CN205216547U - Flue gas denitration process systems - Google Patents

Flue gas denitration process systems Download PDF

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Publication number
CN205216547U
CN205216547U CN201520986907.XU CN201520986907U CN205216547U CN 205216547 U CN205216547 U CN 205216547U CN 201520986907 U CN201520986907 U CN 201520986907U CN 205216547 U CN205216547 U CN 205216547U
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flue
boiler furnace
pyrolysis oven
gas
denitration process
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顾安生
陆华
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KUNSHAN SANWEI HEAT EXCHANGER CO Ltd
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KUNSHAN SANWEI HEAT EXCHANGER CO Ltd
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Abstract

The utility model discloses a flue gas denitration process systems, it includes boiler furnace 1 and is located the outer pyrolysis oven of boiler furnace 2, SCR reactor 3, urea solution feed system 9, pipe -line system and furnace flue, wherein above -mentioned boiler furnace 1 is connected to pipe -line system's flue gas pipeline 41 one end, and the other end is connected pyrolysis oven 2, above -mentioned boiler furnace 1, other end intercommunication are connected to 42 one end of furnace flue the SCR reactor, urea solution feed system 9 is equipped with lug connection the urea solution pipeline 43 of pyrolysis oven 2. Utility model can provide a simple structure through setting up pyrolysis oven 2 and SCR reactor 3 in boiler furnace 1's the outside, maintains convenient flue gas denitration process systems to draw forth one high temperature flue gas entering pyrolysis oven 2 in boiler furnace, relative prior art, the utility model discloses the loss of ammonia has not only been reduced to a flue gas denitration process systems for moving safe and reliable, energy saving and consumption reduction is provided.

Description

A kind of flue-gas denitration process system
[technical field]
The utility model relates to a kind of flue-gas denitration process system of coal-burning power plant, particularly relates to a kind of flue-gas denitration process system of urea liquid pyrolysis.
[background technology]
Nitrogen oxide (NOx) in coal-fired plant flue gas is one of main atmosphere pollution, main incorporating selectively catalytic reduction technique (SCR) administers the discharge of the nitrogen oxide in flue gas at present, namely utilize reducing agent selectively with the reaction of nitrogen oxides in flue gas, and generate the nitrogen (N of nontoxic pollution-free 2) and water (H 2o), the object of denitration environmental protection is reached.The reducing agent that denitrating system is conventional has liquefied ammonia, ammoniacal liquor and urea liquid, select urea as reducing agent, have that security is high, wide material sources, be easy to the features such as transport and storage, be widely used at field of Environment Protection, its action principle is that urea liquid is become ammonia by pyrolysis installation pyrolysis, deliver in SCR reactor, then chemical reduction reaction occurs, realize the object of denitration environmental protection.
Refer to No. 201120063430.xth, the Chinese utility model patent in bulletin on December 7th, 2011, disclose a kind of boiler flue gas denitration system, comprise the amino substance solution preparation system be positioned at outside boiler, the amino substance solution be positioned at outside boiler be connected with described amino substance solution preparation system supplies and control device, and be positioned at the amino material solution jet group of boiler reversal chamber, described amino material solution jet group is supplied with described amino substance solution and is connected by amino material solution delivery line between control device, it is in the boiler reversal chamber of 300-700 DEG C that described amino material solution jet group is arranged in flue-gas temperature.Above-mentioned boiler flue gas denitration system, be directly sprayed in boiler by amino substance solution preparation system to decompose, generate ammonia, and enter in SCR reactor, such a structure increases the length of flow across of ammonia, loss ammonia, adds operating cost, and easily produces corrosion to the equipment that postorder flows through virtually, and injector group is directly placed in stove, once break down, must enter in stove and safeguard, bring more inconvenience.
Refer in bulletin No. 201010252649.4th, Chinese invention patent on July 4th, 2012 again, it discloses a kind of process for producing ammonia from urea and system thereof of denitration of boiler smoke, enter in pyrolysis oven after a hot blast is heated by boiler, but in this process equipment, need the process equipment that a kind of heating hot blast is additionally set, add the complexity of system and improve the cost of investment of denitrating technique.
Thus, the flue-gas denitration process system that a kind of technique of creationary design is simple, reduced investment, operating cost are low, maintenance is few is needed to carry out meeting the market requirement.
[utility model content]
For solving the problems of the technologies described above, the utility model provides a kind of structure simple and has energy-saving and cost-reducing flue-gas denitration process system.
The utility model is achieved through the following technical solutions: a kind of flue-gas denitration process system, comprises boiler furnace 1 and be positioned at pyrolysis oven 2, SCR reactor 3, urea liquid feed system 9, pipe-line system and the burner hearth flue 42 outside boiler furnace; Described pipe-line system comprises flue 41, and this flue 41 one end is communicated with above-mentioned boiler furnace 1, and the other end is communicated with described pyrolysis oven 2; Burner hearth flue 42 one end is communicated with above-mentioned boiler furnace 1, and the other end is communicated with described SCR reactor; Described urea liquid feed system 9 is provided with the urea pipeline 43 being communicated with described pyrolysis oven 2, and described pyrolysis oven 2 is provided with wind pipe 44, and is connected to described SCR reactor 3.
The utility model also realizes by following technical scheme: a kind of flue-gas denitration process system, comprises boiler furnace 1 and lays respectively at pyrolysis oven 2 outside boiler furnace, SCR reactor 3, urea liquid feed system 9, pipe-line system and connect the burner hearth flue 42 of boiler furnace and SCR reactor; This pipe-line system is provided with flue 41, and the high-temperature flue gas that this flue 41 is drawn higher than 450 DEG C from boiler furnace is transported to above-mentioned pyrolysis oven 2, and in described burner hearth flue supplied flue gases to above-mentioned SCR reactor 3; Described urea liquid feed system 9 is provided with urea liquid pipeline 43, injected by spraying urea liquid in described pyrolysis oven 2, and described pyrolysis oven is provided with wind pipe 44, and is connected to described SCR reactor 3.
The beneficial effects of the utility model are as follows: utility model is by being arranged on the outside of boiler furnace 1 by pyrolysis oven 2 and SCR reactor 3, a kind of structure can be provided simple, keep in repair flue-gas denitration process system easily, and direct high-temperature flue gas of drawing enters pyrolysis oven 2 in boiler furnace, after urea liquid is decomposed in pyrolysis oven, be transported to described SCR reactor 3 again, hinge structure, the utility model not only reduces the loss of ammonia, and provides a kind of safe and reliable to operation, small investment, energy-saving and cost-reducing flue-gas denitration process system.
[accompanying drawing explanation]
Fig. 1 is the schematic diagram of the utility model flue-gas denitration process system;
Fig. 2 is the schematic diagram of the utility model pressure charging system used.
[detailed description of the invention]
As shown in Figures 1 and 2, for a kind of flue-gas denitration process system that utility model relates to, it comprises boiler furnace 1, pyrolysis oven 2, SCR reactor 3, urea liquid feed system 9 and pipe-line system and burner hearth flue 42, in the present embodiment, this pipe-line system comprises flue 41 and is arranged on pressure charging system 5, dust pelletizing system 6, the quenching system 7 on flue.
Described boiler furnace 1 generates the equipment of high-temperature flue gas, is provided with superheater 11, reheater 12, economizer 13 and is positioned at the air preheater 14 of lower end in it; Wherein, flue 41 one end is communicated with at described boiler furnace 1, in present embodiment, flue 41 is reheater 12 places being connected to contiguous boiler furnace 1, or be interpreted as that flue 41 connects the region that boiler furnace place is the high-temperature flue gas that can extract more than 450 DEG C, and the other end is communicated to above-mentioned pyrolysis oven 2, thus, the high-temperature flue gas of this boiler furnace 1 is directly transported in described pyrolysis oven 2 through flue 41; Described burner hearth flue 42 one end is communicated with at described boiler furnace 1, in present embodiment, this burner hearth flue 42 is connected to contiguous economizer 13 region, the other end is communicated to described SCR reactor 3, delivered in above-mentioned SCR reactor 3 by boiler combustion flue gas and carry out denitration process, this pyrolysis oven 2 is connected by wind pipe 44 with SCR reactor 3.
Pressure charging system 5 on described flue 41, between boiler furnace 1 and pyrolysis oven 2, is greater than pressure in SCR reactor to make the high-temperature flue gas pressure extracted from boiler furnace 1.In the present embodiment, the injection source of the gas (not shown) that described pressure charging system 5 comprises injection booster pump 51 and is connected, this injection booster pump is provided with the nozzles with injector 52 being positioned at high-temperature flue gas pipeline and the smoke inlet 53 connected on flue 41, the entrance 54 of nozzles with injector is connected with injection source of the gas, the pressure of injection source of the gas is higher than high-temperature flue gas pressure, the gas flow of injection source of the gas forms high velocity air ejection after nozzles with injector 52, injection pressurization is played to high-temperature flue gas, thus makes boiler furnace high-temperature flue gas flow to pyrolysis oven 2 and SCR reactor 3 smoothly.This pressure charging system 5 is simple and reliable for structure, reliably can tolerate the high temperature of more than 450 DEG C for a long time.
Dust pelletizing system 6 on described flue 41, between pressure charging system 5 and boiler furnace 1, so that the flue gas of boiler furnace 1 is first done dust removal process, prevents flue dust blocking pipe or rear method, apparatus, also reduces flue dust simultaneously and enters loss to urea after pyrolysis oven 2.
In the present embodiment, described quenching system 7 is positioned at pressure charging system 5 rear, it has control valve 71, and this quenching system is communicated in flue 41, conveying cold air enters in flue 41, regulate the amount entering the cold wind of flue can carry out temperature adjustment to the high-temperature flue gas in conveying pyrolysis oven by control valve 71, prevent the flue gas of excessive temperature to be transferred in pyrolysis oven 2.Usually, quenching system by high-temperature flue gas temperature adjustment to urea pyrolysis temperature (being generally 450 DEG C to 600 DEG C), then can input in above-mentioned pyrolysis oven 2.
Described urea liquid feed system 9 is provided with urea liquid pipeline 43 and feed pump 90, is transported in described pyrolysis oven 2 by the urea liquid of urea liquid feed system 9 by feed pump 90 by urea liquid pipeline 43.
In the present embodiment, ammonia flow process processed is realized by following operation:
Introduce in described pyrolysis oven 2 by the high-temperature flue gas in described boiler furnace 1 by flue 41; Simultaneously, urea liquid in described urea liquid feed system 9 is transferred in described pyrolysis oven 2 by feed pump 90, after being atomized, and fully contacts with the high-temperature flue gas that flue 41 is sent into, decompose and generate ammonia, and carry in above-mentioned SCR reactor 3 by wind pipe 44; In addition, opening is introduced in described SCR reactor 3 at boiler furnace 1 lower end boiler furnace flue gas by burner hearth flue 42, with ammonia generation chemical reduction reaction, be commonly called as denitration, and reacted denitration flue gas enters in air preheater 14 via smoke discharge tube road 8, wherein, Simplified chemical reaction equation is as follows:
HNCO+H 2O→NH 3+CO 2
The utility model enters pyrolysis oven 2 by directly drawing one high-temperature flue gas from boiler furnace 1 as thermal source, is decomposed by the urea liquid passed in pyrolysis oven 2 and generates ammonia, then enter SCR reactor, realize denitrating flue gas.Hinge structure, the utility model not only reduces the loss of ammonia, and provide a kind of safe and reliable to operation, small investment, energy-saving and cost-reducing flue-gas denitration process system, and all boiler furnace high-temperature flue gas have all carried out denitration process, provide discharge cleanliness factor.In addition, the pressure charging system that the utility model is arranged adopts injection booster pump to improve high-temperature flue gas pressure, and hinge structure, has the ability of resistance to more than 450 DEG C temperature reliably and with long-term.

Claims (10)

1. a flue-gas denitration process system, is characterized in that: comprise boiler furnace (1) and be positioned at pyrolysis oven (2), SCR reactor (3), urea liquid feed system (9), pipe-line system and the burner hearth flue (42) outside boiler furnace; Described pipe-line system comprises flue (41), and this flue (41) one end is communicated with above-mentioned boiler furnace (1), and the other end is communicated with described pyrolysis oven (2); Burner hearth flue (42) one end is communicated with above-mentioned boiler furnace (1), and the other end is communicated with described SCR reactor; Described urea liquid feed system (9) is provided with the urea liquid pipeline (43) being communicated with described pyrolysis oven (2), described pyrolysis oven (2) is provided with wind pipe (44), and is connected to described SCR reactor (3).
2. flue-gas denitration process system as claimed in claim 1, it is characterized in that: described pipe-line system is provided with pressure charging system (5), this pressure charging system is positioned between boiler furnace (1) and pyrolysis oven (2), is delivered to pyrolysis oven (2) and SCR reactor (3) to make the high-temperature flue gas of drawing from boiler furnace (1).
3. flue-gas denitration process system as claimed in claim 2, it is characterized in that: described pressure charging system (5) comprises the injection booster pump that can tolerate more than 450 DEG C high temperature for a long time and the injection source of the gas be connected, and the pressure of described injection source of the gas is higher than high-temperature flue gas pressure.
4. flue-gas denitration process system as claimed in claim 3, it is characterized in that: described flue gas denitrification system is provided with the quenching system (7) being connected to described flue (41), this quenching system is provided with control valve (71), carries out temperature adjustment to urea pyrolysis temperature to regulate the amount entering flue cold wind to the high-temperature flue gas passed in pyrolysis oven.
5. flue-gas denitration process system as claimed in claim 4, it is characterized in that: described pipe-line system is provided with dust pelletizing system (6), is be positioned between pressure charging system (5) and boiler furnace (1).
6. flue-gas denitration process system as claimed in claim 1, it is characterized in that: described boiler furnace (1) is provided with reheater (12) and economizer (13), above-mentioned flue communication channel adds device region again contiguous boiler furnace, and above-mentioned burner hearth flue (42) is communicated with economizer (13) region at this boiler furnace contiguous.
7. a flue-gas denitration process system, is characterized in that: comprise boiler furnace (1) and lay respectively at pyrolysis oven (2) outside boiler furnace, SCR reactor (3), urea liquid feed system (9), pipe-line system and connect the burner hearth flue (42) of boiler furnace and SCR reactor; This pipe-line system is provided with flue (41), the high-temperature flue gas that this flue (41) is drawn higher than 450 DEG C from boiler furnace is transported to above-mentioned pyrolysis oven (2), and in described burner hearth flue conveying boiler smoke to above-mentioned SCR reactor (3); Described urea liquid feed system (9) is provided with urea liquid pipeline (43), spraying urea liquid is injected in described pyrolysis oven (2), and described pyrolysis oven is provided with wind pipe (44), and be connected to described SCR reactor (3).
8. flue-gas denitration process system as claimed in claim 7, it is characterized in that: described pipe-line system is provided with pressure charging system (5), it is positioned between boiler furnace (1) and pyrolysis oven (2), is delivered to pyrolysis oven and SCR reactor to make the high-temperature flue gas of drawing from boiler furnace (1).
9. flue-gas denitration process system as claimed in claim 8, it is characterized in that: described pressure charging system (5) comprises the injection booster pump that can tolerate more than 450 DEG C high temperature for a long time and the injection source of the gas be connected, and the pressure of described injection source of the gas is higher than high-temperature flue gas pressure.
10. flue-gas denitration process system as claimed in claim 7, it is characterized in that: described pipe-line system also comprises dust pelletizing system (6) and quenching system (7), described dust pelletizing system is located on flue, described quenching system is connected on described flue (41), this quenching system is provided with control valve (71), carries out temperature adjustment to urea pyrolysis temperature to regulate the amount of the cold wind entering flue to the high-temperature flue gas passed in pyrolysis oven.
CN201520986907.XU 2015-12-02 2015-12-02 Flue gas denitration process systems Active CN205216547U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106582234A (en) * 2016-10-20 2017-04-26 北京巴布科克·威尔科克斯有限公司 Boiler wide-load urea direct injection pyrolysis flue gas denitrification system
CN106807193A (en) * 2015-12-02 2017-06-09 昆山市三维换热器有限公司 A kind of flue-gas denitration process system
CN108731011A (en) * 2017-04-14 2018-11-02 昆山市三维换热器有限公司 Flue gas denitrification system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106807193A (en) * 2015-12-02 2017-06-09 昆山市三维换热器有限公司 A kind of flue-gas denitration process system
CN106582234A (en) * 2016-10-20 2017-04-26 北京巴布科克·威尔科克斯有限公司 Boiler wide-load urea direct injection pyrolysis flue gas denitrification system
CN108731011A (en) * 2017-04-14 2018-11-02 昆山市三维换热器有限公司 Flue gas denitrification system

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