CN208542022U - Incineration flue gas non-catalytic reduction denitrating system based on high concentration reducing agent - Google Patents
Incineration flue gas non-catalytic reduction denitrating system based on high concentration reducing agent Download PDFInfo
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- CN208542022U CN208542022U CN201821143508.7U CN201821143508U CN208542022U CN 208542022 U CN208542022 U CN 208542022U CN 201821143508 U CN201821143508 U CN 201821143508U CN 208542022 U CN208542022 U CN 208542022U
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- reducing agent
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Abstract
The utility model discloses a kind of incineration flue gas non-catalytic reduction denitrating system based on high concentration reducing agent, including reducing agent preparation and conveying device (1), reducing agent atomizing lance (2), escape ammonia absorber (3), circulator (4) and pH regulating device (5)；Reducing agent atomizing lance is located on waste heat boiler (12) first passage water-cooling wall, and reducing agent preparation and conveying device liquid outlet connect reducing agent atomizing lance inlet, and escape ammonia absorber air inlet connects deduster (31) gas outlet；First dosing unit liquid outlet of pH regulating device passes through circulator even escape ammonia absorber inlet, pH regulating device injects sig water (5-2) in waste water (40) by the second dosing unit, and outlet enters waste water treatment system (9) or liquid dangerous waste storage tank (11) after reaction.The utility model can efficiently remove NOx under conditions of Low investment and low cost, reach and be better than the flue gas emission requirement of national Specification.
Description
Technical field
The utility model relates to a kind of incineration flue gas denitrating system more particularly to a kind of burnings based on high concentration reducing agent
Flue gas non-catalytic reduction denitrating system.
Background technique
Incineration disposal is a kind of waste common efficient innoxious, minimizing, recycling means, general using revolution
Kiln puts into auxiliary fuel, burns to waste, using the heat in waste heat boiler recovered flue gas as incinerator form.
The flue gas that pollution of the castoff burning factory to atmosphere, mainly incinerator are discharged.Domestic danger wastes burn
Design, construction and the operation of factory, according to pertinent regulations, waste discharge executes national standard " dangerous waste incineration contamination control mark
It is quasi- " (GB18484-2001).
China's dangerous waste incineration technology develops slowly, and technology and standard are also being groped in forming process, and such as: dangerous waste is burnt
Performed discharge standard " dangerous waste incineration contamination control standard " (GB18484-2001) is burnt to put into effect very early, in national environmental protection
It is required that more strict standard will be carried out shortly after under increasingly stringent situation.Compared to Europe, domestic dangerous waste discharged in burning mark
Quasi- more loose, it is imperative that discharge standard is drawn close to international standard, and the new projects of Some Domestic high standard are all made of
2000 discharge standard of European Union is required.
The dangerous waste relevant emission standards data in China and Europe are as follows:
In the dangerous waste incineration system run at present:
For requiring to set according to discharged nitrous oxides in " dangerous waste incineration contamination control standard " (GB18484-2001)
The denitrating system of meter, the selective non-catalytic reduction system for mostly using tradition similar with coal-burning boiler, the denitrfying agent concentration of penetrating
It is lower, according to the requirement of Thermal Power Generation Industry national regulation, the ammonia concn in boiler is sprayed into less than 5%, every profession and trade still continues to use low concentration
Denitrfying agent carries out denitration, and denitration efficiency is generally below 50%.
For the denitrating system designed according to tightened up discharge standard, middle low-temperature selective catalytic reduction system is mostly used,
Although denitration efficiency is up to 90%, the catalyst of middle low-temperature SCR system is expensive, and every 3-4 need to just carry out catalyst
Replacement, the dead catalyst of generation are a kind of dangerous solid waste of national regulation, and catalyst price and its valuableness, so should
System equipment investment is big, operating cost is high, brings very big financial burden for dangerous waste burning disposal enterprise.
Summary of the invention
The incineration flue gas non-catalytic reduction denitration based on high concentration reducing agent that the purpose of this utility model is to provide a kind of
System can efficiently remove NOx under conditions of low equipment investment and low operating cost, reach and better than national Specification
Flue gas emission requirement, denitration efficiency can reach 85-90%；Meanwhile there is process simplification, structurally reasonable, applicable reliable, reduction to throw
The advantages that money and control operating cost, the selective catalytic reduction that investment is big, operating cost is high, has dead catalyst to generate can be replaced
Denitrating system.
The utility model is realized in this way:
A kind of incineration flue gas non-catalytic reduction denitrating system based on high concentration reducing agent, including reducing agent preparation and conveying
Device, reducing agent atomizing lance, escape ammonia absorber, circulator and pH regulating device；More than flue gas from dual firing chamber enters
In heat boiler, reducing agent atomizing lance is arranged on the water-cooling wall of waste heat boiler first passage, reducing agent preparation and conveying device
Liquid outlet connect with the inlet of reducing agent atomizing lance, reducing agent preparation and conveying device preparation high concentration reducing agent and defeated
It is sent in reducing agent atomizing lance；High concentration reducing agent by reducing agent atomizing lance spray into waste heat boiler in and in flue gas
Nitrogen oxides is reacted, and the air inlet for ammonia absorber of escaping and the gas outlet of deduster connect, and the flue gas after making reaction enters
It escapes in ammonia absorber；The liquid outlet of first dosing unit of pH regulating device by circulator and escape ammonia absorber into
Absorbing liquid is sprayed into escape ammonia absorber and carries out ammonia recycle removing by the connection of liquid mouth, pH regulating device, passes through qualified flue gas
Efficient depickling takes off white heater and is discharged through air-introduced machine from chimney；PH regulating device passes through the liquid outlet of the second dosing unit outside
Sig water is injected in the waste water of row, outlet enters waste water treatment system or liquid dangerous waste storage tank after waste water is reacted with sig water.
The utility model compared with prior art, has the following beneficial effects:
1, the utility model is sprayed using high concentration reducing agent and is combined with ammonia absorption, can be greatly improved and be taken off to nitrogen oxides
Except efficiency meets more stringent international standard limit of smog release, is for the country better than the standard limit of smog release of dangerous waste incineration plant
Newly-built or technological transformation incineration plant flue gas denitrification system engineering had into promotional value.
2, for needing to improve the old factory of denitration efficiency, the utility model is easier to realize in original selective non-catalytic reduction
Technological transformation in system, technical solution, equipment purchase, transformation the duration and in terms of have a clear superiority.
3, the implementation whole process of the utility model is without secondary pollution, and waste water can be in incineration plant inter-process, no dead catalyst etc.
The waste of processing need to be transported outward.
4, the system of the utility model is in totally-enclosed working condition, and simple for structure, process is smooth, easy to operate, environment
Completely, meet the actual state of incineration plant operation.
The utility model can efficiently remove NOx under conditions of low equipment investment and low operating cost, reach and better than state
Flue gas emission requirement, denitration efficiency as defined in family's standard can reach 85-90%；Meanwhile there is process simplification, structurally reasonable, applicable
Reliably, the advantages that reducing investment and control operating cost, the choosing that investment is big, operating cost is high, has dead catalyst to generate can be replaced
The catalytic-reduction denitrified system of selecting property.
Detailed description of the invention
Fig. 1 is the structural representation of incineration flue gas non-catalytic reduction denitrating system of the utility model based on high concentration reducing agent
Figure；
Fig. 2 is the flow chart of incineration flue gas non-catalytic reduction denitrating technique of the utility model based on high concentration reducing agent.
In figure, the preparation of 1 reducing agent and conveying device, 2 reducing agent atomizing lances, 3 escape ammonia absorbers, 4 circulator, 5
PH regulating device, 6 efficient depicklings take off white heater, 7 air-introduced machines, 8 chimneys, 9 waste water treatment systems, 10 flue gases, 11 liquid dangerous wastes
Storage tank, 12 waste heat boilers, 13 chilling towers, 1-1 urea granules or concentrated ammonia liquor, 1-2 demineralized water, 20 clean flue gas, 2-1 compression are empty
Gas, 2-2 high concentration reducing agent, 30 qualified flue gases, 31 dedusters, 40 waste water, 5-1 absorbing liquid, 5-2 sig water.
Specific embodiment
The utility model is described in further detail in the following with reference to the drawings and specific embodiments.
Refer to attached drawing 1 and attached drawing 2, a kind of incineration flue gas non-catalytic reduction denitrating system based on high concentration reducing agent,
Including reducing agent preparation and conveying device 1, reducing agent atomizing lance 2, escape ammonia absorber 3, circulator 4 and pH regulating device
5；Flue gas 10 from dual firing chamber enters in waste heat boiler 12, and reducing agent atomizing lance 2 is arranged in 12 first passage of waste heat boiler
Water-cooling wall on, reducing agent preparation and the liquid outlet of conveying device 1 are connect with the inlet of reducing agent atomizing lance 2, reducing agent
Preparation and conveying device 1 prepare high concentration reducing agent 2-2 and are transported in reducing agent atomizing lance 2；High concentration reducing agent 2-2 is also
Former agent atomizing lance 2 is sprayed into waste heat boiler 12 and is reacted with the nitrogen oxides in flue gas 10, escape ammonia absorber 3 into
Port is connect with the gas outlet of deduster 31, and the clean flue gas 20 after making reaction enters in escape ammonia absorber 3；PH regulating device
The liquid outlet of 5 the first dosing unit is connect by circulator 4 with the inlet for ammonia absorber 3 of escaping, and pH regulating device 5 will
Absorbing liquid 5-1 is sprayed into escape ammonia absorber 3 and is carried out ammonia recycle removing, and qualified flue gas 30 is made to pass through efficient depickling, Tuo Baijia
Hot device 6 is discharged through air-introduced machine 7 from chimney 8；PH regulating device 5 is by the liquid outlet of the second dosing unit in the waste water 40 of outlet
Sig water 5-2 is injected, outlet enters the waste water treatment system 9 with NH_3-N treating ability after waste water 40 is reacted with sig water 5-2
It is handled, or is discharged into liquid dangerous waste storage tank 11, be passed in rotary kiln and burn.
Attached drawing 2 is referred to, incineration flue gas non-catalytic reduction denitrating system of the utility model based on high concentration reducing agent
Technique includes the following steps:
Step 1: configuring high concentration reducing agent 2-2 in reducing agent preparation and conveying device 1, and be input to reducing agent atomization
Spray gun 2.
Step 2: flue gas 10 enter waste heat boiler 12 in, reducing agent atomizing lance 2 by compressed air 2-1 by high concentration also
Former agent 2-2, which is sprayed into waste heat boiler 12 and react with the nitrogen oxides in flue gas 10, generates clean flue gas 20.
Step 3: the clean flue gas 20 after reaction enters escape ammonia absorption tower 3, pH regulating device 5 after the processing of deduster 31
The first dosing unit by the circulatory system 4 by absorbing liquid 5-1 put into escape ammonia absorber 3, excess is carried out to clean flue gas 20
Ammonia removing processing and outlet.
Second dosing unit of step 4:pH regulating device 5 puts into sig water 5-2 into the waste water 40 of outlet, and waste water 40 is anti-
Pump outlet should be passed through afterwards.
In the step 3, through excessive ammonia removing, treated that qualified flue gas 30 enters efficient depickling, takes off white heating
Device 6 is discharged by air-introduced machine 7 through chimney 8 after depickling and Tuo Bai heating.
In the step 4, the waste water 40 of outlet, which enters after waste water treatment system 9 or liquid dangerous waste storage tank 11, to be sent to returning
It is burned in rotary kiln.
In the step 1, high concentration reducing agent 2-2 be urea granules or concentrated ammonia liquor 1-1 mixed with demineralized water 1-2 and
At making the concentration > 20% of high concentration reducing agent 2-2, the concentration of high concentration reducing agent 2-2 is higher, and denitration efficiency is also higher, urea
The ratio of particle or concentrated ammonia liquor 1-1 and demineralized water 1-2 can match as needed, after the atomization of reducing agent atomizing lance 2 more than penetrating
Inside heat boiler 12, in 1100 DEG C or so progress reduction reactions, nitrogen oxides in flue gas 10 is reduced into nitrogen, reaction mechanism is same
Common selective non-catalytic reduction technique.
According to initial nitrous oxides concentration and required removal efficiency in flue gas 10, the concentration of high concentration reducing agent 2-2 can
It is adjusted, it is preferred that the concentration of high concentration reducing agent 2-2 is generally 20%-40%.
In the step 3, dilute hydrochloric acid is can be used in absorbing liquid 5-1, is removed to the excess ammonia in clean flue gas 20
Processing, concentration, the pH value of dilute hydrochloric acid can need to set, make in dilute hydrochloric acid and following after escape ammonia solid/liquid/gas reactions according to actual use
Ring liquid pH value is controlled in 6-6.5 or so, finally carries out waste water outlet according to the salinity of absorbing liquid 5-1.
In the step 4, sodium hydroxide solution is can be used in sig water 5-2, is neutralized heel row to waste water 40
It puts, concentration, the pH value of sodium hydroxide solution can need to set according to actual use, make the waste water after reacting with sig water 5-2
40 pH value controls between 7-8.
In the step 2, when the nitrous oxides concentration in flue gas 10 is 1000mg/Nm3, and denitration efficiency is 85-
When 90%, the dosage of high concentration reducing agent 2-2 and the molar ratio of the amount of nitrogen oxides in flue gas 10 are controlled in 1.8-2.0, and ammonia is escaped
Concentration of escaping is about 240mg/Nm3。
Reducing agent atomizing lance 2 plays a part of to be atomized reducing agent, the cloth set on waste heat boiler 12 in the present system
The progress for the temperature optimum denitration reaction that high concentration reducing agent 2-2 can be made to spray into region is set, this is the weight for influencing denitration efficiency
Want link.Reducing agent atomizing lance 2 can be made of gun body and double fluid atomization nozzle, and 316L stainless steel material can be used in gun body,
310S stainless steel material can be used in double fluid atomization nozzle.
Reducing agent atomizing lance 2 is arranged on the water-cooling wall of 12 first passage of waste heat boiler, and the position flue-gas temperature is about
1100 DEG C, be the optimum temperature window of denitration reduction reaction.Compressed air 2-1 and high concentration reducing agent 2-2 respectively enter reduction
In agent atomizing lance 2, high concentration reducing agent 2-2 is atomized by the fine droplet for 5-10 μm by double fluid atomization nozzle, with
When flue gas 10 contacts, moisture evaporates rapidly, and excessive reductant is reacted with the nitrogen oxides in flue gas 10, generates nitrogen, mistake
It measures reducing agent and enters back segment treatment process with clean flue gas 20 in the form of ammonia.
The escape ammonia absorber 3 is that the wet absorption tower of a kind of fair current or adverse current is anti-for absorbing excessive ammonia
Device is answered, packed tower or spray column can be used.According to packed tower, then the selection of filler is more crucial, must guarantee at 75 DEG C or so
At a temperature of keep intensity, prevent mode brittle, and there is suitable specific surface area and liquid flooding filter.According to spray column, then must
Arrangement of nozzles and the spraying layer number of plies are rationally designed, and demister is set at the top of reaction tower.Escape ammonia absorber 3
Glass steel material or carbon steel anti-corrosion material can be used in shell, the removal for gaseous pollutant soluble in clean flue gas 20.
Flue gas in waste heat boiler 12 enters deduster 31 in such a way that chilling tower 13 is using dry powder injection and is dusted
Dry method or semidry method depickling and sack cleaner can be used in processing, deduster 31, the clean flue gas 20 handled by deduster 31
It is come into full contact in the present system with the faintly acid absorbing liquid 5-1 of circulation, absorbs the ammonia in clean flue gas 20, form soluble-salt
It is enriched in absorbing liquid 5-1, the ammonia concentration in qualified flue gas 30 is made to meet discharge standard requirement, absorbing liquid 5-1 is stored in this
In the liquid storage section of system lower part.
Circulator 4 is mainly used for the conveying and outlet of absorbing liquid 5-1, mainly by circulating pump and associated pipe, valve group
At the part contacted in circulator 4 with absorbing liquid 5-1 should all select resistant material, it is preferred that centrifugation can be used in circulating pump
Pump.
PH regulating device 5 is mainly used for adjusting the pH value of absorbing liquid 5-1, and there are two independent dosing lists for pH regulating device 5
Member, process flow are respectively as follows: a) acid storage tank → dosing pump → escape ammonia absorber 3, the removing for excessive ammonia；B) alkali stores up
Tank → dosing pump → outlet circulation fluid, the acidity for efflux wastewater 40 neutralize.Two dosing units are carried out by independent pH meter
Control, can respectively be adjusted the pH value of emission of substance, avoid environmental pollution.
The above is only the preferred embodiments of the present utility model only, is not intended to limit the protection scope of utility model, because
This, any modification, equivalent substitution, improvement and etc. made within the spirit and principle of the present invention should be included in this
Within the protection scope of utility model.
Claims (1)
1. a kind of incineration flue gas non-catalytic reduction denitrating system based on high concentration reducing agent, it is characterized in that: including reducing agent system
Standby and conveying device (1), reducing agent atomizing lance (2), escape ammonia absorber (3), circulator (4) and pH regulating device (5)；
Flue gas (10) enters in waste heat boiler (12), and the water cooling in waste heat boiler (12) first passage is arranged in reducing agent atomizing lance (2)
On wall, the liquid outlet of reducing agent preparation and conveying device (1) is connect with the inlet of reducing agent atomizing lance (2), reducing agent system
Standby and conveying device (1) preparation high concentration reducing agent (2-2) is simultaneously transported in reducing agent atomizing lance (2)；High concentration reducing agent
(2-2) is sprayed into waste heat boiler (12) by reducing agent atomizing lance (2) and is reacted with the nitrogen oxides in flue gas (10),
The air inlet of escape ammonia absorber (3) is connect with the gas outlet of deduster (31), and the clean flue gas (20) after making reaction, which enters, to be escaped
It escapes in ammonia absorber (3)；The liquid outlet of first dosing unit of pH regulating device (5) is inhaled by circulator (4) and escape ammonia
The inlet connection of tower (3) is received, absorbing liquid (5-1) is sprayed into the interior ammonia that carries out of escape ammonia absorber (3) and followed by pH regulating device (5)
Ring removing, make qualified flue gas (30) by efficient depickling, take off white heater (6) through air-introduced machine (7) from chimney (8) discharge；PH tune
Regulating device (5) injects sig water (5-2) in the waste water (40) of outlet by the liquid outlet of the second dosing unit, waste water (40) with
Outlet enters waste water treatment system (9) or liquid dangerous waste storage tank (11) after sig water (5-2) reaction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821143508.7U CN208542022U (en) | 2018-07-19 | 2018-07-19 | Incineration flue gas non-catalytic reduction denitrating system based on high concentration reducing agent |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821143508.7U CN208542022U (en) | 2018-07-19 | 2018-07-19 | Incineration flue gas non-catalytic reduction denitrating system based on high concentration reducing agent |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108671736A (en) * | 2018-07-19 | 2018-10-19 | 上海市机电设计研究院有限公司 | Incineration flue gas non-catalytic reduction denitrating technique and system based on high concentration reducing agent |
| CN111068502A (en) * | 2020-02-24 | 2020-04-28 | 上海三融环保工程有限公司 | Ammonia escape control system and control method |
-
2018
- 2018-07-19 CN CN201821143508.7U patent/CN208542022U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108671736A (en) * | 2018-07-19 | 2018-10-19 | 上海市机电设计研究院有限公司 | Incineration flue gas non-catalytic reduction denitrating technique and system based on high concentration reducing agent |
| CN111068502A (en) * | 2020-02-24 | 2020-04-28 | 上海三融环保工程有限公司 | Ammonia escape control system and control method |
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