CN105540936B - A kind of desulfurization wastewater flue gas softening pretreatment unit and preprocess method - Google Patents
A kind of desulfurization wastewater flue gas softening pretreatment unit and preprocess method Download PDFInfo
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- CN105540936B CN105540936B CN201610075039.9A CN201610075039A CN105540936B CN 105540936 B CN105540936 B CN 105540936B CN 201610075039 A CN201610075039 A CN 201610075039A CN 105540936 B CN105540936 B CN 105540936B
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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
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
Abstract
The invention discloses a kind of desulfurization wastewater flue gases to soften pretreatment unit, including：Aerating wastewater settling tank, it is interior to set sludge sewage draining exit equipped with aerator A and online pH monitors A, bottom；PH regulating reservoirs, it is interior to be equipped with aerator B and online pH monitors B；Air blower is connect with aerating wastewater settling tank, pH regulating reservoirs and flue gas heat-exchange unit；Automatic control device is connect with valve, the air blower on online pH monitors A, online pH monitors B, pipeline, and automatic control device is according to the monitoring result of online pH monitors A and online pH monitors B, the switch of control valve and air blower.Beneficial effects of the present invention：Efficiently use the CO in flue gas2, fume afterheat is reduced, power-plant flue gas thermal pollution is reduced while reducing carbon emission；Flue gas as softening effectively reduces a large amount of moisture evaporation and drop entrainment caused by fume high-temperature in flue gas aeration softening process by pre- cooling；Equipment cost is reduced, safety is improved.
Description
Technical field
The present invention relates to environment water-treatment technology fields in flue gas desulphurization system, in particular to a kind of desulfurization wastewater
Flue gas softens pretreatment unit and preprocess method.
Background technology
As a kind of technology maturation, generation technology reliable for operation, cost economy, one direct join of thermoelectricity will be used as China for a long time
Important component in energy resource structure.With economic continuous development, China's thermoelectricity installed capacity rises rapidly, and thermoelectricity causes
Environmental problem also increasingly cause everybody pay close attention to.For the desulfurization wastewater of thermal power plant due to complicated component, treatment technology difficulty is big, is
Concentrate one of most intractable waste in coal-burning power plant.Contain in desulfurization wastewater contents of many kinds of heavy metal ion and very high concentrations calcium,
Magnesium, sulfate radical and chlorion.Traditional desulfurization wastewater processing generally use chemical precipitation method get rid of each heavy metal species in water from
Son, but this method is costly, and calcium and magnesium ion in waste water can not be effectively removed.With the raising of China's correlation environmental requirement, pass
Chemical precipitation method of uniting will be hard to carry on.Therefore, the further treatment technique of desulfurization wastewater is developed, will be led as China's water process from now on
One key issues in domain.
The removal of a large amount of calcium ions and magnesium ions in water, conventional processes are that milk of lime adds soda ash to handle.Its principle is to water
Middle introducing carbonate forms calcium carbonate and magnesium hydrate precipitate with hydroxyl.Due to containing a large amount of calcium ions in desulfurization wastewater, this
Kind method needs to consume a large amount of soda ash, and main function is that carbonate is introduced into water.The departments such as power plant daily can be into environment
Discharge a large amount of flue gases, the carbon dioxide containing 15-18% concentration in this flue gas, and temperature is up to 80 degree or so.Carbon dioxide
It is to cause the major pollutants of greenhouse effects, while a large amount of high-temperature flue gas can also cause environment flue gas thermal pollution.The section of flue gas
Energy emission reduction is also the direction that each high-power station endeavours always research.And the carbon dioxide in power-plant flue gas can be desulfurization wastewater just
Abundant carbonate is provided.In addition, traditional desulfurization wastewater is usually required in processing end by being added in hydrochloric acid and desulfurization wastewater
In a large amount of hydroxyl.This will not only consume a large amount of hydrochloric acid, increase operating cost.And it is different from the changes such as general soda ash and lime
Medicament is learned, the storage of hydrochloric acid and acid solution configuration also have good requirement to the anti-corrosion of equipment and pipeline, and which increases techniques
Installation cost improves safety requirements.
Invention content
To solve the above problems, the purpose of the present invention is to provide a kind of CO efficiently used in flue gas2, reduce coal-fired electricity
The desulfurization wastewater flue gas softening pretreatment unit and preprocess method of factory's carbon emission.
The present invention provides a kind of desulfurization wastewater flue gases to soften pretreatment unit, including：
Aerating wastewater settling tank, input terminal are connect with one end of sodium hydroxide medicament transfer pipeline, the sodium hydroxide
Medicament transfer pipeline is equipped with valve A, one end of the output end and softening wastewater supernatant fluid pipeline of the aerating wastewater settling tank
Connection, the softening wastewater supernatant fluid pipeline are equipped with valve C, and the bottom of the aerating wastewater settling tank is equipped with sludge blowdown
Mouthful, the sludge sewage draining exit is connect with mud line, and the mud line is equipped with valve B；
Aerator A is set in the aerating wastewater settling tank, the aerator A and the one of flue gas aeration branch A
End connection, the flue gas aeration branch A are equipped with valve F；
Online pH monitor A, are set in aerating wastewater settling tank；
PH regulating reservoirs, input terminal are connect with the other end of the softening wastewater supernatant fluid pipeline, the pH regulating reservoirs
Output end is connect with one end of pH regulating reservoir discharge pipe lines, and the pH regulating reservoirs discharge pipe line is equipped with valve D；
Aerator B is set in the pH regulating reservoirs, and one end of the aerator B and flue gas aeration branch B connect
It connects, the flue gas aeration branch B is equipped with valve G；
Online pH monitor B, are set in the pH regulating reservoirs；
Air blower, one end are connect with one end of flue gas aerating pipelines, and the other end of the air blower is exposed with the flue gas
The other end connection of the other end, flue gas aeration branch B of gas branch A；
Flue gas heat-exchange unit, top are connect with power plant smoke-exhaust pipeline, and the bottom end of the flue gas heat-exchange unit and cooling flue gas are total
One end of pipeline connects, the other end of the cooling flue gas main pipe rail and the other end of the flue gas aerating pipelines, cooling flue gas
One end of overflow passage connects, and the cooling smoke overflow pipeline is equipped with valve E, head end and the pH tune of the flue gas heat-exchange unit
The other end connection of pond discharge pipe line is saved, the end of the flue gas heat-exchange unit is connect with heat exchanger outlet pipeline；
Automatic control device, with the online pH monitors A, the online pH monitors B, the valve A, the valve
Door B, the valve C, the valve D, the valve E, the valve F, the valve G, air blower connection, it is described automatic
Control device is the control valve A, described according to the monitoring result of the online pH monitors A and the online pH monitors B
The switch of valve B, the valve C, the valve D, the valve E, the valve F, the valve G and the air blower.
As further improvement of the invention, the aerating wastewater settling tank is infundibulate wide at the top and narrow at the bottom.
As further improvement of the invention, the aerator A and the aerator B are respectively arranged on the waste water and expose
Bottom end inside gas settling tank and the pH regulating reservoirs.
As further improvement of the invention, the aerator A and the aerator B are respectively arranged on the waste water and expose
Top inside gas settling tank and the pH regulating reservoirs.
The present invention also provides a kind of desulfurization wastewater flue gases to soften preprocess method, and this approach includes the following steps：
Step 1, desulfurization wastewater being introduced into the aerating wastewater settling tank, the automatic control device opens the valve A,
Sodium hydroxide medicament is introduced into the aerating wastewater settling tank, the sodium hydroxide medicament is uniformly mixed with the desulfurization wastewater,
After the pH value adjustment of mixed dosing waste water to 12.5~14, the automatic control device closes the valve A；
Step 2, step 1 complete 5~after forty minutes, the automatic control device opens the air blower and the valve F,
Cooling flue gas is introduced into the aerating wastewater settling tank；
Meanwhile the online pH monitors A monitors the variation of pH value in the aerating wastewater settling tank, when the waste water exposes
When the pH value of dosing waste water is reduced to 10.5~12.5 in gas settling tank, the automatic control device closes the valve F and institute
Air blower is stated, stop being aerated and the dosing waste water in the aerating wastewater settling tank is made to start to settle；
Step 3, step 2 complete 5~after forty minutes, the automatic control device opens the valve C, by aeration tank supernatant
After liquid introduces the pH regulating reservoirs, the automatic control device closes the valve C, and opens the valve B so that sludge from
The sludge sewage draining exit of aerating wastewater settling tank bottom is discharged, after sludge is drained, described in the automatic control device closing
Valve B；
Meanwhile the automatic control device opens the valve G and the air blower, starts to be aerated, at this point, described online
PH monitors B monitors the variation of pH value in the pH regulating reservoirs, when the pH value of supernatant in the pH regulating reservoirs is reduced to 5~8
When, the automatic control device closes the valve G and the air blower；
Step 4, the automatic control device opens the valve D, and the supernatant after flue gas is acidified is introduced the cigarette
Gas heat exchanger；
Meanwhile high-temperature flue gas heating of supernatant is introduced into the flue gas heat-exchange unit, which flows through the flue gas heat exchange
It is discharged after device heating.
It is described in the desulfurization wastewater flue gas sofening treatment device continuous service as further improvement of the invention
Aerating wastewater settling tank, the pH regulating reservoirs and the flue gas heat-exchange unit alternate run so that the desulfurization wastewater flue gas softening
Processing unit persistently produces water.
As further improvement of the invention, high-temperature flue gas continues into the flue gas heat-exchange unit, when the aerating wastewater
When settling tank is not aerated with the pH regulating reservoirs, the air blower is closed, and the automatic control device is beaten automatically
The valve E is opened, the excessive flue gas that cools down introduces power plant's smoke-exhaust pipeline by the cooling smoke overflow pipeline.
It is further improved as of the invention, in step 1, it is heavy that desulfurization wastewater introduces the aerating wastewater under the effect of gravity
Pond drops.
It is further improved as of the invention, in step 1, the sodium hydroxide medicament is that mass concentration is 1%~40%
Sodium hydroxide solution.
As further improvement of the invention, cooling flue-gas temperature is 25~60 DEG C in the cooling flue gas main pipe rail.
Beneficial effects of the present invention are：
1, waste discharge flue gas outside power plant is combined with the desulfurization wastewater in industrial production, efficiently uses the CO in flue gas2, drop
Low fume afterheat can reduce power-plant flue gas thermal pollution while reducing carbon emission；
2, the flue gas as softening can be reduced effectively in flue gas aeration softening process by pre- cooling because of fume high-temperature institute
A large amount of moisture evaporation and drop is caused to be carried secretly；
3, it can be changed to desulfurization wastewater pH value is adjusted with hydrochloric acid in traditional desulfuration waste water treatment process with CO in flue gas2In
With to reduce equipment cost, improve safety.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of desulfurization wastewater flue gas softening pretreatment unit described in the embodiment of the present invention；
Fig. 2 is a kind of flow diagram of desulfurization wastewater flue gas softening preprocess method described in the embodiment of the present invention.
In figure,
1, sodium hydroxide medicament transfer pipeline；2, valve A；3, aerating wastewater settling tank；4, aerator A；5, online pH
Monitor A；6, mud line；7, valve B；8, soften wastewater supernatant fluid pipeline；9, valve C；10, pH regulating reservoirs；11, aeration dress
Set B；12, online pH monitors B；13, pH regulating reservoirs discharge pipe line；14, valve D；15, power plant's smoke-exhaust pipeline；16, flue gas heat exchange
Device；17, cool down flue gas main pipe rail；18, cool down smoke overflow pipeline；19, valve E；20, flue gas aerating pipelines；21, air blower；
22, flue gas aeration branch A；23, valve F；24, flue gas aeration branch B；25, valve G.
Specific implementation mode
It is described in further detail below by specific embodiment and in conjunction with attached drawing to the present invention.
Embodiment 1, as shown in Figure 1, a kind of desulfurization wastewater flue gas of the embodiment of the present invention softens pretreatment unit, including hydrogen
Sodium oxide molybdena medicament transfer pipeline 1, valve A2, aerating wastewater settling tank 3, aerator A4, online pH monitors A5, mud line
6, valve B7, softening wastewater supernatant fluid pipeline 8, valve C9, pH regulating reservoir 10, aerator B11, online pH monitors B12, pH
Regulating reservoir discharge pipe line 13, valve D14, power plant's smoke-exhaust pipeline 15, flue gas heat-exchange unit 16, cooling flue gas main pipe rail 17, cooling cigarette
Gas overflow passage 18, valve E19, flue gas aerating pipelines 20, air blower 21, flue gas aeration branch A22, valve F23, flue gas aeration
Branch B24, valve G25 and automatic control device.
The input terminal of aerating wastewater settling tank 3 is connect with one end of sodium hydroxide medicament transfer pipeline 1, sodium hydroxide medicament
Transfer pipeline 1 is equipped with valve A2, and the output end of aerating wastewater settling tank 3 is connect with one end of softening wastewater supernatant fluid pipeline 8,
Soften wastewater supernatant fluid pipeline 8 and be equipped with valve C9, the bottom of aerating wastewater settling tank 3 is equipped with sludge sewage draining exit, sludge blowdown
Mouth is connect with mud line 6, and mud line 6 is equipped with valve B7.Aerator A4 is set in aerating wastewater settling tank 3, aeration
Device A4 is connect with one end of flue gas aeration branch A22, and flue gas is aerated branch A22 and is equipped with valve F23.Online pH monitors
A5 is set in aerating wastewater settling tank 3.
The input terminal of pH regulating reservoirs 10 is connect with the other end of softening wastewater supernatant fluid pipeline 8, the output of pH regulating reservoirs 10
End is connect with one end of pH regulating reservoirs discharge pipe line 13, and pH regulating reservoirs discharge pipe line 13 is equipped with valve D14.Aerator B11
In pH regulating reservoirs 10, aerator B11 is connect with one end of flue gas aeration branch B24, and flue gas aeration branch B24 is equipped with
Valve G25.Online pH monitors B12 is set in pH regulating reservoirs 10.
One end of air blower 21 is connect with one end of flue gas aerating pipelines 20, the other end and the flue gas aeration branch of air blower 21
The other end connection of the other end, flue gas aeration branch B24 of road A22.
The top of flue gas heat-exchange unit 16 is connect with power plant smoke-exhaust pipeline 15, and the bottom end of flue gas heat-exchange unit 16 and cooling flue gas are total
One end of pipeline 17 connects, and the other end of cooling flue gas main pipe rail 17 overflows with the other end of flue gas aerating pipelines 20, cooling flue gas
The one end on flow tube road 18 connects, and cooling smoke overflow pipeline 18 is equipped with valve E19, and head end and the pH of flue gas heat-exchange unit 16 are adjusted
The other end of pond discharge pipe line 13 connects, and the end of flue gas heat-exchange unit 16 is connect with heat exchanger outlet pipeline.
Automatic control device and online pH monitors A5, online pH monitors B12, valve A2, valve B7, valve C9, valve
Door D14, valve E19, valve F23, valve G25, air blower 21 connect, automatic control device according to online pH monitors A5 and
The monitoring result of line pH monitors B12, control valve A2, valve B7, valve C9, valve D14, valve E19, valve F23, valve
The switch of G25 and air blower 21.
Wherein, aerator A4 and aerator B11 is respectively arranged on inside aerating wastewater settling tank 3 and pH regulating reservoirs 10
Bottom end or top.
Further, for the ease of the discharge of sludge, aerating wastewater settling tank 3 is infundibulate wide at the top and narrow at the bottom.
Embodiment 2, as shown in Fig. 2, the present invention also provides a kind of desulfurization wastewater flue gases to soften preprocess method, this method
Include the following steps：
Step 1, under the effect of gravity, desulfurization wastewater is introduced into aerating wastewater settling tank 3, automatic control device opens valve
Sodium hydroxide medicament is introduced aerating wastewater settling tank 3 by A2, and sodium hydroxide medicament is uniformly mixed with desulfurization wastewater, after mixing
Dosing waste water pH value adjustment to after 12.5~14, automatic control device closes valve A2；
Step 2, step 1 complete 5~after forty minutes, automatic control device opens air blower 21 and valve F23, by the cigarette that cools down
Gas introduces aerating wastewater settling tank 3；
Meanwhile online pH monitors A5 monitors the variation of pH value in aerating wastewater settling tank 3, when aerating wastewater settling tank 3
When the pH value of middle dosing waste water is reduced to 10.5~12.5, automatic control device closes valve F23 and air blower 21, stops aeration
And the dosing waste water in aerating wastewater settling tank 3 is made to start to settle；
Step 3, step 2 complete 5~after forty minutes, automatic control device open valve C9, aeration tank supernatant is introduced
After pH regulating reservoirs 10, automatic control device closes valve C9, and opens valve B7 so that sludge is from 3 bottom of aerating wastewater settling tank
The sludge sewage draining exit in portion is discharged, and after sludge is drained, automatic control device closes valve B7；
Meanwhile automatic control device opens valve G25 and air blower 21, starts to be aerated, at this point, online pH monitors B12
The variation of pH value automatically controls dress when the pH value of supernatant in pH regulating reservoirs 10 is reduced to 5~8 in monitoring pH regulating reservoirs 10
It sets and closes valve G25 and air blower 21；
Step 4, automatic control device opens valve D14, and the supernatant after flue gas is acidified is introduced flue gas heat-exchange unit 16；
Meanwhile high-temperature flue gas heating of supernatant is introduced into flue gas heat-exchange unit 16, which flows through flue gas heat-exchange unit 16 and adds
It is discharged after heat.
In desulfurization wastewater flue gas sofening treatment device continuous service, aerating wastewater settling tank 3, pH regulating reservoirs 10 and flue gas
16 alternate run of heat exchanger so that desulfurization wastewater flue gas sofening treatment device persistently produces water.High-temperature flue gas continues into flue gas and changes
Hot device 16, when aerating wastewater settling tank 3 is not aerated with pH regulating reservoirs 10, air blower 21 is closed, and is automatically controlled
Device automatically opens valve E19, and the excessive flue gas that cools down introduces power plant's smoke-exhaust pipeline 15 by the smoke overflow pipeline 18 that cools down.
Wherein, sodium hydroxide medicament is the sodium hydroxide solution that mass concentration is 1%~40%.Cool down flue gas main pipe rail 17
Middle cooling flue-gas temperature is 25~60 DEG C.
The desulfurization wastewater that waste discharge flue gas outside power plant is combined composition by the present invention with the desulfurization wastewater in industrial production softens
Pretreatment unit can efficiently use the CO2 in flue gas and reduce fume afterheat, while reducing carbon emission, can reduce
Power-plant flue gas thermal pollution.Meanwhile the flue gas for being used as softening in the present invention can effectively reduce flue gas aeration softening by pre- cooling
A large amount of moisture evaporation and drop entrainment caused by fume high-temperature in the process.In addition, device and method of the present invention can be with
It is changed to be neutralized with CO2 in flue gas by desulfurization wastewater pH value is adjusted with hydrochloric acid in traditional desulfuration waste water treatment process, to reduce
The equipment cost of system improves the safety of system.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of desulfurization wastewater flue gas softens pretreatment unit, which is characterized in that including：
Aerating wastewater settling tank（3）, input terminal and sodium hydroxide medicament transfer pipeline（1）One end connection, the hydroxide
Sodium medicament transfer pipeline（1）It is equipped with valve A（2）, the aerating wastewater settling tank（3）Output end with softening wastewater supernatant fluid
Pipeline（8）One end connection, the softening wastewater supernatant fluid pipeline（8）It is equipped with valve C（9）, the aerating wastewater settling tank
（3）Bottom be equipped with sludge sewage draining exit, the sludge sewage draining exit and mud line（6）Connection, the mud line（6）It is equipped with
Valve B（7）；
Aerator A（4）, it is set to the aerating wastewater settling tank（3）It is interior, the aerator A（4）It is aerated branch with flue gas
A（22）One end connection, flue gas aeration branch A（22）It is equipped with valve F（23）；
Online pH monitors A（5）, it is set to aerating wastewater settling tank（3）It is interior；
PH regulating reservoirs（10）, input terminal and the softening wastewater supernatant fluid pipeline（8）The other end connection, the pH regulating reservoirs
（10）Output end and pH regulating reservoir discharge pipe lines（13）One end connection, the pH regulating reservoirs discharge pipe line（13）It is equipped with valve
Door D（14）；
Aerator B（11）, it is set to the pH regulating reservoirs（10）It is interior, the aerator B（11）With flue gas aeration branch B
（24）One end connection, flue gas aeration branch B（24）It is equipped with valve G（25）；
Online pH monitors B（12）, it is set to the pH regulating reservoirs（10）It is interior；
Air blower（21）, one end and flue gas aerating pipelines（20）One end connection, the air blower（21）The other end difference
With flue gas aeration branch A（22）The other end, flue gas aeration branch B（24）The other end connection；
Flue gas heat-exchange unit（16）, top and power plant's smoke-exhaust pipeline（15）Connection, the flue gas heat-exchange unit（16）Bottom end and drop
Warm flue gas main pipe rail（17）One end connection, the cooling flue gas main pipe rail（17）The other end respectively with the flue gas aeration tube
Road（20）The other end, cooling smoke overflow pipeline（18）One end connection, the cooling smoke overflow pipeline（18）It is equipped with
Valve E（19）, the flue gas heat-exchange unit（16）Head end and pH regulating reservoir discharge pipe lines（13）The other end connection, the flue gas
Heat exchanger（16）End connect with heat exchanger outlet pipeline；
Automatic control device, with the online pH monitors A（5）, the online pH monitors B（12）, the valve A（2）、
The valve B（7）, the valve C（9）, the valve D（14）, the valve E（19）, the valve F（23）, the valve G
（25）, the air blower（21）Connection, the automatic control device is according to the online pH monitors A（5）With the online pH
Monitor B（12）Monitoring result, control the valve A（2）, the valve B（7）, the valve C（9）, the valve D
（14）, the valve E（19）, the valve F（23）, the valve G（25）With the air blower（21）Switch；
Wherein, the aerating wastewater settling tank（3）For infundibulate wide at the top and narrow at the bottom；
The aerator A（4）With the aerator B（11）It is respectively arranged on the aerating wastewater settling tank（3）With the pH
Regulating reservoir（10）Internal bottom end or top.
2. a kind of desulfurization wastewater flue gas softening pretreatment unit using desulfurization wastewater flue gas described in claim 1 softens pre- place
Reason method, which is characterized in that this approach includes the following steps：
Step 1, desulfurization wastewater is introduced into the aerating wastewater settling tank（3）, the automatic control device opening valve A
（2）, sodium hydroxide medicament is introduced into the aerating wastewater settling tank（3）, the sodium hydroxide medicament and the desulfurization wastewater are equal
Even mixing, after the pH value of mixed dosing waste water is adjusted to 12.5 ~ 14, the automatic control device closes the valve A
（2）；
Step 2, step 1 complete 5 ~ after forty minutes, the automatic control device opens the air blower（21）With the valve F
（23）, cooling flue gas is introduced into the aerating wastewater settling tank（3）；
Meanwhile the online pH monitors A（5）Monitor the aerating wastewater settling tank（3）The variation of middle pH value, when the waste water
It is aerated settling tank（3）When the pH value of middle dosing waste water is reduced to 10.5 ~ 12.5, the automatic control device closes the valve
F（23）With the air blower（21）, stop being aerated and make the aerating wastewater settling tank（3）In dosing waste water start to settle；
Step 3, step 2 complete 5 ~ after forty minutes, the automatic control device opens the valve C（9）, aerating wastewater is sunk
It drops pond supernatant and introduces the pH regulating reservoirs（10）Afterwards, the automatic control device closes the valve C（9）, and described in opening
Valve B（7）So that sludge is from the aerating wastewater settling tank（3）The sludge sewage draining exit of bottom is discharged, after sludge is drained, institute
It states automatic control device and closes the valve B（7）；
Meanwhile the automatic control device opens the valve G（25）With the air blower（21）, start to be aerated, at this point, described
Online pH monitors B（12）Monitor the pH regulating reservoirs（10）The variation of middle pH value, when the pH regulating reservoirs（10）Interior supernatant
PH value when being reduced to 5 ~ 8, the automatic control device closes the valve G（25）With the air blower（21）；
Step 4, the automatic control device opens the valve D（14）, the supernatant after flue gas is acidified is introduced into the cigarette
Gas heat exchanger（16）；
Meanwhile high-temperature flue gas is introduced into the flue gas heat-exchange unit（16）, which flows through the flue gas heat-exchange unit（16）Heating
After be discharged.
3. desulfurization wastewater flue gas according to claim 2 softens preprocess method, which is characterized in that in step 1, desulfurization is useless
Water introduces the aerating wastewater settling tank under the effect of gravity（3）.
4. desulfurization wastewater flue gas according to claim 2 softens preprocess method, which is characterized in that in step 1, the hydrogen
Sodium oxide molybdena medicament is the sodium hydroxide solution that mass concentration is 1% ~ 40%.
5. desulfurization wastewater flue gas according to claim 2 softens preprocess method, which is characterized in that the cooling flue gas is total
Pipeline（17）Middle cooling flue-gas temperature is 25 ~ 60 DEG C.
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