CN209612637U - Combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system - Google Patents
Combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system Download PDFInfo
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- CN209612637U CN209612637U CN201822149476.8U CN201822149476U CN209612637U CN 209612637 U CN209612637 U CN 209612637U CN 201822149476 U CN201822149476 U CN 201822149476U CN 209612637 U CN209612637 U CN 209612637U
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Abstract
The utility model discloses combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling systems, including ammonium hydroxide dilution unit, ammonia water spray unit and mixed control unit, ammonia water spray unit is arranged in the gas approach of waste heat boiler, ammonium hydroxide dilution unit, which is connected by ammonium hydroxide distribution pipeline with ammonia water spray unit, to be delivered to ammonia water spray unit with the low concentration ammonium hydroxide that will be mixed to get by high concentration ammonium hydroxide and dilution water and sprays, and mixed control unit is electrically connected to control the concentration and flow of the flow of high concentration ammonium hydroxide and low concentration ammonium hydroxide with ammonium hydroxide dilution unit.The utility model rationally dilutes ammonium hydroxide using dilution water; it reduces ammonia concn and increases ammonium hydroxide total flow; it is set to coincide substantially with the ammonia volume under design conditions; effectively guarantee that the ammonium hydroxide of ammonia water spray gun is evenly distributed, the cooling protection of ammonia water spray gun and ammonia atomization effect, the safe normal table of maintenance unit SCR denitrating flue gas are run.
Description
Technical field
The utility model relates to the environmental technology fields of denitrating flue gas, more particularly, are related to a kind of combustion engine waste heat boiler
SCR denitrating flue gas reducing agent spraying controlling system.
Background technique
As the examination & approval construction of domestic coal-fired power project is more and more difficult, adapts to the fast combustion engine unit of peak regulation and then gradually increase, and
And more combustion engine waste heat boiler uses the cost performance SCR gas denitrifying technology that more preferably ammonium hydroxide directly sprays, which is
Ammonium hydroxide is injected directly into exhaust-heat boiler inlet (combustion engine outlet) flue, ammonium hydroxide is vaporized into ammonia, ammonia using high-temperature flue gas
It is sent to waste heat boiler SCR denitration region after being sufficiently mixed again with flue gas and carries out denitration reaction.The technology and traditional spray
Ammonia grid SCR gas denitrifying technology is compared, and has that system is simple, occupies that waste heat boiler space is few, resistance is small, low energy consumption, just throws
The advantages of money and operating cost save, therefore the deep favor by market and user.
Combustion engine is using cleaner natural gas as fuel, and General N Ox original discharge concentration is in 50mg/Nm3Left and right, with
Conventional coal unit is compared, and original NOx emission has been very low.With being constantly progressive for combustion engine technology, gas turbine performance into
One step is promoted, and NOx original discharge concentration is then greatly reduced, in most cases only 25~35mg/Nm3。
The installed capacity of domestic electrical market is gradually saturated, and the fuel engine power generation load in many places also receives in various degree
Influence, will occur the not full phenomenon of generation load for a long time, the probability for causing unit to run in middle-low load is increasing, with
Simultaneously, the exhaust gas volumn of unit declines therewith, and the NOx discharge in unit hour is also being reduced.
Under normal circumstances, when using ammonium hydroxide as denitrification reducing agent, in order to reduce place capacity, place construction scale, just
Cost of investment and ammonium hydroxide freight, can all select mass concentration is the ammonium hydroxide between 20%~30% as reducing agent, combustion engine
It is no exception that the ammonium hydroxide that waste heat boiler uses directly sprays SCR gas denitrifying technology.
For being uniformly distributed for ammonia water spray, ammonium hydroxide directly sprays SCR gas denitrifying technology would generally be in combustion engine waste heat pot
Furnace gas approach surrounding arranges ammonia water spray gun.Combustion engine HRSG Inlet Duct generally has high-order or two kinds of arrangement forms of low level,
No matter any arrangement form, all can to the ammonia water spray gun in stack base region arrange bring heavy resistance.
If under gas approach high position arrangement condition, although there is more space between stack base surface and ground,
Consider that a large amount of steel constructions for having support flue load are arranged in below flue, common ammonia water spray gun may be hindered in stack base
The normal arrangement in region；If under the conditions of gas approach low position, between stack base surface and ground distance it is very close (with
For 9F combustion engine HRSG Inlet Duct, the distance between stack base surface and ground are generally within 1.3m), without
Remaining space meets the installation of common ammonia water spray gun and day-to-day operation maintenance, low position mode, and also there is flue gas to spread disorder,
The features such as flow field uniformity is poor can be further exacerbated by ammonium hydroxide if being unable to satisfy the accurate arrangement of ammonia water spray gun using conventional spray guns
The inhomogeneities of spray distribution, eventually leading to ammonia can be worse with flue gas mixed effect.
In engineering practice, combustion engine HRSG Inlet Duct inside smoke flow velocity is too fast (by taking 9F combustion engine as an example, to be fired
Cigarette scooter 60m/s in machine HRSG Inlet Duct), cause the accurate arrangement of ammonia water spray gun to bring risk, while user
Also get used to that civil engineering dosage can be greatly decreased using low position mode, reduces initial cost cost, therefore low position side
Formula is highly commended by customers and is selected deeply, and ammonia water spray gun arrangement is caused to be encountered by more difficulties.Ammonia water spray gun in existing situation
Arrangement not only can directly spray SCR gas denitrifying technology to ammonium hydroxide and bring important technical obstacle, can also reduce pushing away for the technology
Wide use value forms very unfavorable situation.In this regard, the reasonable accurate arrangement of ammonia water spray gun directly sprays ammonium hydroxide
It is vital for SCR gas denitrifying technology.
Currently, Environmental Protection in China policy is still very harsh, there is still a need for consider to further decrease NO for combustion engineXDischarge, with regard to market
The upper biggish 9F grades of combustion engine of existing design capacity is run under working condition at full capacity, ammonia volume be all it is considerably less, be difficult
Suitable ammonia water spray gun is selected, as NOx emission is 50mg/Nm before denitration3, denitration efficiency 80%, using the ammonium hydroxide of concentration 20%,
General ammonium hydroxide consumption is no more than 250kg/h, and the ammonium hydroxide flow for being assigned to each branch ammonia water spray gun is only 15~30kg/h.If working as unit
Design capacity is small, unit load and exhaust gas volumn is small and original NOXWhen concentration discharge is low, under the influence of these situations, combustion engine
Ammonia volume needed for waste heat boiler SCR denitrating flue gas will be greatly reduced, and directly spray SCR gas denitrifying technology for ammonium hydroxide
For, the ammonium hydroxide of each branch ammonia water spray gun is uniformly distributed, under the cooling protection of ammonia water spray gun and small flow rate ammonium hydroxide atomization
Effect will be faced with no small difficulty, directly affect ammonia be uniformly distributed, the safe operation of denitration efficiency and denitration.
Utility model content
In order to solve in existing HRSG Inlet Duct physical condition, flue gas flow rate is too fast, combustion engine unit design capacity
Small, original NOx concentration discharges low, unit load and exhaust gas volumn is small and be used for a long time when high concentration ammonium hydroxide, leads to ammonia
Water spray gun arrangement is difficult to carry out, SCR denitrating flue gas ammonia volume is too low and causes ammonia water spray gun in the accurate of gas approach surrounding
Arrangement, the consistency of ammonia water spray gun spray site and actual demand, each branch ammonia water spray gun ammonium hydroxide be uniformly distributed, ammonia water spray gun it is cold
But the problem of technical requirements such as atomizing effect of ammonium hydroxide are all difficult to ensure under protection and small flow rate, the utility model is intended to mention
For it is a kind of realize spray gun reasonable Arrangement, ammonium hydroxide be uniformly distributed, be atomized the multiple effects such as good combustion engine waste heat boiler SCR flue gas it is de-
Nitre reducing agent spraying controlling system.
The utility model provides a kind of combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system, the spray
Penetrating control system includes ammonium hydroxide dilution unit, ammonia water spray unit and mixed control unit, and the ammonia water spray unit is arranged in
In the gas approach of waste heat boiler, the ammonium hydroxide dilution unit is connected with ammonia water spray unit by ammonium hydroxide distribution pipeline with will be by
The low concentration ammonium hydroxide that high concentration ammonium hydroxide and dilution water are mixed to get is delivered to ammonia water spray unit and is sprayed, the mixing control
Unit is electrically connected to control the concentration and flow of the flow of high concentration ammonium hydroxide and low concentration ammonium hydroxide with ammonium hydroxide dilution unit.
According to one embodiment of the utility model combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system,
The ammonium hydroxide dilution unit includes high concentration ammonium hydroxide storage subelement, dilution water storage subelement and mixing subelement, the height
Concentration ammonium hydroxide storage subelement is connected by high concentration ammonium hydroxide feed-line with mixing subelement, and the dilution water stores subelement
It is connected by dilution water feed-line with mixing subelement, the mixing subelement passes through ammonium hydroxide distribution pipeline and ammonia water spray list
Member is connected.
According to one embodiment of the utility model combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system,
Ammonium hydroxide filter is disposed with along the flow direction of high concentration ammonium hydroxide on the high concentration ammonium hydroxide feed-line, ammonium hydroxide conveys
Pump, ammonium hydroxide flow control valve and ammonium hydroxide flowmeter are provided on the dilution water feed-line along the flow direction of dilution water
Dilute water filter, dilution water delivery pump, dilution water flow adjustable valve and dilution water flow meter.
According to one embodiment of the utility model combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system,
It is additionally provided between ammonium hydroxide delivery pump and ammonium hydroxide flow control valve on the high concentration ammonium hydroxide feed-line and is stored up with high concentration ammonium hydroxide
Deposit the connected ammonium hydroxide reflux pipeline of subelement, dilution water delivery pump and dilution water flow adjustable valve on the dilution water feed-line
Between be additionally provided with and the dilution water reflux pipeline that is connected of dilution water storage subelement.
According to one embodiment of the utility model combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system,
The ammonia water spray unit includes flexible ammonia water spray gun and common ammonia water spray gun, and the flexibility ammonia water spray gun has bending deflecting function
Can, the flexibility ammonia water spray gun and common ammonia water spray gun are arranged in the gas approach surrounding of waste heat boiler and along flow of flue gas side
To 1~2 layer of arrangement.
According to one embodiment of the utility model combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system,
The mixed control unit includes controlling subelement, the NOx being arranged in the gas approach and exhaust pass of waste heat boiler measurement
Subelement and the flue gas inspection subelement being arranged in the gas approach of waste heat boiler, the NOx measurement subelement and flue gas inspection
Survey subelement be electrically connected with the control subelement, the control subelement also with ammonium hydroxide flow control valve, ammonium hydroxide flowmeter,
Dilution water flow adjustable valve and the electrical connection of dilution water flow meter.
Compared with prior art, the utility model combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system and
Control method by high strength ammonia water consumption, dilution water consumption and ammonium hydroxide dilution after low concentration ammonium hydroxide it is accurate control and
The organic selection and combined application of flexible ammonia water spray gun and common ammonia water spray gun, to ensure that ammonium hydroxide total flow and design conditions are basic
It is consistent the reasonable Arrangement with ammonia water spray gun under gas approach physical condition, the ammonium hydroxide distribution for reaching each branch ammonia water spray gun is equal
The technical goals such as the good result of even, ammonia water spray gun cooling protection and ammonia atomization realize combustion engine waste heat boiler SCR flue gas
Efficient, the safety and stability of denitrating system.
Detailed description of the invention
Fig. 1 is shown to be sprayed according to the combustion engine waste heat boiler SCR denitrating flue gas reducing agent of the utility model exemplary embodiment
Penetrate the structural schematic diagram of control system.
Description of symbols:
1- high concentration ammonium hydroxide stores subelement, 2- high concentration ammonium hydroxide, 21- ammonium hydroxide filter, 22- ammonium hydroxide delivery pump, 23- ammonia
Water flow adjusting valve, 24- ammonium hydroxide flowmeter, 25- ammonium hydroxide reflux pipeline, 3- dilution water storage subelement, 4- dilution water, 41- are dilute
Release water filter, 42- dilution water delivery pump, 43- dilution water flow adjustable valve, 44- dilution water flow meter, the reflux of 45- dilution water
Pipeline, 5- mixing subelement, 6- control subelement, 7- low concentration ammonium hydroxide, 8- ammonium hydroxide distribution pipeline, 9- ammonia water spray unit, 10-
Waste heat boiler, 11- flue gas inspection subelement, 12-NOx measure subelement, 13- denitrating catalyst reaction zone.
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification unless specifically stated can be equivalent or with similar purpose by other
Alternative features are replaced.That is, unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
.
The combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system of the utility model is specifically retouched below
It states and illustrates.
Fig. 1 is shown to be sprayed according to the combustion engine waste heat boiler SCR denitrating flue gas reducing agent of the utility model exemplary embodiment
Penetrate the structural schematic diagram of control system.
As shown in Figure 1, exemplary embodiment according to the present utility model, the combustion engine waste heat boiler SCR denitrating flue gas is also
Former agent jet control system includes ammonium hydroxide dilution unit, ammonia water spray unit and mixed control unit, and ammonium hydroxide dilution unit is used for
Realize that high concentration ammonium hydroxide mixes with the dilution of dilution water and obtain low concentration ammonium hydroxide, ammonia water spray unit is used for waste heat boiler
Low concentration ammonium hydroxide is sprayed into gas approach, mixed control unit adjusts control high concentration according to the flue gas and NOx situation detected
The flow of ammonium hydroxide and the concentration and flow of low concentration ammonium hydroxide.
Wherein, ammonia water spray unit 9 is arranged in the gas approach of waste heat boiler 10, and ammonium hydroxide dilution unit passes through ammonium hydroxide point
It is connected with pipeline 8 with ammonia water spray unit 9 to convey the low concentration ammonium hydroxide 7 being mixed to get by high concentration ammonium hydroxide 2 and dilution water 4
It is sprayed to ammonia water spray unit 9, mixed control unit is electrically connected to control the stream of high concentration ammonium hydroxide 2 with ammonium hydroxide dilution unit
The concentration and flow of amount and low concentration ammonium hydroxide 7.
Specifically, ammonium hydroxide dilution unit includes high concentration ammonium hydroxide storage subelement 1, dilution water storage subelement 3 and mixing
Subelement 5, high concentration ammonium hydroxide store in subelement 1 and store high concentration ammonium hydroxide 2, by high concentration ammonium hydroxide feed-line and mix
Zygote unit 5 is connected；Dilution water storage subelement 3 in store dilution water 4, by dilution water feed-line with mix son singly
Member 5 is connected, and mixing subelement 5 is connected by ammonium hydroxide distribution pipeline 8 with ammonia water spray unit 9.
On high concentration ammonium hydroxide feed-line along the flow direction of high concentration ammonium hydroxide 2 be disposed with ammonium hydroxide filter 21,
Ammonium hydroxide delivery pump 22, ammonium hydroxide flow control valve 23 and ammonium hydroxide flowmeter 24.High concentration ammonium hydroxide stores the high strength ammonia in subelement
Water 2 is mixed with dilution water 4, is diluted being sent by ammonium hydroxide delivery pump 22 into mixing subelement 5 after the filtering of ammonium hydroxide filter 21.
It is additionally provided between ammonium hydroxide delivery pump 22 and ammonium hydroxide flow control valve 23 on high concentration ammonium hydroxide feed-line and is stored up with high concentration ammonium hydroxide
The connected ammonium hydroxide reflux pipeline 25 of subelement 1 is deposited, high concentration is realized in ammonium hydroxide reflux pipeline 25 and the cooperation of ammonium hydroxide flow control valve 23
The adjusting of 2 flow of ammonium hydroxide and the reflux of extra high concentration ammonium hydroxide 2.
Similarly, the flow direction of dilution water 4 is provided with dilution water filter 41, dilution on dilution water feed-line
Water delivery pump 42, dilution water flow adjustable valve 43 and dilution water flow meter 44.Dilution water 4 in dilution water storage subelement 3 exists
It is sent after dilution water filter 41 filters by dilution water delivery pump 42 and is mixed into mixing subelement 5 with high concentration ammonium hydroxide 2, is dilute
It releases, is additionally provided between dilution water delivery pump 42 and dilution water flow adjustable valve 43 on dilution water feed-line and is stored with dilution water
The connected dilution water reflux pipeline 45 of subelement 3, dilution water reflux pipeline 45 and the cooperation of dilution water flow adjustable valve 43 are realized dilute
Release the adjusting of 4 flow of water and the reflux of extra dilution water 4.
The ammonia water spray unit 9 of the utility model includes flexible ammonia water spray gun and common ammonia water spray gun, flexible ammonia water spray gun
Have the function of to be bent deflecting, flexible ammonia water spray gun and common ammonia water spray gun be arranged in the gas approach surrounding of waste heat boiler and along
Flow of flue gas direction arranges 1~2 layer.
According to the fundamental characteristics of combustion engine, original NOx emission is relatively low, and SCR denitrating flue gas ammonia volume is equally lower.If
Meet that combustion engine unit design capacity is small, original NOx concentration discharges low, unit load and exhaust gas volumn is small and high concentration ammonium hydroxide is used for a long time
When, SCR denitrating flue gas ammonia volume then can be smaller.It is negative in unit 100% by taking domestic very large-scale 9F grade combustion engine at present as an example
Under lotus operation, NOx emission is respectively 50mg/Nm before and after denitration3And 10mg/Nm3, (20% is dense for unit SCR denitrating flue gas ammonium hydroxide
Degree ammonium hydroxide) dosage is typically about 230kg/h；If NOx emission is respectively before and after denitration when unit is under 40% load operation
25mg/Nm3And 10mg/Nm3, unit SCR denitration ammonium hydroxide (20% concentration ammonium hydroxide) dosage is typically about 35kg/h.It can be seen that
Become smaller and original NO when encountering unit loadXWhen concentration of emission reduces, ammonia volume can change a lot.
Combustion engine waste heat boiler ammonium hydroxide directly sprays more than SCR gas denitrifying technology injects ammonium hydroxide by several ammonia water spray guns
In heat boiler gas approach, when ammonia volume is too low, the ammonium hydroxide actual flow of every ammonia water spray gun and design rating deviation compared with
More, the ammonium hydroxide that may will affect every ammonia water spray gun is evenly distributed, the cooling protection of ammonia water spray gun and ammonia atomization effect etc..
Also, under the conditions of existing combustion engine HRSG Inlet Duct, the ammonia water spray gun of SCR gas denitrifying technology is directly sprayed ammonium hydroxide
It is very unfavorable to arrange, the utility model has the flexible ammonia water spray gun of bending deflecting function by selecting, and can be effectively shielded from
Existing combustion engine HRSG Inlet Duct arranges the various problems of bring to spray gun；Simultaneously by reasonably with common ammonia water spray gun
It is applied in combination, completely implements ammonia water spray gun in the accurate arrangement of HRSG Inlet Duct surrounding, it is ensured that ammonia water spray gun injection
Point is consistent with actual demand, is evenly distributed in flue condition of having laid a good foundation for ammonium hydroxide.
Also, the jet control system of the utility model can rationally dilute high concentration ammonium hydroxide using dilution water,
It reduces ammonia concn and increases ammonium hydroxide total flow, it is made to coincide substantially with the ammonia volume under design conditions.It can effectively protect
The ammonium hydroxide for demonstrate,proving every ammonia water spray gun is evenly distributed, the cooling protection of ammonia water spray gun and ammonia atomization effect, safeguards unit SCR flue gas
The safe normal table of denitration is run.
According to the utility model, mixed control unit includes the gas approach for controlling subelement 6, waste heat boiler 10 being arranged in
The flue gas inspection subelement for measuring subelement 12 with the NOx in exhaust pass and being arranged in the gas approach of waste heat boiler 10
11.NOx measurement subelement 12 and flue gas inspection subelement 11 are electrically connected with control subelement 6, and thus, it is possible to what be will test
NOx data and Gas Parameters are fed back to control subelement 6；Control subelement 6 also with ammonium hydroxide flow control valve 23, ammonium hydroxide flow
Meter 24, dilution water flow adjustable valve 43 and dilution water flow meter 44 are electrically connected, and thus, it is possible to according to the received NOx data of institute, cigarette
The flow information of gas parameter information and high concentration ammonium hydroxide 2, dilution water 4 controls the flow of high concentration ammonium hydroxide 2 and dilution water 4, into
And control the concentration and flow of low concentration ammonium hydroxide 7.
Combustion engine waste heat boiler SCR is carried out using above-mentioned combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system
When the injection control of denitrating flue gas reducing agent, it may comprise steps of:
Subelement 6 is controlled according to the NOx data and Gas Parameters of the gas approach of the waste heat boiler 10 measured and outlet
The NOx data of flue automatically adjust 2 flow of high concentration ammonium hydroxide in real time, and are automatically adjusted in real time according to 2 flow of high concentration ammonium hydroxide dilute
4 flow of water is released, low concentration ammonium hydroxide 7 is then mixed to get；
Low concentration ammonium hydroxide 7 is distributed to ammonia water spray unit 9 by ammonium hydroxide distribution pipeline 8 and sprays into waste heat pot after being atomized
In the gas approach of furnace 10.
Wherein, the mass concentration of high concentration ammonium hydroxide is 15~30%, and the mass concentration of low concentration ammonium hydroxide is 1~10%, tool
Body is selected and is adjusted according to actual condition.Can also control when by adjusting after extra high concentration ammonium hydroxide and extra dilution water
It returns.
The utility model is described in further detail for jet control system in reference to the accompanying drawing.
High concentration ammonium hydroxide is stored the high concentration ammonium hydroxide 2 in subelement 1 to send by ammonium hydroxide delivery pump 22 to mixing subelement 5
In, 22 entrance of ammonium hydroxide delivery pump is provided with ammonium hydroxide filter 21, the NO measured by NOx measurement subelement 12XData and cigarette
The Gas Parameters that gas detection sub-unit 11 measures feed back to control subelement 6 and calculate the backward ammonium hydroxide flow control valve 23 of result
It issues instruction to be automatically adjusted in real time, 2 dosage of high concentration ammonium hydroxide needed for controlling SCR denitrating flue gas with this, extra is highly concentrated
Degree ammonium hydroxide 2 can be back to high concentration ammonium hydroxide storage subelement 1 through ammonium hydroxide reflux pipeline 25.
Dilution water is stored the dilution water 4 in subelement 3 to send by dilution water delivery pump 42 into mixing subelement 5, In
42 entrance of dilution water delivery pump setting dilution water filter 41,2 flow feedback of high concentration ammonium hydroxide measured by ammonium hydroxide flowmeter 24
Control subelement 6 is given, is carried out after control subelement 6 calculates 4 dosage of dilution water with data measured by dilution water flow meter 44
Then program comparative analysis issues the aperture of instruction automatic adjustment dilution water flow adjustable valve 43 and controls the flow of dilution water 4,
Extra dilution water 4 can be back to dilution water storage subelement 3 through dilution water reflux pipeline 45.
High concentration ammonium hydroxide 2 is diluted water 4 after mixing subelement 5 and is diluted to low concentration ammonium hydroxide 7, and low concentration ammonium hydroxide 7 flows
To each ammonium hydroxide distribution pipeline 8, (by ammonia water spray gun unit under the organic assembling use of flexible ammonia water spray gun and common ammonia water spray gun
9 are reasonably accurately arranged in the gas approach surrounding of waste heat boiler 10), so that low concentration ammonium hydroxide 7 is assigned to each ammonia water spray gun and quilt
It is sprayed into after atomization in the gas approach of waste heat boiler 10, realizes ammonium hydroxide being uniformly distributed in waste heat boiler 10, utilize high temperature cigarette
Gas 11 is vaporized into ammonia, after ammonia and flue gas 11 are sufficiently mixed, reach denitrating catalyst reaction zone 13 and carries out denitration reaction.
To sum up, on the one hand the utility model rationally dilutes ammonium hydroxide using dilution water, reduces ammonia concn and increases
Ammonium hydroxide total flow, makes it coincide substantially with the ammonia volume under design conditions, effectively guarantees the ammonia level of every ammonia water spray gun
Distribution, the cooling protection of ammonia water spray gun and ammonia atomization effect；On the other hand using the flexible ammonia for having bending deflecting function
Water spray gun is effectively shielded from the relevant issues such as HRSG Inlet Duct lower space is narrow, bracket hinders, then passes through flexible ammonia
The reasonable combination of water spray gun and common ammonia water spray gun uses, and completely implements ammonia water spray gun in the accurate cloth of gas approach surrounding
It sets, it is ensured that ammonia water spray gun spray site is consistent with actual demand, is evenly distributed for ammonia water spray and the abundant of ammonia and flue gas mixes
It closes and good basic condition is provided, effectively safeguard the safe normal table operation of unit SCR denitrating flue gas.
The utility model is not limited to specific embodiment above-mentioned.The utility model expands to any in this specification
The new feature of middle disclosure or any new combination, and disclose any new method or process the step of or any new group
It closes.
Claims (6)
1. a kind of combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system, which is characterized in that the injection control system
System includes ammonium hydroxide dilution unit, ammonia water spray unit and mixed control unit, and the ammonia water spray unit is arranged in waste heat boiler
Gas approach in, the ammonium hydroxide dilution unit is connected with ammonia water spray unit by ammonium hydroxide distribution pipeline with will be by high strength ammonia
The low concentration ammonium hydroxide that water and dilution water are mixed to get is delivered to ammonia water spray unit and is sprayed, the mixed control unit and ammonia
Water dilution unit is electrically connected to control the flow of high concentration ammonium hydroxide and the concentration and flow of low concentration ammonium hydroxide.
2. combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system according to claim 1, which is characterized in that
The ammonium hydroxide dilution unit includes high concentration ammonium hydroxide storage subelement, dilution water storage subelement and mixing subelement, the height
Concentration ammonium hydroxide storage subelement is connected by high concentration ammonium hydroxide feed-line with mixing subelement, and the dilution water stores subelement
It is connected by dilution water feed-line with mixing subelement, the mixing subelement passes through ammonium hydroxide distribution pipeline and ammonia water spray list
Member is connected.
3. combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system according to claim 2, which is characterized in that
Ammonium hydroxide filter is disposed with along the flow direction of high concentration ammonium hydroxide on the high concentration ammonium hydroxide feed-line, ammonium hydroxide conveys
Pump, ammonium hydroxide flow control valve and ammonium hydroxide flowmeter are provided on the dilution water feed-line along the flow direction of dilution water
Dilute water filter, dilution water delivery pump, dilution water flow adjustable valve and dilution water flow meter.
4. combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system according to claim 3, which is characterized in that
It is additionally provided between ammonium hydroxide delivery pump and ammonium hydroxide flow control valve on the high concentration ammonium hydroxide feed-line and is stored up with high concentration ammonium hydroxide
Deposit the connected ammonium hydroxide reflux pipeline of subelement, dilution water delivery pump and dilution water flow adjustable valve on the dilution water feed-line
Between be additionally provided with and the dilution water reflux pipeline that is connected of dilution water storage subelement.
5. combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system according to claim 1, which is characterized in that
The ammonia water spray unit includes flexible ammonia water spray gun and common ammonia water spray gun, and the flexibility ammonia water spray gun has bending deflecting function
Can, the flexibility ammonia water spray gun and common ammonia water spray gun are arranged in the gas approach surrounding of waste heat boiler and along flow of flue gas side
To 1~2 layer of arrangement.
6. combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system according to claim 3, which is characterized in that
The mixed control unit includes controlling subelement, the NOx being arranged in the gas approach and exhaust pass of waste heat boiler measurement
Subelement and the flue gas inspection subelement being arranged in the gas approach of waste heat boiler, the NOx measurement subelement and flue gas inspection
Survey subelement be electrically connected with the control subelement, the control subelement also with ammonium hydroxide flow control valve, ammonium hydroxide flowmeter,
Dilution water flow adjustable valve and the electrical connection of dilution water flow meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822149476.8U CN209612637U (en) | 2018-12-20 | 2018-12-20 | Combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822149476.8U CN209612637U (en) | 2018-12-20 | 2018-12-20 | Combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system |
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| Publication Number | Publication Date |
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| CN209612637U true CN209612637U (en) | 2019-11-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109513348A (en) * | 2018-12-20 | 2019-03-26 | 东方电气集团东方锅炉股份有限公司 | Combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system and control method |
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2018
- 2018-12-20 CN CN201822149476.8U patent/CN209612637U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109513348A (en) * | 2018-12-20 | 2019-03-26 | 东方电气集团东方锅炉股份有限公司 | Combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system and control method |
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