CN105833683A - Coal-fired unit equipment and control method of emission of pollutants - Google Patents
Coal-fired unit equipment and control method of emission of pollutants Download PDFInfo
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- CN105833683A CN105833683A CN201610252336.6A CN201610252336A CN105833683A CN 105833683 A CN105833683 A CN 105833683A CN 201610252336 A CN201610252336 A CN 201610252336A CN 105833683 A CN105833683 A CN 105833683A
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- flue gas
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- desulfurization
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
Abstract
The invention relates to the field of coal firing, discloses coal-fired unit equipment and a control method of emission of pollutants and particularly relates to coal-fired unit equipment. Along a flowing direction of flue gas, the equipment comprises a boiler, a denitration device, an air pre-heater, a low-temperature coal economizer, a dry type electric dust remover, a draught fan, a desulfurization absorption tower and a flue gas tower, which are communicated in sequence, wherein the boiler is internally provided with a low-nitrogen combustor. The invention further relates to the control method of emission of pollutants. With the adoption of the equipment and the method, provided by the invention, nitrogen oxide, sulfur dioxide and dust in flue gas, which are finally discharged, can meet emission standards at the same time; and compared with existing coal-fired unit equipment and process, the equipment and the method, provided by the invention, save more energy and are more reliable.
Description
Technical field
The present invention relates to coal-fired field, in particular it relates to a kind of coal unit equipment, and a kind of pollution
The control method of thing discharge.
Background technology
At present, existing coal unit pollutant emission equipment, as it is shown in figure 1, along the side of flow of flue gas
To, include successively: boiler 1, air preheater 2, dry electric precipitation device 3, air-introduced machine 4, axial-flow type
Booster fan 5, desulfurization fume heat exchanger 6, desulfuration absorbing tower 7 and chimney 8, wherein, boiler 1 is internal
Being provided with ordinary burner 9, dry electric precipitation device is provided with electric cleaner power frequency supply 10, desulfurization is inhaled
Receive tower 7 inside and be provided with desulfurization spraying layer 71 and mist separator of desulfurization 72, desulfurization spraying layer 71 from the bottom to top
Being 3 layers, mist separator of desulfurization 72 is that two-layer is flat.
Above-mentioned coal unit pollutant emission equipment can not meet nitride, titanium dioxide in final discharge flue gas
Sulfur and dust requirement the most up to standard.
But, along with the raising of environmental emission standard, single Pollutant Control Technology cannot meet super
The requirement of low stain thing emissions object, still more, under the main trend of energy-saving and emission-reduction, coal burning process is not only
High standard to be met is discharged, energy saving of system to be taken into account, therefore, at present, the urgent need a set of environmental protection of exploration,
Reliably, multiple pollutant emission control technique energy-conservation, efficient and equipment.
Summary of the invention
The invention aims to overcome prior art can not control simultaneously multiple pollutant discharge and
The defect relatively consumed energy, it is provided that a kind of coal unit equipment, and the control method of pollutant emission.
The present inventor finds under study for action, along the direction of flow of flue gas, arranges the pot being sequentially communicated
Stove, denitrification apparatus, air preheater, low-level (stack-gas) economizer, dry electric precipitation device, air-introduced machine, desulfurization are inhaled
Receiving tower and Yan Ta, wherein, boiler internal is provided with low NO, it is possible to make the flue gas finally discharged
Middle nitrogen oxides, sulfur dioxide and dust meet discharge standard simultaneously, and more energy efficient, more reliable.
Therefore, to achieve these goals, the invention provides a kind of coal unit equipment, along flue gas stream
Dynamic direction, this equipment includes that the boiler being sequentially communicated, denitrification apparatus, air preheater, low temperature save coal
Device, dry electric precipitation device, air-introduced machine, desulfuration absorbing tower and Yan Ta, wherein, boiler internal is provided with low
Nitrogen burner.
Preferably, desulfurization spraying layer and desulfurization it are provided with inside described desulfuration absorbing tower from the bottom to top except mist
Device, described desulfurization spraying layer is 4-6 layer, and mist separator of desulfurization is two-layer ridge type, one layer of tubular type.
It is highly preferred that this equipment also includes: wet electrical dust precipitator, and described wet electrical dust precipitator is with described
Desulfuration absorbing tower connects with described cigarette tower.
Preferably, rotation remittance bonder, desulfurization spraying layer it are provided with inside described desulfuration absorbing tower from the bottom to top
With bundled tube dedusting except mist integrated apparatus.
It is highly preferred that this equipment also includes: wet electrical dust precipitator, and described wet electrical dust precipitator is with described
Desulfuration absorbing tower connects with described cigarette tower.
Preferably, described denitrification apparatus is SCR denitration device.
Preferably, the design parameter of described SCR denitration device includes: design denitration efficiency >=80%, if
Meter the escaping of ammonia rate≤3ppm, crushing≤300Pa during two-layer catalyst, crushing≤500Pa during three layers of catalyst,
Adapt to flue-gas temperature and be 306-400 DEG C, SO2/SO3Conversion ratio≤1%.
Preferably, described dry electric precipitation device is provided with high frequency electric source.
Preferably, the quantity of described air-introduced machine is 2-4 platform, and described air-introduced machine connects with parallel way.
On the other hand, the invention provides the control method of a kind of pollutant emission, the method includes:
In the boiler being internally provided with low NO, carry out fire coal so as to get flue gas enter via boiler
Enter denitrification apparatus and carry out denitration process, then pass sequentially through air preheater and carry out the first cooling process, pass through
Low-level (stack-gas) economizer carries out the second cooling process, carries out the first dust removal process by dry electric precipitation device, and leads to
Cross air-introduced machine to be passed through in desulfuration absorbing tower by flue gas and carry out desulfurization process, and discharged by cigarette tower, described
The operating condition of low NO make from boiler discharge flue gas nitrous oxides concentration≤
200mg/Nm3。
Preferably, it is passed through in wet electrical dust precipitator carries out processing, through desulfuration absorbing tower desulfurization, the flue gas that obtains
Second dust removal process.
Preferably, described desulfuration absorbing tower makes flue gas carry out desulfurization process and the 3rd in desulfuration absorbing tower
Dust removal process.
Preferably, the nitrous oxides concentration≤50mg/Nm in flue gas after denitration processes3, at the first cooling
Flue-gas temperature after reason is 130-160 DEG C, and the flue-gas temperature after the second cooling processes is 85-110 DEG C, the
Dust concentration≤30mg/Nm in flue gas after one dust removal process3, the powder in flue gas after the second dust removal process
Dust concentration≤5mg/Nm3。
The coal unit equipment of the present invention and the control method of pollutant emission thereof, it is possible to significantly reduce final
The discharge nitrogen oxides of flue gas, sulfur dioxide and the concentration of dust so that the concentration of nitrogen oxides≤
50mg/Nm3, the concentration≤35mg/Nm of sulfur dioxide3, the concentration≤5mg/Nm of dust3.I.e. use
The equipment of the present invention and method, it is possible to make nitrogen oxides in effluent, sulfur dioxide and the powder finally discharged
Dirt meets discharge standard simultaneously, and compared to existing coal unit equipment and technique, the equipment of the present invention
More energy efficient with method, more reliable.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Fig. 1 is coal unit equipment and the control method of pollutant emission of prior art；
Fig. 2 is coal unit equipment and the controlling party of pollutant emission of a kind of preferred implementation of the present invention
Method；
Fig. 3 is coal unit equipment and the controlling party of pollutant emission of a kind of preferred implementation of the present invention
Method；
Fig. 4 is the SCR denitration device of a kind of detailed description of the invention of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is described in detail.It should be appreciated that
Detailed description of the invention described herein is merely to illustrate and explains the present invention, is not limited to this
Bright.
The invention provides a kind of coal unit equipment, as in Figure 2-4, along the direction of flow of flue gas,
Boiler 1 that this equipment includes being sequentially communicated, denitrification apparatus 11, air preheater 2, low-level (stack-gas) economizer 12,
Dry electric precipitation device 3, air-introduced machine 4, desulfuration absorbing tower 7 and cigarette tower 13, wherein, boiler internal is arranged
There is low NO 14.
According to coal unit equipment of the present invention, desulfuration absorbing tower 7 can be conventional the taking off in this area
Sulfur absorption tower, in a preferred embodiment, as in figure 2 it is shown, described desulfuration absorbing tower 7 internal by
Under supreme desulfurization spraying layer 71 and the mist separator of desulfurization 72 of being provided with, described desulfurization spraying layer 71 is 4-6 layer,
It is thus possible to more effectively absorb the sulfur dioxide in flue gas；Mist separator of desulfurization 72 is two-layer ridge type,
One layer of tubular type such that it is able to more effectively catch the gypsum slurries carried in flue gas so that after desulfurization processes
Sulfur dioxide concentration≤35mg/Nm in flue gas3, flue gas drop carrying amount≤50mg/Nm3。
It is highly preferred that this equipment also includes: wet electrical dust precipitator 15, and described wet electrical dust precipitator 15
Connect with described desulfuration absorbing tower 7 and described cigarette tower 13 such that it is able to reduce the powder in flue gas further
Dirt.
According to coal unit equipment of the present invention, in another kind of preferred implementation, such as Fig. 3 institute
Showing, described desulfuration absorbing tower 7 is internal is provided with rotation remittance bonder 74, desulfurization spraying layer 71 from the bottom to top
With bundled tube dedusting except mist integrated apparatus 73, such that it is able to realize desulfuration absorbing tower both can carry out desulfurization
Process can also carry out the purpose of dust removal process, and then significantly reduces in the flue gas being finally discharged in air
Various pollutant.In the present invention, rotation converges bonder, desulfurization spraying layer and bundled tube dedusting except mist integration
Device is this area conventional equipment, and its concrete structure does not repeats them here.
According to coal unit equipment of the present invention, as it is shown on figure 3, this equipment also includes: wet type electricity
Cleaner unit 15, and described wet electrical dust precipitator 15 connects with described desulfuration absorbing tower 7 and described cigarette tower 13,
It is thus possible to reduce the dust in flue gas further.
In the preferred embodiment of the present invention, as Figure 2-3, along the direction of flow of flue gas,
Boiler 1 that this equipment includes being sequentially communicated, denitrification apparatus 11, air preheater 2, low-level (stack-gas) economizer 12,
Dry electric precipitation device 3, air-introduced machine 4, desulfuration absorbing tower 7, wet electrical dust precipitator 15 and cigarette tower 13, its
In, boiler internal is provided with low NO 14, and described desulfuration absorbing tower 7 is the de-of above two structure
Sulfur absorption tower.
According to coal unit equipment of the present invention, denitrification apparatus 11 can be each of this area routine
Plant denitrification apparatus, but, in order to reduce the final concentration discharging nitrogen oxides in effluent further, preferably
Ground, denitrification apparatus 11 is SCR denitration device.
Wherein, the SCR denitration device of a kind of preferred implementation of the present invention as shown in Figure 4, along cigarette
The direction of flow of air, this SCR denitration device includes that the flue gas being sequentially communicated enters pipe 25, and ammonia sprays into
Mouth 26, catalyst plates 27, smoke discharge tube 28, wherein, ammonia entrance 26 is arranged on flue gas and enters
In the middle part of pipe 25, catalyst plates is three layers.Flue gas enters the entrance of pipe 25 and connects with boiler 1 exhaust opening,
The outlet of smoke discharge tube 28 connects with the entrance of air preheater 2.
It is highly preferred that the design parameter of described SCR denitration device includes: design denitration efficiency >=80%,
Design the escaping of ammonia rate≤3ppm, crushing≤300Pa during two-layer catalyst, crushing during three layers of catalyst≤
500Pa, adapts to flue-gas temperature and is 306-400 DEG C, SO2/SO3Conversion ratio≤1% such that it is able to make to take off
Nitrous oxides concentration≤50mg/Nm in flue gas after nitre process3。
According to coal unit equipment of the present invention, it is preferable that described dry electric precipitation device 3 is provided with
High frequency electric source such that it is able to significantly improve the dust removing effects of dry electric precipitation device.Medium-high frequency power supply of the present invention
It can be the high frequency electric source of this area routine.
According to coal unit equipment of the present invention, the quantity of described air-introduced machine can be 2-4 platform, and
Described air-introduced machine connects with parallel way.
In equipment of the present invention, low NO 14 can be the low nitrogen combustion of the various routine in this area
Burner, it is preferable that low NO 14 is double yardstick low NO and/or M-PM low NO,
It is thus possible to effectively reduce coal combustion to produce the content of the nitrogen oxides in flue gas.
In equipment of the present invention, air preheater 2 can be the air preheater that this area is conventional,
As long as so that the flue-gas temperature through air preheater 2 is reduced to 130-160 DEG C, such as may be used
Think trisector air heater.
According to equipment of the present invention, wherein, low-level (stack-gas) economizer 12 can be the low of this area routine
Temperature economizer, as long as so that being reduced to 85-110 DEG C i.e. through the flue-gas temperature of low-level (stack-gas) economizer 12
Can, can be such as its structure can be conventional horizontally disposed fin tubular type heat exchange mechanisms, water side is changed
Thermal medium is condensation water, or, conventional vertically arranged fin tubular type heat exchange mechanisms, the heat exchange of water side is situated between
Matter summer, winter was that heat supply network is hydrophobic in order to condense water.
According to equipment of the present invention, wherein, dry electric precipitation device 3 can be the various routine in this area
Dry electric precipitation device, can be such as dual chamber five E field electrostatic precipitator, wherein, described high frequency electric source
It can be HFR-II model.Owing to the flue gas reduced through the temperature of low-level (stack-gas) economizer 12 is due to flue gas stream
Prompt drop is low and dust specific resistance reduces, and dry electric precipitation device 3 is provided with high frequency electric source in addition, therefore,
In dry electric precipitation device 3, most of dust are captured, and can remove most three oxygen in flue gas simultaneously
Change sulfur so that kind of dust≤30mg/Nm that dry electric precipitation device 3 is discharged3。
In the present invention, low-level (stack-gas) economizer 12 and air preheater 2 and the connection side of dry electric precipitation device 3
The mode of communicating that formula can be known to the skilled person, as long as ensureing that flue gas is by low-level (stack-gas) economizer 12
Temperature is reduced to 85-110 DEG C.The reduction of flue-gas temperature can reduce flow velocity and the dust ratio electricity of flue gas
Resistance, it is also possible to reduce the water consumption of follow-up desulfuration absorbing tower 7 further.
According to equipment of the present invention, wherein, wet electrical dust precipitator 15 can be that this area is conventional
Wet electrical dust precipitator, as long as the dust concentration ensured in the flue gas of wet electrical dust precipitator 15≤
5mg/Nm3, can be such as low in and high out vertical flexible plate wet electrical dust precipitator and/or
Rigid plate wet electrical dust precipitator, in the equipment of the present invention, wet electrical dust precipitator 15 are arranged in level turnover
Arrange and can trap Gypsum Fibrosum that desulfuration absorbing tower 7 is carried out PM2.5 in trapping flue gas further
Deng fine dust.
On the other hand, the invention provides a kind of side using the said equipment to carry out pollutant emission control
Method, as in Figure 2-4, the method includes:
In the boiler 1 being internally provided with low NO 14, carry out fire coal so as to get flue gas via
Boiler enters denitrification apparatus 11 and carries out denitration process, then passes sequentially through air preheater 2 and carry out the first fall
Temperature processes, and carries out the second cooling process by low-level (stack-gas) economizer 12, enters 3 row by dry electric precipitation device
First dust removal process, and by air-introduced machine 4 flue gas is passed through in desulfuration absorbing tower 7 and carries out desulfurization process,
And discharged by cigarette tower 13, the operating condition of described low NO 14 makes from boiler 1 discharge
Nitrous oxides concentration≤200mg/Nm in flue gas3。
According to method of the present invention, wherein, as shown in Figures 2 and 3, it is preferable that will inhale through desulfurization
The flue gas that receipts tower 7 desulfurization process obtains is passed through in wet electrical dust precipitator 15 and carries out the second dust removal process.
According to method of the present invention, wherein, as shown in Figure 3, it is preferable that described desulfuration absorbing tower
Make flue gas carry out desulfurization in desulfuration absorbing tower to process and the 3rd dust removal process.
According to method of the present invention, wherein, the nitrous oxides concentration in flue gas after denitration processes≤
50mg/Nm3, the flue-gas temperature after the first cooling processes is 130-160 DEG C, the cigarette after the second cooling process
Temperature is 85-110 DEG C, the dust concentration≤30mg/Nm in flue gas after the first dust removal process3, second
Dust concentration≤5mg/Nm in flue gas after dust removal process3。
According to above-mentioned preferred embodiment, as Figure 2-3, flue gas discharges eventually through cigarette tower 13
In air, to realize chimney and water tower unification such that it is able to eliminate gypsum rain and visual pollution, and drop
Low energy consumption.
In the present invention, denitrification apparatus 11, air preheater 2, low-level (stack-gas) economizer 12, dry electric precipitation device
3, the concrete operations condition of air-introduced machine 4, desulfuration absorbing tower 7 and wet electrical dust precipitator 15 etc. is each dress
Put the operating condition of routine, as long as making the concentration of emission≤50mg/Nm of final nitride3, titanium dioxide
Concentration of emission≤the 35mg/Nm of sulfur3, the concentration of emission≤5mg/Nm of dust3?.
Each equipment employed in the method for the present invention has been carried out above describing in detail, the most superfluous at this
State.
The equipment of the present invention can be carried out under operating mode at full capacity, wherein, known in those skilled in the art,
Operating mode is determined by equipment initial design parameters at full capacity, and therefore, those skilled in the art is according to actual need
May determine that the operating mode at full capacity corresponding to the equipment used with it.
Embodiment 1
The present embodiment is for illustrating coal unit equipment and the control method of pollutant emission of the present invention.
As in figure 2 it is shown, under operating mode at full capacity, arrange low NO 14 (M-PM is low in inside
Nitrogen burner) boiler 1 in carry out fire coal, from boiler 1 discharge flue gas nitrous oxides concentration be
200mg/Nm3, then flue gas carries out denitration process by SCR denitration device 11 as shown in Figure 4,
The flue gas of SCR denitration device enters the entrance of pipe 25 and connects with boiler 1 exhaust opening, smoke discharge tube 28
Outlet connect with the entrance of air preheater 2, wherein, the design parameter of SCR denitration device is: set
Meter denitration efficiency is 80%, and design the escaping of ammonia rate is 2.8ppm, and during two-layer catalyst, crushing is 280Pa,
During three layers of catalyst, crushing is 450Pa, adapts to flue-gas temperature and is 306-390 DEG C, SO2/SO3Conversion ratio is
0.8% so that after denitration process, the nitrous oxides concentration in flue gas is 40mg/Nm3, then by denitration
After reason, flue gas is passed through air preheater 2 (trisector air heater) and carries out the first cooling process,
Make through the flue-gas temperature of air preheater 2 be 150 DEG C, then by the flue gas through air preheater 2
(particular type is: horizontally disposed fin tubular type heat exchange mechanisms, the heat exchange of water side to be passed through low-level (stack-gas) economizer 12
Medium is for condensing water) carry out the second cooling process so that by the flue-gas temperature of low-level (stack-gas) economizer 12 be
105 DEG C, by being passed through dry electric precipitation device 3 by the flue gas of low-level (stack-gas) economizer 12, (particular type is: double
Room five E field electrostatic precipitator, high frequency electric source model: HFR-II) carry out the first dust removal process so that dry
The kind of dust that formula electric cleaner 3 is discharged is 28mg/Nm3, dry electric precipitation device 3 is discharged
Flue gas enters desulfuration absorbing tower 7 by two air-introduced machines being connected in parallel 4, is entered by desulfuration absorbing tower 7
Row desulfurization processes, and desulfuration absorbing tower 7 is internal is provided with desulfurization spraying layer 71 and desulfurization from the bottom to top except mist
Device 72, desulfurization spraying layer 71 is 4 layers, and mist separator of desulfurization 72 is+one layer of tubular type of two-layer ridge type, de-
After sulphuring treatment, the sulfur dioxide concentration in flue gas is 34mg/Nm3, flue gas drop carrying amount is
45mg/Nm3, then after desulfurization is processed flue gas be passed through wet electrical dust precipitator 15 (particular type is: low enter
Exceed vertical flexible plate wet electrical dust precipitator) carry out the second dust removal process so that through wet type electricity
Dust concentration in the flue gas of cleaner unit 15 is 5mg/Nm3, finally wet electrical dust precipitator 15 is discharged
Flue gas is discharged in air by cigarette tower 13, and the concentration of the nitrogen oxides in effluent that cigarette tower 13 is discharged is
40mg/Nm3, the concentration of sulfur dioxide is 34mg/Nm3, the concentration of dust is 5mg/Nm3。
Embodiment 2
The present embodiment is for illustrating coal unit equipment and the control method of pollutant emission of the present invention.
As in figure 2 it is shown, under operating mode at full capacity, arrange low NO 14 (double yardsticks in inside
Low NO) boiler 1 in carry out fire coal, from boiler 1 discharge flue gas nitrous oxides concentration
For 180mg/Nm3, then make the flue gas obtained be taken off by SCR denitration device as shown in Figure 4
Nitre processes, and the flue gas of SCR denitration device 11 enters the entrance of pipe 25 and connects with boiler 1 exhaust opening, cigarette
The outlet of gas discharge pipe 28 connects with the entrance of air preheater 2, wherein, and setting of SCR denitration device
Meter parameter is: design denitration efficiency is 82%, and design the escaping of ammonia rate is 2.8ppm, during two-layer catalyst
Crushing is 260Pa, and during three layers of catalyst, crushing is 460Pa, adapts to flue-gas temperature and is 306-400 DEG C,
SO2/SO3Conversion ratio is 0.8% so that after denitration process, the nitrous oxides concentration in flue gas is
33mg/Nm3, (model is three points of storehouse swingings then flue gas after denitration process to be passed through air preheater 2
Air preheater) carry out the first cooling process so that and the flue-gas temperature through air preheater 2 is 150
DEG C, then the flue gas through air preheater 2 is passed through low-level (stack-gas) economizer 12, and (particular type is: horizontal cloth
The fin tubular type heat exchange mechanisms put, water side heat transferring medium is for condensing water) carry out the second cooling process so that
It is 100 DEG C by the flue-gas temperature of low-level (stack-gas) economizer 12, will be passed through by the flue gas of low-level (stack-gas) economizer 12
Dry electric precipitation device 3 (particular type is dual chamber five E field electrostatic precipitator, high frequency electric source model:
HFR-II) carry out the first dust removal process so that and the kind of dust that dry electric precipitation device 3 is discharged is
25mg/Nm3, the flue gas that dry electric precipitation device 3 is discharged is entered by two air-introduced machines being connected in parallel 4
Desulfuration absorbing tower 7, carries out desulfurization process by desulfuration absorbing tower 7, desulfuration absorbing tower 7 internal by down to
On be provided with desulfurization spraying layer 71 and mist separator of desulfurization 72, desulfurization spraying layer 71 is 4 layers, desulfurization remove mist
Device 72 is+one layer of tubular type of two-layer ridge type, and after desulfurization process, the sulfur dioxide concentration in flue gas is
30mg/Nm3, flue gas drop carrying amount is 40mg/Nm3, flue gas after desulfurization process is passed through wet type electricity and removes
Dirt device 15 (particular type is that rigid plate wet electrical dust precipitator is arranged in level turnover) is carried out at the second dedusting
Reason so that the dust concentration in the flue gas of wet electrical dust precipitator 15 is 3mg/Nm3, finally by wet
The flue gas that formula electric cleaner 15 is discharged is discharged in air by cigarette tower 13, the flue gas that cigarette tower 13 is discharged
The concentration of middle nitrogen oxides is 33mg/Nm3, the concentration of sulfur dioxide is 30mg/Nm3, the concentration of dust
For 3mg/Nm3。
Embodiment 3
The present embodiment is for illustrating coal unit equipment and the control method of pollutant emission of the present invention.
As it is shown on figure 3, under operating mode at full capacity, arrange low NO 14 (type is in inside
Double yardstick low NOs) boiler 1 in carry out fire coal, from boiler 1 discharge flue gas nitrogen oxidation
Substrate concentration is 170mg/Nm3, then flue gas is taken off by SCR denitration device 11 as shown in Figure 4
Nitre processes, and the flue gas of SCR denitration device 11 enters the entrance of pipe 25 and connects with boiler 1 exhaust opening, cigarette
The outlet of gas discharge pipe 28 connects with the entrance of air preheater 2, wherein, and setting of SCR denitration device
Meter parameter is: design denitration efficiency is 86%, and design the escaping of ammonia rate is 2.5ppm, during two-layer catalyst
Crushing is 250Pa, crushing 400Pa during three layers of catalyst, adapts to flue-gas temperature and is 306-400 DEG C, SO2/SO3
Conversion ratio is 0.7% so that after denitration process, the nitrous oxides concentration in flue gas is 24mg/Nm3, then
After denitration being processed, flue gas is passed through air preheater 2 (particular type is trisector air heater)
Carry out the first cooling process so that (particular type is three points of storehouse swinging air through air preheater 2
Preheater) flue-gas temperature be 135 DEG C, the flue gas through air preheater 2 is passed through low-level (stack-gas) economizer 12
(particular type for being arranged vertically, fin tubular type heat exchange mechanisms, water side heat transferring medium summer for condensing water,
Winter is that heat supply network is hydrophobic) carry out the second cooling process so that by the flue-gas temperature of low-level (stack-gas) economizer 12
Being 90 DEG C, by being passed through dry electric precipitation device 3 by the flue gas of low-level (stack-gas) economizer 12, (particular type is double
Room five E field electrostatic precipitator, high frequency electric source model: HFR-II) carry out the first dust removal process so that dry
The kind of dust that formula electric cleaner 3 is discharged is 20mg/Nm3, dry electric precipitation device 3 discharge
Flue gas enters desulfuration absorbing tower 7 by two air-introduced machines being connected in parallel 4, is entered by desulfuration absorbing tower 7
Row desulfurization processes and the 3rd dust removal process, and desulfuration absorbing tower 7 is internal is provided with rotation remittance bonder from the bottom to top
74, desulfurization spraying layer 71 and bundled tube dedusting are except mist integrated apparatus 73, and desulfurization spraying layer 71 is 3
Layer, after desulfurization process, the sulfur dioxide concentration in flue gas is 15mg/Nm3, flue gas drop carrying amount is
20mg/Nm3, dust concentration is 5mg/Nm3, after desulfurization being processed, flue gas is passed through wet electrical dust precipitator 15
(particular type is that rigid plate wet electrical dust precipitator is arranged in level turnover) carries out the second dust removal process, makes
Must be 1mg/Nm through the dust concentration in the flue gas of wet electrical dust precipitator 153, finally wet type electricity is removed
The flue gas that dirt device 15 is discharged is discharged in air by cigarette tower 13, nitrogen oxygen in the flue gas that cigarette tower 13 is discharged
The concentration of compound is 24mg/Nm3, the concentration of sulfur dioxide is 15mg/Nm3, the concentration of dust is
1mg/Nm3。
Therefore, the coal unit equipment of the present invention and the control method of pollutant emission thereof, it is possible to significantly drop
The concentration of nitrogen oxides, sulfur dioxide and the dust of low final discharge flue gas so that the concentration of nitrogen oxides
≤50mg/Nm3, the concentration≤35mg/Nm of sulfur dioxide3, the concentration≤5mg/Nm of dust3.I.e. adopt
By equipment and the method for the present invention, it is possible to the nitrogen oxides in effluent that makes finally to discharge, sulfur dioxide and
Dust meets discharge standard simultaneously, and compared to existing coal unit equipment and technique, the present invention sets
Standby more energy efficient, more reliable with method.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, but, the present invention does not limit
Detail in above-mentioned embodiment, in the technology concept of the present invention, can be to the present invention
Technical scheme carry out multiple simple variant, these simple variant belong to protection scope of the present invention.
It is further to note that each the concrete technology described in above-mentioned detailed description of the invention is special
Levy, in the case of reconcilable, can be combined by any suitable means, in order to avoid need not
The repetition wanted, various possible compound modes are illustrated by the present invention the most separately.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as its
Without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (13)
1. a coal unit equipment, it is characterised in that along the direction of flow of flue gas, this equipment includes
The boiler, denitrification apparatus, air preheater, low-level (stack-gas) economizer, the dry electric precipitation device that are sequentially communicated, draw
Blower fan, desulfuration absorbing tower and Yan Ta, wherein, boiler internal is provided with low NO.
Coal unit equipment the most according to claim 1, wherein, inside described desulfuration absorbing tower
Being provided with desulfurization spraying layer and mist separator of desulfurization from the bottom to top, described desulfurization spraying layer is 4-6 layer, desulfurization
Demister is two-layer ridge type, one layer of tubular type.
Coal unit equipment the most according to claim 2, wherein, this equipment also includes: wet type
Electric cleaner, and described wet electrical dust precipitator connects with described desulfuration absorbing tower and described cigarette tower.
Coal unit equipment the most according to claim 1, wherein, inside described desulfuration absorbing tower
It is provided with rotation from the bottom to top and converges bonder, desulfurization spraying layer and bundled tube dedusting except mist integrated apparatus.
Coal unit equipment the most according to claim 4, wherein, this equipment also includes: wet type
Electric cleaner, and described wet electrical dust precipitator connects with described desulfuration absorbing tower and described cigarette tower.
6. according to the coal unit equipment described in any one in claim 1-5, wherein, described de-
Nitre device is SCR denitration device.
Coal unit equipment the most according to claim 6, wherein, described SCR denitration device
Design parameter includes: design denitration efficiency >=80%, designs the escaping of ammonia rate≤3ppm, during two-layer catalyst
Crushing≤300Pa, crushing≤500Pa during three layers of catalyst, adapt to flue-gas temperature and be 306-400 DEG C,
SO2/SO3Conversion ratio≤1%.
8. according to the coal unit equipment described in any one in claim 1-5, wherein, described dry
Formula electric cleaner is provided with high frequency electric source.
9. draw described according to the coal unit equipment described in any one in claim 1-5, wherein,
The quantity of blower fan is 2-4 platform, and described air-introduced machine connects with parallel way.
10. the control method of a pollutant emission, it is characterised in that the method includes:
In the boiler being internally provided with low NO, carry out fire coal so as to get flue gas enter via boiler
Enter denitrification apparatus and carry out denitration process, then pass sequentially through air preheater and carry out the first cooling process, pass through
Low-level (stack-gas) economizer carries out the second cooling process, carries out the first dust removal process by dry electric precipitation device, and leads to
Cross air-introduced machine to be passed through in desulfuration absorbing tower by flue gas and carry out desulfurization process, and discharged by cigarette tower, described
The operating condition of low NO makes the nitrous oxides concentration from the flue gas that boiler is discharged be less than
200mg/Nm3。
11. methods according to claim 10, wherein, will process through desulfuration absorbing tower desulfurization
To flue gas be passed through in wet electrical dust precipitator and carry out the second dust removal process.
12. methods according to claim 10, wherein, described desulfuration absorbing tower makes flue gas exist
Carry out desulfurization in desulfuration absorbing tower to process and the 3rd dust removal process.
13. methods according to claim 10, wherein, the nitrogen oxidation in flue gas after denitration process
Substrate concentration≤50mg/Nm3, the flue-gas temperature after the first cooling processes is 130-160 DEG C, at the second cooling
Flue-gas temperature after reason is 85-110 DEG C, the dust concentration in flue gas after the first dust removal process≤
30mg/Nm3, the dust concentration≤5mg/Nm in flue gas after the second dust removal process3。
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| CN107270268A (en) * | 2017-07-12 | 2017-10-20 | 河南开祥精细化工有限公司 | A kind of boiler smoke minimum discharge device |
| CN110926227A (en) * | 2019-12-09 | 2020-03-27 | 阳新鹏富矿业有限公司 | Smelting furnace smoke dust collecting and treating method |
| CN113237074A (en) * | 2021-04-29 | 2021-08-10 | 中建材创新科技研究院有限公司 | Heating system and denitration method thereof |
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Application publication date: 20160810 |