CN209630943U - A kind of thermal power plant's ozone denitrating system - Google Patents
A kind of thermal power plant's ozone denitrating system Download PDFInfo
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- CN209630943U CN209630943U CN201821605918.9U CN201821605918U CN209630943U CN 209630943 U CN209630943 U CN 209630943U CN 201821605918 U CN201821605918 U CN 201821605918U CN 209630943 U CN209630943 U CN 209630943U
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Abstract
The utility model discloses a kind of thermal power plant's ozone denitrating systems, are made of oxygenerator, ozone generator and ozone denitrification apparatus.Wherein, the peak-frequency regulation of thermal power plant's power supply unit electricity more than needed is that oxygenerator power supply carrys out oxygen producing；Ozone generator receives the oxygen that oxygenerator is produced, and is passed directly into ozone denitrification apparatus by peak regulation of power plant frequency modulation high pressure electrical environment electric discharge production ozone, carries out denitration process to the flue gas of power plant emission.The system then using oxygen as waste ozone, converts electrical energy into the chemical energy of fuel by having more than needed electricity oxygen using power generation station-service peak-frequency regulation.The system directly consumes the peak regulation power of power plant, and indirect utilization abandonment, which abandons light and abandons water, abandons nuclear electricity, alleviates grid balance and peak-valley difference problem, extends the service life of electric power factory equipment, realizes the covert storage of electric energy and efficiently use.
Description
Technical field
The utility model belongs to coal steam-electric plant smoke denitration field, specially carries out denitration process to flue gas using ozone and is
System.
Background technique
In the prior art, thermal power plant's peak regulation work has become contradiction more outstanding in operation of power networks, at present country's thermoelectricity
The transformation of flexibility peak regulation is directed to Winter heat supply unit, and how to adjust summer peak regulation is one put in face of numerous thermal power plants
Problem reduces the energy waste during peak regulation, it is contemplated that power plant is in fierceness to meet peaking demand of power grid to the greatest extent
Living necessities in competition, the reform that depth carries out peak regulation are imperative.
On the other hand, thermal power plant's minimum discharge promote on a large scale at home by Thermal Power Generation Industry.Existing dry or wet SCR
Denitrating system investment is huge, and is difficult to realize ultralow or even some area requirements zero-emissions.It can therefore, it is necessary to find one kind
It is realized with a low cost the flue gas desulfurization and denitrification processing technique of minimum discharge.
Known, ozone is universally acknowledged broad-spectrum high efficacy disinfection sanitizer.Air or oxygen is used to utilize height for raw material
Frequency electrion generates ozone.Ozone active oxygen atom more than oxygen molecule, the chemical property of ozone is especially active, tool
There is the strong oxidizing property for being only second to fluorine, is had the ability completely by the NO in flue gas adverse circumstancesXIt is oxidized to high-valence state, improves nitrogen in flue gas
The water solubility of oxide, to pass through wet elution.
Exhaust gas in power plant boiler is mainly NOX, component are as follows: about 95%NO and 5%NO2, NO is not readily dissolved in water, together
When alkaline matter of also getting along well react, and NO2It is relatively soluble easily in water.NO2Solubility be 20 times of NO, can and wet process
The lye of desulfurization spray, which reacts, generates nitrate.
NO easily can be oxidized to water-soluble generation HNO as a kind of strong oxidizer by ozone2And HNO3NO2、
N2O3、N2O5Etc. high-valence states nitrogen oxides, then absorbed using alkaline solution, finally by NO in exhaust gasXRemoving, NOXGo
Except rate is up to 95%.
Utility model content
In view of the problems of the existing technology, the purpose of the utility model is to provide a kind of thermal power plant's ozone denitrating system,
Ozone is produced using peak-frequency regulation electric power of having more than needed, so that ozone denitration technology be utilized to realize the minimum discharge of thermal power plant.
To achieve the goals above, the utility model provides the following technical solutions:
A kind of thermal power plant's ozone denitrating system, including, oxygenerator, with the peak-frequency regulation of thermal power plant's power supply unit electricity more than needed
Amount is power supply, oxygen producing；Ozone generator provides oxygen conveying by oxygenerator, and passes through peak regulation of power plant frequency modulation high-voltage electricity
Environment electric discharge production ozone；The ozone that ozone generator generates is passed directly into ozone denitrification apparatus, to the flue gas of power plant emission
Carry out denitration process.
Optionally, the oxygenerator is electrolysis water trough.Using peak regulation of power plant frequency modulation electricity more than needed by inverter to electricity
Sink power supply is solved with oxygen producing.Being electrolysed oxygen processed can be in solid polymer electrolytic sink oxygen and alkaline electrolysis sink oxygen
Any one.
Further, the water of the electrolysis water trough can come from the Water Treatment workshop of thermal power plant.
Further, the cooling water of the electrolysis water trough is used to from power plant condensation water lines, the electrolysis water trough waste heat
Heat power plant condensation water.
Optionally, the oxygenerator is air separation unit oxygen.
It is power supply is that the air separation unit is powered using the peak-frequency regulation of thermal power plant's power supply unit electricity of having more than needed.
The air separation unit is using any one in three kinds of cryogenic refrigeration, pressure-variable adsorption or UF membrane modes or combines system
Take oxygen.
The beneficial effects of the utility model are as follows:
(1) peak regulation power of power plant is directly consumed, indirect utilization abandonment, which abandons light and abandons water, abandons nuclear electricity, alleviates grid balance
And the problem of peak-valley difference.
(2) service life for extending electric power factory equipment carries out covert storage to electric energy, realize the energy storage-stable and
Effective use.
(3) reaction time is short, and speed is fast；It absorbs completely, purification efficiency is high；Do not generate secondary pollution.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of thermal power plant's ozone denitrating system embodiment one.
Fig. 2 is the structural schematic diagram of thermal power plant's ozone denitrating system embodiment two.
Fig. 3 is the structural schematic diagram of thermal power plant's ozone denitrating system embodiment three.
Fig. 4 is the structural schematic diagram of thermal power plant's ozone denitrating system example IV.
Appended drawing reference:
Between 1 station boiler, 2 power plant chemistry water treatment vehicles, 3 economizers, 4 ozone generators, 5 ozone denitrification apparatus, 6 steamers
Machine, 7 generators, 8 send power transformation and power supply control apparatus, 9 air separation units, 10 oxygen containers, 11 electrolysis water troughs, 12 inverters, 13 to remove
Oxygen device, 14 high-pressure heaters, 15 low-pressure heaters, 16 pure water preparing devices, 17 small pumps
Specific embodiment
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
The core of the utility model is to provide a kind of thermal power plant's ozone denitrating system, which can be realized the efficient of the energy
It utilizes, avoids peak regulation process losses electric energy.
Embodiment one
A kind of thermal power plant's ozone denitrating system, including, it is 2, economizer 3 between station boiler 1, power plant chemistry water treatment vehicle, smelly
Oxygen Generator 4, steam turbine 6, generator 7, send power transformation and power supply control apparatus 8, air separation unit 9, storage oxygen at ozone denitrification apparatus 5
Tank 10, electrolysis water trough 11, inverter 12, oxygen-eliminating device 13, high-pressure heater 14, low-pressure heater 15, pure water preparing device 16
With small pump 17.
It wherein, is power supply using the peak-frequency regulation surplus electricity of power plant power supply unit, that is, using sending power transformation and for automatically controlled
Device 8 processed is the power supply of air separation unit 9.Air separation unit 9 using each component physical property in air difference, using cryogenic refrigeration,
Oxygen, nitrogen are isolated in the methods of absorption, UF membrane from air.Then by the oxygen storage isolated in oxygen container 10,
For the use of ozone generator 4.
The oxygen output pipe of air separation unit 9 is provided with gas-filtering device and/or purification device, by obtained gas
Filtering and purification, improve the purity of gas, avoid impurity effect, so as to preferably utilize oxygen obtained.
Electrolysis water trough 11 is the device that electrolysis water reaction is carried out by electric energy, is equipped with and connect with the power supply unit of thermal power plant
Power end, that is, using the output electricity of thermal power plant's power supply unit as power supply carry out electrolysis water operation.In this example, electrolysis water trough 11
Electric energy is obtained by inverter 12.
Electrolysis water trough 11 presses the connection type of electrode, can be divided into two class of acyclic type and bipolar type.
It can be by power plant generator in electricity consumption low ebb rank by the effect of electrolysis water trough 11 and power plant power supply unit
The peak regulation surplus electricity of section is utilized, and converting electrical energy into oxygen can be used.
The oxygen output pipe connection of electrolysis water trough 11 is connected to ozone generator 4 by oxygen container 10.
The oxygen output pipe of electrolysis water trough 11 is provided with gas-filtering device and/or purification device, by obtained gas
It is filtered and purifies, so that the purity of gas is higher, avoid impurity effect, so as to preferably utilize oxygen obtained.
Being electrolysed oxygen processed can be solid polymer electrolytic technology and alkaline electrolyte oxygenerating technology.
Optionally, the water source of solid polymer electrolytic device and alkaline electrolyte device may come from boiler wastewater or pot
The condensed water of furnace system.
The water source of electrolysis water trough 11 may come from 2 outflows between power plant chemistry water treatment vehicle through pure water preparing device 16
Processed water.
Optionally, Water Treatment workshop of the water of electrolysis water trough 11 from thermal power plant.
Optionally, from power plant condensation water lines, 11 waste heat of electrolysis water trough is used to heat the cooling water of electrolysis water trough 11
Power plant condensation water.
Optionally, oxygen output pipe is equipped with contaminant filter.
Ozone generator 4 receives the oxygen from oxygen container 10, produces ozone, be used for ozone denitrification apparatus 5.
Optionally, the method that ozone generator 4 can use corona discharge type, dry oxygen or oxygen-containing gas flow through by
The corona discharge region of inner and outer electrodes composition, the interior high-frequency and high-voltage electric energy for applying thousands of volts of region of discharge, will flow into region of discharge
Unstripped gas ionization generate ozone.
The method that ozone generator 4 can also use electrolytic generates ozone using the electrochemical oxidation process of water.Contain water
In the water for changing fluorescence anion electrolyte, water oxygen can be melted by ozone with high current power at room temperature in approximation.
Under cryogenic conditions, O3Main chemical reactions between NO are as follows:
NO+O3—>NO2+O2；NO2+O3—>NO3+O2；NO3+NO2—>N2O5
With other chemical substances such as CO, SO in gas phaseXEtc. comparing, NOXCan be soon by ozone oxidation, this is allowed for
NOXOzone oxidation have very high selectivity.Because of the NO in gas phaseXIt is converted to be dissolved in the ionic compound of aqueous solution, this
Allow for that oxidation reaction is more complete, to irreversibly be stripped of the NO in exhaust gasX.Through peroxidization, the ozone of addition
It is consumed by reacting, is decomposed in the lye that excessive ozone can spray in spray column, without generating secondary pollution.
The influence factor of ozone denitration mainly has molar ratio, reaction temperature and reaction time etc., these factors imitate denitration
The influence of rate is as follows:
Molar ratio [O3]/[NO] refer to O3The ratio of molal quantity between NO, it reflects ozone amount relative to nitric oxide
The height of amount.When NO molar ratio is 0.8 in ozone injection rate and flue gas, the removal efficiency of NO reaches 94%；Increase ozone usage, NO
Removal efficiency is without significant change；After self-control ozone enhancing catalyst, ozone and vaporous water react in catalyst surface and generate hydroxyl
Base free radical works as O to improve the oxidation efficiency of ozone3: when NO (mol:mol)=0.7, denitration efficiency reaches 85% or more.N
Oxygenation efficiency with [O3]/[NO] raising ramp.In other words, in 0≤[O3]/[NO] in the case where < 1, denitrification rate is reachable
To 85% or more.Theoretically, the NO of 1molXNeed the O of 1mol3It goes to remove, O3Amount deficiency will lead to NOXRemoval efficiency reduce,
But O3It will cause the increase of operating cost when excessive, therefore in industrial application, general molar ratio all controls within 1.5.
Flue-gas temperature is also to influence one of the factor of ozone denitration efficiency, and the temperature more high de-agglomeration half period is shorter.It is general and
Speech, for ozone in the environment of 150 DEG C, itself resolution ratio is little, the reaction temperature of usual ozone denitration all control 150 DEG C with
Under.
Reaction time of the ozone in flue gas, therefore residence time of the ozone in flue became more readily available guarantor quickly
Card.In this case, ozone, which mixes with flue gas uniformity coefficient, becomes the determinant of ozone denitration efficiency.Ozone is in flue
Interior VELOCITY DISTRIBUTION is uniform, and flow direction is adjusted so as at that time, NOXConversion ratio can just be guaranteed.Using reasonable injection/mixing dress
Set is to make O3With the mixed uniformly effective measures of flue gas.
In order to make the NO in ozone and exhaust gasXIt is sufficiently mixed, the ozone gas come out from ozone generator is sprayed by ozone
Grid distribution device is penetrated, it is uniform to spray into desulfurizing tower air inlet tube section, generate flue gas using the exhaust mixer of setting rapid
Stream guarantees the NO in ozone and exhaust gasXIt can come into full contact with and react.Due to ozone and NOXRapid reaction, substantially will not be by
To SO2Influence, therefore do not need additionally to increase equipment, it is only necessary to the arrangement spray ozone grid in flue.Entirely
Total crushing that ozone injection grid distribution device is mixed with flue gas is no more than 300Pa.
Embodiment two
Oxygen is prepared using electrolysis water trough 11, is then stored in oxygen container 10, through oxygen output pipe to ozone generator 4
Supply oxygen.
Electrolysis water trough 11 2 pure water preparing device can also be connected between power plant chemistry water treatment vehicle, utilize pure water
The water resource that preparation facilities is formed as water source, electrolysis water trough 11, pure water preparing device 16, station boiler 1 and steam turbine 6 it
Between can form water-flow circuit, such as the water supply line of electrolysis water trough 11 can be connected with the steam turbine of boiler, to utilize
The condensed water of steam turbine carries out electrolytic hydrogen production.
In this example, thermal power plant's ozone denitrating system can use peak regulation of power plant frequency modulation electricity more than needed by inverter to electrolysis
Sink 11 is powered, the oxygen of mass production high-purity.
The other modular constructions and connection relationship of ozone denitrating system and one corresponding construction of embodiment and pass is connect in this example
Be it is identical, repeat no more.
Embodiment three
Oxygen is prepared using air separation unit 9, and is stored by oxygen container 10, is used for ozone generator 4.
The other modular constructions and connection relationship of ozone denitrating system and one corresponding construction of embodiment and pass is connect in this example
Be it is identical, repeat no more.
Example IV
When preparing ozone, oxygen used can be bought the ozone denitrating system from the outside, and be stored in oxygen container
In 10.
The other modular constructions and connection relationship of ozone denitrating system and one corresponding construction of embodiment and pass is connect in this example
Be it is identical, repeat no more.
Except thermal power plant's ozone denitrating system provided by the various embodiments described above, the structure of other each sections in the system is asked
With reference to the prior art, repeats no more herein.
Thermal power plant's ozone denitrating system provided by the utility model by using peak regulation of power plant frequency modulation have more than needed electricity oxygen,
Again using oxygen as waste ozone, the chemical energy of fuel is converted electrical energy into.
Thermal power plant's ozone denitrating system can directly consume the peak regulation power of power plant, and indirect utilization abandonment abandons light and abandons water abandoning
Nuclear electricity alleviates grid balance and peak-valley difference problem, extends the service life of electric power factory equipment, realizes the stable storage of electric energy
And effective use, the power plant electricity using at the peak time imbalance that alleviates of high degree lead to damage to electric power factory equipment.
Thermal power plant's ozone denitrating system provided by the utility model, power plant peak regulation system and power plant are carried out above
It is discussed in detail.Specific example used herein is expounded the principles of the present invention and embodiment, the above reality
The explanation for applying example is merely used to help understand the method and its core concept of the utility model.For the ordinary skill people of the art
Member for, under the premise of not departing from the utility model principle, can also to it, some improvement and modification can also be carried out, these improvement and modification
It falls into the protection scope of the utility model claims.
Claims (8)
1. a kind of thermal power plant's ozone denitrating system characterized by comprising
Oxygenerator, using the peak-frequency regulation of thermal power plant's power supply unit electricity more than needed as power supply, oxygen producing；
Ozone generator (4), the oxygen that oxygenerator is produced are delivered to ozone generator (4), pass through peak regulation of power plant frequency modulation high pressure
Electrical environment electric discharge production ozone；
Ozone denitrification apparatus (5), the ozone that ozone generator (4) generates are passed directly into ozone denitrification apparatus (5), arrange thermal power plant
The flue gas put carries out denitration process.
2. a kind of thermal power plant's ozone denitrating system according to claim 1, which is characterized in that the oxygenerator is electrolysis
Sink (11).
3. a kind of thermal power plant's ozone denitrating system according to claim 2, which is characterized in that electrolysis water trough (11) is to carry out
The device of electrolysis water reaction, is equipped with the power end connecting with the power supply unit of thermal power plant.
4. a kind of thermal power plant's ozone denitrating system according to claim 2, which is characterized in that the oxygen of electrolysis water trough (11) is defeated
Piping connection is connected to ozone generator (4) by oxygen container (10) out.
5. a kind of thermal power plant's ozone denitrating system according to claim 2, which is characterized in that the oxygen of electrolysis water trough (11) is defeated
Pipeline is provided with gas-filtering device and/or purification device out.
6. a kind of thermal power plant's ozone denitrating system according to claim 4 or 5, which is characterized in that set on oxygen output pipe
There is contaminant filter.
7. a kind of thermal power plant's ozone denitrating system according to claim 1, which is characterized in that the oxygenerator is space division
Device (9).
8. a kind of thermal power plant's ozone denitrating system according to claim 7, which is characterized in that the oxygen of air separation unit (9) is defeated
Pipeline is provided with gas-filtering device and/or purification device out.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111719163A (en) * | 2020-07-02 | 2020-09-29 | 浙江大学 | Device and method for denitration of flue gas by coupling water electrolysis hydrogen production of coal-fired power plant |
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- 2018-09-29 CN CN201821605918.9U patent/CN209630943U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111719163A (en) * | 2020-07-02 | 2020-09-29 | 浙江大学 | Device and method for denitration of flue gas by coupling water electrolysis hydrogen production of coal-fired power plant |
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