CN206199012U - Flue gas denitrification system ammonia pretreatment system - Google Patents
Flue gas denitrification system ammonia pretreatment system Download PDFInfo
- Publication number
- CN206199012U CN206199012U CN201620864368.7U CN201620864368U CN206199012U CN 206199012 U CN206199012 U CN 206199012U CN 201620864368 U CN201620864368 U CN 201620864368U CN 206199012 U CN206199012 U CN 206199012U
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- Prior art keywords
- ammonia
- flue gas
- guide vane
- blender body
- outlet
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 271
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 127
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 239000003546 flue gas Substances 0.000 title claims abstract description 32
- 239000007789 gas Substances 0.000 claims abstract description 42
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000009530 blood pressure measurement Methods 0.000 claims description 6
- 238000009529 body temperature measurement Methods 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 230000008676 import Effects 0.000 claims description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 9
- 239000000203 mixture Substances 0.000 abstract description 5
- 230000006641 stabilisation Effects 0.000 abstract description 5
- 238000011105 stabilization Methods 0.000 abstract description 5
- 238000010790 dilution Methods 0.000 abstract description 3
- 239000012895 dilution Substances 0.000 abstract description 3
- 238000002309 gasification Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000007792 gaseous phase Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The utility model provides a kind of flue gas denitrification system ammonia pretreatment system, including：One liquid ammonia vaporising device and an ammonia air mixing device.Industrial ammonia can be made quickly, safely and steadly turns into temperature stabilization, advantageously the ammonia air gas mixture of even concentration, it is ensured that denitrating system and main factory's host computer system energy stable operation, guarantee denitration outlet drain nitrogen oxides qualified discharge by gasification, dilution.
Description
Technical field
The utility model is related to environmental technology field, more particularly to denitrating flue gas processing technology field, and in particular to a kind of
Flue gas denitrification system ammonia pretreatment system.
Background technology
The boiler for using fossil fuel (such as coal, oil, natural gas) produces substantial amounts of flue gas, and nitrogen oxides is contained in flue gas
(NOx) harmful substance such as, NOx is a kind of greenhouse gases, can be damaged the ozone layer.Direct harm to health；Participate in being formed
Photochemical fog, forms acid rain, causes environmental pollution；In order to reduce the harm that NOx is caused to environment and the mankind, country is to boiler
The NOx emission concentration in flue gas is produced to propose more stringent requirement.In order to realize the discharge of NOx lower concentrations, mitigate and
Harm of the NOx to the mankind is eliminated, before boiler smoke is discharged into atmospheric environment, typically by equipment for denitrifying flue gas removing
Most of NOx in flue gas.
State Development and Reform Commission prints and distributes《Coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014-2020)》Air of keeping under strict control is dirty
Dye thing discharge.Newly-built Thermal generation unit (be contained in build and included the unit that national construction of fire and electricity is planned with project) answers synchronized construction
Advanced NO_x Reduction by Effective facility, must not set gas bypass passage, newly-built, transformation Thermal generation unit denitration pollution thing concentration of emission
Limit value (i.e. under the conditions of benchmark oxygen content 6%, discharged nitrous oxides concentration 50 milligram/cubic metre not high).Eastern region (the Liao Dynasty
Rather, the provinces and cities of Beijing, Tianjin, Hebei, Shandong, Shanghai, Jiangsu, Zhejiang, Fujian, Guangdong, Hainan etc. 11) newly-built Thermal generation unit
Air Pollutant Emission concentration basically reach gas turbine group emission limit (i.e. under the conditions of benchmark oxygen content 6%, flue dust, two
Sulfur oxide, discharged nitrous oxides concentration are respectively no higher than 10,35,50 milligrams/cubic metre).Middle part (Heilungkiang, Jilin, mountain
The province of west, Anhui, Hubei, Hunan, Henan, Jiangxi etc. 8) new-built unit in principle close to or up gas turbine group emission limit,
West area new-built unit is encouraged close to or up gas turbine group emission limit.Support that synchronous atmosphere pollution joint of carrying out is assisted
With removing, the pollutant emissions such as sulfur trioxide, mercury, arsenic are reduced.
In denitrating flue gas processing method, SCR methods are a kind of most widely used methods, it have treatment exhaust gas volumn it is big,
Efficiency high, it is stable the advantages of.SCR methods are that the catalyst required for denitration reaction is arranged in into boiler tail, flue-gas temperature
The general flue region at 290-420 DEG C.Flue gas is filled before by catalyst with the reducing agent (generally ammonia) sprayed into flue
Divide mixing, when flue gas passes through catalyst, the NOx in flue gas in the presence of catalyst reacts with reducing agent ammonia, generate nothing
Harmful N2And water, so that the NOx in removing flue gas.
During denitration reaction, ammonia is essential as reducing agent.But the aerial volumetric concentration of ammonia reaches
During to 16~25%, the flammable explosive mixture of II classes can be formed, there is very big potential safety hazard.In addition, existing industry
The raw material state of ammonia is often liquid.
Therefore, become into, it is necessary to pre-processed, being gasified to ammonia, being diluted before denitrating system in ammonia
The ammonia air gas mixture of temperature, concentration stabilization.Although existing denitrating system common configuration pretreatment system, is present
Some shortcomings.
Utility model content
Regarding to the issue above, the purpose of this utility model is to provide a kind of flue gas denitrification system ammonia pretreatment system,
Industrial ammonia can be made quickly, safely and steadly turns into temperature stabilization, the ammonia air mixing of even concentration by gasification, dilution
Gas, it is ensured that denitrating system and main factory's host computer system energy stable operation, advantageously ensures that denitration outlet drain nitrogen oxides is up to standard
Discharge.
It is that, up to above-mentioned purpose, the utility model is adopted the technical scheme that：
A kind of flue gas denitrification system ammonia pretreatment system, including：
One liquid ammonia vaporising device, an ammonia air mixing device；
The liquid ammonia vaporising device includes：One evaporator body, with the cavity for accommodating medium；It is arranged on the steaming
The hair intrinsic liquefied ammonia heat exchanger of device；Described liquefied ammonia heat exchanger one end is connected with liquefied ammonia import, the other end be arranged on evaporation
The intrinsic device for collecting ammonia gas of device is connected, and the device for collecting ammonia gas is provided with gas ammonia outlet and an at least safe release
Gas vent, is separately positioned on the steam heating injection apparatus in cavity；The steam heating injection apparatus connects a steam
Inlet duct, the steam inlet duct is provided with an adjusting means；The adjusting means is all connected with a control system；
The ammonia air mixing device includes：One blender body, the side of the blender body connects an air
Entrance, opposite side connects mixed gas outlet section；Stretch into the blender body and near the one of air intake section
Ammonia jet pipe, the injection direction of the ammonia jet pipe points to the mixed gas outlet, and the outlet section of ammonia jet pipe with it is described
Blender body axis is unanimously and positioned at the center of blender body；The inwall of the blender body is provided with polylith and leads
Stream blade, the guide vane distinguishes interlaced arrangement in the both sides of the blender body；The guide vane is not mixed with described
The edge of the side of the inwall connection of clutch body has uniform multiple elongated slots；
The gas ammonia outlet is connected to an arrival end of an ammonia surge tank, the port of export connection institute of the ammonia surge tank
State ammonia jet pipe.
Further, also including being arranged at the liquid level emasuring device and medium temperature measurement apparatus of the evaporator body；
It is arranged at the device for pressure measurement and ammonia temperature measuring equipment of the gas ammonia outlet；The liquid level emasuring device, medium temperature
Measurement apparatus, device for pressure measurement and ammonia temperature measuring equipment are connected with the control system signal.
Further, the control system is a DCS (Distributed Control System distributed AC servo systems systems
System).
Further, the liquefied ammonia heat exchanger is a coil exchanger, and the coil exchanger uses external finned tube
As coil pipe.
Further, the side wall of the evaporator body is provided with overflow outlet, the evaporator near the position at top
The bottom of body is provided with a blow-off pipe.
Further, the guide vane has angle with the inwall shape of the blender body, the angle of the angle
Degree scope is 60 ° to 90 °.
Further, the axial spacing between the adjacent guide vane is equal, is the width of the blender body
0.45 to 0.65 times of degree or diameter.
Further, the axial spacing between the guide vane nearest apart from the spout of ammonia jet pipe is blender body
The 7.5% to 15% of width or diameter.
Further, the benchmark spacing between the two panels guide vane nearest apart from the nozzle of the ammonia jet pipe is mixed
The width of clutch body or 0.45 to 0.65 times of diameter；Spacing between the adjacent guide vane along ammonia jet pipe spray
Penetrate direction to increase successively, the length for increasing successively is the 10% to 15% of the benchmark spacing.
Further, the fluting quantity of the elongated slot is 12 to 25 on guide vane described in monolithic；The elongated slot
Length for blender body width or diameter 5% to 8%, the width of the elongated slot is 1mm to 3.5mm.
By taking above-mentioned technical proposal, with steam water-bath, electrical heating water-bath collectively as liquefied ammonia evaporating device, you can mutually
For standby, it is ensured that the stabilization supply of gas ammonia, also can simultaneously use, the two complements each other, improve energy utilization rate, energy-conserving and environment-protective,
Reduce production cost.And air ammonia is uniformly mixed with the guide vane of simple structure, by rationally setting guide vane
The parameters such as angle of inclination, arrangement spacing, you can obtain preferable flow-disturbing effect, pressure drop can be effectively reduced again, so as to obtain optimal
Balance.In addition, the through hole for being opened in guide vane edge can not only avoid blender body inwall annex from dead angle occur, so that
More preferably flow-disturbing effect is obtained, and can avoid accumulating impurity or drop etc. in the installation junction of guide vane, realized automatic clear
Sweep, clearing function, reduce safeguard frequency and cost.In addition, opening up elongated slot, blender body center can be quickly broken up
Ejection ammonia, advantageously in ammonia, the uniform mixing of air.
To sum up, can be denitrating system stabilization, peace by flue gas denitrification system of the present utility model ammonia pretreatment system
Entirely, the reducing agent ammonia of even concentration is reliably provided.
Brief description of the drawings
Fig. 1 is that the structure arrangement of the flue gas denitrification system ammonia pretreatment system in the embodiment of the utility model one is illustrated
Figure.
Fig. 2 is the structural representation of the liquid ammonia vaporising device in the embodiment of the utility model one.
Fig. 3 is the overlooking surface structural representation of the ammonia air mixing device in the embodiment of the utility model one, has done section view
Treatment.
Fig. 4 is the side structure schematic diagram of the ammonia air mixing device in the embodiment of the utility model one, has done part
Section view treatment.
Fig. 5 is the structural representation of the ammonia jet pipe in the embodiment of the utility model one.
Fig. 6 be Fig. 5 in A-A to generalized section.
Fig. 7 is the generalized section of B-B direction in Fig. 4.
Fig. 8 is the structural representation of the guide vane in the embodiment of the utility model one.
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clear, complete description.
As described in Figure 1, in one embodiment, there is provided a kind of flue gas denitrification system ammonia pretreatment system, including：Liquid ammonia
Vaporising device 100, ammonia air mixing device 300, the diluent air for providing system air to ammonia air mixing device is supplied
Device 200, such as schemes, generally one or more groups dilution airs.
With reference to shown in Fig. 1 and Fig. 2, liquid ammonia vaporising device 100 includes：Evaporator body 104, with receiving medium W (
As be warm water) a cavity；It is arranged on the liquefied ammonia heat exchanger 108 in evaporator body 104；The one end of liquefied ammonia heat exchanger 108 with
Liquefied ammonia import is connected, and the other end is connected with the device for collecting ammonia gas 106 being arranged in evaporator body 104, and ammonia is collected
Device is provided with gas ammonia outlet 105 and at least one safe release gas vent 107, is separately positioned on the electric heater in cavity
102 and one steam heating injection apparatus 101；The power of electric heater 102 is regulated and controled by a control and regulation switch；Steam adds
Thermal spray equipment 101 connects a steam inlet duct, and it (is regulation manually as schemed that steam inlet duct is provided with an adjusting means
The valve group of valve, automatic regulating valve and diaphragm valve composition)；Control to adjust switch and adjusting means is all connected with a control system (figure
Do not show)；
Wherein, liquid ammonia evaporating device 100 also includes being arranged at the liquid level emasuring device and medium temperature of the evaporator body
Degree measurement apparatus；It is arranged at the device for pressure measurement and ammonia temperature measuring equipment of the gas ammonia outlet；The level gauging dress
Put, medium temperature measurement apparatus, device for pressure measurement and ammonia temperature measuring equipment are connected with the control system signal.
Liquefied ammonia heat exchanger 108 is a coil exchanger, in certain embodiments, in order to improve heat exchange efficiency, coiled
Heat exchanger is using external finned tube as coil pipe.
The side wall of evaporator body 104 is provided with overflow outlet near the position at top, and the bottom of evaporator body 104 sets
There is a blow-off pipe 103.
Control system is a DCS (Distributed Control System dcs), in the configuration of main factory
During denitration desulphurization system, remote control is generally carried out to each part of processing system using DCS, its concrete function is
Prior art, will not be repeated here.
By above-mentioned liquid ammonia evaporating device, steam is passed directly into evaporator body water-bath, and the water in heated water bath body is (logical
It it is often 75 DEG C~85 DEG C).Unnecessary water is gone out by overfall overflow, and coil exchanger is immersed in the hot water of water-bath, is inhaled
The heat for receiving hot water gasifies and overheats, and collects in gas ammonia collection device, and by the drop of Gravity Separation entrainment, it is complete
The ammonia of full gasification overheat is delivered to ammonia surge tank.
Pneumatic cut-off valve is provided with evaporator liquefied ammonia entrance, when the transmitter temperatures and gaseous state of the measurement water temperature in water-bath
Ammonia outlet temperature transmitter measurement gas phase temperature is above the lower bound of setting, and the liquid-level switch of gas ammonia collection device is not reported
Alert, entrance stop valve is opened, and liquid ammonia enters evaporator in evaporator and starts working.Steam inlet is provided with pneumatic control valve,
Pneumatic control valve calculates the aperture for automatically adjusting valve according to bath temperature by DCS, it is ensured that scope of the bath temperature in setting
It is interior, the outlet of ammonia is all gasified and on the lower bound temperature of setting.Any one appearance in having following alarm,
Evaporator meeting sound and light alarm simultaneously cuts off inlet valve：
1. bath temperature lower bound；
2. ammonia outlet gas phase temperature lower bound；
3. central tube liquid-level switch alarm.
Safety valve is provided with evaporator outlet simultaneously, the harm that superpressure is caused is prevented, it is ensured that safety.
Water temperature is controlled by the circulating start and outage of electric heater (to lead in the working range set in user by automatically controlling
It it is often 75 DEG C~85 DEG C).When water level less than user setting lower-limit point when, no matter water temperature just, electric heater stop heating
To prevent dry combustion method.Evaporator is provided with safety valve, and when pressure superelevation, safety valve is diffused.When gaseous phase outlet temperature is less than setting
Value, instruction is sent by DCS, and the cut-out of liquefied ammonia entrance stop valve prevents liquefied ammonia from being overflowed from gaseous phase outlet.Control mode is controlled for packet
System, packet controlled investment expense is few, might as well be realized in control, and service life of equipment is long.
As shown in Figures 3 and 4, denitration ammonia air mixing device, including：
Blender body 301, the side connection air intake section 304 of the blender body, air intake section 304 is connected
Air intake 308；Opposite side connection mixed gas outlet section 306；Mixed gas outlet section 306 connects mixed gas outlet 310；
Stretch into blender body 301 and near the ammonia jet pipe 302 of air intake section 304, the injection side of ammonia jet pipe 302
To point to mixed gas outlet 306, and ammonia jet pipe 303 outlet section it is consistent with the axis of blender body 301 and positioned at mix
The center of device body 301；Such as Fig. 4, ammonia jet pipe 302 includes the ammonia entrance 309, the elbow linkage section that are sequentially connected
307 and ammonia spray section 303.With reference to Fig. 5 and Fig. 6, the end for spraying section 303 in ammonia has a main injection jet, is sprayed in ammonia
The side wall of section 303 uniformly opens up multiple auxiliary spray holes.
The inwall of blender body 301 is provided with polylith guide vane 305, and guide vane 305 distinguishes interlaced arrangement in mixed
The both sides of clutch body 301；
The edge of the side being connected with the inwall of blender body 301 in each guide vane 305 has a through hole；Water conservancy diversion
The edge of the side that blade 305 is not connected with the inwall of blender body 301 has uniform multiple elongated slots.
Wherein, each guide vane 305 forms an angle α, the angular range of angle α with the inwall of blender body 301
It is 60 ° to 90 °, preferably 75 °.
Axial spacing between adjacent guide vane 305 is equal, is the width or diameter of blender body 301
0.45 to 0.65 times.Axial spacing between the guide vane nearest apart from the spout of ammonia jet pipe 302 is blender body
The 7.5% to 15% of width or diameter.
In further embodiments, the benchmark spacing between two panels guide vane nearest apart from the nozzle of ammonia jet pipe
It is the width of blender body or 0.45 to 0.65 times of diameter；Spacing between the adjacent guide vane is along ammonia jet pipe
Injection direction increase successively, the length for increasing successively is the 10% to 15% of the benchmark spacing.Because the ammonia of injection
Gas and air and the mixed gas of the two are gradually reduced along the pressure of injection direction institute band, the spacing phase between guide vane
Should incrementally increase, adapt to this kind of pressure trend, be more beneficial for reducing the overall pressure drop of device.
In other embodiments, the quantity of through hole is not limited to one, generally odd number, no more than 7, along guide vane with
The edge of the side of the inwall connection of the blender body is uniform.The perforated area of all through holes is the 1.5% of inner wall section
To 3.5%.Calculated according to simulation softward, this percent opening does not interfere with flow-disturbing mixed effect, and can effectively prevent guide vane
Accumulate debris in junction with inwall.
With reference to Fig. 7 and Fig. 8, the fluting quantity of elongated slot is 12 to 25 on monolithic guide vane.The length of elongated slot is
The width of blender body or the 5% to 8% of diameter, the width of elongated slot is 1mm to 3.5mm.By these elongated slots, can be with
The most strong ammonia of combing blender body radial direction middle section pressure, wind speed, air and the mixed gas of the two, are promoting to mix
On the basis of, while reducing overall pressure drop.
In some other embodiment, the length of the elongated slot opened up on each guide vane and the guide vane and the ammonia
The distance of gas blowout pipe is in inverse ratio.Similarly, since the ammonia and air and the mixed gas of the two of injection are along injection direction institute band
Pressure gradually reduce, the length of elongated slot then accordingly progressively shortens, and adapts to this kind of pressure trend, is more beneficial for drop
The overall pressure drop of low device.
By taking above-mentioned technical proposal, the guide vane by simple structure is that to can reach be that air ammonia uniformly mixes
Purpose.And by rationally setting the angle of inclination of guide vane, arranging the parameters such as spacing, you can obtain preferable flow-disturbing effect
Really, pressure drop can be effectively reduced again, so as to obtain optimum balance.In addition, the through hole for being opened in guide vane edge can not only be kept away
Exempt from blender body inwall annex and dead angle occur, so as to obtain more preferably flow-disturbing effect, and the installation in guide vane can be avoided
Junction accumulation impurity or drop etc., realize automatic cleaning, clearing function, reduce the frequency and cost safeguarded.In addition, opening up thin
Elongated slot, can quickly break up the ammonia of the ejection of blender body center, advantageously in ammonia, the uniform mixing of air.
Using Fluent flow field simulation softwares, according to the structure building model that above-described embodiment is described, different size is joined
Several ammonia air mixers is simulated, and can obtain preferable mixed effect, and mixed gas uniformity coefficient is good.In addition, in sky
Pressure is detected in gas entrance side and mixed gas outlet side respectively, the more close specification of pressure drop of the device of above-described embodiment description its
The existing ammonia air mixer of his species has reduction in various degree, reduces amplitude 3% to 8%.
Above-mentioned gas ammonia outlet 105 is connected to an arrival end of an ammonia surge tank, the port of export connection ammonia of ammonia surge tank
Gas blowout pipe 302, collectively forms flue gas denitrification system ammonia pretreatment system.
Obviously, described embodiment is only a part of embodiment of the utility model, rather than whole embodiments.It is based on
Embodiment in the utility model, it is all that those of ordinary skill in the art are obtained under the premise of creative work is not made
Other embodiment, belongs to the scope of the utility model protection.
Claims (10)
1. a kind of flue gas denitrification system ammonia pretreatment system, it is characterised in that including：
One liquid ammonia vaporising device, an ammonia air mixing device；
The liquid ammonia vaporising device includes：One evaporator body, with the cavity for accommodating medium；It is arranged on the evaporator
Intrinsic liquefied ammonia heat exchanger；Described liquefied ammonia heat exchanger one end is connected with liquefied ammonia import, the other end be arranged on evaporator sheet
An internal device for collecting ammonia gas is connected, and the device for collecting ammonia gas is provided with gas ammonia outlet and an at least safe release gas
Outlet, is arranged on the steam heating injection apparatus in cavity；The steam heating injection apparatus connects a steam inlet duct,
The steam inlet duct is provided with an adjusting means；The adjusting means is all connected with a control system；
The ammonia air mixing device includes：One blender body, the side of the blender body connects an air intake
Section, opposite side connects mixed gas outlet section；Stretch into the blender body and near an ammonia of air intake section
Jet pipe, the injection direction of the ammonia jet pipe points to the mixed gas outlet, and the outlet section of ammonia jet pipe mixes with described
Device body axis are unanimously and positioned at the center of blender body；The inwall of the blender body is provided with polylith water conservancy diversion leaf
Piece, the guide vane distinguishes interlaced arrangement in the both sides of the blender body；The guide vane not with the blender
The edge of the side of the inwall connection of body has uniform multiple elongated slots；
The gas ammonia outlet is connected to an arrival end of an ammonia surge tank, and the port of export of the ammonia surge tank connects the ammonia
Gas blowout pipe.
2. flue gas denitrification system as claimed in claim 1 ammonia pretreatment system, it is characterised in that also described including being arranged at
The liquid level emasuring device and medium temperature measurement apparatus of evaporator body；Be arranged at gas ammonia outlet device for pressure measurement and
Ammonia temperature measuring equipment；The liquid level emasuring device, medium temperature measurement apparatus, device for pressure measurement and ammonia temperature survey
Device is connected with the control system signal.
3. flue gas denitrification system as claimed in claim 1 ammonia pretreatment system, it is characterised in that the control system is
DCS。
4. flue gas denitrification system as claimed in claim 1 ammonia pretreatment system, it is characterised in that the liquefied ammonia heat exchanger is
One coil exchanger, the coil exchanger is using external finned tube as coil pipe.
5. flue gas denitrification system as claimed in claim 1 ammonia pretreatment system, it is characterised in that the evaporator body
Side wall is provided with overflow outlet near the position at top, and the bottom of the evaporator body is provided with a blow-off pipe.
6. flue gas denitrification system as claimed in claim 1 ammonia pretreatment system, it is characterised in that the guide vane with
The inwall shape of the blender body has angle, and the angular range of the angle is 60 ° to 90 °.
7. flue gas denitrification system as claimed in claim 6 ammonia pretreatment system, it is characterised in that the adjacent water conservancy diversion leaf
Axial spacing between piece is equal, be the blender body width or 0.45 to 0.65 times of diameter.
8. flue gas denitrification system as claimed in claim 1 ammonia pretreatment system, it is characterised in that apart from the spray of ammonia jet pipe
Axial spacing between mouthful nearest guide vane for blender body width or diameter 7.5% to 15%.
9. flue gas denitrification system as claimed in claim 1 ammonia pretreatment system, it is characterised in that apart from the ammonia jet pipe
The nearest two panels guide vane of nozzle between a benchmark spacing for blender body width or diameter 0.45 to 0.65
Times；Spacing between the adjacent guide vane increases successively along the injection direction of ammonia jet pipe, and the length for increasing successively is
The 10% to 15% of the benchmark spacing.
10. flue gas denitrification system as claimed in claim 1 ammonia pretreatment system, it is characterised in that water conservancy diversion leaf described in monolithic
The fluting quantity of the elongated slot is 12 to 25 on piece；The length of the elongated slot is the width or diameter of blender body
5% to 8%, the width of the elongated slot is 1mm to 3.5mm.
Priority Applications (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111551424A (en) * | 2020-05-21 | 2020-08-18 | 国网天津市电力公司电力科学研究院 | Application to SO2Flue gas mixer for concentration measurement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111551424A (en) * | 2020-05-21 | 2020-08-18 | 国网天津市电力公司电力科学研究院 | Application to SO2Flue gas mixer for concentration measurement |
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