CN205011413U - Coal fired power plant flue gas desulfurization effluent disposal system - Google Patents
Coal fired power plant flue gas desulfurization effluent disposal system Download PDFInfo
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- CN205011413U CN205011413U CN201520773601.6U CN201520773601U CN205011413U CN 205011413 U CN205011413 U CN 205011413U CN 201520773601 U CN201520773601 U CN 201520773601U CN 205011413 U CN205011413 U CN 205011413U
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Abstract
The utility model discloses a coal fired power plant flue gas desulfurization effluent disposal system belongs to the waste water treatment technology field, has increased waste water liquid storage tank, waste water evaporating column, flue gas desulfurization absorption tower exhaust waste water is received to the waste water liquid storage tank, the water inlet of waste water evaporating column passes through the inlet channel and connects the waste water tank, sets up the water pump in the middle of the inlet channel, and in proper order through the exhaust pipe of fan, solenoid valve and boiler intercommunication, another way the flue gas pipeline between fan and air heater and electrostatic precipitator communicate all the way for the air inlet of waste water evaporating column, and intercommunication department is located the one end near air heater, and the flue gas pipeline between its gas vent and air heater and the electrostatic precipitator communicates to be located the one end of being close to electrostatic precipitator. The utility model discloses a waste water is handled to the waste water evaporating column, for useless evaporation of water provides sufficient space, guarantees that waste water has sufficient gas -liquid area of contact and dwell time to make atomized liquid drip abundant evaporation.
Description
Technical field
the utility model belongs to technical field of waste water processing, is specifically related to a kind of coal fired power plant flue gas desulfurization Waste Water Treatment.
Background technology
wet Flue Gas Desulfurization Technology is the flue gas desulfurization technique of the current widespread use in coal-burning power plant, adopt technique desulfurization can produce a certain amount of waste water, this heavy metals content overproof, containing suspended substance and in slightly acidic, direct discharge can cause very large harm to environment, therefore must treated up to standard after could discharge.
existing method for treating desulfurized wastewater has hydraulic flushing ash method, embrane method, fluidized bed process, chemical precipitation method etc., and the method be most widely used in the world is at present chemical precipitation method.The method utilizes independent Waste Water Treatment to carry out chemical treatment to waste water, carries out discharging or recycling after water quality reaches emission standard.The technological process of chemical precipitation method comprises: 1) homogeneous: by stirring, cushioning, the waste water Homogeneous phase mixing making Different periods discharge, stabilizing water quality and the water yield, be beneficial to subsequent disposal; 2) waste water neutralize precipitation: waste water enters neutralization reaction pond, and Xiang Chizhong adds NaOH or Ca(OH)
2
deng alkaline matter, improve wastewater pH, make the Fe in waste water
3+
, Zn
2+
, Cu
2+
, Ni
2+
, Cr
3+
removed etc. most of heavy metal ion, in order to prevent the precipitation generated from reacting generation oxy-compound further, general pH regulates about 9; 3) heavy metal precipitation: add S
2-
or organosulfur, with Hg remaining in waste water
2+
and Pb
2+
reaction generates HgS and PbS precipitation; 4) coagulating treatment: add coagulating agent in waste water remaining carefully small and scattered particle and colloidalmaterial coacervating large particle in waste water are precipitated, by the compression double electric layer effect of coagulating agent, impel heavy metal hydroxide coalescence, precipitation; 5) clarify: the waste water after coagulation enters settling pond, rely on gravity to carry out sedimentation, by clear liquid discharging up to standard for upper strata; 6) dewater to body refuse, press filtration carries out special processing after becoming sludge filter cake.
water quality after chemical precipitation method process can reach higher standard, can fully utilize by-produced gypsum, have good economy, but also there is many shortcomings in this method: 1) investment is larger, need independent chemical medicine system, also need a large amount of chemical agents; 2) system is huge, and maintenance cost is higher; 3) to solvability Cl
-
, F
-
there is no effective minimizing technology, and Cl
-
have very large corrodibility in acid condition, the waste water therefore after process cannot be recycled.
no. CN101844819A, Chinese utility model patent discloses a kind of desulfurization wastewater spray evaporation treatment process, the method is provided with atomizing nozzle in the flue at air preheater (air preheater) rear portion, evaporating in flue after desulfurization wastewater is atomized by atomizing nozzle, then discharges chimney with flue gas.But, because air preheater rear portion flue space is narrow and small, and effective evaporation of waste water needs larger gas liquid interfacial area and certain residence time, therefore desulfurization wastewater usually can not evaporate completely, not only have impact on the treatment effect of waste water, and unevaporated waste water also can cause corrosion to flue and follow-up cleaning apparatus.Another shortcoming of the method to control the flue-gas temperature in the flue of air preheater rear portion, flue-gas temperature may be made after waste water spray evaporation to be reduced to below acid dew point, the acidic substance in flue gas are caused to condense, accelerate the corrosion of flue and follow-up cleaning apparatus, thus add the cost of electricity-generating of wastewater treatment expense and coal-burning power plant, also affect boiler power generation system safety.
Utility model content
the technical problems to be solved in the utility model is to provide a kind of zero release, the coal fired power plant flue gas desulfurization Waste Water Treatment that processing costs is low.
for solving the problems of the technologies described above, technical solution adopted in the utility model is:
a kind of coal fired power plant flue gas desulfurization Waste Water Treatment, comprise air preheater, electric precipitator, fume desulfurating absorption tower, induced draft fan and chimney, described air preheater front end connects boiler exhaust gas pipeline, air preheater rear end and electric precipitator, fume desulfurating absorption tower, connected successively by flue between induced draft fan and chimney, further comprise waste water liquid storage tank, waste water evaporator tower, described waste water liquid storage tank receives the waste water that fume desulfurating absorption tower is discharged, the water-in of described waste water evaporator tower connects waste water tank by inlet channel, in the middle of inlet channel, water pump is set, inlet mouth one tunnel of waste water evaporator tower is successively through blower fan, magnetic valve is communicated with the smoke discharging pipe of boiler, another road is communicated with the flue between air preheater and electric precipitator through blower fan, connectivity part is positioned at the one end near air preheater, its venting port is communicated with the flue between air preheater and electric precipitator, and the one end be positioned near electric precipitator.
further, the flue of described electric precipitator ingress is provided with temperature sensor, and set up flue-gas temperature pilot circuit, described flue-gas temperature pilot circuit comprises micro-chip U1, touch-screen CMP and driving mechanism U2, the communication interface of described touch-screen CMP and micro-chip U1 is bi-directionally connected, the input terminus of described driving mechanism U2 connects the control signal output terminal of micro-chip U1, the temperature data of the direct reading temperature sensor of micro-chip, judge through the built-in discriminating program of micro-chip, export the opening and closing of control signal Controlling solenoid valve, touch-screen CMP is used for the input of parameter and the display of temperature.
preferably, the top of described waste water evaporator tower is provided with two-fluid spray nozzle, and a fluid intake of described two-fluid spray nozzle connects water-in, and another fluid intake connects inlet mouth, and inlet mouth connects high-pressure air source.
preferably, the top of described waste water evaporator tower is provided with rotational flow atomizer, and the import of described rotational flow atomizer connects water-in.
preferably, the bottom of described waste water evaporator tower is provided with ash bucket.
preferably, the inlet mouth of described waste water evaporator tower and venting port are arranged at the bottom of the tower of waste water evaporator tower and tower top respectively, and inlet mouth and vent position can exchange.
owing to adopting technique scheme, the beneficial effect that the utility model produces is:
the utility model, by waste water evaporator tower process waste water, for useless evaporation of water provides enough spaces, ensures that waste water has enough gas liquid interfacial area and the residence time, thus atomizing droplet is fully evaporated.Meanwhile, the utility model adds flue-gas temperature and controls, and the flue-gas temperature of electric precipitator inlet mouth is controlled more than boiler smoke acid dew point, causes corrosion after preventing the acidic substance in flue gas from condensing to flue and follow-up cleaning apparatus.The utility model apparatus structure is simple, with low cost, not only greatly reduces the processing cost of boiler smoke, and achieves the zero release of power plant effluent.
Accompanying drawing explanation
fig. 1 is the process flow diagram of the utility model embodiment 1;
fig. 2 is the process flow diagram of the utility model embodiment 2;
fig. 3 is the utility model temperature detection control circuit schematic diagram;
wherein: 1, boiler, 2, air preheater, 3, electric precipitator, 4, fume desulfurating absorption tower, 5, chimney, 6, gypsum, 7, liquid storage tank, 8, water pump, 9, air compressor machine, 10, waste water evaporator tower, 11, ash bucket, 12, blower fan, 13, temperature sensor, 14, magnetic valve, 15, induced draft fan.
Embodiment
the utility model relates to a kind of coal fired power plant flue gas desulfurization Waste Water Treatment, the utility model is by arranging waste water evaporator tower, flue-gas temperature sensor and flue-gas temperature pilot circuit, desulfurization wastewater is through waste water evaporator tower evaporation process, waste water evaporator tower can ensure that atomizing droplet has the sufficient residence time, waste water evaporator tower is extracting high-temperature flue gas after air preheater or before air preheater, flue-gas temperature is higher, desulfurization wastewater droplet vaporator rate is faster, flue gas after temperature reduces enters flue collector inside and mixes with former high-temperature flue gas, flue-gas temperature pilot circuit can ensure that mixed flue-gas temperature is still higher than acid dew point, effectively prevent the condensation of acid, thus the corrosion to flue and follow-up cleaning apparatus after avoiding desulfurization wastewater evaporation.
principle of work of the present utility model utilizes high-temperature flue gas before air preheater or below to make waste water rapid evaporation, and the steam produced is back to former flue with flue gas, enters thionizer be able to partially recycled through dust-removal system.In waste water in mercurous, the heavy metal such as zinc, lead, nickel and the ash bucket at the bottom of the non-metal contaminants such as arsenic, fluorine portion collection to tower, all the other enter follow-up dust-removal system with the form of dry ash and process, the flying dust that native system is collected is mainly used in cement additire, the heavy metal contained in flying dust is cured in cement products, very little on the impact of environment.
embodiment 1
as shown in Figure 1, the utility model comprises air preheater 2, electric precipitator 3, fume desulfurating absorption tower 4, induced draft fan 15 and chimney 5, described air preheater 2 front end connects the smoke discharging pipe of boiler 1, air preheater 2 rear end and electric precipitator 3, fume desulfurating absorption tower 4, connected successively by flue between induced draft fan 15 and chimney 5, further comprise waste water liquid storage tank 7, waste water evaporator tower 10, described waste water liquid storage tank 7 receives the waste water that fume desulfurating absorption tower 4 is discharged, the water-in of described waste water evaporator tower 10 connects waste water tank 7 by inlet channel, in the middle of inlet channel, water pump 8 is set, inlet mouth one tunnel of waste water evaporator tower 10 is successively through blower fan 12, magnetic valve 14 is communicated with the smoke discharging pipe of boiler, another road is communicated with the flue between air preheater 2 and electric precipitator 4 through blower fan 12, connectivity part is positioned at the one end near air preheater 2, its venting port is communicated with the flue between air preheater 2 and electric precipitator 3, and the one end be positioned near electric precipitator 3.
in order to control flue-gas temperature, ensure to make the flue-gas temperature of electric precipitator inlet mouth higher than the temperature value of boiler smoke acid dew point, prevent the acidic substance in flue gas from condensing, be corroded to avoid flue and follow-up cleaning apparatus, the flue of described electric precipitator ingress is provided with temperature sensor 13, and set up flue-gas temperature pilot circuit (see Fig. 3) wherein driving mechanism U2 employing rly. driving chip, its model is XC2023, touch-screen CMP is used for the input of parameter and the display of temperature, described flue-gas temperature pilot circuit comprises micro-chip U1, touch-screen CMP and driving mechanism U2, the communication interface of described touch-screen CMP and micro-chip U1 is bi-directionally connected, the input terminus of described driving mechanism U2 connects the control signal output terminal of micro-chip U1, the temperature data of the direct reading temperature sensor of micro-chip, judge through the built-in discriminating program of micro-chip, export the opening and closing of control signal Controlling solenoid valve 14.
in order to ensure evaporation effect, the top of described waste water evaporator tower 10 is provided with two-fluid spray nozzle, and a fluid intake of described two-fluid spray nozzle connects water-in, and another fluid intake connects inlet mouth, inlet mouth connects high-pressure air source, and high-pressure air source preferably adopts air compressor machine source of the gas.Described two-fluid spray nozzle can also be replaced with rotational flow atomizer, and the import of described rotational flow atomizer connects water-in.The bottom of described waste water evaporator tower is provided with ash bucket simultaneously, is convenient to the collection and treatment of dust.
working process
when the cigarette temperature after air preheater 2 is enough high, when can ensure that waste water evaporates completely, after boiler 1 tail air preheater 2, temperature range is extract a certain amount of high-temperature flue gas in the flue of 10-15m/s at 423K-453K, flow velocity, and flue gas is entered in waste water evaporator tower 10 by tower top.After the waste water that fume desulfurating absorption tower 4 desulfurization produces is discharged, first carry out processed generating portion gypsum 6, enter subsequently in liquid storage tank 7 and carry out sedimentation pre-treatment, after mixing in certain proportion with the pressurized air that air compressor machine 9 is sent in the two-fluid spray nozzle that supernatant liquid is driven in waste water evaporator tower 10 by water pump 8 afterwards, spray in waste water evaporator tower inside with mist state form, size droplet diameter controls between 50 μm-100 μm, and contact with the high-temperature flue gas in tower and mix, there is strong heat exchange in gas-liquid two-phase, atomizing droplet flash evapn, flue gas after temperature reduces is back in the former flue after air preheater 2 at the bottom of tower, by adjustable spraying amount, flue-gas temperature is controlled more than acid dew point.The steam produced after desulfurization wastewater evaporation is finally with flue gas row outside chimney 5.Atomization process occurs in waste water evaporator tower 10, desulfurization wastewater evaporation after the heavy metal such as mercury, zinc, lead, nickel and the ash bucket 11 of the non-metal contaminants such as arsenic, fluorine portion collection at the bottom of tower in, all the other are back in former flue with the form of dry ash with flue gas, enter in electric precipitator 3 and be removed together with the dust in flue gas.
[illustrate: most flue gas heat is changed away by air preheater (interchanger) when cigarette temperature after air preheater is lower, for boiler auxiliary combustion], when being not enough to waste water is evaporated completely or the flue-gas temperature of electric precipitator inlet mouth cannot be made to remain on acid dew point by adjustable spraying amount, magnetic valve 14 between the inlet mouth of waste water evaporator tower 10 and the smoke outlet of boiler 1 can be opened, extracting after a small amount of high-temperature flue gas mixes with the flue gas after air preheater 2 enters in waste water evaporator tower 10 again, because before air preheater 2, cigarette temperature is higher, only need a small amount of high-temperature flue gas can reach the required cigarette temperature of evaporation.
when boiler normally runs, micro-chip compares according to the flue-gas temperature of the acid dew point (temperature) of input with the electric precipitator ingress detected, the opening and closing of Controlling solenoid valve 14, make the flue-gas temperature of electric precipitator inlet mouth higher than the temperature value of boiler smoke acid dew point, prevent the acidic substance in flue gas from condensing, to avoid flue and follow-up cleaning apparatus to be corroded, reduce the cost of electricity-generating of fume treatment expense and coal-burning power plant.
micro-chip U1 receives the boiler smoke acid dew-point temperature value inputted by operator by touch-screen CMP, and pass through the flue-gas temperature of temperature sensor 13 Real-Time Monitoring electric precipitator inlet mouth, if the flue-gas temperature of electric precipitator inlet mouth is higher than the temperature value of boiler smoke acid dew point, then close the magnetic valve 14 between the inlet mouth of waste water evaporator tower 10 and boiler smoke outlet, the atomization waste water of the rotational flow atomizer in the partial fume heated waste water evaporator tower 10 of being discharged by air preheater 2 or two-fluid spray nozzle ejection; If the flue-gas temperature of electric precipitator inlet mouth is equal to or less than the temperature value of boiler smoke acid dew point, then open the magnetic valve 14 between the inlet mouth of waste water evaporator tower 10 and boiler smoke outlet, the common heating atomization waste water of partial fume that the partial fume of being discharged by boiler 1 and air preheater 2 are discharged.
embodiment 2:
as shown in Figure 2, as different from Example 1, in order to increase the residence time of waste water in waste water evaporator tower 10, waste water is fully evaporated, high-temperature flue gas and waste water atomizing droplet counter current contact in tower.High-temperature flue gas is sailed against the current at the bottom of waste water evaporator tower 10 tower, fully mixing is contacted with atomizing droplet, there is strong heat exchange in gas-liquid two-phase, atomizing droplet flash evapn, and the flue gas after temperature reduces is back in the former flue after air preheater from waste water evaporator tower 10 top.
the utility model waste water evaporator tower 10 not only can process desulfurization wastewater, other high density brackish waters in power plant also can carry out evaporation process in the lump, at this moment waste water evaporator tower 10 will become the terminal process platform of power plant's brackish water, and the application of this technology really achieves the zero release of power plant effluent.
compared with prior art, desulfurization wastewater treatment system of the present utility model has the following advantages:
1) waste water evaporative phase-change promotes Combustion Source PM2.5 coalescence, be convenient to electric electric precipitator and WFGD(wet process of FGD) system is to the seizure of PM2.5 and remove, waste water adds the humidity of flue gas after evaporating in waste water evaporator tower, reduce the ratio resistance of dust, the efficiency of dust collection of electric precipitator can be improved;
2) reduce wet flue gas desulfurization absorption tower entrance flue gas temperature, reduce the vaporize water consumption of absorption tower desulfurization slurry, reduce process water and supplement;
3) eliminate the treating processes of existing desulfurization wastewater bulky complex, achieve the zero release of waste water, save a large amount of working costs and resource, reduce the cost of generating;
4) because flue-gas temperature reduces, therefore flue gas specific volume reduces, and induced draft fan acting reduces, thus effectively reduces induced draft fan power consumption;
5) due to discharge after desulfurization flue gas wet part decline, plume rise height raise, be conducive to Pollutants Diffusion, can alleviate or eliminate chimney periphery lime rain phenomenon;
6) the utility model adopts independent waste water evaporator tower, effectively prevent the corrosion of desulfurization wastewater to evaporation region flue.
7) the utility model has automatic regulation function, can flooding velocity be regulated according to the whether complete evaporate to dryness of waste water or enter the smoke heat energy of evaporator tower, when evaporator tower temperature out is on the low side, fed back by Controlling System, regulate the smoke heat energy of air inlet evaporator tower or control evaporated water, to ensure that waste water evaporates completely.
Claims (6)
1. a coal fired power plant flue gas desulfurization Waste Water Treatment, comprise air preheater (2), electric precipitator (3), fume desulfurating absorption tower (4), induced draft fan (15) and chimney (5), described air preheater (2) front end connects boiler exhaust gas pipeline, air preheater (2) rear end and electric precipitator (3), fume desulfurating absorption tower (4), connected successively by flue between induced draft fan (15) and chimney (5), it is characterized in that: also comprise waste water liquid storage tank (7), waste water evaporator tower (10), described waste water liquid storage tank (7) receives the waste water that fume desulfurating absorption tower (4) is discharged, the water-in of described waste water evaporator tower (10) connects waste water tank (7) by inlet channel, in the middle of inlet channel, water pump (8) is set, inlet mouth one tunnel of waste water evaporator tower (10) is successively through blower fan (12), magnetic valve (14) is communicated with the smoke discharging pipe of boiler (1), another road is communicated with the flue between air preheater (2) and electric precipitator (3) through blower fan (12), connectivity part is positioned at the one end near air preheater (2), its venting port is communicated with the flue between air preheater (2) and electric precipitator (3), and the one end be positioned near electric precipitator (3).
2. coal fired power plant flue gas desulfurization Waste Water Treatment according to claim 1, it is characterized in that the flue of described electric precipitator (3) ingress is provided with temperature sensor (13), and set up flue-gas temperature pilot circuit, described flue-gas temperature pilot circuit comprises micro-chip U1, touch-screen CMP and driving mechanism U2, the communication interface of described touch-screen CMP and micro-chip U1 is bi-directionally connected, the input terminus of described driving mechanism U2 connects the control signal output terminal of micro-chip U1, the temperature data of the direct reading temperature sensor of micro-chip, judge through the built-in discriminating program of micro-chip, export the opening and closing of control signal Controlling solenoid valve (14), touch-screen CMP is used for the input of parameter and the display of temperature.
3. coal fired power plant flue gas desulfurization Waste Water Treatment according to claim 1, it is characterized in that: the top of described waste water evaporator tower (10) is provided with two-fluid spray nozzle, a fluid intake of described two-fluid spray nozzle connects water-in, another fluid intake connects inlet mouth, and inlet mouth connects high-pressure air source.
4. coal fired power plant flue gas desulfurization Waste Water Treatment according to claim 1, is characterized in that: the top of described waste water evaporator tower (10) is provided with rotational flow atomizer, and the import of described rotational flow atomizer connects water-in.
5. the coal fired power plant flue gas desulfurization Waste Water Treatment according to any one of claim 1-4, is characterized in that: the bottom of described waste water evaporator tower (10) is provided with ash bucket (11).
6. the coal fired power plant flue gas desulfurization Waste Water Treatment according to any one of claim 1-4, it is characterized in that: inlet mouth and the venting port of described waste water evaporator tower (10) are arranged at the bottom of the tower of waste water evaporator tower (10) and tower top respectively, and inlet mouth and vent position can exchange.
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|---|---|---|---|
| CN201520773601.6U CN205011413U (en) | 2015-10-08 | 2015-10-08 | Coal fired power plant flue gas desulfurization effluent disposal system |
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| CN201520773601.6U CN205011413U (en) | 2015-10-08 | 2015-10-08 | Coal fired power plant flue gas desulfurization effluent disposal system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105152254A (en) * | 2015-10-08 | 2015-12-16 | 河北省电力勘测设计研究院 | Flue gas desulfurization and wastewater treatment system for coal-fired power plant |
| CN105854575A (en) * | 2016-04-26 | 2016-08-17 | 华北电力大学（保定） | Method for simultaneously treating SO3 and desulfurization waste water in exhaust gas of coal-fired power plant |
| CN107935083A (en) * | 2017-11-13 | 2018-04-20 | 北京国电富通科技发展有限责任公司 | Power plant desulfurization wastewater treatment system |
| CN108006683A (en) * | 2017-12-28 | 2018-05-08 | 华电郑州机械设计研究院有限公司 | A kind of method and apparatus that desulfurization wastewater zero-emission is realized using full flue gas |
| CN109292866A (en) * | 2018-11-26 | 2019-02-01 | 伍育毅 | A kind of desulfurizing waste water processing device and processing method |
-
2015
- 2015-10-08 CN CN201520773601.6U patent/CN205011413U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105152254A (en) * | 2015-10-08 | 2015-12-16 | 河北省电力勘测设计研究院 | Flue gas desulfurization and wastewater treatment system for coal-fired power plant |
| CN105854575A (en) * | 2016-04-26 | 2016-08-17 | 华北电力大学（保定） | Method for simultaneously treating SO3 and desulfurization waste water in exhaust gas of coal-fired power plant |
| CN107935083A (en) * | 2017-11-13 | 2018-04-20 | 北京国电富通科技发展有限责任公司 | Power plant desulfurization wastewater treatment system |
| CN108006683A (en) * | 2017-12-28 | 2018-05-08 | 华电郑州机械设计研究院有限公司 | A kind of method and apparatus that desulfurization wastewater zero-emission is realized using full flue gas |
| CN109292866A (en) * | 2018-11-26 | 2019-02-01 | 伍育毅 | A kind of desulfurizing waste water processing device and processing method |
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Address after: 050031 No. 6 Jianbei Street, Chang'an District, Shijiazhuang City, Hebei Province Patentee after: China Electric Power Construction Group Hebei electric survey and Design Research Institute Co., Ltd. Address before: 050031 No. 6 Jianbei Street, Chang'an District, Shijiazhuang City, Hebei Province Patentee before: Hebei Province Power Surveying Design & Research Institute |