CN207025089U - A kind of ammonia system processed that urea pyrolysis is directly realized using high temperature flue-gas from boiler - Google Patents

A kind of ammonia system processed that urea pyrolysis is directly realized using high temperature flue-gas from boiler Download PDF

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Publication number
CN207025089U
CN207025089U CN201721007665.0U CN201721007665U CN207025089U CN 207025089 U CN207025089 U CN 207025089U CN 201721007665 U CN201721007665 U CN 201721007665U CN 207025089 U CN207025089 U CN 207025089U
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flue gas
temperature flue
urea
boiler
temperature
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孟立新
周磊
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BEIJING BOHUITONG S&T DEVELOPMENT Co Ltd
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BEIJING BOHUITONG S&T DEVELOPMENT Co Ltd
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Abstract

The utility model gives a kind of ammonia system processed that urea pyrolysis is directly realized using high temperature flue-gas from boiler, and the system has at least one high-temperature flue gas bypass being connected between boiler tail reversal chamber and SCR inlet flue.The system directly realizes the pyrolytic reaction of urea liquid using the high-temperature flue gas of boiler, so that the flue gas containing ammonia of generation enters SCR inlet flue by the distribution pipe of high-temperature flue gas bypass outlet, and then enters SCR denitration system.Flue-gas temperature nearly reaches 100% no matter under any load of boiler suitable for urea pyrolysis, pyrolysis rate at one side boiler tail reversal chamber;On the other hand correspond to A sides and B side reactions device sets two-way high-temperature flue gas to bypass respectively, pyrolysis respectively can ensure that denitration efficiency, avoid excessive the escaping of ammonia in denitration control more precisely.More important is the pyrolysis that urea liquid is carried out using high-temperature flue gas, the conventional urea method for pyrolysis than routine saves substantial amounts of power consumption, reduces denitrification apparatus operating cost.

Description

A kind of ammonia system processed that urea pyrolysis is directly realized using high temperature flue-gas from boiler
Technical field
Denitration of boiler smoke technical field is the utility model is related to, relates more specifically to one kind and directly utilizes boiler high temperature cigarette Gas realizes the ammonia system processed of urea pyrolysis.
Background technology
In China, environmental protection and energy-conservation are constant themes, and the consumption of fossil fuel can also be reduced by effectively saving the energy So as to reduce noxious gas emission.As people are increasing to the attaching importance to environmental protection pressure of environment, national environmental protection index is increasingly Strictly.The concentration of nitrogen oxides and discharge capacity in boiler smoke is wherein controlled to reduce its pollution to air.Nitrogen oxides Control technology be divided into low nitrogen burning, fuel staging, flue gas reburning etc. control NO_x formation various technologies, the purpose is to Generate nitrogen oxides on source less as much as possible.But these means far can not reach ultra-clean emission request.For having generated Nitrogen oxides denitration technology mainly selective catalytic reduction method (SCR), SNCR method (SNCR) and Mixing method (SCR/SNCR).That be most widely used is selective catalytic reduction (SCR), and its denitration efficiency is high, the escaping of ammonia is few. SCR denitration system refers in the presence of catalyst, by spraying into reducing agent into flue gas, exists for conventional middle temperature catalyst Selective catalytic reduction reaction occurs with nitrogen oxides in effluent at a temperature of 300-420 DEG C, generates harmless nitrogen and water steams Vapour, so as to reach the purpose of abjection nitrogen oxides.In order to obtain the ammonia needed for SCR denitration, generally there are urea, liquefied ammonia and ammoniacal liquor Three kinds of reducing agents are available.Ammoniacal liquor safety requirements grade is relatively low, but because its concentration can only achieve 20% or so, freight Very high, storage facilities volume is larger, while ammoniacal liquor evaporation needs to consume substantial amounts of heat energy and electric energy, equipment initial outlay and operation Cost is higher;Liquefied ammonia technique is most simple, and initial outlay is few, but its safe class requires higher, in big and medium-sized cities by strict Limitation, much the denitrification apparatus of liquid ammonia process for caustic soda purification is changing or prepared to be changed to urea method at present.Urea stores because being required without safe class And the advantages that convenient transportation, is increasingly becoming the main reducing agent of SCR denitration.At present, using it is most be urea pyrolysis ammonia denitration System, generally can be divided into the outer urea pyrolysis ammonia denitrating system of conventional boiler and urea liquid direct-injection is pyrolyzed ammonia denitrating system processed, Wherein urea liquid direct-injection pyrolysis technique for production of ammonia is divided into urea liquid direct-injection pyrolysis technique for production of ammonia and the outer gas bypass of stove in stove again Urea liquid direct-injection is pyrolyzed two kinds of technique for production of ammonia, and urea liquid direct-injection is pyrolyzed technique for production of ammonia because it saves pyrolysis electric energy quilt in large quantities Promotion and application more and more.
The outer urea pyrolysis ammonia denitrating system of conventional boiler and method, including the solid particle urea storage dress being sequentially connected Put, urea solution preparing device, urea liquid storage device, urea liquid EGR metering and distributor, spray gun, and High temperature pressurised blower fan, electric heater and switch board, pyrolysis oven, the spray gun are arranged on pyrolysis oven, and described electric heater needs Boiler heat primary air is heated to 600 DEG C or so, it is necessary to which substantial amounts of electric energy, denitrification apparatus operating cost is very from 250~300 DEG C It is high.
Urea liquid direct-injection is pyrolyzed technique for production of ammonia in stove, also including urea storage device, urea solution preparing device, urea Solution storage device, the metering of urea liquid EGR and distributor, spray gun and boiler, the spray gun are arranged on the tail of boiler The heating surface region in portion, the nozzle of the spray gun is atomizer, and the nozzle is located at the inside of boiler;External device (ED) is by urea Solution is conveyed into spray gun, and the drop that atomization is translated into by spray gun sprays into boiler internal, recycles the high temperature cigarette of boiler internal Gas is pyrolyzed to form ammonia.But urea direct injection technology is that the urea liquid after dilution is sprayed into boiler tail by spray gun eventually Flue, urea back-end ductwork in boiler complete the process decomposed.Urea liquid after dilution has brought excessive water into boiler, Large effect boiler efficiency.And for the boiler of trailing space deficiency, if the also undecomposed completion of urea has just been sprayed onto pot On stove heating surface, the time has grown urea droplets can cause corrosion etc. to influence on heating surface.And above-mentioned technology does not have pervasive simultaneously Property, the reason is that many boilers because structure and cigarette tender feeling condition have very big difference, do not have in boiler suitable space or Person does not have suitable temperature range to use direct-injection urea technique for production of ammonia in boiler (such as afterbody double-flue boiler, tower-type furnace Deng), the boiler of these species can not use pot furnace injection urea technique for production of ammonia.
Chinese patent literature CN205133164U discloses a kind of system that urea pyrolysis ammonia is carried out using boiler bypass, The boiler bypass is arranged between low temperature superheater or low-temperature reheater and economizer, for urea pyrolysis flue-gas temperature compared with Low, pyrolytic reaction is not abundant enough.The urea liquid injection structure, is arranged in bypass flue, without special pyrolytic reaction Device, the very fast pyrolysis time of flue gas flow rate fall short of.In bypass flue in front of the urea liquid injection structure, bypass is provided with Flue regulating valve, to adjust the amount of the flue gas entered in bypass flue, electric shutting-door is not provided with, when bypass flue is adjusted Valve occurs to be unable to on-bne repair during high temperature bite.
The content of the invention
Therefore, the utility model try hard to overcome the urea direct injection technology universality of prior art it is poor can not it is all types of, The defects of being used under each working condition, and outside urea pyrolysis technology need to consume the defects of electric energy causes operating cost too high, So as to provide a kind of system that urea pyrolysis ammonia is carried out using boiler bypass.
The technical scheme that this is new to take is
A kind of ammonia system processed for directly realizing urea pyrolysis using high temperature flue-gas from boiler, have at least one to be connected to boiler High-temperature flue gas bypass between afterbody reversal chamber and SCR inlet flue;Every high-temperature flue gas bypass includes the high temperature being sequentially connected Gas bypass flue, urea pyrolysis reactor and distribution pipe, entrance and the boiler tail of the high-temperature flue gas bypass flue turn to Room is connected, and the urea pyrolysis reactor is connected by distribution pipe with SCR inlet flue.At one side boiler tail reversal chamber Flue-gas temperature nearly reaches 100% no matter under any load of boiler suitable for urea pyrolysis, pyrolysis rate;On the other hand set A plurality of high-temperature flue gas bypass is put, pyrolysis respectively can ensure that denitration efficiency, avoid excessive in denitration control more precisely The escaping of ammonia.
Further, also there is flying dust baffle plate in the high-temperature flue gas bypass flue, enter to stop by high-temperature flue gas The dust on road;And/or high-temperature flue gas by-pass switch door;And/or high-temperature flue gas bypass regulation door, enter high-temperature flue gas to adjust The amount of flue gas in bypass.
Further, the thermal reactor has urea liquid spray gun assembly, and spray gun assembly is by from urea liquid source Urea liquid is injected into urea pyrolysis reactor.
Further, it is provided with metered dispensing unit between spray gun assembly and the urea liquid source.
Further, demand modeling urea liquid flow of the metered dispensing unit response SCR reactors to reducing agent Distribute to every spray gun.
Further, the urea pyrolysis reactor entrance is provided with deflector.
Further, the bypass of described high-temperature flue gas is in the enclosure wall tube and urea close to reversal chamber side wall and/or rear wall Expansion joint is provided with the flue of pyrolysis reactor outlet.
Further, described high-temperature flue gas bypass is provided with multiple distribution pipes being connected with SCR inlet flue.
Further, the high-temperature flue gas bypass inlet is arranged on the side wall and/or rear wall of the boiler flue.Connection It is bend pipe perforate mode or venetian blind type to locate open-cellular form;The rectangular cross-section of the high-temperature flue gas bypass flue or circle.
Further, the appropriate location in SCR inlet flue sets static mixer.
Further, the above-mentioned system that urea pyrolysis ammonia is carried out using boiler bypass, the flying dust baffle plate setting is in institute On the internal face for stating high-temperature flue gas bypass, and it is obliquely installed along the flow of flue gas direction in high-temperature flue gas bypass, it is described to fly The internal face shape of the coupled high-temperature flue gas bypass of grey baffle plate is in an acute angle.
Technical scheme, have the following advantages that:
1. the ammonia system processed that urea pyrolysis is carried out using boiler bypass of a new offer, on the one hand avoids urea direct-injection Urea droplets can cause the influence of corrosion to heating surface in technology, on the other hand be urinated using the high-temperature flue gas of afterbody reversal chamber Element pyrolysis, not only without the consumption of pyrolysis electric energy, the operating cost of denitrating flue gas is reduced, and be pyrolyzed efficiency high, adapt to pot The wide load operating conditions of stove.
2. the ammonia system processed that urea pyrolysis is carried out using boiler bypass of a new offer, can be according to boiler operatiopn load Influence, regulation enter high-temperature flue gas bypass in flue gas amount, it is ensured that the pyrolytic process of urea, enter flue so as to ensure that Ammonia amount, it is ensured that the stable operation of technique.Avoid when boiler at low load is run, SCR denitration entrance flue gas temperature The minimum spray ammonia temperature that system allows will be less than, catalyst will not play its due work when less than minimum operating temperature With the phenomenon of forced outage occurs in boiler at low load for flue gas denitrification system.
3. the ammonia system processed that urea pyrolysis is carried out using boiler bypass of a new offer, the bypass of its high-temperature flue gas is close to it The position of outlet is additionally provided with expansion joint, alleviates high-temperature flue gas and bypasses the thermal expansion under temperature change.
4. the ammonia system processed that urea pyrolysis is carried out using boiler bypass of a new offer, urea liquid injection structure can be with Using common spray gun, for example, single spray gun, carries out the injection of urea liquid, you can realize urea liquid in high-temperature flue gas Covering in bypass, so as to be not required the spray for the labyrinth that there is specific function using the long spray gun of multiinjector or other structures Rifle, due to not limited by spray gun structure, its not only simple installation, but also the cost that can reduce investment outlay, reduce operation troubles.
5. the ammonia system processed that urea pyrolysis is carried out using boiler bypass of a new offer, uses the high temperature cigarette of one or more Gas bypasses, and pyrolysis can ensure that denitration efficiency, avoid excessive ammonia in denitration control more precisely respectively for each bar bypass Escape, while overhaul, safeguard, change it is also ensured that carrying out ammonia system processed under conditions of not stopping transport.Will not be because of ammonia system processed Failure causes to hinder to boiler operatiopn.
Brief description of the drawings
Fig. 1 is the schematic diagram of the utility model ammonia system.
Wherein, reference is:1- boiler reversal chambers, 2- low temperature superheaters, 3- high/low temperature economizers, 4- high-temperature flue gas Bypass flue, 5- expansion joints, 6- high-temperature flue gas bypass automatic door, 7- high-temperature flue gas bypass electric adjustable section door, 8- deflectors, 9- urea liquid spray gun assemblies, 10- metered dispensing units, 11- urea pyrolysis reactors, 12- outlets distribution tube assembly, 13- are quiet State blender
Embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described implementation Example is the description to this new objective, must not be considered the concrete restriction of this novel protected scope.It should be understood that it is any The adjustment made specifically is set to fall within this new protection domain high-temperature flue gas bypass in this new teachings.
, it is necessary to the orientation or position relationship of the instruction such as explanation, term " front " " rear " in this new description Based on orientation shown in the drawings or position relationship, to be for only for ease of description, this is new and simplify description, rather than instruction or Imply that signified device or element there must be specific orientation, with specific azimuth configuration and operation, therefore it is not intended that The limitation new to this.In addition, as long as technical characteristic involved in invention described below different embodiments is each other Between do not form conflict can be combined with each other.
As shown in figure 1, a kind of ammonia system processed that urea pyrolysis is carried out using boiler bypass, including the flowing along boiler smoke Direction, the low temperature superheater 2 and economizer 3 being arranged on boiler flue;Also include, high-temperature flue gas bypass, positioned at boiler exterior, It is connected on the boiler flue of the afterbody reversal chamber, the entrance of high-temperature flue gas bypass flue 4 is arranged on the front of low temperature superheater 2 Boiler reversal chamber 1 at, no matter flue-gas temperature is applied to urea pyrolysis under any load of boiler at boiler reversal chamber 1, and Pyrolysis rate nearly reaches 100%, can so ensure the equal energy of urea pyrolysis reactor in high-temperature flue gas bypass under various loads Efficient operation, the outlet of the high-temperature flue gas bypass are connected with the flue at the rear of economizer 3;Urea liquid injection structure 9, if Put in high-temperature flue gas bypass, to spray urea liquid into urea pyrolysis reactor 11, and with the urea liquid meter of outside Amount distributor 10 is connected.Urea liquid injection structure 9 is urea liquid spray gun in the present embodiment, in other embodiment In, can be other urea liquid injection structures, as long as its corresponding function can be realized, according to boiler operating state Need, the position of the low temperature superheater 2, which can also substitute, is arranged to low-temperature reheater.
On the basis of above-mentioned embodiment, the flow direction of flue gas, the urea are molten along high-temperature flue gas bypass In high-temperature flue gas bypass in front of liquid injection structure, high-temperature flue gas bypass valve 7 is provided with, enters high-temperature flue gas to adjust The amount of flue gas in bypass.During boiler heavy-duty service, high-temperature flue gas bypass valve is adjusted, a small amount of flue gas is entered high temperature Gas bypass, this partial fume are only used for urea solution vaporization and decomposition.When boiler at low load is run, regulation high-temperature flue gas bypass Regulating valve 7, partial fume is set to be bypassed into high-temperature flue gas, this partial fume is applied not only to the vaporization and decomposition of urea liquid, also The temperature of SCR inlet can be increased, SCR inlet temperature is more than the minimum spray ammonia temperature of catalyst, SCR inlet when avoiding underload SCR denitration system stoppage in transit problem caused by place's flue-gas temperature is too low.
On the basis of above-mentioned embodiment, flying dust baffle plate is additionally provided with the high-temperature flue gas bypass inlet, to hinder Gear enters the dust of high-temperature flue gas bypass.The flying dust baffle plate setting is on the internal face that the high-temperature flue gas bypasses, and along institute The flow of flue gas direction stated in high-temperature flue gas bypass is obliquely installed, the flying dust baffle plate and the coupled high-temperature flue gas The internal face shape of bypass is in an acute angle.
On the basis of above-mentioned embodiment, the high-temperature flue gas bypass is additionally provided with expansion close to the position of its outlet Section.The expansion of the pipeline caused by temperature is expanded with heat and contract with cold is avoided to high-temperature flue gas bypass and the influence of enclosure wall tube.
On the basis of above-mentioned embodiment, the high-temperature flue gas bypass is provided with the one or more and boiler flue The high-temperature flue gas bypass inlet being connected, so each gas bypass can part/all put into operation, on the one hand can accurately control de- Nitre process, certain a part of or a certain bar high-temperature flue gas bypass failure of another aspect do not interfere with boiler overall operation and its denitration Demand, maintenance, maintenance high-temperature flue gas need not also shut down blowing out when bypassing, it is only necessary to disconnect corresponding high-temperature flue gas bypass and tieed up Repair, overhaul.
On the basis of above-mentioned embodiment, the high-temperature flue gas bypass inlet be arranged on the boiler flue side wall and / or rear wall on.
On the basis of above-mentioned embodiment, the section of the high-temperature flue gas bypass is circular or rectangle.
Operation principle of the present utility model is that the high-temperature flue gas in boiler flows along boiler flue, in afterbody reversal chamber one Part high-temperature flue gas is bypassed by high-temperature flue gas bypass inlet into high-temperature flue gas, and most of high-temperature flue gas is through low temperature superheater or low Warm reheater, economizer enter rear flue, and rear flue negative pressure provides power for the flowing of flue gas in high-temperature flue gas bypass;With This simultaneously, urea liquid injection structure 9 to high-temperature flue gas bypass in urea pyrolysis reactor constantly spray into urea liquid, pass through It is ammonia that the high-temperature flue gas of high temperature gas bypass, which is crossed, by urea liquid pyrolysis, and in the case where air-flow promotes, is bypassed out by high-temperature flue gas Mouthful discharge flows into the rear denitration gas approach of economizer, is provided for follow-up SCR denitrating techniques or other denitrating techniques required Ammonia.To reduce the amount of dust for entering high-temperature flue gas bypass, flying dust baffle plate is set in high-temperature flue gas bypass inlet, entered for regulation The amount of the flue gas of high-temperature flue gas bypass, high-temperature flue gas bypass valve is provided with high-temperature flue gas bypass
Obviously, above-described embodiment is only intended to clearly illustrate example, and is not the restriction to embodiment.It is right For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or Among changing still in the protection domain of the invention.

Claims (10)

1. a kind of ammonia system processed for directly realizing urea pyrolysis using high temperature flue-gas from boiler, have at least one to be connected to boiler tail High-temperature flue gas bypass between portion's reversal chamber and SCR inlet flue;Every high-temperature flue gas bypass includes the high temperature cigarette being sequentially connected Gas bypass flue, urea pyrolysis reactor and distribution pipe, entrance and the boiler tail reversal chamber of the high-temperature flue gas bypass flue Connection, the urea pyrolysis reactor are connected by distribution pipe with SCR inlet flue.
2. ammonia system processed according to claim 1, it is characterised in that also there is flying dust in the high-temperature flue gas bypass flue Baffle plate and/or high-temperature flue gas by-pass switch door and/or high-temperature flue gas bypass regulation door.
3. ammonia system processed according to claim 1 or 2, it is characterised in that the urea thermal reactor has urea liquid Urea liquid from urea liquid source is injected into thermal reactor by spray gun assembly, spray gun assembly.
4. ammonia system processed according to claim 3, it is characterised in that set between spray gun assembly and the urea liquid source There is metered dispensing unit.
5. ammonia system processed according to claim 4, it is characterised in that the metered dispensing unit responds SCR reactors pair The demand modeling urea liquid flow of reducing agent is simultaneously distributed to every spray gun.
6. ammonia system processed according to claim 3, it is characterised in that the urea pyrolysis reactor entrance is provided with water conservancy diversion Plate.
7. ammonia system processed according to claim 3, it is characterised in that described high-temperature flue gas bypass is close to reversal chamber side Expansion joint is provided with wall and/or the flue of rear wall enclosure wall tube and urea pyrolysis reactor outlet.
8. ammonia system processed according to claim 3, it is characterised in that described high-temperature flue gas bypass be provided with it is multiple with The distribution pipe that SCR inlet flue is connected.
9. ammonia system processed according to claim 3, the high-temperature flue gas bypass be connected to boiler tail reversal chamber side wall and/ Or rear wall, junction open-cellular form are bend pipe perforate mode or venetian blind type;The section of the high-temperature flue gas bypass flue is square Shape or circle.
10. ammonia system processed according to claim 3, it is characterised in that the appropriate location in SCR inlet flue sets static Blender.
CN201721007665.0U 2017-08-08 2017-08-08 A kind of ammonia system processed that urea pyrolysis is directly realized using high temperature flue-gas from boiler Active CN207025089U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110145732A (en) * 2019-05-13 2019-08-20 哈尔滨锅炉厂有限责任公司 Large coal powder boiler ultra-low load economizer switches bypath system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110145732A (en) * 2019-05-13 2019-08-20 哈尔滨锅炉厂有限责任公司 Large coal powder boiler ultra-low load economizer switches bypath system

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