CN205495327U - SNCR denitrification facility of pyrolysis furnace flue gas - Google Patents
SNCR denitrification facility of pyrolysis furnace flue gas Download PDFInfo
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- CN205495327U CN205495327U CN201620057736.7U CN201620057736U CN205495327U CN 205495327 U CN205495327 U CN 205495327U CN 201620057736 U CN201620057736 U CN 201620057736U CN 205495327 U CN205495327 U CN 205495327U
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Abstract
The utility model relates to a SNCR denitrification facility of pyrolysis furnace flue gas, include: the radiant section spray gun in pyrolysis furnace furnace radiant section is installed to the in bank, and the section of the spaning spray gun in the pyrolysis furnace furnace section of spaning is installed to the in bank, and the convection zone spray gun in pyrolysis furnace furnace convection zone is installed to the in bank, radiant section spray gun, the section of spaning spray gun and convection zone spray gun pass through the pipeline and be connected with reductant measurement distributor. The utility model discloses fully consider actual motion situation, distribution of temperature, the NOx emission performance of pyrolysis furnace, set the spray gun of reductant according to the characteristics of pyrolysis furnace at furnace's three burning zone in a row to arrange through rationally setting up the spray gun, realize that the NOx in spray gun blowout reductant and the flue gas fully reacts, reach the purpose that detects the nitrogen oxide pollutant, realized SNCR denitration technology in the pyrolysis furnace.
Description
Technical field
This utility model relates to the device of a kind of pyrolysis furnace flue gas SNCR denitration, is a kind of environmental protecting device, is a kind of environmental protecting device for petrochemical equipment.
Background technology
Petrochemical processing pyrolysis furnace is widely present in oil refining apparatus and chemical plant installations, radiation chamber that it is surrounded by refractory material, forms across section and convection section, and working medium is heated by the heat utilizing burning fuel gas or fuel oil to produce.Flue gas is produced in petrochemical processing pyrolysis furnace combustion process.It is big compared with little, fluctuation range that this flue gas has tolerance, and because being affected the features such as smoke components is changeable, nitrous oxides concentration changes greatly by propellant composition, (general nitrous oxides concentration is at 120～200 mg/Nm3).According to environmental protection standard, it is necessary to petrochemical processing pyrolysis furnace flue gas is taked denitration process (be presently required and reach discharged nitrous oxides concentration at 100 below mg/Nm3).
The domestic research being directed to pyrolysis furnace gas denitrifying technology is started late, a small amount of building up put into operation denitrification apparatus also be use SCR method denitration technology.The conditions such as cause is complicated by the combustion position of petrochemical processing pyrolysis furnace own, structure is special, temperature conditions is harsh are restricted, and there is presently no the SNCR denitration process system for pyrolysis furnace.
Summary of the invention
In order to overcome problem of the prior art, the utility model proposes the SNCR denitration device of a kind of pyrolysis furnace flue gas.The nitrogen oxides of petrochemical processing pyrolysis furnace flue gas is administered and is used SNCR denitration technique by described denitrification apparatus, effectively controls NOx concentration, it is achieved qualified discharge.
The purpose of this utility model is achieved in that the SNCR denitration device of a kind of pyrolysis furnace flue gas, including: in a row it is arranged on the radiant section spray gun in pyrolysis furnace radiation of burner hearth section, in a row be arranged on pyrolysis furnace burner hearth in section across section spray gun, in a row it is arranged on the convection section spray gun in pyrolysis furnace burner hearth convection section, described radiant section spray gun, is connected with reductant metering allotter by pipeline across section spray gun and convection section spray gun.
Further, described radiant section spray gun is arranged on the sidewall that radiant section is connected with across section, and the spout of spray gun points to across section, away from the distance on edge in sectione=0.0726C, whereinCHeight for radiant section.
Further, described is arranged on edge in section across section spray gun, away from convection section proximal, side wall distancef=1200～1500 millimeters.
Further, described convection section spray gun is arranged on convection section sidewall, and the spout of spray gun points to across section, away from the distance on edge under sectiong=2000～2500 millimeters.
Further, described radiant section spray gun, number across section spray gun, each row's spray gun of convection section spray gun be:, whereinnRound numbers, d is the distance between two spray guns, takes 1500～1800 millimeters,BLength for burner hearth.
Further, described radiant section spray gun, across the jet angle of section spray gun, the spout of convection section spray gun be 60 ° ~ 120 °.
Further, when the length/width ratio of described burner hearth is 1 ~ 1.6, jet angle is 60 ° ~ 80 °.
Further, when the length/width ratio of described burner hearth is 1.6 ~ 2.6, jet angle is 80 ° ~ 100 °.
Further, the length/width ratio of described burner hearth is during more than 2.6, and jet angle is 100 ° ~ 120 °.
This utility model produces and provides the benefit that: this utility model takes into full account the actual operating state of pyrolysis furnace, Temperature Distribution, NOx emission characteristic, feature according to pyrolysis furnace sets the spray gun of reducing agent in a row at three burning zones of burner hearth, and arrange by rationally arranging spray gun, realize spray gun ejection reducing agent fully to react with the NOx in flue gas, reach to detect the purpose of nitrogen oxides pollution thing, pyrolysis furnace achieves SNCR denitration technique.Compared with SCR denitration technique, SNCR denitration process system has the advantages such as equipment is few, the duration is short, small investment, operating cost are low.Therefore, pyrolysis furnace flue-gas denitration process uses SNCR denitration technique, creates good economic benefit.
Accompanying drawing explanation
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.
Fig. 1 is the spray gun distribution schematic diagram of device described in embodiment one of the present utility model；
Fig. 2 is the schematic diagram of the spray angle of spray gun described in embodiment six of the present utility model.
Detailed description of the invention
Embodiment one:
The present embodiment is the SNCR denitration device of a kind of pyrolysis furnace flue gas, as shown in Figure 1.The present embodiment includes: be in a row arranged on the radiant section spray gun 2 in pyrolysis furnace radiation of burner hearth section 1, in a row be arranged on pyrolysis furnace burner hearth in section 3 across section spray gun 4, in a row it is arranged on the convection section spray gun 6 in pyrolysis furnace burner hearth convection section 5, described radiant section spray gun, is connected with reductant metering allotter by pipeline across section spray gun and convection section spray gun.
The burner hearth of the pyrolysis furnace described in the present embodiment includes a horizontal heat exchange section: across section.Across section two vertical heat exchanging segments of connection: radiant section and convection section.Flue gas flows up at radiant section, after across the bottom horizontal flow sheet of section, continues up again flowing at convection section.Each heat exchanging segment of pyrolysis furnace burner hearth is long and narrow rectangle, as a example by radiant section, the length of radiant section is (see the B in Fig. 1, equal with radiant section across the length of section and convection section) the longest, but width (A see in Fig. 1) is smaller, and relative to width, the height (C see in Fig. 1) of radiant section is bigger.In each heat exchanging segment, heat exchange unit is arranged closely, it is possible to the temperature space being appropriate to SNCR denitration reaction is shorter.In order to ensure effectively to complete SNCR denitration reaction within the shorter time of staying and limited space, according to the feature of pyrolysis furnace burner hearth, the present embodiment has carried out specialized design to pattern and the layout of spray gun.
According to the feature that pyrolysis furnace length is longer, the present embodiment is provided with three rows along burner hearth length direction in burner hearth and sprays the spray gun of reducing agent in burner hearth, and each burning zone arranges row's spray gun.Reducing agent is sprayed in boiler by each spray gun uniformly, makes reducing agent mix the most uniformly with flue gas and react.
The layout of spray gun, according to lot of experimental data, customizes out the different structure of pyrolysis furnace, combustion position, load, the pyrolysis furnace SNCR computation model of smoke components, in order to design.Determine technological parameter and spray gun quantity and position.Spray gun position is at radiant section top, in the middle part of section with convection section bottom.
Spray gun uses multiple spot to arrange, it is ensured that SNCR sustained response.When pyrolysis furnace fuel or operating mode are adjusted, by opening, stop the spray gun of diverse location, reducing agent emitted dose and response location can be adjusted.Thus ensure higher denitration efficiency.
Owing to the burner hearth of pyrolysis furnace is sleeve configuration, the spray gun of big jet angle should be selected, first have to when selecting spray gun ensure that reducing agent droplet can be uniformly distributed in channel cross-section；Still further aspect, also to prevent the reducing agent sprayed into be ejected into opposite furnace wall, cause pyrolysis furnace local cooling.
Described spray gun uses high-temperature alloy to make, it is possible to the high-temperature flue gas bearing 1200 DEG C washes away.
The jet angle of spray gun is generally 100 ° ~ 120 °, and the atomizing particle size sprayed is preferably between 40～80 μm.Big jet angle spray gun both can guarantee that the abundant atomization spraying into reducing agent, can prevent again liquid from washing away offside furnace wall.
Following principle is typically utilized to determine the spray angle of spray gun:
The length/width ratio=1 ~ 1.6 of burner hearth, jet angle selects 60 ° ~ 80 °；
The length/width ratio=1.6 ~ 2.6 of burner hearth, jet angle selects 80 ° ~ 100 °；
The length/width of burner hearth selects 100 ° ~ 120 ° than ＞ 2.6, jet angle.
The jet angle of the spray gun that pyrolysis furnace uses is typically at 100 ~ 120 °.
Described reductant metering allotter (system) is conventional SNCR system equipment, it is therefore an objective to reducing agent is reasonably transported to each spray gun, and can regulate reducing agent emitted dose.
Embodiment two:
The present embodiment is the improvement of embodiment one, is the embodiment one refinement about radiant section spray gun.Radiant section spray gun described in the present embodiment is arranged on the sidewall that radiant section is connected with across section, and the spout of spray gun points to across section, away from the distance on edge in sectione =0.0726C, whereinCFor the height of radiant section, as shown in Figure 1.
The present embodiment determines the Burners Positions of radiation of burner hearth section, this position and the height of radiant sectionCRelevant:
Along distance on spray gun distance boiler(mm).
Radiant section spray gun is arranged on radiant section and the position across section handing-over, owing to across section being the burner hearth of one section of level, the level at top, and therefore, the installation site of radiant section spray gun is as the criterion with the top across section, and the spout direction of spray gun is pointed to across section.
Embodiment three:
The present embodiment is the improvement of embodiment two, is that embodiment two is about the refinement across section spray gun.It is arranged on edge in section across section spray gun, away from convection section proximal, side wall distance described in the present embodimentf =1200～1500 millimeters, as shown in Figure 1.
The injection direction of spray gun should be vertical with the direction of air flowing, can be only achieved the well-mixed purpose of flue gas of reducing agent and flowing, and therefore, the sensing of the spray gun in the present embodiment is vertical with the direction of flow of flue gas.
Embodiment four:
The present embodiment is the improvement of embodiment three, is the embodiment three refinement about convection section spray gun.Convection section spray gun described in the present embodiment is arranged on convection section sidewall, and the spout of spray gun points to across section, away from the distance on edge under sectiong =2000～2500 millimeters, as shown in Figure 1.
In the present embodiment, the spray gun of convection section points to across section, but owing to burner hearth has been turned upwards, so convection section spray gun really points to the direction vertical with flow of flue gas.
Embodiment five:
The present embodiment is the improvement of above-described embodiment, is the above-described embodiment refinement about spray gun number.Radiant section spray gun described in the present embodiment, number across section spray gun, each row's spray gun of convection section spray gun be:, whereinnRound numbers, d is the distance between two spray guns, takes 1500～1800 millimeters,BLength for burner hearth.
The quantity that each row is arranged is the most identical, is spaced the most identical, it is possible to use identical computing formula.
Embodiment six:
The present embodiment is the improvement of embodiment five, is the embodiment five refinement about spray gun.Radiant section spray gun described in the present embodiment, across the jet angle of section spray gun, the spout of convection section spray gun be 60 ° ~ 120 °.
Following principle is typically utilized to determine the spray angle of spray gun:
The length/width ratio=1 ~ 1.6 of burner hearth, jet angle selects 60 ° ~ 80 °；
The length/width ratio=1.6 ~ 2.6 of burner hearth, jet angle selects 80 ° ~ 100 °；
The length/width of burner hearth selects 100 ° ~ 120 ° than ＞ 2.6, jet angle.
The jet angle of the spray gun that pyrolysis furnace uses is typically at 100 ~ 120 °.
Finally it should be noted that, below only in order to the technical solution of the utility model to be described and unrestricted, although this utility model being described in detail with reference to preferred arrangement scheme, it will be understood by those within the art that, the technical solution of the utility model (form of such as spray gun, the mode etc. of arrangement) can be modified or equivalent, without deviating from the spirit and scope of technical solutions of the utility model.
Claims (9)
1. the SNCR denitration device of a pyrolysis furnace flue gas, it is characterized in that, including: in a row it is arranged on the radiant section spray gun in pyrolysis furnace radiation of burner hearth section, in a row be arranged on pyrolysis furnace burner hearth in section across section spray gun, in a row it is arranged on the convection section spray gun in pyrolysis furnace burner hearth convection section, described radiant section spray gun, is connected with reductant metering allotter by pipeline across section spray gun and convection section spray gun.
Device the most according to claim 1, it is characterised in that described radiant section spray gun is arranged on the sidewall that radiant section is connected with across section, the spout of spray gun points to across section, away from the distance on edge in sectione =0.0726C, whereinCHeight for radiant section.
Device the most according to claim 2, it is characterised in that described is arranged on edge in section across section spray gun, away from convection section proximal, side wall distancef =1200～1500 millimeters.
Device the most according to claim 3, it is characterised in that described convection section spray gun is arranged on convection section sidewall, the spout of spray gun points to across section, away from the distance on edge under sectiong =2000～2500 millimeters.
5. according to the device one of claim 1-4 Suo Shu, it is characterised in that described radiant section spray gun, number across section spray gun, each row's spray gun of convection section spray gun be:, whereinnRound numbers, d is the distance between two spray guns, takes 1500～1800 millimeters,BLength for burner hearth.
Device the most according to claim 5, it is characterised in that described radiant section spray gun, across the jet angle of section spray gun, the spout of convection section spray gun be 60 ° ~ 120 °.
Device the most according to claim 6, it is characterised in that when the length/width ratio of described burner hearth is 1 ~ 1.6, jet angle is 60 ° ~ 80 °.
Device the most according to claim 6, it is characterised in that when the length/width ratio of described burner hearth is 1.6 ~ 2.6, jet angle is 80 ° ~ 100 °.
Device the most according to claim 6, it is characterised in that the length/width ratio of described burner hearth is during more than 2.6, and jet angle is 100 ° ~ 120 °.
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| CN201620057736.7U CN205495327U (en) | 2016-01-21 | 2016-01-21 | SNCR denitrification facility of pyrolysis furnace flue gas |
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| CN201620057736.7U CN205495327U (en) | 2016-01-21 | 2016-01-21 | SNCR denitrification facility of pyrolysis furnace flue gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109055733A (en) * | 2018-10-29 | 2018-12-21 | 中冶长天国际工程有限责任公司 | A kind of grate kiln NOx removal method, apparatus and system |
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2016
- 2016-01-21 CN CN201620057736.7U patent/CN205495327U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109055733A (en) * | 2018-10-29 | 2018-12-21 | 中冶长天国际工程有限责任公司 | A kind of grate kiln NOx removal method, apparatus and system |
| CN109055733B (en) * | 2018-10-29 | 2020-02-14 | 中冶长天国际工程有限责任公司 | Method, device and system for removing NOx from grate-rotary kiln |
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