CN204699585U - A kind of device removing coking nitrogen oxides in effluent - Google Patents
A kind of device removing coking nitrogen oxides in effluent Download PDFInfo
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- CN204699585U CN204699585U CN201520230569.7U CN201520230569U CN204699585U CN 204699585 U CN204699585 U CN 204699585U CN 201520230569 U CN201520230569 U CN 201520230569U CN 204699585 U CN204699585 U CN 204699585U
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Abstract
Remove a device for coking nitrogen oxides in effluent, relate to coking flue gases purification field, for removing the nitrogen oxide in coking flue gas at low temperatures.Set gradually and end to end heat exchanger before and after comprising, preheater, reducing agent sprays premixed device, static mixer and catalytic reactor, spray on premixed device at described reducing agent and be provided with the reducing agent spray gun filling ammonia, fully mixed in static mixer with coking flue gas by the ammonia that arranges of some groups of disks, the catalytic reduction catalysts layer arranged before and after being provided with in described catalytic reactor and catalyst for catalytic oxidation layer, described catalytic reduction catalysts layer comprises denitration catalyst oxidant layer and rare earth metal layer, increase gradually along the density of catalyst in the catalytic reduction catalysts layer of air current flow direction.This device mixes after flue gas with reducing agent, and then reacts with catalytic reduction catalysts, can remove nitrogen oxide at low temperatures, reaches the object of purifying smoke.
Description
Technical field
The utility model relates to coking plant and sintering device flue gas purification techniques field, specifically a kind of device removing coking nitrogen oxides in effluent.
Background technology
Coking plant is the process units that China's steel industry generally uses, and the exhaust gas volumn of generation is very large.There is many chemical reactions in process of production, various pollutant can be generated, comprise SO
2, CO, CO
2, the atmosphere pollution such as dust, it can be control effectively by existing comparatively ripe pollution control technology, but produces nitrogen oxide and there is no effective K cryogenic treatment means.The nitrogen oxide of carbonization produced life is the important pollutant of pollutant atmosphere, and nitrogen oxide produces serious " Huanglong "; Can in the enrichment of people's cylinder accumulation, very harmful.Coking flue gas, will serious environment pollution as realized qualified discharge without purified treatment, harm air quality.Mostly current fume treatment technology is SCR denitration, just for the nitrogen oxide in flue gas, and is need flue gas vertical for about 1,000,000 marks to be heated to 350 DEG C from 90 DEG C, wastes a large amount of heats.Traditional gas denitrifying technology, the activity of catalyst is low, needs flue-gas temperature to carry out denitration at about 350 DEG C.The Sulphur Dioxide so just guaranteeing in the flue gas hydrogen sulfate ammonia (ABS) that to be sulfur trioxide generate with the ammonia gas react sprayed into can not condense.The concentration of ammonia and the concentration of SO3, at 200 DEG C to 260 DEG C, are depended in the general branch of dew-point temperature of ABS.There is the character of similar glue, gluing very after ABS condensation, the outer surface of easy blocking catalyst, thus cause the physics of catalyst poisoning.Therefore remove the device of coking nitrogen oxides in effluent under being badly in need of a kind of low temperature, realize the high-efficient purification to coking flue gas.
Utility model content
The purpose of this utility model is to provide a kind of device removing coking nitrogen oxides in effluent, at low temperatures for removing the nitrogen oxide in coking flue gas.
The technical scheme in the invention for solving the technical problem is: a kind of device removing coking nitrogen oxides in effluent, it is characterized in that, set gradually before and after comprising and the injection of end to end heat exchanger, preheater, reducing agent premixed device, static mixer and catalytic reactor, described heat exchanger is provided with cold side import, cold side outlet port, hot side-entrance and hot side outlet, described cold side import is the inlet port of sinter fume to be clean, described cold side outlet port is connected with the preheater import of preheater, and described hot side outlet is the sinter fume outlet after purification, described reducing agent sprays premixed device and comprises the import of reducing agent injection premixed device, reducing agent injection premixed device outlet and reducing agent spray gun, the import of described reducing agent injection premixed device exports with preheater and is connected, in described reducing agent spray gun, be provided with ammonia, described reducing agent sprays premixed device outlet and is connected with static mixer import, described static mixer is also provided with static mixer outlet and disk, in the inner chamber of static mixer, air current flow direction is provided with some groups of disks, the some disks often organized are positioned on the same cross section of static mixer, and the some disks often organized all with the flow direction of air-flow angle in an acute angle in static mixer, some constituent element disks be arranged so that the inner chamber of static mixer is divided into some mixed zones, described static mixer outlet is connected with catalytic reactor import, described catalytic reactor is also provided with catalytic reactor outlet, described catalytic reactor outlet is connected with hot side-entrance, described hot side-entrance is communicated with hot side outlet, and the passage between described hot side-entrance and hot side outlet and the passage between cold side import and cold side outlet port separate, the catalytic reduction catalysts layer arranged before and after being provided with in the inner chamber of described catalytic reactor and catalyst for catalytic oxidation layer, described catalytic reduction catalysts layer comprises denitration catalyst oxidant layer and rare earth metal layer, and increases gradually along the density of catalyst in catalytic reduction catalysts layer described in air current flow direction.
Further, described reducing agent injection premixed device has venturi tube structure.
Further, in described static mixer, four layers of mixed zone are disposed with.
Further, grid is provided with in the exit position of described reducing agent spray gun.
Further, described heat exchanger, preheater, reducing agent spray premixed device, static mixer and catalytic reactor and form a U-shaped structure.
Further, described acute angle angle is 20 degree to 50 degree.
Further, described acute angle angle is 30 degree.
Further, described disk comprises and is positioned at middle plectane and evenly arranges along plectane circumference and be fixed on the some wedge angles on plectane.
Further, described wedge angle is triangular structure, and angle is five.
The beneficial effects of the utility model are: a kind of device removing coking nitrogen oxides in effluent that the utility model provides, mix after flue gas with reducing agent, and then react with catalytic reduction catalysts, the nitrogen oxide in flue gas can be removed at low temperatures, reach the object of purifying smoke, purification efficiency is high.High temperature sintering flue gas after purification is through heat exchanger, heat exchange can be carried out with the sinter fume to be clean in heat exchanger, sinter fume temperature to be clean is raised and to a certain degree enters into preheater afterwards, the heating power of preheater can be reduced like this, play energy-conservation effect.ABS can not condense into the emplastic of similar glue, and then can not cover the outer surface of catalyst, ensure that the normal effect of catalyst.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model;
Fig. 2 is disc structure schematic diagram;
Fig. 3 is luminaire layout along circle schematic diagram;
In figure: 1 heat exchanger, 11 cold side imports, 12 cold side outlet port, 13 hot side-entrances, 14 hot side outlets, 2 preheaters, 21 preheater imports, 22 preheater outlets, 3 reducing agents spray premixed device, and 31 reducing agents spray premixed device import, 32 reducing agents spray premixed device outlet, 33 reducing agent spray guns, 4 static mixers, 41 static mixer imports, 42 static mixer outlets, 43 disks, 44 crossbeams, 5 catalytic reactors, 51 catalytic reactor imports, 52 catalytic reactor outlets, 53 catalytic reduction catalysts layers, 54 catalyst for catalytic oxidation layers.
Detailed description of the invention
As shown in Figure 1, the heat exchanger 1 set gradually before and after the utility model comprises, preheater 2, reducing agent spray premixed device 3, static mixer 4 and catalytic reactor 5, connect in turn before and after above-mentioned each parts and form a U-shaped structure, below in conjunction with accompanying drawing, the utility model being described.
As shown in Figure 1, heat exchanger 1 has four flue gas interfaces, be respectively cold side import 11, cold side outlet port 12, hot side-entrance 13 and hot side outlet 14, wherein cold side import 11 is the inlet port of sinter fume to be clean, the temperature of this sinter fume to be clean is generally 155 DEG C, and the inside of heat exchanger is heat exchanger tube or heat exchanger plates.Be provided with preheater 2 at the rear side of heat exchanger, preheater is provided with preheater import 21 and preheater outlet 22, and preheater import 21 is connected with the cold side outlet port 12 of heat exchanger.
Be provided with reducing agent at the rear side of preheater and spray premixed device 3, spray at reducing agent and premixed device is provided with reducing agent sprays premixed device import 31, reducing agent sprays premixed device outlet 32 and reducing agent spray gun 33, the reducing agent that preheater outlet 22 and reducing agent spray premixed device 3 sprays premixed device import 31 and is connected.Reducing agent sprays the pipeline section that premixed device is a venturi tube structure, is provided with reducing agent spray gun 33 before trunnion section.Injection of reducing agent injects in reducing agent injection premix barrel and mixes with flue gas by reducing agent spray gun, and according to Venturi tube principle, reducing agent can be mixed into rapidly the central also rapid vaporization of flue gas.For increasing mixed effect, being provided with grid in the exit position of reducing agent spray gun, when reducing agent ammonia is sprayed, occupying larger space.
The rear side spraying premixed device at reducing agent is provided with static mixer 4, and static mixer is provided with static mixer import 41, static mixer outlet 42 and disk 43, and reducing agent sprays premixed device outlet 32 and is connected with static mixer import 41.In the inner chamber of static mixer, be provided with some groups of disks 43 successively along air current flow direction, the inner chamber of static mixer is divided into some layers of mixed zone by some groups of disks 43, is provided with four layers of mixed zone in the present embodiment.As shown in Figure 2, each disk 43 comprises five the leg-of-mutton wedge angles 432 being positioned at middle plectane 431 and being circumferentially evenly arranged on plectane, as shown in Figure 3, some disks often in group are all arranged on the same cross section of static mixer, and each disk all with the flow direction of flue gas angle in an acute angle in static mixer, this acute angle value is between 20 degree to 50 degree, and preferably this angle angle value is 30 degree.Some disks often in group be arranged in parallel, be provided with crossbeam 44, be fixed together by some disks by crossbeam, and crossbeam is fixedly connected with the inwall of static mixer between the some disks often organized.In every layer of mixed zone, reducing agent fully mixes with coking flue gas, and the whole design of static mixer U-shaped and the setting of disk, be convenient to the heat exchange of heat smoke and cold flue gas.
Catalytic reactor 5 is provided with at the rear side of static mixer 4, catalytic reactor is provided with catalytic reactor import 51, catalytic reactor outlet 52, catalytic reduction catalysts layer 53 and catalyst for catalytic oxidation layer 54, static mixer outlet 42 is connected with catalytic reactor import 51, and catalytic reactor outlet 52 is connected with hot side-entrance 13.Catalytic reduction catalysts layer 53 comprises denitration catalyst oxidant layer and rare earth metal layer, and catalytic reduction catalysts layer is arranged on the front side of catalyst for catalytic oxidation layer, and flue gas is successively through catalytic reduction catalysts layer and catalyst for catalytic oxidation layer.The setting of catalytic reduction catalysts layer has the function removing nitrogen oxide, and the setting of catalyst for catalytic oxidation layer has the effect removing volatile organic matter.Density along the catalyst in the flow direction catalytic reduction catalysts layer of coking flue gas in catalytic reactor is increasing, and coking flue gas can be made like this to be reduced by resistance during catalytic reduction catalysts layer; Meanwhile, be in the catalyst reaction that a part of coking flue gas of flow regime is first less with density, the coking flue gas that another part has little time the catalyst reaction little with density continues to flow, the catalyst reaction large with rear side density.Like this, can make whole coking flue gases can with catalyst reaction, ensure to remove the efficiency of coking nitrogen oxides in effluent.
Catalytic reactor outlet is connected with hot side-entrance, and hot side-entrance is communicated with hot side outlet, and forms the first passage of the coking flue gas outflow after purification between hot side-entrance and hot side outlet.Form the second channel that coking flue gas to be clean enters heat exchanger between cold side import and cold side outlet port, first passage and second channel are all arranged in heat exchanger, and first passage and second channel separate.Coking flue gas after purification can carry out heat exchange with coking flue gas to be clean, raise to make coking flue-gas temperature to be clean, after coking flue gas to be clean after temperature raises enters into preheater, less heating power can be adopted to heat it, play energy-conservation effect.
Coking flue gas to be clean carries out preheating after entering heat exchanger, and flue-gas temperature enters into preheater through cold side outlet port after raising.By combustion gas, the flue gas after preheating is heated in preheater, can by flue gas to 240 DEG C between 260 DEG C, flue gas can carry out catalytic reaction at such a temperature.Flue gas after heating up in preheater enters into reducing agent and sprays premixed device, reducing agent spray gun sprays in premixed device to reducing agent and sprays into reducing agent, reducing agent and the flue gas after heating up enter into static mixer subsequently, in static mixer, be provided with four layers of flue gas static mixing layer, in flue gas static mixing layer, flue gas fully mixes with reducing agent.The mixture of reducing agent and flue gas enters into catalytic reactor, and the recall reducing catalyst in catalytic reactor and flue gas, reducing agent react, and remove the nitrogen oxide in flue gas.The flue gas having carried out removing nitrogen oxide flows out through hot side outlet 14.Flue gas can reach the purification of nitrogen oxides efficiency of more than 98% by catalyst.For ensureing the efficiency of heating surface, preheater adopts gas heating or electrically heated mode to heat coking flue gas.Set gradually before and after above-mentioned each parts and form a U-shaped, the size of length direction can be reduced, to make full use of the space in workshop.
Claims (9)
1. one kind removes the device of coking nitrogen oxides in effluent, it is characterized in that, set gradually before and after comprising and the injection of end to end heat exchanger, preheater, reducing agent premixed device, static mixer and catalytic reactor, described heat exchanger is provided with cold side import, cold side outlet port, hot side-entrance and hot side outlet, described cold side import is the inlet port of sinter fume to be clean, described cold side outlet port is connected with the preheater import of preheater, and described hot side outlet is the sinter fume outlet after purification, described reducing agent sprays premixed device and comprises the import of reducing agent injection premixed device, reducing agent injection premixed device outlet and reducing agent spray gun, the import of described reducing agent injection premixed device exports with preheater and is connected, in described reducing agent spray gun, be provided with ammonia, described reducing agent sprays premixed device outlet and is connected with static mixer import, described static mixer is also provided with static mixer outlet and disk, in the inner chamber of static mixer, air current flow direction is provided with some groups of disks, the some disks often organized are positioned on the same cross section of static mixer, and the some disks often organized all with the flow direction of air-flow angle in an acute angle in static mixer, some constituent element disks be arranged so that the inner chamber of static mixer is divided into some mixed zones, described static mixer outlet is connected with catalytic reactor import, described catalytic reactor is also provided with catalytic reactor outlet, described catalytic reactor outlet is connected with hot side-entrance, described hot side-entrance is communicated with hot side outlet, and the passage between described hot side-entrance and hot side outlet and the passage between cold side import and cold side outlet port separate, the catalytic reduction catalysts layer arranged before and after being provided with in the inner chamber of described catalytic reactor and catalyst for catalytic oxidation layer, described catalytic reduction catalysts layer comprises denitration catalyst oxidant layer and rare earth metal layer, and increases gradually along the density of catalyst in catalytic reduction catalysts layer described in air current flow direction.
2. a kind of device removing coking nitrogen oxides in effluent according to claim 1, is characterized in that, described reducing agent sprays premixed device and has venturi tube structure.
3. a kind of device removing coking nitrogen oxides in effluent according to claim 1, is characterized in that, is disposed with four layers of mixed zone in described static mixer.
4. a kind of device removing coking nitrogen oxides in effluent according to claim 1, is characterized in that, is provided with grid in the exit position of described reducing agent spray gun.
5. a kind of device removing coking nitrogen oxides in effluent according to claim 1, is characterized in that, described heat exchanger, preheater, reducing agent spray premixed device, static mixer and catalytic reactor and form a U-shaped structure.
6. a kind of device removing coking nitrogen oxides in effluent according to claim 1, is characterized in that, described acute angle angle is 20 degree to 50 degree.
7. a kind of device removing coking nitrogen oxides in effluent according to claim 6, is characterized in that, described acute angle angle is 30 degree.
8. a kind of device removing coking nitrogen oxides in effluent according to claim 1, is characterized in that, described disk comprises and is positioned at middle plectane and evenly arranges along plectane circumference and be fixed on the some wedge angles on plectane.
9. a kind of device removing coking nitrogen oxides in effluent according to claim 8, is characterized in that, described wedge angle is triangular structure, and angle is five.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520230569.7U CN204699585U (en) | 2015-04-16 | 2015-04-16 | A kind of device removing coking nitrogen oxides in effluent |
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| CN201520230569.7U CN204699585U (en) | 2015-04-16 | 2015-04-16 | A kind of device removing coking nitrogen oxides in effluent |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106765244A (en) * | 2016-12-21 | 2017-05-31 | 神华集团有限责任公司 | Three wastes stove combustion system and denitration method for flue gas |
| CN106958936A (en) * | 2016-01-12 | 2017-07-18 | 沈阳兰昊新能源科技有限公司 | Environment-friendly biomass straw fuel boiler |
-
2015
- 2015-04-16 CN CN201520230569.7U patent/CN204699585U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106958936A (en) * | 2016-01-12 | 2017-07-18 | 沈阳兰昊新能源科技有限公司 | Environment-friendly biomass straw fuel boiler |
| CN106765244A (en) * | 2016-12-21 | 2017-05-31 | 神华集团有限责任公司 | Three wastes stove combustion system and denitration method for flue gas |
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