CN201632195U - Fume denitration device with ammonia injection grid having regulation capability - Google Patents
Fume denitration device with ammonia injection grid having regulation capability Download PDFInfo
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- CN201632195U CN201632195U CN2010201519179U CN201020151917U CN201632195U CN 201632195 U CN201632195 U CN 201632195U CN 2010201519179 U CN2010201519179 U CN 2010201519179U CN 201020151917 U CN201020151917 U CN 201020151917U CN 201632195 U CN201632195 U CN 201632195U
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- ammonia
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- ammonia injection
- spraying grid
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Abstract
A fume denitration device with an ammonia injection grid having regulation capability relates to a fume denitration device for selective catalytic reduction method and selective non-catalytic reduction method; a part of the ammonia injection grid is arranged in a flue, the ammonia injection grid comprises a plurality of ammonia injection branch pipes, each ammonia injection branch pipe is provided with an ammonia injection section and an ammonia conveying section, wherein the ammonia injection section is positioned in the flue, the ammonia conveying section is positioned outside the flue, the ammonia injection section is provided with a plurality of injection holes, wherein the distances between at least two pairs of adjacent ammonia injection branch pipes are unequal, and the lengths of at least two ammonia injection sections are unequal. The ammonia injection grid has low manufacturing cost and has strong regulation capability towards the dynamic station changes.
Description
Technical field
The utility model belongs to the technical field of denitrating flue gas device fabrication, relates to a kind of ammonia-spraying grid and method for designing thereof that is used for selective catalytic reduction and SNCR method equipment for denitrifying flue gas.
Background technology
These two kinds of gas denitrifying technologies of selective catalytic reduction and SNCR method are to use at present two kinds of the most general gas denitrifying technologies in the world, adopt in these two technology denitrification process the most that the device of core is an ammonia-spraying grid, and english abbreviation is AIG.Described ammonia-spraying grid partly places in the flue, flue and rear pass before it is divided into flue.Ammonia-spraying grid sprays ammonia NH3, and the nitrogen oxide NOx and the ammonia react of the flue gas before making in the flue change free of contamination materials such as nitrogen, water into.Ammonia-spraying grid is provided with some spray ammonia arms, this spray ammonia arm comprises ammonia jet segment and ammonia transportation section, the method of present known design ammonia-spraying grid is: the nitrous oxides concentration of the interior flue gas of flue is evenly distributed before supposing, in preceding flue, add physical measure such as deflector, flue gas in the preceding flue is evenly distributed, and make spray ammonia arm on bearing of trend perpendicular to flue, place in the flue in uniform mode, and make the length of ammonia jet segment in flue identical.
The method for designing of above-mentioned ammonia-spraying grid has increased the resistance of system and the cost cost of equipment for denitrifying flue gas; After physical measure can only be accomplished the flue gas mixed processing simultaneously, ammonia is relative even with the nitrous oxides concentration mixing, but, in the reality, the flue gas flow rate distribution of forward and backward flue and ammonia and nitrous oxides concentration distribute and remain uneven, the flue gas flow rate distribution dynamic changes, the ammonia-spraying grid that evenly sprays ammonia to the regulating power of operating mode dynamic change a little less than, and the escaping of ammonia rate is higher.
Therefore be necessary above-mentioned ammonia-spraying grid device and method for designing are improved in fact.
Summary of the invention
Technical problem: the purpose of this utility model is to provide a kind of low cost of manufacture and ammonia-spraying grid and the method for designing thereof strong to the regulating power of operating mode dynamic change.
Technology contents: the equipment for denitrifying flue gas with regulating power ammonia-spraying grid of the present utility model is achieved in that ammonia-spraying grid partly places in the flue, described ammonia-spraying grid comprises some spray ammonia arms, described spray ammonia arm is provided with ammonia jet segment and ammonia transportation section, wherein the ammonia jet segment is positioned at flue, the ammonia transportation section is positioned at outside the flue, the ammonia jet segment is provided with some spray-holes, has at least the spacing of two pairs of adjacent spray ammonia arms not wait, and has being uneven in length of two ammonia jet segments at least; Described ammonia transportation section is provided with the arm control valve.On described ammonia-spraying grid, also be provided with spray ammonia arm is fixed in bracing or strutting arrangement on the flue.
Beneficial effect: the beneficial effects of the utility model are: to the distribution and the careful consideration of ammonia diffusion having carried out of flue cross section velocity of flue gas before the ammonia-spraying grid, ammonia-spraying grid differentiation method for designing based on the velocity of flue gas distribution has been proposed, make ammonia-spraying grid can adapt to the characteristics of flue cross section velocity of flue gas skewness and velocity of flue gas dynamic change, ammonia nitrogen concentration rationally mates, ammonia-spraying grid strengthens greatly to the regulating power of operating mode dynamic change, and system's dynamic response characteristic improves.In addition, the utility model need not other physical measure, reduces cost.
Description of drawings
Fig. 1 is the schematic diagram of the utility model ammonia-spraying grid;
Fig. 2 be A-A shown in Figure 1 to cutaway view.
The specific embodiment
See also Fig. 1 to shown in Figure 2, ammonia-spraying grid of the present utility model, part places in the flue of equipment for denitrifying flue gas, it comprises some spray ammonia arms 1, described spray ammonia arm 1 is provided with ammonia jet segment 2 and ammonia transportation section 3, wherein ammonia jet segment 2 is positioned at flue, and ammonia transportation section 3 is positioned at outside the flue, and ammonia jet segment 2 and ammonia transportation section 3 are connected by flange.Ammonia transportation section 3 is provided with arm control valve 4.Wherein, the spacing of described at least two adjacent spray ammonia arms 1 does not wait, and being uneven in length of at least two ammonia jet segments 2.Have number on the ammonia jet segment 2 and do not wait the spray-hole 6 of non-uniform Distribution.The distribution of the number of spray ammonia arm 1, length, position and reaction zone flue cross section and flue gas, velocity of flue gas is relevant.
Described ammonia-spraying grid also is provided with the bracing or strutting arrangement 5 that spray ammonia arm 1 is fixed on the flue.
Below in conjunction with accompanying drawing, describe the method for designing of ammonia-spraying grid of the present invention in detail.
The method for designing of ammonia-spraying grid of the present utility model comprises the steps:
The distribution of the velocity of flue gas of arbitrary section in step S001, the efficiency goal of determining ammonia-spraying grid, residual the escaping of ammonia target and the flue, the big young pathbreaker's velocity of flue gas according to efficiency goal is divided into some control areas again.Wherein, efficiency goal is meant the set-point of denitration efficiency, and residual the escaping of ammonia rate also is directly given by standard, and these two values are the direct requirements of engineering and environmental protection standard.The efficiency of selection goal-setting is 80% in the present embodiment, and residual the escaping of ammonia rate is not more than 3ppm; Velocity interval is between 0～6.75m/s.
Step S002, provide some spray ammonia arms 1, described spray ammonia arm 1 is provided with ammonia jet segment 2 and ammonia transportation section 3, and wherein ammonia jet segment 2 is positioned at flue, and ammonia transportation section 3 is positioned at inside and outside the flue, described ammonia transportation section 3 is provided with arm control valve 4, and ammonia jet segment 2 is provided with some spray-holes 6.
Step S003, determine the quantity of each control area spray ammonia arm 1 and the size of spray-hole 6 distributions, quantity and each spray-hole 6 on ammonia jet segment 2 according to efficiency goal, residual the escaping of ammonia target and flue gas flow rate distribution etc.Wherein higher control area to velocity of flue gas, as speed is the zone of 5～6.75m/s, exhaust gas volumn is 50000Nm3/h in the example, quantity 2～3 sprays ammonia arm 1 and 4～5 spray-holes 6 that perforate is bigger are set, regulate arm control valve 4 simultaneously and be larger opening, the control area low to velocity of flue gas is the zone of 1～2m/s as speed, 1 spray ammonia arm 1 and 2～3 spray-holes 6 that perforate is less are set, regulate arm control valve 4 simultaneously and be less aperture.According to efficiency goal, according to 1: 1 reaction of ammonia nitrogen mol ratio than calculating the theoretical ammonia spraying amount that reaches efficient, calculate the excessive value of spray ammonia according to residual the escaping of ammonia target, theoretical ammonia spraying amount obtains required total ammonia spraying amount with spray by the excessive value addition, and flue gas flow rate distributes and determines that arm distributes and perforate distributes and size.
The size of respectively spraying ammonia arm 1 spray-hole 6 distributions, quantity and each spray-hole 6 on ammonia jet segment 2 that step S004, basis are determined, the flow trace of the ammonia that each position spray-hole 6 on the spray ammonia state ammonia-spraying grid is down sprayed and migrate rule and simulate, obtain first diffusion result such as Fig. 5 of ammonia, simultaneously the concentration field behind the spray ammonia is simulated, obtain reacting first CONCENTRATION DISTRIBUTION such as Fig. 4 of cross section, back ammonia.
Step S005, according to the first diffusion result and first CONCENTRATION DISTRIBUTION, revise the quantity of each control area spray ammonia arm 1 and spray-hole 6 distributions on ammonia jet segment 2, the size of quantity and each spray-hole 6, by the control area higher to velocity of flue gas, the ammonia diffusion velocity is lower, as speed is the zone of 5～6.75m/s, exhaust gas volumn is 50000Nm3/h in the example, on bigger spray-hole 6 bases of 2～3 of former quantity spray ammonia arm 1 and 4～5 perforates, increase by 1 spray ammonia arm 1 and 4～5 spray-holes 6 that perforate is bigger, the control area low to velocity of flue gas, as speed is the zone of 1～2m/s, the ammonia diffusion velocity is higher, still keeps former quantity 1 spray ammonia arm 1 and 2～3 spray-holes 6 that perforate is less.Distribute and the flow trace of the ammonia that perforate sprays each position spray-hole 6 on the ammonia-spraying grid under the spray ammonia state again and migrate rule and simulate according to revised arm, obtain the second diffusion result of ammonia, simultaneously the concentration field behind the spray ammonia is simulated, obtain reacting second CONCENTRATION DISTRIBUTION of cross section, back ammonia.
Step S006, prescribed limit of setting are if the difference of the first diffusion result and the second diffusion result's difference and first CONCENTRATION DISTRIBUTION and second CONCENTRATION DISTRIBUTION finishes design in prescribed limit; If the difference of the first diffusion result and second diffusion result's the difference and first CONCENTRATION DISTRIBUTION and second CONCENTRATION DISTRIBUTION not in prescribed limit, execution in step S004, step S005 and step S006 successively.Described prescribed limit refers to the result error scope, and prescribed limit of the present invention is not more than 5%.
The utility model is according to the situation of each cross section velocity of flue gas skewness of the inherent structure characteristic decision of flue and equipment for denitrifying flue gas, obtain the distribution of the velocity of flue gas in the preceding flue cross section of ammonia-spraying grid, Changing Pattern according to velocity of flue gas, by its distribution subregion is carried out in the flue cross section, velocity ratio in conjunction with ammonia diluent air and flue gas, NOx concentration, the ejection angle, tube bank is arranged, factors such as ammonia-spraying grid support are carried out comprehensive optimizing to each zone, on this basis ammonia-spraying grid piping and spray-hole are designed, thus the quantity of the spray ammonia arm of definite each control area correspondence, the distribution of the spray-hole on the length of ammonia jet segment and the ammonia jet segment, size.And with design result by the ammonia of each position spray-hole ejection on the ammonia-spraying grid flow trace and migrate the simulation of rule and the CONCENTRATION DISTRIBUTION of cross section, reaction back ammonia is carried out regression optimization correction once more.
The above only is a better embodiment of the present utility model; protection domain of the present utility model does not exceed with above-mentioned embodiment; as long as the equivalence that those of ordinary skills do according to disclosed content is modified or changed, all should include in the protection domain of the present invention's record.
Claims (2)
1. equipment for denitrifying flue gas with regulating power ammonia-spraying grid, it is characterized in that: ammonia-spraying grid partly places in the flue, described ammonia-spraying grid comprises some spray ammonia arms (1), described spray ammonia arm (1) is provided with ammonia jet segment (2) and ammonia transportation section (3), wherein ammonia jet segment (2) is positioned at flue, ammonia transportation section (3) is positioned at outside the flue, ammonia jet segment (2) is provided with some spray-holes (6), have at least the spacing of two pairs of adjacent spray ammonia arms (1) not wait, and have being uneven in length of two ammonia jet segment (2) at least; Described ammonia transportation section (3) is provided with arm control valve (4).
2. the equipment for denitrifying flue gas with regulating power ammonia-spraying grid according to claim 1 is characterized in that also being provided with on described ammonia-spraying grid spray ammonia arm (1) is fixed in bracing or strutting arrangement (5) on the flue.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201519179U CN201632195U (en) | 2010-04-06 | 2010-04-06 | Fume denitration device with ammonia injection grid having regulation capability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201519179U CN201632195U (en) | 2010-04-06 | 2010-04-06 | Fume denitration device with ammonia injection grid having regulation capability |
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| CN201632195U true CN201632195U (en) | 2010-11-17 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354330A (en) * | 2011-07-26 | 2012-02-15 | 中环（中国）工程有限公司 | Method for optimizing parameters of ammonia-spraying device for matching sprayed ammonia with smoke airflow field in smoke denitration system |
| CN104226110A (en) * | 2014-10-09 | 2014-12-24 | 河南合众电力技术有限公司 | Coal-fired boiler SCR (Selective Catalytic Reduction) denitration control method and system |
| CN105582808A (en) * | 2016-03-14 | 2016-05-18 | 上海蓝科石化环保科技股份有限公司 | SCR denitration device and method |
| CN108499359A (en) * | 2018-05-15 | 2018-09-07 | 华电电力科学研究院有限公司 | A kind of whirlpool of automatic adjustment is mixed and anti-blocking ammonia-spraying grid device and its application process |
-
2010
- 2010-04-06 CN CN2010201519179U patent/CN201632195U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354330A (en) * | 2011-07-26 | 2012-02-15 | 中环（中国）工程有限公司 | Method for optimizing parameters of ammonia-spraying device for matching sprayed ammonia with smoke airflow field in smoke denitration system |
| CN104226110A (en) * | 2014-10-09 | 2014-12-24 | 河南合众电力技术有限公司 | Coal-fired boiler SCR (Selective Catalytic Reduction) denitration control method and system |
| CN104226110B (en) * | 2014-10-09 | 2017-05-24 | 河南合众电力技术有限公司 | Coal-fired boiler SCR (Selective Catalytic Reduction) denitration control method and system |
| CN105582808A (en) * | 2016-03-14 | 2016-05-18 | 上海蓝科石化环保科技股份有限公司 | SCR denitration device and method |
| CN105582808B (en) * | 2016-03-14 | 2017-11-24 | 上海蓝科石化环保科技股份有限公司 | A kind of SCR denitration device and method |
| CN108499359A (en) * | 2018-05-15 | 2018-09-07 | 华电电力科学研究院有限公司 | A kind of whirlpool of automatic adjustment is mixed and anti-blocking ammonia-spraying grid device and its application process |
| CN108499359B (en) * | 2018-05-15 | 2023-11-03 | 华电电力科学研究院有限公司 | Automatic-adjusting vortex-mixing anti-blocking ammonia spraying grid device and application method thereof |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101117 Termination date: 20130406 |