CN212523621U - Three wastes stove flue gas denitration minimum discharge structure - Google Patents
Three wastes stove flue gas denitration minimum discharge structure Download PDFInfo
- Publication number
- CN212523621U CN212523621U CN202020736739.XU CN202020736739U CN212523621U CN 212523621 U CN212523621 U CN 212523621U CN 202020736739 U CN202020736739 U CN 202020736739U CN 212523621 U CN212523621 U CN 212523621U
- Authority
- CN
- China
- Prior art keywords
- flue gas
- denitration
- flue
- nozzle
- spray tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model relates to a three wastes stove field specifically is an ultralow emission structure of three wastes stove flue gas denitration. Including horizontal flue, horizontal flue is connected to between three useless stoves and the flue gas aftertreatment unit, and vertical the running through is equipped with an at least spray tube on the horizontal flue, and the one end of spray tube is closed structure, and the other one end of spray tube is connected with the ammonia water pipeline, vertically installs at least three nozzle along on every spray tube, the aqueous ammonia direction that the nozzle erupted is with the flow direction syntropy of flue gas. Compared with the conventional SNCR + SCR combined denitration process, the denitration process has high efficiency, low use cost and less construction cost: the SNCR modification workload is small, and the denitration efficiency of the built-in nozzle is high; the catalyst is horizontally installed without introducing a flue, the single-layer arrangement and use amount of the catalyst is small, the system resistance is small, and the power consumption of a fan is low. At the current that the environmental protection requirement is stricter day by day, adopt the utility model discloses realize that low-cost flue gas denitration ultralow emission structure has apparent reference meaning, has good spreading value.
Description
Technical Field
The utility model relates to a three wastes stove field specifically is an ultralow emission structure of three wastes stove flue gas denitration.
Background
At present, the domestic mainstream denitration technology mainly comprises processes such as SNCR, SCR, low-nitrogen combustion, ozone and the like, wherein the SNCR and SCR technology is most widely used, generally speaking, in the early stage of environmental protection improvement, most of boiler flue gas denitration in China adopts an SNCR system, ammonia water or urea is generally used as a medium, the denitration reaction temperature is 850-950 ℃, the denitration efficiency is 50-60%, the denitration effect can meet the initial environmental protection index, but along with increasingly strict environmental protection requirement and gradual upgrade of the environmental protection index requirement, the SNCR denitration process cannot meet the national ultra-low emission index requirement in the current stage due to efficiency limitation.
As shown in FIG. 1, a schematic diagram of a conventional SNCR denitration structure is shown, wherein a spray gun 7 is installed outside a horizontal flue 1, a vertical furnace wall is installed, in order to avoid high-temperature abrasion from affecting the service life of the spray gun 7, the spray opening of the spray gun 7 must be flush with the inner wall of a water wall and cannot be arranged inside the flue, but the spray distance of the spray gun 7 is only 0.8-1.2 m, and the coverage area of the spray gun 7 is very limited. The spraying direction of the spray gun 7 is perpendicular to the flue gas flow direction and jets in, the flue gas flow velocity in the flue with the spraying section reaches 20-25 m/s, after the denitration agent is sprayed in, the flow direction is instantly changed under the tangential entrainment effect of the high-speed flue gas in the vertical direction near the spray gun 7, under the resultant force action of the spraying and the tangential lines in the vertical direction, the denitration agent drifts, moves downwards like a parabola dog-ear and is finally basically consistent with the flue gas flow direction, and therefore the denitration agent is prevented from continuously entering the center of the flue and cannot be fully mixed with the flue gas in the center of the flue, and the denitration efficiency.
In order to improve the denitration efficiency, an ultra-low emission structure for three-waste furnace flue gas denitration is needed urgently.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve present denitration technology and can not satisfy the problem that the national minimum environmental protection index required because of the efficiency limitation, provide a three waste stove flue gas denitration minimum discharge structure.
The utility model discloses a realize through following technical scheme: the utility model provides an ultralow emission structure of three wastes furnace flue gas denitration, includes horizontal flue, horizontal flue is connected to between three useless stoves and the flue gas aftertreatment unit, vertically runs through on the horizontal flue and is equipped with an at least spray tube, and the one end of spray tube is closed structure, and the other one end of spray tube is connected with the ammonia water pipeline, vertically installs at least three nozzle along on the every spray tube, the aqueous ammonia direction that the nozzle erupted and the flow direction syntropy of flue gas.
As a further improvement of the technical scheme of the utility model, the quantity of spray tube is two.
As the technical scheme of the utility model further improve, be close to the nozzle aperture on the spray tube of three useless stoves and be greater than the nozzle aperture on the spray tube of being close to flue gas aftertreatment unit.
As the utility model discloses technical scheme's further improvement, hang in the exhaust-heat boiler of flue gas aftertreatment unit and be equipped with the catalyst mounting bracket, the catalyst mounting bracket include with furnace wall fixed connection's external frame and install a plurality of supporting beam in the external frame, and all supporting beams divide into a horizontal supporting beam and a vertical supporting beam, and a plurality of regions are cut apart into by a horizontal supporting beam and a vertical supporting beam to the external frame, have all placed the catalyst in every region.
Three waste boiler flue gas denitration ultra-low discharge structure, compare with conventional SNCR + SCR combined denitration technology, denitration process efficiency is high, use cost is low, the construction cost is few: the SNCR modification workload is small, and the denitration efficiency of the built-in nozzle is high; the catalyst is horizontally installed without introducing a flue, the single-layer arrangement and use amount of the catalyst is small, the system resistance is small, and the power consumption of a fan is low. At the current that the environmental protection requirement is stricter day by day, adopt the utility model discloses realize that low-cost flue gas denitration ultralow emission structure has apparent reference meaning, has good spreading value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a conventional SNCR denitration system.
FIG. 2 is the SNCR denitration structure schematic diagram of the three-waste furnace flue gas denitration ultralow emission structure.
FIG. 3 is the structural schematic diagram of the catalyst mounting frame of the SCR of the three-waste furnace flue gas denitration ultralow emission structure.
In the figure: 1-horizontal flue, 2-spray pipe, 3-ammonia water pipeline, 4-spray nozzle, 5-external frame, 6-support beam and 7-spray gun.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The embodiment provides an ultralow emission structure of three wastes furnace flue gas denitration, including horizontal flue 1, horizontal flue 1 is connected to between three useless stoves and the flue gas aftertreatment unit, vertically runs through on horizontal flue 1 and is equipped with an at least spray tube 2, and the one end of spray tube 2 is closed structure, and the other one end of spray tube 2 is connected with ammonia water line 3, vertically installs at least three nozzle 4 along on every spray tube 2, the aqueous ammonia direction that nozzle 4 erupted is with the flow direction syntropy of flue gas.
In this embodiment, spray tube 2 is installed in horizontal flue 1, runs through the regional flue of denitration, and can set up a plurality of nozzles 4 according to flue size and denitration needs in the flue inside, can cover whole flue flow surface after the denitration agent atomizing, can well mix with the flue gas, and the denitration is efficient. The nozzles 4 cover the cross section of the whole flue, the spraying direction is consistent with the air flow direction, a larger diffusion angle is formed under the action of spraying power, all flue gas, particularly flue gas in the central part of the flue, can be fully mixed with the denitrifying agent, and thus the denitrifying efficiency is improved. Through the arrangement of the foregoing embodiment, the denitration efficiency of the SNCR can be improved to 70%.
Preferably, the number of the spray pipes 2 is two, and the aperture of the nozzle 4 on the spray pipe 2 close to the three-waste furnace is larger than that of the nozzle 4 on the spray pipe 2 close to the flue gas post-treatment unit. The front row of nozzles 4 has large aperture and large flow, and mainly has a coarse adjustment effect on NOx in the flue gas; the rear-row nozzles 4 are small in aperture, small in flow, high in atomization degree and capable of achieving fine adjustment of NOx, the flow ratio of the front-row nozzles to the rear-row nozzles 4 is 7:3, targeted adjustment can be conducted according to data conditions in operation, and meanwhile ammonia escape indexes of the system can be reduced.
Further, as shown in fig. 3. The flue gas aftertreatment unit's of this embodiment exhaust-heat boiler hangs in and is equipped with the catalyst mounting bracket, the catalyst mounting bracket includes with furnace wall fixed connection's external frame 5 and install a plurality of supporting beam 6 in external frame 5, and all supporting beam 6 divide into horizontal supporting beam and vertical supporting beam, and external frame 5 is cut apart into a plurality of regions by horizontal supporting beam and vertical supporting beam, has all placed the catalyst in every region. During specific implementation, the external frame 5 is fixedly connected with the periphery of the furnace wall through expansion wires, and the rest unused section between the external frame 5 and the furnace wall is blocked by a wear-resistant manganese steel plate, so that flue gas uniformly flows through the catalyst to perform denitration reaction. In particular, the front and back of the catalyst can be welded with a fixed pin to prevent the catalyst from shifting.
In this embodiment, the arrangement of the heating surface of the exhaust-heat boiler of the flue gas post-treatment unit is as follows from high to low in sequence: the device comprises a high-temperature superheater, a convection bank, an external superheater, an economizer and an air preheater, wherein the temperature of the external superheater is 360-410 ℃, the reaction temperature of the denitration catalyst can be met, and the device is suitable for arrangement of the SCR catalyst.
At present, an external superheater is abandoned, the external superheater is dismantled, a space with the height of about 7.3m, the width of about 2.55m, the depth of about 1.1m and about 20m can be vacated, after the external superheater is dismantled, a catalyst mounting rack is arranged at the position by utilizing an original hanging system, a catalyst is hung at the position where the external superheater is originally dismantled, the total weight of 70 catalysts can be set to be about 4 tons, the total weight of the catalyst mounting rack is about 6 tons, and the original hanging system can meet the use requirement.
After transformation, the temperature of the flue gas post-treatment unit is about 850-950 ℃, the denitration efficiency is about 70% after passing through, the NOx is reduced from initial 250mg/m to 75mg/m, and then the denitration efficiency is about 80% after passing through the SCR system in the exhaust-heat boiler, the NOx outlet index is 15-25 mg/m, and the comprehensive efficiency is about 90% above.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. The utility model provides an ultralow emission structure of three wastes discharge of gas denitration of waste gas stove, includes horizontal flue (1), horizontal flue (1) is connected to between three waste gas stoves and the flue gas aftertreatment unit, its characterized in that, vertically runs through on horizontal flue (1) and is equipped with an at least spray tube (2), and the one end of spray tube (2) is closed structure, and the other one end of spray tube (2) is connected with ammonia pipeline (3), vertically installs at least three nozzle (4) along on every spray tube (2), the ammonia water direction that nozzle (4) jetted and the flow direction syntropy of flue gas.
2. The ultra-low emission structure for denitration of flue gas of three-waste furnace according to claim 1, characterized in that the number of said spray pipes (2) is two.
3. The ultra-low emission structure for denitration of flue gas of three-waste furnace according to claim 2, characterized in that the aperture of the nozzle (4) on the nozzle (2) close to the three-waste furnace is larger than the aperture of the nozzle (4) on the nozzle (2) close to the flue gas post-treatment unit.
4. The ultra-low emission structure for denitration of flue gas of three-waste gas and waste water boiler as claimed in claim 1, 2 or 3, characterized in that a catalyst mounting rack is hung in the exhaust-heat boiler of the flue gas post-treatment unit, the catalyst mounting rack comprises an outer frame (5) fixedly connected with the furnace wall and a plurality of supporting beams (6) installed in the outer frame (5), all the supporting beams (6) are divided into a transverse supporting beam and a longitudinal supporting beam, the outer frame (5) is divided into a plurality of areas by the transverse supporting beam and the longitudinal supporting beam, and a catalyst is placed in each area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020736739.XU CN212523621U (en) | 2020-05-08 | 2020-05-08 | Three wastes stove flue gas denitration minimum discharge structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020736739.XU CN212523621U (en) | 2020-05-08 | 2020-05-08 | Three wastes stove flue gas denitration minimum discharge structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212523621U true CN212523621U (en) | 2021-02-12 |
Family
ID=74539971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020736739.XU Active CN212523621U (en) | 2020-05-08 | 2020-05-08 | Three wastes stove flue gas denitration minimum discharge structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212523621U (en) |
-
2020
- 2020-05-08 CN CN202020736739.XU patent/CN212523621U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100484612C (en) | Abrasion proof, vortex street strong mixing equipment in grille of spraying ammonia | |
| CN207694604U (en) | The adjustable full load denitrating system of denitration flue-gas temperature | |
| CN201454414U (en) | Ammonia injection grille device for flue gas denitration adopting SCR method | |
| CN110180386A (en) | A kind of flue gas spiral diffusion denitrification apparatus and method of denitration | |
| CN212523621U (en) | Three wastes stove flue gas denitration minimum discharge structure | |
| CN207025089U (en) | A kind of ammonia system processed that urea pyrolysis is directly realized using high temperature flue-gas from boiler | |
| CN209917610U (en) | SNCR deNOx systems | |
| CN209295091U (en) | One kind being used for the external gas bypass economizer system of boiler SCR denitration | |
| CN103432905A (en) | Catalytic reduction type de-nitrification reactor of circulating fluidized bed | |
| CN213725792U (en) | SCR deNOx systems inner structure | |
| CN206168207U (en) | High -efficient SNCR deNOx systems's of W flame furnace spray gun arrangement structure | |
| CN2892253Y (en) | Flue denitrator setting under boiler coal saver of spraying ammine grid | |
| CN106051803B (en) | Smoke eliminator and the chain-grate boiler for being equipped with the device | |
| CN205606614U (en) | SCR method economizer water side is hung a tub bypass flue gas and is carried warm device | |
| CN210021742U (en) | A embedded SCR flue gas denitration reactor among exhaust-heat boiler for denitration of cement kiln flue gas | |
| CN209735350U (en) | Flue gas mixing and turbulence device | |
| CN210410145U (en) | SNCR device using spray gun cooling water as dilution water | |
| CN107051191A (en) | The efficient SCR denitration structures and methods that a kind of achievable full load puts into operation | |
| CN207805389U (en) | Cigarette temperature raising denitrification apparatus is mixed in a kind of stove | |
| CN210125301U (en) | SCR denitrification facility | |
| CN206965519U (en) | A kind of SCR denitration reactor for optimizing flow of flue gas | |
| CN112452147A (en) | SCR denitration system internal structure and design method thereof | |
| CN208542046U (en) | A kind of SCR inlet flue gas subregion mixing arrangement | |
| CN203447986U (en) | Catalytic reduction-method denitration reactor of circulating fluidized bed | |
| CN217855505U (en) | Denitration induced draft structure of styrene steam superheater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |