CN109589788A - A kind of Novel flue gas denitrating system - Google Patents
A kind of Novel flue gas denitrating system Download PDFInfo
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- CN109589788A CN109589788A CN201811482912.1A CN201811482912A CN109589788A CN 109589788 A CN109589788 A CN 109589788A CN 201811482912 A CN201811482912 A CN 201811482912A CN 109589788 A CN109589788 A CN 109589788A
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- flue gas
- denitration
- hot
- channel
- blast stove
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0052—Details for air heaters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The invention discloses a kind of Novel flue gas denitrating systems, including denitration reaction furnace body and denitration inlet flue gas channel, denitration inlet flue gas channel to be also connected with flue gas heating system；The flue gas heating system includes hot-blast stove, air distribution blower and burner；It is divided into three tunnels into the flue gas before heat exchanger: generates high-temperature flue gas in the burning zone of hot-blast stove by burner and combustion-supporting fuel all the way；The mixed wind section of hot-blast stove is entered by air distribution blower all the way and the high-temperature flue gas generated in burning zone mix and generates high temperature flue gas；Flue gas enters the high temperature flue gas generated after heat exchanger comes out with preceding two-way and is mixed into denitration inlet flue gas channel all the way.Novel flue gas denitrating system provided by the invention increases flue gas heating system by the front end in denitration inlet flue gas channel, so that the flue gas of out of stock denitration entrance uniformly mixes, stablizes flue-gas temperature, reduce the generation of nitride, to reach the recycling and reusing of flue gas, the efficiency of denitration is promoted.
Description
Technical field
The present invention relates to gas denitrifying technology fields, and in particular to a kind of Novel flue gas denitrating system.
Background technique
Selective catalytic reduction (SCR) denitration technology is in the world using gas denitrifying technology the most mature, with dress
The advantages that setting simple structure, good reliability, high denitration efficiency occupies in the world 80% or more denitrating flue gas market.
Catalyst is the most crucial part of SCR denitration system, and the quality of performance is directly related to the denitration effect of SCR,
The typical reaction temperature window of SCR denitration technology is 280~420 DEG C, and when temperature is higher than reaction temperature window, catalyst can be produced
Raw burn knot or crystalline polamer；When temperature is lower than reaction temperature window, the activity of catalyst is insufficient, reduces denitration efficiency, because
This, the inlet flue gas temperature for controlling out of stock system is the key point of the safe and efficient operation of SCR flue gas denitrification system.
Current SCR denitration system does not install promotion main road/bypass flue gas temperature adjustment mixing arrangement, does not take any correlation yet
Measure so that thermal diffusion process and concentration diffusion process of the flue gas in denitration inlet flue gas channel slowly carry out so that
When mixed flue gas is reached at first floor catalyst inlet, temperature field and distribution of concentration are uneven, directly affect catalyst performance,
It is unfavorable for the stable operation of SCR denitration system.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of Novel flue gas denitrating system, by denitration inlet flue gas
Flue gas heating system is arranged in the front end in channel, is heated up by heating furnace to flue gas, so that in denitration inlet flue gas channel
Flue gas is uniformly mixed, and is stablized the flue-gas temperature of denitration entrance, is improved the efficiency of denitration.
The technical solution adopted by the present invention are as follows:
A kind of Novel flue gas denitrating system, including vertical denitration reaction furnace, the vertical denitration reaction furnace includes that denitration is anti-
Furnace body and denitration inlet flue gas channel are answered, is equipped with multiple catalyst layers, the denitration reaction in the denitration reaction furnace body
Furnace body is connected with denitration inlet flue gas channel, and denitration inlet flue gas channel is also connected with flue gas heating system；It is described
Flue gas heating system includes hot-blast stove, air distribution blower and burner；The burner is mounted on the inside of hot-blast stove；The air distribution
Blower and denitration inlet flue gas channel are connected with hot-blast stove respectively；
It is divided into three tunnels into the flue gas before heat exchanger: is produced all the way by burner and combustion-supporting fuel in the burning zone of hot-blast stove
Raw high-temperature flue gas；It is mixed all the way by the mixed wind section that air distribution blower enters hot-blast stove with the high-temperature flue gas generated in burning zone
It closes and generates high temperature flue gas；Flue gas enters to be mixed into after heat exchanger comes out with the high temperature flue gas of preceding two-way generation and take off all the way
In nitre inlet flue gas channel.
As the preferred of the embodiment of the present invention, it is also connected with combustion fan in the front end of the burner, is exchanged heat from entering
A part is extracted in the flue gas of device enters burner by combustion fan.
As the preferred of the embodiment of the present invention, the burner is mounted on the position of hot-blast stove lower part, the connection of air distribution blower
In the position on hot-blast stove top.
As the preferred of the embodiment of the present invention, expansion joint, the expansion are installed on the smoke pipeline of the hot-blast stove
The front end of section is equipped with smoke distribution channel, and the smoke distribution channel is connected with denitration inlet flue gas channel.
As the preferred of the embodiment of the present invention, the smoke distribution channel is transversely evenly distributed with multiple smoke inlets, institute
It states the high temperature flue gas in smoke distribution channel and is entered in denitration inlet flue gas channel by smoke inlet and come out with from heat exchanger
Flue gas mixed in denitration inlet flue gas channel.
As the preferred of the embodiment of the present invention, it is equipped with flow straightening grid in the top of the catalyst layer, is entered in the denitration
The corner of mouth exhaust gases passes is equipped with deflector.
Compared with prior art, the beneficial effects of the present invention are:
Flue gas is arranged by the front end in denitration inlet flue gas channel in Novel flue gas denitrating system of the present invention
System will be used for combustion-supporting, the combustion-supporting fuel generation in the part original flue gas and burner into the part original flue gas before heat exchanger
High-temperature flue gas will be pumped into hot-blast stove by air distribution blower into the part original flue gas before heat exchanger, this two strands of flue gas (i.e. the first via and
Second tunnel) progress first time flue gas uniformly mixes in hot-blast stove；It is come out after evenly mixing by the first time flue gas of hot-blast stove
Mixed flue gas with the former flue gas come out from heat exchanger exit pipeline second of flue gas to be carried out in denitration inlet flue gas channel mixed
It closes, after evenly mixing by flue gas twice, mixes out of stock flue gas uniformly, stablize flue-gas temperature, formed and be suitble to denitrating technique
It is required that flue gas after enter Benitration reactor carry out denitration purified treatment, ensure that the uniformity of the temperature of mixed flue gas, promoted
The efficiency of denitrating flue gas.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for inventing a kind of Novel flue gas denitrating system；
Fig. 2 is the schematic enlarged-scale view in the portion A (smoke distribution channel) described in Fig. 1.
It is as shown in the figure: 100, vertical denitration reaction furnace, 101, denitration reaction furnace body, 102, denitration inlet flue gas channel,
103, catalyst layer, 104, flow straightening grid, 105, deflector, 200, flue gas heating system, 201, hot-blast stove, 202, air distribution wind
Machine, 203, burner, 204, combustion fan, 205, expansion joint, 206, smoke distribution channel, 207, smoke inlet, 300, heat exchanger.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that, term " on ", "lower", "front", "rear", "left", "right", "inner",
"outside", etc. instructions orientation or positional relationship be based on the orientation or positional relationship shown in the drawings, be merely for convenience of description this
Invention and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific side
Position construction and operation, therefore be not considered as limiting the invention.
Shown in Figure 1, the embodiment of the present invention provides a kind of Novel flue gas denitrating system, mainly includes vertical denitration reaction
200 two parts of furnace 100 and flue gas heating system；Wherein, vertical denitration reaction furnace 100 is connected with flue gas heating system 200.
Shown in Figure 1, in the present embodiment, vertical denitration reaction furnace 100 mainly includes 101 He of denitration reaction furnace body
102 two, denitration inlet flue gas channel part；Wherein, it is successively arranged multiple catalysis from bottom to up in denitration reaction furnace body 101
One end of oxidant layer 103, denitration inlet flue gas channel 102 is connect with denitration reaction furnace body 101, the other end and flue gas heating system
200 be connected (as shown in Figure 1, in the present embodiment, the rear end in denitration inlet flue gas channel 102 and vertical denitration reaction furnace 100
Connection, the front end in denitration inlet flue gas channel 102 is connected with the exhanst gas outlet pipeline of flue gas heating system 200 and heat exchanger 300
It connects).
Shown in Figure 1, in the present embodiment, flue gas heating system 200 mainly includes hot-blast stove 201, air distribution blower
202, burner 203；Wherein, burner 203 is mounted on the inside of hot-blast stove 201, and air distribution blower 202 and denitration inlet flue gas are logical
Road 102 is connected with hot-blast stove 201 respectively.Specifically in the present embodiment, air distribution blower 202 and denitration inlet flue gas channel
102 are connected with hot-blast stove 201.In the present embodiment, burner 203 is mounted on the position of 201 lower part of hot-blast stove, air distribution wind
Machine 202 is connected to the position on 201 top of hot-blast stove.
It is shown in Figure 1, in the present embodiment, it is divided into three tunnels into the flue gas before heat exchanger 300: where the first via: will
Into the part original flue gas before heat exchanger 300 for combustion-supporting, the combustion-supporting fuel in the part original flue gas and burner 203 generates high
Warm flue gas, (high-temperature flue gas generated in burning zone burner 203 in hot-blast stove 201 may be up to 800~1000 DEG C), in this reality
It applies in example, enters 203 Central Plains of burner by installing combustion fan 204 in the front end of burner 203 and can guarantee in the first via
The burning of flue gas is more abundant, reduces ignition temperature, effectively combustion process is inhibited to generate nitrogen oxides；Second tunnel: mainly pass through
The part original flue gas for entering heat exchanger 300 (temperature of former flue gas is 80 DEG C or so) is pumped into hot-blast stove 201 by air distribution blower 202
For increasing the outlet air quantity of flue gas in hot-blast stove 201,201 exit gas temperature of hot-blast stove is reduced；Pass through the first via and second
The flue gas on road mixes, so that 201 exit gas temperature of hot-blast stove is reduced to 650~700 DEG C or so；Third road: from heat exchanger 300
The former flue gas (flue-gas temperature come out from heat exchanger 300 can reach 250~280 DEG C) that outlet conduit comes out enters directly into denitration
In inlet flue gas channel 102.In the present embodiment, the first via and the second tunnel can be interpreted as bypath system, third road is managed
Solution is main road system, the exiting flue gas (bypass of the former flue gas (main road system) come out from 300 outlet conduit of heat exchanger and hot-blast stove
System) denitration inlet flue gas channel 102 is entered, second of flue gas mixing is carried out in denitration inlet flue gas channel 102, so that
Mixed denitration entrance flue gas temperature reaches 300~320 DEG C.
In the present embodiment, the first via (will be used for combustion-supporting, part original into the part original flue gas before heat exchanger 300
Combustion-supporting fuel in flue gas and burner 203 generates high-temperature flue gas) it is main that there are two purposes: 1, by burner 203 will it be entered
Part original flue gas before heat exchanger 300 is heated up (heating flue gas may be up to 800~1000 DEG C), to guarantee from burner
Flue gas in 203 enters the temperature in hot-blast stove 201；2, by taking multistage multiple time 203 entrance original flue gas of burner
The combustion-supporting wind system (increasing combustion fan 204) for receiving afterburning, can stablize flue-gas temperature, reduce the generation of nitride, to reach
To the effect of the recycling and reusing of flue gas；Second tunnel (will enter the part original cigarette of heat exchanger 300 by air distribution blower 202
Gas be pumped into hot-blast stove 201 in) main purpose increase hot-blast stove 201 intake, by air distribution blower 202 realize in hot-blast stove
The mixing section of 201 tail portions mixes 25000Nm380 DEG C of low-temperature flue gas (flue gas inlet is adjustable) before/h heat exchanger adjust hot-blast stove
The negative pressure of 201 internal furnaces.
In the present embodiment, realize that flue gas is mixed in the first time of hot-blast stove by bypath system (i.e. the first via and the second tunnel)
It closes.Specifically, entering the high-temperature flue gas in hot-blast stove 201 (up to by the flue gas (i.e. the first via) that burner 203 comes out
800~1000 DEG C) by the part low temperature original flue gas that will enter heat exchanger 300, (temperature is 80 DEG C of left sides with by air distribution blower 202
It is right) it is pumped into hot-blast stove 201 (i.e. the second tunnel), it carries out being sufficiently mixed for the first time in hot-blast stove 201.By in hot-blast stove 201
It is interior to carry out first time mixing so that being reduced to from hot-blast stove 201 to flue-gas temperature internal between denitration inlet flue gas channel 102
700 DEG C or less.Further optimization the present embodiment, due to negative pressure at hot-blast stove 201 and the mixed wind in denitration inlet flue gas channel 102
About -500Pa or so crosses wind area coefficient and considers by 0.5 to guarantee that hot-blast stove 201 stablizes burning, increases the left side 300Pa with this
Right resistance.25000Nm is mixed again in 201 tail portion mixing section of hot-blast stove380 DEG C of low-temperature flue gas before/h heat exchanger adjust hot-blast stove
The temperature of combustion chamber draft and mixed flue gas (mixed flue gas of the first via and the second road flue gas in hot-blast stove 201) in 201,
Simultaneously by the flue-gas temperature inside hot-blast stove 201 to denitration inlet flue gas channel 102 be reduced to 700 DEG C hereinafter, significantly improving
The effect of mixed wind.
In the present embodiment, the flue gas on the first via and the second tunnel is uniformly mixed by the first time flue gas in hot-blast stove 201
Afterwards, by the temperature of flue gas be down to 700 DEG C hereinafter, from hot-blast stove 201 come out flue gas with from 300 outlet conduit of heat exchanger come out
Former flue gas (i.e. third road) carries out second of flue gas mixing in denitration inlet flue gas channel 102 and (can be understood as main road system
Low-temperature flue gas uniformly mixed with the high-temperature flue gas of bypath system), so that the mixing in denitration inlet flue gas channel 102
After flue gas reaches the flue gas (300~320 DEG C) of suitable denitrating technique requirement, denitration purified treatment is carried out into Benitration reactor.
In the present embodiment, by flue gas heating system (can be understood as bypath system) to the part original cigarette before entering heat exchanger 300
Gas mixes out of stock flue gas uniformly, surely as combustion-supporting wind system (can carry out multistage repeatedly recycling afterburning according to the actual situation)
Determine flue-gas temperature, reduces the generation of nitride to reach the recycling and reusing of flue gas, promote denitration efficiency.
Referring to shown in Fig. 1 to 2, in the present embodiment, expansion joint 205 is installed on the smoke pipeline of hot-blast stove 201, it is swollen
The front end of swollen section is equipped with smoke distribution channel 206 (in the present embodiment, the length in smoke distribution channel 206 and flue width base
This maintains an equal level), multiple smoke inlets 207 (generally 6~8) are transversely evenly distributed on smoke distribution channel 206, in flue gas
High temperature flue gas in distribution channel 206 is entered by multiple smoke inlets 207 in denitration inlet flue gas channel 102 and from heat exchange
The flue gas that device 300 comes out 102 is mixed in denitration inlet flue gas channel.By adding smoke distribution channel 206 and more
A smoke inlet 207 and three horizontal labyrinth deflectors are set above the hot-wind inlet of cigarette in denitration inlet flue gas channel 102, reached
The uniformly mixed effect of cold and hot flue gas is realized in denitration inlet flue gas channel 102.
In the present embodiment, it is equipped with flow straightening grid 104 in the top of 101 inner catalyst layer 103 of denitration reaction furnace body,
The corner in denitration inlet flue gas channel 102 is equipped with deflector 105.The air-out direction of flow straightening grid 104 is anti-perpendicular to catalysis
The catalyst layer 103 in section is answered, 104 one side of flow straightening grid makes the Flow Field Distribution of 103 inlet section of catalyst layer more equal
It is even, on the other hand make mixed flue gas vertically into catalyst layer 103, to mitigate the erosive wear of catalyst layer 103.De-
The corner in nitre inlet flue gas channel 102 is additionally provided with deflector 105, the deflector 105 1 in denitration inlet flue gas channel 102
Aspect is for mitigating dust deposit in flue, the adjustable mixed flue gas flow field in denitration inlet flue gas channel 102 of another aspect.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (6)
1. a kind of Novel flue gas denitrating system, including vertical denitration reaction furnace (100), vertical denitration reaction furnace (100) packet
Denitration reaction furnace body (101) and denitration inlet flue gas channel (102) are included, is equipped in the denitration reaction furnace body (101) more
A catalyst layer (103), the denitration reaction furnace body (101) are connected with denitration inlet flue gas channel (102), and feature exists
In: denitration inlet flue gas channel (102) is also connected with flue gas heating system (200)；Flue gas heating system (200) packet
Include hot-blast stove (201), air distribution blower (202) and burner (203)；The burner (203) is mounted on the interior of hot-blast stove (201)
Portion；The air distribution blower (202) and denitration inlet flue gas channel (102) are connected with hot-blast stove (201) respectively；
It is divided into three tunnels into the flue gas before heat exchanger (300): all the way by burner (203) and combustion-supporting fuel in hot-blast stove
(201) burning zone generates high-temperature flue gas；All the way by air distribution blower (202) enter the mixed wind section of hot-blast stove (201) with
The high-temperature flue gas that burning zone generates carries out mixing and generates high temperature flue gas；Flue gas enters after heat exchanger (300) come out with before all the way
The high temperature flue gas that two-way generates is mixed into denitration inlet flue gas channel (102).
2. Novel flue gas denitrating system according to claim 1, it is characterised in that: in the front end of the burner (203)
Be also connected with combustion fan (204), from enter heat exchanger (300) flue gas in extract a part by combustion fan (204) into
Enter to burner (203).
3. Novel flue gas denitrating system according to claim 1, it is characterised in that: the burner (203) is mounted on heat
The position of wind furnace (201) lower part, air distribution blower (202) are connected to the position on hot-blast stove (201) top.
4. Novel flue gas denitrating system according to claim 1, it is characterised in that: the smoke in the hot-blast stove (201)
It is equipped on pipeline expansion joint (205), the front end of the expansion joint (205) is equipped with smoke distribution channel (206), the flue gas point
Cloth channel (206) is connected with denitration inlet flue gas channel (102).
5. Novel flue gas denitrating system according to claim 4, it is characterised in that: smoke distribution channel (206) edge
Laterally uniform to have multiple smoke inlets (207), the high temperature flue gas in the smoke distribution channel (206) passes through smoke inlet
(207) it enters in denitration inlet flue gas channel (102) and from the flue gas of heat exchanger (300) out in denitration inlet flue gas channel
(102) it is mixed in.
6. Novel flue gas denitrating system according to claim 1, it is characterised in that: in the upper of the catalyst layer (103)
Side is equipped with flow straightening grid (104), is equipped with deflector (105) in the corner in denitration inlet flue gas channel (102).
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| CN201811482912.1A CN109589788B (en) | 2018-12-05 | 2018-12-05 | Novel flue gas denitration system |
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