CN205550037U - Device of outer oxidative desulfurization denitration of ammonia process - tower - Google Patents
Device of outer oxidative desulfurization denitration of ammonia process - tower Download PDFInfo
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- CN205550037U CN205550037U CN201620214329.2U CN201620214329U CN205550037U CN 205550037 U CN205550037 U CN 205550037U CN 201620214329 U CN201620214329 U CN 201620214329U CN 205550037 U CN205550037 U CN 205550037U
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- tower
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- denitration
- external oxidation
- oxidation
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Abstract
The utility model discloses a device of ammonia process of desulfurization denitration simultaneously, the device include the outer hopcalite canister of oxidation spray set, SOx/NOx control tower and tower, and SOx/NOx control tower top -down can be divided into circulation liquid bath at the bottom of demisting section, water spray section, washing layer, desulfurization section, denitration section and the tower. The flue gas oxidation spray set that at first flows through, the lower part from the SOx/NOx control tower gets into the denitration section of flowing through in proper order and desulfurization section again. SOx/NOx control after the flue gas fully contacts with the absorption liquid, then follow the upper portion discharge, circulation liquid bath circulation pipeline outside the tower that the absorption liquid stream that sprays out enters the bottom carries respectively to denitration section and desulfurization section. Liquid in the circulation liquid bath of bottom carries out the oxidation to the hopcalite canister in according to the circulation fluid that requires regular discharge finite concentration of the required concentration of crystal system. Adopt the device to guarantee the active ingredient's in the circulation fluid of SOx/NOx control tower bottom concentration reliably for SOx/NOx control efficiency reaches the highlyest.
Description
Technical field
The utility model belongs to pollution that caused by coal burning thing removing field, is specifically related to a kind of ammonia process-tower external oxidation desulphurization denitration
Device.
Background technology
Nitrogen oxides is one of major pollutants of atmospheric environment, is mainly derived from burning and the motor vehicle emission of fossil fuel
Tail gas.Along with China's sustained and rapid development of economy, energy resource consumption increases, the NO in airxDischarge capacity increase the most rapidly
Add.Therefore carry out in the whole nation air NOxEnvironmental capacity extremely the most urgent.A large amount of discharges of sulfur dioxide make the sky in city
Gas pollutes and constantly increases the weight of and cause serious acid rain.If sulfur dioxide is not controlled by, by the city of sulfur dioxide pollution
Quantity will be further increased, and the regional extent of Acid Rain Pollution will expand further, and pollution level will increase the weight of further, to ecological ring
The harm in border grows in intensity, and causes bigger economic loss.
There are existing desulphurization denitration equipment in the most many power plant, but because its investment is big, operating cost is high, the most also want
Consume ample resources.Developing the desulphurization and denitration integrated technique mutually integrated with Wet Flue Gas Desulfurization Technique is a popular research side
To.Along with the extensive utilization of ammonia-process desulfurization technique, the advantage of the ammonia process of desulfurization highlights day by day.The ammonia process of desulfurization is while flue gas desulfurization
The value products such as byproduct of ammonium sulfate chemical fertilizer can be produced, and do not produce any secondary pollution, but its denitration ability
The highest.If able to develop a kind of high-efficiency desulfurization denitration and ammonia process of desulfurization denitration will be produced deep by the low method of ammonia consumption
Remote impact.
Summary of the invention
The utility model is for the deficiencies in the prior art, it is provided that a kind of arrange outside tower in the technique of original ammonia process of desulfurization
Oxidation tank and the method utilizing catalysis to aoxidize complete the device of simultaneous SO_2 and NO removal, and denitrification efficiency is higher.
To achieve these goals, the utility model offer techniques below scheme: a kind of ammonia process-tower external oxidation desulphurization denitration
Device, this device includes oxidation spray equipment, desulphurization denitration tower and the tower external oxidation tank being sequentially connected with, also include water supply system
System and ammonia tank, described desulphurization denitration tower include setting gradually from top to bottom except mist section, Water spray section, washing layer, desulfurization section,
Denitration section and tower bottoming cycle liquid pool, described be provided with exhaust outlet, described Water spray section and tower bottoming cycle liquid pool except the top of mist section
All it is connected with water supply system, between described tower bottoming cycle liquid pool and desulfurization section, is provided with circulation line and force (forcing) pump, Yi Jita
Being also equipped with circulation line and force (forcing) pump between bottoming cycle liquid pool and denitration section, described circulation line flows to as from bottom to up, institute
State the denitration section on desulphurization denitration tower and the position between tower bottoming cycle liquid pool to be connected with oxidation spray equipment, described oxidation spray
Being provided with gas approach on device, described tower bottoming cycle liquid pool is connected with tower external oxidation tank, reactant liquor upper strata in tower external oxidation tank
Being connected by return line between position with tower bottoming cycle liquid pool, ammonia tank connects with tower bottoming cycle liquid pool and tower external oxidation tank respectively
Connect.
Preferably the utility model device is additionally provided with supplementary air system, described supplementary air system and tower external oxidation tank
Connect.
Preferably supplement described in the utility model device and be provided with oxidation fan between air system and tower external oxidation tank.
Preferably the utility model device is additionally provided with cyclone and circulating pump, outside the outlet of described cyclone is with described tower
Oxidation tank connects, and the import of described cyclone is connected with described circulation delivery side of pump, outside the import of described circulating pump is with described tower
Oxidation tank connects.
Preferably the utility model device is provided with the drier being connected with described cyclone, and described drier is provided below
There is ammonium sulfate storage equipment.
Using method of the present utility model comprises the following steps:
When flue gas first flows through oxidation spray equipment after gas approach enters, make with oxygen reaction under oxidant effect
Obtain part NO and be converted into NO2, continuing up in flow process and spray liquid is fully contacted, desulphurization denitration, then from the top of tower
Discharging, the spray liquid in each section of spraying layer flows back to tower bottoming cycle liquid pool under gravity, logical in the bottom of tower bottoming cycle liquid pool
Entering ammonia to adjust the PH of circulation fluid, circulation fluid is re-delivered to desulfurization section and denitration section through circulation line, when in circulation fluid
The concentration of ammonium sulfite at 7%-13%, aoxidize in circulation fluid in tower reactor is expelled to tower external oxidation tank, supplied by water
System is to circulation liquid pool amount of makeup water.
The preferably application process of the utility model ammonia process-tower external oxidation desulfuring and denitrifying apparatus, by supplementary air system
In tower external oxidation tank, inject oxygen, in tower external oxidation tank, inject ammonia by ammonia tank.
The preferably application process of the utility model ammonia process-tower external oxidation desulfuring and denitrifying apparatus, the PH of described desulfurization section is
5.0-6.5, temperature is 35 DEG C-55 DEG C；The PH of described denitration section is 5.0-6.5, and temperature is 45 DEG C-180 DEG C；Described circulation liquid pool
In PH be 5.5-6.5, temperature is 35 DEG C-45 DEG C；PH in described tower external oxidation tank is 7.0-8.0, to ensure in solution
Hydrogen ion reacts away, and obtains the purest ammonium sulfate, so the consumption of ammonia to be ensured in running.
The preferably application process of the utility model ammonia process-tower external oxidation desulfuring and denitrifying apparatus, in described oxidation spray section
The oxidant used includes with citric acid as complexing agent, uses sol-gel process to prepare composite oxide catalysts, dioxygen
The strong oxidizer such as water, potassium permanganate.
The preferably application process of the utility model ammonia process-tower external oxidation desulfuring and denitrifying apparatus, in described tower external oxidation tank
Separated, the dried collection of ammonium sulfate fertilizer that reaction generates is stored.
The utility model application is mainly concerned with the reaction in desulphurization and denitration, sulfite oxidation and circulation liquid pool.Respectively
The principle that section is concrete is as follows:
(1) oxidation spray equipment reaction
2NO + O2=2NO2
At oxidation spray equipment 7, part NO is oxidized to NO2, because NO2It is easier to and ammonium sulfate reacts, thus improve whole
The efficiency of individual desulphurization denitration.
(2) desulfurization section 5 reacts
SO2 + NH3H2O = (NH4) 2SO3
SO2+ (NH4) 2SO3 + H2O = 2NH4HSO3
Carrying out sulfur dioxide absorption at the main ammonia of desulfurization section 5, ammonium sulfite also has certain suction to sulfur dioxide simultaneously
Receipts ability.
(3) reaction of denitration section 6
2(NH4)2SO3+2NO=2(NH4)2SO4 +N2↑
4(NH4)2SO3+2NO2=4(NH4)2SO4+ N2↑
2NH4HSO3+2NO=2NH4HSO4+N2↑
4NH4HSO3+2NO2=4NH4HSO4+N2↑
In ammonia process of desulfurization denitrating technique system, NOxReaction with ammonium sulfite is quickly.Utilize (the NH that desulfurization produces4)
2SO3To NOxThere is certain Reducing and absorption ability to remove NOxThereby may be ensured that higher removal efficiency.
(4) reaction in circulation liquid pool 19
NH3+H2O = NH3H2O
NH3H2O+ NH4HSO3 = (NH4)2SO3 +H2O
Along with SO in course of reaction2Gradually suck the acid enhancing made in solution, and then result in NH4HSO3's
Increase, but NH4HSO3To SO2There is no absorbability, so to be passed through NH in reaction solution3Regulate the pH of circulation fluid, with
Just solution has optimal absorption SO2Ability and minimum ammonia consumption.
(5) key reaction in tower external oxidation tank 11
NH4HSO3 +NH3=(NH4)2SO3
(NH4)2SO3+1/2O2= (NH4)2SO4
Tower external oxidation tank 11 is (NH due to the main component of liquid4)2SO3And NH4HSO3((NH4)2SO3Concentration
Reach 10%), in order to utilize nitrogen element more fully, use the way adding ammonia in tower external oxidation tank 11 to make NH4HSO3Also
Originally it was (NH4) 2SO3, it is oxidized to stable ammonium sulfate fertilizer the most again.
Compared with prior art, the utility model has the advantage that
(1) denitrification efficiency is high.
In desulphurization denitration tower 1, ammoniacal liquor is fully contacted with flue gas, belongs to gas-liquid reaction, instantaneous completes, and utilizes simultaneously and urges
Agent makes part NO be converted into NO2, NO2Faster reaction rate is had with inferior sulfate radical.Under same reaction conditions, it is reaction speed
The fastest whole system denitration efficiency of rate is able to maintain that between 70%-80%, and desulfuration efficiency can maintain more than 95%.
(2) multifunctional all is synchronized.
There is good desulfurization and dedusting function, simultaneously NOxProduce moment reaction generation nitrogen and water completes denitration function.
(3) SR is little
Owing to reaction tower belongs to spray tower, tower body resistance ratios packed tower resistance is little, only the 1/3 of packed tower resistance.Warp
Crossing drag evaluation and repeatedly actual application, test proves that tower body resistance is less than 1000Pa.
(4) desulfurization reaction temperature interval variable range is big
In 35 DEG C of-180 DEG C of reaction towers, desulfuration efficiency still can reach more than 95%.Liquid pH value controls generating
(NH4) 2SO3Within the scope of, and then reduce the corrosion of equipment.The temperature of circulation fluid is the highest, and the solubility of sulphur ammonium is the biggest, runs
Middle general control makes circulation fluid close to below the concentration of saturated crystallization so that it is crystallizes outside tower, is prevented effectively from clogging.
(5) exhaust gas volumn and the change of amount of sulfur contenting in smoke are adapted to
Desulphurization system has higher reliability and flexibility, and when exhaust gas volumn changes, control system is the most timely
Carry out desulfurizing agent concentration and consumption regulation.When desulfurizing agent concentration increases, system uses unique structure design effectively to prevent gas
The escape of state ammonia.And then avoid the waste of desulfurizing agent and the problem of environmental pollution being likely to result in.
(6) operating cost is low
Ammonia process-tower external oxidation desulphurization denitration technology is denitration to be combined with the ammonia process of desulfurization, utilizes desulfurization absorbing liquid as de-
Nitre absorbent, drastically reduce the area the operating costs such as current denitration engineering reducing agent and relevant device.
Accompanying drawing explanation
Fig. 1 is the device of the utility model ammonia process-tower external oxidation desulphurization denitration.
Detailed description of the invention
Being described in detail the utility model below in conjunction with the accompanying drawings, the description of this part is only exemplary and explanatory,
Protection domain of the present utility model should there be is not any restriction effect.
As it is shown in figure 1, the utility model device includes outside oxidation spray equipment 7, desulphurization denitration tower 1 and the tower being sequentially connected with
Oxidation tank 11, also includes that water supply system 16 and ammonia tank 17, described desulphurization denitration tower 1 include that set gradually from top to bottom removes
Mist section 2, Water spray section 3, washing layer 4, desulfurization section 5, denitration section 6 and tower bottoming cycle liquid pool 19, the described top except mist section 2 is arranged
Exhaust outlet, described Water spray section 3 and tower bottoming cycle liquid pool 19 is had all to be connected with water supply system 16, described tower bottoming cycle liquid pool 19
And it is provided with between desulfurization section 5 between circulation line 10 and force (forcing) pump, and tower bottoming cycle liquid pool 19 and denitration section 6 and is also equipped with
Circulation line and force (forcing) pump, described circulation line flows to as from bottom to up, at the bottom of denitration section 6 on described desulphurization denitration tower 1 and tower
Position between circulation liquid pool 19 is connected with oxidation spray equipment 7, and described oxidation spray equipment 7 is provided with gas approach 8, institute
State tower bottoming cycle liquid pool 19 to be connected with tower external oxidation tank 11, reactant liquor topside position and tower bottoming cycle liquid pool in tower external oxidation tank 11
Being connected by return line between 19, ammonia tank 17 is connected with tower bottoming cycle liquid pool 19 and tower external oxidation tank 11 respectively.
Flue gas from boiler tail is connected with gas approach 8, and after flowing through oxidation spray equipment 7, flue gas enters reaction tower
Flow up, through denitration section 6 and desulfurization section 5.Different with traditional arrangement, the utility model uses the stream along flue gas
To being followed successively by denitration section 6, desulfurization section 5, using this method for arranging purpose is to utilize ammonia and sulfur dioxide to react the sulfurous acid obtained
Ammonium and ammonium bisulfite come and reaction of nitrogen oxides, thus improve the absorptivity of nitrogen oxides, and reacted circulation fluid is at gravity
Effect under flow back to circulation fluid pond 19.Water supply system 16 is connected with circulation liquid pool 19 and is arranged in ammonia transfer pipeline same
Side, so can simplify installation.
Further the utility model device is additionally provided with supplementary air system 18, outside described supplementary air system 18 is with tower
Oxidation tank 11 connects.It is provided with oxidation fan 9 between described supplementary air system 18 and tower external oxidation tank 11.
Preferred embodiment device is additionally provided with cyclone 12 and circulating pump 13, the outlet of described cyclone 12 and described tower
External oxidation tank 11 connects, and the import of described cyclone 12 is connected with the outlet of described circulating pump 13, the import of described circulating pump 13
It is connected with described tower external oxidation tank 11.
Further the utility model device is additionally provided with the drier (14) being connected with described cyclone 12, described dry
Device 14 is provided below ammonium sulfate storage equipment 15.
When the utility model device uses, flue gas first flows through oxidation spray equipment 7 after gas approach 8 enters, at oxygen
Part NO is made to be converted into NO with oxygen reaction under agent effect2, continue up in flow process and spray liquid is fully contacted, de-
Sulphur denitration, then discharges from the top of tower, and the spray liquid in each section of spraying layer flows back to tower bottoming cycle liquid pool 19 under gravity,
Being passed through ammonia in the bottom of tower bottoming cycle liquid pool 19 to adjust the PH of circulation fluid, circulation fluid is re-delivered to through circulation line 10
Desulfurization section 5 and denitration section 6, when the concentration of the ammonium sulfite in circulation fluid is at 7%-13%, outside in tower reactor, circulation fluid is expelled to tower
Aoxidize in oxidation tank 11, by water supply system 16 to circulation liquid pool 19 amount of makeup water, by supplementary air system 18 to
Tower external oxidation tank 11 injects oxygen, in tower external oxidation tank 11, injects ammonia by ammonia tank 17.The pH of described desulfurization section 5 is
5.0-6.5, temperature is 35 DEG C-55 DEG C；The pH of described denitration section 6 is 5.0-6.5, and temperature is 45 DEG C-180 DEG C；Described circulation fluid
PH in pond 19 is 5.5-6.5, and temperature is 35 DEG C-45 DEG C；PH in described tower external oxidation tank 11 is 7.0-8.0, molten to ensure
Hydrogen ion in liquid reacts away, and obtains the purest ammonium sulfate, so the consumption of ammonia to be ensured in running.Described
Oxidant employed in oxidation spray section 7, preferably with citric acid as complexing agent, uses sol-gel process to prepare combined oxidation
Thing catalyst, the strong oxidizer such as hydrogen peroxide, potassium permanganate.Described tower external oxidation tank 11 reacts the ammonium sulfate fertilizer of generation through rotation
Stream device 12 separates, drier 14 collects storage by ammonium sulfate storage equipment 15 after drying.
Ammonia process of the present utility model-tower external oxidation desulfuring and denitrifying apparatus ammonia consumption is 0.38kg/kg NOx, and urge on a small quantity
Changing oxidant and power consumption, denitration cost is less than 5.5 yuan/kg NOx, relatively SCR reduces nearly 35%.
Application example:
Now as a example by the coal-powder boiler boiler of 200MW.
Master data:
3x200MW generating set, outfit 670t/h boiler, flue gas total flow 1400000m3/h,
Wherein amount of sulfur contenting in smoke SO2 3000mg/Nm3
Nitrogen oxides 450 mg/Nm3
Sulfur content SO2 120mg/Nm3 in neat stress
Nitrogen oxides 95mg/Nm3
Knowable to wherein, desulfuration efficiency is more than 96%, and denitration efficiency is more than 78.89%.
Main technologic parameters:
Denitration spraying layer spray flux 15400 m3/h pH 5.8
Desulfurization spraying layer spray flux 124600 m3/h pH 6.5
Pressure drop 1000pa
Tower gas velocity 3.5m/s
Liquid-gas ratio 10L/m3
The above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of without departing from the utility model principle, it is also possible to make some improvements and modifications, these improve and
Retouching also should be regarded as protection domain of the present utility model.
Claims (5)
1. the device of ammonia process-tower external oxidation desulphurization denitration, it is characterised in that this device includes the oxidation spray being sequentially connected with
Device (7), desulphurization denitration tower (1) and tower external oxidation tank (11), also include water supply system (16) and ammonia tank (17), described de-
Sulphur denitrating tower (1) include setting gradually from top to bottom except mist section (2), Water spray section (3), washing layer (4), desulfurization section (5), de-
Nitre section (6) and tower bottoming cycle liquid pool (19), described be provided with exhaust outlet, described Water spray section (3) and tower except the top of mist section (2)
Bottoming cycle liquid pool (19) is all connected with water supply system (16), arranges between described tower bottoming cycle liquid pool (19) and desulfurization section (5)
Have between circulation line (10) and force (forcing) pump, and tower bottoming cycle liquid pool (19) and denitration section (6) be also equipped with circulation line and
Force (forcing) pump, described circulation line flows to as from bottom to up, the denitration section (6) on described desulphurization denitration tower (1) and tower bottoming cycle liquid
Position between pond (19) is connected with oxidation spray equipment (7), and described oxidation spray equipment (7) is provided with gas approach (8),
Described tower bottoming cycle liquid pool (19) is connected with tower external oxidation tank (11), in tower external oxidation tank (11) at the bottom of reactant liquor topside position and tower
Connected by return line between circulation liquid pool (19), ammonia tank (17) respectively with tower bottoming cycle liquid pool (19) and tower external oxidation tank
(11) connect.
The device of ammonia process the most according to claim 1-tower external oxidation desulphurization denitration, it is characterised in that be additionally provided with supplementary
Air system (18), described supplementary air system (18) is connected with tower external oxidation tank (11).
The device of ammonia process the most according to claim 2-tower external oxidation desulphurization denitration, it is characterised in that described supplementary air
Oxidation fan (9) it is provided with between system (18) and tower external oxidation tank (11).
The device of ammonia process the most according to claim 3-tower external oxidation desulphurization denitration, it is characterised in that be additionally provided with eddy flow
Device (12) and circulating pump (13), the outlet of described cyclone (12) is connected with described tower external oxidation tank (11), described cyclone
(12) import is connected with the outlet of described circulating pump (13), the import of described circulating pump (13) and described tower external oxidation tank (11)
Connect.
The device of ammonia process the most according to claim 4-tower external oxidation desulphurization denitration, it is characterised in that be provided with described
The drier (14) that cyclone (12) connects, described drier (14) is provided below ammonium sulfate storage equipment (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620214329.2U CN205550037U (en) | 2016-03-17 | 2016-03-17 | Device of outer oxidative desulfurization denitration of ammonia process - tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620214329.2U CN205550037U (en) | 2016-03-17 | 2016-03-17 | Device of outer oxidative desulfurization denitration of ammonia process - tower |
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| Publication Number | Publication Date |
|---|---|
| CN205550037U true CN205550037U (en) | 2016-09-07 |
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ID=56814309
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620214329.2U Expired - Fee Related CN205550037U (en) | 2016-03-17 | 2016-03-17 | Device of outer oxidative desulfurization denitration of ammonia process - tower |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105597534A (en) * | 2016-03-17 | 2016-05-25 | 盐城东博环保科技有限公司 | Device and method for ammonia process-outer-tower oxidation desulfurization and denitrification |
-
2016
- 2016-03-17 CN CN201620214329.2U patent/CN205550037U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105597534A (en) * | 2016-03-17 | 2016-05-25 | 盐城东博环保科技有限公司 | Device and method for ammonia process-outer-tower oxidation desulfurization and denitrification |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160907 Termination date: 20180317 |
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| CF01 | Termination of patent right due to non-payment of annual fee |