CN205676177U - A kind of bypass flue gas fluidization desulfurization wastewater drying system - Google Patents

A kind of bypass flue gas fluidization desulfurization wastewater drying system Download PDF

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Publication number
CN205676177U
CN205676177U CN201620650182.1U CN201620650182U CN205676177U CN 205676177 U CN205676177 U CN 205676177U CN 201620650182 U CN201620650182 U CN 201620650182U CN 205676177 U CN205676177 U CN 205676177U
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flue
desulfurization wastewater
flue gas
bypass
gas
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董勇
李玉忠
崔琳
张立强
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Shandong Energy Technology Co Ltd
Shandong University
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Shandong Energy Technology Co Ltd
Shandong University
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Abstract

The utility model discloses a kind of bypass flue gas fluidization desulfurization wastewater drying system, including bypass flue gas draws flue, desulfurization wastewater storage tank, desulfurization wastewater pipeline, water pump, air compressor, compressed air piping, atomizer, fluidized drying tower, bypass flue gas loopback flue;Described system is parallel to the original flue collector of boiler, and position in parallel is on boiler main flue on the flue between the flue before air preheater and low-level (stack-gas) economizer and electrostatic precipitator;The utility model can realize desulfurization wastewater zero-emission by being dried evaporation mode, the notable and then cost of disposal that reduces desulfurization wastewater zero-emission;Avoid flue collector internal cause desciccate to bond and then block the risk of flue, it is ensured that the safe operation of boiler.

Description

A kind of bypass flue gas fluidization desulfurization wastewater drying system
Technical field
The utility model belongs to environmental pollution prevention and control and clean coal technology field, bypasses flue gas fluidization particularly to one Desulfurization wastewater drying system.
Background technology
Wet desulfurization of flue gas by limestone-gypsum method technique (WFGD) is the means of flue gas desulfurization of power plant skill being most widely used at present Art, in wet method fume desulfurizing system running, as desulfurization slurry repeatedly circulates and contact flue gas, chlorion is starched in desulfurization Constantly being enriched with in liquid, concentration gradually steps up, when the chlorine ion concentration enrichment in desulfurization slurry reaches about 20g/L, in order to keep away Exempting from corrosion, desulfurization slurry must be discharged away from desulphurization system continuously, and supplement fresh slurry to desulphurization system.These are discharged and leave The slurries of desulphurization system, the water being discharged after removing desulfurated plaster therein is referred to as desulfurization wastewater, containing greatly in desulfurization wastewater The calcium ion of amount, sulfate ion and chlorion.In addition, desulfurization wastewater has acid big, heavy metal ion and suspension contain Amount high, needs could discharge through complicated chemical treatment.Current desulfurization wastewater is processed has processing cost height, discharge Cause secondary pollution problems.Therefore developing low-cost desulfurization wastewater zero-discharge technology is needed.
Main technique and disposal method that current existing desulfurization wastewater is processed include:
(1) utilize fume afterheat to process desulfurization wastewater method, in flue, i.e. spray desulfurization wastewater, utilize flue gas heat to make It evaporates completely, and the villaumite crystallization in desulfurization wastewater becomes solid particle and is deposited in flue gas, and then is trapped by deduster, from cigarette Gas separates.Owing to desciccate containing calcium chloride, easy-adhesion on downstream heat exchanger (such as air preheater) surface, owing to changing Exhaust gases passes between the tube bank of hot device is narrow, and the bur of accumulation easily causes flue blockage, affects the safe operation of generating set, Application is made to be restricted.
(2) " pretreatment-evaporate-crystallization " technique, i.e. uses and is concentrated by evaporation or after film concentration desulfurization wastewater, then use crystallization Device realizes villaumite Crystallization Separation from waste water.The method investment and operating cost are higher, and the solid purity salt reclaiming is not high, combine Close utilization power bad.
(3) being mutually combined of the techniques such as multiple-effect evaporation, mechanical steam compression evaporating, reverse osmosis concentration, positive osmosis concentration.Deposit In the bigger problem of investment and performance driving economy gap.
(4) the natural evaporation method such as coal yard, ash field sprinkling.The method easily causes the facility corrosion of coal yard ash field, as penetrated into Under cause underground water pollution;Coal yard spray pattern makes villaumite still at power plant's circulating enrichment, is efficiently separated;In addition, Natural evaporation method is bigger by weather influence.
(5) desulfurization wastewater is used for wet slag removal system.The method easily causes the corrosion of slag removal equipment, and reduces the synthesis of slag Utilize quality.
Chinese patent 201510643286.X discloses a kind of coal fired power plant flue gas desulfurization Waste Water Treatment, and waste water evaporates Air inlet one tunnel of tower connects with the smoke discharging pipe of boiler through blower fan, magnetic valve successively, and another road is through blower fan and air preheater And the flue connection between electric cleaner, the top of waste water evaporating column arranges nozzle, and the sprinkling direction of nozzle is downward, should Patent there is the problem that for providing the flue gas of evaporating column heat to need to introduce with blower fan, uses blower fan to need power, in order to Make full use of the flue gas entering evaporating column, need to control accurately at any time switch or the wind speed of blower fan, in-convenience in use.Nozzle sets Putting the top at evaporating column, and downward spraying liquid, the drying effect of flue gas is bad, and the flue gas after cooling may be made to carry necessarily The droplet of amount, the flue gas carrying droplet enters device on flue collector damage flue collector.Comprehensive above technical background is low in order to realize Cost, high efficiency desulfurization wastewater zero-emission purpose, it is necessary to find new process technique.
Utility model content
The purpose of this utility model is contemplated to provide a kind of bypass flue gas fluidization desulfurization wastewater drying system, solves to ask One of topic: need when utilizing the flue gas in flue to use blower fan to suck flue gas;The two of problem: the flue gas after cooling may carry one Quantitative droplet is sent back to flue main pipeline, damages the device on flue collector;The three of problem: in flue, the evaporation of spray desulfurization wastewater is dry In drying process, product chlorinated calcium is easy-adhesion causes flue blockage in Tube Sheet of Heat Exchanger interfascicular.
To achieve these goals, the utility model adopts the following technical scheme that
A kind of bypass flue gas fluidization desulfurization wastewater drying system, including bypass flue gas extraction flue, desulfurization wastewater storage tank, Desulfurization wastewater pipeline, water pump, air compressor, compressed air piping, atomizer, fluidized drying tower, bypass flue gas loopback Flue;
Described system is parallel to boiler original boiler main flue, and position in parallel is on boiler main flue before air preheater Flue and low-level (stack-gas) economizer and electrostatic precipitator between flue on;
One end that described bypass flue gas draws flue is connected with the flue before air preheater on boiler main flue, described side The other end that road flue gas draws flue is connected with fluidized drying tower bottom, is provided with atomizer in described fluidized drying tower, Atomizer passes through the water pump outside desulfurization wastewater pipeline and compressed air piping and fluidized drying tower and air compressor respectively Being connected, described water pump is connected with desulfurization wastewater storage tank by desulfurization wastewater pipeline, and fluidized drying tower top is returned with bypass flue gas The one end sending flue connects, the other end of bypass flue gas loopback flue and low-level (stack-gas) economizer and electrostatic precipitator on boiler main flue Between flue connect;
Described bypass flue gas is drawn and is arranged the first lock gate hatch on flue, and described bypass flue gas loopback flue arranges wind adjustable Door, described adjustable ventilation door the second lock gate hatch disposed behind;Described atomizer is arranged on the bottom of described fluidized drying tower, institute State the direction of atomizer upwards.
Preferably: before the atomization nozzle of above-mentioned fluidized drying tower, be sequentially provided with Venturi tube.
Preferably: above-mentioned fluidized drying tower bottom is connected with Pneumatic ash conveying pump.
Preferably: above-mentioned Pneumatic ash conveying pump is connected with bulk cement storage tank.
Preferably: the flue-gas temperature entering into bypass flue gas fluidization desulfurization wastewater drying system is 300-400 DEG C, leaves this The flue-gas temperature of system is 90-100 DEG C.
Preferably: the bypass exhaust gas volumn entering into bypass flue gas fluidization desulfurization wastewater drying system accounts for the whole exhaust gas volumn of boiler 5-10%.
Preferably: flowing velocity in above-mentioned fluidized drying tower for the flue gas is 3-20m/s.
The beneficial effects of the utility model are, bypass flue gas fluidization desulfurization wastewater drying system of the present utility model, profit Carrying out fluidization evaporation drying with high-temperature flue gas to desulfurization wastewater, high-temperature flue gas thermal capacitance is high, and fluidized drying mass transfer effect is good, makes Drying efficiency is high, the time is short, reduce drying tower design height, and then reduce cost;Use fluidized drying method, can make big Partially dried product is discharged at fluidized drying tower bottom, it is to avoid the adhesion to follow-up flue for the calcium chloride in desciccate blocks Risk;Use bypass high temperature flue gas drying pattern so that the flue gas carrying a small amount of desciccate gets around air preheater, low temperature saves The heat exchangers such as coal device, it is to avoid the risk of flue occurs because desciccate is bonded in the slype of heat exchanger to block;Use other Road flue gas drying system can be isolated with flue collector off-the-line as required at any time, realizes desulfurization wastewater zero-emission by being dried evaporation mode Put, the notable and then cost of disposal that reduces desulfurization wastewater zero-emission, it is to avoid flue collector internal cause desciccate bonding and then blocking cigarette The risk in road, it is ensured that the safe operation of boiler.
Inventor of the present utility model finds under study for action, by giving up bypass flue gas fluidization desulfurization of the present utility model Hydrolysing/drying system is parallel to be on boiler main flue between the flue before air preheater and low-level (stack-gas) economizer and electrostatic precipitator Flue on, make use of air preheater and the low-level (stack-gas) economizer drag effect to flue gas, make on flue collector before air preheater The high-temperature flue gas automatic shunt in face is in bypass drying system, it is to avoid the problem using blower fan at air inlet, and according to need Wanting to be regulated at any time the flow velocity of bypass flue gas by air door, atomizer is arranged on the bottom of fluidized drying tower, nozzle Direction is upwards, and the liquid of ejection is long at fluidized drying dwell time in the tower, and the time being dried is long, and fluidized drying tower is also It is connected with one section of bypass flue gas loopback flue, it is ensured that the flue gas in bypath system enters back into flue collector after being sufficiently dried.
Brief description
Fig. 1 is the utility model structural representation;
Wherein, the 1st, bypass flue gas and draw flue, the 2nd, the first lock gate hatch, the 3rd, desulfurization wastewater storage tank, the 4th, desulfurization wastewater pipeline, the 5th, Water pump, the 6th, air compressor, the 7th, compressed air piping, the 8th, atomizer, the 9th, fluidized drying tower, the 10th, adjustable ventilation door, the 11st, literary composition Venturi, the 12nd, the second lock gate hatch, the 13rd, Pneumatic ash conveying pump, the 14th, bulk cement storage tank, the 15th, bypass flue gas loopback flue, the 16th, air preheat Device, the 17th, boiler main flue, the 18th, low-level (stack-gas) economizer, the 19th, electrostatic precipitator.
Detailed description of the invention
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.
Such as Fig. 1, bypass flue gas fluidization desulfurization wastewater drying system of the present utility model, comprising: bypass flue gas draws cigarette Road 1, the first lock gate hatch 2, desulfurization wastewater storage tank 3, desulfurization wastewater pipeline 4, water pump 5, air compressor 6, compressed air piping 7, Atomizer 8, fluidized drying tower 9, adjustable ventilation door 10, Venturi tube 11, the second lock gate hatch 12, Pneumatic ash conveying pump 13, storage ash Tank 14, bypasses flue gas loopback flue 15;This system is parallel to boiler original boiler main flue 17, and position in parallel is boiler main cigarette On road 17 on the flue before air preheater 16 and the flue between low-level (stack-gas) economizer 18 and electrostatic precipitator 19, described bypass cigarette One end that gas draws flue 1 is connected with the flue before air preheater 16 on boiler main flue 17, and described bypass flue gas draws cigarette The other end in road 1 is connected with fluidized drying tower 9 bottom, and described bypass flue gas is drawn and arranged the first lock gate hatch 2, institute on flue 1 Being sequentially provided with Venturi tube 11 and atomizer 8 in stating fluidized drying tower 9, described atomizer 8 is arranged on described fluidization The bottom of drying tower 9, upwards, atomizer 8 is respectively by desulfurization wastewater pipeline 4 and compression sky in the direction of described atomizer 8 Feed channel 7 with fluidized drying tower 9 outside water pump 5 and air compressor 6 be connected, described water pump 5 by desulfurization wastewater pipeline 4 with Desulfurization wastewater storage tank 3 connects, and described fluidized drying tower 9 top is connected with bypass flue gas loopback flue 15 one end, bypasses flue gas The other end of loopback flue 15 is connected with the flue between low-level (stack-gas) economizer 18 with electrostatic precipitator 19 on boiler main flue 17, other Adjustable ventilation door 10 and the second lock gate hatch 12, fluidized drying tower bottom 9 and pneumatic transporting is set gradually on road flue gas loopback flue 15 Ash pump 13 connects, and Pneumatic ash conveying pump 13 is connected with bulk cement storage tank 14.
Bypass flue gas fluidization desulfurization wastewater drying system of the present utility model is in parallel with boiler main flue, and this system is in parallel In boiler original boiler main flue 17, position in parallel is that on boiler main flue 17, the flue before air preheater 16 and low temperature save On flue between coal device 18 and electrostatic precipitator 19, when this system puts into operation, the first lock gate hatch 2 and the second lock gate hatch 12 It is in opening.Boiler smoke flue before air preheater 16 from boiler main flue 17 flows through, fraction cigarette therein Gas flows through the first lock gate hatch 2 through bypass flue gas extraction flue 1 and enters in fluidized drying tower 9, and Venturi tube 11 makes flue gas uniform Distribution, the desulfurization wastewater in desulfurization wastewater storage tank 3 is extracted out, and is sent into fluidized drying tower 9 through desulfurization wastewater pipeline 4 by water pump 5 In interior atomizer 8, air compressor 6 is sent into compressed air in atomizer 8 by compressed air piping 7.Atomization spray The desulfurization wastewater drop of mouth 8 ejection is by flue gas in fluidized drying tower 9, and desulfurization wastewater drop evaporates, is dried, and desulfurization is given up The desciccate of water is deposited in flue gas in granular form, is making through atomizing spray, fluidization etc. together with the flue dust in flue gas Under with, in most of desciccate particle of desulfurization wastewater and flue gas, original flue dust is in chain reunion, the effect of surface adhesion Under, in fluidized drying tower 9, realizing that fluidization granulation is grown up, larger particles drops in Pneumatic ash conveying pump 13, and is transferred to In bulk cement storage tank 14.Fraction desulfurization wastewater desciccate particle is deposited in flue gas entrance bypass flue gas loopback flue 15, successively Flow through adjustable ventilation door 10 and the second lock gate hatch 12, and on flue gas loopback flue 15 and boiler main flue 17 low-level (stack-gas) economizer 18 with The junction of the flue between electrostatic precipitator 19, converges entrance electrostatic precipitator 19, these desciccate particles with main flue gas Removed by electrostatic precipitator 19.
When this bypass flue gas fluidized drying desulfurization wastewater system is out of service, the first lock gate hatch 2 and the second lock gate hatch 12 are closed, and whole flue gases of boiler flow through in boiler main flue, and none-disk terminal flue gas flows through this system.
Although detailed description of the invention of the present utility model is described by the above-mentioned accompanying drawing that combines, but not new to this practicality The restriction of type protection domain, one of ordinary skill in the art should be understood that on the basis of the technical solution of the utility model, ability Field technique personnel do not need to pay the various modification that creative work can make or deformation still at protection model of the present utility model Within enclosing.

Claims (7)

1. bypass a flue gas fluidization desulfurization wastewater drying system, it is characterized in that: including that bypass flue gas draws flue, desulfurization is given up Water storage tank, desulfurization wastewater pipeline, water pump, air compressor, compressed air piping, atomizer, fluidized drying tower, bypass cigarette Gas loopback flue;
Described system is parallel to boiler original boiler main flue, and position in parallel is the cigarette before air preheater on boiler main flue On flue between road and low-level (stack-gas) economizer and electrostatic precipitator;
One end that described bypass flue gas draws flue is connected with the flue before air preheater on boiler main flue, described bypass cigarette The other end that gas draws flue is connected with fluidized drying tower bottom, is provided with atomizer in described fluidized drying tower, described Atomizer passes through the water pump outside desulfurization wastewater pipeline and compressed air piping and fluidized drying tower and air compressor respectively Being connected, described water pump is connected with desulfurization wastewater storage tank by desulfurization wastewater pipeline, and fluidized drying tower top is returned with bypass flue gas The one end sending flue connects, the other end of bypass flue gas loopback flue and low-level (stack-gas) economizer and electrostatic precipitator on boiler main flue Between flue connect;
Described bypass flue gas is drawn and is arranged the first lock gate hatch on flue, and described bypass flue gas loopback flue arranges adjustable ventilation door, Described adjustable ventilation door the second lock gate hatch disposed behind;Described atomizer is arranged on the bottom of described fluidized drying tower, described The direction of atomizer is upwards.
2. bypass flue gas fluidization desulfurization wastewater drying system as claimed in claim 1, is characterized in that: described fluidized drying It is sequentially provided with Venturi tube before the atomization nozzle of tower.
3. bypass flue gas fluidization desulfurization wastewater drying system as claimed in claim 1, is characterized in that: described fluidized drying Tower bottom is connected with Pneumatic ash conveying pump.
4. bypass flue gas fluidization desulfurization wastewater drying system as claimed in claim 3, is characterized in that: described Pneumatic ash conveying pump It is connected with bulk cement storage tank.
5. bypass flue gas fluidization desulfurization wastewater drying system as claimed in claim 1, is characterized in that: enter into bypass flue gas The flue-gas temperature of fluidization desulfurization wastewater drying system is 300-400 DEG C, and the flue-gas temperature leaving this system is 90-100 DEG C.
6. bypass flue gas fluidization desulfurization wastewater drying system as claimed in claim 1, is characterized in that: enter into bypass flue gas The bypass exhaust gas volumn of fluidization desulfurization wastewater drying system accounts for the 5-10% of the whole exhaust gas volumn of boiler.
7. bypass flue gas fluidization desulfurization wastewater drying system as claimed in claim 1, is characterized in that: flue gas is in described fluidised form The flowing velocity changed in drying tower is 3-20m/s.
CN201620650182.1U 2016-06-24 2016-06-24 A kind of bypass flue gas fluidization desulfurization wastewater drying system Active CN205676177U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106477794A (en) * 2016-11-16 2017-03-08 重庆大学 Desulfurization wastewater concentration and the System and method for of flue gas drying integrated treatment
CN106745436A (en) * 2017-02-28 2017-05-31 山东大学 A kind of utilization low temperature bypass flue gas concentrates the system and method for brine waste
CN106986401A (en) * 2017-04-27 2017-07-28 张玉君 A kind of method for treating desulfurized wastewater
CN107162305A (en) * 2017-07-07 2017-09-15 金川集团股份有限公司 A kind of acid waste water processing unit and its application method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106477794A (en) * 2016-11-16 2017-03-08 重庆大学 Desulfurization wastewater concentration and the System and method for of flue gas drying integrated treatment
CN106477794B (en) * 2016-11-16 2019-04-30 重庆大学 The System and method for of desulfurization wastewater concentration and flue gas drying integrated treatment
CN106745436A (en) * 2017-02-28 2017-05-31 山东大学 A kind of utilization low temperature bypass flue gas concentrates the system and method for brine waste
CN106986401A (en) * 2017-04-27 2017-07-28 张玉君 A kind of method for treating desulfurized wastewater
CN107162305A (en) * 2017-07-07 2017-09-15 金川集团股份有限公司 A kind of acid waste water processing unit and its application method

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