CN110180371A - A kind of alkali desulphurization system and its working method - Google Patents
A kind of alkali desulphurization system and its working method Download PDFInfo
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- CN110180371A CN110180371A CN201910403253.6A CN201910403253A CN110180371A CN 110180371 A CN110180371 A CN 110180371A CN 201910403253 A CN201910403253 A CN 201910403253A CN 110180371 A CN110180371 A CN 110180371A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
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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
- B01D53/46—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/608—Sulfates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The present invention relates to a kind of alkali desulphurization systems, including soda supply system, desulphurizing and dust-removing integral system and gypsum slurries processing system.The present invention is suitable for the mating boiler controller system smoke processing system in paper mill, reducing agent needed for providing desulfurization using the sodium alkali tank in the mating boiler power plant in paper mill, instead of limestone system.Desulfurization wastewater is handled using plant area pond.Using sodium hydroxide or sodium carbonate as absorbent to the SO in flue gas2It is absorbed, the absorbing liquid containing sodium sulfite and sodium hydrogensulfite is generated, to SO in flue gas2Absorption efficiency is high, and desulfurization effect is good；Conventional limestone-desulfurization of gypsum system is simplified, present system is simple, and it is easy to maintenance, it is energy-saving.
Description
Technical field
The present invention relates to efficient alkaline process desulfuration field, it is related to a kind of alkali desulphurization system and its working method.
Background technique
The sulfur dioxide contained in flue gas can generate pollution very serious to atmospheric environment, and the serious ecology that destroys is put down
Weighing apparatus, and great harm is produced to the health of animals and plants and the mankind, acid rain can also largely occur, to building
Corroded and is destroyed, it is serious to affect ecological environment and living environment.So being generated to effectively reduce sulfur dioxide
Harm, relevant departments constantly research and develop relevant Treatment process.At this stage, sulfur dioxide pollution is administered
Technological means is mainly flue gas desulfurization, and in the industry, predominantly Wet Flue Gas Desulfurization Technique.Wherein Wet Flue Gas Desulfurization Technique has de-
The advantages that sulphur efficiency is high and reaction speed is fast, therefore be widely used in desulfuration field.
Wet process of FGD generally refers to the desulfurization that pulpous state absorbent and liquid-absorbant etc. carry out under wet condition
Processing and desulfurization product processing.This sulfur method has the advantages such as desulfuration efficiency is high and reaction speed is fast, but is sending out
During exhibition, it should timely be solved to the problems such as smoke temperature drop and fouling.The Wet Flue Gas Desulfurization Technique of comparative maturity
Predominantly sea water desulfuration, double alkali method desulfurizing, calcium-based desulfurization, the ammonia process of desulfurization and Mg-basic desulphuration etc..
Calcium-based desulfurization: the calcium-based desulfurization technology (lime stone -- gypsum) generally used is often by lime stone slurry pair
The sulfur dioxide contained in flue gas is absorbed, and is reacted and is generated calcium sulfite, then becomes sulphur by the dioxygen oxidation in air
Sour calcium.At this stage, calcium-based desulfurization technology is a kind of more mature sulfur removal technology, and desulfurization degree has been over 90%.Meanwhile
Calcium-based desulfurization technology while having the advantages such as operational reliability is high and high-efficient, that there is also discharge of wastewater is more,
It takes up a large area, initial investment is big and the drawbacks such as the easy fouling of equipment.
Mg-basic desulphuration: Mg-basic desulphuration technology be typically chosen have abundant source and the active magnesia of good chemical as
Raw material is fabricated to it in slurries, then is absorbed by magnesium hydroxide slurry to the sulfur dioxide in flue gas.But magnesium processes desulfurization
Technology has the drawbacks such as costly and complex process.
The ammonia process of desulfurization: ammonia-process desulfurization technique is broken generally into two steps, i.e. scrubbing CO_2 and oxidative hydrogen
Ammonium.First, the purpose of scrubbing CO_2 predominantly washs the sulfur dioxide contained in flue gas, obtain flue gas only
Change, to generate ammonium sulfite solution.Second, the purpose of oxidative hydrogen ammonium predominantly ammonium sulfite solution in air
Oxidation reaction occurs, generates ammonium sulfate, then make it dry crystallization.Ammonia-process desulfurization technique has desulfuration efficiency height, technique
Simple and by-product ammonium sulfate can be used as the advantage of chemical fertilizer.But it during carrying out desulfurization, is carried out to ammonium sulfite
When oxidation, then a large amount of additional energy is needed, increased so as to cause the operating cost and energy consumption of system；And ammonia is also
Have volatility, therefrom caused by ammonia loss and phenomena such as tail gas pollution, both the utilization rate of ammonia can be promoted to decrease,
It also results in and secondary pollution occurs.Present on these drawbacks all to the high-efficient development of ammonia-process desulfurization technique produce restriction with
Inhibit.
Double alkali method desulfurizing: the advantage that double alkali method desulfurizing technology has predominantly utilizes alkaline absorption solution to realize desulfurization, then leads to
Cross the new absorbing liquid of the generations such as limestone powder and milk of lime.But when operating, sodium sulfite will appear oxidation reaction generation
Sodium sulphate, and sodium sulphate is difficult to regenerate, so needing to add always sodium hydroxide either sodium sulfite into system, this just exists
Increase the consumption of alkali in very big degree, to produce serious influence to gypsum quality.
Chinese patent CN202366619U provides a kind of sulfur removal technology with desulfurization bacterium storage tank, and flue gas successively passes through air inlet
Storage tank, deduster, cooling tower enter desulfurizing tower, and the circulation fluid counter current contacting come with desulfurization storage tank carries out desulfurization, desulfurizing tower lower end
It is connected with desulfurization storage tank, desulfurization bacterium storage tank is connected by water pump with spray system in tower.
But the technical solution is recycled using desulfurization bacterium solution as desulfurizing agent, sulfate can accumulate in system always and
It cannot be discharged；Coal-fired flue-gas amount is very big, and air inlet storage tank is less applicable in.
Chinese patent CN101073745A discloses a kind of bamboo-carbon filler biological drip filtering tower removing sulfur dioxide in flue gas
Method, this method sulfur oxidizing bacterium is by the SO in flue gas2It is oxidized to sulfate, byproduct FeSO4；But the technology needs
For autogamy nutrient solution as carbon source, economy is unobvious；Flue gas is directly entered absorption tower simultaneously, is not suitable for processing industrial high temperature cigarette
Gas.
Summary of the invention
In view of the shortcomings of the prior art, solving the failure of traditional Dual alkali the invention discloses a kind of alkali desulphurization system
Problem, system is simple, easy to maintenance, energy-saving, the alkali desulphurization system and its work side that cost of investment is low, desulfurization effect is good
Method, desulfuration efficiency reach 99% or more, and can reduce processing gypsum slurries needed for waste water treatment system, reduce cost, reach
The purpose of energy-saving consumption-reducing.
To achieve the goals above, the invention adopts the following technical scheme:
A kind of alkali desulphurization system, including soda supply system, desulphurizing and dust-removing integral system and gypsum slurries processing system；
Soda supply system, the soda supply system includes slurry supply pump and sodium alkali tank；
Desulphurizing and dust-removing integral system, the desulphurizing and dust-removing integral system include desulfurizing tower ontology, circulating pump and oxidation fan,
The desulfurizing tower ontology is from top to bottom successively arranged wet cottrell, demister, spraying layer, absorption tower and slurry pool；
Gypsum slurries processing system, including slurry pump, slurries baffle-box, slurries efflux pump and mummifying pool, the slurries baffle-box
It is equipped with liquidometer.
Preferably, lye pump connection sodium alkali tank and slurry pool, the reducing agent of sodium alkali tank storage is NaOH or Na2CO3, dense
Spend 10-20%；It is equipped between lye pump and slurry pool for slurry valve；Return valve is equipped between lye pump and sodium alkali tank.
Preferably, circulating pump connection slurry pool and spraying layer, spray layer number is 2-5 layers, and circulating pump quantity is 1-5
Platform.Spraying layer material is 304 stainless steels, and wall thickness is greater than 10mm, and circulating pump is frequency conversion.
Preferably, being demister above spraying layer, the demister number of plies is 2 layers or 3 layers, and demister is 2 layers of ridge type or 2
Layer+1 layer of tubular type of ridge type；Be wet cottrell above demister, the diameter of wet cottrell and absorption tower it is straight
Diameter is identical；Chimney is set above wet cottrell, Diameter of chimney is equal to 0.3-0.5 times of wet cottrell diameter,
Length is 5-10 times of Diameter of chimney.Chimney material is carbon steel, 304 stainless steels, 2205 stainless steels, 316L stainless steel or glass
Steel.
Preferably, slurry pool is equipped with pH meter and densitometer, pH meter quantity is 2-3, and densitometer quantity is 1-3, pH
Meter is arranged in the two sides of slurry pool with densitometer；PH meter is longitudinally arranged respectively with densitometer, spacing 500-800mm, and with
Slurry pool distance from bottom is greater than 1500mm.
Preferably, slurry pool is connected with oxidation fan, oxidation fan tube outlet, which goes out, is equipped with blender, quantity 3-5
A, blender centre-height and slurry pool distance from bottom are greater than 1000mm.
A kind of working method of alkali desulphurization system, flue gas successively pass through spraying layer, demister, wet cottrell,
And it is drained into atmosphere from chimney；SO in flue gas2Gas occurs chemical reaction with the soda lye in desulfurization slurry and is removed；Sodium
Lye is delivered in desulfurization slurry by sodium alkali tank by lye pump；The gypsum slurries that desulphurization reaction generates drain into slurries by slurry pump
Surge tank, and mummifying pool processing is drained by slurries efflux pump；Oxygen needed for oxidation fan provides chemical reaction, blender increase
Chemical reaction rate.
Preferably, now opening for slurry valve when ph is counted less than 5.2, return valve being turned off after 5s, when ph is counted
When higher than 5.8, return valve is opened, is turned off after 5s for slurry valve, lye pump working method is long open state.
Preferably, opening slurries outlet when slurries baffle-box liquidometer shows that numerical value is higher than the 80% of box height
Gypsum slurries in baffle-box are drained into mummifying pool by pump, when liquid level is lower than the 15% of height, stop slurries efflux pump, top is stirred
It is normally opened for mixing device.
Preferably, when densitometer is higher than 1150 kg/m3When, slurry pump is opened, when densitometer is less than 1050 kg/m3When,
Close slurry pump.
The beneficial effects of the present invention are: the present invention is suitable for the mating boiler controller system smoke processing system in paper mill, using making
Reducing agent needed for sodium alkali tank in the mating boiler power plant of paper plant provides desulfurization, instead of limestone system.Utilize plant area pond
Handle desulfurization wastewater.Using sodium hydroxide or sodium carbonate as absorbent to the SO in flue gas2It is absorbed, is generated containing Asia
The absorbing liquid of sodium sulphate and sodium hydrogensulfite, to SO in flue gas2 Absorption efficiency is high, and desulfurization effect is good；Simplify conventional lime
Stone-desulfurization of gypsum system, present system is simple, easy to maintenance, energy-saving.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
In figure, 1, desulfurizing tower ontology；2, spraying layer；3, demister；4, circulating pump；5, wet cottrell；6, pH meter；
7, densitometer；8, oxidation fan；9, absorption tower；10, slurry pool；11, blender；12, slurry pump；13, slurries baffle-box；14,
Slurries buffer liquidometer；15, slurries efflux pump；16, sodium alkali tank；17, slurry supply pump；18, for slurry valve；19, return valve；20, cigarette
Chimney；21, mummifying pool.
Specific embodiment
Below in conjunction with specific embodiment and attached drawing, the present invention will be further explained:
In the present invention, as without refering in particular to, equipment is existing commonly used equipment.
Referring to Fig.1, a kind of alkali desulphurization system, including soda supply system, desulphurizing and dust-removing integral system and calcium plaster
Liquid treating system；
Soda supply system, the soda supply system include slurry supply pump 17 and sodium alkali tank 16；
Desulphurizing and dust-removing integral system, the desulphurizing and dust-removing integral system include desulfurizing tower ontology 1, circulating pump 4 and oxidation wind
Machine 8, the desulfurizing tower ontology 1 be from top to bottom successively arranged wet cottrell 5, demister 3, spraying layer 2, absorption tower 9 with
Slurry pool 10；Slurry pool 10 is equipped with pH meter 6 and densitometer 7, and 6 quantity of pH meter is 2-3, and 7 quantity of densitometer is 1-3, pH meter 6
The two sides of slurry pool 10 are arranged in densitometer 7；PH meter 6 is longitudinally arranged respectively with densitometer 7, spacing 500-800mm, and
It is greater than 1500mm with 10 distance from bottom of slurry pool.Slurry pool 10 is connected with oxidation fan 8, and 8 tube outlet of oxidation fan goes out to be equipped with
Blender 11, quantity are 3-5, and 11 centre-height of blender and 10 distance from bottom of slurry pool are greater than 1000mm.
Lye pump 17 connects sodium alkali tank 16 and slurry pool 10, and the reducing agent that sodium alkali tank 16 stores is NaOH or Na2CO3, concentration
10-20%；It is equipped between lye pump 17 and slurry pool 10 for slurry valve 18；Return valve is equipped between lye pump 17 and sodium alkali tank 16
19。
Gypsum slurries processing system, including slurry pump 12, slurries baffle-box 13, slurries efflux pump 15 and mummifying pool 21, institute
Slurries baffle-box is stated equipped with liquidometer 14.
3 number of plies of demister is 2 layers or 3 layers, and demister 3 is+1 layer of tubular type of 2 layers of ridge type or 2 layers of ridge type；On demister 3
Side is wet cottrell 5, and the diameter of wet cottrell 5 is identical as the diameter on absorption tower 9；Wet cottrell 5
Chimney 20 is arranged in top, and 20 diameter of chimney is equal to 0.3-0.5 times of 5 diameter of wet cottrell, and length is Diameter of chimney
5-10 times.
Liquid level is calculated as radar type or magnetic turning plate formula.
Smoke inlet is arranged in the middle part of absorption tower, and sulfur-containing smoke gas is entered in absorption tower and under spraying layer spray by entrance
Slurry liquid contacts remove sulfur dioxide, and slurries fall through into slurry pool, and the flue gas by desulfurization is quiet with wet type upwardly through demister
Electric precipitator is discharged by chimney；Circulating pump connects slurry pool and spraying layer, so that serum recycle, improves desulfurization
Efficiency, spraying layer can have 2-5 layers, correspond with the pipeline of circulating pump, and every layer of spraying layer is disposed with several nozzles, refinement slurry
Liquid comes into full contact with it with sulfur-containing smoke gas, and the coverage rate of every layer of spray reaches 200% or more.When ph is counted less than 5.2, now open
For slurry valve, return valve is turned off after 5s, when ph meter is higher than 5.8, opens return valve, confession is turned off after 5s
Slurry valve, lye pump working method are long open state.Circulating pump at least 1 normally opened, and oxidation fan is normally opened with blender.
When slurries baffle-box liquidometer shows that numerical value is higher than the 80% of box height, slurries efflux pump is opened, by baffle-box
In gypsum slurries drain into mummifying pool, when liquid level be lower than height 15% when, stop slurries efflux pump, overhead be it is normally opened.
When densitometer is higher than 1150 kg/m3When, slurry pump is opened, when densitometer is less than 1050 kg/m3When, close plasma discharge
Pump.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations, although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of alkali desulphurization system, which is characterized in that including soda supply system, desulphurizing and dust-removing integral system and calcium plaster
Liquid treating system；
Soda supply system, the soda supply system include slurry supply pump (17) and sodium alkali tank (16)；
Desulphurizing and dust-removing integral system, the desulphurizing and dust-removing integral system include desulfurizing tower ontology (1), circulating pump (4) and oxygen
Change blower (8), the desulfurizing tower ontology (1) is from top to bottom successively arranged wet cottrell (5), demister (3), spraying layer
(2), absorption tower (9) and slurry pool (10)；
Gypsum slurries processing system, including slurry pump (12), slurries baffle-box (13), slurries efflux pump (15) and mummifying pool
(21), the slurries baffle-box is equipped with liquidometer (14).
2. a kind of alkali desulphurization system according to claim 1, which is characterized in that lye pump (17) connects sodium alkali tank (16)
With slurry pool (10), the reducing agent of sodium alkali tank (16) storage is NaOH or Na2CO3, concentration 10-20%；Lye pump (17) and slurries
It is equipped between pond (10) for slurry valve (18)；Return valve (19) are equipped between lye pump (17) and sodium alkali tank (16).
3. a kind of alkali desulphurization system according to claim 1, which is characterized in that circulating pump (4) connects slurry pool (10)
With spraying layer (2), spraying layer number is 2-5 layers, and circulating pump quantity is 1-5 platform.
4. a kind of alkali desulphurization system according to claim 1, which is characterized in that be demister above spraying layer (2)
(3), demister (3) number of plies is 2 layers or 3 layers, and demister (3) is+1 layer of tubular type of 2 layers of ridge type or 2 layers of ridge type；Demister (3)
Top is wet cottrell (5), and the diameter of wet cottrell (5) is identical as the diameter of absorption tower (9)；Wet electrostatic
Chimney (20) are set above deduster (5), chimney (20) diameter is equal to 0.3-0.5 times of wet cottrell (5) diameter, long
Degree is 5-10 times of Diameter of chimney.
5. a kind of alkali desulphurization system according to claim 1, which is characterized in that slurry pool (10) be equipped with pH meter (6) with
Densitometer (7), pH meter (6) quantity are 2-3, and densitometer (7) quantity is 1-3, and pH meter (6) is respectively arranged with densitometer (7)
In the two sides of slurry pool (10)；PH meter (6) is longitudinally arranged respectively with densitometer (7), spacing 500-800mm, and and slurry pool
(10) distance from bottom is greater than 1500mm.
6. a kind of alkali desulphurization system according to claim 4, which is characterized in that slurry pool (10) and oxidation fan (8)
It is connected, oxidation fan (8) tube outlet goes out to be equipped with blender (11), and quantity is 3-5, blender (11) centre-height and slurries
Pond (10) distance from bottom is greater than 1000mm.
7. a kind of working method of alkali desulphurization system as described in claim 1, which is characterized in that flue gas is successively by spray
Layer, demister, wet cottrell, and drained into atmosphere from chimney；SO in flue gas2Soda in gas and desulfurization slurry
Liquid occurs chemical reaction and is removed；Soda lye is delivered in desulfurization slurry by sodium alkali tank by lye pump；Desulphurization reaction generates
Gypsum slurries slurries surge tank is drained by slurry pump, and mummifying pool processing is drained by slurries efflux pump；Oxidation fan offerization
Oxygen needed for learning reaction, blender increase chemical reaction rate.
8. a kind of working method of alkali desulphurization system according to claim 7, which is characterized in that when ph is counted less than 5.2
When, it now opens for slurry valve, return valve is turned off after 5s, when ph meter is higher than 5.8, return valve is opened, by 5s
After turn off for slurry valve, lye pump working method is long open state.
9. a kind of working method of alkali desulphurization system according to claim 7, which is characterized in that when slurries baffle-box liquid
When position meter display numerical value is higher than the 80% of box height, slurries efflux pump is opened, the gypsum slurries in baffle-box are drained into desiccation
Pond stops slurries efflux pump when liquid level is lower than the 15% of height, and overhead is normally opened.
10. a kind of working method of alkali desulphurization system according to claim 7, which is characterized in that when densitometer is higher than
1150 kg/m3When, slurry pump is opened, when densitometer is less than 1050 kg/m3When, close slurry pump.
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