CN207641256U - A kind of auxiliary denitrating system suitable for the coal-burning boiler start and stop stage - Google Patents
A kind of auxiliary denitrating system suitable for the coal-burning boiler start and stop stage Download PDFInfo
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- CN207641256U CN207641256U CN201721310819.3U CN201721310819U CN207641256U CN 207641256 U CN207641256 U CN 207641256U CN 201721310819 U CN201721310819 U CN 201721310819U CN 207641256 U CN207641256 U CN 207641256U
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Abstract
The utility model provides a kind of auxiliary denitrating system suitable for the coal-burning boiler start and stop stage, includes the spray equipment in the flue between economizer and SCR reactors, and the spray equipment is sequentially connected a heating device and a mixer by a main pipe road；The mixer is separately connected a H by three bye-passes2O2Storage tank, one potent dose of storage tank and a synergist storage tank, for mixing H2O2, potent dose and synergist；The heating device is used for mixed H2O2, potent dose and synergist be heated into steam, the spray equipment is delivered to by the main pipe road, to be sprayed to flue gas in the flue；The H2O2Storage tank is also connected with a low-temperature control system.
Description
Technical field
The utility model is related to denitrating flue gas fields, and in particular to a kind of auxiliary suitable for the coal-burning boiler start and stop stage is de-
Nitre system.
Background technology
Nitrogen oxides (NOx) one of as the main atmosphere pollution of coal fired power plant, can be formed nitric acid type acid rain and
Form photochemical fog, can also destroy ozone layer, and there is very strong toxicity, to health, environment, ecology and society,
Economic destruction is all very big.NOx includes N2O、NO、NO2、NO3、N2O4、N2O5Deng, wherein cause atmosphere pollution mainly NO and
NO2.And NO is the main component that coal burning generates NOx, accounts for about the 95% of coal-fired NOx total amounts.In addition, the NOx in air
The direct burning of coal is mostly come from, and China is coal-fired big country, so currently reducing the most pressing task of NOx emission just
It is NOx caused by control fire coal.
For the emission reduction of NOx, coal fired power plant mainly administers the NOx generated in flue gas, includes mainly SCR
(selective catalytic reduction), SNCR (selective non-catalytic reduction method), SNCR/SCR, plasma method, directly catalysis reduction
Decomposition method, biomass active carbon adsorption etc..In numerous denitrating techniques, SCR technology is most ripe at present, practical achievement is most
A kind of flue-gas denitration process.SCR technology refers to utilizing NH3、CO、H2, the reducing agents such as hydro carbons, have selection under the action of catalyst
The NOx in flue gas is reduced into property N2And H2O.Newly-built at present, active service coal-powder boiler mainly based on SCR technology, participates in for 2014
The denitrating technique of environmental protection industry registration is mainly SCR, accounts for about the 95.0% of total capacity.
Although SCR technology is to apply most flue-gas denitration process at present, when flue-gas temperature is less than the work of SCR catalyst
When making temperature (280~420 DEG C), denitrating system can not start, and cause coal fired power plant in start and stop stove, can not be by NOx in flue gas
Concentration drop to discharge standard or less.And the environmental law and fossil-fuel power plant atmospheric pollutant emission standard that China newly promulgates require me
State's coal fired power plant will carry out " full working scope denitration ", while be influenced by electric power installation surplus, power plant units start and stop peak regulation number
Showed increased.So being badly in need of developing a kind of auxiliary denitrating system suitable for the coal-burning boiler start and stop stage.
Utility model content
To overcome prior art problem, the utility model to provide a kind of auxiliary denitration suitable for the coal-burning boiler start and stop stage
System effectively controls the concentration of NOx in flue gas in the coal-burning boiler start and stop stage, and coal-burning boiler is made to meet wanting for " full working scope denitration "
It asks, improves the reliability of flue gas denitrification system.
In order to solve the above-mentioned technical problem, the utility model adopts the following technical solution：
A kind of auxiliary denitrating system suitable for the coal-burning boiler start and stop stage, including be located at economizer and SCR reactors it
Between flue in a spray equipment, the spray equipment is sequentially connected a heating device and a mixer by a main pipe road；
The mixer is separately connected a H by three bye-passes2O2Storage tank, one potent dose of storage tank and a synergist storage tank, for mixing
H2O2, potent dose and synergist；The heating device is used for mixed H2O2, potent dose and synergist be heated into steam, lead to
It crosses the main pipe road and is delivered to the spray equipment, to be sprayed to flue gas in the flue；The H2O2Storage tank is also connected with one
Low-temperature control system.
Further, the main pipe road is equipped with a delivery pump.
Further, it is respectively equipped with a delivery pump on three bye-passes.
Further, flow meters are respectively equipped on three bye-passes.
Further, it is equipped with a temperature measuring equipment above the spray equipment.
Further, the connection H2O2The bye-pass of storage tank and the inner surface on the main pipe road are coated with inert material.
Further, the inert material includes silica, fluoroplastics.
Further, the direction that the nozzle of the spray equipment is flowed away towards flue gas.
This system H2O2Storage tank stores H2O2Solution, using it as denitration oxidant, in boiler start/ stop or underrun
NO in flue gas can be oxidized to high-valence state nitrogen oxides, including N2O3、NO2、N2O4And N2O5Deng flue gas after oxidation is through de-
After the processing of sulphur alkaline slurry, it is purified flue gas, the concentration of NOx in flue gas is made to reach discharge standard.Low-temperature control device is used for
Control H2O2In rational low-temperature condition, in transport of H2O2Bye-pass and the main pipe road of process are coated with inert material, can be most
Avoid reacting preceding H to big degree2O2Itself decompose.Potent dose of storage tank and synergist storage tank store potent dose and synergy respectively
Agent can be added to H2O2To strengthen H in solution2O2The oxidability to NO in flue gas, and inhibit H2O2Decomposition, to
Promote H2O2Aoxidize the efficiency of NO.Heating device heats mixed liquor, is changed into high-temperature vapour, is conducive to spray and and cigarette
Gas mixes.Temperature measuring equipment is housed above spray equipment, flue-gas temperature can be monitored, when flue-gas temperature is urged below or above SCR
When agent operating temperature, alarm can be sent out, operations staff is prompted to be turned on and off this system.This system utilizes cheap environmental protection
H2O2As denitration oxidant, can in coal-burning boiler start and stop or underrun effective existing SCR systems in assistant coal power station
System removes the NOx in flue gas, keeps NOx qualified discharges, process equipment simple.
Description of the drawings
Fig. 1 is a kind of auxiliary denitrating system schematic diagram suitable for the coal-burning boiler start and stop stage.
In figure：1-H2O2Storage tank, potent dose of storage tank of 2-, 3- synergist storage tanks, 4,5,6- flowmeters, 7,8,9,12- conveying
Pump, 10- low-temperature control systems, 11- mixers, 13- heating devices, 14- spray equipments, 15- temperature measuring equipments, 16- flues.
Specific implementation mode
Features described above and advantage to enable the utility model are clearer and more comprehensible, special embodiment below, and appended by cooperation
Figure is described in detail below.
The present embodiment discloses a kind of auxiliary denitrating system suitable for the coal-burning boiler start and stop stage, and structure is as shown in Figure 1.
11 inlet of mixer connects a H by a bye-pass2O2Storage tank 1 is disposed with a flow on the bye-pass
Meter 4 and a delivery pump 7.H2O2Storage tank 1 stores H2O2Solution is conveyed to mixing under the action of delivery pump 7 by the bye-pass
Device 11, flowmeter 4 is for detecting H2O2The flow of solution.H2O2Storage tank 1 is also connected with a low-temperature control system 10, by H2O2Solution
Temperature controls between 5~10 DEG C.
11 inlet of mixer connects one potent dose of storage tank 2 by a bye-pass, and one is disposed on the bye-pass
Flowmeter 5 and a delivery pump 8.Potent dose of storage tank 2 stores potent dose, is conveyed by the bye-pass under the action of delivery pump 8
To mixer 11, flowmeter 5 is used to detect potent dose of flow.
11 inlet of mixer connects a synergist storage tank 3 by a bye-pass, and one is disposed on the bye-pass
Flowmeter 6 and a delivery pump 9.Synergist storage tank 3 stores synergist, is conveyed by the bye-pass under the action of delivery pump 9
To mixer 11, flowmeter 6 is used to detect the flow of synergist.
For 11 liquid outlet of mixer by female one spray equipment 14 of piping connection, it is defeated on the main pipe road to be disposed with one
Send pump 12 and a heating device 13.Spray equipment 14 is located in flue 16, and a temperature measuring equipment is provided with above spray equipment 14
15.Spray equipment 14 and temperature measuring equipment 15 are arranged in the flue between economizer and SCR reactors, the injection of spray equipment 14
Direction flows away direction towards flue gas.Temperature measuring equipment 15 is used to monitor the temperature of flue gas, when flue-gas temperature is below or above 280 DEG C
When, alarm is sent out, operations staff is prompted to be turned on and off this system.
H2O2Storage tank 1 connects the inner surface coated inert material layer of the bye-pass and main pipe road of mixer 11, will not promote point
Solve H2O2With resolution hydroxyl radical free radical, inert material is silica or fluoroplastics.
H2O2Solution, potent agent solution, synergist solution are delivered to mixer 11 and form mixed oxidization liquid respectively, mix oxygen
Change liquid to be conveyed by delivery pump 12 from 11 liquid outlet of mixer, flows through heating device 13 and be changed into steam, through spray equipment 14 after
Gaseous mixture, the H in gaseous mixture are formed with the flue gas in flue 162O2The sour gas for generating and including nitrous acid and nitric acid is reacted with NOx
Body, sour gas in alkaline slurry and can be removed in subsequent desulphurization system, be purified flue gas.
In the present embodiment, parameter setting is as follows：H2O2The mass concentration of solution is 1%~10%, H2O2With in flue gas
The molar ratio of NOx is (5~20):1, the heating temperature of heating device 13 is 120~180 DEG C, and flue-gas temperature is 180~280 DEG C.
Potent dose includes NaOH, Ca (OH)2, one or more aqueous solutions in urea, Solute mass fraction is 2%~38%.Increase
Effect agent include one or more of methanol, ethyl alcohol, glycerine and n-butanol aqueous solution, Solute mass fraction be 2%~
8%.Potent dose and H2O2Volume ratio be 1:(7~10), synergist and H2O2Volume ratio be (1~5):100.
Above example is only to illustrate the technical solution of the utility model rather than is limited, this field it is common
Technical staff can be modified or replaced equivalently the technical solution of the utility model, without departing from the essence of the utility model
God and range, the scope of protection of the utility model should be subject to described in claims.
Claims (8)
1. a kind of auxiliary denitrating system suitable for the coal-burning boiler start and stop stage, which is characterized in that including being located at economizer and SCR
A spray equipment in flue between reactor, the spray equipment are sequentially connected a heating device and one by a main pipe road
Mixer；The mixer is separately connected a H by three bye-passes2O2Storage tank, one potent dose of storage tank and a synergist storage tank,
For mixing H2O2, potent dose and synergist；The heating device is used for mixed H2O2, potent dose and synergist heating
At steam, the spray equipment is delivered to by the main pipe road, to be sprayed to flue gas in the flue；The H2O2Storage
Tank is also connected with a low-temperature control system.
2. a kind of auxiliary denitrating system suitable for the coal-burning boiler start and stop stage according to claim 1, which is characterized in that
The main pipe road is equipped with a delivery pump.
3. a kind of auxiliary denitrating system suitable for the coal-burning boiler start and stop stage according to claim 1, which is characterized in that
It is respectively equipped with a delivery pump on three bye-passes.
4. a kind of auxiliary denitrating system suitable for the coal-burning boiler start and stop stage according to claim 1, which is characterized in that
It is respectively equipped with flow meters on three bye-passes.
5. a kind of auxiliary denitrating system suitable for the coal-burning boiler start and stop stage according to claim 1, which is characterized in that
A temperature measuring equipment is equipped with above the spray equipment.
6. a kind of auxiliary denitrating system suitable for the coal-burning boiler start and stop stage according to claim 1, which is characterized in that
The connection H2O2The bye-pass of storage tank and the inner surface on the main pipe road are coated with inert material.
7. a kind of auxiliary denitrating system suitable for the coal-burning boiler start and stop stage according to claim 6, which is characterized in that
The inert material includes silica, fluoroplastics.
8. a kind of auxiliary denitrating system suitable for the coal-burning boiler start and stop stage according to claim 1, which is characterized in that
The direction that the nozzle of the spray equipment is flowed away towards flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721310819.3U CN207641256U (en) | 2017-10-12 | 2017-10-12 | A kind of auxiliary denitrating system suitable for the coal-burning boiler start and stop stage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721310819.3U CN207641256U (en) | 2017-10-12 | 2017-10-12 | A kind of auxiliary denitrating system suitable for the coal-burning boiler start and stop stage |
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| CN207641256U true CN207641256U (en) | 2018-07-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110314511A (en) * | 2019-07-16 | 2019-10-11 | 上海迪夫格环境科技有限公司 | A kind of SCR denitration device cooperates with denitrification apparatus with low-temperature plasma device |
-
2017
- 2017-10-12 CN CN201721310819.3U patent/CN207641256U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110314511A (en) * | 2019-07-16 | 2019-10-11 | 上海迪夫格环境科技有限公司 | A kind of SCR denitration device cooperates with denitrification apparatus with low-temperature plasma device |
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