slurries system includes serum recycle system, oxidation air feed system and slurries oxidation unit；Oxidation
The pipeline of the conveying oxidation air of air supply system does not enter in the slurry tank slurries in purifying column, and is directly entered the slurry
In liquid oxidation device；Slurries equipped with sulphite are delivered into slurry by serum recycle system, including first device, first device
In liquid oxidation device；Oxidation air feedway, including second device, second device convey into described slurries oxidation unit
Oxidation air；Slurries oxidation unit, including 3rd device, the slurries mix oxygen with described oxidation air in 3rd device
Change, then flow into purifying column.Slurries oxidation unit is independently arranged.
Embodiment 3：
Low-pressure oxidized slurries system includes serum recycle system, oxidation air feed system and slurries oxidation unit；Oxidation
The pipeline of the conveying oxidation air of air supply system does not enter in the slurry tank slurries in purifying column, and is directly entered the slurry
In liquid oxidation device；Slurries equipped with sulphite are delivered into slurry by serum recycle system, including first device, first device
In liquid oxidation device；Oxidation air feedway, including second device, second device convey into described slurries oxidation unit
Oxidation air；Slurries oxidation unit, including 3rd device, the slurries mix oxygen with described oxidation air in 3rd device
Change, then flow into purifying column, slurries oxidation unit is arranged in outside purifying column and more than slurry tank liquid level.
Embodiment 4：
Low-pressure oxidized slurries system includes serum recycle system, oxidation air feed system and slurries oxidation unit；Oxidation
The pipeline of the conveying oxidation air of air supply system does not enter in the slurry tank slurries in purifying column, and is directly entered the slurry
In liquid oxidation device；Slurries equipped with sulphite are delivered into slurry by serum recycle system, including first device, first device
In liquid oxidation device；Oxidation air feedway, including second device, second device convey into described slurries oxidation unit
Oxidation air；Slurries oxidation unit, including 3rd device, the slurries mix oxygen with described oxidation air in 3rd device
Change, then flow into purifying column, slurries oxidation unit is arranged in outside purifying column and more than slurry tank liquid level.
3rd device includes spray system, gas-liquid mixing device, and gas-liquid mixing device is centrifugal gas-liquid mixing device, slurries
Sprayed by spray system, slurries are sucked after being met with the oxidation air sent by oxidation air feed system and flow into solution-air
Blender, in slurry tank of the slurry reflux to purifying column after gas-liquid mixing device internal oxidition.
Embodiment 5：
Low-pressure oxidized slurries system includes serum recycle system, oxidation air feed system and slurries oxidation unit；Oxidation
The pipeline of the conveying oxidation air of air supply system does not enter in the slurry tank slurries in purifying column, and is directly entered the slurry
In liquid oxidation device；Serum recycle system includes first device, and the slurries equipped with sulphite are delivered into slurry by first device
In liquid oxidation device；Oxidation air feedway includes second device, and second device conveys into described slurries oxidation unit
Oxidation air；Slurries oxidation unit includes 3rd device, and the slurries mix oxygen with described oxidation air in 3rd device
Change, then flow into purifying column, slurries oxidation unit is arranged in outside purifying column and more than slurry tank liquid level.
First device includes slurries pump 5, slurries pipeline 6；3rd device includes spray system；Slurry tank includes sulphite
Slurries sucked by slurries pump 5, send out through slurries pipeline 6, sprayed by spray system, with being sent by oxidation air feed system
Oxidation air is met simultaneously while entered in slurries oxidation unit, and the slurries after oxidation are aoxidized from slurries with remaining oxidation air and filled
Outlet discharge is put, is flowed into purifying column.The gas-liquid mixing device is spiral-flow type gas-liquid mixing device.
Embodiment 6：
Low-pressure oxidized slurries system includes serum recycle system, oxidation air feed system and slurries oxidation unit；Oxidation
The pipeline of the conveying oxidation air of air supply system does not enter in the slurry tank slurries in purifying column, and is directly entered the slurry
In liquid oxidation device；Serum recycle system includes first device, and the slurries equipped with sulphite are delivered into slurry by first device
In liquid oxidation device；Oxidation air feedway includes second device, and second device conveys into described slurries oxidation unit
Oxidation air；Slurries oxidation unit includes 3rd device, and the slurries mix oxygen with described oxidation air in 3rd device
Change, then flow into purifying column, slurries oxidation unit is arranged in outside purifying column and more than slurry tank liquid level.
The second device includes oxidation fan 1, oxidation air pipeline 2；First device includes slurries pump 5, slurries pipeline
6；3rd device includes spray system；The slurries that slurry tank includes sulphite are sucked by slurries pump 5, are sent out through slurries pipeline 6,
Sprayed by spray system, such as sprayed by nozzle, the oxidation fan is centrifugal fan, and the oxidation air pipeline 2 will
Oxidation air is sent into spiral-flow type gas-liquid mixer and slurries is aoxidized, and remaining oxidation air enters purifying column through mixed flow tube
In, it is back in the slurry tank of purifying column, remaining oxidation air is discharged into air with gas cleaning flow in purifying column through chimney.
In a preferred embodiment, mixed flow tube 6 is opened in more than the slurry tank liquid level of purifying column, and slurries are from liquid level
Side is fallen into slurry tank.
It should be noted that above-described embodiment is only specific embodiment, in other examples, pump can be other
Suction conveyer is substituted, and spray system can have the similar sprinkling equipments such as shower nozzle, injector, the netted official website of point to substitute, and gas-
Liquid mixer is also only preferably spiral-flow type gas-liquid mixing device.
It is described above, the only embodiment of this case or the explanation to embodiment, the protection domain of this case
It is not limited thereto, any one skilled in the art can readily occur in change in the technical scope that this case discloses
Change or replace, should all cover within the protection domain of this case.The protection domain of this case should using scope of the claims as
It is accurate.
Claims (10)
- A kind of 1. oxidizing process on liquid, it is characterised in thatThe oxidizing process of slurries is carried out in the slurries oxidation unit more than slurry tank liquid level：Into slurries oxidation unit Slurries and oxidation air containing sulphite are conveyed, the sulphite in slurries is oxidized to sulfate, after then aoxidizing Slurries flow into purifying column again.
- 2. oxidizing process on a kind of liquid according to claim 1, it is characterised in that the pipeline for conveying oxidation air does not enter only Change in the slurry tank slurries in tower, and be directly entered in the slurries oxidation unit.
- 3. oxidizing process on a kind of liquid according to claim 1, it is characterised in that the slurries containing sulphite are to spray Form is met with oxidation air in slurries oxidation unit, subsequently into gas-liquid mixing device.
- 4. oxidizing process on a kind of liquid according to claim 1, it is characterised in thatThe slurries oxidation unit is provided with spiral-flow type gas-liquid mixer, and the slurries containing sulphite are with oxidation air in eddy flow Met before formula gas-liquid mixer, be then sucked and flow into spiral-flow type gas-liquid mixing device, the main oxidation process of slurries Carried out in gas-liquid mixer；The efficient mass transfer field that the spiral-flow type gas-liquid mixer is formed is mixed for the slurries with oxidation air.
- A kind of 5. low-pressure oxidized slurries system, it is characterised in thatIncluding serum recycle system, oxidation air feed system and slurries oxidation unit；The pipeline of the conveying oxidation air of oxidation air feed system does not enter in the slurry tank slurries in purifying column, and directly enters Enter in the slurries oxidation unit；Slurries equipped with sulphite are delivered into slurries oxidation dress by serum recycle system, including first device, first device In putting；Oxidation air feedway, including second device, second device convey oxidation air into described slurries oxidation unit；Slurries oxidation unit, including 3rd device, the slurries and described oxidation air mixed oxidization in 3rd device, then Flow into purifying column.
- A kind of 6. low-pressure oxidized slurries system according to claim 5, it is characterised in that the slurries oxidation unit arrangement Outside purifying column and more than slurry tank liquid level.
- 7. a kind of low-pressure oxidized slurries system according to claim 5, it is characterised in that the 3rd device includes spray System, gas-liquid mixing device, gas-liquid mixing device are centrifugal gas-liquid mixing device, and slurries are sprayed by spray system, slurries with by oxygen Change after the oxidation air that air supply system is sent meets and be sucked and flow into gas-liquid mixing device, in gas-liquid mixing device internal oxidition Slurry reflux afterwards is into the slurry tank of purifying column.
- A kind of 8. low-pressure oxidized slurries system according to claim 5, it is characterised in thatThe first device includes slurries pump (5), slurries pipeline (6)；The 3rd device includes spray system；The slurries that slurry tank includes sulphite are sucked by slurries pump (5), are sent out through slurries pipeline (6), are sprayed by spray system, Oxidation air with being sent by oxidation air feed system meet and while into slurries oxidation unit, slurries after oxidation and Remaining oxidation air is exported from slurries oxidation unit and discharged, and is flowed into purifying column.
- 9. a kind of low-pressure oxidized slurries system according to claim 7, it is characterised in that the gas-liquid mixing device is rotation Streaming gas-liquid mixing device.
- A kind of 10. low-pressure oxidized slurries system according to claim 9, it is characterised in thatThe second device includes oxidation fan (1), oxidation air pipeline (2)；The oxidation fan is centrifugal fan, and oxidation air is sent into spiral-flow type gas-liquid by the oxidation air pipeline (2) Blender aoxidizes to slurries, and remaining oxidation air enters in purifying column through mixed flow tube, is back to the slurry tank of purifying column In, remaining oxidation air is discharged into air with gas cleaning flow in purifying column through chimney.
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