CN208583168U - A kind of sintering flue gas desulfurization denitration, flue gas disappear white total system - Google Patents
A kind of sintering flue gas desulfurization denitration, flue gas disappear white total system Download PDFInfo
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Abstract
A kind of the utility model provides sintering flue gas desulfurization denitration, flue gas disappears white total system, the system includes sintering machine, wet desulfuration tower, denitrating system, convection recuperator, forced-and-induced draft fan, the first deduster, main exhauster, dehydrator, absorption type heat pump assembly and level-one cryogenic heat exchanger, the sintering dust fall pipe low-temperature zone exhanst gas outlet of sintering machine is successively connected through the first deduster, main exhauster with the smoke inlet of desulfurizing tower by pipeline, and the exhanst gas outlet of desulfurizing tower is connected through dehydrator with denitrating system by pipeline；Wet desulfuration tower is provided with serum outlet and injection point, and serum outlet is successively connected through slurry circulating pump, cooler with injection point by serum recycle pipeline；Absorption type heat pump assembly is set between convection recuperator and cooler；Level-one cryogenic heat exchanger is set on the pipeline between dehydrator and denitrating system, which is connected by pipeline with the absorption type heat pump assembly.The system can realize flue gas desulfurization and denitrification and the Bai Yu that disappears.
Description
Technical field
Disappear white total system the utility model relates to a kind of sintering flue gas desulfurization denitration, flue gas, belongs to sintering flue gas
Processing technology field.
Background technique
The publication of in June, 2017 China's Environmental Protection Department about soliciting, " mark by steel sintering, the discharge of pelletizing industrial air pollution object
It is quasi- " etc. 20 National Emission Standards modify the letter (ring does atmosphere letter [2017] 924) of single (exposure draft) opinion,
It is required sintering device handpiece nitrogen oxides in effluent discharge index from existing 300mg/Nm3It is revised as 100mg/Nm3, dioxy
Change sulphur emissions index from existing 180mg/Nm3It is revised as 50mg/Nm3。
Sintering machine is the maximum SO of steel plant2With NOx emission source, current essentially all sintering machine is all set provided with desulfurization
It applies, most of is wet process.Sintering machine NOx discharge accounts for about the 50%-60% of steel plant's discharge amount, and average emission concentration usually exists
200mg/Nm3-400mg/Nm3, also there is 150mg/Nm3-700mg/Nm3The case where, smog discharge temperature is mostly 100 DEG C -180 DEG C,
Obvious discharged nitrous oxides concentration is unable to reach the index request in modification list, it is therefore necessary to add denitration facility.
Chinese patent CN103785290A discloses a kind of agglomerates of sintered pellets flue gas desulfurization and denitrification collaboration governing system and technique,
The technical solution is: by after agglomerates of sintered pellets dedusting in flue gas be arranged selective catalytic reduction process system (SCR) into
Row denitrating flue gas and removal dioxin, flue gas enters wet desulfurization system later, carries out flue gas desulfurization and removes removing heavy metals.This is specially
Sharp technical solution is realized by following system and technique:
Agglomerates of sintered pellets flue gas desulfurization and denitrification cooperates with governing system, which includes booster fan, flue gas heat-exchange unit, burning
Device, Benitration reactor, desulfurizing tower, flue gas heat-exchange unit are rotary or pipe heat exchanger, and the agglomerates of sintered pellets flue gas after dedusting introduces
Booster fan, booster fan connect a entrance of flue gas heat-exchange unit, the outlet the b connection burner of flue gas heat-exchange unit, combustion by flue
Burner outlet by flue connect Benitration reactor, in burner) and the connection flue of Benitration reactor on be arranged denitration reduction
Agent injection apparatus；The c import of Benitration reactor outlet connection flue gas heat-exchange unit, the outlet the d connection desulfurizing tower of flue gas heat-exchange unit.
Flue gas flow guiding device, denitrating catalyst are set in the Benitration reactor.
Demister, desulfurizing tower outlet connection is arranged in the middle and upper part setting spray equipment of the desulfurizing tower, spray equipment top
Chimney, spray equipment connect circulating pump, and apparatus for preparing desulphurizing agent, desulfurizing byproduct preparation facilities is arranged in desulfurization Tower System.
Agglomerates of sintered pellets flue gas desulfurization and denitrification cooperates with Processing tecchnics, and processing step is as follows:
1) flue gas after agglomerates of sintered pellets dedusting enters a entrance of flue gas heat-exchange unit after booster fan is pressurized, and leads to
After crossing the outlet flue gas heat-exchange unit heat exchange b, flue-gas temperature increases to 150-250 DEG C；Flue gas adds in flue by the way that burner is secondary
Heat is heated to 250-350 DEG C of the denitration reaction temperature range of Benitration reactor；
2) denitrification reducing agents such as ammonium hydroxide, liquefied ammonia or urea are injected to burner and denitration by denitrification reducing agent injection apparatus
In the connection flue of reactor, denitrification reducing agent is uniformly mixed in flue gas, then by flue gas flow guiding device to enter denitration anti-
It answers in device, after denitrating catalyst, removes the nitrogen oxides and dioxin in flue gas；
3) flue gas for removing nitrogen oxides and dioxin carries out flue gas heat exchange by the c import of flue gas heat-exchange unit, and flue gas changes
The c import operation flue-gas temperature of hot device is 250-350 DEG C, and flue gas is discharged into desulfurization from the outlet the d of flue gas heat-exchange unit after heat exchange
Tower, running temperature is 80-160 DEG C at this time；
4) in desulfurizing tower, desulfurization slurry is inversely contacted by circulating pump and spray equipment with flue gas, removes titanium dioxide
Sulphur, heavy metal；
5) after flue gas removes droplet by demister after removal sulfur dioxide, heavy metal, pass through smoke stack emission.
But in the technical solution of the patent, the denitration of sintering flue gas elder generation again desulfurization need for smoke temperature to be promoted to 340 DEG C with
On, a large amount of non-renewable energy is consumed to promote smoke temperature, and at high cost, simultaneity factor is complicated.
Chinese patent CN204017646U discloses a kind of flue gas of sintering machine denitration special equipment, which includes:
Sintering machine, bellows, bag filter, booster fan, desulfurizing tower, dehumidifying purifying column, SCR reactor, blower, chimney, the burning
Knot machine sequential connection bellows, bag filter, booster fan, desulfurizing tower, dehumidifying purifying column, SCR reactor, blower, chimney, institute
It states and is connected with electric control valve between bellows and bag filter, the fan outlet is connect with desulfurizing tower air intake, desulfurizing tower
Air intake lower sides are provided with pH detection controller, and pH detects controller and connected by control cable and desulfurization pump, desulfurizing tower
Air intake lower part connects aeration displacement reaction tank by pipeline, and aeration displacement reaction tank connects sedimentation basin, aeration displacement reaction tank
Side is provided with roots blower, and the other side is provided with calcium hydroxide feed bin, and calcium hydroxide feed bin connects discharger, discharger connection
Electron helical claims, and electron helical claims to connect frequency conversion rotary feeder, frequency conversion rotary feeder connection aeration displacement reaction tank, aeration
Displacement reaction tank pool side is provided with aeration displacement reaction tank pH detection controller, and aeration displacement reaction tank pH detection controller passes through
Control cable is connect with frequency conversion rotary feeder, and sedimentation basin connects conditioning tank, and sedimentation basin lower part is provided with the outer discharge pipe of waste liquid, adjusts
The section pond other side is provided with sodium hydroxide storage tank, and conditioning tank pool side is provided with conditioning tank pH detection controller, conditioning tank pH detection
Controller is connect by controlling cable with electric charging valve, and desulfurizing tower air intake top is provided with nozzle, and nozzle top is provided with
Demister, demister top are provided with exhanst gas outlet, and exhanst gas outlet connects dehumidifying purifying column, are provided in the purifying column that dehumidifies damp proof
Air filter, dehumidifying purify tower bottom and are provided with the outer discharge pipe of dehumidifying purifying column waste liquid, and nozzle passes through desulfurization inner wall of tower and takes off
The hose adapter of sulphur tower outer wall connects, and hose adapter is connect with spray tube, and spray tube is fixed by the bracket on desulfurizing tower outer wall, spray
Pipe is connect with inlet tube, and inlet tube and desulfurization pump connect, desulfurization pump connection conditioning tank, is equipped with catalysis among the SCR reactor
Oxidant layer, SCR reactor top are connect with ammonia/air mixer, and ammonia/air mixer connects with dilution ammonia blower all the way
It connects, another way is connect with ammonia dashpot, and ammonia dashpot is connect with ammonia evaporator.
But in the technical solution of the patent, which comes out from desulfurizing tower, does not have before entering SCR reactor
There is promotion flue-gas temperature, SCR denitration reaction is difficult to play its effect at low temperature, and denitration effect is poor, it is difficult to realize reaching for flue gas
Mark discharge.
Therefore it provides a kind of sintering flue gas desulfurization denitration, flue gas disappear, white total system and technique have become ability
The technical issues of domain urgent need to resolve.
Utility model content
In order to solve the above shortcomings and deficiencies, it is de- that the purpose of this utility model is to provide a kind of sintering flue gas desulfurizations
Nitre, flue gas disappear white total system.The system provided by the utility model can be in existing sintering smoke wet method sulphur
On the basis of process route, denitrating flue gas is further realized, flue gas disappears Bai Yu, and reduces the mesh of purification environmental-protection operating cost
's.
In order to achieve the above object, a kind of the utility model provides sintering flue gas desulfurization denitration, flue gas disappears white integrated treatment system
System comprising sintering machine, wet desulfuration tower, denitrating system and sinter cooler, wherein the sintering flue gas desulfurization denitration, cigarette
The gas white total system that disappears further includes convection recuperator and forced-and-induced draft fan, the sintering dust fall pipe high temperature section flue gas of the sintering machine
Outlet is successively connected via the sinter bed of convection recuperator and forced-and-induced draft fan and sintering machine top by pipeline；
The sintering flue gas desulfurization denitration, flue gas disappear white total system further include the first deduster, main exhauster and
Dehydrator；
The sintering dust fall pipe low-temperature zone exhanst gas outlet of the sintering machine is by pipeline successively via the first deduster, main exhausting
Machine is connected with the smoke inlet of wet desulfuration tower, and the exhanst gas outlet of the wet desulfuration tower is by pipeline via dehydrator and denitration system
System is connected；
The wet desulfuration tower is provided with serum outlet and injection point, which passes through serum recycle pipeline successively
It is connected via slurry circulating pump, cooler with the injection point；
The sintering flue gas desulfurization denitration, the flue gas white total system that disappears are additionally provided with absorption type heat pump assembly, low temperature
Water-circulating pump, level-one cryogenic heat exchanger, the absorption type heat pump assembly is set between convection recuperator and cooler, and this is low
Warm water circulation pump is on the pipeline between cooler and absorption type heat pump assembly；
The level-one cryogenic heat exchanger is set on the pipeline between dehydrator and denitrating system, the level-one cryogenic heat exchanger
It is connected by pipeline with the absorption type heat pump assembly.
Specific embodiment according to the present utility model, the sintering flue gas desulfurization denitration, flue gas disappear white integrated treatment system
System is additionally provided with medium temperature water-circulating pump and water-cooling tower or air cooling tower, and the water-cooling tower or air cooling tower and medium temperature water-circulating pump are set gradually
On pipeline between level-one cryogenic heat exchanger and absorption type heat pump assembly.
Wherein, absorption type heat pump assembly, convection recuperator used in the utility model, cooler and level-one cryogenic heat exchanger etc.
It is the conventional equipment that this field uses, and how is attached use to it as known to those skilled in the art.
In one specific embodiment of the utility model, when the thermogenetic height of high temperature for extracting circulating flue gas using step a
When warm water, the sintering flue gas desulfurization denitration, flue gas white total system that disappears also need to be arranged hot water circulating pump to heat
The high-temperature-hot-water is conveyed, the hot water circulating pump is on the pipeline between the absorption type heat pump assembly and convection recuperator.
Specific embodiment according to the present utility model, the sintering flue gas desulfurization denitration, flue gas disappear white integrated treatment system
System further includes the second deduster, which is located at the sintering dust fall pipe high temperature section exhanst gas outlet and heat convection of sintering machine
On pipeline on pipeline between device, or between the convection recuperator and forced-and-induced draft fan.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In system, the denitrating system includes secondary heat exchanger, flue gas three-level heat riser and denitrification apparatus, the wet desulfuration tower
Exhanst gas outlet by pipeline successively via the smoke inlet phase of secondary heat exchanger, flue gas three-level heat riser and denitrification apparatus
Even, the exhanst gas outlet of the denitrification apparatus is connected by pipeline with secondary heat exchanger.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In system, the denitrating system further includes chimney, and the exhanst gas outlet of the secondary heat exchanger is connected by pipeline with the chimney.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In system, the exhanst gas outlet of the secondary heat exchanger is connected via the first booster fan with the chimney by pipeline.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In system, the denitrating system further includes hot fume generating device, which passes through pipeline and the flue gas three
Grade heat riser is connected.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In system, the denitrification apparatus is SCR denitration reaction device or low temperature SCR denitration reaction unit.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In system, denitrification process device therefor, such as SCR denitration reaction device or low-temperature SCR (LSCR) denitration reaction device, secondary heat exchange
Device, flue gas three-level heat riser etc. are the conventional equipment that this field uses,
Wherein, secondary heat exchanger is the low-temperature flue gas for flowing out the high-temperature flue gas and outflow level-one cryogenic heat exchanger of denitrification apparatus
The device to exchange heat.
It (such as can be to fill from hot fume that flue gas three-level heat riser, which is by the high-temperature flue gas that temperature is 1000 DEG C or so,
The high-temperature flue gas set) in a manner of being directly mixed in low-temperature flue gas or high-temperature medium (such as steam, flue gas, fused salt, conduction oil work
Matter) indirect heat exchange heating mode improve flue-gas temperature to denitrating catalyst efficient operation temperature range device；It can be with
High-temperature flue gas is directly mixed in low-temperature flue gas by injection apparatus, higher temperature carrier is also can use, passes through indirect heat exchange
Mode, by the heat transfer of higher temperature carrier to low-temperature flue gas, to promote the temperature of low-temperature flue gas to the efficient work of denitrating catalyst
Make temperature range.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In system, desulfurization booster fan is additionally provided on the pipeline between the main exhauster and the smoke inlet of wet desulfuration tower.
When system described in the utility model is only arranged main exhauster and is not provided with desulfurization booster fan, main exhauster
Pressure needed for wind pressure needs fully consider sintering original production system and desulphurization system.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In system, the low temperature waste gas outlet of the sinter cooler is by pipeline via the sinter bed of the second booster fan and sintering machine
Top is connected.At this point, can be using the low temperature waste gas of sinter cooler as a part of sintering combustion wind.
Specific embodiment according to the present utility model, the sintering flue gas desulfurization denitration, flue gas disappear white total system
Dehydrator used includes but is not limited to wet-esp equipment, acoustic agglomeration oil (gas) filling device, mechanical dehydration device equipment etc., both can be with
Realize ultra-clean dedusting again and can remove the droplet in flue gas.
System described in the utility model can be adapted for a variety of different techniques and be sintered flue gas desulfurization and denitrification, flue gas
Disappear white integrated treatment, and in order to further be illustrated to the system of the utility model, the utility model is additionally provided using this reality
Desulphurization denitration is carried out to sintering flue gas with novel system, flue gas disappears the technique of white integrated treatment, the technique includes following step
It is rapid:
A, it after sintering high temperature flue gas being carried out heat exchange processing, backs into above the charge level of sintering machine, to participate in being sintered
The burning of sintered ore materials on machine trolley；
B, low-temperature sintering wet flue gas is successively dusted, wet desulphurization is handled and removing liquid water process；
Using high-temperature-hot-water obtained by sintering high temperature flue gas heat exchange process in step a or steam as the drive of absorption type heat pump assembly
Dynamic heat source, the absorption type heat pump assembly generate water at low temperature, and the loop slurry in the water at low temperature and wet desulphurization treatment process carries out
Heat exchange after water at low temperature extracts the Low Temperature Thermal of loop slurry, is back to absorption type heat pump assembly, forms water at low temperature circulation；
Middle warm water is obtained after the absorber heat exchanging that recirculated water in the absorption type heat pump assembly passes through absorption type heat pump assembly,
Again using treated the flue gas of warm water heating removing liquid water in this, the suction of absorption type heat pump assembly is returned in this after warm water cooling
Receive device heat exchange, Warm water circulation in formation；
C, denitration process is carried out to sintering flue gas obtained by step b.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In technique, step a further includes the operation being dusted before heat exchange processing to the sintering high temperature flue gas.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In technique, heat exchange treated sintering high temperature flue-gas temperature is 120-150 DEG C in step a.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
It in the step a of technique, after sintering high temperature flue gas is carried out heat exchange processing, backs into above the charge level of sintering machine, to participate in
The burning of sintered ore materials on sintering pallet；Interior circulation can be formed at this time, realizes recycling for partial fume, reduce discharge cigarette
Tolerance, while can also be improved the initial wind-warm syndrome for participating in sinter burning, reduce sinter primary energy consumption amount；In addition, by
The sintering flue gas total amount for needing desulphurization denitration is decreased in using to recycle in sintering flue gas part, and then directly reduces sintering
The cost of gas cleaning.
In addition, because in the flue gas of circulation oxygen content it is relatively low, sinter cooler low temperature waste gas (ingredient can be introduced in implementation process
For air) supplement as sintering combustion wind；It is embodied in the sintering flue gas desulfurization denitration, flue gas disappears in white total system
The low temperature waste gas outlet of the as described sinter cooler is by pipeline via the sintering combustion wind of the second booster fan and sintering machine
Entrance is connected.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In the step b of technique, water at low temperature exchanges heat with the loop slurry in wet desulphurization treatment process, the loop slurry after heat exchange
It is 5-10 DEG C cooling.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In technique, using the middle warm water heating removing liquid water treated flue gas, so that the micro- overheat of flue gas.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In technique, step b are as follows: low-temperature sintering wet flue gas is successively dusted in the first deduster, is carried out in wet desulfuration tower
Wet desulphurization handles and carries out in dehydrator removing liquid water process；
By high-temperature-hot-water (about 130 DEG C) or steam obtained by sintering high temperature flue gas heat exchange process in step a, (0.3-0.4MPa is low
Press saturated vapor) driving heat source as absorption type heat pump assembly, which generates water at low temperature (about 20 DEG C), this
Water at low temperature exchanges heat with the loop slurry in wet desulphurization treatment process, and temperature rise is about 10 DEG C, and water at low temperature extracts recycle slurry
After the Low Temperature Thermal of liquid, it is back to absorption type heat pump assembly, forms water at low temperature circulation；Recycle slurry in the wet desulphurization treatment process
Liquid also reduces the temperature of flue gas obtained by wet desulphurization treatment process while cooled, and the corresponding saturation of the flue gas is containing wet
Amount also decreases.
Recirculated water (temperature is lower than 33 DEG C) in the absorption type heat pump assembly is changed by the absorber of absorption type heat pump assembly
It is obtained after heat middle warm water (about 50 DEG C), then heat in level-one cryogenic heat exchanger using warm water in this and to remove liquid water treated
Flue gas returns to the absorber of absorption type heat pump assembly so that the micro- overheat of flue gas after warm water cools down in level-one cryogenic heat exchanger in this
It exchanges heat, Warm water circulation in formation；The operation can not only make the micro- overheat of flue gas, but also saved heating low-temperature flue gas and consumed extraneous primary
The dosage of the energy.
In one specific embodiment of the utility model, removing liquid is heated in level-one cryogenic heat exchanger using warm water in this
Flue gas after state water process makes the micro- overheat of flue gas, and warm water is passed to air-cooled again after cooling down in level-one cryogenic heat exchanger in this
Tower or water-cooling tower further cool down, and further the middle warm water after cooling returns to the absorber heat exchanging of absorption type heat pump assembly, are formed
Middle Warm water circulation.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In technique, the step c is comprising the following specific steps heat up to sintering flue gas obtained by step b, then the sintering after will heat up
Flue gas carries out denitration process, and gained high temperature purification flue gas is emitted into atmosphere after heat exchange is cooling after denitration process.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In technique, gained high temperature purification flue gas is emitted into atmosphere after heat exchange is cooling after denitration process described in step c, comprising: by denitration
Gained high temperature purification flue gas exchanges heat with sintering flue gas obtained by step b after processing, so that the sintering flue gas tentatively heats up, then will
High temperature purification flue gas emission after cooling is to atmosphere.The utility model can utilize the suction of sintering high temperature fume afterheat driving as a result,
Receipts formula heat pump unit realizes the dehumidification of flue gas, and is realized and taken off using denitrating system (low energy consumption sintering flue gas self-heating denitrating system)
While nitre function, which can also make the low-temperature flue gas after dehumidification heat up, therefore the driving of sintering high temperature fume afterheat
Absorption type heat pump assembly is followed by that low energy consumption sintering flue gas self-heating denitrating system can realize denitrating flue gas, disappear white purpose.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In technique, the denitration process is that low temperature SCR denitration is handled or SCR denitration is handled.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In technique, when denitration process is that SCR denitration is handled, the temperature of the sintering flue gas after the preliminary heating is 200-220 DEG C；Institute
The temperature of sintering flue gas after stating heating is 260 DEG C or so；
When the denitration process is LSCR denitration process, the temperature of the sintering flue gas after the heating is 180-190 DEG C.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
It is described to be cooled to the temperature of gained purifying smoke after denitration process being reduced to 65 DEG C or more in technique.When the discharge temperature of flue gas
Degree can reach flue gas and disappear white effect at 65 DEG C or more.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In technique, step c specifically includes the following steps:
Sintering flue gas obtained by step b successively passes through secondary heat exchanger (preliminary heating), flue gas three-level heat riser, by smoke temperature
260 DEG C or so are increased to, the flue gas after heating enters SCR denitration reaction device, (if it is LSCR denitration reaction device, cigarette
Temperature degree is increased to 180-190 DEG C or so).The heat that the high-temperature flue gas of denitrification apparatus is flowed out after denitration is changed by flue gas from heating
Hot device is passed into the low-temperature flue gas before denitration, so that low-temperature flue gas depends on itself flue gas Re Laijia in the temperature-rise period overwhelming majority
Heat, the high-temperature flue gas after heat exchange arrange atmosphere.
Specific embodiment according to the present utility model disappears white integrated treatment in the sintering flue gas desulfurization denitration, flue gas
In technique, the flue gas of output enters dust fall pipe in sintering machine sintering process.Be divided into two parts in dust fall inner tube smoke, a part for by
The low-temperature sintering wet flue gas at nearly sintering device handpiece position, a part is close to the sintering high temperature flue gas of tail.High-temperature flue gas is about
The 20%-30% of total exhaust gas volumn." high temperature " of the sintering high temperature flue gas is for the temperature of low-temperature sintering wet flue gas
, in general, the temperature of sintering high temperature flue gas is about 300-400 DEG C, the temperature of low-temperature sintering wet flue gas is about 90-110 DEG C.
The sintering flue gas desulfurization denitration provided by the utility model, flue gas disappear white total system and technique can be existing
On the basis of the process route of some sintering smoke wet method sulphurs, denitrating flue gas is further realized, flue gas disappears Bai Yu, and reduces
The purpose of purification environmental-protection operating cost.Specifically, the utility model uses the method recycled in flue gas first, by amount of flue gas emission
Reduce about 20%-30%, while being extracted circulating flue gas thermal drivers absorption type heat pump assembly, output water at low temperature, the water at low temperature with
The loop slurry of wet desulphurization exchanges heat, to extract the Low Temperature Thermal of the loop slurry；Warm water in absorption type heat pump assembly while output,
Middle warm water heating removing liquid water treated flue gas, that is, enter level-one cryogenic heat exchanger, make the micro- overheat of flue gas, then by other heat
Flue gas or the further heater riser smoke temperature of waste heat source.The utility model both reduced amount of flue gas emission from sintering production source, thus
Substantially reduce the processing cost of flue gas；Simultaneously using flue gas itself waste heat driving absorption heat pump output water at low temperature with cooling
The mode of loop slurry realizes desulfurization fume cool-down dehumidification indirectly；The middle warm water generated by absorption heat pump repeats itself
Further heating removing liquid water treated low-temperature flue gas makes micro- and crosses hot fume, visually reaches certain and disappear
White effect；Gained flue gas is further carried out heating denitration process, and final exhaust temperature is at 65 DEG C or more, thus ultimate guarantee
The ultra-clean discharge of flue gas and the white effect that disappears.
Detailed description of the invention
Fig. 1 is that the disappear structure of white total system of sintering flue gas desulfurization denitration provided by the utility model, flue gas is shown
It is intended to.
Main Reference label declaration:
1, sintering machine；2, it is sintered dust fall pipe low-temperature zone；3, it is sintered dust fall pipe high temperature section；4, the first deduster；5, main exhausting
Machine；6, desulfurization booster fan；7, wet desulfuration tower；8, dehydrator；9, secondary heat exchanger；10, three-level heat riser；11, denitration
Device；12, the first booster fan；13, hot fume generating device；14, absorption type heat pump assembly；15, convection recuperator；16, cold
But device；17, level-one cryogenic heat exchanger；18, hot water circulating pump；19, low temperature water-circulating pump；20, medium temperature water-circulating pump；21, slurries
Circulating pump；22, water-cooling tower or air cooling tower；23, the second deduster；24, forced-and-induced draft fan；25, cooler；26, the second booster fan；
27, chimney.
Specific embodiment
The implementation process of the utility model and having for generation is described in detail below by way of specific embodiment and Figure of description
Beneficial effect, it is intended to help reader to more fully understand the essence and feature of the utility model, not as to this case enforceable range
Restriction.
Embodiment 1
Present embodiments provide a kind of sintering flue gas desulfurization denitration, flue gas disappears white total system, the structure of the system
Schematic diagram is as shown in Figure 1, from figure 1 it appears that the system comprises sintering machine 1, wet desulfuration tower 7, denitrating system and burnings
Tie cooler 25, wherein the sintering flue gas desulfurization denitration, flue gas disappear white total system further include the second deduster 23,
3 exhanst gas outlet of sintering dust fall pipe high temperature section of convection recuperator 15 and forced-and-induced draft fan 24, the sintering machine 1 is successively passed through by pipeline
By being connected above the second deduster 23, convection recuperator 15 and forced-and-induced draft fan 24 and the sinter bed of sintering machine 1；
The sintering flue gas desulfurization denitration, flue gas disappear white total system further include the first deduster 4, main exhauster 5,
Desulfurization booster fan 6 and dehydrator 8；
2 exhanst gas outlet of sintering dust fall pipe low-temperature zone of the sintering machine 1 is by pipeline successively via the first deduster 4, master
Exhaust fan 5, desulfurization booster fan 6 are connected with the smoke inlet of wet desulfuration tower 7, and the exhanst gas outlet of the wet desulfuration tower 7 passes through
Pipeline is connected via dehydrator 8 with denitrating system；
The wet desulfuration tower 7 is provided with serum outlet and injection point, the serum outlet by serum recycle pipeline according to
It is secondary to be connected via slurry circulating pump 21, cooler 16 with the injection point；
The sintering flue gas desulfurization denitration, the flue gas white total system that disappears are additionally provided with absorption type heat pump assembly 14, low
Warm water circulation pump 19, level-one cryogenic heat exchanger 17, medium temperature water-circulating pump 20 and water-cooling tower or air cooling tower 22, the absorption heat pump
Unit 14 is set between convection recuperator 15 and cooler 16, and the low temperature water-circulating pump 19 be located at cooler 16 with it is absorption
On pipeline between heat pump unit 14；
The level-one cryogenic heat exchanger 17 is set on the pipeline between dehydrator 8 and denitrating system, which changes
Hot device 17 is connected by pipeline with the absorption type heat pump assembly 14, and the water-cooling tower or air cooling tower 22 and medium temperature water-circulating pump
20 are set on the pipeline between level-one cryogenic heat exchanger 17 and absorption type heat pump assembly 14；
The denitrating system include secondary heat exchanger 9, flue gas three-level heat riser 10, denitrification apparatus 11, chimney 27 and
The exhanst gas outlet of hot fume generating device 13, the wet desulfuration tower 7 is successively changed via dehydrator 8, a grade low-temp by pipeline
Hot device 17, secondary heat exchanger 9, flue gas three-level heat riser 10 are connected with the smoke inlet of denitrification apparatus 11, the denitrification apparatus 11
Exhanst gas outlet be connected with secondary heat exchanger 9 by pipeline；
The exhanst gas outlet of the secondary heat exchanger 9 is connected via the first booster fan 12 with the chimney 27 by pipeline；
The hot fume generating device 13 is connected by pipeline with the flue gas three-level heat riser 10；
The low temperature waste gas outlet of the sinter cooler 25 is by pipeline via the burning of the second booster fan 26 and sintering machine 1
It is connected above ramming material layer；
The denitrification apparatus 11 can be SCR denitration reaction device or low temperature SCR denitration reaction unit；
In addition, the system also needs to be arranged when the high temperature for extracting circulating flue gas using step a thermogenetic high-temperature-hot-water
Hot water circulating pump 18 to the heated transportation high-temperature-hot-water, the hot water circulating pump 18 be located at the absorption type heat pump assembly 14 with it is right
It flows on the pipeline between heat exchanger 15.
Embodiment 2
Present embodiments provide a kind of sintering flue gas desulfurization denitration, flue gas disappears white comprehensive processing technique, wherein the technique is
Disappear what white total system was realized using sintering flue gas desulfurization denitration, flue gas provided by embodiment 1, the technique includes
Step in detail below:
The flue gas of output enters dust fall pipe in sintering machine sintering process.It is divided into two parts in dust fall inner tube smoke, a part is
Low-temperature sintering wet flue gas close to sintering device handpiece position, a part is close to sintering high temperature flue gas；
A, the sintering high temperature flue gas is dusted in the second deduster, then gained flue gas after dedusting is changed in convection current
It exchanges heat in hot device, heat exchange treated sintering high temperature flue-gas temperature is 120-150 DEG C, then by forced-and-induced draft fan by the heat exchange
Flue gas afterwards sends back to before sintering machine sintering end point on charge level, to participate in the burning of sintered ore materials on sintering pallet；
Because oxygen content is relatively low in the flue gas of circulation, sinter cooler low temperature waste gas can be introduced in implementation process, and (ingredient is sky
Gas) supplement as sintering combustion wind.
B, low-temperature sintering wet flue gas is successively dusted in the first deduster, progress wet process takes off in wet desulfuration tower
Sulphuring treatment and carried out in dehydrator removing liquid water process；
By high-temperature-hot-water (about 130 DEG C) or steam obtained by sintering high temperature flue gas heat exchange process in step a, (0.3-0.4MPa is low
Press saturated vapor) driving heat source as absorption type heat pump assembly, which generates water at low temperature (about 20 DEG C), this
Water at low temperature exchanges heat with the loop slurry in wet desulphurization treatment process, and temperature rise is about 10 DEG C, and water at low temperature extracts recycle slurry
After the Low Temperature Thermal of liquid, it is back to absorption type heat pump assembly, forms water at low temperature circulation；Recycle slurry in the wet desulphurization treatment process
Liquid also reduces the temperature (about 40 DEG C) of flue gas obtained by wet desulphurization treatment process while cooled, flow out slurries at this time
The corresponding saturation of 55 DEG C of flue gases that flue gas corresponding 40 DEG C of saturation water capacity flows out when being not cooled by lower than loop slurry is containing wet
Amount, to realize the dehumidification of flue gas.
Recirculated water (temperature is lower than 33 DEG C) in the absorption type heat pump assembly is changed by the absorber of absorption type heat pump assembly
It is obtained after heat middle warm water (about 50 DEG C), then heat in level-one cryogenic heat exchanger using warm water in this and to remove liquid water treated
Flue gas is so that the micro- overheat (making 5 DEG C of flue gas temperature rise or so) of flue gas, again by it after warm water cools down in level-one cryogenic heat exchanger in this
It send to air cooling tower or water-cooling tower and further cools down, the absorber that further the middle warm water after cooling returns to absorption type heat pump assembly changes
Heat, Warm water circulation in formation；The operation can not only make the micro- overheat of flue gas, but also saved heating low-temperature flue gas and consumed extraneous primary energy
The dosage in source.
C, sintering flue gas obtained by step b successively passes through secondary heat exchanger (preliminary heating, be warming up to 200-220 DEG C), flue gas
Smoke temperature is increased to 260 DEG C or so by three-level heat riser, and the flue gas after heating enters SCR denitration reaction device.It is flowed out after denitration
The heat of the high-temperature flue gas of denitrification apparatus is passed to from temperature rise heat exchanger (secondary heat exchanger) into low before denitration by flue gas
Warm flue gas, so that low-temperature flue gas is heated in the temperature-rise period overwhelming majority by itself flue gas heat, high-temperature flue gas heat exchange is cooled to 65
DEG C or more heel row atmosphere.
The above, only specific embodiment of the utility model cannot limit the range that utility model is implemented, institute with it
With the displacement of its equivalent assemblies, or according to equivalent variations made by the utility model patent protection scope and modification, should all still fall within
The scope that this patent is covered.
Claims (10)
- The white total system 1. a kind of sintering flue gas desulfurization denitration, flue gas disappear comprising sintering machine (1), wet desulfuration tower (7), denitrating system and sinter cooler (25), which is characterized in that the sintering flue gas desulfurization denitration, flue gas disappear white integrated treatment System further includes convection recuperator (15) and forced-and-induced draft fan (24), sintering dust fall pipe high temperature section (3) flue gas of the sintering machine (1) Outlet is by pipeline successively via convection recuperator (15) and forced-and-induced draft fan (24) and phase above the sinter bed of sintering machine (1) Even；The sintering flue gas desulfurization denitration, the flue gas white total system that disappears further include the first deduster (4), main exhauster (5) And dehydrator (8)；Sintering dust fall pipe low-temperature zone (2) exhanst gas outlet of the sintering machine (1) by pipeline successively via the first deduster (4), Main exhauster (5) is connected with the smoke inlet of wet desulfuration tower (7), and the exhanst gas outlet of the wet desulfuration tower (7) is passed through by pipeline It is connected by dehydrator (8) with denitrating system；The wet desulfuration tower (7) is provided with serum outlet and injection point, which passes through serum recycle pipeline successively It is connected via slurry circulating pump (21), cooler (16) with the injection point；The sintering flue gas desulfurization denitration, the flue gas white total system that disappears are additionally provided with absorption type heat pump assembly (14), low temperature Water-circulating pump (19), level-one cryogenic heat exchanger (17), the absorption type heat pump assembly (14) be set to convection recuperator (15) and Between cooler (16), and the low temperature water-circulating pump (19) is located at the pipe between cooler (16) and absorption type heat pump assembly (14) On the road；The level-one cryogenic heat exchanger (17) is set on the pipeline between dehydrator (8) and denitrating system, which changes Hot device (17) is connected by pipeline with the absorption type heat pump assembly (14).
- 2. system according to claim 1, which is characterized in that the denitrating system includes secondary heat exchanger (9), flue gas three Grade heat riser (10) and denitrification apparatus (11), the exhanst gas outlet of the wet desulfuration tower (7) is by pipeline successively via two Grade heat exchanger (9), flue gas three-level heat riser (10) are connected with the smoke inlet of denitrification apparatus (11), the denitrification apparatus (11) Exhanst gas outlet is connected by pipeline with secondary heat exchanger (9).
- 3. system according to claim 2, which is characterized in that the denitrating system further includes chimney (27), the second level The exhanst gas outlet of heat exchanger (9) is connected by pipeline with the chimney (27).
- 4. system according to claim 2 or 3, which is characterized in that the exhanst gas outlet of the secondary heat exchanger (9) passes through pipe Road is connected via the first booster fan (12) with the chimney (27).
- 5. system according to claim 2 or 3, which is characterized in that the denitrating system further includes hot fume generating device (13), which is connected by pipeline with the flue gas three-level heat riser (10).
- 6. system according to claim 2 or 3, which is characterized in that the denitrification apparatus (11) is SCR denitration reaction device Or low temperature SCR denitration reaction unit.
- 7. system according to claim 1 or 2, which is characterized in that the main exhauster (5) and wet desulfuration tower (7) Desulfurization booster fan (6) are additionally provided on pipeline between smoke inlet.
- 8. system according to claim 1 or 2, which is characterized in that the low temperature waste gas of the sinter cooler (25) exports It is connected by pipeline via the sinter bed of the second booster fan (26) and sintering machine (1) top.
- 9. system according to claim 1 or 2, which is characterized in that the sintering flue gas desulfurization denitration, flue gas disappear white synthesis Processing system further includes the second deduster (23), which is located at the sintering dust fall pipe high temperature section of sintering machine (1) (3) on the pipeline between exhanst gas outlet and convection recuperator (15), or it is located at the convection recuperator (15) and forced-and-induced draft fan (24) on the pipeline between.
- 10. system according to claim 1 or 2, which is characterized in that the sintering flue gas desulfurization denitration, flue gas disappear white comprehensive Close processing system and be additionally provided with medium temperature water-circulating pump (20) and water-cooling tower or air cooling tower (22), the water-cooling tower or air cooling tower (22) and Medium temperature water-circulating pump (20) is set in turn on the pipeline between level-one cryogenic heat exchanger (17) and absorption type heat pump assembly (14).
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| CN108704463A (en) * | 2018-07-25 | 2018-10-26 | 北京京诚科林环保科技有限公司 | A kind of sintering flue gas desulfurization denitration, flue gas disappear white total system and technique |
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| CN108704463A (en) * | 2018-07-25 | 2018-10-26 | 北京京诚科林环保科技有限公司 | A kind of sintering flue gas desulfurization denitration, flue gas disappear white total system and technique |
| CN108704463B (en) * | 2018-07-25 | 2024-03-08 | 北京京诚科林环保科技有限公司 | Comprehensive treatment system and process for desulfurization and denitrification of sintering flue gas and whitening of flue gas |
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