CN209791251U - Water optimization system for wet flue gas desulfurization device for efficient dust removal in thermal power plant - Google Patents
Water optimization system for wet flue gas desulfurization device for efficient dust removal in thermal power plant Download PDFInfo
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- CN209791251U CN209791251U CN201920128342.XU CN201920128342U CN209791251U CN 209791251 U CN209791251 U CN 209791251U CN 201920128342 U CN201920128342 U CN 201920128342U CN 209791251 U CN209791251 U CN 209791251U
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Abstract
The utility model discloses a water optimization system for a wet flue gas desulfurization device with high-efficiency dust removal in a thermal power plant, wherein a flue gas pipeline at the outlet of a boiler is communicated with a flue gas inlet of a desulfurization absorption tower, and a spraying layer, a first layer flushing water pipe, a first layer ridge type demister, a second layer flushing water pipe, a third layer flushing water pipe, a second layer ridge type demister and a fourth layer flushing water pipe are sequentially arranged in the desulfurization absorption tower from bottom to top; the outlet of the oxidation fan and the inlet of the spraying layer are communicated with a slurry tank at the bottom of the desulfurization absorption tower, the chimney is communicated with a flue gas outlet at the top of the desulfurization absorption tower, the system can improve the reuse water rate of a power plant, and the condition that the concentration value of smoke dust at the outlet of the chimney is lower than 5mg/Nm can be met3The method has the advantages of environmental protection requirement and low cost.
Description
Technical Field
The utility model belongs to energy-concerving and environment-protective field relates to a wet flue gas desulfurization device water optimization system of high-efficient dust removal of thermal power plant.
Background
China is a primary energy structure mainly based on coal, however, the total emission amount of pollutants in coal-fired flue gas is high, so that the method has great threat to the atmospheric environmental problems in China and has severely restricted the economic sustainable development. Therefore, the nation pays great attention to the pollution control of the atmospheric environment, regulates the emission standard of the flue gas of the power plant and controls the smoke dust and SO2The emission concentrations of NOx and mercury are strictly limited. Therefore, part of coal-fired unit power plants in China also adopt a more economical and stable smoke synergistic treatment technology to meet the environmental protection requirement. The smoke synergistic treatment technical route is as follows: flue gas cooler(FGC) + low-low temperature electrostatic precipitator (ESP) + limestone-gypsum wet flue gas desulfurization device (FGD) + chimney with high-efficiency dust removal. By adopting the process route, the concentration value of the smoke dust discharged from the outlet of the chimney can be less than 10mg/Nm3The concentration value of the smoke dust at the outlet of the chimney can be less than 5mg/Nm by arranging a wet electric dust remover behind a limestone-gypsum wet flue gas desulfurization device (FGD) for high-efficiency dust removal3. However, except for a newly-built unit, most of additionally-arranged wet electric dust collectors in power plants face the problems of narrow transformation space, high transformation cost and the like, and the concentration of smoke dust at the outlet of a chimney of the power plant is seriously restricted to meet the stricter environmental protection requirement.
according to the research, it can be known that, the wet flue gas desulfurization device (FGD) of high-efficient dust removal is as the last link of flue gas cooperative control technical route, and most power plants regard as the defroster for guaranteeing that chimney outlet smoke concentration is up to standard, washes the water consumption as the defroster with power plant industrial water, and this reuse water that leads to the desulfurization system of power plant can't make full use of power plant, greatly reduced the reuse water rate of power plant water resource, the water has certain high-quality low-use phenomenon.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a wet flue gas desulfurization device water optimization system that high efficiency of thermal power plant removed dust, this system can improve the multiplexing water rate of power plant, and can satisfy that chimney outlet smoke concentration value is less than 5mg/Nm3The method has the advantages of environmental protection requirement and low cost.
In order to achieve the purpose, the water optimization system for the wet flue gas desulfurization device for high-efficiency dust removal of the thermal power plant comprises a boiler outlet flue gas pipeline, a desulfurization absorption tower, a multiplexing water system, a desulfurization industrial water system, an oxidation fan and a chimney;
The boiler outlet flue gas pipeline is communicated with a flue gas inlet of a desulfurization absorption tower, a spray layer, a first layer of flushing water pipes, a first layer of ridge type demister, a second layer of flushing water pipes, a third layer of flushing water pipes, a second layer of ridge type demister and a fourth layer of flushing water pipes are sequentially arranged in the desulfurization absorption tower from bottom to top, wherein an outlet of a multiplexing water system is communicated with an inlet of the first layer of flushing water pipes, an inlet of the second layer of flushing water pipes and an inlet of the third layer of flushing water pipes, and an outlet of a desulfurization industrial water system is communicated with an inlet of the fourth layer of flushing water pipes;
The outlet of the first layer of flushing water pipe is over against the lower surface of the first layer of ridge type demister, the outlet of the second layer of flushing water pipe is over against the upper surface of the first layer of ridge type demister, the outlet of the third layer of flushing water pipe is over against the lower surface of the second layer of ridge type demister, and the outlet of the fourth layer of flushing water pipe is over against the upper surface of the second layer of ridge type demister;
The outlet of the oxidation fan and the inlet of the spraying layer are communicated with a slurry pool at the bottom of the desulfurization absorption tower, and the chimney is communicated with a flue gas outlet at the top of the desulfurization absorption tower.
And a flue gas pipeline at the outlet of the boiler is communicated with a flue gas inlet of the desulfurization absorption tower sequentially through a denitration device, a flue gas cooler and a low-low temperature electrostatic dust collector.
The inlet of the spraying layer is communicated with a slurry tank at the bottom of the desulfurization absorption tower through a circulating pump.
The desulfurization absorption tower also comprises a limestone slurry tank and a slurry pump, wherein the outlet of the limestone slurry tank is communicated with the limestone slurry inlet of the desulfurization absorption tower through the slurry pump.
and the desulfurization industrial water system comprises a desulfurization industrial water tank and a washing water industrial water pump, wherein an outlet of the desulfurization industrial water tank is communicated with a water inlet of the fourth layer of washing water pipe through the washing water industrial water pump.
The reuse water system comprises a reuse water tank, an outlet of the reuse water tank is communicated with a water inlet of the first layer of flushing water pipe, a water inlet of the second layer of flushing water pipe and a water inlet of the third layer of flushing water pipe through an oil removal filter, a desulfurization process water tank and a flushing water process water pump, and an oil discharge port of the oil removal filter is communicated with an oil collecting tank.
the device also comprises a control valve, wherein two ends of the control valve are respectively communicated with an outlet of the washing water process water pump and an outlet of the washing water industrial water pump.
The system also comprises a gypsum discharge pump and a gypsum dewatering system, wherein the inlet of the gypsum dewatering system is communicated with the slurry tank at the bottom of the desulfurization absorption tower through the gypsum discharge pump.
the utility model discloses following beneficial effect has:
Wet flue gas desulfurization device water optimization system of high-efficient dust removal of thermal power plant when concrete operation, abandon traditional wet flue gas desulfurization device's water method and defroster form, make full use of power plant's existing equipment, through changing current defroster into first layer ridge defroster and second floor ridge defroster, utilize first layer ridge defroster and second floor ridge defroster to get rid of the particulate matter in the flue gas, and do not receive the influence of environment to satisfy that chimney outlet smoke and dust concentration value is less than 5mg Nm3The environmental protection requirement of avoiding addding wet-type electrostatic precipitator behind the desulfurization absorption tower and making the flue gas emission particulate matter reach standard high equipment cost and the maintenance cost of later stage operation, economic benefits is comparatively obvious. Additionally, the utility model discloses when washing the defroster, avoid the tradition to only use the mode of fresh water, reuse water through the power plant washes the upper and lower surface of the first layer ridge defroster of lower floor and the lower surface of upper second floor ridge defroster, wash the upper surface of second floor ridge defroster through desulfurization industrial water, desulfurization industrial water from the top down motion after washing the second floor ridge defroster simultaneously, when realizing that first layer ridge defroster two washes, realize the ladder utilization of desulfurization industrial water, in addition, desulfurization industrial water and the reuse water of power plant after washing drop the thick liquid pond of desulfurization absorption tower bottom as the make-up water of desulfurization absorption tower, with the purpose that reaches the water conservation and emission reduction of thermal power plant, improve the reuse water rate of power plant simultaneously.
In addition, two ends of the control valve are respectively communicated with an outlet of a washing water process water pump and an outlet of a washing water industrial water pump, and a washing water source can be flexibly switched according to working condition requirements.
drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a boiler outlet flue gas pipeline, 2 is a denitration device, 3 is a flue gas cooler, 4 is a low-temperature electrostatic dust collector, 5 is a desulfurization absorption tower, 6 is a spray layer, 7 is a circulating pump, 8 is an oxidation fan, 9 is a slurry pump, 10 is a limestone slurry tank, 11 is a gypsum discharge pump, 12 is a gypsum dehydration system, 13 is a first layer ridge demister, 14 is a second layer ridge demister, 15 is a first layer flushing water pipe, 16 is a second layer flushing water pipe, 17 is a third layer flushing water pipe, 18 is a fourth layer flushing water pipe, 19 is a flushing water industrial water pump, 20 is a flushing water process water pump, 21 is a desulfurization industrial water tank, 22 is a desulfurization process water tank, 23 is a control valve, 24 is an oil removal filter, 25 is a multiplex water tank, 26 is an oil collection tank, and 27 is a chimney.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
Referring to fig. 1, the water optimization system for the wet flue gas desulfurization device for high-efficiency dust removal in a thermal power plant of the present invention includes a boiler outlet flue gas pipeline 1, a desulfurization absorption tower 5, a reuse water system, a desulfurization industrial water system, an oxidation fan 8 and a chimney 27; the boiler outlet flue gas pipeline 1 is communicated with a flue gas inlet of a desulfurization absorption tower 5, a spraying layer 6, a first layer flushing water pipe 15, a first layer ridge type demister 13, a second layer flushing water pipe 16, a third layer flushing water pipe 17, a second layer ridge type demister 14 and a fourth layer flushing water pipe 18 are sequentially arranged in the desulfurization absorption tower 5 from bottom to top, wherein an outlet of a multiplexing water system is communicated with an inlet of the first layer flushing water pipe 15, an inlet of the second layer flushing water pipe 16 and an inlet of the third layer flushing water pipe 17, and an outlet of a desulfurization industrial water system is communicated with an inlet of the fourth layer flushing water pipe 18; the outlet of the first layer of flushing water pipe 15 is over against the lower surface of the first layer of ridge demister 13, the outlet of the second layer of flushing water pipe 16 is over against the upper surface of the first layer of ridge demister 13, the outlet of the third layer of flushing water pipe 17 is over against the lower surface of the second layer of ridge demister 14, and the outlet of the fourth layer of flushing water pipe 18 is over against the upper surface of the second layer of ridge demister 14; the outlet of the oxidation fan 8 and the inlet of the spraying layer 6 are both communicated with the slurry pool at the bottom of the desulfurization absorption tower 5, and the chimney 27 is communicated with the flue gas outlet at the top of the desulfurization absorption tower 5.
The boiler outlet flue gas pipeline 1 is communicated with a flue gas inlet of a desulfurization absorption tower 5 through a denitration device 2, a flue gas cooler 3 and a low-temperature electrostatic dust collector 4 in sequence; the inlet of the spraying layer 6 is communicated with a slurry pool at the bottom of the desulfurization absorption tower 5 through a circulating pump 7.
the utility model discloses still include limestone slurry case 10 and thick liquid pump 9, the export of limestone slurry case 10 is linked together through the limestone slurry entry of thick liquid pump 9 with desulfurization absorption tower 5.
The desulfurization industrial water system comprises a desulfurization industrial water tank 21 and a washing water industrial water pump 19, wherein the outlet of the desulfurization industrial water tank 21 is communicated with the water inlet of the fourth-layer washing water pipe 18 through the washing water industrial water pump 19; the reuse water system comprises a reuse water tank 25, the outlet of the reuse water tank 25 is communicated with the water inlet of the first layer flushing water pipe 15, the water inlet of the second layer flushing water pipe 16 and the water inlet of the third layer flushing water pipe 17 through an oil removal filter 24, a desulfurization process water tank 22 and a flushing water process water pump 20, and the oil discharge port of the oil removal filter 24 is communicated with an oil collection tank 26.
The utility model discloses still include control flap 23, wherein, control flap 23's both ends are linked together with the export of sparge water technology water pump 20 and the export of wash water industry water pump 19 respectively.
the utility model discloses still include gypsum discharge pump 11 and gypsum dewatering system 12, wherein, the entry of gypsum dewatering system 12 is linked together through the slurry pond of gypsum discharge pump 11 and desulfurization absorption tower 5 bottoms.
The utility model discloses a concrete working process does:
The flue gas output by the flue gas pipeline 1 at the outlet of the boiler is subjected to the denitration device 2 to remove nitrogen oxides in the flue gas, and the mercury oxidation catalyst in the denitration device 2 is used for inhibiting SO in the flue gas2Conversion to SO3At the same time, Hg in the smoke is extracted0Oxidation to bivalent mercury Hg2 +The flue gas output by the denitration device 2 is cooled by the flue gas cooler 3 to increase the particle size of the smoke dust in the flue gas and to ensure that part of SO in the flue gas3Adsorbed on smoke dust, and simultaneously granular mercury and bivalent mercury Hg2+Is adsorbed, neutralized and removed by ash particles, is beneficial to removing smoke dust in a low-temperature electrostatic dust collector 4 and a desulfurization absorption tower 5, and the smoke gas treated by the smoke gas cooler 3 enters the low-temperature electrostatic dust collector 4 for dust removal and then enters the low-temperature electrostatic dust collector 4 for dust removalin the desulfurization absorption tower 5;
In the desulfurization absorption tower 5, the flue gas is washed in a countercurrent mode by circulating limestone slurry sprayed by the spraying layer 6 to remove residual SO in the flue gas3、SO2The HCl and the HF move upwards and sequentially pass through a first layer of ridge demister 13 and a second layer of ridge demister 14 to remove liquid drops carried in the flue gas, finally enter a chimney 27 and are discharged through the chimney 27, meanwhile, air output by an oxidation fan 8 enters a slurry pool, a reaction byproduct is oxidized into gypsum, and then the gypsum enters a gypsum dehydration system 12 through a gypsum discharge pump 11 to be dehydrated;
After the first layer ridge mist eliminator 13 and the second layer ridge mist eliminator 14 work for a set time, the desulfurization industrial water system and the reuse water system are started, the desulfurization industrial water output by the desulfurization industrial water system is sprayed onto the upper surface of the second layer ridge type demister 14 through the fourth layer flushing water pipe 18, the reuse water output by the reuse water system is divided into three paths, wherein the first path is sprayed to the lower surface of the second layer ridge mist eliminator 14 through the third layer of flushing water pipe 17, the second path is sprayed to the upper surface of the first layer ridge mist eliminator 13 through the second layer of flushing water pipe 16, the third path is sprayed to the lower surface of the first layer ridge mist eliminator 13 through the first layer of flushing water pipe 15, so as to clean the first layer ridge type demister 13 and the second layer ridge type demister 14, and the washed reuse water and the desulfurized industrial water are taken as make-up water of the desulfurization absorption tower 5 and fall into a bottom slurry pool of the desulfurization absorption tower 5.
in addition, it should be noted that the washing water quality of the second layer ridge demister 14 is good, and the washing water after washing the second layer ridge demister 14 falls onto the first layer ridge demister 13 from top to bottom, so as to realize secondary washing of the first layer ridge demister 13, and thus realize the ladder utilization of the desulfurization industrial water in the demister system; the washing water of the first layer ridge demister 13 and the second layer ridge demister 14 finally falls into the slurry pool at the bottom of the desulfurization absorption tower 5 as make-up water to maintain the water balance of the desulfurization system.
For guaranteeing that the multiplexing water ability of power plant can satisfy the requirement of defroster sparge water, make the exhanst gas outlet particulate matter satisfy the environmental protection index when improving the multiplexing water rate of power plant, utilize deoiling filter 24 to filter and deoiling the processing of the multiplexing water of power plant, when filtering the multiplexing water of power plant, get rid of the organic matter of aquatic and contain solid volume for the multiplexing water ability of power plant can stably satisfy the requirement of defroster sparge water, and do not receive environmental impact. Meanwhile, the oil stain collected by the oil removing filter 24 is discharged into the oil collecting tank 26 and finally sent to a coal yard for blending combustion, so that resource utilization is realized.
Claims (8)
1. A water optimization system for a wet flue gas desulfurization device for efficient dust removal in a thermal power plant is characterized by comprising a boiler outlet flue gas pipeline (1), a desulfurization absorption tower (5), a reuse water system, a desulfurization industrial water system, an oxidation fan (8) and a chimney (27);
The boiler outlet flue gas pipeline (1) is communicated with a flue gas inlet of a desulfurization absorption tower (5), a spraying layer (6), a first layer flushing water pipe (15), a first layer ridge demister (13), a second layer flushing water pipe (16), a third layer flushing water pipe (17), a second layer ridge demister (14) and a fourth layer flushing water pipe (18) are sequentially arranged in the desulfurization absorption tower (5) from bottom to top, wherein an outlet of a reuse water system is communicated with an inlet of the first layer flushing water pipe (15), an inlet of the second layer flushing water pipe (16) and an inlet of the third layer flushing water pipe (17), and an outlet of a desulfurization industrial water system is communicated with an inlet of the fourth layer flushing water pipe (18);
The outlet of the first layer of flushing water pipe (15) is over against the lower surface of the first layer of ridge demister (13), the outlet of the second layer of flushing water pipe (16) is over against the upper surface of the first layer of ridge demister (13), the outlet of the third layer of flushing water pipe (17) is over against the lower surface of the second layer of ridge demister (14), and the outlet of the fourth layer of flushing water pipe (18) is over against the upper surface of the second layer of ridge demister (14);
The outlet of the oxidation fan (8) and the inlet of the spraying layer (6) are communicated with a slurry pool at the bottom of the desulfurization absorption tower (5), and the chimney (27) is communicated with a flue gas outlet at the top of the desulfurization absorption tower (5).
2. The water optimization system for the wet flue gas desulfurization device with high efficiency dust removal in the thermal power plant as claimed in claim 1, characterized in that the flue gas pipeline (1) at the outlet of the boiler is communicated with the flue gas inlet of the desulfurization absorption tower (5) through the denitration device (2), the flue gas cooler (3) and the low-temperature electrostatic precipitator (4) in sequence.
3. The water optimization system for the wet flue gas desulfurization device with high dust removal efficiency in the thermal power plant as claimed in claim 1, characterized in that the inlet of the spray layer (6) is communicated with the slurry pool at the bottom of the desulfurization absorption tower (5) through a circulating pump (7).
4. The water optimization system for the wet flue gas desulfurization device with high dust removal efficiency in the thermal power plant as recited in claim 1, further comprising a limestone slurry tank (10) and a slurry pump (9), wherein an outlet of the limestone slurry tank (10) is communicated with a limestone slurry inlet of the desulfurization absorption tower (5) through the slurry pump (9).
5. The water optimization system for the wet flue gas desulfurization device with high dust removal efficiency in the thermal power plant as recited in claim 1, characterized in that the desulfurization industrial water system comprises a desulfurization industrial water tank (21) and a washing water industrial water pump (19), wherein an outlet of the desulfurization industrial water tank (21) is communicated with a water inlet of the fourth-layer washing water pipe (18) through the washing water industrial water pump (19).
6. The water optimization system for the wet flue gas desulfurization device with high dust removal efficiency in the thermal power plant as claimed in claim 1, wherein the water reuse system comprises a reuse water tank (25), the outlet of the reuse water tank (25) is communicated with the water inlet of the first layer of flushing water pipe (15), the water inlet of the second layer of flushing water pipe (16) and the water inlet of the third layer of flushing water pipe (17) through an oil removal filter (24), a desulfurization process water tank (22) and a flushing water process water pump (20), and the oil discharge port of the oil removal filter (24) is communicated with an oil collection tank (26).
7. The water optimizing system for the wet flue gas desulfurization device with high dust removal efficiency in the thermal power plant as recited in claim 1, further comprising a control valve (23), wherein two ends of the control valve (23) are respectively communicated with the outlet of the washing water process water pump (20) and the outlet of the washing water industrial water pump (19).
8. The water optimization system for the wet flue gas desulfurization device with high dust removal efficiency in the thermal power plant as claimed in claim 1, further comprising a gypsum discharge pump (11) and a gypsum dehydration system (12), wherein the inlet of the gypsum dehydration system (12) is communicated with the slurry pool at the bottom of the desulfurization absorption tower (5) through the gypsum discharge pump (11).
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| CN201920128342.XU CN209791251U (en) | 2019-01-24 | 2019-01-24 | Water optimization system for wet flue gas desulfurization device for efficient dust removal in thermal power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109647147A (en) * | 2019-01-24 | 2019-04-19 | 华能国际电力股份有限公司 | The wet flue gas desulfurizer of thermal power plant's high-effective dust-removing water optimization system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109647147A (en) * | 2019-01-24 | 2019-04-19 | 华能国际电力股份有限公司 | The wet flue gas desulfurizer of thermal power plant's high-effective dust-removing water optimization system and method |
| CN109647147B (en) * | 2019-01-24 | 2023-10-10 | 华能国际电力股份有限公司 | Water optimization system and method for wet flue gas desulfurization device for efficient dust removal of thermal power plant |
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