CN202087235U - Multi-level thermolysis coupling denitrification device with pre-flow field equalizing device - Google Patents

Multi-level thermolysis coupling denitrification device with pre-flow field equalizing device Download PDF

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Publication number
CN202087235U
CN202087235U CN2011200844191U CN201120084419U CN202087235U CN 202087235 U CN202087235 U CN 202087235U CN 2011200844191 U CN2011200844191 U CN 2011200844191U CN 201120084419 U CN201120084419 U CN 201120084419U CN 202087235 U CN202087235 U CN 202087235U
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China
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reducing agent
boiler
spray gun
flow field
ammonia spray
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Expired - Fee Related
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CN2011200844191U
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Chinese (zh)
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周昊
岑可法
胡善涛
陈丰
殷红
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The utility model discloses a multi-level thermolysis coupling denitrification device with a pre-flow field equalizing device. The uniformity of NOx in a hearth section is optimized by installation of the pre-flow field equalizing device; reducing nitrogen supply spray guns of different shapes and different numbers are arranged in different positions with different fume temperatures of a boiler fume passage, to control corresponding uniform distributions of NOx and NH3; and an SCR (selective catalytic reduction) reactor with an SCR catalyst is mounted to a boiler tail flue. The overall denitrification efficiency of the device reaches more than 90%, the consumption of the SCR catalyst is reduced, the utilization efficiency of the reducing agent in the selective non-catalytic reduction region is increased to reduce the consumption of the reducing agent and thus to effectively control ammonia escape. The multi-level thermolysis coupling denitrification device with the pre-flow field equalizing device is easily modified in the existing boiler denitrification process, is suitable for different types of boilers and industrial kilns, and has broad application prospects.

Description

A kind of multistage pyrolysis coupling denitrification apparatus with preposition even flow field device
Technical field
The utility model relates to coal-burning boiler pollutant emission control device, relates in particular to a kind of multistage pyrolysis coupling denitrification apparatus with preposition even flow field device.
Background technology
Nitrogen oxide NOx comprises N 2O, NO, NO 2, N 2O 3, N 2O 4And N 2O 5, be considered to one of primary pollution source that causes atmosphere pollution.Wherein NO and NO 2Be important atmosphere pollution, the nitrogen oxide that produces in the burning almost is NO and NO entirely 2The 70% direct burning that comes from coal in China's discharged nitrous oxides total amount, and power industry is the coal-fired rich and influential family of China, so the main emission source of NOx is the thermal power plant.The environmental regulation of increasingly stringent requires NOx emission source especially station boiler is used the NOx discharge-reducing method, with the total emission volumn of control nitrogen oxide.Existing coal fired power plant nitrogen oxide discharge-reducing method mainly is control and burning back denitrating flue gas two big methods in the burning.The NOx control method mainly is by changing the discharging that burner structure and burning condition reduce NOx in the combustion process, is most widely used general, economy and effective method, can unite use with other method of denitration.The denitration method for flue gas that is applied on the coal-burning boiler mainly contains selective non-catalytic reduction method (SNCR) and selective catalytic reduction method (SCR).SNCR method system is simple, construction is simple, initial investment is low, operating cost is little, but its maximum defective is that the denitration rate is lower, 30 ~ 50% denitration rate is only arranged on coal burning boiler of power station, and its escaping of ammonia of SNCR method be difficult to control, influence the stability and the security of boiler operatiopn.SCR method denitration efficiency height, can well realize the even mixing of NO in reducing agent and the flue gas owing to adopt blender, ammonia-spraying grid and flue gas rectifier, the denitration rate can reach more than 95%, but that its shortcoming is a floor space is big, system complex, initial investment is big, operating cost is high.On coal-burning boiler, also have to adopt and mix SNCR-SCR denitration technology, but be difficult to realize the even mixing of NO in reducing agent and the flue gas, so the denitration rate of SNCR-SCR method is difficult to satisfactory.
The utility model content
The purpose of this utility model provides a kind of multistage pyrolysis coupling denitrification apparatus with preposition even flow field device.
For achieving the above object, technical solution adopted in the utility model is: its multistage pyrolysis coupling denitrification apparatus with preposition even flow field device is to be provided with preposition even flow field device on boiler furnace, stationary cloth is equipped with the above reducing agent of one deck and mends the ammonia spray gun on the boiler front wall, in boiler horizontal gas pass, be furnished with the above reducing agent of one deck and mend the ammonia spray gun, be loaded with the SCR reactor of SCR catalyst in the fixed installation of boiler back end ductwork place.
Further, boiler front wall described in the utility model is used to arrange that it is 750~950 ℃ that reducing agent is mended the flue-gas temperature of the position of ammonia spray gun, and described boiler horizontal gas pass is used to arrange that it is 650~800 ℃ that reducing agent is mended the flue-gas temperature of the position of ammonia spray gun.
Further, but preposition even flow field device described in the utility model is the swing type air port of being located on the boiler furnace.
The advantage that the utility model is had compared with the prior art is as follows:
(1) the utility model has adopted preposition even flow field device, especially, if preposition even flow field device is the swung air port of being located on the boiler furnace, then can change and regulate NOx and velocity of flue gas, the distribution of temperature in burner hearth by the airflow direction that comes out of control air port, under the prerequisite of limited benefit ammonia spray gun quantity, satisfy of the requirement of SCR system to flue gas and reducing agent mixing uniformity;
(2) the utility model is by being that the above reducing agent of fixed and arranged one deck is mended the ammonia spray gun on 750~950 ℃ the boiler front wall in the flue-gas temperature scope reasonably, and in being 650~800 ℃ boiler horizontal gas pass, the flue-gas temperature scope arranges that the above reducing agent of one deck mends the ammonia spray gun, the reducing agent of installing at the diverse location place with different flue-gas temperatures is mended the ammonia spray gun and has been taked different version, and every lance ejection reducing agent flow can be regulated separately, arrange the SCR reactor behind the back-end ductwork, improved the utilization rate of the reducing agent generation SNCR reaction that sprays in the burner hearth, and can make the NH that generates after the reducing agent pyrolysis 3Be corresponding better with NO and evenly distribute, the selective catalytic reduction reaction that takes place for the inherent SCR catalyst surface of the SCR reactor in downstream provides very favourable factor;
(3) the utility model is mended ammonia spray gun pyrolysis system by adopting, and rationally utilizes boiler flue, need not the restriction in space, and equipment is simple, has saved the reductant injection system of SCR system complex;
(4) reducing agent benefit ammonia spray gun sprays into reducing agent in the stove, the reaction of partial reduction agent generation SNCR, tentatively reduced the NO that enters the SCR reactor in the flue gas, so the SCR reactor only need be arranged one deck catalyst, greatly reduce the operating cost of SCR system, saved the occupation of land space of SCR system, be easy on existing boiler denitration engineering foundation, transform the utility model as;
(5) the comprehensive denitration rate of the utility model method reaches more than 90%, and operating cost is lower than existing pure SCR method of denitration, is applicable to various boilers of combustion and stove, has broad application prospects.
Description of drawings
Fig. 1 is a principle schematic of the present utility model;
Fig. 2 is for being provided with the structural representation that reducing agent is mended the ammonia spray gun at the boiler front wall;
Fig. 3 is the swing air port schematic diagram of the preposition even flow field device of the utility model, and wherein α is adjustable angle of oscillation.
The specific embodiment
Below in conjunction with instantiation the multistage pyrolysis coupling method of denitration that the utlity model has preposition even flow field device is described in further detail with reference to the accompanying drawings.
As shown in Figure 1 to Figure 3, in the multistage pyrolysis coupling denitrification apparatus of utility model, on boiler furnace, be provided with preposition even flow field device, stationary cloth is equipped with the above reducing agent of one deck and mends ammonia spray gun 3 on the boiler front wall, in boiler horizontal gas pass, be furnished with the above reducing agent of one deck and mend the ammonia spray gun, be loaded with the SCR reactor of SCR catalyst in the fixed installation of boiler back end ductwork place.As preferred version of the present utility model, but preposition even flow field device is the swing type air port of being located on the boiler furnace.Especially, the flue-gas temperature that preferred reducing agent benefit ammonia spray gun 3 is arranged in the boiler front wall is 750~950 ℃ position, and the flue-gas temperature that reducing agent benefit ammonia spray gun 4 is arranged in boiler horizontal gas pass is 650~800 ℃ position.
As shown in Figure 3, as a kind of simple preferred implementation of the present utility model, when preposition even flow field device 2 is when being located at the swing type air port 21 of boiler furnace, can be by adjusting to swing type air port 21 angles, the put into operation reducing agent of different layers of selection is mended the ammonia spray gun, and every lance ejection reducing agent flow controlled separately, realize the even mixing of NO in reducing agent and the flue gas effectively, satisfy the requirement of under the coal-burning boiler different load NOx being controlled, reliable and stable, the efficient height.The utility model is transferred the angle of oscillation adjustment wind by the emitted dose of every spray gun reducing agent of independent adjusting and the spray gun type that takes various forms, and promotes and improved NH in the flue gas 3With the degree that mixes of NO, the NH that the NO CONCENTRATION DISTRIBUTION inequality that has rotating deviation to cause for the elimination furnace outlet causes 3Mix the inhomogeneous significant effect that has with it.
Specifically, as depicted in figs. 1 and 2, on the burner hearth 1 of boiler, be provided with preposition even flow field device 2.If be provided with as shown in Figure 3 on the preposition even flow field device four can left and right swing swing type air port 21, thereby the direction of the air-flow that the air port comes out is changed regulate NOx and velocity of flue gas, the distribution of temperature in burner hearth.The top of burner hearth 1 is installed with that reducing agent is mended ammonia spray gun 3 and reducing agent is mended ammonia spray gun 4: wherein, reducing agent mend ammonia spray gun 3 individual layers totally 5 fixedly be arranged in the boiler front wall, generally adopt the porous type spray gun; Reducing agent is mended between the high temperature superheater and high temperature reheater of ammonia spray gun 4 fixed and arranged in the upper furnace horizontal flue, divides two-layer totally 4 spray gun left and right sides side wall symmetric arrangement, generally adopts V-type mouth spray gun.Wherein, the flue-gas temperature that reducing agent benefit ammonia spray gun 3 is arranged in the boiler front wall is 750~950 ℃ position, and the flue-gas temperature that reducing agent benefit ammonia spray gun 4 is arranged in boiler horizontal gas pass is 650~800 ℃ position.In the utility model, ammonia spray gun 3 mended by reducing agent and reducing agent benefit ammonia spray gun 4 can be arranged to one or more layers.In addition, fixedly mount the SCR reactor 9 that is loaded with the SCR catalyst at the boiler back end ductwork place, described reducing agent is for containing ammonia liquid.
When using the utility model device to carry out denitration, according to the payload of boiler and the flue-gas temperature of reducing agent benefit ammonia spray gun, determine that selecting to use the reducing agent benefit ammonia spray gun 3 on the boiler front wall still is that the interior reducing agent of horizontal flue is mended ammonia spray gun 4, to spray in the burner hearth 1 after the reducing agent atomizing, make the part spray in the reducing agent in the burner hearth 1 the SNCR reaction take place, and the remainder pyrolysis that sprays into the interior reducing agent of burner hearth 1 become ammonia with the NO in the flue gas; Flue gas in ammonia and the burner hearth is mixing to back-end ductwork and flows and mix gradually subsequently.When the flue gas that is mixed with ammonia was flowed through SCR reactor 9, the NO in the flue gas was reduced to N behind SCR catalyst surface and ammonia generation selective catalytic reduction reaction 2
Below further illustrate:
The 420t/h coal-burning boiler generates 450mg/Nm through low nitrogen burning in the burner hearth under 60~110MW load 3About NOx, and along with flue gas upwards flows.The angle of being located at the swing type air port 21 in the boiler furnace by adjustment is to optimize NOx distribution on the cross section 14 in burner hearth.As shown in Figure 2, respectively mend the manual ball valve 19 of ammonia spray gun by fine setting, observe the reading of suspended body flowmeter 20, regulate reducing agent 18 by mending the flow of ammonia spray gun, keeping the show value of atomizing compressed air 16 on Pressure gauge 15 on the spot is more than the 0.55MPa, keep simultaneously reducing agent on the spot the numerical value of Pressure gauge 17 more than 0.55MPa, make NOx concentration and decompose the NH of coming out 3Concentration is corresponding even distribution.Need to prove,, can also use superheated steam atomizing reducing agent except using compressed air with the reducing agent atomizing.The temperature range of mending absolute altitude place, ammonia spray gun 3 position flue gas at reducing agent is 780~900 ℃, and the flue-gas temperature scope that reducing agent is mended absolute altitude place, ammonia spray gun 4 position is 620~690 ℃.Load based on coal-burning boiler in the present embodiment is 60 ~ 110MW, and the reducing agent that can put into operation this moment is mended ammonia spray gun 3, and the reducing agent that do not put into operation is mended ammonia spray gun 4.It is 10% urea liquid that reducing agent preferably adopts concentration, and (by whole pyrolysis is NH to the straying quatity of reducing agent 3Calculate) with NO mol ratio in the flue gas be 1.0~1.8:1, mend ammonia spray gun 3 by the reducing agent of front wall and spray into burner hearth, the SNCR reaction takes place in partial reduction agent wherein and the NO in the flue gas, after this non-catalytic reduction reaction, the concentration of NOx can reduce about 37%, reaches 280 mg/Nm 3About; All the other reducing agent pyrolysis are NH 3, the NH in the flue gas 3Be about about 118ppm, contain NH 3Flue gas through various heat exchange face, back-end ductwork, turn to flue, deflector 5, SCR catalyst top rectifier 6, make NH 3Fully mix with the NO in the flue gas, make the NO in the flue gas be reduced to N thereby selective catalytic reduction reaction takes place on SCR catalyst 7 surfaces 2Flue gas in ammonia and the burner hearth is generally more than 3 seconds from beginning to be mixed to the time that arrives SCR reactor 9.SCR reactor 9 residing flue-gas temperature scopes are 289~307 ℃, and the bottom of SCR reactor 9 is that catalyst is reserved layer 8.Behind SCR reactor 9, the NOx concentration in the flue gas is reduced to 50 mg/Nm 3About, the average the escaping of ammonia concentration of system is controlled at below the 3ppm.Flue gas after denitration enters in the atmosphere through chimney 13 through air preheater 10, deduster 11, desulfurizer 12 again.
The 420t/h coal-burning boiler generates 440mg/Nm through low nitrogen burning in the burner hearth under 120~125MW load 3About NOx, and along with flue gas upwards flows.The angle of being located at the swing type wind 21 of boiler furnace by adjustment makes the distribution of NOx in burner hearth cooperate reducing agent to mend the independent Flow-rate adjustment of ammonia spray gun, makes NOx concentration and decomposes the NH of coming out 3Concentration is corresponding even distribution.The temperature range of mending absolute altitude place, ammonia spray gun 3 position flue gas at reducing agent is 840~970 ℃, and the flue-gas temperature scope that reducing agent is mended absolute altitude place, ammonia spray gun 4 position is 704~740 ℃.Can putting into operation separately this moment, reducing agent is mended ammonia spray gun 4 or the reducing agent that puts into operation is simultaneously mended ammonia spray gun 3 and 4.Reducing agent employing concentration is 10% urea liquid, and (by whole pyrolysis is NH to the straying quatity of reducing agent 3Calculate) with NO mol ratio in the flue gas be 1.0~1.8:1, mend ammonia spray gun 4 or spray into burner hearth jointly by the reducing agent in the horizontal flue by the reducing agent benefit ammonia spray gun 3 of boiler front wall and the reducing agent 4 in the horizontal flue, wherein, the non-recall reduction of selectivity takes place in the NO in partial reduction agent and the flue gas, after this non-catalytic reduction reaction, the concentration of NOx can reduce about 39%, reaches 270 mg/Nm 3About; All the other reducing agent pyrolysis are NH 3, the NH in the flue gas 3Be about about 120ppm, contain NH 3Flue gas through various heat exchange face, back-end ductwork, turn to flue, deflector 4, SCR catalyst top rectifier 5, make NH 3Fully mix with the NO in the flue gas, make the NO in the flue gas be reduced to N thereby selective catalytic reduction reaction takes place on SCR catalyst 6 surfaces 2Flue gas in ammonia and the burner hearth is generally more than 3 seconds from beginning to be mixed to the time that arrives SCR reactor 9.SCR reactor 9 residing flue-gas temperature scopes are 304~314 ℃, and behind SCR reactor 9, the NOx concentration in the flue gas is reduced to 35mg/Nm 3About, the average the escaping of ammonia concentration of system is controlled at below the 3ppm.
After the utility model method is applied to reality, not only can effectively reduce the discharged nitrous oxides of coal-burning boiler, efficient reaches more than 90%, and is easy to operate and control, can low-cost carry out removing of high efficiency NOx, with the requirement of the environmental regulation that satisfies increasingly stringent.

Claims (3)

1. multistage pyrolysis coupling denitrification apparatus with preposition even flow field device, it is characterized in that: on boiler furnace, be provided with preposition even flow field device, stationary cloth is equipped with the above reducing agent of one deck and mends the ammonia spray gun on the boiler front wall, in boiler horizontal gas pass, be furnished with the above reducing agent of one deck and mend the ammonia spray gun, be loaded with the SCR reactor of SCR catalyst in the fixed installation of boiler back end ductwork place.
2. multistage pyrolysis coupling denitrification apparatus according to claim 1, it is characterized in that: in the flue-gas temperature of described boiler front wall is that 750~950 ℃ position arranges that described reducing agent mends the ammonia spray gun, is that 650~800 ℃ position arranges that described reducing agent mends the ammonia spray gun in the flue-gas temperature of described boiler horizontal gas pass.
3. multistage pyrolysis coupling denitrification apparatus according to claim 1 and 2 is characterized in that: but described preposition even flow field device is the swing type air port of being located on the boiler furnace.
CN2011200844191U 2011-03-28 2011-03-28 Multi-level thermolysis coupling denitrification device with pre-flow field equalizing device Expired - Fee Related CN202087235U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102179171A (en) * 2011-03-28 2011-09-14 浙江大学 Multi-stage themolysis coupled denitration method using front flow field uniformizing device and device thereof
CN103007707A (en) * 2012-12-19 2013-04-03 清华大学 Combined SNCR-SCR system used for industrial boiler and having high load adaptability, and SNCR-SCR combination method thereof
CN110618706A (en) * 2019-09-27 2019-12-27 中国大唐集团科学技术研究院有限公司华中电力试验研究院 Multistage intelligent denitration online optimization control system based on data driving

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102179171A (en) * 2011-03-28 2011-09-14 浙江大学 Multi-stage themolysis coupled denitration method using front flow field uniformizing device and device thereof
CN103007707A (en) * 2012-12-19 2013-04-03 清华大学 Combined SNCR-SCR system used for industrial boiler and having high load adaptability, and SNCR-SCR combination method thereof
CN103007707B (en) * 2012-12-19 2015-01-21 清华大学 Combined SNCR-SCR system used for industrial boiler and having high load adaptability, and SNCR-SCR combination method thereof
CN110618706A (en) * 2019-09-27 2019-12-27 中国大唐集团科学技术研究院有限公司华中电力试验研究院 Multistage intelligent denitration online optimization control system based on data driving
CN110618706B (en) * 2019-09-27 2023-05-12 中国大唐集团科学技术研究院有限公司华中电力试验研究院 Multistage intelligent denitration on-line optimization control system based on data driving

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