CN209348416U - A kind of de- CO system of sintering flue gas and desulfurizing and denitrifying - Google Patents
A kind of de- CO system of sintering flue gas and desulfurizing and denitrifying Download PDFInfo
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- CN209348416U CN209348416U CN201822036358.6U CN201822036358U CN209348416U CN 209348416 U CN209348416 U CN 209348416U CN 201822036358 U CN201822036358 U CN 201822036358U CN 209348416 U CN209348416 U CN 209348416U
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- 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
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Abstract
The utility model relates to a kind of sintering flue gas and desulfurizing and denitrifyings to take off CO system, flue gas after former main exhauster passes through after GGH heat exchanger, after being warming up to 320 DEG C, removing NOx is carried out into middling temperature DeNOx device, flue gas after denitration enters back into the de- CO device of catalysis, since catalysis reaction is exothermic reaction, temperature after de- CO rises to 420 DEG C, high-temperature flue gas exchanges heat in the high temperature side of GGH flue gas heat-exchange unit 1 with former low-temperature flue gas, exhanst gas outlet after heat exchange is 270 DEG C, the flue gas enters boiler, flue gas heat exchange is cooled to 160 DEG C, SO2 is removed into desulfurizing tower, efficient electric defroster is finally entered back into go out dust and droplet, make flue gas qualified discharge.According to the system, SO2Concentration of emission can be in 35mg/Nm3Hereinafter, NOx emission concentration can be in 50mg/Nm3Hereinafter, CO concentration of emission can be in 100mg/Nm3Hereinafter, dust emission concentration can be in 10mg/Nm3Below.
Description
Technical field
The utility model relates to a kind of sintering flue gas and desulfurizing and denitrifyings to take off CO system.Belong to chemical industry and environmental protection technology neck
Domain.
Background technique
More effectively to administer coke oven flue gas atmosphere polluting problem, China comes into effect " coking from January 1st, 2015
Learn emission of industrial pollutants standard " (GB16171-2012).The standard requirements coke oven flue gas nitrogen oxides and sulfur dioxide (SO2) emissions
Lower than 500mg/Nm3And 50mg/Nm3.New standard has been carried out nearly 3 years at present, but the actual emission reduction effect of coking industry and bad,
Coking smoke pollution problem is still extremely serious.Only a small number of enterprises are mounted with desulfurizer, only a few enterprise in coking industry
It is mounted with denitrification apparatus.
Currently, domestic more mature denitrating technique is SCR technology and selective non-catalytic reduction skill
Art.Selective non-catalytic reduction technology needs carry out in 800~1200 DEG C of temperature ranges, with coking industry real work item
Part differs greatly.The widely used SCR technology temperature range of power plant is 300~420 DEG C at present, and coke oven is useless
Flue-gas temperature is relatively low, and generally below 250 DEG C, if carrying out denitration, denitration using catalyst common in power plant system
Efficiency is very low, is unable to satisfy requirement, low temperature catalyst comes into being as a result,.Currently, dedicated for the denitration catalyst of coking industry
Agent has stable denitration effect at 200 DEG C.The NH in flue is sprayed under the effect of the catalyst3With the nitrogen oxidation in flue gas
Following two reaction occurs for object:
4NO+4NH3+O2→4N2+6H2O
6NO2+8NH3→7N2+12H2O
However in 200~300 DEG C of temperature range, under same catalyst action, other chemical reaction hairs are also had
It is raw:
2SO2+O2→2SO3
NH3+H2O+SO3→NH4HSO4
Reaction product hydrogen sulfate ammonia is a kind of sticky mass, is easily adhered in catalyst surface, and two aspects are generated
Adverse effect: first, the thick substances easily block the micropore of catalyst surface, the response area of catalyst is reduced, reduces catalysis
Efficiency；Second, the thick substances can also adsorb dust, increase volume, block the hole of catalyst, flue gas circulating pressure is caused to increase
Greatly, the stability of system is reduced.
The method for solving hydrogen sulfate ammonia blocking catalyst is catalyst Thermal desorption, and conventional method is every a period of time (depending on real
Differ within border stopping state every 1~4 month) flue gas is warming up to 340 DEG C, hydrogen sulfate ammonia can distil as gas after heating with flue gas
Discharge, heating 4~8 hours of duration are differed.However coking industry special-purpose catalyst is formulated best catalytic temperature 240
~260 DEG C or so, when temperature reaches 300 DEG C, the efficiency of catalyst starts to reduce, and is pyrolyzed eutectoid temperature when temperature reaches catalyst
When, catalytic efficiency is greatly reduced.Thus, during catalyst Thermal desorption, the denitration efficiency of coke oven is greatly reduced.In addition, catalysis
Agent has certain service life, needs to regularly replace, if arranging coke oven to stop production to cooperate the replacement repair time of catalyst, enterprise is raw
Producing benefit can also have a greatly reduced quality.
Therefore, it needs to propose a kind of denitration reaction that can improve catalyst service efficiency and do not sacrifice the coke oven production time
Device and method of denitration.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of sintering flue gas for the above-mentioned prior art to take off simultaneously
Sulphur denitration takes off CO system, is guaranteeing SO2, NOx, CO, the discharge of pollutants super low concentration such as dust while, and waste heat can be utilized
Steam boiler generates steam, gives the certain economic benefit of enterprise's bring, saves energy consumption.
A kind of the technical scheme in the invention for solving the above technical problem are as follows: de- CO of sintering flue gas and desulfurizing and denitrifying
System, mainly includes GGH flue gas heat-exchange unit, and SCR denitration device is catalyzed de- CO device, waste heat steam boiler, air-introduced machine, blast furnace
Gas burner, desulfurizing tower, efficient electric defroster and chimney, after sintering flue gas is come out by the sintering large flue of sintering machine, in master
The low temperature side of GGH flue gas heat-exchange unit, the low temperature of GGH flue gas heat-exchange unit are entered under the action of exhaust fan after electric precipitator
Side outlet is connected with the SCR denitration device entrance of medium temperature, and high temperature sintering flue gas heats up in the low temperature side of GGH flue gas heat-exchange unit
After be passed through in SCR denitration device and carry out denitration process, the outlet of SCR denitration device is connected with de- CO device portal is catalyzed, denitration
Flue gas afterwards enters the de- CO device of catalysis and carries out de- CO processing, described to be catalyzed de- CO device outlet and GGH flue gas heat-exchange unit
High temperature side entrance is connected, and the high temperature side outlet of GGH flue gas heat-exchange unit is connected with the entrance of waste heat steam boiler, waste heat steam boiler
Outlet be connected with the entrance of external air-introduced machine, the outlet of air-introduced machine is connected with desulfurizing tower entrance, in the case where air-introduced machine is acted on by cigarette
Pneumatic transmission enters desulfurizing tower and carries out desulfurization process, and the desulfurizing tower outlet is connected with efficient electric defroster, the flue gas after demisting is handled
It is discharged by chimney.
Preferably, it is arranged between SCR denitration device gas approach and the exhaust pass of the low temperature side of GGH flue gas heat-exchange unit
Blast furnace gas burner.
Preferably, the SCR denitration device and to be catalyzed de- CO device include fixed bracket and reacting cylinder body, it is described anti-
Cylinder is answered to be vertically installed on fixed bracket, smoke inlet and outlet are arranged up and down, are provided on the outside of the reacting cylinder body
Uptake flue, the uptake flue are connected with the pod above reacting cylinder body, in the reacting cylinder body from top to bottom uniformly
It is disposed with catalyst and shelves plate, shelved in each catalyst and be placed with corresponding catalyst on plate.
Preferably, it is shelved in the catalyst and is provided with multiple spaced apart steam sootblowers below plate, to go
Except the dust stratification of reacting cylinder body.
Preferably, the catalyst is shelved plate and is arranged in reacting cylinder body with drawer type, cleans convenient for the taking-up of catalyst
And replacement.
Compared with the prior art, the advantages of the utility model are:
Technology provided by the utility model is that advanced desulphurization denitration takes off CO integrated technique, thoroughly solves SO2、NOx、
CO and the problem of dust.The existing wet desulfurizing process of major part steel mill can only solve SO at present2The problem of, and not can solve
NOx, CO and the problem of dust.There is fraction steel mill to save the energy and be equipped with low-temperature denitration device, but low-temperature denitration is catalyzed
The disadvantages of agent denitration efficiency is low, and technology is immature, catalyst easy in inactivation, so low temperature catalyst popularity rate is not high, this is practical
Novel to use Medium temperature SCR catalyst, denitration efficiency is higher, and technology is the most mature.The window temperature of combined denitration reaction, further
Remove CO, innovation.The system is not to secondary pollution is generated, and low to device parameter requirement, equipment is easy to maintain, economy section
Can, it is stable, the contaminant problems such as enterprise SO2, NOx and CO can be substantially improved.
The system has the advantage that
(1) it is high-efficient to take off CO.The de- CO catalyst of my company's independent research, is changed in traditional catalyst process
Into addition noble metal material improves catalytic performance, it will be apparent that improve the efficiency of catalysis, the decarburization efficiency of existing CO catalyst is reachable
95% or more.
(2) denitration efficiency is high.Middling temperature DeNOx engineering is current denitration efficiency highest, and technology is the most mature, and technique is the most
Reliable technology, denitration efficiency guarantee exit concentration in 50mg/m3 or less up to 90% or more.
(3) system energy consumption is relatively low.Due to decarbonization system formula exothermic reaction, exothermic temperature is made full use of, is utilized
GGH significantly saves the energy.It only needs to mend right device heating appropriate using blast furnace gas when flue gas tentatively heats up
?.Relative to the simple mode for using flue gas, blast furnace gas dosage greatly reduces.
(4) energy consumption of steel mill is saved.The outlet of GGH flue gas heat-exchange unit is 270 DEG C, be can produce using boiler a large amount of low
Steam is pressed, in the steel industry that the energy compares deflation, the energy can have been saved to provide a part of steam in steel plant.
Detailed description of the invention
Fig. 1 is the system structure diagram in the utility model embodiment.
Fig. 2 is the structural schematic diagram of SCR denitration device or the de- CO device of catalysis in the utility model embodiment.
Wherein:
GGH flue gas heat-exchange unit 1, SCR denitration device 2 are catalyzed de- CO device 3, waste heat steam boiler 4, air-introduced machine 5, blast furnace
Gas burner 6, desulfurizing tower 7, efficient electric defroster 8, chimney 9, sintering machine 10, main exhauster 11, electric precipitator 12, fixed branch
Frame 101, reacting cylinder body 102, uptake flue 103, pod 104, catalyst shelve plate 105, steam sootblower 106.
Specific embodiment
The utility model is described in further detail below in conjunction with figure embodiment.
As shown in Figure 1, one of the present embodiment sintering flue gas and desulfurizing and denitrifying takes off CO system, it mainly include GGH cigarette
Gas heat exchanger 1, SCR denitration device 2 are catalyzed de- CO device 3, waste heat steam boiler 4, air-introduced machine 5, blast furnace gas burner 6, take off
Sulphur tower 7, efficient electric defroster 8 and chimney 9 form.
As shown in Fig. 2, the SCR denitration device 2 and the de- CO device 3 of catalysis include fixed bracket 101 and reaction tube
Body 102, the reacting cylinder body 102 are vertically installed on fixed bracket 101, and smoke inlet and outlet are arranged up and down, described anti-
The outside of cylinder 102 is answered to be provided with uptake flue 103, the pod 104 of the uptake flue 103 and 102 top of reacting cylinder body
It is connected, flue gas is introduced in reacting cylinder body 102, catalyst has been evenly arranged from top to bottom in the reacting cylinder body 102 and has shelved
Plate 105, the catalyst are shelved plate 105 and are arranged in reacting cylinder body 102 with drawer type, convenient for catalyst taking-up cleaning and more
It changes, the catalyst for being placed with and being reacted on plate 105 is shelved in each catalyst, is arranged altogether in reacting cylinder body in this implementation
There are four layers of catalyst layer, is provided with multiple spaced apart steam sootblowers in the lower section that the catalyst shelves plate 105
106, to remove the dust stratification of reacting cylinder body.
COR-2 removal of carbon monoxide catalyst, COR-1 removal of carbon monoxide catalyst etc. can be selected by wherein taking off CO catalyst.
After sintering flue gas is come out by the sintering large flue of sintering machine 10, electric precipitator is passed through under the action of main exhauster 11
The low temperature side of GGH flue gas heat-exchange unit 1 is entered after 12, the temperature of low temperature side is 150 degrees Celsius, the low temperature of GGH flue gas heat-exchange unit 1
Side outlet is connected with 2 entrance of medium temperature (320 degrees Celsius) SCR denitration device, and high temperature sintering flue gas is low GGH flue gas heat-exchange unit 1
(150 degrees Celsius rise to 320 degrees Celsius), which is passed through in the SCR denitrification apparatus 3 of medium temperature, after heating up in warm side carries out denitration process, in
Warm 3 gas approach of SCR denitration device is connected with the outlet of arrangement 6 device of blast furnace gas burner, and middling temperature DeNOx device 2 goes out
Mouth is connected with de- 3 entrance of CO device is catalyzed, and the flue gas after denitration enters the de- CO device of catalysis and carries out taking off CO processing, the catalysis
The de- outlet of CO device 3 is connected with the high temperature side entrance of GGH flue gas heat-exchange unit 1, the high temperature side outlet of GGH flue gas heat-exchange unit 1 with it is remaining
The entrance of hot steam boiler 4 is connected, and the outlet of waste heat steam boiler 4 is connected with the entrance of external air-introduced machine 5, and air-introduced machine 5 goes out
Mouth is connected with 7 entrance of desulfurizing tower, and flue gas is sent into desulfurizing tower 7 under the effect of air-introduced machine 5 and carries out desulfurization process, the desulfurizing tower 7
Outlet is connected with efficient electric defroster 8, and flue gas is discharged by chimney 9 after demisting is handled.
It is de- into Medium temperature SCR after being warming up to 320 DEG C after (150 DEG C) of flue gas after former main exhauster pass through GGH heat exchanger
Nitre device carries out removing NOx, and the flue gas after denitration enters back into the de- CO device of catalysis, since catalysis reaction is exothermic reaction, takes off CO
Temperature afterwards rises to 420 DEG C, and high-temperature flue gas exchanges heat in the high temperature side of GGH flue gas heat-exchange unit 1 with former low-temperature flue gas, changes
Exhanst gas outlet after heat is 270 DEG C, which enters boiler, and flue gas heat exchange is cooled to 160 DEG C, removes SO2 into desulfurizing tower, most
After enter back into efficient electric defroster and go out dust and droplet, make flue gas qualified discharge.
On-site demineralized water is passed through in boiler, be can produce the steam of low-temp low-pressure (0.6Mpa, 160 DEG C), is incorporated to plant area
Steam pipe network.
In starting up's stage, flue gas is heated using blast furnace gas burner, or so time about 2h can be warming up to system
Running temperature can close blast furnace gas burner at this time, restart to booting next time.
In addition to the implementation, the utility model further includes having other embodiments, all to use equivalents or equivalent
The technical solution that alternative is formed, should all fall within the protection scope of the utility model claims.
Claims (5)
1. a kind of sintering flue gas and desulfurizing and denitrifying takes off CO system, it is characterised in that: mainly include GGH flue gas heat-exchange unit, SCR is de-
Nitre device, be catalyzed de- CO device, waste heat steam boiler, air-introduced machine, blast furnace gas burner, desulfurizing tower, efficient electric defroster and
Chimney enters after electric precipitator under the action of main exhauster after sintering flue gas is come out by the sintering large flue of sintering machine
To the low temperature side of GGH flue gas heat-exchange unit, the low temperature side outlet of GGH flue gas heat-exchange unit is connected with the SCR denitration device entrance of medium temperature,
High temperature sintering flue gas is passed through in SCR denitration device after heating up in the low temperature side of GGH flue gas heat-exchange unit and carries out denitration process, SCR
The outlet of denitrification apparatus is connected with de- CO device portal is catalyzed, and the flue gas after denitration enters the de- CO device of catalysis and carries out at de- CO
Reason, the de- CO device outlet of catalysis are connected with the high temperature side entrance of GGH flue gas heat-exchange unit, the high temperature side of GGH flue gas heat-exchange unit
Outlet is connected with the entrance of waste heat steam boiler, and the outlet of waste heat steam boiler is connected with the entrance of external air-introduced machine, air-introduced machine
Outlet be connected with desulfurizing tower entrance, air-introduced machine effect under by flue gas be sent into desulfurizing tower carry out desulfurization process, the desulfurizing tower
Outlet is connected with efficient electric defroster, and flue gas is discharged by chimney after demisting is handled.
2. a kind of sintering flue gas and desulfurizing and denitrifying according to claim 1 takes off CO system, it is characterised in that: de- in SCR
Blast furnace gas burner is arranged between the exhaust pass of the low temperature side of nitre device portal flue and GGH flue gas heat-exchange unit.
3. a kind of sintering flue gas and desulfurizing and denitrifying according to claim 1 takes off CO system, it is characterised in that: described
SCR denitration device and the de- CO device of catalysis include fixed bracket and reacting cylinder body, and the reacting cylinder body is vertically installed at fixation
On bracket, smoke inlet and outlet are arranged up and down, and uptake flue, the uptake flue are provided on the outside of the reacting cylinder body
It is connected with the pod above reacting cylinder body, has been evenly arranged catalyst from top to bottom in the reacting cylinder body and has shelved plate,
Each catalyst, which is shelved, is placed with corresponding catalyst on plate.
4. a kind of sintering flue gas and desulfurizing and denitrifying according to claim 3 takes off CO system, it is characterised in that: urged described
Agent, which is shelved, is provided with multiple spaced apart steam sootblowers below plate, to remove the dust stratification of reacting cylinder body.
5. a kind of sintering flue gas and desulfurizing and denitrifying according to claim 3 takes off CO system, it is characterised in that: the catalysis
Agent is shelved plate and is arranged in reacting cylinder body with drawer type, convenient for the taking-up cleaning and replacement of catalyst.
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| CN201822036358.6U CN209348416U (en) | 2018-12-05 | 2018-12-05 | A kind of de- CO system of sintering flue gas and desulfurizing and denitrifying |
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| CN201822036358.6U CN209348416U (en) | 2018-12-05 | 2018-12-05 | A kind of de- CO system of sintering flue gas and desulfurizing and denitrifying |
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| CN112403232A (en) * | 2019-11-05 | 2021-02-26 | 中冶长天国际工程有限责任公司 | Process method and device for cooperatively purifying multiple pollutants in flue gas |
| CN112403222A (en) * | 2019-11-06 | 2021-02-26 | 中冶长天国际工程有限责任公司 | CO oxidation and denitration system and method |
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| WO2021088524A1 (en) * | 2019-11-06 | 2021-05-14 | 中冶长天国际工程有限责任公司 | System and method for denitration of flue gas by carbon monoxide |
| CN112902680A (en) * | 2021-01-29 | 2021-06-04 | 中冶华天南京工程技术有限公司 | Sintering flue gas SCR denitration energy-saving emission-reducing method and system |
| CN113198319A (en) * | 2021-05-06 | 2021-08-03 | 阳春新钢铁有限责任公司 | Method for utilizing CO in flue gas denitration of sintering flue gas |
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