CN207822769U - A kind of coal-fired plant flue gas low-temperature denitration device - Google Patents
A kind of coal-fired plant flue gas low-temperature denitration device Download PDFInfo
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- CN207822769U CN207822769U CN201721616165.7U CN201721616165U CN207822769U CN 207822769 U CN207822769 U CN 207822769U CN 201721616165 U CN201721616165 U CN 201721616165U CN 207822769 U CN207822769 U CN 207822769U
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Abstract
The utility model provides a kind of its device of coal-fired plant flue gas low-temperature denitration, which includes deduster, digester, white-smoke-removing device, heater, low temperature SCR denitration reactor, exhaust fan and online flue gas inspection analysis system.Wherein, flue gas is mixed into low-temperature SCR reactor with ammonia after dedusting, desulfurization, water removal and carries out denitration.The equipment for denitrifying flue gas of the utility model embodiment, using low-temperature denitration catalyst, and the problems such as arrange and after dust-removal and desulfurizing, avoid that dust content is big, sulfur content is high, make catalyst poisoning, failure；Reaction temperature is low, and installation cost is low, easy for installation, does not interfere with power plant boiler body construction, easy to operate, has not only met the environmental requirement of denitration, but also have prodigious economic benefit.
Description
Technical field
The utility model belongs to environmental technology field more particularly to a kind of coal-fired plant flue gas low-temperature denitration device.
Background technology
Currently, coal-burning power plant discharge smoke pollution be that China atmospheric environment PM2.5 is exceeded, haze weather take place frequently it is important because
One of element.Dedusting at present and desulfurization technology have obtained relatively broad application in fired power generating unit, have denitration technology only
Limitation causes the restriction arrived very much to the removal of nitrogen oxides.National 2337.8 ten thousand tons of nitrogen oxide emission in 2012, thermoelectricity
The NOx total amounts of factory's discharge are about 1106.8 ten thousand tons, account for about the 56% of national discharged nitrous oxides total amount, are main atmosphere pollution
One of fixed discharge source.
Since the active temperature of commercial selective-catalytic-reduction denitrified (SCR) catalyst is 300-400 DEG C, industrial SCR
Reactor is usually placed in before deduster, such catalyst can be washed away by high concentration flue dust, wear and flying dust in impurity
Pollution, smoke temperature is excessively high also to make catalyst that sintering, inactivation occur, or NH occurs3It is oxidized to the side reactions such as NO.Research and development
The low-temperature SCR technology that denitration can be carried out after deduster or even after desulfurization, can both reduce the murder by poisoning to catalyst such as flying dust
Effect, avoids catalyst poisoning, and can simplify arrangement or the change of existing system.Low-temperature SCR reactor can directly be configured at and remove
After dirt and desulfurizer, it is convenient for matching with existing boiler system in this way, without other relevant apparatus are generated with big influence, this
The preheating energy consumption that also can avoid flue gas outside, substantially reduces denitration cost.
Meanwhile proceeding from our national conditions, research low-temperature SCR technology also have its necessity.Domestic coal-burning power plant's areal variation
Greatly, the differences such as boiler, coal, flue gas condition used by each coal-burning power plant are also big, this to adopt for different coal-burning power plants
With necessity of different NOx control technologies, if any coal-burning power plant using can be up to standard after low nitrogen burning control technology.In addition, existing
Oneself widely applied Medium temperature SCR technology, crucial catalyst production technology and Benitration reactor designing technique remain as prosperity
Country is monopolized, domestic never successful to the production domesticization work of medium temperature SCR catalyst so that in specific engineering reality
Developed country is limited by trampling always.Therefore, a variety of denitration technologies, especially low-temperature SCR technology are developed, can be the control of NOx
System offer is a variety of to meet the actual scheme of power plant.
Invention content
To solve the above-mentioned problems, the utility model aim is to provide a kind of simple in structure, and low energy consumption, can urge this
Magnificent agent use avoids dust and toxic action of the sulfur dioxide to catalyst, extends the use of catalyst after desulfurization, dedusting
The coal-fired plant flue gas low-temperature denitration device in service life.
The technical solution of the utility model is：A kind of coal-fired plant flue gas low-temperature denitration device, which is characterized in that the device
Including dust-extraction unit, desulfurizer, white-smoke-removing device, duct heater, SCR reactors, exhaust fan and industrial personal computer；
Wherein, one end of the dust-extraction unit is connect with coal-fired plant flue gas outlet, and the other end described in pipeline by taking off
One end of sulphur device connects, and the other end of the desulfurizer is connect with one end of the white-smoke-removing device, the white-smoke-removing dress
The other end set is connect with one end of the duct heater, and the other end of the duct heater is reacted with the SCR
One end of device connects, and the other end of the SCR reactors is connect with one end of the exhaust fan, the dust-extraction unit and desulfurization
Pipeline between device is equipped with flowmeter, and the flowmeter is connected with exhaust fan control, the dust-extraction unit, desulfurization
Device, white-smoke-removing device, duct heater, SCR reactors, exhaust fan are controlled with the industrial personal computer and are connected.
Further, the dust-extraction unit, desulfurizer, white-smoke-removing device, duct heater, SCR reactors and tail gas
The inlet of wind turbine is equipped with sample tap；The SCR reactors are equipped with sample tap；The exhaust fan is frequency conversion fan.
Further, the duct heater includes heating tube, temperature transducer, current controller and insulation shell；
Wherein, several heating tubes are arranged inside the insulation shell, and the both ends of the insulation cladding are equipped with air inlet
And gas outlet, the temperature transducer are arranged inside the insulation shell, the current controller and the heating tube are electrical
Connection, the temperature transducer are connected with current controller control.
Further, which further includes preceding temperature sensor, rear temperature sensor, preceding NH3Detection sensor, preceding NH3Detection
Sensor；
The preceding temperature sensor and rear temperature sensor are separately positioned on exit and the entrance of the SCR reactors
Place；
The preceding NH3Detection sensor and rear NH3Detection sensor is separately positioned on the both ends of the SCR reactors.
Further, the control of 4 temperature of the duct heater is at 90-130 DEG C.
Further, it is 0.3-0.75m that volume is filled in the SCR reactors 53, aperture is the honeycomb cordierite of 1-5mm
Denitrating catalyst block.
Further, the mass percent of aluminum soluble salt described in the honeycomb cordierite denitrating catalyst block is 5%-
20%, the mass percent of soluble cerium salt is 60%-85% and the mass percent of soluble manganese salt is 10%-30%.
The utility model has the beneficial effects that：Utility model device is simple in structure, and low energy consumption, before having application well
Scape.Catalyst component is not belonging to heavy metal, will not cause secondary pollution, the temperature in use of existing denitrating catalyst is 300-
It 400 DEG C, can only be arranged in before desulfurization, dedusting, the toxic action of gas washed away with sulphur proposes higher want to catalyst
It asks, and contains heavy metal, be easy to cause secondary pollution, decaying catalyst processing cost is high.Low temperature prepared by the utility model
SCR denitration, when temperature in use is 100 DEG C, you can ensure 70% denitration efficiency, this catalyst can be used
After desulfurization, dedusting, dust and toxic action of the sulfur dioxide to catalyst are avoided, the service life of catalyst is extended.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of coal-fired plant flue gas low-temperature denitration device of the utility model.
Specific implementation mode：
The utility model is specifically described below by examples of implementation, to make those skilled in the art can be with
It is better understood from the utility model, but the scope of protection of the utility model is not limited to following embodiments.
As shown in Figure 1, a kind of coal-fired plant flue gas low-temperature denitration device of the utility model, the device include dust-extraction unit 1,
Desulfurizer 2, white-smoke-removing device 3, duct heater 4, SCR reactors 5, exhaust fan 6 and industrial personal computer 7；
Wherein, one end of the dust-extraction unit 1 is connect with coal-fired plant flue gas outlet, and the other end described in pipeline by taking off
One end of sulphur device 2 connects, and the other end of the desulfurizer 2 is connect with one end of the white-smoke-removing device, the white-smoke-removing
The other end of device is connect with one end of the duct heater, and the other end of the duct heater and the SCR are anti-
One end of device is answered to connect, the other end of the SCR reactors is connect with one end of the exhaust fan, 1 He of the dust-extraction unit
Pipeline between desulfurizer 2 is equipped with flowmeter 13, and the flowmeter 13 is connected with the control of the exhaust fan 6, described to remove
Dirt device 1, desulfurizer 2, white-smoke-removing device 3, duct heater 4, SCR reactors 5, exhaust fan 6 with the industry control
The control connection of machine 7.
The dust-extraction unit 1, desulfurizer 2, white-smoke-removing device 3, duct heater 4, SCR reactors 5 and tail gas wind
The inlet of machine 6 is equipped with sample tap 8；The SCR reactors 5 are equipped with sample tap 8；The exhaust fan 6 is frequency conversion fan.
The duct heater 4 includes heating tube 4-1, temperature transducer 4-2, current controller 4-3 and insulation shell
4-4；
Wherein, several heating tube 4-1 are arranged inside the insulation shell 4-4, the both ends of the insulation shell 4-4
Equipped with air inlet and gas outlet, the temperature transducer 4-2 is arranged inside the insulation shell 4-4, the current controller
The 4-3 and heating tube 4-1 is electrically connected, and the temperature transducer 4-2 and current controller 4-3 controls connect.
Further, which further includes preceding temperature sensor 9, rear temperature sensor 10, preceding NH311 and of detection sensor
NH afterwards3Detection sensor 12；
The preceding temperature sensor 9 and rear temperature sensor 10 are separately positioned on the exit of the SCR reactors 5 and enter
At mouthful；
The preceding NH3Detection sensor 11 and rear NH3Detection sensor 12 is separately positioned on the two of the SCR reactors 5
End.
The operation principle of utility model device is：First, now by coal-fired plant flue gas, (nitrous oxides concentration is in 180-
220mg/m3, ammonia nitrogen ratio is between 0.8-1.2) by the exhaust fan 6 of tail portion with exhaust gas volumn 500m3/h-1500m3The flow of/h
Import dust-extraction unit 1, desulfurizer 2 and white-smoke-removing device 3 are dusted, the processing of desulfurization and white-smoke-removing, will after treatment
Flue gas is heated to 90-130 DEG C by duct heater 4, will be carried out in flue gas importing SCR reactors after heat treatment low
Warm denitration process, it is 0.3-0.75m that volume is filled in SCR reactors3, aperture is the honeycomb cordierite denitration catalyst of 1-5mm
Agent is discharged.
The preparation method of the honeycomb cordierite denitrating catalyst is：
Step 1：Prepare Mn-CeO2/Al2O3Catalyst powder：Using deionized water as solvent, a certain amount of solubility is weighed
Aluminium salt, soluble cerium salt and soluble manganese salt are dissolved in deionized water respectively, stir 1.5-2.2h, then in mixed liquor by
It is added dropwise to 30% ammonium hydroxide stirring, adjusting pH is 9-11, continues to stir 1.5-2.2h, deionized water is used after still aging 11-13h
Flushing is unchanged to pH, and finally in moving air atmosphere, dry 11-13h under the conditions of 105-115 DEG C is 540- in temperature
560 DEG C of calcining 2-4h, are cooled to room temperature, obtain Mn-CeO2/Al2O3Catalyst powder.
Further, the aluminum soluble salt 5%-20%, solubility cerium salt 60%-85% and soluble manganese salt 10%-
30%.
(2) honeycomb cordierite low-temperature denitration catalyst is prepared：By polyvinyl alcohol (PVA), emulsifier op-10 be added to from
In sub- water, 1h is stirred, milky slurries is obtained, is slowly added to the Mn-CeO that step 1 is prepared2/Al2O3Powder stirs 20-
Honeycomb cordierite catalyst carrier is finally immersed in catalyst slurry by 40min, aperture blowing, calcining, and it is 1-5mm to obtain aperture
Honeycomb cordierite denitrating catalyst.
Embodiment 1
It is 200 pieces of 100mm × 100mm × 150mm honeycomb catalysts that catalyst activity, which evaluates catalyst usage amount, in pilot scale
Reaction in device, reaction condition are [NH3]/[NO]=1, the amount of nitrogen oxides is about 200mg/m3, NH3=200ppm, passes through tail
Gas wind turbine is pumped into power-plant flue gas, flow 600m3/h.It is tested according to following temperature gradient, specific data are as follows：
| Temperature DEG C | 90 | 100 | 110 | 120 | 130 |
| Denitration efficiency | 62.59% | 68.3% | 73.93% | 78.5% | 85.5% |
Embodiment 2
It is 400 pieces of 100mm × 100mm × 150mm honeycomb catalysts that catalyst activity, which evaluates catalyst usage amount, in pilot scale
Reaction in device, reaction condition are [NH3]/[NO]=1, react 110 DEG C of flue-gas temperature, the amount of nitrogen oxides is about 200mg/m3,
It is pumped into power-plant flue gas by frequency conversion exhaust fan, and changes flue gas flow.It is tested according to following flow gradients, as a result such as
Under：
| Flue gas flow m3/h | 600(1000h-1) | 800(1333h-1) | 1000(1666h-1) | 1200(2000h-1) |
| Denitration efficiency | 74.3% | 75.5% | 76.4% | 75.8% |
Embodiment 3
It is 400 pieces of 100mm × 100mm × 150mm honeycomb catalysts that catalyst activity, which evaluates catalyst usage amount, in
Interior reaction is set in trial assembly, and reaction condition is 110 DEG C of flue-gas temperature, and the amount of nitrogen oxides is about 200mg/m3, pass through frequency conversion tail gas wind
Machine is pumped into power-plant flue gas, flue gas flow 1000m3/ h changes the amount for spraying into ammonia by ammonia flow gauge.According to following ammonia nitrogen
It is tested than gradient, it is as a result as follows：
Claims (6)
1. a kind of coal-fired plant flue gas low-temperature denitration device, which is characterized in that the device includes dust-extraction unit（1）, desulfurizer
（2）, white-smoke-removing device（3）, duct heater（4）, SCR reactors（5）, exhaust fan（6）And industrial personal computer（7）；
Wherein, the dust-extraction unit（1）One end connect with coal-fired plant flue gas outlet, the other end passes through desulfurization described in pipeline
Device（2）One end connection, the desulfurizer（2）The other end connect with one end of the white-smoke-removing device, it is described except white
The other end of cigarette device is connect with one end of the duct heater, the other end of the duct heater and the SCR
One end of reactor connects, and the other end of the SCR reactors is connect with one end of the exhaust fan, the dust-extraction unit
（1）And desulfurizer（2）Between pipeline be equipped with flowmeter（13）, the flowmeter（13）With the exhaust fan（6）Control
System connection, the dust-extraction unit（1）, desulfurizer（2）, white-smoke-removing device（3）, duct heater（4）, SCR reactors
（5）, exhaust fan（6）With the industrial personal computer（7）Control connection.
2. the apparatus according to claim 1, which is characterized in that the dust-extraction unit（1）, desulfurizer（2）, white-smoke-removing dress
It sets（3）, duct heater（4）, SCR reactors（5）And exhaust fan（6）Inlet be equipped with sample tap（8）；It is described
SCR reactors（5）It is equipped with sample tap（8）；The exhaust fan（6）For frequency conversion fan.
3. the apparatus according to claim 1, which is characterized in that the duct heater（4）Including heating tube（4-1）、
Temperature transducer（4-2）, current controller（4-3）And insulation shell（4-4）；
Wherein, several heating tubes（4-1）It is arranged in the insulation shell（4-4）Inside, the insulation shell（4-4）Two
End is equipped with air inlet and gas outlet, the temperature transducer（4-2）It is arranged in the insulation shell（4-4）Inside, the electric current
Controller（4-3）With the heating tube（4-1）Electrical connection, the temperature transducer（4-2）With the current controller（4-3）
Control connection.
4. the apparatus according to claim 1, which is characterized in that the device further includes preceding temperature sensor（9）, rear temperature passes
Sensor（10）, preceding NH3Detection sensor（11）, rear NH3Detection sensor（12）；
The preceding temperature sensor（9）With rear temperature sensor（10）It is separately positioned on the SCR reactors（5）Exit and
Inlet；
The preceding NH3Detection sensor（11）With rear NH3Detection sensor（12）It is separately positioned on the SCR reactors（5）Two
End.
5. the apparatus according to claim 1, which is characterized in that the duct heater（4）Heating temperature is ranging from
90-130℃。
6. the apparatus according to claim 1, which is characterized in that the SCR reactors（5）In be filled with volume be 0.3-
0.75 m3, aperture is the honeycomb cordierite denitrating catalyst block of 1-5mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721616165.7U CN207822769U (en) | 2017-11-28 | 2017-11-28 | A kind of coal-fired plant flue gas low-temperature denitration device |
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| CN201721616165.7U CN207822769U (en) | 2017-11-28 | 2017-11-28 | A kind of coal-fired plant flue gas low-temperature denitration device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108079777A (en) * | 2017-11-28 | 2018-05-29 | 石河子大学 | A kind of coal-fired plant flue gas low-temperature denitration method and its device |
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2017
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108079777A (en) * | 2017-11-28 | 2018-05-29 | 石河子大学 | A kind of coal-fired plant flue gas low-temperature denitration method and its device |
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