CN203447975U - SNCR (Selective Non Catalytic Reduction) denitration device - Google Patents

SNCR (Selective Non Catalytic Reduction) denitration device Download PDF

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CN203447975U
CN203447975U CN201320396555.3U CN201320396555U CN203447975U CN 203447975 U CN203447975 U CN 203447975U CN 201320396555 U CN201320396555 U CN 201320396555U CN 203447975 U CN203447975 U CN 203447975U
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benitration reactor
denitration
temperature
fuel
sncr
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CN201320396555.3U
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张蕊
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张蕊
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Abstract

The utility model relates to an SNCR (Selective Non Catalytic Reduction) denitration device which comprises a denitration reactor (1), a fuel jet control device (2), a temperature control device (3), a reducing agent spraying device (4), a denitration reactor outlet flue (5), a denitration reactor inlet flue (6) and a fuel system controller (8), wherein the fuel jet control device (2), the temperature control device (3), the reducing agent spraying device (4), the denitration reactor outlet flue (5) and the denitration reactor inlet flue (6) are arranged on the denitration reactor (1); and the fuel jet control device (2) is connected with the temperature control device (3) through the fuel system controller (9). The SNCR denitration device provided by the utility model is high in efficiency, little in investment and good in heat recovery benefit.

Description

A kind of SNCR denitrification apparatus
Technical field
The utility model relates to a kind of denitrification apparatus, relates in particular to a kind of SNCR(SNCR) denitrification apparatus.
Background technology
Two kinds of the selective catalytic reduction of denitration technology (SCR) of domestic contrast maturation and SNCRs (SNCR).
SCR denitration technology refer under catalyst action and uniform temperature (320-420 ℃) under, the reacting with reducing agent and generate nitrogen G&W of the nitrous oxides selectivity in flue gas, reaches the object of removing nitrogen oxide.In SCR denitration technology, mostly use V 2o 5for the titania-based catalyst of carrier, its best catalytic temperature is 302~402 ℃, the strongest 350 ℃ of left and right activity.Glass furnace smoke discharging is emitted temperature 450 ℃ of left and right, thus first should carry out heat exchange, cigarette temperature drop to 355 ℃ left and right.In addition, in SCR denitration technology, catalyst costs is expensive, accounts for 40~60% of whole denitrating system device total cost.Prevent the activity of catalyst poisoning, obstruction, maintenance catalyst, increasing the service life is the another key of SCR denitrating system.
SO in large glass furnace flue gas 2and dust is to V 2o 5for the titania-based catalyst of carrier is very disadvantageous, easily cause catalyst poisoning or obstruction; And K in flue gas, Na content are more, and K, Na can enter easily the pore of catalyst under the state of the aqueous solution, cause and stop up and be difficult to cleaning.Therefore, before SCR, first flue gas is carried out to desulfurization and dedusting.Conventionally the method dry desulfurization+high temperature electrostatic dedusting+SCR ammonia-method denitration adopting.High temperature electrostatic dedusting domestic technique is also immature, and many critical components and technology all will be from external introductions, and the desulfurization of SCR method just increases greatly for glass industry cost like this, thereby has limited the application of SCR denitration technology.
The denitration of SNCR method refers under the effect of catalyst-free, and in " temperature window " that be applicable to denitration reaction, spraying into reducing agent is harmless nitrogen G&W by the reduction of nitrogen oxide in flue gas.This technology generally adopts in stove sprays ammonia, urea or hydrogen propylhomoserin as reducing agent reductive NO x.The NO of reducing agent only and in flue gas xreaction, does not generally react with oxygen, and this technology does not adopt catalyst, is in this way called as SNCR method (SNCR).
As CN101890279A discloses a kind of high-efficiency ammonia-method denitration process and device thereof, by an ammonia, heat first normal temperature atomized ammonia solution or urea liquid in advance of supercharging mixer, then after high-temperature gasification supercharging, spray in the denitration reaction district in flue gas generation source, make fully to mix and haptoreaction with flue gas.CN102274687A discloses a kind of SNCR equipment for denitrifying flue gas that urea is reducing agent of take.Comprise solid urea tank car, flexible pipe, articulation, solid urea control valve, solid urea storage tank, solid urea batcher, pneumatic manifold, compressed air regulating valve, agitator, urea liquid preparation tank, heater, industry water house steward, industry water control valve, urea delivery pump, urea liquid holding vessel, urea-spray pump, blender, urea return valve, industrial water regulating valve pressurizes, industrial water pump, urea weak solution control valve, atomizing steam control valve, atomizing steam house steward, urea-spray unit.When canned urea, realize full-automatic continuous-feeding, guarantee concentration and the uniformity of urea liquid, according to combustion apparatus NO xdischarge capacity regulates urea flow automatically, makes combustion apparatus NO xdischarge capacity is in control range, and denitration effect is 60%; At packed urea, for seasonable, by manually dropping into urea liquid preparation tank, urea preparation adopts intermitten service mode.
Because SNCR technique is without catalyst, therefore must add reducing agent in high-temperature region.While being ammonia such as denitrfying agent, reaction temperature is 850-1100 ℃, and when flue-gas temperature is greater than 1050 ℃, ammonia will start to be oxidized to NO x, to the speed of 1100 ℃ of oxidations, will obviously accelerate, reduced on the one hand denitration efficiency; Consumption and the cost of reducing agent have been increased on the other hand.When the temperature of flue gas is during lower than 870 ℃, the reaction speed of denitration significantly reduces.
Due to the cause of reaction temperature window, setting, the switching of reaction time and spray ammonia point, the restriction that arranged by boiler furnace and heating surface.The lower 30%-50% that is generally of denitration efficiency.That is to say and adopt SNCR method in burner hearth, to be difficult to form stable reaction warm area, reaction does not thoroughly cause denitration efficiency very low.
Utility model content
For the deficiencies in the prior art, the purpose of this utility model is to provide a kind of SNCR denitrification apparatus.Utilize the SNCR denitrification apparatus that the utility model provides to carry out denitration, invest little, operation cost is low, safe and efficient, in the situation that not using catalyst, obtain very high denitration efficiency.
The key of method of denitration of the present utility model is to set up a stable high temperature SNCR reaction warm area, denitration reaction can fully be carried out, and waste heat can make full use of.
For reaching this object, the utility model adopts following technological means:
The denitrification apparatus of a kind of SNCR, comprise Benitration reactor (1), fuel injection control system (2), temperature control equipment (3), injection of reducing agent injection device (4), Benitration reactor exhaust pass (5), Benitration reactor inlet flue duct (6), fuel system controller (9), described fuel injection control system (2), temperature control equipment (3), injection of reducing agent injection device (4), Benitration reactor exhaust pass (5), Benitration reactor inlet flue duct (6) are installed in (1) on Benitration reactor; Described fuel injection control system (2) is connected with described temperature control equipment (3) by described fuel system controller (9).
Because denitrating system is used the denitration of SNCR method, be therefore necessary the temperature in Benitration reactor to remain on a stable warm area.In denitrification apparatus of the present utility model, fuel injection control system is connected with temperature control equipment in tower, can regulate the temperature in Benitration reactor by controlling the emitted dose of fuel, finally make temperature remain on stable region, can guarantee that reducing agent is not oxidized can obtain higher denitration efficiency again.
As optimal technical scheme, device described in the utility model, arranges heat exchanger (7) between described Benitration reactor exhaust pass (5) and described Benitration reactor inlet flue duct (6).
As optimal technical scheme, device described in the utility model, described heat exchanger (7) connects Waste Heat Power Station (8).
Reacted high-temperature flue gas does not enter Waste Heat Power Station generating after the former flue gas of denitration through heat exchanger heats, and waste heat is recycled, and can reduce on the whole the cost of denitration.After entering desulfurizing tower desulfurization, Waste Heat Power Station flue gas out enters atmosphere.
As optimal technical scheme, device described in the utility model, described fuel injection control system (2) is connected with described temperature control equipment (3), between described Benitration reactor exhaust pass (5) and described Benitration reactor inlet flue duct (6), heat exchanger (7) is set, described heat exchanger (7) connects Waste Heat Power Station (8).
Utilize device described in the utility model to carry out the method for denitration, the interior temperature of described Benitration reactor (1) is 800-1100 ℃, such as being 820 ℃, 840 ℃, 860 ℃, 875 ℃, 885 ℃, 890 ℃, 920 ℃, 940 ℃, 970 ℃, 990 ℃, 1020 ℃, 1060 ℃, 1080 ℃, 1095 ℃ etc., when denitration temperature is during higher than 1100 ℃, the oxidation rate of the reducing agent using when out of stock is obviously accelerated, not only reduced denitration efficiency, and increased the consumption of reducing agent, thereby cause cost to rise; When temperature is during lower than 800 ℃, denitration speed reduces greatly, thus the utility model to select denitration temperature be 800-1100 ℃, be preferably 850-1050 ℃, more preferably 950-1050 ℃.
In method of denitration, the reducing agent in described injection of reducing agent injection device (4) is urea.The best window temperature of urea reduction is 950-1040 ℃, the best window temperature of reducing while being ammoniacal liquor higher than reducing agent, but because its molecular momentum is larger, be more suitable for the denitration application in large scale industry boiler.
Preferably, described fuel is petroleum coke powder.
Described method, the former flue gas that Benitration reactor inlet flue duct (6) is come in described in described Benitration reactor exhaust pass (5) clean flue gas out.
Described method, described Benitration reactor exhaust pass (5) clean flue-gas temperature is out 900-1100 ℃, such as being 910 ℃, 920 ℃, 935 ℃, 955 ℃, 965 ℃, 980 ℃, 1050 ℃, 1070 ℃, 1090 ℃ etc., be preferably 950-1000 ℃, more preferably 1000 ℃.
Described method, the former flue-gas temperature that described Benitration reactor inlet flue duct (6) is come in is 350-550 ℃, such as being 355 ℃, 360 ℃, 380 ℃, 405 ℃, 415 ℃, 430 ℃, 460 ℃, 490 ℃, 505 ℃, 510 ℃, 520 ℃, 535 ℃, 545 ℃ etc., be preferably 400-500 ℃, more preferably 450 ℃.
Described method, the interior temperature of described Benitration reactor (1) is 800-1100 ℃, is preferably 850-1050 ℃, more preferably 950-1050 ℃; Reducing agent in described injection of reducing agent injection device (4) is urea; The former flue gas that described in described Benitration reactor exhaust pass (5) clean flue gas out, Benitration reactor inlet flue duct (6) is come in; Described Benitration reactor exhaust pass (5) clean flue-gas temperature is out 900-1100 ℃; The former flue-gas temperature that described Benitration reactor inlet flue duct (6) is come in is 350-550 ℃.
The beneficial effects of the utility model:
1, efficiency is high, and because warm area is stable, amino can at high temperature fully react with nitrogen oxide.
2, small investment, equipment is simply compared with SCR and is not needed to arrange high-temperature dust removal equipment and expensive catalyst.
3, recuperation of heat is profitable, and the high-temperature flue gas after denitration can be used to cogeneration.
Accompanying drawing explanation
Fig. 1 is SNCR denitrification apparatus of the present utility model;
Fig. 2 is Benitration reactor Local map in SNCR denitrification apparatus of the present utility model.
In figure: 1-Benitration reactor; 2-fuel injection control system; 3-temperature control equipment; 4-injection of reducing agent injection device; 5-Benitration reactor exhaust pass; 6-Benitration reactor inlet flue duct; 7-heat exchanger; 8-Waste Heat Power Station; 9-fuel system controller; 10-deduster; 11-reducing agent tank car; 12-conveying worm; The star-like discharger of 13-; 14-reductant solution; 15-reductant solution pond; 16-solution pump; 17-roots blower; 18-industrial furnace; 19-reducing agent warehouse.
The specific embodiment
For ease of understanding the utility model, it is as follows that the utility model is enumerated embodiment.Those skilled in the art should understand, described embodiment only, for helping to understand the utility model, should not be considered as concrete restriction of the present utility model.
As no specific instructions, various raw material of the present utility model all can obtain by commercially available; Or prepare according to the conventional method of this area.Unless otherwise defined or described herein, the familiar meaning of all specialties used herein and scientific words and those skilled in the art is identical.In addition any method similar or impartial to described content and material all can be applicable in the utility model method.
The experimental technique of unreceipted actual conditions in the following example, measures according to national standard conventionally.If there is no corresponding national standard, according to general international standard, normal condition or the condition of advising according to manufacturer, carry out.Unless otherwise indicated, otherwise all umbers are weight portion, and all percentages are weight percentage.
Below with reference to accompanying drawing and preferred embodiment, feature of the present utility model and advantage are described in further detail.
Embodiment
The denitrification apparatus of SNCR of the present utility model, comprise Benitration reactor (1), fuel injection control system (2), temperature control equipment (3), injection of reducing agent injection device (4), Benitration reactor exhaust pass (5), Benitration reactor inlet flue duct (6), fuel system controller (9), described fuel injection control system (2) is connected with described temperature control equipment (3) by fuel system controller (9).
The method of utilizing device that the utility model provides to carry out denitration, utilizes above-mentioned denitrification apparatus, and the interior temperature of described Benitration reactor (1) is 800-1100 ℃, is preferably 850-1050 ℃, more preferably 950-1050 ℃; Reducing agent in described injection of reducing agent injection device (4) is urea; The former flue gas that described in described Benitration reactor exhaust pass (5) clean flue gas out, Benitration reactor inlet flue duct (6) is come in; Described Benitration reactor exhaust pass (5) clean flue-gas temperature is out 900-1100 ℃; The former flue-gas temperature that described Benitration reactor inlet flue duct (6) is come in is 350-550 ℃.
Denitrification process:
Flue gas enters after Benitration reactor under the combustion of petroleum coke powder by continuous heating, heat sensor in temperature-rise period in temperature controller is connected with the increasing material shelves in fuel injection device, when temperature reaches 800-1100 ℃ of this reaction interval, heat sensor disconnects with increasing material shelves, change to reinforced at the uniform velocity shelves, if temperature surpasses this interval, just heat sensor is changed to material reducing shelves, object is to make temperature in reaction zone remain at this interval.Urea liquid is injected to be entered in Benitration reactor, is at high temperature decomposed into rapidly ammonia, ammonia optionally with high-temperature flue gas in nitrogen oxide react, generate nitrogen.Reacted flue gas enters heat exchanger heats import flue gas via exhaust pass, to improve input gas temperature, fuel saving.The flue gas of discharging from heat exchanger enters waste heat boiler and generates electricity.
Flue gas utilization denitrification apparatus of the present utility model is carried out to denitration, and its denitration rate can reach more than 90%, with respect to the denitration rate of existing denitration technology, has greatly improved.
Applicant's statement, the utility model illustrates detailed process equipment and process flow process of the present utility model by above-described embodiment, but the utility model is not limited to above-mentioned detailed process equipment and process flow process, do not mean that the utility model must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand; to any improvement of the present utility model; to the selection of the interpolation of the equivalence replacement of each raw material of the utility model product and auxiliary element, concrete mode etc., within all dropping on protection domain of the present utility model and open scope.

Claims (5)

1. a SNCR denitrification apparatus, comprise Benitration reactor (1), fuel injection control system (2), temperature control equipment (3), injection of reducing agent injection device (4), Benitration reactor exhaust pass (5), Benitration reactor inlet flue duct (6), fuel system controller (9), it is characterized in that:
Described fuel injection control system (2), temperature control equipment (3), injection of reducing agent injection device (4), Benitration reactor exhaust pass (5), Benitration reactor inlet flue duct (6) are installed in (1) on Benitration reactor; Described fuel injection control system (2) is connected with described temperature control equipment (3) by described fuel system controller (9).
2. device according to claim 1, is characterized in that, between described Benitration reactor exhaust pass (5) and described Benitration reactor inlet flue duct (6), heat exchanger (7) is set.
3. device according to claim 1 and 2, is characterized in that, described heat exchanger (7) connects Waste Heat Power Station (8).
4. device according to claim 1 and 2, it is characterized in that, described fuel injection control system (2) is connected with described temperature control equipment (3) by fuel system controller (9), between described Benitration reactor exhaust pass (5) and described Benitration reactor inlet flue duct (6), heat exchanger (7) is set, described heat exchanger (7) connects Waste Heat Power Station (8).
5. device according to claim 3, it is characterized in that, described fuel injection control system (2) is connected with described temperature control equipment (3) by fuel system controller (9), between described Benitration reactor exhaust pass (5) and described Benitration reactor inlet flue duct (6), heat exchanger (7) is set, described heat exchanger (7) connects Waste Heat Power Station (8).
CN201320396555.3U 2013-07-04 2013-07-04 SNCR (Selective Non Catalytic Reduction) denitration device Expired - Fee Related CN203447975U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103349898A (en) * 2013-07-04 2013-10-16 张蕊 SNCR (Selective Non-catalytic Reduction) denitration device and denitration method
CN104307347A (en) * 2014-10-30 2015-01-28 上海泰欣环保工程有限公司 Efficient SNCR point-to-point injection system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103349898A (en) * 2013-07-04 2013-10-16 张蕊 SNCR (Selective Non-catalytic Reduction) denitration device and denitration method
CN103349898B (en) * 2013-07-04 2016-06-08 张蕊 A kind of SNCR denitration device and method of denitration
CN104307347A (en) * 2014-10-30 2015-01-28 上海泰欣环保工程有限公司 Efficient SNCR point-to-point injection system

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Granted publication date: 20140226

Termination date: 20150704