CN109701383A - A kind of new catalytic method desulfuring and denitrifying apparatus and technique for coke oven flue gas - Google Patents
A kind of new catalytic method desulfuring and denitrifying apparatus and technique for coke oven flue gas Download PDFInfo
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- CN109701383A CN109701383A CN201711015859.XA CN201711015859A CN109701383A CN 109701383 A CN109701383 A CN 109701383A CN 201711015859 A CN201711015859 A CN 201711015859A CN 109701383 A CN109701383 A CN 109701383A
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Abstract
A kind of new catalytic method desulfuring and denitrifying apparatus and technique for coke oven flue gas, is related to cock-oven gas purifying field, and desulfurization utilizes moisture, the oxygen, SO in flue gas2And heat, produce certain density sulfuric acid；Denitration utilizes NH3SCR denitration principle is aided with except ammonia catalyst, denitration is except ammonia integration using nano multiple-metal catalyst as denitrating catalyst.This technique core is catalyst, and desulfurization is that desulfurizing agent is prepared in carrier loaded certain active component with Carbon Materials using one kind, to SO2Producing acid by oxidation process has catalytic；Using nano multiple-metal catalyst as denitrating catalyst, 80 ~ 140 DEG C of reaction temperature section is real low temperature catalyst for denitration.Whole set process process is simple, and low energy consumption.
Description
Technical field
The present invention relates to cock-oven gas purifying technical fields, and in particular to a kind of new catalytic method for coke oven flue gas is de-
Sulphur denitrification apparatus and technique suitable for coke oven flue gas desulphurization denitration, remove in flue gas that is, by desulphurizing system of catalytic and technique
SO2And NOx.
Background technique
Coke oven is one of the equipment that atmosphere pollution most serious is caused in metallurgy industry.The pollutant component of coke oven discharge is multiple
It is miscellaneous, contain nitrogen oxides (NOx), sulfur dioxide, carbon monoxide, carbon dioxide, hydrogen sulfide, hydrogen cyanide, residual ammonia, phenol and coal
The pollutant of dirt, tar etc., these discharges has aggravated the pollution level of haze.
In recent years, haze phenomenon frequently occurs on China's most area, and country is more next to environment protection treating (atmosphere pollution)
More pay attention to, discharge standard is increasingly stringenter, and the discharge standard of some areas coke oven has required are as follows: SO2Less than 30mg/Nm3；NOx is small
In 150mg/Nm3；Dust is less than 15mg/Nm3.And the SO of current coke oven2, NOx content cannot reach emissions requirements, therefore increase
Adding coke oven flue gas desulfuring and denitrifying apparatus is the problem of coking unit must be taken into consideration.
Existing desulfurization and denitrification integral is mainly used for power plant, prevailing technology route are as follows: SCR+ wet desulphurization.But coke oven cigarette
Gas property differs farther out with power-plant flue gas property, and SCR+ wet desulfurizing process is not particularly suited for coke oven flue gas.And this set technique sheet
Body is there is also some problems, and wherein wet desulphurization has the following problems:
A) process is complicated, more demanding to operating；
B) investment desulfurizing agent need to be continued, product gypsum economic value is low, and operating cost is higher；
C) rate of water make-up is big, and wastewater discharge is big；
D) electrical equipment is more, and energy consumption is high；
SCR denitration has the following problems:
A) at present most widely used denitrating catalyst be alum base catalyst, the most suitably used temperature range of this catalyst be 300 ~
400 DEG C, before being typically located at air preheater, dust and SO2Concentration is high, and dust can cause to wash away to catalyst, destroys catalyst, and
Catalyst is to SO2It is converted to SO3There are catalytic action, SO3Easily with the NH of escape3Reaction generates NH4HSO4, NH4HSO4150 ~ 230
DEG C be liquid, have viscosity, easily blocking air preheater；
After b) if SCR is arranged in desulfurization, dust and SO2Concentration is lower, but flue-gas temperature is low, and alum base catalyst temperature is not achieved
It is required that needing to heat up, with heating furnace is put on, energy consumption is high；Even low form alum base catalyst, it is also desirable to reach 260 DEG C or more
Temperature.
Summary of the invention
To solve the above problems, the present invention provides a kind of new catalytic method desulfuring and denitrifying apparatus for coke oven flue gas and
Technique, desulfurization are that catalyst is prepared in carrier loaded certain active component using a kind of Carbon Materials, adsorb the H in flue gas2O、
SO2And O2, generate H2SO4, make SO in flue gas2Meet national emission standard requirement；Denitration utilizes NH3SCR denitration principle uses
Nano multiple-metal catalyst is aided with except ammonia catalyst, denitration is except ammonia integration as denitrating catalyst.It is removed using except ammonia catalyst
Further denitration, makes NOx, NH while ammonia3It is all satisfied national emission standard requirement.
A kind of new catalytic method desulfurization for coke oven flue gas in order to overcome the deficiencies in the prior art, the present invention provides
The solution of denitrification apparatus and technique, specific as follows:
A kind of new catalytic method desulfuring and denitrifying apparatus for coke oven flue gas, the catalytic desulfurizing device are provided in coke oven flue gas
Discharge outlet rear, the catalytic desulfurizing device includes that the waste heat being connected with the discharge outlet of coke oven flue gas by pipeline returns
Receiving apparatus；
The waste-heat recovery device also passes through pipeline and is connected with flue gas quality regulating system, and the flue gas quality regulating system also passes through setting
There is the pipeline of air blower to be connected with the smoke inlet 11 of desulfurizing tower；
The sulfuric acid outlet 16 of the desulfurizing tower is connected by pipeline with regenerated reactor, and the regenerated reactor is also by being provided with regeneration pump
Pipeline be connected with the spray inlet 15 of the desulfurizing tower；
The exhanst gas outlet 12 of the desulfurizing tower is connected each by pipeline with chimney with the air outlet 13 of the desulfurizing tower, described
Chimney is also connected to by being provided with the pipeline of back blowing machine with the air inlet 14 of the desulfurizing tower；
Oxidizing tower is connected with the exhaust outlet 19 of the desulfurizing tower by pipeline；
The oxidizing tower also passes through pipeline and is connected with ammonia-spraying grid AIG, the ammonia-spraying grid AIG by pipeline respectively with mix
Device, the first smoke inlet 1 of denitrating tower are connected with the second smoke inlet 2 of denitrating tower；
The mixer also passes through pipeline and is connected respectively with evaporator and heater；
The evaporator is also connected with the pipeline for being provided with pump, and the heater is also connected with the pipeline for being provided with blower.
The waste-heat recovery device, which is used to that coke oven flue gas is allowed to pass through the waste-heat recovery device, to be recycled more than coke oven flue gas
Heat, and reduce flue-gas temperature；
The flue gas quality regulating system is used to adjust the temperature of coke oven flue gas and the humidity of coke oven flue gas, so that the temperature of coke oven flue gas
Reach the desulphurization catalyst requirement in desulfurizing tower with the humidity of coke oven flue gas；
The desulfurizing tower is used to allow the coke oven flue gas into the desulfurizing tower by hydrodesulfurisation catalyst layer, so that in coke oven flue gas
H2O、SO2And O2It is adsorbed, thus obtained clean flue gas is discharged；
The H that hydrodesulfurisation catalyst layer 7 in the desulfurizing tower is used to be adsorbed on desulphurization catalyst2O、SO2And O2, in desulfurization catalyst
Under the action of agent, SO2And O2Reaction generates SO3, SO3With H2O, which is combined, generates H2SO4；
The desulphurization catalyst reaches saturation after a period of work, by washing, the H that will be stored on desulphurization catalyst2SO4Band
Out, the sulfuric acid after dilution is formed, while by washing so that desulphurization catalyst regenerates；Clean flue gas is introduced by back blowing machine
Into desulfurizing tower, drying processing is carried out to desulphurization catalyst；
The oxidizing tower is used to allow urges from the flue gas that the exhaust outlet of Dry denitration device is discharged by the oxidation in the oxidizing tower
Agent oxidation, is oxidized to NO for the part NO in flue gas2, make NO/NO2Than reaching certain value；
The evaporator is used to that liquefied ammonia or ammonium hydroxide is allowed to flash to gaseous state by evaporator, then mixes with air resulting mixture, wherein
Ammonia be diluted to 5% hereinafter, ammonia after the dilution by after ammonia-spraying grid AIG with flue gas in the pipeline for leading to denitrating tower
In be uniformly mixed into smoke mixture；
The denitrating tower is used to allow the smoke mixture into the denitrating tower by denitration catalyst oxidant layer 5, so that flue gas mixes
NH in object3、O2And NOx, under the action of denitrating catalyst, reaction generates N2And H20；
Denitrating catalyst in the denitrating tower can also be used to adsorb the complete NH of unreacted3。
The oxide layer with oxidant is provided in the oxidizing tower.
The denitrating tower includes the second tower body, and the denitrating catalyst with denitrating catalyst is arranged in second tower body
Layer 5, there are two denitration catalyst oxidant layer altogether for the denitration catalyst oxidant layer 5, and described two denitration catalyst oxidant layer are by top-down suitable
Sequence is arranged successively as upper catalyst oxidant layer and lower catalytic oxidant layer；
It is connected with inside second tower body in one side wall of second tower body by being sequentially disposed with from top to bottom
First smoke inlet 1 and the second smoke inlet 2, first smoke inlet 1 and the second smoke inlet 2 are located at the denitration
The lower section of the top of catalyst layer 5 and the denitration catalyst oxidant layer 5；
Another side wall of second tower body is connected with inside second tower body by being sequentially disposed with from top to bottom
First exhanst gas outlet 3 and the second exhanst gas outlet 4, first exhanst gas outlet 3 and the second exhanst gas outlet 4 are located at the denitration
The lower section of the top of catalyst layer 5 and the denitration catalyst oxidant layer 5；
First exhanst gas outlet 3 and the second exhanst gas outlet 4 are connected with the chimney.
The desulfurizing tower includes the first tower body, and the desulphurization catalyst with desulphurization catalyst is arranged in first tower body
Layer 17, first tower body bottom are provided with the sulfuric acid outlet 16 being connected with inside first tower body；
The smoke inlet 11 being connected with inside first tower body is provided in one side wall of first tower body；
The air inlet 14 being connected with inside first tower body is provided in another side wall of first tower body；
Be provided on the roof of first tower body exhanst gas outlet 12 being connected with inside first tower body, exhaust outlet 19,
Air outlet 13 and spray inlet 15.
The hydrodesulfurisation catalyst layer 7 is supported in first tower body in the anti-corrosion column 18 in first tower body.
The technique of the new catalytic method desulfuring and denitrifying apparatus for coke oven flue gas, specific as follows:
Step 1: coke oven flue gas passes through the waste-heat recovery device, recycles waste heat of coke-oven flue gas with this, drops in coke oven flue gas
After low temperature, coke oven flue gas continues through flue gas quality regulating system, adjusts the temperature of coke oven flue gas and the humidity of coke oven flue gas with this,
Then the coke oven flue gas enters desulfurizing tower under the action of air blower；
Step 2: after the coke oven flue gas is from the smoke inlet 1 of desulfurizing tower into the first tower body, via in hydrodesulfurisation catalyst layer 7
Desulphurization catalyst adsorbs the H in coke oven flue gas2O、SO2And O2, then clean flue gas is flowed out from exhanst gas outlet 2 up to chimney is arranged
It puts；
Step 3: and it is adsorbed on the H on the desulphurization catalyst surface in hydrodesulfurisation catalyst layer 72O、SO2And O2, generated through catalysis reaction
H2SO4, aqueous solution is extracted from regenerated reactor by regeneration pump in this way, is transmitted on the roof of the first tower body of the desulfurizing tower
Spray inlet 5 enters, and desulphurization catalyst is rinsed with this, by the H on desulphurization catalyst2SO4Regeneration is transmitted to from sulfuric acid outlet 6
Pond is used to relieving haperacidity with this or prepares sulfate until sulfuric acid concentration reaches setting value in regenerated reactor；
Step 4: after rinsing desulphurization catalyst, desulphurization catalyst has just restored activity, extracts in this way using back blowing machine clean
Flue gas enters from air inlet 4, and the moisture on desulphurization catalyst surface is sent to chimney from air outlet 3；
Step 5: liquefied ammonia or ammonium hydroxide flash to gaseous state, then carry out air in a mixer with blower conveying by being pumped into evaporator
Mixing, ammonia therein are diluted to 5% or less；
Step 6: the flue gas being discharged from exhaust outlet enters oxidizing tower, by layer of oxidation catalyst, part NO and O2In oxidation catalysis
Under the catalytic action of the oxidation catalyst of oxidant layer, reaction generates NO2；
Step 7: the ammonia after dilution is by being uniformly mixed into cigarette in the pipeline for leading to denitrating tower with flue gas after ammonia-spraying grid AIG
Gas mixture, then the smoke mixture enters denitrating tower, and the smoke mixture first enters second from the second smoke inlet 2
Tower body, by lower catalytic oxidant layer, NOx and NH3Under the action of catalyst, reaction generates N2And H20, the flue gas after following reaction
Mixture is up walked, the NH to escape in smoke mixture3Adsorbed by upper catalyst oxidant layer, flue gas from the first exhanst gas outlet 3 up to
Chimney discharge；NH is adsorbed to overlying catalyst3After saturation, switch gas inlet to allow smoke mixture from the first smoke inlet 1
Into the second tower body, by upper catalyst oxidant layer, NOx and the lower NH with denitrating catalyst adsorption of denitrating catalyst effect3
Reaction generates N2And H20, the smoke mixture after reaction is walked downward, the NH to escape in smoke mixture3By lower catalytic oxidant layer
Absorption, flue gas is from the second exhanst gas outlet 4 up to chimney is discharged.
The invention has the benefit that
The present invention puts into the desulphurization catalyst of desulfurization, no longer needs to plus other any desulfurizing agents, operating cost are low；The desulfurization is urged
Agent is renewable, and regeneration process is simple, and without heating, by washing, and regenerative process generates the sulfuric acid after dilution, has
Economic value does not generate other waste water；Coke oven flue gas temperature after desulfuring and denitrifying apparatus is held essentially constant, and can directly be arranged
It puts；The requirement of denitrating catalyst reaction temperature is low, and 80 ~ 140 DEG C of reaction temperature section is real low temperature catalyst；It will be in flue gas
NOx be catalysed and reduced into the N of no pollution to the environment2And H20；Denitrating catalyst chemical lifetime is long, up to 24000h；Denitration catalyst
Agent denitration efficiency is high, up to 85% or more.Its process flow is simple, and equipment is few, and occupied area is smaller, and construction cost is lower；Electricity consumption
Equipment is few, and low energy consumption.
Detailed description of the invention
Fig. 1 is the general structure schematic diagram for the new catalytic method desulfuring and denitrifying apparatus of coke oven flue gas.
Fig. 2 is the structural schematic diagram of desulfurizing tower.
Fig. 3 is the structural schematic diagram of denitrating tower.
In Fig. 2,11 be smoke inlet, and 12 be exhanst gas outlet, and 13 be air outlet, and 14 be air inlet, and 15 be spray inlet, 16
It is hydrodesulfurisation catalyst layer for sulfuric acid outlet, 17,18 be anti-corrosion column, and 19 be exhaust outlet；In Fig. 3,1 is the first smoke inlet, and 2 are
Second smoke inlet, 3 be the first exhanst gas outlet, and 4 be the second exhanst gas outlet, and 5 be denitration catalyst oxidant layer.
Specific embodiment
The present invention is described further below in conjunction with drawings and examples.
As shown in Figure 1-Figure 3, for the new catalytic method desulfuring and denitrifying apparatus of coke oven flue gas, the catalytic desulfurizing device
It is provided in the rear of the discharge outlet of coke oven flue gas, the catalytic desulfurizing device includes passing through pipeline with the discharge outlet of coke oven flue gas
The waste-heat recovery device being connected；
The waste-heat recovery device also passes through pipeline and is connected with flue gas quality regulating system, and the flue gas quality regulating system also passes through setting
There is the pipeline of air blower to be connected with the smoke inlet 11 of desulfurizing tower；
The sulfuric acid outlet 16 of the desulfurizing tower is connected by pipeline with regenerated reactor, and the regenerated reactor is also by being provided with regeneration pump
Pipeline be connected with the spray inlet 15 of the desulfurizing tower；
The exhanst gas outlet 12 of the desulfurizing tower is connected each by pipeline with chimney with the air outlet 13 of the desulfurizing tower, described
Chimney is also connected to by being provided with the pipeline of back blowing machine with the air inlet 14 of the desulfurizing tower；
Oxidizing tower is connected with the exhaust outlet 19 of the desulfurizing tower by pipeline；
The oxidizing tower also passes through pipeline and is connected with ammonia-spraying grid AIG, the ammonia-spraying grid AIG by pipeline respectively with mix
Device, the first smoke inlet 1 of denitrating tower are connected with the second smoke inlet 2 of denitrating tower；
The mixer also passes through pipeline and is connected respectively with evaporator and heater；
The evaporator is also connected with the pipeline for being provided with pump, and the heater is also connected with the pipeline for being provided with blower.
The waste-heat recovery device, which is used to that coke oven flue gas is allowed to pass through the waste-heat recovery device, to be recycled more than coke oven flue gas
Heat, and reduce flue-gas temperature；
The flue gas quality regulating system is used to adjust the temperature of coke oven flue gas and the humidity of coke oven flue gas, so that the temperature of coke oven flue gas
Reach the desulphurization catalyst requirement in desulfurizing tower with the humidity of coke oven flue gas；
The desulfurizing tower is used to allow the coke oven flue gas into the desulfurizing tower by hydrodesulfurisation catalyst layer, so that in coke oven flue gas
H2O、SO2And O2It is adsorbed, thus obtained clean flue gas is discharged；
The H that hydrodesulfurisation catalyst layer 7 in the desulfurizing tower is used to be adsorbed on desulphurization catalyst2O、SO2And O2, in desulfurization catalyst
Under the action of agent, SO2And O2Reaction generates SO3, SO3With H2O, which is combined, generates H2SO4；
The desulphurization catalyst reaches saturation after a period of work, by washing, the H that will be stored on desulphurization catalyst2SO4Band
Out, the sulfuric acid after dilution is formed, while by washing so that desulphurization catalyst regenerates；
Clean flue gas is introduced into desulfurizing tower by back blowing machine, drying processing is carried out to desulphurization catalyst；
The oxidizing tower is used to allow urges from the flue gas that the exhaust outlet of Dry denitration device is discharged by the oxidation in the oxidizing tower
Agent oxidation, is oxidized to NO for the part NO in flue gas2, make NO/NO2Than reaching certain value；
The evaporator is used to that liquefied ammonia or ammonium hydroxide is allowed to flash to gaseous state by evaporator, then mixes with air resulting mixture, wherein
Ammonia be diluted to 5% hereinafter, ammonia after the dilution by after ammonia-spraying grid AIG with flue gas in the pipeline for leading to denitrating tower
In be uniformly mixed into smoke mixture；
The denitrating tower is used to allow the smoke mixture into the denitrating tower by denitration catalyst oxidant layer 5, so that flue gas mixes
NH in object3、O2And NOx, under the action of denitrating catalyst, reaction generates N2And H20；
Denitrating catalyst in the denitrating tower can also be used to adsorb the complete NH of unreacted3。
The oxide layer with oxidant is provided in the oxidizing tower.
The denitrating tower includes the second tower body, and the denitrating catalyst with denitrating catalyst is arranged in second tower body
Layer 5, there are two denitration catalyst oxidant layer altogether for the denitration catalyst oxidant layer 5, and described two denitration catalyst oxidant layer are by top-down suitable
Sequence is arranged successively as upper catalyst oxidant layer and lower catalytic oxidant layer；
It is connected with inside second tower body in one side wall of second tower body by being sequentially disposed with from top to bottom
First smoke inlet 1 and the second smoke inlet 2, first smoke inlet 1 and the second smoke inlet 2 are located at the denitration
The lower section of the top of catalyst layer 5 and the denitration catalyst oxidant layer 5；
Another side wall of second tower body is connected with inside second tower body by being sequentially disposed with from top to bottom
First exhanst gas outlet 3 and the second exhanst gas outlet 4, first exhanst gas outlet 3 and the second exhanst gas outlet 4 are located at the denitration
The lower section of the top of catalyst layer 5 and the denitration catalyst oxidant layer 5；
First exhanst gas outlet 3 and the second exhanst gas outlet 4 are connected with the chimney.
The desulfurizing tower includes the first tower body, and the desulphurization catalyst with desulphurization catalyst is arranged in first tower body
Layer 17, first tower body bottom are provided with the sulfuric acid outlet 16 being connected with inside first tower body；
The smoke inlet 11 being connected with inside first tower body is provided in one side wall of first tower body；
The air inlet 14 being connected with inside first tower body is provided in another side wall of first tower body；
Be provided on the roof of first tower body exhanst gas outlet 12 being connected with inside first tower body, exhaust outlet 19,
Air outlet 13 and spray inlet 15.
The hydrodesulfurisation catalyst layer 7 is supported in first tower body in the anti-corrosion column 18 in first tower body.
The technique of the new catalytic method desulfuring and denitrifying apparatus for coke oven flue gas, specific as follows:
Step 1: coke oven flue gas passes through the waste-heat recovery device, recycles waste heat of coke-oven flue gas with this, drops in coke oven flue gas
After low temperature, coke oven flue gas continues through flue gas quality regulating system, adjusts the temperature of coke oven flue gas and the humidity of coke oven flue gas with this,
Then the coke oven flue gas enters desulfurizing tower under the action of air blower；
Step 2: after the coke oven flue gas is from the smoke inlet 1 of desulfurizing tower into the first tower body, via in hydrodesulfurisation catalyst layer 7
Desulphurization catalyst adsorbs the H in coke oven flue gas2O、SO2And O2, then clean flue gas is flowed out from exhanst gas outlet 2 up to chimney is arranged
It puts；
Step 3: and it is adsorbed on the H on the desulphurization catalyst surface in hydrodesulfurisation catalyst layer 72O、SO2And O2, generated through catalysis reaction
H2SO4, aqueous solution is extracted from regenerated reactor by regeneration pump in this way, is transmitted on the roof of the first tower body of the desulfurizing tower
Spray inlet 5 enters, and desulphurization catalyst is rinsed with this, by the H on desulphurization catalyst2SO4Regeneration is transmitted to from sulfuric acid outlet 6
Pond is used to relieving haperacidity with this or prepares sulfate until sulfuric acid concentration reaches setting value in regenerated reactor；
Step 4: after rinsing desulphurization catalyst, desulphurization catalyst has just restored activity, extracts in this way using back blowing machine clean
Flue gas enters from air inlet 4, and the moisture on desulphurization catalyst surface is sent to chimney from air outlet 3；
Step 5: liquefied ammonia or ammonium hydroxide flash to gaseous state, then carry out air in a mixer with blower conveying by being pumped into evaporator
Mixing, ammonia therein are diluted to 5% or less；
Step 6: the flue gas being discharged from exhaust outlet enters oxidizing tower, by layer of oxidation catalyst, part NO and O2In oxidation catalysis
Under the catalytic action of the oxidation catalyst of oxidant layer, reaction generates NO2；
Step 7: the ammonia after dilution is by being uniformly mixed into cigarette in the pipeline for leading to denitrating tower with flue gas after ammonia-spraying grid AIG
Gas mixture, then the smoke mixture enters denitrating tower, and the smoke mixture first enters second from the second smoke inlet 2
Tower body, by lower catalytic oxidant layer, NOx and NH3Under the action of catalyst, reaction generates N2And H20, the flue gas after following reaction
Mixture is up walked, the NH to escape in smoke mixture3Adsorbed by upper catalyst oxidant layer, flue gas from the first exhanst gas outlet 3 up to
Chimney discharge；NH is adsorbed to overlying catalyst3After saturation, switch gas inlet to allow smoke mixture from the first smoke inlet 1
Into the second tower body, by upper catalyst oxidant layer, NOx and the lower NH with denitrating catalyst adsorption of denitrating catalyst effect3
Reaction generates N2And H20, the smoke mixture after reaction is walked downward, the NH to escape in smoke mixture3By lower catalytic oxidant layer
Absorption, flue gas is from the second exhanst gas outlet 4 up to chimney is discharged.
The invention has the benefit that
The present invention puts into the desulphurization catalyst of desulfurization, no longer needs to plus other any desulfurizing agents, operating cost are low；The desulfurization is urged
Agent is renewable, and regeneration process is simple, and without heating, by washing, and regenerative process generates the sulfuric acid after dilution, has
Economic value does not generate other waste water；Coke oven flue gas temperature after desulfuring and denitrifying apparatus is held essentially constant, and can directly be arranged
It puts；The requirement of denitrating catalyst reaction temperature is low, and 80 ~ 140 DEG C of reaction temperature section is real low temperature catalyst；It will be in flue gas
NOx be catalysed and reduced into the N of no pollution to the environment2And H20；Denitrating catalyst chemical lifetime is long, up to 24000h；Denitration catalyst
Agent denitration efficiency is high, up to 85% or more.Its process flow is simple, and equipment is few, and occupied area is smaller, and construction cost is lower；Electricity consumption
Equipment is few, and low energy consumption.
The present invention is described in a manner of Detailed description of the invention above, it will be understood by those of skill in the art that the disclosure
It is not limited to embodiments described above, in the case of without departing from the scope of the present invention, can make a variety of changes, change and replace
It changes.
Claims (6)
1. a kind of new catalytic method desulfuring and denitrifying apparatus for coke oven flue gas, which is characterized in that for the novel of coke oven flue gas
Catalytic desulfurizing denitrification apparatus, the catalytic desulfurizing device are provided in the rear of the discharge outlet of coke oven flue gas, the catalysis method
Desulfurizer includes the waste-heat recovery device being connected with the discharge outlet of coke oven flue gas by pipeline；
The waste-heat recovery device also passes through pipeline and is connected with flue gas quality regulating system, and the flue gas quality regulating system also passes through setting
There is the pipeline of air blower to be connected with the smoke inlet of desulfurizing tower；
The sulfuric acid outlet of the desulfurizing tower is connected by pipeline with regenerated reactor, and the regenerated reactor is also by being provided with regeneration pump
Pipeline is connected with the spray inlet of the desulfurizing tower；
The exhanst gas outlet of the desulfurizing tower is connected each by pipeline with chimney with the air outlet of the desulfurizing tower, the chimney
Also it is connected to by being provided with the pipeline of back blowing machine with the air inlet of the desulfurizing tower；
Oxidizing tower is connected with the exhaust outlet of the desulfurizing tower by pipeline；
The oxidizing tower also passes through pipeline and is connected with ammonia-spraying grid AIG, the ammonia-spraying grid AIG by pipeline respectively with mix
Device, the first smoke inlet of denitrating tower are connected with the second smoke inlet of denitrating tower；
The mixer also passes through pipeline and is connected respectively with evaporator and heater；
The evaporator is also connected with the pipeline for being provided with pump, and the heater is also connected with the pipeline for being provided with blower.
2. the new catalytic method desulfuring and denitrifying apparatus according to claim 1 for coke oven flue gas, which is characterized in that described
Waste-heat recovery device is used to that coke oven flue gas is allowed to recycle waste heat of coke-oven flue gas by the waste-heat recovery device, and reduces flue gas
Temperature；
The flue gas quality regulating system is used to adjust the temperature of coke oven flue gas and the humidity of coke oven flue gas, so that the temperature of coke oven flue gas
Reach the desulphurization catalyst requirement in desulfurizing tower with the humidity of coke oven flue gas；
The desulfurizing tower is used to allow the coke oven flue gas into the desulfurizing tower by hydrodesulfurisation catalyst layer, so that in coke oven flue gas
H2O、SO2And O2It is adsorbed, thus obtained clean flue gas is discharged；
The H that hydrodesulfurisation catalyst layer 7 in the desulfurizing tower is used to be adsorbed on desulphurization catalyst2O、SO2And O2, in desulfurization catalyst
Under the action of agent, SO2And O2Reaction generates SO3, SO3With H2O, which is combined, generates H2SO4；
The desulphurization catalyst reaches saturation after a period of work, by washing, the H that will be stored on desulphurization catalyst2SO4Band
Out, the sulfuric acid after dilution is formed, while by washing so that desulphurization catalyst regenerates；
Clean flue gas is introduced into desulfurizing tower by back blowing machine, drying processing is carried out to desulphurization catalyst；
The oxidizing tower is used to allow urges from the flue gas that the exhaust outlet of Dry denitration device is discharged by the oxidation in the oxidizing tower
Agent oxidation, is oxidized to NO for the part NO in flue gas2, make NO/NO2Than reaching certain value；
The evaporator is used to that liquefied ammonia or ammonium hydroxide is allowed to flash to gaseous state by evaporator, then mixes with air resulting mixture, wherein
Ammonia be diluted to 5% hereinafter, ammonia after the dilution by after ammonia-spraying grid AIG with flue gas in the pipeline for leading to denitrating tower
In be uniformly mixed into smoke mixture；
The denitrating tower is used to allow the smoke mixture into the denitrating tower by denitration catalyst oxidant layer, so that smoke mixture
In NH3、O2And NOx, under the action of denitrating catalyst, reaction generates N2And H20；
Denitrating catalyst in the denitrating tower can also be used to adsorb the complete NH of unreacted3。
3. the new catalytic method desulfuring and denitrifying apparatus according to claim 1 for coke oven flue gas, which is characterized in that described
The oxide layer with oxidant is provided in oxidizing tower；
The denitrating tower includes the second tower body, and the denitration catalyst oxidant layer with denitrating catalyst is arranged in second tower body,
The denitration catalyst oxidant layer shares two denitration catalyst oxidant layer, and described two denitration catalyst oxidant layer press top-down sequence successively
It is arranged as upper catalyst oxidant layer and lower catalytic oxidant layer；
It is connected with inside second tower body in one side wall of second tower body by being sequentially disposed with from top to bottom
First smoke inlet and the second smoke inlet, first smoke inlet and the second smoke inlet are located at the denitration catalyst
The lower section of the top of oxidant layer and the denitration catalyst oxidant layer；
Another side wall of second tower body is connected with inside second tower body by being sequentially disposed with from top to bottom
First exhanst gas outlet and the second exhanst gas outlet, first exhanst gas outlet and the second exhanst gas outlet are located at the denitration catalyst
The lower section of the top of oxidant layer and the denitration catalyst oxidant layer；
First exhanst gas outlet and the second exhanst gas outlet are connected with the chimney.
4. the new catalytic method desulfuring and denitrifying apparatus according to claim 1 for coke oven flue gas, which is characterized in that described
Desulfurizing tower includes the first tower body, is arranged the hydrodesulfurisation catalyst layer with desulphurization catalyst in first tower body, and described first
Tower body bottom is provided with the sulfuric acid outlet being connected with inside first tower body；
The smoke inlet being connected with inside first tower body is provided in one side wall of first tower body；
The air inlet being connected with inside first tower body is provided in another side wall of first tower body；
Exhanst gas outlet, the exhaust outlet, outlet air being connected with inside first tower body are provided on the roof of first tower body
Mouth and spray inlet.
5. the new catalytic method desulfuring and denitrifying apparatus according to claim 4 for coke oven flue gas, which is characterized in that in institute
The hydrodesulfurisation catalyst layer 7 is supported in first tower body by the anti-corrosion column stated in the first tower body.
6. the technique of the new catalytic method desulfuring and denitrifying apparatus according to claim 1 for coke oven flue gas, feature exist
In specific as follows:
Step 1: coke oven flue gas passes through the waste-heat recovery device, recycles waste heat of coke-oven flue gas with this, drops in coke oven flue gas
After low temperature, coke oven flue gas continues through flue gas quality regulating system, adjusts the temperature of coke oven flue gas and the humidity of coke oven flue gas with this,
Then the coke oven flue gas enters desulfurizing tower under the action of air blower；
Step 2: after the coke oven flue gas is from the smoke inlet of desulfurizing tower into the first tower body, via in hydrodesulfurisation catalyst layer 7
Desulphurization catalyst adsorbs the H in coke oven flue gas2O、SO2And O2, then clean flue gas is flowed out from exhanst gas outlet up to chimney is arranged
It puts；
Step 3: and it is adsorbed on the H on the desulphurization catalyst surface in hydrodesulfurisation catalyst layer2O、SO2And O2, generated through catalysis reaction
H2SO4, aqueous solution is extracted from regenerated reactor by regeneration pump in this way, is transmitted on the roof of the first tower body of the desulfurizing tower
Spray inlet enters, and desulphurization catalyst is rinsed with this, by the H on desulphurization catalyst2SO4It is transmitted to regenerated reactor from sulfuric acid outlet,
Until sulfuric acid concentration reaches setting value in regenerated reactor, relieving haperacidity is used to this or prepares sulfate；
Step 4: after rinsing desulphurization catalyst, desulphurization catalyst has just restored activity, extracts in this way using back blowing machine clean
Flue gas enters from air inlet, and the moisture on desulphurization catalyst surface is sent to chimney from air outlet；
Step 5: liquefied ammonia or ammonium hydroxide flash to gaseous state, then carry out air in a mixer with blower conveying by being pumped into evaporator
Mixing, ammonia therein are diluted to 5% or less；
Step 6: the flue gas being discharged from exhaust outlet enters oxidizing tower, by layer of oxidation catalyst, part NO and O2In oxidation catalyst
Under the catalytic action of the oxidation catalyst of layer, reaction generates NO2；
Step 7: the ammonia after dilution is by being uniformly mixed into cigarette in the pipeline for leading to denitrating tower with flue gas after ammonia-spraying grid AIG
Gas mixture, then the smoke mixture enters denitrating tower, and the smoke mixture first enters second from the second smoke inlet
Tower body, by lower catalytic oxidant layer, NOx and NH3Under the action of catalyst, reaction generates N2And H20, the flue gas after following reaction
Mixture is up walked, the NH to escape in smoke mixture3It is adsorbed by upper catalyst oxidant layer, flue gas is from the first exhanst gas outlet up to cigarette
Chimney discharge；NH is adsorbed to overlying catalyst3After saturation, switch gas inlet to allow smoke mixture to enter from the first smoke inlet
Second tower body, by upper catalyst oxidant layer, NOx and the lower NH with denitrating catalyst adsorption of denitrating catalyst effect3Reaction,
Generate N2And H20, the smoke mixture after reaction is walked downward, the NH to escape in smoke mixture3It is adsorbed by lower catalytic oxidant layer,
Flue gas is from the second exhanst gas outlet up to chimney is discharged.
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| CN107930387A (en) * | 2017-12-01 | 2018-04-20 | 江苏新中金环保科技股份有限公司 | A kind of coke oven flue gas integration desulfurization denitration system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107930387A (en) * | 2017-12-01 | 2018-04-20 | 江苏新中金环保科技股份有限公司 | A kind of coke oven flue gas integration desulfurization denitration system |
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Application publication date: 20190503 |