CN104258698B - SNCR denitration reductant injection system - Google Patents
SNCR denitration reductant injection system Download PDFInfo
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- CN104258698B CN104258698B CN201410520886.2A CN201410520886A CN104258698B CN 104258698 B CN104258698 B CN 104258698B CN 201410520886 A CN201410520886 A CN 201410520886A CN 104258698 B CN104258698 B CN 104258698B
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Abstract
The invention discloses a kind of SNCR denitration reductant injection system, it is related to a kind of gas cleaning denitrification apparatus, including cyclone separator, and the denitrfying agent injection apparatus for being arranged in the cyclone inlet flue, it is characterised in that：The medial surface of the cyclone inlet flue has intersecting the first face and the second face successively along entrance to interior direction, and first the lateral surface of face relative separation device form 10~45 ° of angle, the denitrfying agent injection apparatus is arranged in the second face, and apart from the minimum side of medial surface of cyclone inlet flue height L between 0.5~0.8 whole height H.The present invention can effectively reduce the abrasion of denitrfying agent injection apparatus, and especially significantly improve denitration efficiency but reduces denitrfying agent usage amount simultaneously.
Description
Technical field
The present invention relates to a kind of gas cleaning denitrification apparatus, more particularly to SNCR denitration device, more particularly to fire coal CFB-
SNCR。
Background technology
The industrial production nitrogen oxide emission of the industries such as China's coal fired power generation, steel, cement is huge, oneself turn into be only second to
The atmosphere pollution of sulfur dioxide, acid rain problem, air quality problems, atmosphere ozone layer destroying are increasingly protruded.It is Chinese at present
Turn into the big Acid Rain Zone in third place in the world after Europe and North America, so as to the sustainable development to China's economy causes serious ring
Border pressure.
SNCR is a kind of NOx control technologies of mature.SNCR cardinal principles be under no catalyst action, to
Denitrfying agent (usually nitrogen agent), reducing agent and NOx reactions generation N in flue gas are sprayed in 870~1150 DEG C of high-temperature flue gas2。
NOx emission is low in itself for CFB furnace, and thermal power plant's NOx emission limit value will be from 450-1100mg/Nm3(pressing 2003 editions standards)
It is adjusted to 100-200mg/Nm3.And key area (Beijing, Tianjin, Hebei, Shanghai, Zhejiang, Jiangsu, Guangdong, thermoelectricity installation account for
National 29.6%) NOx emission limit value 100mg/Nm3, because CFB furnace is the ash type of furnace high, this is larger for implementing SCR difficulty.It is real
Apply SNCR technologies and would is that the most economical means of CFB furnace.
In existing SNCR, for the various ways that are disposed with of denitration injection apparatus, cyclone inlet is routinely arranged in
There is following subject matter in flue, the arrangement：
1) because entrance ash content and flow velocity are higher so that wear phenomenon easily occurs in spray gun.
2) component in ash plays the role of reduction to the utilization rate of denitrification reducing agent so that institute in the case of identical denitration efficiency
The reduction dosage for needing is bigger.
3) importantly, prior art is arranged denitrfying agent injection apparatus in separator inlet, and according to routine
Thinking, arrangement height of the denitrfying agent injection apparatus in separator is lower, and (height L is denitrfying agent injection apparatus apart from whirlwind point
From the minimum side of the medial surface of device gas approach highly, height H be it is following on medial surface between whole height), denitrfying agent injection
It is more long that the denitrfying agent that device is sprayed mixes residence time of the product in separator for producing with flue gas, mixes more abundant, institute
The denitration effect that can be produced is better.
Therefore, prior art is all intended to set as far as possible low by arrangement height L.
The content of the invention
It is an object of the invention to：A kind of SNCR denitration reductant injection system is proposed, denitrfying agent spray can be effectively reduced
The abrasion of injection device, especially significantly improve denitration efficiency but reduces denitrfying agent usage amount simultaneously.
The purpose of the present invention is realized by following technical proposals：
A kind of SNCR denitration reductant injection system, including cyclone separator, and be arranged in the cyclone separator and enter
The denitrfying agent injection apparatus of mouth flue, the medial surface of the cyclone inlet flue has successively along entrance to interior direction
Intersecting the first face and the second face, and the lateral surface of the first face relative separation device forms 10~45 ° of angle, the denitrfying agent spray
Injection device is arranged in the second face, and height L apart from the minimum side of medial surface of cyclone inlet flue is 0.5~0.8 whole
Between individual height H.
In such scheme, the inventors discovered that, show that the ash in flue gas contains for the research that recirculating fluidized bed implements SNCR
Amount has certain inverse making to use to SNCR, simultaneously as the presence of entrance high flow rate and ash quantity high causes that abrasion easily occurs in spray gun
Situation, this programme is arranged in separator inner side by by spray gun first, and compared to outside, inherently ash concentration is lower slightly for inner side, while interior
The two-sided replicated structures of side-specific so that the second face region ash concentration is further substantially reduced, effectively reduce ash concentration pair
The possibility of denitration reaction influence, thus, injection apparatus is arranged in the second face of low grey low regime, improves the utilization of reducing agent
Rate reduces the abrasion of spray gun simultaneously.Wherein, the denitrfying agent injection apparatus is arranged in the second face and refers to denitrfying agent through injection
Device sprays from the face.
Importantly, on the basis of aforementioned structure design, the present inventor further has found under study for action, using the knot
After structure, be not recognized always in the inertial thinking or prejudice such as prior art " arrangement denitrfying agent injection apparatus is being separated
Height in device is lower, and the denitrfying agent that denitrfying agent injection apparatus is sprayed mixes product the stopping in separator for producing with flue gas
Stay the time more long, mix more abundant, the denitration effect that can be generated is better ", according to the result of the present inventor's lot of experiments, can
With it is evident that, after Burners Positions are optimized between 0.5H~0.8H, denitration efficiency can reach 80% or so,
This than equally taking other conventional meanses in the prior art, and only under conditions of cyclone separator arrangement injection apparatus, denitration
Efficiency is much higher, while saving reduction in the case of L is less than the 0.5H arrangement identical denitration efficiencies of injection apparatus than prior art
Agent reaches more than 50%, it is seen that this programme on the basis of aforementioned structure is improved, break by the further improvement of arrangement height
The thinking of conventional lance arrangement, achieves unexpected effect.
Alternatively, the L is between 0.6~0.8H.
Used as further selection, the L is between 0.65~0.8H.
Alternatively, the lateral surface of the first face relative separation device forms 10~45 ° of angle.
Used as further selection, the lateral surface of the first face relative separation device forms 25~45 ° of angle.
In such scheme, the present inventor is had found under study for action, and the angle that the lateral surface of the first face relative separation device is formed is got over
Greatly, the low gray area of the inertia of generation is more obvious, and institute is formed as further selection, the lateral surface of the first face relative separation device
20~45 ° of angle, more preferably 25~45 ° of angle.
Alternatively, the lateral surface of the second face relative separation device forms 0~15 ° of angle.
Used as further selection, the lateral surface of the second face relative separation device forms 0~5 ° of angle.
In such scheme, the special angle in the second face is easily installed the low gray area safeguarded and protect and produce.
Alternatively, the cyclone separator arranges vertically, the denitrfying agent injection apparatus injection direction horizontal vertical institute
State the second face.
Foregoing main scheme of the invention and its each further selection scheme can be this with independent assortment to form multiple schemes
Invention can be used and claimed scheme：Such as the present invention, respectively it is combined with other selections by selection, people in the art
Member can understand there is multiple combination after the present invention program is understood according to prior art and common knowledge, be claimed by the present invention
Technical scheme, exhaustion is not done herein.
Beneficial effects of the present invention：The abrasion of denitrfying agent injection apparatus is effectively reduced, denitration efficiency is especially significantly improved
But denitrfying agent usage amount is reduced simultaneously.
Brief description of the drawings
Fig. 1 is the horizontal layout schematic diagram of the embodiment of the present invention；
Fig. 2 is the layout angle schematic diagram of Fig. 1；
Fig. 3 is the arrangement high-level schematic of Fig. 1；
In figure, 1 cyclone separator medial surface, 2 cyclone separator lateral surfaces, 3 cyclone inlets, 4 cyclone separators,
5 spray guns, 11 first faces, 12 second faces.
Specific embodiment
With reference to specific embodiments and the drawings, the present invention is further illustrated.
Embodiment 1：
With reference to shown in Fig. 1-3, a kind of SNCR denitration reductant injection system, including cyclone separator 4, and be only arranged in
The denitrfying agent injection apparatus of cyclone inlet flue, the medial surface 1 of cyclone inlet flue is along entrance 3 to interior side
To having intersecting the first face 11 and the second face 12 successively, and the relative separation device of the first face 11 lateral surface shape angle at 45 °
A, the lateral surface of the relative separation device of the second face 12 forms 0 ° of angle b, and denitrfying agent injection apparatus is arranged in the second face 12, and distance
The height L on the minimum side of medial surface of cyclone inlet flue is 0.8H.Alternatively, cyclone separator 4 is vertical arranges, takes off
The second face of nitre agent injection apparatus injection direction horizontal vertical 12, as shown in the direction of arrow in figure.Its denitration efficiency is up to
83%, the stoichiometric ratio of denitrfying agent is up to 1.5, while spray gun runs abrasion does not occur in 2 years.
Embodiment 2：
The present embodiment is substantially the same manner as Example 1, and its difference is：The lateral surface of the first face relative separation device forms 25 °
Angle, the lateral surface of the second face relative separation device forms 0 ° of angle.Its denitration efficiency is up to 80%, the change of denitrfying agent
It is up to 1.56 to learn equivalent proportion, while spray gun runs abrasion does not occur in 2 years.
Embodiment 3：
The present embodiment is substantially the same manner as Example 1, and its difference is：Denitrfying agent injection apparatus is arranged in the second face 12, and
Height L apart from the minimum side of the medial surface of cyclone inlet flue is 0.7H.Its denitration efficiency is up to 80%, denitration
The stoichiometric ratio of agent is up to 1.65, while spray gun runs abrasion does not occur in 2 years.
Embodiment 4：
The present embodiment is substantially the same manner as Example 1, and its difference is：Denitrfying agent injection apparatus is arranged in the second face 12, and
Height L apart from the minimum side of the medial surface of cyclone inlet flue is 0.6H.Its denitration efficiency is up to 81.5%, takes off
The stoichiometric ratio of nitre agent is up to 1.7, while spray gun runs abrasion does not occur in 2 years.
Embodiment 5：
The present embodiment is substantially the same manner as Example 1, and its difference is：Denitrfying agent injection apparatus is arranged in the second face 12, and
Height L apart from the minimum side of the medial surface of cyclone inlet flue is 0.55H.Its denitration efficiency is up to 81.5%,
The stoichiometric ratio of denitrfying agent is up to 1.71, while spray gun runs abrasion does not occur in 1 year.
Embodiment 6：
The present embodiment is substantially the same manner as Example 1, and its difference is：Denitrfying agent injection apparatus is arranged in the second face 12, and
Height L apart from the minimum side of the medial surface of cyclone inlet flue is 0.5H.Its denitration efficiency is up to 80.5%, takes off
The stoichiometric ratio of nitre agent is up to 1.72, while spray gun runs abrasion does not occur in 1 year.
Embodiment 7：
The present embodiment is substantially the same manner as Example 1, and its difference is：The lateral surface of the first face relative separation device forms 35 °
Angle, denitrfying agent injection apparatus is arranged in the second face 12, and apart from the minimum side of medial surface of cyclone inlet flue
Height L is 0.65H.Its denitration efficiency is up to 82.7%, and the stoichiometric ratio of denitrfying agent is up to 1.65, while spray gun is transported
There is not abrasion in row in 2 years.
Embodiment 8：
The present embodiment is substantially the same manner as Example 1, and its difference is：Denitrfying agent injection apparatus is arranged in the second face 12, and
Height L apart from the minimum side of the medial surface of cyclone inlet flue is 0.77H.Its denitration efficiency is up to 84.7%,
The stoichiometric ratio of denitrfying agent is up to 1.61, while spray gun runs abrasion does not occur in 2 years.
Comparative example 1：
The present embodiment is substantially the same manner as Example 1, and its difference is：The lateral surface of the first face relative separation device forms 40 °
Angle, the lateral surface of the second face relative separation device forms 0 ° of angle.Spray gun is arranged in separator outside, though its denitration efficiency
80% is so up to, but ammonia consumption is than embodiment 1 high 1/3, while spray gun there is more obvious abrasion in one month.
Comparative example 2：
The present embodiment is substantially the same manner as Example 1, and its difference is：The lateral surface of the first face relative separation device forms 10 °
Angle, the lateral surface of the second face relative separation device forms 0 ° of angle.Spray gun is arranged in the first face, and its denitration efficiency highest is only
75% can be reached, but ammonia consumption is than embodiment 1 high 1/4, while spray gun there is more obvious abrasion in two months.
Comparative example 3：
The present embodiment is substantially the same manner as Example 1, and its difference is：Denitrfying agent injection apparatus is arranged in the second face 12, and
Height L apart from the minimum side of the medial surface of cyclone inlet flue is 0.2H, and its denitration efficiency only up to reach 35%,
But ammonia consumption is than 1 high 1 times of embodiment, while spray gun there is more obvious abrasion in two months.
Comparative example 4：
The present embodiment is substantially the same manner as Example 1, and its difference is：Denitrfying agent injection apparatus is arranged in the second face 12, and
Height L apart from the minimum side of the medial surface of cyclone inlet flue is 0.35H, and its denitration efficiency only up to reach
55%, but ammonia consumption is than embodiment 1 high 1/2.
Comparative example 5：
The present embodiment is substantially the same manner as Example 1, and its difference is：Denitrfying agent injection apparatus is arranged in the second face 12, and
Height L apart from the minimum side of the medial surface of cyclone inlet flue is 0.45H, and its denitration efficiency only up to reach
65%, but ammonia consumption is than embodiment 1 high 1/3.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of SNCR denitration reductant injection system, including cyclone separator, and it is arranged in the cyclone inlet
The denitrfying agent injection apparatus of flue, it is characterised in that：The medial surface of the cyclone inlet flue is along entrance to interior side
To having intersecting the first face and the second face successively, and the lateral surface of the first face relative separation device forms 10~45 ° of angle, institute
State denitrfying agent injection apparatus and be arranged in the second face, and height L apart from the minimum side of medial surface of cyclone inlet flue is
Between 0.5~0.8 whole height H；The medial surface of the cyclone inlet flue refers to that cyclone inlet flue is leaned on
The facade at nearly cyclone separator center, the lateral surface of the cyclone inlet flue refer to cyclone inlet flue with
Foregoing medial surface is relative, and away from another facade at cyclone separator center, the denitrfying agent injection apparatus is arranged in second
Face refers to denitrfying agent and is sprayed from the face through injection apparatus.
2. SNCR denitration reductant injection system as claimed in claim 1, it is characterised in that：The L be 0.6~0.8H it
Between.
3. SNCR denitration reductant injection system as claimed in claim 2, it is characterised in that：The L be 0.65~0.8H it
Between.
4. SNCR denitration reductant injection system as claimed in claim 1, it is characterised in that：The first face relative separation device
Lateral surface form 20~45 ° of angle.
5. SNCR denitration reductant injection system as claimed in claim 4, it is characterised in that：The first face relative separation device
Lateral surface form 25~45 ° of angle.
6. SNCR denitration reductant injection system as claimed in claim 1, it is characterised in that：The second face relative separation device
Lateral surface form 0~15 ° of angle.
7. SNCR denitration reductant injection system as claimed in claim 6, it is characterised in that：The second face relative separation device
Lateral surface form 0~5 ° of angle.
8. SNCR denitration reductant injection system as claimed in claim 1, it is characterised in that：The vertical cloth of cyclone separator
Put, the second face described in the denitrfying agent injection apparatus injection direction horizontal vertical.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410520886.2A CN104258698B (en) | 2014-09-30 | 2014-09-30 | SNCR denitration reductant injection system |
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| CN201410520886.2A CN104258698B (en) | 2014-09-30 | 2014-09-30 | SNCR denitration reductant injection system |
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| CN104258698B true CN104258698B (en) | 2017-06-27 |
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| CN106287681A (en) * | 2016-01-18 | 2017-01-04 | 无锡华光锅炉股份有限公司 | A kind of separator inlet flue duct structure |
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| CN102974204A (en) * | 2012-12-13 | 2013-03-20 | 江苏百灵天地环境设计研究院有限公司 | Reaction device for SNCR (selective non-catalytic reduction) denitration system of circulating fluid bed |
| CN203764106U (en) * | 2014-01-26 | 2014-08-13 | 浙江天蓝环保技术股份有限公司 | Flue gas denitrification device implemented by combining SNCR (selective non-catalytic reduction)-ozone oxidation with wet absorption |
| CN204121957U (en) * | 2014-09-30 | 2015-01-28 | 东方电气集团东方锅炉股份有限公司 | SNCR denitration reductant injection system |
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