CN104279574B - The NO_x Reduction by Effective of a kind of CFBB improves device - Google Patents

The NO_x Reduction by Effective of a kind of CFBB improves device Download PDF

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Publication number
CN104279574B
CN104279574B CN201310278831.0A CN201310278831A CN104279574B CN 104279574 B CN104279574 B CN 104279574B CN 201310278831 A CN201310278831 A CN 201310278831A CN 104279574 B CN104279574 B CN 104279574B
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China
Prior art keywords
improves
flue
air channel
screen
burner hearth
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CN201310278831.0A
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Chinese (zh)
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CN104279574A (en
Inventor
陈云龙
刘建俊
袁沛沛
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江苏汇能锅炉有限公司
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Publication of CN104279574A publication Critical patent/CN104279574A/en
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Abstract

The NO_x Reduction by Effective that the invention discloses a kind of CFBB improves device, described denitration improves device and includes burner hearth, flue, supporting steel frame, primary air piping, secondary air channel, described primary air piping is on flue, secondary air channel connects burner hearth and flue, described burner hearth includes water screen tube, front wall, water tank, drum, 4 water separators are set up in described drum, described front wall outer wall sets up a piece of supercooling screen, near described supercooling screen, increase by three on the front wall of position cross heat shielding, between described flue top to supercooling screen, set up two grades of direct-contact desuperheaters of 1 set and connect pipeline, one layer of secondary air channel is increased on described denitration improves, described secondary air channel basecoat improves primary air piping, present invention achieves described CFBB denitration amount and drop to 250Ng/Nm3Hereinafter, and its simple in construction, with low cost, be easily achieved.

Description

The NO_x Reduction by Effective of a kind of CFBB improves device

Technical field

The present invention relates to circulating fluidized bed boiler denitration field, the NO_x Reduction by Effective of a kind of CFBB improves device.

Background technology

3 × 75t/h time high temperature sub-high pressure CFBB, current boiler peak load can take 80t/h to, and bed temperature is at about 1050 DEG C.

According to national environmental protection policy, within 2014, station boiler NOx discharge is intended to reach below 100mg/Nm3, and boiler NOx original emission is all at about 350-400mg/Nm3.Consider that denitration cost needs, reduce boiler NOx original emission.

NOx is mainly formed by three kinds of approach: heating power type, Quick-type, fuel type.Quick-type NOx only results from the situation using nitrogen-free hydro-carbon fuel, therefore puts aside.Range of operation according to CFBB is at 850-950 DEG C and oxygen concentration levels, and the synthesis speed of thermal NO x is the lowest.Therefore the main source of the NOx that fuel type NOx produces when being coal combustion, accounts for 70-90%.

The reason that NOx original emission is the highest, mainly bed temperature are high, oxygen amount is high, and these two kinds of factors influence each other;Owing to bed temperature is high, First air adds excessive, causes air quantity bigger than normal, and furnace outlet excess air coefficient is bigger than normal, and additionally the height of lower floor's overfire air port distance air distribution plate is relatively low, and overfire air fan air quantity is less than normal, power of motor is less than normal, causes boiler fractional combustion effect undesirable.

Summary of the invention

It is an object of the invention to low cost and reduce boiler NOx original emission to 250Ng/Nm3Below.

nullIn order to realize the purpose of the present invention,The NO_x Reduction by Effective having invented a kind of CFBB improves device,Including burner hearth、Flue、Supporting steel frame、Primary air piping、Secondary air channel,Described supporting steel frame supports burner hearth and flue,Described flue is connected on the right side of burner hearth,Described primary air piping is on flue,Secondary air channel connects burner hearth and flue,Described burner hearth includes water screen tube、Front wall、Water tank、Drum,Described water screen tube connects front wall and drum along front inner wall,Described drum is connected to above front wall,Described water tank is connected in above the front wall on the left of drum,Water separator is set up in described drum,Described front wall outer wall sets up supercooling screen,Heat shielding was increased on the front wall of position near described supercooling screen,Between described flue top to supercooling screen, set up two grades of direct-contact desuperheaters and connect pipeline,One layer of secondary air channel is increased on described denitration improves,Described secondary air channel caliber strengthens,Described secondary air channel basecoat reconfiguration primary air piping.

Described improvement device adds the water separator of 4, set up a piece of supercooling screen, three cross heat shielding, 1 set two grades of direct-contact desuperheaters and connect pipeline.

Described heat shielding of crossing is the 12 chromium 1 molybdenum vanadium alloy pipes performed according to GB 5310 high-pressure boiler tube.

Described two grades of direct-contact desuperheaters and connection pipeline are the 15 Cr-Mo-V compo pipes performed according to GB 5310 high-pressure boiler tube.

The beneficial effects of the present invention is:

1. described in, circulating fluidized bed boiler NOx discharge is from 350-400mg/Nm3Drop to 250Ng/Nm3Hereinafter, denitration effect is notable;

2. apparatus structure described in is simple, with low cost, it is easy to accomplish.

Accompanying drawing explanation

Figure 1 It isThe NO_x Reduction by Effective of a kind of CFBB improves the structural representation of device.

Detailed description of the invention

In order to deepen the understanding of the present invention, the present invention is further described with embodiment below in conjunction with the accompanying drawings, and this embodiment is only used for explaining the present invention, does not constitute protection scope of the present invention and limits.

nullAs shown in Figure 1,The present invention is that the NO_x Reduction by Effective of a kind of CFBB improves device,Including burner hearth 1、Flue 10、Supporting steel frame 13、Primary air piping 11、Secondary air channel 12,Described supporting steel frame 13 supports burner hearth 1 and flue 10,Described flue 10 is connected on the right side of burner hearth 1,Described primary air piping 11 is on flue 10,Secondary air channel 12 connects burner hearth 1 and flue 10,Described burner hearth 1 includes water screen tube 2、Front wall 3、Water tank 7、Drum 9,Described water screen tube 2 connects front wall 3 and drum 9 along front inner wall,Described drum 9 is connected to above front wall 3,Described water tank 7 is connected in above the front wall 3 on the left of drum 9,It is characterized in that: in described drum 9, set up water separator 8,Described front wall 3 outer wall sets up supercooling screen 5,Heat shielding 4 was increased on the front wall 3 of position near described supercooling screen 5,Between described flue 10 top to supercooling screen 5, set up two grades of direct-contact desuperheaters and connect pipeline 6,One layer of secondary air channel 12 is increased on described denitration improves,Described secondary air channel 12 caliber strengthens,Described secondary air channel 12 basecoat reconfiguration primary air piping 11.

Described heat shielding 4 of crossing is the 12 chromium 1 molybdenum vanadium alloy pipes performed according to GB 5310 high-pressure boiler tube.

Described two grades of direct-contact desuperheaters and connection pipeline 6 are the 15 Cr-Mo-V compo pipes performed according to GB 5310 high-pressure boiler tube.

The actual conditions that it is high for circulating sulfuration boiler bed temperature, oxygen amount high, secondary air flow is little that described NO_x Reduction by Effective improves are improved.

First, burner hearth increases evaporating heating surface, increases heat shielding 4, supercooling screen 5 to increase burner hearth evaporation heating area to reduce bed temperature, and 5 evaporation capacity meeting heat supply peak period are shielded in newly-increased supercooling.

Secondly, when running according to boiler at low load, the situation that Stream temperature degree is on the low side, increase superheater surface in burner hearth 1, and increase by two grades of direct-contact desuperheaters and connect pipeline 6, both reduced bed temperature, and ensured that Stream temperature degree during underrun.

Again, for the situation that secondary air flow is less than normal, the wind regime of former burner hearth lower floor secondary air channel, reconfiguration primary air fan, secondary air channel position, former upper strata is motionless, is further added by one layer of secondary air channel, after secondary air channel rearranges, the secondary air channel spout height away from air distribution plate has all reached the requirement of fractional combustion, reduces NOx generation amount further.

The beneficial effects of the present invention is:

1. described in, circulating fluidized bed boiler NOx discharge is from 350-400mg/Nm3Drop to 250Ng/Nm3Hereinafter, denitration effect is notable;

2. apparatus structure described in is simple, with low cost, it is easy to accomplish.

What embodiments of the invention were announced is preferred embodiment, but is not limited thereto, those of ordinary skill in the art; easily according to above-described embodiment, understand the spirit of the present invention, and make different amplifications and change; but as long as without departing from the spirit of the present invention, the most within the scope of the present invention.

Claims (5)

  1. null1. the NO_x Reduction by Effective of a CFBB improves device,Including burner hearth (1)、Flue (10)、Supporting steel frame (13)、Primary air piping (11)、Secondary air channel (12),Described supporting steel frame (13) supports burner hearth (1) and flue (10),Described flue (10) is connected to burner hearth (1) right side,Described primary air piping (11) is on flue (10),Secondary air channel (12) connects burner hearth (1) and flue (10),Described burner hearth (1) includes water screen tube (2)、Front wall (3)、Water tank (7)、Drum (9),Described water screen tube (2) connects front wall (3) and drum (9) along front inner wall,Described drum (9) is connected to front wall (3) above,Described water tank (7) is connected in front wall (3) top in drum (9) left side,It is characterized in that: in described drum (9), set up water separator (8),Described front wall (3) outer wall sets up supercooling screen (5),Heat shielding (4) was increased on the front wall (3) of position near described supercooling screen (5),Near described flue (10) top to be subcooled between screen (5) set up two grades of direct-contact desuperheaters and connection pipeline (6),One layer of secondary air channel (12) is increased on described denitration improves,Described secondary air channel (12) caliber strengthens,Described secondary air channel (12) basecoat reconfiguration primary air piping (11).
  2. The NO_x Reduction by Effective of a kind of CFBB the most according to claim 1 improves device, it is characterized in that: the water separator (8) of increase is 4, the supercooling screen (5) set up is a piece of, and crossing heat shielding (4) is three, and two grades of direct-contact desuperheaters and connection pipeline (6) are 1 set.
  3. The NO_x Reduction by Effective of a kind of CFBB the most according to claim 1 improves device, it is characterised in that: described secondary air channel (12) caliber is φ 219 millimeters.
  4. The NO_x Reduction by Effective of a kind of CFBB the most according to claim 1 improves device, it is characterised in that: the described material crossing heat shielding (4) is the 12 chromium 1 molybdenum vanadium alloy pipes performed according to GB 5310.
  5. The NO_x Reduction by Effective of a kind of CFBB the most according to claim 1 improves device, it is characterised in that: the material of described two grades of direct-contact desuperheaters and connection pipeline is the 15 Cr-Mo-V compo pipes performed according to GB 5310.
CN201310278831.0A 2013-07-04 2013-07-04 The NO_x Reduction by Effective of a kind of CFBB improves device CN104279574B (en)

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CN104279574B true CN104279574B (en) 2016-09-07

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2118064B (en) * 1979-01-31 1984-06-27 Foster Wheeler Power Prod An internal dust recirculation system for a fluidized bed heat exchanger
CN102168852A (en) * 2010-12-23 2011-08-31 北京机电院高技术股份有限公司 Method and device for reducing emission limits of nitrogen oxides in waste incineration flue gas
CN102537980A (en) * 2012-01-16 2012-07-04 哈尔滨工业大学 High-temperature melting treatment system and method for sludge
CN203501197U (en) * 2013-07-04 2014-03-26 江苏汇能锅炉有限公司(丹阳锅炉辅机厂有限公司) Efficient denitration improvement device for circulating fluidized bed boiler

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2118064B (en) * 1979-01-31 1984-06-27 Foster Wheeler Power Prod An internal dust recirculation system for a fluidized bed heat exchanger
CN102168852A (en) * 2010-12-23 2011-08-31 北京机电院高技术股份有限公司 Method and device for reducing emission limits of nitrogen oxides in waste incineration flue gas
CN102537980A (en) * 2012-01-16 2012-07-04 哈尔滨工业大学 High-temperature melting treatment system and method for sludge
CN203501197U (en) * 2013-07-04 2014-03-26 江苏汇能锅炉有限公司(丹阳锅炉辅机厂有限公司) Efficient denitration improvement device for circulating fluidized bed boiler

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Address after: 212362 Zhenjiang city of Jiangsu Province, Danyang City, Ling Zhen Dan Jin Road No. 88

Applicant after: JIANGSU HUINENG BOILER CO., LTD. (DANYANG BOILER AUXILIARY MACHINERY PLANT CO., LTD.)

Address before: 212362 Zhenjiang city of Jiangsu Province, Danyang City, Ling Zhen Dan Jin Road No. 88

Applicant before: Jiangsu Huineng Boiler Co. Ltd. (Danyang boiler auxiliary equipment factory Co., Ltd.)

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