CN209530529U - SO in a kind of coal-fired flue-gas3Removing system - Google Patents
SO in a kind of coal-fired flue-gas3Removing system Download PDFInfo
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Abstract
The utility model relates to SO in a kind of coal-fired flue-gas3Removing system, belong to coal-fired flue-gas pollutant control technical field.To solve SO3Caused low-temperature space flue, the etching problem of equipment and the blockage problem of air preheater, the utility model provide SO in a kind of coal-fired flue-gas3Removing system, including the mouth that dusts being arranged in MgO powder storage tank, batcher, radio frequency pump, MgO tube cell road, compressed air supply unit, vent line and flue.When the mouth that dusts is set to after economizer, the SO in flue gas can be removed3, avoid SO3It is reacted with the ammonia in SCR denitration device and generates NH4HSO4；When the mouth that dusts is set to before air preheater, the SO in flue gas can be removed simultaneously3And NH4HSO4；The utility model is applied to the improvement of coal-fired flue-gas pollutant, not only can guarantee SO3Qualified discharge, moreover it is possible to solve the problems, such as low-temperature space flue and equipment corrosion and air preheater blockage problem.
Description
Technical field
The utility model belongs to SO in coal-fired flue-gas pollutant control technical field more particularly to a kind of coal-fired flue-gas3's
Removing system.
Background technique
SO3It is the important pollutant of one kind of coal-burning power plant's discharge, SO3With H2O reaction generates H2SO4, to low after deduster
Warm equipment and flue have serious corrosivity, greatly shorten its service life and safety in operation.In addition, SO3In denitration
Cheng Zhonghui reacts with ammonia, generates ammonium hydrogen sulfate, the Severe blockage of air preheater is caused in performing low-load running of machine set
Problem.On the other hand, the SO being discharged into atmosphere3And H2SO4It is the major pollutants and atmosphere PM to form acid rain2.5Weight
Want one of source.
As environmental protection standard is increasingly stringenter, coal-burning power plant is to SO3Control also put on schedule, Chinese Shanghai area hair
It is 5mg/m that " the atmosphere pollution control standard " of cloth, which requires coal-burning power plant's sulfuric acid mist emission limit,3.Therefore, SO is controlled3Discharge
Concentration is solved by SO3Bring problem of environmental pollution is imperative.
SO in coal-fired flue-gas3Removing sulfuldioxide mainly include low temperature electric precipitator removing SO3Technology, desulfurization tower section are de-
Except SO3, wet electrical dust precipitator remove SO3Technology.
Low temperature electric precipitator removes SO3Technology is to drop flue-gas temperature using electric precipitator entrance flue gas temperature is reduced
As low as SO3Dew-point temperature hereinafter, SO3It is collected in electric precipitator after the ash package of high concentration.This technology is to SO3Go
Except rate is higher, but revamping workload is very big, and the corrosion of flue gas attemperator is very fast, and deduster itself is also required to carry out anti-corruption
It makes, whole high investment, while etching problem is not easy to control.This technology requires dust content in flue gas, needs dust dense
Degree, which reaches certain standard, just can be used, and not be available when dust content is less.
Desulfurizing tower partial removal SO3It is the function subsidiary in desulfurizing tower scrubbing CO_2, but three oxidation in desulfurizing tower
The removal efficiency of sulphur is very low, only 20%-30%, so this technology is only attached to function, it is not SO3The mainstream of removing sulfuldioxide.
Wet electrical dust precipitator SO with higher3Removal efficiency, and performance is stablized.But it is last before chimney that it is that flue gas enters
Level-one environmental protection equipment can guarantee SO3Qualified discharge, but can not solve the problems, such as air preheater blocking and flue, equipment
Etching problem, and wet electrical dust precipitator cost is higher.
By SO in the above coal-fired flue-gas3Removing sulfuldioxide is it is found that although the prior art can satisfy SO3Qualified discharge, but can not
Solve flue, the etching problem of equipment and the blockage problem of air preheater.
Summary of the invention
To solve the pollutant SO in coal-fired flue-gas3Caused low-temperature space flue, the etching problem of equipment and air preheat
The blockage problem of device, the utility model provide SO in a kind of coal-fired flue-gas3Removing system.
The technical solution of the utility model includes:
SO in a kind of coal-fired flue-gas3Removing system, including MgO powder storage tank, batcher, radio frequency pump, MgO tube cell road, pressure
The mouth that dusts being arranged in contracting air supplies, vent line and flue,
The MgO powder storage tank is successively connected with batcher and radio frequency pump by MgO tube cell road, the compressed air gas supply dress
It sets and is connected by vent line and radio frequency pump, the radio frequency pump is connect with the mouth that dusts being arranged in flue, the mouth setting of dusting
After economizer or before air preheater.
Further, the MgO powder tank bottom is equipped with air distribution plate, and the air distribution plate is connected with vent line, be used for
Air is passed through in MgO powder storage tank makes MgO powder have mobility；The MgO powder tank top is equipped with bag filter, the cloth bag
Deduster makes that the fluidized wind in MgO powder storage tank is discharged in time and MgO powder is not lost.
Further, the compressed air of compressed air supply unit output first pass through enter back into after heater heating it is logical
Air pipe.
Further, the batcher is frequency conversion star-shaped feeding machine.
It further, further include the flue gas on-line analysis system and control system for being set to exhanst gas outlet.
SO in a kind of coal-fired flue-gas3Removing process, using MgO powder as reducing agent, the MgO powder in MgO powder storage tank is through MgO powder
Pipeline sequentially enters batcher and radio frequency pump, and the compressed air in compressed air supply unit enters radio frequency pump through vent line,
After MgO powder in radio frequency pump is mixed with compressed air, it is set and is sprayed in flue in the mouth that dusts in flue, mouth is set when dusting
When in the flue after being placed in economizer, MgO powder and the SO in the flue gas for passing through economizer3It reacts, the MgSO of generation4It is removing
It is removed in dirt device, realizes SO3Removing；
When in the flue before the mouth that dusts is set to air preheater, MgO powder and the cigarette by economizer and denitrification apparatus
SO in gas3And NH4HSO4It reacts, the MgSO generated respectively4(NH4)2Mg(SO4)2It is removed, realizes in deduster
SO3And NH4HSO4Removing.
Further, the partial size of the MgO powder≤352 mesh.
Further, the flow velocity of the compressed air is 10-12m/s, and temperature is 70-80 DEG C.
Further, the batcher is frequency conversion star-shaped feeding machine；In variable load operation, by being set to exhanst gas outlet
Flue gas on-line analysis system is by SO in flue gas3Cont signal be transferred to control system, control system is according to SO3Content it is real-time
The MgO powder feeding coal of star-like frequency conversion batcher is adjusted, realizes SO under the conditions of variable load operation3And NH4HSO4Removing.
Further, the feeding coal of the MgO powder presses MgO and SO3Molar ratio be 2~4:1 calculate.
The utility model has the beneficial effects that
SO in coal-fired flue-gas provided by the utility model3Removing system cost is low, revamping workload is small, combustion based on this
SO in flue-gas3Removing process, using MgO powder as reducing agent, when MgO powder dusts in the flue that mouth is set to after economizer,
The SO in the flue gas by economizer can efficiently be removed3, to avoid SO3It is reacted with the ammonia after economizer in denitrification apparatus
Generate NH4HSO4；When MgO powder dusts in the flue that mouth is set to before air preheater, can efficiently remove by economizer and
SO in the flue gas of denitrification apparatus3And NH4HSO4.Therefore the utility model passes through the SO in removing coal-fired flue-gas3Solves SO3's
The problem of qualified discharge and low-temperature space flue and equipment are corroded generates NH by avoiding4HSO4Or in removing coal-fired flue-gas
NH4HSO4Solves the blockage problem of air preheater.
Detailed description of the invention
Fig. 1 is SO in a kind of coal-fired flue-gas of the utility model3Removing system schematic diagram；
In figure: 1, MgO powder storage tank, 2, batcher, 3, radio frequency pump, 4, MgO tube cell road, 5, compressed air supply unit, 6,
Vent line, 7, sprinkling flue, 8, dust mouth, 9, air distribution plate, 10, bag filter, 11, heater.
Specific embodiment
The technical solution of the utility model is described further below with reference to embodiment, however, it is not limited to this, all
That technical solutions of the utility model are modified or replaced equivalently, without departing from technical solutions of the utility model spirit and
Range should all cover in the protection scope of the utility model.
Embodiment 1
SO in a kind of coal-fired flue-gas3Removing system, including MgO powder storage tank 1, batcher 2, radio frequency pump 3, MgO tube cell road
4, the mouth 8 that dusts being arranged in compressed air supply unit 5, vent line 6 and flue 7, the MgO powder storage tank 1 pass through MgO tube cell
Road 4 is successively connected with batcher 2 and radio frequency pump 3, and the compressed air supply unit 5 is connected by vent line 6 and radio frequency pump 3
It connects, the radio frequency pump 3 is connect with the mouth 8 that dusts being arranged in flue 7, and the mouth 8 that dusts is set to after economizer or air is pre-
Before hot device.
The type selecting of the present embodiment device therefor determines that existing equipment is i.e. composable according to MgO powder dosage needed for reacting
Implement.
Embodiment 2
The present embodiment the difference from embodiment 1 is that, feed opening, bottom cone bucket are arranged at 1 bottom of MgO powder storage tank in the present embodiment
Equipped with air distribution plate 9, the air distribution plate 9 is connected with vent line 6, has MgO powder for being passed through air into MgO powder storage tank 1
Good mobility is without hardened；
It is equipped with bag filter 10 at the top of MgO powder storage tank 1 simultaneously, the bag filter 10 can make in MgO powder storage tank 1
Fluidized wind be discharged in time and MgO powder is not lost.
Bag filter 10 is also connected to air pipeline 6, when being attached to a certain amount of MgO powder on bag filter 10,
The MgO powder on bag filter 10 is blown off into MgO powder storage tank using the compressed air in air pipeline 6, reduces MgO powder
Loss.
Embodiment 3
The present embodiment and the difference of embodiment 1 or embodiment 2 are that compressed air supply unit 5 exports in the present embodiment
Compressed air first pass through heater 11 heat after enter back into vent line 6.
The purpose that compressed air heats is: preventing magnesium powder humidity hardened, blocks pipeline.
Defeated powder air, that is, compressed air requires pressure to be not less than 80Kpa, as air quantity >=11.5m3When/min, compressed air is supplied
Device of air can choose roots blower or compressed air cylinder.As air quantity < 11.5m3When/min, roots blower pressure, which is not achieved, to be wanted
Evaluation can not carry out type selecting, can only select compressed air cylinder at this time.Since compressed air dosage is smaller, it is not separately provided generally
Air compressor, compressed air You Zhu factory provide, and the present embodiment system is only arranged compressed air cylinder and receives the compression that main factory provides
Air, compressed air tank volume select 10m3。
Embodiment 4
The present embodiment and the difference of embodiment 1,2 or 3 are that batcher 2 is frequency conversion star-shaped feeding machine in the present embodiment, also
Flue gas on-line analysis system and control system including being set to exhanst gas outlet, to realize SO under the conditions of variable load operation3With
NH4HSO4Removing.
Embodiment 5
SO in a kind of coal-fired flue-gas3Removing process, using MgO powder as reducing agent, the MgO powder in MgO powder storage tank 1 is through MgO
Tube cell road 4 sequentially enters batcher 2 and radio frequency pump 3, and the compressed air in compressed air supply unit 5 enters through vent line 6
Radio frequency pump 3, after the MgO powder that radio frequency pumps in 3 is mixed with compressed air, is set and is sprayed to flue 7 in the mouth 8 that dusts in flue 7
It is interior,
When in the flue after the mouth 8 that dusts is set to economizer, MgO powder and the SO in the flue gas for passing through economizer3Occur
Reaction, the MgSO of generation4It is removed in deduster, realizes SO3Removing；
When in the flue before the mouth 8 that dusts is set to air preheater, MgO powder and process economizer and SCR denitration device
Flue gas in SO3And NH4HSO4It reacts, the MgSO of generation4(NH4)2Mg(SO4)2It is removed, realizes in deduster
SO3And NH4HSO4Removing.
Remove SO3MgO is that have remaining later, and remaining MgO is nontoxic, also not adversely affects, is removing to ash composition
It is mixed into ash after being collected in dirt device.
MgO, i.e. magnesia are commonly called as magnesia, also referred to as magnesia, and magnesia is basic anhydride, logical with basic anhydride
Property, belong to cementitious material, white powder is odorless, tasteless, nontoxic, is typical alkaline earth oxide.
Reaction product MgSO4It can react to form magnesium oxysulfide concrete with light burnt powder after being dissolved in water, magnesium oxysulfide concrete has preferable
Fire line, heat insulating ability, durability and the feature of environmental protection, apply in anti-fire door core board, external wall insulation, siliceous modified insulation board, anti-
The numerous areas such as fiery plate.
SO provided in this embodiment3The reducing agent that uses of removing process and reaction product be nontoxic object
Matter will not cause secondary pollution to environment.
Embodiment 6
SO in coal-fired flue-gas provided in this embodiment3Removing process and the difference of embodiment 5 be, in the present embodiment
The partial size of MgO powder≤352 mesh, and the flow velocity of the compressed air provided by compressed air supply unit 5 is 10-12m/s, temperature
It is 70-80 DEG C.
Theoretically the partial size of MgO powder is smaller is more conducive to MgO and SO3It is reacted, therefore the present embodiment requires MgO powder
Partial size≤352 mesh；
The temperature that is carried along into for the compressed air that MgO powder is 10-12m/s by flow velocity in the present embodiment is 300-500 DEG C
In flue, to make MgO and SO3It comes into full contact with, and is adequately reacted, SO3The flue length of removing system can guarantee
Time of contact >=1 second of MgO and flue gas.
In the present embodiment compressed air supply unit 5 export compressed air first pass through heater 11 heat after enter back into it is logical
Air pipe 6.
The purpose that compressed air heats is: preventing magnesium powder humidity hardened, blocks pipeline.
Defeated powder air, that is, compressed air requires pressure to be not less than 80Kpa, as air quantity >=11.5m3When/min, compressed air is supplied
Device of air can choose roots blower or compressed air cylinder.As air quantity < 11.5m3When/min, roots blower pressure is not achieved
Required value can not carry out type selecting, can only select compressed air cylinder at this time.
Embodiment 7
SO in a kind of coal-fired flue-gas3Removing process, using partial size≤352 mesh MgO powder as reducing agent, in MgO powder storage tank 1
MgO powder sequentially enter batcher 2 and radio frequency pump 3 through MgO tube cell road 4, the compressed air flow velocity in compressed air supply unit 5
For 10-12m/s, temperature is 70-80 DEG C, enters radio frequency pump 3 through vent line 6, the MgO powder and compressed air in radio frequency pump 3 are mixed
After conjunction, the mouth 8 that dusts being set in the flue after economizer 7 is sprayed in flue 7, MgO powder and the flue gas by economizer
In SO3It reacts, the MgSO of generation4It is removed in deduster, realizes SO3Removing；
SO not only may be implemented in the present embodiment3Qualified discharge, while also can solve low-temperature space flue and equipment corrosion
Problem, moreover it is possible to by efficiently reducing the SO in flue gas3Content reduces SO3It is reacted with the ammonia after economizer in SCR denitration device
Generate NH4HSO4Amount, to solve the blockage problem of air preheater.
Embodiment 8
SO in a kind of coal-fired flue-gas3Removing process, using partial size≤352 mesh MgO powder as reducing agent, in MgO powder storage tank 1
MgO powder sequentially enter batcher 2 and radio frequency pump 3 through MgO tube cell road 4, the compressed air flow velocity in compressed air supply unit 5
For 10-12m/s, temperature is 70-80 DEG C, enters radio frequency pump 3 through vent line 6, the MgO powder and compressed air in radio frequency pump 3 are mixed
After conjunction, it is set and is sprayed in flue 7 in the mouth 8 that dusts in flue 7,
When in the flue before the mouth 8 that dusts is set to air preheater, MgO powder and process economizer and SCR denitration device
Flue gas in SO3And NH4HSO4It reacts, generates MgSO respectively4(NH4)2Mg(SO4)2, wherein (NH4)2Mg(SO4)2Tool
There is good water solubility and contamination is weak, the features such as easily processing by soot blower, alleviates the ammonium hydrogen sulfate blockage problem of air preheater significantly.
SO3And NH4HSO4It is removed in deduster, realizes SO3And NH4HSO4Removing, the present embodiment by removing combustion
SO in flue-gas3And NH4HSO4Solves SO3Qualified discharge, low-temperature space flue and equipment the problem of corroding and air it is pre-
The blockage problem of hot device.
Embodiment 9
The present embodiment and the difference of embodiment 5,6,7 or 8 are that batcher 2 is frequency conversion star-shaped feeding machine in the present embodiment；
Further include the flue gas on-line analysis system and control system for being set to exhanst gas outlet, can be realized SO under the conditions of variable load operation3
And NH4HSO4Removing.
In variable load operation, by being set to the CEMS flue gas on-line analysis system of exhanst gas outlet for SO in flue gas3Contain
Amount signal is transferred to DCS control system or PLC control system, and DCS control system or PLC control system are according to SO3Content it is real
When adjust the MgO powder feeding coal of star-like frequency conversion batcher, realize SO under the conditions of variable load operation3And NH4HSO4Removing.
Embodiment 10
The present embodiment and the difference of embodiment 5,6,7,8 or 9 be, in the present embodiment the feeding coal of MgO powder by MgO with
SO3Molar ratio be 4:1 calculate.
The present embodiment is calculated for using 350MW unit:
SO3Mass Calculation:
SO3Quality=Coal-fired capacity × sulfur content Sar× organic sulfur ratio × SO2To SO3Conversion ratio × 80/32
Wherein: Coal-fired capacity: 155.6t/h；
Sulfur content Sar: 3.70%；
Organic sulfur ratio: generally 0.9；
SO2To SO3Conversion ratio: being 1% in general furnace, is 2% after SCR denitration；
The atomic mass of S takes 32, SO3Molecular mass take 80；
SO3Mass Calculation obtains 287.76kg/h.
SO3Concentration calculation:
SO3Concentration=SO3Quality/exhaust gas volumn
Wherein: SO3Quality: 287.76kg/h
Exhaust gas volumn: 1022655Nm3/ h (standard state, wet basis, practical O2)
SO3Concentration calculation obtains 252mg/Nm3。
MgO powder consumption calculates:
Theory reaction: MgO+SO3→MgSO4
NH3+SO3+H2O→NH4HSO4
MgO+2NH4HSO4→(NH4)2Mg(SO4)2+H2O
The MgO and SO known to reacting above3In molar ratio≤1:1 is reacted, to guarantee the practical behaviour of removal efficiency
MgO and SO in work3Molar ratio generally take 2~4:1, the present embodiment presses MgO and SO3Molar ratio take 4:1 to carry out.
SO is designed at this stage3And NH4HSO4Removal efficiency is not less than 65%, can achieve 90% or more when high-efficient, specifically
Removal effect also needs to test or Practical Project is modified.
MgO consumption calculates:
MgO consumption=SO380 × 40 ÷ MgO purity of quality × removal efficiency ÷ × MgO and SO3Molar ratio
Wherein: SO3Quality: 287.76kg/h；
Removal efficiency: 65% is taken；
MgO purity: 90%；
MgO and SO3Molar ratio: 4:1；
SO3Molecular mass take the molecular mass of 80, MgO to take 40,
MgO consumption Mass Calculation obtains 375kg/h.
Claims (5)
1. SO in a kind of coal-fired flue-gas3Removing system, which is characterized in that including MgO powder storage tank (1), batcher (2), radio frequency pump
(3), the mouth that dusts (8) being arranged in MgO tube cell road (4), compressed air supply unit (5), vent line (6) and flue (7),
The MgO powder storage tank (1) is successively connected with batcher (2) and radio frequency pump (3) by MgO tube cell road (4), and the compression is empty
Gas feeder (5) is connect by vent line (6) with radio frequency pump (3), the spray being arranged in the radio frequency pump (3) and flue (7)
Powder mouth (8) connection, the mouth that dusts (8) are set to after economizer or before air preheater.
2. SO in a kind of coal-fired flue-gas according to claim 13Removing system, which is characterized in that the MgO powder storage tank (1)
Bottom is equipped with air distribution plate (9), and the air distribution plate (9) is connected with vent line (6), for being passed through air into MgO powder storage tank (1)
Make MgO powder that there is mobility；
Bag filter (10) are equipped at the top of the MgO powder storage tank (1), the bag filter (10) makes in MgO powder storage tank (1)
Fluidized wind be discharged in time and MgO powder is not lost.
3. SO in a kind of coal-fired flue-gas according to claim 1 or claim 23Removing system, which is characterized in that the compressed air
The compressed air of feeder (5) output enters back into vent line (6) after first passing through heater (11) heating.
4. SO in a kind of coal-fired flue-gas according to claim 33Removing system, which is characterized in that the batcher (2) is
Frequency conversion star-shaped feeding machine.
5. SO in a kind of coal-fired flue-gas according to claim 43Removing system, which is characterized in that further include being set to flue gas
The flue gas on-line analysis system and control system of outlet.
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| Application Number | Priority Date | Filing Date | Title |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109701381A (en) * | 2019-02-25 | 2019-05-03 | 哈尔滨锅炉厂环保工程技术有限公司 | SO in a kind of coal-fired flue-gas3Removing system and removing process |
| CN111068485A (en) * | 2019-12-25 | 2020-04-28 | 天津天钢联合特钢有限公司 | Method for preventing denitration catalyst from being blocked |
| CN114682382A (en) * | 2022-03-02 | 2022-07-01 | 湖北净天环保设备有限公司 | Aerosol catcher |
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2019
- 2019-02-25 CN CN201920235032.8U patent/CN209530529U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109701381A (en) * | 2019-02-25 | 2019-05-03 | 哈尔滨锅炉厂环保工程技术有限公司 | SO in a kind of coal-fired flue-gas3Removing system and removing process |
| CN111068485A (en) * | 2019-12-25 | 2020-04-28 | 天津天钢联合特钢有限公司 | Method for preventing denitration catalyst from being blocked |
| CN114682382A (en) * | 2022-03-02 | 2022-07-01 | 湖北净天环保设备有限公司 | Aerosol catcher |
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