CN206384875U - A kind of low-temp low-pressure desulfurization wastewater evaporating - Google Patents
A kind of low-temp low-pressure desulfurization wastewater evaporating Download PDFInfo
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Abstract
The utility model is related to a kind of low-temp low-pressure desulfurization wastewater evaporating, and the device includes flue gas processing system and evaporation and crystallization system；Wherein in evaporation and crystallization system, heated up using flue gas after deduster for recycling waste water, include high pressure atomizing nozzle and gas washer in evaporator, the waste water and cleaning steam being respectively used to after atomization heating, produce and wastewater supernatant fluid condensation is utilized after steam, the mud of evaporation and concentration sprays into air preheater rear pass, is evaporated crystallization and is removed by deduster.Device of the present utility model can be used for the purified treatment of power plant desulfurization wastewater and similar sewage disposal.Involved flash conditions are low temperature, corrosion of the waste water to vapo(u)rization system is greatly reduced, equipment scaling slagging is effectively prevented, energy utilization rate is improved using flue gas processing system, final product has reached salt, water separation, realizes desulfurization wastewater zero-emission.
Description
Technical field
The utility model belongs to technical field of water pollution control, and in particular to a kind of low-temp low-pressure desulfurization wastewater evaporation process
Device.
Background technology
Limestone-gypsum method flue gas desulfurization technology is the desulfurizing industrial fume technology being most widely used at present, the process
The desulfurization wastewater of generation is most intractable to turn into power plant the characteristics of its salt content is high, water quality is in acid and heavy metal severe overweight
Waste water.Conventional desulfuration waste water treatment process mainly includes neutralizing, flocculates, precipitates and outer row at present；But its plant area face
Product is big, investment is high, and technological process is complicated, and the desulfurization wastewater after often handling is not still up to standard.And the desulfurization developed in recent years is given up
Water new technology, such as film process, flue spraying, MED (multiple-effect evaporation crystallization processes), although the recycling to waste water rises necessarily
Effect, but problem is still more, and it is serious that phenomenon is blocked up in such as dirt of film process, need to frequently change filter membrane；Flue spraying treatment amount is small, holds
Corrosion easily is produced to flue and deduster；The problems such as MED evaporation treatment process then has easy fouling, consumes energy high.
With running down for water resource, the pay attention to day by day of Environmental protection, " zero-emission " turns into the target chased.
Waste water zero emission is defined as industrial and mining enterprises not to any waste water of environmental emission, industrial wastewater fully recovering.And power plant will realize
" zero-emission ", main difficult point is then the processing of desulfurization wastewater.The features such as desulfurization wastewater has high salinity, high rigidity, " zero-emission
Put " difficulty is high, include at this stage the problem of power plant desulfurization wastewater " zero-emission " technique urgent need to resolve it is following some：
(1) how the solid water in waste water to be separated, directly obtains the water of recoverable.
(2) such as how less energy resource consumption handles waste water, reduces operating cost.
(3) how equipment scaling is reduced, it is ensured that the cycle of operation of equipment and safety.
Utility model content
The purpose of this utility model is to provide a kind of low-temp low-pressure desulfurization wastewater evaporating, to reduce processing procedure
Energy resource consumption so that reduce processing desulfurization wastewater operating cost, realize the quick processing of desulfurization wastewater.
To achieve the above object, the technical solution adopted in the utility model is：
The flue gas processing system includes air preheater, deduster and desulfurizing tower.
The evaporation and crystallization system includes evaporator, sludge pump one, heater, high pressure atomizing nozzle, gas washer, vacuum
Pump, condenser, draining pump, residue extraction mechanism, sludge pump two, water storage apparatus, feed pump and atomizer, wherein gas washer include removing
Mist plate, sieve plate pipeline, sieve plate, supply line and flushing line.
Water storage apparatus supernatant outlet in the evaporation and crystallization system connects entrance of water-supplying pump by the road；The feed pump
Outlet connects condenser tube-side inlet by the road；The condenser tube side outlet connects evaporator tank body by the road；The evaporation
Device tank body connects the entrance of sludge pump one by the road；The sludge pump one exports connection heater tube-side inlet by the road；It is described to add
Hot device tube side outlet connects high pressure atomizing nozzle by the road；The heater shell side inlet connects deduster rear pass point by the road
Branch；The heater shell-side outlet connects deduster rear pass branch by the road；The high pressure atomizing nozzle is placed in evaporator tank
Internal portion；The gas washer main body connects evaporator tank body through flange；The gas washer steam (vapor) outlet connects condenser by the road
Shell side inlet；The condenser shell-side outlet connects draining pump intake by the road；The vavuum pump bleeding point connects cold by the road
Condenser incoagulable gas outlet；The evaporator deslagging outlet connects residue extraction mechanism entrance by the road；The residue extraction mechanism goes out
Mouth connects the entrance of sludge pump two by the road；The sludge pump two is exported connects atomizer by the road；The atomizer arrangement
Inside air preheater rear pass.
Preferably, be spaced apart successively from the bottom to top inside gas washer in the evaporation and crystallization system four pieces of sieve plates and
One block of demisting plate；Wherein sieve plate pipeline is fixed on sieve plate.
Preferably, the water storage apparatus in the evaporation and crystallization system is water tank.
At the same time, to achieve the above object, the utility model provides a kind of low-temp low-pressure desulfurization wastewater evaporation process
Technique, comprises the following steps：
1) deduster dedusting is entered after flue gas reclaims used heat through air preheater, the flue gas after dedusting is de- into desulfurizing tower
Sulphur, produces desulfurization wastewater；
2) the desulfurization wastewater stoste for producing desulfurizing tower injects water storage apparatus, after settlement, takes on the waste water of water storage apparatus
Clear liquid injects condenser tube side through feed pump, and low pressure evaporator is injected after steam preheating in condenser tube side, and with evaporation
The desulfurization wastewater with certain temperature is mixed in device；Waste water is extracted out through sludge pump one after mixing turns into highly pressurised liquid, enters back into and adds
The heating of hot device tube side, waste water heating institute calorific requirement comes from fume afterheat after deduster wherein at this, flue gas walk heater shell side with
Waste water in tube side is through row heat exchange；Waste water after heating sprays through high pressure atomizing nozzle to be formed hot waste water droplet and is again introduced into
Flashed in low pressure evaporator, form steam and the drop of non-evaporating completely；The drop of non-evaporating completely then drops back into evaporator
On liquid level, and steam then removes tiny salt by sieve plate plate hole layer by layer, gas washing water and demisting plate from the bottom to top through gas washer
Grain and droplet, form clean steam, then enter condenser shell side through gas washer steam (vapor) outlet, and wherein gas washing water is from top to bottom passed through
Sieve plate pipeline is flowed into evaporator, and wherein flushing line is periodically turned on, and supply line is persistently opened；The condensed device shell of clean steam
Journey, with condenser tube side wastewater supernatant fluid heat-shift, condensation forms condensed water, then is discharged by draining pump for power plant's reuse,
And incoagulable gas is then drained to maintain the vacuum of whole evaporation and crystallization system by vacuum pumped in condenser；Work as evaporator
When interior sludge concentration reaches setting value, stop being evaporated in vacuo, base of evaporator sludge is discharged by residue extraction mechanism, taken out through sludge pump two
Go out, the flue sprayed into by atomizer behind air preheater is evaporated, and forms steam and salt particle, and steam is discharged with flue gas, salt
Particle is then removed by deduster.
Preferably, the step 2) in after deduster the temperature range of flue gas meet 100~150 DEG C, connect heater
The deduster rear pass branch of shell-side outlet pipeline is located at after the deduster rear pass branch of connection heater shell side entrance pipe
2~the 4m in face.
Preferably, the step 2) in the heat transfer type of flue gas in heater and waste water be countercurrent heat-transfer；Condenser
In wastewater supernatant fluid and steam heat transfer type be countercurrent heat-transfer, heater shell side smear teflon coating.
Preferably, the step 2) in the temperature range of evaporator meet 45-55 DEG C, vacuum pressure range is met
0.0095-0.0158MPa。
Preferably, the step 2) in evaporator the overall density of waste water maintain 45-55%.
Preferably, the step 2) on gas washer sieve plate gas washing water be that saturation clear water and thickness at 45-55 DEG C is
1-4mm。
Preferably, the step 2) in gas washer sieve plate length of pipe be gas washer total height 1/6th (1/
6)。
The beneficial effects of the utility model are：
1) evaporated using low-temperature condition, reduce corrosivity of the waste water to equipment, it is to avoid equipment scaling, while to utilize
Low-temperature heat source provides facility；Evaporator tank body is slack tank body, and internal gas washer uses layered arrangement, and layer is carried out to the steam of extraction
Layer washing, can control condensed water water quality, to realize the up to standard of water quality by adjusting suction pressure.
2) use flue gas after deduster to provide energy for waste water evaporation, make use of low temperature exhaust heat, removed while avoiding and utilizing
Situation of the dust to heater serious wear after flue gas before dirt device；Heater shell side smears polytetrafluoroethylene (PTFE), prevents flue gas corrosion
Heater；Steam condenser heat heated waste water is utilized in condenser, capacity usage ratio is improved.
3) it is evaporated using by highly enriched desulfurization wastewater penetrating flue, reduces flue waste water evaporation capacity, it is to avoid useless
Corrosion of the water evaporation not exclusively to flue and deduster, while realizing that salt solution is separated, reaches desulfurization wastewater zero-emission.
Brief description of the drawings
The structural representation for the low-temp low-pressure desulfurization wastewater evaporating that Fig. 1 provides for the utility model；
Wherein, 11, air preheater；12nd, deduster；13rd, desulfurizing tower；20th, evaporator；21st, sludge pump one；22nd, heat
Device；23rd, high pressure atomizing nozzle；24th, gas washer；25th, vavuum pump；26th, condenser；27th, draining pump；28th, residue extraction mechanism；29th, it is dirty
Dredge pump two；30 water storage apparatus；31st, feed pump；32nd, atomizer.
The structural representation inside gas washer 24 that Fig. 2 provides for the utility model；
Wherein, 41, demisting plate；42nd, sieve plate pipeline；43rd, sieve plate；44th, supply line；45th, flushing line.
Embodiment
Embodiment 1：
Reference picture 1, the low-temp low-pressure desulfurization wastewater evaporating described in the present embodiment, device includes flue gas
Processing system 1 and evaporation and crystallization system 2.
The flue gas processing system 1 includes air preheater 11, deduster 12 and desulfurizing tower 13.
The evaporation and crystallization system 2 includes evaporator 20, sludge pump 1, heater 22, high pressure atomizing nozzle 23, gas washing
Device 24, vavuum pump 25, condenser 26, draining pump 27, residue extraction mechanism 28, sludge pump 2 29, water storage apparatus 30, feed pump 31 and mist
Change nozzle 32, wherein gas washer (such as Fig. 2) 24 includes demisting plate 41, sieve plate pipeline 42, sieve plate 43, supply line 44 and flush pipe
Road 45.
The supernatant outlet of water storage apparatus 30 in the evaporation and crystallization system 2 connects the entrance of feed pump 31 by the road；It is described
Feed pump 31 exports the connection tube-side inlet of condenser 26 by the road；The tube side of condenser 26 outlet connects evaporator 20 by the road
Tank body；The tank body of evaporator 20 connects the entrance of sludge pump 1 by the road；The outlet of sludge pump 1 connection by the road adds
The hot tube-side inlet of device 22；The tube side of heater 22 outlet connects high pressure atomizing nozzle 23 by the road；The shell side of heater 22
Entrance connects the rear pass branch of deduster 12 by the road；The shell-side outlet of heater 22 connects the rear pass of deduster 12 by the road
Branch；The high pressure atomizing nozzle 23 is placed in the tank interior of evaporator 20；The main body of gas washer 24 connects evaporator through flange
20 tank bodies；The steam (vapor) outlet of gas washer 24 connects the shell side inlet of condenser 26 by the road；The shell-side outlet of condenser 26 warp
Pipeline connects the entrance of draining pump 27；The bleeding point of vavuum pump 25 connects the incoagulable gas outlet of condenser 26 by the road；Institute
State the outlet of the deslagging of evaporator 20 and connect the entrance of residue extraction mechanism 28 by the road；The residue extraction mechanism 28 is exported connects sludge pump by the road
2 29 entrances；The outlet of sludge pump 2 29 connects atomizer 32 by the road；The atomizer 32 is arranged in air preheat
Inside the rear pass of device 11.
It is spaced apart four pieces of sieve plates 43 and one piece inside gas washer 24 in the evaporation and crystallization system 2 successively from the bottom to top
Demisting plate 41；Wherein sieve plate pipeline 42 is fixed on sieve plate 43.
Water storage apparatus 30 in the evaporation and crystallization system 2 is water tank.
Low-temp low-pressure desulfurization wastewater evaporation technology described in the present embodiment, is comprised the following steps that：
1) dedusting of deduster 12 is entered after flue gas reclaims used heat through air preheater 11, the flue gas after dedusting enters desulfurizing tower
Desulfurization 13, produces desulfurization wastewater；
2) the desulfurization wastewater stoste for producing desulfurizing tower 13 injects water storage apparatus 30, after settlement, takes water storage apparatus 30
Wastewater supernatant fluid injects the tube side of condenser 26 through feed pump 31, and low pressure evaporation is injected after steam is preheated in the tube side of condenser 26
Device 20, and mixed with the desulfurization wastewater with certain temperature in evaporator 20；Waste water is extracted out through sludge pump 1 and turned into after mixing
Highly pressurised liquid, enters back into the heating of the tube side of heater 22, and waste water heating institute calorific requirement is come from after deduster 12 more than flue gas wherein at this
Heat, flue gas walks the shell side of heater 22 with the waste water in tube side through row heat exchange；Waste water after heating sprays through high pressure atomizing nozzle 23
Go out to be formed hot waste water droplet and be again introduced into low pressure evaporator 20 to be flashed, the drop of formation steam and non-evaporating completely；
The drop of non-evaporating completely is then dropped back on evaporator liquid level, and steam is then through gas washer 24 from the bottom to top by the plate of sieve plate 43 layer by layer
Hole, gas washing water and demisting plate 41 remove tiny salt particle and droplet, clean steam are formed, then through the steam (vapor) outlet of gas washer 24
Into the shell side of condenser 26, wherein gas washing water is flowed into evaporator 20 through sieve plate pipeline 42 under upper, wherein flushing line 45
Periodically turn on, supply line 44 is persistently opened；The condensed shell side of device 26 of clean steam, the wastewater supernatant fluid with the tube side of condenser 26
Heat-shift, condensation forms condensed water, then is discharged by draining pump 27 for power plant's reuse, and incoagulable gas is then in condenser 26
Extracted out and drained to maintain the vacuum of whole evaporation and crystallization system by vavuum pump 25；When sludge concentration reaches setting in evaporator 20
During value, stop being evaporated in vacuo, the base sludge of evaporator 20 is discharged by residue extraction mechanism 28, extracted out through sludge pump 2 29, sprayed by atomization
The flue evaporation that mouth 32 is sprayed into behind air preheater 11, forms steam and salt particle, steam is discharged with flue gas, salt particle then by
Deduster 12 is removed.
Step 2) in after deduster 12 flue-gas temperature be 120 DEG C, connect the deduster 12 of the shell-side outlet pipeline of heater 22
Rear pass branch is located at the 3m behind the rear pass branch of deduster 12 of the connection shell side inlet pipeline of heater 22.
Step 2) in the heat transfer type of flue gas in heater 22 and waste water be countercurrent heat-transfer；On waste water in condenser 26
The heat transfer type of clear liquid and steam is countercurrent heat-transfer, and the shell side of heater 22 smears teflon coating.
Step 2) described in evaporator 20 temperature control at 55 DEG C, vacuum pressure is controlled in 0.0158MPa.
Step 2) described in by crystal seed add evaporator 20 in, be easy in waste water form crystal block.
Step 2) described in evaporator 20 overall density of waste water maintain 50%.
Step 2) described in the upper sieve plate 43 of gas washer 24 plate hole be 3.5mm, gas washing water thickness be 55 DEG C at saturation it is clear
Water and thickness are 2mm.
Step 2) described in the internal diameter 7mm of sieve plate pipeline 42 in gas washer 24, demisting plate 41 is at intervals of 8mm.
Embodiment 2：
Low-temp low-pressure desulfurization wastewater vaporising device used in the present embodiment and above-described embodiment 1 are essentially identical, and distinguish as follows：
Described low-temp low-pressure desulfurization wastewater evaporation technology, is comprised the following steps that：
1) dedusting of deduster 12 is entered after flue gas reclaims used heat through air preheater 11, the flue gas after dedusting enters desulfurizing tower
Desulfurization 13, produces desulfurization wastewater；
2) the desulfurization wastewater stoste for producing desulfurizing tower 13 injects water storage apparatus 30, after settlement, takes water storage apparatus 30
Wastewater supernatant fluid injects the tube side of condenser 26 through feed pump 31, and low pressure evaporation is injected after steam preheating in the tube side of condenser 26
Device 20, and mixed with the desulfurization wastewater with certain temperature in evaporator 20；Waste water is extracted out through sludge pump 1 and turned into after mixing
Highly pressurised liquid, enters back into the heating of the tube side of heater 22, and waste water heating institute calorific requirement is come from after deduster 12 more than flue gas wherein at this
Heat, flue gas walks the shell side of heater 22 with the waste water in tube side through row heat exchange；Waste water after heating sprays through high pressure atomizing nozzle 23
Go out to be formed hot waste water droplet and be again introduced into low pressure evaporator 20 to be flashed, the drop of formation steam and non-evaporating completely；
The drop of non-evaporating completely is then dropped back on evaporator liquid level, and steam is then through gas washer 24 from the bottom to top by the plate of sieve plate 43 layer by layer
Hole, gas washing water and demisting plate 41 remove tiny salt particle and droplet, clean steam are formed, then through the steam (vapor) outlet of gas washer 24
Into the shell side of condenser 26, wherein gas washing water is from top to bottom flowed into evaporator 20 through sieve plate pipeline 42, wherein flushing line 45
Periodically turn on, supply line 44 is persistently opened；The condensed shell side of device 26 of clean steam, is handed over the tube side wastewater supernatant fluid of condenser 26
Heat exchange amount, condensation forms condensed water, then is discharged by draining pump 27 for power plant's reuse, and in condenser 26 incoagulable gas then by
Vavuum pump 25, which is extracted out, drains to maintain the vacuum of whole evaporation and crystallization system；When sludge concentration reaches setting value in evaporator 20
When, stop being evaporated in vacuo, the base sludge of evaporator 20 is discharged by residue extraction mechanism 28, extracted out through sludge pump 2 29, by atomizer
The 32 flues evaporations sprayed into behind air preheaters 11, form steam and salt particle, steam is discharged with flue gas, salt particle then by except
Dirt device 12 is removed.
Step 2) in after deduster 12 flue-gas temperature be 130 DEG C, connect the deduster 12 of the shell-side outlet pipeline of heater 22
Rear pass branch is located at the 3.5m behind the rear pass branch of deduster 12 of the connection shell side inlet pipeline of heater 22.
Step 2) in the heat transfer type of flue gas in heater 22 and waste water be countercurrent heat-transfer；On waste water in condenser 26
The heat transfer type of clear liquid and steam is countercurrent heat-transfer, and the shell side of heater 22 smears teflon coating.
Step 2) described in temperature control in evaporator 20 at 50 DEG C, vacuum pressure is controlled in 0.0124MPa.
Step 2) in by the crystal seed add evaporator 20 in, be easy in waste water form crystal block.
Step 2) described in evaporator 20 overall density of waste water maintain 45%.
Step 2) described in the upper sieve plate 43 of gas washer 24 plate hole be 4mm, gas washing water be 50 DEG C at saturation clear water and thickness
Spend for 4mm.
Step 2) described in the internal diameter 6mm of sieve plate pipeline 42 in gas washer 24, demisting plate 41 is at intervals of 6mm.
It should be understood that above-described embodiment is only to illustrate technical concepts and features of the present utility model, its object is to supply ability
Field technique personnel understand content of the present utility model and implemented according to this, and the not exhaustion of embodiment can not be limited with this
Make protection domain of the present utility model.It is all to be modified according to technical scheme of the present utility model or equivalent substitution, and
The objective and scope of technical solutions of the utility model are not departed from, it all should cover works as in right of the present utility model
In.
Claims (3)
1. a kind of low-temp low-pressure desulfurization wastewater evaporating, the device includes flue gas processing system (1) and evaporation knot
Crystallographic system unites (2).
The flue gas processing system (1) includes air preheater (11), deduster (12) and desulfurizing tower (13)；
The evaporation and crystallization system (2) includes evaporator (20), sludge pump one (21), heater (22), high pressure atomizing nozzle
(23), gas washer (24), vavuum pump (25), condenser (26), draining pump (27), residue extraction mechanism (28), sludge pump two (29), storage
Wetting system (30), feed pump (31) and atomizer (32), wherein gas washer (24) include demisting plate (41), sieve plate pipeline
(42), sieve plate (43), supply line (44) and flushing line (45)；
Water storage apparatus (30) supernatant outlet in the evaporation and crystallization system (2) connects feed pump (31) entrance by the road；Institute
State feed pump (31) outlet and connect condenser (26) tube-side inlet by the road；Condenser (26) the tube side outlet is connected by the road
Evaporator (20) tank body；Evaporator (20) tank body connects sludge pump one (21) entrance by the road；The sludge pump one (21)
Outlet connects heater (22) tube-side inlet by the road；Heater (22) the tube side outlet connects high pressure atomizing nozzle by the road
(23)；Heater (22) shell side inlet connects deduster (12) rear pass branch by the road；Heater (22) shell side
Outlet connects deduster (12) rear pass branch by the road；The high pressure atomizing nozzle (23) is placed in evaporator (20) tank body
Portion；Gas washer (24) main body connects evaporator (20) tank body through flange；Gas washer (24) steam (vapor) outlet connects by the road
Connect condenser (26) shell side inlet；Condenser (26) shell-side outlet connects draining pump (27) entrance by the road；The vacuum
Pump (25) bleeding point connects condenser (26) incoagulable gas outlet by the road；Evaporator (20) the deslagging outlet is by the road
Connect residue extraction mechanism (28) entrance；Residue extraction mechanism (28) outlet connects sludge pump two (29) entrance by the road；The sludge
Pump two (29) outlet connects atomizer (32) by the road；The atomizer (32) is arranged in air preheater (11) rear pass
It is internal.
2. low-temp low-pressure desulfurization wastewater evaporating according to claim 1, it is characterised in that the evaporative crystallization
Four pieces of sieve plates (43) and one piece of demisting plate (41) are spaced apart successively from the bottom to top inside gas washer (24) in system (2)；Its
Middle sieve plate pipeline (42) is fixed on sieve plate (43).
3. low-temp low-pressure desulfurization wastewater evaporating according to claim 1, it is characterised in that the evaporative crystallization
Water storage apparatus (30) in system (2) is water tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621383340.8U CN206384875U (en) | 2016-12-16 | 2016-12-16 | A kind of low-temp low-pressure desulfurization wastewater evaporating |
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| CN201621383340.8U CN206384875U (en) | 2016-12-16 | 2016-12-16 | A kind of low-temp low-pressure desulfurization wastewater evaporating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110240212A (en) * | 2019-07-09 | 2019-09-17 | 青岛达能环保设备股份有限公司 | A kind of waste water evaporation concentration system and technique based on low temperature spray desulfurization |
| CN110272081A (en) * | 2019-07-24 | 2019-09-24 | 北京新世翼节能环保科技股份有限公司 | Desulfurization wastewater zero-emission coupling flue gas takes off white integral system |
-
2016
- 2016-12-16 CN CN201621383340.8U patent/CN206384875U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110240212A (en) * | 2019-07-09 | 2019-09-17 | 青岛达能环保设备股份有限公司 | A kind of waste water evaporation concentration system and technique based on low temperature spray desulfurization |
| CN110272081A (en) * | 2019-07-24 | 2019-09-24 | 北京新世翼节能环保科技股份有限公司 | Desulfurization wastewater zero-emission coupling flue gas takes off white integral system |
| CN110272081B (en) * | 2019-07-24 | 2023-12-22 | 北京新世翼节能环保科技股份有限公司 | Desulfurization wastewater zero release coupling flue gas whitening integrated system |
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