CN209612602U - The system of low-concentration nitrogen oxide ozone efficient oxidation in a kind of flue gas - Google Patents

Abstract

This is practical to disclose a kind of system of low-concentration nitrogen oxide ozone efficient oxidation in flue gas, including ozone generator, flue, the flue outlet access spray column, further includes that equal mixing device, secondary equal mixing device are strengthened in dilution air, static mixer, injection；It includes main pipe and several branch pipes connecting with main pipe that equal mixing device is strengthened in the injection, branch pipe is set in flue, connection has the closed short distance branch pipe of cecum on every branch pipe wall, several injection pipes for having ozone nozzle are connected on short distance branch pipe, and main pipe is connected to the mixed gas outlet pipe of static mixer；Static mixer air inlet is separately connected ozone generator and dilution air；Equal mixing device downstream is strengthened in the injection that secondary equal mixing device is set in flue.Preferably, the secondary equal mixing device includes several support pipes for being fixed on flue sidewall, and several pairs of cross-fixings are fixed in every support pipe in the turbulence blades in support pipe.

Description

The system of low-concentration nitrogen oxide ozone efficient oxidation in a kind of flue gas

Technical field

The utility model relates to a kind of system of low-concentration nitrogen oxide efficient removal in flue gas more particularly to a kind of flue gases The system of middle low-concentration nitrogen oxide ozone efficient oxidation.

Background technique

SCR denitration technology applies wider denitrating flue gas Treatment process since higher denitration efficiency becomes at present；But When unit load rate is lower, SCR denitration system inlet flue gas temperature is too low to cause denitrating system that cannot put into operation；If at low load, by force The SCR denitration spray ammonia system that puts into operation is made, the escaping of ammonia is higher to will increase the clogs risk such as downstream installation air preheater；It is current simultaneously SCR denitration system results in a series of corruption of subsequent heat exchange element because its higher denitration efficiency produces higher the escaping of ammonia The problems such as erosion, blocking, to mitigate SCR denitration system denitration pressure, that is, lowers its denitration efficiency, SCR denitration system can be improved and go out NOx concentration remaining in flue gas is further reduced to small by mouthful NOx concentration by the technique of ozone oxidation combination wet sprinkling In country or local discharge standard concentration；Or the technique can be combined to realize that NOx is lower in flue gas by low nitrogen burning, SNCR, SCR The discharge of concentration.

For the gas fired-boiler or gas turbine group of peak regulation, can be lower than using discharged nitrous oxides concentration after low nitrogen burning 100mg/m3, but be difficult to meet increasingly strict local environmental protection standard requirement, if the reproducibilities gas denitrifying technology such as coupling SCR It needs to carry out biggish transformation to original system, the operation of original system normal reliable is influenced, simultaneously because gas turbine operation is special Property --- mainly as peaking power source, load fluctuation is big, heat-transfer surface smoke temperature fluctuation in tail portion is big, leads to SCR denitration fluctuation of service, So as to cause a series of environment friendly system operation problems such as NOx emission fluctuation of concentration is big, the escaping of ammonia is big.

To solve these problems, producer more at present selects oxidizing and denitrating ozone method, using nitrogen in ozone oxidation flue gas Oxide is then again by the denitration of spray column spray washing, as shown in Chinese patent CN201620428964.0, but current city Ozone/NOx molar ratio deviation of ozone injection grid injection is larger, leads to that ozone utilization rate is low, system operation energy consumption is higher, It will lead to higher ozone escape simultaneously, energy consumption is higher while increasing secondary pollution.

Utility model content

In view of the deficiencies of the prior art, the utility model provides the efficient oxygen of low-concentration nitrogen oxide ozone in a kind of flue gas The system of change, it is intended to solve ozone in existing oxidizing and denitrating ozone device mixed with low-concentration nitrogen oxide in flue gas it is non-uniform Problem.

To achieve the above object, the utility model provides the following technical solutions: low-concentration nitrogen oxide is high in a kind of flue gas The system for imitating removing, including ozone generator, flue, the flue outlet access spray column, further include dilution air, static mixed Equal mixing device, secondary equal mixing device are strengthened in clutch, injection；

It includes main pipe and several branch pipes connecting with main pipe that equal mixing device is strengthened in the injection, and branch pipe is set in flue, often Connection has the closed short distance branch pipe of cecum on root branch pipe wall, several sprays for having ozone nozzle are connected on short distance branch pipe Pipe is penetrated, and main pipe is connected to the mixed gas outlet pipe of static mixer；Static mixer air inlet is separately connected ozone Device and dilution air；

Equal mixing device downstream is strengthened in the injection that secondary equal mixing device is set in flue.

Preferably, the secondary equal mixing device includes several support pipes for being fixed on flue sidewall, every support pipe On be fixed with several pairs of cross-fixings in the turbulence blades in support pipe.

In order to strengthen mixed process, two pairs of cross-fixings are installed in disturbing in support pipe in the every support pipe Blade is flowed, four pairs of turbulence blades in adjacent two support pipes rotate distribution in a ring；Mixed gas is removed disturbs by every group It flows outside the local eddy currents that blade is formed, adjacent four pairs of turbulence blades and peripheral the turbulence blades shape on flue gas flow direction inwardly At contrary double vortex flow, mixed process is enhanced, is uniformly distributed ozone；

Preferably, the turbulence blades and flue gas flow direction it is at 45 °~60 ° of angles, turbulence blades be preferably shaped to diamond shape or The shape of a hoof, material is using 304 or 316L etc..

In order to improve the arrangement sealing of nozzle to greatest extent, the branch pipe is laterally vertically connected at main pipe, closed cross It is inserted into flue, the spacing between adjacent branch pipe is between 500mm~1000mm, every branch pipe end-enclosed, longitudinally hangs down on branch pipe Direct-connected to be connected to short distance branch pipe, for short distance branch length of tube in 100mm~200mm, short distance branch pipe side annular has 2~6 to have ozone The injection pipe of nozzle 1, angle is between 45 °~120 ° between injection pipe.

Preferably, the ozone nozzle is ellipse, spiral shape or round nozzle.

Preferably, the dilution air selects centrifugal high pressure fan.

Preferably, the spray tower bottom is equipped with the pond of the solution containing alkaline matter or slurries, and pond is by following The spray tube of ring pump connection tower body.

The nitrogen in molecular sieve absorption air can be used in oxygen preparation process in ozone generation system, and do not inhaled After oxygen in attached air is by setting oxygen compressor and regulator processing, gas pressure is adjusted to 0.2Mpa or so, oxygen Concentration is greater than 90%, is dusted filtering using oxygen filter, and be sent into after voltage-regulating and voltage-stabilizing device pressure stabilizing to 0.1Mpa The ozone generator；All ozone contact the stainless steel materials such as pipe material all 304 or 316L.

The utility model has the beneficial effects that

(1) ozone conveying main pipe, branch pipe, short distance branch pipe, injection pipe, nozzle multistage arrangement, do not increase hybrid system entirety Under the premise of weight, the layout density of nozzle is improved to greatest extent, while reducing the flue gas resistance of the device, is improved smelly The short distance mixing uniformity of low-concentration nitrogen oxide in oxygen and flue gas；

(2) disturbing flow device at rear portion can form strong inverse double-rotation stream whirlpool, enhance mixed process, divide ozone uniformly Cloth controls desulfurizing tower front entrance section ozone concentration distribution standard deviation RSD less than 0.3, improves denitration efficiency；

(3) it can be coupled with gas fired-boiler low-NO_x combustion technology, it is not necessary to using the more complex SNCR of system or SCR denitration Technology；Existing SCR can also be coupled or SCR denitration technology realizes stringenter emission limit requirement, and then realize and save Reduce the purpose of system investment in place；It can make up under existing denitration technology underload that denitration efficiency is low to be difficult to stably reaching standard simultaneously Defect；

(4) it is remarkably improved nitrogen oxides efficiency when same ozone amount, reduces energy consumption；

(5) 90% or more denitration efficiency when not coupling other denitration technologies, can when coupling other gas denitrifying technologies Stablize and realizes that discharged nitrous oxides concentration is lower than 10mg/m3.

Detailed description of the invention

Fig. 1 is the system flow structural schematic diagram of the utility model.

Fig. 2 is that the layout drawing of equal mixing device is strengthened in the injection of the utility model.

Fig. 3 is the short distance branch pipe top nozzle form schematic diagram of the utility model.

Fig. 4 is the structure arrangement schematic diagram of the secondary equal mixing device of the utility model.

Specific embodiment

As shown in Figure 1,2,3, 4, in a kind of flue gas low-concentration nitrogen oxide ozone efficient oxidation system, including ozone hair Life device 1, flue 6, the outlet of the flue 6 access spray column 2, further include dilution air 3, static mixer 4, spray and strengthen Mixing device 5, secondary equal mixing device 7；The dilution air 3 selects centrifugal high pressure fan；2 bottom of spray column, which is equipped with, contains alkali Property the solution of the substance or pond of slurries, pond passes through the spray tube that circulating pump connects tower body；

It includes main pipe 8 and several branch pipes 9 connecting with main pipe 8 that equal mixing device 5 is strengthened in the injection, and branch pipe 9 is set to flue In 6, connection has the closed short distance branch pipe 12 of cecum on every 9 tube wall of branch pipe, is connected with several on short distance branch pipe 12 and has The injection pipe 13 of ozone nozzle 10, and main pipe 8 is connected to the mixed gas outlet pipe of static mixer 4；4 air inlet of static mixer Mouth is separately connected ozone generator 1 and dilution air 3；

Equal 5 downstream of mixing device is strengthened in the injection that secondary equal mixing device 7 is set in flue 6.The secondary equal mixing device 7 includes Several support pipes 71 for being fixed on 6 side wall of flue are fixed with several pairs of cross-fixings in every support pipe 71 and hold round in branch Turbulence blades 72 on pipe 71.The turbulence blades 72 and flue gas flow direction be at 45 °~60 ° of angles, 72 shape of turbulence blades is preferred For diamond shape or the shape of a hoof, material is using 304 or 316L etc..

The branch pipe 9 is laterally vertically connected at main pipe 8, closed horizontal insertion flue 6, and the spacing between adjacent branch pipe 9 exists Between 500mm~1000mm, every 9 end-enclosed of branch pipe is longitudinally perpendicular on branch pipe 9 to be connected with short distance branch pipe 12, short distance branch pipe For 12 length in 100mm~200mm, 12 side annular of short distance branch pipe has 2~6 injection pipes 13 for having ozone nozzle 10, injection Angle is between 45 °~120 ° between pipe 13.The ozone nozzle 10 is ellipse, spiral shape or round nozzle.

The turbulence blades 72 and flue gas flow direction be at 45 °~60 ° of angles, turbulence blades 72 are preferably shaped to diamond shape or horseshoe Shape, material is using 304 or 316L etc..

The dilution air 3 selects centrifugal high pressure fan.

Working principle: the ozone that ozone generator 1 generates is sent into static mixer 4, is blasted largely by dilution air 3 Air enters static mixer 4, reaches fine dispersion and well-mixed purpose between different fluid, reduces ozone concentration, mentions To ozone utilization rate, reduces ozone and overflow；

Ozone after premixing enters the main pipe 8 that equal mixing device 5 is strengthened in injection by the outlet of static mixer 4, mixes smelly Oxygen flows through several branch pipes 9, short distance branch pipe 12, injection pipe 13 and is ejected in flue 6 from ozone nozzle 10, and to be processed containing is low dense The nitrogen oxide containing gas of degree is delivered to spray column 2 by flue 6；By main pipe 8, branch pipe 9, short distance branch pipe 12, injection pipe 13 and The multistage arrangement of ozone nozzle 10, improves the layout density of ozone nozzle 10 to greatest extent, it is low with flue gas to improve ozone The short distance mixing uniformity of concentration nitrogen oxides；Raising ozone utilization rate is low, reduces system operation energy consumption.

Ozone concentration in main pipe air-flow: 2000~20000ppm, nitrogen oxides in effluent concentration: 20~200ppm, due to The ozone of penetrating differs greatly with the nitrous oxides concentration of low concentration in flue gas, to make the ozone sprayed into a short time It is uniformly mixed, then ozone nozzle must be encrypted with the nitrogen oxides in flue gas.After nozzle encryption, ozone/NOx moles is dense Degree is substantially reduced than distribution RSD, is remarkably improved the mixing uniformity for spraying into low-concentration nitrogen oxide in ozone and flue gas, can be shown The utilization rate for improving and spraying into ozone is write, energy consumption is reduced.It is arranged by multilevel branch pipe, does not increase hybrid system overall weight premise Under, the layout density of nozzle is improved to greatest extent, while reducing the flue gas resistance of the device, improve ozone and flue gas The short distance mixing uniformity of middle low-concentration nitrogen oxide；

To further enhance ozone/flue gas even distribution, raising ozone utilization rate is low, reduces system operation energy consumption, Pass through several 71 arranged crosswise turbulence blades 72 of row's support pipe, gaseous mixture in the flue 6 that equal 5 downstream of mixing device is strengthened in injection Body is uniformly distributed in the local eddy currents formed by every group of turbulence blades 72, ozone；Then flue gas enters spray column 2 through basic species The efficient removal of nitrogen oxides is realized after the solution or slurries spray-absorption of matter.

The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this Made any modification, equivalent replacement or improvement etc., should be included in the utility model within the spirit and principle of utility model Protection scope within.

Claims (8)

1. the system of low-concentration nitrogen oxide ozone efficient oxidation in a kind of flue gas, including ozone generator (1), flue (6), institute State flue (6) outlet access spray column (2), which is characterized in that further include dilution air (3), static mixer (4), spray by force Change equal mixing device (5), secondary equal mixing device (7)；

It includes main pipe (8) and several branch pipes (9) connecting with main pipe (8) that equal mixing device (5) is strengthened in the injection, and branch pipe (9) is set In flue (6), connection has the closed short distance branch pipe (12) of cecum on every branch pipe (9) tube wall, and short distance branch pipe connects on (12) Several injection pipes (13) for having ozone nozzle (10) are connected to, and main pipe (8) is connected to the gas outlet of static mixer (4)； Static mixer (4) air inlet is separately connected ozone generator (1) and dilution air (3)；

Equal mixing device (5) downstream is strengthened in the injection that secondary equal mixing device (7) is set in flue (6).

2. according to claim 1 in a kind of flue gas low-concentration nitrogen oxide ozone efficient oxidation system, which is characterized in that The secondary equal mixing device (7) includes several support pipes (71) for being fixed on flue (6) side wall, on every support pipe (71) Several pairs of cross-fixings are fixed in the turbulence blades (72) on support pipe (71).

3. according to claim 2 in a kind of flue gas low-concentration nitrogen oxide ozone efficient oxidation system, which is characterized in that Two pairs of cross-fixings are installed in the turbulence blades (72) on support pipe (71) on the every support pipe (71), adjacent two Four pairs of turbulence blades (72) in root support pipe (71) rotate distribution in a ring.

4. the system of low-concentration nitrogen oxide ozone efficient oxidation, feature exist in a kind of flue gas according to Claims 2 or 3 In, turbulence blades (72) and flue gas flow direction it is at 45 °~60 ° of angles, turbulence blades (72) shape is diamond shape or the shape of a hoof, material Matter is using 304 or 316L etc..

5. according to claim 1 in a kind of flue gas low-concentration nitrogen oxide ozone efficient oxidation system, which is characterized in that The branch pipe (9) is laterally vertically connected at main pipe (8), closed horizontal insertion flue (6), and the spacing between adjacent branch pipe (9) exists Between 500mm~1000mm, every branch pipe (9) end-enclosed is longitudinally perpendicular on branch pipe (9) to be connected with short distance branch pipe (12), short Away from branch pipe (12) length in 100mm~200mm, short distance branch pipe (12) side annular has 2~6 sprays for having ozone nozzle (10) It penetrates pipe (13), angle is between 45 °~120 ° between injection pipe (13).

6. the system of low-concentration nitrogen oxide ozone efficient oxidation, feature exist according to claim 1 or in a kind of 5 flue gases In the ozone nozzle (10) is ellipse, spiral shape or round nozzle.

7. according to claim 1 in a kind of flue gas low-concentration nitrogen oxide ozone efficient oxidation system, which is characterized in that The dilution air (3) selects centrifugal high pressure fan.

8. according to claim 1 in a kind of flue gas low-concentration nitrogen oxide ozone efficient oxidation system, which is characterized in that Spray column (2) bottom is equipped with the pond of the solution containing alkaline matter or slurries, and pond connects tower body by circulating pump Spray tube.