CN207913483U - A kind of coke oven flue gas low temperature SCR denitration and catalyst protect regenerative system online - Google Patents
A kind of coke oven flue gas low temperature SCR denitration and catalyst protect regenerative system online Download PDFInfo
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- CN207913483U CN207913483U CN201721734421.2U CN201721734421U CN207913483U CN 207913483 U CN207913483 U CN 207913483U CN 201721734421 U CN201721734421 U CN 201721734421U CN 207913483 U CN207913483 U CN 207913483U
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Abstract
A kind of coke oven flue gas low temperature SCR denitration of the utility model offer and catalyst protect regenerative system online, including：Reducing agent storage tank, two Benitration reactors, Liang Ge flue gases mixing chamber, spray ammonia chamber, an ammonia catching reaction device.For the sulfur poisoning deactivation prob using catalyst during preposition denitration technology route low temperature SCR denitration; SCR denitration reaction process, denitrating catalyst are protected online and decaying catalyst on-line regeneration process is integrated; using the method for flue gas flow direction inverible transform, realize that the denitration reaction process on denitrating catalyst and online protection, regenerative process are carried out at the same time in two Benitration reactors respectively.The inactivation period of catalyst can effectively be extended by the utility model, and effective on-line regeneration is carried out to the denitrating catalyst of inactivation, the denitrating catalyst of SCR denitration system parking dismounting inactivation is not needed, to ensure the operation steady in a long-term of SCR denitration system.
Description
Technical field
The utility model belongs to coke oven flue gas SCR method denitration technologies in field of energy environment, and in particular to a kind of coke oven cigarette
Gas low temperature SCR denitration and catalyst protect regenerative system online.
Background technology
China is the first in the world coke production big country, consumption big country and big export country, the coke-oven plants existing 800 Duo Jia, 2000
More coke ovens.The denitration technology of domestic contrast maturation is mainly used in thermal power industry at present, belongs to high temperature denitration, and coking
Chemical enterprise NOx emission is just able to pay attention to and administered recent years.The temperature of coke oven flue gas is relatively low.Because coke oven is in stove
Type, fuel type and operating duty etc. exist very big difference, so as to cause different coke-oven plants coke oven flue gas in temperature side
Face is there is very big difference, and coke oven flue gas temperature is down to 180 DEG C, up to 320 DEG C, but most of in 220-270 DEG C of section.It is domestic
The improvement of coke oven flue gas, it is preferred that emphasis is the improvement of sulfur-containing compound and NOx, generally use desulfurization technology and denitration technology are combined
Flue gas managing technique, sulfur removal technology after denitrating technique and preposition denitration can be divided into after preposition desulfurization.
Using denitrating technique after preposition desulfurization, desulfurizer is arranged in front end, no matter advantage is it is obvious that the desulfurization used
Technique is wet method, dry method, semidry method, and first the substances such as tar, carbon dust, coal dust, dust and ammonia salt substance can be got rid of,
Effectively reduce SO simultaneously3Negative effect to denitrating catalyst and pipeline.Theoretically, preposition desulfurization can be reduced to denitration
The influence of unit can effectively extend the service life of denitrification apparatus, but in actual operation, preposition desulfurization is brought direct
Problem is that flue-gas temperature is too low, especially " wet desulphurization+low-temperature denitration " do not have significant practical applications at all because must will be wet
80-100 DEG C of flue-gas temperature is increased to 180 DEG C or more after method desulfurization, and energy consumption sharply increases.And dry desulfurizing process is used, lead to
It crosses using flue gas heating process (energy consumption also increases, but acceptable), flue-gas temperature can be controlled in 200 DEG C or more, can meet reality
The demand of operation, but it is very high using the operating cost of dry desulfurization, bring great burden to enterprise.
Sulfur removal technology is then few more suitable for impurity after preposition denitration, slightly higher (air-flow when flue gas reaches Benitration reactor of temperature
Body temperature >=250 DEG C), the low (SO of sulfur-bearing2Content≤500mg/Nm3) coke oven flue gas.Its advantage is that it is simple for process, low energy consumption,
Flue gas does not have to heat treatment and is directly entered denitration catalyst unit denitration, is followed by wet desulfurizing process and theoretically can guarantee 99% or more
Desulfuration efficiency.Due to being influenced by coke oven blowby, when effluent gas temperature is less than 250 DEG C, flue gas composition reaction generates
Various ammonia salt substances are precipitated, and together with the substances wrapped folder such as tar, carbon dust, coal dust, dust, are easily attached to flue and denitration
Catalyst bed layer surface causes denitrification apparatus resistance to increase, catalyst activity reduction, and then influences the normal fortune of denitrification apparatus
Row.Therefore it in actual production operation, needs to take corresponding denitrating catalyst to protect and regenerate measure, to ensure denitrification apparatus
Operation steady in a long-term.
Take that the technical costs of preposition denitration is low, low energy consumption, it is deep to be welcome by enterprise.Commercial denitrating catalyst master domestic at present
It will be with for based on catalytic component based on vanadium, widely used be V2O5-WO3/TiO2Catalyst.The presence of vanadium easily leads to part cigarette
SO present in gas2It is catalytically oxidized to SO3, under lower temperature condition, it is adsorbed on the NH of catalyst surface3Easily and SO2/SO3
It reacts, generate ammonium hydrogen sulfate/ammonium sulfate and is attached to catalyst surface, blocking catalyst duct, and cover surface work
Property site, and then lead to catalyst activity reduction.Therefore often occur in the practical governance process of flue gas denitrating catalyst because
Sulfur poisoning and the phenomenon that inactivate, and then lead to the operation that denitrating system can not be steady in a long-term, need to regenerate catalyst
Processing.
The regeneration method of conventional inactivation denitrating catalyst includes mainly washing lotion method of reproduction, washing method of reproduction, Thermal desorption method
Deng.
SCR denitration regeneration method involved in the patent announced at present is more, such as in " CN102658215B "
" the cleaning and regeneration method " provided prepares SCR denitration of the cleaning solution to inactivation using specific surfactant and acid solution
Carrying out washing treatment is carried out, is impregnated later by specific regenerated liquid, dry and calcination process, completes the regeneration of catalyst.Patent
A kind of " cleaning and regeneration method " is also provided in " CN101574671 ", a kind of formula of regenerated liquid is disclosed, including metavanadic acid
Ammonium, ammonium paratungstate, surfactant and accelerating agent etc..In addition one kind is provided in patent " CN102814201A " by specific acid
Liquid and specific lye are with the use of the method for handling decaying catalyst.It is de- that a kind of SCR is disclosed in patent " CN105435862A "
The automatic cleaning process of nitre decaying catalyst discloses a kind of SCR denitration decaying catalyst in patent " CN103055962B "
Regeneration techniques route and equipment can efficiently accomplish the regeneration treatment of decaying catalyst.
Studies have shown that when handling decaying catalyst using Thermal desorption method under the conditions of certain temperature, the presence of NO can promote
The decomposition of ammonium sulfate on into catalyst surface, therefore a kind of effective treating method is exactly to be warming up to the coke oven flue gas of quasi- improvement
280 DEG C or more, it is directly entered SCR denitration bed, activation process is carried out to decaying catalyst.
However, above-mentioned regeneration treating method and the technique etc. for inactivating denitrating catalyst about SCR, is required to SCR denitration
Apparatus system stops, and whether the catalyst no matter inactivated is dismantled, is both needed to that after completing regeneration treatment SCR denitration device system could be run
System, causes denitrating system cannot long-term continuous and steady operation.Therefore, the online protection of SCR denitration device stable operation is not influenced
Just seem most important with the technology and technique of regenerated catalyst.
Utility model content
The utility model is directed to is asked using the inactivation of catalyst during preposition denitration technology route cold operation SCR denitration
Topic, by SCR denitration reaction process and catalyst is protected online and regenerative process integrates, using the side of flue gas flow direction inverible transform
Method proposes that a kind of coke oven flue gas low temperature SCR denitration and catalyst protect regenerative system online.Using the utility model proposes
SCR denitration is protected online and regenerative system.
To achieve the above object, the utility model proposes coke oven flue gas low temperature SCR denitration and catalyst online protection again
Raw system, including：Reducing agent storage tank, two Benitration reactors, Liang Ge flue gases mixing chamber, a spray ammonia chamber and an ammonia are caught
Catch reactor；It is respectively mounted flue gas mixing chamber between each Benitration reactor and spray ammonia chamber.Flue gas passes through denitration reaction
When device, denitration reaction process and protection regenerative process on catalyst are carried out at the same time in two Benitration reactors respectively.Denitration
Low-temperature denitration catalyst is loaded in reactor, it is preferential to use the DICP- researched and developed by Dalian Inst of Chemicophysics, Chinese Academy of Sciences
DNXTM- II type low-temperature denitration catalysts, denitration reaction temperature range are 180-300 DEG C.
It is equipped with reducing agent inlet ductwork 11, the reducing agent inlet tube between the reducing agent storage tank 100 and spray ammonia cavity C
Road 11 is equipped with reducing agent flow control valve V1；200 export pipeline of flue gas is separated into fume treatment pipeline 12 and flue gas non-process
Pipeline 13 is directly connected to next unit 300 by flue gas non-process pipeline 13, and the flue gas non-process pipeline 13 is equipped with cigarette
Gas shut-off valve V2；The fume treatment pipeline 12, which is separated into first and enters pipeline 14 and second, enters pipeline 15, respectively by the
One, which enters pipeline 14 and second, is connected into pipeline 15 on the first Benitration reactor A and the second Benitration reactor E, and described first
It is equipped with the first gas inlet shut-off valve V3 into pipeline 14, described second enters pipeline 15 ends equipped with the second gas inlet
Valve V5；It is respectively equipped with first outlet pipe between the first Benitration reactor A, the second Benitration reactor E and ammonia catching reaction device F
Road 16 and second outlet pipeline 17, the first outlet pipeline 16 are equipped with the first exhanst gas outlet shut-off valve V6, and described second goes out
Mouth pipeline 17 is equipped with the second exhanst gas outlet shut-off valve V4；The ammonia catching reaction device F is connected to down by general export pipeline 18
One unit 300；First Benitration reactor A and the second Benitration reactor E is mixed by the first flue gas mixing chamber B and the second flue gas
Chamber D is connected to spray ammonia cavity C.
The first denitrating catalyst G is loaded in the first Benitration reactor A, is arranged between the first denitrating catalyst G beds
First acoustic wave ash ejector H；The second denitrating catalyst M is loaded in second Benitration reactor E, between the second denitrating catalyst M beds
Second acoustic wave ash ejector N is set.
It is equipped with distributor O inside first flue gas mixing chamber B and the second flue gas mixing chamber D.
Distributor O quantity in first flue gas mixing chamber B or the second flue gas mixing chamber D is two pieces or more.
The distributor O is orifice plate P or screen Q or semilune baffle.
The reducing agent is ammonia or ammonium hydroxide or urea or hydrocarbon.
During low temperature SCR denitration continuous operation, changed according to the denitrification rate of catalyst, two denitrations of rotating at regular intervals are anti-
The front-end and back-end position for answering device, the catalyst to play front reaction device respectively is protected online, palingenesis and rear end are reacted
Device SCR methods remove the effect of NOx.Rotational cycle is depending on live denitration effect, usually 1-36 months, preferably 3-6 months.
The admission space of catalyst in Benitration reactor, the flow and gas body of the coke oven flue gas administered according to specific needs
Product air speed codetermines.The ranging from 1000-12000h of denitration reaction gas volume air speed-1, preferably gas volume air speed is
6000h-1Above, it can be achieved that the efficient utilization of denitrating catalyst.
The mounting means of catalyst in Benitration reactor, coke oven flue gas flow, the denitration reaction administered according to specific needs
Device size and catalyst installation volume codetermine.The general catalyst installation number of plies at two layers or more, optimum selecting three-layer or three layers with
On.
Acoustic wave ash ejector is set in Benitration reactor, and acoustic wave ash ejector is mounted on the centre of two layers of catalyst.Sonic soot blowing
Device each run 30-60 seconds, interval are 0.5-24 hours, preferably 0.5-2 hours.
Along flow of flue gas direction, carry out that flue gas is installed between the Benitration reactor of denitration reaction and spray ammonia chamber in rear end
Mixed distribution chamber.Setting distribution device assembly in flue gas mixed distribution chamber, to ensure being sufficiently mixed and mixing for flue gas and ammonia
Close gas being uniformly distributed in the radial direction in Benitration reactor.
During coke oven flue gas low-temperature denitration continuous operation, the coke oven flue gas for intending administering is continuously across two denitration reactions
Device is arranged in the Benitration reactor of front end along flow of flue gas direction and carries out the online protection and regeneration of catalyst, be arranged rear
Low-temperature denitration reaction is carried out in the Benitration reactor at end.If catalyst does not inactivate, the main function of front reaction device be
Line guard catalyst, if deactivation phenomenom occurs in catalyst, the main function of front reaction device is on-line regeneration catalyst.It is logical
The switch for crossing the gas inlet valve and outlet valve of two Benitration reactors of control can adjust the coke oven flue gas of quasi- improvement
Flow direction, realize each Benitration reactor can be used as front reaction device carry out catalyst online protection and regeneration and
Low temperature SCR denitration reaction, which is carried out, as rear end reactor administers flue gas.
The utility model has following beneficial effect：
The utility model can effectively solve higher concentration SO during preposition denitration smoke gas treatment2(300-1000mg/
Nm3) caused by catalyst poisoning problem, it can be achieved that (1) protects low-temperature denitration catalyst online, effectively extend catalyst
The inactivation period；(2) on-line regeneration is carried out to the denitrating catalyst of inactivation, does not need SCR denitration system parking dismounting inactivation
Denitrating catalyst, it is ensured that the operation steady in a long-term of SCR denitration system.
Description of the drawings
Fig. 1 is the schematic diagram that a kind of coke oven flue gas low temperature SCR denitration and catalyst protect regenerative system online；
Fig. 2 is that a kind of coke oven flue gas low temperature SCR denitration and catalyst protect the flow of regenerative system and technique to illustrate online
Figure；
Fig. 3 is DICP-DNXTM- II type low-temperature denitration catalyst Performances (NO=NH3=750ppm, 8.7%O2,
17.4%H2O)；
Fig. 4 is DICP-DNXTM- II type low-temperature denitration catalysts NH3-SO2Pressure poisons processing and NO Thermal desorption performances are examined
Examine (GHSV=10000h-1, NO=NH3=750ppm, SO2=200ppm, 8.7%O2, 17.4%H2O)；
Fig. 5 is flue gas mixing chamber and distributor component diagram；
In figure：100, reducing agent storage tank；200, flue gas；300, next unit；A, the first Benitration reactor；B, the first flue gas
Mixing chamber；C, ammonia chamber is sprayed；D, the second flue gas mixing chamber；E, the second Benitration reactor；F, ammonia catching reaction device；G, first
Denitrating catalyst；H, the first acoustic wave ash ejector；M, the second denitrating catalyst；N, the second acoustic wave ash ejector；O, distributor；P, hole
Plate；Q, screen；
11, reducing agent inlet ductwork；12, fume treatment pipeline；13, flue gas non-process pipeline；14, first enters pipeline；
15, second enters pipeline；16, first outlet pipeline；17, second outlet pipeline；18, general export pipeline；V1, reduction agent flux tune
Save valve；V2, flue gas shut-off valve；V3, the first gas inlet shut-off valve；V4, the second exhanst gas outlet shut-off valve；V5, the second flue gas into
Mouth shut-off valve；V6, the first exhanst gas outlet shut-off valve.
Specific implementation mode
The utility model will be further described below, but therefore not limit the utility model.
Coke oven flue gas low temperature SCR denitration and catalyst provided by the utility model protect regenerative system online, such as Fig. 1 institutes
Show, including：Reducing agent storage tank, two Benitration reactors, Liang Ge flue gases mixing chamber, a spray ammonia chamber and an ammonia capture anti-
Answer device.Low-temperature denitration catalyst is loaded in Benitration reactor, and cigarette is respectively mounted between each Benitration reactor and spray ammonia chamber
Gas mixing chamber.Ammoxidation catalyst is loaded in ammonia catching reaction device.When flue gas passes through Benitration reactor, the SCR on catalyst
Denitration reaction process and the protection regenerative process of catalyst are carried out at the same time in two Benitration reactors respectively.
Coke oven flue gas low temperature SCR denitration and catalyst provided by the utility model protect regenerative system online, and what is be related to goes back
Former agent includes ammonia, ammonium hydroxide, urea, hydrocarbon etc., to describe the problem conveniently, ammonium hydroxide used herein as reducing agent,
But and it is not so limited reducing agent type used in the utility model.
As shown in Fig. 2, being set between the first denitrating catalyst G, the first denitrating catalyst G of filling in the first Benitration reactor A
Set and load the second denitrating catalyst M in the first acoustic wave ash ejector H, the second Benitration reactor E, the second denitrating catalyst M beds it
Between the second acoustic wave ash ejector N is set.The loadings of catalyst are needed according to the quasi- coke oven flue gas flow administered and specific denitration catalyst
The optimal gas volume space velocity operating range of agent codetermines, and the mounting means of catalyst then needs the specific ruler of binding reactor
Very little and catalyst loadings determine.Acoustic wave ash ejector is usually set above catalyst bed, in addition, urging for every two layers in principle
Acoustic wave ash ejector is also set among agent, acoustic wave ash ejector is determined in combination with the smoke content in the quasi- coke oven flue gas administered
Installation site and quantity.
Enter SCR denitration reactor as shown in Fig. 2, needing the coke oven flue gas administered that can pass through fume treatment pipeline 12 and take off
Oxynitrides denitration process is carried out in nitre system, it can also be by flue gas non-process pipeline 13 by SCR denitration system short circuit, directly
It taps into next unit.
Entering SCR denitration system and denitrating catalyst to coke oven flue gas below, protection and regenerative process illustrate online,
But it is not intended to limit the utility model patent.
As shown in Fig. 2, the quasi- coke oven flue gas administered passes through fume treatment pipeline 12, it is divided into two and respectively enters the second flue gas
Outlet shutoff valve V4 and the second gas inlet shut-off valve V5.The first gas inlet is arranged on the second exhanst gas outlet shut-off valve V4 to cut
Only valve V3, flue gas enter by the first gas inlet shut-off valve V3 in the first Benitration reactor A, enter on pipeline 15 second and set
The second gas inlet shut-off valve V5 is set, flue gas enters by the second gas inlet shut-off valve V5 in the second Benitration reactor E.First
First outlet pipeline 16 is connected on Benitration reactor A, and first exhanst gas outlet shut-off valve V6, denitration are set on first outlet pipeline 16
Flue gas afterwards enters by the first exhanst gas outlet shut-off valve V6 in ammonia catching reaction device F, passes through general export pipeline 18 later and enters
Next unit 300.Second outlet pipeline 17 is connected on second Benitration reactor E, and second flue gas is set on second outlet pipeline 17
Outlet shutoff valve V4, the flue gas after denitration enter in ammonia catching reaction device F by the second exhanst gas outlet shut-off valve V4, pass through later
General export pipeline 18 enters next unit 300.
By to the first gas inlet shut-off valve V3 and the second gas inlet shut-off valve V5 and the second exhanst gas outlet shut-off valve
The switch-mode regulation of V4 and the first exhanst gas outlet shut-off valve V6, it can be achieved that the first Benitration reactor A and the second Benitration reactor E both
It can be used as catalyst protection and regeneration reactor in front end, and can be in rear end as oxynitrides SCR denitration reactor
It uses.
When the first gas inlet shut-off valve V3 and the second exhanst gas outlet shut-off valve V4 are opened, the second gas inlet shut-off valve V5
When being closed with the first exhanst gas outlet shut-off valve V6, intends the coke oven flue gas administered and mixed by the first Benitration reactor A, the first flue gas
After chamber B, into spray ammonia cavity C, at the same time, ammonium hydroxide is entered by reducing agent inlet ductwork 11 in spray ammonia cavity C, coke oven cigarette
Gas is pre-mixed with ammonia vapor in spraying ammonia cavity C, enters in the second flue gas mixing chamber D be sufficiently mixed, uniformly later
Distribution eventually enters into progress SCR denitration reaction in the second Benitration reactor E, and SCR reaction end gas is after ammonia catching reaction device F
Into next unit 300.In the process, the first denitrating catalyst G loaded in the first Benitration reactor A is in online protection
Or reproduced state.If the first denitrating catalyst G is not inactivated, the main function of the first Benitration reactor A is online protection
Catalyst, if deactivation phenomenom occurs in the first denitrating catalyst G, the main function of the first Benitration reactor A is on-line regeneration
Catalyst.
When the second gas inlet shut-off valve V5 and the first exhanst gas outlet shut-off valve V6 are opened, the first gas inlet shut-off valve V3
When being closed with the second exhanst gas outlet shut-off valve V4, intends the coke oven flue gas administered and mixed by the second Benitration reactor E, the second flue gas
After chamber D, into spray ammonia cavity C, at the same time, ammonium hydroxide is entered by reducing agent inlet ductwork 11 in spray ammonia cavity C, coke oven cigarette
Gas is pre-mixed with ammonia vapor in spraying ammonia cavity C, enters in the first flue gas mixing chamber B be sufficiently mixed, uniformly later
Distribution eventually enters into progress SCR denitration reaction in the first Benitration reactor A, and SCR reaction end gas is after ammonia catching reaction device F
Into next unit 300.In the process, the second denitrating catalyst M loaded in the second Benitration reactor E is in protection or again
Raw state.If the second denitrating catalyst M is not inactivated, the main function of the second Benitration reactor E is that online protection is catalyzed
Agent, if deactivation phenomenom occurs in the second denitrating catalyst M, the main function of the second Benitration reactor E is catalyzed for on-line regeneration
Agent.
DICP-DNX of the utility model to be researched and developed by Dalian Inst of Chemicophysics, Chinese Academy of SciencesTM- II type low temperature is de-
It remarks additionally to the utility model for denox catalyst, but and is not so limited denitration catalyst used in the utility model
Agent.
The actual use gas volume air speed of domestic commerce denitrating catalyst is controlled substantially in 3000h at present-1Hereinafter, and
DICP-DNXTMThe actual use gas volume air speed of-II type low-temperature denitration catalysts can reach 6000h-1More than, such as Fig. 3 institutes
Show, in NO=NH3=750ppm, O2Under conditions of content is 8.7%, water content is 17.4%, when gas volume air speed is
6000h-1When, denitrification rate at 225 DEG C close to 90%, when flue-gas temperature reaches 250 DEG C, even gas volume air speed liter
Height arrives 10000h-1When, denitrification rate remains to reach 95%.
" pressure poisons-Thermal desorption regeneration " circulation experiment method is used to investigate DICP-DNX belowTM- II type low-temperature denitrations are catalyzed
The regenerability of agent, it is further to the utility model to be remarked additionally, but and be not so limited used in the utility model
Denitrating catalyst.
Using gas volume air speed GHSV=10000h-1、O2Content is 8.7%, water content 17.4%, NO=750ppm
Experiment condition, carry out " NH at different temperatures3-SO2" force to poison experiment and the experiment cycle investigation of NO- Thermal desorptions.It is first
First, it is added without NO, keeps remaining raw material constant, 750ppm NH are passed through at 250 DEG C3With 200ppm SO2, it handles 12 hours, it
Activity is investigated afterwards.After activity is investigated, it is added without NH3And SO2, keep remaining raw material constant, 750ppm NO be passed through, 250
It is handled 12 hours at DEG C, investigates performance later.Same " pressure poisons-Thermal desorption regeneration " has been carried out under the conditions of 210 DEG C to follow
Ring investigates experiment.As shown in figure 4, at either 210 DEG C or 250 DEG C, " NH3-SO2" force poison experiment lead to catalyst
Performance is decreased obviously, and after 210 DEG C of NO Thermal desorptions 12 hours, catalyst activity restores substantially, and passes through 250 DEG C of conditions
After lower 12 hours Thermal desorptions experiment, the activity of catalyst is restored completely.
Coke oven flue gas low temperature SCR denitration and catalyst provided by the utility model protect regenerative system online, and what is be related to is mixed
Chamber is closed, main function is the reducing agent (such as ammonia vapor) for reinforcing the coke oven flue gas of quasi- improvement and SCR method denitrations use
Be sufficiently mixed, and mixed gas is redistributed, to ensure that flue gas and ammonia vapor gaseous mixture enter Benitration reactor
When interior in Benitration reactor being uniformly distributed radially, and then ensure the availability of denitrating catalyst.Flue gas and ammonium hydroxide steam
First flue gas mixing chamber B of vapour and the second flue gas mixing chamber D, inside is respectively provided with distributor O, shown in Fig. 5, distributor O master
It to be made of two or more than two orifice plate P or screen Q, the distribution grid of other forms can also be used, such as semilune baffle
Deng.
The distributor O in the utility model is described further with specific example below, but it is new to be not intended to limit this practicality
Type.For example, one piece of orifice plate P is arranged at the position on the lower side of the first flue gas mixing chamber B), in the position of the top 0.5-1m of orifice plate P
Setting two pieces of screen Q, two pieces of screen Q are installed in such a way that duct is vertical, and clipping room is away from for 0.5-1m.
Coke oven flue gas low temperature SCR denitration and catalyst provided by the utility model protect regenerated reactor, system online
And technique, the ammonia catching reaction device F being related to can be selected, as the case may be when ammonia concentration is less than in SCR denitration tail gas
When 3ppm, ammonia catching reaction device can not have to, when ammonia concentration is higher in SCR denitration tail gas, when especially greater than 10ppm,
Ammonia catching reaction device must be used, to ensure that SCR whole system general export ammonia concentrations are less than 3ppm, reaches the ammonia of national regulation
Escape index request.
Above-described embodiment is only the technical concepts and features for illustrating the utility model, and its object is to allow be familiar with technique
Personage can understand the content of the utility model and implement according to this, the scope of protection of the utility model can not be limited with this.
It is all according to equivalent change or modification made by the spirit of the present invention essence, should all cover the scope of protection of the utility model it
It is interior.
Claims (8)
1. a kind of coke oven flue gas low temperature SCR denitration and catalyst protect regenerative system online, it is characterised in that：The system packet
It includes：Reducing agent storage tank, two Benitration reactors, Liang Ge flue gases mixing chamber, a spray ammonia chamber and an ammonia catching reaction device；
Low-temperature denitration catalyst is loaded in the Benitration reactor, and flue gas is respectively mounted between each Benitration reactor and spray ammonia chamber
Mixing chamber, ammonia catching reaction device is interior to load ammoxidation catalyst；When flue gas passes through Benitration reactor, the denitration on catalyst is anti-
Process and protection regenerative process is answered to be carried out at the same time in two Benitration reactors respectively.
2. a kind of coke oven flue gas low temperature SCR denitration described in accordance with the claim 1 and catalyst protect regenerative system online, special
Sign is：Reducing agent inlet ductwork (11), the reducing agent are equipped between the reducing agent storage tank (100) and spray ammonia chamber (C)
Inlet ductwork (11) is equipped with reducing agent flow control valve (V1)；Flue gas (200) export pipeline is separated into fume treatment pipeline
(12) and flue gas non-process pipeline (13) next unit (300), the cigarette, are directly connected to by flue gas non-process pipeline (13)
Gas non-process pipeline (13) is equipped with flue gas shut-off valve (V2)；The fume treatment pipeline (12) is separated into first and enters pipeline
(14) and second enters pipeline (15), and it is de- to be connected to first into pipeline (14) and second into pipeline (15) by first respectively
On nitre reactor (A) and the second Benitration reactor (E), described first, which enters pipeline (14), is equipped with the first gas inlet shut-off valve
(V3), described second enters pipeline (15) equipped with the second gas inlet shut-off valve (V5)；First Benitration reactor (A),
First outlet pipeline (16) and second outlet pipeline are respectively equipped between second Benitration reactor (E) and ammonia catching reaction device (F)
(17), the first outlet pipeline (16) is equipped with the first exhanst gas outlet shut-off valve (V6), on the second outlet pipeline (17)
Equipped with the second exhanst gas outlet shut-off valve (V4)；The ammonia catching reaction device (F) is connected to next list by general export pipeline (18)
First (300)；First Benitration reactor (A) and the second Benitration reactor (E) pass through the first flue gas mixing chamber (B) and the second flue gas
Mixing chamber (D) is connected to spray ammonia chamber (C).
3. a kind of coke oven flue gas low temperature SCR denitration and catalyst protect regenerative system online according to claim 2, special
Sign is：The first denitrating catalyst of filling (G) in first Benitration reactor (A), between the first denitrating catalyst (G) bed
First acoustic wave ash ejector (H) is set；The second denitrating catalyst of filling (M), the second denitrating catalyst in second Benitration reactor (E)
(M) the second acoustic wave ash ejector (N) is set between bed.
4. a kind of coke oven flue gas low temperature SCR denitration and catalyst protect regenerative system online according to claim 2, special
Sign is：It is equipped with distributor (O) inside first flue gas mixing chamber (B) and the second flue gas mixing chamber (D).
5. a kind of coke oven flue gas low temperature SCR denitration and catalyst protect regenerative system online according to claim 4, special
Sign is：Distributor (O) quantity in first flue gas mixing chamber (B) or the second flue gas mixing chamber (D) is two pieces
More than.
6. a kind of coke oven flue gas low temperature SCR denitration and catalyst protect regenerative system online according to claim 4, special
Sign is：The distributor (O) is orifice plate (P) or screen (Q) or semilune baffle.
7. a kind of coke oven flue gas low temperature SCR denitration described in accordance with the claim 3 and catalyst protect regenerative system online, special
Sign is：First denitrating catalyst (G) and the second denitrating catalyst (M) produce for Dalian Chemiclophysics Inst., Chinese Academy of Sciences
Load type overall configuration DICP-DNXTM- II type low-temperature denitration catalysts, denitration reaction temperature range are 180-300 DEG C.
8. a kind of coke oven flue gas low temperature SCR denitration described in accordance with the claim 1 and catalyst protect regenerative system online, special
Sign is：The reducing agent is ammonia or ammonium hydroxide or urea or hydrocarbon.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109821416A (en) * | 2019-03-28 | 2019-05-31 | 东北大学 | A kind of method and system of low-temperature flue gas removing nitrogen oxides |
| CN109908718A (en) * | 2017-12-13 | 2019-06-21 | 中国科学院大连化学物理研究所 | A kind of coke oven flue gas low temperature SCR denitration and catalyst protect regenerative system online |
| CN112169581A (en) * | 2019-07-04 | 2021-01-05 | 中冶长天国际工程有限责任公司 | Flue gas treatment method and system for on-line regeneration of SCR (Selective catalytic reduction) catalyst |
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2017
- 2017-12-13 CN CN201721734421.2U patent/CN207913483U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109908718A (en) * | 2017-12-13 | 2019-06-21 | 中国科学院大连化学物理研究所 | A kind of coke oven flue gas low temperature SCR denitration and catalyst protect regenerative system online |
| CN109908718B (en) * | 2017-12-13 | 2024-08-16 | 中国科学院大连化学物理研究所 | Coke oven flue gas low temperature SCR denitration and catalyst on-line protection regeneration system |
| CN109821416A (en) * | 2019-03-28 | 2019-05-31 | 东北大学 | A kind of method and system of low-temperature flue gas removing nitrogen oxides |
| CN112169581A (en) * | 2019-07-04 | 2021-01-05 | 中冶长天国际工程有限责任公司 | Flue gas treatment method and system for on-line regeneration of SCR (Selective catalytic reduction) catalyst |
| CN112169581B (en) * | 2019-07-04 | 2023-03-17 | 中冶长天国际工程有限责任公司 | Flue gas treatment method and system for on-line regeneration of SCR (Selective catalytic reduction) catalyst |
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