CN105879673A - Steel mill coke oven flue gas denitration method and device - Google Patents
Steel mill coke oven flue gas denitration method and device Download PDFInfo
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- CN105879673A CN105879673A CN201410491420.4A CN201410491420A CN105879673A CN 105879673 A CN105879673 A CN 105879673A CN 201410491420 A CN201410491420 A CN 201410491420A CN 105879673 A CN105879673 A CN 105879673A
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Abstract
The invention discloses a steel mill coke oven flue gas denitration method and device. The method comprises introducing flue gas to a SCR flue, preheating the flue gas to a temperature of about 265 DEG C through a heat exchanger, heating the flue gas to a reaction temperature of 310 DEG C, feeding the heated flue gas into a SCR reactor, fully mixing the flue gas and diluent ammonia gas, carrying out denitration through a catalyst bed, feeding the flue gas subjected to denitration into the heat exchanger, recovering waste heat and discharging the waste heat. The steel mill coke oven flue gas denitration device comprises a reducer preparation module, an ammonia dilution system module, a flue gas heating system module, an ammonia injection system module, an automatic control module and a catalytic reactor module. Before denitration, the heat exchanger is used so that the raw flue gas is preheated and thus fuel consumption in heating is reduced. The waste heat of clean flue gas is recovered so that energy is saved, flue gas NOx content is reduced to 150mg/Nm<3> from 520mg/Nm<3> and satisfies the national emission standard, an ammonia escape amount is only 3ppm and a SO2 conversion ratio is only 1%.
Description
Technical field
The invention belongs to industrial waste gas processing technology field, particularly relate to the denitration side of a kind of steel mill coke oven flue gas
Method and device.
Background technology
Along with NOx discharge sustainable growth, the country that domestic steel mill coke oven flue gas NOx emission limit value is relevant
Policy and national standard, provincial standard increasingly stringent, steel mill's coke oven flue gas denitration will include enforceable holding in
Professional etiquette model, the NOx main source in steel mill's coke oven flue gas is fuel type NOx, refers to nitrogenous oxidation in fuel
Thing, decomposes in combustion, and the most further oxidation forms NOx.To in steel mill's coke oven flue gas
NOx carries out removing and administer and has become as the whole nation or even the important environmental conservation class of steel mill of world coke oven industry
Topic.
Steel mill's coke oven flue gas denitration project is started late, the denitrating flue gas project the most do not run.
Summary of the invention
The purpose of the embodiment of the present invention is to provide method of denitration and the device of a kind of steel mill coke oven flue gas, it is intended to
Solve the denitrating technique of existing steel mill coke oven flue gas owing to coke oven flue gas temperature is too low, less than application SNCR
850-1100 DEG C of region of denitration technology, covers an area of, and investment height, heat recovery rate is low, energy consumption
High problem.
The embodiment of the present invention is achieved in that the method for denitration of a kind of steel mill coke oven flue gas, this steel mill's coke oven
Flue gas is caused activated carbon SCR (SCR) flue by the method for denitration of flue gas, makes flue gas through heat exchange
After device is preheated to about 265 DEG C, then carry out flue gas being heated to reaction temperature 310 DEG C entrance SCR reactor,
Flue gas carries out denitration with after the ammonia of dilution is sufficiently mixed by beds, and the flue gas after denitration enters
Enter after heat exchanger carries out waste heat recovery and discharge.
Further, the method for denitration of this steel mill's coke oven flue gas specifically includes following steps:
Step one, uses truck transport by reducing agent liquefied ammonia, is transported to liquid ammonia storage tank by discharging compressor,
Store in liquid form；
Step 2, gasifies through ammonia evaporator, and the ammonia after gasification enters gas ammonia surge tank, makes gas ammonia buffer
Tank outlet pressure stabilizes to 1～3MPa；
Step 3, uses dilution air extraction 2000m3The dilution wind of/h heats, and is heated to 270 DEG C of left sides
Right；
Step 4, is sufficiently mixed the dilution wind after heating in gas/ammonia blender with gas ammonia, makes ammonia
Content reaches less than 5%；
Step 5, makes flue gas preheat through heat exchanger, and temperature is increased to 265 DEG C；
Step 6, uses low NO to be heated by the flue gas after preheating, is heated to reaction temperature 310
℃；
Step 7, the ammonia making ammonia content be less than 5%/sky gaseous mixture sprays into through flue through ammonia-spraying grid, with
Through the flue gas mixing of 310 DEG C of rectification of flue gas commutator；
Step 8, after the flue gas of ammonia/sky gaseous mixture and 310 DEG C is sufficiently mixed, through catalyst, in catalysis
Under the effect of agent, reducing agent ammonia reacts with the NOx in flue gas, generates nitrogen and water；
Step 9, the flue gas after denitration after the raw flue gas of 180 DEG C is preheated by heat exchanger by drawing
Blower fan enters chimney.
The another object of the embodiment of the present invention is to provide the denitrification apparatus of a kind of steel mill coke oven flue gas, this steel mill
The denitrification apparatus of coke oven flue gas includes: reducing agent prepares module, ammonia dilution system module, flue gas heating system
Module, spray ammonia system module, automaton, catalytic reactor module；
Module prepared by reducing agent, for realizing the liquid phase ammonia conversion to vapor phase ammonia；
Ammonia dilution system module, prepares module with reducing agent and is connected, for realizing the dilution of vapor phase ammonia；
Flue gas heating system module, is connected with spray ammonia system module, for realizing the preheating of flue gas；
Spray ammonia system module, is connected with ammonia dilution system module and catalytic reactor module, is used for realizing flue gas
Mixing with ammonia/sky gaseous mixture；
Automaton, with reducing agent prepare module, ammonia dilution system module, flue gas heating system module,
Spray ammonia system module, catalytic reactor module connect, and are used for realizing flue gas flow detection, NOx, O2Detection
The control of gentle ammonia flow；
Catalytic reactor module, is connected with spray ammonia system module, is used for promoting that NOx and ammonia carry out reaction raw
Become N2And H2O。
Further, module prepared by reducing agent, including discharging compressor, liquid ammonia storage tank, liquid ammonia evaporator, gas
Ammonia surge tank；
Discharging compressor, for unloading liquefied ammonia to liquid ammonia storage tank from haulage truck；
Liquid ammonia storage tank, is connected with discharging compressor, is used for storing liquefied ammonia；
Liquid ammonia evaporator, is connected with liquid ammonia storage tank, for liquid phase ammonia is evaporated to vapor phase ammonia；
Gas ammonia surge tank, is connected with liquid ammonia evaporator, for stablizing gas ammonia pressure.
Further, ammonia dilution system module, including: dilution air, dilute wind heater, ammonia/sky blender；
Dilution air, for extracting required dilution wind；
Dilution wind heater, is connected with dilution air, is used for heating dilution wind；
Ammonia/sky blender, with dilution wind heater is connected, for by gas ammonia with heat after dilution wind mix
Closing, making gas ammonia content is less than 5%.
Further, flue gas heating system module, including heat exchanger, low NO；
Heat exchanger, for reacted clean flue gas and raw flue gas are carried out heat exchange, makes raw flue gas preheat
To 265 DEG C；
Low NO, is connected with heat exchanger, and the raw flue gas after heating preheating is to reaction temperature 310
℃。
Further, ammonia system module is sprayed, including ammonia-spraying grid, flue gas commutator；
Ammonia-spraying grid, is used for making ammonia/sky gaseous mixture spray uniformly to flue；
Flue gas commutator, is connected with ammonia-spraying grid, the most mixed for the flue gas making ammonia/sky gaseous mixture and 310 DEG C
Merge and ensure that its flow direction is perpendicular to catalyst.
Further, automaton, including flue gas flow detecting system, NOx, O2Detecting system, gas
Ammonia flow control system；
Flue gas flow detecting system, is used for detecting flue gas flow；
NOx、O2Detecting system, is used for detecting reactor inlet and outlet NOx and O2Content；
Gas ammonia flow control system, for by by NOx, O2The detected value of detecting system and flue gas flow
After detected value calculates, the strict flow controlling gas ammonia.
Further, catalyst reaction module, including catalyst；
Catalyst, is used for promoting that NOx and ammonia carry out reaction and generate N2And H2O。
The method of denitration of steel mill's coke oven flue gas that the present invention provides and device, flue gas can use air inducing from flue
Flue gas is caused SCR reactor by machine, and flue gas heating system is combined manufacture with SCR reactor, reduces pipe
Road connects, and makes whole SCR characteristics of compact layout, and system equipment is an entirety from the appearance, greatly reduces and accounts for
Ground area, decreases investment.Before denitration, increase heat transmission equipment, raw flue gas can be preheated, joint
The fuel consumed when saving heating, it is also possible to reclaimed by the waste heat of clean flue gas, saves the energy, finally may be used
Make in flue gas NOx content by 520mg/Nm3It is removed to 150mg/Nm3, reach national requirements discharge standard,
Ensure that the escaping of ammonia only has 3ppm, SO simultaneously2Conversion ratio is also only 1%.
Accompanying drawing explanation
Fig. 1 is the method for denitration flow chart of steel mill's coke oven flue gas that the embodiment of the present invention provides；
Fig. 2 is the flow chart of the method for denitration embodiment of steel mill's coke oven flue gas that the embodiment of the present invention provides；
Fig. 3 is the structural representation of the denitrification apparatus of steel mill's coke oven flue gas that the embodiment of the present invention provides；
In figure: 1, module prepared by reducing agent；1-1, discharging compressor；1-2, liquid ammonia storage tank；1-3, liquefied ammonia
Vaporizer；1-4, gas ammonia surge tank；2, ammonia dilution system module；2-1, dilution air；2-2, dilution wind
Heater；2-3, ammonia/sky blender；3, flue gas heating system module；3-1, heat exchanger；3-2, low nitrogen
Burner；4, spray ammonia system module；4-1, ammonia-spraying grid；4-2, flue gas commutator；5, catalytic reaction
Device module.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment,
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to
Explain the present invention, be not intended to limit the present invention.
Below in conjunction with the accompanying drawings and the application principle of the present invention is further described by specific embodiment.
As it is shown in figure 1, the method for denitration of steel mill's coke oven flue gas of the embodiment of the present invention comprises the following steps:
S101: reducing agent liquefied ammonia is used truck transport, is transported to liquid ammonia storage tank by discharging compressor, with
Liquid form stores；
S102: gasify through ammonia evaporator, the ammonia after gasification enters gas ammonia surge tank, makes gas ammonia surge tank
Outlet pressure stabilizes to 1～3MPa；
S103: use dilution air extraction 2000m3The dilution wind of/h heats, and is heated to about 270 DEG C；
S104: the dilution wind after heating is sufficiently mixed with gas ammonia in gas/ammonia blender, makes containing of ammonia
Amount reaches less than 5%；
S105: make flue gas preheat through heat exchanger, temperature is increased to about 265 DEG C；
S106: use low NO to be heated by the flue gas after preheating, be heated to reaction temperature 310 DEG C；
S107: the ammonia making ammonia content be less than 5%/sky gaseous mixture sprays into through flue through ammonia-spraying grid, with warp
Cross the flue gas mixing of 310 DEG C of rectification of flue gas commutator；
After the flue gas of S108: ammonia/sky gaseous mixture and 310 DEG C is sufficiently mixed, through catalyst, at catalyst
Effect under, reducing agent ammonia reacts with the NOx in flue gas, generates nitrogen and water；
S109: the flue gas after denitration passes through air inducing after the raw flue gas of 180 DEG C is preheated by heat exchanger
Machine enters chimney.
Flue gas (referring to table 1) is caused SCR cigarette by the denitrating technique of steel mill's coke oven flue gas of the embodiment of the present invention
Road, makes flue gas after heat exchanger is preheated to about 265 DEG C, then carries out being heated to reaction temperature by flue gas
310 DEG C enter SCR reactor, and flue gas is entered by beds with after the ammonia of dilution is sufficiently mixed
Row denitration, the flue gas after denitration enters after heat exchanger carries out waste heat recovery and discharges.
Table 1 Gas Parameters
| Project | Unit | Quantity |
| Flue gas flow | Nm3/h | 400,000 |
| Flue-gas temperature | ℃ | 180 (fluctuation ranges 170～210) |
| Flue gas pressures | kPa(g) | 0.5 |
| Smoke components | ||
| CO | Mol% | 0.0112 |
| CO2 | Mol% | 25.7965 |
| H2O | Mol% | 7.1491 |
| N2 | Mol% | 66.9707 |
| NO2 | Mol% | 0.0282 |
| O2 | Mol% | 0.0011 |
| SO2 | Mol% | 0.0006 |
| NOx | mg/Nm3 | 520 (100～580) |
| Particulate matter | mg/Nm3 | 8 (5～15) |
As in figure 2 it is shown, the concretely comprising the following steps of the embodiment of the present invention: reducing agent uses truck transport, by unloading
Material compressor is transported to ammonia storage tank, and the ammonia stored in liquid form is before injecting boiler, through ammonia evaporator gas
Changing, the air of the ammonia after gasification and air compressor mixes in a mixer, through ammonia-spraying grid spray into through
Crossing flue, mix with the flue gas after the heating of flue gas commutator, after being sufficiently mixed, reducing agent is being urged
The effect of agent is lower reacts with the NOx in flue gas, generates nitrogen and water, and the flue gas after denitration is through heat exchanger
Chimney is entered after raw flue gas is preheated.
As it is shown on figure 3, the denitrification apparatus of steel mill's coke oven flue gas of the embodiment of the present invention is mainly by reducing agent system
For module 1, ammonia dilution system module 2, flue gas heating system module 3, spray ammonia system module 4, automatically control
Device processed, catalytic reactor module 5；
Module 1 prepared by reducing agent, for realizing the liquid phase ammonia conversion to vapor phase ammonia；
Ammonia dilution system module 2, prepares module 1 and is connected with reducing agent, for realizing the dilution of vapor phase ammonia；
Flue gas heating system module 3, ammonia dilution system module 2 connects, for realizing the preheating of flue gas；
Spray ammonia system module 4, is connected with ammonia dilution system module 2 and catalytic reactor module 6, for real
Existing flue gas and the mixing of ammonia/sky gaseous mixture；
Automaton, prepares module 1, ammonia dilution system module 2, flue gas heating system mould with reducing agent
Block 3, spray ammonia system module 4, catalytic reactor module 5 connect, be used for realizing flue gas flow detection, NOx,
O2Detect the control of gentle ammonia flow；
Catalytic reactor module 5, is connected with spray ammonia system module 4, is used for promoting that NOx and ammonia are carried out instead
N should be generated2And H2O。
Module 1 prepared by reducing agent, including discharging compressor 1-1, liquid ammonia storage tank 1-2, liquid ammonia evaporator 1-3,
Gas ammonia surge tank 1-4；
Discharging compressor 1-1, for unloading liquefied ammonia to liquid ammonia storage tank 1-2 from haulage truck；
Liquid ammonia storage tank 1-2, is connected with discharging compressor 1-1, is used for storing liquefied ammonia；
Liquid ammonia evaporator 1-3, is connected with liquid ammonia storage tank 1-2, for liquid phase ammonia is evaporated to vapor phase ammonia；
Gas ammonia surge tank 1-4, is connected with liquid ammonia evaporator 1-3, for stablizing gas ammonia pressure；
Ammonia dilution system module 2, including: dilution air 2-1, dilute wind heater 2-2, ammonia/sky blender
2-3；
Dilution air 2-1, for extracting required dilution wind；
Dilution wind heater 2-2, is connected with dilution air 2-1, is used for heating dilution wind；
Ammonia/sky blender 2-3, is connected with dilution wind heater 2-2, for by the dilution after gas ammonia and heating
Wind mixes, and making gas ammonia content is less than 5%；
Flue gas heating system module 3, including heat exchanger 3-1, low NO 3-2；
Heat exchanger 3-1, for reacted clean flue gas and raw flue gas are carried out heat exchange, makes raw flue gas
It is preheated to about 265 DEG C；
Low NO 3-2, is connected with heat exchanger 3-1, and the raw flue gas after heating preheating is to reacting temperature
Spend 310 DEG C；
Spray ammonia system module 4, including ammonia-spraying grid 4-1, flue gas commutator 4-2；
Ammonia-spraying grid 4-1, is used for making ammonia/sky gaseous mixture spray uniformly to flue；
Flue gas commutator 4-2, is connected with ammonia-spraying grid 4-1, for making ammonia/sky gaseous mixture and the flue gas of 310 DEG C
It is sufficiently mixed and ensures that its flow direction is perpendicular to catalyst；
Automaton, including flue gas flow detecting system, NOx, O2Detecting system, gas ammonia flow control
System processed；
Flue gas flow detecting system, is used for detecting flue gas flow；
NOx、O2Detecting system, is used for detecting reactor inlet and outlet NOx and O2Content；
Gas ammonia flow control system, for by by NOx, O2The detected value of detecting system and flue gas flow
After detected value calculates, the strict flow controlling gas ammonia；
Catalyst reaction module 5, including catalyst；
Catalyst, is used for promoting that NOx and ammonia carry out reaction and generate N2And H2O。
The operation principle of the present invention:
In the present invention, flue gas can use air-introduced machine that flue gas causes SCR reactor from flue, is added by flue gas
Hot systems is combined manufacture with SCR reactor, makes whole SCR characteristics of compact layout, and floor space reduces, and also subtracts
Lack investment.Before denitration, increase heat transmission equipment, raw flue gas can be preheated, consume when saving heating
Fuel, it is also possible to the waste heat of clean flue gas is reclaimed, save the energy.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Any amendment, equivalent and the improvement etc. made within bright spirit and principle, should be included in the present invention
Protection domain within.
Claims (9)
1. the method for denitration of steel mill's coke oven flue gas, it is characterised in that the denitration side of this steel mill's coke oven flue gas
Flue gas is caused SCR flue by method, makes flue gas after heat exchanger is preheated to 265 DEG C, then is added by flue gas
Heat to reaction temperature 310 DEG C enters SCR reactor, and flue gas passes through with after the ammonia of dilution is sufficiently mixed
Beds carries out denitration, and the flue gas after denitration enters after heat exchanger carries out waste heat recovery and discharges.
2. the method for denitration of steel mill as claimed in claim 1 coke oven flue gas, it is characterised in that this steel mill is burnt
The method of denitration of kiln gas specifically includes following steps:
Step one, uses truck transport by reducing agent liquefied ammonia, is transported to liquid ammonia storage tank by discharging compressor,
Store in liquid form；
Step 2, gasifies through ammonia evaporator, and the ammonia after gasification enters gas ammonia surge tank, makes gas ammonia buffer
Tank outlet pressure stabilizes to 1～3MPa；
Step 3, uses dilution air extraction 2000m3The dilution wind of/h heats, and is heated to 270 DEG C；
Step 4, is sufficiently mixed the dilution wind after heating in gas/ammonia blender with gas ammonia, makes ammonia
Content reaches less than 5%；
Step 5, makes flue gas preheat through heat exchanger, and temperature is increased to 265 DEG C；
Step 6, uses low NO to be heated by the flue gas after preheating, is heated to reaction temperature 310
℃；
Step 7, the ammonia making ammonia content be less than 5%/sky gaseous mixture sprays into through flue through ammonia-spraying grid, with
Through the flue gas mixing of 310 DEG C of rectification of flue gas commutator；
Step 8, after the flue gas of ammonia/sky gaseous mixture and 310 DEG C is sufficiently mixed, through catalyst, in catalysis
Under the effect of agent, reducing agent ammonia reacts with the NOx in flue gas, generates nitrogen and water；
Step 9, the flue gas after denitration after the raw flue gas of 180 DEG C is preheated by heat exchanger by drawing
Blower fan enters chimney.
3. the denitrification apparatus of steel mill's coke oven flue gas, it is characterised in that the denitration dress of this steel mill's coke oven flue gas
Put and include: reducing agent prepares module, ammonia dilution system module, flue gas heating system module, spray ammonia system mould
Block, automaton, catalytic reactor module；
Module prepared by reducing agent, for realizing the liquid phase ammonia conversion to vapor phase ammonia；
Ammonia dilution system module, prepares module with reducing agent and is connected, for realizing the dilution of vapor phase ammonia；
Flue gas heating system module, is connected with spray ammonia system module, for realizing the preheating of flue gas；
Spray ammonia system module, is connected with ammonia dilution system module and catalytic reactor module, is used for realizing flue gas
Mixing with ammonia/sky gaseous mixture；
Automaton, with reducing agent prepare module, ammonia dilution system module, flue gas heating system module,
Spray ammonia system module, catalytic reactor module connect, and are used for realizing flue gas flow detection, NOx, O2Detection
The control of gentle ammonia flow；
Catalytic reactor module, is connected with spray ammonia system module, is used for promoting that NOx and ammonia carry out reaction raw
Become N2And H2O。
4. the denitrification apparatus of steel mill as claimed in claim 3 coke oven flue gas, it is characterised in that reducing agent system
Standby module, including discharging compressor, liquid ammonia storage tank, liquid ammonia evaporator, gas ammonia surge tank；
Discharging compressor, for unloading liquefied ammonia to liquid ammonia storage tank from haulage truck；
Liquid ammonia storage tank, is connected with discharging compressor, is used for storing liquefied ammonia；
Liquid ammonia evaporator, is connected with liquid ammonia storage tank, for liquid phase ammonia is evaporated to vapor phase ammonia；
Gas ammonia surge tank, is connected with liquid ammonia evaporator, for stablizing gas ammonia pressure.
5. the denitrification apparatus of steel mill as claimed in claim 3 coke oven flue gas, it is characterised in that ammonia dilution is
System module, including: dilution air, dilute wind heater, ammonia/sky blender；
Dilution air, for extracting required dilution wind；
Dilution wind heater, is connected with dilution air, is used for heating dilution wind；
Ammonia/sky blender, with dilution wind heater is connected, for by gas ammonia with heat after dilution wind mix
Closing, making gas ammonia content is less than 5%.
6. the denitrification apparatus of steel mill as claimed in claim 3 coke oven flue gas, it is characterised in that flue gas
System module, including heat exchanger, low NO；
Heat exchanger, for reacted clean flue gas and raw flue gas are carried out heat exchange, makes raw flue gas preheat
To 265 DEG C；
Low NO, is connected with heat exchanger, and the raw flue gas after heating preheating is to reaction temperature 310
℃。
7. the denitrification apparatus of steel mill as claimed in claim 3 coke oven flue gas, it is characterised in that spray ammonia system
Module, including ammonia-spraying grid, flue gas commutator；
Ammonia-spraying grid, is used for making ammonia/sky gaseous mixture spray uniformly to flue；
Flue gas commutator, is connected with ammonia-spraying grid, the most mixed for the flue gas making ammonia/sky gaseous mixture and 310 DEG C
Merge and ensure that the flow direction is perpendicular to catalyst.
8. the denitrification apparatus of steel mill as claimed in claim 3 coke oven flue gas, it is characterised in that automatically control
Device, including flue gas flow detecting system, NOx, O2Detecting system, gas ammonia flow control system；
Flue gas flow detecting system, is used for detecting flue gas flow；
NOx、O2Detecting system, is used for detecting reactor inlet and outlet NOx and O2Content；
Gas ammonia flow control system, for by by NOx, O2The detected value of detecting system and flue gas flow
After detected value calculates, the strict flow controlling gas ammonia.
9. the denitrification apparatus of steel mill as claimed in claim 3 coke oven flue gas, it is characterised in that catalyst is anti-
Answer module, including catalyst；
Catalyst, is used for promoting that NOx and ammonia carry out reaction and generate N2And H2O。
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| CN201410491420.4A CN105879673A (en) | 2014-09-24 | 2014-09-24 | Steel mill coke oven flue gas denitration method and device |
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| CN106401716A (en) * | 2016-11-09 | 2017-02-15 | 郑丹 | Tail gas denitration device of natural gas internal combustion engine generator |
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| CN113680206A (en) * | 2021-08-19 | 2021-11-23 | 成都达奇环境科技有限公司 | Control method and system of catalytic denitration equipment |
| CN114887484A (en) * | 2022-05-30 | 2022-08-12 | 山东道简环保科技有限公司 | Circulating waste heat coupling type SCR denitration system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401716A (en) * | 2016-11-09 | 2017-02-15 | 郑丹 | Tail gas denitration device of natural gas internal combustion engine generator |
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