CN104174287A - Partial flue gas denitrification system and method for sintering machine - Google Patents
Partial flue gas denitrification system and method for sintering machine Download PDFInfo
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- CN104174287A CN104174287A CN201410382738.9A CN201410382738A CN104174287A CN 104174287 A CN104174287 A CN 104174287A CN 201410382738 A CN201410382738 A CN 201410382738A CN 104174287 A CN104174287 A CN 104174287A
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Abstract
The invention provides a partial flue gas denitrification system and method for a sintering machine. The system comprises a dust remover, a sintering main exhaust fan, a desulfurization device, a desulfurization induced draft fan, a heating device, a denitrification device, a denitrification induced draft fan, a non-denitrification flue and a chimney, wherein a flue gas outlet of a machine head of the sintering machine is sequentially connected with the dust remover, the sintering main exhaust fan, the desulfurization device and the desulfurization induced draft fan and is respectively connected with the non-denitrification flue and the heating device through a pipeline and a tee joint; and the heating device is sequentially connected with the denitrification device and the denitrification induced draft fan and is connected with the non-denitrification flue together to the chimney through the pipeline and tee joint. The method comprises the following steps: allowing sintered flue gas discharged from the flue gas outlet of the machine head of the sintering machine to enter the desulfurization device under the actions of the sintering main exhaust fan and the desulfurization induced draft fan, allowing one part of the desulfurized flue gas to enter the non-denitrification flue, allowing the other part of the flue gas to enter the denitrification device by virtue of the heating device under the action of the denitrification induced draft fan, mixing the other part of the flue gas with the desulfurized flue gas which passes through the non-denitrification flue, and discharging the flue gas through the chimney.
Description
Technical field
The present invention relates to a kind of sintering machine partial fume denitrating system and method, belong to smelting iron and steel technical field.
Background technology
Along with the development of national economy and the raising day by day of living standards of the people, environmental problem obtains people and more and more payes attention to, and conduct and the closely-related pollutant of air quality, nitrogen oxide is subject to paying close attention to of country always.Steel enterprise sintering machine is as emphasis NOx emission source, its denitration also receives increasing concern, " key area prevention and control of air pollution " 12 " planning " explicitly calls for and carries out nitrogen oxides pollution control comprehensively, actively develop sintering device flue gas denitration demonstration, and " the prevention and control of air pollution action plan " that issue in September, 2013 requires to accelerate key industry denitration transformation especially.
Sintering machine is the NOx emission source of steel plant's maximum, accounts for the 50%-60% (not containing power plant for self-supply) of steel plant's nitrogen oxide emission, and average emission concentration is mostly at 200-400mg/Nm
3, also there is the situation that minority concentration is higher, part is difficult to meet GB28662-2012 " steel sintering, pelletizing industrial air pollution thing discharge standard ".The NO that GB28662 requires at present
xconcentration of emission is 300mg/Nm
3, certainly along with environmental requirement is more and more higher, also may further reduce concentration of emission.
The SNCR method (SNCR) using when ripe denitration technology comprises 800 DEG C-1000 DEG C at present, the middle temperature selective catalytic reduction method (SCR) of 280 DEG C of-420 DEG C of uses, and 150 DEG C-200 DEG C and above temperature are used and require the low-temperature SCR of low sulfur dioxide concentration, but because of sinter fume low temperature and containing characteristics such as sulfur dioxide, be difficult to the above-mentioned technology of directly transplanting.Sinter fume temperature is conventionally below 150 DEG C, and sulfur dioxide concentration is many at 800mg/Nm
3-1500mg/Nm
3, after wet desulphurization, how cigarette temperature is at 50 DEG C-60 DEG C, and after dry desulfurization, cigarette temperature can reach 70 DEG C-90 DEG C, but all cannot meet SCR reaction condition before and after desulfurization.
CN101810999A discloses a kind of partial fume denitrating method, and concrete steps are: collect the also first dedusting of flue gas in the high nitrous oxides concentration of sintering machine region, rear denitration; Collect low concentration region flue gas dedusting; After above-mentioned two parts flue gas is mixed, carry out desulfurization, then enter atmosphere.This technology belongs to selective denitrification, it carries out denitration before desulfurization, be that denitration sulfur dioxide in flue gas concentration is higher, mean and only can adopt Medium temperature SCR (280 DEG C-420 DEG C), and the lucky temperature of this part flue gas is lower, so need to significantly heat up to flue gas, can offset the effect that adopts the Energy Intensity Reduction that brings of partial fume denitrating; Sulfur dioxide in flue gas concentration is higher in addition, identical SO in SCR reaction
2/ SO
3in conversion ratio situation, newly-generated SO
3measure greatlyr, and follow-up desulfurization is while adopting the most frequently used wet desulphurization, to SO
3removal efficiency is lower, can cause new pollution; Because realize partial fume denitrating by the transformation of front end smoke box, denitrating system cannot cut out maintenance in the situation that not affecting sintering machine on the one hand, on the other hand also cannot be by increasing the discharge standard that the measure replies such as treating capacity in the future may be stricter.And the enforcement of this system and method need to transform largely to existing sinter fume system and flue gas desulphurization system thereof and technique, consumes resources and expense.
CN103463976A discloses a kind of flue gas denitrification system and method, and the concrete steps of the method are: after main exhauster of sintering, all flue gas, by after the heat-exchange device that once heats up, secondary temperature elevation heater, enters SCR denitrification apparatus and carries out denitration.Wherein, secondary temperature elevation heater uses pipe burner, and fuel uses coke-stove gas, blast furnace gas or natural gas etc.There is similar shortcoming in this technology and above-mentioned technology, denitration sulfur dioxide in flue gas concentration is higher, mean and only can adopt Medium temperature SCR (280 DEG C-420 DEG C), so need to significantly heat up to flue gas, whole exhaust gas volumns are significantly heated up and will expend aniseed fuel or the energy; Sulfur dioxide in flue gas concentration is higher in addition, identical SO in SCR reaction
2/ SO
3in conversion ratio situation, newly-generated SO
3measure greatlyr, can cause new pollution.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of sintering machine partial fume denitrating system and method.Denitrating system of the present invention and method can realize the nitrogen oxide qualified discharge in sinter fume compared with low fuel and energy resource consumption, lower operating cost in the situation that.
For achieving the above object, the invention provides a kind of sintering machine partial fume denitrating system, it at least comprises: deduster, main exhauster of sintering, desulfurizer, desulfurization air-introduced machine, heat riser, denitrification apparatus, denitration air-introduced machine, not denitration flue and chimney;
Wherein, the entrance of described deduster is connected with the fume emission mouth of sintering device handpiece by pipeline, the outlet of described deduster is connected with the entrance of described desulfurizer by pipeline and is provided with main exhauster of sintering on this pipeline, not one end of denitration flue and the entrance of described heat riser described in the outlet of described desulfurizer is connected to by pipeline and threeway, and described desulfurization air-introduced machine is arranged near on the pipeline on the pipeline of described desulfurizer entrance or near described desulfurizer outlet, the outlet of described heat riser is connected with the entrance of described denitrification apparatus by pipeline, the outlet of described denitrification apparatus is connected in described chimney with the other end of described not denitration flue together with threeway by pipeline, before this three-way converging, be provided with described denitration air-introduced machine near on the pipeline of described denitration outlet,
Or, the entrance of described deduster is connected with the fume emission mouth of sintering device handpiece by pipeline, not one end of denitration flue and the entrance of described heat riser described in the outlet of described deduster is connected to by pipeline and threeway, and on the pipeline near described deduster outlet, be provided with described main exhauster of sintering before this distributing T-pipe, the outlet of described heat riser is connected with the entrance of described denitrification apparatus by pipeline, the outlet of described denitrification apparatus and the other end of described not denitration flue are connected in the entrance of described desulfurizer together with threeway by pipeline, and be provided with described denitration air-introduced machine near on the pipeline of described denitration outlet before this three-way converging, the outlet of described desulfurizer is connected in described chimney by pipeline, and described desulfurization air-introduced machine is placed near on the pipeline on the pipeline of described desulfurizer entrance or near described desulfurizer outlet.In the present invention, after denitrification apparatus and supporting heat riser thereof etc. and not denitration flue of the present invention can be wholy set in desulfurizer or before.
In above-mentioned system, preferably, described heat riser comprises one or more the combination in combustion furnace (or burner), electric heater and heat exchanger etc.This heat riser can take the mode of direct heat transfer also can take the mode of indirect heat exchange to heat up.
According to the specific embodiment of the present invention, preferably, in the time that said system adopts the scheme of denitrification apparatus after desulfurizer, said system also comprises heat-exchanger rig, described heat-exchanger rig is arranged on the inlet duct of described heat riser and the outlet conduit of described denitrification apparatus, be used for flue gas the denitration of preparing to enter the flue gas after desulfurization of heat riser and discharge from denitrification apparatus to carry out heat exchange, adopt heat-exchanger rig can make the waste heat of flue gas after denitration be fully used, can effectively alleviate the corrosion of low-temperature flue gas to flue and chimney after desulfurization, promote atmosphere hoist height simultaneously, reduce the impact on regional environmental quality.The flue gas of the higher temperature after denitration can also raise the mixed flue gas temperature of finally discharge, and its waste heat is further utilized thus.So when adopting low-temperature SCR carry out denitration, without adopting when above-mentioned heat-exchanger rig, also can reach the corrosion texts of low-temperature flue gas to flue and chimney after effective alleviation desulfurization.
In above-mentioned system, preferably, described desulfurizer is wet method, semidry method or dry desulfurization device.
In above-mentioned system, preferably, described denitrification apparatus is low temperature SCR denitration device or Medium temperature SCR denitrification apparatus.This denitrification apparatus can, for not yet there being at present the low temperature SCR denitration device of ripe application, can be also the conventional Medium temperature SCR denitrification apparatus of power industry, and it comprises supporting reducing agent system, control system etc.In a detailed description of the invention of the present invention, the catalyst in denitrification apparatus adopts temperature or low-temperature SCR catalyst in three layers of honeycomb type, and catalyst module size adopts 1910 × 970 × 1015mm, and catalyst percent opening is greater than 72%, and reducing agent adopts liquefied ammonia.In the time adopting Medium temperature SCR, the flue-gas temperature of denitration outlet is higher, and the flue gas that can set up heat-exchanger rig and heat riser entrance carries out heat exchange.In addition, in the time adopting Medium temperature SCR, the flue gas (desulfurizer bypass being set, after this bypass can initially be arranged at main exhauster of sintering, before stopping being arranged at the threeway that connects not denitration flue and heat riser inlet duct) that does not pass through desulfurization also can directly enter denitrification apparatus.
In above-mentioned system, preferably, described not denitration flue is provided with throttling arrangement.
In above-mentioned system, desulfurization air-introduced machine and desulfurizer relative position can have various ways, and for example desulfurization air-introduced machine can be arranged on before desulfurizer or below, can also merge and arrange with main exhauster of sintering.
According to the specific embodiment of the present invention, preferably, said system also comprises deduster after desulfurization (only semidry process desulfurizer configures deduster after this desulfurization), after described desulfurization, deduster is arranged near on the pipeline of the outlet of described desulfurizer (and before being positioned at desulfurization air-introduced machine), is used for the flue gas after desulfurization to carry out further dedusting.
The present invention also provides a kind of sintering machine partial fume denitrating method, its method for adopting above-mentioned sintering machine partial fume denitrating system to carry out denitration, and the method comprises the following steps:
Under the effect of main exhauster of sintering (main exhauster of sintering plays the effect that overcomes sintering machine and dust remover resistance) and desulfurization air-introduced machine (desulfurization air-introduced machine plays the effect that overcomes desulfurization resistance), make sintering device handpiece fume emission mouth discharge sinter fume after deduster carries out dedusting, enter desulfurizer and carry out desulfurization, a part in flue gas after desulfurization enters not denitration flue, another part in flue gas after desulfurization under the effect of denitration air-introduced machine after heat riser heats up, enter denitrification apparatus and carry out denitration, then mix with the flue gas after the desulfurization of denitration flue not, after mixing, flue gas is through smoke stack emission,
Or, under the effect of main exhauster of sintering, make sintering device handpiece fume emission mouth discharge sinter fume after deduster carries out dedusting, a part in flue gas after dedusting enters not denitration flue, another part in flue gas after dedusting under the effect of denitration air-introduced machine after heat riser heats up, enter denitrification apparatus and carry out denitration, then mix with the flue gas after the dedusting of denitration flue not, mixed flue gas enters desulfurizer and carries out desulfurization under the effect of desulfurization air-introduced machine, and the flue gas after desulfurization is through smoke stack emission.
In above-mentioned method, in the time adopting the technological process of denitration after first desulfurization, sinter fume can first pass through deduster and desulfurizer, makes dust and sulfur dioxide concentration in flue gas reach GB requirement.Can make the sulfur dioxide concentration in flue gas significantly reduce through desulfurizer, such as being down to 100mg/Nm
3below.
In above-mentioned method, preferably, the method for described desulfurization can adopt conventional wet method, dry method or semidry method etc.
In above-mentioned method, in the time adopting the technological process of denitration after first desulfurization, the flue-gas temperature after desulfurization is lower, does not reach SCR denitration temperature requirement, uses heat riser to heat up and can meet the temperature requirement of SCR denitration flue gas.In the time adopting the technological process of desulfurization after first denitration, still need heat riser to heat up to flue gas.The target temperature heating up requires to arrange according to denitration reaction.If adopt Medium temperature SCR denitration to be warmed up to 280-420 DEG C, if adopt low temperature SCR denitration to be warmed up to 150-200 DEG C.
In above-mentioned method, preferably, the denitration of carrying out in denitrification apparatus adopts low-temperature selective catalytic reduction method or middle temperature selective catalytic reduction method to carry out.
In above-mentioned method, preferably, the denitration efficiency in described denitrification apparatus is 60%-90% or higher.This denitration efficiency refers to the clearance of NOx in flue gas.This denitration efficiency can regulate by reducing agent dosage and the catalyst bed number of plies etc., and the setting value of this efficiency depends on that the exhaust gas volumn of carrying out denitration accounts for the factors such as the ratio of total exhaust gas volumn, NO after finally ensureing flue gas after denitration and the flue gas of denitration flue not mixing
xemission compliance.
In above-mentioned method, preferably, enter the exhaust gas volumn of denitration flue not and combine decision with the ratio of the exhaust gas volumn that enters denitrification apparatus through heat riser by the denitration efficiency in nitrogen oxides in effluent concentration, the denitrification apparatus of the nitrogen oxides in effluent concentration of pending processing, discharge, to ensure the NO in the flue gas of final discharge
xup to standard, and regulate by the throttling arrangement on denitration flue not and/or denitration air-introduced machine.In the time that discharge standard is tending towards strict, can reduce entering the not exhaust gas volumn of denitration flue and regulate.Generally speaking, entering the not exhaust gas volumn of denitration flue can be the 30%-100% (percent by volume) of exhaust gas volumn (technique of desulfurization after first denitration) after flue gas after desulfurization amount (technique of denitration after first desulfurization) or dedusting.
According to the specific embodiment of the present invention, preferably, after system of the present invention comprises desulfurization, when deduster, said method is further comprising the steps of: the flue gas after desulfurization enters after desulfurization that deduster carries out after dedusting that shunting again enters not denitration flue and heat riser or through smoke stack emission.
Sintering machine partial fume denitrating system of the present invention and method mainly have the following advantages: (1), a processing section flue gas, after making denitration, the higher flue gas flue gas lower with the temperature of not denitration of temperature mixes, obtain the mixed flue gas that temperature is relatively high, can effectively alleviate the problem of the low-temperature flue gas corrosion chimney bringing because of desulfurization, be conducive to promote smoke evacuation rising height, the impact of the reduction pollutant of amplitude peak on surrounding enviroment simultaneously; (2), at the NO ensureing in flue gas
xunder the prerequisite of emission compliance, only to partial fume denitrating, than whole denitrating flue gas, the fuel and/or the energy resource consumption that heat up for flue gas can significantly reduce, and disposal cost also declines to a great extent.In a word, adopt sintering machine partial fume denitrating system of the present invention and method to carry out sinter fume denitration, can compared with low fuel and energy resource consumption, lower operating cost in the situation that, can make the denitration efficiency of denitration partial fume reach 60%-90% even higher, make the flue gas of final discharge meet up-to-date GB requirement, realize nitrogen oxide qualified discharge, and there is the satisfied stricter emission request of certain ability.
Brief description of the drawings
Fig. 1 is the structural representation of the sintering machine partial fume denitrating system of the embodiment of the invention.
Fig. 2 is the structural representation of the sintering machine partial fume denitrating system of embodiment 1.
Fig. 3 is the structural representation of the sintering machine partial fume denitrating system of embodiment 2.
Primary clustering symbol description:
Deduster 1 desulfurizer 2 desulfurization air-introduced machines 3
Not denitration flue 7 chimneys 8 of heat riser 4 denitrification apparatus 5 denitration air-introduced machines 6
Deduster 11 heat-exchanger rigs 12 after sintering machine 9 main exhauster of sintering 10 desulfurization
Detailed description of the invention
Understand for technical characterictic of the present invention, object and beneficial effect being had more clearly, existing technical scheme of the present invention is carried out to following detailed description, but can not be interpreted as restriction that can practical range of the present invention.
In a detailed description of the invention of the present invention, as shown in Figure 1, sintering machine partial fume denitrating system of the present invention at least comprises: deduster 1, main exhauster of sintering 10, desulfurizer 2, desulfurization air-introduced machine 3, heat riser 4, denitrification apparatus 5, denitration air-introduced machine 6, not denitration flue 7 and chimney 8, wherein, the entrance of described deduster 1 is connected with the fume emission mouth of sintering machine 9 heads by pipeline, the outlet of described deduster 1 is connected with the entrance of described desulfurizer 2 by pipeline and on this pipeline, is provided with main exhauster of sintering 10, not one end of denitration flue 7 and the entrance of described heat riser 4 described in the outlet of described desulfurizer 2 is connected to by pipeline and threeway, on the pipeline exporting near described desulfurizer 2, be provided with described desulfurization air-introduced machine 3 before this distributing T-pipe, the outlet of described heat riser 4 is connected with the entrance of described denitrification apparatus 5 by pipeline, the outlet of described denitrification apparatus 5 is connected in described chimney 8 with the other end of described not denitration flue 7 together with threeway by pipeline, on the pipeline exporting near described denitrification apparatus 5, be provided with described denitration air-introduced machine 6 before this three-way converging.
In a detailed description of the invention of the present invention, sintering machine partial fume denitrating method of the present invention comprises the following steps: under the effect of main exhauster of sintering 10 and desulfurization air-introduced machine 3, the sinter fume that the fume emission mouth of sintering machine 9 heads is discharged carries out after dedusting through deduster 1, enter desulfurizer 2 and carry out desulfurization, a part in flue gas after desulfurization enters not denitration flue 7, another part in flue gas after desulfurization under the effect of denitration air-introduced machine 6 after heat riser 4 heats up, enter denitrification apparatus 5 and carry out denitration, then mix with the flue gas after the desulfurization of denitration flue 7 not, mixed flue gas discharges through chimney 8.
By specific embodiment, technical scheme of the present invention is elaborated below.
Embodiment 1
The present embodiment provides a kind of sintering machine partial fume denitrating system, as shown in Figure 2, it comprises: deduster 1, desulfurizer 2, desulfurization air-introduced machine 3, heat riser 4, denitrification apparatus 5, denitration air-introduced machine 6, deduster 11 after denitration flue 7, chimney 8, main exhauster of sintering 10 and desulfurization not;
Wherein, the entrance of described deduster 1 is connected with the fume emission mouth of sintering machine 9 heads by pipeline, the outlet of described deduster 1 is connected with the entrance of described desulfurizer 2 by pipeline and on this pipeline, is provided with described main exhauster of sintering 10, the outlet of described desulfurizer 2 is connected with the entrance of deduster 11 after described desulfurization by pipeline, after described desulfurization the outlet of deduster 11 be connected to by pipeline and threeway described in not one end of denitration flue 7 and the entrance of described heat riser 4, on the pipeline exporting near deduster 11 after described desulfurization, be provided with described desulfurization air-introduced machine 3 before this distributing T-pipe, the outlet of described heat riser 4 is connected with the entrance of described denitrification apparatus 5 by pipeline, the outlet of described denitrification apparatus 5 is connected in described chimney 8 with the other end of described not denitration flue 7 together with threeway by pipeline, on the pipeline exporting near described denitrification apparatus 5, be provided with described denitration air-introduced machine 6 before this three-way converging,
Described deduster 1 is electric cleaner; Described desulfurizer 2 is the semi-dry flue gas desulfurization device of this area routine; After described desulfurization, deduster 11 is the supporting sack cleaner of semi-dry flue gas desulfurization device; Described heat riser 4 is coke oven gas burner; Described denitrification apparatus 5 adopts low temperature SCR denitration reactor, in this SCR Benitration reactor, catalyst adopts three layers of honeycomb type low-temperature SCR catalyst, catalyst module size adopts 1910 × 970 × 1015 (mm), catalyst percent opening is greater than 72%, denitration efficiency is controlled at more than 80%, and reducing agent adopts liquefied ammonia.
Adopt the sintering machine partial fume denitrating system of the present embodiment to (operating mode flow 1,220,000 m of the flue gas from 200 square metres of sintering machines
3/ h) carrying out denitration, it comprises the following steps:
Under the effect of main exhauster of sintering 10 and desulfurization air-introduced machine 3, the sinter fume that the fume emission mouth of sintering machine 9 heads is discharged carries out after dedusting through deduster 1, enter desulfurizer 2 and carry out desulfurization, then after desulfurization, deduster 11 carries out dedusting again, obtain the flue gas after desulfurization, the exhaust gas volumn after this desulfurization is about 1,050,000 m
3/ h, temperature is 80 DEG C, SO
2concentration is 100mg/Nm
3, NO
xconcentration is 400mg/Nm
3, make 700,000 m in the flue gas after desulfurization
3/ h enters not denitration flue 7, makes 350,000 m in the flue gas after desulfurization
3/ h is warming up to after 180 DEG C through heat riser 4 under the effect of denitration air-introduced machine 6, enters denitrification apparatus 5 and carries out denitration, and denitration resistance is overcome by denitration air-introduced machine 6, controls denitration efficiency 80%, flue gas NO after denitration
xconcentration is 80mg/Nm
3, temperature is 160 DEG C, then make flue gas after denitration with through 700,000 m of denitration flue 7 not
3flue gas after/h desulfurization mixes, mixed flue gas NO
xconcentration is 293mg/Nm
3, temperature is 107 DEG C, discharges through chimney 8.
Embodiment 2
The present embodiment provides a kind of sintering machine partial fume denitrating system, as shown in Figure 3, it comprises: deduster 1, desulfurizer 2, desulfurization air-introduced machine 3, heat riser 4, denitrification apparatus 5, denitration air-introduced machine 6, not denitration flue 7, chimney 8, main exhauster of sintering 10 and heat-exchanger rig 12;
Wherein, the entrance of described deduster 1 is connected with the fume emission mouth of sintering machine 9 heads by pipeline, the outlet of described deduster 1 is connected with the entrance of described desulfurizer 2 by pipeline and on this pipeline, is provided with described main exhauster of sintering 10, not one end of denitration flue 7 and the entrance of described heat riser 4 described in the outlet of described desulfurizer 2 is connected to by pipeline and threeway, on the pipeline exporting near described desulfurizer 2, be provided with described desulfurization air-introduced machine 3 before this distributing T-pipe, the outlet of described heat riser 4 is connected with the entrance of described denitrification apparatus 5 by pipeline, described heat-exchanger rig 12 is arranged on the inlet duct of described heat riser and the outlet conduit of described denitrification apparatus, be used for flue gas the denitration of preparing to enter the flue gas after desulfurization of heat riser and discharge from denitrification apparatus to carry out heat exchange, the outlet (being connected in after described heat-exchanger rig 12 by pipeline) of described denitrification apparatus 5 is connected in described chimney 8 with the other end of described not denitration flue 7 together with threeway by pipeline, before this three-way converging and on heat-exchanger rig 12 pipeline below, be provided with described denitration air-introduced machine 6,
Described deduster 1 is electric cleaner; Described desulfurizer 2 is the wet flue gas desulfurizer of this area routine; Described heat riser 4 is blast furnace gas burner; Described denitrification apparatus 5 adopts the conventional SCR Benitration reactor of power industry, in this SCR Benitration reactor, catalyst adopts three layers of honeycomb type Medium temperature SCR catalyst, catalyst module size adopts 1910 × 970 × 1015 (mm), catalyst percent opening is greater than 72%, denitration efficiency is controlled at more than 90%, and reducing agent adopts liquefied ammonia.
Adopt the sintering machine partial fume denitrating system of the present embodiment to (operating mode flow 2,210,000 m of the flue gas from 360 square metres of sintering machines
3/ h) carrying out denitration, it comprises the following steps:
Under the effect of main exhauster of sintering 10 and desulfurization air-introduced machine 3, the sinter fume that the fume emission mouth of sintering machine 9 heads is discharged carries out after dedusting through deduster 1, enters desulfurizer 2 and carries out desulfurization, approximately 1,780,000 m of the exhaust gas volumn after desulfurization
3/ h, temperature is 55 DEG C, SO
2concentration is 100mg/Nm
3, NO
xconcentration is 450mg/Nm
3, make 1,120,000 m in the flue gas after desulfurization
3/ h enters not denitration flue 7, makes 660,000 m in the flue gas after desulfurization
3flue gas heat exchange to 150 DEG C after the denitration that/h first exports through heat-exchanger rig 12 and denitrification apparatus 5 under the effect of denitration air-introduced machine 6, be warming up to after 280 DEG C through heat riser 4 again, enter denitrification apparatus 5 and carry out denitration, denitration resistance is overcome by denitration air-introduced machine 6, control denitration efficiency 90%, flue gas NO after denitration
xconcentration is 45mg/Nm
3, the temperature after heat-exchanger rig 12 heat exchange of the flue gas after denitration is down to 160 DEG C, then make flue gas after denitration heat exchange cooling with through 1,120,000 m of denitration flue 7 not
3flue gas after/h desulfurization mixes, mixed flue gas NO
xconcentration is 299mg/Nm
3, temperature is 94 DEG C, discharges through chimney 8.
The sintering machine partial fume denitrating system of an embodiment 1 and embodiment 2 and method processing section flue gas, can make whole fume emissions up to standard, and the whole flue gas disposal costs of partial fume disposal cost decline to a great extent, in embodiment 1, flue gas after desulfurization amount is 1,050,000 m
3/ h, only processes 350,000 m by denitrating system and the method for embodiment 1
3/ h can be up to standard, and processing cost has declined approximately 60%.And in embodiment 2 after denitration the waste heat of flue gas can be fully used, after denitration, flue gas first carries out heat exchange with flue gas after desulfurization, then not denitration flue gas to 94 DEG C of its waste heat, can effectively alleviate the corrosion of low-temperature flue gas to flue and chimney after desulfurization, promote atmosphere hoist height simultaneously, reduce the impact on regional environmental quality.
Claims (10)
1. a sintering machine partial fume denitrating system, it at least comprises: deduster, main exhauster of sintering, desulfurizer, desulfurization air-introduced machine, heat riser, denitrification apparatus, denitration air-introduced machine, not denitration flue and chimney;
Wherein, the entrance of described deduster is connected with the fume emission mouth of sintering device handpiece by pipeline, the outlet of described deduster is connected with the entrance of described desulfurizer by pipeline and is provided with main exhauster of sintering on this pipeline, not one end of denitration flue and the entrance of described heat riser described in the outlet of described desulfurizer is connected to by pipeline and threeway, and described desulfurization air-introduced machine is arranged near on the pipeline on the pipeline of described desulfurizer entrance or near described desulfurizer outlet, the outlet of described heat riser is connected with the entrance of described denitrification apparatus by pipeline, the outlet of described denitrification apparatus is connected in described chimney with the other end of described not denitration flue together with threeway by pipeline, and be provided with described denitration air-introduced machine near on the pipeline of described denitration outlet before this three-way converging,
Or, the entrance of described deduster is connected with the fume emission mouth of sintering device handpiece by pipeline, not one end of denitration flue and the entrance of described heat riser described in the outlet of described deduster is connected to by pipeline and threeway, and on the pipeline near described deduster outlet, be provided with described main exhauster of sintering before this distributing T-pipe, the outlet of described heat riser is connected with the entrance of described denitrification apparatus by pipeline, the outlet of described denitrification apparatus and the other end of described not denitration flue are connected in the entrance of described desulfurizer together with threeway by pipeline, and be provided with described denitration air-introduced machine near on the pipeline of described denitration outlet before this three-way converging, the outlet of described desulfurizer is connected in described chimney by pipeline, and described desulfurization air-introduced machine is placed near on the pipeline on the pipeline of described desulfurizer entrance or near described desulfurizer outlet.
2. system according to claim 1, wherein, described heat riser comprises one or more the combination in combustion furnace, electric heater and heat exchanger.
3. system according to claim 1, it also comprises heat-exchanger rig, described heat-exchanger rig is arranged on the inlet duct of described heat riser and the outlet conduit of described denitrification apparatus, is used for flue gas the denitration of preparing to enter the flue gas after desulfurization of heat riser and discharge from denitrification apparatus to carry out heat exchange.
4. system according to claim 1, wherein, described desulfurizer is wet method, semidry method or dry desulfurization device.
5. system according to claim 1, wherein, described denitrification apparatus is low temperature SCR denitration device or Medium temperature SCR denitrification apparatus.
6. system according to claim 1, wherein, described not denitration flue is provided with throttling arrangement.
7. a sintering machine partial fume denitrating method, it is the method that the sintering machine partial fume denitrating system described in employing claim 1-6 any one carries out denitration, the method comprises the following steps:
Under the effect of main exhauster of sintering and desulfurization air-introduced machine, make sintering device handpiece fume emission mouth discharge sinter fume after deduster carries out dedusting, enter desulfurizer and carry out desulfurization, a part in flue gas after desulfurization enters not denitration flue, another part in flue gas after desulfurization under the effect of denitration air-introduced machine after heat riser heats up, enter denitrification apparatus and carry out denitration, then mix with the flue gas after the desulfurization of denitration flue not, mixed flue gas is through smoke stack emission;
Or, under the effect of main exhauster of sintering, make sintering device handpiece fume emission mouth discharge sinter fume after deduster carries out dedusting, a part in flue gas after dedusting enters not denitration flue, another part in flue gas after dedusting under the effect of denitration air-introduced machine after heat riser heats up, enter denitrification apparatus and carry out denitration, then mix with the flue gas after the dedusting of denitration flue not, mixed flue gas enters desulfurizer and carries out desulfurization under the effect of desulfurization air-introduced machine, and the flue gas after desulfurization is through smoke stack emission.
8. method according to claim 7, wherein, the denitration of carrying out in denitrification apparatus adopts low-temperature selective catalytic reduction method or middle temperature selective catalytic reduction method to carry out.
9. method according to claim 7, wherein, the denitration efficiency in described denitrification apparatus is 60%-90%.
10. method according to claim 7, wherein, enter the exhaust gas volumn of denitration flue not and combine decision with the ratio of the exhaust gas volumn that enters denitrification apparatus through heat riser by the denitration efficiency in nitrogen oxides in effluent concentration, the denitrification apparatus of the nitrogen oxides in effluent concentration of pending processing, discharge, and regulate by throttling arrangement and/or denitration air-introduced machine on denitration flue not.
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